451 research outputs found
Description and Experience of the Clinical Testbeds
This deliverable describes the up-to-date technical environment at three clinical testbed demonstrator sites of
the 6WINIT Project, including the adapted clinical applications, project components and network transition technologies
in use at these sites after 18 months of the Project. It also provides an interim description of early experiences with
deployment and usage of these applications, components and technologies, and their clinical service impact
INTERNET MAPPING
Geographical Information System (GIS) are methods to visualize, manipulate,
analyze, and display spatial data. GIS application software such as Arc View or
Maplnfo allows the integration of such GIS maps with programming language
software such as Visual Basic. As we all know, internet has been a major
information distribution channel. If we could integrate both GIS map and serves it
in a web browser medium, we could provide GIS applications online, the users
could manipulate and handle each map with their own choice. In order to create
the Internet map that allows GIS map, Arc IMS will be use. ArcIMS runs in a
distributed environment and consists of both client and server components. The
ArcIMS HTML Viewer and ArcIMS Java Viewers are client-side components.
The ArcIMS Spatial Server, ArcIMS Application Server, ArcIMS Application
Server Connectors, and ArcIMS Manager are server-side components. As a
conclusion, Internet mapping benefits the user by clearly indication GIS data to
them
04441 Abstracts Collection -- Mobile Information Management
From 24.10.04 to 29.10.04, the
Dagstuhl Seminar 04441 ``Mobile Information Management\u27\u27 was held
in the International Conference and Research Center (IBFI),
Schloss Dagstuhl.
During the seminar, several participants presented their current
research, and ongoing work and open problems were discussed. Abstracts of
the presentations given during the seminar as well as abstracts of
seminar results and ideas are put together in this paper. The first section
describes the seminar topics and goals in general.
Links to extended abstracts or full papers are provided, if available
IPv6 Network Mobility
Network Authentication, Authorization, and Accounting has
been used since before the days of the Internet as we know it
today. Authentication asks the question, âWho or what are
you?â Authorization asks, âWhat are you allowed to do?â And fi nally,
accounting wants to know, âWhat did you do?â These fundamental
security building blocks are being used in expanded ways today. The
fi rst part of this two-part series focused on the overall concepts of
AAA, the elements involved in AAA communications, and highlevel
approaches to achieving specifi c AAA goals. It was published in
IPJ Volume 10, No. 1[0]. This second part of the series discusses the
protocols involved, specifi c applications of AAA, and considerations
for the future of AAA
An Architecture for Global Distributed SIP Network Using IPv4 Anycast
Tato diplomovĂĄ prĂĄce se zabĂœvĂĄ metodami pro vĂœbÄr nejbliĆŸĆĄĂ RTP proxy k VoIP klientĆŻm s pouĆŸitĂm IP anycastu. RTP proxy servery jsou umĂstÄny v sĂti Internetu a pĆeposĂlajĂ RTP data pro VoIP klienty za sĂĆ„ovĂœmi pĆekladaÄi adres(NAT). Bez zemÄpisnÄ rozmĂstÄnĂœch RTP proxy serverĆŻ a metod pro nalezenĂ nejbliĆŸĆĄĂho RTP proxy serveru by doĆĄlo ke zbyteÄnĂ©mu poklesu kvality pĆenosu mĂ©dialnĂch dat a velkĂ©mu zpoĆŸdenĂ. Tento dokument navrhuje 4 metody a jejich porovnĂĄnĂ s podrobnÄjĆĄĂmi rozbory metod s vyuĆŸitĂm DNS resolvovĂĄnĂ a pĆĂmo SIP protokolu. Tento dokument takĂ© obsahuje mÄĆenĂ chovĂĄnĂ IP anycastu v porovnĂĄnĂ mezi metrikami smÄrovĂĄnĂ a metrikami ÄasovĂœmi. Nakonec dokumentu je takĂ© uvedena implemetace na SIP Express Router platformÄ.This thesis is about using IP anycast-based methods for locating RTP proxy servers close to VoIP clients. The RTP proxy servers are hosts on the public Internet that relay RTP media between VoIP clients in a way that accomplishes traversal over Network Address Translators (NATs). Without geographically-dispersed RTP proxy servers and methods to find one in client's proximity, voice latency may be unbearably long and dramatically reduce perceived voice quality. This document proposes four methods their comparison with further design of DNS-based and SIP-based methods. It includes IP anycast measurements that provides an overview of IP anycast behaviour in terms of routing metrics and latency metrics. It also includes implementation on SIP Express Router platform.
A Model for Managing Information Flow on the World Wide Web
Metadata merged with duplicate record (http://hdl.handle.net/10026.1/330) on 20.12.2016 by CS (TIS).This is a digitised version of a thesis that was deposited in the University Library. If you are the author please contact PEARL Admin ([email protected]) to discuss options.This thesis considers the nature of information management on the World Wide Web. The
web has evolved into a global information system that is completely unregulated, permitting
anyone to publish whatever information they wish. However, this information is almost
entirely unmanaged, which, together with the enormous number of users who access it, places
enormous strain on the web's architecture. This has led to the exposure of inherent flaws,
which reduce its effectiveness as an information system.
The thesis presents a thorough analysis of the state of this architecture, and identifies three
flaws that could render the web unusable: link rot; a shrinking namespace; and the inevitable
increase of noise in the system. A critical examination of existing solutions to these flaws is
provided, together with a discussion on why the solutions have not been deployed or adopted.
The thesis determines that they have failed to take into account the nature of the information
flow between information provider and consumer, or the open philosophy of the web. The
overall aim of the research has therefore been to design a new solution to these flaws in the
web, based on a greater understanding of the nature of the information that flows upon it.
The realization of this objective has included the development of a new model for managing
information flow on the web, which is used to develop a solution to the flaws. The solution
comprises three new additions to the web's architecture: a temporal referencing scheme; an
Oracle Server Network for more effective web browsing; and a Resource Locator Service,
which provides automatic transparent resource migration. The thesis describes their design
and operation, and presents the concept of the Request Router, which provides a new way of
integrating such distributed systems into the web's existing architecture without breaking it.
The design of the Resource Locator Service, including the development of new protocols for
resource migration, is covered in great detail, and a prototype system that has been developed
to prove the effectiveness of the design is presented. The design is further validated by
comprehensive performance measurements of the prototype, which show that it will scale to
manage a web whose size is orders of magnitude greater than it is today
An appraisal of secure, wireless grid-enabled data warehousing
In most research, appropriate collections of data play a significant role in aiding decision-making processes. This is more critical if the data is being accessed across organisational barriers. Further, for the data to be mined and analysed efficiently, to aid decision-making processes, it must be harnessed in a suitably-structured fashion. There is, for example, a need to perform diverse data analyses and interpretation of structured (non-personal) HIV/AIDS patient-data from various quarters in South Africa. Although this data does exist, to some extent, it is autonomously owned and stored in disparate data storages, and not readily available to all interested parties. In order to put this data to meaningful use, it is imperative to integrate and store this data in a manner in which it can be better utilized by all those involved in the ontological field. This implies integration of (and hence, interoperability), and appropriate accessibility to, the information systems of the autonomous organizations providing data and data-processing. This is a typical problem-scenario for a Virtual Inter-Organisational Information System (VIOIS), proposed in this study. The VIOIS envisaged is a hypothetical, secure, Wireless Grid-enabled Data Warehouse (WGDW) that enables IOIS interaction, such as the storage and processing of HIV/AIDS patient-data to be utilized for HIV/AIDS-specific research. The proposed WDGW offers a methodical approach for arriving at such a collaborative (HIV/AIDS research) integrated system. The proposed WDGW is virtual community that consists mainly of data-providers, service-providers and information-consumers. The WGDW-basis resulted from systematic literaturesurvey that covered a variety of technologies and standards that support datastorage, data-management, computation and connectivity between virtual community members in Grid computing contexts. A Grid computing paradigm is proposed for data-storage, data management and computation in the WGDW. Informational or analytical processing will be enabled through data warehousing while connectivity will be attained wirelessly (for addressing the paucity of connectivity infrastructure in rural parts of developing countries, like South Africa)
An appraisal of secure, wireless grid-enabled data warehousing
In most research, appropriate collections of data play a significant role in aiding decision-making processes. This is more critical if the data is being accessed across organisational barriers. Further, for the data to be mined and analysed efficiently, to aid decision-making processes, it must be harnessed in a suitably-structured fashion. There is, for example, a need to perform diverse data analyses and interpretation of structured (non-personal) HIV/AIDS patient-data from various quarters in South Africa. Although this data does exist, to some extent, it is autonomously owned and stored in disparate data storages, and not readily available to all interested parties. In order to put this data to meaningful use, it is imperative to integrate and store this data in a manner in which it can be better utilized by all those involved in the ontological field. This implies integration of (and hence, interoperability), and appropriate accessibility to, the information systems of the autonomous organizations providing data and data-processing. This is a typical problem-scenario for a Virtual Inter-Organisational Information System (VIOIS), proposed in this study. The VIOIS envisaged is a hypothetical, secure, Wireless Grid-enabled Data Warehouse (WGDW) that enables IOIS interaction, such as the storage and processing of HIV/AIDS patient-data to be utilized for HIV/AIDS-specific research. The proposed WDGW offers a methodical approach for arriving at such a collaborative (HIV/AIDS research) integrated system. The proposed WDGW is virtual community that consists mainly of data-providers, service-providers and information-consumers. The WGDW-basis resulted from systematic literaturesurvey that covered a variety of technologies and standards that support datastorage, data-management, computation and connectivity between virtual community members in Grid computing contexts. A Grid computing paradigm is proposed for data-storage, data management and computation in the WGDW. Informational or analytical processing will be enabled through data warehousing while connectivity will be attained wirelessly (for addressing the paucity of connectivity infrastructure in rural parts of developing countries, like South Africa)
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