Search (451 results, page 23 of 23)

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Date

20. 1.2015 18:30:22

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Footnote

Rez. in: JASIST 62(2011) no.12, S.2540-2543 (C. Leslie)

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Footnote

Rez. in: JASIST 62(2011) no.12, S.2504-2543 (C. Leslie)

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Editor

Wellman, B. u. C. Haythornthwaite

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Footnote

Relational database Management systems have been one of the great success stories of recent times and sensitive to the market, Most major vendors have responded by extending their products to handle XML data while still exploiting the range of facilities that a modern RDBMS affords. No book of this type would be complete without consideration of the "big these" (Oracle 9i, DB2, and SQL Server 2000 which each get a dedicated chapter) and though occasionally overtly piece-meal and descriptive the authors all note the shortcomings as well as the strengths of the respective systems. This part of the book is somewhat dichotomous, these chapters being followed by two that propose detailed solutions to somewhat theoretical problems, a generic architecture for storing XML in a RDBMS and using an object-relational approach to building an XML repository. The biography of the author of the latter (Paul Brown) contains the curious but strangely reassuring admission that "he remains puzzled by XML." The first five components are in-depth case studies of XMLdatabase applications. Necessarily diverse, few will be interested in all the topics presented but I was particularly interested in the first case study an bioinformatics. One of the twentieth century's greatest scientific undertakings was the Human Genome Project, the quest to list the information encoded by the sequence of DNA that makes up our genes and which has been referred to as "a paradigm for information Management in the life sciences" (Pearson & Soll, 1991). After a brief introduction to molecular biology to give the background to the information management problems, the authors turn to the use of XML in bioinformatics. Some of the data are hierarchical (e.g., the Linnaean classification of a human as a primate, primates as mammals, mammals are all vertebrates, etc.) but others are far more difficult to model. The Human Genome Project is virtually complete as far as the data acquisition phase is concerned and the immense volume of genome sequence data is no longer a very significant information Management issue per se. However bioinformaticians now need to interpret this information. Some data are relatively straightforward, e.g., the positioning of genes and sequence elements (e.g., promoters) within the sequences, but there is often little or no knowledge available an the direct and indirect interactions between them. There are vast numbers of such interrelationships; many complex data types and novel ones are constantly emerging, necessitating an extensible approach and the ability to manage semi-structured data. In the past, object databases such as AceDB (Durbin & Mieg, 1991) have gone some way to Meeting these aims but it is the combination of XML and databases that more completely addresses knowledge Management requirements of bioinformatics. XML is being enthusiastically adopted with a plethora of XML markup standards being developed, as authors Direen and Jones note "The unprecedented degree and flexibility of XML in terms of its ability to capture information is what makes it ideal for knowledge Management and for use in bioinformatics."
After several detailed examples of XML, Direen and Jones discuss sequence comparisons. The ability to create scored comparisons by such techniques as sequence alignment is fundamental to bioinformatics. For example, the function of a gene product may be inferred from similarity with a gene of known function but originating from a different organism and any information modeling method must facilitate such comparisons. One such comparison tool, BLAST utilizes a heuristic method has become the tool of choice for many years and is integrated into the NeoCore XMS (XML Management System) described herein. Any set of sequences that can be identified using an XPath query may thus become the targets of an embedded search. Again examples are given, though a BLASTp (protein) search is labeled as being BLASTn (nucleotide sequence) in one of them. Some variants of BLAST are computationally intensive, e.g., tBLASTx where a nucleotide sequence is dynamically translated in all six reading frames and compared against similarly translated database sequences. Though these variants are implemented in NeoCore XMS, it would be interesting to see runtimes for such comparisons. Obviously the utility of this and the other four quite specific examples will depend an your interest in the application area but two that are more research-oriented and general follow them. These chapters (on using XML with inductive databases and an XML warehouses) are both readable critical reviews of their respective subject areas. For those involved in the implementation of performance-critical applications an examination of benchmark results is mandatory, however very few would examine the benchmark tests themselves. The picture that emerges from this section is that no single set is comprehensive and that some functionalities are not addressed by any available benchmark. As always, there is no Substitute for an intimate knowledge of your data and how it is used. In a direct comparison of an XML-enabled and a native XML database system (unfortunately neither is named), the authors conclude that though the native system has the edge in handling large documents this comes at the expense of increasing index and data file size. The need to use legacy data and software will certainly favor the all-pervasive XML-enabled RDBMS such as Oracle 9i and IBM's DB2. Of more general utility is the chapter by Schmauch and Fellhauer comparing the approaches used by database systems for the storing of XML documents. Many of the limitations of current XML-handling systems may be traced to problems caused by the semi-structured nature of the documents and while the authors have no panacea, the chapter forms a useful discussion of the issues and even raises the ugly prospect that a return to the drawing board may be unavoidable. The book concludes with an appraisal of the current status of XML by the editors that perhaps focuses a little too little an the database side but overall I believe this book to be very useful indeed. Some of the indexing is a little idiosyncratic, for example some tags used in the examples are indexed (perhaps a separate examples index would be better) and Ron Bourret's excellent web site might be better placed under "Bourret" rather than under "Ron" but this doesn't really detract from the book's qualities. The broad spectrum and careful balance of theory and practice is a combination that both database and XML professionals will find valuable."

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Footnote

Rez. in: JASIST 56(2005) no.10, S.1127-1128 (C. Tomer): "This book mixes assessments of how information technology influences the quality of everyday life with analyses of how technological life is portrayed in contemporary films and science fiction novels. What is more important, Connected is based an the idea that contemporary science fiction is the only medium radical enough in its perspectives to provide us with genuinely useful insights into the social upheaval that has been induced by the advances of the Internet and the World Wide Web into everyday life. It is an interesting, but ultimately preposterous concept, because it asks us to believe that we can actually come to understand the world around us by assimilating the largely hallucinogenic views of the novelists about whom Shaviro writes. How other readers react to this notion will probably depend an how seriously they take science fiction, their tolerance for post-modern literary and social deconstruction, the legacies of the Beats and Timothy Leary, and how plastic their attitudes toward the constitution of credible theory are. Discriminating readers, as well as those of lesser forbearance, will most likely turn elsewhere for insights into the meaning of life in "the network society," opting instead for merely mediocre books such as Howard Rheingold's Smart Mobs. So, what is wrong with Connected? The first problem is that Connected is a disioint, often confusing collection of short essays and observations that eschews a more straightforward approach to narrative and thematic development in pursuit of hypertextual effects. The affectation does not serve the book well. The "jumpiness" of the narrative and the attendant discontinuities tend to weaken Shaviro's main thesis. But it is important to note, too, that the style and tone that Shaviro uses in his essays will be familiar to many readers, because it resembles the style and tone of many of the blogs that have become such an important part of the landscape of the World Wide Web.

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Classification

303.48/33 22 (LoC)

DDC

303.48/33 22 (LoC)

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Date

22. 3.2004 14:46:50

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Footnote

The real core of the SRVP, that is, the VRT training activities actually utilized by Washington State, are presented in Chapter Seven in roughly the same order as they took place in the course (train the trainer, orientation, chat practice, multitasking skills, virtual field trips, secret patron, transcript review, checking out the competition, policy and procedure review, sharing via a discussion list, and online meetings). Most interestingly, Chapter Eight deals with behavior, an issue rarely discussed in the context of librarianship, let alone providing reference services. As stated by the authors, "the most difficult aspect of digital reference service involves incorporating model reference interview techniques into an online transaction" (p. 74). The SVRP utilized an "online secret patron scenario" as a training tool that helped the student get the question straight, kept the customer informed, and provided the information required by the patron. The final chapter of the book reviews the important tasks of evaluation, modification, and follow-up. To that end, evaluative material is described and linked to Appendix A (assessment tools). In addition, evaluative tasks such as trainer debriefings and consultation with others participating in the SVRP are described. Finally, the chapter includes examples of unexpected consequences experienced in evaluating VRT services (from total inability to handle online transactions to poor marketing or branding of online services). Many useful appendices are included in this book. Appendix A provides examples of several assessment tools used during the "Anytime, Anywhere Answers" program. Appendix B consists of actual transcripts (edited) designed to illustrate good and bad virtual reference transactions. The transcripts illustrate transactions involving helping with homework, source citing, providing an opinion, suggesting print materials, and clarifying a question. This appendix should be required reading as it provides real-world examples of VRT in action. Appendix C is a copy of a VRT field trip questionnaire. The next appendix, like Appendix B, should be required reading as it includes an actual transcript from seven secret patron scenarios. A policies and procedures checklist is provided in Appendix E. Yet another critical source of information is presented in Appendix F, online meeting transcript. This transcript is the result of an online meeting conducted during a VRSP training class held in 2003. According to the authors, it is an example of the positive working relationship developed during a five-week learning course. The remaining appendices (G through 1) present information about support materials used in the VSRP, the VSRP budget, and trainer notes and tips. Clearly, VRT is a skill and resource that information professionals need to embrace, and this book does a fine job of outlining the essentials. It is apparent that the Washington State experience with VRT was a pioneering venture and is a model that other information professionals may seek to embrace, if not emulate, in developing their own VRT programs. However, this book is not a "complete guide" to VRT. There is too rapid development in virtual environments for any one to claim such an achievement. However, it is likely the most "complete" guide to the Washington State experience that will be published; therefore, this book should serve as a thorough and revelatory guide to VRT for several years to come."