hh.sePublikationer
Ändra sökning
Avgränsa sökresultatet
45678910 301 - 350 av 1325
RefereraExporteraLänk till träfflistan
Permanent länk
Referera
Referensformat
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Annat format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annat språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf
Träffar per sida
  • 5
  • 10
  • 20
  • 50
  • 100
  • 250
Sortering
  • Standard (Relevans)
  • Författare A-Ö
  • Författare Ö-A
  • Titel A-Ö
  • Titel Ö-A
  • Publikationstyp A-Ö
  • Publikationstyp Ö-A
  • Äldst först
  • Nyast först
  • Skapad (Äldst först)
  • Skapad (Nyast först)
  • Senast uppdaterad (Äldst först)
  • Senast uppdaterad (Nyast först)
  • Disputationsdatum (tidigaste först)
  • Disputationsdatum (senaste först)
  • Standard (Relevans)
  • Författare A-Ö
  • Författare Ö-A
  • Titel A-Ö
  • Titel Ö-A
  • Publikationstyp A-Ö
  • Publikationstyp Ö-A
  • Äldst först
  • Nyast först
  • Skapad (Äldst först)
  • Skapad (Nyast först)
  • Senast uppdaterad (Äldst först)
  • Senast uppdaterad (Nyast först)
  • Disputationsdatum (tidigaste först)
  • Disputationsdatum (senaste först)
Markera
Maxantalet träffar du kan exportera från sökgränssnittet är 250. Vid större uttag använd dig av utsökningar.
  • 301.
    Cooney, Martin
    et al.
    Hiroshi Ishiguro Lab (HIL), Advanced Telecommunications Research Institute International (ATR), Seika, Japan.
    Nishio, Shuichi
    Hiroshi Ishiguro Lab (HIL), Advanced Telecommunications Research Institute International (ATR), Seika, Japan.
    Ishiguro, Hiroshi
    Hiroshi Ishiguro Lab (HIL), Advanced Telecommunications Research Institute International (ATR), Seika, Japan.
    Affectionate Interaction with a Small Humanoid Robot Capable of Recognizing Social Touch Behavior2014Ingår i: ACM Transactions on Interactive Intelligent Systems, ISSN 2160-6455, Vol. 4, nr 4, artikel-id 19Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Activity recognition, involving a capability to recognize people’s behavior and its underlying significance, will play a crucial role in facilitating the integration of interactive robotic artifacts into everyday human environments. In particular, social intelligence in recognizing affectionate behavior will offer value by allowing companion robots to bond meaningfully with interacting persons. The current article addresses the issue of designing an affectionate haptic interaction between a person and a companion robot by exploring how a small humanoid robot can behave to elicit affection while recognizing touches. We report on an experiment conducted to gain insight into how people perceive three fundamental interactive strategies in which a robot is either always highly affectionate, appropriately affectionate, or superficially unaffectionate (emphasizing positivity, contingency, and challenge, respectively). Results provide insight into the structure of affectionate interaction between humans and humanoid robots—underlining the importance of an interaction design expressing sincere liking, stability and variation—and suggest the usefulness of novel modalities such as warmth and cold. © 2014 ACM.

  • 302.
    Cooney, Martin
    et al.
    Advanced Telecommunications Research Institute International (ATR) Hiroshi Ishiguro Lab (HIL), 2-2-2 Hikaridai, Keihanna Science City, Kyoto 619-0288, Japan & Department of Systems Innovation, Osaka University, 1-3 Machikaneyama, Toyonaka, Osaka 560-8531, Japan.
    Nishio, Shuichi
    Advanced Telecommunications Research Institute International (ATR) Hiroshi Ishiguro Lab (HIL), 2-2-2 Hikaridai, Keihanna Science City, Kyoto 619-0288, Japan.
    Ishiguro, Hiroshi
    Advanced Telecommunications Research Institute International (ATR) Hiroshi Ishiguro Lab (HIL), 2-2-2 Hikaridai, Keihanna Science City, Kyoto 619-0288, Japan & Department of Systems Innovation, Osaka University, 1-3 Machikaneyama, Toyonaka, Osaka 560-8531, Japan.
    Designing Robots for Well-being: Theoretical Background and Visual Scenes of Affectionate Play with a Small Humanoid Robot2014Ingår i: Lovotics, ISSN 2090-9888, Vol. 1, nr 1, artikel-id 1000101Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Social well-being, referring to a subjectively perceived long-term state of happiness, life satisfaction, health, and other prosperity afforded by social interactions, is increasingly being employed to rate the success of human social systems. Although short-term changes in well-being can be difficult to measure directly, two important determinants can be assessed: perceived enjoyment and affection from relationships. The current article chronicles our work over several years toward achieving enjoyable and affectionate interactions with robots, with the aim of contributing to the perception of social well-being in interacting persons. Emphasis has been placed on both describing in detail the theoretical basis underlying our work, and relating the story of each of several designs from idea to evaluation in a visual fashion. For the latter, we trace the course of designing four different robotic artifacts intended to further our understanding of how to provide enjoyment, elicit affection, and realize one specific scenario for affectionate play. As a result, by describing (a) how perceived enjoyment and affection contribute to social well-being, and (b) how a small humanoid robot can proactively engage in enjoyable and affectionate play—recognizing people’s behavior and leveraging this knowledge—the current article informs the design of companion robots intended to facilitate a perception of social well-being in interacting persons during affectionate play.

  • 303.
    Cooney, Martin
    et al.
    Hiroshi Ishiguro Laboratory, Advanced Telecommunications, Research Institute International (ATR), 2-2-2 Hikaridai, Keihanna Science City, Kyoto 619-0288, Japan & Department of Systems Innovation, Graduate School of Engineering Science, Osaka University, 1-3 Machikaneyama, Toyonaka, Osaka, Japan.
    Nishio, Shuichi
    Hiroshi Ishiguro Laboratory, Advanced Telecommunications, Research Institute International (ATR), 2-2-2 Hikaridai, Keihanna Science City, Kyoto, Japan.
    Ishiguro, Hiroshi
    Hiroshi Ishiguro Laboratory, Advanced Telecommunications, Research Institute International (ATR), 2-2-2 Hikaridai, Keihanna Science City, Kyoto 619-0288, Japan Department of Systems Innovation, Graduate School of Engineering Science, Osaka University, 1-3 Machikaneyama, Toyonaka, Osaka, Japan.
    Importance of Touch for Conveying Affection in a Multimodal Interaction with a Small Humanoid Robot2015Ingår i: International Journal of Humanoid Robotics, ISSN 0219-8436, Vol. 12, nr 1, artikel-id 1550002Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    To be accepted as a part of our everyday lives, companion robots will require the capability to communicate socially, recognizing people's behavior and responding appropriately. In particular, we hypothesized that a humanoid robot should be able to recognize affectionate touches conveying liking or dislike because (a) a humanoid form elicits expectations of a high degree of social intelligence, (b) touch behavior plays a fundamental and crucial role in human bonding, and (c) robotic responses providing affection could contribute to people's quality of life. The hypothesis that people will seek to affectionately touch a robot needed to be verified because robots are typically not soft or warm like humans, and people can communicate through various other modalities such as vision and sound. The main challenge faced was that people's social norms are highly complex, involving behavior in multiple channels. To deal with this challenge, we adopted an approach in which we analyzed free interactions and also asked participants to rate short video-clips depicting human–robot interaction. As a result, we verified that touch plays an important part in the communication of affection from a person to a humanoid robot considered capable of recognizing cues in touch, vision, and sound. Our results suggest that designers of affectionate interactions with a humanoid robot should not ignore the fundamental modality of touch.

  • 304.
    Cooney, Martin
    et al.
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS), CAISR Centrum för tillämpade intelligenta system (IS-lab).
    Pashami, Sepideh
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS), CAISR Centrum för tillämpade intelligenta system (IS-lab).
    Pinheiro Sant'Anna, Anita
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS), CAISR Centrum för tillämpade intelligenta system (IS-lab).
    Fan, Yuantao
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS), CAISR Centrum för tillämpade intelligenta system (IS-lab).
    Nowaczyk, Sławomir
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS), CAISR Centrum för tillämpade intelligenta system (IS-lab).
    Pitfalls of Affective Computing: How can the automatic visual communication of emotions lead to harm, and what can be done to mitigate such risks?2018Ingår i: WWW '18 Companion Proceedings of the The Web Conference 2018, New York, NY: ACM Publications, 2018, s. 1563-1566Konferensbidrag (Refereegranskat)
    Abstract [en]

    What would happen in a world where people could "see'' others' hidden emotions directly through some visualizing technology Would lies become uncommon and would we understand each other better Or to the contrary, would such forced honesty make it impossible for a society to exist The science fiction television show Black Mirror has exposed a number of darker scenarios in which such futuristic technologies, by blurring the lines of what is private and what is not, could also catalyze suffering. Thus, the current paper first turns an eye towards identifying some potential pitfalls in emotion visualization which could lead to psychological or physical harm, miscommunication, and disempowerment. Then, some countermeasures are proposed and discussed--including some level of control over what is visualized and provision of suitably rich emotional information comprising intentions--toward facilitating a future in which emotion visualization could contribute toward people's well-being. The scenarios presented here are not limited to web technologies, since one typically thinks about emotion recognition primarily in the context of direct contact. However, as interfaces develop beyond today's keyboard and monitor, more information becomes available also at a distance--for example, speech-to-text software could evolve to annotate any dictated text with a speaker's emotional state.

    Ladda ner fulltext (pdf)
    fulltext
  • 305.
    Cooney, Martin
    et al.
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS), CAISR Centrum för tillämpade intelligenta system (IS-lab).
    Yang, Can
    Högskolan i Halmstad, Akademin för informationsteknologi.
    Padi Siva, Abhilash
    Högskolan i Halmstad, Akademin för informationsteknologi.
    Arunesh, Sanjana
    Högskolan i Halmstad, Akademin för informationsteknologi.
    David, Jennifer
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS), CAISR Centrum för tillämpade intelligenta system (IS-lab).
    Teaching Robotics with Robot Operating System (ROS): A Behavior Model Perspective2018Ingår i: CEUR Workshop Proceedings, Aachen: Rheinisch-Westfaelische Technische Hochschule Aachen , 2018, Vol. 2329, s. 59-68Konferensbidrag (Refereegranskat)
    Abstract [en]

    Robotics skills are in high demand, but learning robotics can be difficult due to the wide range of required knowledge, increasingly complex and diverse platforms, and components requiring dedicated software. One way to mitigate such problems is by utilizing a standard framework such as Robot Operating System (ROS), which facilitates development through the reuse of opensource code—a challenge is that learning curves can be steep for students who are also first-time users. In the current paper, we suggest the use of a behavior model to structure the learning of complex frameworks like ROS in an engaging way. A practical example is provided, of integrating ROS into a robotics course called the “Design of Embedded and Intelligent Systems” (DEIS), along with feedback suggesting that some students responded positively to learning experiences enabled by our approach. Furthermore, some course materials, videos, and code have been made available online, which we hope might provide useful insights. © 2018 CEUR-WS. All Rights Reserved.

    Ladda ner fulltext (pdf)
    fulltext
  • 306.
    Cristofer, Englund
    et al.
    Viktoria Swedish ICT, Gothenburg, Sweden.
    Chen, Lei
    Viktoria Swedish ICT, Gothenburg, Sweden.
    Vinel, Alexey
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS), Centrum för forskning om inbyggda system (CERES).
    Lin, Shih-Yang
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS), Centrum för forskning om inbyggda system (CERES).
    Future Applications of VANETs2015Ingår i: Vehicular Ad Hoc Networks: Standards, Solutions, and Research / [ed] Claudia Campolo, Antonella Molinaro & Riccardo Scopigno, Cham: Springer Publishing Company, 2015, s. 525-544Kapitel i bok, del av antologi (Refereegranskat)
    Abstract [en]

    Current transportation systems face great challenges due to the increasing mobility. Traffic accidents, congestion, air pollution, etc., are all calling for new methods to improve the transportation system. With the US legislation in progress over vehicle communications and EU’s finalization of the basic set of standards over cooperative intelligent transportation systems (C-ITS), vehicular ad hoc network (VANET) based applications are expected to address those challenges and provide solutions for a safer, more efficient and sustainable future intelligent transportation systems (ITS). In this chapter, transportation challenges are firstly summarized in respect of safety, efficiency, environmental threat, etc. A brief introduction of the VANET is discussed along with state of the art of VANET-based applications. Based on the current progress and the development trend of VANET, a number of new features of future VANET are identified, together with a set of potential future ITS applications. The on-going research and field operational test projects, which are the major enabling efforts for the future VANET-based C-ITS, are presented. The chapter is of great interest to readers working within ITS for current development status and future trend within the C-ITS area. It is also of interest to general public for an overview of the VANET enabled future transportation system. © Springer International Publishing Switzerland 2015.

  • 307.
    Daher, Robil
    et al.
    Rostock University, Rostock, Germany.
    Vinel, AlexeyDepartment of Communications Engineering, Tampere University of Technology, Tampere, Finland.
    Roadside Networks for Vehicular Communications: Architectures, Applications, and Test Fields2012Samlingsverk (redaktörskap) (Refereegranskat)
    Abstract [en]

    Vehicular Communication Networks (VCNs) is a technology aim for improving traffic safety and efficiency in different road systems and networks. VCNs offer an efficient communication platform for intelligent transportation systems and related services, as well as multimedia and date services.

    Roadside Networks for Vehicular Communications: Architectures, Applications, and Test Fields attempts to close the gap between science and technology in the field of roadside backbones for VCNs. This collection will be useful not only for researchers and engineers at universities, but for students in the fields of wireless communication networks, especially vehicular communication networks, and backbone networks as well.

  • 308.
    Dahl, Oskar
    et al.
    Högskolan i Halmstad, Akademin för informationsteknologi.
    Johansson, Fredrik
    Högskolan i Halmstad, Akademin för informationsteknologi.
    Understanding usage of Volvo trucks2019Självständigt arbete på avancerad nivå (yrkesexamen), 20 poäng / 30 hpStudentuppsats (Examensarbete)
    Abstract [en]

    Trucks are designed, configured and marketed for various working environments. There lies a concern whether trucks are used as intended by the manufacturer, as usage may impact the longevity, efficiency and productivity of the trucks.

    In this thesis we propose a framework divided into two separate parts, that aims to extract costumers’ driving behaviours from Logged Vehicle Data (LVD) in order to a): evaluate whether they align with so-called Global Transport Application (GTA) parameters and b): evaluate the usage in terms of performance. Gaussian mixture model (GMM) is employed to cluster and classify various driving behaviors. Association rule mining was applied on the categorized clusters to validate that the usage follow GTA configuration. Furthermore, Correlation Coefficient (CC) was used to find linear relationships between usage and performance in terms of Fuel Consumption (FC).

    It is found that the vast majority of the trucks seemingly follow GTA parameters, thus used as marketed. Likewise, the fuel economy was found to be linearly dependent with drivers’ various performances.

    The LVD lacks detail, such as Global Positioning System (GPS) information, needed to capture the usage in such a way that more definitive conclusions can be drawn.

    Ladda ner fulltext (pdf)
    fulltext
  • 309.
    Dahlgren, Patrik
    et al.
    Högskolan i Halmstad, Sektionen för Informationsvetenskap, Data– och Elektroteknik (IDE).
    Heehrle, Emil
    Högskolan i Halmstad, Sektionen för Informationsvetenskap, Data– och Elektroteknik (IDE).
    Persson, Jim
    Högskolan i Halmstad, Sektionen för Informationsvetenskap, Data– och Elektroteknik (IDE).
    Analys av Örkelljunga Utbildningscentrums IT-miljö2013Självständigt arbete på grundnivå (kandidatexamen), 10 poäng / 15 hpStudentuppsats (Examensarbete)
    Abstract [sv]

    I dagens samhälle där tillgången till information är nästintill obegränsad och nätverkfinns överallt ökar kraven på IT-säkerhet. Gratis programvaror och information omhur man använder dessa finns enkelt tillgängliga för vem som helst på Internet idag.Då många av dessa programsviter har full support och de är mycket användarvänligainnebär det också att fler kan utföra intrång och attacker mot olika IT-miljöer utanatt behöva inneha expertis inom området. Ett hjälpmedel mot dessa hot ärpenetrationstesting, där man kan identifiera eventuella brister och sårbarheter i ettgivet IT-system.Den här rapportens mål har varit att utreda om Örkelljunga Utbildningscentrums ITsäkerhetstår i proportion till känsligheten på informationen som de innehar ochbehandlar.Detta har gjorts genom ett penetrationstest, där man på plats har skannat skolansnätverk efter sårbarheter och möjliga intrångsvägar.Därefter har sårbarheterna utvärderats och rankats efter hur kritiska de anses varaoch utifrån detta teoretiskt bevisat hur man som attackerare hade kunnat gå till vägaför att komma åt eller förstöra känslig information.Resultaten visade på ett flertal kritiska brister som vid närmare analys hade kunnatutnyttjas för att ta sig in i systemet och eventuellt komma åt känslig information.Slutsats blev därför att Örkelljunga Utbildningscentrums IT-miljö för närvarande intehar tillräcklig säkerhet i proportion till känsligheten på information som de innehar.

    Ladda ner fulltext (pdf)
    fulltext
  • 310.
    Dalati, Fares
    et al.
    Högskolan i Halmstad, Akademin för informationsteknologi.
    Martinez Lopez, Pablo Enrique
    Högskolan i Halmstad, Akademin för informationsteknologi.
    Vital Sign Radar Redesign: Further Development of a Compact, Highly integrated 60 GHz Radar for Human Vital Sign Monitoring2017Självständigt arbete på avancerad nivå (magisterexamen), 10 poäng / 15 hpStudentuppsats (Examensarbete)
    Abstract [en]

    Nowadays, thanks to the modern technologies, the human being has been able todevelop new techniques to solve problems present in the past. Regarding the medicalfield, it is common to use several apparatus in order to measure the vital signs. Themain drawback about the traditional methods employed for this purpose is that theyare invasive towards the patient. However, in this thesis it has been developed afurther design of a radar system so as to be able to measure these vital signs in awireless way.

    Based on a 60 GHz frequency modulated continuous wave radar chip, it has been ableto increase the performance of the measurements by adding a second radar chip.Because of this new feature, the radar system is now having a better precision byprocessing greater data matrix to analyse the targets positions and theirmeasurements. In addition, an enhanced MCU has been incorporated in order toavoid performance bottlenecks because it is necessary to handle the processing of thedata received by the two radar chips. Lastly, reducing the sweeping time (periodbetween the lowest frequency broadcast to linearly reach the highest frequencybroadcast) from 20 ms the previous design to 1 ms, which requires higher samplingrate to cover the fast sweep and provide higher flow of information that leads to fasterdetection process.

    A 3D design of the prototype has been designed to show the physical appearance itwould have once entering in production. The result is a compact and highlyintegrated radar system which will be able to monitor the heart beating andrespiration frequency of a human being in a range of ten meters.

    Ladda ner fulltext (pdf)
    fulltext
  • 311.
    D'Ambrosio, Marco
    et al.
    Högskolan i Halmstad, Sektionen för ekonomi och teknik (SET). Högskolan i Halmstad, Sektionen för ekonomi och teknik (SET), Bio- och miljösystemforskning (BLESS), Energiteknik.
    Medaglia, Marco
    Högskolan i Halmstad, Sektionen för ekonomi och teknik (SET). Högskolan i Halmstad, Sektionen för ekonomi och teknik (SET), Bio- och miljösystemforskning (BLESS), Energiteknik.
    Vertical Axis Wind Turbines: History, Technology and Applications2010Självständigt arbete på avancerad nivå (masterexamen), 15 poäng / 22,5 hpStudentuppsats (Examensarbete)
    Abstract [en]

    In  this  Master Thesis  a  review  of  different  type  of  vertical  axis  wind turbines (VAWT)  and  a preliminary investigation of a new kind of VAWT are presented.

    After an introduction about the historical background of wind power, the report deals with a more accurate analysis of the main type of VAWT, showing their characteristics and their operations. The aerodynamics of the wind turbines and a review of different type on generators that can be used to connect the wind mill to the electricity grid are reported as well.

    Several statistics are also presented, in order to explain how the importance of the wind energy has grown  up  during  the  last  decades  and  also  to  show  that  this development  of  the  market  of  wind power  creates  new  opportunity  also  for VAWT,  that  are  less  used  than  the  horizontal  axis  wind turbine (HAWT).

    In the end of 2009 a new kind of vertical axis wind turbine, a giromill 3 blades type, has been built in Falkenberg, by the Swedish company VerticalWind. The tower of this wind turbine is made by wood,  in  order  to  get  a  cheaper  and  more environment  friendly  structure,  and  a  direct  driven synchronous multipole with permanent magnents generator is located at its bottom. This 200 kW VAWT represents the intermediate step between the 12 kW prototype, built in collaboration with the Uppsala University, and the common Swedish commercial size of 2 MW, which is the goal of the company.

    A  preliminary  investigation  of  the  characteristics  of  this  VAWT  has  been done, focusing  in particular on the value of the frequency of resonance of the tower, an important value that must be never reached during the operative phase in order to avoid serious damage to all the structure, and on the power curve, used to evaluate the coefficient of power (Cp) of the turbine. The results of this investigation and  the steps  followed  to  get  them  are  reported.  Moreover  a  energy production analysis of the turbine has been done using WindPro, as well as a comparison with and older type on commercial VAWT.

    Ladda ner fulltext (pdf)
    FULLTEXT01
  • 312.
    Dankers, Wouter
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS), Centrum för forskning om inbyggda system (CERES).
    Learning wireless channel models to design real-time communications from vehicles2018Självständigt arbete på avancerad nivå (masterexamen), 80 poäng / 120 hpStudentuppsats (Examensarbete)
    Abstract [en]

    The aim of this project is to analyze a data log of wireless packet traffic, and to produce: (1) models for dynamic fluctuations in wireless channel and link quality, and, (2) a design for real-time communications over the given wireless channel. The models and designs are useful in setting up real-time communications in a vehicular test track (www.astazero.com). The data log came from experimental measurements at the test track. From this data, we fitted simple models for packet losses and retransmissions in the wireless communication system. These models took the form of a combination of a statistical model for the packet losses, with a deterministic model for retransmissions of lost packets. Such fitted models can be used to predict the average quality of vehicle position monitoring based on periodically transmitted position information. Such predictions help us decide the feasibility of safe and reliable conduct of testing with two or more moving test objects.

    Ladda ner fulltext (pdf)
    fulltext
  • 313.
    Danqing, Ni
    et al.
    Högskolan i Halmstad, Sektionen för Informationsvetenskap, Data– och Elektroteknik (IDE), Halmstad Embedded and Intelligent Systems Research (EIS).
    Zao, Sun
    Högskolan i Halmstad, Sektionen för Informationsvetenskap, Data– och Elektroteknik (IDE), Halmstad Embedded and Intelligent Systems Research (EIS).
    Junwei, Chen
    Högskolan i Halmstad, Sektionen för Informationsvetenskap, Data– och Elektroteknik (IDE), Halmstad Embedded and Intelligent Systems Research (EIS).
    On Time Discrete Simulation of cooperative Vehicle's Kinematic Behaviour2012Självständigt arbete på avancerad nivå (masterexamen), 20 poäng / 30 hpStudentuppsats (Examensarbete)
    Abstract [en]

    The vehicle plays an important role in peoples life in modern times. The vehi- cle's behaviour is a complex and detailed subject, which requiring the knowledge of mathematics and physics. Meanwhile, the vehicles' behaviour is aected by a lot of dierent conditions, such as the driver and the environment. For the purpose of trac safety, simulation is required to analyze the vehicles' behaviour. Vari- eties of behaviour models, based on dierent levels (Macroscopic, Mesoscopic and Microscopic) have been presented. Vehicles are able to interact with each other through the Vehicular Ad Hoc Network (VANET). It is worthwhile to simulate how the behaviour is aected by an exchange of kinematic data. This thesis presents a new simulator, which is designed at microscopic level, based on the graph theory. Not only dierent vehicles' behaviour, but also coop- eration between vehicles can be implemented in the simulator. A new model of collision avoidance is created, incorporating the concept of kinematics and human emulation. The car-following model is also performed for the formation of trac

    ow. Overall, the modeling in the simulator is simplied by ignoring the network disturbances. The data collected from the results of the simulation is used to display a scenario as visualization of a vehicles behaviour.

    Ladda ner fulltext (pdf)
    On Time Discrete Simulation Cooperative Vehicle's Kinematic Behaviour
  • 314.
    David, Jennifer
    et al.
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS), CAISR Centrum för tillämpade intelligenta system (IS-lab).
    Mostowski, Wojciech
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS), Centrum för forskning om inbyggda system (CERES).
    Aramrattna, Maytheewat
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS), Centrum för forskning om inbyggda system (CERES).
    Fan, Yuantao
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS), CAISR Centrum för tillämpade intelligenta system (IS-lab).
    Varshosaz, Mahsa
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS), Centrum för forskning om inbyggda system (CERES).
    Karlsson, Patrick
    Högskolan i Halmstad, Akademin för informationsteknologi.
    Roden, Marcus
    Högskolan i Halmstad, Akademin för informationsteknologi.
    Bogga, Anders
    Högskolan i Halmstad, Akademin för informationsteknologi.
    Carlsen, Jakob
    Högskolan i Halmstad, Akademin för informationsteknologi.
    Johansson, Emil
    Högskolan i Halmstad, Akademin för informationsteknologi.
    Andersson, Emil
    Högskolan i Halmstad, Akademin för informationsteknologi.
    Design and Development of a Hexacopter for the Search and Rescue of a Lost Drone2019Konferensbidrag (Refereegranskat)
    Abstract [en]

    Search and rescue with an autonomous robot is an attractive and challenging task within the research community. This paper presents the development of an autonomous hexacopter that is designed for retrieving a lost object, like a drone, from a vast-open space, like a desert area. Navigating its path with a proposed coverage path planning strategy, the hexacopter can efficiently search for a lost target and locate it using an image-based object detection algorithm. Moreover, after the target is located, our hexacopter can grasp it with a customised gripper and transport it back to a destined location. It is also capable of avoiding static obstacles and dynamic objects. The proposed system was realised in simulations before implementing it in a real hardware setup, i.e. assembly of the drone, crafting of the gripper, software implementation and testing under real-world scenarios. The designed hexacopter won the best UAV design award at the CPS-VO 2018 Competition held in Arizona, USA.

    Ladda ner fulltext (pdf)
    fulltext
  • 315.
    David, Jennifer
    et al.
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS), CAISR Centrum för tillämpade intelligenta system (IS-lab).
    Philippsen, Roland
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS), CAISR Centrum för tillämpade intelligenta system (IS-lab).
    Task assignment and trajectory planning in dynamic environments for multiple vehicles2015Ingår i: Frontiers in Artificial Intelligence and Applications, ISSN 0922-6389, E-ISSN 1879-8314, Vol. 278, s. 179-181Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    We consider the problem of finding collision-free trajectories for a fleet of automated guided vehicles (AGVs) working in ship ports and freight terminals. Our solution computes collision-free trajectories for a fleet of AGVs to pick up one or more containers and transport it to a given goal without colliding with other AGVs and obstacles. We propose an integrated framework for solving the goal assignment and trajectory planning problem minimizing the maximum cost over all vehicle trajectories using the classical Hungarian algorithm. To deal with the dynamics in the environment, we refine our final trajectories with CHOMP (Covariant Hamiltonian optimization for motion planning) in order to trade off between path smoothness and dynamic obstacle avoidance. © 2015 The authors and IOS Press. All rights reserved.

  • 316.
    David, Jennifer
    et al.
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS), CAISR Centrum för tillämpade intelligenta system (IS-lab).
    Valencia, Rafael
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS), CAISR Centrum för tillämpade intelligenta system (IS-lab).
    Iagnemma, Karl
    Massachusetts Institute of Technology, Cambridge, MA, USA.
    Task Assignment and Trajectory Planning in Dynamic environments for Multiple Vehicles2016Konferensbidrag (Refereegranskat)
    Abstract [en]

    We consider the problem of finding collision-free trajectories for a fleet of automated guided vehicles (AGVs) working in ship ports and freight terminals. Our solution computes collision-free trajectories for a fleet of AGVs to pick up one or more containers and transport it to a given goal without colliding with other AGVs and obstacles. We propose an integrated framework for solving the goal assignment and trajectory planning problem minimizing the maximum cost overall vehicle trajectories using the classical Hungarian algorithm.To deal with the dynamics in the environment, we refine our final trajectories with CHOMP (Covariant Hamiltonianoptimization for motion planning) in order to trade off between path smoothness and dynamic obstacle avoidance.

    Ladda ner fulltext (pdf)
    fulltext
  • 317.
    David, Jennifer
    et al.
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS), CAISR Centrum för tillämpade intelligenta system (IS-lab).
    Valencia, Rafael
    Carnegie Mellon University, Pittsburgh, USA.
    Philippsen, Roland
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS), CAISR Centrum för tillämpade intelligenta system (IS-lab).
    Iagnemma, Karl
    Massachusetts Institute of Technology, Cambridge, USA.
    Local Path Optimizer for an Autonomous Truck in a Harbour Scenario2017Konferensbidrag (Refereegranskat)
    Abstract [en]

    Recently, functional gradient algorithms like CHOMP have been very successful in producing locally optimal motion plans for articulated robots. In this paper, we have adapted CHOMP to work with a non-holonomic vehicle such as an autonomous truck with a single trailer and a differential drive robot. An extended CHOMP with rolling constraints have been implemented on both of these setup which yielded feasible curvatures. This paper details the experimental integration of the extended CHOMP motion planner with the sensor fusion and control system of an autonomous Volvo FH-16 truck. It also explains the experiments conducted on the differential-drive robot. Initial experimental investigations and results conducted in a real-world environment show that CHOMP can produce smooth and collision-free trajectories for mobile robots and vehicles as well. In conclusion, this paper discusses the feasibility of employing CHOMP to mobile robots.

  • 318.
    David, Jennifer
    et al.
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS), CAISR Centrum för tillämpade intelligenta system (IS-lab).
    Valencia, Rafael
    The Robotics Institute, Carnegie Mellon University, Pittsburgh, USA.
    Philippsen, Roland
    Iagnemma, Karl
    Massachusetts Institute of Technology, Cambridge, USA.
    Trajectory Optimizer for an Autonomous Truck in Container Terminal2017Ingår i: ICRA 2017 Workshop on Robotics and Vehicular Technologies for Self-driving cars, 2017Konferensbidrag (Refereegranskat)
  • 319.
    Davidsson, Adam
    et al.
    Högskolan i Halmstad, Akademin för informationsteknologi.
    Lindbom, Fredrik
    Högskolan i Halmstad, Akademin för informationsteknologi.
    Slow-response generator2015Självständigt arbete på grundnivå (högskoleexamen), 10 poäng / 15 hpStudentuppsats (Examensarbete)
    Abstract [en]

    Because of environmental pollution, forces the automotive industry constantly reduced emissions requirements legislated by the authorities. Improved techniques for engine control are a must for bringing down emissions. The use of an Exhaust Gas Recirculation (EGR) reduces NOx emissions significantly. Faulty EGR valves affect the emissions negative and therefore needs to be eliminated.

    It is possible to create malfunctions on the EGR valve by modifying the software of the control unit (ECU), but it does not create realistic malfunctions. The problem by modifying the software is that flags and various parameters are set to confirm the malfunction of the ECU. To create actual failure of the EGR valve an external tool to modify the control signal is needed.

    The project's main objective is on a flexible way creating malfunctions on the EGR valve in a truck engine. By investigating engine behavior in a realistic and credible way, one can eliminate malfunctions on the EGR valve. The aim was achieved by a model that has been developed that can, using electronics and a microprocessor read and create a control signal.

    The electronic circuit is controlled by the microprocessor, which can modify the signal and create malfunctions in the form of a slow valve "slow-response". A graphical user interface is used to change and influence the error signal. The circuit with the microprocessor is placed safely in a box to both protect and preserve the components.

    Simulation of Slow response has resulted in an incorrect operated valve being created. Using two different methods a Slow-response can be created. One method is a delay in time, which occurs when the new position is given, the second method is a ramp function when the control signal is gradually increasing. The software can also create an error that mimics a stuck valve of a fixed value. With the above listed methods it is possible in theory to find unknown malfunctions on the EGR valve that influence emissions negatively. 

    Ladda ner fulltext (pdf)
    fulltext
  • 320.
    Davidsson, Martin
    et al.
    Högskolan i Halmstad, Sektionen för Informationsvetenskap, Data– och Elektroteknik (IDE).
    Karlsson, Jonas
    Högskolan i Halmstad, Sektionen för Informationsvetenskap, Data– och Elektroteknik (IDE).
    Mätning och analys av elkvalité2012Självständigt arbete på grundnivå (kandidatexamen), 10 poäng / 15 hpStudentuppsats (Examensarbete)
    Ladda ner fulltext (pdf)
    Mätning och analys av elkvalité
  • 321.
    de Freitas, Edison Pignaton
    et al.
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS), Inbyggda system (CERES).
    Allgayer, Rodrigo S.
    Electrical Engineering Department – Federal University of Rio Grande do Sul Porto Alegre, Brazil.
    Heimfarth, Tales
    Computer Science Department – Federal University of Lavras Lavras, Brazil.
    Wagner, Fla ́vio R.
    Institute of Informatics – Federal University of Rio Grande do Sul Porto Alegre, Brazil.
    Larsson, Tony
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS).
    Pereira, Carlos E.
    Electrical Engineering Department – Federal University of Rio Grande do Sul Porto Alegre, Brazil.
    Ferreira, Armando M.
    Defense Engineering Graduate Program – Military Institute of Engineering Rio de Janeiro, Brazil.
    Coordination Mechanism and Customizable Hardware Platform to Provide Heterogeneous Wireless Sensor Networks Support2010Konferensbidrag (Refereegranskat)
    Abstract [en]

    This paper presents an effort to support emerging Wireless Sensor Networks applications composed by different types of sensor nodes. The work is composed by two parts, in which the first is dedicated to provide cooperation abilities to sensor nodes, while the second is a customizable hardware platform intended to provide different types of sensor nodes, from those more resource constrained up to the resource-rich ones. A description of a testbed demonstra- tor of the proposed system is provided and comparisons with previous published simulation results denote the feasibility of the proposal.

    Ladda ner fulltext (pdf)
    fulltext
  • 322.
    de Freitas, Edison Pignaton
    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).
    Allgayer, Rodrigo S.
    PPGEE, UFRGS, Brazil.
    Wehrmeister, Marco A.
    PPGC, UFRGS, Brazil.
    Pereira, Carlos E.
    PPGEE, UFRGS, Brazil.
    Larsson, Tony
    Högskolan i Halmstad, Sektionen för Informationsvetenskap, Data– och Elektroteknik (IDE), Halmstad Embedded and Intelligent Systems Research (EIS).
    Supporting platform for heterogeneous sensor network operation based on unmanned vehicles systems and wireless sensor nodes2009Ingår i: 2009 IEEE Intelligent Vehicles Symposium, Volumes 1 and 2 / [ed] Institute of Electrical and Electronics, New York: IEEE Press, 2009, s. 786-791Konferensbidrag (Refereegranskat)
    Abstract [en]

    Advances in vehicle intelligence technology is enabling the development of systems composed of unmanned vehicles, which are able to interact with devices spread on the environment in order to take decisions related to their movements. Sensor networks represent an area that can profit a lot of this new possibilities, as autonomous vehicles can be used to carry sensor devices, which interacting with static sensor nodes can enhance the results provided by the overall system. However, some problems arise in applications' development in such systems due to the network nodes heterogeneity, and also the dynamicity of the environment in which they are deployed, which changes constantly. Thus, new platform solutions are necessary to handle the heterogeneous nodes capabilities in order to facilitate coordination and integration among them. This paper proposes a supporting infrastructure to address these problems composed of an adaptive middleware and a customizable sensor node platform. The goal is to support cooperation in heterogeneous sensor networks, which are composed by static and mobile nodes with different capabilities. The middleware adapts itself in order to manage the very distinct computing resources of the nodes, and also changes in the environment and in the application demands. The customizable sensor node platform allows optimizations in hw/sw modules to meet specific application requirements, allowing the creation of low-end and resource rich nodes that work in an integrated network. In order to illustrate the proposed approach, a system for military surveillance applications is presented as case study.

  • 323.
    de Freitas, Edison Pignaton
    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).
    Binotto, Alécio Pedro Delazari
    Fraunhofer IGD / TU Darmstadt, Germany.
    Pereira, Carlos Eduardo
    PPGC UFRGS, Brazil.
    Stork, Andre
    Fraunhofer IGD / TU Darmstadt, Germany.
    Larsson, Tony
    Högskolan i Halmstad, Sektionen för Informationsvetenskap, Data– och Elektroteknik (IDE), Halmstad Embedded and Intelligent Systems Research (EIS), Centrum för forskning om inbyggda system (CERES).
    Dynamic activity and task allocation supporting uav teams in surveillance systems2009Ingår i: Proceedings of the International Multiconference on Computer Science and Information Technology, 2009. IMCSIT '09, Piscataway, N.J.: IEEE Press, 2009, s. 51-58Konferensbidrag (Refereegranskat)
    Abstract [en]

    The use of Unmanned Aerial Vehicles is increasing in the field of area patrolling and surveil- lance. A great issue that emerge in designing such systems is the target workload distribution over a fleet of UAVs, which generally have different capabilities of sensing and computing power. Targets should be assigned to the most suitable UAVs in order to efficiently perform the end-user initiated missions. To perform these missions, the UAVs require powerful high-performance platforms to deal with many dif- ferent algorithms that make use of massive calculations. The use of COTS hardware (e.g., GPU) presents an interesting low-cost alternative to compose the required platform. However, in order to efficiently use these heterogeneous platforms in a dynamic scenario, such as in surveillance systems, runtime reconfigu- ration strategies must be provided. This paper presents a dynamic approach to distribute the handling of targets among the UAVs and a heuristic method to address the efficient use of the heterogeneous hard- ware that equips these UAVs, with the goal to meet also mission timing requirements. Preliminary simu- lation results of the proposed heuristics are also provided.

  • 324.
    de Freitas, Edison Pignaton
    et al.
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS), Centrum för forskning om inbyggda system (CERES). Institute of Informatics, Federal University of Rio Grande do Sul, Brazil.
    Bösch, Bernhard
    Högskolan i Halmstad, Sektionen för Informationsvetenskap, Data– och Elektroteknik (IDE).
    Allgayer, Rodrigo
    Electrical Engineering Department, Universidade Federal do Rio Grande do Sul, Brazil.
    Steinfeld, Leonardo
    Electrical Engineering Institute, Universidad de la República, Uruguay.
    Wagner, Flávio
    Institute of Informatics, Federal University of Rio Grande do Sul, Brazil.
    Carro, Luigi
    Institute of Informatics, Federal University of Rio Grande do Sul, Brazil.
    Pereira, Carlos
    Institute of Informatics, Federal University of Rio Grande do Sul, Brazil; Electrical Engineering Department, Universidade Federal do Rio Grande do Sul, Brazil.
    Larsson, Tony
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS), Centrum för forskning om inbyggda system (CERES).
    Mobile Agents Model and Performance Analysis of a Wireless Sensor Network Target Tracking Application2011Ingår i: Smart spaces and next generation wired/wireless networking: 11th International Conference, NEW2AN 2011 and 4th Conference on Smart Spaces, RuSMART 2011, St. Petersburg, Russia, August 22 -25, 2011 ; proceedings / [ed] Sergey Balandin, Heidelberg: Springer Berlin/Heidelberg, 2011, Vol. 6869, s. 274-286Konferensbidrag (Refereegranskat)
    Abstract [en]

    Advances on wireless communication and sensor systems enabled the growing usage of Wireless Sensor Networks. This kind of network is being used to support a number of new emerging applications, thus the importance in studying the efficiency of new approaches to program them. This paper proposes a performance study of an application using high-level mobile agent model for Wireless Sensor Networks. The analysis is based on a mobile object tracking system, a classical WSN application. It is assumed that the sensor nodes are static, while the developed software is implemented as mobile agents by using the AFME framework. The presented project follows a Model-Driven Development (MDD) methodology using UML (Unified Modeling Language) models. Metrics related to dynamic features of the implemented solution are extracted from the deployed application, allowing a design space exploration in terms of metrics such as performance, memory and energy consumption. © Springer-Verlag Berlin Heidelberg 2011.

  • 325.
    de Freitas, Edison Pignaton
    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).
    Heimfarth, Tales
    Computer Science Department UFLA - Brazil.
    Costa, Luiz Augusto Guimarães
    Computer Science Department UFLA - Brazil.
    Ferreira, Armando M.
    Military Institute of Engineering - Brazil.
    Pereira, Carlos Eduardo
    PPGC UFRGS - Brazil.
    Wagner, Flávio Rech
    PPGC UFRGS - Brazil.
    Larsson, Tony
    Högskolan i Halmstad, Sektionen för Informationsvetenskap, Data– och Elektroteknik (IDE), Halmstad Embedded and Intelligent Systems Research (EIS), Centrum för forskning om inbyggda system (CERES).
    Analyzing different levels of geographic context awareness in agent ferrying over VANETs2011Ingår i: Proceedings of the 2011 ACM Symposium on Applied Computing, New York: ACM Press, 2011, s. 413-418Konferensbidrag (Refereegranskat)
    Abstract [en]

    The use of mobile software agents is a promising approach to implement services over ad hoc networks. This paper presents an analysis of mobile autonomous agents with different degrees of intelligence that allow them to make usage of the positioning information of vehicle carried sensor nodes with different depth of complexity, considering the nodes’ current and future locations. The agents’ intelligence is used to decide their movement during opportunistic connections among the nodes in order to accomplish missions. In this work, the analysis is done over an application of “virtual sensors”, implemented by services provided by the mobile agents. These agents run on top of an infrastructure-less Vehicular Ad hoc Network (VANET). Simulation results are presented and discussed to support the proposed ideas.

  • 326.
    de Freitas, Edison Pignaton
    et al.
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS), Inbyggda system (CERES).
    Heimfarth, Tales
    Computer Science Department, UFLA, Brazil.
    Ferreira, Armando Morado
    Military Institute of Engineering, Brazil.
    Pereira, Carlos Eduardo
    PPGC UFRGS, Brazil.
    Wagner, Flávio Rech
    PPGC UFRGS, Brazil.
    Larsson, Tony
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS), Inbyggda system (CERES).
    Decentralized task distribution among cooperative UAVs in surveillance systems applications2010Ingår i: 2010 Seventh International Conference on Wireless On-demand Network Systems and Services, New York: IEEE Press, 2010, s. 121-128Konferensbidrag (Refereegranskat)
    Abstract [en]

    Teams of small Unmanned Aerial Vehicles (UAVs) are being largely proposed to be used in different areas for both military and civilian applications. Their integration in wider sensor networks is also being considered in order to provide a better cost-benefit ration. However, coordination among UAV teams is not a trivial problem in an ad hoc network. This paper presents a decentralized coordination strategy to orient the actions of a team of UAVs, which take part in a wider sensor network, relying on ad hoc network communication. The proposed sensors network inclused static sensors that issue alarms indicating the presence of possible targets that must be handled by one of the UAVs and possibly relay messages among them. Preliminary results of the proposed approach are presented and are contrasted with results provided by a centralized solution for the problem.

  • 327.
    de Freitas, Edison Pignaton
    et al.
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS), Inbyggda system (CERES).
    Heimfarth, Tales
    Institute of Informatics, UFRGS, Porto Alegre, Brazil.
    Ferreira, Armando Morado
    Defense Engineering Graduate Program, Military Institute of Engineering, Rio de Janeiro, Brazil.
    Wagner, Flávio Rech
    Institute of Informatics, UFRGS, Porto Alegre, Brazil.
    Pereira, Carlos Eduardo
    Institute of Informatics, UFRGS, Porto Alegre, Brazil.
    Larsson, Tony
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS), Inbyggda system (CERES).
    An agent framework to support sensor networks’ setup and adaptation2009Ingår i: International Multiconference on Computer Science and Information Technology, 2009. IMCSIT ’09, Piscataway, N.J.: IEEE Press, 2009, s. 619-626Konferensbidrag (Refereegranskat)
    Abstract [en]

    Sensor networks are being used in several emerging applications not even imagined some years ago due to advances in sensing, computing, and communication techniques. However, these advances also pose various challenges that must be faced. One important challenge is related to the autonomous capability needed to setup and adapt the networks, which decentralizes the control of the network, saving communication and energy resources. Middleware technology helps in addressing this kind of problem, but there is still a need for additional solutions, particularly considering dynamic changes in users' requirements and operation conditions. This paper presents an agent-based framework acting as an integral part of a middleware to support autonomous setup and adaptation of sensor networks. It adds interoperability among heterogeneous nodes in the network, by means of autonomous behavior and reasoning. These features also address the needs for system setup and adaptations in the network, reducing the communication overhead and decentralizing the decision making mechanism. Additionally, preliminary results are also presented.

    Ladda ner fulltext (pdf)
    fulltext
  • 328.
    De Mol, Wouter
    Högskolan i Halmstad, Akademin för informationsteknologi.
    Comparison and evaluation of the accuracy of accelerometers and gyroscopes for detecting gait events in a real life setting2017Självständigt arbete på avancerad nivå (magisterexamen), 20 poäng / 30 hpStudentuppsats (Examensarbete)
    Ladda ner fulltext (pdf)
    fulltext
  • 329.
    Dimmler, Martin
    et al.
    Ecole Polytechnique Fédérale de Lausanne, Switzerland.
    Tisserand, Arnaud
    Ecole Polytechnique Fédérale de Lausanne, Switzerland.
    Holmberg, Ulf
    Högskolan i Halmstad, Sektionen för Informationsvetenskap, Data– och Elektroteknik (IDE).
    Longchamp, Roland
    Ecole Polytechnique Fédérale de Lausanne, Switzerland.
    On-line arithmetic for real-time control of microsystems1999Ingår i: IEEE/ASME transactions on mechatronics, ISSN 1083-4435, E-ISSN 1941-014X, Vol. 4, nr 2, s. 213-217Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The integration of microcontrollers within mechanical systems is a current trend. However, decreasing the size of the system and satisfying higher precision requirements make it necessary to reevaluate the common signal processing techniques for controller implementations, because limited controller size, computation speed, and power consumption become major topics. In this paper, we demonstrate that serial computations with the most significant digits first, that is, on-line arithmetic, offer an important potential for real-time control. They enable a combination of traditional functions, such as analog-to-digital converters and control data computations. This leads to very efficient controller implementations with small size, high speed, and low power consumption. After a brief description of the requirements and challenges of microsystem controller design, the use of on-line arithmetic for real-time control is proposed. A short introduction to on-line arithmetic is given and control-specific implementation guidelines are presented and finally applied to a simple test system.

    Ladda ner fulltext (pdf)
    FULLTEXT01
  • 330.
    Dimopoulos, A.
    et al.
    Natl Tech Univ Athens, Dept Mech Engn, Athens 15780, Greece.
    Papadopoulos, E.
    Natl Tech Univ Athens, Dept Mech Engn, Athens 15780, Greece.
    Iagnemma, Karl
    MIT, USA.
    Experimental tissue parameter identification for use in endoscopic urological haptic simulators2009Ingår i: Control and Automation, 2009. MED ’09. 17th Mediterranean Conference on, Piscataway, N.J.: IEEE Press, 2009, s. 1131-1136Konferensbidrag (Refereegranskat)
    Abstract [en]

    A method is developed for obtaining parameters for tube-like soft-tissues, to be used in urological haptic simulators. A device was designed and built that allows the acquisition of forces and displacements during endoscope insertion in a tubelike soft tissue. The device consists of a mechatronic ball screw mechanism, with a 6 DOF force/ torque sensor attached to it. The steel shaft representing the endoscope, is commanded to follow desired trajectories with micrometric accuracy under the application of an IPD controller, implemented on a dSpace 1103 system. The experimental data acquired is fitted to polynomials to yield a tissue model that can be used to predict insertion forces required for haptic simulator feedback.

  • 331.
    Dincay, Berkan
    Högskolan i Halmstad, Sektionen för Informationsvetenskap, Data– och Elektroteknik (IDE), Halmstad Embedded and Intelligent Systems Research (EIS).
    GPS/Optical Encoder Based Navigation Methods for dsPIC Microcontroled Mobile Vehicle2010Självständigt arbete på avancerad nivå (masterexamen), 30 poäng / 45 hpStudentuppsats (Examensarbete)
    Abstract [en]

    Optical encoders are being widely suggested for precise mobile navigation. Combining such sensor information with Global Positioning System (GPS) is a practical solution for reducing the accumulated errors from encoders and moving the navigational base into global coordinates with high accuracy.

    This thesis presents integration methods of GPS and optical encoders for a mobile vehicle that is controlled by microcontroller. The system analyzed includes a commercial GPS receiver, dsPIC microcontroller and mobile vehicle with optical encoders. Extended kalman filtering (EKF), real time curve matching, GPS filtering methods are compared and contrasted which are used for integrating sensors data. Moreover, computer interface, encoder interface and motor control module of dsPIC microprocessor have been used and explained.

    Navigation quality on low speeds highly depends greatly upon the processing of GPS data. Integration of sensor data is simulated for both EKF and real time curve matching technique and different behaviors are observed. Both methods have significantly improved the accuracy of the navigation. However, EKF has more advantages on solving the localization problem where it is also dealing with the uncertainties of the systems.

    Ladda ner fulltext (pdf)
    FULLTEXT01
  • 332.
    Dorrell, David G.
    et al.
    University of Technology Sydney, Sydney, New South Wales, Australia.
    Vinel, Alexey
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS), Centrum för forskning om inbyggda system (CERES).
    Cao, Dongpu
    Cranfield University, Bedford, United Kingdom.
    Connected Vehicles – Advancements in Vehicular Technologies and Informatics2015Ingår i: IEEE transactions on industrial electronics (1982. Print), ISSN 0278-0046, E-ISSN 1557-9948, Vol. 62, nr 12, s. 7824-7826, artikel-id 7322333Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Vehicles are becoming increasingly more sophisticated and the technology being developed in them covers a number of areas. At the heart of these developments are often the communication, information and control systems. This is very much illustrated in this "Special Section on Connected Vehicles - Advancements in Vehicular Technologies and Informatics" of the IEEE Transactions on Industrial Electronics that we are pleased to present. The Special Section contains twelve papers related to automotive technology. Obviously there a range of areas covered from very high speed machines, that could be used for cooling fans in automotive fuel cells or scaled up for drive motors, to energy management and into various communications aspects of vehicular technology. © 1982-2012 IEEE.

  • 333.
    Druyts, Jan
    Högskolan i Halmstad, Sektionen för ekonomi och teknik (SET), Bio- och miljösystemforskning (BLESS), Energiteknik.
    Control induction motor by frequency converter: Simulation electric vehicle2010Självständigt arbete på avancerad nivå (magisterexamen), 15 poäng / 22,5 hpStudentuppsats (Examensarbete)
    Abstract [en]

    Summary

     Today we are probably on a point of change for the car industry. The last century was the century of vehicles with internal combustion engines. Fossil fuels were relative cheap, easy accessible and they have a high specific energy. The pollution and dependency on oil caused the last decade an increasing demand for alternatives. Alternatives for electric power plants and for car drives. Yet the turnover to hybrids is a fact and much research is done for pure electric vehicles. Research about the control of electric motors is by that become a hot topic.

    To simulate an electric vehicle drive with an induction motor, a frequency converter is needed. This combination of motor and converter led to many possible experiments. With a few experiments already done and a broad theoretical background report this thesis provides a good bundle of information to start with further experiments. The experiments can become even broader when a flywheel is added as mass inertia momentum and a DC source on the DC-link. Both elements contribute for a better simulation of an electric motor in an electric vehicle.

    What is described in this theoretical report about the combination of an induction motor and converter is only the tip of the iceberg. I had too less time to begin experimenting with the flying wheel. The DC-link voltage becomes ca. 540V. From the perspective of safety I could never work alone with the DC-link. Even with a companion it was too dangerous because the equipment of the Halmstad University is not made for such dangerous voltages. That’s why this thesis contains more theoretical background and less actual practical data.

    Ladda ner fulltext (pdf)
    FULLTEXT01
  • 334.
    Du, Tianlong
    et al.
    Högskolan i Halmstad, Sektionen för Informationsvetenskap, Data– och Elektroteknik (IDE).
    Ye, Jie
    Högskolan i Halmstad, Sektionen för Informationsvetenskap, Data– och Elektroteknik (IDE).
    CHAT: City Error Handling through Instagram and FixaMinGata2013Självständigt arbete på grundnivå (kandidatexamen), 10 poäng / 15 hpStudentuppsats (Examensarbete)
    Abstract [en]

    Deficient public infrastructure always causes significant complications to citizens’ daily travelling. However, it is hard for authorities to discover all the problems that suddenly occur on the road. To address these issues, one direction is to develop a system that allows citizens to report a problem quickly, so that the authorities could receive the information timely and solve it as soon as possible.

    In our project, instead of developing everything from scratch, we have decided to use Instagram and FixaMinGata as components. Instagram is a smart phone application that is used to share a photo with public. We use it to make a report which related to potholes, broke street lights and other similar problems.  FixaMinGata is a Swedish website that allows people to publish infrastructure problem reports online and forwards them to the authorities.

    Thus, the main purpose of our project is to make an interface between Instagram and FixaMinGata. It involves using the information that extracted from Instagram to create and post a report on FixaMinGata and to forward the feedback from authorities to Instagram users as well.

    This project runs under Ubuntu 12.04, and we have selected Python as the programming language. Besides these development environments, some additional modules are imported as well, such as Bottle, Selenium, Poster and Mechanize.

    Ladda ner fulltext (pdf)
    CHAT - City Error Handling through Instagram and FixaMinGata
  • 335.
    Dubowsky, S.
    et al.
    MIT, USA.
    Iagnemma, Karl
    MIT, USA.
    Liberatore, S.
    MIT, USA.
    Lambeth, D. M.
    MIT, USA.
    Plante, J. S.
    MIT, USA.
    Boston, P. J.
    New Mexico Tech. NM Institute of Mining and Technology, Socorro, NM 87801, United States.
    A concept mission: Microbots for large-scale planetary surface and subsurface exploration2005Ingår i: Space technology and applications international forum: STAIF 2005 / [ed] Mohamed S El-Genk, College Park, MD: American Institute of Physics (AIP), 2005, s. 1449-1458Konferensbidrag (Refereegranskat)
    Abstract [en]

    This paper presents a new mission concept for planetary exploration, based on the deployment of a large number of small spherical mobile robots ("microbots") over vast areas of a planet's surface and subsurface, including structures such as caves and near-surface crevasses (see Figure 1). This would allow extremely large-scale in situ analysis of terrain composition and history. This approach represents an alternative to rover and lander-based planetary exploration, which is limited to studying small areas of a planet's surface at a small number of sites. The proposed approach is also distinct from balloon or aerial vehicle-based missions, in that it would allow direct in situ measurement. In the proposed mission, a large number (i.e. hundreds or thousands) of cm-scale, sub-kilogram microbots would be distributed over a planet's surface by an orbital craft and would employ hopping, bouncing and rolling as a locomotion mode to reach scientifically interesting artifacts in very rugged terrain. They would be powered by high energy-density polymer "muscle" actuators, and equipped with a suite of miniaturized imagers, spectrometers, sampling devices, and chemical detection sensors to conduct in situ measurements of terrain and rock composition, structure, etc. Multiple microbots would coordinate to share information, cooperatively analyze large portions of a planet's surface or subsurface, and provide context for scientific measurements. © 2005 American Institute of Physics.

  • 336.
    Duracz, Adam
    et al.
    Rice University, Houston, TX, United States.
    Moggi, Eugenio
    DIBRIS, Genova University, Genova, Italy.
    Taha, Walid
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS), Centrum för forskning om inbyggda system (CERES).
    Lin, Zhenchao
    Zhejiang University, Hangzhou, China.
    A Semantic Account of Rigorous Simulation2018Ingår i: Principles of Modeling: Essays Dedicated to Edward A. Lee on the Occasion of His 60th Birthday / [ed] Marten LohstrohPatricia DerlerMarjan Sirjani, Amsterdam: Springer Berlin/Heidelberg, 2018, Vol. 10760, s. 223-239Kapitel i bok, del av antologi (Refereegranskat)
    Abstract [en]

    Hybrid systems are a powerful formalism for modeling cyber-physical systems. Reachability analysis is a general method for checking safety properties, especially in the presence of uncertainty and non-determinism. Rigorous simulation is a convenient tool for reachability analysis of hybrid systems. However, to serve as proof tool, a rigorous simulator must be correct w.r.t. a clearly defined notion of reachability, which captures what is intuitively reachable in finite time. As a step towards addressing this challenge, this paper presents a rigorous simulator in the form of an operational semantics and a specification in the form of a denotational semantics. We show that, under certain conditions about the representation of enclosures, the rigorous simulator is correct. We also show that finding a representation satisfying these assumptions is non-trivial. © 2018, Springer International Publishing AG, part of Springer Nature.

  • 337.
    Duracz, Jan
    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).
    Konečný, Michal
    School of Engineering and Applied Science, Aston University, Birmingham, United Kingdom.
    Polynomial Function Intervals for Floating-Point Software Verification2014Ingår i: Annals of Mathematics and Artificial Intelligence, ISSN 1012-2443, E-ISSN 1573-7470, Vol. 70, nr 4, s. 351-398Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The focus of our work is the verification of tight functional properties of numerical programs, such as showing that a floating-point implementation of Riemann integration computes a close approximation of the exact integral. Programmers and engineers writing such programs will benefit from verification tools that support an expressive specification language and that are highly automated. Our work provides a new method for verification of numerical software, supporting a substantially more expressive language for specifications than other publicly available automated tools. The additional expressivity in the specification language is provided by two constructs. First, the specification can feature inclusions between interval arithmetic expressions. Second, the integral operator from classical analysis can be used in the specifications, where the integration bounds can be arbitrary expressions over real variables. To support our claim of expressivity, we outline the verification of four example programs, including the integration example mentioned earlier. A key component of our method is an algorithm for proving numerical theorems. This algorithm is based on automatic polynomial approximation of non-linear real and real-interval functions defined by expressions. The PolyPaver tool is our implementation of the algorithm and its source code is publicly available. In this paper we report on experiments using PolyPaver that indicate that the additional expressivity does not come at a performance cost when comparing with other publicly available state-of-the-art provers. We also include a scalability study that explores the limits of PolyPaver in proving tight functional specifications of progressively larger randomly generated programs.

  • 338.
    Durán, Boris
    et al.
    RISE Viktoria, Gothenburg, Sweden.
    Englund, Cristofer
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS), CAISR Centrum för tillämpade intelligenta system (IS-lab). RISE Viktoria, Gothenburg, Sweden.
    Habobovic, Azra
    RISE Viktoria, Gothenburg, Sweden.
    Andersson, Jonas
    RISE Viktoria, Gothenburg, Sweden.
    Modeling vehicle behavior with neural dynamics2017Ingår i: Future Active Safety Technology - Towards zero traffic accidents, Nara, Japan, 2017Konferensbidrag (Refereegranskat)
    Abstract [en]

    Modeling the interaction of vehicles during certain traffic situations is the starting point for creating autonomous driving. Data collected from field trials where test subjects drive through a single-vehicle intersection was used to create behavioral models. The present work describes two implementations of models based on the dynamical systems approach and compares similarities and differences between them. The proposed models are designed to closely replicate the behavior selection in the intersection crossing experiment.

    Ladda ner fulltext (pdf)
    fulltext
  • 339.
    Díez Rodríguez, Victor
    et al.
    Högskolan i Halmstad, Akademin för informationsteknologi.
    Detournay, Jérôme
    Högskolan i Halmstad, Akademin för informationsteknologi.
    Vinel, Alexey
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS), Centrum för forskning om inbyggda system (CERES).
    Lyamin, Nikita
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS), Centrum för forskning om inbyggda system (CERES).
    An Approach for Receiver-Side Awareness Control in Vehicular Ad Hoc Networks2018Ingår i: IEEE transactions on intelligent transportation systems (Print), ISSN 1524-9050, E-ISSN 1558-0016, Vol. 19, nr 4, s. 1227-1236Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Vehicular Ad hoc networks (VANET) are a key element of cooperative intelligent transport systems. One of the challenges in VANETs is dealing with awareness and congestion due to the high amount of messages received from the vehicles in communication range. As VANETs are used in critical applications, congestion on the receiver side caused by the buffering of the packets is a safety hazard. In this paper, we propose a streamwise queuing system on the receiver side and show how it improves the timeliness of the messages received and maintains the awareness of the system in a congestion situation. © Copyright 2017 IEEE

  • 340.
    Díez Rodríguez, Víctor
    et al.
    Högskolan i Halmstad, Akademin för informationsteknologi.
    Detournay, Jérôme
    Högskolan i Halmstad, Akademin för informationsteknologi.
    An Approach for Receiver-Side Awareness Control in Vehicular Ad-Hoc Networks2016Självständigt arbete på avancerad nivå (masterexamen), 20 poäng / 30 hpStudentuppsats (Examensarbete)
    Abstract [en]

    Vehicular Ad-Hoc Network (VANET)s are a key element of Intelligent Transport System (ITS)s. One of the challenges in VANETs is dealing with awareness and congestion due to the high amount of messages received from the vehicles in communication range. As VANETs are used in critical applications, congestion on the receiver side caused by the buffering of the packets is a safety hazard. In this thesis, we propose a stream-wise queuing system on the receiver side and show how it improves the timeliness of the messages received and main- tains the awareness of the system in a congestion situation.

    Ladda ner fulltext (pdf)
    fulltext
  • 341.
    Ebers, Lucas
    et al.
    Högskolan i Halmstad, Akademin för informationsteknologi.
    Eriksson, Niklas
    Högskolan i Halmstad, Akademin för informationsteknologi.
    Projektering av lokalnät med fördjupning i selektivitet2019Självständigt arbete på grundnivå (högskoleexamen), 180 hpStudentuppsats (Examensarbete)
    Abstract [sv]

    Inom elkraftsystem, när ett luftburet lokalnät ersätts med ett markförlagt förändras förutsättningarna i formav materialets egenskaper och det ger möjlighet för uppdaterad dimensionering. Målet var att presentera ettförslag på ombyggnation av ett äldre luftburet till ett modernare markförlagt lokalnät och presenteraselektivplaner för samtliga grenar av det nya nätet. Metoder som använts är Velanders metod försammanlagring av maxeffekter, dimensionering enligt Svensk Standard och kurvanpassning avutlösningskurvor för att presentera digitalt framställda selektivplaner. Det markförlagda lokalnätet levereraren bättre elkvalitet, uppfyller utlösningsvillkoret och erhåller god selektivitet.

    Ladda ner fulltext (pdf)
    fulltext
  • 342.
    Eckhardt, Jason
    et al.
    Rice University, Houston, TX 77005, USA.
    Kaiabachev, Roumen
    Rice University, Houston, TX 77005, USA.
    Pasalic, Emir
    Rice University, Houston, TX 77005, USA.
    Swadi, Kedar
    Rice University, Houston, TX 77005, USA.
    Taha, Walid
    Rice University, Houston, TX 77005, USA.
    Implicitly Heterogeneous Multi-Stage Programming2005Ingår i: Generative Programming and Component Engineering: 4th International Conference, GPCE 2005, Tallinn, Estonia, September 29 - October 1, 2005. Proceedings / [ed] Robert Glück, Michael Lowry, Heidelberg: Springer, 2005, s. 275-292Konferensbidrag (Refereegranskat)
    Abstract [en]

    Previous work on semantics-based multi-stage programming(MSP) language design focused on homogeneous designs, where the generating and the generated languages are the same. Homogeneous designssimply add a hygienic quasi-quotation and evaluation mechanism to abase language. An apparent disadvantage of this approach is that theprogrammer is bound to both the expressivity and performance characteristics of the base language. This paper proposes a practical means toavoid this by providing specialized translations from subsets of the baselanguage to different target languages. This approach preserves the homogeneous “look” of multi-stage programs, and, more importantly, thestatic guarantees about the generated code. In addition, compared to anexplicitly heterogeneous approach, it promotes reuse of generator sourcecode and systematic exploration of the performance characteristics of thetarget languages.To illustrate the proposed approach, we design and implement a translation to a subset of C suitable for numerical computation, and show thatit preserves static typing. The translation is implemented, and evaluatedwith several benchmarks. The implementation is available in the onlinedistribution of MetaOCaml.

  • 343.
    Eckhoff, David
    et al.
    University of Erlangen.
    Festag, Andreas
    University of Dresden.
    Gruteser, Marco
    Rutgers University.
    Schimandl, Florian
    Technische Universität München.
    Segata, Michele
    University of Innsbruck.
    Uhlemann, Elisabeth
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS), Centrum för forskning om inbyggda system (CERES).
    Best practices for field operational testing2014Ingår i: Inter-Vehicular Communications – Quo Vadis: Report from Dagstuhl Seminar 13392 / [ed] Onur Altintas, Falko Dressler, Hannes Hartenstein and Ozan K. Tonguz, Dagstuhl, Germany: Schloss Dagstuhl, Leibniz-Zentrum fuer Informatik , 2014, s. 206-209Kapitel i bok, del av antologi (Övrigt vetenskapligt)
    Ladda ner fulltext (pdf)
    fulltext
  • 344.
    Eile, Victor
    Högskolan i Halmstad, Sektionen för Informationsvetenskap, Data– och Elektroteknik (IDE).
    Elnätskommunikation och högfrekventa störningar2014Självständigt arbete på grundnivå (högskoleexamen), 10 poäng / 15 hpStudentuppsats (Examensarbete)
    Abstract [sv]

    Sedan 2009 fjärravläses och faktureras alla Sveriges elnätskunder varje månad. Fakturan bygger på senaste månadens förbrukning, tidigare fakturerades man efter uppskattad förbrukning med avseende på tidigare historik. Det nya systemet infördes i syfte att skapa mer medvetenhet hos kunden om dess elförbrukning och därmed en bättre förutsättning att ändra beteendemönster. Majoriteten av elnätsbolagen använder sig av elnätskommunikation för att skicka information till och från elmätarna. Det är ett smidigt sätt att upprätta ett större kommunikationsnät eftersom infrastrukturen redan finns där, elnätet. Examensarbetet utfördes i samarbete med Värnamo Energi. Syftet med examensarbetet är att utreda vad som påverkar kommunikationen och hur deras elnätskommunicerande system Addax fungerar mer i detalj. En djupare analys utfördes kring AIU–enheten, som är ett kommunikationsgränssnitt mellan fjärrvärmemätaren och Addax–systemet. Analysen utfördes på grund av att cirka 10 procent av mätdatan saknas varje månad. För att lösa uppdraget på bästa vis inleddes arbetet med en grundlig förstudie inom ämnet genom läsning av rapporter och tekniska manualer. Under examensarbetets gång deltog jag i felsökningsarbete ute på nätet för att kunna koppla teorin bättre till verkligheten. I rapporten redovisas några typiska exempel ifrån felsökningsarbetet av vanligt förekommande fel. För att kunna utvärdera AIU–enheten byggdes en mindre laborationsmiljö för att effektivt isolera påverkan av de störningar som förekommer på nätet. Resultaten visar att fjärrvärmeanläggningens cirkulationspump som förespåddes vara störkällan inte var problemet. Det visade sig att AIU–enheten var begränsad till att etablera kontakt vid en frekvens. Elnätet tidsvarierande karaktäristisk och de störningar som vissa anslutna apparater genererar ställer krav på att kommunikationssystem har viss kommunikationsflexibilitet

    Ladda ner fulltext (pdf)
    fulltext
  • 345.
    Ejdeholm, Dawid
    et al.
    Högskolan i Halmstad, Akademin för informationsteknologi.
    Harsten, Jacob
    Högskolan i Halmstad, Akademin för informationsteknologi.
    Detection of common envoirmental interferences in front of a camera lens2018Självständigt arbete på grundnivå (kandidatexamen), 10 poäng / 15 hpStudentuppsats (Examensarbete)
    Abstract [en]

    Modern vehicles are very dependent on sensors and especially cameras to analyze different objects and conditions. Single camera systems are frequently used for lane detection and identifying objects in the distance. These systems depend on good conditions to work properly and are easily disrupted by environmental interferences. This project is targeted in developing an image processing algorithm that can detect disturbances applied upon the camera lens. Several focus measure operators are evaluated and compared by expected outcome while still maintaining a satisfying computational time, low resource usage and accuracy with an ERR between 0% - 1%.

    Ladda ner fulltext (pdf)
    fulltext
  • 346.
    Ejnarsson, Marcus
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS).
    Data Mining and Analysis for Characterizing Paper from On-line Multisensor Measurements2008Licentiatavhandling, monografi (Övrigt vetenskapligt)
    Abstract [en]

    The objective of this thesis is to develop a multi-resolution tool for screening paper formation variations, aiming to detect abnormalities in various frequency regions ranging from millimeters to several meters. The abnormalities detected in different frequency regions give an indication for the paper maker about specific disturbances in the paper production process. A paper web, running at a speed of 30 m/s, is illuminated by two red diode lasers and the reflected light are recorded as two time series of high resolution measurements constitutes the input signal to the papermaking process monitoring system. The time series are divided into blocks and each block is analyzed separately. The task is treated as a kernel based novelty detection applied to a multi-resolution time series representation obtained from the frequency bands of the Fourier power spectra of the blocks. The frequency content of each frequency region is characterized by a feature vector, which is transformed using the canonical correlation analysis and then categorized into the inlier or outlier class by the novelty detector. The ratio of outlying data points, significantly exceeding the predetermined value, indicates abnormalities in the paper formation. The experimental investigations performed have shown that the presented paper formation deficiencies monitoring technique and the system can be used for on-line monitoring of paper deficiencies manifesting themselves in a broad frequency range. A software, implementing the technique, was developed and used for online paper formation monitoring at a Swedish paper mill.

  • 347.
    Ek, Ida
    et al.
    Högskolan i Halmstad, Sektionen för Informationsvetenskap, Data– och Elektroteknik (IDE).
    Hornebrant, Erik
    Högskolan i Halmstad, Sektionen för Informationsvetenskap, Data– och Elektroteknik (IDE).
    Kartläggning av internetbaserad tunn klient2014Självständigt arbete på grundnivå (kandidatexamen), 10 poäng / 15 hpStudentuppsats (Examensarbete)
    Abstract [sv]

    Då datorer i alla dess former har kommit att bära betydande mängder relevant information för diverse forensiska utredningar så krävs en ingående kunskap gällande hur denna data lämpligast infångas. En typ av klient som nyligen har gjort sitt kommersiella intåg på marknaden är den internetbaserade tunna klienten. Det existerar i dagsläget begränsat med underlag gällande huruvida en sådan klient bär information som är relevant för en IT-forensisk utredning.

    Inom denna uppsats har därför en internetbaserad tunn klient av typen Chromebook varit mål för undersökning. Syftet har varit att kartlägga vilka sårbarheter som existerar, samt om möjligt huruvida dessa kan brukas som underlag vid en forensisk utredning. För detta ändamål har klientens lagrings- samt kommunikationsmönster analyserats. För genomförandet av detta brukades experimentella metodiker i form av penetrationstest samt IT-forensisk undersökning. Det har även kartlagts huruvida programvaror avsedda för operativsystemet Linux kan exekveras på klienten. Ändamålet med detta var att fastställa om klientens volatila minne kan utvinnas med hjälp av verktyg för just Linux.

    Rapportens resultat påvisar att det inom en klient av denna typ finns forensiskt värdefull information att inhämta. Det påvisas även att Chrome OS från en användares perspektiv kan anses som säkert.

    Ladda ner fulltext (pdf)
    fulltext
  • 348.
    Eldefrawy, Mohamed Hamdy
    et al.
    Department of Information Systems and Technology, Mid Sweden University, Sundsvall, Sweden.
    Ferrari, Nico
    Department of Information Systems and Technology, Mid Sweden University, Sundsvall, Sweden.
    Gidlund, Mikael
    Department of Information Systems and Technology, Mid Sweden University, Sundsvall, Sweden.
    Dynamic User Authentication Protocol for Industrial IoT without Timestamping2019Ingår i: 2019 15TH IEEE INTERNATIONAL WORKSHOP ON FACTORY COMMUNICATION SYSTEMS (WFCS), Institute of Electrical and Electronics Engineers (IEEE), 2019Konferensbidrag (Refereegranskat)
    Abstract [en]

    Internet of Things (IoT) technology has drawn the attention of the industry, where it has been able to, and still can, solve many industrial intractable issues. However, the emerging technology suffers from severe security shortcomings. Authentication is a cornerstone of IoT security, as it presents the measures of checking the legitimacy of communication entities. The Industrial IoT (IIoT) technology has special conditions, resulting from a lack of resources and a shortage of security skills. As far as we can tell, from the literature, IIoT user authentication has not been studied extensively. In 2017 Tai et al. presented an authenticated key agreement for IoT networks. Here we prove that Tai et al. scheme is susceptible to sever security weaknesses, such as; i. unknown key share attacks, ii. node capturing attacks, iii node information secrecy. In this research article, we offer an innovative IIoT user authentication protocol that can achieve secure remote user authentication without timestamping requiring precise synchronization, our protocol only needs Hashing and Xor-ing. We examine the efficiency of the presented protocol using Tmote Sky node over an MSP430 microcontroller using a COOJA simulator. we also show its correctness using the Scyther verification tool.

  • 349.
    Ellner, Stephan
    et al.
    Google Inc, Mountain View, USA.
    Taha, Walid
    Rice University Houston, Houston, USA.
    The Semantics of Graphical Languages2007Ingår i: PEPM 2007: proceedings of the Workshop on Partial Evaluation and Program Manipulation : Nice, France, January 15-16, 2007, New York, NY: ACM Press, 2007, s. 122-133Konferensbidrag (Refereegranskat)
    Abstract [en]

    Visual notations are pervasive in circuit design, control systems, and increasingly in mainstream programming environments. Yet many of the foundational advances in programming language theory are taking place in the context of textual notations. In order to map such advances to the graphical world, and to take the concerns of the graphical world into account when working with textual formalisms, there is a need for rigorous connections between textual and graphical expressions of computation. To this end, this paper presents a graphical calculus called Uccello. Our key insight is that Ariola and Blom's work on sharing in the cyclic lambda calculus provides an excellent foundation for formalizing the semantics of graphical languages. As an example of what can be done with this foundation, we use it to extend a graphical language with staging constructs. In doing so, we provide the first formal account of sharing in a multi-stage calculus. Copyright © 2007 ACM.

  • 350.
    Emanuelsson, Herman
    et al.
    Högskolan i Halmstad, Sektionen för Informationsvetenskap, Data– och Elektroteknik (IDE).
    Sjunnesson, Emil
    Högskolan i Halmstad, Sektionen för Informationsvetenskap, Data– och Elektroteknik (IDE).
    Fjärrstyrt kamerafäste: HE Remote2013Självständigt arbete på grundnivå (högskoleexamen), 10 poäng / 15 hpStudentuppsats (Examensarbete)
    Abstract [sv]

    Vid tillfällen då det inte lämpar sig att stå vid en videokamera kan det lösas med ett fjärrstyrt kamerafäste. Exempel på tillfällen är på grund av platsbrist på en konsert, en högtidsceremoni där någon måste stå konstigt till för att få bra bild, ute i naturen där djur ska filmas utan att bli ivägskrämda eller vid personalbrist, en tight budget och måste styra flera kameror samtidigt. De system som finns tillgängliga på amatörmarknaden idag har antingen annan funktionalitet och passar sig inte för ovanstående problem eller har väldigt begränsad räckvidd och går inte att sammankoppla med en mobilapplikation.

    Detta projekt går ut på att ta fram en kostnadseffektiv och skräddarsydd lösning för ovanstående problem genom att utveckla ett fjärrstyrt kamerafäste i semiproffssegmentet där det via en handkontroll och vid senare skede med en mobilapplikation styr kamerans lutning och rotation även kallad tiltning och panorering.

    Skillnaderna mellan denna och befintliga lösningar är att med hjälp av Bluetooth-tekniken kan styra både med handkontroll och senare även med en mobilapplikation, anledningen till att det skall kunna styra med båda är att det inte alltid är tillåtet att använda sig av mobiltelefoner i alla miljöer där man vill filma och därför får ett bredare användningsområde för kamerafästet.

    Ladda ner fulltext (pdf)
    Examensrapport_HE_Remote_Emil_Sjunnesson_Herman_Emanuelsson
45678910 301 - 350 av 1325
RefereraExporteraLänk till träfflistan
Permanent länk
Referera
Referensformat
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Annat format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annat språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf