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수학적 계획법을 이용한 복층 볼트시스템의 구조최적화 방안
김호수(Kim Ho-Soo),박영신(Park Young-Sin),이한주(Lee Han-Joo) 대한건축학회 2009 大韓建築學會論文集 : 構造系 Vol.25 No.10
This study presents the shape decision and structural optimization techniques for the double-layer vault system. Double-layer vault system takes less weight than general space frame structures and is widely used with the advantages of the lightweight structure, mass production and quick construction. But, the initial design of double-layer vault system depends on the structural engineer's experience and the repeated trial and error. Therefore, the optimization of double-layer vault system by controling displacement and stress needs a method to determine the optimal shape. First, this study develops the shape decision method for modeling double-layer vault system and presents the size and shape optimization techniques that can select main design valuables according to the radius of curvature, lattice division and height. Also, the automated computation of joint coordinates and numbering technique, and automatic input of the load are considered for the shape modeling. Finally, the optimal design and algorithm using sensitivity analysis technique through mathematical programming method are verified through the analysis example.
김호수(Kim, Ho-Soo) 대한건축학회 2013 大韓建築學會論文集 : 構造系 Vol.29 No.4
The stone pagoda structures have been constructed in outside place and are exposed at various damages due to the physical phenomenon and natural disaster. Especially, the damage of stylobate has an effect on the safety of the whole structure because the stylobate on the foundation supports the upper structures and loads. Therefore, the various design variables are derived through the investigation for the several damages in stylobate and influence factors on the whole structure. Also, this study evaluates the mechanical behavior characteristics for the representative models considering the stylobate damage factors through the structural analysis and modelling. Through the analysis results, the damage factors in the stylobate occur the stress concentration on the neighbor elements and influence on the safety of the whole structure.
스페이스 프레임 돔 구조물의 최적화를 위한 형상생성 방안
김호수(Kim Ho-Soo),박영신(Park Young-Sin),양명규(Yang Myung-Kyu),이한주(Lee Han-Joo) 대한건축학회 2009 大韓建築學會論文集 : 構造系 Vol.25 No.12
Space frame system is applied to various parts of large spatial dome structures. Especially, space frame dome structure is composed of traditional shape or the combinations of various shapes and new design. In this case, the big difference in the total weight and behavior of structures is shown, based on the selection of space frame dome structure and the difference of member connection, even if they have same size and height. For this reason, it is not easy to decide the optimal shape in the design of this system. Therefore, this study presents the shape generation method and then try to develop the shape generation module. To this end, the node and member generation technique is formulated to consider the characteristics of shapes through the various example selection of space frame dome structure. Also, various example models are presented for efficiency evaluation of the shape generation technique and optimization results are compared through the application of optimization algorithm.
스페이스 프레임 돔 구조물의 형태생성 및 강성최적화 이력에 따른 구조성능 분석
김호수(Kim, Ho-Soo),박영신(Park, Young-Sin),이민호(Lee, Min-Ho),오주영(Oh, Ju-Young) 대한건축학회 2012 大韓建築學會論文集 : 構造系 Vol.28 No.1
Space frame structures have the different shapes according to generation principle and member connection method. Thus, space frame dome structures need the optimal shape design method according to requirements. The optimal design method for space frame structures generally adopts the size and shape optimization method that aims at optimal weight. This optimization method shows the results which consider the minimum weight with appropriate shapes from stress and displacement constraints. But, it is not easy to secure the maximum stiffness of structure because the optimal weight design is established by the given constraint conditions. Therefore, this study finds out the optimal structural shape that has the maximum stiffness through the stiffness optimization method. To this end, we first select the various types of space frame dome structures and generate the dome structure shapes using VBA(Visual Basic for Application). Also, we consider the various load conditions and perform the optimal stiffness design for the performance comparison of dome structures. In this way, the total weights and displacements are evaluated during the stiffness optimization process according to the height variations of dome structures.
김호수(Kim Ho-Soo) 대한건축학회 2011 大韓建築學會論文集 : 構造系 Vol.27 No.5
This study analyzes the structural characteristics and load transfer mechanism according to the construction types of stylobate and body part of the typical traditional stone pagoda structure. To this end, the construction and structural types are compared between two typical stone pagodas in the Goseon-sa and Jeongnim-sa temple sites. Also, the discontinuum structural modelling and discrete element analysis are performed in order to analyze the structural behaviors of stylobate and body part, and the resonable constitutive models of block and joint are considered. Especially, the structural characteristics and safety according to the construction types of stone pagodas are verified through the comparisons of stress and displacement distributions between the discrete elements of stylobate and body part.
김호수,김정환,Kim, Ho-Soo,Kim, Jung-Hwan 한국공간구조학회 2015 한국공간구조학회지 Vol.15 No.3
Cheomseongdae is the masonry stone structure with the cultural and historical values. But, this structure has the various damages such as cracks, gaps, slope variations and ground subsidence. So, the interests for the safety security in the structural parts have been increased. Therefore, this study performs the structural modelling which considers the several damage cases, and then evaluates the structural behavior characteristics through the discrete element analysis. Especially, this study checks the swelling and displacement gap of the whole structure and the separation between the neighboring members.
김호수,이찬주,김소은,지창윤,김성태,김진석,김상용,곽상수,Kim, Ho Soo,Lee, Chan-Ju,Kim, So-Eun,Ji, Chang Yoon,Kim, Sung-Tai,Kim, Jin-Seog,Kim, Sangyong,Kwak, Sang-Soo 한국식물생명공학회 2018 식물생명공학회지 Vol.45 No.3
고구마는 21세기 인류가 당면한 식량, 에너지, 환경, 보건문제 등을 해결하는 21세기 구원투수로 등장하고 있다. 고구마는 식량자원 뿐만 아니라 바이오에탄올, 기능성 사료, 항산화물질 등 고부가가치소재를 생산하는 생체반응기로 평가된다. 미국 공익과학단체(The nonprofit Center for Science in the Public Interest, CSPI)는 고구마가 저분자항산화물질, 식이섬유, 칼륨 등을 고함유하고 있는 고구마를 몸에 좋은 10대 슈퍼식품 가운데 하나로 선정하였다. 미국 농무부는 고구마를 전분작물 가운데 식량수급에 영향을 최소화하는 척박한 토양에 가장 적합한 바이오에너지작물로 평가하였다. UN 식량농업기구는 2050년에 세계인구가 97억 명이 될 것이며 지금 추세로 식량을 사용하면 2050년에는 지금의 1.7배의 식량이 필요하다고 전망했다. 어떻게 미래 식량위기를 극복할 것인가? 이러한 측면에서 척박한 토양에서도 어느 정도 수량을 보장하는 고구마가 지구가 당면한 제반 문제를 해결할 수 있을 것으로 기대된다. 본 논문에서는 세계 고구마 유전자원과 생산현황을 살펴보고, 글로벌 식량자원 및 고부가가치 바이오소재 측면에서 새로운 고구마의 북방로드 개척 및 상업적 대량재배를 위한 선결과제를 기술하고자 한다. Sweetpotato [Ipomoea batatas (L.) Lam] represents an attractive starch crop that can be used to facilitate solving global food and environmental problems in the $21^{st}$ century. It can be used as industrial bioreactors to produce various high value-added materials, including bio-ethanol, functional feed, antioxidants, as well as food resources. The non-profit Center for Science in the Public Interest (CSPI) announced sweetpotato as one of the ten 'super foods' for better health, since it contains high levels of low molecular weight antioxidants such as vitamin-C, vitamin-E and carotenoids, as well as dietary fiber and potassium. The United States Department of Agriculture (USDA) also reported that sweetpotato is the best bioenergy crop among starch crops on marginal lands, that does not affect food security. The Food and Agriculture Organization (FAO) estimated that world population in 2050 will be 9.7 billion, and require approximately 1.7 times more food than today. In this respect, sweetpotato will be a solution to solving problems such as food, energy, health, and environment facing the globe in the $21^{st}$ century. In this paper, the current status of resources, and cultivation of sweetpotato in the world was first described. Development of a new northern route of the sweetpotato and its prior tasks of large scale cultivation of sweetpotato, were also described in terms of global food security, and production of high-value added biomaterials.
변위민감도 해석을 이용한 삼차원 고층철골조 구조물의 횡변위 제어에 관한 연구
김호수(Kim Ho-Soo),이한주(Lee Han-Joo) 대한건축학회 2004 大韓建築學會論文集 : 構造系 Vol.20 No.9
This study presents an effective Stiffness-based optimal technique to control quantitatively lateral drift for 3-D steel frameworks subject to lateral loads To this end, the displacement sensitivity depending on behavior characteristics of 3-D steel frameworks is established Also, the approximation concept that can preserve the generality of the mathematical programing and can efficiently solve large scale problems is introduced Resizing sections in the stiffness-based optimal design are assumed to be uniformly varying in size and the technique of member grouping is considered for the improvement of construction efficiency Two types of 30-story frames are presented to Illustrate the features of the quantitative lateral drift control technique proposed in this study<br/>