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운동에너지 탄에 따른 전투시스템 내의 순간화재발생에 대한 해석적 연구
이승철(Lee Seung-Chul),전우철(Jeon Woo-Chul),이해평(Lee Hae-Pyeong),이헌주(Lee Heon-Joo),이창현(Lee Chang-Hyun) 제어로봇시스템학회 2012 제어로봇시스템학회 합동학술대회 논문집 Vol.2012 No.7
본 연구는 외부 위협탄에 의한 전투시스템의 취약성을 분석하기 위한 선행연구로써, 운동에너지 탄의 종류에 따른 가상의 전투차량 내부에 적재포탄에서 순간화재발생 여부에 대한 전산해석을 수행하였다. 본 해석은 Autodyn 프로그램을 사용하였으며 순간화재발생을 판단하기 위해 Lee-Tarver ignition and growth model을 이용하였다. 본 계산에서 운동에너지 탄은 type A와 type B 두 가지로 설정하였고, 고폭탄은 COMPB, TNT 및 PBX9404를 설정하였다. 전산해석 결과, 고폭탄의 재질이 TNT와 PBX9404가 COMPB 재질보다 순간화재발생 확률이 상당히 높음을 알 수 있고 type B의 운동에너지 탄이 type A 보다 순간화재발생 확률이 다소 높음을 알 수 있었다.
AlTiN코팅공구를 사용한 플라스틱금형강의 기계가공성 평가
이승철,조규재,Lee, Seung-Chul,Cho, Gyu-Jae 한국생산제조학회 2009 한국생산제조학회지 Vol.25 No.2
In this research, KP-4, one of the plastic mold steels, was coated with the AlTiN from one layer to four layers by the PVD method in the $\Phi$ 8mm cemented carbide ball end mill. Coated KP-4 was processed with various conditions. For example, slope of $15^{\circ}$, $30^{\circ}$ and $45^{\circ}$ the spindle rotation speed was changed from 10,000rpm to 16,000rpm, the tool feeding speed was changed from 1,300mm/min to 1,700mm/min, the depth of cut was also changed from 0.3mm to 0.9mm, and etc. Cutting component force according to the coating layer number, and surface roughness were studied. The cutting component force showed a good agreement better the up ward direction than the down ward direction under all experimental conditions. In case of the condition per the material shape, it was lessen when the tool have larger angle because the average effective diameter of the tool is larger. The surface roughness showed good condition in case of the up ward than the down ward direction. And, in the 3rd layer of AlTiN coating, it showed the most suitable condition.
태양광-풍력 복합발전시스템의 경제적 운용을 위한 최적 용량 산정에 관한 연구
이승철,문운철,권병국,김종환,Lee, Seung-Chul,Moon, Un-Chul,Kwon, Byeong-Gook,Kim, Jong-Hwan 한국조명전기설비학회 2004 조명·전기설비학회논문지 Vol.18 No.3
본 논문에서는 누진전력요금제도 하에서 주어진 부하에 대해 최적의 계통연계형 태양광-풍력 복합발전시스템 용량을 산정하는 기법에 대하여 논한다 일사량 및 풍속의 확률밀도함수를 이용해 복합발전시스템 발전량의 기대치를 구하고, 총수명가 분석법에 기초하여 월별 발전단가를 산정하는 기법과 함께 월사용전력량이 증가함에 따라 전력요금이 급속히 증가하는 누진전력요금구조 하에서 전체 월 전력비용을 최소로 하기 위한 설비용량산정기법에 대하여 논한다. 제안한 기법의 적용가능성을 검토하기 위하여 실제 수도권의 기상데이터를 근거로 하여 본 대학에 설치된 prototype 복합발전시스템을 이용하여 실증연구를 수행하였다. In this paper, a technique that estimate the optimal capacity of the solar-wind hybrid power system for minimizing the total monthly electric power expenses is presented. The hybrid power system is assumed to be operated in connection with the utility power system and electric bill be paid for the power not covered by the hybrid system generation. Monthly generation cost is estimated based on total life-cycle cost analysis. The monthly utility power bill is assumed to be increased quadratically in proportion with the net utility power consumption which is the difference between the total monthly load minus the hybrid system generations. Test results demonstrate applications potential of the proposed technique.
이승철,조수헌,안형식,윤덕로,Lee, Seung-Chul,Cho, Soo-Hun,Ahn, Hyeong-Sik,Yun, Dork-Ro 대한예방의학회 1989 Journal of Preventive Medicine and Public Health Vol.22 No.1
The adverse effect of diving on the fetus may extend beyond n gestational process and outcome. Primiparous Sprague-Dawley rats were assigned to one of ten exposure schedules during gestatred $PO_2$ level, the following question about the effect of exposing a pregnant female to high partial pressure of inspired oxygen has been raised. 'What effect does an increased maternal $PIO_2$ have on fetal arterial $PO_2$ and therefore on possible fetal oxygen poisoning?' This study was carried out to observe the effects of maternal hyperoxia on gestational process and outcome. Primiparous Sprague-Dawley rats were assigned to one of ten exposure schedules during gestation. The treatment groups were subjected to either the high concentration of oxygen, or the high atmospheric pressure. On day 21 of gestation, laparotomy was performed to examine for number and distribution of implantations and live and resorbing embryos. Fetuses were weighed, and examined for gross malformations. Subsequently, they were fixed, measured in physical parameters, and examined for visceral anomalies. Minor visceral anomalies and anatomical variation was not found. Similarily, there were no significant differences when number of resorptions, mean fetal weights, pregnancy interruption rate were compared by analysis of variance. These results indicate that exposing rats to oxygen at increased atmospheric pressure doese not affect fetal health or survival.
긴장재배치에 따른 PT 이방향 슬래브의 거동에 대한 해석적 연구
이승철,이영학,Lee. Seung-Chul,Lee. Young-Hak 한국방재학회 2011 한국방재학회논문집 Vol.11 No.6
본 논문에서는 이방향 포스트텐션 슬래브의 다양한 텐던의 배치에 따른 효과를 분석하기 위해서 유한요소법에 기반한 해석적 연구를 수행하였다. 등분포된 텐던의 배치에서부터 기둥의 중심선에 인접하게 배치되는 형태까지 연구범위를 설정하였고, 유한요소해석 상용 프로그램인 SAP에서 제공하는 휨-평면 요소를 사용하여 모델링을 하였다. 텐던 프로파일에 근거한 등가하중을 텐던 배치에 따라서 적용하였으며, 사용 하중 상태에서의 처짐과 순수 모멘트를 결정하기 위해 텐던에 대한 등가하중에 일반적인 중력하중이 부가되었다. 또한 해석 결과와 실험결과를 비교 분석하였다. In this paper, the FE analysis results are presented to evaluate the effects of various tendon layouts on the performance of post-tensioned concrete two-way slab systems. Various arrangements from uniform cable layouts to closely banded arrangements adjacent to column centerlines are considered. The slab is modeled using plate-bending elements in the software package SAP. Equivalent loads based on cable profiles are applied to the slab according to the tendon layout. Moment fields and deflected shapes are compared for the various tendon patterns. Gravity loads are applied in the usual way and superimposed on the results from the equivalent tendon loads to determine net moments and deflections at service load levels. In addition to a study of tendon layouts, the finite-element model is compared with experimental results.
인공신경망을 이용한 VVVF-유도전동기 시스템의 실시간 운전효율 최적제어
이승철,최익,권순학,최주엽,송중호,Lee, Seung-Chul,Choy, Ick,Kwon, Soon-Hak,Choi, Ju-Yeop,Song, Joong-Ho 전력전자학회 1999 전력전자학회 논문지 Vol.4 No.2
최적효율제어를 통한 유도전동기의 효율향상은 에너지 절감측면에서 매우 중요하며 인공신경망을 사용하면 시스템의 특성이 충분히 해석되지 않은 상태에서도 우수한 제어특성을 얻을 수 있다. 본 논문은 유도전동기 구동시스템에서 최적 슬립주파수를 추종하는 실시간 인공신경망 회로를 구성하여 운전효율을 최적화하는 제어방법을 제안한다. 제안된 최적 효율제어기는 인공신경망 제어기에 의해 시스템의 비선형성을 포함하여 전동기의 내부손실이 최소가 되는 운전점을 추종한다. 시뮬레이션과 실험을 통하여 기존의 일정v/f 방식에 비하여 고속 경부하시 경제성 있는 에너지 절감효과를 충분히 확보할 수 있었다. On-line efficiency optimization control of an induction motor drive using neural network is important from the v viewpoints of energy saving and controlling a nonlinear system whose charact81istics are not fully known. This paper p presents a neural networklongleftarrowbased on-line efficiency optimization control for an induction motor drive, which adopts an optimal slip an밍J.lar frequency control. In the proposed scheme, a neuro-controller provides minimal loss operating point i in the whole range of the measured input power. Both simulation and experimental results show that a considerable e energy saving is achieved compared with the conventional constant vlf ratio operation.
운동에너지 탄과 적재포탄에 따른 전투시스템 내부에서의 순간화재발생에 대한 전산해석
이승철,전우철,이해평,이헌주,Lee, Seung-Chul,Jeon, Woo-Chul,Lee, Hae-Pyeong,Lee, Heon-Joo 한국군사과학기술학회 2013 한국군사과학기술학회지 Vol.16 No.6
In this paper, numerical analysis was performed about whether the flash fire of loaded shells breaks out in the virtual combat vehicle according to sorts of the kinetic energy ammunition as the preceding research for vulnerability analysis inside the combat system by an external threaty ammunition. In this simulation, Autodyn program was used and the Lee-Tarver ignition and growth model was used to determine the flash fire outbreak. In this study, the kinetic energy ammunition was set of type A and type B in two kinds and the loaded shells was set of COMPB, TNT, PBX9404 and ANB. As a result, TNT and PBX9404 have much higher flash fire probability than COMPB in high explosive, ANB has very low flash fire probability.
이승철,류명현,한철수,반유선,Lee, Seung-Chul,Ryu, Myung-Hyun,Han, Chul-Soo,Ban, Yu-Son 한국작물학회 1988 Korean journal of crop science Vol.33 No.S
This paper comprised a review of published literature dealing with the evaluation of tobacco quality and usability. Evaluation of tobacco quality and usability seems to be difficult not only due to our inability to define them in simple and easily measurable term but also due to their relations to the profitability of tobacco companies and safety of comsumers. Chemical constituents and smoking taste and aroma of the tobacco represent the underlying basis for tobacco quality: however, tobacco is still purchased upon its physical appearance. Grade and value system is very convenient for evaluating the tobacco quality, if the system is based on the triangular relationship of physical appearance, chemical and smoking properties of tobacco, and also based on intrinsic quality of the tobacco independent of external influences. Grade and value system for tobacco in Korea is thought to be influenced by external factors besides intrinsic quality. Therefore, we have to concern new systems that could be supplement to, or replacement for currently available grade and value system.