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황태경 ( Hwang Tae-kyung ),양재장 ( Yang Jae-jang ) 한국호텔리조트학회(구 한국호텔리조트카지노산학학회) 2016 호텔리조트연구 Vol.15 No.4
From trust in food origin is one of the most basic information consumers to learn about the food. Information on the origin, because the consumer can not see directly into the eyes provide the producer information using state-of-the-art systems, such as QR codes to provide a variety of information about the origin indication or origin, or how to sell your own products in the origin use. One of these methods in the food industry to buy the products that can be produced by a trusted origin. In this study analysis of physical risk, psychological risk, time risk, economic risk and social risk factors affecting the intended repurchase of local food to provide a basis for future practical implications and local food development and marketing. Survey conducted a total duration of 10 days until may 15 days from may 6, 2016, the subject was surveyed for the local food buying customer. With the help of a professional survey research firm it had conducted an Internet survey, conducted by collecting 293 parts of an analysis of the insincerity of respondents in one survey results, except 26 parts to 267 parts. Analysis spss 21.0 was used. Analysis, physical risk was found to have a negative effect on the re-purchase intention. Psychological risk for local food was found to have a negative effect on the re-purchase intention. Temporal risk for local food was found to have a negative effect on the re-purchase intention. Social and economic risk for local food was found which does not affect the re-purchase intention.
황태경(Tae-kyung Hwang),김형근(Hyung-kun Kim),김성은(Seong-eun Kim) 한국추진공학회 2012 한국추진공학회 학술대회논문집 Vol.2012 No.11
본 논문은 평균값과 Allowable 값 기준의 구조 안전율과 구조 신뢰도와 관계 비교를 통해 복합재추진기관의 확률적 구조 설계 방법을 설명하였다. 일반적으로 복합재 압력용기의 평균 값 기준의 구조 설계는 1.5이상의 구조 안전율과 0.999 이상의 구조 신뢰도 값이 요구된다. 요구 압력 기준의 0.999의 구조 신뢰도를 만족하기 위해서 평균 값 기준의 구조설계는 섬유 강도의 변동률에 따라 다른 구조 안전율을 부여해야한다. 그러나 이미 섬유 강도 변동률이 고려된 Allowable 값을 이용할 때는 고정된 안전율이 부여된다. 이상의 해석 결과로 볼 때 섬유 강도는 복합재 압력용기 구조 설계에 가장 중요한 설계 변수이고, 우수한 성능의 복합재 추진기관을 개발하기 위해서는 섬유 강도의 변동률이 최소화되어야 함을 알 수 있었다. This paper describes a probabilistic structural design method of composite propulsion system by comparing safety factor based on average value and allowable value with structural reliability. Generally, the required structural safety factor and reliability of composite pressure vessel are 1.5 and 0.999, respectively. In the case of structural design using average strength, the safety factor which satisfies the required structural reliability depends on the variation of fiber strength. However, the structural design using allowable value shows constant safety factor for the variation of fiber strength, because the allowable value of fiber strength is calculated by considering the variation of fiber strength. Through the analysis results, it was known that the fiber strength is the most important design random variable for the structural design of composite pressure vessel and the variation of fiber strength must be minimized to develop the high performance composite propulsion system.
황태경(Tae-Kyung Hwang),임오강(O-Kaung lim),이진식(Jin-Sick Lee),이종옥(Jong-Ok Lee) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.4
Major concern in modern industry is how to reduce the time and cost for product efficient production.<br/> Among many mechanical parts of a satellite, bracket plays an important role to support the load when the<br/> satellite is launched to space. so enough strength and stiffness. A designer could add unnecessary material and<br/> strength it so as not to fail when it used. But if mechanical part of satellite is over-designed, cost will rise and<br/> it also goes against to the aim of lightness. To achieve lightness and enough strength and stiffness,<br/> optimization algorithm should be introduced in design process. In this study, conceptual design of bracket is<br/> carried out to increase the performance of satellite. Some parameter which could change the weight of this<br/> part are selected as design variables. Total weight of bracket is to be minimized while displacement and stress<br/> should not exceed limit. Size optimization is done with 3D solid element and PLBA, the RQP algorithm. The<br/> weight of 0.262kg of initial model is reduced to 0.241kg after optimization process, so 9.8% of weight<br/> reduction is obtained.