• 지식경영연구
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• 제17권1호
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• pp.113-133
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• 2016

Why illegal digital contents sharing happens? This study pays attention to the fact that file sharing is an exchanging behavior between people and it is expanding despite of an illegal behavior and proposes that it is necessary for the phenomenon to be understood from social cultural point of view beyond a personal dimension. Based on the social exchange theory, this study demonstrates effects of file sharing attitudes and continuity, regarding 'group norm', 'popular demand', 'reciprocity' and 'social solidarity' as main factors. The main findings of this study are as followed;- First, it is shown that a tacit agreement of a group on file sharing is a determinant of positive attitude to file sharing and the intent of continual file sharing. Second, it is not found that the social relationship factors that are regarded as potential influential factors on file sharing attitude have effects on file sharing behavior, except for 'group norm'. Unlike previous studies, the results may come from the fact that this study deals with an illegal behavior. The third finding indicates a structural relationship between social relationship factors. When members of a group have more amicable attitude to file sharing including silence or a tacit agreement on file sharing, more people ask illegal sharing of files that they need. Such public demand creates expectation of reciprocity. As reciprocity maintains, social connectedness is strengthened. Then, strong social connectedness escalates the intent to maintain file sharing. It is important to notice that this study promotes understanding of how digital contents sharing happens by structuring and demonstrating influential relationship between characteristic factors of the social relationship.

• 디지털산업정보학회논문지
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• 제10권2호
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• pp.91-105
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• 2014

This paper proposes a digital forensic method by an evaluation function based on timestamp changing patterns. Operations on file or folder leave changed timestamps, which give the ways to know what operations were executed. Changes of timestamps of ten operations of a file and eight operations of a folder were examined. Analyses on the changes on the eight folder operations are newly added in this paper, which are not performed in the previous works. Based on the timestamps changes of the file and the folder, two evaluation functions are proposed. The first evaluation function checks whether timestamps are changed by file and folder operations, and the second evaluation function checks whether timestamps are originated from a source file or other attribute field. By the two output values from these evaluation functions, a digital forensic investigation on the file or the folder is performed. With some cases, i. e. file copy and folder creation operations, the proposed forensic method is tested for its usefulness.

• 디지털산업정보학회논문지
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• 제4권2호
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• pp.101-108
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• 2008

In this paper, we develop system to backup automatically personal data by real time based on ECA model. This system backups data that is changed in user PC using CDP technology based on ECA model. Proposed ECA model defines file's change such as file creation, update, remove etc. in user PC to event for synchronization between server and user PC. If event is detected about file, proposed system examines condition that is defined and backup the file to server. Backup data that is stored to server can recovery on point of time that user wants. The proposed system can be applied to data management system for business, personal data management system, high-capacity contents management system etc.

• 정보관리학회지
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• 제3권1호
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• pp.17-39
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• 1986

정보검색시스템에 대한 관심이 날로 증대하고 또 온라인 정보검색시스템의 발달로 이용자는 더욱 효과적이고 빠른 탐색을 기대하게 되었다. 여기서 중대한 문제의 하나가 파일조직방법의 선택이다. 본 논문에서는 파일조직방법이 검색성능에 영향을 미칠 것이라는 가설하에 여러가지 파일조직방법 충 도치파일과 클러스터파일을 선택하여 그에 따른 검색성능을 비교하였다.

• 융합정보논문지
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• 제9권1호
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• pp.142-150
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• 2019

본 연구는 블루투스 기반의 암호모듈을 활용하여 전산기 및 클라우드 데이터를 암 복호화하는 파일관리 보안시스템으로 개인정보의 오남용과 사회적, 국가적 정보보호 측면에서 반드시 필요한 솔루션이다. 클라우드 환경에서 SFMS(; Safe File Management Security) 관련 블루투스 암호모듈에 대한 H/W와 S/W를 개발하여 펌웨어 개발과 암호키 생성 및 발급, 시스템 모바일용 Client 프로그램, 키 관리 시스템 등을 적용하였다. 단말 내부 암 복호화는 파일별로 키값이 별도로 존재함으로 해킹 자체가 원천적으로 불가능 한 높은 안전성을 확보할 수 있는 SFMS 개발하였다.

• 정보학연구
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• 제10권3호
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• pp.59-75
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• 2007

Java Card has several applets running on card, and applet can be added easily. Each applet supports different application programs, and includes file system for data management. This paper presents design and implementation of the file system API based on Java Card for the efficient data management in need of the applet. We referred the smart card international standard ISO7816-4 for the file system and used API supported at Java Card. Results show that it is easy to design and operation of file systems during the applet development, also show lighting of applet's source codes and improved access times.

• 디지털산업정보학회논문지
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• 제13권4호
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• pp.153-162
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• 2017

Advances in communication technologies and the decreasing cost of computers have made distributed computer systems an attractive alternative for satisfying the information needs of large organizations. This paper presents a distributed algorithm for performance improvement through load balancing and file migration in distributed systems. We employed a sender initiated strategy for task migration and used learning automata with several internal states for file migration. A task can be migrated according to the load information of a computer. A file is migrated to the destination processor when it is in the right boundary state. We also described an analytical model for load balancing with file migration to verify the proposed algorithm. Analytical and simulation results show that our algorithm is very well-suited for distributed system environments.

• ETRI Journal
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• 제30권4호
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• pp.624-626
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• 2008

Excessively high temperature deteriorates the reliability and increases the leakage power consumption of microprocessors. The register file, known as one of the hottest functional units in microprocessors, incurs frequent dynamic thermal management operations for thermal control. In this letter, we adopt the banked register file scheme, which was originally proposed to reduce dynamic power consumption. By simply modifying the register file structure, the temperature in the register file was reduced dramatically, resulting in 13.37% performance improvement and 10.49% total processor leakage reduction.

• 한국전자통신학회논문지
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• 제14권1호
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• pp.243-250
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• 2019

본 연구는 클라우드 환경에서 매체기반의 SFMS(: Secure File Management Security) 개발을 통하여 블루투스 기반의 암호모듈을 이용하여 컴퓨터에서 클라우드 데이터를 암 복호화 한다. 블루투스 암호모듈은 클라우드에 저장된 파일을 손쉽게 열람 가능하지만 모듈이 없으면 절대 열람이 불가능하다. 최근 이슈화 되고 있는 해킹이나 개인자료유출 등의 문제점을 근본적으로 차단하는 솔루션이라 할 수 있다.

• 한국컴퓨터정보학회논문지
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• 제22권9호
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• pp.1-8
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• 2017

In this paper, we propose a file system for flash memory which remedies shortcomings of existing flash memory file systems. Besides supporting large block size, the proposed file system reduces time in initializing file system significantly by adopting logical address comprised of erase block number and bitmap for pages in the block to find a page. The file system is suitable for embedded systems with limited main memory since it has small in-memory data structures. It also provides efficient management of obsolete blocks and free blocks, which contribute to the reduction of file update time. Finally the proposed file system can easily configure the maximum file size and file system size limits, which results in portability to emerging larger flash memories. By conducting performance evaluation studies, we show that the proposed file system can contribute to the performance improvement of embedded systems.