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강길모,장덕희,최용진,Kang, Gil-Mo,Jang, Duckhee,Choi, Yong-Jin 한국해양바이오학회 2014 한국해양바이오학회지 Vol.6 No.2
The aim of this project is to develop an adaptive and collective National Marine Biotechnology Plan for the next decade(2014~2023) which is able to reflect current and future changing environment. This effective strategy targets to foster marine-derived active bio-materials, marine bioenergy production technology and many promising technologies in order to promote marine biotechnology industry as a next-generation growth engine. Marine biotechnology industry based on R&D activities since 1980 has been growing as an emerging industry. This new field enables to secure exclusive patent rights and to find new potential bio-active materials from the ocean that requires long-term aggressive R&D investments. The current policy direction is to raise appropriate level of R&D investment because the current Korea's national marine biotechnology R&D fund ratio is less than 2% of the total national biotechnology R&D budget. The result shows three major strategies. First, it recommended a research implementation system and supporting policy that includes establishment of open innovation framework for the 'Industry-Academia-Research Institute Collaborations', strategic research planning and enhanced policy making process. Second, it derived state-of-the-art or new technology in many areas. Third, it formulated more detailed execution plans for successful R&D support and set up performance indicator system in related R&D program.
혁신적 재설계 상황에서의 시스템 아키텍팅을 위한 유전자 알고리즘
강길모,홍유석 대한산업공학회 2014 대한산업공학회 춘계학술대회논문집 Vol.2014 No.5
Recently identifying optimal solution in engineering design, researchers are often confronted by difficulties arising from complex system. In principle, the optimal solution to such problems can be found by even enumeration or simple heuristics; however, in practice it is frequently impossible where the number of feasible solutions can be extremely high. Re-architecting modular systems in innovative redesign has such difficulties; especially for practical problem of realistic size, the explosive increase of feasible alternatives compared becomes the most challenge. In this paper, a genetic algorithm is proposed in order to intelligently search feasible solutions rather than enumerating and comparing. Solution encoder, a heuristic feasibility operator, fitness evaluator, and select/replacement model are tailed specifically for re-architecting problem in innovative redesign. The present algorithm was demonstrated with hydrogen-fueled internal combustion engines (H₂ICEs), which are developed based on the traditional internal combustion engines, as an example case of the innovative redesign. The results showed that the proposed genetic algorithm is to make a good balance between exploration and exploitation of the search space.
강길모,김현민,신오순 한국통신학회 2014 정보와 통신 Vol.31 No.12
본 고에서는 차세대 5G 이동통신 무선접속 후보 기술에 대해 살펴본다. 4G 이동통신 기술은 OFDM 전송 기술의 적용으로 인해 데이터 전송률 향상 및 서비스 다양화 등의 측면에서 큰 성능 향상을 이루었다. 하지만 4G에 비해서도 월등히 향상된 성능을 추구하는 5G 이동통신 구현을 위해서는 근본적으로 주파수 효율성 향상이 필요하다. 본 논문에서는 주파수 효율성 향상을 위한 연구 중 하나로서 새로운 무선접속(Air Interface) 기술에 대한 최근 연구 동향을 살펴보고 후보 기술들이 OFDM 기술을 비롯한 다른 방식들에 대해 갖는 장단점을 분석한다.
강길모,홍유석 대한산업공학회 2013 대한산업공학회 춘계학술대회논문집 Vol.2013 No.5
Many recent manufacturers in various industries constantly modify or redesign existing products with inserting new technologies to retain their competitiveness. While most of the design research has concentrated on creating new product, few studies have conducted how to redesign the preceding product having its own architecture. This paper proposes a new methodology for re-architecting the modular product with accommodating new required changes is proposed. The proposed method defines re-architecting operators through the use of a design structure matrix (DSM) technique to systemically operate pre-existing modules. Re-architecting strategies and corresponding new architectures are then generated by the combinations of applying the operators to modules. The proposed methodology selects the best one in terms of modularity among the alternative architectures realized with re-architecting strategies. As a result, the best architecture that changes the original system as little as possible and has high modularity is determined through developing algorithms which control the operators.
지상-공중 NOMA 기반 UAV 통신시스템의 주파수 효율 최대화 기법
강길모,신오순 한국통신학회 2023 韓國通信學會論文誌 Vol.48 No.1
비직교 다중접속(Non-Orthogonal Multiple Access: NOMA) 기술은 높은 주파수 효율과 대규모 연결을 지원할수 있어 차세대 통신 네트워크 성능 향상의 주요 기술 중 하나이다. NOMA를 무인항공기(Unmanned Aerial Vehicle: UAV) 통신시스템 적용하기 위해서는 최적의 전력할당 및 부대역 스케쥴링(Sub-band Scheduling)이 수반되어야 한다. 본 논문에서는 Sparse Code Multiple Access (SCMA)를 이용하는 NOMA 기반의 지상 및 UAV 통신시스템의 자원 공유 모델을 기반으로 지상 사용자에 대한 Quality of Service (QoS) 요구사항을 만족하면서UAV 통신시스템의 주파수 효율을 최대화하는 알고리즘을 제안한다. 먼저 SCMA 코드북 할당 최적화 알고리즘을통해 지상 사용자의 주파수 효율을 최대화하고, UAV 통신은 지상 사용자의 QoS 요구조건을 만족하는 조건 하에서 지상 사용자와 주파수 자원을 공유하면서 주파수 효율을 최대화한다. 제안하는 최적화 문제는 UAV 통신을 위한 자원할당과 아울러 지상 사용자와 UAV의 송신 전력할당을 동시에 하는 혼합 정수(Mixed-Integer) 비볼록(Nonconvex) 문제이다. 이 문제의 해를 효율적으로 구하기 위한 방법으로 휴리스틱 탐색(Heuristic Search) 알고리즘과 1차 내부 근사화 기법을 제안한다. 모의실험을 통해 제안한 알고리즘의 수렴 특성 및 주파수 효율 성능을검증한다.
고상확산접합된 Haynes230의 인장성질에 미치는 접합조건의 영향
강길모,전애정,김홍규,홍성석,강정윤,Kang, Gil-Mo,Jeon, Ae-Jeong,Kim, Hong-Kyu,Hong, Sung-Suk,Kang, Chung-Yun 대한용접접합학회 2013 대한용접·접합학회지 Vol.31 No.3
This study investigated the effect of bonding temperature and holding time on microstructures and mechanical properties of diffusion bonded joint of Haynes230. The diffusion bonds were performed at the temperature of 950, 1050, and $1150^{\circ}C$ for holding times of 30, 60, 120 and 240 minutes at a pressure of 4MPa under high vacuum condition. The amount of non-bonded area and void observed in the bonded interface decreased with increasing bonding temperature and holding time. Cr-rich precipitates at the linear interface region restrained grain migration at $950^{\circ}C$ and $1050^{\circ}C$. However, the grain migration was observed in spite of short holding time due to the dissolution of precipitates to base metal in the interface region at $1150^{\circ}C$. Three types of the fracture surface were observed after tensile test. The region where the coalesce and migration of grain occurred much showed high fracture load because of base metal fracture whereas the region where those did less due to the precipitates demonstrated low fracture load because of interface fracture. The expected fracture load could be derived with the value of fracture area of base metal ($A_{BF}$) and interface ($A_{IF}$), $Load=201A_{BF}+153A_{IF}$. Based on this equation, strength of base metal and interface fracture were calculated as 201MPa and 153MPa, respectively.