• Title/Summary/Keyword: Search Systems

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Has Retrieval Technology in Vertical Site Search Systems Improved over the Years? A Holistic Evaluation for Real Web Systems

  • Mandl, Thomas;Womser-Hacker, Christa;Gatzke, Natalia
    • Journal of Information Science Theory and Practice
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    • v.3 no.4
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    • pp.19-34
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    • 2015
  • Evaluation of retrieval systems is mostly limited to laboratory settings and rarely considers changes of performance over time. This article presents an evaluation of retrieval systems for internal Web site search systems between the years 2006 and 2011. A holistic evaluation methodology for real Web sites was developed which includes tests for functionality, search quality, and user interaction. Among other sites, one set of 20 Web site search systems was evaluated three times in different years and no substantial improvement could be shown. It is surprising that the communication between site and user still leads to very poor results in many cases. Overall, the quality of these search systems could be improved, and several areas for improvement are apparent from our evaluation. For a comparison, Google’s site search function was also tested with the same tasks.

Consideration of a Robust Search Methodology that could be used in Full-Text Information Retrieval Systems (퍼지 논리를 이용한 사용자 중심적인 Full-Text 검색방법에 관한 연구)

  • Lee, Won-Bu
    • Asia pacific journal of information systems
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    • v.1 no.1
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    • pp.87-101
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    • 1991
  • The primary purpose of this study was to investigate a robust search methodology that could be used in full-text information retrieval systems. A robust search methodology is one that can be easily used by a variety of users (particularly naive users) and it will give them comparable search performance regardless of their different expertise or interests In order to develop a possibly robust search methodology, a fully functional prototype of a fuzzy knowledge based information retrieval system was developed. Also, an experiment that used this prototype information retreival system was designed to investigate the performance of that search methodology over a small exploratory sample of user queries To probe the relatonships between the possibly robust search performance and the query organization using fuzzy inference logic, the search performance of a shallow query structure was analyzes. Consequently the following several noteworthy findings were obtained: 1) the hierachical(tree type) query structure might be a better query organization than the linear type query structure 2) comparing with the complex tree query structure, the simple tree query structure that has at most three levels of query might provide better search performance 3) the fuzzy search methodology that employs a proper levels of cut-off value might provide more efficient search performance than the boolean search methodology. Even though findings could not be statistically verified because the experiments were done using a single replication, it is worth noting however, that the research findings provided valuable information for developing a possibly robust search methodology in full-text information retrieval.

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A Survey of Information Searches on Internet (인터넷에서 정보 탐색에 대한 연구 조사)

  • 강병주;백혜승;최기선
    • Proceedings of the Korean Society for Information Management Conference
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    • 1997.08a
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    • pp.37-53
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    • 1997
  • The huge size of Internet does not allow ordinary information seekers to search information with ease. Now, it is almost impossible to navigate the ocean of information without effective search tools. Web search engine has been the most effective technology for information retrieval on WWW. But recently, the need for new search tools on WWW or Internet has increased drastically. Currently, there are many on-going researches on the related topics. In this survey, we categorize the new search tools into four types: monitoring systems, filtering systems, browsing assistant systems, recommending systems. These example systems are examined. We are especially interested in WWW information filtering. It is studied how to apply the information filtering techniques to WWW, The application is not so straightforward like Email, Newswire filtering systems. As a result of this study, a simple WWW information filtering system is proposed.

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Loss Minimization In Distribution Systems Using Reactive Tabu Search (Reactive Tabu Search 알고리즘을 이용한 배전계통의 손실 최소화)

  • 최상열;장경일;신명철
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.17 no.5
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    • pp.80-87
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    • 2003
  • Network reconfiguration in distribution systems is realized by changing the status of sectiona1izing switches, and is usually done for loss minimization or load balancing in the system This parer presents an approach for loss minization in distribution systems using reactive tabu search. Tabu search attempts to determine a better solution in the manner of a greatest-descent algorithm, but it can not give any guarantee for the convergence property. Reactive tabu search can give convergence property by using reaction and escape mechanism. Therefore, it can find global optimal solution regardless of initial system configuration. To demonstrate the validity of the proposed algorithm, numerical calculations are carried out the 32 bus system models.

A modified tabu search for redundancy allocation problem of complex systems of ships

  • Kim, Jae-Hwan;Jang, Kil-Woong
    • Journal of Advanced Marine Engineering and Technology
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    • v.38 no.2
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    • pp.225-232
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    • 2014
  • The traditional RAP (Redundancy Allocation Problem) of complex systems has considered only the redundancy of subsystem with homogeneous components. In this paper we extend it as a RAP of complex systems with heterogeneous components which is more flexible than the case of homogeneous components. We model this problem as a nonlinear integer programming problem, find its optimal solution by tabu search, and suggest an example of the efficient reliability design with heterogeneous components. In order to improve the quality of the solution of the tabu search, we suggest a modified tabu search to employ an adaptive procedure (1-opt or 2-opt exchange) to generate the efficient neighborhood solutions. Computational results show that our modified procedure obtains better solutions as the size of problem increases from 30 to 50, even though it requires rather more computing time. With some adjustment of the parameters of the proposed method, it can be applied to the optimal reliability designs of complex systems of ships.

Heuristic Search in Overcurrent Protection Coordination of Power Distribution Systems (경험적 탐색에 의한 배전계통 보호기기 정정협조)

  • 이승재;박영문;이정원
    • The Transactions of the Korean Institute of Electrical Engineers
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    • v.40 no.2
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    • pp.135-143
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    • 1991
  • The setting problem of protective devices in power distribution systems is a combinatorial search problem involving a lot of trial & errors to search for a proper solution which has a great impact for the system reliability. This paper discusses the nature of the problem and proposes a scheme to prune the decision tree achieving the efficient search for a setting solution by applying heuristic rules which utilize pattern informations of backup and primary devices. Its effectiveness is demonstrated through many tests on real systems.

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A Suitable Cell Search Algorithm Using Separated I/Q Channel Cell Specific Scrambling Codes for Systems with Coexisting Cellular and Hot-Spot Cells in Broadband OFCDM Systems (광대역 OFCDM 시스템에서 셀룰러와 핫-스팟 셀들이 공존할 때 분리 I/Q채널 CSSC를 이용한 셀 탐색 알고리즘)

  • Kim Dae-Yong;Kwon Hyeog-Soong
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.9 no.8
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    • pp.1649-1655
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    • 2005
  • For systems with coexisting cellular and hot-spot cells in broadband orhogonal frequency and code division multiplexing (OFCDM) systems, a suitable cell search algorithm is proposed fur the common pilot channel (CPICH) in the forward link using separated I/Q channel cell specific codes(CSSC), in which the cellular cell specific scrambling code (CCSSC) is assigned to the in-phase (Q) pilot channel of all cellular cells, and the exclusive hot-spot cell specific scrambling code (HSCSSC) group is assigned to the quadrature (Q) pilot channel of all hot-spot cells. Therefore, the proposed algorithm enables a mobile station (MS) to search quickly for the most desirable hot-spot cell due to reducing the effect of CCSSC, when a MS wants to use a mobile internet. The computer simulation results show that the proposed cell search algorithm can achieve faster cell search time performance, compared to conventional cell search methods.

Locality-Sensitive Hashing Techniques for Nearest Neighbor Search

  • Lee, Keon Myung
    • International Journal of Fuzzy Logic and Intelligent Systems
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    • v.12 no.4
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    • pp.300-307
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    • 2012
  • When the volume of data grows big, some simple tasks could become a significant concern. Nearest neighbor search is such a task which finds from a data set the k nearest data points to queries. Locality-sensitive hashing techniques have been developed for approximate but fast nearest neighbor search. This paper introduces the notion of locality-sensitive hashing and surveys the locality-sensitive hashing techniques. It categories them based on several criteria, presents their characteristics, and compares their performance.

Factors Associated with Job Search Self-Efficacy of Unemployed Youth based on the Neuman Systems Model (청년구직자의 구직효능감에 영향을 미치는 요인 : Neuman의 Systems Model을 기반으로)

  • Park, Mijeong;Oh, Doonam
    • The Journal of the Korea Contents Association
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    • v.21 no.2
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    • pp.301-314
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    • 2021
  • Youth unemployment is a global social issue which leads to a waste of human resources and undermines the national economy. Job search self-efficacy (JSSE) can predict active job search and job search outcomes. The present study identified the factors affecting the JSSE of unemployed youth based on the Neuman Systems Model (NSM). The results indicated that job search period, job search stress, and problem-centred coping ability influenced young job seekers' JSSE, which increased especially with the perception of physical health. Therefore, to promote JSSE, it is necessary to not only establish social systems for the youth but also develop an intervention plan based on the NSM that optimises problem-centred coping ability, a normal line of defence in the individual's system, and maintains a healthy physical state, a line of resistance.

User Satisfaction Analysis on Similarity-based Inference Insect Search Method in u-Learning Insect Observation using Smart Phone (스마트폰을 이용한 유러닝 곤충관찰학습에 있어서 유사곤충 추론검색기법의 사용자 만족도 분석)

  • Jun, Eung Sup
    • Journal of the Korea Society of Computer and Information
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    • v.19 no.1
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    • pp.203-213
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    • 2014
  • In this study, we proposed a new model with ISOIA (Insect Search by Observation based on Insect Appearance) method based on observation by insect appearance to improve user satisfaction, and compared it with the ISBC and ISOBC methods. In order to test these three insect search systems with AHP method, we derived three evaluation criteria for user satisfaction and three sub-evaluation criteria by evaluation criterion. In the ecological environment, non-experts need insect search systems to identify insect species and to get u-Learning contents related to the insects. To assist the public the non-experts, ISBC (Insect Search by Biological Classification) method based on biological classification to search insects and ISOBC (Insect Search by Observation based on Biological Classification) method based on the inference that identifies the observed insect through observation according to biological classification have been provided. In the test results, we found the order of priorities was ISOIA, ISOBC, and ISBC. It shows that the ISOIA system proposed in this study is superior in usage and quality compared with the previous insect search systems.