심부 석탄층 탐사에 있어서 CSAMT 탐사법 적용

정승환,김정호,전정수,Chung, Seung-Hwan,Kim, Jung-Ho,Jeon, Jeong-Soo 대한자원환경지질학회 1990 자원환경지질 Vol.23 No.1

Controlled source audio-frequency magnetotelluric (CSAMT) has the great advantage of efficient mapping resistivity distribution and relatively deep depth of investigation. Moreover, CSAMT may be regarded more attractive than audio-frequency magnetotelluric in the sense of the strong and controllable signal. However, it has the problem such as undershoot and/or near-field effect that is hard to be interpreted if the interpretation method of MT is directly applied. The problem arises from the existance of controlled source which makes CSAMT attractive. So the characteristics of CSAMT response should be thoroughly understood prior to interpretation stage. In this study, numerical modeling program for horizontally layered earth was developped for the interpretation of CSAMT field data. CSAMT field survey was run as a follow-up to resistivity dipole-dipole study over the same survey line at Bongmyung coal mine. The survey used a grounded dipole source 2 Km in length and located 7.5Km south in this study. A good agreement between field CSAMT data and calculated data was demonstrated even in geologically complex earth situations.

태양광 발전 시스템에서의 벅 컨버터 모델링과 해석

정승환,최익,최주엽,Jung, Seung-Hwan,Choy, Ick,Choi, Ju-Yeop 한국전자통신학회 2013 한국전자통신학회 논문지 Vol.8 No.7

Generally, the buck converter controller was designed to control output voltage of the converter. However, design of the controller in photovoltaic power conditioning system is different from general design. the controller in photovoltaic power conditioning system controls input voltage of the converter(output voltage of the solar cell) for MPPT(Maximum Power Point Tracking). This paper proposes novel buck converter model which can control input voltage of the converter. We integrate this model with a model of solar cell. and linearize at the operating point(MPP). In addition, we determine whether or not suitable for the general linear controller design into small and large signal analysis. 일반적으로 벅 컨버터 제어기는 컨버터의 출력 전압을 제어하도록 설계하지만, 태양광발전시스템에서의 벅 컨버터 제어기는 설계 방식을 달리 구분해야 한다. 본 논문에서는 MPPT(Maximum Power Point Tracking)을 위하여 벅 컨버터의 입력 전압(태양광전지의 출력 전압)을 제어한다고 가정하였다. 또한, 컨버터의 입력 전압을 제어하기 위한 새로운 벅 컨버터 모델을 제시한다. 이 컨버터 모델은 최대전력점(MPP)에서 동작점을 두어 선형화한 태양광전지의 모델을 포함하며, 모델의 타당성을 검증하기 위하여 대신호와 소신호로 나누어 분석한다. 또한 일반적인 선형제어기를 설계하였을 때, 제어 가능성을 분석하여 검증한다.

적분 이득의 비선형 적응 백스텝핑 제어 기법을 적용한 IPMSM의 속도 제어

정승환,최익,전용호,Jung, Seung-Hwan,Choy, Ick,Jeon, Yong-Ho 한국전자통신학회 2013 한국전자통신학회 논문지 Vol.8 No.6

본 논문은 IPMSM(Interior Permanent Magnet Synchronous Motor)의 속도 제어를 위한 비선형 백스텝핑 제어 기법을 제안한다. 비선형 백스텝핑 제어기법의 이득은 정상상태 에러를 제거하고, 좀 더 안정한 결과를 얻을 수 있도록 에러의 적분 이득을 포함하여 설계하였다. 또한, 부하 토크를 추정할 수 있도록 설계하여 부하의 변동에 대하여 빠른 적응성을 가지도록 하였다. 모의 실험을 통하여 적분 이득을 가지는 백스텝핑 제어기가 일정한 토크 운전영역에서 안정한 제어기임을 검증하고, 적분 이득이 없는 백스텝핑 제어기와 성능을 비교하였다. In this paper, a nonlinear and adaptive back-stepping control technique is proposed for a speed control of IPMSM(Interior Permanent Magnet Synchronous Motor). The gain of back-stepping controller(including integral value of the states error) is designed for stability of the system. In order to adapting fast in variation of load torque, the controller is including load torque estimator. The simulation is completed by using PSIM software. The simulation results show that the designed back-stepping controller make the system stable in the constant torque region, and has better tracking performance than a controller without the integral gain.

북한의 형사사법절차에 대한 체제 내외적 평가 -미국 여기자 억류사건을 중심으로

정승환 ( Seung Hwan Jung ) 안암법학회 2010 안암 법학 Vol.0 No.32

On 17 March, 2009, North Korean boader guards detained two American journalists after they crossed into North Korea from China without a visa. Despite vigils for two journalists throughout the United States, they were not released. Rather, they were found guilty of illegal entry and hostile acts and sentenced to twelve years hard labor in June 2009. North Korean leader Kim Jong-il pardoned the two on August 5, 2009, the day after former U.S. President Bill Clinton arrived in the country on a publicly unannounced visit as a special envoy. It is worth nothing that North Korea has shown quite a different stance on this case comparing its previous practices. Pyongyang has reported in detail about the ongoing situations of the affair; on 21 March, 2009, the Korean Central News Agency (KCNA), the state news agency of North Korea, announced that two journalists were in the investigation process; On March 30, it reported that preparations were under way for indictments and a trial, saying, "The illegal entry of US reporters into the DPRK (Democratic People`s Republic of Korea) and their suspected hostile acts have been confirmed by evidence and their statements." It clearly demonstrates that North Korea wanted to show the world that it actually follows the rules of its own legal system as well as those of the international one. The purpose of this article is to analyze the criminal judicial system of North Korea and evaluated it from the perspective in and out of the system of the country with respect to the case mentioned above. This article takes a close look on whether Pyongyang observed its own criminal laws based on the legal system of North Korea, and whether it established the criminal laws fulfilling the international standards on the criminal laws and criminal judicial procedures. The examination leads to the conclusion that considering this case North Korea neither complied with its own laws nor satisfied the international standards. In other words, this case has proved that the criminal judicial procedures of North Korea are nothing but hollow and all depend on the political situation in and out of the country.

온라인 커뮤니티에서의 친목질 측정도구 개발

정승환(Seung-Hwan Jung),김신우(Shinwoo Kim),조희숙(Heesouk Cho) 한국디지털콘텐츠학회 2020 한국디지털콘텐츠학회논문지 Vol.21 No.2

적분 이득의 비선형 백스텝핑 제어 기법을 적용한 IPMSM의 속도 제어

정승환(Seung-Hwan Jung),전용호(Yong-Ho Jeon),최익(Ick Choy),조황(Whang Cho) 대한전기학회 2013 대한전기학회 학술대회 논문집 Vol.2013 No.7

서구 행형의 역사와 한국의 행형

정승환(Jung Seung-Hwan) 한국형사법무정책연구원 2002 형사정책연구 Vol.49 No.-

자기결정성이론의 HRD 적용에 대한 논의

정승환 ( Seung Hwan Jung ),장형심 ( Hyung Shim Jang ) 한국인력개발학회 2015 HRD연구 Vol.17 No.3

동기이론 중 하나인 자기결정성이론(self-determination theory)에 따르면, 인간은 심리적인 성장과 통합을 향하여 능동적으로 자아(self)를 발달시키려는 유기체적 존재이다. 본 연구는 자기결정성이론을 바탕으로, HRD 적용에 대한 시사점을 논의하기 위해 작성되었다. 먼저 자기결정성이론의 다섯 가지 미니이론인 인지평가이론(cognitive evaluation theory), 유기통합이론(organismic integration theory), 인과지향이론(causality orientation theory), 기본심리욕구이론(basic psychological needs theory, 목표내용이론의(goal content theory) 기본가정과 핵심적인 내용에 대하여 기술하였다. 이를 통해 자기결정성이론의 여섯 가지 HRD 적용점을 제시하였다. 첫째, 자율적 인간관에 대하여 강조하였다. 구체적으로 자율성과 성과와의 관계, 자율성과 독립성과의 관계를 기술하였다. 둘째, 외재적 보상을 재고할 것을 제안하였다. 구체적으로 외재적 보상의 효과와 보상의 숨겨진 대가에 대하여 설명하였다. 셋째, 자율성을 촉진하는 환경에 대해 논의하였다. 넷째, 유능성 증진을 위한 피드백의 역할에 대해 설명하였다. 구체적으로 유능성에 대한 진보를 자각하는 것과, 유능성과 칭찬의 관계에 대하여 설명하였다. 다섯째, 조직가치의 동일시와 통합에 대하여 논의하였다. 마지막으로 심리적 욕구와 조직 리더의 관계에 대하여 논하였다. In the self-determination theory, the human beings are those who want to develop themselves actively through the psychological growth and integration. The purpose of this study to discuss the implications for HRD based on the self-determination theory. Above all, basic assumptions and critical points of five mini-theories(cognitive evaluation theory, organismic integration theory, causality orientation theory, basic psychological needs theory and goal content theory) of self-determination theory were described. Through those, the six critical points of self-determination theory were proposed to HRD application. First, we emphasized the view of autonomous human nature. Specifically, we described the relationship between the autonomy and performance, and the relationship between autonomy and independence. Second, we proposed to reconsider the extrinsic rewards and explained the hidden cost of reward. Third, we discussed the environment to promote autonomy. Fourth, we described the role of feedback promoting competence. Specifically, we explained the awareness of progressive competence, and the relationship between the competence and praise. Fifth, we discussed the integration and identification of organizational values. Finally, we demonstrated the relationship between psychological needs and organizational leaders.

Ge-68/Ga-68 Rod Sources을 이용한 방사능측정기의 정도관리

정승환(Seung Hwan Jung),진계환(Gye Hwan Jin) 한국방사선학회 2018 한국방사선학회 논문지 Vol.12 No.5

PET와 PET/CT의 검사 영상품질관리를 위해서는 F-18 방사능측정기의 정도관리가 필요하다. Ge-68/Ga-68 Rod Sources을 선원을 이용하여 의료기관에서 사용하고 있는 5종류의 방사능측정기의 방사능 측정의 정확 도와 정밀도를 확인하였다. CRC-15R, CRC-15 PET, CRC-712M, CRC-15 베타 및 CRC-25PET에 대한 측정값과 기준값 사이의 방사능 양에 따른 상관관계는 0.99999 (P <0.0001)로 매우 높은 선형성을 보였다. 정확도 테스트에서 CRC-15R, CRC-15 PET, CRC-712M, CRC-15 베타 및 CRC-25PET 모델은 각각 -3.232 %, -1.342 %, -2.815 %, -2.913 % 및 -3.089 %를 이었다. 국내와 국제기준인 정확도 ±10%, 정밀도 ±5% 이내로 기준을 만족하였고 반감기가 짧은 F-18에 비하여 경제성 있고 비교적 긴 기간 동안 안정적으로 정도관리가 가능하 다는 것을 확인하였다. This article compared accuracy of 5 types of radionuclide activity meters that are being used in medical institutions and proposed the correction factor for each radionuclide activity meters type, using Ge‐68/Ga‐68 radiation sources for scanner setting, regular scanner correction, attenuation correction, and normalization. The calibration constant between baseline values and measured values by CRC-15R, CRC-15 PET, CRC-712M, CRC-15 Beta, and CRC-25PET was 0.99999(P<0.0001), which showed very high linearity. In the accuracy test, CRC-15R, CRC-15 PET, CRC-712M, CRC-15 Beta, and CRC-25PET model showed -3.232%, -1.342%, -2.815%, -2.913%, and -3.089% respectively.

태양광발전시스템에서의 벅 컨버터 모델링

정승환(Jung Seung-Hwan),최익(Choy Ick),임지훈(Im Ji-Hoon),최주엽(Choi Ju-Yeop),송승호(Song Seung-Ho),안진웅(An Jin-ung),이동하(Lee Dong-Ha) 한국태양에너지학회 2010 한국태양에너지학회 학술대회논문집 Vol.2010 No.4

modelling of the buck converter in photovoltaic power conditioning system is not a possibility of doing with input-output relationship from existing procedures. Because the input current and voltage of the buck converter in fluctuate at any time. The controller which design with the method which has like this error cannot have a good efficiency. In this paper, in order to design accurate controller of buck converter, solar cell model and buck converter model is proposed. and buck converter modeling used a state-space averaging method.