World Wide Web Server Research Articles

Lessons from analysis of World Wide Web server activity data: http://www.swsahs.nsw.gov.au/livtrauma.

To establish visiting patterns and use of resources within an educational world wide web site, to develop strategies for its more effective use as a teaching medium. Prospective descriptive study. A web site maintained by a major Australian metropolitan trauma service. All visitors to the web site over a 40 day period. Number of visitors, requests for pages, and transfer of files; timing and duration of visits; first and last pages viewed during visits; pages viewed most often; source of referral and country of origin of visitors. There were 2237 visits, and a mean of 5.8 pages/visit were viewed. Mean duration of each visit was 4 minutes 35 seconds, and only half the visitors entered through the home page. The collection of radiographs was most commonly consulted. Visitors came from 26 different countries, 42% from Australia. Factors that influenced the use of the site were identified and have altered our plans for development.

International health on the World Wide Web.

WWW.WHO.INT This address will take you to the Web site of the World Health Organization (WHO). Its is an attractive Web site, with lots of color and photographs. It also is updated frequently. Finally, it is thick and rich, with layers of layers of information. The opening screen gives you a list of frames that you can click to explore the site. Some of these provide information about WHO--how it is organized, what its mission is. To look at the distribution of a particular disease around the world, click on health topics, which will give you a list of diseases; if you click on communicable/infectious diseases, you get a list of specific diseases. If you click on HIV/AIDS, you can find out about an upcoming conference in Paris, you can read the newsletter of the HIV/AIDS Western Pacific region, or you can delve into epidemiological data on HIV/AIDS from around the world. Health topics also include Environmental and lifestyle, which allows you to explore WHO projects on mental health. For a good overview of world health, go back to the and click on Reports. From the screens behind this frame, you can look at the annual World Health Report, which includes tables on disease and disease trends around the world. Also included are data on infant mortality, tobacco use, and general demographic information. The tables are available in two formats: Adobe and Microsoft Excel. (If you do not have Adobe Acrobat on your computer, you can download it easily by clicking on the ADOBE icon-Get Acrobat Reader--which comes on the screen when you ask to see disease statistics.) There is also a section on the home page called News. Although some of the news is of limited interest, there are some interesting articles. This section also provides access to press releases, a photograph library, and even video and radio clips. Another option on the home page is Sources. This is a surfers' heaven! You can go to the library and conduct a search. Or you can pull up a list of health-related World Wide Web servers and explore Web sites from around the world. The Sources section also lists the WHOSIS, which is the Statistical Information System. It offers a rich list of topics for those interested in data, and if this is not enough for you, there is also an excellent set of links to other resources for statistical information. The WHO Web site is an excellent place to delve further into issues of world health, to gather information, and to learn about WHO projects, programs, and policies. It can provide extensive information, whether you are interested in a particular country or region or want a world overview of a particular disease. WWW.NETAID.ORG This is an interesting new site, designed to help alleviate poverty around the world by harnessing the power of the Internet. The site is attractive and easy to navigate. It is not a site designed for professionals, so information provided is sometimes superficial and there is a glitzy feel to the information presented, as if it were developed by a marketing firm. The site also is designed for fund-raising, and as you navigate through, you are asked repeatedly to contribute and sign on. Although I found this irritating, it was also exciting to see how the Internet could be used to increase communication and to generate support for small projects in developing countries. …

Radiation hybrid map of the mouse genome.

Radiation hybrid (RH) maps are a useful tool for genome analysis, providing a direct method for localizing genes and anchoring physical maps and genomic sequence along chromosomes. The construction of a comprehensive RH map for the human genome has resulted in gene maps reflecting the location of more than 30,000 human genes. Here we report the first comprehensive RH map of the mouse genome. The map contains 2,486 loci screened against an RH panel of 93 cell lines. Most loci (93%) are simple sequence length polymorphisms (SSLPs) taken from the mouse genetic map, thereby providing direct integration between these two key maps. We performed RH mapping by a new and efficient approach in which we replaced traditional gel- or hybridization-based assays by a homogeneous 5'-nuclease assays involving a single common probe for all genetic markers. The map provides essentially complete connectivity and coverage across the genome, and good resolution for ordering loci, with 1 centiRay (cR) corresponding to an average of approximately 100 kb. The RH map, together with an accompanying World-Wide Web server, makes it possible for any investigator to rapidly localize sequences in the mouse genome. Together with the previously constructed genetic map and a YAC-based physical map reported in a companion paper, the fundamental maps required for mouse genomics are now available.

A World Wide Web-service to aid the development of AMBER parameters using analogy to standard parameters

A World-Wide Web service has been constructed to assist the development of force field parameters extending the AMBER force fields. This service extracts parameters from the standard AMBER force field parameter databases. From a Web-based interface the user can choose between bond, angle and torsional parameters with certain constraints on element and/or atom hybridization. The software constructed for the purpose of finding appropriate parameters will locate standard AMBER force field parameters matching the user specification. For bond and angle parameters a scatter plot of the reference values against force constants is provided. This service has been produced to assist in extraction and evaluation of parameters that may be useful for molecules other than proteins and nucleic acids.

The Library and Information Professional's Guide to the World Wide Web

World Wide Web technology is having profound implications for the development of all types of information and library services. This companion volume to Library and Information Professional's Guide to the Internet shows the reader actual implementations in a variety of information work settings. The guide takes an in-depth look into the technology of the WWW and its applications for information work, clearly explaining challenging and technical topics. The book's particular focus is on setting up and managing a WWW server, with pointers to software and a practical guide to building HTML pages. The authors also suggest possible applications of the WWW in libraries as well as in public and private sector organizations. Including detailed manuals and reference materials, the contents cover: introduction to WWW software and communications technology; an investigation of current and envisaged applications of the World Wide Web; World Wide Web technology; setting up and managing a World Wide Web server; and resource guide: introduction to WWW; applications of WWW; and WWW technology. This guide should be valuable to all librarians, information professinals and students. It should also be useful for all organizations engaged in the external provision of information to the public, or internally to staff.

Dynamic web server construction on the intranet using a change management framework

As organizations increasingly emphasize effective collaborative working through networked systems, the World Wide Web (WWW) server and associated intranet technologies are gaining wider acceptance as a new enterprisewide information systems paradigm. In an intranet collaborative working environment, data used in the web server are usually modified more frequently than are those used in a traditional Internet web server. Thus, to support synchronous collaboration without causing any inconsistency among multiple concurrent users, the intranet web server must provide users with synchronized and consistent views of shared data. However, current web technologies have limitations in supporting this, largely because the existing Hypertext Transfer Protocol (HTTP) is unidirectional and does not allow web servers to send messages to their web browsers without first receiving requests from them. This paper proposes a web-based change management framework that can overcome such limitations and support synchronous collaboration in an intranet computing environment. The web-based change management framework facilitates management of dependency relationships between shared data in the web server and dependent user views in the client web browser and allows the web server to actively propagate changing details of the shared objects to all users referencing them. On the basis of the change management framework, we propose a dynamic web server that can support synchronous collaboration in various intranet-based collaborative systems including concurrent engineering design systems and electronic approval systems. The prototype system of the dynamic web server is developed on a commercial Object-oriented Database Management System (ODBMS) called OBJECTSTORE using the C++ programming language. Copyright © 1999 John Wiley & Sons, Ltd.

Dynamic web server construction on the intranet using a change management framework

As organizations increasingly emphasize effective collaborative working through networked systems, the World Wide Web (WWW) server and associated intranet technologies are gaining wider acceptance as a new enterprisewide information systems paradigm. In an intranet collaborative working environment, data used in the web server are usually modified more frequently than are those used in a traditional Internet web server. Thus, to support synchronous collaboration without causing any inconsistency among multiple concurrent users, the intranet web server must provide users with synchronized and consistent views of shared data. However, current web technologies have limitations in supporting this, largely because the existing Hypertext Transfer Protocol (HTTP) is unidirectional and does not allow web servers to send messages to their web browsers without first receiving requests from them. This paper proposes a web-based change management framework that can overcome such limitations and support synchronous collaboration in an intranet computing environment. The web-based change management framework facilitates management of dependency relationships between shared data in the web server and dependent user views in the client web browser and allows the web server to actively propagate changing details of the shared objects to all users referencing them. On the basis of the change management framework, we propose a dynamic web server that can support synchronous collaboration in various intranet-based collaborative systems including concurrent engineering design systems and electronic approval systems. The prototype system of the dynamic web server is developed on a commercial Object-oriented Database Management System (ODBMS) called OBJECTSTORE using the C++ programming language. Copyright © 1999 John Wiley & Sons, Ltd.

Establishing instructional resources on the Web: a joint‐university effort

Co‐ordinated by their scholarly association, textile/apparel faculty from multiple universities have succeeded in establishing a World Wide Web server dedicated to providing information from across their disciplines to enhance instruction. The process of server establishment and Web‐site creation including funding, determination of information for posting, problems encountered, and future plans are reviewed. Other faculty could use this as a guide in establishing servers and Web sites for their own disciplines.

The Enhanced Microbial Genomes Library.

Since the obtention of the complete sequence of Haemophilus influenzae Rd in 1995, the number of bacterial genomes entirely sequenced has regularly increased. A problem is that the quality of the annotations of these very large sequences is usually lower than those of the shorter entries encountered in the repository collections. Moreover, classical sequence database management systems have difficulties in handling entries of that size. In this context, we have decided to build the Enhanced Microbial Genomes Library (EMGLib) in which these two problems are alleviated. This library contains all the complete genomes from bacteria already sequenced and the yeast genome in GenBank format. The annotations are improved by the introduction of data on codon usage, gene orientation on the chromosome and gene families. It is possible to access EMGLib through two database systems set up on World Wide Web servers: the PBIL server at http://pbil.univ-lyon1.fr/emglib/emglib. html and the MICADO server at http://locus.jouy.inra.fr/micado

A computerised calibration service supporting system. II: A web interface design

This research combines information technology in the Standard of Exchange Product model data (STEP) and Internet communication by constructing a user interface for object-oriented database management system on a world wide web (WWW) server. To construct the user interface, we chose an enterprise as our case system. Then, we analysed the workflow of the case company and the interface of its database. The database interface was then transferred from a DOS system to a Web system. Finally, the new system was tested and evaluated. It is shown that the regular business processes can be integrated through Internet communications, but some limitations still exist. In addition, some comments and the guidelines for designing the user WWW interface are documented for designers to refer to.

Distributions of surfers’ paths through the World Wide Web: Empirical characterizations

Surfing the World Wide Web (WWW) involves traversing hyperlink connections among documents. The ability to predict surfing patterns could solve many problems facing producers and consumers of WWW content. We analyzed WWW server logs for a WWW site, collected over ten days, to compare different path reconstruction methods and to investigate how past surfing behavior predicts future surfing choices. Since log files do not explicitly contain user paths, various methods have evolved to reconstruct user paths. Session times, number of clicks per visit, and Levenshtein Distance analyses were performed to show the impact of various reconstruction methods. Different methods for measuring surfing patterns were also compared. Markov model approximations were used to model the probability of users choosing links conditional on past surfing paths. Information-theoretic (entropy) measurements suggest that information is gained by using longer paths to estimate the conditional probability of link choice given surf path. The improvements diminish, however, as one increases the length of path beyond one. Information-theoretic (total divergence to the average entropy) measurements suggest that the conditional probabilities of link choice given surf path are more stable over time for shorter paths than longer paths. Direct examination of the accuracy of the conditional probability models in predicting test data also suggests that shorter paths yield more stable models and can be estimated reliably with less data than longer paths.

Protein identification and analysis tools in the ExPASy server.

Protein identification and analysis software performs a central role in the investigation of proteins from two-dimensional (2-D) gels and mass spectrometry. For protein identification, the user matches certain empirically acquired information against a protein database to define a protein as already known or as novel. For protein analysis, information in protein databases can be used to predict certain properties about a protein, which can be useful for its empirical investigation. The two processes are thus complementary. Although there are numerous programs available for those applications, we have developed a set of original tools with a few main goals in mind. Specifically, these are: 1. To utilize the extensive annotation available in the Swiss-Prot database wherever possible, in particular the position-specific annotation in the Swiss-Prot feature tables to take into account posttranslational modifications and protein processing. 2. To develop tools specifically, but not exclusively, applicable to proteins prepared by two dimensional gel electrophoresis and peptide mass fingerprinting experiments. 3. To make all tools available on the World-Wide Web (WWW), and freely usable by the scientific community. In this chapter we give details about protein identification and analysis software that is available through the ExPASy World Wide Web server.

Tandem repeats finder: a program to analyze DNA sequences.

A tandem repeat in DNA is two or more contiguous, approximate copies of a pattern of nucleotides. Tandem repeats have been shown to cause human disease, may play a variety of regulatory and evolutionary roles and are important laboratory and analytic tools. Extensive knowledge about pattern size, copy number, mutational history, etc. for tandem repeats has been limited by the inability to easily detect them in genomic sequence data. In this paper, we present a new algorithm for finding tandem repeats which works without the need to specify either the pattern or pattern size. We model tandem repeats by percent identity and frequency of indels between adjacent pattern copies and use statistically based recognition criteria. We demonstrate the algorithm's speed and its ability to detect tandem repeats that have undergone extensive mutational change by analyzing four sequences: the human frataxin gene, the human beta T cellreceptor locus sequence and two yeast chromosomes. These sequences range in size from 3 kb up to 700 kb. A World Wide Web server interface atc3.biomath.mssm.edu/trf.html has been established for automated use of the program.

Server capacity planning for Web traffic workload

The goal of the paper is to provide a methodology for determining bandwidth requirements for various hardware components of a World Wide Web server. The paper assumes a traditional symmetric multiprocessor (SMP) architecture for the Web server, although the same analysis applies to an SMP node in a cluster. The paper derives formulae for bandwidth demands for memory, processor data bus, network adapters, disk adapters, I/O memory paths, and I/O buses. Since the Web workload characteristics vary widely, three sample workloads are considered for illustrative purposes: 1) standard SPECweb96; 2) a SPECweb96-like workload that assumes dynamic data and retransmissions; and 3) WebProxy, which models a Web proxy server that does not do much caching, and thus has rather severe requirements. The results point to a few general conclusions regarding Web workloads. In particular, reduction in memory/data bus bandwidth by using the virtual interface architecture (VIA) is very desirable, and the connectivity needs may go well beyond the capabilities of traditional systems based on the traditional PCI-bus. Web workloads also demand a significantly higher memory bandwidth than data bus bandwidth and this disparity is expected to increase with the use of VIA. Also, the current efforts to offload TCP/IP processing may require a larger headroom in I/O subsystem bandwidth than in the processor-memory subsystem.

Application-level differentiated services for Web servers

The current World Wide Web service model treats all requests equivalently, both while being processed by servers and while being transmitted over the network. For some uses, such as Web prefetching or multiple priority schemes, different levels of service are desirable. This paper presents three simple, server-side, application-level mechanisms (limiting process pool size, lowering process priorities, limiting transmission rate) to provide two different levels of Web service (regular and low priority). We evaluated the performance of these mechanisms under combinations of two foreground workloads (light and heavy) and two levels of available network bandwidth (10 Mb/s and 100 Mb/s). Our experiments show that even with background traffic sufficient to saturate the network, foreground performance is reduced by at most 4–17%. Thus, our user-level mechanisms can effectively provide different service classes even in the absence of operating system and network support.

Evaluating Internet information services in the Asia‐Pacific region

States that there has been a trend for publications in the Asia‐Pacific region to move to a combined print and electronic medium, in an effort to achieve the goals of social equity and increased exposure to the worldwide community through the World Wide Web (WWW). Reviews some of the mechanisms by which this transition can be evaluated with respect to these two goals, both economically, but more importantly, in terms of user‐behaviour recorded WWW server access logs. The auditing of these logs facilitates new forms of market research which are impossible to conduct on traditional paper publications, as objective, quantitative information about usage patterns can be measured directly from key variables such as country of origin, most popular content pages, and typical access errors. It is argued that these audits can be used effectively for future planning, developing popular content areas, and creating publicity policy for electronic publications. The transition to a joint paper and electronic format for the South Pacific Journal of Psychology is presented in a three‐month case study, with important issues, such as the importance of indigenous contributions, being resolved using statistics computed from the server access logs.

A Multi-Instrument Virtual Collaborative Environment VIA the Worldwide-Web at Nist

Abstract Control of electron microscopes by a remote networked computer system has been implemented successfully in a variety of ways including via the World Wide Web (WWW). This approach works well with users who are familiar with the operation of the instrument and are experienced microscopists. However, many of our collaborations involve other scientists or engineers looking to us for analytical expertise. In order to accommodate collaborators with a broad range of skills and to allow them to interact remotely, in near-real time with a scientist operating an instrument, we have implemented a Virtual Collaborative Environment (VCE) based on a WWW server and the use of the server-push protocol. The system developed at NIST is a frames-based WWW page that is presented to the user with an index of instruments on the left side (FIG.l), live video pages to the right side, and a download area (via ftp) toward the bottom for data and high resolution images.

인터넷을 이용한 문제은행 공동저작 및 능동적 원격 개별 학습 시스템의 구현

인터넷을 이용한 문제은행 공동저작 및 능동적 원격 개별 학습 시스템의 구현

Reduced space hidden Markov model training.

Complete forward-backward (Baum-Welch) hidden Markov model training cannot take advantage of the linear space, divide-and-conquer sequence alignment algorithms because of the examination of all possible paths rather than the single best path. This paper discusses the implementation and performance of checkpoint-based reduced space sequence alignment in the SAM hidden Markov modeling package. Implementation of the checkpoint algorithm reduced memory usage from O(mn) to O (m square root n) with only a 10% slowdown for small m and n, and vast speed-up for the larger values, such as m = n = 2000, that cause excessive paging on a 96 Mbyte workstation. The results are applicable to other types of dynamic programming. A World-Wide Web server, as well as information on obtaining the Sequence Alignment and Modeling (SAM) software suite, can be found at http://www.cse.ucsc. edu/research/compbio/sam.html. rph@cse.ucsc.edu

Developing curriculum in nursing informatics in Europe

The NIGHTINGALE Project (NIGHTINGALE Project: HC1109 DGXIII Contract and Technical Annex, European Commission, December 1995) which started on the 1st of January, 1996, after the approval of the European Commission, has a 36 month duration. It is essential in planning and implementing a strategy in training the nursing profession in using and applying healthcare information systems. NIGHTINGALE contributes towards the appropriate use of the developed telematics infrastructure across Europe by educating and training nurses in a harmonious way across Europe in the upcoming field of nursing informatics. NIGHTINGALE develops courseware material based on the curriculum development process using multimedia technologies. Computer based training software packages in nursing informatics will be the basis of the training material and the corresponding courses. CD-ROM based training and reference material will also be provided in the courses whereas the traditional booklets, teaching material and textbooks can also play an adequate role in training. NIGHTINGALE will disseminate all information and courseware material freely to all interested parties through the publications of the proceedings of the conferences, through the establishment of the world wide web (WWW) server in nursing informatics for Europe (http://www.dn.uoa.gr/nightingale), which will become a depository of nursing information knowledge across Europe as well as a dissemination node of nursing informatics throughout the European members states for the benefit and welfare of the European citizen.