• 한국조명전기설비학회:학술대회논문집
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• 한국조명전기설비학회 1992년도 추계학술발표회논문집
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• pp.51-55
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• 1992

By using the state plane approach, the steady state analysis and design of a half bridge parallel-series (LLC-type) resonant converter (HBPSRC) operating in the continous conduction made is presented. The state-plane diagram representation of the converter response gives good insight into the converter operation. Based on this analysis, a set of steady state characteristic waves for HBPSRC is presented. A simple design procedure is given and design example for a 100watts, 30KHz HBPSRC is presented for illustrative purposes.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2001년도 ICCAS
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• pp.86.1-86
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• 2001

Combined with a counter, wheel or strip encoders which have equally divided markers are one of frequent measuring choices towards various applications in terms of cost, simplicity, and diversity of measurements, e.g., measuring displacement, velocity, acceleration, and so on. Often, velocity is measured by counting the series of reference clocks for a period of time which sensor-carrying device took for traveling two adjacent encoding markers. Quantizaion error of such that the disturbance caused by quantization error is under control. This paper identifies design issues, developes theory, and proposes a paradigm to design a velocity measurement system such ...

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 1987년도 한국자동제어학술회의논문집; 한국과학기술대학, 충남; 16-17 Oct. 1987
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• pp.115-119
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• 1987

In this paper the observer design problem in bilinear systems is studied using the Walsh functions as approximating set of functions to find a finite series expansion of the state of bilinear system. A classical Liapnove method, to finding a class of observer feedback matrix, is applied to ensure uniform asymptotic stability of the observation error dynamics. An algorithm is derived for observer state eq. via Walsh function. The basic objective is to develop a computational algorithm for the determination of the coefficients in the expansion. This approach technique gives satisfactory result as well provides precise and effective method for the bilinear observer design problem.

• 한국관개배수논문집
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• 제5권1호
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• pp.32-46
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• 1998

This study was conducted to derive optimal design floods by generalized gamma distribution model of the annual maximum series at six watersheds along Han and Nag Dong river systems. Design floods obtained by different methods for estimation of parameters

• 한국전산유체공학회:학술대회논문집
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• 한국전산유체공학회 1997년도 추계 학술대회논문집
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• pp.126-130
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• 1997

A new and efficient method is presented for design optimization, which is based on a computational fluid dynamics (CFD). The method is applied to design an airfoil configuration. The Navier-Stokes equations are solved for the viscous analysis of the flow, which provides the object function. The CFD analysis is then coupled with the optimization procedure that used a conjugate gradient method. During the one-dimensional search of the optimization procedure, an approximate flow analysis based on a first-order Taylor series expansion is used to reduce the computational cost, (This study is supported by Korean Ministry of Education through Research Fund)

• 한국화재소방학회:학술대회논문집
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• 한국화재소방학회 2008년도 춘계학술논문발표회 논문집
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• pp.341-344
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• 2008

By investigating a series of catastrophic tunnel fires, this research aims to evaluate the fire resistance design method as applied to tunnel structures in Korea. It is shown that the current strategy is oriented towards smoke control and ventilation to reduce the loss of life. As structural collapse is not regarded, a general guide is proposed to obtain the fire safety.

• 한국마이크로전자및패키징학회:학술대회논문집
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• 한국마이크로전자및패키징학회 2002년도 추계기술심포지움논문집
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• pp.153-157
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• 2002

Thermal management is very important for the success of high density circuit design in LTCC. To realized more accurate thermal analysis for structure design, a series of simple thermal resistance measurement by laser flash method and parametric numerical analysis have been carried out. The design of via filled material would be useful in thermal management of power devices.

• 한국정보통신학회:학술대회논문집
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• 한국정보통신학회 2015년도 춘계학술대회
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• pp.471-472
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• 2015

본 논문에서는 다중 도파기를 사용하여 직렬 급전 다이폴 쌍 안테나의 이득을 향상시키는 설계방법에 대하여 연구하였다. 직렬 급전 다이폴 쌍 안테나의 두 번째 다이폴 위에 스트립 형태의 도파기가 위치하며 두 번째 다이폴의 길이와 도파기의 갯수에 따른 입력 전압 정재파비(VSWR; voltage standing wave) 대역폭과 이득의 변화를 분석하였다. 1.7-2.7 GHz 대역에서 8 dBi 이상의 이득을 갖도록 최적화하였으며, 3개의 도파기를 가진다. 최적화된 안테나는 FR4 기판 상에 $86.2mm{\times}152.3mm$ 크기로 설계되었으며, VSWR < 2인 대역이 1.67-2.79 GHz이고 이득이 8 dBi 이상인 대역은 1.69-2.72 GHz이다.

• 한국전자파학회논문지
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• 제24권4호
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• pp.384-393
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• 2013

본 논문에서는 집중 소자를 이용한 광대역 평판형 마이크로파 바이어스-티의 설계를 보였다. 설계된 바이어스-티는 DC 블록과 RF 초크로 구성된다. DC 블록용 커패시터는 광대역으로 동작하는 커패시터를 사용하였고, DC 공급 및 RF 초크용 인덕터는 서로 다른 자기 공진 주파수(SRF: Self Resonance Frequency)를 가지는 인덕터들을 직렬로 연결하였다. RF 초크에서 집중 소자들의 직렬 공진에 의하여 발생하는 신호의 손실을 병렬의 저항과 커패시터를 연결하여 해결하였다. 설계된 바이어스-티는 1608 칩 형태의 집중 소자들을 이용 조립하여 제작하였다. 측정은 커넥터의 손실과 영향을 제거하기 위하여 Anritsu 3680K jig에 연결하여 측정하였다. 제작된 바이어스-티는 10 MHz~18 GHz의 광대역에서 동작하고, 측정된 반사 손실이 -15 dB 이하를 가지며, 삽입 손실은 -1.5 dB 이하인 것을 확인하였다.

• 패션비즈니스
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• 제16권4호
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• pp.152-165
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• 2012

The purpose of this study was examining the preference difference of the necktie design for the stripe patterns according to the demographic characteristics. The study method was a research study through a survey. The study subject was the adult men in their from 20's to 50's. The study stimulative was the stripe patterns of man's necktie which were made by Adobe Photoshop 9 with using the color, the arrangement, the interval, and the width of necktie. The results of study are as follows. As the difference analysis result for the color preference for stripe pattern according to the demographic characteristic, men in their 20's preferred most gray series, men whose monthly income is less than two millions won and men of owner-operator preferred most red series, and all the rest of men preferred blue series. As the difference analysis result for the preference of arrangement type, men in their 20's preferred most the stripe pattern of width, students preferred most the stripe pattern of length, all the rest of men preferred most the stripe pattern of diagonal. As the difference analysis result for the preference of stripe interval for necktie, unmarried men, students, men in their 20's, and men engaging in sales/service and production work preferred most the interval of 0.6cm, all the rest of men preferred most the interval of 1.2cm. As the difference analysis result for the preference of necktie width, unmarried men, men in their 20's, men engaging in sales/service and production work, and students preferred most the width of 7cm, all the rest of men preferred most the interval of 8cm.