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김기철,김재남,박세열,윤의박 대한금속재료학회(대한금속학회) 1984 대한금속·재료학회지 Vol.22 No.3
In determining non-metallic inclusion rating in steel, the efficiency and reliability of conventional manual method and computer aided automatic method using image analyzer have been investigated. To see the effect of shape change of the inclusions on the cleanliness value based on existing test standards, the test coupons examined were taken from continuously casted slab, hot rolled plate and from cold rolled sheet where some inclusions were extremely elongated. Results show that the cleanliness values determined by two methods agree fairly well for both samples with globular oxide inclusions and with properly elongated inclusions. For samples with extremely elongated inclusions, however, the cleanliness value processed by image analyzer tends to be smaller than that of manual count. It appears that the automatic method gives faster and more reliable cleanliness value since the image analyzer determines the value in area fraction instead of in point fraction.
미생물 Inulase 에 의한 돼지감자 중의 Inulin 분해에 관한 연구
김기철 한국농화학회 1975 Applied Biological Chemistry (Appl Biol Chem) Vol.18 No.3
The analysis of Jerusalem artichoke showed that it contains 12.09% of Inulin. The results obtained from the examination of the conditions for fructose production by cultivating Pencillum sp 1 in the Jerusalem articoke medium were as follows: 1. The optimum amount of water added to Jerusalem artichoke was 2.5 L of distilled water per ㎏ of fresh Jerusalem artichoke. It this case, the concentration of Inulin was 4% (w/v). 2. The optimum temperature was 30℃, the initial optimum pH was 5.0 and the optimum cultural period was 72 hours. 3. Shaking culture with 50 ㎖ of the medium and 120 oscills/min in 500 ㎖ shaking flask was most effective as the culture method. 4. 0.1% of NH₄H₂PO₄ as a nitrogen source, 0.001 of FeSO₄7H₂O and 0.001 of MgSO₄7H₂ as metal salts were most effective. 5. Fructose production continued to increase for 72 hours under the optimum conditions for cultivation and the highest production rate to the Inulin was 95.25%.
김기철,윤의박 대한금속재료학회(대한금속학회) 1995 대한금속·재료학회지 Vol.33 No.3
With high power carbon dioxide laser system, C-Mn structural steel for automobile application was welded. Bead-on-plated welding process was applied with 6㎜ thick hot rolled steel plates, and the welding conditions such as travel speed, position of focus and laser output power were 1.2m/min, l.0㎜ under the sample surface and 2.1㎾, respectively. Microstructural examinations and calculation indicated that the microstructrue of the laser weld, which experienced very high heating and cooling cycle during welding process, may not be predicted from the founds in the conventional arc process. Test results also demonstrated tha the austenite nucleation takes place at the pearlite-ferrite boundaries instead of the interface between ferrite and cementite in the pearlite. In the laser welding, the initiation and completion temperature of austenite transformation are much higher than that in the arc welding. Hardness of martensite in the HAZ varies from 635 Hv to 350 Hv because the homogenization of austenite is not complete even at the temperatures far above the A₃.
金起撤 서울시립대학교 산업기술연구소 1997 산업기술연구소논문집 Vol.5 No.-
This paper proposes a new memory system called shuffle memory. The shuffle memory is an extension of transposition memory which has been widely used in 2-dimensional Discrete Cosine Transform and Discrete Fourier Transform. The shuffle memory receives MxN 2-D input array in row major order and provides MxN output array in column major order. The shuffle memory provides "read-then-write at the same address operation". In other words, an input array element is written at the same address an output element has been read. The shuffle memory is the first memory system that receives MxN inputs in row major order and provides MxN outputs in column order with the minimum amount of memory space.
김기철,이기호,윤의박 대한금속재료학회(대한금속학회) 1990 대한금속·재료학회지 Vol.28 No.8
Spot, weldability of the galvanized steel, galvanneld steel and cold rolled steel is compared exclusively in this study. In order to investigate the effects of welding parameters on the weld strength of each steel, welding current and welding time were systematically varied under a constant pressure. Spot weldability of surface coated steels was strongly dependent upon types of coating although the compositions of coating (Zn-Fe) and base plate were almost identical. As the welding heat input (current and time) increased, nugget size and strength increased. However, when heat input (especially current) was greater than a critical value, effects of energy input became minor. Results also demonstrate that the tensile shear strength can be expressed by a second order equation of welding current and welding time. Experimental data fall within 5% error limit of the calculated values.
콘크리트와 강제데크의 합성 바닥판의 실용적인 진동해석 방법
김기철 한국공간구조학회 2005 한국공간구조학회지 Vol.5 No.4
데크플레이트와 콘크리트가 합성되어 있는 합성 바닥판 구조물은 데크플레이트의 골 방향과 골 직각방향에 대하여 강성이 다르므로 직교이방성판 거동을 보이고 있으며 테크플레이트와 콘크리트의 합성 거동으로 인하여 적층 바닥판 구조물로 평가할 수 있다. 이러한 합성데크 바닥판 구조물의 진동에 대한 정확한 사용성 평가를 위해서는 합성데크 바닥판 구조물의 정밀 진동해석을 수행하여야 한다. 이를 위해서는 합성데크 바닥판 구조물의 강성에 대한 직교이방성 그리고 데크플레이트와 콘크리트의 합성에 대한 정확한 거동 평가가 수반되어야 한다. 본 논문에서는 합성데크 바닥판 구조물의 골 직각 방향에 대한 강성을 계산하기 위하여 각각의 토핑 콘크리트 두께와 데크플레이트 두께를 적용하였다. 또한 골 방향에 대한 강성을 계산하기 위하여 콘크리트와 데크플레이트의 단면 강성을 구하여 등가두께를 적용하였다. 그리고 콘크리트와 데크플레이트의 합성거동을 표현하기 위하여 적층판에 대한 등가 강성식을 적용, 합성데크 바닥판 구조물의 강성을 나타내었다. 본 논문에서 제안한 합성데크 바닥판 구조물의 실용적인 모형화방법을 적용할 경우에 합성데크 바닥판 구조물의 강성에 대한 직교이방성과 콘크리트와 데크플레이트의 합성 거동을 잘 표현할 수 있었다. Composite slab structures consisted with steel deck plate and concrete material show generally anisotropic structural behavior because of different stiffness between the major direction and sub-direction of deck plate, and also the structures can be regarded as the laminated slab structures. It is necessary for the composite deck slab structures to carry out the exact vibration analysis to evaluate the serviceability. Also, it is needed to evaluate the exact structural behavior of composite deck slab with a layered orthotropic materials. In this paper, the thickness of topping concrete and deck plate are used to calculate the material coefficient stiffness of a sub-direction, and an equivalent depth calculated from sectional stiffness of concrete and deck plate is applied to get the stiffness of a major direction. The stiffness of two layered composite plates with different depth is determined by laminated theory. It is concluded that the presented method can efficiently analyze the structural behavior of composite deck slab consisted with steel deck plate and concrete material in the practical engineering field.