• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2004년도 하계학술대회 논문집 Vol.5 No.2
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• pp.710-713
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• 2004

The design, simulation, modeling and measurement of a low temperature co-fired ceramic (LTCC) RF switch module for GSM applications is presented in this paper. RF switch module is constructed using a Rx/Tx switching circuit and integrated low pass filter. The low pass filter function was designed to operate in th GSM band. Insertion and return loss of the low pass filter were designed less than 0.3 dB and better than 12.7 dB at 900 MHz. The RF switch module contained 10 embedded passives and 3 surface mount components integrated on $4.6{\times}4.8{\times}1.2$ nm, 6-layer multi-layer integrated circuit. The insertion loss of switch module was measured at 900 MHz was 11 dB.

• 한국해양공학회지
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• 제28권5호
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• pp.404-410
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• 2014

The purpose of this study was to find the optimal arrangement of FPSO equipment in a module while considering the economic value and fire risk. We estimated the economic value using the pipe connections and pump installation cost in an HP (high pressure) gas compression module. The equipment risks were also analyzed using fire scenarios based on historical data. To consider the wind effect during a fire accident, fuzzy modeling was applied to improve the accuracy of the analysis. The objective functions consisted of the economic value and fire risk, and the constraints were the equipment maintenance and weight balance of the module. We generated a Pareto-optimal front group using a multi-objective GA (genetic algorithm) and suggested an equipment arrangement method that included the opinions of the designer.

• 한국태양에너지학회:학술대회논문집
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• 한국태양에너지학회 2011년도 추계학술발표대회 논문집
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• pp.239-244
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• 2011

In this paper, we analyzed the electrical characteristics with crack pattern in crystalline solar cell. crystalline solar cells with a thin substrate, even small shocks can be easily damaged. Before the module goes through many processes, because the solar cells are at risk of a crack. That occurred early in the PV module micro-crack is not easily detection by eye test or output test. Because the EL (Electroluminescence) device has been detected using. PV module is made by laminated of a variety of materials. By different properties of each material will affect the crack. For this reason, the crack will grow and affect the output. And We analyzed the three crack patterns in crystalline solar cell. A growth of cracks on crystalline solar cell was interpreted by analysing generated cracks on the PV modules. Based on this interpretation, an electrical output value was calculated by mathematical modeling on electrical output characteristic with each crack patterns.

• 한국정보통신학회논문지
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• 제24권6호
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• pp.809-817
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• 2020

소형위성 전력분배 및 전송모듈의 설계와 개발과정에서 딥러닝 알고리즘으로 동적 전력자원의 안정성을 평가하였다. 안정성 평가에 따른 요구사항은 소형위성 탑재체인 SAR 레이더의 전력분배모듈과 수요모듈의 전력전송기능을 구성하였다. 전력모듈인 PDM을 구성하는 스위칭 전력부품의 성능확인을 위해 동적신경망을 활용하여 신뢰성을 검증하였다. 신뢰성 검증을 위한 딥러닝 적용대상은 소형위성 본체로부터 공급되는 전력에 대한 탑재체의 전력분배기능이다. 이 기능에 대한 성능확인을 위한 모델링 대상은 출력전압변화추이(Slew Rate Control), 전압오류(Voltage Error), 부하특성(Load Power)이다. 이를 위해 첫째, 모델링으로 Coefficient Structure 영역을 정의하고 PCB모듈을 제작하여 안정성과 신뢰성을 비교 평가하였다. 둘째, 딥러닝 알고리즘으로 Levenberg-Marquare기반의 Two-Way NARX신경망 Sigmoid Transfer를 사용하였다.

• 한국태양에너지학회:학술대회논문집
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• 한국태양에너지학회 2011년도 추계학술발표대회 논문집
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• pp.143-148
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• 2011

This paper is about the study on MPPT algorithm of PV module where mismatched solar cells exist. PSIM simulation tool was used to verify new MPPT algorithm and PV module modeling was made. It was verified for the proposed algorithm to track the right MPP of PV boost converter under mismatched condition, which shows a shading effect in PV module. An experiment will be done soon using PV simulator for verification of the proposed algorithm.

• 한국정보디스플레이학회:학술대회논문집
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• 한국정보디스플레이학회 2006년도 6th International Meeting on Information Display
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• pp.1436-1441
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• 2006

Each type of optical sheets in a LCD module experiences a characteristic behavior for thermal loading and unloading. During thermal cycling, a polymeric behavior is reversible and recyclable, depending on a material stiffness critically affected by temperature and time. Some critical issues on temperature- and time-dependent themomechanical deformation of the polymeric sheet are addressed by finite-element thermal results, followed by structural simulation results in this study.

• 조명전기설비학회논문지
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• 제19권3호
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• pp.93-98
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• 2005

근거리에서의 무선설비제어, 구내음성통신과 같은 전파통신설비의 송수신 모듈에 실리콘 바이폴라 트랜지스터가 많이 사용되고 있다. 이러한 실리콘 바이폴라 트랜지스터의 내부 전류원에 대한 새로운 모델링 방법이 제시되었다. 제안된 방법은 Si-BJT의 새로운 열 저항 추출방법과 전류원 파라메터에 대한 새로운 해석적인 방정식에 기반을 두고 있다. 이 방법은 기존의 방법에서 채택된 반복적인 최적화 과정 없이 바로 파라메터를 구할 수 있다. 제안된 방법을 5개의 핑거를 가지는 $0.4\times20[{\mu}m^2]$ 의 Si-BJT에 이 방법을 적용시켰으며, 모델링된 데이터는 측정결과를 $3[\%]$ 이내의 오차로 잘 예측하였다.

• 한국BIM학회 논문집
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• 제4권3호
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• pp.1-9
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• 2014

As BIM application continues to increase in civil engineering, in this study, 3D information model for RC(Reinforced Concrete) bridge pylon was developed and verified its effectiveness at the structural-design stage. To define 3D information model of RC A-Type pylon, characteristics of pylon were analyzed and 3D model structure was constructed. The 3D information model, one of the core product of BIM, manages all information generated during all life-cycle of a structure and consequently maximizes the efficiency of utilizing information. Also, this study proposes interface module between input data in structural analysis and 3D model of RC pylon. The module can create the input data for non-linear structural analysis. It is essential to study on method of developing 3D information model and propose a structural analysis model by utilizing 3D model for the effective use of BIM techniques in construction industry. The results of this study can be used as the base data for developing the 3D information model of RC pylon in the structural analysis field.

• 전기학회논문지
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• 제56권12호
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• pp.2098-2102
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• 2007

The conventional CCPU(Cable Covering Protective Unit) modeling methods which are used by Type 99 and Type 92 in EMTP simulation are firstly discussed in this paper, and then some problems of them are also investigated. Modeling method using Type 99 causes unstable characteristic at initial transient of CCPU operation. Time delay has also effect on the output of CCPU modeling. So, in this paper, a new modeling method for CCPU is designed by DBM(Data Base Module) of EMTP. The characteristic of Type 92 is used for the new modeling method. The reliability of this one is proved by comparing simulation with measured data. Specially, at initial transient, the waveform of the new method shows more stable result than that of conventional method using Type 99. Also, the peak value is similar to measured data.

• 한국게임학회 논문지
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• 제9권2호
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• pp.95-104
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• 2009

DirectX를 사용하는 윈도우 게임 및 콘솔 게임은 전 세계 게임 시장의 20% 이상을 차지하고 있으며, 전 세계 시장의 75% 이상이 C++로 개발되고 있다. 본 연구는 DirectX와 C++ 기반으로 개발된 20개 프로젝트 코드의 공통성과 가변성을 분석하여 패턴화하고, 이를 공통 모듈화 하였으며, 이 모듈을 모형화 하였다. 사례 연구를 통해, 제안한 기법을 사용하여 DirectX와 C++ 기반으로 개발된 소프트웨어 코드의 생산성이 60% 이상 개선됨을 입증하였다.