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주문형 비디오 서버에서 비디오 데이터의 인기도에 따른 분산 배치 기법
안유정,원유헌,An, Yu-Jeong,Won, Yu-Heon 한국정보처리학회 2000 정보처리학회논문지 Vol.7 No.2
A retrieval performance of VOD sever is estimated by how quickly it services popular videos to users and how many users it is able to service. Each video data is placed on heterogeneous disks and placement techniques are various, retrieval performance is under the control of these elements, so that a retrieval performance is affected by placement policy. In this paper, we place video data considering their characteristics, especially, we place videos distributively according to their popularity. To verify our policy, we make various environment of experiment, estimate a placement policy using popularity of videos and a contrary policy, and compare them.
산업안전보건 실태조사로 본 사업장 안전보건활동이 사고율에 미치는 영향
안유정,박선영,이창훈,김용진,조교영,김영민 한국데이터정보과학회 2019 한국데이터정보과학회지 Vol.30 No.6
This study analyzed the current status of safety and health management organization including education status, and activities conducted by manufacturing and service businesses through the occupational safety and health survey conducted in 2018. The effect of safety and health activities on the accident rate in 2017 was identified using the weighted Poisson regression. This study shows that larger businesses in both manufacturing and service industries have lower accident rates than smaller ones. In particular, manufacturing businesses had relatively low accident rates when the industrial safety and health committee was set up and workers had an awareness with high levels of safety behavior. In the service industry, the appointment state of health managers was exclusive worker, and the businesses installed by the industrial safety and health commission lead to low accident rate. In addition, the businesses with high safety education scores showed high accident rates. We expect this study to be used as a basic material for identifying the causes of industrial accidents. 본 연구는 2018년 실시 된 산업안전보건 실태조사 자료를 이용하여 제조업 및 서비스업 사업장에서 수행하는 안전보건관리 조직현황과 교육현황 및 활동자료를 분석하였다. 포아송 회귀분석을 이용하여 안전보건활동이 2017년 산업재해에 미치는 영향을 연구하였다. 제조업 및 서비스업 모두 규모가 큰 사업체가 규모가 작은 사업체보다 사고율이 낮게 나타났다. 특히, 제조업은 산업안전보건위원회가 설치된 사업체와 근로자 안전행동수준이 높은 사업체인 경우 상대적으로 산업재해율이 낮게 나타났으며 서비스업의 경우 보건관리자 선임형태가 전담이며 산업안전위원회가 설치된 사업체가 산업재해율이 낮게 나타났다. 또한 안전교육점수가 높은 사업체가 산업재해율이 높게 나타났다. 본 연구결과가 업종별 안전보건활동에 따른 산업재해 발생원인 규명의 기초자료로 활용되기 기대한다.
Effect of Lithium Doping on the Transport Properties of MoO3 Ceramics
안유정,김고운,이준혁,김현정,이재광,진형진 한국물리학회 2019 새물리 Vol.69 No.10
In this research, we studied the effects of lithium doping on the transport properties of MoO3 ceramics. A series of lightly lithium-doped MoO3 ceramics was prepared: 2, 4 and 8 mol% Li-doped MoO3. The x-ray diffraction analysis confirmed that the typical MoO3 structures were retained at the low doping. However, from laser-induced-breakdown spectroscopy, the differences in the peak intensities of the doped samples clearly indicates that lithium ions are successfully incorporated into the lattices in different amounts. To see the effects of the lithium doping on the transport properties in the MoO3 lattices, impedance spectroscopy is used in the capacitor geometry. A systematic increase in the overall bulk conductivity and a faster relaxation behavior were observed when the doping level was increased. Lastly, when the doping level was increased the activation energy was drastically decreased, which indicates that the lithium facilitates transport along a 2D path.
안유정,신용민 한국해양비즈니스학회 2022 해양비즈니스 Vol.- No.51
The purpose of this study is to analyze the factors affecting the purchase of quality-certified fishery products to activate the quality certification system and to help promote the consumption of quality-certified fishery products. For analysis, this study use ZIP Model, ZINB Model, ZIOP Model. As a result of the analysis, it was found that the factors affecting customer’s participation in the market were age, recognition about the certification of fish and fishery products, price-oriented tendency for fish, and income. On the other hand, the variables affecting the number of purchases were academic background, income, whether or not they have preschool children, sensitivity about radioactive contamination water, sensitivity about food quality and safety, and recognition about the certification of fish and fishery products. Therefore, since the determinants of customer’s participation in the market and determinants of the number of purchases are different, measures to expand market participation in quality-certified fishery products and measures to increase the number of purchases should be promoted differently.
클러스터드 주문형 비디오 서버에서 비디오 스트림의 검색효율을 높이는 배치정책
안유정,원유헌 한국통신학회 1999 韓國通信學會論文誌 Vol.24 No.9
One of the most important goals in VOD servers is to provide services to more clients with services which clients request. In order to provide service efficiently and rapidly, though considering a few of policies, efficient placement of data when they are stored is direct cause to improve efficiency of retrievals. In this paper, we propose a efficient placement policy, encoded video data being stored in clustered VOD servers. In the proposed placement policy, partitioning a large disk array into smaller disk groups which consists of a few of disks with similar performances, specially disk I/O bandwidth. In last chapter, we compare proposed placement policy with conventional policies, and show the results of improved performances with proposed policy. 주문형 비디오 서버의 중요한 목표는 일정시간 내에 보다 많은 클라이언트들에게 그들이 원하는 서비스를 제공하는 것이다. 이와 같이 효율적이고 빠른 정보 제공을 위해서는 여러 가지 정책들이 함께 고려되어야 하지만, 정보 저장시의 효율적인 정보의 배치는 검색의 효율을 높이는 중요한 요인이 된다. 본 연구에서는 클러스터드 주문형 비디오 서버에서 비디오 데이터들을 저장 시스템에 저장할 때, 보다 효율적인 검색 성능을 제공할 수 있는 배치정책을 제안한다. 제안된 배치 정책은 대규모의 디스크 배열을 구성하는 다양한 성능의 디스크들을 평가하여 유사한 성능을 갖는 것들끼리 디스크 그룹을 구성하고 각 디스크 그룹마다 그 성능에 적절한 특성을 지닌 비디오 데이터를 할당한다. 또한 제안된 정책의 검증을 위해 모의 실험을 통해 제안된 정책과 기존의 배치 정책을 비교하므로써 검색 효율이 개선됨을 보인다.