• Proceedings of the Korean Institute of Intelligent Systems Conference
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• 2004.10a
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• pp.345-350
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• 2004

In this paper we study the controllability for the nonlinear fuzzy integro-differential equations on E$_{N}$$^{n}$ by using the concept of fuzzy number of dimension n whose values are normal, convex, upper semicontinuous and compactly supported surface in R$^n$. E$_{N}$$^{n}$ be the set of all fuzzy numbers in R$^n$ with edges having bases parallel to axis X$_1$, X$_2$, …, X$_{n}$ .X> .

• Journal of applied mathematics & informatics
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• v.5 no.3
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• pp.615-632
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• 1998

Soliton solutions of a class of generalized nonlinear evo-lution equations are discussed analytically and numerically which is achieved using a travelling wave method to formulate one-soliton solution and the finite difference method to the numerical dolutions and the interactions between the solitons for the generalized nonlinear Schrodinger equations. The characteristic behavior of the nonlinear-ity admitted in the system has been investigated and the soliton state of the system in the limit of $\alpha\;\longrightarrow\;0$ and $\alpha\;\longrightarrow\;\infty$ has been studied. The results presented show that soliton phenomena are character-istics associated with the nonlinearities of the dynamical systems.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2000.11a
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• pp.55-59
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• 2000

Nonlinearity is one of the primary causes of error in precision length measurement using laser interferometer. It arises periodically. The periodical nonlinearity usually ranges from sub-naometre to several namertres. In the homodyne interferometer, it results from a number of factors including polarization mixing, imperfect optical clement, unequal gain of detectors, misalignment of axes between input beam and beam splitter. In this paper, we described a method for measuring and compensating the nonlinearity of homodyne interferometer using the elliptical least-square fitting technique associated with electric method and experimental results in one frequency polarization interferometer.

• Proceedings of the Korean Society of Marine Engineers Conference
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• 2002.05a
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• pp.161-166
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• 2002

The resent experimental study is focused on the application of multi-point simultaneous measurement by PIV Particle Image Velocimetry) to guide vane region within diffuser pump. Various different kinds of rotational veto ity and changing clearance between Guide Vane and Impeller were selected as experimental condition. Optimized ross correlation identification to obtain velocity vectors is implemented with direct calculation of correlation coeffi cients. Fine optical setup concerned with PW performance is arranged for the accurate PW measurement of high peed complex flow. Variable flow pattern are represented quantitatively at the stator region.

• Proceedings of the Earthquake Engineering Society of Korea Conference
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• 2001.09a
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• pp.147-154
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• 2001

In this study, comprehensive seismic performance analysis were performed for the concrete face rockfill dam(CFRD) designed seismic coefficient method(0. 10g). The static and pseudo-static FEM analysis, limited equilibrium method and dynamic FEM analysis were used for the dam safety analysis. The results of the seismic analysis were that the minimum factor of safety of down slope was 1.2 and horizontal displacement increased 8cm and vertical displacement increased 1.2cm at dam crest rather than those of static condition. The model dam did not show any serious tai lure in seismic stabi1ity for 0.13g. And much more research is still necessary in seismic safety of CFRD.

• Journal of the Korean Regional Science Association
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• v.14 no.1
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• pp.21-45
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• 1998

Urban quality of life(QOL) is recently considered as the important determinant of inter-urban migration and industrial location chice. However, there is little concensus in the method of measurement of QOL. This study provides an theoretical framework of the measurement of QOL. This study provides an theoretical framework of the measurement of QOL, and developes a new method, a multi-year$\cdot$mulit-dimensional distance index model. Based on the theoretical framework and the method, the QOLs of 74 urban areas in Korea are measured, and the determinants of the QOL and the changes of the QOL between two years of 1993 and 1995 are analyzed. The results of the analysis are as follows: 1) The interurban differences of the QOL tens to be interban differences of the QOL tend to be intensified over time. 2) The OQLs of the cities in the Capital Region are relatively deteriorated. 3) The conditions of education$\cdot$Culture$\cdot$leisure life determiner over 65% of the QOL of the Korean cities.

• Transactions of the Korean Society of Mechanical Engineers
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• v.10 no.6
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• pp.959-965
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• 1986

본 논문에서는 모듀울 로봇은 공장 자동화를 달성하기 위한 경제적인 방법으 로 기대되고 있다. 모듀울 로봇을 구성하는 모듀울을 개발 설계하기 위해서는 먼저 유용한 로봇을 기본 구조를 연구하여야 한다. 일반적으로 로봇의 처음 3개의 관절은 로봇 손의 위치를 결정하는 데 쓰이고 나머지 관절은 로(positional maneuverability matrix)과 방향기동행열로 구성됨음을 보이고, 가분성(separability)의 조건을 제시하 였다.또한 희전관절이나 미끄름관절로 이루어진 3자유도 로봇 팔의 3차원 공간에서 의 기본형태는 12개임을 밝히고, 3자유도 손목이 3개 방향을 완전히 조정할 수 있기 위해서는 3개의 회전관절축이 서로 직교하여야 함을 보였다.

• Proceedings of the Korean Society of Applied Pharmacology
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• 1995.04a
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• pp.103-103
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• 1995

There have been several reports regarding the effects of Panax ginseng on allergy reactions. However, they are very sporadic and no systemic yet. To study the effects of Panax ginseng on hypersensitivity, either ginseng total saponin (GTS, 200mg/kg, oral, two hours prior to experiments) or ethanol extract (50 and 200 mg/kg, oral, one week) was administered. Various parameters were employed to assess the anti-allergic actions of Panax ginseng 48hr passive cutaneous anaphylaxis (PCA), skin reactions, histamine release from rat peritoneal mast eel Is, and lipoxygenase activity. In 48hr PCA, and in skin reactions induced by chemical mediators (histamine, serotonin) and mediator releaser (compound 48/80), Panax ginseng did not suppress sensitized immune functions, rather showed tendency to increase the histamine-induced vascular permeabi1ity. Panax ginseng did not inhibit lipoxygenase activity either.

• Science of Emotion and Sensibility
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• v.11 no.1
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• pp.123-129
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• 2008

The purpose of this study is to analyse the effect of weaving preparatory process characteristics on the PET fabric sensibility through assessment of handle, garment formability and sewability for the enhancement of the physical property of the PET fabrics. For this purpose, eleven fabric specimens processed on the interlacing, pirn winder, 2-for-1 twister, weaving and dyeing and finishing processes were prepared and processing tension and interlacing intensity after each process were measured with various processing conditions.

• The Transactions of the Korean Institute of Electrical Engineers A
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• v.50 no.10
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• pp.447-453
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• 2001

This paper presents the unified reliability evaluation technique of distribution system. To calculate accurate reliabi1ity and reliability indices which can consider line limitation and voltage drop of distribution system, we employed the deterministic evaluation technique with PLOC technique. And to evaluate the distribution system, we presented the evaluating method which is based on Analytic network process. As a result, we can evaluate the distribution system and build the expansion planning of the system considering system load and reliability indices.