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마이크로 크랙을 포함한 재료의 매크로 탄성 정수에 관한 자연요소해석
강성수,Kang, Sung-Soo 한국마린엔지니어링학회 2006 한국마린엔지니어링학회지 Vol.30 No.6
A meso-scale analysis method using the natural element method is proposed for the analysis of material damage of brittle microcracking solids. The microcracking is assumed to occur along Voronoi edges in the Voronoi diagram generated using the nodal points as the generators. The mechanical effect of microcracks is considered by controlling the material constants in the neighborhood of the micorcracks. The macro elastic moduli of isotropic solids containing a number of randomly distributed microcracks are calculated considering the effect of microcrack closure to demonstrate the validity of the proposed method.
강성수,Kang, Sung-Soo 한국시뮬레이션학회 2015 한국시뮬레이션학회 논문지 Vol.24 No.3
본 연구에서는 복합굴절차의 강도 해석을 통한 구조적 안정성을 평가하고자 한다. 3D CAD 데이터, 사용 재질에 대한 물성값, 하중 조건 및 경계조건을 바탕으로, 범용 구조 해석 프로그램인 Nastran을 활용하여 복합굴절차에 대한 정적 구조 해석을 실시하였다. 하부 프레임(Sub frame, Out-trigger, Chassis frame)에 대한 구조해석을 수행하기 위해, 각 Out-trigger가 최대 하중을 받는 4가지 경우를 산정하였다. 이러한 해석된 결과를 통하여 국부적으로 강도가 부족한 위치를 특정지어, 보다 안전한 설계에 도움이 되도록 하였다. This research focuses on structural stability of the multi-aerial platform. In this study, we conduct structural analysis for the lower structures such as sub frame, out-trigger and chassis frame, by using a universal structural analysis program NASTRAN based on 3D CAD data, material properties, load conditions and boundary conditions. We confirm the position of local stress exceeding the yield strength, through structural analysis of 4 cases for load conditions. As the results, it is possible to relax stress concentration in a way such as changing the thickness, reinforcing the material of the lower frames.
강성수,조성근,Kang, Sung-Soo,Cho, Seong-Keun 한국생산제조학회 2010 한국생산제조학회지 Vol.25 No.6
To achieve the structural safety of the vehicle, designs in various cases are carried out by using CATIA program. It is promoted the relaxation of stresses by collisions from the front portion, the side part and the rear portion of the vehicle. In this study, we conduct a variety of design of frames for the light weight frame of the vehicle and structural analysis, to protect the driver by adding reinforced frame. In the case of such a collision, there are maximum stresses greater than yield strength of steel and a very large local plastic deformation at the collision part.
강성수,Kang, Sung-Soo 한국마린엔지니어링학회 2006 한국마린엔지니어링학회지 Vol.30 No.6
Fracture behavior of brittle solids is closely related to microcracking. A meso-scale analysis method using the natural element method is proposed for the analysis of brittle microcracking solids. The microcracking is assumed to occur along Voronoi edges in the Voronoi diagram generated using the nodal points as the generators. The mechanical effect of microcracks is considered by controlling the material constants in the neighborhood of the microcracks. The meso-analysis method is applied to the simulation of the microcracking behaviors of brittle solids subjected to tensile macrostress. The method is also applied to the analysis of the propagation of a macrocrack accompanied by the coalescence with microcracks formed near the macrocrack-tip.
BK곱과 COLREGs에 기반한 지능형 선박의 충돌회피시스템
강성수,이영일,정희,김용기,Kang, Sung-Soo,Lee, Young-Il,Jung, Hee,Kim, Yong-Gi 한국정보통신학회 2007 한국정보통신학회논문지 Vol.11 No.1
본 논문에서는 지능형 선박의 실시간 장애물회피를 위한 충돌회피시스템을 논한다. 다른 무인자율항체들의 충돌회피시스템과는 달리 지능형 선박의 충돌회피시스템은 목적지까지의 합리적이고 안전한 경로를 통한 충돌회피뿐만 아니라 해양을 항해하는 모든 선박이 준수해야하는 국제해상충돌예방규칙(COLRECs, International Regulations for Preventing Collisions at Sea)을 반영해야한다. 목적지까지의 합리적이고 안전한 경로를 통한 충돌회피라는 일반적인 충돌회피시스템의 목표를 달성하기 위해 BK-곱에 기반한 휴리스틱 탐색기법을 채용하며, 또 다른 목표인 COLREGs의 준수를 위해 충돌회피를 위한 규칙을 적용하는 지식기반시스템을 채용한다. 제안된 충돌회피시스템의 성능검증을 위해 COLREGs에 명시된 여러 가지 조우상황을 설정한 시나리오를 이용하여 최적성과 안정성 관점에서 시뮬레이션을 수행하고 그 결과를 $A^{\ast}$ 탐색기법과 비교한다. 시뮬레이션을 통해 제안된 충돌회피시스템이 지능형 선박의 실용적이고 효율적인 실시간 충돌회피시스템으로 적합함을 확인하였다. This paper presents a collision avoidance system for intelligent ship. Unlike collision avoidance system of other unmanned vehicles, the collision avoidance system for intelligent ship aims at not only deriving a reasonable and safe path to the goal but also keeping COLRECs(International Regulations for Preventing Collisions at Sea). The heuristic search based on the BK-products is adopted to achieve the general purpose of collision avoidance system; deriving a reasonable and safe path. The rule of action to avoid collision is adopted for the other necessary and sufficient condition; keeping the COLREGs. The verification of proposed collision avoidance system is performed with scenarios that represent encounter situations classified in the COLREGs, then it is compared with $A^{\ast}$ search method in view of optimality and safety. The analysis of simulation result revels that the proposed collision avoidance system is practical and effective candidate for real-time collision avoidance system of intelligent ship.
강성수(Sung-Soo Kang) 한국산업경영시스템학회 2005 한국산업경영시스템학회지 Vol.28 No.1
The purpose of this study is to develope the model of economy analysis and evaluation to justify the effect of economic feasibility for constructing ERP system in the company. Since the results for the evaluation of alternatives are influenced by the nature of capital and the circumstances, it is very difficult to evaluate the alternatives and it takes too much time to apply it in the field on account of many alternatives. This study suggests establishment and application of the model on economic analysis and evaluation regarding the nature of capital by using excel spread sheets.
강성수(Sung Soo Kang),이원진(Won Jin Lee),박혜정(Hae Jong Park) 한국안광학회 2000 한국안광학회지 Vol.5 No.2
The a-C : H films have been grown on the glass substrate by PECVD method, where plasma was generated with a 60 Hz line power source. The growth rate of films is found to be dependent of the partial pressure of C₂H₂. This growth rate is a little higher than that in which CH₄ instead of C₂H₂ is used. The transmittance is also much higher(95). The optical energy gap of films is in the range of 1.4 -1.8 eV depending on the partial pressure of C₂H₂. However, this energy gap, which is 1.8 eV, is found to be independent of the partial pressure of C₂H₂ for the thick films above 2000 Å. The carbonization is checked from peak intensities of D (sp³) and G(sp²) peaks in Roman spectra. The hydronization and C - H bonding status in films can also be determined from FTIR results. Both the bonding strength of C - H and the ratio of sp³ to sp² in bonding are found to be slightly dependent of partial pressure of C₂H₂. Judging from above results, we can conclude that the best value for partial pressure of C₂H₂ in growing process of thick films is about 13.8.