북태평양 스톰트랙 활동과 동아시아 겨울 몬순의 상관성에 관한 CMIP5 모델의 모의 성능

윤재승(Jae-Seung Yoon),정일웅(Il-Ung Chung),신상희(Sang-Hye Shin) 한국기상학회 2015 대기 Vol.25 No.2

Based on the CMIP5 historical simulation datasets, we assessed the performance of state-of-the-art climate models in respect to the relationship between interannual variabilities of the North Pacific synoptic eddy (NPSE) and East Asian winter monsoon (EAWM). Observation (ERAInterim) shows a high negative correlation (?0.73) between the interannual variabilities of East Asian winter monsoon (EAWM) intensity and North Pacific synoptic eddy (NPSE) activity during the period of 1979~2005. Namely, a stronger (weaker) EAWM is related to a weaker (stronger) synoptic eddy activities over the North Pacific. This strong reverse relationship can be well explained by latitudinal distributions of the surface temperature anomalies over East Asian continent, which leads the variation of local baroclinicity and significantly weakens the baroclinic wave activities over the northern latitudes of 40°N. This feature is supported by the distribution of the meridional heat flux (v`θ`) anomalies, which have negative (positive) values along the latitudes 40~50°N for strong(weak) EAWM years. In this study, the historical simulations by 11 CMIP5 climate models (BCC-CSM1.1, CanESM2, GFDL-ESM2G, GFDL-ESM2M, HadGEM2-AO, HadGEM2-CC, IPSL-CM5A-LR, MPI-ESM-LR, MPI-ESM-MR, MRI-CGCM3, and NorESM1-M) are analyzed for DJF of 1979~ 2005. Correlation coefficient between the two phenomena is ?0.59, which is comparable to that of observation. Model-to-model variation in this relationship is relatively large as the range of correlation coefficient is between ?0.76 (HadGEM2-CC and HadGEM2-AO) and ?0.33 (MRI-CGCM3). But, these reverse relationships are shown in all models without any exception. We found that the multi-model ensemble is qualitatively similar to the observation in reasoning (that is, latitudinal distribution of surface temperature anomalies, variation of local baroclinicity and meridional heat flux by synoptic eddies) of the reverse relationship. However, the uncertainty for weak EAWM is much larger than strong EAWM. In conclusion, we suggest that CMIP5 models as an ensemble have a good performance in the simulation of EAWM, NPSE, and their relationship.

퍼지 이론과 슬라이딩모드 제어를 이용한 스위치드 릴럭턴스 전동기의 토크리플 저감

윤재승(Jae-Seung Yoon),김동희(Dong-Hee Kim),신혜웅(Hye-Ung Shin),이교범(Kyo-Beum Lee) 대한전기학회 2014 전기학회논문지 Vol.63 No.10

This paper presents a torque ripple reduction algorithm for the switched reluctance motor drives using the fuzzy logic and the sliding mode control. A turn-on angle controller based on the fuzzy logic determines the optimal turn-on angle. In addition, a sliding mode torque control (SMTC) methods reduces torque ripples instantaneously in the commutation region. The proposed algorithm does not require complex system models considering nonlinear magnetizing or demagnetizing periods of the phase current. According to the rotor speed and torque, the proposed controller changes the turn-on angle and reference torque instantaneously until the torque ripples are minimized. The simulation and experimental results verify the validity of minimizing the torque ripple performance.

향상된 전차원 자속 관측기를 이용한 매입형 영구자석 동기 전동기의 넓은 영역 센서리스 속도제어 알고리즘 기법

강성윤(Seong Yun Kang),윤재승(Jae Seung Yoon),신혜웅(Hye Ung Shin),이교범(Kyo-Beum Lee) 대한전기학회 2017 전기학회논문지 Vol.66 No.2

This paper proposes a sensorless control method to improve the performance of an internal permanent magnet synchronous motor (IPMSM) control by using a full-order flux observer in a wide speed range. The conventional sensorless control method uses a constant gain for high performance at low-speed region. However, this method has drawbacks such as an increased angle error and current ripple in the high-speed region due to the fixed gain value. In order to overcome this problem, the gain of the full-order flux observer is changed by considering the angle error in the whole speed range. The proposed method minimizes the angle error for each region of the speed range by applying a relevant gain value, which improves the current ripple reduction and motor noise cancellation. The validity of proposed sensorless control method is verified by a simulation and an experiment.

매입형 영구자석 동기기 센서리스 구동부의 개선된 절환 기법

한동엽(Dong Yeob Han),윤재승(Jae Seung Yoon),조용수(Yongsoo Cho),이교범(Kyo-Beum Lee) 대한전기학회 2016 전기학회논문지 Vol.65 No.8

This paper proposes the improved transition scheme for a sensorless drive of an interior permanent magnet synchronous motor (IPMSM). In order to operate the IPMSM, the current controller can be used until 300 rpm for the initial operation. After that, the control method of IPMSM is changed to the speed controller for the sensorless control method. At that point, the rotor speed overshoot is generated due to the rapid change of the current reference for the speed controller. The proposed algorithm is able to reduce the overshoot of a rotor speed by compensating the estimated feedforward value to the speed controller. The feedforward value of the current reference is estimated by using a coordinate transformation and is approximated to the current reference after the transition of the control mode. The effectiveness of the proposed scheme is verified by experiments using an IPMSM drive system.

정전구역 해소를 위한 전문가 시스템 연구

박영문(Young-Moon Park),윤재승(Jae-Seung Yoon),이광호(Kwang-Ho Lee) 대한전기학회 1992 대한전기학회 학술대회 논문집 Vol.1992 No.7

새로운 PCR 클로닝 벡터의 개발

김윤일,백광희,윤재승 경희대학교 산학협력기술연구원 1996 산학협력기술연구논문집 Vol.2 No.-

PCR (Polymerase Chain Reaction) is a powerful technique for amplifying specific DNA region of interest. The PCR was used first only in the field of molecular biology, but nowadays it is widely used in the various fields such as diagnosis of genetic disorders, identification of forensic samples, and classification of organisms. However, Taq(Thermus aquaticus)DNA polymerase used in PCR has been reported to add a single nontemplate-directed A residue to the 3' ends of amplified KNA, giving rise to the difficulties in the cloning of amplified DNA. Considering the wide applications of the PCR, the development of the efficient cloning vector for PCR-amplified DNA would be very helpful for various purposes, we have designed the PCR cloning vector using the nucleotide sequence recognized by restriction endonuclease Xcm I. The double incorporation of Xcm I recognition sites in the pUC 19 and m13 DNA can make compatible ends carrying T residue and be easily ligated to PCR products.

마취가 신혈류 및 위기능에 미치는 영향

윤재승 대한마취과학회 1987 Korean Journal of Anesthesiology Vol.20 No.5

Mepirizole 유도 십이지장 궤양에 관한 실험적 연구

윤재승 圓光大學校 醫科學硏究所 1987 圓光醫科學 Vol.3 No.2

To make an experimental model of the duodenal ulcer is necessary to investigate the mechanism of the duodenal ulcer and the efficacy of the drugs for the duodenal ulcer. The author tried an experimental study of mepirizole - induced duodenal ulcer. Mepirizole ( [1-(4-methoxy-6-methyl-2-pyrimidinyl)-3-mehyyl-5-methoxy pyrazole] ) is a sort of an antiinflammatory drugs. Various doses of mepirizole (50, 100, 200, and 300㎎/㎏) were administered orally as a single dose to rats, and then changes of the morphology of the stomach and duodenum and the gastric acidity were observed. 1. Morphologic changes On gross examination of the stomach and duodenum of the rats that were fasted for 24 hours after various amount of mepirizole administration, mepirizole-induced ulcer was confined to the duodenum, and the gastric mucosa was only erosive but not ulcerative. The size of duodenal ulcer was proportional to the administered dose of mepirizole. In 200 and 300 ㎎/㎏ of mepirizole administered groups, all animals showed duodenal ulcer, and perforation rate of duodenal ulcer were 25% and 75%, respectively. But the mortality rate was relatively low (5% in 200 ㎎/㎏ - groups, and 10% in 300 ㎎/㎏-group). Histologically, necrotic lesions were confined to the duodenal mucosa in 50 and 100㎎/㎏- groups, but in 200 and 300 ㎎/㎏- groups, most of experimental animals showed duodenal ulcer which penetrated musculoserosal layer. Desquamation and necrosis of the gastric mucosal cells were noted in groups of large doses of mepirizole (more than 100㎎/㎏). 2. Gastric acidity An increase of gastric acidity was dependent to the dosage and the time interval of mepirizole treatment. According to these results, mepirizole is an excellent agent for an experimental duodenal ulcer and the effective dose is about 200㎎/㎏. Nothing per oral for 24 hours after mepirizole administration is mandatory. Increased gastric acidity might be a major role in the mechanisms of mepirizole- induced duodenal ulcer.

Mepirizole 誘導 十二指腸潰瘍에 關한 實驗的 硏究

尹在勝,沈載桓,朴庠洙,李惠洙,崔湖烈 의과학연구소 1988 全北醫大論文集 Vol.12 No.2

An experimental model of the duoednal ulcer is necessary to investigate the mechanism of the duodenal ulcer and the efficacy of the drugs for the duodenal ulcer. The author tried an experimental study of mepirizole-induced duodenal ulcer. Mepirizole([1-(4-methoxy-6-methyl-2-pyrimidinyl)-3-methyl-5-methoxy pyrazole]) is a sort of antiinflammatory drugs. Various doses of mepirizole(50,100,200, and 300mg/kg) were administered orally as a single dose to rats, and then changes of the morphology of the stomach and duodenum and the gastric acidity were observed. 1. Morphologic changes On gross examination of the stomach and duodenum of the rats that were fasted for 24ours after various amount of mepirizoed administration, mepirizole-induced ulcer was confined to the duodenum, and the gastric mucosa was only erosive but not ulcerative. The size of duodenal ulcer was proportional to the administered dose of mepirizole. In 200 and 300mg/kg of mepirizol-administered groups, all animals showed duodenal ulcer, and perforation rate of duodenum ulcer were 25% and 75%, respectively. But the mortality rate was relatively low(5%, in 200mg/kg-groups, and 10% in 300mg/kg-group). Histologically, necrotic lesions were confined to the duodenal mucosa in 50 and 100mg/kg-groups, but in 200 and 300mg/kg-groups, most of experimental animals showed duodenal ulcer which penetrated musculoserosal layer. Desquamation and necrosis of the gastric mucosal cells were noted in groups of large doses of mepirizole(more than 100mg/kg). 2. Gastric acidity An increase of gastric acidity was dependent to the dosage and the time interval of mepirizole treatment. According to these results, mepirizole is an excellent agent for an experimental ulcer and the effective dose is about 200mg/kg. Nothing per oral for 24 hours after mepirizole administration is mandatory. Increased gastric acidity might be a major role in the mechanisms of meporizled- induced duolenal ulcer.

Epinephrine 첨가 Lidocaine 에 의한 액와신경차단시 발생한 Potassium 감소에 대한 Propranolol 의 영향

윤재승,이강창,김태요,임홍섭 대한마취과학회 1989 Korean Journal of Anesthesiology Vol.22 No.3

Recently, interest has been increased on the role of catecholamines in extrarenal potassium homeostasis. This study has undertaken to investigate the effects of epinephrine added to lidocaine for axillary block in HR, MAP, ABG, blood sugar and electrolytes (Na+, K+), and the effects of propranolol, β-adrenergic blocker, on the data. The patients admitted to our hospital for operation of upper extremities were divided into three groups. Group I was 10 patients blocked with lidocaine 30 ml. Group II was 14 patients blocked with lidocaine 30 ml with epinephrine 0.3 mg(1:100,000). Group III was 10 patients pretreated with propranolol (10μ/kg) and blocked with lidocaine 30 ml with epinephrine. After block, the results were as follows. 1) MAP decreased in all group and group III decreased more than group I. 2) HR increased all group and group III decreased more than group I. 3) ABG showed hypoventilatory pattern due to sedative effect by diazepam (0.15mg/kg). 4) Blood sugar value was increased in group I and IIshowed increasing tendency in group III, but this tendency was not significant. 5) Blood K+ concentration decreased significantly and the maximal decrease was 0.5 mEq/L in 30 min after block, but there was not significant decrease in group III. This results indicate that clinical dose of epinephrine(1;100,000) decrease blood K+ concentration significantly and propranolol (10μ/kg) pretreatment prevent K+ decreasing effect of epinephrine. In clinical practice, it is suggested that much care must be paid to use of local anesthetics with epinephrine to hypokalemic patients.