• 대한전기학회:학술대회논문집
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• 대한전기학회 1994년도 하계학술대회 논문집 A
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• pp.43-45
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• 1994

This paper proposes the new method to calculate the static thrust and normal force of a hybrid type double-sided linear pulse motor by the coenergy which considered the magnetic nonlinealities. In the process of the computation, the nonlinear characteristics of the magnetic material were interpolated by the cubic spline method. And, to investigate the characteristics of the hybrid type DLPM, the static thrust and the normal force is shown as a function of displacement, input current and air airgap length. Also the simulation values are compared with the experimental ones obtained from a hybrid type DLPM.

• 한국생산제조학회지
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• 제25권4호
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• pp.307-311
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• 2016

Several types of supercapacitors have been developed for energy storage systems. Among them, the hybrid type has advantages such as a large capacitance per weight compared with the electric double-layer capacitator type. In this study, constant current charging and discharging tests were conducted for recently developed hybrid-type supercapacitors. Based on the experimental results, the capacitance and equivalent series resistance were obtained. The capacitance was larger than the designed capacitance at a low current but became small at a high current. In addition, the capacitance depended on the cell voltage. These results can be used to design an energy storage system.

• 한국초전도ㆍ저온공학회논문지
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• 제12권1호
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• pp.6-11
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• 2010

For real power system application of SFCL, it is necessary to develop an analysis model of the SFCL. In Korea, hybrid SFCL of the first half cycle non-limiting type have been jointly developed by KEPRI and LS Industrial Systems through DAPAS program. In this study, we developed a PSCAD/EMTDC analysis model of the hybrid SFCL of the first half cycle non-limiting type. The simulation results of the developed model are in agreement with the test results of the real SFCL. The developed SFCL model is tested in real power system model.

• 대한기계학회:학술대회논문집
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• 대한기계학회 2008년도 추계학술대회A
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• pp.228-233
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• 2008

The reflection type photoelastic experiment can be used more effectively than the transparent type photoelastic experiment in industrial fields. However, the reflection type photoelastic experiment for orthotropic material has not been studied. Therefore, the reflection type photoelastic experimental hybrid method for the fracture mechanics of orthotropic material was developed in this research. Comparing the results obtained from this method with those from the hybrid method for isotropic material about the same isotropic specimen, the validity of this method was verified. And then, the reflection type photoelastic experiment for orthotropic material was applied to the orthotropic plates with a central crack of the various inclined angle. Using this hybrid method for the orthotropic material, it is able to obtain stress intensity factors and separate stress components at the vicinity of the crack-tip in orthotropic plates from only the isochromatic fringe patterns of isotropic coating material.

• 한국지반신소재학회논문집
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• 제16권2호
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• pp.1-10
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• 2017

본 연구에서는 지오그리드로 보강된 사각형 복합 인공어초의 침하 및 세굴 특성을 알아보기 위해 대형 수조 침하 실험, 2차원 흐름 수조 실험 등 다양한 실내 실험을 수행하였다. 또한 인공어초의 각 배치 형태(배치도 A; 나란히 배치된 형태, 배치도 B; 지그재그로 배치된 형태)에 따른 세굴 특성을 알아보기 위해 수치해석을 수행하였다. 실내 실험 결과 무보강된 인공어초에 비해 지오그리드가 보강된 인공어초의 침하 및 세굴 깊이가 크게 저감되었다. 인공어초 배치 형태에 따른 세굴 특성을 알아보기 위한 흐름 수조 실험과 수치해석을 수행한 결과 배치도 A의 세굴 깊이와 유속 벡터는 배치도 B보다 더 감소하는 경향을 보였다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2007년도 춘계학술대회 논문집 전기기기 및 에너지변환시스템부문
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• pp.74-76
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• 2007

A hybrid optimization method is proposed for cogging torque reducing in BLDC motor. The proposed hybrid optimization method comprises a response surface method (RSM) and a gradient search method (GSM). The RSM is effective and global method in optimization problem but having large approximation error. The GSM is accurate and fast search method for optimal solution but having local behavior. To reduce approximation error and computation time a hybrid method (RSM+GSM) is proposed method. To illustrate the effectiveness of the proposed method, a comparison between conventional RSM and the proposed hybrid method is made. A simulation results verify that the hybrid method can achieve favorable design performance.

• 한국자동차공학회논문집
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• 제10권5호
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• pp.121-128
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• 2002

In this paper, the fuel economy of plug-in type hybrid electric vehicle is investigated through simulation. For the simulation study, 2 shaft type parallel hybrid powertrain is chosen and its operation modes are described. The operation algorithm which yields operation points of minimal fuel cost is suggested. Dynamic model fur operation of HEV and simulation procedure is described. Simulation results of fuel economy is compared to non plug-in type HEV as well as conventional vehicle. With total driving distance of 37km and full usage of 2kwh of electric energy stored in battery pack, plug-in type HEV shows 28-30% improved fuel economy compared to non plug-in type HEV and 86-93% improved fuel economy compared to conventional vehicle.

• 한국초전도학회:학술대회논문집
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• 한국초전도학회 2005년도 High Temperature Superconductivity Vol.XV
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• pp.96-96
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• 2005

• Nonlinear Functional Analysis and Applications
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• 제28권3호
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• pp.703-717
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• 2023

In this paper, we will introduce the notion of 𝜓-type and Jaggi type hybrid contraction in a bipolar metric space and show the existence and uniqueness of fixed point for such type of contractions. In the end, we will provide some corollaries and support our theorems by examples.

• 한국전자파학회논문지
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• 제12권5호
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• pp.810-816
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• 2001

본 논문에서는 이동 통신 시스템에서 고속의 전송데이터를 전송할 시스템을 이루기 위해 적응변조 방식을 적용한 Truncated Type-II Hybrid ARQ 방식을 제안했다. 여기서, 나카가미 페이딩 채널 환경으로 적응변조 방식을 해석하였다. 적응변조 시스템은 나카가미 페이딩 지수에 따라서 변조 레벨과 심볼율을 제어할 수 있다. E$_{b}$ /N$_{0}$가 높거나 나카가미 페이딩 지수 m이 높을 경우 이 시스템은 높은 변조 레벨과 높은 심볼율을 선택하여 전송 효율을 증가시키는데 목적이 있다. 이와 반대로, E$_{b}$ /N$_{0}$rk 낮을 경우, 전송 성능 감소를 막기 위해 낮은 변조 레벨과 낮은 심볼율을 선택한다. 변조 방법으로는 QPSK(Quadrature Phase Shift Keying), 16 QAM(Quadrature Amplitude Modulation), 64 QAM, 256 QAM을 채용하였다. Trucated Type-II Hybrid ARQ 기법에 의한 적응변조 방식은 실시간(delay-limited)처리 및 고신뢰도가 요구되는 이동 통신 및 무선데이터 통신 시스템에 적용이 가능하리라 판단된다.단된다.