http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
자동조립에서 시뮬레이트 어닐링을 이용한 조립순서 최적화
홍대선,조형석,Hong, Dae-Sun,Cho, Hyung-Suck 대한기계학회 1996 大韓機械學會論文集A Vol.20 No.1
An assembly sequence is considered to be optimal when is minimizes assembly cost while satisfying assembly constraints. To derive such an optimal sequence for robotic assembly, this paper proposes a method using a simulated annealing algorithm. In this method, an energy funciton is derived inconsideration of both the assembly constraints and the assembly cost. The energy function thus derived is iteratively minimized until no further change in energy occurs. During the minimization, the energy is occationally perturbed probabilistically in order to escape from local minima. The minimized energy yields an optimal assembly sequence. To show the effectiveness of the proposed method, case studies are presented for industrial products such as an electrical relay and an automobil alternator. The performance is analyzed by comparing the results with those of a neural network-based method, based upon the optimal solutions of an expert system.
Study on the Modelling of Effective Coding Puzzle Game for Infant Learning
홍대선,유미,이형구 (사)한국컴퓨터게임학회 2018 한국컴퓨터게임학회논문지 Vol.31 No.3
In this paper, we analyze the modeling of educational coding games, implement coding games that are effective for infants and children, and evaluate the suitability for children. After analyzing the learning concepts, UI system, and characteristics of game system that are core to various coding puzzle games on the market, new puzzle game is developed based on these analytics. The learning concepts, UI system and game system of the developed game are introduced and the mock-up and practical course of the daycare center where the developed game is applied is described. The evaluation process for all three items of concept visualization, intuitive element, and difficulty control were evaluated (each 5 perfect score) by daycare center teachers for the game developed to determine the level of play in practice. The developed game displayed 4.08 points in the intuitive element, 3.72 points in difficulty control, and 3.44 points in concept visualization, all with above-normal results. For the visualization of concepts, the application of formatting that can be used in the concept itself, for the intuitive elements the application of clear elements that signal the beginning and end of stages, and for the difficulty control the application of exercise chapter were found to be the main factors.
전기자동차 충전기 쿨링시스템의 성능에 관한 실험적 연구
홍대선,최두한,공석환,김태우,임경석 한국산학기술학회 2022 한국산학기술학회논문지 Vol.23 No.12
As the global automobile market is rapidly changing from internal combustion engines to electric vehicles, the number of charging stations for electric vehicles continues to rise. For rapid charging, fast chargers are frequently used, and high current flows through the cable that connects a fast charger to a battery in electric vehicles. Also, heat is usually generated by the electric resistance of the charging cable. This heat causes a temperature rise in the cable and reduces the battery charging efficiency. Therefore, it is necessary to develop a cooling system that can solve these problems. An oil pump was used in a cooling system for transporting oil that absorbs heat. In this study, a series of experiments were conducted to verify the appropriate rotational speed of the oil pump for minimizing power consumption while maintaining the required cooling performance. Through these experiments, we investigated how the cooling capacity and power consumption change according to the rotational speed of the oil pump. Based on the results of the experiments, the appropriate rotational speed was derived. In conclusion, it is possible to reduce the power consumption of an electric vehicle charger's cooling system by using the appropriate rotational speed for the proposed oil pump. 세계 자동차 시장은 내연기관차에서 전기자동차로의 전환이 빠르게 이뤄지고 있으며, 이에 따라 전기자동차 충전인프라가 지속적으로 증가하고 있다. 전기자동차의 충전을 위한 급속충전기와 전기자동차 배터리를 연결하는 케이블에는 고전류가 흐르게 되는데, 이 과정에서 충전 케이블의 전기 저항에 의해 열이 발생된다. 이 열은 케이블 및 충전기의온도를 상승시켜 충전 효율을 감소시키게 되는데, 이러한 효율 감소를 해결하기 위해서는 케이블 냉각을 위한 쿨링시스템이 요구된다. 쿨링시스템에서 냉각유 펌프는 충전 케이블에서 발생한 열을 흡수하여 이동시키는 역할을 한다. 본 연구에서는 쿨링시스템의 냉각능력을 일정 수준으로 유지하면서 소비전력을 최소화하기 위한 냉각유 펌프 회전속도를 산출하기 위해 실험을 진행하였다. 본 실험을 통해 냉각유 펌프의 회전속도에 따라 냉각능력과 소비전력이 어떻게 변하는지분석하고, 이를 통해 쿨링시스템의 효율적인 펌프의 회전속도를 제안하였다. 제안된 냉각유 펌프의 적합한 회전속도를통해 전기자동차 충전기 쿨링시스템의 소비전력 절감이 가능하다.