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문학작품에 투영된 갈등구조 연구 - 홍길동전을 중심으로 -
손길원 京畿專門大學 1999 京畿專門大學 論文集 Vol.- No.27
The aim of this study is to consider the structural contradictions reflected within any literary work. When we constantly read and interpret literary works from a new perspective. It is important for us to study the structural contradictions reflected in the work, Hong Gil Dong which can be called as a classical literature. When we understand and evaluate old works, we consider the area of their back grounds. I want to approach old works not as a condition of any history but as the old works themselves. The content of the following will be an analysis of the old work of Hong Gil Dong I examined it and then studied the structural contradictions reflected to it from a new perspective based on the theory of myth criticism.
曲管덕트 입구 영역에서 遷移定常流動의 速度分布와 壁面剪斷應力分布에 관한 연구
손현철,김명호,박길문 朝鮮大學校 機械技術硏究所 1998 機械技術硏究 Vol.1 No.1
In the present study, the flow characteristics of developing transitional steady flows in a square - sectional 180° curved duct are investigated experimentally. The experimental study for air flow in a square - sectional 180° curved duct is carried out to measure the axial velocity profiles and wall shear stress distributions by using Laser Doppler Velocimeter (LDV) system with data acquisition and processing the system of FIND software at 7 sections from the inlet (ø=0°) to the outlet (ø=180°) in 30° intervals of a curved duct. The results obtained from experimental studies are summarized as follows : (1) The critical Dean number of transitional steady flow is about 450. They show that critical Reynolds number in a curved duct is larger than that in a straight duct. (2) For transitional steady flows, the maximum velocity position of axial velocity profiles begins to incline toward the outer wall from ø=30°bended angle, velocity profiles in center of the duct have lower value than those of the inner and outer walls because of the centrifugal forces. (3) Wall shear stress distributions of transitional steady flows are increased at the entrance region because of increasing shear stress and pressure loss by the influence of flows.
곡관덕트에서 난류정상유동의 벽면전단응력분포와 입구길이에 관한 실험적 연구
손현철,이홍구,김대욱,김명호,박길문 朝鮮大學校 機械技術硏究所 2000 機械技術硏究 Vol.3 No.1
In this paper, an experimental investigation of characteristics of developing turbulent steady flows in a square-sectional 180°curved duct is presented. The experimental study using air in the square-sectional 180°curved duct is carried out to measure entrance length and wall shear stress distributions by using Laser Dopper Velocimeter(LDV) system with data acquisition and processing the system of FIND6260 software at 7 sections from the inlet(ø=0°) to the outlet(ø=180°)in 30°intervals of the curved duct. The results obtained from experimental studies are summarized as follows : (1) The critical Dean number of turbulent steady flow is about 560. (2) The value of the wall shear stress becomes minimum in the inner wall and gradually increases toward the outer wall where it becomes maximum. (3) The entrance length of the turbulent steady flow is shorter than that of the traditional steady flow, reaching the vicinity of bend angle 90°
마이크로 엔드밀을 이용한 Slot 가공에서의 공구변형에 의한 가공오차 보상
손종인,윤대진,윤길상,서태일 한국공작기계학회 2007 한국공작기계학회 추계학술대회논문집 Vol.2007 No.-
In this paper, we describe about machining error for tool deflection in slot-cutting processes using micro end-mill. In order to determine the compensated tool path, two machining error parameters are defined and modeled using the SEM images. Experiments are carried out to validate the approaches proposed in this paper. In result of, we decrease a machining error in slot-cutting processes for compensated tool path.
박길문,이행남,백대우,손현철 朝鮮大學校 機械技術硏究所 2000 機械技術硏究 Vol.3 No.1
In this study, Flow characteristics of turbulent unsteady flows in a square-sectional 180°curved duct were experimentally investigated. Experimental studies for air flow were conducted to measure pressure distributions in the square-sectional 180°curved duct by using a magnehelic differential pressure gage. The experiment were conducted in nineteen sections from the inlet (ø=0°) to the outlet(ø=180°) of the duct at 10°intervals. The results obtained from the experimentation are summarized as follows. (1) In the turbulent oscillatory flow, the pressure distribution was the largest in the accelerating and decelerating region of the bend angle of 90°and the pressure difference of the inner and outer walls was the largest before and after the bend angle of 90°. (2) In the turbulent pulsating flow, the pressure difference was the largest near the region of bend angle of 90°in the case of the middle region, and since then the pressure difference of the inner and outer walls became smaller.
기체 방사성 물질 제거를 위한 첨착 활성탄 필터 시스템 성능에 관한 연구
김대욱,손현철,이명석,이석범,박길문 朝鮮大學校 機械技術硏究所 1999 機械技術硏究 Vol.2 No.1
This paper presents an application of impregnated activated carbon and impregnated activated carbon filters. They are used for the removal of gaseous radioactive materials at radioactive material handling facilities such as nuclear power plants and research facilities. High adsorption efficiencies as well as stability are required for them to remove hazardous radioactive gases such as activated free iodine released during normal operation or accident condition. This research was initiated to enhance the independence of nuclear industry and raise the level of nuclear technology to that of the leading nuclear nations. By attaining the capability of design and development of HVAC system, national technological competitiveness can be achieved. Also, the ground for technology export will be hardened. Therefore, it is well timed to initiate the project to develope those filter systems domestically utilizing all the relevant technologies available.
김대욱,윤완중,손현철,박길문 朝鮮大學校 機械技術硏究所 2000 機械技術硏究 Vol.3 No.2
For manufacturing the small-type incinerator with collecting performance of high efficiency, the experimental study was carried out with considering cyclone characteristics, tangential velocity, radial velocity and pressure of the internal cyclone. The model cyclone consisted of slick acryl was made for similarity and data of tangential inflow velocity were acquired by using a vinyl particle as a working fluid. The results obtained from the experimentation are summarized as follows : 1. Tangential velocity of internal cyclone increases as the size of particle become bigger 2. Pressure is maximum value at the wall of cyclone and decreases toward the center of cyclone. 3. The difference of pressure between maximum and minimum value is increased as the size of particle become bigger.
남조류의 체외 대사부산물이 다른 조류의 광합성에 미치는 타감작용
김범철,허우명,황길순,안태석,심재형 江原大學校 附設 環境硏究所 1994 環境硏究 Vol.11 No.-
The effect of cyanobacterial extracellular byproducts upon the aIgal photosynthesis was assessed to elucidate the allelopathic effect of algal blooms in eutrophic lake. Algal cultures were filtered with 0.2μm membrane filters to remove algal cells and sterilized. 0 to 30m1aliquots of filtrate were added to 25m1 culture suspensions of other algal species, and the (14)^C uptake rates wert measured. The filtrates of cyanobacterial cultures(Anabaena flos-aquae, Phormidium sp.) inhibited the photosynthesis of green algae(Selenastrum capricornutum and Scenedesmus brasiliensis), while the filtrate of Selenastrum capricornutum and Scenedesmuns brasiliensis did not inhibit Anabaena flos-aqiae. In the autoinhibition test Anabaena flos-aquae, Selenastrum capricornutum, and Scenedesmus brasiliensis showed positive, negative, and no effects, respectively.
허우명,김범철,황길순,최광순,박원규 江原大學校 附設 環境硏究所 1996 環境硏究 Vol.13 No.-
The longitudinal variations of water quality along the mainstream of the Nak-ding River from May 1994 to October was surveyed by the measurement of chl-orophyll a, total phosphorus, total nitrogen, dissolved inorganic phosphorus, nitrate-nitrogen, ammonia-nitrogen concentration, and secchi disc transparancy. Chl. a, TP, TN, DIP, NO_(3) and NH_(3)-N concentration was maintained at high level during the investigation period. And they also showed the peak after the input of Kumho River. Chl. a concentration was increased from 14.2㎎/㎥ in May to 95.2 in October. TP ane TN concentration was maintained always above 100㎎/㎥ and 3~4㎎N/l, respectively. TN/TP ratio were less than 16 from June to September with a few exceptions. Therefore, nitrogen is the limit-ing nutrient in the Nakdong River. Trophic states were in the range of eutrophic to hypertrophic, from 60 to80.