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배병열(Byung-Yeol Bae),전영수(Young-Soo Jon),한병문(Byung-Moon Han),소용철(Yong-Choel Soh) 전력전자학회 2004 전력전자학술대회 논문집 Vol.- No.-
The performance of an active power filter(APF) depends on the inverter characteristic, the control method, and the accuracy of reference signal generator. The accuracy of reference generator is the most critical item to determine the performance of active power filter. This paper introduces a novel reference signal generator composed of improved adaptive predictive filter. The performance of proposed reference signal generator was first verified through a simulation with MATLAB. Furthermore, the application of feasibility was evaluated through experimenting with a single-phase APF prototype based on the proposed reference generator, which was implemented using the TMS320C31 floating-point signal processor. Both simulations and experimental results confirm that our reference signal generator can be used successfully in practical active power filters.
裵炳烈(Byung-Yeol Bae),李斗榮(Doo-Young Lee),韓炳文(Byung-Moon Han),高宗宣(Jong-Sun Ko),崔南燮(Nam-Sub Choi) 대한전기학회 2008 전기학회논문지 Vol.57 No.1
This paper describes the development of a novel islanding detection method, which uses the signal cross-corelation scheme between the injected reactive current and the power frequency deviation. The existing method, which injects the reactive current of 2.5-5% to the rated current and detects the frequency deviation directly, brings about lowing the power quality due to the harmonic pollution. The proposed method eliminates the weak point of the existing method, because it injects the reactive current less than 1% to the rated current. The operational feasibility was verified through computer simulations with PSCAD/EMTDC software, and experimental works with a 10㎸A hardware prototype. The proposed method can detect the islanding status effectively without lowing the power quality of interconnected distributed generation system.
배병술,최우정,한광현,한경화,류순호,노희명,Bae, Byung-Sul,Choi, Woo-Jung,Han, Gwang-Hyun,Han, Kyung-Hwa,Yoo, Sun-Ho,Ro, Hee-Myong Korean Society of Soil Science and Fertilizer 2003 한국토양비료학회지 Vol.36 No.1
Time domain reflectometry (TDR) is a newly developed method for measuring simultaneously solute concentrations and volumetric water content of soil. Bulk electrical conductivity ($EC_a$) of soil is obtained from TDR signal using several equations proposed, and electrical conductivity of soil solution ($EC_w$) can be calculated using the linear relationship $EC_a=EC_w\theta(a\theta+b)+EC_s$ between $EC_a$ and $EC_w$ at constant soil water content. The objectives of this study were to evaluate $EC_a$ proposed by several workers and to obtain the empirical constants (a, b, and $EC_s$) for $EC_w$ of the soils from A, Bl, and B2 horizon of an agricultural field (Coarse loamy, Fluvaquentic Eutrudepts). The $EC_a$ proposed by Yanuka et al. responded most sensitively to the KCl solute concentrations. The empirical constants of a, b, and $EC_s$ for $EC_w$ were -0.249, 1.358, and 0.054 for A horizon, -2.518, 2.708, and 0.097 for Bl horizon, and 2.490, -0.250, and 0.103 for B2 horizon, respectively. Therefore, the results of this study showed that Yanuka et al. equation was most useful one in determining $EC_a$, from TDR signal for agricultural soil with low salinity and that the empirical constants for the calculation of $EC_w$, from $EC_a$ can be obtained through a simple calibration experiment. Time Domain Reflectometry(TDR)은 토양의 순분함량과 전기전도도를 측정할 수 있는 비파괴적인 방법이다. 초기 전자파에 대한 TDR 반향파의 감쇄정도를 이용하여 토양의 총전기전도도($EC_a$)를 직접 계산할 수 있는 다양한 식들이 제안된 바 있다. 또한, $EC_a$로부터 보다 실질적인 의미가 있는 토양 용액의 전기전도도($EC_w$)를 계산하기 위해서는 일정 토양 수분 함량에서 $EC_a$와 $EC_w$가 갖는 직선관계식[$EC_a=EC_w{\theta}(a{\theta}+b)+EC_s$]이 이용된다. 따라서 본 연구에서는 TDR 신호를 이용하여 $EC_a$를 계산할 수 있는 다양한 식을 비교하여 가장 적합한 식을 제안하고, 농경지 토양(강서통, A, B1, B2 층위)을 대상으로 $EC_a$로부터 $EC_w를 계산할 때 필요한 실험상수(a, b, $EC_s$)를 구하고자 하였다. $EC_a$는 KCl 농도가 증가함에 따라 직선적으로 증가하였고, 특히 Yanuka 등이 제안한 식으로 계산한 $EC_a$가 용질 농도에 가장 민감하게 반응하였다. 직선회귀식을 이용하여 $EC_a$와 $EC_w$의 상관관계식의 실험 상수 (a, b, $EC_s$)를 구한 결과, 각각 -0.249, 1.358, 0.054(A층), -2.518, 2.708, 0.097(B1층), 2.490, -0.250, 0.103 (B2층)으로 조사되었다. 따라서 이상의 연구 결과는 TDR 신호를 이용해서 염농도가 낮은 일반 농경지 토양의 $EC_a$를 계산할 때 Yanuka 등이 제안한 식을 적용하는 것이 바람직하며, $EC_w$를 계산할 때 이용되는 $EC_w$-$EC_a$ 상관관계식의 상수는 간단한 실험실내 보정 시험을 통해 구할 수 있음을 보여준다.
다단연소사이클 엔진 적용을 위한 Ni-Cr 코팅에 관한 연구
배병현(Byung-Hyun Bae),황양진(Yang-Jin Hwang),이규환(Kyu-Hwan Lee),이병호(Byong-ho Rhee),한영민(Yeoung-Min Han),김영준(Young-June Kim),노용오(Yong-Oh Noh),조황래(Hwang-Rae Cho),현성윤(Seong-Yoon Hyun),방정석(Jeong-Suk Bang) 한국추진공학회 2017 한국추진공학회 학술대회논문집 Vol.2017 No.5
본 논문은 다단연소사이클 엔진의 연소실 내벽을 고온, 고압의 환경으로부터 보호하기 위한 열차폐 코팅 공정 개발에 관한 내용이다. 기존 연소기 내벽에는 열차폐 특성이 우수한 Zr 기반의 세라믹용사코팅을 적용했지만, 세라믹의 특성상 연소실 내벽(금속)과 열팽창계수 차이로 인해 박리가 발생할 수 있다. 때문에 로켓 선진국에서는 열차폐 효과를 다소 희생 하더라도 밀착력 향상을 위하여 금속계 코팅인 Ni-Cr 도금을 적용하고 있다. 본 연구에서는 연소기에 적용 가능한 상향 순환식 유동셀을 적용한 도금조를 개발했으며, 반복적인 공정 개선을 통해 도금 두께 100㎛이상, ±10%의 두께 균일도를 만족하는 Ni, Cr 도금 공정조건을 확립했다. In this paper, the process of electro Ni and electro Cr plating is studied for the purpose of thermal barrier to protect the inner wall combustion chamber. The chamber is under the environment of very high temperature and high pressure when propellants burn in there. As one of the thermal barrier coatings, Zr-based thermal spray coating has been applied to the chamber. However, peeling of coating layer can occur under such a hard condition because of the difference of thermal expansion coefficients between the ceramic and the metallic wall. We study the characteristics of Ni-Cr coating and establish its process. It is found that the thickness of over 100 ㎛ of Ni and Cr coating layers with the uniformity of ±10% can be obtained with the used of as-developed plating bath.
식도정맥류 출혈의 치료에 대한 비용 대비 효과 - Modified Sugiura Procedure와 내시경적 치료의 비교 -
배병노 ( Byung Noe Bae ),양근호 ( Keun Ho Yang ),김홍용 ( Hong Yong Kim ),김기환 ( Ki Hwan Kim ),한세환 ( Se Hwan Han ),김홍주 ( Hong Joo Kim ),김영덕 ( Young Duck Kim ),신원창 ( Won Chang Shin ) 대한소화기학회 2003 대한소화기학회지 Vol.41 No.4
Background/Aims: According to current studies, the patients treated with modified Sugiura procedure show lower rebleeding rates compared with endoscopic therapy. The aim of this case-control study was to compare modified Sugiura procedure (transabdominal esophageal transection plus esophagogastric devascularization plus splenectomy) with endoscopic therapy for the prevention of recurrent variceal bleeding. Methods: Twenty patients were treated with surgery and 22 patients were treated with endoscopic therapy. We compared their outcomes. Measured main outcomes were mortality, variceal rebleeding, post-interventional changes of liver function, total hospital days, and total hospital charges. Results: Overall mortality in this series was not different. Bleeding related mortality and encephalopathy in the endoscopic therapy group were slightly higher than those in the surgery therapy group. However, these differences were not statistically significant. In patients treated with the modified Sugiura procedure, the liver function was remarkably improved after the operation. Rates of rebleeding (p<0.001), requiring additional endoscopy (p=0.016) and rehospitlalizations (p=0.008) were higher in endoscopic therapy group. In spite of initial lower cost, the overall costs of endoscopic therapy were higher than those of surgery if the costs for the prevention of variceal rebleeding was included. Conclusions: These results indicate that modified Sugiura procedure for esophageal variceal bleeding could improve therapeutic efficiency and quality of life of the patient, especially in the patients with good liver reservoir function. (Korean J Gastroenterol 2003;41:302-308)
배병열(Byung-Yeol Bae),이동근(Dong-Geun Lee),이두영(Doo-Young Lee),한병문(Byung-Moon Han) 대한전기학회 2007 대한전기학회 학술대회 논문집 Vol.2007 No.4
본 논문은 다계 H-브리지와 다권선 변압기를 이용하여 22.9㎸ 배전계통에 직접결합하여 전력품질을 보상하는 UPQC(Unified Power Quality Conditioner)를 제안하고 그 동작을 분석한 내용을 기술하고 있다. 제안하는 UPQC는 스위칭소자를 직결한 방식대신 H-브리지로 구성된 인버터모듈을 직결하는 방식으로 동작전압을 증가시켜 배전전압 22.9㎸에서 동작할 수 있도록 고안되어 있다. 제안하는 시스템의 기술적 타당성을 입증하기 위해 EMTDC 소프트웨어에 의한 시뮬레이션을 통한 분석을 실시하였으며 또한 하드웨어 축소모형을 제작하여 실험을 통한 분석을 실시하였다. 이러한 검증을 통하여 제안하는 UPQC는 실제규모로 용량을 확대하여 배전계통에 결합할 경우 동작이 가능할 것으로 보인다. 제안하는 UPQC는 배전전압에 따라 H-브리지 모듈의 수를 가감하여 설계의 유연성을 확보할 수 있고 직렬주입변압기가 없이 동작이 가능하여 기존 UPQC의 직렬주입변압기에 의한 제반 취약점을 제거할 수 있다.
Bae Byung-Han(배병한),Park Gi-Seok(박기석),김동훈, 이갑두 한국산업경영학회 2003 한국산업경영학회 발표논문집 Vol.- No.-
Many researchers have argued that success in today"s complex environments will be predicated on organizations becoming fast, flexible, and knowledge-based, and that one method of developing these characteristics is by employing teams. Teams can help that improving the organization"s speed and flexibility of response and the quality of the response. Because of these benefits of team-based organization, many organizations had adopted and have tried to adopt teams. But we had a question that whether teams are archived improving the team performance. If not, we have detected this reasons in performance measurement and compensation systems. Because, performance measurement and compensation systems can play an important role in teams success. Therefore, the purpose of this study is to confirm whether the interaction between team task exception and diversity performance measures, the weight given team performance in an individual"s compensation makes a significant influence on the team performance. We tested these questions using multiple regression analysis. According to the results, the interaction between task exception and three perspectives measures(exception for learning and growth perspectives) was significant. And the interaction between team task exception and the weight given team performance in an individual"s compensation was not significant.