ICT융복합 기술을 이용한 차세대 배전계통 운영 시스템 설계 및 검증

김동욱,박영배,추철민,조성호,서인용,Kim, Dongwook,Park, Youngbae,Chu, Cheolmin,Jo, Sungho,Seo, Inyong 디지털산업정보학회 2019 디지털산업정보학회논문지 Vol.15 No.4

Recently, with the rise of environmental issues and the change of government policy (Renewable Energy 3020 Implementation Plan), a large amount of renewable energy such as solar and wind power is connected to the power system, and most of the renewable energy is concentrated in the power distribution network. This causes many problems with the voltage management and the protection coordination of the grid due to the its intermittent power generation. In order to effectively operate the distribution network, it is necessary to deploy more intelligent terminal devices in the field to measure the status of the distribution network and develop various operation functions such as visualization and big data analysis to support the power distribution system operators. In addition, the failover technology must be supported for the non-stop operation of the power distribution system. This paper proposes the system architecture of new power distribution management system to cope with high penetration of renewable energy. To verify the proposed system architecture, the functional unit test and performance measurement were performed.

차세대 배전지능화시스템 개발을 위한 지리정보시스템 적용

김동욱,조성호,서호진,박영배,Kim, DongWook,Cho, SungHo,Seo, Hojin,Park, YoungBae 한국전력공사 2019 KEPCO Journal on electric power and energy Vol.5 No.2

최근 신재생 분산전원의 투입 확대로 배전계통 내 변동성이 커짐에 따라서 안정적인 배전계통 운영에 대한 우려가 커지고 있는 상황이다. 미래 배전계통의 효율적인 관리를 위해서 새로운 시각화 기술을 이용한 배전계통 운영시스템의 개선이 필요하다. 본 논문에서는 배전분야의 GIS 도입 현황과 관련 기술 동향을 기술하고, 배전계통 운영을 위해 GIS시스템의 필요성과 GIS기술 도입 시 해결해야할 문제점을 분석한다. Recently, as the renewable distributed energy resources has increased, the variability within the electrical power distribution system has increased, so that there is a growing concern about the stable electrical power distribution system. For efficient management of future electrical power distribution system, it is necessary to improve the electrical power distribution system operation using new visualization technology. In this paper, we describe the current status of GIS introduction and related technology trends in the field of electrical power distribution, and analyze the necessity of GIS system for electrical power distribution system operation and problems to be solved when introducing GIS technology.

레몬과 크랜베리즙이 닭 다리육의 저장품질에 미치는 영향

김동욱(Dongwook Kim),김희진(Hee-Jin Kim),김혜진(Hye-Jin Kim),김정수(Jung-Soo Kim),김한나(Hanna Kim),Joko Sujiwo,강석원(Seokwon Kang),곽현아(Hyeon-Ah Gwak),장애라(Aera Jang) 한국가금학회 2018 韓國家禽學會誌 Vol.45 No.1

본 연구는 레몬즙과 크랜베리즙에 닭 다리육을 침지하여 저장성 증진 및 품질에 미치는 영향을 규명하고자 실시하였다. 처리구는 닭 다리육을 멸균수에 침지한 대조구(CON), 1% 레몬즙에 침지한 처리구(LJ), 1% 크랜베리즙에 침지한 처리구(CJ), 0.5% 레몬즙과 0.5% 크랜베리즙을 혼합하여 침지한 처리구(LCJ)이었다. 닭 다리육을 레몬즙과 크랜베리즙에 20분간 침지시킨 후 4±1℃ 냉장실에서 0, 3, 6, 9일 동안 저장하면서 pH, 총균수, 육색, 관능적 특성, 지방산패도, 휘발성 염기태질소, 전자코를 이용하여 향기패턴의 변화를 분석하였다. 저장 3일차부터 모든 처리구는 대조구보다 유의적으로(P<0.05) 낮은 총균수를 나타내었으며, 또한 종합적 기호도는 저장 3일차부터 대조구보다 유의적으로(P<0.05) 높은 점수를 나타내었다. 또한 지방산패도와 휘발성 염기태질소 함량도 저장 3일차부터 처리구가 대조구보다 유의적으로 낮은 값을 나타내어 레몬즙과 크랜베리즙의 처리가 저장기간 동안 닭 다리육의 부패를 억제시킨 것으로 사료되며 이는 저장 3일차부터 처리구의 분포가 대조구와 구분되는 전자코 향기분석 결과와 유사하였다. 결과적으로 1% 천연 레몬즙과 크랜베리즙의 처리는 저장기간 동안 닭 다리육의 지방 산패와 단백질 부패를 억제하여 관능적인 특성의 감소를 지연시켜 저장 품질을 향상시키는 것으로 사료된다. This study was performed to evaluate the effect of lemon and cranberry juice on meat quality of chicken thighs during cold storage. Experimental groups were chicken thigh meat dipped into distilled water (CON), 1% lemon juice (LJ), 1% cranberry juice (CJ), and a mixture of 0.5% lemon juice and 0.5% cranberry juice (LCJ). The meat quality traits were determined at day 0, 3, 6, and 9 during cold storage at 4℃. The pH value of all treatments was lower than that of the control (P<0.05). Total microorganisms of CJ and LCJ at day 9 was 6.94 and 6.76 log CFU/g, respectively, whereas that of the control was 7.51 log CFU/g. The a* value of CJ and LCJ was higher than that of CON and LJ during storage (P<0.05), whereas the b* value of LJ, CL, and LCJ was lower than that of CON at day 6 and 9 (P<0.05). Overall acceptability of all treatments was significantly higher than that of CON after day 3. Thiobarbituric acid reactive substances and volatile basic nitrogen values were lower than those of the CON after day 3 (P<0.05). Principle component analysis (PCA) of the aroma pattern of all treatments was closer together, whereas PCA of the CON was scattered with the increase in storage days. This result suggests that dipping the chicken thigh meat into the lemon and cranberry juice could be beneficial to enhance chicken thigh meat quality by retardation of total microbes, lipid oxidation, and protein decomposition.

선박용 3 차원 서라운드뷰 학습모델을 위한 사용자평가 기반의 학습 데이터 합성

김동욱(Dongwook Kim),김종훈(Jonghun Kim),정태민(Taemin Jeong),김하늘(Haneul Kim),김동준(Dongjoon Kim) 한국HCI학회 2023 한국HCI학회 학술대회 Vol.2023 No.2

Surround View Monitor (SVM) 시스템은 차량에 장착된 카메라 영상으로 차량 주변 영상을 재구성하는 시스템이다. SVM 은 차량 주차 시 필요한 영상 정보를 하나의 뷰로 제공하며, 이는 선박의 정박에도 유용하게 사용된다. 그러나, 기존 SVM 시스템은 고정된 수평면을 가정한 호모그래피에 기반하므로 지형 정보가 왜곡된 주변영상을 제공하는 한계가 있다. 본 연구는 선박의 정박상황에 특화된 SVM 을 목표로 하며, 기존 SVM 시스템의 한계를 극복하기 위해 장면재구성 (scene reconstruction) 및 영상완성 (image completion) 학습모델을 블록빌딩으로 하는 프레임워크를 제안한다. 제안 프레임워크를 구성하는 학습모델을 위한 효과적인 학습데이터 획득 및 학습모델 설계를 위해 정박 상황의 시뮬레이션 영상을 활용한다. 또한, 선박 정박 상황을 몰입형 가상현실로 구현하여 선박운항 전문가가 고난도 정박 상황을 경험하게 하고 제안한 시스템에서 생성한 SVM 을 경험하게 한다. 최종적으로 이를 통해 획득한 사용자 평가데이터를 제안한 SVM 시스템의 학습데이터 생성 및 학습모델 설계에 활용한다.

지역화로 재생산된 셰익스피어

김동욱(Dongwook Kim) 한국셰익스피어학회 2012 셰익스피어 비평 Vol.48 No.2

The world-wide significance of Hamlet is evident that Shakespeare is regarded as a classic indispensable to the repertoire in the theatre of Korea. In fact, Hamlet is the most frequently produced play in Korea during the last two decades. Some productions recorded great box-office success localizing the play with ‘tradapted’ versions in various ways. Among them, four most controversial productions during 1990’s are selected to be analyzed in which Lee Yun-taek’s Hamlet (1996) and The Trouble-maker, Yonsan (1995), Lim Jae-chan’s Invitation. 1997 Spring, and Kim Ah-rah’s Hamlet 1999 were included. Lee’s The Trouble-maker, Yonsan is a certain kind of ‘tradapted’ production in which the Brechtian and the Artaudian theories as well as the ritual and the expressionism fused with Korean traditional elements were found during the play. Lee put a tyrant, Yonsan from Chosun dynasty into the position paralleled with Hamlet in terms of the theme of revenge. As in Hamlet, a ghost enters in the opening scene dancing a slow movement, a shamanic rite, Gut is performed under the direction of Yonsan as the play-within-the-play in Hamlet, and at the end, Yonsan kills all major characters who are connected with the death of his mother. Compare this to Kurosawa Akira’s Ran, it would be considered as one of the qualified tradaptation of the localized Hamlet. Lee’s Halmet is an another example of the tradaption, which make a great box-office success in front of the local audience as well as of the global audience in Russia. In this production, Lee keeping the authenticity of the source text tried to create an intercultural performance mixing some Western elements with their Korean counterparts: rearranged the sequence of scenes and non-verbal elements; used Korean mask dance, percussion quartet, Young-nam Deotboigy dance, the local mise-en-scene composed of the inside of Cheon-ma-chong, Budhist monk garment, and mixed the sound and music of the Korean instruments with piano and violin. This production would be a good attempt to expand our contemporaries through deconstructing Christian tradition with Korean shamanism. Lee’s intercultural production would begin to interchange between the East and the West expanding Shakespeare’s authenticity for all global/local audience. Lim Jae-chan’s Invitation. 1997, Spring transformed the blood-shedding revenge tragedy into a trial play. It is Fortinbras who is a judge in this trial. The scenes of the source text were rearranged according to the process of the trial, and just sitting their seats in the auditorium, the audience spontaneously took a part in that trial as the jury. This trial format, of course, reflects the contemporary socio-political milieu of the Korea. Kim Ah-rah’s Hamlet, 1999, on the other hand, shows another way of tradaptation. Using the confucian ideology of ‘hyo’(filial duty) and ‘choong’(loyalty) instead of Christian counter part, Kim transformed melancholy Hamlet in meditation to unrestrained popular one of an elaborate action. Shakespeare often serves as a touchstone to test not only the potentiality of local culture in their integration with the global, but also the localizability of the global. The outstanding and somewhat puzzling innovations of the selected productions in this essay would be awkward to the Western audience because of their local settings or names, metatheatrical frames and tradaptation. However, as Bharucha argues, “It is only by accepting that the translation process is constantly being interrupted, reversed, and questioned from multiple angles, not just between theatre cultures but within the intercultural differences of these cultures, that we can begin to embrace the joyous difficulties of working on Shakespeare in ‘foreign’ contexts” (278).

단순전단 시험법 구축 및 바우싱거효과를 고려한 경화거동 예측

김동욱(Dongwook Kim),방성식(Sungsik Bang),김민수(Minsoo Kim),이형일(Hyungyil Lee),김낙수(Naksoo Kim) 대한기계학회 2013 大韓機械學會論文集A Vol.37 No.10

본 연구에서는 zircaloy-4 판재에 대해 바우싱거 효과를 고려한 경화거동 예측모델을 구축했다. 금속소재 가공에서 인장 후 압축 시 항복응력이 감소한다. 이에 스프링백 해석 시 바우싱거 효과를 반드시 고려해야 한다. Simple shear 시험에서 적정 시편크기 및 적정 조임토크에 대한 결정법을 제시했다. 5 가지 재료에 대한 simple shear 시험을 통해 응력-변형률 곡선을 구했다. 또한 유한요소해석을 활용해 simple shear 하중-변위 곡선으로부터 유효응력-변형률 곡선으로 변환과정을 소개했다. 등방/운동성 경화 조합모델을 활용해 simple shear 순/역방향 시험을 모사했다. 이때 각 경화계수에 따른 하중-변위 곡선 변화를 관찰하고, zircaloy-4에 대한 경화계수를 결정했다. In this study we establish a process to predict hardening behavior considering the Bauschinger effect for zircaloy-4 sheets. When a metal is compressed after tension in forming, the yield strength decreases. For this reason, the Bauschinger effect should be considered in FE simulations of spring-back. We suggested a suitable specimen size and a method for determining the optimum tightening torque for simple shear tests. Shear stress-strain curves are obtained for five materials. We developed a method to convert the shear load-displacement curve to the effective stress-strain curve with FEA. We simulated the simple shear forward/reverse test using the combined isotropic/kinematic hardening model. We also investigated the change of the load-displacement curve by varying the hardening coefficients. We determined the hardening coefficients so that they follow the hardening behavior of zircaloy-4 in experiments.

주성분 회귀분석을 활용한 유량 자료에 대한 기후변화 및 인위적 인자의 영향 평가

김동욱(Dongwook, Kim),고민수(Min Soo, Ko),무하마드 제한제이브(Muhammad Jehanzaib),김태웅(Tae-Woong, Kim) 대한토목학회 2020 대한토목학회 학술대회 Vol.2020 No.10

셰익스피어 강의를 위한 멀티미디어 활용방안 연구

김동욱(Kim Dongwook) 한국셰익스피어학회 1999 셰익스피어 비평 Vol.35 No.2

공공부문 정보보호전문인력의 직군이탈의도에 관한 연구

김동욱(Kim, Dongwook),성욱준(Sung, Wookjoon) 경성대학교 사회과학연구소 2012 社會科學硏究 Vol.28 No.2

본 연구는 공공부문 정보보호전문인력의 직군이탈의도를 분석하는 것을 목적으로 한다. 자료수집을 위해 중앙 및 지자체 정보보호업무 공무원을 대상으로 설문조사를 실시하였으며, 이 결과를 SPSS17.0을 이용해 요인분석 및 다중회귀분석을 실시하였다. 종속변수는 직군이탈의도이며, 독립변수로 조직행태요인들(조직만족, 직무만족, 직무스트레스), 인력의 전문성 요인들(자격증, 학력, 전공), 조직구조요인(정보보호 전담부서)이다. 분석결과, 정보보호전문인력의 직군이탈의도에 영향을 미치는 요인으로 직무스트레스(+)와 정보보호 전담부서(-)가 유의미한 변수로 분석되었다. 정보보호 분야 전문인력의 효과적 관리를 위해 정보보호전문인력의 충원 및 팀 또는 계 단위의 전담부서의 설치가 필요할 것으로 보인다. This study analyzes the separation-intention from an occupational group of information security professionals in the public sector. We conducted a survey of 316 officials, and used factor analysis and multi-regression analysis. A dependent variable is the separation-intention from an occupational group. Independent variables are organizational behavior factors(organizational satisfaction, job satisfaction, job stress), professionalism factors (certification, education, major) and organizational factor(organizational department). According to the result of the analysis, factors of job stress and organizational department had an effect on the the separation-intention. We propose that the government should increase the number of information security professionals and set up a task force.

DCT 습식 클러치팩 내부 공간에서의 변속기유 유동 해석

김동욱(Dongwook Kim),박종술(Jongsool Park),장시열(Siyoul Jang) 한국자동차공학회 2018 한국자동차공학회 부문종합 학술대회 Vol.2018 No.6