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최광묵,민계료,Choe Gwang-Muk,Min Gye-Ryo 한국국방경영분석학회 1986 한국국방경영분석학회지 Vol.12 No.1
When the ICM is fired in the artillery weapon, it is necessary to determine rounds of munitions for sufficient damage to targets of different sizes and shapes. This paper analyzes all kinds of delivery errors involved in ICM firing, and then develops the target coverage model appropriate for ICM salvos. This model is evaluated through computer simulation. The expected target coverage is measured according to number of salvos, range and probable error, velocity error, battery arrangement, target size, and shell reliability respectively.
Al-Si계 합금의 분말 크기 및 조성에 따른 반사율 변화 특성
최광묵,채홍준,Choi, Gwang Mook,Chae, Hong Jun 한국분말재료학회 (*구 분말야금학회) 2019 한국분말재료학회지 (KPMI) Vol.26 No.1
In this study, the effects of powder size and composition on the reflectance of Al-Si based alloys are presented. First, the reflectance of Al-Si bulk and powder are analyzed to confirm the effect of powder size. Results show that the bulk has a higher reflectance than that of powder because the bulk has lower surface defects. In addition, the larger the particle size, the higher is the reflectance because the interparticle space decreases. Second, the effect of composition on the reflectance by the changing composition of Al-Si-Mg is confirmed. Consequently, the reflectance of the alloy decreases with the addition of Si and Mg because dendrite Si and $Mg_2Si$ are formed, and these have lower reflectance than pure Al. Finally, the reflectance of the alloy is due to the scattering of free electrons, which is closely related to electrical conductivity. Measurements of the electrical conductivity based on the composition of the Al-Si-Mg alloy confirm the same tendency as the reflectance.
탄소섬유 드레이핑 및 수지 유동 해석을 통한 CFRP 제조용 RTM 금형 설계
최광묵,채홍준 한국금형공학회 2019 한국금형공학회지 Vol.13 No.1
This paper presents the design strategy for the optimal RTM molds of Carbon Fiber Reinforced Plastic (CFRP) by carbon fiber draping and resin flow simulation. First, the mold shape and molding condition were determined considering the undercut and die face of the product in the draping simulation, which made the preliminary shape of the product by compressing the carbon fiber. After that, the diffusion behavior during the injection of resin in the mold was predicted by the resin flow simulation. Finally, the optimal mold shape was designed by selecting the locations of resin injection port and vent based on total results of simulations. In this paper, the mold of automotive side mirror case was selected as the representative product. Also, the actual mold was manufactured based on the simulation design to confirm the practicality of it. This study is expected to contribute to the industry as a technology to improve the reliability and productivity of CFRP producted by RTM process.
최광묵,Dae Guen Kim,Byoungyong Im,Hong Jun Chae 대한금속·재료학회 2019 METALS AND MATERIALS International Vol.25 No.4
To fabricate a low-refl ectance aluminum alloy, we have analyzed the changes in refl ectance according to the morphology,components, and composition of the aluminum alloy. We fi nd that the larger the particle size of the powder, the lower is therefl ectance. This is attributed to the fact that the larger the particle size, the greater is the amount of light absorbed into theinterparticle space in the powder. In addition, the refl ectance decreases with increase in the Si and Mg contents, because ofthe lower refl ectance of the strengthening phase formed in the alloy as compared to that of aluminum. In contrast, lanthanideaddition causes an increase in the refl ectance, which is attributed to an increase in the electrical conductivity of the alloy.
Cu 첨가에 따른 SKD11의 기계적 , 열적 특성 변화
최광묵,채홍준 한국주조공학회 2019 한국주조공학회지 Vol.39 No.6
Cu-added SKD11 was manufactured through the casting process and the effects of Cu addition with different contents (0, 1, 2 and 3 wt%) and aging treatment on microstructure, mechanical characteristics such as tensile strength and hardness, and thermal conductivity were investigated. The microstructure was analyzed by FE-SEM and XRD, the mechanical characteristics by Rockwell hardness tester and Tensile tester, and the thermal conductivity by Laser flash. As a result, SKD11 containing Cu had higher hardness than as-received SKD11. The hardness of as-cast SKD11 containing 1 wt% Cu was 42.4 HRC, whereas the hardness of asreceived SKD11 cast alloy was 19.5 HRC, indicating that the hardness was greatly improved when Cu was added. In the case of tensile strength, Cu-added SKD11 cast alloy had lower tensile strength than as-received SKD11, and the tensile strength tended to increase as Cu content increased. After heat treatment, however, tensile strength of as-received SKD11 was significantly increased, whereas in the case of Cu-added SKD11, as the Cu contents increased, the tensile strength increased less and even reduced at 3 wt% Cu. The thermal conductivity of Cu-added SKD11 cast alloy was about 13 W m−1 K−1, which was lower than that of the asreceived SKD11 cast alloy (28 W m−1 K−1). After the heat treatment, however, the thermal conductivity of as-received SKD11 was reduced, while the thermal conductivity of the SKD11 added with Cu was increased. Thermal conductivity was generally larger with less Cu content, and this tendency became more pronounced after heat treatment.
최광묵,이호현,신강욱,홍성택,Choi, Kwangmook,Lee, Hohyun,Shin, Gangwook,Hong, Sungtaek 한국정보통신학회 2020 한국정보통신학회논문지 Vol.24 No.9
상수도 배관은 땅속에 매설되어 있어서 배관의 노후화에 따른 누수를 맨눈으로 탐지하기가 불가능하며, 누수음을 감지함으로써 배관의 누수를 탐지하는 기술이 주로 사용된다. 본 논문에서는 상수도 배관의 양단에 두 개의 가속도계를 부착·취득한 데이터 간의 도달 시간 차이를 계산하여 누수 지점을 탐지하는 알고리즘을 개발하였다. 배관의 누수 시험은 17.2m의 배관에 4.3m, 8.6m, 12.9m 지점에 밸브를 설치하고, 밸브의 개도율을 30%, 70%로 변경해 가면서 누수 지점을 분석하였으며, 밸브가 30%, 70%씩 개방된 정도의 배관 내 압력 강하에 대해서는 누수를 탐지할 수 있는 것으로 확인되었다. 초기 단계의 누수를 탐지하는 것이 매우 중요하며, 본 연구에서 적용한 알고리즘으로부터 초기의 누수 지점의 탐지가 가능할 것으로 판단된다. Water pipes are laid on the ground, making it impossible to visually detect leaks due to aging of pipes, and technology to detect leaks in pipes is mainly used to detect leaks in pipes by detecting leaks. In this paper, two accelerometers were attached to both ends of the constant water piping to calculate the time difference between the acquired data to detect leakage points. The leak test of piping was performed by installing valves at 4.3m, 8.6m, and 12.9m points on piping 17.2m, and changing the development rate of valves to 30% and 70%. Leakage can be detected for pressure drop in piping, which is 30% and 70% open valve. It is very important to detect leakage in the early stage, and it is judged that detection of the initial leak point from the algorithm applied in this paper will be possible.
최광묵(Kwangmook Choi),차기춘(Gichun Cha),유병준(Byoungjoon Yu),박지환(Jihwan Park),임정현(Junghyun Im),박세환(Sehwan Park),박승희(Seunghee Park) 한국방재안전학회 2018 한국방재안전학회 논문집 Vol.11 No.1
스마트도시란 도시의 경쟁력과 삶의 질 향상을 위하여 건설·정보통신기술 등을 융·복합하여 건설된 도시에 다양한 도시서비스를 제공하는 지속가능한 도시이다. 본 기고에서는 국·내외 스마트도시 추진동향과 지방자치단체의 스마트도시 조직을 분석하여 지속가능한 스마트도시 구현을 위해 지방자치단체의 스마트도시 조직체계 추진방향을 기술하고자 한다. Smart City is a sustainable city that provides a variety of city services to cities that are built with a mix of construction, information and communication technologies, etc. to improve the competitiveness and quality of life of the city. In this paper, we analyze trends of domestic and foreign smart cities and the smart city organization of local governments, and describe the direction of local government’s smart city organization system to realize sustainable smart city.