• Journal of the Korea Institute of Information Security & Cryptology
• /
• v.30 no.3
• /
• pp.405-415
• /
• 2020

With the increase in smartphone user, mobile forensics has become an essential element in modern digital forensic investigation. Mobile messenger data is very important data in mobile forensics because it can acquire information such as user's life pattern and mental state. In order to analyze messenger data, a decryption technique of an encrypted messenger data is required. Since most messengers provide a message deleting function, a technique for recovering deleted messages is required. WeChat Messenger, a messenger used by about 1 billion people around the world, uses IMEI (International Mobile Equipment Identity) information to encrypt data and provides message deletion function. In this paper, we propose a data decryption method in the absence of IMEI information and propose a method for recovering deleted messages using FTS (Full Text Search) database created for full-text search function of SQLite database.

• Proceedings of the Zoological Society Korea Conference
• /
• 1999.04a
• /
• pp.33-33
• /
• 1999

No Abstract, See Full Text

• Journal of the Korean Society for Library and Information Science
• /
• v.32 no.1
• /
• pp.129-154
• /
• 1998

In these days the online full-text database are increasing, but conventional full-text information retrieval system has been proved with high recall ratio and low precision ratio. One of the disadvantages of full-text IR system is that it is not designed to reflect the user's information need it is due to the fact that full-text IR system has been designed based on physical and logical structure of document without considering the content of document. Therefore, the purpose of the study examined feasibility of document content structure in full-text IR system by resolving such disadvantages of conventional system. 180 Journal articles have been analyzed to find common structure of document content and finally general model of the structure of journal articles were developed. The result shows that have relation to between user's cogntive schema structure, user's information need and contents structure of document. Thus it is concluded that full-text IR system need to be designed by using document content structure in order to meet user's information need more effectively.

• Proceedings of the Korean Information Science Society Conference
• /
• 1999.10a
• /
• pp.153-155
• /
• 1999

1990년대 중반부터 인터넷의 활성화와 다양하고 강력한 문서편집기의 보편화에 따라 복잡한 문서들이 대량으로 생산됨에 따라 인터넷을 통한 효율적인 문서교환의 필요성이 늘어나고 있다. 그러나 생산된 방대한 양의 전자형태 복합문서들은 ？글, MS-Word, LaTex 등 다양한 문서편집기로 작성되었고 문서형식의 표준화가 이루어지지 않아, 효율적으로 활용되지 못하고 특히 문서교환에 있어 많은 문제점을 야기하고 있는 실정이다. 본 논문에서는 다양한 형태로 존재하는 복합문서들을 하나의 통일된 중간포맷으로 변환하고, 변환된 복합문서들을 전문데이터베이스(full-text database)화하여 이를 인터넷을 통해 효율적으로 검색할 수 있는 전문검색시스템 모델을 제시한다.

• International Journal of Fuzzy Logic and Intelligent Systems
• /
• v.7 no.4
• /
• pp.274-278
• /
• 2007

As XML becomes the standard of digital data exchange format we need to manage a lot of XML data effectively. Unlike tables in relational model XML documents are not structural. That makes it difficult to store XML documents as tables in relational model. To solve these problems there have been significant researches in relational database systems. There are two kinds of approaches: 1) One way is to decompose XML documents so that elements of XML match fields of relational tables. 2) The other one stores a whole XML document as a field of relational table. In this paper we adopted the second approach to store XML documents because sometimes it is not easy for us to decompose XML documents and in some cases their element order in documents are very meaningful. We suggest an efficient table schema to store only inverted index as tables to retrieve required data from XML data fields of relational tables and shows SQL translations that correspond to XML full-text retrievals. The functionalities of XML retrieval are based on the W3C XQuery which includes full-text retrievals. In this paper we show the superiority of our method by comparing the performances in terms of a response time and a space to store inverted index. Experiments show our approach uses less space and shows faster response times.

• Bulletin of the Korean Space Science Society
• /
• 2000.04a
• /
• pp.15-15
• /
• 2000

No Abstract, See Full Text

• Bulletin of the Korean Space Science Society
• /
• 1995.04a
• /
• pp.23-23
• /
• 1995

No Abstract. See Full-text

• Proceedings of the Korean Society for Information Management Conference
• /
• 1995.08a
• /
• pp.55-58
• /
• 1995

본 논문은 문서를 기술하는 마크업 언어인 SGML의 개념과 SGML 응용 현황들을 고찰하고 우리 글로 된 전문데이터베이스 구축시 SGML을 이용하기 위하여 필요한 사항들을 제안하였다.

• Proceedings of the Zoological Society Korea Conference
• /
• 2001.04a
• /
• pp.52.1-52
• /
• 2001

No Abstract, See Full Text

• Journal of the Korea Academia-Industrial cooperation Society
• /
• v.17 no.6
• /
• pp.656-662
• /
• 2016

We have provided a variety of domestic construction technology related full-text services through the Construction Technology Digital Library system since 2001. CODIL is a system that services the database related to construction technology data. On the other hand, there is growing demand for DB every year, but the required budget is shrinking. Therefore, this study investigated the satisfaction to effectively service the construction technique-related full-text with a limited budget. The monetary value of full-text to express satisfaction with the quantified value was estimated using the Tobit model. The Tobit model is used as a contingent valuation method to estimate the value of non-market goods. This model is the limited dependent variable regression model to observations by censoring the limit of the left side or right side so that a biased outlier is not reflected in the willingness to pay. A survey was conducted by sampling 312 respondents. The mean, median, truncating the willingness of payment were calculated for the six types of the full-text services using the Tobit model. The statistically significant variables affecting the willingness to pay for the full-text services were identified. The mean value of per the full-text service was estimated to be 46,530 won. The significance of this study was to use the Tobit model to estimate the value of the construction technology-related full-text services for the first time in Korea.