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공리적 설계를 적용한 심해저 망간단괴 집광시스템의 설계평가
최종수,홍섭,김형우,여태경,이태희,Choi, Jong-Su,Hong, Sup,Kim, Hyung-Woo,Yeu, Tae-Kyung,Lee, Tae-Hee 한국해양학회 2008 바다 Vol.13 No.3
The conceptual design evaluation of Deep-Sea Manganese Nodule Miner(DSNM) based on Axiomatic Design was preformed. Functional Requirements(FRs) in functional domain and Design Parameters(DPs) in physical domain were embodied for the given concept design of DSNM. Interactions between FRs and DPs were sequentially analyzed from the first level hierarchy to the lower level hierarchy. The interactions were expressed as design matrices which showed the dependence or independence between FRs and DPs. The results showed that the design of DSNM was not a coupled one, but a decoupled. Finally, it was conceptually verified that DSNM was a good design satisfying the independence axiom of the Axiomatic Design. 심해저 망간단괴 집광시스템(이하, 집광시스템)의 개념설계가 공리적 설계(Axiomatic Design)의 관점에서 평가되었다. 또한 이미 수행된 집광시스템의 개념설계에 대해 기능적 영역의 기능요구와 물리적 영역의 설계파라미터가 구체화되었다. 기능요구와 설계파라미터의 상호관계는 첫 번째 수준 계층에서 하위 수준 계층으로 순차적으로 분석되었다. 이러한 상호관계는 설계행렬의 형태로 표현되었고 기능요구와 설계파라미터 사이의 독립성을 판단하기 위한 지표로 사용되었다. 설계행렬의 분석결과 본 집광시스템은 설계파라미터간에 연성이 되지 않는 비연성화된 설계임이 확인되었다. 결과적으로, 본 집광시스템은 독립공리(Independence Axiom)를 만족하는 잘된 설계임이 개념적으로 입증되었다.
심해저 망간단괴 집광시스템의 물제트부양장치에 대한 FMEA 적용 연구
최종수(Jong-Su Choi),홍섭(Sup Hong),이태희(Tae Hee Lee),김형우(Hyung-Woo Kim),여태경(Tae-Kyeong Yeu) 한국해양공학회 2009 韓國海洋工學會誌 Vol.23 No.6
An FMEA for the water jet-lifter of a DSNM is performed to prevent the occurrence of device failure. A waterjet-lifter raises and transports manganese nodules from the deep-sea floor up to a somewhat elevated place, from which a pin-scraper transports the lifted nodules to the inner space of the DSNM A concept design for a device using the axiomatic design methodology is shown as the mapping between the functional domain and physical domain. The FMEA for a DSNM is introduced briefly and the rating criteria of severity, occurrence, and detection for the DSNM are defined. The FMEA of the functional requirements of a DSNM device is accomplished. Three kinds of failure modes, as well as their effects and causes, are predicted. Current design control methods for detecting potential failures, such as physical or computational experiments, design confirmation, and mathematical calculation, are described and the recommended actions for several significant causes are suggested.
최종수(Jong-Su Choi),한운기(Woon-Ki Han),안재민(Jae-Min Ahn),김재철(Jae-Chul Kim) 대한전기학회 2009 대한전기학회 학술대회 논문집 Vol.2009 No.10
In this paper, We researched a site on the actual condition and maintenance guide of solar power system In a inspection statistical chart, Recently Solar power system is increasing and planing to add it and 169 up to 2008 year march. For making a secure about a electricla safety, We know that it should be inspected a solra power system by the kesco guide and rule
심해저 연약지반 무한궤도 주행장치의 크리깅 근사모델 기반 강건설계
최종수(Jong-Su Choi),정재준(Jae-Jun Jung),김형우(Hyung-Woo Kim),이태희(Tae Hee Lee),홍섭(Sup Hong),여태경(Tae-Kyung Yeu) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
The tracked vehicle of deep-sea manganese nodules miner travels on very cohesive soft soil of deep-sea floor. The performance of the tracked vehicle depends on both designation of control factors, namely design variables, and influence strength of uncontrollable noise factors, namely design parameters. In this paper, robust design methodology is applied to the design of the tracked vehicle in order to minimize the variability, or, variance of system performance from noise factors. The environmental and operational conditions such as shear strength of soil and vehicle travel speed are selected as noise factors in this study. The width of track, contract length and weight and position of C.O.G. for vehicle and buoyancy module are chosen as control factors. The sinkage, slip, pitch angle and torque are determined as system performance. The system performances are obtained using the single body vehicle dynamic simulation program, TRACSIM. Screening using L27 orthogonal array for control factors and noise factors is performed to minimize the number of control factors and noise factors. The kriging approximation model is performed in order to get effectively the response value for a design set using DACE (Design and Analysis of Computer Experiments) and MES (Maximum Entropy Sampling). Objective function is defined as the weighted summation for 4 kinds of mean and variance of system performance. Constraints are defined as 4 kinds of inequality constraints for summation of mean and variance of each system performance. Mean and variance are directly calculated from the kriging approximation model based on assumption on gaussian distribution of noise factors. Robust optimal solution is obtained by using nonlinear constrained algorithm. The robust solution is compared with classical optimization one.
초경절삭공구의 CVD Diamond 코팅층 형성에 관한 연구
최종수(Jong-Su Choi) 산업기술교육훈련학회 2011 산업기술연구논문지 (JITR) Vol.16 No.2
CVD diamond films was deposited on hard tool substrate by MPECVD(Microwave Plasma Enhanced Chemical Vapor Deposition) System. Etchingwith diluted HNO3 and Murakami s reagent were used as substrate pretreatment. CVD diamond thin films were deposied by normal and cyclic process, which can be carried out periodically on and off the methane and oxygen gas flow in the H2-CH4-O2 system. Crystal structures for grown films, such as microcrystalline and surface morphology are characterized in term of growth condition by SEM, micro raman spectroscopy and AFM respectively. The Raman spectra of the nano particle consist mainly of two clearly distinct peak near 1140 and 1332cm-1. The Ra surface roughness of the films was observed at below approximately 200nm. The best conditions of CVD coating for hard insert tool are microwavepower 1000W, pressure 30torr, CH4/H2 rate 2% and deposition time 4hr. Also, CVD diamond coating has carried out on the surface of hard-metal inserts turning tool using microwave plasma CVD device. Through the pre-treatment process in coating and the gas flow control it forms optimal diamond coating layer condition on insert tool surface.
최종수(Jong-Su Choi) 산업기술교육훈련학회 2010 산업기술연구논문지 (JITR) Vol.15 No.3
JLF-1 steel (Fe-9Cr-2W-V-Ta), low activation ferritic steel is one of the promising candidate materials for fusion reactor applications. High temperature fatigue life and tensile strength of JLF-1 steel and its TIG welded joints were investigated at the room temperature and 400℃. The strength of base metal (JLF-1) is in between those of weld metal and the HAZ. When the test temperature was increased from room temperature to 400℃ both strength and ductility decreased for base metal, weld metal and the HAZ. The longitudinal specimens of base metal showed similar strength and ductility compared with those of the transverse specimens at room temperature and 400℃. Little anisotropy was observed in the JLF-1 steel base metal in terms of rolling direction. Fatigue limit of weld metal which was obtained from cross-weld specimen is 495MPa. Thus, the weld metal showed the higher fatigue limit than those of base metal at both room temperature and 400℃. Little anisotropy of fatigue properties was observed for JLF-1 base metal in terms of rolling direction. When the test temperature was increased from room temperature to 400℃, the fatigue limit of both base metal and weld metal decreased substantially.
직교배열표 실험계획법에 의한 심해저 점착성 연약지반용 무한궤도차량의 선회성능에 대한 실험 연구
최종수(JONG-SU CHOI),홍섭(SUP HONG),김형우(HYUNG-WOO KIM) 한국해양공학회 2006 韓國海洋工學會誌 Vol.20 No.4
This paper is concerned with experimental investigation of steering performance of a tracked vehicle on extremely soft soil. A tracked vehicle model with principal dimensions of 0.9 m(L)× 0.75 m(B)×0.4 m(H) and weight of 167 kg was constructed with a pair of driving chain links, driven by two AC-servo motors. The tracks were configured with detachable grousers with variable span. A deep seabed was simulated by means of a bentonite-water mixture in a soil bin of 6.0 m(L)× 3.7 m(B)× 0.7 m(H). The turning radii of vehicle and driving torques of motors were measured with respect to experiment variables: steering ratio, driving speed, grouser chevron angle, grouser span, and grouser height. L8 orthogonal table is adopted for DOE (Design of experiment). The effects of experiment variables on steering performance are evaluated.