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  • 1.
    Abbasi, Jasim Aftab
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
    Test of Rapid Control System Development using TargetLink2012Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    The aim of this thesis is to employ and evaluate an evaluation board with the standard microprocessor freescale MPC5554EVB board for implementation of control algorithms which are created in Matlab/Simulink instead of using dSPACE prototyping hardware. The Simulink real-time model shall be compiled to the MPC5554EVB board. TargetLink is a powerful software tool which allows an automatic generation of efficient C code from Simulink and facilitates model-based control design. The goal of this thesis is to learn how to use TargetLink in a control design workflow from model to real code and what are the limitations of a microprocessor platform and to evaluate the capabilities of TargetLink to generate a working code for a generic microprocessor.

  • 2.
    Coenen, Bram
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
    MEASURING THE REAL-TIME LATENCY OF AN I.MX7D USING XENOMAI AND THE YOCTO PROJECT2019Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    In this thesis the real-time latency of an i.MX7D processor on a CL-SOM-IMX7 boardis evaluated. The real-time Linux for the system is created using Xenomai with both theI-Pipe patch and thePREEMPT_RTpatch. The embedded distribution is built using theYocto Project and uses a vendor i.MX kernel maintained by NXP.

    The maximum latency for thecobaltcore is268μsfor user-space tasks with a loadedCPU. These types of tasks have the highest latency of Xenomai's three task categories.A latency measurement of thePREEMPT_RTpatch showed a maximum latency ofwith an idle CPU. Therefore it is concluded that thecobalt412μscore has a lower latencyand is therefore better suited for real-time applications.

    A comparison is made with other modules and it is found that the latency measured inthis thesis is high compared to for example a Raspberry Pi 3B.

    The source code and congurations for the project can be found at https://github.com/bracoe/meta-xenomai-imx7d

  • 3.
    Edström, Urban
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics. Centrum för medicinsk teknik och strålningsfysik.
    Nackvinkelmätningar vid thoraxoperation: Kan prismaglasögon underlätta arbetet för operationssjuksköterskor?2017Independent thesis Advanced level (degree of Master (One Year)), 40 credits / 60 HE creditsStudent thesis
  • 4.
    Edström, Urban
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
    Nackvinkelmätningar vid thoraxoperation: Kan prismaglasögon underlätta arbetet för operationssjuksköterskor?2017Independent thesis Advanced level (degree of Master (One Year)), 20 credits / 30 HE creditsStudent thesis
  • 5.
    Eilertsen, Svein Morten
    et al.
    Bioforsk Nord Tjøtta.
    Karlsson, Johannes
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
    Electronically sensors system to warn drivers if a reindeer is close to the road or the railway2014In: Nordic Association of Agricultural Scientists: NJF Report, 2014, Vol. 10, p. 30-30Conference paper (Refereed)
    Abstract [en]

    In Norway, Sweden and Finland approximately 9.000 reindeer are killed every year in traffic accidents (road and railway). In field experiments two different electronically sensor system were used. The purpose is to warn car drivers and railway engineers that reindeer are close to, or on the traffic system, and reduce the numbers of accident. The information system developed by Telespor is based on GPS/GSM radio collars. These collars use SMS to inform that the reindeer are close to the traffic system. In addition to the warning, the reindeer owners get information about the reindeer land use throughout the whole year. The collars are expensive (approx. 250 euros/unit) and need battery change every year. At Umeå University a system based on wireless sensor nodes attached to the reindeer collars is developed. This node will send out a periodic warning radio beacon. On road sticks a warning device will be attached containing a radio receiver and LED flashlights that will warn if a radio beacon is received. To further increase the warning distance it is possible to use communication between the roadside warning devices and let several devices flash their LED lights when a reindeer is detected. The radio collar (approx. 15 euros/unit) will have a theoretical battery life of more than 10 years. The radio range is around 500 meters between the radio collar and the roadside warning device, which is more than sufficient.

  • 6.
    Forsgren, Fredrik
    Umeå University, Faculty of Science and Technology, Department of Physics.
    Active Noise Control in Forest Machines2011Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Achieving a low noise level is of great interest to the forest machine industry. Traditionally this is obtained by using passive noise reduction, i.e. by using materials for sound isolation and sound absorption. Especially designs to attenuate low frequency noise tend to be bulky and impractical from an installation point of view. An alternative solution to the problem is to use active noise control (ANC). The basic principle of ANC is to generate an anti-noise signal designed to destructively interfere with the unwanted noise.

    In this thesis two algorithms (Feedback FxLMS and Feedforward FxLMS) are implemented and evaluated for use in the ANC-system. The ANC-system is tuned to the specific environment in the driver’s cabin of a Komatsu forest machine. The algorithms are first tested in a simulated environment and then in real-time inside a forest machine.

    Simulations are made both in Matlab and in C using both generated signals and recorded signals. The C code is implemented on the Analog Devices Blackfin DSP card BF526.

    The result showed a significantly reduction of the sound pressure level (SPL) in the driver’s cabin. The noise attenuation obtained using the Feedback FxLMS was approximately 14 dB for a tonal 100 Hz signal and 11 dB using recorded engine noise from a forest machine at 850 rpm.

  • 7.
    Haake, Johan
    et al.
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
    Björk, Peter
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
    Karlsson, Johannes
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
    Demonstration Abstract: Positioning by Synchronized IR Light2014Conference paper (Refereed)
    Abstract [en]

    In this paper we will describe a positioning system based on synchronized IR light. Each node will be assigned a timeslot where they will send out an IR light. There is an IR camera that is also synchronized to the timeslots that will detect the position of each node and the ID that corresponds to the timeslot. To synchronize the clock of all nodes an IR flashlight is sent out that is detected by a photodiode on the nodes. The demo will show live video stream from a network camera where the ID and position of each node in view will be overlaid in real-time in the video. 

  • 8.
    Jorda, Andrei
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
    Automatisk mikrofonmixer2013Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
  • 9.
    Karlsson, Johannes
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
    Low-Complexity Encoding in Block-Based Hybrid Video Codecs by Moving Motion Estimation to Decoder Side2014In: International Journal of Adaptive, Resilient and Autonomic Systems, ISSN 1947-9220, E-ISSN 1947-9239, Vol. 5, no 1, p. 19-29Article in journal (Refereed)
    Abstract [en]

    In this paper the authors present an approach to provide efficient low-complexity encoding for the block-based video coding scheme. The authors present a method based on removing the most time-consuming task, that is motion estimation, from the encoder. Instead the decoder will perform motion prediction based on the available decoded frame and send the predicted motion vectors to the encoder. The results presented are based on a modified H.264 implementation. The results show that this approach can provide rather good coding efficiency even for relatively high network delays.

  • 10.
    Karlsson, Johannes
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
    Motion estimation on decoder side for low-complexity video encoding in wireless sensor networks2012In: 1st International Workshop on Wireless Multimedia Sensor Networks (WMSN'12),Barcelona, Spain, October 8-10, 2012, IEEE Computer Society, 2012Conference paper (Refereed)
  • 11.
    Karlsson, Johannes
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
    Two hop connectivity for uniformed randomly distributed points in the unit square2012In: International Journal of Wireless & Mobile Networks, ISSN 0975-4679, E-ISSN 0975-3834, Vol. 4, no 4, p. 1-12Article in journal (Refereed)
  • 12.
    Lind, Filip
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
    Inomhuspositionering av djur med hjälp av UWB-teknik och triangulering2016Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The project was about creating a Real Time Location System for indoor positioning of animals. The system uses Ultra-Wideband technology to measure distance to a number of base stations placed in an area around moving nodes which are going to be positioned. For positioning, triangulation is used. The project is about individually tracking each animal to optimize their breeding. The goal of the project is to finish a working system for testing in Sveriges lantbruksuniversitet’s research barn at Röbäck, Umeå, in the beginning of the summer. To create a complete system, source code from a product named TREK1000, by the Irish company DecaWave, has been ported to the decided modules. That can be done because TREK1000 is preforming the same task which this project is aiming to do. To preserve the applications functionality, only the platform-specific code needs to be changed.

    The project resulted in a working system for distance calculation between the Ultra-Wideband nodes. The ranging have a measured accuracy of +/- 30 centimeters which is really great compared to other alternatives. Only home testing is done so far and no testing of the system in the barn has been done yet. The hopes are that the same accuracy can be accomplished there. However, the final real time system for positioning is not working correctly since the positions of the nodes cannot be shown in the application. This application could later be extended to other applications other than animals, since it can be interesting to determine the position of other moving objects in other places. 

  • 13.
    Lovén, Jimmy
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
    Prototyputveckling av USB-växel2013Independent thesis Basic level (professional degree), 180 HE creditsStudent thesis
  • 14.
    Lu, Zhihan
    et al.
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics. SIAT, Chinese Academy of Science, China.
    ur Rehman, Shafiq
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics. SIAT, Chinese Academy of Science, China.
    Multi-Gesture based Football Game in Smart Phones2013In: SA '13 SIGGRAPH Asia 2013 Symposium on Mobile Graphics and Interactive Applications, NY, USA: Association for Computing Machinery (ACM), 2013Conference paper (Refereed)
  • 15.
    Lu, Zhihan
    et al.
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
    ur Réhman, Shafiq
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
    Touch-less interaction smartphone on go!2013In: Proceeding of SIGGRAPH Asia 2013, ACM New York, NY, USA, 2013Conference paper (Refereed)
    Abstract [en]

    A smartphone touch-less interaction based on mixed hardware and software is proposed in this work. The software application renders circle menu application graphics and status information using smart phone’s screen, audio. Augmented reality image rendering technology is employed for a convenient finger-phone interaction. The users interact with the application using finger gesture motion behind the camera, which trigger the interaction event and generate activity sequences for interactive buffers. The combination of Contour based Template Matching (CTM) and Tracking-Learning-Detection (TLD) provides a core support for hand-gesture interaction by accurately detecting and tracking the hand gesture.

  • 16.
    Lu, Zhihan
    et al.
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
    ur Réhman, Shafiq
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
    Chen, Ge
    Ocean University of China, Qingdao, China.
    WebVRGIS: WebGIS based interactive online 3D virtual community2013In: 2013 International Conference on Virtual Reality and Visualization (ICVRV 2013), Institute of Electrical and Electronics Engineers (IEEE), 2013, p. 94-99Conference paper (Refereed)
    Abstract [en]

    In this paper we present a WebVRGIS based Interactive Online 3D Virtual Community which is achieved based on WebGIS technology and web VR technology. It is Multi-Dimensional(MD) web geographic information system (WebGIS) based 3D interactive online virtual community which is a virtual real-time 3D communication systems and web systems development platform. It is capable of running on a variety of browsers. In this work, four key issues are studied: (1) Multi-source MD geographical data fusion of the WebGIS, (2) scene combination with 3D avatar, (3) massive data network dispatch, and (4) multi-user avatar real-time interactive. Our system is divided into three modules: data preprocessing, background management and front end user interaction. The core of the front interaction module is packaged in the MD map expression engine 3GWebMapper and the free plug-in network 3D rendering engine WebFlashVR. We have evaluated the robustness of our system on three campus of Ocean University of China(OUC) as a testing base. The results shows high efficiency, easy to use and robustness of our system.

  • 17.
    Lu, Zhihan
    et al.
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
    ur Réhman, Shafiq
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
    Khan, Muhammad Sikandar Lal
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
    Li, Haibo
    Royal Institute of Technology (KTH), Sweden..
    Anaglyph 3D stereoscopic visualization of 2D video based on fundamental matrix2013In: Proceedings of 2013 International Conferenceon Virtual Reality and Visualization (ICVRV 2013), 14-15 September 2013, Xi'an, Shaanxi, China, 2013Conference paper (Refereed)
    Abstract [en]

    In this paper, we propose a simple Anaglyph 3Dstereo generation algorithm from 2D video sequence with monocularcamera. In our novel approach we employ camera poseestimation method to directly generate stereoscopic 3D from 2Dvideo without building depth map explicitly. Our cost effectivemethod is suitable for arbitrary real-world video sequence andproduces smooth results. We use image stitching based on planecorrespondence using fundamental matrix. To this end we alsodemonstrate that correspondence plane image stitching based onHomography matrix only cannot generate better result. Furthermore,we utilize the structure from motion (with fundamentalmatrix) based reconstructed camera pose model to accomplishvisual anaglyph 3D illusion. The proposed approach demonstratesa very good performance for most of the video sequences.

  • 18.
    Mikkelsen, Markus
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
    Development, Modelling and Control of a Multirotor Vehicle2015Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    The interest of drones in all forms has exploded in the recent years. The development of multirotor vehicles such as quadcopters and octocopters, has reached a point where they are cheap and versatile enough to start becoming a part of everyday life. It is clear to say that the future applications seem limitless. This thesis goes through the steps of development, modelling and control design of an octocopter system. The developed octocopter builds on a concept of using the mini computer Raspberry Pi together with the code generation functionality of Matlab/Simulink. The mathematical modelling of the octocopter includes the thrust and torques generated by the propellers, added with gyroscopic torque. These are combined with the aerodynamic effects caused by incoming air. The importance of modelling the later mentioned effects has increased with the demand of precise controlled extreme manoeuvres. A full state feedback based hybrid controller scheme is designed against a linearized model, which makes use of the motor dynamics. The controllers show good performance in simulations and are approved for flight tests, which are conducted on two separate occasions. The octocopter makes two successful flights, proving that the concept can be applied on multirotor vehicles. However, there is a miss-match between the mathematical model and the physical octocopter, leaving questions for future work.

  • 19.
    Olofsson, Petter
    et al.
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
    Utterström, Jimmy
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
    Hydraulstyrning med konfiguration över Bluetooth2016Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This report encompasses the development of a standalone drive card with an accompanying mobile application for control and configuration of a hydraulic system. The purpose of the project was to - according to an inquiry from the client Bosch Rexroth - investigate whether the pump control module (PCM) from the existing Spider 3 control system could be used as a standalone module. Hardware including a Bluetooth module was assembled and connected to the PCM to allow communication over Bluetooth Low Energy (BLE). A mobile application where developed in Android Studio to allow configuration from a mobile device. The software of the PCM were modified to communicate with the Bluetooth hardware over CAN and also for allowing analog control of the hydraulic pump through a current controlled input.The basic demands for the system were met and a working prototype could be demonstrated at the end of the project. The prototype did show large potential but was lacking some functionality which would be desirable for a commercial product.

  • 20.
    Olsson, Alexander
    Umeå University, Faculty of Science and Technology, Department of Physics.
    Meshnetwork of wireless IoT sensors2016Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    The Internet of things is a scenario where devices such as lighting, household appliances, sensors etc. are connected and communicate with each other via Internet. This puts a demand for a good infrastructure around these devices. One way to handle this is to use radio as a means of communication and let the devices forward each other's traffic in what is known as a mesh network.

    This thesis explores different radio standards that can be used to create a mesh network for sensors. Two different approaches to mesh networking using Bluetooth Low Energy was implemented and evaluated. One approach works by letting all devices broadcast every message they receive, a rather brute force approach. The other approach worked by letting the network find routes between all the nodes in the network and then establishes a connection between the nodes that want to communicate via intermediate nodes.

    It was found that the rebroadcast approach in idle mode used 3.36 mAh while the connection approach used 0.47 mAh for the same configuration. Another test was performed where the percentage of successfully delivered messages was measured. For the rebroadcast approach it was 75 % and for connection it was 58 %. Tweaking the connection network to not be able to adapt to changes increased the throughput to 77 %.

    During the testing numerous ways for improving performance were thought of but not implemented. The need for synchronizing the devices clocks and establishing protocol for when to send and receive became apparent when working with the rebroadcast network. In the connection network there were problems with that the routing maintenance led to unavailable units and reduced performance.

  • 21.
    Ren, Keni
    et al.
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
    Karlsson, Johannes
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
    Animal Tracking in Multi-Modal Wireless Sensor Networks2012In: SNCNW 2012 ( the 8th Swedish National Computer Networking Workshop), June 7-8, 2012, 2012Conference paper (Refereed)
  • 22.
    Savas, Süleyman
    et al.
    School of Information Technology, Halmstad University, Halmstad, Sweden; Department of Computers Science, Lund University, Lund, Sweden.
    Ul-Abdin, Zain
    School of Information Technology, Halmstad University, Halmstad, Sweden.
    Nordström, Tomas
    Umeå University.
    A framework to generate domain-specific manycore architectures from dataflow programs2020In: Microprocessors and microsystems, ISSN 0141-9331, E-ISSN 1872-9436, Vol. 72Article in journal (Refereed)
    Abstract [en]

    In the last 15 years we have seen, as a response to power and thermal limits for current chip technologies, an explosion in the use of multiple and even many computer cores on a single chip. But now, to further improve performance and energy efficiency, when there are potentially hundreds of computing cores on a chip, we see a need for a specialization of individual cores and the development of heterogeneous manycore computer architectures.

    However, developing such heterogeneous architectures is a significant challenge. Therefore, we propose a design method to generate domain specific manycore architectures based on RISC-V instruction set architecture and automate the main steps of this method with software tools. The design method allows generation of manycore architectures with different configurations including core augmentation through instruction extensions and custom accelerators. The method starts from developing applications in a high-level dataflow language and ends by generating synthesizable Verilog code and cycle accurate emulator for the generated architecture.

    We evaluate the design method and the software tools by generating several architectures specialized for two different applications and measure their performance and hardware resource usages. Our results show that the design method can be used to generate specialized manycore architectures targeting applications from different domains. The specialized architectures show at least 3 to 4 times better performance than the general purpose counterparts. In certain cases, replacing general purpose components with specialized components saves hardware resources. Automating the method increases the speed of architecture development and facilitates the design space exploration of manycore architectures.

  • 23.
    Shafiq, ur Réhman
    et al.
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
    Li, Haibo
    Royal Institute of Technology (KTH), Sweden..
    Using Vibrotactile Language for Multimodal Human Animals Communication and Interaction2014In: Proceedings of the 2014 Workshops on Advances in Computer Entertainment Conference, ACE '14, Association for Computing Machinery (ACM), 2014, p. 1:1-1:5Conference paper (Refereed)
    Abstract [en]

    In this work we aim to facilitate computer mediated multimodal communication and interaction between human and animal based on vibrotactile stimuli. To study and influence the behavior of animals, usually researchers use 2D/3D visual stimuli. However we use vibrotactile pattern based language which provides the opportunity to communicate and interact with animals. We have performed experiment with a vibrotactile based human-animal multimodal communication system to study the effectiveness of vibratory stimuli applied to the animal skin along with audio and visual stimuli. The preliminary results are encouraging and indicate that low-resolution tactual displays are effective in transmitting information.

  • 24.
    Stymne, Petter
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
    Säkerhetskritiska standarder och FPGA2013Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    IEC 61508, ISO 26262, DO-254 och CENELEC EN 5012x är alla standarder för utveckling av säkerhetskritiska system. Dessa fyra är applicerbara på bilar upp till 3.5 ton (ISO 26262), flyg (DO-254), tåg (Cenelec EN 5012x) samt IEC 61508 vilket är en standard för flertalet industrigrenar.

    När ett säkerhetskritiskt system skall implementeras i en FPGA så kan problem uppstå. Detta för att en FPGA ibland räknas till hårdvara men utvecklingen följer samma mönster som mjukvaruutveckling. Detta examensarbetes huvuduppgift är att klargöra hur de olika standarderna ser på FPGA utveckling samt verifiering med hjälp av utökad funktionell verifiering.

    Uppsatsen är uppdelad i två delar. Den första delen behandlar de säkerhetskritiska standarderna. Vi kommer att gå igenom dessa för att få en översikt samt visa vilka skillnader likheter som finns. Hur ställer de sig till FPGA, hårdvara eller mjukvara.

    Del två går igenom ett projekt i enlighet med IEC 61508, inklusive metoder för funktionell verifiering ingå. Dessa metoder är ABV (Assertion Based Verification) samt täckningsgrad för verifieringen. Har vi verifierat tillräckligt och vilka krav ställs på ett projekt enligt IEC 61508. I den här delen går vi även igenom hur de olika standarderna ser på FPGA:er samt några rekommendationer gällande FPGA utveckling och säkerhetskritiska system.

  • 25.
    Stymne, Petter
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
    Säkerhetskritiska standarder och FPGA2013Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    IEC 61508, ISO 26262, DO-254 och CENELEC EN 5012x är alla standarder för utveckling av säkerhetskritiska system. Dessa fyra är applicerbara på bilar upp till 3.5 ton (ISO 26262), flyg (DO-254), tåg (Cenelec EN 5012x) samt IEC 61508 vilket är en standard för flertalet industrigrenar.

    När ett säkerhetskritiskt system skall implementeras i en FPGA så kan problem uppstå. Detta för att en FPGA ibland räknas till hårdvara men utvecklingen följer samma mönster som mjukvaruutveckling. Detta examensarbetes huvuduppgift är att klargöra hur de olika standarderna ser på FPGA utveckling samt verifiering med hjälp av utökad funktionell verifiering.

    Uppsatsen är uppdelad i två delar. Den första delen behandlar de säkerhetskritiska standarderna. Vi kommer att gå igenom dessa för att få en översikt samt visa vilka skillnader likheter som finns. Hur ställer de sig till FPGA, hårdvara eller mjukvara.

    Del två går igenom ett projekt i enlighet med IEC 61508, inklusive metoder för funktionell verifiering ingå. Dessa metoder är ABV (Assertion Based Verification) samt täckningsgrad för verifieringen. Har vi verifierat tillräckligt och vilka krav ställs på ett projekt enligt IEC 61508. I den här delen går vi även igenom hur de olika standarderna ser på FPGA:er samt några rekommendationer gällande FPGA utveckling och säkerhetskritiska system.

  • 26.
    Sundh, Roger
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
    Generellt mät- och styrsystem2014Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The purpose of this thesis work was to create a general measurement and control system, which is remotely controlled using Internet. The system comprises a controlling computer and several separate modules, each one realizing one or more measurement and control tasks. The possibilities of such a system are wide. It could be used for home automation, industrial process control or by the entertainment business. For example, the system can implement measurement of temperature, distance, pressure and light and control servos, lamps and general digital outputs.A fully implemented system comprises over 100 separate modules, so for practical reasons this thesis work was restricted to only implementing and demonstrating a few of those modules. Since the system is easily scalable, this was a minor restriction, which did not negatively affect the results.The results show that the system works and in general the latency is low. Fast real time processes will not work, but most applications with more moderate timing demands are ideally suited for this system.

  • 27.
    Thelander Lööf, Hans
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
    Att styra en konferensenhet med gester2018Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The project is conducted in cooperation with a company that manufactures conference units. Conference units usually consist of a user interface aimed at the person who sets up the meeting, limiting the other participants' ability to interact with the device. The purpose of the project is to facilitate other participants to interact with conference units, which can be done by means of gestures. The aim of the project is to produce a product for evaluation and testing. The product should be able to convert detected gestures to commands to control speaker volume and microphone. After a comparison of different methods and techniques, a phase-based gesture detection was selected with an infrared proximity sensor. Two PCBs were made, one consisting of a microcontroller and one consisting of a proximity sensor with three infrared LEDs. A software was developed for gesture detection. Test was done with hand movements to the right, left, up and down with a distance of approx. 30 cm between hand and sensor. The result shows a gesture detection of four different gestures. In future developments, these can be converted into commands that can control speaker volume as well as microphone on conference device.

  • 28.
    Tjällskog, David
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
    Optimering av ultraljudssändare- och mottagare avseende räckvidd, strålningsvinkel och energiförbrukning2014Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Embedded Systems Lab at Umeå University is currently part of a research project with the purpose to examine the behavior of dairy cows inside a barn. Each cow needs to be tracked with a precision of 50 cm, and since GPS-technique has poor functionality at indoor environments, an indoor positioning system needs to be developed.

    Embedded Systems Lab has already developed an indoor positioning system using IR-light and radio, but since this system demands extensive infrastructure and is rather expensive, an alternate positioning system using ultrasonic pulses and radio is being examined.

    In this report the range, beam angle and current consumption of ultrasonic transmitters- and receivers are investigated. Three different driver stages for the transmitter is tested, and two amplifier solutions for the receiver. The report also describes how the length of the transmitted ultrasonic pulse affects the received signal, accessibility of a “shadowed” signal, and the effect of different sound frequency.

  • 29.
    Vidmark, Stefan
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
    Röstigenkänning med Movidius Neural Compute Stick2018Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Omicron Ceti AB company had an Intel Movidius Neural Compute Stick (NCS), which is a usb device that may be loaded with neural networks to process data. My assignment was to study how NCS is used and to make a guide with examples. Using TensorFlow and the TFLearn help library a test network was made for the purpose of trying the work pipeline, from network training to using the NCS. After that a network was trained to classify 14 different words. Many different configurations of the network were tried, until a good example was found that was expanded upon until an accuracy of 86% with the test data was reached. The accuracy when speaking into a microphone was a bit worse at 67%. To process data with the NCS took a longer time than with TFLearn but used a lot less CPU power. However it’s not even possible to use TensorFlow/TFLearn in smaller systems like a Raspberry Pi, so whether it’s worth using the NCS depends on the specific usage scenario.

  • 30.
    Viklander, Johan
    Umeå University, Faculty of Science and Technology, Department of Physics.
    Simulation of a TCU Node on a Virtual CAN Bus2016Independent thesis Advanced level (degree of Master (Two Years)), 300 HE creditsStudent thesis
    Abstract [en]

    Electrical Control Units (ECUs) communicating on Controller Area Networks (CAN buses) are widely used in vehicle electrical systems. Being able to simulate these circuits and buses in a computer environment is beneficial during the development phase when access to test benches is limited and expensive. Simulations can also give a very detailed view of the entire system which in an ordinary lab setup would be practically impossible.

    BAE Systems Örnsköldsvik SIL Lab department works in the simulation environment CANoe supplied by Vector Informatik GmbH. BAE Systems have a simulation model of their central communication circuit. Unlike the less complicated circuits on the bus it cannot be integrated in the CANoe simulation environment. The less complicated nodes are modelled to usable extent but this is not possible with the central communication circuit. This report presents a possible solution to facilitate communication between the simulated ECU and the CANoe simulation environment under certain real-time constraints.

    A solution was achieved with a combination of an external program which handled shared memory with callback functions and Vector's Fast Data eXchange protocol (FDX).

  • 31.
    Wennström, Christoffer
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
    Kontinuerlig temperaturmätning i bädden på gratevagnar2012Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Luossavaara-Kiirunavaara Aktiebolag (LKAB) is a mining group with iron ore mining as the main business. One of the products is produced by refining iron ore to iron pellets, which is a quality and environmentally clever product  in steel production.

                                       

    When iron pellets are produced by roasting green pellets the temperature is very important. The goal is to get as much oxidation as possible from hematite to magnetite and to get correct mechanical properties. To control the process it’s important to know the temperature of the green pellets specifically and not the surrounding mechanical structure, ceramics lining in the furnace and the influence from radiation.

     

    The goal of the project is to examine possibilities to measure temperature with a permanent measurement system of green pellets which are transported on grate cars trough pellet plant. The measurement system has to meet some requirements of environment, portability and operating time.

    Analysis of the environment has been made to get specification of what a measurement system has to withstand. Proposition about assembly location has been investigated by analysis of the environment. A thermal analysis has been made of electronic components, especially electronic components that can be used in a measurement system. A analysis has also been made of which electronic components that are suited for a measurement system and can withstand the heat. A development measurement system has been developed from the results of the analysis. The system has been constructed to measure the temperature of what a system can be exposed of on a grate car. This with wireless and data-logging support and future measurements possibilities with three thermocouples of type S.

     

    Wireless data transfer was examined to see what type is most suited for the task with knowledge of environment, transmission range, radiation and power consumption. Power sources was examined to find a power source with longest working time and highest functionality. Heat insulation and reflective materials has been investigated with the goal to get the temperature in the system enclosure as low as possible. Some different types of temperature sensors that can measure temperatures up to 1500°C and which can be mounted on a grate car has been evaluated.

  • 32.
    Yekeh, Farahnaz
    et al.
    Umeå University, Faculty of Science and Technology, Department of Computing Science.
    Pordel, Mostafa
    Umeå University, Faculty of Science and Technology, Department of Computing Science.
    Almeida, Luís
    University of Porto.
    Behnam, Moris
    Mälardalen University.
    Portugal, Paulo José
    University of Porto.
    Exploring alternatives to scale FTT-SE to large networks2011In: 6th IEEE International Symposium on Industrial Embedded Systems, 2011Conference paper (Refereed)
    Abstract [en]

    Nowadays, most complex embedded systems follow a distributed approach in which a network interconnects potentially large numbers of nodes. One technology that is being increasingly used is switched Ethernet, but real-time variants of this protocol typically limit scalability. In this paper, we focus on the scalability of the Flexible Time Triggered communication over Switched Ethernet (FTT-SE), which has been proposed to support hard real-time applications in a flexible and predictable manner. Moreover, time-triggered and event-triggered communication methods are supported in this protocol. FTT-SE has already been explored and investigated for small scale networked applications. In this paper we address the protocol scalability and suggest three different solutions with a qualitative assessment. © 2011 IEEE.

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