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이종준,김경학,김경준,김형준,Young Min Lee,신태호,한정우,이강택 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.103 No.-
(La,Sr)TiO3 has been investigated as a promising anode material for solid oxide fuel cells (SOFCs) owing toits high electronic conductivity and superior phase stability. However, the low catalytic activity of (La,Sr)TiO3 materials is a major obstacle to the application of SOFCs. Exsolution has emerged as an effectivestrategy to overcome the low catalytic activity of (La,Sr)TiO3 materials. In this work, Ni-doped A-sitedeficientLa0.4Sr0.4TiO3-d (LST) (i.e., La0.4Sr0.4Ti0.94Ni0.06O3-d; LSTN) with in-situ exsolved Ni nanoparticles(NPs) was developed and the effects of exsolved Ni NPs on H2 oxidation was investigated. The dopedNi was exsolved and formed NPs on the LSTN surface under reducing conditions. Owing to the high catalyticactivity of the exsolved Ni NPs, the SOFC with LSTN-Ce0.9Gd0.1O2-d (GDC) yielded a maximum powerdensity of 0.46Wcm 2 at 850 C, 91% higher than that of the cell with LST-GDC, as well as high long-termand redox stability. Furthermore, density functional theory calculations revealed that the adsorption anddissociation of H2 were more favorable for exsolved Ni NPs than for pure Ni owing to the more positivelycharged surface of the exsolved Ni NPs in the LSTN. These results demonstrated that exsolution is aneffective method for improving the electrocatalytic activity of perovskite (La,Sr)TiO3 materials.
이종준(Jong Joon Lee),윤재은(Jae Eun Yun),김동섭(Tong Seop Kim) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6
Operation of a 30㎾ class microturbine was simulated on the basis of component characteristic parameters obtained from performance test. Characteristic parameters, such as turbine inlet temperature, compressor and turbine efficiencies, recuperator effectiveness and generator efficiency, was obtained for a wide operation range using analysis based data reduction of the test result. Component characteristics such as performance maps and characteristic curves were generated using those data. Based on the component characteristics, operation of the microturbine was simulated for various operating condition and compared with measured performance parameters. The data obtained from the test and the simulation program will be used for performance diagnostics study.
Daphnia Pulex의 현장적용을 위한 최적의 배양조건 연구
이종준 ( Jong Jun Lee ),김태훈 ( Tae Hoon Kim ),권동민 ( Dong Min Kwon ),박재로 ( Jae Ro Park ),최이송 ( I Song Choi ),오종민 ( Jong Min Oh ) 한국수처리학회 2016 한국수처리학회지 Vol.24 No.1
Recently, algae concentration in the river and lake has been increasing continuously and in a rapid speed. Algae can be a discomfort to people and the secretion of toxic substances can adversely affect the ecosystem. There is a need to develop and apply improved water quality technologies in the environment to help to reduce the confusion that provoke the algae in the ecosystem. We studied the optimal conditions of Daphnia to apply it in the field of water improvement, by determining the optimum conditions that can be cultured in Daphnia, via the control of oxygen supply temperature and food to apply in fields of culture techniques. In this study it was found that the best set feeding food is 22 ml, with a final population of 1960 inds/L. In the aeration of the experiment, it was found that the most efficient DO concentration was 5.2 mg/L with an individual number of Daphnia of 1,200 inds/L. Regarding the water temperature, it was found that a range from 24℃ to 26℃ was the most appropriate the temperature of room cultured that doesn`t effect the scattering to increase the activity was determined to be 25℃.
이종준(J. J. Lee),윤재은(J. E. Yun),김동섭(T. S. Kim) 한국유체기계학회 2005 유체기계 연구개발 발표회 논문집 Vol.- No.-
This study aims at evaluation of component performance of a commercial micro gas turbine by detailed measurements of various system parameters. A test facility to measure performance of a micro gas turbine was set up. Performance parameters such as turbine exit temperature, exhaust gas temperature, engine inlet temperature, compressor discharge pressure and fuel flow rate were measured. Variations in measured data and estimated performance parameters were analyzed. In addition to overall engine performance, component characteristic parameters including the turbine inlet temperature, the compressor efficiency, the turbine efficiency, the recuperator effectiveness were estimated. Behaviors of the estimated characteristic parameters with operating condition change were examined.
이종준(J. J. Lee),김동섭(T. S. Kim) 한국유체기계학회 2004 유체기계 연구개발 발표회 논문집 Vol.- No.-
This study aims to analyze operating performance of a micro gas turbine with the aid of detailed measurements of various system parameters. In addition to embedded measurements, parameters such as exhaust temperatures, engine inlet temperatures and fuel flow rates are measured. Variations in measured data and estimated performance parameters are analyzed. Those data are processed to calculate losses along the power transmission line and the net gas turbine performance (power and efficiency based on the gas turbine shaft end) is isolated from the overall system performance. On the basis of the measured data, analytical approach is tried to estimate design characteristic and performance parameters such as component efficiencies and unmeasured temperatures.