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장승재,김동완 신라대학교 자연과학연구소 1999 自然科學論文集 Vol.7 No.-
Nowadays, it is common and will be more often trend toward building and building equipment system to be reinstalled newly because of low of utility value as to deterioration and obsolescence. Building equipment system which is used for the amenity of indoor environment is composed of various components and their assemblies, and that is cause of not only renewed installation but also cost for solving them. It is shown as confused making-decision processes when the renewed equipment scheme of building proceeds. So, it is necessary and useful to evaluate them closely. therefore, this study is aimed to set renewal evaluation criteria of each sub equipment system for corrected renewal evaluation.
空調設備 冷熱原시스템 更新에서 最適 代案시스템 選定을 위한 評價 硏究
장승재,김동완 신라대학교 자연과학연구소 1999 自然科學論文集 Vol.6 No.-
The renewal for the primary cooling system of existing office building requires to consider many factors such as life cycle cost factor, resource use factor, functional factor, indoor quality factor, architectural quality factor and environmental factor. However the current renewal method mostly considers only the simple economic factor even not taking into account the life cycle of the equipment. And, therefore, it could not evaluate the integrated performance of various optional renewal cases. The purpose of this paper is to introduce a statistical method - AHP(analytic hierarchy process) and to evaluate three optional cooling renewal cases such as turbo compression type, thermal storage type and absorption type for office building.
장승재,김동완 新羅大學校 1999 論文集 Vol.47 No.-
Super high-rise apartment, being a new housing pattern, have constructed a kind of building that increased in number and elevation, due to such as an economical use of land, a decrement of construction cost, a necessity of reorganization for urban district, a new urban life cycle of residents. Therefore, this study is aimed at investigating the residential character, and analysed the safety of residence, resident's satisfaction, and psychological behavior to compare super high-rise apartment above 20 stories with high-rise apartmenr below 15 stories in Pusan. Compared super high-rise apartments with high-rise apartments, residents in super high-rise apartments have been prefered to the super high-rise apartment and below 10stories, on the other gand, have been dissatisfied with the children's living, psychological stabilities in the safety of residence and psychological behavior aspects. Specially, super high-rise apartments have large problems such as the high possibility of accidents in balcony, the occurrence of wind noese, and the vibraftion of buildings in the safety of residential consciousness aspect.
空氣調和시스템 更新評價를 위한 意思決定方案에 관한 연구
장승재,김동완 신라대학교 자연과학연구소 1998 自然科學論文集 Vol.5 No.-
Recently, renewal requirements resulted from obsolescence and deterioration of buildings and mechanical systems show a tendency to increase. On this point of view, the purpose of this study is to establish theoretical evaluation methodology of renewal plan of building HVAC system, such as renewal acceptance or rejection, renewal cost, renewal priority order. Failure rate, operating inferiority, adverse minimum and urgency rating were selected and used for evaluation factors of AHP(Analytic Hierarchy Process) which used in this study. Renewal evaluation by AHP will be come into provide successful methods to plan economical maintenance and renewal scheme.
치료용 방사선의 입사각에 따른 광섬유 방사선량계의 체렌코프 빛 측정 및 분석
장경원,조동현,유욱재,신상훈,서정기,이봉수,박병기,문주현 제주대학교 방사선응용과학연구소 2008 방사선응용과학연구소논문집 Vol.22 No.-
In this study, we have measured scintillating light generated in a fiber-optic dosimeter by high energy photon and electron beams using a charge-coupled device. The intensity of Cerenkov lights are also measured and characterized as functions of incident angles and energies of the high energy beams from a clinical linear accelerator. To minimize or remove Cerenkov light, a simple subtraction method using a background optical fiber and wavelength discrimination method using optical filters are investigated. Also, the intensities of Cerenkov light induced by high energy photon and electron beams are compared.
Oil과 Modified Styrene을 使用한 微粒 無煙炭의 凝集
張東星,李載長 江原大學校 産業技術硏究所 1989 産業技術硏究 Vol.7 No.-
Fine anthracite is very difficult to upgrade by conventional processes such as gravity concentration or froth flotation, because large quantities of fine coals are generated at the mining and preparation stages and a significant portion of these fine coals are mixed with gangue minerals. This study, therefore, was carried out for the purpose of improving recovery of low ash clean coal, effective beneficiation of low-grade coking coal and removal of sulphur from high-sulphur coals by employing the method of selective agglomeration using oil or polystrene flocculants, for coals which are generally hydrophobic in nature will be extracted by using flocculants. Studies were performed by varying solid concentraion concetration of bridging liquid, mixing speed and mixing time, balling speed and balling time, dispersant dosage, flocculant dosage, pulp pH, and particle size. The results were : when the methods of the oil agglomeration and selective flocculation were employ(in the two process the sample was ground to the size of -74 micron), 1) ash content of the agglomerated coal was 9.85, 7.83%, 2) combustibel recovery of it was 98.5%, 93.5%, respectively. It was observed in selective flocculation that polystyrene is an effective flocculant for coal, De-entrapment of shale from the concentrate flocculated by mechanical agitation was necessary for substantional reductions in final ash content.
충진탑에서 가스흡수에 의한 물질전달과 수력학적 거동에 관한 연구
최동훈,김재홍,김일배,김옥택,김장호 동아대학교 환경문제연구소 1997 硏究報告 Vol.20 No.1
The use of packed column which apply efficient thermal material separation method has been required for absorption process. Absorption is applicable to waste gas from industrial process and incineration and odor control. Since we have used the lattice packing which was recently discovered in Germany, We can prevent drop of efficiency from maldistribution and channeling which were occurred when we use conventional packing. The lattice packing is efficient within the range of thermal, easy to manufacture, low production cost and make a variety of materials. This study aims to control the waste gas and odor with absorption. The dimension of packed column in which used in experiment is 0.45(d) × 2.0 m(H), and the result of and mass transfer apply to practical industry and environmental protection. The systems adopted for the absorption are Air/Water and NH3-Air/Water. We still cannot apply packed column to the domestic industry and environmental protection and depend on foreign technology, but this study will contribute to the industry and environment.