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이원용,김민진,오환영,손영준,김승곤,LEE, WON-YONG,KIM, MINJIN,OH, HWANYEONG,SOHN, YOUNG-JUN,KIM, SEUNG-GON 한국수소및신에너지학회 2018 한국수소 및 신에너지학회논문집 Vol.29 No.4
Although fuel cell systems have advantages in terms of electric efficiency and environmental impact compared with conventional power systems, fuel cell systems have not been deployed widely due to their low reliability and high price. In order to guarantee the lifetime of 10 years, which is the commercialization goal of Polymer electrolyte fuel cells (PEFCs), it is necessary to improve durability and reliability through optimized operation and maintenance technologies. Due to the complexity of components and their degradation phenomena, it's not easy to develop and apply the diagnose and prognostic methodologies for PEFCs. The purpose of the paper is to show the current state on PEFC prognostic technology for condition based maintenance. For the prognostic of PEFCs, the model driven method, the data-driven, and the hybrid method can be applied. The methods reviewed in this paper can contribute to the development of technologies to reduce the life cycle cost of fuel cells and increase the reliability through prognostics-based health management system.
잣나무 Fibril 경사각의 (傾斜角) 변이에 관한 연구
이원용,권진헌 ( Won Young Lee,Jin Heon Kweon ) 한국산림과학회 1980 한국산림과학회지 Vol.46 No.1
The purpose of this study was carried out to examine the systematic trends in fibril angle which existed within the trunk of Pinus koraiensis Sieb. et Zucc. In 1937 I.W.Bailey reported that crystalline aggregates of iodine may be induced to form within the elongated interstices of the cellulose matrix of the secondary wall, and that these elongated crystals are oriented parallel to the long axis of the fibrils of cellulose. The authors tried a simple method (Yaichi kobayashi method) of demonstrating the fibrillar orientation in lignified walls in which Schulze`s reagent was used. The results were summarized as follows. 1. Fibril angles were greater for earlywood (avg. 23.38°) than for latewood (avg. 17.85°). 2. The average fibril angles of consecutive rings decreased consistently and markedly from pith to bark. 3. Differences of the fibril angle between in springwood and in summerwood were greater in corewood than in middle or outerwood.
김혁,유재현,서필원,이원용,백완기,박국양,이영탁,박영관,홍승록,이영균,Kim, Hyuk,Yu, Jae-Hyeon,Seo, Pil-Won,Lee, Won-Yong,Baek, Wan-Ki,Park, Kook-Yang,Lee, Young-Tak,Park, Young-Kwan,Hong, Sung-Nok,Lee, Yung-Kyoon 대한흉부심장혈관외과학회 1994 Journal of Chest Surgery (J Chest Surg) Vol.27 No.4
Between 1985 and 1993, 29 children from 1 to 15 years of age have undergone cardiac valve replacements at Buchon Sejong Hospital. The patients were composed of 20 males and 9 females and 17 patient had congenital heart disease and 12 patients had acquired heart disease. Two of these patients have had second valve replacements due to paravalvular leakage and valve thrombosis. Single valve replacements were 29 and double valve replacements were 2. All the patients had received prosthetic valves except one. Among the 25 patients who had definite post-operative records, the overall mortality was 12%[4% was early mortality and 8% was late mortality].25 patients were followed up with coumadin anticoagulation for total 633 patient-months[minimum 2 months to maximum 93 months, mean 25.3 months] and actuarial survival rate was 88.5 $\pm$ 6.3% at 7 years and event free rate was 70.3 $\pm$ 11.7% at 7 years. These results suggest that pediatric valve replacements can now be performed at a low operative risk although various problems are still remained and the choice of valve is prosthetic valve mainly due to its durability at the present time.
고온 고분자연료전지 기반 삼중열병합 시스템의 이론적 해석
이원용(Won-Yong Lee),김민진(Minjin Kim),손영준(Young-Jun Sohn),김승곤(Seung-Gon Kim) 한국신재생에너지학회 2017 신재생에너지 Vol.13 No.2
Model equations for a combined system with a high temperature polymer electrolyte fuel cell (HT-PEFC) system and an absorption heat pump (AHP) system were derived analytically. An AHP is proposed as a bottoming cycle system to utilize efficiently the waste heat from a fuel cell stack for cooling and heating purposes. The four-heat-reservoir model with a work conversion constraint was used to calculate the equivalent power output of the AHP. To calculate the AHP performance analytically, a modified irreversible Carnot cycle coupled to heating and cooling fluids with a finite heat capacity rate was considered. By combining the AHP system with the HT-PEFC system, the equivalent electric power was improved by 26% to 33% according to the load conditions. The COP values ranged from 1.0 and 1.2 for cooling purposes and from 2.0 to 2.2 for heating purposes. By combining with the AHP, the annual heat utilization rate can be improved compared to a single fuel cell system. The methods proposed in this paper can provide a useful measurement of the performance available in a practical fuel cell-based hybrid power system without complex numerical calculations.
이원용(Won Yong Lee),안형준(Hyung Joon Ahn),오영석(Young Suk Oh),문태섭(Tae Sup Moon) 한국강구조학회 1991 韓國鋼構造學會誌 Vol.3 No.4
In the allowable stress design, steel members have to be secured a larger than normal strength and the compressed plate of steel than yield strength. Specially, structural members have to be secured strength and deformation capacity in plastic design or aseismic design. Therefore the estimation of structural members is basic and important. In order to find out the maximum strength and deformation capacity, the test and analysis are carried out. Specimens are stub-column and beam. A cross section used in test is cold formed square hollow section steel members and the parameter of specimen is Width-Thickness-Ratios. The purpose of this paper is to obtain limiting Width-Thickness-Ratios in accordance with a required deformation capacity in structural steel design.
고온 고분자연료전지와 유기랜킨사이클 복합 발전시스템 이론적 해석
이원용(Won-Yong Lee),김민진(Minjin Kim),손영준(Young-Jun Sohn),김승곤(Seung-Gon Kim) 한국신재생에너지학회 2016 신재생에너지 Vol.12 No.2
Model equations of a combined system with a high temperature polymer electrolyte fuel cell (HT-PEFC) system based on phosphoric acid (PA)-doped polybenzimidazole(PBI) membranes and a heat recovery power system were derived. In this study, an organic Rankine cycle system (ORCS) was proposed as a bottoming cycle system to convert the waste heat from a fuel cell stack to electric power. To optimize the combined system, the efficiency at the maximum power of the heat recovery system was derived. To calculate the ORCS performance analytically, a modified Carnot cycle coupled to heating and cooling fluids with a finite heat capacity rate was considered using the entropic average temperature. This simple equation does not require any detailed thermodynamic data of organic working fluids. By combining the ORCS with the HT-PEFC system, the electric power was improved by 6% to 8% according to the load conditions. As the fuel cell load is increased, the efficiency of the fuel cell is decreased, but the contribution of the heat recovery power system to the total combined system efficiency was increased due to the increased waste heat produced in the stack. The methods proposed in this paper can provide a useful measurement of the performance available in practical fuel cell-based hybrid power systems without complex numerical calculations.
한국산(韓國産) 활엽수재(闊葉樹材) 천공판(穿孔板)의 미세형태(微細形態)에 관(關)한 연구(硏究) (II) - 천공판(穿孔板)의 구조(構造) -
김대영,이원용,Kim, Dae-Young,Lee, Won-Yong 강원대학교 산림과학연구소 1997 Journal of Forest Science Vol.13 No.-
우리나라산(産) 활엽수재 25과(科)45속(屬)78종(種)의 수종에 대하여 천공을 이루고 있는 구조를 주사전자현미경(SEM)을 사용하여 3차원적(次元的) 형태를 관찰하고, 이들의 미세한 천공구조의 본질을 조사하여 과(科), 속(屬), 종별(種別)로 고유의 특징을 구명하기 위하여 본 연구를 실시 하였으며 천공의 분류는 단천공(單穿孔), 계단천공(階段穿孔) 및 다공천공(多孔穿孔)(계단천공(階段穿孔) 이외의 다공천공(多孔穿孔))의 3가지로 구분하고 이것을 기초로하여 (1) 단천공(單穿孔)만을 갖는 수종(60종), (2) 계단천공(階段穿孔)만을 갖는 수종(5종), (3) 단천공(單穿孔)과 계단천공(階段穿孔)을 갖는 수종(4종), (4) 단천공(單穿孔)과 다공천공(多孔穿孔)을 갖는 수종(2종), (5) 계단천공(階段穿孔)과 다공천공(多孔穿孔)을 갖는 수종(5종), (6) 단천공(單穿孔), 계단천공(階段穿孔) 및 다공천공(多孔穿孔)을 갖는 수종(2종)의 6개의 그룹으로 분류 하였다. 그 결과 Betulaceae에 속하는 수종은 대부분이 계단천공(階段穿孔)을 나타내고 있으나 개서어나무에서는 단천공(單穿孔)이 출현하는 특징이 있으며, Fagaceae의 갈참나무에서는 단천공(單穿孔)의 천공연(穿孔緣)의 주연에 돌기물이 발생된 vesture천공이 관찰 되었다. 또한 계단천공(階段穿孔)의 상하의 bar가 서로 일치되고 있지않은 mismatching perforation plate가 물갬나무와 물오리나무에서 관찰되었으며 또한 계단천공의 bar사이에 벽물질이 남아 일부 또는 전부가 막혀 있거나 microfibrillar 모양의 substructure가 물박달나무와 계수나무에서 발견되었다. Perforation plate was observed in 78 species(45 genera, 25 families) of Korean native hardwoods using SEM and it was divided into three types, i.e., simple, scalariform and multiple perforation plates, Based on occurance of these types, the species examined were classfied into the following six groups : (1) 60species(35 genera, 21 families) having exclusively simple perforation, (2) 5 species(2 genera, 1 families) having exclusively scalariform perforation plates, (3) 4 species(4 genera, 3 families) having simple and scalariform perforation plates, (4) 2 species(2 genera, 1 families) having simple and multiple perforation plates, (5) 5 species(3 genera, 3 families) having scalariform and multiple perforation plates and (6) 2 species(2 genera, 2 families) having simple, scalariform and multiple perforation plates. Mismatching perforation plates were found in two species of Betulaceae, Alnus hirsuta var. sibirica and Alnus hirsuta and peculiar substructure between the bars of the scalariform perforation plate was observed in Betulaceae, Betula davurica and Cercidiphyllaceae, Cerdiphyllum japonicum and the vestured perforation plate was found in Quercus aliena.