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The Institute of Electrical and Electronics Engineers (IEEE) 802.15.4 standard presents a very useful technology for implementing low-cost, low-power, wireless sensor networks. Its main focus, which is to applications requiring simple wireless connectivity with relaxed throughout and latency requirements, makes it suitable for connecting devices that have not been networked, such as industrial and control instrumentation equipments, agricultural equipments, vehicular equipments, and home appliances. Its usage of the license-free 2.4 GHz frequency band makes the technique successful for fast and worldwide market deployments. However, concerns about interference have arisen due to the presence of other wireless technologies using the same spectrum. Although the IEEE 802.15.4 standard has provided some mechanisms, to enhance capability to coexist with other wireless devices operating on the same frequency band, including Carrier Sensor Multiple Access (CSMA), Clear Channel Assessment (CCA), channel alignment, and low duty cycle, it is essential to design and implement adjustable mechanisms for an IEEE 802.15.4 based system integrated into a practical application to deal with interference which changes randomly over time. Among the potential interfering systems (Wi-Fi, Bluetooth, cordless phones, microwave ovens, wireless headsets, etc) which work on the same Industrial, Scientific, and Medical (ISM) frequency band, Wi-Fi systems (IEEE 802.11 technique) have attracted most concerns because of their high transmission power and large deployment in both residential and office environments. This thesis aims to propose a methodology for IEEE 802.15.4 wireless systems to adopt proper adjustment in order to mitigate the effect of interference caused by IEEE 802.11 systems through energy detection, channel agility and data recovery. The contribution of this thesis consists of five parts. Firstly, a strategy is proposed to enable IEEE 802.15.4 systems to maintain normal communications using the means of consecutive transmissions, when the system s default mechanism of retransmission is insufficient to ensure successful rate due to the occurrence of Wi-Fi interference. Secondly, a novel strategy is proposed to use a feasible way for IEEE 802.15.4 systems to estimate the interference pattern, and accordingly adjust system parameters for the purpose of achieving optimized communication effectiveness during time of interference without relying on hardware changes and IEEE 802.15.4 protocol modifications. Thirdly, a data recovery mechanism is proposed for transport control to be applied for recovering lost data by associating with the proposed strategies to ensure the data integrity when IEEE 802.15.4 systems are suffering from interference. Fourthly, a practical case is studied to discuss how to design a sustainable system for home automation application constructed on the basis of IEEE 802.15.4 technique. Finally, a comprehensive design is proposed to enable the implementation of an interference mitigation strategy for IEEE 802.15.4 based ad hoc WSNs within a structure of building fire safety monitoring system. The proposed strategies and system designs are demonstrated mainly through theoretical analysis and experimental tests. The results obtained from the experimental tests have verified that the interference caused by an IEEE 802.11 system on an IEEE 802.15.4 system can be effectively mitigated through adjusting IEEE 802.15.4 system s parameters cooperating with interference pattern estimation. The proposed methods are suitable to be integrated into a system-level solution for an IEEE 802.15.4 system to deal with interference, which is also applicable to those wireless systems facing similar interference issues to enable the development of efficient mitigation strategies.

Imagine one million and six hundred thousand years ago — a prehistoric character points. There in the moistened soil, the hominid Homo habilis draws a line, inscribing with her finger the first mark. At the core of my work is a meditation on this very scene as the otherwise unknowable origins of image making. And at the center of this discovery is a prehistoric woman — a previously invisible character within human evolution. My work aims to insert these characters into the origins of tool use, image making, and other supposed markers of humanness while also examining historical representations of women. Like science fiction, the field of physical anthropology allows me to reimagine our past, or even our future, with a criticality of the ways in which patriarchal and religious structures have shaped our understanding of human evolution and our representations of our past. In substituting aliens for extinct species of human ancestors and the unknown of space for the primordial earth as we will never know it, I have a vast imaginable world within which to invent and recreate narratives of origin and discovery.

M.A. (Semitic Languages and Cultures) / Please refer to full text to view abstract

Chronologically I have described the different environments that I have been exposed to in the past five years and how my interactions with the different locations have affected my work. I started writing about what I was doing a year after finishing my undergraduate degree, when I started to feel as though I needed to re-invent my work in a way that also meant trying to see the process of creating art differently. I didn't know yet how this new work would begin to generate, or what would inspire it, but I knew that I was seeking a studio practice that would be personal enough to sustain a lifetime of exploration. In the end I found the inspiration had always been all around me.

The aim of this work is to examine the application Topocoding API and Google Maps API. Analyze system requirements to define the coverage of wireless connectivity to allow the ISP so as to allow the ISP to file AP and customers, as well as exploring the possibilities of joining the AP ISP and view coverage maps. Further, this application design, implement and test.

Det finns inte mycket forskning på ämnet förtexter, speciellt inte i film som utspelar sig i framtiden. Uppsatsens syfte är att undersöka förtextens form och funktion utifrån en semiotisk analys som använder sig av de begrepp semiotiken medför i tolkandet av tecken. De två frågeställningar i arbetet är “I tolkandet av förtexten utifrån semiotisk analys, vilka val och budskap går att finna i förtextens form?” och “Vilka funktioner fyller de utvalda förtexterna för filmernas narrativ?”   I urvalet av filmerna utgick jag från filmer som utspelas i framtiden, detta för att möjliggöra ett eventuellt eget och nytt uttryck för den tid då filmerna utspelar sig. Filmerna är Alien (Ridley Scott, 1979), Brazil (Terry Gilliam, 1985) och The Matrix (Lana och Lilly Wachowski, 1999). Dessa filmer utgår också från tre decennier. Mitt material för att göra analyserna utgick från hermeneutisk metod tillsammans med semiotisk analys. För att kunna tolka de tecken och begrepp som semiotiken medför utgick jag ifrån bl.a. texter av Gripsruds och Bignell. Detta förenat med historia och förhållningssätt till titeldesign, samt information om filmerna och deras produktioner. Uppsatsen resultat framställer att förtexternas form följer filmens funktioner i alla tre filmerna. Analyserna tydliggör att de val som gjorts i skapande ofta går att härleda direkt till filmens narrativ eller konceptuella idéer om varför titelsekvensen uppfattas som den gör utifrån de semiotiska begreppen. Samtidigt visar resultatet att förtextens design skulle vara ett tydligt sätt för att utöka filmens värld ytterligare och skapa ett sammanhängande uttryck till filmernas paketering och marknadsföring.

The goal of this thesis was to develop, deploy and evaluate a lightweight portable intrusion detection system (LPIDS) over wireless networks. The LPIDS was developed by adopting two different string matching algorithms: Aho-Corasick algorithm and Knuth–Morris–Pratt algorithm (KMP). The LPIDS was implemented and tested on the hardware platforms Wi-Fi Pineapple and Raspberry Pi. To evaluate and test the LPIDS as well as the algorithms, performance metrics such as throughput, response time and power consumption are considered. The experimental results reveal that Aho-Corasick performed better than KMP throughout the majority of the process, but KMP was typically faster in the beginning with fewer rules. Similarly, Raspberry Pi shows remarkably higher performance than Wi-Fi Pineapple in all of the measurements. Moreover, we compared the throughput between LPIDS and Snort. It was concluded that the throughput was significantly higher for LPIDS when most of the rules do not include content parameters. This thesis concludes that due to computational complexity and slow hardware processing capabilities of Wi-Fi Pineapple, it could not become suitable IDS in the presence of different pattern matching strategies. Finally, we propose a modification of Snort to increase the throughput of the system.

Wireless communication is important in data transportation between devices. It is as ever important to find the best connection fitted for the users specific requirements. This process can be a hassle and having an application testing all the options could save both time and resources. This project involves solving mentioned problem and to create an application implementing the solution. A method of recommending a connection is to measure different metrics e.g throughput and packet loss for Bluetooth (BT) and each channel on 2.4GHz and 5GHz Wireless Area Network (WLAN). By using an appropriate algorithm to rate the connections a result ranging from best to worst can be displayed to the user. Limitations on metrics can be inputted by the user to tailor the result to match user requirements. The application is based on Hardware Meets Software (HMS) product Anybus Wireless Bridge II. With a Telnet connection Attention-commands (AT-commands) can be used to configure and utilize the modules e.g measure signal strength. Third-party services POCO and iPerf are used to measure other metrics e.g throughput and latency. C++ and Visual Studio was used to develop the application. In accordance to the test specification the projected resulted in a successfully working application. Tests prove that with interference on a channel results in a worse rating and that other channels that are unaffected gets a higher ranking on the list. There is still room for improvement regarding exception handling when connection timeouts happen due to loss of signal.

Lo-Fi vem de Low Fidelity, que em inglês significa baixa fidelidade. Na música, se transformou em linguagem sonora a partir da década de 1970, quando alguns artistas, buscando soluções econômicas para a autoprodução e independência em relação às gravadoras, passaram a utilizar gravadores caseiros para fazer seus próprios registros. A partir desse ato de libertação e experimentação, se obteve, por transbordamento, uma sonoridade ruidosa, crua, de baixa fidelidade de gravação. Mas, ao mesmo tempo, o ruído produzido por essa produção marginal engendrou cruzamentos autênticos e espontâneos que logo formaram uma paisagem sonora de grande vitalidade. De forma contrária, o Hi-fi, ou High-Fidelity, busca na alta-fidelidade a idealização e a perfeição do seu produto final que, uma vez ligado à indústria fonográfica e à alta tecnologia, tende a ser direcionado pelas lógicas do mercado. Pensado e produzido como objeto-fim, o fazer arquitetural contemporâneo vem se aproximando da gravação hi-fi: delimitado, ordenado por estratos, classificações e tipos que a definem como objeto-produto. Nessa lógica, a arquitetura torna-se imagem, espetáculo pronto para o consumo e descarte. Propõe-se, neste trabalho, uma inflexão, um deslocamento do pensar arquitetural a partir da aproximação metafórica acionada pelo modo lo-fi . / Lo-Fi is the acronym that stands for Low Fidelity. In the music industry, during the70’s it became a trendy language when artists, searching economical solutions for self-production and independence from record companies, using homemade devices for sound recording. Following this first experiment of liberation, was obtained a noisy overflowing sonority, raw, or as it became known, low fidelity of the recording. However, at the same time the noise produced by this marginal production created an authentic and spontaneous blend that soon formed a vivid sound scene. Contrariwise the Hi-fi, or High Fidelity, seeks the idealization of perfection as its final product which, once merged to the phonographic industry and the high technology, tends to be driven by the logic of the market. Thought and produced as a final product, contemporary architecture follows the steps of the hi-fi recording: delimited, ordered in layers, classifications and by stereotypes that define it as an object-product. In this logic, architecture becomes an image, a spectacle ready for consumption and disposal. This work proposes an inflexion, a displacement on the architectural thinking from the metaphorical approach triggered by the lo-fi mode. Flaws by noise, by experimentation, by the potency of invention leads to a turning point in the making process, broader, returning to the idea of the unfinished, unexpectedly, guiding into a process that its meaning is not in the final product, but rather in the path itself, in the desire for transformation, in the unknown. Reflecting about the process as lo-fi music evokes is returning to the initial sketch, it is decomposing and questioning its nature, it is exposing the traces. It is bringing back the architecture in the sense of discovery, as a body in experimentation, as the surprise that reveals the unforeseen crossing of distinct times. The intention here is, based from speculative narratives, to try the deconstruct of some consolidated practices on the design process catalyzed by the music action. Pointing analogous approximations and representations of other architectural assemblies that are not represented by the narratives determined and exhausted by the logic of the market.