• 대한한방내과학회지
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• 제27권4호
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• pp.855-863
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• 2006

Objectives : This study was performed to evaluate effects of Yangsim-tang extract (YST) on hemodynamics (regional cerebral blood flow (rCBF) and mean arterial blood pressure (MABP) ) in normal rats, and effects of cyclooxygenase and guanylate cyclase under YST. Methods : Laser-Doppler flowmetry (LDF) measured changes of rCBF, and a data acquisition system assembled with MacLab and Macintosh measured changes of MABP. Results : YST significantly increased rCBF, but did not change MABP. Pretreatment with indomethacin significantly inhibited rCBF increased by YST, but pretreatment with methylene blue did not significantly inhibit rCBF increased by YST. Conclusions : YST increases rCBF, and the action of this response is mediated by cyclooxygenase.

• 한국정보과학회:학술대회논문집
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• 한국정보과학회 2006년도 한국컴퓨터종합학술대회 논문집 Vol.33 No.1 (C)
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• pp.118-120
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• 2006

지식관리시스템은 기업들의 생산성을 높이기 위해 사내보유 지식을 획득, 관리하여 후속 업무 처리에 적극 활용하도록 지원하는 시스템이다. 현재 지식관리시스템들에서는 정형적 지식에 대한 추출은 잘 이루어지고 있으나, 조직원들의 암묵지에 대해서는 자발적 등록을 유도하는 보상제도 등의 방법에 의존하고 있다. 본 논문은 업무를 진행함과 동시에 조직원으로부터 지식을 의무적으로 획득할 수 있는 방법에 대해 연구하였다. 또한 지식을 온톨로지 기반으로 표현함으로써 지식을 단지 설명하는 차원의 지식베이스를 구축하는 것이 아니라 새로운 지식을 추론할 수 있는 방법을 제안하였다.

• 한국정보과학회 언어공학연구회:학술대회논문집(한글 및 한국어 정보처리)
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• 한국정보과학회언어공학연구회 1992년도 제4회 한글 및 한국어정보처리 학술대회
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• pp.39-49
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• 1992

시소러스를 작성하기 위해 시소러스 작성자가 고려래야 하는 문제는 단어간의 개념 관계이다. 단어간의 관개는 계층구조에 정의된 개념을 기반으로 분석하여 하향식으로 시소러스를 작성하는 것이 일반적이다. 이러한 방식은 작성자에 의존적이므로 시소러스의 정확도를 보장할 수 없고 주관적인 성향을 가진다. 그래서 Corpus에서 자동으로 개념 및 개념 관계를 추출하는 상향식 방법들이 다양하게 시도되고 있다. 본 논문에서는 시소러스 작성을 위한 자동 개념 획득 도구를 설계, 구현하였다. Mutual Information이라는 방법을 이용하여 공기 정보(Collocation)를 정량화하고 이를 통하여 단어간의 개념관계의 크기를 측정한 후 개념 관계의 크기(MI 값)가 큰 값을 선택하여 개념 화일을 작성한다. 실험 결과로 얻은 개념 화일은 두 개념간의 밀접도를 나타내므로 시소러스 작성에 매우 유용하다.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2009년도 춘계학술대회 논문집
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• pp.1977-1983
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• 2009

This paper described partial discharge(PD) patterns depending on types of insulation defects in CNCO-W cable(Concentric Neutral Closs-linked Polyethylene Insulated Polyolefin-Water Proof Sheathed Power Cable). The PD measurement system consists of a coupling network, a detection impedance, and a low noise amplifier. A 16 bit, 250 MS/s data acquisition system was used to analyze PD patterns. To simulate insulation defects in a power cable, a needle with the curvature radius of $10{\mu}m$ was inserted into the insulation part. We measured phase ($\Phi$), magnitude (q), and counts (n) of PD pulse for the defects, and classified PD patterns using the PRPD (phase Resolved Partial Discharge) method. From the analysis of acquired PD signals, we could find that a unique PD pattern is formed according to the types of defect.

• Nuclear Engineering and Technology
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• 제37권2호
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• pp.185-190
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• 2005

The Korea Institute of Radiological and Medical Sciences (KIRAMS) electron microbeam system has been built with its prototype components. The system is composed of an electron gun, a beam transport chamber, and a cell image acquisition and positioning stage. Each component has been upgraded through repetitive performance tests for various parametric arrangements. This paper presents the preliminary results of the performance test on the beam control and detection parts of the system.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2007년도 하계종합학술대회 논문집
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• pp.211-212
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• 2007

Pose-variation factors present a significant problem in 2D face recognition. To solve this problem, there are various approaches for a 3D face acquisition system which was able to generate multi-view images. However, this created another pose estimation problem in terms of normalizing the 3D face data. This paper presents a 3D head pose-normalization method using 2D and 3D interaction. The proposed method uses 2D information with the AAM(Active Appearance Model) and 3D information with a 3D normal vector. In order to verify the performance of the proposed method, we designed an experiment using 2.5D face recognition. Experimental results showed that the proposed method is robust against pose variation.

• 한국통신학회논문지
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• 제38C권9호
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• pp.757-763
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• 2013

본 논문에서는 수도권 서북부 지역의 3차원 지리정보를 바탕으로 다중예봉모형을 (multiple knife-edge model) 적용해 전파교란기와 수신기의 지리적 위치에 따른 회절손실을 (diffraction loss) 계산하고, 이를 바탕으로 광대역 잡음재밍 (wideband Gaussian null-to-null noise jamming), 스펙트럼일치형재밍 (matched spectrum jamming), 연속파재밍에 (continuous wave jamming) 의한 GPS (global positioning system) L1 C/A (coarse/acquisition) 신호의 여유재밍전력을 (marginal jamming power) 보인다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2001년도 하계학술대회 논문집 D
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• pp.2643-2645
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• 2001

In this paper, a problem of limited sampling time that occurs essentially in digital data acquisition system is discussed. Low sampling frequency and a lot of processed data in micro-controller interferes normal operation of the controller from acquiring information in some case. To settle this problem, we design the sub-system which consists of a new simple micro-controller. which is managed the particular sensor making the trouble to main-controller system.

• 대한산업공학회지
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• 제14권2호
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• pp.53-61
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• 1988

Games such as baseball, soccer are scheduled by a given game type such as tournament, league or their mixed form. The objective of this paper is to find an efficient game-scheduling method with respect to traveling distance, break-time and other conditions. In this paper we first present two models which minimize traveling distance. The first model that a match is played once each other is solved by a heuristic method. In the second model that a match is played more than once, teams are paired by a modified 0 - 1 programming, and the pairs are rearranged in order to generate a number of workable schedules. Then Expert Systems is applied to solve breake-time and other conditions. In order to represent expertise's knowledge effectively, we present a new design of knowledge-base and data-base, inference engine including many rules and meta-rules which controls the global system. In knowledge-base, binary relation among various attributes is used to ease not only knowledge acquisition but also system execution.

• 산업공학
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• 제16권1호
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• pp.34-43
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• 2003

The Korean government has been working to reduce national logistics costs since the early 1990s. One of the major plans instituted by the government was to build five complex freight terminals using ICDs(inland container depots) as hub inland terminals. This paper explains the process and the methods adopted for site selection, with special focus on the Youngnam Freight Terminal. Among nineteen developable sites in Youngnam region, four candidates were selected based on the Map Overlay Approach under several criteria, including land acquisition costs, proximity to major highways and railroads, suitability of the terrain, etc. In this study, we used the AHP to select the best site among the four sites.