재생에너지 변동성 대응을 위한 ESS 및 섹터 커플링 도입 전망 연구 전기차 활용을 중심으로

최형식 ( Choi Hyungsik ),문종우 ( Moon Jongwoo ),권필석 ( Kwon Pilseok ),최영웅 ( Choi Youngoong ),전자영 ( Jeon Jayoung ) 한국환경연구원 2023 기본연구보고서 Vol.2023 No.-

고온 초전도 케이블 시스템 설치 및 운전을 위한 연구

최형식(Choi Hyungsik),손송호(Sohn Sangho),황시돌(Hwang Sidale) 대한전기학회 2005 대한전기학회 학술대회 논문집 Vol.2005 No.7

나치의 유대인 탄압과 저항

최형식 ( Choi Hyungsik ) 한국민족연구원 2017 민족연구 Vol.0 No.70

유대인들은 진실로 나치의 압제와 위협 속에서 도살장에 끌려가는 순한 양처럼 전혀 저항하지 않고 묵묵히 도살장에 끌려간 것일까? 결론부터 말하면 그것은 진실이 아니었다. 다시 말해 유대인들은 절멸정책의 수동적인 희생자들이 아니었다. 그들은 다양한 방식으로 나치체제를 거부하였으며 스스로를 방어하였고 나아가서는 나치에 대항하여 필요한 투쟁에 목숨을 바치기도 하였다. 1933년 - 1945년 사이에 독일 유대인들이 나치에 대항하여 투쟁한 저항의 유형들을 살펴보면 유대인들은 순한 양처럼 도살장에 끌려가지 않았음을 쉽게 알 수 있다. 본 논문은 저항의 개념을 폭넓게 이해함으로써 나치체제에 대한 유대인들의 순응과 환상 그리고 저항사이에 다양한 지형이 존재하였음을 드러내며, 독일 유대인들의 태도나 행위들을 `안으로부터`의 시각에서 분석함으로써 흔히 일반화의 과정에서 놓칠 수 있는 유대인 저항의 다양성에 기초하여 유대인들이 거대한 외부의 충격과 억압에 어떻게 반응하였으며 그 역사적 의미가 무엇인지를 밝히는 것이다. 그리하여 그동안 유대인은 무기력한 희생자로, 정책의 협력자로 단순히 다루어졌다면 이제 유대인들은 다양한 모습의 행동하는 실천가로 등장하게 되었다. 사실 저항에 대한 연구는 이미 사회사가 많은 역할을 하였다. 특히 폭력투쟁을 통한 물리적 저항에 대해서는 많은 연구업적을 남겼다. 따라서 여전히 폭력의 주체에 대한 연구가 주류를 이루었다면 이제는 억압당하는 개인이나 집단들의 태도와 다양한 형태의 저항은 새로운 연구대상으로 등장하게 되었다. 이제 일상사 연구는 개별인간과 집단의 체험 그리고 개인의 기록들을 심층적으로 분석하는 작업이 억압과 공포의 사회적 시스템 속에서 그 충격을 어떻게 흡수하였으며 그리고 위기를 어떻게 경험하였는지를 드러내면서 나치시대가 체제에 대한 순응과 저항의 이분법적 관점에서는 획일적으로 파악할 수 없는, 다양하고 복합적인 것임을 보여주는 데 그 의의가 있다. This work is intended to provide an overview of the manifold forms of Jewish resistance in the Years 1933 to 1945 give. After a brief description of the historical The background to this is the differences to the general resistance movement Them. In the same chapter the Jewish resistance is related to its objectives. Moreover, the problem of the Jewish Resistance in Germany. In the next chapter the Various forms of Jewish resistance to give a comprehensive picture. In fact, there were many forms of Jewish resistance. That`s why Different questions arise. What was Jewish resistance at all? The Jews had a chance to oppose the National Socialists enforce? If so, by what means and with what success? Jewish Resistance against the Nazis--planned and spontaneous, armed and unarmed--took many forms throughout WWII and the Holocaust. For many, the resistance was a struggle for physical existence. Some escaped through legal or illegal emigration. Others hid. Those who remained, struggled to obtain life`s essentials by smuggling the food, clothing, and medicine necessary to survive. Resistance was very hazardous. In addition to the direct threat to those engaged in resistance, there was a great risk of immediate retaliation by the Nazis to the larger population after an insurrection. Jewish resistance was also threatened by assassinations, sabotage, Espionage or exile.

고온 초전도 케이블 시스템 시험 및 평가 기준(안)

최형식(Choi Hyungsik),황시돌(Hwang Sidole),손송호(Sohn Songho),임지현(Lim Jihyun) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.7

Based on the real field test of 22.9㎸ HTS cable, which is installed in Gochang Power Testing Center located in Chonbuk Province, the standard for the performance test and the quality evaluation have been established. This work will be applied to the development of HTS cable and the purchase process as a practical material. In particular, new items for the cable evaluation such as the measurement of critical current and the heat loss, which was not dealt with in conventional cable, are specified in detail.

New Construction of stable pig cell lines over-expressing porcine precursor and mature IL-18 genes

Choi, YunSil,Shim, JungHyun,Park, SangYeon,Kim, YoungKwan,Kim, EunMi,Kang, HyungSik,Yoon, Do Young,Myung, PyungKeun 충남대학교 형질전환복제돼지연구센터 2004 논문집 Vol. No.8

Exchange Rate Risk and International Investment with Regime Switching Mixed Copula

Kyuwon Choi,Hyungsik Oh 한국재무학회 2011 한국재무학회 학술대회 Vol.2011 No.05

Benefits of international diversification heavily rely on the degree of dependence across securities. In this paper, we extend the results of Garcia and Tsafack (2007) regime switching mixed copula model to include Asian countries and explain the effect of exchange rate risk on the asymmetric dependence. Bootstrapped likelihood ratio tests show that asymmetric dependence of international market appears mostly insignificant when there is no exchange rate risk, while it appears significant with the presence of exchange rate risk. We suggest unwinding of foreign investment as one possible reason for these results.

Within-District School Lotteries, District Selection, and the Average Partial Effects of School Inputs

( Eleanor Jawon Choi ),( Hyungsik Roger Moon ),( Geert Ridder ) 한국경제학회 2019 The Korean Economic Review Vol.35 No.2

This study proposes an econometric framework to consistently estimate the average partial effects (APE) of school inputs on academic achievement when students are randomly assigned to schools within each school district but endogenously sort across school districts. We illustrate our method by estimating the APE of single-sex schooling and class size on standardized test scores using data from Seoul, Korea in the period of 2008-2009. Our APE estimates are smaller than the estimates from conventional linear regressions with school district fixed effects, which do not fully correct for endogenous district choice and thus suffer from selection bias.

컨벡스 최적화 기법 기반 전기추진 수직이착륙 무인기의 추진 시스템 고장 대처를 위한 회전익 모드 믹서 설계

정연득(Yeondeuk Jung),최형식(Hyungsik Choi) 한국항공우주학회 2020 韓國航空宇宙學會誌 Vol.48 No.9

본 논문은 전기 추진 수직이착륙 무인기의 형상에 적합하도록 회전익 모드에서 추진시스템이 고장난 상황을 대처하기 위한 컨벡스 최적화 기법 기반의 믹서를 제시한다. 각 모터 및 프로펠러의 고장 영향성을 분석하기 위하여 컨벡스 함수 성질을 이용하여 가용 조종력 집합을 계산하였으며 이를 도시하는 방법을 기술하였다. 조종력 할당을 최적화 문제로 정의하고, 실시간으로 최적해를 구하기 위하여 컨벡스 함수로 문제를 재정의하였다. 컨벡스 최적화 솔버를 사용하여 수직 이착륙 비행 모드의 믹서를 구현하였으며 조종력 할당 기법들의 성능을 가용 조종력 범위 집합으로 비교하였다. 최종적으로 비선형 6자유도 시뮬레이션을 통하여 타기법(의사역행렬 기법, 재분배의사역행렬 기법)과 비교 분석하였다. An actuator mixer design using convex optimization technique situation where the propulsion system of an electric VTOL UAV during vertical take-off and landing maneuvers is proposed. The attainable control set to analyze the impact from failure of each motor and propeller can be calculated and illustrated using the properties of the convex function. The control allocation can be defined as a convex function optimization problem to obtain an optimal solution in real time. The mixer is implemented using a convex optimization solver, and the performance of the control allocation methods is compared to the attainable control set. Finally, the proposed mixer is compared with other techniques with nonlinear sux degree-of-freedom simulation.

Collision-free Autonomous Navigation of a Small UAV Using Low-cost Sensors in GPS-denied Environments

Wonkeun Youn,고하윤,Hyungsik Choi,Inho Choi,Joong-Hwan Baek,Hyun Myung 제어·로봇·시스템학회 2021 International Journal of Control, Automation, and Vol.19 No.2

This paper proposes a novel complete navigation system for autonomous flight of small unmanned aerial vehicles (UAVs) in GPS-denied environments. The hardware platform used to test the proposed algorithm is a small, custom-built UAV platform equipped with an onboard computer, RGB-D camera, 2D light detection and ranging (LiDAR), and altimeter. The error-state Kalman filter (ESKF) based on the dynamic model for low-cost IMU-driven systems is proposed, and visual odometry from the RGB-D camera and height measurement from the altimeter are fed into the measurement update process of the ESKF. The pose output of the ESKF is then integrated into the open-source simultaneous location and mapping (SLAM) algorithm for pose-graph optimization and loop closing. In addition, the computationally efficient collision-free path planning algorithm is proposed and verified through simulations. The software modules run onboard in real time with limited onboard computational capability. The indoor flight experiment demonstrates that the proposed system for small UAVs with low-cost devices can navigate without collision in fully autonomous missions while establishing accurate surrounding maps.

Mobile Widget based Advertisement System using Push Message Control

YoungSuk Kim,DongGi Yang,HyungSik Kim,ByoungCheol Choi 대한전자공학회 2008 ICEIC:International Conference on Electronics, Inf Vol.1 No.1

In this paper, we present mobile widget based advertisement system(MWAS) using push message control algorithm. Data push technology is an effective advertising scheme to synchronize or deliver information in serverdriven manner. For efficient delivery of push message, we propose push message control algorithm considering QoS class and the effectiveness of advertisement content to be delivered. We model advertising effectiveness of content with the most proper time and range of effectiveness. MWAS select and control push message using the proposed control algorithm. To protect user from the undesired advertising information, we also present mobile widget application to enable user to select the pushed advertising information. In experiment, we show simulation results of push control algorithm applying 4 different advertisement contents with 3 QoS classes and implemented widget application containing choice functionality for advertisement content.