The wide-spread adoption of camera-embedded mobile devices along with the ubiquitous connection via WiFi or cellular networks enables people to visually report live events. Current solutions limit the configurability of such services by allowing video streaming only to fixed servers. In addition, the business models of the companies that provide such (free) services insert visual ads in the streamed videos, leading to unnecessary resource consumption. This thesis proposes an architecture of a real-time video streaming service from an Android mobile device to a server of the user's choice. The real-time video can then be viewed from a web browser. The project builds on open-source code and open protocols to implement a set of software components that successfully stream live video. Experimental evaluations show practical resource consumption and a good quality of the streamed video. Furthermore, the architecture is scalable and can support large number of simultaneous streams with additional increase in hardware resources.

In the thesis the advantages with Text over IP (ToIP) is explained and it is motivated why it is a good idea to integrate this in Asterisk. It also presents an implementation of a ToIP extension in Asterisk. ToIP means communicating over a network based on Internet protocols with real-time text. Real-time text means a character is sent to the receiving terminal as soon the sender has typed it or with a small delay. In the thesis IM and ToIP is compared in a survey. The result point at IM is not better than ToIP even though it is much more commonly used. VoIP can not replace ToIP either because there are occasions when ToIP is better for instance if the person using it is deaf or if a person want to make a private conversation in a noisy room. Asterisk is an IP-PBX. PBX stands for Private Branch Exchange which means a private telephone system which is part of a larger network system that exchange information. An IP-PBX is a PBX based on the Internet. Asterisk and many other IP-PBX can also exchange calls between the PSTN ant the Internet. By including ToIP in Asterisk it will be possible to exchange ToIP calls. The implementation described is not only including ToIP in Asterisk but also a translation function between the text format called t140 and another text format called t140 with redundancy. The idea is to extend the translation function in the future to more text formats.

Orientador: Jose Alexandre Diniz / Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Eletrica e Computação / Made available in DSpace on 2018-08-12T04:29:31Z (GMT). No. of bitstreams: 1 Barros_AngelicaDenardide_M.pdf: 3382435 bytes, checksum: 06e6858052deff3336f5e44a60b55e08 (MD5) Previous issue date: 2008 / Resumo: O presente trabalho tem como objetivo a caracterização de filmes finos de óxido de titânio para aplicação em transistores de efeito de campo sensíveis a íons, do inglês ion sensitive field effect transistors (ISFETs). Para isso, filmes finos de titânio de diferentes espessuras foram depositados através de uma evaporadora por feixe de elétrons sobre substrato de silício. Posteriormente, estes filmes foram oxidados e recozidos utilizando diferentes temperaturas através de um forno de processamento térmico rápido, do inglês rapid thermal process (RTP). Os filmes de óxido de titânio (TiOx) foram então caracterizados de forma estrutural através das técnicas Elipsometria, Espectroscopia Infravermelho, Espectroscopia RAMAN, Microscopia de Força Atômica e Espectroscopia de Retroespalhamento Rutheford. Dependendo da temperatura do patamar de tratamento térmico, foram obtidos filmes com diferentes concentrações de oxigênio, o que influenciou na espessura final, no índice de refração, na rugosidade da superfície e nos contornos de grão da superfície dos filmes. Através da caracterização estrutural foi possível verificar a formação de filmes de TiOx compostos principalmente da estrutura cristalina rutilo do TiO2, mas que também apresentaram a estrutura cristalina anatase, além da formação de uma fina camada de Ti2O3 e SiO2 entre o substrato de silício e o filme de TiOx. A caracterização elétrica realizada através da análise das curvas I-V e C-V, obtidas a partir de capacitores confeccionados através da deposição de eletrodos de aluminio (Al/Si/TiOx/Al), demostraram a obtenção de dielétricos de boa qualidade com valores de constante dielétrica entre 12 e 33, densidade de carga na interface da ordem de 1010/cm2 e densidade de corrente de fuga entre 1 e 10-4 A/cm2. Transistores de efeito de campo foram confeccionados para a obtenção de curvas IDxVDS e log IDxTensão. Foi encontrado valor de tensão de Early igual a -1629V, resistência de saída, ROUT, igual a 215MO e slope de 100mV/dec para o dielétrico de TiOx obtido com tratamento térmico em 960°C. O filme de TiOx tratado térmicamente em 600°C foi testado como sensor através de medidas C-V adaptadas e apresentou deslocamento da VFB em função da variação do pH da solução testada, apresentando potencial como sensor de pH. / Abstract: This work presents the characterization of thin titanium oxide films as potential dielectric to be applied in ion sensitive field effect transistors. The films were obtained through rapid thermal oxidation and annealing of titanium thin films of different thicknesses deposited by Ebeam evaporation on silicon wafers. These films were analyzed by Ellipsometry, Infrared Spectroscopy, Raman Spectroscopy, Atomic Force Microscopy and Rutherford Backscattering Spectroscopy. The final thicknesses of the thin films, roughness, surface grain countors, refractive indexes and oxigen concentration depend on the oxidation and annealing temperature. Structural characterization showed the presence of other oxides such Ti2O3, an interfacial SiO2 layer between the dielectric and the substrate and the anatase crystalline phase of TiO2 films besides the mainly found crystalline phase rutile. Electrical characterizations were obtained through I-V and C-V curves of Al/Si/TiOx/Al capacitors. These curves showed that the films had high dielectric constants between 12 and 33, interface charge density about 1010/cm2 and leakage current density about 1 and 10-4 A/cm2. Field effect transistors were made in order to analyze IDxVDS and log IDxBias curves. Early tension value of -1629V, ROUT value of 215MO and slope of 100mV/dec were calculated for the TiOx thin film thermally treated with 960°C. The TiOx thin film thermally treated with 600°C was successfully tested as pH sensor through adapted C-V measurements, which showed shifts in the VFB according to the H+ concentration in tested solutions. / Mestrado / Eletrônica, Microeletrônica e Optoeletrônica / Mestre em Engenharia Elétrica

This report presents an investigation of the possibilities to implement voice over IP (VoIP) in Sony Ericsson cellular phones. The results from this investigation show that it is partially possible to implement such a solution. The best option for doing so is to make use of the support for the Session Initiation Protocol and the Real-time Transport Protocol offered by the architecture. Another goal is to evaluate if Bluetooth is able to handle the requirements needed for the solution. The whole concept is proven by implementing a prototype. Measurements on this prototype show that Bluetooth will be able to handle the requirements of most IP-based voice communication, i.e., in respect to latency and bandwidth.

Under lång tid har det diskuterats om staten är slösaktig och ineffektiv med skattepengar och om olika politiska beslut är bra för folket eller ej. Under 2007 lagstadgades det att varje region måste ha en policysatsning, där det ska ske satsningar inom många områden. Får att få en djupare förståelse för detta så undersöker denna studie vilka effekter, om några, de olika regionala satsningarna har på det Värmländska näringslivet. I den här uppsatsen gjordes det en fallstudie på Hållbar Värmländskt växtkraft som var en generell policysatsning i Värmland mellan 2004 och 2007 och det undersöktes om den hade någon positiv effekt på Värmland. Med hjälp av de verktyg som används i denna uppsats gick det inte att observera några positiva effekter på regionen. Dock innebär en undersökning av denna typ ett antal problem, framförallt att göra en kvalificerad uppskattning av hur Värmlands ekonomi skulle ha sett ut utan satsningen. För att undersöka effekten av policysatningen samlades sekundärdata in och jämfördes med de ekonomiska målen i Hållbar Värmländskt växtkraft. Det gjordes även jämförelse med liknande regioner för att se om Värmland gick bättre efter 2004 när satsningen genomfördes. Vi finner att Värmland utvecklas ungefär som andra regioner som är i ett liknande läge. En annan metod som kallas syntetiska kontrollmetoden används vid jämförelse med andra regioner. Metoden användes för att se om det går att se om Värmland visar på en bättre tillväxt än andra, jämförbara regioner åren efter satsningen, men resultatet från metoden visar att Värmland, i många fall, går sämre åren efter även fast satsningen genomfördes. Många satsningar i Värmland fokuserar på klusterinitiativ och klusterorganisationer. Det är ett verktyg för att skapa tillväxt och innovation i området. Satsningar i Värmland är framarbetade enligt triple-helix, en modell som beskriver hur tre viktiga pelare i en region samarbetar för att öka tillväxt och innovation. I Värmland är pelarna länsstyrelsen/region Värmland, universitetet och näringslivet. Trots det stora fokus i satsningarna; skapar kluster någon tillväxt i Värmland? Resultatet i uppsatsen är positiva och visar att det faktiskt finns viss signifikant effekt av kluster. Några rapporter som diskuteras i uppsatsen tyder på att kluster leder till tillväxt och att deltagande företag rapporterar förbättringar inom till exempel försäljning, kostnadsfördelar, humankapital och investeringar. Samtidigt går det dock att se ett tydligt glapp mellan vad företag förväntar sig av kluster och den verkliga effekten av medlemskap i klusterorganisationer. I den statistiska undersökningen av kluster som genomförs i denna studie visar resultatet på ett positivt och huvudsakligen signifikant samband mellan närvaron av kluster och ett antal olika ekonomiska mått som BRP och lönesummor. Dock visar resultaten på en positiv men icke-signifikant effekt på företagsvinster.

This master’s thesis delves into the possibilities of the open-source Private Branch Exchange Asterisk, elaborates on its features and compares it with several other distros. The term SIP stack is explained here with the mention of two of its representatives. Further in the thesis, the security risks of the VoIP technology are explained, and specific attacks are described and then realized. As a part of the testing process, the possibilities of a custom module and its following implementation are explored, as well as the portability between the individual distros and its proper functioning.

The topic of the master's thesis is about transmission of multimedia via network with help of compression’s algorithm used in codec MPEG-4 part 10 and Real Time Protocol (RTP). First part of this master thesis will be familiarization with basic terms about multimedia. It will be queried about techniques of compression axioms for audio and video, justification for necessary use of compression in transmitting multimedia via network. Also, here will be subscribed principles and properties of Real Time Protocol, which was designed for multimedia stream. From the start, competent codec for implementation of two applications (client, server) with read raw video and audio data, will choose the following : compression with help of codec Theora (Vorbis), transfer via network in RTP packets, decode and play at visual form for end user. Complete subscription of implementation for both applications written in programming languages C/C++ and Java, will be certain. The basic overview about this problematic experience with implementation, which were here concluded, are the reasons for reading this master thesis.

Thesis deals with multicast broadcasts, discusses the type of ASM and SSM. Also deals with the principle of RTP / RTCP protocol for large multicast groups, for example, broadcasting IPTV. It was created a model for simulating the behavior of the network load in a large number of receivers. The application was developed in Java and uses the recommendations of RFC3550. There are also analysed processes of communication, initialization, log out, the structure of the data packets and signaling packets. The system is designed that can simulate multicast network and obtain the estimated parameters of the operation, or can operate in real traffic, for example, as a third-party monitor. In both modes, the measurement was carried out model situations. The results of the measurements were then compared. Principle and system control was described in detail. Output measurements are graphically processed and included in the work.

The master’s thesis deals with creation of system that provides video on demand. Technologies which are used to creation mobile application are analyzed. There are also mentioned today's most used codecs in the mobile devices. There are described standards, norms, principles and recommendations for transfer multimedia data on network in real time. Technologies which are appropriate for functionality of system on server side are described. The output of the work is an operational sample of whole system and description of functionality of this system.

A signalization in an Internet protocol environment is commonly used for monitoring quality of service and other parameters of a network. This thesis is involved in transmission of signalization through internet protocol networks and proposes scalable solution for small and even for large-scale internet television broadcasting. The main contribution of this thesis lies in design and validation of optimal hierarchical tree on the basis of resources assigned. This is done in respect to geographical distance, network distance of each particular member of the hierarchical structure. For the design of algorithms simulations and global experimental network were used.