Titlebook: Information Retrieval: A Health Care Perspective; William R. Hersh Book 19961st edition Springer Science+Business Media New York 1996 desi

adumbrate

1431-1909 ms and for knowledgeable people to design, purchase, and use them also increases. Although a number of books have been devoted to the mechanics of on-line searching and the structure of general retrieval systems, no book has addressed the specific needs and concerns of health care information retrie

Polydipsia

Terms, Models, and Resources of any type from a computer. However, to those working in the field, it has a different and more specific meaning: the retrieval of information from textual databases. It is a field at the intersection of information science and computer science, which concerns itself with the indexing and retrieva

合乎习俗

Health Informationng into the details of IR systems, however, it is worthwhile to step back and consider the more fundamental aspects of information, especially as it is used in the health care domain. In this chapter, the topic of information itself is explored, with particular attention to what it consists of and h

展览

Mammal

Databasesexhaustive list of electronic databases available for the health care field. Such a task is not feasible for a textbook, because databases undergo constant change, not to mention occasional disappearance. There are several resources, updated annually or more frequently, that catalog on-line database

Nefarious

Indexing The first is to represent the content of individual documents for searchers to retrieve them, and the second is to organize the content so that computer programs may determine rapidly which documents contain content about which concepts.

谷物

Retrievalhapter 5 showed how they are indexed for optimal retrieval. This chapter explores the interaction of the information retrieval (IR) system with the person whom it is intended to serve, the searcher. The entire retrieval process, from search formulation to system interaction to document delivery, is

Benign

Evaluationow they are accessed. This chapter focuses on the evaluation of these databases. It builds on the research principles introduced in Chapter 3, obtaining an overview of how well current systems perform as well as providing baseline data for assessing the various research systems and approaches discus

neologism

渐强

Linguistic Systemsrned to another major area of information retrieval (IR) research, the application of linguistic methods. These methods are based on techniques called . (NLP), which derive from the field of .. The chapter begins with an overview of language and computational linguistics. The focus then turns to NLP