• 전기학회논문지
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• 제65권3호
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• pp.520-525
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• 2016

In this paper, Characteristic of power conversion unit of a railway vehicles according to contact loss in feeding system that applied impedance of rigid conductor is analyzed. It applied impedance of rigid bar in modeling of electric railway system. Railway vehicles are performed of modeling based on the performance of the electric railway vehicle. Effects of the contact loss in the power conversion unit were analyzed via main transformer of railway vehicle, the input and output voltage characteristics of the converter through contact loss was generated after linking the vehicle with feeding system.

• 정보관리학회지
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• 제10권1호
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• pp.15-30
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• 1993

하이퍼미디어 시스템은 멀티미디어 정보간의 연상적 관게를 링크, 노드개념에 입각하여 지원함으로써 기존의 데이타베이스 시스템이나 텍스트 검색 시스템의 한계성을 극복해 준다. 본 연구는 텍스트, 그래픽, 영상, 목소리/사운드 등의 멀티미디어 정보를 지원해 주는 하이퍼미디어 시스템을 설계, 구현하였고 시스템의 기능을 보여주기 위하여 성경과 성경 관련 정보에 적용하여 응용시스템을 구축하였다. 특히 본 시스템에서는 탐색과 브라우징 기능을 효율적으로 통합함으로써 하이퍼미디어 시스템의 정보검색 기능과 사용자 인터페이스를 높이도록 설계하였다. 국립중앙도서관에 제안한 고서용 MARC 포멧과 기술규칙을 기초로 그 특징적인 것을 요약 정리한 것이다.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2000년도 제15차 학술회의논문집
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• pp.435-435
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• 2000

Light Rail Transit (LRT) system is a complex and large system in which there are many subsystems, interfaces, functions and demanding performance requirements. Because many contractors participate in the development, it is necessary to apply methods of sharing common objectives and communicating effectively among all of the stakeholders. This paper shows not only the methodology and the results of computer-aided systems engineering including requirement management, functional analysis and architecting LRT system, but also propose a tool to help manage a project by linking WBS (Work Breakdown Structure), work organization and PBS (Product Breakdown Structure). The application of computer-aided tool RDD-100 provides the capability to model product design knowledge and decisions about important issues such as architecting the top-level system. The product design knowledge will be essential in integrating the following life-cycle phase activities over the life of the LRT system. Additionally, when a new generation train system is required, the reuse of the database can increase the system design productivity and effectiveness significantly.

• 대한전기학회논문지
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• 제39권8호
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• pp.836-846
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• 1990

This paper presents a Static Var Compensator (SVC) system compensating the reactive power for power system, which consists of a voltage type Pulse Width Modulation (PWM) converter and a reactance linking the converter to the source. The system drives the four quadrant modes. The system determines the magnitude of the input voltage, and then compares it with the magnitude of the source voltage by regulating the phase of the SVC about the source. Therefore, the system generates leading compensation currents when the input voltage is larger than the source in magnitude, and lagging compensation currents for smaller input voltage. Reactive power about voluntary load in power system is smoothly compensated by those compensation currents, and also power factor of source is improved. Furthermore, the SVC system using PWM method may improve the source current waveforms by eliminating the 5th and 7th harmonic components from the input voltages.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2005년도 제36회 하계학술대회 논문집 A
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• pp.653-657
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• 2005

The commercial contract was made firstly in the world for one set of high temperature superconducting(HTS) cable system between buyer, Korea Electric Power Research Institute and seller, Sumitomo Electric Industries, Ltd. in August 2004. After fabrication, test and examination, the HTS cable system will be installed at the KEPRI's test field in Gochang, Jeonbuk province from the time of July 2005. KEPRI is preparing measurement and test facilities for field test of the HTS cable system and carrying out researches into the design and construction of superconducting cable test building, evaluation of cooling performance, measurement of AC loss, analysis of the quench phenomena due to excess current and means of linking the HTS cable system to the existing electric power supplying system. The constitution of, the method to install and the plan of test operation of the HTS cable system will be presented in this paper.

• 디지털콘텐츠학회 논문지
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• 제10권1호
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• pp.73-85
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• 2009

본 논문은 학습관리시스템(LMS), 학습콘텐츠관리시스템(LCMS), 학습지원도구를 포함한 기업 e-Learning 시스템과 운영을 연계한 통합적 형태의 가이드라인을 제시하고 있다. 본 연구의 목적은 국내 e-Learning 시스템 현황 및 특성을 실태조사를 통해 파악하고, 관련된 국내 e-Learning 시스템의 다양한 질 관리 방법과 운영자, 교.강사, 학습자에게 적합한 실행 전략을 제시하고자 한다. 이를 통해 e-Learning을 새롭게 도입하거나 업그레이드 하고자 하는 교육훈련기관에게 e-Learning 시스템을 구축하고 운영체계를 수립하는데 도움을 줄 수 있을 것이다.

• KSBB Journal
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• 제26권4호
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• pp.352-356
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• 2011

The detection of biomarkers is an important issue for disease diagnosis. However, many systems are not suitable to detect the biomarker itself directly. For direct detection of biomarker proteins in human serum, a new affinity-capture method using aptamers combined with the mass spectrometry was suggested. Since signals from protein samples cannot be amplified, modified chromatin immunoprecipitation (ChIP) and subsequent cross-linking with formaldehyde between aptamers and target proteins were used not to lose the captured target proteins, which allowed us to perform a harsh washing step to remove the non-specifically bound proteins. As a model system, a thrombin aptamer was used as a bait and thrombin as a target protein. Using our modified ChIP and affinity-capture method, non-specific binding proteins on the beads decreased significantly, suggesting that our new method is efficient and can be applied to developing diagnosis systems for various biomarkers.

• 한국비블리아학회지
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• 제21권3호
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• pp.77-89
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• 2010

본 연구의 목적은 문헌의 주제를 효과적으로 표현하기 위해 시소러스 연계 패싯 분류체계(FCT)를 개발하는 것이다. 이에 한국십진분류법을 패싯분류표로 재구조화시키고, 국립중앙도서관 주제명표목표의 디스크립터와 연계하였다. FCT를 기존의 KDC와 비교하면 1) 복합주제를 효과적으로 표현할 수 있고, 2) 인용순서를 변경할 수 있으며, 3) 새로운 분류항목을 추가하기가 용이하다는 장점이 있다. 또한 분류표의 표목을 시소러스의 디스크립터와 연계하여 분류표와 시소러스 간에 패싯을 공유하고, 분류표목의 개념수준 확장에 활용할 수 있었다.

• Bulletin of the Korean Chemical Society
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• 제34권5호
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• pp.1333-1338
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• 2013

Chitosan-based nanoparticles (CSNP) were prepared through ionic cross-linking and gelation of chitosan (CS) by tripolyphosphate (TPP). CS properties such as molecular weight, and preparation conditions were screened and the resulting nanoparticles were examined by Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The obtained particles were consistently spherical with an overall diameter of approximately $107{\pm}20$ nm. They were successfully used as a carrier for Zidovudine, an anti-human immunodeficiency virus (HIV) which, to our knowledge, is novel. The encapsulation ability, loading capacity, and controlled release behavior for these CSNP was evaluated. Results indicated that their intrinsic properties were strongly affected by properties inherent to CS such as molecular weight, and by the preparation condition, such as cross-linking density, which depends on the concentration of the cross-linker. In vitro release tests for the entrapped zidovudine showed that the CNNP provided a continuous release that can last upwards 20 h.

• 한국콘텐츠학회논문지
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• 제3권2호
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• pp.39-45
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• 2003

자바의 동적인 클래스 로딩은 자바 플랫폼에서 실행시간에 소프트웨어 컴포넌트를 동적으로 로딩하기 위한 강력한 메커니즘이다. 다른 시스템에서도 동적 로딩과 링킹을 제공하지만 지연 로딩, 타입안전 링크, 사용자 정의 로딩정책, 다중 이름 공간 등은 자바가 가진 중요한 특징들이다. 클래스 로딩에서 핵심은 타입 안전을 보장하는 것이다. 타입 안전은 자바 보안에서 아주 중요한 부분을 차지한다. 하지만 자바 가상 머신에서 타입 안전에 대한 메커니즘은 매우 복잡하고, 접근이 명확하지 않아서 지금 까지 많은 버그가 발생하여 타입 안전에 문제가 되었다. 본 논문은 자바 가상 머신에서 동적인 클래스 로더의 동작을 분석하고, 연산적 의미론(operational semantics)으로 추상화하고 현재 로드되어진 클래스와 추가된 제한 등을 이용하여 이전에 제시되었던 타입 안전에 대한 문제를 분석한다.