• 한국콘텐츠학회논문지
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• 제17권11호
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• pp.252-263
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• 2017

본 연구는 이용과 충족 이론을 기반으로 인스타그램 사진 공유 행동에 영향을 미치는 영향 요인들을 파악하기 위한 목적으로 수행되었다. 본 연구는 인스타그램을 이용하고 있으며, 최근 3개월 이내에 인스타그램에 사진을 공유한 경험이 있는 356명의 이용자를 대상으로 분석을 실시하였다. 분석 방법은 SPSS 19.0과 AMOS 21.0을 활용하여 빈도분석, 기술통계, 신뢰도 검증, 확인적 요인 분석, 구조 모형 분석을 실시하였다. 본 연구의 결과는 다음과 같다. 첫째, 소통이 인스타그램 사진 공유 행동에 가장 많은 영향을 미치는 것으로 나타났다. 둘째, 오락 추구가 인스타그램 사진 공유 행동에 정(+)적인 영향을 미치는 것으로 나타났다. 셋째, 자기 표현이 인스타그램 사진 공유 행동에 정(+)적인 영향을 미치는 것으로 나타났다. 넷째, 서비스 이용자 신뢰가 인스타그램 사진 공유 행동에 정(+)적인 영향을 미치는 것으로 나타났다.

• 한국BIM학회 논문집
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• 제6권1호
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• pp.25-32
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• 2016

In BIM environments for infrastructures, civil structures such as road, bridge and tunnel etc., created into 3D objects, integrated with their properties, securing BIM design productivity is very critical during 3D modeling. To solve this issue, configuring BIM libraries so that the users can utilize prefabricating in advance 3D objects that have been applying repeatedly during BIM design is essential so much. Current BIM libraries have made focused on Ready-Made for architectural facilities. However, establishing environment for delivering BIM library for civil facilities is very sparse. Accordingly, this study developed a web-based sharing system for delivering BIM library contents based on standardized drawing for civil area. To do this, we have analyzed core features and operation system of BIM library sharing system in domestic and overseas. Besides, functional requirements that are necessary for developing BIM library sharing system was derived, and through operation scenario configuration, the web-based system was developed according to the detailed mechanism. It is expected that this system can enhance BIM design productivity during library based modeling, and can be utilized as construction supporting tools that can help construction managers to make a design change.

• JSTS:Journal of Semiconductor Technology and Science
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• 제14권5호
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• pp.549-556
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• 2014

This paper proposes a highly power-efficient single-inductor multiple-outputs (SIMO) DC-DC converter with a gate charge sharing method in which gate charges of output switches are shared to improve the power efficiency and to reduce the switching power loss. The proposed converter was fabricated by using a $0.18{\mu}m$ CMOS process technology with high voltage devices of 5 V. The input voltage range of the converter is from 2.8 V to 4.2 V, which is based on a single cell lithium-ion battery, and the output voltages are 1.0 V, 1.2 V, 1.8 V, 2.5 V, and 3.3 V. Using the proposed gate charge sharing method, the maximum power efficiency is measured to be 87.2% at the total output current of 450 mA. The measured power efficiency improved by 2.1% compared with that of the SIMO DC-DC converter without the proposed gate charge sharing method.

• 한국인터넷방송통신학회논문지
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• 제15권1호
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• pp.111-116
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• 2015

본 논문은 인지 통신의 1차, 2차 시스템 사이에서 발생되는 협력 스펙트럼 공유 모델을 고려한다. 제시된 모델은 동상 신호로 표현되는 1차 사용자의 메시지가 존재할 때, 직교 위상 기반의 신호인 2차 사용자의 메시지가 존재하기 위한 단일 2차 송신기 ST의 배치에 대해 표현한다. 상호 간섭이 없는 순간적인 스펙트럼 공유로 가정하였으므로, 2차 사용자의 동작으로 인한 1차 사용자의 동작을 보호하는 것은 불필요하다. 또한 1차 시스템의 신호, 2차 시스템의 신호가 동상 및 직교 위상인 직교 차원에 위치하는 것을 기반으로 하기 때문에, 1차 시스템과 2차 시스템의 신호는 상호 간섭이 발생하지 않으며 2차 시스템 전원의 일부를 사용하여 1차 시스템의 신호를 강화시킬 수 있다.

• 한국콘텐츠학회논문지
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• 제15권2호
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• pp.101-108
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• 2015

위치공유기반 서비스(Location-sharing based service)는 사용자가 친구관계를 맺고 있는 다른 사용자와 자신의 위치정보를 공유하는 서비스를 일컫는다. 이 때, 이 위치정보는 서비스 제공자(SP, Service Provider)를 통해 공유되며, 자신의 위치정보는 서비스 제공자에게 노출되게 된다. 이로써 개인의 위치정보가 SP에게 노출되는 프라이버시 문제가 제기되어 왔고, 이를 보호하기 위한 메커니즘들이 제안되었다. 본 논문에서는 위치공유기반 서비스의 종류와 그 특징을 살펴보고, 이를 위한 프라이버시 보호 메커니즘들의 연구 동향을 조사한다. 조사된 기존 메커니즘 분석을 통해, 현 서비스에 적합한 프라이버시 메커니즘 설계 방향 및 향후 연구 방향을 제언한다.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제16권3호
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• pp.1028-1046
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• 2022

Genome-wide association studies (GWAS) aim to find the significant genetic variants for common complex disease. However, genotype data has privacy information such as disease status and identity, which make data sharing and research difficult. Differential privacy is widely used in the privacy protection of data sharing. The current differential privacy approach in GWAS pays no attention to raw data but to statistical data, and doesn't achieve equilibrium between utility and privacy, so that data sharing is hindered and it hampers the development of genomics. To share data more securely, we propose a differential privacy preserving approach of data sharing for GWAS, and achieve the equilibrium between privacy and data utility. Firstly, a reasonable disturbance interval for the genotype is calculated based on the expected utility. Secondly, based on the interval, we get the Nash equilibrium point between utility and privacy. Finally, based on the equilibrium point, the original genotype matrix is perturbed with differential privacy, and the corresponding random genotype matrix is obtained. We theoretically and experimentally show that the method satisfies expected privacy protection and utility. This method provides engineering guidance for protecting GWAS data privacy.

• 한국초전도저온공학회:학술대회논문집
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• 한국초전도저온공학회 2003년도 학술대회 논문집
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• pp.272-275
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• 2003

Quench and recovery process of high-temperature-superconductor(HTS) film deposited on the sapphire substrate is studied numerically. The quench is developed by fault current and the superconductivity is recovered by convection of heat into coolant. After the fault current, the HTS film experiences the quench state, current sharing state, and finally recovers the superconductivity. Numerical results of this study are compared to the previous experimental results, and shows that this numerical work can explain the mechanism of quench/recovery characteristics of HTS film.

• 수산경영론집
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• 제46권2호
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• pp.43-57
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• 2015

The study aims to identify the current status of aquaculture information in Korea and suggests policy directions for its integrated management. Firstly, the study focuses on the identification of the current status of aquaculture information by reviewing how aquaculture information is managed. Secondly, this study identifies problems such as lacks in necessary aquaculture information, inefficiency caused by dispersion and overlapping of information, absence of integrated management system and insufficient sharing of information. After identifying the current status of aquaculture information and its problems, the study suggests three basic directions to systematically integrate and manage the information such as establishment of infrastructure for promoting the integrated management of aquaculture information, generation and systematic management of useful aquaculture information and enhancement of user convenience. Finally, the study suggests detailed strategies such as establishment of a foundation to facilitate integrated management of aquaculture information, organization of organic network, sharing of more information, creation of necessary information through demand survey, creation of systematic management system, provision of a customized total service, and increase in education and PR activities on information use.

• KIEE International Transactions on Power Engineering
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• 제3A권4호
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• pp.222-230
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• 2003

This paper presents reference designs for vapor-cooled HTS/Copper leads rated at 25 kA and 40 kA and that satisfy a protection criterion. Each HTS section is cooled by the effluent helium vapor boiling from a 4.2-K bath. Each HTS section is based on a design concept in which a short portion of its warm end (77.3 K) operates in the current-sharing mode; such operation results in a considerable saving for HTS materials required in the HTS section. Two designs of "fully superconducting" vapor-cooled HTS sections, one rated at 25 kA and the other at 40 kA are also presented as comparison bases for the new HTS sections. Each warm end of HTS sections is coupled to an optimal vapor-cooled copper lead rated at the same current as that for the HTS section. The extra coolant required at 77.3 K at the coupling station, an optimal length of the copper section will be shorter than that optimized for helium-vapor cooling between 4.2 K and room temperature.mperature.

• Journal of Electrical Engineering and Technology
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• 제9권4호
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• pp.1296-1308
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• 2014

This paper presents a new zero voltage switching (ZVS) converter for medium power and high input voltage applications. Three three-level pulse-width modulation (PWM) circuits with the same power switches are adopted to clamp the voltage stress of MOSFETs at $V_{in}/2$ and to achieve load current sharing. Thus, the current stresses and power ratings of transformers and power semiconductors at the secondary side are reduced. The resonant inductance and resonant capacitance are resonant at the transition interval such that active switches are turned on at ZVS within a wide range of input voltage and load condition. The series-connected transformers are adopted in each three-level circuit. Each transformer can work as an inductor to smooth the output current or a transformer to achieve the electric isolation and power transfer. Thus, no output inductor is needed at the secondary side. Three center-tapped rectifiers connected in parallel are used at the secondary side to achieve load current sharing. Compared with the conventional parallel three-level converters, the proposed converter has less switch counts. Finally, experiments based on a 1.44kW prototype are provided to verify the operation principle of proposed converter.