http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
가격 기반의 에너지 저장장치 최적 운영 알고리즘 및 그 효과에 관한 연구
이하성(Ha-sung Lee),김다해(Dahae Kim),박경규(Kyung-gyu Park),곽동훈(Dong-hoon Kwak),김형수(Hyung soo Kim) 대한전기학회 2014 정보 및 제어 심포지엄 논문집 Vol.2014 No.10
에너지 저장장치는 생산된 전기를 저장하여 전력 수요가 필요할 때 방전하여 사용하는 시스템이다. 이러한 에너지 저장장치를 활용하여 한전 TOU 요금제를 기반으로한 에너지 저장장치의 최적 운영 알고리즘을 개발하고, 이 알고리즘을 적용하여 수용가에서 얻을 수 있는 전기요금 절감 효과에 대하여 분석하였다.
고해상 광학센서의 스펙트럼 응답에 따른 영상융합 기법 비교분석
이하성 ( Ha Seong Lee ),오관영 ( Kwan Young Oh ),정형섭 ( Hyung Sup Jung ) 대한원격탐사학회 2014 大韓遠隔探査學會誌 Vol.30 No.2
본 연구는 서로 다른 센서 특성을 지닌 KOMPSAT-2, QuickBird 및 WorldView-2 고해상도 위성영상에 영상융합기법을 적용하여 그 결과를 비교평가 하는 것이다. 사용된 기법은 대표적인 CS 기반 융합기법인 GIHS, GIHSA, GS1 및 Adaptive IHS를 사용하였다. 영상융합 기법의 품질평가는 시각적 분석과 정량적 분석을 수행하였으며, 정량적 분석에는 SAM, Spectral ERGAS 및 Q4을 사용하였다. KOMPSAT-2 영상은 GHISA 기법의 경우 상대적으로 우수한 성능을 나타내는 반면, QuickBird와 WorldView-2영상은 GS1기법의 경우에 우수한 성능을 나타낸다. This study aims to evaluate performance of various image fusion methods based on the spectral responses of high-resolution optical satellite sensors such as KOMPSAT-2, QuickBird and WorldView-2. The image fusion methods used in this study are GIHS, GIHSA, GS1 and AIHS. A quality evaluation of each image fusion method was performed with both quantitative and visual analysis. The quantitative analysis was carried out using spectral angle mapper index (SAM), relative global dimensional error (spectral ERGAS) and image quality index (Q4). The results indicates that the GIHSA method is slightly better than other methods for KOMPSAT-2 images. On the other hand, the GS1 method is suitable for Quickbird and WorldView-2 images.
백승엽,이하성,강동명,Baek, Seung-Yub,Lee, Ha-Sung,Gang, Dong-Myung 한국금형공학회 2008 한국금형공학회지 Vol.2 No.5
Micro Electrochemical Machining(Micro ECM) has traditionally been used in highly specialized fields such as those of the aerospace and defense industries. It is now increasingly being applied in other industries where parts with difficult-to-cut material, complex geometry and tribology such as compute. hard disk drive(HDD) are required. Pulse Electrochemical Micro-machining provides an economical and effective method for machining high strength, high tension, heat-resistant materials into complex shapes such as turbine blades of titanium and aluminum alloys. Usually aluminum alloys are used bearings to hard disk drive in computer. In order to apply aluminum alloys to bearing used in hard disk drive, this paper presents the characteristics of Micro ECM for aluminum alloy.
6063-T5 알미늄 합금의 단일과대하중에 의한 부식피로균열진전거동에 관한 연구
강동명,이하성,우창기 한국산업안전학회 1997 한국안전학회지 Vol.12 No.3
6063-T5 alloys are tested in laboratory air, water and 3%% NaCl solution to investigate the effects of corrosive environment on the retardation behavior through single overload fatigue test. Also, the fatigue crack propagation and the crack closure behavior are studied. The results obtained in this experimental study are summarized as follows : 1) Behaviors of fatigue crack growth retardation are observed in water and 3% NaCl solution as they do in air. The number of delay cycles and the size of affected region by single overload decrease greatly in water and 3% NaCl compared with those in air. 2) In fractographic results, the overload marking by single overload appear remarkably in air, but indistinctly in water and 3% NaCl solution. 3) The effect of crack closure on crack propagation is most remarkable in the beginning of crack propagation. With crack propagation, the crack closure level and its effect decrease greatly.
용접부의 인장 및 압축잔류응력에 관한 피로균열 전파거동
강동명,이하성 한국산업안전학회 1994 한국안전학회지 Vol.9 No.3
Effects of tensile and compression residual stresses in the welded SS41 and Al7075-T6 on fatigue crack propagation behavior are investigated when a crack propagates from residual stresses region. We propose the fatigue crack growth equation on tensile and compression residual stresses in welded metal. The results obtained in this experimental study are summarized as follows : 1) A fatigue crack growth equation which applied fatigue fracture behavior of the welded metal is proposed. (수식) where, α, β, γ and δ are constants, and R_(eff) is effective stress ratio [R_(eff)=(K_(min)+K_(res))/(K_(max)+K_(res)], K_(ef) is critical fatigue stress intensity factor. The constants are obtained from nonlinear least square method. The relation between crack length and number of cycles obtained by integrating the fatigue crack growth rate equation is in agreement with the experimental data. 2) The experimental results confirmed that the cause of crack extension and retardation by residual stresses has relation to the phenomenon of crack closure. 3) The relaxing trend of residual stresses by the crack propagation was greater in case of compressive residual stress than that of tensile residual stress in the welded metal.