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  • 1.
    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 method2016Självständigt arbete på avancerad nivå (magisterexamen), 40 poäng / 60 hpStudentuppsats (Examensarbete)
    Abstract [sv]

    Numera är tre-fas asynkronmotorer i stor utsträckning på industriella och andra typer av processer. Därför är det mycket viktigt att ha exakt kunskap om en induktionsmotorprestanda för att ha en uppfattning om dess driftsförhållanden . Denna studie är en fortsättning av en tidigare, där direkt och mjukstart metoder för trefasmotorer har simulerats och jämförts. Såsom i den tidigare studien, är teorin bakom denna en baserat på representerar den verkligamotorn av en uppsättning ekvationer och värden i Matlab, som bildar en motsvarande ideell motor på ett sätt där alla de fysiska effekterna är likartade . Motorn startas under tre olika frekvenser i VVVF metod med stöd simulering av ström, vridmoment, hastighet, effektivitetoch effektfaktorn kurvor. Därefter, resultaten av de tre startmetoder diskuteras och jämföras.

  • 2.
    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 steamer2010Självständigt arbete på avancerad nivå (masterexamen), 5 poäng / 7,5 hpStudentuppsats (Examensarbete)
    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.

  • 3.
    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?2013Självständigt arbete på grundnivå (högskoleexamen), 10 poäng / 15 hpStudentuppsats (Examensarbete)
  • 4.
    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 information2010Självständigt arbete på grundnivå (högskoleexamen), 15 poäng / 22,5 hpStudentuppsats (Examensarbete)
    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.

  • 5.
    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 analys2016Självständigt arbete på grundnivå (högskoleexamen), 10 poäng / 15 hpStudentuppsats (Examensarbete)
    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. 

  • 6.
    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 networks2012Ingår i: EURASIP Journal on Wireless Communications and Networking, ISSN 1687-1472, E-ISSN 1687-1499, Art nr 45- s.Artikel i tidskrift (Refereegranskat)
  • 7.
    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 städmaskin2015Självständigt arbete på grundnivå (högskoleexamen), 10 poäng / 15 hpStudentuppsats (Examensarbete)
    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.

  • 8.
    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 Monitoring2014Självständigt arbete på grundnivå (högskoleexamen), 5 poäng / 7,5 hpStudentuppsats (Examensarbete)
    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.

  • 9.
    Adiego Abad, Sonia
    Högskolan i Halmstad, Sektionen för ekonomi och teknik (SET).
    Degree project:HOSTEL2011Självständigt arbete på grundnivå (kandidatexamen), 10 poäng / 15 hpStudentuppsats (Examensarbete)
    Abstract [sv]

    Ett byggnadsprojekt med planering, kostnadsberäkning och projektering av en/ett ”Hostel” på en fastighet i Halmstad.

  • 10.
    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)2011Självständigt arbete på avancerad nivå (masterexamen), 30 poäng / 45 hpStudentuppsats (Examensarbete)
    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.

  • 11.
    Afkari, Arash
    Högskolan i Halmstad, Sektionen för ekonomi och teknik (SET).
    Sustainable Low-Cost Housing in Ethiopia: A Study of CSSB-Technology2010Självständigt arbete på grundnivå (kandidatexamen), 10 poäng / 15 hpStudentuppsats (Examensarbete)
    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.

  • 12.
    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 Detection2014Självständigt arbete på avancerad nivå (masterexamen), 20 poäng / 30 hpStudentuppsats (Examensarbete)
    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.

  • 13.
    Aftab, Mohammad Adnan
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap.
    Biofuel, An alternative source for jet fuel in Aviation2017Självständigt arbete på avancerad nivå (magisterexamen), 10 poäng / 15 hpStudentuppsats (Examensarbete)
    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. 

  • 14.
    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, sammanläggning (Övrigt vetenskapligt)
    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.

  • 15.
    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 computing2005Ingår 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, 44-51 s.Konferensbidrag (Refereegranskat)
    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.

  • 16.
    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 Applications2004Ingår 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, 155-162 s.Konferensbidrag (Refereegranskat)
    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.

  • 17.
    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 MOEMS2004Ingår i: Proceedings of the IASTED International Conference Communication Systems and Networks / [ed] Salvador C.E.P., Calgary, Canada: ACTA Press, 2004, 148-154 s.Konferensbidrag (Refereegranskat)
    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.

  • 18.
    Ahlqvist, Mattias
    et al.
    Högskolan i Halmstad, Sektionen för ekonomi och teknik (SET).
    Jönsson, Olof
    Högskolan i Halmstad, Sektionen för ekonomi och teknik (SET).
    Matningssystem för pellets2011Självständigt arbete på grundnivå (kandidatexamen), 15 poäng / 22,5 hpStudentuppsats (Examensarbete)
    Abstract [sv]

    Energi är i dagens samhälle en central del i vår vardag där priserna på energi i Sverige har ökat under de senaste decennierna. En stor del av energikonsumtionen går till uppvärmning av småhus där uppvärmningsmetoder som el, fjärrvärme, eldningsolja, gas och biobränslen är vanligast. Framförallt under vinterperioderna blir detta ett reellt problem för småhusägare då kostnaderna för uppvärmningen ökar. Mest påtagligt blir uppvärmningskostnaderna för småhusägare med eluppvärmning.  

    Examensarbetet skrivs vid Högskolan i Halmstad och görs i samarbete med ett företag vilket gör att delar av rapporten omfattas av sekretess. Uppdraget, som är en del av en produktutveckling, är att finna en tekniskt tillfredsställande lösning för att transportera pellets. Detta med krav på minimal konstruktionsförändring på den befintliga produkten, vilket ställer krav på utformningen av systemet. Den slutgiltiga produkten är tänkt att kunna erbjuda en ökad användbarheten av produkten.

    I samband med framtagningen av prototypen har det även gjorts kostnadskalkyler och upplägg av produktionsprocessen för att ge en bild över kostnader för implementering av systemet. Även en kortfattad analys av marknaden för produkten och pellets har gjorts för att skapa en bild av produktens möjliga genomslagskraft. I kombination med detta har även kundens perspektiv analyserats genom att göra investeringsberäkningar för att se hur lång tid det tar för investeringen att återbetala sig. 

  • 19.
    Ahmadi, Lina
    Högskolan i Halmstad, Akademin för informationsteknologi.
    Green Driving Application: Eco Driving2016Självständigt arbete på grundnivå (högskoleexamen), 10 poäng / 15 hpStudentuppsats (Examensarbete)
    Abstract [en]

    Eco-driving has acquired great importance in recent years because it is a way to reduce energy consumption that can be applied to any type of vehicle. However, for these rules to be applied requires a process of continuous learning and motivation. For this reason many eco-driving assistants have emerged.

    This paper presents Green Driving, a driver safety app for Android that detects inattentive driving behaviors and gives corresponding feedback to drivers, scoring their driving and alerting them in case their behaviors are unsafe.  It’s about changing a person’s driving behavior by providing some kind of advice to the driver.  I have worked on an algorithm that is meant to reduce the fuel consumption of users. The algorithm is deployed in an android application.

    This application “Green Driving” is aimed at users with cars. It is basically like an assistant, suggesting the user when he should make the right gear changes, when to increase/decrease speed and avoids hard braking and rapid acceleration and etc. It is in order to drive economically, ecologic and in turn save money and safety. This is a smart way of letting a user drive economically and ecologic since almost everyone has an Android smartphone now. 

  • 20.
    Ahmed, Rizwan
    et al.
    Högskolan i Halmstad, Sektionen för Informationsvetenskap, Data– och Elektroteknik (IDE).
    Abbas, Shahid
    Högskolan i Halmstad, Sektionen för Informationsvetenskap, Data– och Elektroteknik (IDE).
    Electrical and Optical Characteristics of InP Nanowires based p-i-n Photodetectors2010Självständigt arbete på avancerad nivå (magisterexamen), 10 poäng / 15 hpStudentuppsats (Examensarbete)
    Abstract [en]

    Photodetectors are a kind of semiconductor devices that convert incoming light to an electrical signal. Photodetectors are classified based on their different structure, fabrication technology, applications and different sensitivity. Infrared photodetectors are widely used in many applications such as night vision, thermal cameras, remote temperature sensing, and medical diagnosis etc.

     

    All detectors have material inside that is sensitive to incoming light. It will absorb the photons and, if the incoming photons have enough energy, electrons will be excited to higher energy levels and if these electrons are free to move, under the effect of an external electric field, a photocurrent is generated.

     

    In this project Fourier Transform Infrared (FT-IR) Spectroscopy is used to investigate a new kind of photodiodes that are based on self-assembled semiconductor nanowires (NWs) which are grown directly on the substrate without any epi-layer. The spectrally resolved photocurrent (at different applied biases) and IV curves (in darkness and illumination) for different temperatures have been studied respectively. Polarization effects (at low and high Temperatures) have been investigated.  The experiments are conducted for different samples with high concentration of NWs as well as with lower concentration of NWs in the temperature range from 78 K (-195ºC) to 300 (27ºC). These photodiodes are designed to work in near infrared (NIR) spectral range.

     

    The results show that the NW photodetectors indeed are promising devices with fairly high break down voltage, change of photocurrent spectra with polarized light, low and constant reverse saturation current (Is). The impact of different polarized light on photocurrent spectra has been investigated and an attempt has been made to clarify the observed double peak of InP photocurrent spectrum. Our investigations also include a comparison to a conventional planar InP p-i-n photodetector.

     

  • 21.
    Akinola, Azeez Paul
    et al.
    Högskolan i Halmstad, Sektionen för Informationsvetenskap, Data– och Elektroteknik (IDE).
    chong, zhang
    Högskolan i Halmstad, Sektionen för Informationsvetenskap, Data– och Elektroteknik (IDE).
    Tunnel comparison between Generic Routing Encapsulation (GRE) and IP Security (IPSec)2012Självständigt arbete på grundnivå (högskoleexamen), 5 poäng / 7,5 hpStudentuppsats (Examensarbete)
    Abstract [en]

    Since the introduction of networks, they have been used amongst home users, companies and organizations and most damage on the network is due to inappropriate security configurations. To secure networks, a protocol suite can be used to encrypt and authenticate all IP packets of a session. Therefore, this report will include the advantages and possible solution of some techniques used to offer increased network security such as scalability and data confidentiality. Captures of traffic sent using the two security techniques, IPSec/VPN and GRE-Tunnel will be monitored. The objective behind this project is to configure a network with these two different tunneling techniques and compare the security and network performance. The report also describes the security problems encountered by networks such as the ignorance of network users, vulnerabilities and the security of the devices.IPSecis a standard security protocol solution for TCP/IP, and it provides security through authentication, encryption and data integrity. GRE encapsulates packets and create a logical hub-and spoke topology of virtual point-to-point connections. The Jperf-tool is used to measure network performance and show specific details while another tool, Wireshark is used to analyze the information captured during transmission of data sent using IPSEC and GRE. The comparison further finds that IPSec-tunnel technique makes data transfers very secure but causes network performance disadvantages in comparison to a GRE solution.

  • 22.
    Akinola, Azeez Paul
    et al.
    Högskolan i Halmstad, Sektionen för Informationsvetenskap, Data– och Elektroteknik (IDE).
    Zhang, Chong
    Högskolan i Halmstad, Sektionen för Informationsvetenskap, Data– och Elektroteknik (IDE).
    Evaluate Security on the Internet Cafe2013Självständigt arbete på grundnivå (kandidatexamen), 10 poäng / 15 hpStudentuppsats (Examensarbete)
    Abstract [en]

    Internet security (Network security) is a big topic that is very important in our society communication system, but it is extremely dynamic and wide in scope. This is the reason that many companies and organizations invest heavily in a dedicated infrastructure security and highly trained specialists.The aim of security monitoring and preventing the network from cyber threats requires vigilance over the network equipment. The case study of this thesis is to provide the possible solution to the problems encountered by the namely network users such as: Internet Game Center (Centrum Halmstad, Sweden) and, the Blueville Internet Cafe (Ede, Nigeria).Our research and information collected over the telephone and a visit at the nearest office. We concluded that both companies mentioned above experienced similar cyber threats. The two companies have internal and external threats such as accessing the network via ssh by using it brute force attack, network war-driver, the installation of spyware, password sniffer, viruses, SQL injection and PHP attacks (web attacks) on the networks. The cyber threats virus and spyware are among the big internet threat to users, organization and companies.We carry out experiments in the lab to tests for threats such as brute force (ssh) attack, password sniffer and war-driver in the Wireless environment. From the results, we are able to the select WPA2 using 802.1x as the best possible way to limit and reduce the strength of cyber-attacks, and as a suggested solution to the namely café problems in our report. We also list different suggestion and solution to the cyber café attacks from our research papers and information gathers from different sources such as library, internet, seminar and textbooks.

  • 23.
    Akram, Asif
    et al.
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS), Människa och Informationsteknologi (MI-lab).
    Åkesson, Maria
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS), Människa och Informationsteknologi (MI-lab).
    A Research Framework to Study how Digital Service Innovation Transforms Value Networks2011Ingår i: Proceedings of IRIS 2011 / [ed] Leino, Timo, Turku, Finland: Turku Center for Computer Science , 2011, 29-40 s.Konferensbidrag (Refereegranskat)
    Abstract [en]

    This paper reports from preparations in an ongoing research study concerning how digital service innovation transforms value networks in manufacturing industries. The research study is in the context of the vehicle industry and concerns digital e-maintenance services based on remote diagnostics systems. This digital service innovation in particular is of great importance since manufacturing industries have great potential to expand their business and found new and extended boundaries and relationships with other stakeholder in a network they are attached to. Core challenges and opportunities for digital service innovation will lead us to the study of its influence on the business and innovation environment i.e. the value network. This paper presents a framework to study how digital service innovation transforms value networks based on literature reviews on value network, digital innovation and transformation of value networks.

  • 24.
    Al Hayani, Musab
    Högskolan i Halmstad, Sektionen för Informationsvetenskap, Data– och Elektroteknik (IDE).
    Modeling Bus Load on CAN2012Självständigt arbete på avancerad nivå (masterexamen), 20 poäng / 30 hpStudentuppsats (Examensarbete)
    Abstract [en]

    The existence of high load and latency in the CAN bus network would indeed lead to a situation where a given message crosses its deadline; this situation would disturb the continuity of the required service as well as activating fault codes due to delay of message delivery, which might lead to system failure.

    The outcome and goal of this thesis is to research and formulate methods to determine and model busload and latencies, by determining parameters such as alpha and breakdown utilization, which are considered as indications to the start of network breakdown when a given message in a dataset start to introduce latency by crossing its deadline which are totally prohibited in critical real time communications.

    The final goal of this master thesis is to develop a TOOL for calculating, modeling, determining and visualizing worst case busload, throughput, networks’ breakdown points and worst case latency in Scania CAN bus networks which is based on the J1939 protocol.

    SCANLA (The developed CAN busload analyzer tool in this thesis) is running as an executable application and uses a Graphical User Interface as a human-computer interface (i.e., a way for humans to interact with the tool) that useswindows,icons and menus and which can be manipulated by a mouse.

  • 25.
    Al Shalabi, Ammar
    et al.
    Multimedia University, Melaka, Malaysia.
    Omar, Mohammed K.
    Multimedia University, Melaka, Malaysia.
    Rundquist, Jonas
    Högskolan i Halmstad, Sektionen för ekonomi och teknik (SET), Centrum för innovations-, entreprenörskaps- och lärandeforskning (CIEL), Centre for Technology, Innovation and Marketing Management (CTIM2).
    Processes and strategies of NPD: A survey of Malaysian Industry2008Ingår i: International Journal of Manufacturing Science and Technology, ISSN 1524-1548, Vol. 10, nr 1, 91-95 s.Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    In recent years, there has been a considerable interest in Malaysian manufacturing firms in New Product Development (NPD) which is considered to be indirectly a booster for the success of a firm. The purpose of the study is to highlight the NPD processes and methods used in Malaysian industry. This paper focuses only on the formal NPD-processes and NPD-strategies. From the available database, it is found that there are 250 confirmed companies from automotive, chemical, and electrical industries, which have R&D facilities; out of which 36% have agreed to participate in the survey, and 29% questionnaires have been used. The results show that the best firms have their R&D and NPD departments either overseas or partially in Malaysia.

  • 26.
    Alam, Ashraful
    Högskolan i Halmstad, Sektionen för Informationsvetenskap, Data– och Elektroteknik (IDE).
    Parallelization of the Estimation Algorithm of the 3D Structure Tensor2012Självständigt arbete på avancerad nivå (masterexamen), 20 poäng / 30 hpStudentuppsats (Examensarbete)
    Abstract [en]

    This thesis work provides the implementation of 3D structure tensor on a Massively Parallel Processor Array (MPPA), Ambric 2045.

     

    The 3D structure tensor algorithm is often used in image processing applications to compute the optical flow or to detect local 3D structures and their directions. The 3D structure tensor algorithm (3D-STA) consists of three main parts: gradient, tensor and smoothing. This algorithm is computationally expensive due to many multiplications and additions which are required to calculate the gradient (edge), the tensor and to smooth every pixel of the image. This is why this algorithm is very slow to run on a single processor. Therefore, it is important to make it parallel for high performance computation.

     

    This thesis provides two parallel implementations of 3D-STA; namely coarse-grained parallelism and fine-grained parallelism. Ambric has 336 processors. Only 49 processors are used in coarse-grained implementation and 165 processors are used in fine-grained implementation. The performance of the two implementations is measured using a video stream input, consisting of a sequence of images of size 20x256x256. The performance of the coarse-grained parallelism implementation is 25 frames per second (fps) and the one of the fine-grained parallelism implementation is 100 fps. Thus the fine-grained version is four time faster than the coarse-grained one.

     

    Additionally, the results are compared with the result of the Matlab implementation, running on Intel(R) Core 2 duo @2.10 GHz processor and also compared with another parallel optical flow implementation, in terms of speed and efficiency. The coarse-grained implementation is 58 times faster than the Matlab implementation and it achieves approximately half of the performance of the other parallel optical flow implementation. On the other hand, the fine-grained implementation is 230 times faster than the Matlab implementation and more than twice as (100/43) fast as the other parallel optical flow implementation.

     

    These performance results are satisfactory and the results that our parallel implementations can be considered for real-time applications.

     

  • 27.
    Alam, Ashraful
    et al.
    Högskolan i Halmstad, Sektionen för Informationsvetenskap, Data– och Elektroteknik (IDE).
    Ul-Abdin, Zain
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS), Centrum för forskning om inbyggda system (CERES).
    Svensson, Bertil
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS), Centrum för forskning om inbyggda system (CERES).
    Parallelization of the Estimation Algorithm of the 3D Structure Tensor2012Ingår i: 2012 International Conference on Reconfigurable Computing and FPGAs, ReConFig 2012 / [ed] Peter Athanas, René Cumplido & Eduardo de la Torre, Piscataway, N.J.: IEEE Press, 2012, 6416771Konferensbidrag (Refereegranskat)
    Abstract [en]

    The three dimensional structure tensor algorithm (3D-STA) is often used in image processing applications to compute the optical flow or to detect local 3D structures and their directions. This algorithm is computationally expensive due to many computations that are required to calculate the gradient, the tensor, and to smooth every pixel of the image frames. Therefore, it is important to parallelize the implementation to achieve high performance. In this paper we present two parallel implementations of 3D-STA; namely moderately parallelized and highly parallelized implementation, on a massively parallel reconfigurable array. Finally, we evaluate the performance of the generated code and results are compared with another optical flow implementation. The throughput achieved by the moderately parallelized implementation is approximately half of the throughput of the Optical flow implementation, whereas the highly parallelized implementation results in a 2x gain in throughput as compared to the optical flow implementation. © 2012 IEEE.

  • 28.
    Albayrak, Aras
    Högskolan i Halmstad, Sektionen för Informationsvetenskap, Data– och Elektroteknik (IDE), Halmstad Embedded and Intelligent Systems Research (EIS).
    Automatic Pose and Position Estimation by Using Spiral Codes2014Självständigt arbete på avancerad nivå (masterexamen), 20 poäng / 30 hpStudentuppsats (Examensarbete)
    Abstract [en]

    This master thesis is about providing the implementation of synthesis, detection of spiral symbols and estimating the pan/tilt angle and position by using camera calibration. The focus is however on the latter, the estimation of parameters of localization.

    Spiral symbols are used to be able to give an object an identity as well as to locate it. Due to the spiral symbol´s characteristic shape, we can use the generalized structure tensor (GST) algorithm which is particularly efficient to detect different members of the spiral family. Once we detect spirals, we know the position and identity parameters of the spirals within an apriori known geometric configuration (on a sheet of paper). In turn, this information can be used to estimate the 3D-position and orientation of the object on which spirals are attached using a camera calibration method.

     

    This thesis provides an insight into how automatic detection of spirals attached on a sheet of paper, and from this, automatic deduction of position and pose parameters of the sheet, can be achieved by using a network camera. GST algorithm has an advantage of running the processes of detection of spirals efficiently w.r.t detection performance and computational resources because it uses a spiral image model well adapted to spiral spatial frequency characteristic. We report results on how detection is affected by zoom parameters of the network camera, as well as by the GST parameters; such as filter size. After all spirals centers are located and identified w.r.t. their twist/bending parameter, a flexible technique for camera calibration, proposed by Zhengyou Zhang implemented in Matlab within the present study, is performed. The performance of the position and pose estimation in 3D is reported.

    The main conclusion is, we have reasonable surface angle estimations for images which were taken by a WLAN network camera in different conditions such as different illumination and different distances. 

  • 29.
    Albertsson, Anton
    et al.
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap.
    Skoglund, Lukas
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap.
    Rullarmering: Att adoptera en armeringsmetod2015Självständigt arbete på grundnivå (kandidatexamen), 10 poäng / 15 hpStudentuppsats (Examensarbete)
    Abstract [en]

    Rebar carpet is an innovation that favors the working environment of the rebar workers and saves time. Reinforcement workers today are a vulnerable group. Heavy lifts and backbreaking postures are a part of their everyday work. It is already established that work with rebar carpets is both time-saving, economically beneficial and from a working environment point of view better than traditional reinforcement work. Despite all benefits it is used in rather few projects today.

    The purpose of this study is to identify how the construction industry embraces new innovations related to in situ concrete with post-tensioned reinforcement. The goals are to find out how designers, contractors and manufacturers are working to adopt rebar carpets in the construction process and to shed light on, factors affecting the adoption.

    The study is based on semi-structured interviews with designers, contractors and a representative of a rebar manufacturing company.

    Designers and contractors have not, generally speaking, been actively working to adopt rebar carpet. The governing factors for the use of rebar carpets is the designers and contractors knowledge and previous experience of rebar carpet. The contractors who have previous experience of rebar carpet can imagine using rebar carpet again and contractors with no previous experience believe that they need more knowledge of rebar carpet before they dare to try. Design engineers who have designed for rebar carpet before has it in mind when they design other projects. Designers who have no previous experience of rebar carpet demand more knowledge about how they can facilitate the use of rebar carpet.

  • 30.
    Albertsson, Malin
    et al.
    Högskolan i Halmstad, Sektionen för ekonomi och teknik (SET).
    Hedman, Victoria
    Högskolan i Halmstad, Sektionen för ekonomi och teknik (SET).
    MindMe: Ett minnesstöd för en trygg och självständig vardag2009Självständigt arbete på grundnivå (högskoleexamen), 15 poäng / 22,5 hpStudentuppsats (Examensarbete)
    Abstract [sv]

    Examensprojektet MindMe har genomförts i samarbete med Niclas Jarhäll på Mutual Benefits AB, i Göteborg. Mutual Benefits AB är ett konsultbolag som levererar tekniska konsulttjänster och produkter. Detta projekt ämnar resultera i ett minneshjälpmedel avsett för personer med en kognitiv funktionsnedsättning som har medfört en nedsatt minnesfunktion. Projektet har inriktat sig på ADHD och Förvärvade hjärnskador. Projektgruppen genomförde i ett tidigt skede en studie som fann ett uttalat behov av ett minneshjälpmedel inom just dessa grupper. Studien visade också att vår målgrupp ofta förlägger sina viktiga föremål, såsom nycklar, plånbok och mobiltelefon, vilket vållar stor oro i deras vardag. Att skapa en självständig och trygg vardag är något som människor med en kognitiv funktionsnedsättning idag värderar högt. Dock är det alldeles för många hjälpmedel på dagens marknad som antingen förlöjligar användaren, eller erbjuder en för svår lösning som ej är hanterbar. En referensgrupp sattes tidigt i projektet samman med personer med en kognitiv funktionsnedsättning. Genom dessa människor erhölls de krav som ställs på ett hjälpmedel, från brukarens synvinkel, vilket projektgruppen anser viktigt. MindMe är ett minneshjälpmedel som brukaren styr från sin egna mobiltelefon. Genom en anpassad programvara samt medföljande minnen kan MindMe erbjuda brukaren ett användarvänligt och individanpassat hjälpmedel. Lösningen har genomgått både funktions- och användartester och har utvärderats av både slutkund, brukare och intressenter. Projektet har en potentiell kund för framtida distrubition genom Sveriges landsting, som även är intresserade av att lägga in kapital i MindMe´s fortsatta utveckling. Under året som examensprojektet fortlöpt har projektgruppen deltagit i affärsplanstävlingen Venture Cup, där projektgruppen i november vann ett pris för en utav de bästa regionala affärsidéerna. Det känns stimulerande att ha lyckats ta fram en produkt som tagits emot så väl av referensgrupp och intressenter. När MindMe presenteras för marknaden, vilket enligt vår affärsplan ska ske i början av år 2010, är våra förhoppningar att fler människor kommer att inse fördelen med att använda mobiltelefonen som ett hjälpmedel. Dessutom hoppas vi att MindMe kommer att erbjuda dem trygghet i deras vardag...

  • 31.
    Albinsson, John
    et al.
    Lund University.
    Brorsson, Sofia
    Högskolan i Halmstad, Sektionen för ekonomi och teknik (SET), Bio- och miljösystemforskning (BLESS), Biomekanik och biomedicin.
    Lindgren, Finn
    Lund University.
    Rydén Ahlgren, Åsa
    Lund University.
    Cinthio, Magnus
    Lund University.
    Combined use of Iteration, Quadratic Interpolation and an Extra Kernel for high-resolution 2D particle tracking: a first evaluation2010Ingår i: 2010 ieee international ultrasonics symposium, New York: IEEE Press, 2010, 2000-2003 s.Konferensbidrag (Refereegranskat)
    Abstract [en]

    A novel 2D particle tracking method, that uses 1) iteration, 2) fast quadratic sub-pixel estimation (with only 28 multiplications per movement), and 3) a previous kernel, has been evaluated and compared with a full-search block-matching method. The comparison with high-frequency ultrasound data (40 MHz) was conducted in silico and on phantoms, which comprised lateral, diagonal, and ellipsoidal movement patterns with speeds of 0–15 mm/s. The mean tracking error was reduced by 68% in silico and 71% for the phantom measurements. When only sub-pixel estimation was used, the decrease in the tracking error was 61% in silico and 57% for the phantom measurements. As well as decreasing the tracking error, the new method only used 70% of the computational time needed by the full-search block-matching method. With a fast method having good tracking ability for high-frequency ultrasound data, we now have a tool to better investigate tissue movements and its dynamic functionality.

  • 32.
    Alex, Ansu
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap.
    Comparison study of various current and potential liquid biofuels in road freight transport: Application on a case study on Transport Centralen in Halmstad2017Självständigt arbete på avancerad nivå (magisterexamen), 10 poäng / 15 hpStudentuppsats (Examensarbete)
    Abstract [en]

    The role of liquid biofuels in transportation to minimize the effects of climate change is  evident and has led to a number of studies on finding effective solutions to replace fossil fuels. Liquid biofuels are especially important for heavy duty transports as the effective ‘green’ alternatives are not as many compared to light duty vehicles; for which for e.g. electrification is an option. This thesis presents a comparison study of 8 liquid biofuels with a total of 13 different fuel pathways for use in road freight transports; both current and potential future fuels are assessed in terms of their environmental effects, fuel properties and compatibility with the heavy duty vehicle engines (see Table 10, page 36). Furthermore, a case study is performed to assess the practicality of the results of the study.  Hydro-treated vegetable oil, Bio Dimethyl ether, Liquefied Bio Methane/ ED95 are identified as fuels with considerable potential in the shorter term. Algal biofuel and Biomass to liquid (BTL) fuels from synthesis gas, if realized commercially would be a breakthrough for biofuels in overall transportation sector. However, life cycle analysis has to be performed for the different fuel pathways to completely understand the various impacting factors.

  • 33.
    Alexander, Mattsson
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap.
    Engine stability: A study of the events occurring prior to thecombustion in a small two-stroke engine2017Självständigt arbete på avancerad nivå (magisterexamen), 10 poäng / 15 hpStudentuppsats (Examensarbete)
    Abstract [en]

    This thesis is a study conducted in collaboration with the engine performance group atHusqvarna AB. The study focuses on engine stability of smaller two stroke handheld enginesrunning on E10 (10% ethanol mixture in gasoline). The reason for the study is the new EUproposition that by 2020 all fuel must have 10 % renewable fuel content. To meet thisproposition Husqvarna has evaluated E10 and found that the engine stability of smaller twostroke engines are affected in a negative way by the fuel.The study focuses on events occurring prior to the combustion and mainly the carburetor. Theobjective for the thesis is to seek what contribution the events occurring prior to thecombustion have to the engine stability and find simple and implantable solution to improvethe stability with regards to the carburetor.The study has been conducted in three different work packages, system understanding to buildknowledge of how the carburetor operates, fault finding to seek potential attributes that canaffect the stability and fault mode analysis to seek why the attributes affect the stability.Furthermore, all the attributes found has been tested and validated on the engine to seek theircontribution to the stability.The conclusion made of the thesis is that with simple and implementable improvements of thecarburetor the engine stability could be increased with 40 %. A total of five differentattributes were found to affect the stability of the engine. Furthermore, a very detailedexplanation of how the carburetor operates and components inside the carburetor has beenestablished during the thesis.

  • 34.
    Alfredsson, Emil
    et al.
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap.
    Möller, Emil
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap.
    Optimering av motorfäste2017Självständigt arbete på grundnivå (högskoleexamen), 5 poäng / 7,5 hpStudentuppsats (Examensarbete)
  • 35.
    Alhamarna, Ahmed
    et al.
    Högskolan i Halmstad, Akademin för informationsteknologi.
    Kjellgren, Simon
    Högskolan i Halmstad, Akademin för informationsteknologi.
    IDENTIFIERING AV ELEKTRONIKSKROT2017Självständigt arbete på grundnivå (högskoleexamen), 10 poäng / 15 hpStudentuppsats (Examensarbete)
    Abstract [sv]

    Denna rapport a ̈r resultatet av en underso ̈kning gjord p ̊a bega ̈ran av ett ̊ater- vinningsfo ̈retag, vars o ̈nskan var att unders ̈oka mo ̈jligheter f ̈or att effektivisera sorteringsprocessen av elektroniskt skrot i deras ̊atervinningslokal. Metoden som underso ̈ks a ̈r om RFID skulle kunna anv ̈andas f ̈or identifiering av skrotet. Projektmedlemmarna bo ̈rjade sitt arbete med att unders ̈oka om RFID var den b ̈asta identifieringsmetoden, d ̈ar f ̈or och nackdelar med olika automatiska identifikationssystem ja ̈mf ̈ordes. Slutsatsen av arbetet var att RFID skulle kunna vara en h ̊allbar lo ̈sning i framtiden fo ̈rutsatt att elektronikproducen- ter integrerar RFID taggar i sina produkter. Med tanke p ̊a att fler och fler producenter anva ̈nder RFID fo ̈r att lokalisera och identifiera sina produkter under tillverkning och det sjunkande priset p ̊a passiva taggar, ̈ar det mo ̈jligt att RFID-ma ̈rkning av produkter skulle kunna bli en standard i framtiden, b ̊ade f ̈or effektivare logistik och f ̈or en effektivare ̊atervinningsprocess. 

  • 36.
    Ali, Mustafa
    et al.
    Högskolan i Halmstad, Sektionen för Informationsvetenskap, Data– och Elektroteknik (IDE).
    Abid, Hussain
    Högskolan i Halmstad, Sektionen för Informationsvetenskap, Data– och Elektroteknik (IDE).
    Wireless and Industrial Network2013Självständigt arbete på grundnivå (kandidatexamen), 5 poäng / 7,5 hpStudentuppsats (Examensarbete)
    Abstract [en]

    The purpose of this report is to implement the wireless network in a company withtwo different sites which is located in Riga and Malmo. The main task of this reportis to implement and configure wireless industrial network. This report is based oninformation we gathered from the ABC Company about their requirements for awireless network.Requirements of this ABC Company is focusing on their infrastructure planning,security and implementing them. Benefits and drawbacks of industrial wirelessnetwork will be described briefly in this report to get some idea how ABC Companywill face the problem when they will implement their wireless network.

  • 37.
    Al-imarah, Amena
    et al.
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap.
    Stenberg, Elin
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap.
    Tillämpning av batterilager som energitjänsten lastutjämnare: En studie om batterilagring för en medelstor abonnent i Varberg Energis elnät2016Självständigt arbete på grundnivå (kandidatexamen), 10 poäng / 15 hpStudentuppsats (Examensarbete)
    Abstract [sv]

    Arbetet Tillämpning av batterilager som energitjänsten lastutjämnare är en litteraturstudie och en kvantitativ studie. I studien har driftkarakteristiken år 2015 hos en matvarubutik legat till grunden. Arbetet har syftat i att besvara frågan kring ett batterilagers lämplighet som agerade för lastutjämning. För att ta reda på det har batterilagersegenskaper kartlagts och dimensionering gjorts utifrån två olika driftfall. En ekonomisk besparingspotential har även beräknats utifrån de bägge driftfallen. Driftfallen har valts att kallas teknisk dimensionering och ekonomisk dimensionering. De tekniska dimensionerade lagerna har en lager storlek om 617 kWh och 555kWh vilket motsvarar 7,1% respektive 5,8% av den dagliga energianvändningen. För de ekonomiskt dimensionerade lagerna har en lager storlek om 597 kWh och 233kWh vilket motsvarar 6,8% respektive 2,8% av den dagliga energianvändningen. Den ekonomiska besparingspotentialen blir som störst för en blandad körning av de bägge driftfallen. Trotts att besparingspotentialen är uppskattade under ideala förhållanden med varken förluster eller degraderad prestanda lönar det inte sig att investera i ett batterilager för att enbart utföra tjänsten effektutjämning idag. Investering i ett batterilager för effektutjämning har potential att bli lönsam först när den kan tillgodose fler energitjänster eller när alternativkostnaden är förhöjd.

  • 38.
    Alinaitwe, Henry Mwanaki
    et al.
    Makerere University, Kampala, Uganda.
    Widén, Kristian
    Lund University, Lund, Sweden.
    Mwakali, Jackson
    Makerere University, Kampala, Uganda.
    Hansson, Bengt
    Lund University, Lund, Sweden.
    Innovation Barriers and Enablers that Affect Productivity in Uganda Building Industry2007Ingår i: Journal of Construction in Developing Countries, ISSN 1823-6499, E-ISSN 2180-4222, Vol. 12, nr 1, 59-75 s.Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The construction industry has of recent been blamed for lack of innovation. Lack of innovation in the industry is believed to be responsible for the decreasing or stagnant levels of productivity in comparison with other industries. This paper reviews the major barriers and enables to innovation in general. Propositions were made about the factors that affect innovation in the construction industry which were then formulated into a questionnaire. A survey was made on building contractors in Uganda, a developing country, targeting those with financial strength, large in size, and with high capacity to carry out big projects. The identified factors were then ranked and correlated. The level of training in science, engineering and technical education, and the level of research and development at the industry level are looked at as the greatest innovation enablers in building that will drive forward labour productivity. The size of the domestic market and the level of security are the worst innovation barriers that lead to low productivity in the building industry in Uganda. Contractors, policy makers and the government should address the identified factors in order to improve productivity.

  • 39.
    Alinaitwe, Henry
    et al.
    Makerere University, Kampala, Uganda.
    Widén, Kristian
    Lund University, Lund, Sweden.
    Mwakali, Jackson
    Makerere University, Kampala, Uganda.
    Hansson, Bengt
    Lund University, Lund, Sweden.
    Building firm innovation enablers and barriers affecting productivity in Mwakali and Taban-Wani2006Ingår i: Advances in Engineering and Technology: Proceedings of the First International Conference on Advances in Engineering and Technology 16-19 July 2006, Entebbe, Uganda / [ed] Jackson A. Mwakali & Gyavira Taban-Wani, Oxford: Elsevier, 2006, 268-276 s.Konferensbidrag (Refereegranskat)
  • 40.
    Alkiswani, Mutaz
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, Bio- och miljösystemforskning (BLESS), Energivetenskap.
    Spectrum conversion in solar cells industry: Novel model concept and steps towards commercialization2015Självständigt arbete på avancerad nivå (magisterexamen), 10 poäng / 15 hpStudentuppsats (Examensarbete)
    Abstract [en]

    Solar photovoltaic industry is a hot research field, massive attempts are going on all over the world to increase its productivity in different ways. One of the challenges for solar cells is the light spectrum mismatch losses, which referred to the part of solar spectrum that cannot be utilized to electricity by the conventional cells.

    Two ways have been suggested to overcome solar spectrum mismatch losses, the first is multi layered cells (tandem cells) with a different light behavior for each layer, and the second is spectrum conversion which is this researches subject.

    Spectral modification or conversion in solar cells industry has been studied and different lab scale models have been introduced. According to nanoscale journal, such technology may be the base of the next generation solar cells, mentioning specifically the use of luminescence down conversion and up conversion techniques to control the light spectrum on the solar cell, these endeavors targets to produce solar cells that is not subjugated to Shockley-Queisser maximum efficiency limit of 31%.

    This research aims to draw a map of various ideas introduced to incorporate similar technologies in solar cell products, beside further suggestion to enhance its technical behavior and to push the commercialization of the technology forward. This is expected to reveal clear image about technology’s future development map for the upcoming studies, and to create a motivation for further studies towards a commercial production scale.

    The proposed commercialized model will result in enhancing the maximum theoretical efficiency limit to 48% if all spectral mismatch loses have been eliminated. Quantum energy level diagrams have been illustrated to describe each model’s performance under a theoretical light spectrum.

  • 41.
    Allerbo, Emma
    et al.
    Högskolan i Halmstad, Sektionen för ekonomi och teknik (SET).
    Waldemarsson, Hanna
    Högskolan i Halmstad, Sektionen för ekonomi och teknik (SET).
    Adobe - Technology of Everybody: Low Cost Housing in Ethiopia2013Självständigt arbete på grundnivå (kandidatexamen), 10 poäng / 15 hpStudentuppsats (Examensarbete)
    Abstract [en]

    The traditional building techniques in Ethiopia today contain a lot of wood. Because ofdeforestation the forest cover in the country has been decreased. A part of a solution would bethe exclusion of wood in construction and then the adobe technology is a good alternative. Adobe technology involves blocks made from local soil that mixed with water and straw asreinforcement. The sundried blocks can be bricked up to walls. As mortar the same wetmixture can be used.

    This report contains analyzed soil characteristics in the high altitude located Asella region todetermine its suitability for adobe blocks. The design of a kindergarten in Alem Maya is alsocarried out.

  • 42.
    Almgren, Anna
    Högskolan i Halmstad, Sektionen för ekonomi och teknik (SET).
    Material- och tillverkningsteknikval för en stol åt Källemo2014Självständigt arbete på grundnivå (högskoleexamen), 10 poäng / 15 hpStudentuppsats (Examensarbete)
    Abstract [sv]

    Detta projekt har pågått under sista terminen på maskiningenjörsprogrammet vid högskolan i Halmstad. Projektet har utförts av en student och tillsammans med företaget Källemo. Syftet med projektet har varit att studenten ska hitta och utvärdera ett lämpligt material åt en ny stol. Materialvalet skulle också kompletteras med en lämplig tillverkningsmetod. Stolen är designad av Pierre Sindre, SandellSandberg, och kommer att produceras och säljas av Källemo. Pierre Sindres ritningar och renderingar var underlaget som var utgångspunkt för projektet. Arbetet har inneburit att olika material har utvärderats och framförallt formpressad filt. Lämpligheten har testat genom liknande referensmöbler och fysiska tester. Bland annat har provbitar testat med enkla handtester. En dialog har också förts med leverantörer av material som haft mycket erfarenhet och kunnat bidra med tips och idéer.  Då projektet inte har varit ett typiskt konstruktionsprojekt har metoden utvecklats efterhand som olika resultat uppkommit. Detta har varit ett arbetssätt som har varit väldigt lärorikt för studenten och också väldigt tidseffektivt då ingen onödig tid har lagt på irrelevanta processer. Varje steg i arbetets gång har diskuterats med både uppdragsgivaren på företaget och två handledare som högskolan tillhandahållit. Veckomöten varje vecka har också bidragit till ett mycket tidseffektivt arbete där snedsteg tidigt kunnat upptäckas av de med mer erfarenhet. Dessa möten har varit avgörande för det goda resultatet som erhållits. Resultatet består av fem lösningsförslag som tagits fram och vid diskussion med företaget och leverantörer utmynnat i ett slutligt resultat som nu är färdigt för produktion. När projektet avslutades var den första delen i produktion och således målet med projektet uppfyllt.

  • 43.
    Almgren, David
    et al.
    Högskolan i Halmstad, Akademin för informationsteknologi.
    Alshammari, Hussam
    Högskolan i Halmstad, Akademin för informationsteknologi.
    SmartBand Alert: Ett armband för säkerhet2017Självständigt arbete på grundnivå (kandidatexamen), 10 poäng / 15 hpStudentuppsats (Examensarbete)
    Abstract [en]

    Safety is a topic that is frequently discussed and spoken of in today’s society. An enhanced security for each individual is something many strive for in various industries. One of these is how to make the public feel more secure when the person in question, for example, is out walking late at night. The goal of this bachelors thesis is thus to describe and explain the product that has been developed to get ordinary people to feel more secure wherever they are. The chosen solution for this issue was hence to develop the product SmartBand Alert which consists of two parts. A bracelet and an application for IOS and Android. This bracelet should, by certain connectivity cooperate with the user’s phone to notify family members and/or others when the person thinks or knows that he or she is in danger. These persons will be notified with information about the person who has activated the alarm to simply and easily take the necessary actions to help the person. The product is designed to be used by anyone regardless of gender, age, and other characteristics individuals may hold.

  • 44.
    Almgren Mason, Suzanne
    et al.
    Högskolan i Halmstad, Sektionen för hälsa och samhälle (HOS), Centrum för samhällsanalys (CESAM), Samhällsförändring, lärande och sociala relationer (SLSR).
    Hansson, Agneta
    Högskolan i Halmstad, Sektionen för ekonomi och teknik (SET), Centrum för innovations-, entreprenörskaps- och lärandeforskning (CIEL).
    Svensson, Bertil
    Högskolan i Halmstad, Sektionen för Informationsvetenskap, Data– och Elektroteknik (IDE), Halmstad Embedded and Intelligent Systems Research (EIS).
    Börjesson, Emma
    Högskolan i Halmstad, Sektionen för Informationsvetenskap, Data– och Elektroteknik (IDE), Halmstad Embedded and Intelligent Systems Research (EIS).
    Bridging Scientific Cultures in a Regional Health Care Context2010Ingår i: VIII Triple Helix International Conference on University, Industry and Government Linkages: BOOK OF ABSTRACTS, 2010Konferensbidrag (Övrigt vetenskapligt)
    Abstract [en]

    Embedded Intelligent Systems (EIS) is the joint research field of the four collaborating laboratories at the School of Information Science, Computer and Electrical Engineering (IDE) at Halmstad University. The research of the four labs is integrated into a strong concerted research environment within embedded systems (EIS) - with a perspective reaching from the enabling technology via new system solutions and intelligent applications to end user aspects and business models. It is an expanding research area with many applications, not least ones that exist in everyday life.EIS is an important research environment contributing to the regional Triple Helix innovation system Healthcare Technology which the region has pointed out as a prioritised development sector. With its strong connections to both established and new, expanding firms hived off from the university, the research environment is active in the Healthcare Technology Alliance, a network of around sixty companies, counties and health care providers in south-western Sweden with the aim of developing the region into a leading arena for the development of health technology products and services. Several projects together with these participants concern both research and technology transfer.An integrated gender and gender equality perspective in innovations within the health technology area is necessary in order to be able to meet the needs of an ageing population with quality innovations. The relevancy of a gender perspective is clear in relation to the fact that about 70% of all those older than 75 years are women. Older women are on average cared for in hospital twice as long as men, partly due to differing disease panoramas, but also because men are more often cared for in the home by a woman while the women who live longer more often live alone. With the expansion of home-help and home nursing new needs follow and it is likely that a gender perspective will become necessary for the development of products and services that can make daily life easier for the elderly. The gender perspective also has relevance from the point of view of care staff. New technology is developed for application within the health and care sector where the larger professional groups consist mainly of women. The technology, most often designed by men, is used by women. With this in mind it is clear that an important aspect of good innovations is that the end users are involved in the innovation process.Based on an awareness of the need for a more articulated gender perspective within the research environment, in order to meet the needs expressed above, an application for a gender inclusive R&D project was handed in to the VINNOVA programme Applied Gender Research in Strong Research and Innovation Environments. The G-EIS project (Gender Perspective on Embedded Intelligent Systems - Application in Healthcare Technology) was approved and started in 2009. The project involves researchers from the EIS research environment as well as representatives from companies and the public sector.The project participants are on the whole agreed on the need for a gender perspective in the R&I environment, but struggle with the meeting of two epistemologically opposed theories of science. The understanding within gender studies that research and production both create reality and are informed by it is not always accepted within the areas of natural science. Engineering and other technological sciences not only consider aspects of science to be separate from reality, but also seek positivistic proof in research, something not always possible in the more qualitative research of the social sciences. Researching how these two perspectives meet within this specific project is the topic of this paper.

  • 45.
    Al-Mimar, Samer
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, Bio- och miljösystemforskning (BLESS), Energivetenskap. Halmstad University.
    Integration of solar and wind power at Lillgrundwind farm.: Wind turbine shadow effect on solar farm atLillgrund wind farm.2015Självständigt arbete på avancerad nivå (magisterexamen), 10 poäng / 15 hpStudentuppsats (Examensarbete)
    Abstract [en]

    The supply of energy is a key factor in modern societies. As the old fossil sources for energy are dwindling, conflicts arise between competing nations and regions. Fossil energy sources also contribute to the pollution of the environment and emission of greenhouse gases.

    With renewable energy sources many of these drawbacks with fossil fuels can be eliminated as the energy will be readily available for all without cost or environmental impact.

    Combining the renewable energy sources will be very effective, particularly in commercial areas where lake of electricity is high. The cost of combining onshore wind and solar power plant is affordable. Furthermore there is no power failure or load shedding situation at any times. When it is manufactured in a large scale, cost of this integrated natural resources power generation system is affordable. Moreover there is no power failure or load shedding situation at any times. Therefore, it is the most reliable renewable power or electricity resources with less spending and highly effective production. ref [1].

    The thesis work would take planning of offshore renewable plant (Lillgrund) with considering the resources of renewable power. The study would take in account combining the Lillgrund wind farm with solar system and take close look into the advantage and disadvantage of combining the renewable resources together and figure out if such station can work in proper way and provide sufficient power production. The study would take in account the effect of each resource on other resource, also calculations would be done.

    The study site is Lillgrund in south of Sweden. The Lillgrund wind farm is the most important offshore wind power plant installed in Sweden with a total capacity of 110 MW, corresponding to 48 turbines. ref [2].

  • 46.
    AlNasseri, Hammad Abdullah
    et al.
    Lund University, Lund, Sweden.
    Widén, Kristian
    Lund University, Lund, Sweden.
    Aulin, Radhlinah
    Lund University, Lund, Sweden.
    Towards a Taxonomy of Planning and Scheduling Methods in the Context of Construction Management2013Ingår i: Proceedings from 7th Nordic Conference On Construction Economics And Organisation 2013: Green Urbanisation – Implications For Value Creation / [ed] Ole Jonny Klakegg, Kari Hovin Kjølle, Cecilie G. Mehaug, Nils O.E. Olsson, Asmamaw T. Shiferaw & Ruth Woods, Trondheim: Akademika forlag, 2013, 570-581 s.Konferensbidrag (Refereegranskat)
    Abstract [en]

    Planning and scheduling are considered as one of the most difficult but most important processes from perspectives of project management. These processes involve implementation of a widerange of planning methods used by different organizations with various levels of planning knowledge. The planning methods for scheduling can be classified as traditional methods (e.g. line of balance, Gantt chart and critical path) and modern methods (e.g. last planner and critical chain). Over time these methods had advanced from paper based to computer based. However, some project planners still prefer using the traditional methods despite other new alternatives. Users of those methods have different perspectives about the efficiency and effectiveness of the different planning methods used to manage different projects. Evidences from the secondary data found from extensive literatures have been used to assess the planning and scheduling methods mentioned above. A taxonomy describing each of the method in terms of their theories, key features, application areas, benefits and limitations is presented. The preliminary outcome of this paper may provide a tool to aid organizations in selecting and prioritizing the most appropriate methods to be developed and implemented in planning and scheduling of their projects. It also initializes a theoretical base for more rapid taxonomy studies on the use of different planning and scheduling approaches. As an overall, the present paper reminds practitioners of common ground about its important insights on how such taxonomy studies have potential to make scope of those methods and tools clearer, especially when they compare among them within the same application contexts.

  • 47.
    Alonso-Fernandez, Fernando
    et al.
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS), CAISR Centrum för tillämpade intelligenta system (IS-lab).
    Bigun, Josef
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS), CAISR Centrum för tillämpade intelligenta system (IS-lab).
    A survey on periocular biometrics research2016Ingår i: Pattern Recognition Letters, ISSN 0167-8655, E-ISSN 1872-7344, Vol. 82, part 2, 92-105 s.Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Periocular refers to the facial region in the vicinity of the eye, including eyelids, lashes and eyebrows. While face and irises have been extensively studied, the periocular region has emerged as a promising trait for unconstrained biometrics, following demands for increased robustness of face or iris systems. With a surprisingly high discrimination ability, this region can be easily obtained with existing setups for face and iris, and the requirement of user cooperation can be relaxed, thus facilitating the interaction with biometric systems. It is also available over a wide range of distances even when the iris texture cannot be reliably obtained (low resolution) or under partial face occlusion (close distances). Here, we review the state of the art in periocular biometrics research. A number of aspects are described, including: (i) existing databases, (ii) algorithms for periocular detection and/or segmentation, (iii) features employed for recognition, (iv) identification of the most discriminative regions of the periocular area, (v) comparison with iris and face modalities, (vi) soft-biometrics (gender/ethnicity classification), and (vii) impact of gender transformation and plastic surgery on the recognition accuracy. This work is expected to provide an insight of the most relevant issues in periocular biometrics, giving a comprehensive coverage of the existing literature and current state of the art. © 2015 Elsevier B.V. All rights reserved.

  • 48.
    Alonso-Fernandez, Fernando
    et al.
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS), CAISR Centrum för tillämpade intelligenta system (IS-lab).
    Bigun, Josef
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS), CAISR Centrum för tillämpade intelligenta system (IS-lab).
    Best Regions for Periocular Recognition with NIR and Visible Images2014Ingår i: 2014 IEEE International Conference on Image Processing (ICIP), Piscataway, NJ: IEEE Press, 2014, 4987-4991 s.Konferensbidrag (Refereegranskat)
    Abstract [en]

    We evaluate the most useful regions for periocular recognition. For this purpose, we employ our periocular algorithm based on retinotopic sampling grids and Gabor analysis of the spectrum. We use both NIR and visible iris images. The best regions are selected via Sequential Forward Floating Selection (SFFS). The iris neighborhood (including sclera and eyelashes) is found as the best region with NIR data, while the surrounding skin texture (which is over-illuminated in NIR images) is the most discriminative region in visible range. To the best of our knowledge, only one work in the literature has evaluated the influence of different regions in the performance of periocular recognition algorithms. Our results are in the same line, despite the use of completely different matchers. We also evaluate an iris texture matcher, providing fusion results with our periocular system as well. © 2014 IEEE.

  • 49.
    Alonso-Fernandez, Fernando
    et al.
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS), CAISR Centrum för tillämpade intelligenta system (IS-lab).
    Bigun, Josef
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS), CAISR Centrum för tillämpade intelligenta system (IS-lab).
    Biometric Recognition Using Periocular Images2013Konferensbidrag (Övrigt vetenskapligt)
    Abstract [en]

    We present a new system for biometric recognition using periocular images based on retinotopic sampling grids and Gabor analysis of the local power spectrum at different frequencies and orientations. A number of aspects are studied, including: 1) grid adaptation to dimensions of the target eye vs. grids of constant size, 2) comparison between circular- and rectangular-shaped grids, 3) use of Gabor magnitude vs. phase vectors for recognition, and 4) rotation compensation between query and test images. Results show that our system achieves competitive verification rates compared with other periocular recognition approaches. We also show that top verification rates can be obtained without rotation compensation, thus allowing to remove this step for computational efficiency. Also, the performance is not affected substantially if we use a grid of fixed dimensions, or it is even better in certain situations, avoiding the need of accurate detection of the iris region.

  • 50.
    Alonso-Fernandez, Fernando
    et al.
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS), CAISR Centrum för tillämpade intelligenta system (IS-lab).
    Bigun, Josef
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS), CAISR Centrum för tillämpade intelligenta system (IS-lab).
    Exploting Periocular and RGB Information in Fake Iris Detection2014Ingår i: 2014 37th International Conventionon Information and Communication Technology, Electronics and Microelectronics (MIPRO): 26 – 30 May 2014 Opatija, Croatia: Proceedings / [ed] Petar Biljanovic, Zeljko Butkovic, Karolj Skala, Stjepan Golubic, Marina Cicin-Sain, Vlado Sruk, Slobodan Ribaric, Stjepan Gros, Boris Vrdoljak, Mladen Mauher & Goran Cetusic, Rijeka: Croatian Society for Information and Communication Technology, Electronics and Microelectronics - MIPRO , 2014, 1354-1359 s.Konferensbidrag (Refereegranskat)
    Abstract [en]

    Fake iris detection has been studied by several researchers. However, to date, the experimental setup has been limited to near-infrared (NIR) sensors, which provide grey-scale images. This work makes use of images captured in visible range with color (RGB) information. We employ Gray-Level CoOccurrence textural features and SVM classifiers for the task of fake iris detection. The best features are selected with the Sequential Forward Floating Selection (SFFS) algorithm. To the best of our knowledge, this is the first work evaluating spoofing attack using color iris images in visible range. Our results demonstrate that the use of features from the three color channels clearly outperform the accuracy obtained from the luminance (gray scale) image. Also, the R channel is found to be the best individual channel. Lastly, we analyze the effect of extracting features from selected (eye or periocular) regions only. The best performance is obtained when GLCM features are extracted from the whole image, highlighting that both the iris and the surrounding periocular region are relevant for fake iris detection. An added advantage is that no accurate iris segmentation is needed. This work is relevant due to the increasing prevalence of more relaxed scenarios where iris acquisition using NIR light is unfeasible (e.g. distant acquisition or mobile devices), which are putting high pressure in the development of algorithms capable of working with visible light. © 2014 MIPRO.

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