<p>This thesis presents research that created an application protocol for wireless networks and functional brain spectroscopy. The proposed protocol was tested through the integration of several types of networks, devices, and sensors to facilitate functional brain spectroscopy. The need for reliability and speed to transmit medical data in near real time can make medical application uniquely challenging. This research addresses one of the main challenges faced when building medical solutions that monitor the human brain. The findings proposed a protocol that was implemented using an architectural model for a solution that provides full mobility in an everyday environment using a near-infrared light sensor designed to monitor brain function in humans. Moreover the study showed it is possible to use heterogenic networks and heterogenic devices to provide useful data that can be used for medical purposes [103]. A system implemented the proposed protocol was built to allow the possibility of testing subjects to be monitored in their real environment [104]. To test this hypothesis, heterogenic communication software was developed to allow for the collection of physiological data from a mobile near-infrared sensor via a mobile telephone that had Bluetooth support and Global Standard for Mobile Communications (GSM) support. The result of this work introduced Medical Data Transfer Protocols (MDTP) [106], an algorithm [103], and an architectural model (Four-node Model) [105].</p> / Doctor of Philosophy (PhD)

M.Comm. / This study was conducted with the intent of understanding and evaluating the commercial use and possibilities that the Internet offers, as well as the strategic approach businesses should take when commencing with electronic commerce on the Internet. The potential value of Intranets and Extranets has also been examined briefly. The Internet is a very useful mechanism for marketing as well as sales of products or services on a domestic or international basis. Various other commercial possibilities and uses exist for the Internet, as well as for its derivatives — the Intranet and Extranet. In the fiercely competitive market of today, companies research, develop and invest resources in various methods and tools in the hope to gain competitive advantage over their rivals. The Internet, Intranet and Extranet, used in isolation or conjunction, pose an extremely attractive alternative to gaining competitive advantage in a specific sector or market niche.The success of the Internet as a business tool depends directly on the overall business strategy that is driving the approach. For optimum success the main business strategy must be aligned with the Information Technology Strategy, and especially include thorough consideration as well as planning when implementing the Internet or one of its derivatives as a business tool.

Dissertation (Ph.D.)--Auburn University, 2007. / Abstract. Vita. Includes bibliographic references (p.175-183).

Submitted by Fabio Sobreira Campos da Costa (fabio.sobreira@ufpe.br) on 2017-03-02T13:44:12Z No. of bitstreams: 2 license_rdf: 1232 bytes, checksum: 66e71c371cc565284e70f40736c94386 (MD5) Dissert_Alexandre_Santos_CIN.pdf: 2195136 bytes, checksum: bc5b11111393e727688fe5580cf6f0b4 (MD5) / Made available in DSpace on 2017-03-02T13:44:12Z (GMT). No. of bitstreams: 2 license_rdf: 1232 bytes, checksum: 66e71c371cc565284e70f40736c94386 (MD5) Dissert_Alexandre_Santos_CIN.pdf: 2195136 bytes, checksum: bc5b11111393e727688fe5580cf6f0b4 (MD5) Previous issue date: 2016-07-28 / Com o crescimento da adoção de comunicação de voz em redes de dados, tecnologia conhecida como Voice Over Internet Protocol (VoIP) , tornaram-se evidentes, tanto vantagens obtidas, quanto problemáticas decorrentes do contraste entre a natureza das redes de dados e as necessidades do tráfego VoIP. A internet não possui, por padrão, formas inteligentes de proteção e priorização do tráfego, levando à utilização de tecnologias externas para suprir estas necessidades. Todavia, a utilização destas tecnologias tem tornado-se cada vez mais complexa em virtude de um fenômeno conhecido como ossificação das redes IP, conforme Mckeown et al. (2008). Em busca de solucionar os problemas enfrentados pelas redes atuais e prover maior flexibilidade e capacidades inovadores, surge a Software Defined Network (SDN), tecnologia que visa trazer uma série de vantagens para as redes de dados atuais através de sua arquitetura. Neste trabalho é proposta a VoIPath, uma solução baseada em SDN que implementa uma técnica de seleção de caminhos com base em atributos específicos, relevantes para o tráfego VoIP. Para processar estes atributos e identificar os melhores caminhos para o tráfego VoIP é empregado um algoritmo criado com programação linear, onde um volume de tráfego VoIP é dividido entre diferentes caminhos, com base em opções de execução da solução. Para controlar a propagação do tráfego é empregada uma tecnologia baseada em SDN a Virtual Tenant Networks (VTN), através desta o tráfego é conduzido por uma rede lógica, chamada de tenant. O mapeamento destas redes lógicas na rede SDN física garante a passagem do tráfego pelos caminhos selecionados. Por fim é realizada uma série de experimentos para demonstrar a efetividade da solução, bem como melhorias na qualidade do áudio, calculadas com base em um modelo de avaliação de qualidade de tráfego VoIP. / With increasing adoption of voice communications through data networks, technology known as VoIP, both advantages and issues have become apparent. The second group caused by the contrast between the nature of data networks and the needs of VoIP traffic. By default, data networks do not have smart structures to protect and prioritize traffic. In order to achieve these characteristics external technologies are deployed, but the utilization of such strategy has become complex due to a phenomenon described as network ossification (MCKEOWN et al., 2008). In order to provide solutions to the problems of the actual data networks architecture and provide greater flexibility, comes in scene the SDN technology. The SDN architecture unleashes a new horizon of possibilities to the networks. This work proposes the VoIPath solution, which consists of a implementation of a SDN based path selection technique, oriented by specific relevant attributes to the VoIP traffic. A algorithm created with linear programming is employed to compute these attributes and identify the best paths to the VoIP traffic, which is divided through the network, in according to execution parameters. In order to control the traffic propagation is employed the VTN technology, which consists on an SDN based solution. Through VTN technology the VoIP traffic is forwarded through an logical network called tenant. The mapping of the tenant over the physical network ensures that the selected paths are employed. To ensure the solution’s effectiveness a series of experiments are performed and the impact of its’s execution on the audio is calculated with the usage of an VoIP quality measurement evaluation model.

No description available.

This dissertation is concerned with the design of a high speed fiber optic campus backbone network which not only provides a high bandwidth connection to various LANs, PBXs, ISDNs, supercomputers, and other high speed computing facilities but also offers an integrated service of voice and data. The campus backbone network is based on an optical fiber dual ring structure. A new token ring protocol based on the IEEE 802.5 standard is proposed as the medium access protocol for the backbone network. In the proposed token ring network, the token holder transmits packets in an exhaustive way when no other nodes want to transmit voice packets. If any node has voice packets waiting for transmission, the token holder can transmit only a single packet during its access opportunity. In this way, not only can the voice delay be bounded at high voice traffic intensities, but a high data throughput can be achieved at low voice traffic intensities. The potential use of Time Division Multiplexing (TDM) was also considered, but the TDM technique was found to be less suitable for our campus environment mainly due to its low efficiency in bursty environments and complex hardware requirements. The backbone network was simulated using the Simscript II.5 discrete event simulation language. The simulation results indicated that the proposed token ring protocol provides satisfactory performances in every respect. A network interface unit (NIU) was designed, which consists of optical transmitter, receiver, and fault tolerance mechanisms as well as the protocol engine. The optimal values of major parameters for the NIU design were determined by the simulation.

This dissertation describes the analysis, design, and implementation of a session level communication system referred to as PLEXNET. PLEXNET was developed specifically to provide communication services required by Computer Supported Cooperative Work (CSCW) applications but which are not currently available as part of commercially available LAN products. CSCW services include such things as: reliable broadcast communications, dynamic multicasting, and message queuing. Analysis of CSCW networking requirements entailed: reviewing CSCW applications and communications systems; synthesizing a data exchange model for collaborative tools; and defining a target system (PC-LAN). PLEXNET design provides a discussion of: networking tradeoffs, the relationship between PLEXNET and NETBIOS, PLEXNET queue structure, and PLEXNET implementation details. The design and implementation of PLEXNET were validated by performing discrete event simulations comparing response times and resource utilization for three communication paradigms and by developing four collaborative applications which employ PLEXNET for data communications. These applications are: Multi-User LAN Editor, Electronic Discussion System, Contracts Procurement, and Video Switcher.

No description available.

The description of a Network Management Package (NMP) for Packet Communications Units (PCUs) in a Local Area Network (LAN) is presented. The LAN consists of a Sytek LocalNet 20, a Sytek System 2000, a Sytek System 6000, and a Concord Data Systems Token/Net. The NMP accesses and controls the local and remote PCUs on the networks. The communication interface software module is responsible for opening and closing the session between the PC and PCU ports. The NMP supports a set of operations used by a network manager to control and manage the network PCUs. The user uses the NMP to integrate each PCU and check and set its attributes. The NMP was developed to run in the Computer Engineering Research Laboratory and in the University of Arizona broadband cable plant. The NMP allows different PCUs (local or remote) to check and modify PCU's attributes while users work on their own PCUs. (Abstract shortened with permission of author.)

There are three main results in this dissertation. They are PLS-completeness of discrete Hopfield network convergence with eight different restrictions, (degree 3, bipartite and degree 3, 8-neighbor mesh, dual of the knight's graph, hypercube, butterfly, cube-connected cycles and shuffle-exchange), exponential convergence behavior of discrete Hopfield network, and simulation of Turing machines by discrete Hopfield Network.