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김익수,박동기,성일용,김승혁,엄제현 三陟大學校 2000 論文集 Vol.33 No.1
For the purpose of reserching the floatability of Managanese-nodule, the test was proformed by means of Zeta potential measuring and the flotation experiment for 10Å Manganite. The flotation condition in the flotation experiment were as follow. sample : Todorokite (0.3gr) sample size : 65 mesh ~ 200 mesh condition size : 10 min flotation time : 4 min air amount : 20 ㎖/min promoter : D.A.cl, S.D.S. PH regular : Hcl, CaO From the test the flotation result were summerized as follow. 1. The isoelectric point of 10Å Manganite in the Zeta potential measuring was pH 4.3. 2. The floatability of 10Å Manganite was 80% as a function of pH5 using 10mg/ℓ of D.A.cl. 3. The recovery of 10Å Manganite was best when the floatability of 10Å Manganite was 90% as using D.A.cl 80mg/ℓat PH 2.7.
김일수,김기우,정영재,손준식,송창재,박주석 한국공작기계학회 1999 한국생산제조학회지 Vol.8 No.6
This paper concentrates on the position control of a pneumatic cylinder under parameter variation. A closed-loop control is proposed to design the different controllers(P, PI, PID, PD controller) in order to choose the best controller based on the fast and accurate control of the system. It is shown that the control algorithm is robust and effective in attaining the fast and accurate position control of system under time-dependent parameter variation. Experimental results showed that PD controller law is effective to obtain the fast response and to increase the stability of the system. The method is a useful control algorithm which always automatically adjusts the position control in accordance with the error, using carrier wave of triangle type regardless of changes on the operating condition and physical differences between components.
전자동 자반건조기 제작에 이용할 Water Jet의 유동해석 모델
김일수,박창언,정영재,손준식,남기우 한국공작기계학회 1998 한국생산제조학회지 Vol.7 No.5
This paper concentrates on the development of a computational design program to determine nozzle size in water jet, combing the numerical optimization technique with the flow analysis code. To achieve the above objective, a two-dimensional model was developed for investigating the fluid flow in water jet and calculating the velocity and pressure distributions. The mathematical formulation as a standard R-ε model was solved employing a general thermofluid-mechanics computer program. PHOENICS code, which is based on the Semi-Implicit Method Pressure Linked Equations (SIMPLE) algorithm. The developed code was applied to water jet design to determine the nozzle size, and investigated the effect of the change of nozzle location. Calculated results showed that the flow pattern is not changed as the change of nozzle location.
核然料에 關한 硏究 : α-UO_3의 構造的 特性 Structural Characteristics of α-UO_3
李秀一,曺秉旭,洪光俊 조선대학교 기초과학연구소 1984 自然科學硏究 Vol.7 No.1
α-UO_3 have been prepared from uranyl acetate solution by the thermal decomposition method. The materials structure were examined by surface morpholgy, X-ray diffraction and optical density spectrum. The results showed that α-UO_3 exists two different crystalline forms depending on the temperature of precipitation ; hexagonl α-UO_3 at 350℃ and orthorhombic α-UO_3 at 600℃.
탄성 의치상 이장재의 캔디다 알비칸스 부착도에 관한 실험적 연구
하일수,조주온,이상돈,송광엽,박찬운 全北大學校 齒醫學硏究所 1992 전북치대논문집 Vol.10 No.1
The purpose of this study is to compare the response of four commercially available soft denture lining materials to the growth of C. albicans in vitro. Twelve samples of each soft lining materials were made to a uniform size and volume(15×5×4㎜) and sterilized using ethylene oxide. The samples were individually placed in culture tubes containing 5㎖ of sterile SDB(sabouraud dextrose broth dehydrated) and 0.1㎕ of activated C. albicans(ATCC 10231). The culture tubes had been incubated in incubator at 37℃. Three samples of each material had been tested at 3, 21, 35 and 56 days to determine the number of adherent cells of C. albicans on their surfaces and the number of nonadherent cells in the broth associated with each samples. The data have been analyzed by ANOVA and Scheffe test. The results have been obtained as follows : 1. In growth patterns of C. albicans within soft lining materials, Molloplast-B and K-33 were significantly higher(p<0.01) compared with Coe-Soft, but there was no significant difference between Coe-Soft, Coe Super-Soft and Mollosil(p>0.05). 2. Molloplast-B showed significantly higher(p<0.01) amounts of C. albicans adhering to its surface than other materials under experimental conditions. 3. Generally, adherence was significantly increased until 5 weeks, and after then showed decreased pattern in all materials(p<0.01). 4. The C. albicans was able to penetrate the inner portion of all samples. Coe-Soft showed most amounts of invaded C. albicans, followed in order by Mollosil, Molloplast-B, and Coe Super-Soft.
김수신,백세민,김동일 大韓成形外科學會 1987 Archives of Plastic Surgery Vol.14 No.1
Utilizing the lateral thigh flap as originally described by Se-Min Baek. in 1983, we have treated seven cases of reconstruction involving crushing injuries of the hand. This flap is derived from the third perforator of the deep femoral artery and accompanying wein as per Baek`s method. When a large skin flap was needed such as the case of crushing hand injuries, a lateral thigh flap was more useful than any other flap. From our experiences for reconstruction of crushing hand injuries, the following advantages of this flap are noted: 1. It is possible to obtain a large size of all skin flap. 2. It is relatively thin with a small amount of the subcutaneous fat. 3. The vascular pedicle is long (10㎝ or more), facilitating microvascular anastomosis. 4. The lateral thigh flap can be a sensory flap. 5. It can be accommodated easily to any operating position.
GMA 용접의 윗면 비드폭 선정을 위한 최적 공정변수들
김일수,Prasad,전광석 한국공작기계학회 2002 한국생산제조학회지 Vol.11 No.4
This paper aims to develop an intelligent model for predicting top-bead width for the robotic GMA(Gas Metal Arc) welding process using BP(Back-propagation) neural network and multiple regression analysis. Firstly, based on experimental data, the basic factor affecting top-bead width are identified. Then, BP neural network model and multiple regression models of top-bead width are established. The modeling methods and procedure are explained. The developed models are then verified by data obtained from the additional experiment, and the predictive behaviors of the two kind of models are compared and analysed. Finally the modeling methods, predictive behaviors and the advantages of each models are discussed.