• 한국멀티미디어학회논문지
• /
• 제13권12호
• /
• pp.1843-1854
• /
• 2010

The utilization of underground space has recently increased with the complication of road, the rise of the land price, and the development of green technology. Underground space ranges from classical excavations to subway, underground cities, and shopping malls where there are crowds of people. At this time, government has spent a lot of money in installing various types of safety facilities for preparations of increasing potential disasters. Therefore, an effective facility management system is required. In this paper, we propose an information retrieval process to effectively extract the facilities' information based on the ontology and spatial analysis in underground space. The ontology-based searching supports hierarchical and associated results as well as knowledge sharing with hierarchy concepts. The spatial analysis based searching has "Buffer" and "Near" functions to operate on a map without understanding any property of the facility information.

• 산업공학
• /
• 제6권2호
• /
• pp.3-17
• /
• 1993

Traditionally, programs for NC machine tools have been created using either a maunual method or a computer-assisted method. However, both methods are known to be complex, time-consuming and error-prone. This paper presents an intelligent system, called "INPPC" which is interfaced with a CAD system to generate APT NC part program automatically. The INPPC is developed by using VP-Expert rule-based expert system development tool, and obtains the information about the part shape by searching the CAD database, about the process by asking the related questions to the user, and about the machine tooling by searching the tool database. The INPPC is implemented on an IBM compatible PC/AT under MS-DOS, and its performance is demonstrated by consulting a simple example problem.

• 정보관리연구
• /
• 제24권4호
• /
• pp.43-57
• /
• 1993

본 논문은 인공지능(artificial intelligence) 및 전문가 시스템(expert system)의 기본 개념과 이에 적용되고 있는 특정한 기술인 퍼지 이론(fuzzy logic)을 논하고 있으며, 지난 몇 년 동안 탐색 중개인으로서의 전문가 시스템을 조사해 보았다. 이러한 전문가 시스템은 1) 특정한 데이터베이스에 관련된 질문서 작성을 도와주며, 2) 탐색용어나 데이터베이스 선정에 관한 결정을 보조하고, 3) 탐색중에 있는 이용자에게 조언(助言)을 해주고 있다. 또한 전문가 시스템을 개발하는 에 있어 어려움 및 제한점(制限點)을 논의하고 있다.

• 전자공학회논문지T
• /
• 제35T권3호
• /
• pp.15-24
• /
• 1998

본 논문에서는 Barnsley가 제안한 반복 함수 체계(IFS)에 근거한 새로운 영상 압축 기술인 프랙탈 영상 부호화의 성능 개선 방법을 제시한다. 기존의 완전 탐색을 이용한 프랙탈 부호화 방법은 영상의 복원 화질이 다른 프랙탈 기법에 비해 좋은 결과를 얻을 수 있지만 탐색시간이 지나치게 오래 걸리고, 선형 유사 변환을 통하여 블록의 근사화를 수행하므로 복잡한 블록의 근사화가 어렵다는 단점이 있다. 따라서 본 논문에서는 쿼드 트리 분할을 사용하여 코딩 블록의 크기를 가변적으로 설정하도록 하여 복잡한 블록은 크기가 작은 블록으로 단순한 블록은 큰 블록으로 분할되도록 하였다. 이렇게 함으로써 블록의 근사화 정도도 높이고 변환의 수도 줄여 압축률의 개선을 가져왔다. 또한, 탐색 영역을 제한하여 부호화 시간이 짧으면서도 기존의 완전 탐색(full searching) 방법에 비하여 탐색 시간을 줄였으며 복원 영상의 주관적 평가의 화질은 더 우수했다. 그리고 매칭 블록의 탐색이 필요 없는 Monro 방법에 비해 부호화 시간이 다소 느리기는 하지만 화질 면에서 월등한 성능을 보였다.

• 한국전자거래학회지
• /
• 제1권1호
• /
• pp.195-207
• /
• 1996

It is required the electronic commerce system for satisfying the various information needs of user groups on the high speed communication networking. However, its information amounts will be explosive, and make it difficult for users to locate information they are interested in. Therefore we have developed the architecture of information searching platform for electronic commerce which searches and gathers information about electronic commerce site on internet and builds the keywords index database for serving the client's requests in order to provide non-professionals and small companies etc., with access easily to retrieval information.

• 한국정보과학회:학술대회논문집
• /
• 한국정보과학회 2003년도 가을 학술발표논문집 Vol.30 No.2 (2)
• /
• pp.751-753
• /
• 2003

약물의 화학구조와 약리작용간의 관계는 'Medicinal Chemistry'에서 활발히 연구된다. 이에 도움이 되는 분야로 수많은 약물들에서 사용자가 지정한 구조를 부분구조로 가지는 약물들을 자동으로 빠르게 찾아내는 부분구조검색(Substructure Searching)이 있다. 1950년대부터 연구된 앞의 문제는 NP-Complete이나 미리 인덱스를 두어 성능을 높인 RS3 시스템(http://www.acelrys.com/rs3)이 미국 특허를 받았다. 이 시스템은 화학구조에 대한 설명을 대용량으로 기술하여 이를 RDBMS에 저장하고 검색하는 시스템이다. 하지만 이 시스템은 재현율(Recall)과 정도(Precision)가 매우 낮으므로, 본 논문에서는 새로운 인덱스를 개발하여 재현율과 정도를 향상시킨 기법을 제시한다.

• 한국문헌정보학회지
• /
• 제26권
• /
• pp.167-185
• /
• 1994

The purpose of this study is to develop the optimal user/librarian interface in information searching. In order to achive the purpose, the 150 unskilled students as subjects have participated in the study. According to the change of the subjects' psychological information states by the access points within the library system, the subjects have been classified into the five types of model: the initial information state, the accepted identification information state, the bibliographic information state, the stack information state, and the location information state. Librarian's searching support is done for 10 minutes at the each access points. To develop the optimal user/librarian interface, the expected values of the models are calculated. The resultants are as follows: 1) The expected value of the initial information states model is 18.94: 2) The expected value of the accepted identification information model is 27.06: 3) The expected value of the bibliographic information state model is 27.06: 4) The expected value of the stack information state model is 22.38: 5) The expected value of the location information state model is 22.38. Those expected values are compared with each other. The model with the lowest expected value is chosen as the optimal user/librarian interface model. In the result, the user's initial information state model of the optimal user/librarian interface in information searching is developed. In order to search the information with the most effect, user must be interfaced with the librarian at his/her own initial information state.

• International Journal of Computer Science & Network Security
• /
• 제24권5호
• /
• pp.79-88
• /
• 2024

The information retrieval domain deals with the retrieval of unstructured data such as text documents. Searching documents is a main component of the modern information retrieval system. Locality Sensitive Hashing (LSH) is one of the most popular methods used in searching for documents in a high-dimensional space. The main benefit of LSH is its theoretical guarantee of query accuracy in a multi-dimensional space. More enhancement can be achieved to LSH by adding a bit to its steps. In this paper, a new Dynamic Locality Sensitive Hashing (DLSH) algorithm is proposed as an improved version of the LSH algorithm, which relies on employing the hierarchal selection of LSH parameters (number of bands, number of shingles, and number of permutation lists) based on the similarity achieved by the algorithm to optimize searching accuracy and increasing its score. Using several tampered file structures, the technique was applied, and the performance is evaluated. In some circumstances, the accuracy of matching with DLSH exceeds 95% with the optimal parameter value selected for the number of bands, the number of shingles, and the number of permutations lists of the DLSH algorithm. The result makes DLSH algorithm suitable to be applied in many critical applications that depend on accurate searching such as forensics technology.

• 수산해양교육연구
• /
• 제19권3호
• /
• pp.373-382
• /
• 2007

As the Internet users are growing, GIS researchers that would like to integrate various GIS informations have more interests for information searching technologies based on Web. But, even though these researches is growing a infinite possibility of utilizing the map, there are not yet providing more functionalized GIS services. This paper proposes a searching mechanism for the teacher information based on the SVG(Scalable Vector Graphics) format transformed the SHP format. We also implement the home-page link function inserted Web-connection information of the specific locations that could connect specific school web site within SVG file. We also provide the services to interpret requested query with proposed scheme.

• Journal of Electrical Engineering and Technology
• /
• 제8권3호
• /
• pp.464-471
• /
• 2013

This paper proposes a hybrid searching algorithm based on parameter identification for power system load models. Hybrid searching was performed by the combination of particle swarm optimization (PSO) and a complex method, which enhances the convergence of solutions closer to minima and takes advantage of global searching with PSO. In this paper, the load model of interest is composed of a ZIP model and a third-order model for induction motors for stability analysis, and parameter sets are obtained that best-fit the output measurement data using the hybrid search. The origin of the hybrid method is to further apply the complex method as a local search for finding better solutions using the selected particles from the performed PSO procedure.