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강화학습을 활용한 PV 인버터의 volt/var 제어 기반의 PCC단 전압 불평형 보상 전략
정윤건(Yoongun Jung),한창희(Changhee Han),이동원(Dongwon Lee),송성윤(Sungyoon Song),장길수(Gilsoo Jang) 대한전기학회 2021 대한전기학회 학술대회 논문집 Vol.2021 No.10
This paper developed a strategy using smart inverters to mitigate voltage unbalances at the PCC through volt/var control by multi-agent deep reinforcement learning. Deep reinforcement learning has the great advantage of little computational time to derive the optimal action with by using Deep Neural Network. In the proposed framework, a multiple inverters needs information on each phase voltage at the connected bus and the active power output of each PV by determining appropriate volt/var curve. The proposed strategy has been demonstrated in IEEE 13 nodes modified using over been demonstrated in IEEE 13 nodes modified using over time loads and PV profiles. A comparison is performed between the fixed droop inverter and the proposed inverter. The proposed method achieves a reduction in voltage unbalance over fixed droop inverters.
픽셀 파티클 시뮬레이션 기반의 영상 스케치 드로잉 기법
정윤건(Yoon-Gun Jung),윤종철(Jong-Chul Yoon) 한국정보과학회 2012 정보과학회논문지 : 시스템 및 이론 Vol.39 No.1
영상의 비사실적 렌더링 기법(Non-photorealistic Rendering)이란 입력 영상을 추상화 또는 스타일화 하여 표현하는 방식으로, 정보전달에 용이하다는 점과 보는 이에게 보다 친밀하게 다가갈 수 있다는 장점을 가진다. 본 논문에서는 이러한 영상의 비사실적 렌더링 기법의 하나의 방식으로 실사 영상을 스케치 형태로 변형하는 새로운 방법을 제안한다. 기존의 필터링 기법 방식의 외곽선 추출 방식을 벗어나 실제 사람이 그린듯한 형태의 메커니즘을 따라가는 픽셀 파티클 기반의 접근을 사용하여 보다 미적이며 다양한 효과의 적용이 가능한 스케치 드로잉 기법을 소개한다. 본 논문의 기법을 사용하여 적은 표현으로 영상의 대한 많은 정보를 전달 할 수 있는 새로운 방식의 영상 스타일화가 가능하다. Non-photorealistic rendering (NPR) generally involves abstraction and stylization of a scene: NPR could extract important visual cues that convey the essence of the scene more effectively. We present a method for converting the photorealistic image to a sketch-drawing form using a flow vector field which preserves spatial coherence of image. Using flow vector field, we present a pixel particle-based sketch-drawing method which mimics a mechanism of manmade picture and provide by feature preserve line-drawing result. Using our method user can convert image as a line-drawing form easily without any user intervention.
장귀영, 윤건묵, 정헌상 忠北大學校 農業科學硏究所 2016 農業科學硏究 Vol.32 No.1
This study was performed to investigate the physicochemical characteristics of different parts�ᅠ�ᅠ of Rhus verniciflua extracts with extraction temperatures. As increasing temperatures, total solid contents of bark and xylem were increased from 3.29% and 1.69% to 14.66% and 17.87%, respectively. Glucose and fructose of free sugars were detected in bark and xylem extracts, and free sugar are almost exist in the glucose. In xylem extract, glucose was significantly increased with increasing temperature, and those contents of bark and xylem extracts at 160oC were 0.26 and 0.36%, respectively. As increasing temperatures, pH was decreased, and total acidity was increased in all samples. Browning index and 5-HMF content were significantly increased with an increasing temperature, and 5-HMF was detected only at above 100oC. Significant correlation were observed among extraction temperature, total solid content, glucose content, pH, total acidity, browning index, and 5-HMF content.
폐쇄성 타액선염을 일으키는 드문 타액선관 질환들에서 타액선 내시경술의 유용성
김재원,정윤건,김창효,김보묵,이동율,오윤석,김영모 대한이비인후과학회 2008 대한이비인후과학회지 두경부외과학 Vol.51 No.10
Ductal calculi and stenosis are well known causes of salivary ductal obstructive lesions. As a direct view of the ductal systems was not possible for the surgeons, sialendoscopy has been a convenient tool for finding out these obstructive lesions. This study contains some unusual endoscopic findings that we have found during diagnostic and interventional sialendoscopy. Subjects and Method:Retrospective chart reviews were done, and endoscopic findings were reviewed for patients who received sialendoscopy from September 2003 to January 2007. Sixtyfour patients received sialendoscopy for either diagnostic or interventional method. Results:We found unusual findings in 7 cases (10.9%). Three cases of basin malformation were observed. Two cases had spontaneous ductal perforation, and we also observed 2 cases of occult stone. Conclusion:The sialendoscopy is an excellent method in evaluating and treating salivary ductal diseases. We found out that the sialendoscopy made it possible to explore ductal systems completely, as well as to detect unusual findings, and to help in the management of some salivary ductal diseases. (Korean J Otorhinolaryngol-Head Neck Surg 2008;51:903-7)