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Sungcheol Kim(Sungcheol Kim),Kyunghun Kim(Kyunghun Kim) 세종대학교 경제통합연구소 2023 Journal of Economic Integration Vol.38 No.1
This paper investigates the key factors in determining disaggregated portfolio investment flows to Korea. I categorize total portfolio investment flows by investor type, such as global banks, investment funds, securities firms, and pension companies. From the structural vector autoregression model with dummy variables, this paper finds that the properties of each institution's capital inflows are quite different. For example, investment funds and securities firm flows are more responsive to stock market index, whereas pension companies are more sensitive to domestic output growth. This implies that the impact of any economic shock on the total foreign capital flows cannot be generalized as the impact on each investment group's capital flow.
[가솔린엔진부문] 잔류가스 추정 기법을 이용한 EGR율의 예측
김성철(Sungcheol Kim),이상진(SangJin Lee),김득상(Duksang Kim),엄인용(Inyong Ohm),조용석(Yong-Seok Cho) 한국자동차공학회 2001 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2001 No.11_1
Residual gas acts as a diluent which results in reducing the in-cylinder temperature as well as the flame speed, significantly affecting fuel economy, NOx emissions and combustion stability. Therefore it is important to determine the residual gas fraction as a function of the engine operating parameters accurately. However, the determination of the residual gas fraction is very sophisticated due to the unsteady state of induction and exhaust process. There has been little work toward the development of a generally applicable model for quantitative predictions of residual gas fraction
Hyeseon Chae,Sungcheol Kim,Kwanwoo Kim,Kyungsuk Lee,Hoycher Kim,Keunsang Park 대한인간공학회 2011 大韓人間工學會誌 Vol.30 No.6
Objective: The purpose of this study is to assess the reducing effect of workload on developed electro-motion scissors. Methods: To achieve this, we measured the pressure distribution, Joint angle of fingers and JSI(Job Strain Index) for electro-motion scissors and hand-operated scissor in objective assessment and surveyed the uncomfortable degree in subjective assessment. Results: As a result, The peak of pressure in the electro-motion scissors was generally lower than the hand-operated scissors. JSI and overall joint angle of fingers for the electro-motion scissors were remarkably lower than the hand-operated scissors. Also, the subjective uncomfortable degree showed that the uncomfortable point of electro-motion scissors were generally lower than the hand operated scissors. Conclusion: The impact of reducing the work load as well as distributing the pressure around the hand by using electro-motion scissors during grapes pinching was confirmed.
김재환(Jaehwan Kim),양상렬(Sang Yeol Yang),장상동(Sang-Dong Jang),고현우(Hyun-U Ko),문성철(Sungcheol Mun),김동구(Donggu Kim),강진호(Jinho Kang) 대한기계학회 2012 大韓機械學會論文集B Vol.36 No.5
셀룰로오스 EAPap 작동기는 생체 모방형 작동기의 하나로 생체적합하고 가볍고 비교적 낮은 전압에서도 큰 변위를 발생시킨다는 장점을 가지고 있다. 셀룰로오스를 재생하면서 셀룰로오스 파이버를 배열함으로써 압전 종이를 만들었다. 한편 셀룰로오스에 탄소나노튜브, 산화금속 나노분말, 전도성 고분자, 이온성 유체등을 물리적, 화학적으로 결합시켜 다양한 하이브리드 나노복합재를 만들었다. 본 논문에서는 셀룰로오스 EAPap 의 제조공정 및 이를 응용한 바이오센서, 화학센서, 유연트랜지스터, 그리고 작동기의 응용 디바이스에 대해 소개한다. 또한 셀룰로오스 EAPap을 무선으로 구동하는 기술에 대해 소개한다. 이는 생체모방로봇, 정찰 등에 활용될 수 있다. Cellulose Electro-Active Paper (EAPap) is attractive as a biomimetic actuator because of its merits: it is lightweight, operates in dry conditions, has a large displacement output, has a low actuation voltage, and has low power consumption. Cellulose is regenerated so as to align its microfibrils, which results in a piezoelectric paper. When chemically bonded and mixed with carbon nanotubes, titanium oxide, zinc oxide, tin oxides, the cellulose EAPap can be used as a hybrid nanocomposite that has versatile properties and that can meet the requirements of many application devices. This paper presents trends in recent research on the cellulose EAPap, mainly on material preparation and its use in devices, including biosensors, chemical sensors, flexible transistors, and actuators. This paper also explains wirelessly driving technology for the cellulose EAPap, which is attractive for use in biomimetic robotics and micro-aerial vehicles.
김병철(Byeongcheol Kim),김창진(Changjin Kim),윤성철(Sungcheol Yun),한경숙(Kyungsook Han) 한국컴퓨터정보학회 2018 韓國컴퓨터情報學會論文誌 Vol.23 No.12
In this paper, we implemented a static analysis tool for weakness. We implemented on JavaCC using syntax information and control flow information among various information. We also tested the performance of the tool using Juliet-test suite on Eclipse. We were classified using information necessary for diagnosis and diagnostic methods were studied and implemented. By mapping the information obtained at each compiler phase the security weakness, we expected to link the diagnostic method with the program analysis information to the security weakness. In the future, we will extend to implement diagnostic tools using other analysis information.