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  • 1.
    Aagerup, Ulf
    et al.
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, Centrum för innovations-, entreprenörskaps- och lärandeforskning (CIEL).
    Frank, Anna-Sofia
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap.
    Hultqvist, Evelina
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap.
    The persuasive effects of emotional green packaging claims2019Inngår i: British Food Journal, ISSN 0007-070X, E-ISSN 1758-4108, Vol. 121, nr 12, s. 3233-3246Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Purpose - The purpose of this paper is to investigate the effects of rational green packaging claims vs emotional green packaging claims on consumers' purchase propensity for organic coffee.

    Design/methodology/approach - Three within-subjects experiment were carried out (N=87, N=245, N=60). The experimental design encompasses packaging with rational green claims, emotional green claims, as well as a neutral (control) claim. Measured variables are introduced to assess participants' environmental commitment and information processing ability. A manipulated between-subjects variable is introduced to test how distraction interacts with preference for the claims.

    Findings - Overall, consumers prefer products with green claims over those with neutral (control) claims, and products with emotional green claims to those with rational green claims. The studies also reveal that this effect is moderated by participants' environmental commitment, information processing ability and by distraction. The findings were statistically significant (p<0.05).

    Research limitations/implications - As a lab experiment, the study provides limited generalizability and external validity. Practical implications - For most organic FMCG products, it is advisable to employ emotional packaging claims.

    Social implications - The presented findings provide marketers with tools to influence consumer behavior toward sustainable choices.

    Originality/value - The paper validates previous contributions on the effects of product claim types, and extends them by introducing comprehensive empirical data on all the Elaboration Likelihood Model's criteria for rational decision-making; motivation, opportunity and ability.

  • 2.
    Abbas, Taimoor
    et al.
    Lund Univ, Elect & Informat Technol Dept, S-22100 Lund, Sweden..
    Sjöberg, Katrin
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS), Centrum för forskning om inbyggda system (CERES).
    Kåredal, Johan
    Lund Univ, Elect & Informat Technol Dept, S-22100 Lund, Sweden..
    Tufvesson, Fredrik
    Lund Univ, Elect & Informat Technol Dept, S-22100 Lund, Sweden..
    A Measurement Based Shadow Fading Model for Vehicle-to-Vehicle Network Simulations2015Inngår i: International Journal of Antennas and Propagation, ISSN 1687-5869, E-ISSN 1687-5877, artikkel-id 190607Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The vehicle-to-vehicle (V2V) propagation channel has significant implications on the design and performance of novel communication protocols for vehicular ad hoc networks (VANETs). Extensive research efforts have been made to develop V2V channel models to be implemented in advanced VANET system simulators for performance evaluation. The impact of shadowing caused by other vehicles has, however, largely been neglected in most of the models, as well as in the system simulations. In this paper we present a shadow fading model targeting system simulations based on real measurements performed in urban and highway scenarios. The measurement data is separated into three categories, line-of-sight (LOS), obstructed line-of-sight (OLOS) by vehicles, and non-line-of-sight due to buildings, with the help of video information recorded during the measurements. It is observed that vehicles obstructing the LOS induce an additional average attenuation of about 10 dB in the received signal power. An approach to incorporate the LOS/OLOS model into existing VANET simulators is also provided. Finally, system level VANET simulation results are presented, showing the difference between the LOS/OLOS model and a channel model based on Nakagami-m fading.

  • 3.
    Abboud, Mohamad Moulham
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, Bio- och miljösystemforskning (BLESS), Energivetenskap.
    Simulation of 3ph induction motor in Matlab with VVVF starting method2016Independent thesis Advanced level (degree of Master (One Year)), 40 poäng / 60 hpOppgave
    Abstract [en]

    Nowadays, three-phase induction motors are widely used on industrial and other types of processes. Therefore, accurate knowledge of an induction motor performance is very essential to have an idea of its operation conditions. This study is a sequel of a previous one, where Direct and Soft starting methods of three-phase motors has been simulated and compared. As in the previous study, the theory behind this one is based on representing the real motor by aset of equations and values in Matlab, forming a corresponding idealistic motor in a way where all the physical effects are similar. The motor is started under three different frequencies in the VVVF method using supporting simulation of the current, torque, speed,efficiency and power factor curves. The results of the three starting methods are then discussed and compared.

    Fulltekst (pdf)
    fulltext
  • 4.
    Abd-Aljawad, Baraa
    et al.
    Högskolan i Halmstad, Akademin för hälsa och välfärd.
    Grönberg, Camilla
    Högskolan i Halmstad, Akademin för hälsa och välfärd.
    Vem tar hand om chefen?: En explorativ studie om första linjens- och mellanchefers upplevda organisatoriska och sociala arbetsmiljö.2022Independent thesis Basic level (degree of Bachelor), 10 poäng / 15 hpOppgave
    Abstract [en]

    “Who takes care of the manager?”An exploratory study of manager´s perceived organizational and social work environment. 

    The study aims to create a deeper understanding of managers' experiences, of their organizational and social work environment. Furthermore, the study aims to examine managers' perceptions of health factors that they perceive as health-promoting. The main question of this study is; “How do managers experience their organizational and social work environment?”. As previous research has often focused on preventive factors, this study focuses on a health-promoting perspective. Which refers to the study's second question; "What health factors do managers perceive as health-promoting?". The study applies a qualitative method through semi-structured interviews for the collection of empirical material. The sample consists of eight first-line and middle managers in various industries. The study has an exploratory focus in order to create a basis for further research. 

    The results of the study show that recovery, communication, colleagues, social relationships, clear roles, goals and tasks are perceived as important organizational and social aspects in the manager's own work environment. The results also show that perceived health factors are flexibility in working hours, being heard, support from colleagues, functioning social relationships and recovery by adapting their meetings.  

    Keywords: Organizational and social work environment, management, health factors, health promotion.

    Fulltekst (pdf)
    fulltext
  • 5.
    Abdeljaber, O.
    et al.
    Qatar University, Doha, Qatar.
    Younis, Adel
    Qatar University, Doha, Qatar.
    Alhajyaseen, W.
    Qatar University, Doha, Qatar.
    Analysis of the Trajectories of Left-turning Vehicles at Signalized Intersections2020Inngår i: Transportation Research Procedia, 2020, Vol. 48, s. 1288-1295Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Internationally, an annual number of more than a million fatalities are caused by road traffic crashes, with particularly signalized intersections being crash prone locations within the highway system. An accumulation of conflicts between drivers is caused by the different movements (through and turning) from different directions at the intersection; hence, studying the trajectories of turning vehicles is an important step towards improving traffic safety performance of these facilities. In view of that, the current paper aims at providing further insight into the behaviour of left-turning vehicles (right-hand traffic rule) at signalized intersections in the State of Qatar. At first, a total of 44 trajectories of free-flowing vehicles were manually extracted from a recorded video for a single approach of Lekhwair signalized intersection in Doha City, State of Qatar. After that, the extracted trajectories were statistically analysed in an attempt to explore the factors affecting the path of left-turning vehicles at signalized intersections. The results suggest that the characteristics of the extracted paths are significantly related to the vehicle’s entry speed, minimum speed throughout its turning manoeuvre, and the lateral distance between the exit point and the curb (i.e., targeted exit lane). Provided that the speed parameters can be fairly an indication to the driving behaviour, it can be concluded that the driver’s attitude plays an important role in drawing the manoeuvre of a turning vehicle as does the pre-selection of the exit lane. Finally, the effort presented in this paper can be regarded as a way forward towards understanding the behaviour of turning vehicles at signalised intersection in the State of Qatar.

  • 6.
    Abdeljaber, O.
    et al.
    Linnaeus University, Växjö, Sweden.
    Younis, Adel
    Qatar University, Doha, Qatar.
    Alhajyaseen, W.
    Qatar University, Doha, Qatar.
    Extraction of Vehicle Turning Trajectories at Signalized Intersections Using Convolutional Neural Networks2020Inngår i: The Arabian Journal for Science and Engineering, ISSN 1319-8025, Vol. 45, nr 10, s. 8011-8025Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    This paper aims at developing a convolutional neural network (CNN)-based tool that can automatically detect the left-turning vehicles (right-hand traffic rule) at signalized intersections and extract their trajectories from a recorded video. The proposed tool uses a region-based CNN trained over a limited number of video frames to detect moving vehicles. Kalman filters are then used to track the detected vehicles and extract their trajectories. The proposed tool achieved an acceptable accuracy level when verified against the manually extracted trajectories, with an average error of 16.5 cm. Furthermore, the trajectories extracted using the proposed vehicle tracking method were used to demonstrate the applicability of the minimum-jerk principle to reproduce variations in the vehicles’ paths. The effort presented in this paper can be regarded as a way forward toward maximizing the potential use of deep learning in traffic safety applications.

  • 7.
    Abdeljaber, O.
    et al.
    Qatar University, Doha, Qatar.
    Younis, Adel
    Qatar University, Doha, Qatar.
    Avci, O.
    Qatar University, Doha, Qatar.
    Catbas, N.
    University of Central Florida, FL, United States.
    Gul, M.
    University of Central Florida, FL, United States.
    Celik, O.
    University of Central Florida, FL, United States.
    Zhang, H.
    University of Alberta, Edmonton, AB, Canada.
    Dynamic Testing of a Laboratory Stadium Structure2016Inngår i: Proceedings of the Joint Geotechnical and Structural Engineering Congress 2016, 2016, s. 1719-1728Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Studies with large physical models are a vital link between the theoretical work and field applications provided that these models are designed to represent real structures where various types and levels of uncertainties can be incorporated. While comprehensive analytical and laboratory joint studies are ongoing at Qatar University, University of Central Florida and University of Alberta, this paper presents the initial findings of dynamic testing at Qatar University. A laboratory stadium structure (grandstand simulator) has been constructed at Qatar University. Capable of housing thirty spectators, Qatar University grandstand simulator is arguably the largest laboratory stadium in the world. The structure is designed in a way that several different structural configurations can be tested in laboratory conditions to enable researchers to test newly developed damage detection algorithms. The study presented in this paper covers the finite element modeling and modal testing of the test structure. © ASCE.

  • 8.
    Abdou Mahmoud, Amir
    et al.
    Högskolan i Halmstad, Sektionen för ekonomi och teknik (SET).
    Dahlqvist, Ted
    Högskolan i Halmstad, Sektionen för ekonomi och teknik (SET).
    Ånghuvud för steamer2010Independent thesis Advanced level (degree of Master (Two Years)), 5 poäng / 7,5 hpOppgave
    Abstract [sv]

    Följande examensjobbs rapport bygger på examensjobbskursen i CAD-teknikerprogrammet årskurs två.

     

    Arbetet som rapporten bygger på är utfört i samarbete med Hafa badrum i Halmstad. Arbetet innefattar utvecklingen av ångmunstycke för steamrar, en slags ångdusch som är en blandning av ångbastu samt dusch. Skälet bakom utvecklingen är att passa in ångmunstycket med Hafas övriga design, samt att försöka få så lite överskottsvatten som möjligt.

     

    Det kom fram en gemensam idé att integrera ångmunstycket, under ett möte med Hafa, som sedan spann vidare och blev den första prototypen.

     

    Prototypen visade sig vara lyckad, även om skydd för ångan var tvunget att tillverkas då den kom ut för starkt i duschen, främst då lite spillvatten skapades och för att prototypen endast hade en tredjedel av materialmängden jämfört med den modell Hafa har idag.

     

    Metoden som följdes var den samme som användes av oss i princip-, primär-, och tillverkningskonstruktions kurserna.

    Fulltekst (pdf)
    FULLTEXT01
  • 9.
    Abdul Gabar, Allan
    et al.
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap.
    Protic, Dennis
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap.
    Kartläggning av arbetsledarens arbetsfördelning i byggproduktion: En undersökning av möjliga förbättringar inom yrkesrollen2017Independent thesis Basic level (university diploma), 10 poäng / 15 hpOppgave
    Abstract [en]

    Every company strives for maximum efficiency. The construction industry, which is complex while margins are small, makes efficiency an important issue. In the construction industry today,the high demand for production is to be delivering high quality projects as well as within certain timeframes. In order for this to be achieved, there is a great demand for work management in production. Therefore, we have chosen to analyze improvement areas within the supervisor’s role.The purpose of this report is to investigate the supervisor’s situation in the construction industry.Furthermore, the purpose is to identify work-related tasks in the professional role that have the potential for efficiency enhancement.A frequency study has been conducted in three different workplaces where we have followed three different supervisors for a total of nine days to get an insight into how the supervisors spend theirtime. Interviews have been conducted with supervisors for an even broader view of the study. Literature search has been made where we have found theories that we also present. During the course of the study we have found that there are a few improvement areas. As an enhancement, we think digitalization should be implemented, and everyone should keep order and clean up afterwards, more feedback to employees, and develop communication.

    Fulltekst (pdf)
    fulltext
  • 10.
    Abdulhalim, Mohammed
    et al.
    Högskolan i Halmstad, Sektionen för ekonomi och teknik (SET).
    Angmyr, Sebastian
    Tillämpning av Partnering vid ombyggnad av bostäder: Vad krävs för ett framgångsrikt partnering projekt?2013Independent thesis Basic level (university diploma), 10 poäng / 15 hpOppgave
    Fulltekst (pdf)
    bilaga
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  • 11.
    Abdulrazzak, Shahm
    et al.
    Högskolan i Halmstad, Akademin för informationsteknologi.
    Mattsson, Tor
    Högskolan i Halmstad, Akademin för informationsteknologi.
    Java Auto Grader2023Independent thesis Basic level (degree of Bachelor), 10 poäng / 15 hpOppgave
    Abstract [en]

    The process of grading code submissions in programming courses is time-consuming and error-prone. To address this issue, we propose a project that automates the testing and grading process for Java code submissions at Halmstad University. Our approach leverages property-based testing using the JUnit Quick-Check library to generate tests and test reports automatically.

     

    The tool we demonstrate in this project is designed to provide students with immediate feedback on their code submissions and reduce the workload for instructors. By automatically generating tests and test reports, our approach ensures that code submissions meet the required specifications and are free from common errors. The com.pholser library is utilized to implement the property-based testing approach.

     

    We believe that our project has the potential to improve the grading process for programming courses and provide a more efficient and effective way of assessing student code submissions. Our implementation can be easily extended to support other programming languages and can be integrated with existing learning management systems to provide a seamless experience for instructors and students alike.

    Fulltekst (pdf)
    fulltext
  • 12.
    Abebe, Abay Damte
    et al.
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap.
    He, Qikang
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap.
    Foam Behavior Analysis Based On A Force Measurement System2018Independent thesis Advanced level (degree of Master (One Year)), 10 poäng / 15 hpOppgave
    Abstract [en]

    Abstract

    In the world where every sector of industrial manufacturing is being converted toautomated systems, surface finishing processes like sanding and polishing seem to lag.This phenomenon is not surprising as these processes are complex to optimize. Therehave been projects going on with the support of European Commission to findsolutions under SYMPLEXITY (Symbiotic Human-Robot Solutions for ComplexSurface Finishing Operations). One of the projects in under this include poliMATIC(Automated Polishing for the European Tooling Industry). Halmstad University isinvolved in doing projects.

    This project took a portion of this study in aim to understand a foam material’s behavior used for sanding tool at the tip of a robotic arm. This is studied using a forcemeasurement system developed at Halmstad University. The project has two sectionsand starts with one; Understanding the force measurement system and upgrading innecessary ways. Two; studying how the foam material compressive hardness propertyis affected when the material is fit with sandpaper for sanding operation using theforce measurement system. The study finally revealed how the combination of thefoam with sandpaper affects the robustness of the material, and significantlyimproved the output of the system with by reducing the noise level with 40%.

    Fulltekst (pdf)
    fulltext
  • 13.
    Abella, Jaume
    et al.
    Barcelona Supercomputing Center, Barcelona, Spain.
    Perez, Jon
    Ikerlan Technology Research Centre, Arrasate, Spain.
    Englund, Cristofer
    RISE Research Institutes of Sweden, Gothenburg, Sweden.
    Zonooz, Bahram
    Navinfo Europe, Eindhoven, Netherlands.
    Giordana, Gabriele
    AIKO S.r.l., Torino, Italy.
    Donzella, Carlo
    Exida Development s.r.l.,Colleretto Giacosa, Italy.
    Cazorla, Francisco J.
    Barcelona Supercomputing Center, Barcelona, Spain.
    Mezzetti, Enrico
    Barcelona Supercomputing Center, Barcelona, Spain.
    Serra, Isabel
    Barcelona Supercomputing Center, Barcelona, Spain.
    Brando, Axel
    Barcelona Supercomputing Center, Barcelona, Spain.
    Agirre, Irune
    Ikerlan Technology Research Centre, Arrasate, Spain.
    Eizaguirre, Fernando
    Ikerlan Technology Research Centre, Arrasate, Spain.
    Bui, Thanh Hai
    RISE Research Institutes of Sweden, Lund, Sweden.
    Arani, Elahe
    Navinfo Europe, Eindhoven, Netherlands.
    Sarfraz, Fahad
    Navinfo Europe, Eindhoven, Netherlands.
    Balasubramaniam, Ajay
    Navinfo Europe, Eindhoven, Netherlands.
    Badar, Ahmed
    Navinfo Europe, Eindhoven, Netherlands.
    Bloise, Ilaria
    AIKO S.r.l., Torino, Italy.
    Feruglio, Lorenzo
    AIKO S.r.l., Torino, Italy.
    Cinelli, Ilaria
    AIKO S.r.l., Torino, Italy.
    Brighenti, Davide
    Exida Engineering S.r.l., Rovereto, Italy.
    Cunial, Davide
    Exida Engineering S.r.l., Rovereto, Italy.
    SAFEXPLAIN: Safe and Explainable Critical Embedded Systems Based on AI2023Inngår i: DATE 23: Design, Automation And Test In Europe: The European Event For Electronic System Design & Test, 2023, s. 1-6Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Deep Learning (DL) techniques are at the heart of most future advanced software functions in Critical Autonomous AI-based Systems (CAIS), where they also represent a major competitive factor. Hence, the economic success of CAIS industries (e.g., automotive, space, railway) depends on their ability to design, implement, qualify, and certify DL-based software products under bounded effort/cost. However, there is a fundamental gap between Functional Safety (FUSA) requirements on CAIS and the nature of DL solutions. This gap stems from the development process of DL libraries and affects high-level safety concepts such as (1) explainability and traceability, (2) suitability for varying safety requirements, (3) FUSA-compliant implementations, and (4) real-time constraints. As a matter of fact, the data-dependent and stochastic nature of DL algorithms clashes with current FUSA practice, which instead builds on deterministic, verifiable, and pass/fail test-based software. The SAFEXPLAIN project tackles these challenges and targets by providing a flexible approach to allow the certification - hence adoption - of DL-based solutions in CAIS building on: (1) DL solutions that provide end-to-end traceability, with specific approaches to explain whether predictions can be trusted and strategies to reach (and prove) correct operation, in accordance to certification standards; (2) alternative and increasingly sophisticated design safety patterns for DL with varying criticality and fault tolerance requirements; (3) DL library implementations that adhere to safety requirements; and (4) computing platform configurations, to regain determinism, and probabilistic timing analyses, to handle the remaining non-determinism. © 2023 EDAA.

  • 14.
    Abika, Collins
    Högskolan i Halmstad, Akademin för informationsteknologi.
    Complaint system for Health Care Center Hjärtat2022Independent thesis Basic level (degree of Bachelor), 10 poäng / 15 hpOppgave
    Abstract [en]

    Today the IT support could be overwhelmed with loads of requests from the clients within the Health care center Hjärtat (Also known as HCCH) through email, which is an inefficient way to store and manage information of each complaint. Tracking down the list of requests is also an issue. For the goals to ensure the achievements of expanding to new clients, IT support needs a better alternative way to manage, store, and retrieve information. This thesis reports a prototype of a complaint management system implemented for the Healthcare center Helsingborg Hjärtat. The software architect pattern in this project is Model view control and applied on the Visual studio .Net core with the programming language of C-sharp and HTML. Test results showcase the prototype of the complaint management system as an administrator, and the result of the system handles the complaint cases well. The IT support experience keeps track of the complaints more efficiently sent from the client users.

    Fulltekst (pdf)
    fulltext
  • 15.
    Abo Warda, Jamal
    Högskolan i Halmstad, Akademin för företagande, innovation och hållbarhet.
    Can batteries be useful in industrialelectricity systems?2022Independent thesis Advanced level (degree of Master (Two Years)), 20 poäng / 30 hpOppgave
    Abstract [en]

    This study provides an analysis of the benefits of adding solar PV and batteries to industries, both examing the grid-connected and off-grid cases.The electricity demand of 28 companies in Falkenberg, Sweden, whose industries require high voltages for electricity, were studied. We examined the extent to which these companies can depend on energy generated from photovoltaic cells and stored in batteries, as well as the impact of peak loads and the possibility of eliminating peaks when operating off-grid.The data for each of these cases were analyzed for companies to determine the energy that can be generated from photovoltaic cells on-site, and then take advantage of this energy directly and store the surplus in batteries to reduce dependence on the grid or reduce this dependence to a minimum, and study the role of the battery. We obtained interesting results and reliable systems during this study, as we noticed the effect of changing working hours in these companies in proportion to the times of energy production during the period of daily solar radiation.By studying the main load models in these companies and using the results and data analysis, it was noted that batteries can be a reliable solution, in which the energy generated from solar cells is used directly and the excess electricity is stored in the batteries later, and we noted the possibility of operating the entire system off-grid, which was found realistic if the company would have been located in Egypt. .

    Fulltekst (pdf)
    fulltext
  • 16.
    Aboelwafa, Mariam M. N.
    et al.
    Electronics and Communications Engineering Department, American University in Cairo, New Cairo, Egypt.
    Seddik, Karim G.
    Electronics and Communications Engineering Department, American University in Cairo, New Cairo, Egypt.
    Eldefrawy, Mohamed Hamdy
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS), Centrum för forskning om inbyggda system (CERES).
    Gadallah, Yasser
    Electronics and Communications Engineering Department, American University in Cairo, New Cairo, Egypt.
    Gidlund, Mikael
    Department of Information Systems and Technology, Mid Sweden University, Sundsvall, Sweden.
    A Machine-Learning-Based Technique for False Data Injection Attacks Detection in Industrial IoT2020Inngår i: IEEE Internet of Things Journal, ISSN 2327-4662, Vol. 7, nr 9, s. 8462-8471Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The accelerated move toward the adoption of the Industrial Internet-of-Things (IIoT) paradigm has resulted in numerous shortcomings as far as security is concerned. One of the IIoT affecting critical security threats is what is termed as the false data injection (FDI) attack. The FDI attacks aim to mislead the industrial platforms by falsifying their sensor measurements. FDI attacks have successfully overcome the classical threat detection approaches. In this article, we present a novel method of FDI attack detection using autoencoders (AEs). We exploit the sensor data correlation in time and space, which in turn can help identify the falsified data. Moreover, the falsified data are cleaned using the denoising AEs (DAEs). Performance evaluation proves the success of our technique in detecting FDI attacks. It also significantly outperforms a support vector machine (SVM)-based approach used for the same purpose. The DAE data cleaning algorithm is also shown to be very effective in recovering clean data from corrupted (attacked) data. © 2014 IEEE.

  • 17.
    Abrahamsson, Henrik
    et al.
    Högskolan i Halmstad, Sektionen för ekonomi och teknik (SET).
    Nilsson, Anders
    Högskolan i Halmstad, Sektionen för ekonomi och teknik (SET).
    Meetia: Framtiden för utbyte av digital information2010Independent thesis Basic level (university diploma), 15 poäng / 22,5 hpOppgave
    Abstract [sv]

    I dagens affärssamhälle är utbytet av vanliga visitkort i papper enormt. Det är utan tvekan det ledande sättet för människor som träffas första gången att utbyta information i en affärsrelation. Det finns brister gällande uppföljning och hantering av vanliga visitkort och projektgruppen började då fundera på alternativ till pappersvisitkorten.

    I dagens samhälle flyttas alltmer teknik till mobiltelefoner. En mobiltelefon kan idag användas till allt från att göra bankärenden till att läsa tidningen på nätet, vilket för 15 år sedan skulle låta helt orimligt. Det dyker dagligen upp nya mobilapplikationer som ska underlätta och effektivisera vardagen på något sätt och marknaden är enorm. På denna snabbt växande marknad har projektgruppen valt att ta fram ett koncept som de kallar Meetia.

    Meetia är i huvudsak en mobilapplikation framtagen för att trådlöst utbyta digitala visitkort och förenkla bokning av möten genom att synka användarnas kalendrar. Applikationen har även funktioner som låter användaren enkelt och snabbt skapa nya visitkort direkt i telefonen.

    Projektgruppen har även tagit fram en kompletterande hemsida till mobilapplikationen där användare har möjlighet att lagra och hantera de digitala visitkort som mottagits, för att sedan genom smarta sökfunktioner enkelt hitta de visitkort man söker.

    Meetia kommer vara ett optimalt verktyg för att skapa nya kontakter då hela vägen från första kontakt till möte eller lagring av visitkort enkelt sköts med konceptet Meetia. Meetia kommer framför allt inrikta sig mot mässor där visitkort är vanligt förekommande och mängder affärskontakter skapas. För att nå ut till de stora mässorna i Sverige kommer applikationen finnas med mässfunktioner.

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  • 18.
    Abrahamsson, Mickael
    et al.
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap.
    Berg, Simon
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap.
    Tillfälliga modulhus - en ekonomisk och kvalitetsmässig analys2016Independent thesis Basic level (university diploma), 10 poäng / 15 hpOppgave
    Abstract [en]

    The populations of Sweden are right now facing an acute housing shortage. One of the reasons of this is the huge amount of immigrants that have been taken in over recent years. The construction industry hasn’t been able to keep up with the rising demand and is right now looking for a solution. Modular housing is one solution that has been proposed by Boverket, the national board of housing, building and planning as it reduces construction times. The purpose of this paper is to analyze this method and the potential consequences/gains it has. In this paper we have used three different case studies were we have done 3 interviews in each.   This research concludes that the problem doesn’t lie within the quality or the costs associated with modular housing. It lies within the temporary building permits that are often used when time is of the essence. 

    Fulltekst (pdf)
    fulltext
  • 19.
    Abrahamsson, Victoria
    et al.
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap.
    Eckerberg, Christopher
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap.
    Insourcad polsk arbetskraft i svensk byggindustri: En studie utifrån NCCs arbetslednings perspektiv2018Independent thesis Basic level (university diploma), 12 hpOppgave
    Abstract [en]

    The need for labor in the construction sector is today greater than the supply. As a result, several companies use foreign labor, which constitutes challenges. Previous studies highlight that problems can arise mainly in the categories of cultural differences, communication, security, quality and time.

    The purpose of this study is to investigate issues of foreign labor from the perspective of managers. Furthermore, the study aims to highlight positive effects with insourcing, a difference to previous research where the workforce has been external.

    The study is conducted through qualitative methodology where review of existing literature has highlighted apparent issues to handle. In addition, semistructured interviews where conducted with the case company management team to investigate experienced issues as well as the impact of the insourcing strategy. The analysis and discussion of the interviews results in a list of improvement suggestions for companies using foreign labor. A general conclusion is that insourcing is beneficial to construction companies using foreign labor, as it provides continuity and improved opportunity for development and guidance. Furthermore, the education and development of the workers is easier to follow up.

    Fulltekst (pdf)
    fulltext
  • 20.
    Abrams, Philip
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap.
    Simulering och känslighetsanalys av ett pumpkraft-dagvattendammsystem: En utvärdering av potential för småskalig energilagring av solelsöverskott eller arbitrage2020Independent thesis Basic level (university diploma), 10 poäng / 15 hpOppgave
    Abstract [en]

    The global move to more sustainable and renewable energy sources causes increased fluctuations in theelectric market. That fact combined with the Swedish regulations on micro producers make high levels ofself-use critical and have increased the interest in energy storage of energy from intermittent sources.Cooperation with Eksta AB have provided the opportunity to evaluate an innovative energy storage conceptfor a future exploitation area of around 17,2 hectares planned residential and urban area. This bachelorthesis studies the potential of using stormwater management ponds for small-scale energy storage in theform of pumped hydro energy storage (PHES). The focus is on storage of surplus energy from a solarenergy system designed for micro production and local energy supply. However, it also evaluates thepotential of using the equivalent dimensions for energy storage which storage level only change whenbuying or selling electricity at market prices for arbitrage purposes.Potential in the form of financial benefit and increased self-use of solar energy are studied through aquantitative methodology that, in the case of storing surplus energy from a solar system, use a simulationmodel developed for this thesis that takes Eksta´s contractual electric specifications into account. Toevaluate the case of energy storage for arbitrage a simulation model is used in the form of an algorithmbaseddrive strategy named “Optimal”, which has been recreated from research in the field of energy storageand drive strategies. The level of innovation is high on account of including such as energy additions to thestorage from rain water management, energy losses from dispersion of stored stormwater to surroundingground layers, it´s novel focus on a stormwater pond for energy storage, the rarely studied combination ofPHES and small scale solar systems and finally that the dimensions of the pump and turbine that is neededin PHES is based on PaT (pump as turbine) technology, allowing the reverse drive of a centrifugal pumpto operate as a turbine.Sensitivity analysis is included to increase the understanding of PHES-stormwater systems in the case of Eksta and as a concept for energy storage. The work also includes a brief examination of relevant regulationsin order to supply a wider perspective.The result shows that the implementation of a PHES-stormwater system during the years 2018 and 2019increased the self-use of generated solar energy by 28,59 % and provide the joint financial benefit of 5989SEK. The simulation model of energy storage for arbitrage during the years 2018 and 2019 resulted in thecombined financial benefit of 699 SEK when “Optimal” operation strategy is used and 678 SEK with apractically applicable operation strategy.The main conclusion is that PHES-stormwater systems as an energy storage for small-scale solar surplushas high potential to increase the self-use of solar energy but relatively low potential to increase the financialbenefits of small-scale solar systems. From the sensitivity analysis it can be concluded that the simulatedPHES-stormwater system is sensitive to small and medium ranged changes in storage capacity, efficiency,rate of dispersion, set electrical buying price and selectivity of which hours to empty the storage. This whilebeing generally insensitive to small and medium ranged variations in installed peak effect of the solar system,filling/emptying time and the relative size of the turbine compared to the pump.The conclusion from the simulation of arbitrage application is that the potential for financial benefit inthese circumstances is extremely low. The sensitivity analysis lead to the conclusion that the system issensitive to small and medium ranged variations in storage capacity, efficiency, filling/emptying time andmarginal operation costs.Besides the limited financial benefit, other potential hindrances may be the legality of connecting the systemelectrically, lack of financial benefits given to larger but still small-scale solar systems and the eventuality ofdisrupting the main function of the stormwater pond, which is purifying stormwater.

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  • 21.
    Abramson, Norman
    et al.
    Department of Electrical Engineering, University of Hawaii, USA.
    Sacchi, Claudio
    Information Engineering and Computer Science Department, University of Trento, Italy.
    Bellalta, Boris
    Department of Information and Communication Technologies, Universitat Pompeu Fabra, Spain.
    Vinel, Alexey
    Saint-Petersburg Institute for Informatics and Automation, Russian Academy of Sciences, Russia.
    Multiple access communications in future-generation wireless networks2012Inngår i: EURASIP Journal on Wireless Communications and Networking, ISSN 1687-1472, E-ISSN 1687-1499, s. Art nr 45-Artikkel i tidsskrift (Fagfellevurdert)
  • 22.
    Abuawad, Ismail
    Högskolan i Halmstad, Akademin för informationsteknologi.
    Precision i Rörelse: Horisontell Hoppmätning med IMU och Magnetometer2024Independent thesis Basic level (university diploma), 180 hpOppgave
    Abstract [sv]

    Detta examensarbete har genomförts med syftet att utveckla Inno-x företagets system, som är avsett för vardagsidrottare för att mäta neuromuskulära aktiviteter i underkroppen med hjälp av modern teknologi. Systemet omfattar en tröghetsmätningsenhet (IMU) med accelerometer, gyroskop och en EMG-sensor (elektromyografi). Denna konfiguration möjliggör noggrann övervakning av neuromuskulära aktiviteter genom analys av svar på träning. Studiens mål var att identifiera en effektiv sensor för mätning av horisontella hoppavstånd och att utveckla en algoritm som sedan ska integreras i företagets produkt.

    Produkten kommer att använda magnetometer och IMU för att tolka mänskliga rörelser och för att förbättra noggrannheten i företagets mätningssystem. Processen inkluderar förbättring av mätningarnas noggrannhet, integration av teknik med biomekaniska principer, utvärdering av kalibreringstekniker för magnetometeravläsningar, kombination av sensorer för rörelseanalys och genomförande av utvärdering med olika åldersgrupper som består av 10 deltagare för att bedöma systemets effektivitet.

    Även om ingen av metoderna helt uppnådde den önskade noggrannheten inom ±5 cm, visade alla metoder god prestanda för olika tillämpningar. Detta antyder att implementeringen av en kalibrerad magnetometer potentiellt kan förbättra systemets noggrannhet vid bestämning av horisontella hoppavstånd, dock endast med en liten marginal, eftersom studien visade att med kalibrerade magnetometer RMSE (Root Mean Square Error) ökat med 0.99 cm.

    Ytterligare forskning rekommenderas för att undersöka nya sätt att kalibrera sensorer och integrera dem för mer precisa avläsningar. Dock bör det beaktas att magnetometeravläsningar påverkas av miljöfaktorer. Dessutom är det viktigt att skapa ett användarvänligt gränssnitt som gör det möjligt för idrottare att enkelt spåra och analysera sina prestandadata.

    Fulltekst (pdf)
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  • 23.
    Abuella, Mohamed
    et al.
    Högskolan i Halmstad, Akademin för informationsteknologi, Centrum för forskning om tillämpade intelligenta system (CAISR).
    Atoui, M. Amine
    Högskolan i Halmstad, Akademin för informationsteknologi, Centrum för forskning om tillämpade intelligenta system (CAISR).
    Nowaczyk, Sławomir
    Högskolan i Halmstad, Akademin för informationsteknologi, Centrum för forskning om tillämpade intelligenta system (CAISR).
    Johansson, Simon
    CetaSol AB, Gothenburg, Sweden.
    Faghani, Ethan
    CetaSol AB, Gothenburg, Sweden.
    Data-Driven Explainable Artificial Intelligence for Energy Efficiency in Short-Sea Shipping2023Inngår i: Machine Learning and Knowledge Discovery in Databases: Applied Data Science and Demo Track: European Conference, ECML PKDD 2023, Turin, Italy, September 18–22, 2023, Proceedings, Part VII / [ed] Gianmarco De Francisci Morales; Claudia Perlich; Natali Ruchansky; Nicolas Kourtellis; Elena Baralis; Francesco Bonchi, Cham: Springer, 2023, Vol. 14175, s. 226-241Konferansepaper (Fagfellevurdert)
    Abstract [en]

    The maritime industry is under pressure to increase energy efficiency for climate change mitigation. Navigational data, combining vessel operational and environmental measurements from onboard instruments and external sources, are critical for achieving this goal. Short-sea shipping presents a unique challenge due to the significant influence of surrounding landscape characteristics. With high-resolution onboard data increasingly accessible through IoT devices, appropriate data representations and AI/ML analytical tools are needed for effective decision support. The aim of this study is to investigate the fuel consumption estimation model’s role in developing an energy efficiency decision support tool. ML models that lacking explainability may neglect important factors and essential constraints, such as the need to meet arrival time requirements. Onboard weather measurements are compared to external forecasts, and our findings demonstrate the necessity of eXplainable Artificial Intelligence (XAI) techniques for effective decision support. Real-world data from a short-sea passenger vessel in southern Sweden, consisting of 1754 voyages over 15 months (More of data description and code sources of this study can be found in the GitHub repository at https://github.com/MohamedAbuella/ST4EESSS), are used to support our conclusions.  © 2023, The Author(s), under exclusive license to Springer Nature Switzerland AG.

  • 24.
    Achampong, Davis
    et al.
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap.
    Eriksson, John
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap.
    Purus Velox: En mekanisk städmaskin2015Independent thesis Basic level (university diploma), 10 poäng / 15 hpOppgave
    Abstract [sv]

    En av park- och gatuarbetarnas många verktyg, är den traditionella sopkvasten.

    Sopkvasten används för att städa upp ytor där maskiner inte kommer åt, såsom;

    under bänkar, i hörn och mindre områden. Vid användning av en traditionell

    sopkvast innefattar rörelsen rotation och framåtlutning av kroppsställningen, som

    kan om den utförs under en längre tidsperiod leda till muskuloskeletala besvär och

    ha negativa effekter på hälsan. Detta projekt syftar till att utveckla ett nytt

    rengöringsverktyg för att minska framåtlutad, roterad kroppsställning.

    Denna avhandling har använt en produktutvecklingsmetodik och en biomekanisk

    analys för att uppfylla en faktabas för att nå målet. Översyn av litteratur,

    biomekanisk analys och benchmarking användes för att ställa in

    kravspecifikationer för detta projekt. Projektet tillämpade David G Ullman iterativ

    produktutvecklingsmetodik, inklusive brainstorming, Quality Function

    Deployment, Morfologi, Pugh's matris och Failure Mode Effects Analysis. Vidare

    har en fungerande prototyp byggts som ett sista steg i utvecklingsfasen.

    Utvärdering av prototypen i jämförelse med den traditionella sopkvasten, utfördes

    med hjälp av 3D rörelseanalys (Qualisys motion capture-system) och ytelektromyografi

    (Mega 8-kanalsystem) på en testperson.

    Projektet resulterade i en fysiskt fungerande prototyp som kan användas till

    liknande uppgifter som en traditionell sopkvast. Prototypen påtvingar användaren

    att skjuta rengöringsverktyget framför kroppen med en symmetrisk kroppställning

    i alla tre planen. Jämförelsen mellan en traditionell sopkvast och prototypen

    visade en minskning i muskelaktivitet vid användning av prototypen. Dessutom

    visade rörelseanalysen att arbetsställningen var mindre framåtlutad och roterad i

    ryggen. Vidare kunde testpersonen hålla neutrala vinklar i axlar och handleder

    under hela utförandet av uppgiften. Märk väl att de biomekaniska analyserna

    enbart gjorts på en deltagare vilket inte är tillräckligt för att konstatera att

    prototypen bidrar till en mer hälsosam arbetsställning.

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  • 25.
    Ackermann, Max
    et al.
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap.
    Håkansson, Kevin
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap.
    Den generativa dämparen2020Independent thesis Basic level (university diploma), 15 poäng / 22,5 hpOppgave
    Abstract [en]

    It becomes more common with hybrid and electric vehicles around the world and in Sweden. These cars are becoming more and more effective with new sources of regenerative power such as the engine break. This prolongs the cars range which is making electric vehicles more and more competitive. So what is the next step when it comes to reusage of already used electricity? Is there more electric energy that we can reuse to help power the car? Each car has four dampers that absorbs momentum and converts it to thermal energy so that they can dampen its spring. If instead this movement would be turned into elektricenergy it could be stored to the battery or used by the car directly, just like the electric energy generated from the engine brake. The cars would be even more effective and get an even longer range. “Den generativa dämparen” will take advantage of this energy so it won’t go to waste. “Den generative dämparen” will dampen the springs momentum with induction charging. If this implementation succeeds in hybrid and electric cars big savings can be made. It’s estimated that Sweden, with this damper, can save 170 GWh each year in 2030.

    Fulltekst (pdf)
    fulltext
  • 26.
    Ackermann, Max
    et al.
    Högskolan i Halmstad, Akademin för företagande, innovation och hållbarhet.
    Åkesson, Jesper
    Högskolan i Halmstad, Akademin för företagande, innovation och hållbarhet.
    Business models for charging point operators in heavy battery electric vehicles market:: A technological innovation system (TIS) case study in South Sweden2022Independent thesis Advanced level (degree of Master (Two Years)), 20 poäng / 30 hpOppgave
    Abstract [en]

    This thesis combines technological innovation systems with business models in a qualitative case study regarding charging point operators for heavy battery electric vehicles in south Sweden. The heavy battery electric vehicle market is still in early development in Sweden, and the development of public charging stations for heavy battery electric vehicles is low. The case study is developed from several qualitative interviews with relevant actors regarding the system for heavy battery electric vehicle charging stations. The case study delivers an empirical understanding of the heavy battery electric vehicles market system in south Sweden through a technological innovation system, as well as developing the technological innovation system literature to give regulatory and direct recommendations to the actor in focus. These recommendations were based on barriers for charging point operator business models, where the recommendations to charging point operators are on components to business models that can mitigate these barriers. The regulatory recommendations provided are more traditional to the technological innovation system literature. The combination of the technological innovation system and business model literature has also provided the ability to give a more in-depth analysis of business models for actors in new emerging markets. 

    Fulltekst (pdf)
    fulltext
  • 27.
    Adbro, Ted
    Högskolan i Halmstad, Akademin för företagande, innovation och hållbarhet.
    Minskade energiförluster med avseende på tegelyttervägg: Metoder för att minska energikostnaderna för uppvärmning hos äldre hus2021Independent thesis Basic level (professional degree), 10 poäng / 15 hpOppgave
    Abstract [sv]

    Många äldre hus byggdes tidigt på 1900-talet och används som permanent hem idag. Dessahus byggdes med ett dåligt isolerat klimatskal och med dålig isoleringsförmåga hos fönsterna.Alternativet att isolera klimatskalet med mineralull kom först på 50-talet. Fortfarande har endel hus dålig förmåga att hålla kvar värmen i huset samtidigt som bostaden kan ha ettenergikrävande värmesystem. Detta leder i sin tur till stora kostnader i energiförbrukning.Elanvändningen idag är större än någonsin och i genomsnitt går mer än hälften avenergiförbrukningen i hemmet till uppvärmning av bostaden. Energikravet på nybyggda husär mer strikt än tidigare och äldre hus är inte alls lika energisnåla. Möjligheten finns att görade äldre husen effektivare, något som husägaren senare tjänar på att genomföra. I detta arbetegranskas metoder som minskar energiförbrukning från ytterväggens genomsläpp av värme.Detta granskas på en villa med dålig isoleringsförmåga i ytterväggar och fönster samt ettenergikrävande värmesystem. Syftet är att ta redo på vilken av metoderna mellanbergvärmepump, fönsterbyte och tilläggsisolering som ger minst kostnad i energiförlust samthögst besparing och snabbast återbetalningstid på investeringen. Tilläggsisoleringen ochfönsterbyte kommer beräknas separat och tillsammans, vid dessa metoder är värmesystemetelpanna som är husets ursprungliga. Elpannan räknas med 100% i verkningsgrad ochförbrukar samma mängd el som den tillför i värme. För beräkningar hos bergvärmepump harvärmepump en stor värmefaktor, men ytterväggen kommer vara oförändrad och medursprungliga fönster. Värmefaktorn avgör hur mycket mer energi värmepumpen producerar ijämförelse med vad den förbrukar. Den oförändrade ytterväggen består av tegel med dåligisoleringsförmåga samt gamla fönster med dålig isoleringsförmåga. Tilläggsisolering är enkomplicerad process och kan ge väggen konsekvenser samtidigt som fönsterbyte är dyrt ochinte täcker särskilt stor del av husets klimatskal. Ytterväggen är som helhet i stort behov avförändring men trots detta ger bergvärmepumpen med dess stora förmåga att producera energibäst resultat.

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  • 28.
    Adekolu, Adekunle Matthew
    et al.
    Högskolan i Halmstad, Akademin för informationsteknologi.
    Chen, Lei
    Högskolan i Halmstad, Akademin för informationsteknologi.
    A Simple Approach to Develop a Parental Control via a Monitoring Home Network2019Independent thesis Basic level (degree of Bachelor), 10 poäng / 15 hpOppgave
    Abstract [en]

    This thesis explains how a simple parental control can be developed. The system aims to limit kids’ activities rather than entirely restrict those activities. However, current solutions are applying some filtering methods that prevent kids from playing games. In order to overcome this issue, this thesis presents a simple approach to implement a cost-effective parental control using low-cost hardware devices and open source applications.The main advantage of the suggested method is that it can be used without installing any additional software and gives parents general information about their kids' activities on the internet without preventing kids from playing online games.

    Fulltekst (pdf)
    fulltext
  • 29.
    Adekolu, Adekunle Matthew
    et al.
    Högskolan i Halmstad, Sektionen för Informationsvetenskap, Data– och Elektroteknik (IDE).
    Khan, Hasan
    Högskolan i Halmstad, Sektionen för Informationsvetenskap, Data– och Elektroteknik (IDE).
    Neelam, Neelam
    Högskolan i Halmstad, Sektionen för Informationsvetenskap, Data– och Elektroteknik (IDE).
    Network Monitoring2014Independent thesis Basic level (university diploma), 5 poäng / 7,5 hpOppgave
    Abstract [en]

    Managing a network is a very big functional area along with performance, devicemaintenance, security, performance, monitoring, troubleshooting, plan of changeand etc. Among all of these monitoring plays a vital role. It can cover a wide area ofnetwork management. Monitoring is the only way to find out whether the networkis functioning according to plan. In order to know what is happening in a network,how its functioning at any given time, a network should have a logging system. Nowa day this logging activity is done by Network monitoring tool. It lets user know thestatus of the network at any given time. This logging can give the user a wide viewwhat can't be seen in general. For example the statistics of a week or month, even ayear. Monitoring is a very important issue in an organization network which aroseover the time.In this project we are going to implement some well known network monitoringtools in a real world scenario and we will investigate how this monitoring tool canhelp network administrators to monitor a network . Moreover, what kind ofinformation we can extract from a network by these tools.The purpose of this project is to get an overall idea about the importance of networkmonitoring and what are the facts need to be considered while monitoring anetwork. There are lots of pros and cons in monitoring a network. So choosing theappropriate tool for monitoring is very important. Monitoring a network with theleast effects on network performance is the best solution in case of monitoring.The outcome from these monitoring tools is a wide range of useful data andintegration of these data produces the status of the network at any give time.Moreover these data will be logged to create a statistical report. Different users suchas a network admin and organization can use this information from differentperspectives to make a network more efficient for users.

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  • 30.
    Adiego Abad, Sonia
    Högskolan i Halmstad, Sektionen för ekonomi och teknik (SET).
    Degree project:HOSTEL2011Independent thesis Basic level (degree of Bachelor), 10 poäng / 15 hpOppgave
    Abstract [en]

    A construction project including planning, cost estimation and design of a Hostel on a property in the city of Halmstad.

  • 31.
    Adiyodi Madhavan, Resmi
    et al.
    Högskolan i Halmstad, Akademin för informationsteknologi.
    Sajan, Ann Zenna
    Högskolan i Halmstad, Akademin för informationsteknologi.
    Malicious Activity Detection in Encrypted Network Traffic using A Fully Homomorphic Encryption Method2022Independent thesis Advanced level (degree of Master (One Year)), 10 poäng / 15 hpOppgave
    Abstract [en]

    Everyone is in need for their own privacy and data protection, since encryption transmission was becoming common. Fully Homomorphic Encryption (FHE) has received increased attention because of its capability to execute calculations over the encoded domain. Through using FHE approach, model training can be properly outsourced. The goal of FHE is to enable computations on encrypted files without decoding aside from the end outcome. The CKKS scheme is used in FHE.Network threats are serious danger to credential information, which enable an unauthorised user to extract important and sensitive data by evaluating the information of computations done on raw data. Thus the study provided an efficient solution to the problem of privacy protection in data-driven applications using Machine Learning. The study used an encrypted NSL KDD dataset. Machine learning-based techniques have emerged as a significant trend for detecting malicious attack. Thus, Random Forest (RF) is proposed for the detection of malicious attacks on Homomorphic encrypted data in the cloud server. Logistic Regression (LR) machine learning model is used to predict encrypted data on cloud server. Regardless of the distributed setting, the technique may retain the accuracy and integrity of the previous methods to obtain the final results.

    Fulltekst (pdf)
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  • 32.
    Adnan Abdu, Jihad
    et al.
    Högskolan i Halmstad, Akademin för informationsteknologi.
    Lundström, Philip
    Högskolan i Halmstad, Akademin för informationsteknologi.
    Water Quality Device: Testing Through Electronic Measurements2023Independent thesis Basic level (degree of Bachelor), 10 poäng / 15 hpOppgave
    Abstract [en]

    Water is the source of all life, but unfortunately, the water quality is getting only worse due to many factors like overuse, contamination, indifference and even by nature itself. By identifying the problem, we are one step closer to solving the problem, and that is why an intelligent water quality device is required to examine water and detect impurities within it. In this project, we are developing a device that uses an entirely new method to measure water quality. Even though the theory behind the device is very advanced, the device is still primitive in its functions and needs development to increase the usefulness and accuracy of the measurements!

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  • 33.
    Adolfsson, Matilda
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap.
    Vibrationer och engesvängningar i Alfdex separator2019Independent thesis Basic level (university diploma), 10 poäng / 15 hpOppgave
    Abstract [en]

    The purpose of this thesis is to create a greater understanding of what happens inAlfdex’s separator in terms of natural frequencies, also called resonances. Try in asystematic way to find out where the problem is and produce a possible solutionto the problem. To achieve this smoothly, vibration measurements were made onthree different models with two variants, a total of six different variants. Themeasurements made with an electric shaker were set to run a sweep of 2-500Hz,which means that it increases the frequency from 20-500Hz with a constantacceleration of 2G. The measurement was first made on these six variants and, onthe basis of the results, it has been possible to compare with the modificationsmade.As the first modification, the disks in the separator were glued together to see ifthey made any difference from the previous result. As the next test spacers wereprinted out of the 3D-printer, that would replace the existing springs in theseparator, to aww what happens if we do not have any springs. There was also atest where the top of the separator the so-called house, was cut into a larger holeso as to see how the disks hold a constant amplitude relative to each other, whichmeans that the disks are not exposed to any natural frequencies. The springs werefilmed to see how they act and move, where it is clear that there are naturalfrequencies in the springs.Based on these tests, it can be concluded that the disk in question are not aproblem. The problem instead has its foundation in the springs that carry the diskstack throughout the separator, resonances in these give a great influence in theentire contents of the separator.

    Fulltekst (pdf)
    fulltext
  • 34.
    Ads, Khaled
    Högskolan i Halmstad, Akademin för informationsteknologi.
    Field uniformity and isotropy investigation of Halmstad University's reverberation chamber: In collaboration with Halmstad University and Ericsson AB, Lund2020Independent thesis Advanced level (degree of Master (One Year)), 10 poäng / 15 hpOppgave
    Abstract [en]

    This thesis is the final module of the Master's program in Electronics Design at Halmstad University. The Master Thesis work is a part of an ongoing development of Halmstad University's reverberation chamber (RC), which is aimed at frequencies in the low GHz range. The development process has been passing in several phases. One phase is to design a mechanical stirrer system which was done by the work presented in another thesis work. The current phase, which is done by this thesis work, is to investigate electromagnetic field uniformity and isotropy while using tuned-mode (stepped stirrer). The frequency 2.4 GHz was chosen because, from one hand, it fits the capability of the assigned equipment for this thesis (spectrum analyzer, signal generator, antennas). On the other hand, it is the operating frequency of a wide range of WIFI and BlueTooth devices that need to be tested inside the RC to comply with the Electromagnetic Compatibility (EMC) standards. The measurement results verified, to a reasonable extent, the field uniformity and isotropy. The standard deviation of all measurements, taken from different eight positions with three different orientations of the receiving antenna, was 1.5dB. It is less than 3dB fulfilling the IEC 61000-4-21standards for frequencies above 400MGHz. Moreover, a quality factor degradation test was conducted, showing a 3.5 dB reduction of the received power when the chamber was loaded by organic material. The received power, while sweeping the bandwidth 800MHz-1.5GHz, was measured. These results indicate that at the resonance frequencies of the chamber, the received power is higher than that at non-resonance frequencies.

    Fulltekst (pdf)
    fulltext
  • 35.
    Aein, Mohamad Javad
    et al.
    Department for Computational Neuroscience at the Bernstein Center Göttingen (Inst. of Physics 3) & Leibniz Science Campus for Primate Cognition, Georg-August-Universität Göttingen, Göttingen, Germany.
    Aksoy, Eren
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS), CAISR Centrum för tillämpade intelligenta system (IS-lab).
    Wörgötter, Florentin
    Department for Computational Neuroscience at the Bernstein Center Göttingen (Inst. of Physics 3) & Leibniz Science Campus for Primate Cognition, Georg-August-Universität Göttingen, Göttingen, Germany.
    Library of actions: Implementing a generic robot execution framework by using manipulation action semantics2019Inngår i: The international journal of robotics research, ISSN 0278-3649, E-ISSN 1741-3176, Vol. 38, nr 8, s. 910-934Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Drive-thru-Internet is a scenario in cooperative intelligent transportation systems (C-ITSs), where a road-side unit (RSU) provides multimedia services to vehicles that pass by. Performance of the drive-thru-Internet depends on various factors, including data traffic intensity, vehicle traffic density, and radio-link quality within the coverage area of the RSU, and must be evaluated at the stage of system design in order to fulfill the quality-of-service requirements of the customers in C-ITS. In this paper, we present an analytical framework that models downlink traffic in a drive-thru-Internet scenario by means of a multidimensional Markov process: the packet arrivals in the RSU buffer constitute Poisson processes and the transmission times are exponentially distributed. Taking into account the state space explosion problem associated with multidimensional Markov processes, we use iterative perturbation techniques to calculate the stationary distribution of the Markov chain. Our numerical results reveal that the proposed approach yields accurate estimates of various performance metrics, such as the mean queue content and the mean packet delay for a wide range of workloads. © 2019 IEEE.

  • 36.
    AFGHANI, AHMAD
    Högskolan i Halmstad, Sektionen för Informationsvetenskap, Data– och Elektroteknik (IDE).
    Reliable Real-Time Communication for Future ITS (Intelligent Transport Systems) using HWA (Heterogeneous Wireless Access)2011Independent thesis Advanced level (degree of Master (Two Years)), 30 poäng / 45 hpOppgave
    Abstract [en]

    In this research oriented master’s thesis we have proposed a future vision of ITS (Intelligent Transport Systems) by utilizing the novel concept of HWA (Heterogeneous Wireless Access). Our proposal is backed by the investigation of the results of experiments conducted at CERES (Centre for Research on Embedded Systems), Halmstad University, Sweden to evaluate the quality of communication for V2V and V2I by using the IEEE 802.11p standard. We have also identified the expected scenarios with need of any other communication technology in replacement of IEEE 802.11p for V2V and V2I communication. We have also investigated the relevant research projects, experiments and their results on the basis of predefined constraints. In the investigated research projects the concept of HWA has been correlated with our proposal of HWA for ITS. We have identified that for smooth integration of any communication technology with IEEE 802.11p, an efficient and smart vertical handover protocol or method will be required. We have presented a blue print of a custom designed vertical handover technique which can be implemented for future ITS with further enhancements and experimental evaluations. We have also evaluated the worst case scenarios to assess the suitability of the HWA for the ITS. We proposed few solutions based on the evaluation of communication scenarios for the integration of IEEE 802.11p with other wireless communication technologies. Finally we have provided some conclusions and suggested future researches which must be conducted to realize the dream of ITS with support of HWA.

    Fulltekst (pdf)
    THESIS_AA
  • 37.
    Afkari, Arash
    Högskolan i Halmstad, Sektionen för ekonomi och teknik (SET).
    Sustainable Low-Cost Housing in Ethiopia: A Study of CSSB-Technology2010Independent thesis Basic level (degree of Bachelor), 10 poäng / 15 hpOppgave
    Abstract [en]

    This degree project is about sustainable low-cost housing in Ethiopia with a focus on CSSB-technology, which is one method of constructing houses. The project allowed me to visit Ethiopia during seven weeks in 2010, to observe, gather information and to perform tests regarding the specific subject. It is a sub-project to a larger research project initiated in 2002 at Halmstad University in an attempt to introduce low-cost housing technologies for the Kambaata Region in Ethiopia. The aim of the research project has been to develop and test new, sustainable, low-cost building technologies intended for the population, with regard to local traditions, needs and affordability.

    Fulltekst (pdf)
    FULLTEXT01
  • 38.
    Afram, Abboud
    et al.
    Högskolan i Halmstad, Akademin för informationsteknologi.
    Sarab Fard Sabet, Danial
    Högskolan i Halmstad, Akademin för informationsteknologi.
    Company Intranet2021Independent thesis Basic level (degree of Bachelor), 10 poäng / 15 hpOppgave
    Abstract [en]

    Many companies use intranets where only authorized personnel can share, create, and access news, events, and knowledge in a company. An intranet is a web application with dynamic content. It consists of various functions and features that facilitate the information management and knowledge flow within the company. The main goal of this project is to create and design an intranet demo that is adaptable and extendable by companies and organizations. The intranet contains various primary functions that users can interact with. The designed intranet is based on the EPiServer Content Management System framework and is programmed in back-end and front-end with the Visual Studio IDE tool. The back- end part is mainly programmed in C# language to create functions and logic such as the intranet structure and then linked to the front-end part where the HTML, CSS, and JavaScript library React is used to encode the front-end and get a user interface. The finalized intranet contains various primary functions where authorized employees have individual profiles with their status and contact information. Users can share corporate events and access corporate news.

    Fulltekst (pdf)
    fulltext
  • 39.
    Afrooz mehr, Mohammad
    et al.
    Högskolan i Halmstad, Sektionen för Informationsvetenskap, Data– och Elektroteknik (IDE).
    Haghpanah, Maziar
    Högskolan i Halmstad, Sektionen för Informationsvetenskap, Data– och Elektroteknik (IDE).
    Optical Flow Features for Event Detection2014Independent thesis Advanced level (degree of Master (Two Years)), 20 poäng / 30 hpOppgave
    Abstract [en]

    In this thesis, we employ optical flow features for the detection of the rigid or non‐rigid single object on an input video. For optical flow estimation, we use the Point Line [PL] method [2] (as a local method) to estimate the motion of the image sequence which is generated from the input video stream. Although the Lukas and Kanade [LK] is a popular local method for estimation of the optical flow, it is weak in dealing with the linear symmetric images even by use of regularization [e.g. Tikhonov]. The PL method is more powerful than the LK method and can properly separate both line flow and point flow. For dealing with rapidly changing data in some part of an image (high motion problem), a gaussian pyramid with five levels (different image resolutions) is employed. In this way, the pyramid height (Level) must be chosen properly according to the maximum optical flow that we expect in each section of the image without iteration. After determining the best‐estimated optical flow vector for every pixel, the algorithm should detect an object on video with its direction to the right or left. By using techniques such as segmentation and averaging the magnitude of flow vectors the program can detect and distinguish rigid objects (e.g. a car) and non‐rigid objects (e.g. a human). Finally the algorithm makes a new video output that includes detected object with flow vectors, the pyramid levels map which has been used for optical flow estimation and a respective binary image.

    Fulltekst (pdf)
    Final thesis report
  • 40.
    Aftab, Mohammad Adnan
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap.
    Biofuel, An alternative source for jet fuel in Aviation2017Independent thesis Advanced level (degree of Master (One Year)), 10 poäng / 15 hpOppgave
    Abstract [en]

    The transport industry is one of the fastest growing industries with the sector playing a significant role in negative impact on global warming and pollution through the emission of greenhouse gases. Aviation in particular, has enjoyed growth especially in the few decades. New airlines and aircraft manufacturers are coming up with different innovations and technologies to ensure they make the best possible environmentally friendly aircraft. The new main area of focus has been on how to come up with fuel that will reduce the greenhouse gas-emissions. The stakeholders in the same effort include developed nations like the United States, United Kingdom, Russia, France, Germany, and Canada among others. Energy providers as well as jet fuel suppliers are also making efforts to conserve the environment. The purpose of this thesis is to explore the area of biofuel in aviation by looking into various stakeholders involved in the efforts of the transition from fossil fuel to biofuel. The conclusion of this thesis is that biofuels are viable options in the aviation industries since there have been positive results in the tests made. 

    Fulltekst (pdf)
    fulltext
  • 41.
    Afzal, Wahaj
    Högskolan i Halmstad, Akademin för informationsteknologi, Centrum för forskning om tillämpade intelligenta system (CAISR).
    A Rule-based approach for detection of spatial object relations in images2023Independent thesis Advanced level (degree of Master (Two Years)), 20 poäng / 30 hpOppgave
    Abstract [en]

    Deep learning and Computer vision are becoming a part of everyday objects and machines. Involvement of artificial intelligence in human’s daily life open doors to new opportunities and research. This involvement provides the idea of improving upon the in-hand research of spatial relations and coming up with a more generic and robust algorithm that provides us with 2-D and 3-D spatial relations and uses RGB and RGB-D images which can help us with few complex relations such as ‘on’ or ‘in’ as well. Suggested methods are tested on the dataset with animated and real objects, where the number of objects varies in every image from at least 4 to at most 10 objects. The size and orientation of objects are also different in every image.  

    Fulltekst (pdf)
    fulltext
  • 42.
    Agelis, Sacki
    Högskolan i Halmstad, Sektionen för Informationsvetenskap, Data– och Elektroteknik (IDE), Halmstad Embedded and Intelligent Systems Research (EIS).
    Reconfigurable Optical Interconnection Networks for High-Performance Embedded2005Licentiatavhandling, med artikler (Annet vitenskapelig)
    Abstract [en]

    In embedded computer and communication system the capacity demand for interconnection networks is increasing continuously in order to achieve high-performance systems. Recent breakthroughs show that by using reconfigurability inside a single chip substantial performance gains can be added. However, in this thesis the focus is on system level reconfigurability (between chips or modules) and the performance gains that potentially can be achieved by having support for runtime reconfigurability on the system level.This thesis addresses the field of runtime system level reconfigurability with the use of optics in switches and routers for data- and telecommunications, and in multi-processor systems used for embedded signal processing. Several reconfigurable systems for switching and routing with support to adapt for asymmetric traffic patterns are proposed and compared to identify how design choices affect flexibility, performance etc. The proposed solutions are characterized by their multistage optical interconnection networks with reconfigurable shuffle patterns, where the reconfigurability is provided by micro-optical-electrical mechanical systems. More specifically, application-specific bottlenecks can be resolved by reconfiguring the interconnection network according to the current application demands. The benefits of the architectural solutions are confirmed by simulations that clearly show that the architectures can achieve high performance for both symmetric application characteristics and for several classes of asymmetric application characteristics. The final architectural solution is characterized by electronic packet-switches interconnected through an optical backplane, which is reconfigurable. Moreover, the thesis presents how several signal processing applications can be mapped to run concurrently in a time-shared scheme on a single reconfigurable multi-processor system that has high flexibility to adapt for the application currently at hand. The interconnection network is then adapted (reconfigured) according to the demands of the currently executed application in each time instance. The analysis shows that it is feasible to build such a system with today’s components.

  • 43.
    Agelis, Sacki
    et al.
    Högskolan i Halmstad, Sektionen för Informationsvetenskap, Data– och Elektroteknik (IDE), Halmstad Embedded and Intelligent Systems Research (EIS), Centrum för forskning om inbyggda system (CERES).
    Jonsson, Magnus
    Högskolan i Halmstad, Sektionen för Informationsvetenskap, Data– och Elektroteknik (IDE), Halmstad Embedded and Intelligent Systems Research (EIS), Centrum för forskning om inbyggda system (CERES).
    Reconfigurable optical interconnection system supporting concurrent application-specific parallel computing2005Inngår i: 17th Symposium on Computer Architecture and High Performance Computing: SBAC-PAD 2005 : proceedings : 24-27 October, 2005, Rio de Janeiro, PR, Brazil / [ed] Claudio L. Amorim, Washington, DC, USA: IEEE Computer Society, 2005, s. 44-51Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Application specific architectures are highly desirable in embedded parallel computing systems at the same time as designers strive for using one embedded parallel computing platform for several applications. If this can be achieved, the cost can be decreased in comparison to using several different embedded parallel computing systems. This paper presents a novel approach of running several high-performance applications concurrently on one single parallel computing system. By using a reconfigurable backplane interconnection system, the applications can be run efficiently with high network flexibility since the interconnect network can be adapted to fit the application that is being processed for the moment. More precisely, this paper investigates how the space time adaptive processing (STAP) radar algorithm and the stripmap synthetic aperture radar (SAR) algorithm can be mapped on a multi-cluster processing system with a reconfigurable optical interconnection system realized by a micro-optical-electrical mechanical system (MOEMS) crossbars. The paper describes the reconfigurable platform, the two algorithms and how they individually can be mapped on the targeted multiprocessor system. It is also described how these two applications can be mapped simultaneously on the optical reconfigurable platform. Implications and requirements on communication bandwidth and processor performance in different critical points of the two applications are presented. The results of the analysis show that an implementation is feasible with today's MOEMS technology, and that the two applications can be successfully run in a time-sharing scheme, both at the processing side and at the access for interconnection bandwidth.

    Fulltekst (pdf)
    FULLTEXT01
  • 44.
    Agelis, Sacki
    et al.
    Högskolan i Halmstad, Sektionen för Informationsvetenskap, Data– och Elektroteknik (IDE), Halmstad Embedded and Intelligent Systems Research (EIS).
    Jonsson, Magnus
    Högskolan i Halmstad, Sektionen för Informationsvetenskap, Data– och Elektroteknik (IDE), Halmstad Embedded and Intelligent Systems Research (EIS).
    System-Level Runtime Reconfigurablity - Optical Interconnection Networks for Switching Applications2004Inngår i: Proceedings of the International Conference on Engineering of Reconfigurable Systems and Algorithms, ERSA'04 / [ed] Toomas P Plaks & M Gokhale, Athens, USA: CSREA Press, 2004, s. 155-162Konferansepaper (Fagfellevurdert)
    Abstract [en]

    The performance requirements on data and telecommunication switches and routers are continuously increasing and it is evident that new ideas and architectures must come to light to satisfy these new demands. In this paper, a runtime reconfigurable modular design approach is presented, using state-of-the-art microoptical-electrical mechanical system (MOEMS) components. The paper introduces a novel field of reconfigurability, where reconfiguration is made on the system level instead of, e.g. fine-granularity reconfigurable logic. Different reconfigurable system solutions with support to adapt for asymmetric traffic patterns are proposed and compared to see how design choices affect flexibility, performance etc. The proposed solutions are characterized by their multistage networks with reconfigurable shuffle patterns.

  • 45.
    Agelis, Sacki
    et al.
    Högskolan i Halmstad, Sektionen för Informationsvetenskap, Data– och Elektroteknik (IDE), Halmstad Embedded and Intelligent Systems Research (EIS).
    Jonsson, Magnus
    Högskolan i Halmstad, Sektionen för Informationsvetenskap, Data– och Elektroteknik (IDE), Halmstad Embedded and Intelligent Systems Research (EIS).
    Visualizing the Potential of Reconfigurable Shuffle-Patterns in Optoelectronic Routers by the Use of MOEMS2004Inngår i: Proceedings of the IASTED International Conference Communication Systems and Networks / [ed] Salvador C.E.P., Calgary, Canada: ACTA Press, 2004, s. 148-154Konferansepaper (Fagfellevurdert)
    Abstract [en]

    A reconfigurable high performance multistage router architecture is presented and simulated. The router backbone network is an optical shuffle exchange network that has the power of reconfigurability through the use of micro-optical-electrical mechanical systems (MOEMS). The router is subjected to different application classes. The application classes have different characteristics in terms of symmetric/asymmetric traffic properties. We compare our reconfigurable shuffle-pattern for all three application classes for the specified router architecture.

  • 46.
    Agnoletto, Daniel
    et al.
    Institute of Informatics, Federal University of Rio Grande do Sul, Porto Alegre, Brazil.
    Jonsson, Magnus
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS), Centrum för forskning om inbyggda system (CERES).
    Pignaton de Freitas, Edison
    Institute of Informatics, Federal University of Rio Grande do Sul, Porto Alegre, Brazil.
    Time slot transmission scheme with packet prioritization for Bluetooth low energy devices used in real-time applications2020Inngår i: International Journal of Wireless Information Networks, ISSN 1068-9605, E-ISSN 1572-8129, Vol. 27, nr 4, s. 518-534Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Bluetooth Low Energy (BLE) is one of the most important technologies that feed the growing field of Internet of Things and Wireless Sensor Networks. Due to its flexibility and unique low power-consumption, an increasing number of industrial devices, household appliances and wearables are being designed using it. However, the real-time demands of these networks such as timing and Quality of Service are not fully covered by the protocol itself. To help improve and offer some control over these characteristics, this paper presents a time slot transmission scheme with packet prioritization. It is based on the division and allocation of the connection interval to two types of messages: real-time and ordinary. The goal is to offer the lowest packet loss and time guarantees for real-time messages, while providing acceptable throughput for ordinary ones. Since the probability of a BLE connection to close increases with the number of packets sent through it, the position where a real-time packet is being sent as well as the number of ordinary messages in a connection represent key factors. The use of the first and last slot for real-time packets with ordinary flow restricted to the space between them decreases the transmission delay uncertainty and allows probability tuning based on the number of ordinary messages. Simulations were performed using the proposed scheme and a reduction of more than 100 times in the delay variance was observed for real-time transmissions. Regarding reliability, around 5% of the packets were lost for a bit error rate of 10−3. © 2020, Springer Science+Business Media, LLC, part of Springer Nature.

  • 47.
    Ahankoob, Alireza
    et al.
    School of Property, Construction and Project Management, RMIT University, Melbourne, Australia.
    Manley, Karen
    Högskolan i Halmstad, Akademin för företagande, innovation och hållbarhet.
    Abbasnejad, Behzad
    School of Property, Construction and Project Management, RMIT University, Melbourne, Australia.
    The role of contractors’ building information modelling (BIM) experience in realising the potential values of BIM2022Inngår i: International Journal of Construction Management, ISSN 1562-3599, Vol. 22, nr 4, s. 588-599Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    There has been recently a growing attention towards the potential benefits of building information modelling (BIM) in construction business processes from both academia and industry practitioners. While prior research has emphasised that there is a link between the proficiency of construction companies to use BIM and the realisation of BIM benefits, little evidence exists to capture this relationship. The aim of this study is to explore the extent to which prior BIM experiences influence the perception of industry experts on potential BIM benefits. The influence of years of BIM experience on the discernment of BIM potential benefits was examined through a survey of Australian building contractors. The results of the analysis of variance (ANOVA) showed that BIM experience was a significant factor in the realisation of potential BIM benefits. The results suggest that an increase in years of BIM experience foster a better understanding of BIM benefits, which consequently can lead to a more inspiring movement towards the adoption of BIM by construction organisations. The main contribution of this article is to increase awareness towards the adoption and implementation of BIM by making a link between BIM proficiency and an increased perception of BIM potential benefits in construction organisations. © 2019 Informa UK Limited, trading as Taylor & Francis Group.

  • 48.
    Ahankoob, Alireza
    et al.
    RMIT University, Melbourne, Australia.
    Manley, Karen
    Högskolan i Halmstad, Akademin för företagande, innovation och hållbarhet.
    Hon, Carol
    Queensland University of Technology, Brisbane, Australia.
    Drogemuller, Robin
    Queensland University of Technology, Brisbane, Australia.
    The influence of building information modelling on the absorptive capacity of project-based organisations2023Inngår i: Architectural Engineering and Design Management, ISSN 1745-2007, E-ISSN 1752-7589, Vol. 19, nr 1, s. 1-21Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Absorptive capacity (AC) is a theoretical construct that measures the capacity of an organisation to absorb knowledge from external sources to sustain competitive advantage. Information dispersion makes it difficult for project-based organisations (PBOs) to absorb new ideas. The current study uses AC theory to examine how the use of building information modelling (BIM) affects the capacity of building contractors to absorb new information and become more competitive. A desktop study of secondary sources was undertaken to assess if there is a potential link between BIM and contractor AC. This revealed that the potential benefits of BIM’s technical features are motivated through its functional attributes. Exploratory factor analysis (EFA) was used to clarify the underlying relationship of a cluster of variables. The results of EFA led to the confirmed three categories for BIM functional attributes, including: (1) integration, (2) comprehensibility, and (3) transparency. Multiple regression analysis was used to explore the latent relationship between BIM functional attributes and contractor AC. The regression analysis of survey data, which was gathered from 56 building contractors in Queensland, Australia, showed that the transparency function of BIM functional attributes significantly correlated with acquisition and transformation dimensions of contractor AC. The study confirms a link between BIM and contractor AC, providing further evidence of the importance of BIM in sustaining the competitive advantage of project-based organisations. © 2021 Informa UK Limited, trading as Taylor & Francis Group.

  • 49.
    Ahlberg, Jimmie
    et al.
    Högskolan i Halmstad, Akademin för företagande, innovation och hållbarhet.
    Herbertsson, Gustav
    Högskolan i Halmstad, Akademin för företagande, innovation och hållbarhet.
    Skjuvkraftskapacitet för infästning i närheten av fri kant på prefabricerade betongelement2023Independent thesis Basic level (professional degree), 10 poäng / 15 hpOppgave
    Abstract [en]

    Correct dimensioning of mounting plates near an edge in concrete is of utmost importance to prevent breakage. This study, which is primarily experimental, investigates the capacity of a certain type of embedded mounting plate when placed adjacent to an underlying edge. The purpose is to gain an understanding of how these mounting plates should be dimensioned against edge breakage and to investigate how a transverse bar affects the shear capacity near an edge. The study presents the results from practical tests and compares them with calculations made according to the Eurocode. The results show that the actual fastening has a higher strength than what is described in the calculation models from the standards. Full-scale testing and dimensioning guidelines based on testing led to comparable results in the experiment. The method used in the experiment yielded promising results and shows that calculations according to the Eurocode do not correspond to reality. Instead, the capacity turns out to be significantly higher than what is shown after calculations according to interpretations of standards.

    Fulltekst (pdf)
    fulltext
  • 50.
    Ahlbäck, David
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap.
    KONCEPTANALYS OCH DRIFTFALLSOPTIMERING AV "FREEPOWER – SOLAR BOAT"2019Independent thesis Basic level (university diploma), 10 poäng / 15 hpOppgave
    Abstract [en]

    This report aims to analyse the concept of Bjurtech AB:s ongoing development project “Freepower - Solar Boat”. Main focuses are technical optimization and usability from an end user perspective. Bjurtechs idea is to build an electric-powered 5-meter boat charged by integrated photovoltaic cells. The project´s intended pilot market is Sri Lankas coastal fishing fleet. A version for the Scandinavian market is also under consideration and both concepts are analysed in this report. Initially a 4.5-meter prototype was built and tested to try the concept in practise. Methods used are computer simulations in Matlab based on data collected from trail runs with the prototype combined with weather data from Sri Lanka and Sweden. The data and simulations were then used to try to determine whether the concept works for the intended target markets, as well as how the assumed user profiles affect usability and technical deterioration such as battery life. The approach used was to try to determine how to maximize the availability of the system in regards to battery charge level over the whole year at the same time as maximizing distance and boat speed per day. The systems CO2 emissions were then compared to an equivalent petrol-powered boat with the same amount of running hours over 25 years. The main findings of the study are, provided 12 to 14.5 nautical miles is regarded as a sufficient daily distance at 3 to 3.7 knots boat speed, that the system can deliver a high level of availability all year around for fishing operations in Sri Lanka. Considering the demand for daily availability is not as high for the assumed recreational use in Scandinavian markets the system is deemed to perform at a satisfactory level at these latitudes as well. The CO2 comparison showed a significant emissions decrease in the case of year around operations in Sri Lanka. In Scandinavia a reduction is obtained if there are a sufficient amount of operating hours per year. An increase of the installed rated power, Wp, was found to be the most cost efficient way of improving overall performance and that the prototypes photovoltaics of 580 Wp should in both the Sri Lankan and Scandinavian case be increased to a minimum of 800 Wp. Finally it was concluded that user awareness of how system operation impacts battery life can be of significant importance for a positive environmental result and long technical lifetime.

    Fulltekst (pdf)
    fulltext
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