http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
수중함용 2차전지-연료전지 추진체계의 성능 예측을 위한 M&S 연구
지현진,조성백,배중면,Ji, Hyunjin,Cho, Sungbaek,Bae, Joongmyeon 한국군사과학기술학회 2014 한국군사과학기술학회지 Vol.17 No.5
One of the most important devices in an underwater vessel is a propulsion system. It should be a quiet and efficient system for stealthy operations in the large mission area. Hence lead-acid battery system has been used to supply the energy to electric motor. Recent technological developments and improvements, such as polymer electrolyte membrane(PEM) fuel cell and lithium polymer battery and have created the potential to improve overall power and propulsion performance. An underwater vessel always starts their mission with a limited energy and is not easy to refuel. Therefore design of energy elements, such as fuel cell and battery, and their load distribution are important to increase the maximum operating time of underwater vessel. In this paper, the lead-acid battery/PEM fuel cell and lithium polymer battery/PEM fuel cell were suggested as propulsion system and their performances were analyzed by modeling and simulation using Matlab/Simulink. Each model concentrated on representing the characteristics of energy element depending on demand current. As a result the effect of load distribution between battery and fuel cell was evaluated and the operation time of each propulsion system was able to be estimated exactly.
고분자 전해질형 연료전지/2차전지/태양전지 하이브리드 자동차에 대한 모델링 및 특성평가
지현진(Hyunjin Ji),안효정(Hyojung Ahn),차석원(Sukwon Cha),배중면(Joongmyeon Bae) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.5
This Paper focuses on modeling and simulation to analyze the characteristic of hybrid vehicle. The system includes proton exchange membrane fuel cell(PEMFC), photovoltaic generator(PV), lead-acid battery, motor, vehicle and controller. Main electricity is produced by the PEMFC and battery to meet the requirements of a user load. When vehicle is parked in a sunny place, extra power is generated by the photovotaics and is charged in a battery for next drive. Further we evaluate usefulness of this hybrid vehicle by using ADVISOR - the advanced vehicle simulator written in the Matlab/Simulink environment. According to simulation results, the extra power obtained by photovoltaics which have been explored in nature conditions can help to reduce the electrical load of PEMFC and increase the efficiency (over 30%).
지현진(Hyunjin Ji) 한국콘텐츠학회 2012 한국콘텐츠학회논문지 Vol.12 No.6
본 연구의 목적은 무엇이 여가다운 여가인가를 되짚어 보고, 속도경쟁 사회에서 우리에게 진정으로 필요한 여가는 무엇인가에 대한 성찰의 기회를 제공하는 것이다. 이를 위해 주요 여가개념을 분석하여 이 개념안에 함축된 우리 사회의 가치판단을 읽어내고, 여가 본연의 가치를 회복하기 위해 필요한 논의를 전개하였다. 결론은 다음과 같다: 첫째, 자기계발과 사회통합 등 사회 순기능적 효과를 가져 오는 진지한 여가의 상대적 우월성을 강조하다보니 일상적 여가가 지닌 본연의 가치는 하향 평가되는 오류를 범하였다. 일상적 여가는 그 자체를 수행함으로써 삶의 균형을 이루려는 인간 본연의 욕구를 충족시켜줄 뿐 아니라 신체적, 심리적으로도 긍정적인 효과를 동반한다는 점을 간과하지 말아야 한다. 둘째, 진지한·일상적 여가의 이분법적 구조의 오류를 극복하기 위해 여가행위의 재연방식으로 정의한 빠른·느린 여가 개념에 대한 이론적 검토가 좀 더 세밀히 이루어져야 할 것이다. 셋째, 우리가 구태의연하고 생산적이지 못하다고 배척해온 삶의 방식도 그 자체를 구현함으로써 충분히 의미가 있다는 의식의 전환이 필요하다. This study is to explore what kinds of leisure we really need in our competitive speed society and what the true leisure should be like. The present researcher analyzed the concept of serious·casual leisure and its implications on our social values. The conclusions of this study are as follows: First, we might have made a mistake paying too much attention to serious leisure while ignoring the value of casual leisure, because serious leisure has been thought to produce positive effects on self-development and social integration. It is important to note that casual leisure could not only satisfy human’s need for balance in life and also contribute to her/his physical and psychological wellbeing. Second, In order to correct an error of sticking to the dichotomy of serious·casual leisure, the concept of fast·slow leisure, which defines leisure based on the way of its presentation, was also discussed. Third, the way of life which we considered unproductive should be reconsidered as it has a meaning in itself.
1.5kW급 PEMFC용 연료처리장치 내 수성가스치환반응기 시동시간 단축을 위한 수치해석
김근수(Keunsoo Kim),김선영(Sunyoung Kim),강인용(Inyong Kang),지현진(Hyunjin Ji),김영철(Youngchul Kim),배중면(Joongmyeon Bae) 대한기계학회 2011 대한기계학회 춘추학술대회 Vol.2011 No.10
A Proton Exchange Membrane Fuel Cell (PEMFC) system is spotlighted as a military power source, which has many benefits such as mobility, efficiency and quietness. PEMFC requires pure hydrogen as a fuel and on-board reforming is a realistic way to supply hydrogen. For that purpose fuel processor was developed, but is difficult to apply in real applications due to its relatively long start-up time. Two step Water Gas Shift(WGS) reactors consisting of high and low temperature reactors (HTS and LTS, respectively) mostly delay start-up time. The objective of present study is to develop and apply computational models and to design start-up protocol of WGS reactors. Transient temperature analysis was performed in each reactor with various boundary conditions. The start-up time highly depends on the wall condition and heat supply rate to WGS reactors. The start-up time is decreased with high heat supply rate. The temperature of the HTS reaches to the target very fast with the isothermal wall conditions, but the adiabatic wall condition is better for heating LTS. The optimized start-up protocol is suggested considering the results.