Approved for public release; distribution is unlimited / Special Forces are crucial in specific military operations. They usually operate in hostile territory where communications are difficult to establish and preserve, since the operations are often carried out in a remote environment and the communications need to be highly mobile. The delivery of information about the geographical parameters of the area can be crucial for the completion of their mission. But in that highly mobile environment, the connectivity of the established wireless networks (LANs) can be unstable and intermittently unavailable. Existing content transfer protocols are not adaptive to volatile network connectivity. If a physical connection is lost, any information or part of a file already retrieved is discarded and the same information must be retransmitted again after the reestablishment of the lost session. The intention of this Thesis is to develop a protocol in the application layer that preserves the already transmitted part of the file, and when the session is reestablished, the information server can continue sending the rest of the file to the requesting host. Further, if the same content is available from another server through a better route, the new server should be able to continue to serve the content, starting from where the session with the previous server ended. / Lieutenant, Hellenic Navy

Master of Science / Department of Computing and Information Sciences / Daniel A. Andresen / Recently, the world has been trending toward the use of Smartphone. Today, almost each and every individual is using Smartphone for various purposes benefited by the availability of large number of applications. The memory on the SD (Secure Digital) memory card is going to be a constraint for the usage of the Smartphone for the user. Memory is used for storing large amounts of data, which include various files and important document. Besides having many applications to fill the free space, we hardly have an application that manages the free memory according to the user’s choice. In order to manage the free space on the SD card, we need an application to be developed. All the important files stored on the Android device cannot be retrieved if we lose the Android device. Targeting the problem of handling the memory issues, we developed an application that can be used to provide the security to the important documents and also store unnecessary files on the distributed file servers and retrieve them back on request.

by Pan Jiao Feng. / Thesis (M.Phil.)--Chinese University of Hong Kong, 1998. / Includes bibliographical references (leaves 89-93). / Abstract also in Chinese. / Abstract --- p.i / Acknowledgments --- p.v / List of Tables --- p.x / List of Figures --- p.xi / Chapter Chapter 1. --- Introduction --- p.1 / Chapter 1.1 --- Graph definitions --- p.2 / Chapter 1.2 --- The S box graph --- p.2 / Chapter 1.3 --- The file transfer graph --- p.4 / Chapter 1.4 --- "(g, f)-factor and (g, f)-factorization" --- p.5 / Chapter 1.5 --- Thesis contributions --- p.6 / Chapter 1.6 --- Organization of the thesis --- p.7 / Chapter Chapter 2. --- On the Optimal Four-way Switch Box Routing Structures of FPGA Greedy Routing Architectures --- p.8 / Chapter 2.1 --- Introduction --- p.9 / Chapter 2.1.1 --- FPGA model and S box model --- p.9 / Chapter 2.1.2 --- FPGA routing --- p.10 / Chapter 2.1.3 --- Problem formulation --- p.10 / Chapter 2.2 --- Definitions and terminology --- p.12 / Chapter 2.2.1 --- General terminology --- p.12 / Chapter 2.2.2 --- Graph definitions --- p.15 / Chapter 2.2.3 --- The S box graph --- p.15 / Chapter 2.3 --- Properties of the S box graph and side-to-side graphs --- p.16 / Chapter 2.3.1 --- On the properties of the S box graph --- p.16 / Chapter 2.3.2 --- The properties of side-to-side graphs --- p.19 / Chapter 2.4 --- Conversion of the four-way FPGA routing problem --- p.23 / Chapter 2.4.1 --- Conversion of the S box model --- p.24 / Chapter 2.4.2 --- Conversion of the DAAA model --- p.26 / Chapter 2.4.3 --- Conversion of the DADA model --- p.27 / Chapter 2.4.4 --- Conversion of the DDDA model --- p.28 / Chapter 2.5 --- Low bounds of routing switches --- p.28 / Chapter 2.5.1 --- The lower bound of the DAAA model --- p.29 / Chapter 2.5.2 --- The lower bound of the DADA model --- p.30 / Chapter 2.5.3 --- The lower bound of the DDDA model --- p.31 / Chapter 2.6 --- Optimal structure of one-side predetermined four-way FPGA routing --- p.32 / Chapter 2.7 --- Optimal structures of two-side and three-side predetermined four-way FPGA routing --- p.45 / Chapter 2.7.1 --- Optimal structure of two-side predetermined four-way FPGA routing --- p.46 / Chapter 2.7.2 --- Optimal structure of three-side predetermined four-way FPGA routing --- p.47 / Chapter 2.8 --- Conclusion --- p.49 / Appendix --- p.50 / Chapter Chapter 3. --- "Application of (0, f)-Factorization on the Scheduling of File Transfers" --- p.53 / Chapter 3.1 --- Introduction --- p.53 / Chapter 3.1.1 --- "(0,f)-factorization" --- p.54 / Chapter 3.1.2 --- File transfer model and its graph --- p.54 / Chapter 3.1.3 --- Previous results --- p.56 / Chapter 3.1.4 --- Our results and outline of the chapter --- p.56 / Chapter 3.2 --- NP-completeness --- p.57 / Chapter 3.3 --- Some lemmas --- p.58 / Chapter 3.4 --- Bounds of file transfer graphs --- p.59 / Chapter 3.5 --- Comparison --- p.62 / Chapter 3.6 --- Conclusion --- p.68 / Chapter Chapter 4. --- "Decomposition Graphs into (g,f)-Factors" --- p.69 / Chapter 4.1 --- Introduction --- p.69 / Chapter 4.1.1 --- "(g,f)-factors and (g,f)-factorizations" --- p.69 / Chapter 4.1.2 --- Previous work --- p.70 / Chapter 4.1.3 --- Our results --- p.72 / Chapter 4.2 --- Proof of Theorem 2 --- p.73 / Chapter 4.3 --- Proof of Theorem 3 --- p.79 / Chapter 4.4 --- Proof of Theorem 4 --- p.80 / Chapter 4.5 --- Related previous results --- p.82 / Chapter 4.6 --- Conclusion --- p.84 / Chapter Chapter 5. --- Conclusion --- p.85 / Chapter 5.1 --- About graph-based approaches --- p.85 / Chapter 5.2 --- FPGA routing --- p.87 / Chapter 5.3 --- The scheduling of file transfer --- p.88 / Bibliography --- p.89 / Vita --- p.94

O principal objetivo deste trabalho é apresentar os aspectos de especificação e implementação dos serviços de transferência de arquivos desenvolvidos para duas redes locais, usadas em ambientes de automação industrial e de automação de escritório, respectivamente. São apresentados, inicialmente, alguns conceitos e os requisitos de especificação que devem ser satisfeitos por estes serviços. À luz desta caracterização, algumas especificações de serviços de transferência de arquivos para redes de computadores são estudadas e analisadas. De acordo com esta análise e com as tendências de padronização de redes de computadores usadas nas aplicações acima mencionadas, é escolhida uma especificação a ser tomada como base na implementação destes serviços. Estes serviços são especificados detalhadamente, considerando as características das redes locais utilizadas. Alguns aspectos de implementação da máquina de protocolo que presta os serviços especificados são discutidos, descrevendo-se o conjunto de processos que constituem tal máquina. Em seguida, são especificados os programas aplicativos desenvolvidos a partir destes serviços de transferência de arquivos, considerando-se os requisitos das aplicações envolvidas. Para avaliar o sistema implementado, alguns testes são definidos, visando verificar a operacionalidade, conformidade e desempenho deste sistema. Os resultados destes test6es são apresentados e discutidos. Finalmente, são feitas considerações sobre o sistema implementado e a especificação tomada como base. Como continuidade do presente trabalho, é sugerida a implementação de outros serviços utilizando a infra-estrutura criada pelo mesmo. / The main purpose of this work is to present aspects on the specification and the implementation of the file transfer services, developed for two local area networks used in manufacturing and office automation. Some concepts and the specification requirements for such services are initially presented. In the light of this introduction some specifications of file transfer services for computer networks are studied and analyzed. Based on this analysis and on the trends in computer networks standardization for the above mentioned applications, a specification is selected as the basis for the file transfer services. These services are then fully specified taking into account the characteristics of the target local area networks. Some implementation aspects of protocol machine which provides the specified services are discussed describes the processes that make up such machine. The application programs developed using these file transfer services are then described. Some tests are conceived the verify the functionalism, conformity and performance of the implemented system. The results of these tests are presented and discussed in some detail. Finally, some considerations on the implemented system and the specification used as basis are presented. As future work the implementation of other services using the framework created is suggested.

O principal objetivo deste trabalho é apresentar os aspectos de especificação e implementação dos serviços de transferência de arquivos desenvolvidos para duas redes locais, usadas em ambientes de automação industrial e de automação de escritório, respectivamente. São apresentados, inicialmente, alguns conceitos e os requisitos de especificação que devem ser satisfeitos por estes serviços. À luz desta caracterização, algumas especificações de serviços de transferência de arquivos para redes de computadores são estudadas e analisadas. De acordo com esta análise e com as tendências de padronização de redes de computadores usadas nas aplicações acima mencionadas, é escolhida uma especificação a ser tomada como base na implementação destes serviços. Estes serviços são especificados detalhadamente, considerando as características das redes locais utilizadas. Alguns aspectos de implementação da máquina de protocolo que presta os serviços especificados são discutidos, descrevendo-se o conjunto de processos que constituem tal máquina. Em seguida, são especificados os programas aplicativos desenvolvidos a partir destes serviços de transferência de arquivos, considerando-se os requisitos das aplicações envolvidas. Para avaliar o sistema implementado, alguns testes são definidos, visando verificar a operacionalidade, conformidade e desempenho deste sistema. Os resultados destes test6es são apresentados e discutidos. Finalmente, são feitas considerações sobre o sistema implementado e a especificação tomada como base. Como continuidade do presente trabalho, é sugerida a implementação de outros serviços utilizando a infra-estrutura criada pelo mesmo. / The main purpose of this work is to present aspects on the specification and the implementation of the file transfer services, developed for two local area networks used in manufacturing and office automation. Some concepts and the specification requirements for such services are initially presented. In the light of this introduction some specifications of file transfer services for computer networks are studied and analyzed. Based on this analysis and on the trends in computer networks standardization for the above mentioned applications, a specification is selected as the basis for the file transfer services. These services are then fully specified taking into account the characteristics of the target local area networks. Some implementation aspects of protocol machine which provides the specified services are discussed describes the processes that make up such machine. The application programs developed using these file transfer services are then described. Some tests are conceived the verify the functionalism, conformity and performance of the implemented system. The results of these tests are presented and discussed in some detail. Finally, some considerations on the implemented system and the specification used as basis are presented. As future work the implementation of other services using the framework created is suggested.

Cloud computing is pervasive in our daily life. For instance, I usually use Google¡¦s GMail to receive e-mail, Google Document to edit documents online and Google Calendar to make my daily schedule. We can say that Google provides a ¡§Platform as a Service (PaaS)¡¨, which delivers a computing platform as a service, and the platform sustaining lots of cloud applications such as I mentioned above. However, the cloud computing platform of Google is private: we cannot trace its source code and make cloud applications on it! Fortunately, there¡¦s an open source project supported by Apache named ¡§Hadoop¡¨, which has a distributed file system which is very like Google File System (GFS) called ¡§Hadoop distributed file system (HDFS)¡¨. In order to observe the properties of HDFS, we design and implement a HDFS-based FTP server system called FTP-ON-HDFS system, say, a FTP server whose storage is HDFS. There are a web-console for FTP administrator, a FreeRADIUS server and a MySQL database for user authentication, a NameNode daemon on its machine, a SecondaryNameNode on its machine and five DataNode daemons and on five different machines in FTP-ON-HDFS system. Our FTP-ON-HDFS system can tune two QoS parameters: ¡§data block size¡¨ and ¡§data replication¡¨. Then, we tuned ¡§data block size¡¨ and ¡§data replication¡¨ in our system and compared its performance with Hadoop File System (FS) shell command and normal vsftpd. On the other hand, FUSE can mount HDFS from remote cluster to local machine, and make use of the permission of the local machine to manage HDFS. So, we compared the performance of FUSE with HDFS (FUSE-DFS) and our FTP-ON-HDFS system.

Dissertation (Ph.D.) -- Worcester Polytechnic Institute. / Keywords: streaming media; streaming transport protocol; active queue management (AQM); Internet congestion control. Includes bibliographical references (p. 236-248).

Thesis (M.S. in Computer Science)--Naval Postgraduate School, March 2005. / Thesis Advisor(s): Su Wen, Arijit Das. Includes bibliographical references (p. 149 p.). Also available online.

Submitted by Kamila Costa (kamilavasconceloscosta@gmail.com) on 2015-07-23T19:11:45Z No. of bitstreams: 2 Dissertação - Luis A P Batista.pdf: 26709847 bytes, checksum: 825021f874056d390e50bc5fa98b137a (MD5) Capa.pdf: 223609 bytes, checksum: 8831f2d4b1dd1604ea6ed1e33e2a0bf6 (MD5) / Approved for entry into archive by Divisão de Documentação/BC Biblioteca Central (ddbc@ufam.edu.br) on 2015-07-27T15:09:52Z (GMT) No. of bitstreams: 2 Dissertação - Luis A P Batista.pdf: 26709847 bytes, checksum: 825021f874056d390e50bc5fa98b137a (MD5) Capa.pdf: 223609 bytes, checksum: 8831f2d4b1dd1604ea6ed1e33e2a0bf6 (MD5) / Approved for entry into archive by Divisão de Documentação/BC Biblioteca Central (ddbc@ufam.edu.br) on 2015-07-27T15:17:55Z (GMT) No. of bitstreams: 2 Dissertação - Luis A P Batista.pdf: 26709847 bytes, checksum: 825021f874056d390e50bc5fa98b137a (MD5) Capa.pdf: 223609 bytes, checksum: 8831f2d4b1dd1604ea6ed1e33e2a0bf6 (MD5) / Made available in DSpace on 2015-07-27T15:17:55Z (GMT). No. of bitstreams: 2 Dissertação - Luis A P Batista.pdf: 26709847 bytes, checksum: 825021f874056d390e50bc5fa98b137a (MD5) Capa.pdf: 223609 bytes, checksum: 8831f2d4b1dd1604ea6ed1e33e2a0bf6 (MD5) Previous issue date: 2010-06-01 / Não Informada / This thesis is intended to look into the FTP (File Transfer Protocol) system on the News Broadcasting production from stations belonging to Rede Amazônica (TV Amazonas, TV Rondônia, TV Acre, TV Roraima and TV Amapá), at the Central de Jornalismo (journalism Center) located in the capital of the State of Amazonas and its effects on the routine of the community from the municipality of Manacapuru, which has become not only consumer of information, but also its protector. As a theoretical reference underlying Castells’ (1999, 2001, 2003) approaches, with the theory of network society through access to information; Dizard (2000) with the theory of old and new medias, analyzed on a time-space scale, in the context of the Amazon Region; and Milanesi (1978) with a reflection regarding the impact influence of old and new medias on peripheral areas, in regards to the existence of a central area. The research, an exploratory-descriptive case study, comprises communication as a result of a historical process which, in order to meet the society’s constantly changing demands, produces at the same time, through science, new technologies. The applied investigative techniques consist of document research with quantitative and qualitative data collection survey, by using resources such as questionnaires, semistructured interviews, semi-structured and participative observation. Unpublished and standardized data collected in this study aimed at contributing to the successful scientific knowledge production regarding the Amazon reality, as there is an expectation the results may be used as reference to other areas and investigations. / Esta dissertação investiga o efeito do sistema FTP (File Transfer Protocol ou Protocolo de Transferência de Arquivo) no processo de produção do telejornalismo das emissoras da Rede Amazônica (TV Amazonas, TV Rondônia, TV Acre, TV Roraima e TV Amapá), a partir da Central de Jornalismo sediada na capital do estado no Amazonas e seus efeitos no cotidiano da comunidade do município de Manacapuru, que passou a ser não apenas consumidora de informação, mas também produtora dela. Como referencial teórico embasa a reflexão nas abordagens de Castells (1999, 2001, 2003) com a teoria da sociedade em rede por meio do acesso à informação; Dizard (2000) com a teoria das velhas e novas mídias, analisadas, em uma escala tempo-espaço, ao contexto da região amazônica; e Milanesi (1978) com a reflexão acerca da influência do impacto das velhas e novas mídias em áreas periféricas, em relação à existência de uma área central. A pesquisa, um estudo de caso de caráter exploratório-descritivo, compreende a comunicação como resultado de um processo histórico que para atender as demandas da sociedade em constante transformação, produz em paralelo, por meio da ciência, novas tecnologias. As técnicas de investigação empregadas consistem em pesquisa documental com levantamento de dados quantitativos e qualitativos, pautadas no recurso de questionários, entrevistas semi-estruturadas, observação semi-estruturada e participante. Os dados inéditos levantados e sistematizados neste estudo tiveram por objetivo contribuir com o processo de produção do conhecimento científico acerca da realidade amazônica, na expectativa dos resultados virem a servir como referência para outras áreas e investigações.

Please read the abstract in the section 00front of this document / Dissertation (MSc (Computer Science))--University of Pretoria, 2006. / Computer Science / unrestricted