Faculty Profiles - OHTA Manabu

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Meta Search Engine Using Hierarchical Clustering : METAL

NARITA Hirokazu, OHTA Manabu, KATAYAMA Kaoru, ISHIKAWA Hiroshi

IEICE technical report. Data engineering 102 ( 209 ) 1 - 6 2002.7

Language：Japanese Publisher：The Institute of Electronics, Information and Communication Engineers

It is search engines represented by google, goo, Lycos, and so on that shoulders a leading role as an access means to the necessary information on the Web. A lot of maintenance, such as collection of new Web pages and renewal check, is necessary for these search engines to cope with the Web changing continually. On the other hand, sometimes, it is difficult to find necessary information because of enormous search results. One search engine may be able to find what another can't because different search engines collect different kinds of information. In this paper, we propose a meta search engine which uses more than one search engine at the same time for improving recall, and cluster search results for supporting users to find their necessary information more easily.

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A proposal of modified P2P network using query history : Application to the safety information retrieval

NAKAYAMA Junya, OHTA Manabu, KATAYAMA Kaoru, ISHIKAWA Hiroshi

IEICE technical report. Data engineering 102 ( 208 ) 161 - 166 2002.7

Language：Japanese Publisher：The Institute of Electronics, Information and Communication Engineers

To improve performance of retrieval, we propose a modified Peer-to-Peer (P2P) protocol where the query history is used for safety information retrieval. A centralized system such as the phone network does not resist the overload due to disasters, but a distributed system such as P2P is more robust. To be relevant, safety information should be up-to-date; this is why we chose the Pure-P2P system. However, retrieval on the Pure-P2P network is not efficient because repeated broadcasting increases network load. We propose to reduce an approach to the load by finding the closest nodes to data from information retrieval on query history.

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An end -user- oriented XML query method

YOKOYAMA Shohei, OHTA Manabu, ISHIKAWA Hiroshi

IPSJ SIG Notes 2001 ( 70 ) 413 - 420 2001.7

Language：Japanese Publisher：Information Processing Society of Japan (IPSJ)

The form of XML data has spread quickly in the distributed environment of the Internet. Therefore, a query language is required which can flexibly handle XML data distributed over various sites. At the same time, many data sources have been utilized through Web-Interfaces, which recent search engines or shopping sites usually have. Accordingly, it is essential that end users who don't have much expertise can query data sources. In this paper, we propose a query language "Quiz" . Then we also illustrate that its query processing is simplified by using Three-tier architecture model in which we use XHTML as presentation layer, server side scripts as web server layer, and "Quiz" as data layer.

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Other Link： http://id.nii.ac.jp/1001/00019617/

An end-user-oriented XML query method

YOKOYAMA Shohei, OHTA Manabu, ISHIKAWA Hiroshi

IEICE technical report. Data engineering 101 ( 192 ) 245 - 252 2001.7

Language：Japanese Publisher：The Institute of Electronics, Information and Communication Engineers

The form of XML data has spread quickly in the distributed environment of the Internet. Therefore, a query language is required which can flexibly handle XML data distributed over various sites. At the same time, many data sources have been utilized through Web-Interfaces, which recent search engines or shopping sites usually have. Accordingly, it is essential that end users who don't have much expertise can query data sources. In this paper, we propose a query language "Quiz". Then we also illustrate that its query processing is simplified by using Three-tier architecture model in which we use XHTML as presentation layer, server side scripts as web server layer, and "Quiz" as data layer.

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A Specification Language of XML - Based e - Business Models

ISHIKAWA Hiroshi, OHTA Manabu

IPSJ SIG Notes 2000 ( 69 ) 439 - 446 2000.7

Language：Japanese Publisher：Information Processing Society of Japan (IPSJ)

Electronic Commerce(EC)business models like e-brokers on the Internet use a large number of XML data such as product and customer data. To flexibly model such applications, we need a modeling language for EC businesses, specifically, business processes. First, as business process specification, we must allow users to retrieve only necessary portions of XML data centric in business models by specifying flexible search conditions. Second, we must allow users to combine XML data from different sources to produce new XML data for EC services. To this end, we have adopted a query language approach to modeling and have designed a query language for XML, suitable for supporting EC business models. In this paper, we discuss the needs for an XML query language for supporting EC business models and explain its functionality and validate its usability by specifying e-broker business models. We also discuss its applicability to other business modesl.

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Other Link： http://id.nii.ac.jp/1001/00019715/

A Specification Language of XML-Based e-Business Models

ISHIKAWA Hiroshi, OHTA Manabu

IEICE technical report. Data engineering 100 ( 228 ) 63 - 70 2000.7

Language：English Publisher：The Institute of Electronics, Information and Communication Engineers

Electronic Commerce(EC) business models like e-brokers on the Internet use a large number of XML data such as product and customer data. To flexibly model such applications, we need a modeling language for EC businesses, specifically, business processes. First, as business process specification, we must allow users to retrieve only necessary portions of XML data centric in business models by specifying flexible search conditions. Second, we must allow users to combine XML data from different sources to produce new XML data for EC services. To this end, we have adopted a query language approach to modeling and have designed a query language for XML, suitable for supporting EC business models. In this paper, we discuss the needs for an XML query language for supporting EC business models and explain its functionality and validate its usability by specifying e-broker business models. We also discuss its applicability to other business models.

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Applying HMM to fuzzy English-text retrieval

59 109 - 110 1999.9

How to Learn OCR's Misrecognitions

57 41 - 42 1998.10

Reduction of Expanded Search Terms for Fuzzy English-text Retrieval

OHTA Manabu, TAKASU Atsuhiro, ADACHI Jun

IEICE technical report. Data engineering 98 ( 42 ) 63 - 70 1998.5

Language：Japanese Publisher：The Institute of Electronics, Information and Communication Engineers

OSR misrecognition is a serious problem where OCR-recognized text is used for retrieval purpose in digital libraries. We have proposed fuzzy retrieval methods which assume that errors remain in the recognized text, without correcting errors manually from a cost standpoint. The proposed methods generate multiple search terms for an input query term by referring to the confusion matrices which store all characters likely to be misrecognized and the respective probability of each misrecognition. The proposed methods can improve recall rate without decreasing precision rate but occasionally generate a few million search terms in English fuzzy retrieval, which is a bottleneck for retrieval speed. Therefore this paper presents a method to reduce the number of the generated search terms with keeping sufficient retrieval effectiveness by restricting the number of errors included in the expanded search terms.

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Retrieval Methods for Text with Missrecognized Characters

Ohta Manabu, Takasu Atsuhiro, Adachi Jun

Research bulletin of the National Center for Science Information System 9 ( 9 ) 161 - 172 1997.3

Language：Japanese Publisher：National Institute of Informatics

This paper presents three probabilistic text retrieval methods designed to carry out a full-text search of Japanese documents containing OCR errors. By searching for any query term on the premise that there are errors in the recognized text, the methods presented can tolerate such errors, and therefore manual post-editing is not required after OCR recognition. In the applied approach, confusion matrices are used to store characters which are likely to be interchanged when a particular character is missrecognized, and the respective probability of each occurrence. Moreover, a 2-gram matrix is used to store probabilities of character connection based on 2-gram statistics, i.e., which letter is likely to come after another. Multiple search terms are generated for an input query term by making reference to confusion matrices, after which a full-text search is run for each search term. The validity of retrieved terms is determined based on error-occurrence and character-connection probabilities. Those with a validity value greater than a given threshold are judged to satisfy the input query. In addition, the performance of these methods is experimentally evaluated by determining retrieval effectiveness, i.e., by calculating recall and precision rates. Results indicate marked improvement in comparison with exact matching.

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Statistical Approach to Text Retrieval containing Miss Recognized Characters

52 211 - 212 1996.3

A Retrieving Method for the Text Containing Miss-Recognized Characters

51 247 - 248 1995.9

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