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교육 시설 생활인프라 특성을 고려한 지역 프로파일링 연구 - 서울시 광진구 중심으로 -
강우석,이희정,Kang, Woo-Seok,Lee, Hee-Chung 한국교육시설학회 2019 敎育施設 Vol.26 No.5
This study has a purpose to profile local sectors into meaningful groups by using facilities rates of Social Overhead Capital(SOC) for daily life. Comparing SOC for daily life among the meaningful groups, the profiling and comparison results bring the comprehensive understanding about the educational facilities in local sectors. For the research purpose, this study utilized Latent Profile Analysis(LPA) by using variables such as population, road information, SOC for daily life, usage of land, possession of land, and appraised value of land from the 2018 Geographic Information System(GIS) dataset of Gwangjin-gu, where is one of the administrative district of Seoul City. Results showed that there are four latent groups of sectors among 904 local sectors(100 squared-meters sector per each) in Gwangjin-gu. By comparing the four latent groups by using LPA, the results diagnose each sector's status and help to improve the policy about educational facilities. Specifically, by using dataset for SOC of daily life, there are four groups of local sectors and each group has different features. Based on the different features of local sector groups, there can be improved management of educational facilities matching with each group's features.
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강우석,고중혁,Kang, Woo-Seok,Koh, Jung-Hyuk 한국전기전자재료학회 2014 전기전자재료학회논문지 Vol.27 No.12
Energy problem has been issued in worldwide because fossil fuel has being almost exhausted. A lot of renewable energy have been received attention to replace the energy from fossil fuel. Among them, piezoelectric energy harvester is one of excellent candidates. In general, micro scaled small sized energy harvesters were usually based on the lithography process. However, these lithography process require complicated process and high cost. In this paper, a new process has been proposed for micro-scaled piezoelectric energy harvester. $0.2Pb(Mg_{1/3}Nb_{2/3})O_3-0.8Pb(Zr_{0.52}Ti_{0.48})O_3$ composition was used as piezoelectric material due to excellent piezoelectric properties and also can be easily prepared by mixed oxide method.
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배아와 건축 구조의 위상기하학적 유비(類比, analogy)를 응용한 파빌리온 디자인 제안
강우석 ( Kang Wooseok ),채정우 ( Chae Jungwoo ) 한국공간디자인학회 2021 한국공간디자인학회논문집 Vol.16 No.3
(연구배경 및 목적) 모든 동물의 형태는 다양한 분화 과정을 거쳐 복잡한 기관들을 지닌 하나의 개체로 창조된다. 생물체의 형태는 수정란이 수정 직후 분열과 조직화 등의 다양한 상호 작용에 의해 성장하는 기초적 단계를 거쳐 발생한다. 이러한 자연의 모든 대상의 초기 단계에서 형태는 배아 구조와 위상적 동형을 이루고 있다. 이 초기 단계 중 내배엽, 중배엽, 외배엽으로 분화되는 상태의 낭배기 단계(囊胚期, gastrula stage)에서 배아는 생명의 각 조직 기관으로 발생한다. 이와 같이, 배아가 성체로 발생하는 과정 동안에 생명의 동력을 위한 기능의 부여, 형태 및 구조의 발생, 그리고 성장을 유발하는 공간과 시간의 종합적 조절 등이 결정적으로 작용한다. 디자이너가 만들어내는 건축물은 배아의 초기 발생 상태와 유사한 시스템을 내포하고 있다. 건축물의 배아의 창발(emergence)적 과정과 유비적 관계를 파악함으로써, 위상기하학적 건축 동향에 따라 변화하는 담론을 심화하기 위한 새로운 사례의 디자인을 진행한다. 현대의 비정형적이고 유기적인 공간을 재현하기 위해 실제로 현대의 기술을 접목하여 새로운 생물의 발생적이고 동역학적인 공간 디자인 작품 연구를 진행함에 목적을 둔다. (연구방법) 본 연구는 배아가 유연하고 확장하는 발생적 매커니즘의 특징을 활용하여 일시적이고 가변적인 파빌리온의 구조를 계획한다. 첫 번째로 발생 생물학적 관점에서 배아의 분화 개념 및 배아의 배엽 형성의 위상기하학적 특성을 파악하기 위한 선행 연구가 진행되고, 건축의 위상기하학적 맥락과 특성을 파악하여 배아와의 유비(類比, analogy)적 개념 요소를 도출한다. 이 요소들을 적용할 파빌리온의 합목적성을 문헌 연구를 통해 탐구하고 디자인 적용 단계를 진행한다. 선행 연구를 바탕으로 배아의 구조적 요소를 고려한 외피와 구조, 그리고 내부 공간을 설정하여 형태를 구체화한다. 그리고 분화된 각 배엽 층의 기능적 요소에 따른 공간 물성, 프로그램 및 기능을 대입하여 모델링과 렌더링 결과물을 산출한다. (결과) 본 연구는 동물의 진화 과정에서 공통적 요소를 보이는 배아 구조의 발생 생물학적 의미와 이 중 생명 기관의 최초 창발 단계인 낭배기와 건축적 요소 간 유비 관계에 대해 분석하였다. 이는 디자인에 활용하기 위한 비선형적 구조모델, 동역학적 소재, 유기적 공간 프로그램의 기능 등으로 시뮬레이션하고, 실제 현대 기술로 생물의 유기적이고 자체적으로 변화하는 유기적 구조를 대입할 가능성을 제시한다. (결론) 이는 상징적이고 은유적인 형태로서 생물의 외관만을 적용하는 방식의 일차원적 단순성을 지양하고, 생물학에서의 형태 발생, 즉 발생 생물학에 기초한 생물의 자기조직화적 알고리즘으로부터 추출되는 성장, 적응, 진화 매커니즘을 응용하여 건축 자체의 유연한 성질을 지님에 의미가 있다. 더하여, 새로운 현대 공간의 디지털 기술로 이러한 생명의 자체적 적응성을 적용하여 앞으로 생물 발생적 건축의 가능성 확대를 위한 새로운 사례로 활용할 수 있을 것이다. (Background and Purpose) All animals are created for individuals equipped with complex organizations through the differentiation process. Living beings’ formation process emerges from various interactions such as cell division and systematization when the primary embryo stage, which is defined as the topologically same shape. In particular, in the gastrula stage divided into three germ layers known as ectoderm, mesoderm, and endoderm, the embryo is differentiated to each organ. During the process from the embryo to maturity, it decisively requires the supply of functions to sustain its life force, which leads to the emergence of the formative structure, the comprehensive space-time control inducing its growth, and so on. After figuring out the analogical relationship between the architectural structure and the primary embryo, it proceeds to study the dynamic spatial design involved with the life force, aiming for the intensification of topological architecture discourse. (Method) This study propels the design of a pavilion in the public space by utilizing the developmental mechanism of the fluid and replicative embryo. First, after analyzing the initial concept of the embryonic differentiation and formative process with regard to developmental biology, it is investigated for the topological properties of the embryo in the stage to prove that topologically, the torus geometry has the same shape. Second, the comparative study between the embryo’s structure and the space composition of modern architecture deduces the analogical concept. Following the purpose of using the pavilion after the relationship, design application includes structured process experiments for establishing interior, exterior, and connecting space in the pavilion based on the analogical relationship. Material selection on the surface is influenced by dynamics and self-organization features, which results in applying the principle of bimetal, new material to the architecture skin. Lastly, the shape is materialized through the interior program planning, modeling, and rendering with Rhino 3D and Grasshopper. (Results) In conclusion, the result implies that there are common elements among an animal’s embryonic emergence processes regarding the topological perspective. Furthermore, the analogy between biological organism and non-biological structure is practically applied to the pavilion design, which appears to the nonlinear prototype model, kinetic material, and organic space program for another design application. (Conclusions) Instead of the simplicity of the method to copy the appearance of life as a symbolic shape, modern architecture has worked itself through the essential mechanism of biological form and morphogenesis. Thus, due to the new technologies and digital base, it is expected that this independent adaptability of living beings would be used as a new example of the intensified architecture in various ways.
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석탄화력 내 암모니아 혼소율에 따른 연소 및 NOx 발생 특성에 대한 전산해석 연구
강우석(Woosuk Kang),조현빈(Hyunbin Jo),류창국(Changkook Ryu) 한국연소학회 2021 KOSCOSYMPOSIUM논문집 Vol.2021 No.11
This study analyze the combustion and NOx emission characteristic of NH₃ cofiring in a commercial pulverized coal boiler using computational fluid dynamics (CFD). Four different methods of NH3 supply at a cofiring ratio of 10% on a higher heating value(HHV)-based thermal input were evaluated while fixing total stoichiometric ratio at 1.08 and that for the burner zone at 0.84. In addition to advanced coal conversion models, global reaction mechanism for NH₃ combined with fuel and thermal NOx mechanisms was established for preliminary evaluation of NH₃ cofiring. For the reference case, the CFD results showed reasonable agreement with the operation data in terms of heat distribution and NOx emission. When NH3 was cofired, the total heat absorption significantly decreased by lower flame temperatures. However, the boiler efficiency was similar on a lower heating value (LHV) base. Therefore, the thermal input of NH₃ and corresponding boiler effienciy need to be determined using the LHV. NOx emission increased by NH₃ cofiring but significant differences were observed between the cofiring method. In particular, concentrating NH₃ supply in a particular burner level exhibited lower NOx emission, indicating that NH₃ cofiring method can be optimized to reduce the NOx emission. The NOx emission required further investigations with an improve NH₃ combustion model.
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CO 포함 방산 배가스의 연소효율 향상을 위한 수치해석 연구
강우석(Woosuk Kang),조현빈(Hyunbin Jo),김태영(Taeyoung Kim),조한창(Hanchang Jo),류창국(Changkook Ryu) 한국연소학회 2020 KOSCOSYMPOSIUM논문집 Vol.2020 No.9
Some off-gases from a steel making process contains high concentration of CO which requires to be removed by oxidation at the flare stack. One way to achieve this is to install oxy-combustion gas burner at the shield of the flare stack for ignition of the off-gas. Using computational fluid dynamics (CFD), this study investigates the influences of design and operation parameters for the flare stack including different levels of CO concentration in the off-gas, tilting and yawing of four oxy-combustion gas burners, wind speed, pre-mixing of natural gas. The off-gas was difficult to maintain the flame because of its low energy content and excessive cooling by large volume of entrained air despite the use of oxy-combustion burner for heat-up and ignition. The flame was maintained only when the CO concentration in the off-gas was over 25% at the quiescent air condition, which achieved 99.7% of CO removal. Adjusting the burner angle was helpful in increasing CO oxidation inside the shield but was not successful in keeping the flame above. Pre-mixing natural gas inside the stack also increased the level of CO oxidation but has a cost issue. The optimal condition for near-complete CO oxidation were determined from the combustion efficiency and safety of the flare stack.
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