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발포 벽지 공정에서 이기종 PLC 그룹 관리를 위한 네트워크 운영과 해석
강성덕(Kang Sung Duk),이동춘(Lee Dong Choon),김정호(Kim Jeong Ho),이상범(Rhee Sang Burm) 한국정보처리학회 1996 정보처리학회논문지 Vol.3 No.2
To operate the automatic devices of manufacturing process more effectively and to solve the needs of the resource sharing, network technology is applied to the unit control devices located in common manufacturing zone and operated by connecting them. This paper introduces a design and test operation of cell system for the management of multivendor PLC by applying to wall paper process based on the manufacturing standardization of CIM. The analysis of designed multivendor PLC group is performed by selecting the parameters such as variation of data packet size and node number of PLC ladder logic program and variation by analyzing the corresponding variation values of token rotation time and waiting time for the system operation. For the method of the analysis. The equation is derived considering the overhead such as indicated packet service time and transmission safety margin for PLC network connection in M/G/I queue model, and it is applied to the cell system and PLC group management for operation. Through the experiment, it is found that the realtime processing is possible with expanded and better result than the result obtained by Jayasumana, Browaka with PLC scan time considered, response lower limit of 10~20 msec. data packet size not more than 50 byte, and the number of node less than 40.
강성덕(Kang Seong-Deok),박상준(Park Sang-Jun),김상대(Kim Sang-Dae) 대한건축학회 2007 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.27 No.1
This paper presents a study of the elastic local buckling in steel H-columns at elevated temperatures. A computer program of buckling analysis is developed in order to model the properties of the steel H-column section at elevated temperatures, failure temperatures can be proposed. The buckling temperature is predicted for different boundary conditions. Degradation of steel properties with increasing temperature was assumed in accordance with EC3 Part1.2 recommendations. The factors under investigation include material property, local buckling coefficient and slenderness ratios of the flange and web. A method is proposed to deal with this change and a design example is given to demonstrate how to use the proposed method.
강성덕(Kang Seong-Deok),남상철(Nam Sang-Chul),김인기(Kim In-Ki),민병직(Min Byung-Jik) 대한건축학회 2009 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.29 No.1(구조계)
This paper is on the Mid-span deflection and the failure temperature of H-beams in fire that investigated mainly on the parameters of load ratios and simply supported boundary condition in considering the behaviour of steel beams at predicted uniformly elevated temperatures. The physical properties of steel material at elevated temperatures are according to EC3 Part 1.2 and the strength of the steel beams in fire show that they are governed by the ratios of lateral length to the radius of gyration about minor axis.
유기폐수처리를 위한 Rhodospirillum rubrum P17 의 종균생산
조경덕(Kyung Dug Cho),강성옥(Seong Og Kang),임왕진(Wang Jin Lim),조홍연(Hong Yon Cho),양한철(Han Chul Yang) 한국응용생명화학회 1993 Applied Biological Chemistry (Appl Biol Chem) Vol.36 No.6
A photosynthetic bacterium strain P17 having high growth rate and assimilating ability of organic acids was isolated from several soil samples, which was identified as Rhodospirillum rubrum. Cultural conditions of the strain P17 were examined for the production of starter culture used in the treatment of organic waste water. The addition of organic acids mixture as carbon source containing 0.2% Na-acetate, 0.1% Na-propionate and 0.2%r Na-lactate and 0.1% of yeast extract as growth factor stimulated the cell growth. The maximal cell production was obtained at 30℃, pH 7.0, 2,500 lux of illumination and 50∼100 rpm of agitation. Under the optimal conditions of batch and fed-batch culture systems in a Jar fermentor, 5.17 g/ℓ and 7.93 g/ℓ of cells were obtained after 5 days of cultivation, respectively. In continuous culture system, the cell productivity was 0.206 g/ℓ/h at a dilution rate of 0.21 h^(-1). When R. rubrum P17 was cultivated in a soybean curd waste water, initial COD level(3,240 ㎎/ℓ) of the waste water was reduced to 250 ㎎/ℓ after 4 days of cultivation.
강성덕,김재억,최현식,Kang, Seong-Deok,Kim, Jae-Uk,Choi, Hyun-Sik Korean Association for Spatial Structures 2012 한국공간구조논문집 Vol.5 No.4
본 연구는 온도 증가에 따른 압축을 받는 H형 강재의 플랜지와 웨브의 국부 및 전체좌굴응력 내화해석 프로그램 개발과 플랜지와 웨브가 항복파괴전에 국부좌굴이 일어나지 않을 한계 판폭두께비의 상관값을 구하는 프로그램을 개발하는 것이다. 고온에서의 강재의 응력-변형도 관계식은 EC3:Part 1.2를 근거로 하였으며, 비교, 검토를 위하여 영국 BS5950의 강재를 대상으로 온도 증가에 따른 압축을 받는 강재의 플랜지와 웨브의 파괴온도와 하중을 본 연구의 내화해석 프로그램으로 예측하였다. 본 연구는 좌굴 및 항복에 대한 내화해석 프로그램을 개발하는 것을 목적으로 하고 적용 예를 통하여 좌굴 및 한계 판폭두께비를 분석하고 개발 프로그램의 타당성을 검토하였다.