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오태석,김민석,문영일,안재현,Oh. Tae-Suk,Kim. Min-Seok,Moon. Young-Il,Ahn. Jae-Hyun 한국방재학회 2009 한국방재학회논문집 Vol.9 No.4
최근 한반도에서는 이상기후 및 기후변화의 영향으로 인한 피해가 증가하고 있는 추세이다. 따라서 본 연구에서는 자료기간에 따른 확률강우량의 변화 특성에 대하여 분석하였다. 분석 대상 자료는 기상청에서 관할하고 있는 관측소 중에서 비교적 장기간의 자료를 보유하고 있는 14개 지점을 선정하였다. 선정된 지점에서 강우자료의 관측년수를 기준으로 5가지 경우로 구분하여 빈도해석을 실시하였다. 빈도해석 결과, 우리나라 대부분 지역에서 확률강우량이 뚜렷하게 증가하는 것을 확인할 수 있었다. 또한 관측된 강우량 자료와 확률강우량 자료를 이용한 변동성과 경향성 분석을 실시하였다. 통계적 분석 결과에서 강우자료는 변동성과 경향성이 거의 나타나지 않았으나, 확률강우량 자료에서는 변동성과 경향성이 다수 나타나는 것으로 분석되었다. 또한 대부분의 지점에서 변동성 및 경향성에 의해 확률강우량이 증가하는 것으로 나타났다. 이는 확률강우량의 변화에 대한 수공구조물 등의 설계 및 기존의 홍수 방어능력에 대한 검토 필요성을 의미한다. Recently, Natural disasters are increasing the damage according to the influence of the abnormal climate and climate change. This study analyzed change characteristic of Design Rainfall according to the different data periods. First, 14 observatories were selected at Meteorological Administration. Second, frequency analysis carried out 5 cases by different data periods. At the results of the frequency analysis, the design rainfall could confirm the increase in most areas of Korea. Also, the change and trend analysis carried out for characteristic analysis by design rainfall and observed rainfall. The change and trend analysis of observed annual maximum rainfall did not appeared, but the change and trend analysis of design rainfall significantly appeared using statistic methods. The result of the change and trend analysis, design rainfall increased in most areas of Korea. Although, it could be the necessity for reestimating defense ability of flood, existing river systems, and new establishment of structure about the change characteristic.
브러시리스 직류전동기의 토크맥동 저감을 위한 전환시간 제어
吳台錫(Tae-Seok Oh),許南憶(Nam-Euk Her),金一煥(Il-Hwan Kim) 대한전기학회 2006 전기학회논문지 D Vol.55 No.8
This paper presents a new method on reducing commutation torque ripples generated in brushless dc motor drives. In such drives the current ripples are generated by motor inductance in stator windings and the back EMF. The ripples suppression techniques that are practically effective in high speed as well as in low speed regions are rarely found. The proposed method here is based on a strategy that the commutation intervals of the incoming ang the outgoing phases can be equalized by a proper PWM control. The controller is implemented by a 16-bit microprocessor and effectiveness of the proposed control method is verified through experiments.
오태석 ( Tae Seok Oh ),백유상 ( Yoo Sang Baek ),신원웅 ( Won Ung Shin ),허영수 ( Young Soo Heo ),손수빈 ( Soo Bin Son ),김용주 ( Yong Ju Kim ),송해준 ( Hae Jun Song ),오칠환 ( Chil Hwan Oh ) 대한피부과학회 2010 대한피부과학회지 Vol.48 No.12
Poststeroid panniculitis is a very rare complication of corticosteroid therapy, and this is characterized by firm subcutaneous nodules on the cheek, neck or upper trunk within days or weeks following rapid systemic steroid tapering or cessation in childhood. It can be identified by the clinical features and a history of using steroid, and if necessary, with a biopsy. There have been just 2 reported cases in adulthood, one was an autopsy case of a 28-year woman and another was a 60-year-old man after massive administration of corticosteroids for congestive heart failure. Herein, we report a case of panniculitis accompanied by Cushing`s syndrome in an adult after long-term misuse of systemic steroid for rosacea. (Korean J Dermatol 2010;48(12):1100∼1103)
유도전동기 속도제어를 위한 비선형 비례적분 제어기 설계
오태석(Oh Tae Seok),김일환(Kim Il Hwan),박찬원(Park Chan Won) 강원대학교 산업기술연구소 2006 産業技術硏究 Vol.26 No.1
This paper presents a robust speed control method of induction motors(IM) using a Non-linear PI controller(NPI). NPI is high gain controller in region of small error, and low gain controller in region of large error. So in steady state, system will be robust against variation of load torque. The simulation and experiment results confirm the validity of proposed control scheme.
吳台錫(Tae-Seok Oh),尹成容(Sung-Yong Yun),金一煥(Il-Hwan Kim) 대한전기학회 2007 전기학회논문지 Vol.56 No.1
In this paper we propose an efficient offset curve generation algorithm for open and closed 2D point sequence curve(PS curve) with line segments in the plane. One of the most difficult problems of offset generation is the loop intersection problem caused by the interference of offset curve segments. We propose an algorithm which removes global as well as local intersection loop without making an intermediate offset curve by forward tracing of tangential circle. Experiment in computer sewing machine shows that proposed method is very useful and simple.
표고버섯 균사체 배양기간에 따른 PDB 배지 내 유리 아미노산 변화
오태석 ( Tae-seok Oh ),박윤진 ( Youn-jin Park ),김태권 ( Tae-kwon Kim ),안승원 ( Seoung-won Ann ),김창호 ( Chang-ho Kim ),조용구 ( Yong-koo Cho ),장명준 ( Myoung-jun Jang ) 한국환경과학회 2019 한국환경과학회지 Vol.28 No.4
This study was carried out to investigate the changes in the amount of 20 free amino acids in PDB (Potato Dextrose Broth) medium during the incubation period while cultivating Lentinula edodes. The total incubation period was 90 days, and the total amount of free amino acids was confirmed every 45 days. Among the 18 kinds of amino acids whose increase and decrease patterns were confirmed, 10 amino acids were increased compared to that in the control, among which cysteine increased from its initial value of 9,889 ± 3 μg/L to 12,909 ± 2 μg/L at 45 days and 29,256 ± 4 μg/L at 90 days. Six amino acids with decreased expression patterns were identified. Arginine decreased to 83,751 ± 2 μg/L after 45 days from its initial value of 161,787 ± 1 μg/L and to 79,055 ± 7 μg/L at 90 days.