• KIISE Transactions on Computing Practices
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• v.20 no.12
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• pp.623-631
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• 2014

Comparison of two representative deduplication file systems, LessFS and SDFS, shows that Lessfs is better in execution time and CPU utilization while SDFS is better in storage usage (around 1/8 less than general file systems). In this paper, a new system is proposed where the advantages of SDFS and Lessfs are combined. The new system uses multiple DFEs and one DSE to maintain the integrity and consistency of the data. An evaluation study to compare between Single DFE and Dual DFE indicates that the Dual DFE was better than the Single DFE. The Dual DFE reduced the CPU usage and provided fast deduplication time. This reveals that proposed system can be used to solve the problem of an increase in large data storage and power consumption.

• The Journal of the Korea Contents Association
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• v.17 no.7
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• pp.133-143
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• 2017

The objective of this study is to examine whether citizens' expectations of policy impacts of the government's efforts to reduce overlap and duplication among its programs have any influence on citizens' policy attitude. Furthermore, this study examines whether the influence is differential and dependent on income class differences. The results suggest that 'reducing budget waste' bas a positive impact on policy attitude whereas 'enhancing work performance' bad no significant impact. And the results reveal that middle class bold a more negative view than upper class on the government's efforts. Concerning the moderating effect. income class differences weaken the positive relationship between 'reducing budget waste' and policy attitude as well the negative relationship between 'enhancing work performance' and policy attitude. The policy implication of this study is, to gain support from citizens for its overlap and duplication reduction policies, it is critical that the government should publicize that there exists a more of citizens benefitting from such policies.

• Journal of Science Education
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• v.38 no.2
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• pp.231-243
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• 2014

The purpose of this study was to compare the duplication problem of achievement standards between science and other subjects in the 2009 Revised National Curriculum and to search for solutions and implications for this problem. From the results of this study, we found that the achievement standards of practical arts, social studies, physical education and ethics were overlapped with science's ones. The duplication of content elements for 'our body and health', 'living things and environment', 'biodiversity' and 'natural disaster' categories was not high, that is, their achievement standards were relatively well-differentiated and reflected the intrinsic characteristic of each subject under common topics. But, in case of 'reproduction and development' and 'world of technology' categories, the problem of duplications was serious. In order to cope with this problem, we need to consider solutions such as merging or integrating the achievement standards of related subjects. The relevant experts should conduct in-depth discussion and negotiation, and develop achievement standards more consistent with the identity of each subject.

• Journal of KIISE:Software and Applications
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• v.31 no.7
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• pp.869-882
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• 2004

This paper proposes an effective method to create logically consistent and structured requirement model by applying consistency control approach of the formal method to the use-case modeling. This method integrates the multi-perspective scattered requirement segments that may overlap and conflict each other into a structured requirement model. The model structure can be analyzed based on context goal and concerned area overlap analysis. The model consistency can be achieved by using specification overlap-based consistency checking method as an integration vehicle. An experimental application to case study shows that the Proposed method can successfully identify requirement overlaps and inconsistency. It can also transfer multi-viewpoint requirement segments into a consistently integrated use-case model to clarify software behaviors and functionality This method helps users to enhance capability to identify specification inconsistency in the use-case modeling at the early stage of software engineering development. The proposed approach can also facilitate communication between users and developers to ensure customer satisfaction.

• Korean journal of communication and information
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• v.66
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• pp.159-183
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• 2014

This study analyzed the competition among three game platforms, PC, Console and Mobile in aspect of user's gratifications using niche analysis. To do this, four gratification factors, 'transportability and accessibility', 'liveliness and variety', 'availability and economic feasibility', 'relationship', were assessed. To investigate competition level among three game platforms, niche breadth, niche overlap, competitive superiority of four gratification factors were analyzed. The results of niche analysis show that mobile platform appeared as a most competitive platform because it utilized diverse resources for game user gratification and had competitive superiority in 'transportability and accessibility' which appeared as most important factor determining user's gratification. However there was no game platform which had competitive superiority in all four gratification factors.

• Journal of KIISE
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• v.43 no.2
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• pp.143-151
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• 2016

Data deduplication is an important technique for cloud storage savings. These techniques are especially important for encrypted data because data deduplication over plaintext is basically vulnerable for data confidentiality. We examined encrypted data deduplication with the aid of a key issuing server and compared Convergent Encryption with a technique created by M.Bellare et al. In addition, we implemented this technique over not only Dropbox but also an open cloud storage service, Openstack Swift. We measured the performance for this technique over Dropbox and Openstack Swift. According to our results, we verified that the encrypted data deduplication technique with the aid of a key issuing server is a feasible and versatile method.

• Proceedings of the Korea Society for Simulation Conference
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• 1998.10a
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• pp.161-165
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• 1998

다중 프로세서 구조로 실시간 분산 처리를 하는 전전자 교환기 시스템은 그 특성상 2개 이상의 프로세서에 동일한 값을 유지하는 중복 데이터의 사용이 필수적이다. 시스템의 자원 정보, 번호 번역 정보, 과금 정보 등이 중복 데이터로 사용된다. 이러한 중복 데이터에 대한 변경은 불일치 상태를 회피하기 위해 그 처리에 많은 비용과 제한이 따른다. 과도한 시그널 전송 및 로그 저장, 재전송 알고리즘은 데이터베이스 시스템의 성능을 저하시키고 때때로 순간적인 마비 상태까지도 유발할 수 있다. 본 논문에서는 기존 일관성 방안의 문제점을 분석하고 단일-버스 다중-프로세서 시스템에서 각각의 캐쉬들간의 일관성 유지를 위한 write-through 캐쉬 일관성 프로토콜을 사용하여 저 비용이며 효율적인 중복 데이터 일관성 유지 방안을 제시한다.

• Proceedings of the Korea Information Processing Society Conference
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• 2015.10a
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• pp.730-732
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• 2015

데이터 중복 제거 기술은 클라우드 스토리지에 저장되어 있는 중복된 데이터들 중에 하나의 데이터만 저장하는 기술로, 클라우드 스토리지 서비스에서 저장효율을 높이기 위한 핵심적인 기술 중 하나이다. 하지만 아웃소싱된 데이터가 암호화가 되지 않으면 기밀성을 유지하지 못해 프라이버시에 큰 영향을 끼치게 된다. 데이터를 암호화하여 아웃소싱하는 경우에는 암호문의 특성으로 인해 중복 제거 기술이 적용하기 힘든 단점을 가지고 있으며 이를 위해 수렴 암호화를 사용한다. 본 논문에서는 수렴 암호화로 암호화된 데이터에 대해 중복제거 기술을 적용하는 여러 제안모델을 분석하고, 개선방안을 제시한다.

• Proceedings of the Korea Contents Association Conference
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• 2018.05a
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• pp.15-16
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• 2018

NGS 분석과정에서는 정확도를 높이기 위해서 중합 효소 연쇄반응 (PCR)을 통해 DNA 리드들을 증폭한다. PCR 증폭은 DNA 리드의 중복을 발생시키며 중복으로 인해 NGS 과정의 정확성이 저하되는 문제가 발생한다. 본 논문에서는 DNA 리드 중복을 제거하는 도구중 하나인 Samblaster 의 병렬화를 위한 DNA 리드 분할 방법을 제안한다. DNA 리드를 분할하여 Samblaster를 병렬 실행 하도록 하여 수행시간을 단축 할 수 있도록 한다.

• Proceedings of the Korean Society for Information Management Conference
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• 1998.08a
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• pp.105-108
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• 1998

여러 색인들에 수록된 한국의학논문의 중복정도를 연구하여, 연구업적을 효율적으로 평가하기 위한 색인 선정방법을 제시하고자 하였다. EMBASE, MEDLINE, SCISEARCH에 수록된 1990년에서 1995년 사이의 한국의학논문 중에서, 외국 학술지에 게재된 한국의학논문의 건수와 연도별 증가추이를 조사 분석하였다. 1990년, 1992년, 1994년 3개년을 선정하여, 2개 이상 데이터베이스에서 중복 검색된 논문수, 특정 데이터베이스에서만 검색된 논문수, 그 논문들이 실린 학술지를 분석하였다. 의학연구업적을 평가할 때에, 한 개의 데이터베이스를 사용한다면 한국의학논문이 가장 많이 검색된 SCISEARCH를, 두 개의 데이터베이스를 활용한다면 EMBASE를 추가하는 것이 효율적인 데이터베이스 선정방법이라고 할 수 있다.