Optical Feedback 방식에 의한 Laser Diode의 출력 안정화

정의진,이성은,강민호,Jeong, Ui-Jin,Lee, Seong-Eun,Gang, Min-Ho 대한전자공학회 1980 전자공학회지 Vol.17 No.6

본 논문에서는 optical feedback prebias control 회로상의 몇가지 일반적인 문제점들을 분석하고 이에 수반되는 회로 조정의 문제를 해결하기 위하여 LD simulation 회로를 제시하였다. 온도 시험에서 LD의 총 light power를 feedback loop에 사용하였을 때 0℃부터 36℃까지의 사이에서 1.5%의 light power 감소를 보였고 star coupler를 beam splitter로 1%정도를 분지, feedback loop에 사용한 결과 transmitter로서 좋은 전송 특성을 가짐을 관찰하였다. We analyze several problems concerning the operation of the optical feedback prebias control scheme in the loser diode optical transmitter and present a LD simulation circuit as a way of adjusting the component's optimum value without using the Laser - triode. 1.5% light power decrease was observed between the temperature range of $0^{\circ}C$ and 36$^{\circ}C$ in which the total light power of LD was used for feedback loop and fairly good operation was demonstrated when a star coupler was employed as a beamsplitter by which approximately 1% portion of the light power was feedbacked.

학생들의 역사 텍스트 읽기에서 나타난 상호텍스트성 분석

정의진 ( Jeong¸ Ui-jin ) 역사교육학회 2021 역사교육논집 Vol.78 No.-

This study shows how students read and understand historical texts on the basis of intertextuality. The students in this study wrote on the Independence Club(독립협회) and the act of dissolution by King of Gojong (고종). Most of them often relied on textbooks when writing. But some of them tended to use the internet for further, detailed information about topics, not referring to the books they had read, such a reliable source of knowledge. And they were rather attracted to the opinions opposing to what they had already known without cross-checking multiple sources. Most of the students recognized that each text they read adopts its own different perspectives or interpretations. But they failed to distinguish between the facts and the interpretations included in the texts. Some of them constructed their own narratives by filling the knowledge gaps with false information and even envisaged the aims and purposes of historical characters. A few of them were found just copying what a textbook says, or writing nothing, to clear up the confusion they were having. Most of the students, influenced by the social environment or context, interpreted the given topic with the frame of democracy versus dictatorship. Those who considered the direction of the Independence Club(독립협회) as democracy often claimed that democracy should be established. Also they believed that democracy is a natural condition for all human races. However, when seeing that democracy would be difficult to realize, some of them doubted and denied the possibility of democracy ironically. Even though the national curriculum, textbooks, and teachers’ classes were well structured, the students did not accept as intended.

역사 수업에서 나타난 교사의 행위주체성

정의진(Uijin Jeong) 한국역사교육학회 2022 역사교육연구 Vol.- No.44

본 연구의 목적은 역사 교사들이 수업에서 어떻게 행위주체성을 발휘하는지를 살펴보기 위해서이다. 연구 참여자인 세 명의 교사는 과거 개인적 경험과 교사로서의 경험, 미래의 수업에 대한 자신의 지향점이 현재의 조건 속에서 어떻게 극복, 회피, 타협, 우회하는지를 보여주고 있다. A 교사는 과거 역사적 사건과 현재 학생들의 시간적 거리(temporal distance)를 줄이는 전략을 사용하고 역사적 피해자에 대한 공감을 중요하게 생각하였으며 B 교사는 과거를 현재와 연결하는 것에 중점을 두었다. C 교사는 학생들이 자료에 근거하여 역사를 읽도록 하였지만, 과거와 현재의 문제를 연결하는 것이 중요하다고 생각하였다. 세 명의 교사들은 모두 역사적 맥락화를 중요하게 생각하였으며 맥락화라는 용어를 자신의 수업에서 각자 다른 방식으로 구현하였다. 또한 이들은 다양한 시점과 주체의 입장에서 역사를 바라보는 다관점을 반영한 질문을 사용하였다. 교사들은 보수와 진보의 역사 전쟁이라는 시기를 겪어오면서 학생들의 정체성과 감정을 자극하는 현대사를 다룰 때 누구나 인정하여 부정할 수 없는 사실을 다루기도 하였다. 이들은 과거와 현재의 문제를 연결하여 다루거나 때로는 학생들에게 제시하는 질문의 형태를 단순화하기도 하였다. 이는 역사를 맥락에서 벗어나게 하여 비(非)역사적인 것이 될 수 있는 위험성을 가지고 있었다. 그러나 이러한 교사들의 시도를 ‘비(非)역사적’이라거나 ‘현재주의’라는 말로 뭉뚱그려 비판하는 것은 전체적인 맥락 속에서 교사의 수업을 바라보지 않는다는 문제점과 함께 역사 수업의 다양한 가능성을 축소한다. 따라서 과거와 현재를 연결하는 역사 수업을 어떻게 하면 성공적으로 이끌 수 있는지에 대한 고민과 논의가 이어져야 한다. 또한 교사들은 선악 구도의 도덕적인 가치와 윤리적인 측면을 강조하는 것이 역사교육의 대상인 역사학의 목적을 훼손할 수도 있음을 잘 알고 있었다. 그런데도 교사들은 도덕적인 가치로 조망하는 것이 적합하다고 생각하는 주제가 있다고 보았다. 이는 교사들이 위치한 시대와 사회가 직면한 윤리적 가치에 대한 의문을 제기하도록 한다. This case study covering three history teachers is trying to analyze how history teachers present agency in their teaching. Research participants, based on their experience as teachers or personal experience, who are with future goals and direction under the current situation, show how these elements interacted and how they are overcoming, deviating, compromising, and taking a detour when facing the challenge. For teacher A, it is valuable to teach to feel sympathy through history by using the teaching strategy like reducing the temporal distance between the past(historical event) and present(student stand on). Teacher B used to emphasize the link between past and present. Like B, Teacher C focused on connecting past events with current affairs and led his students to experience many kinds of historical material. Those who valued historical contextualization as one of the most important goals of teaching implemented it in their way. They also used questions that reflected on multiperspective from various viewpoints and scores of subjects. When they deal with contemporary history that is often provoking strong emotion and identity of students, those who experienced the period of so-called “history war” deviate it using historical facts which everyone approves of regardless of their party, identity, etc. All of them dealt with the past events by joining the current affair, sometimes somewhat simplifying the questions given to students. Their attempts always include several risks which might make its historical context de-contextualize. But if we blame these attempts in the lump as un[non]historical teaching or presentism it would not be thought to be the teacher’s teaching in the whole context and minimize diverse possibilities of history teaching. More than that, we should ask the following question “what do we have to do to reduce these risks?” But these problems don’t originally come from the essential limitation on the kind of questions. They also know well that focusing on moral perspectives and ethical dimensions against historical events might damage the aims of history. Though recognizing the limitations, they think that some of the history topics covered in their class are very suitable for moral perspectives that are often opposed to history and historiography. This point interestingly calls attention to a series of ethical problems in the society and period we now live.

CNN구조를 이용한 Starcraft II 미니게임 모방학습

정의진(Euijin Jeong),김경중(Kyung-Joong Kim) 한국정보과학회 2019 한국정보과학회 학술발표논문집 Vol.2019 No.12

열차제어시스템 소프트웨어 Metric 분석 자동화도구 개발

황종규(Hwang Jong-gyu),조현정(Jo Hyun-jeong),정의진(Jeong Eui-jeong),김용규(Kim Yong-gyu) 한국철도학회 2008 한국철도학회 학술발표대회논문집 Vol.- No.-

Recent advances in embedded system technology have brought more dependence on automating train control. While much efforts have been reported to improve electronic hardware"s safety, not so much systematic approaches to evaluate software"s safety, especially for the vital software running on board train controllers. In this paper, we have developed a software testing tool to evaluate train control system software safety, expecially "Metric Analysis" module. We have reviewed requirements in the international standards and surveyed available tools in the market. From this, we identified the S/W metric analysis module is required for software evaluation. So we have developed S/W metric analysis modulefor railway signaling systems.

철도소프트웨어에 대한 프로세스 성숙도 적용 연구

정의진(Eui-jin Joung),신경호(Kyung-ho Shin),이강미(Kang-mi Lee),조현정(Hyun-jeong Cho) 한국철도학회 2006 한국철도학회 학술발표대회논문집 Vol.- No.-

The softwares in a railway system are being used in the area of railway control system, directly associated to safety, as well as in the field of data collection or database, which is not related to safety. Also the software takes the form of □□Embedded□□ that let it behave at the level of system, instead of independent operation. Consequently, it can be considered that the safety of software is combined with that of hardware, and also directly connected to system safety. The approach, for ensuring the quality and safety of those software, can be considered with two points of view. Those are views seeing from products, and from processes. The former one is to check the states of the finally launched products, rather than to examine the manufacturing processes and work forces, the latter approach assumes that the process maturity should be based to make good quality and sound software. The product approach is to check the safety of products by performing proper tests (White Box or Black Box test) to developed products depending on each Lifecycle, and the process approach is to validate maturity of the organizations in accordance to the judging processes of organizations, which are specified by CMMI(Capability Maturity Model Integration) or SPICE(Software Process Improvement and Capability dEtermination : ISO/IEC15504). The two points of approach are all necessary in the railway system. In this paper, as the first step of them, we are trying to find approaches to estimate the maturity of manufacturer and assessment organization in the railway system.

도시철도 신호시스템의 절체에 따른 주파수 간섭 연구

정락교(Jeong, Rag-Gyo),김백현(Kim, Baek-Hyun),정의진(Joung, Eui-Jin) 한국산학기술학회 2010 한국산학기술학회논문지 Vol.11 No.2

철도신호시스템은 열차들의 운행간격과 열차진로를 제어하는 기능을 담당함으로써 열차를 안전하고 효율적 으로 운영하는 데 있어 핵심적인 역할을 수행한다. 철도신호시스템의 고장은 열차운행중지를 비롯하여 열차충돌이나 탈선등과 같은 치명적인 사고로 직결될 수 있기 때문에 시스템의 신뢰성과 안전성이 매우 중요하다. 현재까지 철도신 호시스템에서는 기존의 지상신호방식이 많이 사용되어 왔으나, 지상에 설치된 신호기 현시상태를 기관사가 육안으로 확인하여 열차속도를 제어함에 따른 기관사의 인적오류 등의 사고 위험이 있다. 아울러 시스템의 수명이 다 되어 시 스템절체의 필요성이 있다. 이에 따라 최근에는 컴퓨터 및 통신기술을 이용하여 열차속도제어 정보를 차량으로 송신 하여 차량에서 열차속도를 제어하는 차상신호방식이 도입 및 적용되어 효과를 나타내고 있다. 수명이 다 된 신호시스 템을 교체하기 위하여 승객을 위한 운행서비스를 하면서 새로운 방식으로 절체하는 것이 필요하다. 이에 본 논문에서 는 열차를 운영하면서 기존의 시스템과 새로운 시스템을 혼용하여 사용하면서 절체과정의 절차와 시스템 검증을 위 한 일련의 과정 중 간섭 문제에 대하여 특정한 기능을 부가하여 해결된 사례를 시험평가를 통해 검증하였다. The railway signalling system plays an essential role in the safe and efficient train operation as serving control functions of train operation intervals and train routes. The reliability and safety of the system are very important because the failure of the railway signalling system can lead to train collision or derailment as well as train operation stop. Until now, in railway signalling system the conventional wayside signal mode has been used generally. There are, however, the risk of accidents such as human mistakes caused by that the driver identifies the signal lamp status and controls train speed with the naked eye. It is also necessary to refurbish the obsolete system. Thereby, It is being effective that the onboard signal mode has been recently introduced and applied in order to transmit the speed control information to train by using the computer and communication equipment. It is necessary to switch over the system in a way while providing passengers with an operation service to replace the obsolete signal system. In this paper, we verify the cases through trial assessment which are solved by the way of adding specific functionalities in the problems of interference among the procedure of switch-over processes and a serial of processes for system verification while a train is operated in the new system in parallel to the existing system.

압축착화엔진에서 대두유 바이오디젤의 분무 및 배기 배출물 특성에 관한 연구

김도훈(Dohoon Kim),정의진(Euijin Jeong),허수성(Suseong Heo),최민기(Mingi Choi),박성욱(Sungwook Park) 한국자동차공학회 2012 한국자동차공학회 학술대회 및 전시회 Vol.2012 No.11

This paper presents that spray behavior, atomizing, combustion and emissions characteristics of soybeen oil biodiesel on the compression ignition engine. The fuel was selected diesel, biodiesel and 20% biodiesel blended diesel. And the injection quantity and injection rate of biodiesel was measured in the constant volume chanmber. As the injection pressure increased, the fuel automization quality was better. The engine experiment was conducted in the single cylinder engine, and soot, NOx emission was greatly decreased compare with diesel.

지방 출신 청년층의 이동·정주 양상과 수도권 지향 인식 논의 : 목포시, 춘천시 청년들을 사례로

김민주(Min-Joo Kim),정의진(Ui-Jin Jeong),오주원(Joo-Won Oh) 대한지리학회 2023 대한지리학회 학술대회논문집 Vol.2023 No.06

잔사회를 이용한 인공경량골재의 소성온도 및 시간별 발포특성

김용혁(Kim, Yong Hyok),정의진(Jeong, Eui Jin) 한국콘크리트학회 2014 한국콘크리트학회 학술대회 논문집 Vol.2014 No.10