신경 회로망을 이용한 Buck Type콘버어터의 출력 전압 제어에 관한 연구

배상준,김동희,이달해 嶺南大學校 工業技術硏究所 1993 工業技術硏究所論文集 Vol.21 No.2

A novel Neural networks controller for Buck type DC-DC converter is presented and compared with the operation of sliding mode coupled several control strategies for the converter. The connection weights of neural network are trained by error back propagation algorithm and the trained neural network is applied to the converter control. In this paper, each quantity is normalized in order to reduce complexity of both theoretical analysis and design for the converter. The behavior of the control system that arises from the use of those methods is analyzed from the viewpoint of dynamic and steady state errors and Simulation results are presented.

고정층과 순환유동층에서 CaSO_4의 환원반응에 대한 온도와 CO농도의 영향

배달희,류호정,박재현,이창근,선도원,이동규 한국화학공학회 2003 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.41 No.1

순환유동층 석탄연소로에서 석회석에 의한 찰황반응에 영향을 미치는 CaSO_4의 환원반응에 의한 SO-2 재배출을 실험적으로 확인하고 SO_2의 재배출에 미치는 온도와 CO 농도의 영향에대해 상용 순환유동층에 적용할 수 있는 기초자료를 확보하기 위해 고정층과 순환유동층에서 층물질로 석회석과 상용 순롼 유동층 하부회를 이용하여 환원실험을 수행하였으며 CaSO_4의 환원반응에 미치는 온도와 CO의 영향을 측정 및 해석하였다. 고온조건에서 CO가 환원제로 작용하여 C_aSO_4로부터 SO_2가 재배출되는 현상을 확인하였으며 CaSO_4로부터 SO_2의 재배출은 온도와 CO농도가 증가함에 따라 증가하였다. 본 실험의 결과에 의해 온도가 증가함에 따라 석회석에 의한 탈황율이 감소하는 현상을 환원이론으로 설명할 수 있다는 것이 확인되었다. For qualitative understanding of the sulphur capture process in a circulating fluidized bed fumace, the effects of temperature and CO concentration on the reactivity of partially sulfated CaO were experimentally examined. The tests were performed in a fixed bed reactor and lab-scale circulating fluidized bed reactor. The materials used were partially sulfated domestic limestone and bottom ash drained from commercial circulating fluidized bed furnaces. The re-emission of SO_2 from partially sulfated limestone and bottom ash increases with temperature as well as with concentration of the reducing agent CO. From the results of this study, the temperature dependence of sulfation could be explained by reduction theory.

LCC형 고주파 공진 인버터의 특성 해석

김동희,이달해,배상준 嶺南大學校 工業技術硏究所 1995 工業技術硏究所論文集 Vol.23 No.2

This paper proposes LCC type high frequency resonant inverter to be used as a source of induction heating device or ultrasonic device and considers of operating characteristic for it. The inverter is operated safely over wide range load, because it has both paralel loaded capacitor and series loaded capacitor. Then, switching frequency of the inverter is controlled by feedback voltage and current in order to have constant output power even when load is varied.

21世紀 體育, Sports의 方向摸索을 위한 小考

李喆熙,裵元煥,李達源 啓明大學校 生活科學硏究所 1993 科學論集 Vol.19 No.-

This study was investigated for the purpose of conereting the arm of the physical education and acquiring intrinsic area of the physical education and contributing human culture in highly developed industrial society of the future. The conclusions were summerized as follows; In highly developed industrial society, sports activity for health and leisure by changing of physical education environment will be increased. The mass sports and sports science which social group carrys out positively will be accelerated. With recognition change for physical education, Eco-sports will be important sports. By developing sports scientification, Techno-sports will be more developed. The attitude and a view of value of the people for the sports will be more promoted. The conception of Pro-sports will be changed and the acceleration of political tool of physical education will be done in international sports. The role of physical education scientists who have the specialization and self-confidence of academy and deep experience will be large.

오존 발생기용 전원장치 개발 및 특성에 관한 연구

김동희,이달해,성현직,오승훈,이봉섭,배상준 嶺南大學校 工業技術硏究所 1997 工業技術硏究所論文集 Vol.25 No.1

The power semiconductor switching devices(PSSD) continuously developed, Power Electronic Technology using PSSD is gradually extended. The high frequency inverter to generate the large power high frequency subject to power electronic technology pursuit various application. Also, in emboss with environmental destruction problem cause the atmosphere and the water pollution to growth of the commercial society, the research in favor of cleansing environmental a pollutant actively proceed. Cause of having a strong oxygenization in the physical world, the ozone has sterillization effect predominantly against virus, bacteria, etc and has application in decolorization, deodorization, food storage and air cleansing and has a merit that does not cause the secondary pollution by being restored to oxygen lastly. Therefore, This project describe study on the ozone generation power supply using the high frequency electric field method and the lamp type ozone generator using photochemistry, one of method of generate ozone.

경연 대회를 통한 초ㆍ중고생의 창의력 신장 효과에 관한 연구

이희복,육근철,류해일,김현섭,김희수,박달원,유병환,김선효,김여상,서광수,변두원,서명석,배성효,박종석,심규철,이성희 공주대학교 과학교육연구소 2001 과학교육연구 Vol.32 No.1

미래 사회를 대비하기 위한 개인의 개성을 존중과 창의적인 능력을 지닌 인간을 양성을 목적으로 충청남도 지역의 초 ㆍ 중고등학생들을 대상으로 한 창의력 경연대회가 공주대학교 과학교육연구소에서 개최되었다. 충청남도 초 ㆍ중 ㆍ 고등학생들을 대상으로 실시한 창의력 경연대회는 창조적 아이디어를 내어 스스로 문제를 해결해 나갈 수 있는 교육 프로그램을 제공하는 좋은 기회였음이 확인되었으나, 일부의 팀에서만 참신하고 재미있는 아이디어들이 제안되었다. 여학생의 참가자 수가 상당히 증가하였으며, 대체적으로 입상권의 학생들의 상당 부분이 여학생이라는 것이 특이할만하다. 학년이 올라감에 따라서 창의적인 아이디어를 내는 양이나 질에 있어서 뒤떨어지는 것으로 분석되었으며, 토론 학습의 적응력이 미흡하고 발표력 및 청취력에 있어서도 떨어지는 것으로 나타났다. 따라서 중 ㆍ고등학교의 학교교육에서도 학생들에게 프로젝트형 탐구학습 프로그램의 적용은 물론 토론식 수습을 통한 학생들의 사고의 전환의 기회를 제공해야 할 것으로 사료된다. The creativity competition was held to foster the creativity of elementary and secondary school students in the Institute of Science Education, Kongju national University. It was found that the creativity competition effected on the improvement of inventing creative ideas and problem solving activities. But, only some competitors participated in semifinal and final contests, presented original and interesting ideas. More female students participated in competition than last year. More female participants were awarded a prize than males. Totally, participants were defective in discussion and communication, and presentation and listening ideas. Increasing grades correlated inversely with creativity and originality. There is need of inquiry project teaming programs and presenting opportunities of conversion of thinking by discussing instructions in school

신경회로망을 이용한 전력 변환장치의 제어

김동희,배상준,이달해 嶺南大學校 工業技術硏究所 1994 工業技術硏究所論文集 Vol.22 No.1

Some methods of appling to a control system and basic concept about the neural networks are presented, and some methods of training neural networks and back propagation algorithm, which updates weight for reduced output error, are described in this paper. Methods of constructing a control system of power conversion devices using feedforward of recurrent neural networks are presented through some examples. A behavior of controlled conversion devices with that control system is considered by the computer simulation.

매체순환식 가스연소기 적용을 위한 Ni계 및 NiO계 산소공여입자의 반응특성

류호정,배달희,조성호,진경태 한국화학공학회 2004 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.42 No.1

매체순환식 가스연소기에 적용하기 위한 최적의 산소공여입자를 결정하기 위해 금속산화물(NiO)의 함량 변화에 따라 네 가지 (NiO 26, 44, 58, 78wt%)의 산소공여입자를 제조하여 열중량 분석기에서 환원반응특성을 측정 및 비교하였다. 제조된 입자들 중에서 NiO 약 60wt%인 입자가 산소전달능력 및 반응속도 면에서 다른 입자들에 비해 우수한 성능을 나타내었다. 산소공여입자의 제조과정에서 금속산화물 형태의 영향을 살펴보기 위해 금속산화물의 출발물질로 Ni과 NiO를 사용하여 NiO 함량이 동일한(약 60%) 두 종류의 입자를 제조하였으며 열중량 분석기와 고정층 반응기를 이용하여 반응속도, 재생성, 환원반응 유지시간 및 CO_(2) 선택도 등을 측정 및 고찰하였다. 금속산화물의 출발물질로 NiO를 사용한 입자가 Ni을 사용한 입자에 비해 반복 실험시에 정상반응조건에 빨리 도달하였고 반응속도와 CO_(2) 선택도가 높았으며 환원반응 유지시간인 길게 나타났다. 실험결과에 의해 본 연구에서 고려한 산소공여입자 중에서 금속산화물의 출발물질로 NiO를 사용한 NiO 함량이 60wt%인 입자를 최적의 산소공여입자로 선정하였다. To find a suitable oxygen carrier particle for chemical-looping combustor, four kinds of particles (NiO 26, 44, 58, 78wt%) were prepared and the reactivity of the reduction was measured and investigated by a thermo-gravimetrical analyzer. From the viewpoint of oxygen transfer capacity and reaction rate, the particle containing 60wt% of NiO showed better performance than the other particles. Also, we have prepared two kinds of oxygen carrier particles to investigate the effect of the starting material for a metal oxide component(i.e., Ni based and NiO based particles, where the weight percents of both samples were set at 60wt% as NiO). The reaction rate, regenerative ability, duration of the reduction, and CO₂ selectivity were easured and investigated by a thermo-gravimetrical analyzer and a fixed bed reactor. The results obtained here indicated that the NiO based oxygen carrier particle containing 60wt% of NiO showed better regenerative ability, reaction rate, CO₂ selectivity, and duration of the reduction, compared with the other particles, therefore we selected this particle as an optimum oxygen carrier particle.

국내무연탄 연소에 따른 순환유동층내의 열전달 특성

선도원,배달희,조성호,박영성 大田大學校 産業技術硏究所 1997 산업기술연구소 論文集 Vol.8 No.1

순환유동층 시험연소로에서 국내무연탄의 연소에 따른 연소로 내벽의 열전달 특성을 고찰하였다. 연로소의 온도변화 및 층밀도의 변화에 따른 전열계수의 변화를 측정하였다. 한편 전열모델을 구성하고 그 계산치를 실험결과와 비교하였다. 또한 복사 전열에 대한 고찰을 통해 순환유동층 열전달에 미치는 복사의 영향을 추정하였다. Bed to wall heat transfer in a both scale circulating fluidized bed was studied. Domestic anthracite was burned to heat the combustor. Variation of heat transfer rate with combustor temperature, bed density was monitored. Test result was compared with a proposed heat transfer model and radiation effect in heat transfer was predicted

매체순환식 가스연소기 산소공여입자의 최소유동화속도 및 고속유동층으로의 전이유속

류호정,임남윤,배달희,진경태 한국화학공학회 2003 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.41 No.5

기포유동층과 고속유동층의 2탑 연결 가압순환유동층으로 조업되는 매체순환식 가스연소기의 설계와 조업조건 선정을 위해 산소공여입자의 최소유동화속도와 고속유동층으로의 전이유속을 측정 및 고찰하였다. 층물질로 매체순환식 가스연소기의 산소공여입자인 NiO/bentonite (평균입경 : 0.181 mm, 입자밀도 : 4,080 kg/㎥)를 사용하여 가압 기포유동층(내경 0.052 m, 높이 1.66 m)에서 층압력강하를 측정하여 온도(25-1,000℃)와 압력(1-6 atm)의 변화에 따른 최소유동화속도의 변화를 측정 및 고찰하였고 고온순환유동층(내경 0.02 m, 높이 2.0 m)에서 emptying time method에 의해 고속유동층으로의 전이유속(U_(tr))에 대한 온도(25-600℃)의 영향을 측정 및 고찰하였다. 측정된 최소유동화속도는 온도와 압력이 증가함에 따라 감소하였으며, 고속유동층으로의 전이유속은 온도가 증가함에 따라 증가하였다. 최소유동화속도와 고속유동층으로의 전이유속에 대한 본 실험의 측정값을 기존의 상관식과 비교하였으며 기존 상관식을 바탕으로 수정된 상관식을 제시하였다. In order 10 design and select appropriate operating conditions for the practical operation of chemical-loaping combustor, which consists of two interconnected fluidized beds (bubbling fluidized bed and fast fluidized bed), minimum fluidization velocity and transition velocity to fast fluidization were measured and investigated. Oxygen carrier particle of NiO bentonite particle (specific surface mean diameter: 0.181 mm, particle density: 4,080 ㎏/㎥) was used as a bed material. The minimum fluidization velocity was determined by measuring the bed pressure drop in the pressurized fluidized bed (0.052 m i.d. and 1.66 m high) with variations of temperature (25-1,000℃) and pressure (1-6 atm). The transition velocity from bubbling to fast fluidization was determined by means of emptying tim method in the high temperature circulating fluidized bed (0.02 m i.d. and 2.0 m high) with variation of temperature (25-600℃). The measured minimum fluidization velocity was increased with increasing temperature and pressure. The measured transition velocity to fast fluidization was increased with increasing temperature. The previous correlations on the minimum fluidization velocity and transition velocity to fast fluidization were compared with the present measured values to develop new correlation.