A compreensão das dificuldades que envolvem o comportamento do sistema elétrico de potência tem sido cada vez mais importante e a estimação de estado do sistema é de fundamental importância para a sua operação adequada. Entretanto, torna-se necessário saber se o sistema é observável ou não. Este trabalho, tem como objetivo desenvolver um software que possibilite a visualização gráfica da rede de energia como um todo, ou das sub-redes observáveis do sistema. Como instrumento teórico foram utilizadas teorias e algoritmos desenvolvidos para a análise de observabilidade de redes do sistema de energia elétrica que utilizam a fatoração triangular da matriz ganho bem como o método de vetores esparsos. O algoritmo desenvolvido por [2] foi implementado em ambiente gráfico do Windows, buscando a visualização gráfica do resultado numérico, exibido-a na tela do computador. Por ser essencialmente lógico, este algoritmo foi escolhido para a implementação. Como ferramenta, foi utilizado o compilador Borland C++ for Windows versão 4.0. Os resultados dos testes realizados em redes de 6, 14 e 30 barramentos apontam para: 1) a simplificação da análise de observabilidade, utilizando vetores esparsos e fatoração triangular da matriz ganho; 2) a similiaridade de comportamento dos três sistemas testados, com fortes indícios de que a rotina desenvolvida funciona satisfatoriamente para qualquer sistema, principalmente para os sistemas de maiores quantidades de barramentos e de linhas; 3) a possibilidade de implementação de qualquer resultado numérico, em ambiente gráfico, aproveitando o programa aqui desenvolvido. / In the Operating Center of Electrical Energy system has been every time more and more important the understanding of the difficulties related to the electrical power behavior. In order to have adequate operations of the system the state estimation process is very important. However before performing the system state estimation owe needs to know if the system is observable otherwise the estimation will not be possible. This work has as main objective to develop a software that allows one to visualiza the whole network in case that networks observable or the observable island of the entire network. As theoretical background the theories and algorithm using the triangular factorization of gain matrix as well as the concepts contained on factorization path developed by [2] were used. The algorithm developed by [2] was adapted to the Windows graphical form so that the numerical results of the network observability are shown in the computar screen in graphical form. This algorithm is essentially intead of numerical as the one based on the factorization of gain matrix only [1]. To implement the algorithim previously referred it was used the Borland C++ compilar for windows version 4.0 due to the facilities for sources generation it presents. The results of the tests in the network with 6, 14 and 30 bus leads to: 1) the simplification of observability analysis, using sparse vectors and triangular factorization of the gain matrix; 2) the behavior similarity of the three tested systems with effective clues that the routine developed works well for any systems mainly for systems with bigger quantities of bus and lines; 3) the alternative way of presenting numerical resutts using the program developed here in graphical forms.

Orientador: Lucila Chebel Labaki / Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Civil, Arquitetura e Urbanismo / Made available in DSpace on 2018-08-17T05:33:32Z (GMT). No. of bitstreams: 1 Nogueira_FlaviaElaineAliottiRodrigues_M.pdf: 13154436 bytes, checksum: 9d9e5baa32a2d76ff8018f6dfa3645db (MD5) Previous issue date: 2007 / Resumo: Na dissertação aqui apresentada a ênfase está no uso consciente da luz natural enquanto elemento valorizador da qualidade dos edifícios. O ambiente escolar tem necessidades específicas de conforto ambiental, sendo as aberturas elementos de projeto essenciais para o bom desempenho térmico, luminoso e energético das escolas. O trabalho tem por objetivo apresentar o estudo do desempenho luminoso das tipologias de aberturas das salas de aula, adotadas nas escolas municipais de Campinas, SP. A aquisição de dados mensuráveis de parâmetros de Iluminação Natural se fez através do estudo de caso de duas escolas municipais, obtendo-se um levantamento de real valor no processo de projeto das reformas a serem realizadas pelo departamento de projeto de escolas da prefeitura Municipal de Campinas. A metodologia consistiu de visita às escolas, entrevistas, análise prévia através de plantas e fotos. Medidas de iluminância em pontos e horários pré-estabelecidos foram realizadas, e seus resultados analisados de acordo com as normas brasileiras. Os parâmetros de uniformidade e diversidade de iluminação natural foram analisados de acordo com a adequação das aberturas à orientação. Os resultados permitiram analisar com profundidade o tema-objeto dessa proposta, com vistas à sua utilização na prática do projeto de edificações escolares, visando à melhoria do conforto visual / Abstract: In this work the emphasis is in the conscious daylighting use in buildings, while valuable quality element. The school environment has particular necessities of environmental comfort, the openings being design elements essential for good thermal, luminous and energetic performance of the schools. The objective of this work is to study luminous performance of the opening classroom typologies most often adopted in municipal schools in the city of Campinas, SP. The measurable data acquisition for daylighting analysis was performed through case study of two schools. The results allowed to obtaining a withdrawal with actual value in the design process of the reforms to be accomplished by the schools design department of the City Government of Campinas. The methodology consisted of visits, interviewees, previous analysis through plants and photos. Measurements of illuminance in pre-established points and schedules were accomplished, and the results were analyzed according to Brazilian standards. Natural lighting uniformity and diversity were analyzed by verifying the adequacy of the openings to solar orientation. Results allowed analyzing with depth the proposed theme, regarding its application in the design practice of school buildings, regarding the improvement of visual comfort / Mestrado / Edificações / Mestre em Engenharia Civil

Orientador: Celio Cardoso Guimarães / Dissertação (mestrado) - Universidade Estadual de Campinas, Instituto de Computação / Made available in DSpace on 2018-07-28T09:21:12Z (GMT). No. of bitstreams: 1 Granado_MarcusCunha_M.pdf: 24944658 bytes, checksum: 511feafcfab73a86a468d2a4d08d1245 (MD5) Previous issue date: 2001 / Resumo: Esta dissertação de mestrado visa analisar a segurança dos protocolos de comunicação do sistema operacional Windows NT da Microsoft, especialmente quando usados em ambientes corporativos, onde é importante determinar se informações sigilosas estão adequadamente protegidas. Várias falhas importantes, de difícil correção, encontradas dispersas na bibliografia, foram apontadas e agrupadas. Novas e importantes vulnerabilidades foram descobertas, mostrando que mesmo o Windows 2000, a última versão deste sistema operacional, está sujeita a ataques eficientes que permitem sobrepujar esses protocolos de comunicação para obter informações sigilosas. / Abstract: This master thesis aims to assess Microsoft Windows NT operating system communication protocols security, mainly when used in corporation environments, where it is important to ascertain if sensitive information is adequately secured. Several important security faults, which are difficult to correct and are dispersed in bibliography, were pointed and grouped. Important new vulnerabilities were discovered, showing that even Windows 2000, the last version of this operating system, is subject to efficient attacks that allow supplanting those communication protocols in order to obtain sensitive information. / Mestrado / Mestre em Ciência da Computação

IPv6 Privacy extensions, implemented in major operating systems, hide user’s identity by using a temporary and a randomly generated IPv6 addresses rather than using the former, EUI-64 format where the MAC address is part of the IPv6 address. This solution for privacy has created a problem for network administrators to back-trace an IPv6 address to a specific MAC address, since the temporary IP address used once by the node is removed from the interface after a period of time. An IPv6 Ethernet test bed is setup to investigate IPv6 implementation dynamics in Windows 7 and Ubuntu10.04 operating systems. The testbed is extended to investigate the effects of temporary IPv6 addresses due to IPv6 privacy extensions on the on-going sessions of different applications including ping, File Transfer Protocol (FTP) and video streaming (HTTP and RTP). On the basis of the knowledge obtained from investigations about dynamics of IPv6 privacy extensions, this work proposes Internet Protocol version 6 Host Tracking (IPv6HoT), a web based IPv6 to MAC mapping solution. IPv6HoT uses Simple Network Management Protocol (SNMP) to forward IPv6 Neighbor table from routers to Network Management Stations (NMS). This thesis work provides guidelines for configuring IPv6 privacy extensions in Ubuntu10.04 and Windows 7; the difference of implementation between these two operating systems is also presented in this work. The results show that temporary IPv6 addressing has a definite effect on the on-going sessions of video streaming and FTP applications. Applications running as server on Temporary IPv6 address encountered more frequent on-going session interruptions than applications running as a server over public IPv6 address. When temporary IPv6 addresses were configured to host FTP and video streaming applications, their on-going sessions were permanently interrupted. It is also observed that LFTP, a client FTP application, resumes an interrupted session. / theodrosmek11@gmail.com, iamvivek86@gmail.com

Användare kan idag boka taxi via TaxiCaller på webben, iPhone och Android. De vill även finnas på Windows Phone 8 och därmed stödja de tre största smartphoneplattformarna. Den här rapporten syftar till att undersöka hur en applikation kan utvecklas med hjälp av ett användarcentrerat arbetssätt för att uppnå hög användbarhet. Prototyping, card sort, användbarhetskrav är några av de metoder som tillämpats. Rapporten beskriver metoderna genom dess teori, hur de tillämpats i projektet samt dess resultat. Det grundläggande genomförandet var att samla in användarinformation för att sedan utveckla en prototyp som testades på användare. Sedan gjordes en ny prototyp utifrån resultatet från användartestet och denna process itererade fram fyra prototyper. Användbarhetsproblem från testerna samt tid för genomförande av specificerad uppgift redogörs. Resultatet är en prototyp för Windows Phone 8 som nästintill är helt färdig för publicering. Användartest är den metod som haft mest påverkan på resultatet av applikationen. Varje test har frambringat problem med användbarheten som sedan har kunnat åtgärdas för att förbättra applikationen. Med tanke på utvärderingar och de krav som specificerades är jag nöjd med resultatet som bland annat är avskalat och grafiskt tilltalande samtidigt som den önskade funktionaliteten från TaxiCaller är implementerad.

Sammanfattning Den här uppsatsen beskriver arbetet bakom migreringen av en .NET webapplikation skriven i C#, kallad AMM, till en molnapplikation som sedan lagts upp på Windows Azure datormoln. Arbetet är gjort på uppdrag av Sogeti Karlstad som är ett konsultföretag för IT-relaterade lösningar. Målet bakom migreringen var att utreda om Windows Azures molntjänst lämpade sig till att användas för mindre applikationer såsom denna. Själva uppgiften var att få applikationen att fungera i Windows Azures datormoln samt att förbättra befintliga funktioner inom applikationen. Resultatet blev en applikation som drivs helt och hållet av Microsoft Windows Azure, och den har funktionen att kunna skapa nya databaser beroende spå hur många kunder som använder sig av tjänsten.

In this study, the cloud platform Windows Azure has been targeted for test implementations of Geographical Information System (GIS) software in the form of map servers and tile caches. The map servers included were GeoServer, MapNik, MapServer and SharpMap, which together with the tile caches, GeoWebCache, MapCache and TileCache, were installed on Windows Azures three different virtual machine roles (Web, Worker and VM). Furthermore, different techniques for scalingapplications and internal role communication are presented, followed by four sets of performance tests. The performance tests attempt to highlight the differences in request times, how the different role sizes handle the load from the incoming requests, how the different role sizes handle many concurrent TCP-connections and how well the incoming requests are load balanced in between the worker roles. The test implementations showed that all map servers and tile caches were successfully installed in Azure, which leads to the conclusion that Windows Azure is suitable for hosting GIS software with similar installation requirements to the previously mentioned software. Four different approaches (Direct mapping, Public Internal Endpoints, Queue and Worker Role Request Broker) are presented showing how Azure allows different methods in order to scale the internal role communication as well as the external client requests. The performance tests provided somewhat inconclusive test results due to hardware limitations in the test setup. This made it difficult to draw concluding parallels between the final results and the expected values. Minor tendencies in performance gain can be seen when scaling the VM size as well as the number of VMs.

System för säkerhetskopiering och återställning är ett ämne som de flesta IT-verksamheter idag arbetar med. Tekniken förändras och datan växer med tiden vilket gör att en fungerande lösning för säkerhetskopiering och återställning blir allt viktigare i takt med vårt växande IT-samhälle. Vad man väljer för system beror även på vilka krav en organisation ställer och storleken på organisationen. Mindre företag behöver inte lika komplexa system som till exempel en datacenter-miljö. Detta betyder att det inte riktigt finns en generell lösning för alla. Man behöver alltså tänka igenom och skräddarsy lösningar för att möta de specifika krav organisationen ställer. Denna studie innehåller tre olika huvudavsnitt. Först teorin bakom säkerhetskopiering och återställning. Här återfinns bland annat olika begrepp, tekniker och programvaror. Sedan utfördes intervjuer med tre olika IT-verksamheter samt laborationer av olika programvarulösningar. Här besvaras den största delen av de frågeställningar som tas upp i studien. I det sista skedet återfinns en slutsats för studien. Studien behandlade främst säkerhetskopiering och återställning i mindre skala. Teorin bakom är dock applicerbar på alla organisationsstorlekar.

Det finns flera olika sätt att säkerhetskopior, några vanliga sätt är lokal säkerhetskopiering, fjärrbaserad säkerhetskopiering och säkerhetskopiering som lagras på en molnplattform. Då det finns många leverantörer som erbjuder molnbaserade lösningar som gör det möjligt för en användare att lagra filer på respektive plattform kommer enbart molntjänsterna, ”Mega” och ”Dropbox for Business” att användas. För att besvara delfråga 1 utförs en litteraturstudie med tillhörande analys, för att besvara delfråga 2 och 3 kommer flertalet kvasiexperiment att utföras i en labbmiljö. Dropbox har en speciell avdelning som sysslar enbart med säkerhetsrelaterade frågor som förespråkar att AES med 256 bitars kryptering bör användas. Mega menar att 128 bitars AES kryptering räcker för att kryptera data då hårdvarubelastningen blir onödigt hög om starkare kryptering används.

The diploma thesis deals with the specific collaborative tools used in given company. It aims to validate the hypotheses selected within the surveyed company. The thesis is divided into two parts. The first part contains theoretical bases of the thesis. It outlines issues of information technology and communication tools since their beginnings towards the latest trends. The focus is on enterprise Microsoft and its products Microsoft Lync, Microsoft SharePoint and Windows Phone and enterprise BlackBerry and its contribution to the development and use of mobile communication devices. The practical part contains characteristics of surveyed company, the process of creating the survey, methodology, analysis and evaluation of given hypotheses.