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尹龜鎬 韓國圖書館學會 1981 圖書館學 Vol.8 No.1
Retrieval effectiveness in the principal criterion for measuring the performance of an information retrieval system. The effectiveness of a retrieval system depends primarily on the extent to which it can retrieve wanted documents without retrieving unwanted ones, So, ultimately, effectiveness is a function of the relevant and nonrelevant documents retrieved. Consequently, "relevance" of information to the user's request has become one of the most fundamental concept encountered in the theory of information retrieval. Although there is at present no consensus as to how this notion should be defined, relevance has been widely used as a meaningful quantity and an adequate criterion for measures of the evaluation of retrieval effectiveness. The recall and precision among various parameters based on the "two-by-two" table(or, contingency table) were major considerations in this paper, because it is assumed that recall and precision are sufficient for the measurement of effectiveness. Accordingly, different concepts of "relevance" and "pertinence" of documents to user requests and their proper usages were investigated even though the two terms have unfortunately been used rather loosely in the literature. In addition, a number of variables affecting the recall and precision values were discussed. Some conclusions derived from this study are as follows: Any notion of retrieval effectiveness is based on "relevance" which itself is extremely difficult to define. Recall and precision are valuable concepts in the study of any information retrieval system. They are, however, not the only criteria by which a system may be judged. The recall-precision curve represents the average performance of any given system, and this may vary quite considerably in particular situations. Therefore, it is possible to some extent to vary the indexing policy, the indexing policy, the indexing language, or the search methodology to improve the performance of the system in terms of recall and precision. The "inverse relationship" between average recall and precision could be accepted as the "fundamental law of retrieval", and it should certainly be used as an aid to evaluation. Finally, there is a limit to the performance(in terms of effectiveness) achievable by an information retrieval system. That is : "Perfect retrieval is impossible."
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윤귀호,김세원,박영,김종성,이보경 한국항해항만학회 2011 한국항해항만학회 학술대회논문집 Vol.2011 No.춘계
현재 2011년 10월 개통 목표인 경인 아라뱃길의 기반시설 공사에 일환인 영종대교 주변 수역에 선박 통항로가 재설정될 예정이다. 영종대교의 주변 수역에 설정될 통항로는 항로폭이 협소하고, 영종대교 주교각에 충돌방지공이 아직 설치되어 있지 않으며, 직선항로가 충분히 확보되어 있지 않은 상황에 있다. 이 연구에서는 영종대교 주교각에 충돌방지공이 설치완료되기 전까지 선박통항의 안전을 도모하기 위한 통항로의 통항 규칙 및 비상대응 매뉴얼을 제안하고자 한다.
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