Search (1511 results, page 1 of 76)

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Date

17. 7.1996 9:33:22

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Abstract

In this research study, Nemertes performed an independent in-depth analysis of Internet and IP infrastructure (which we call capacity) and current and projected traffic (which we call demand) with the goal of understanding how each has changed over time, and determining if there will ever be a point at which demand exceeds capacity. To assess infrastructure capacity, we reviewed details of carrier expenditures and vendor revenues, and compared these against market research studies. To compute demand, we took a unique approach: Instead of modeling user behavior based on measuring the application portfolios that users had currently deployed, and projecting deployment of those applications in future, we looked directly at how user consumption of available bandwidth has changed over time.

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Date

22. 8.2009 19:50:27

Issue

2. Aufl. - Hergestellt on demand

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Abstract

Follows up the common assertion that consumer services will be the major driving force for the information superhighway by discussing the social and political factors likely to influence the rate of progress and the role of major consumer entertainment and information applications. Considers the trends in interactive television and system requirements for 'movies on demand', particularly in university department. Concludes that successful services offered at a price leading to mass demand will be slow in arriving

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Abstract

Summarizes and comments on Bruce Egan's recent book Information superhighways: the economics of advanced public communications networks, which addresses transitional problems on the road to a universal broadband network in the USA. Surveys the major technological components of the future system and explains key features of likely cost structures and describes demand pull considerations. Gives a breakdown of major supplier stakeholder groups and their roles in this transition period. Highlights possible setbacks and emerging alliances as well as alternative scenarios arising from additional developments. Discusses implcations for future public policy initiatives

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Abstract

The use of information technology for consumers in the private households gains in importance. A whole new world of computerized home applications is already in place or under development. The market potential for the future will arise from the fact that information technology influences all parts of our private lifes as shows the discussion on information superhighways, video-on-demand or interactive TV

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Abstract

A common problem encountered in Web improvement is how to arrange the homepage links of a Website. This study analyses Web information search behavior, and applies the multiple demand theory to propose two models to help a visitor allocate time for multiple links. The process of searching is viewed as a formal choice problem in which the visitor attempts to choose from multiple Web links to maximize the total utility. The proposed models are calibrated to clickstream data collected from an educational institute over a seven-and-a-half month period. Based on the best fit model, a metric, utility loss, is constructed to measure the performance of each link and arrange them accordingly. Empirical results show that the proposed metric is highly efficient for prioritizing the links on a homepage and the methodology can also be used to study the feasibility of introducing a new function in a Website.

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Abstract

This paper reflects on some major aspects related to library subject access systems in the era of networked information. The main argument builds on the fact that we nowadays witness the strongest demand and expectation on subject access tools, coming from far beyond the traditional library world, but the field remains the weakest side of international librarianship. While the emergence to cope with the practical challenges of a wider environment is emphasized, the need to reinforce the internationalization of knowledge organization as a professional library matter is stressed, not only at the pragmatic level but also, more importantly, in theoretical terms.

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Abstract

Reviews a range of issues associated with the provision of networked information services: document formats (structured documents, SGML/HTML and other standards, graphics file formats); quality assurance; resource identification and description (URL, URN, URC, URA); discovery techniques; access issues (terminal access, server access, gateways to the WWW); document delivery issues (on demand electronic resources, electronic payment services (CAFE, WebDoc, NetBill, InterPay)

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Abstract

Discusses the need for, demand for, and problems of regulating access to the Internet, particularly in the light of the availability of services which some people might consider to be offensive (such as pornography), and describes the results of a 2 part survey into the question. In the first part of the study, the WWW was searched for newsgropus which could be regarded as being offensive to some (a list is included as an appendix). 65 sites on the WWW were found to contain images which could cause offence, though relatively few might be considered 'pornographic', and most had some form of control exercised by the site owner. A number of sites had closed down due to the demand placed upon them, but there was also evidence of closure by another body. The second part of the study reports on the measures taken by UK universities to control access by staff and students. The majority were found to exercise no control other than that recommended by the UK Education and Research Networking Association (UKERNA), but the principle reason given is the impracticality of controlling the Internet, rather than content. Argues that regulation would damage the free flow of information over the Internet, which provides an unprecedented opportunity for the exchange of information on a global scale

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Abstract

With the establishment of the WWW as a standard information tool in academic libraries, there is a greater demand for research assistance than ever before. Reference questions involve more teaching time given the number of interfaces clients confront as they navigate the book catalogue, electronic databases, and the WWW. Librarians require expert knowledge of multiple search strategies as well as the ability to teach others how to apply them effectively. Outlines hoe the WWW can function as a desktop publishing system, revitalize subject pathfinders and 'how to' guides, and promote the invention of interactive library tutorials. A Web site presenting design ideas accompanies this article at: http://stauffer.queensu.ca/inforef/tutorials/cla/clahome.htm

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Abstract

As the Web has become a major channel of information dissemination, many newspapers expand their services by providing electronic versions of news information on the Web. However, most investors find it difficult to search for the financial information of interest from the huge Web information space-information overloading problem. In this article, we present a personal agent that utilizes user profiles and user relevance feedback to search for the Chinese Web financial news articles on behalf of users. A Chinese indexing component is developed to index the continuously fetched Chinese financial news articles. User profiles capture the basic knowledge of user preferences based on the sources of news articles, the regions of the news reported, categories of industries related, the listed companies, and user-specified keywords. User feedback captures the semantics of the user rated news articles. The search engine ranks the top 20 news articles that users are most interested in and report to the user daily or on demand. Experiments are conducted to measure the performance of the agents based on the inputs from user profiles and user feedback. It shows that simply using the user profiles does not increase the precision of the retrieval. However, user relevance feedback helps to increase the performance of the retrieval as the user interact with the system until it reaches the optimal performance. Combining both user profiles and user relevance feedback produces the best performance

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Content

A special issue devoted to visualization and graphics on the WWW

Date

1. 8.1996 22:08:06

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Date

17. 7.1996 9:33:22

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Abstract

The use of codes and other methods of concealing the contents of messages is as old as recorded information. With the advent of computer communication, the need for a method of ensuring secure communication over insecure channels, such as the Internet, has seen an increased demand for good cryptography. However, the recent availability of public domain public key encryption software, such as Philip R. Zimmermann's Pretty Good privacy (PGP), has been seen by some as betraying the principles of security and has raised issues of national communication policy and personal privacy. In the USA, the government's Clipper encryption chip initiative sought to implement a key escrow system which would enable law enforcement agencies to wiretap all digital communication. Civil liberty opponents of key escrow systems argue that they will not affect criminals, and fear that they can only be made effective by banning the use of alternative encryption systems, such as PGP. Describes methods for obtaining and using PGP to encrypt and decrypt electronic mail messages

Source

Journal of information science. 22(1996) no.2, S.133-146

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Abstract

Considers the role and nature of current awareness services with particular reference to the impact of electronic media, the Internet and WWW on the 5 basic components of these services: databases; user interest profiles; notifications; feedback and document delivery

Date

22. 2.1999 17:50:37

Source

Online and CD-ROM review. 22(1998) no.4, S.277-279

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Abstract

Describes tools for searching information on the Internet including guides, subject catalogues, lists, and automatic indexing

Date

1. 8.1996 22:01:00

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Footnote

Rez. in: Journal of academic librarianship. 22(1996) no.6, S.472 (B.J. Scales)

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Abstract

The Internet Web environment opens up extraordinary opportunities for user access to information. Techniques for monitoring users and systems and for evaluating system design and performance have not kept pace with Web development. This article reviews concepts of Web operations (including browsers, clients, information retrieval applications, servers, and data communications systems) with specific attention given to how monitoring should take place and how privacy can be protected. It examines monitoring needs of users, systems designers, managers, and customer support staff and outlines measures for workload, capacity, and performance for hardware, software, and data communications systems. Finally, the article proposes a client-server design for monitoring, which involves creation of a series of server and client systems to obtain and process transaction and computer performance information. These systems include: a log server, which captures all levels of transactions and packets on the network; a monitor server, which sythesizes the log and packet data; an assistance server, which processes requests for information and help from the Web server in real time; and an accounting server, which authenticates user access to the system. A special system administrator client is proposed to control the monitoring system, as is a system information cleint to receive real-time and on-demand reports of system activity