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반사경 배치와 흡수기 형상에 따른 접시형 집열기 성능비교
마대성(Dae-Sung Ma),김용(Yong Kim),서태범(Tae-Beom Seo) 대한설비공학회 2006 대한설비공학회 학술발표대회논문집 Vol.2006 No.11
This article presents an analysis of a dish solar collector. This project investigates a perfect mirror(1.5 m diameter) and 5 arrays of 12 identical spherical mirror facets(0.4 m diameter). Five equal area(1.5 ㎡) with spherical reflector array configurations are designed and compared; Perfect mirror and 2AND4 INLINE, 2TOP, INLINE, STAGGERED. The surface reflectivity of each mirror varies from 0.75 to 0.95 and a focal length of the mirrors is 1.5 m. Also, this project has three different receivers(dome type, conical type, cylindrical type). The surface absorptivity and aperture diameter of the receivers is 0.9 and 0.15m, respectively. The incident solar flux is predicted using TracePro. Based on the ray tracing analysis, the performance of the dish solar collectors are estimated with different mirror arrays and receiver shapes. The results show that the dome type has the best performance in receiver shapes and the 2AND4 INLINE has the best performance in mirror arrays except perfect mirror.
흡수기 형상과 반사경 배치에 따른 접시형 집열기 성능평가
마대성(Ma Dae-Sung),김용(Kim Yong),서태범(Seo Tae-Beom),강용혁(Kang Yong-heack) 한국태양에너지학회 2006 한국태양에너지학회 학술대회논문집 Vol.- No.-
This article presents an analysis of a dish solar collector. This project investigates a perfect mirror(1.5 m diameter) and 5 arrays of 12 identical spherical mirror facets(0.4 m diameter). Five equal area(1.5 ㎡) with spherical reflector array configurations are designed and compared; Perfect mirror and 2AND4 INLINE, 2TOP, INLINE, STAGGERED. The surface reflectivity of each mirror varies from 0.75 to 0.95 and a focal length of the mirrors is 1.5 m. Also, this project has three different receivers(dome type, conical type, cylindrical type). The surface absorptivity and aperture diameter of the receivers is 0.9 and 0.15m, respectively. The incident solar flux is predicted using TracePro. Based on the ray tracing analysis, the performance of the dish solar collectors are estimated with different mirror arrays and receiver shapes. The results show that the dome type has the best performance in receiver shapes and the 2AND4 INLINE has the best performance in mirror arrays except perfect mirror.
마대성(Dae-Sung Ma),유진호(Jin-Ho You),김병기(Byung-Gi Kim) 한국정보과학회 1998 한국정보과학회 학술발표논문집 Vol.25 No.2Ⅲ
본 논문은 병렬 프로그램의 성능 분석을 위한 성능 감시기에서 가시화층의 일반화된 뷰를 설계하고 구현하였다. 대부분의 성능 감시기는 하드웨어에 의존적인 특성화된 뷰를 제공함으로서 이식성이나 확장성이 부족하다. 일반화된 뷰를 제공하는 성능 감시기는 데이터 필터층에서 필터링된 성능 분석 데이터를 이용하여 프로그래머가 정의한 데이터의 범의에 따라 뷰를 스스로 확장할 수 있다. 또한, CallBack 기능을 제공하여 관심 있는 데이터를 쉽게 볼 수 있다. 프로그래머는 성능 감시기의 일반화된 뷰를 이용하여 다양한 형태의 성능 분석결과를 볼 수 있다.
충돌 손상에 의한 첫 번째 늑골 골절에 동반된 Horner 증후군
마대성 ( Dae Sung Ma ),조현진 ( Hyun Jin Cho ),이정남 ( Jung Nam Lee ),전양빈 ( Yang Bin Jeon ) 대한외상학회 2014 大韓外傷學會誌 Vol.27 No.4
Patients with Horner’s syndrome exhibit a variety of symptoms, including miosis, palpebral ptosis, and anhidrosis. This syndrome is caused by interruptions of the sympathetic neural pathways. This paper describes two cases of patients with Horner’s syndrome who experienced a first rib fracture after crushing injuries. [ J Trauma Inj 2014; 27: 201-3 ]
김정랑,마대성,정성균,Kim, Jeong-Rang,Ma, Dae-Sung,Chung, Sung-Kyun 한국정보교육학회 2003 정보교육학회논문지 Vol.7 No.1
In elementary moral education, performance assessment should be conducted in both cognitive, affective, and behavioral domains in harmony. The present study attempts to consider the features of performance assessment in elementary moral education; classify them by the types of assessment, and; implement and apply the web-based performance assessment system, in which teachers, students, and parents all participate. The development of this web-based performance assessment system for elementary moral education allowed the students to carry out the performance assessment process by themselves and to see the result no matter when and where they are. The students became interested in their own behavior, and the parents got to have a broader range of understanding for their children by participating in personal in the assessment procedure. The parents also realized that home guidance for their children's life habits became pretty easy. It is expected that the performance assessment system carried out based on the collaboration between the school and the family will be helpful in applying the contents of the moral subject studied at school and the relevant knowledge and skills to the actual life outside the school.
반사경 배치 및 흡수기 형상에 따른 접시형 태양열 집열기의 복사 열손실 해석
서주현(Seo Joo-Hyun),마대성(Ma Dae-Sung),김용(Kim Yong),강용혁(Kang Yong-Heack),서태범(Seo Tae-Beom) 한국태양에너지학회 2007 한국태양에너지학회 학술대회논문집 Vol.- No.-
The radiative heat loss from a receiver of a dish solar collector is numerically investigated. The dish solar collector considered in this paper consists of a receiver and multi-faceted mirrors. In order to investigate the performance comparison of dish solar collectors, six different mirror arrays and four different receivers are considered. A parabolic-shaped perfect mirror of which diameter is 1.40 m is considered as the reference for the mirror arrays. The other mirror arrays which consist of twelve identical parabolic-shaped mirror facets of which diameter are 0.405 m are suggested for comparison. Their reflecting areas, which are 1.545 ㎡, are the same. Four different receiver shapes are a conical, a dome, a cylindrical, and a unicorn type. The radiative properties of the mirror surfaces and the receiver surfaces can vary the thermal performance of the dish solar collector so that various surface properties are considered. The Net Radiation Method that is based on the radiation heat balance on the surface is used to calculate the radiation heat transfer rate from the inside surface of the receiver to the environment. The Monte-Carlo method that is the statistical approach is adopted to predict the radiation heat transfer rate from the reflector to the receiver. Based on the calculation, the unicorn type has the best performance in receiver shapes and the STAR has the best performance in mirror arrays except the perfect mirror.
서주현(Seo Joo-Hyun),마대성(Ma Dae-Sung),김용(Kim Yong),서태범(Seo Tae-Beom),한귀영(Han Gui-Young) 한국태양에너지학회 2007 한국태양에너지학회 논문집 Vol.27 No.4
The 5㎾t dish solar collector is designed and the preliminary performance test for this is carried out. The diameter of the parabolic dish is 3.2 m, and its focal length is 2 m. It consists of 10 small reflectors which have their own curvatures, and the effective reflecting area is 5.9 ㎡, and the rim angle of the dish is 43.85°. The reflectivity of reflectors is 0.95, and the thermal capacity of the system is about 5 ㎾ thermal. The aperture diameter of the cylindrical-shape receiver which is made of stainless steel is 100 ㎜, and the height is 210 ㎜. A quartz window is installed at the receiver aperture to minimize the convective heat loss and prevent air leakage. In order to increase the heat transfer area, porous materials (nickel-alloy) are inserted into the receiver. Air flows into the upper part of the receiver which is the opposite side of the aperture. After the air flows through the inside of the receiver, that goes out of the receiver through 3 exits which are located near the aperture. The volumetric flow rates of air are varied from 600 to 1200 L/min. The results show that the system efficiency and receiver efficiency increase as the volume flow rate increases.
반사경 배치 및 흡수기 형상에 따른 접시형 태양열 집열기의 열손실 해석
서주현(Joo-Hyun Seo),마대성(Dae-Sung Ma),김용(Yong Kim),강용혁(Yong-Heack Kang),서태범(Tae-Beom Seo) 대한설비공학회 2008 설비공학 논문집 Vol.20 No.1
The radiative heat loss from a receiver of a dish solar collector is numerically investigated. The dish solar collector considered in this paper consists of a receiver and multi-faceted mirrors. In order to investigate the performance comparison of dish solar collectors, six different mirror arrays and four different receivers are considered. A parabolic- shaped perfect mirror of which diameter is 1.40 m is considered as the reference for the mirror arrays. The other mirror arrays which consist of twelve identical parabolic-shaped mirror facets of which diameter are 0.405 m are suggested for comparison. Their reflecting areas, which are 1.545 ㎡, are the same. Four different receiver shapes are a conical, a dome, a cylindrical, and a unicorn type. The radiative properties of the mirror surfaces and the receiver surfaces may vary the thermal performance of the dish solar collector so that various surface properties are considered. In order to calculate the radiative heat loss in the receiver, two kinds of methods are used. The Net Radiation Method that is based on the radiation heat balance on the surface is used to calculate the radiation heat transfer rate from the inside surface of the receiver to the environment. The Monte-Carlo Method that is the statistical approach is adopted to predict the radiation heat transfer rate from the reflector to the receiver. The collector efficiency is defined as the results of the optical efficiency and the receiver efficiency. Based on the calculation, the unicorn type has the best performance in receiver shapes and the STAR has the best performance in mirror arrays except the perfect mirror.