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트럭-트레일러 차량을 이용한 최적 수배송 경로의 설계 및 운영에 관한 연구
송광현(Kwang Hyun Song),이영해(Young Hae Lee),조동원(Dong Won Cho),이상근(Sang Geun Lee) 한국SCM학회 2012 한국SCM학회지 Vol.12 No.1
Truck-trailer is the form of combined trailer with vehicle. In recent years, truck-trailer routing problem is introduced and operated for land transport efficiency in various industry. A global logistics company and the domestic distribution company specializing in truck-trailer can reduce delivery time, loading, and carbon emissions. In order to operate a truck-trailer, the operation planning for both truck-trailer vehicle and truck-trailer route are very important. Truck-trailer routing problem could be extended from the existing vehicle routing problem. In this studies, truck-trailer routing problem is formulated using the mathematical optimization model. In order to obtain the solutions for this problem in polynomial time, hybrid genetic algorithm combined with 3-optimal heuristic is proposed. In addition, the effectiveness for the proposed model and algorithm will be demonstrated by using numerical experiment.
송광현(Kwang-Hyun Song),고윤석(Yon-Seok Ko),이우철(Woo-Cheol Lee) 한국전자통신학회 2014 한국전자통신학회 논문지 Vol.9 No.12
의료기기중 체외에서 인체로 물리적 에너지를 가하거나 그 의료기기의 에너지를 이용하여 인체의 화학적 변화를 이용하여 치료를 하는 것은 고도의 신뢰성과 안정성이 요구된다. 특히 인체의 모든 부분 중 가장 외부로 노출되어있는 피부에 대한 치료는 매우 중요 하다고 할 것이다. 이러한 관점에서 보았을 때 피부 치료 시발생 할 수 있는 모든 위험 요소를 줄이고 치료의 효과를 극대화 할 수 있는 장비의 개발은 높은 치료 효과와 안전성 확보를 위하여 반드시 필요하다고 할 것이다 Among the medical devices, medical treatments inflicting physical energy from the outside of the body to the inside or using the energy from the devices which take advantages of chemical changes of the human body require a high degree of reliability and safety. In particular, the medical treatment on the most exposed skin to the external surface in all parts of the human body will be very important. In this perspective, when you undergo skin treatment, you need to reduce all risks and to maximize the effect of treatment equipment. Therefore, the development of equipment which guarantees high therapeutic efficacy and safety is essential.
교수 경험이 예비 영어교사의 교수 효능감에 미치는 영향
송광현(Kwang-Hyun Song),김지영(Jie Young Kim) 한국영어어문교육학회 2022 영어어문교육 Vol.28 No.4
This study investigates the impact of the 2022 Pre-service teachers' tutoring program on the self-efficacy of pre-service English language teachers. Online surveys, teacher logs, and interview results were analyzed to examine the changes in teacher efficacy. Online surveys based on Kwon's (2017) teaching efficacy scale were conducted before and after the tutoring program. The teaching efficacy scale consisted of the following constructs: motivational strategy, practice and feedback, material development and utilization, explanation and questioning, and encouragement of self-directed learning. In addition, follow-up interviews were conducted with each teacher and transcribed. A deductive coding scheme was developed based on the teaching efficacy constructs, and the interview transcripts were repeatedly read and coded according to the scheme. The results indicated that teaching experience improved the efficacy of pre-service English language teachers. Teacher efficacy improved when teachers enhanced their learners' motivation and achievement using appropriate teaching strategies and learning materials. Enactive experiences were the most influential factor in teacher efficacy. On the contrary, teacher efficacy decreased because of the difficulty in communicating with students and providing feedback in speaking activities. This result implies that it is important to learn how pre-service teachers can increase learners’ motivation and their self-efficacy by practicing it through teaching practice.
이제혁(Lee, Jae-Hyuck),송광현(Song, Kwang-Hyun),김필수(Kim, Pil-Soo) 대한건축학회 2013 대한건축학회논문집 Vol.29 No.6
Korean evangelical churches have adopted contemporary worship style from the U.S. to reach out to non-Christian and young generation since the late 1980s, This movement resulted more churches grown as mega churches and demands for mega worship space have been raised. However, mega worship space need to resolve functional problems due to the size, and contemporary worship style also requires new functional needs from its program. To understand these needs and requirements, six American mega worship spaces were selected as precedents and analyzed in three main components of space; room shape, seating area, and stage. As a result, we found out the characteristics of the three main components influenced by the size of worship room and contemporary worship style. For example, room shapes were formed to reduce the overall size, seating was arranged to enhance the contemporary worship, and stages were sized to accommodate the large number of performers for new worship style. The results will also be valuable resources for future mega worship space development in Korea.
신경회로망을 이용한 반능동 현가시스템 인식과 슬라이딩 모드 제어
송광현,김희선,이창구,김득중 전북대학교 공업기술연구소 1997 工學硏究 Vol.28 No.-
In this paper a neural networks system modeling and sliding mode suspension controller are proposed. The new neural networks is an error self-recurrent neural networks. For the fast on-line learning, this paper propose a recursive least squares method. The proposed neural networks converges considerably faster than the back-propagation algorithm and has advantages of being less affected by the poor initial weights and learning rate. The controller for suspension systems is designed according to sliding mode technique based on new proposed neural networks.