Cheung Cheuk Lun. / Thesis submitted in: July 2004. / Thesis (M.Phil.)--Chinese University of Hong Kong, 2005. / Includes bibliographical references (leaves 109). / Abstracts in English and Chinese. / Abstract --- p.1 / Chapter 1 --- Introduction --- p.3 / Chapter 1.1 --- Differentiation from existing products --- p.6 / Chapter 1.2 --- Problems --- p.6 / Chapter 1.3 --- Assumption --- p.9 / Chapter 2 --- Study of bulk transfer --- p.10 / Chapter 2.1 --- Simple wireless solution --- p.10 / Chapter 2.2 --- Problems of the simple wireless solution --- p.10 / Chapter 2.2.1 --- Low performance due to header overhead --- p.12 / Chapter 2.2.2 --- Low performance due to unnecessary packets --- p.12 / Chapter 2.2.3 --- Model derivation --- p.12 / Chapter 2.2.4 --- Performance study --- p.17 / Chapter 2.3 --- Packed wireless solution --- p.19 / Chapter 2.3.1 --- Example --- p.19 / Chapter 2.3.2 --- Solved problems --- p.21 / Chapter 2.3.3 --- Model derivation --- p.22 / Chapter 2.3.4 --- Performance study --- p.24 / Chapter 2.3.4 --- Performance study on the effect of the value of n --- p.25 / Chapter 2.4 --- Controllable packed wireless solution --- p.27 / Chapter 2.4.1 --- Problem --- p.27 / Chapter 2.4.2 --- Analysis --- p.27 / Chapter 2.4.3 --- Solution --- p.29 / Chapter 2.4.4 --- Model derivation --- p.33 / Chapter 2.4.5 --- Performance study --- p.35 / Chapter 2.4.6 --- Performance study on the effect of the sliding window size --- p.36 / Chapter 2.5 --- Summary of performance study --- p.41 / Chapter 2.5.1 --- Comparison of the throughput between four cases --- p.41 / Chapter 2.5.2 --- Study of how the throughput-varies with the processing time --- p.44 / Chapter 2.6 --- Simulation --- p.47 / Chapter 2.6.1 --- Measuring the packet loss rate and the throughput --- p.49 / Chapter 2.6.2 --- Studying the throughput against the distance --- p.50 / Chapter 2.6.3 --- Studying the throughput against the packet loss rate --- p.53 / Chapter 2.7 --- Conclusion --- p.54 / Chapter 3 --- Study of interrupt transfer --- p.55 / Chapter 3.1 --- Problem --- p.55 / Chapter 3.2 --- Solution --- p.56 / Chapter 3.2.1 --- Remote polling --- p.56 / Chapter 3.3 --- Feasibility of the solution --- p.58 / Chapter 3.4 --- The problem of Distributed Coordination Function collision --- p.60 / Chapter 3.5 --- Collision avoidance --- p.60 / Chapter 3.6 --- Model derivation --- p.61 / Chapter 3.6.1 --- Wired case --- p.61 / Chapter 3.6.2 --- Wireless solution (remote polling) --- p.62 / Chapter 3.7 --- Maximum allowed request generation frequency --- p.64 / Chapter 3.7.1 --- More than one interrupt transfer --- p.64 / Chapter 3.7.2 --- More than one bulk transfer --- p.64 / Chapter 3.7.3 --- Maximum allowed request generation frequency --- p.65 / Chapter 3.8 --- Conclusion --- p.65 / Chapter 4 --- System architecture issues --- p.66 / Chapter 4.1 --- USB network --- p.66 / Chapter 4.1.1 --- Problems --- p.66 / Chapter 4.1.2 --- Solution --- p.66 / Chapter 4.1.3 --- Conclusion --- p.69 / Chapter 4.2 --- Security --- p.70 / Chapter 4.2.1 --- Suggested solution --- p.70 / Chapter 4.2.2 --- Conclusion --- p.72 / Chapter 4.3 --- Cost --- p.72 / Chapter 4.4 --- Power supply --- p.73 / Chapter 5 --- Conclusion --- p.75 / Appendix --- p.77 / Chapter A. --- Wireless USB (WUSB) --- p.77 / Chapter B. --- Introduction of USB --- p.83 / Chapter C. --- Framing details of 802.11 --- p.99 / Chapter D. --- A case study of a USB device --- p.102 / Chapter E. --- Reference of notations used in figures --- p.106 / Chapter F. --- Values of all symbols --- p.107 / Reference i --- p.109

<p>GNU Radio is a software framework allowing easy creation of digital signal processing applications on a regular PC. The Universal Software Radio Peripheral (USRP) is a hardware component that can be used as a radio front-end and that is connected to a PC using USB. GNU Radio and the USRP together form a system for software-defined radio. The purpose of this thesis project have been to insert a large programmable logic circuit into the system that GNU Radio and the USRP together form. The goal of this is to make it possible to move parts of the signal processing away from GNU Radio and instead implement these parts in hardware. Possibilities for doing this has been analyzed and one of the possible systems performing this has been designed.</p>

<p>Acreo AB has developed a radar prototype used for illustrate how the SiGe technology could be used. The radar prototype needs further development with a fast interface and a more integrated design. The beginning of the report describes the radar technique theory and the composing equations. The theoretical background is used to explain each component of the system. The report continues by specifying the target of the next radar prototype. The chosen implementation is motivated and the mode of procedure is described in detail. Test benches were used to verify correct functionality and some limits were found. The report is concluded with test results and recommendations on further enhancements.</p> / <p>Acreo AB har utvecklat en radarprototyp för att illustrera hur SiGe teknologi kan användas. Prototypen behöver vidareutvecklas med ett snabbt digitalt interface och en kompaktare design. Rapporten inleds med att beskriva radarteknikens funktionalitet och de utgörande ekvationerna. Den teoretiska bakgrunden används för att förklara varje komponent som systemet utgörs av. Rapporten fortsätter med att specificera målet med nästa radarprototyp. Den valda implementationen motiveras och tillvägagångssättet beskrivs detaljerat. Testuppkopplingar verifierade korrekt funktionalitet och begränsningar insågs. Rapporten avslutas med en sammanfattning av uppnådda testresultat och rekommendationer på framtida förbättringar.</p>

<p>Today the Sjöbjörn studio has a mixing console controlled by a PC with outdated software and</p><p>hardware technology. The hardware requires an ISA-bus to work at all and thereby limits the</p><p>upgrades that can be made to the computer. The software runs in a DOS environment and has not</p><p>been updated for a long time as well. This makes working with the mixing console more difficult</p><p>then it has to be and new features are hard to implement. In this thesis I have developed new</p><p>hardware so that a more powerful computer can be used which hopefully will allow for a more</p><p>user friendly interface and make it easier for future upgrades and additions.</p><p>The thesis presents a solution on how to upgrade the system all the way from the PCcommunication</p><p>to the hardware designs.</p><p>The project was based around the Microchip PIC18F4550 microcontroller for the hardware and</p><p>the Visual Basic.NET programming language for the PC software.</p>

GNU Radio is a software framework allowing easy creation of digital signal processing applications on a regular PC. The Universal Software Radio Peripheral (USRP) is a hardware component that can be used as a radio front-end and that is connected to a PC using USB. GNU Radio and the USRP together form a system for software-defined radio. The purpose of this thesis project have been to insert a large programmable logic circuit into the system that GNU Radio and the USRP together form. The goal of this is to make it possible to move parts of the signal processing away from GNU Radio and instead implement these parts in hardware. Possibilities for doing this has been analyzed and one of the possible systems performing this has been designed.

Detta examensarbete gjordes under hösten 2011 och beställdes av Accesia AB, som ville tafram en prototyp till ett elektroniskt verktyg för mätning av tandfickors djup, kallatfickdjupsmätning. Verktyget är tänkt att användas vid veterinärtandvård för hundar och katter.Detta är en procedur som idag görs med en graderad sticka och som ger upphov till risk förfelaktiga avläsningar. Användaren ska med hjälp av mätutrustningen kunna mäta fickdjupelektroniskt. Systemet presenterar sedan mätvärdena och skickar dessa till en värddator.I rapporten beskrivs hur vi har gått tillväga från idé till färdig prototyp. Slutresultatet ska intebetraktas som en färdig produkt, utan snarare som en illustration av konceptet. Resultatetstämde överrens med den kravspecifikation som togs fram i samråd med projektbeställaren. / This thesis work was made in autumn 2011 and was commissioned by Accesia AB, whowanted to develop a prototype of an electronic tool for measuring periodontal pockets depth.The tool is supposed to be used in veterinary dental examinations for dogs and cats. This is aprocedure that is currently done with a graded stick and gives rise to the risk of false readings.The user should be able to use the measuring equipment to measure pocket depthelectronically. The system then presents readings and sends them to a host computer.The report describes how we have proceeded from idea to prototype. The end result should notbe regarded as a finished product, but rather as a proof of concept. The result complies with theproject specification that was developed in consultation with the project client.

Acreo AB has developed a radar prototype used for illustrate how the SiGe technology could be used. The radar prototype needs further development with a fast interface and a more integrated design. The beginning of the report describes the radar technique theory and the composing equations. The theoretical background is used to explain each component of the system. The report continues by specifying the target of the next radar prototype. The chosen implementation is motivated and the mode of procedure is described in detail. Test benches were used to verify correct functionality and some limits were found. The report is concluded with test results and recommendations on further enhancements. / Acreo AB har utvecklat en radarprototyp för att illustrera hur SiGe teknologi kan användas. Prototypen behöver vidareutvecklas med ett snabbt digitalt interface och en kompaktare design. Rapporten inleds med att beskriva radarteknikens funktionalitet och de utgörande ekvationerna. Den teoretiska bakgrunden används för att förklara varje komponent som systemet utgörs av. Rapporten fortsätter med att specificera målet med nästa radarprototyp. Den valda implementationen motiveras och tillvägagångssättet beskrivs detaljerat. Testuppkopplingar verifierade korrekt funktionalitet och begränsningar insågs. Rapporten avslutas med en sammanfattning av uppnådda testresultat och rekommendationer på framtida förbättringar.

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Given that phishing is an ever increasing problem, a better authentication system than the current alphanumeric system is needed. Because of the large number of current authentication systems that use alphanumeric passwords, a new solution should be compatible with these systems. We propose a system that uses a graphical password deployed from a Trojan and virus resistant embedded device as a possible solution. The graphical password would require the user to choose a family photo sized to 441x331 pixels. Using this image, a novel, image hash provides an input into a cryptosystem on the embedded device that subsequently returns an encryption key or text password. The graphical password requires the user to click five to eight points on the image. From these click-points, the embedded device stretches the graphical password input to a 32- character, random, unique alphanumeric password or a 256-bit AES key. Each embedded device and image are unique components in the graphical password system. Additionally, one graphical password can generate many 32-character unique, alphanumeric passwords using its embedded device which eliminates the need for the user to memorize many passwords. / Computer Engineering

USB-minnen är ett portabelt lagringsmedium som går att hitta nästan överallt i dags-läget. Dessa enheter gör det möjligt att lätt spara filer och flytta dem till andra platser. Studien har som syfte att undersöka hur personal på kommunkontor i mindre kom-muner inom Skaraborg använder USB-minnen. Mindre kommuner har det ofta svårtatt anställa kvalificerad personal samt att få ekonomin att gå ihop. Trotts detta för-utsätts att de fortfarande följer samma lagar och utför samma uppgifter som störrekommuner. För att nå ut till kommuner baserades urvalet på medlemskommunernai Skaraborg kommunalförbund, av dessa kommuner uppfyllde tio kommuner kravetpå att vara en mindre kommun.Personalen fick sedan besvara en enkät om USB-minnen. Totalt inkom 30 unika svarfrån 7 olika kommuner.Svaren analyserades sedan och visar på att: Personalen är medvetna vad USB-minnen är och de tillåts använda dessa på kontoren.Enbart en dryg tredjedel hade fått information om hur de skulle hantera USB-minnen.Användningen skiljde sig mellan personalen en dryg tredjedel uppgav att de användeUSB-minnen för att lagra filer, likaså flytta filer. En dryg tredjedel uppgav att de hadetagit med sig USB-minnen utanför arbetsplatsen. Oberoende av användningsområdetär presentationer den vanligaste filtypen på USB-minnet.