• International Journal of Automotive Technology
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• 제6권3호
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• pp.235-242
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• 2005

This study introduces the Reliability-Based Design Optimization (RBDO) to enhance the kinematic and compliance (K & C) characteristics of automotive suspension system. In previous studies, the deterministic optimization has been performed to enhance the K & C characteristics. Unfortunately, uncertainties in the real world have not been considered in the deterministic optimization. In the design of suspension system, design variables with the uncertainties, such as the bushing stiffness, have a great influence on the variation of the suspension performances. There is a need to quantify these uncertainties and to apply the RBDO to obtain the design, satisfying the target reliability level. In this research, design variables including uncertainties are dealt as random variables and reliability of the suspension performances, which are related the K & C characteristics, are quantified and the RBDO is performed. The RBD-optimum is compared with the deterministic optimum to verify the enhancement in reliability. Thus, the reliability of the suspension performances is estimated and the RBD-optimum, satisfying the target reliability level, is determined.

• 국제초고층학회논문집
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• 제5권4호
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• pp.251-262
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• 2016

Tall Buildings have been one of the most prominent symbols of economic growth for nearly a century. Yet, in the aftermath of the tragedies of September 11, "signature" Tall buildings have become the focus of much debate. The structural systems today are undergoing a major evolution to address the ability of providing flexibility in the design and use of the building together with sustainability (Green) and cost-effective system. This paper describes a new invented structural system, evolutionary structural analysis and design of Tall buildings, which involves the entire analysis process, including conceptual and design stages and comparison with the existing Tall building. This study presents an new innovative structural system, Beehive (Hexagrid), for Tall buildings. The final results are achieved by modeling an 80 story Tall building with the optimized angle and topology of hexagon members by using a computer analysis, ETABS finite element analysis. The objective function of this system is to use one structural system in order to both maximize Eigen frequency for resisting dynamic responses and minimize mean compliance for static responses. Finite element analysis is carried out by using standardized materials. Optimal Hexagrid topologies with the highest stiffness are finally determined to resist both static and dynamic behaviors. Holistic design integration approaches between structures and facades to save energy for environmental control are studied. Innovative design ideas to control structural motion as well as to utilize that motion to harness energy are discussed. Considering abundant emergence of tall buildings all over the world in recent years, the importance of the studies presented in this paper cannot be overemphasized for constructing more sustainable built environments.

• 디지털융복합연구
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• 제18권12호
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• pp.59-68
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• 2020

본 연구는 시대의 흐름에 따라 기업이 요구하는 창조혁신형 미래 디자인 인력양성의 방향성을 제시하고자 한다. 디자인인력의 역량변화에 대응하는 창조혁신형 디자인 인력양성을 위한 정책사례연구를 통해 디자인 인력 정책의 변화, 산·학·관의 사례를 살펴보고자 한다. 창조혁신형 디자인고급인력양성 사업의 대표적인 사례인 산학프로젝트 사례분석을 통하여, 이 과정에 실제 기업이 참여하여 사업화가 가능한 제품개발 과정을 경험하도록 하는 새로운 교육모델이 필요하다는 것을 발견하였다. 본 연구는 디자인산업에 필요한 창조혁신형 인력을 양성하기 위한 프로그램개발 관련 정책 수립의 기초자료로 활용이 가능할 것으로 기대한다.

• Journal of Mechanical Science and Technology
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• 제18권10호
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• pp.1722-1729
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• 2004

This paper presents a design methodology for determining configurations of slider air bearings considering the randomness of the air-bearing surface (ABS) geometry by using the iSIGHT. A reliability-based design optimization (RBDO) problem is formulated to minimize the variations in the mean values of the flying heights from a target value while satisfying the desired probabilistic constraints keeping the pitch and roll angles within a suitable range. The reliability analysis is employed to estimate how the fabrication tolerances of individual slider parameters affect the final flying attitude tolerances. The proposed approach first solves the deterministic optimization problem. Then, beginning with this solution, the RBDO is continued with the reliability constraints affected by the random variables. Reliability constraints overriding the constraints of the deterministic optimization attempt to drive the design to a reliability solution with minimum increase in the objective. The simulation results of the RBDO are listed in comparison with the values of the initial design and the results of the deterministic optimization, respectively. To show the effectiveness of the proposed approach, the reliability analyses are simply carried out by using the mean value first-order second-moment (MVFO) method. The Monte Carlo simulation of the RBDO's results is also performed to estimate the efficiency of the proposed approach. Those results are demonstrated to satisfy all the desired probabilistic constraints, where the target reliability level for constraints is defined as 0.8.

• 대한건축학회논문집:구조계
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• 제35권4호
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• pp.167-174
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• 2019

Cable-stayed structures provide a lot of possibilities toward the development of innovative structural forms regarding their expressiveness and uniqueness. Such cable-stayed structures, as form-active structures, can obtain a family of alternatives by changing parameters for defining geometric shapes. The concept of graphic statics is utilized to explain the relationship between the load path and structural forms because the load path of cable structures has something to do with their structural geometry. Moreover, this structural geometry has a dominant effect on both structural efficiency and structural elegancy. The proposed design method in this study will help designers conceive innovative structural forms considering structural safety, material efficiency, and structural art altogether.

• 기술혁신연구
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• 제23권4호
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• pp.205-244
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• 2015

최근 빠른 기술과 시장의 변화에 대응하여, 기업의 생존과 성장을 위한 동태적 역량의 하나로 기업의 양면성 조직 특성에 대한 중요성이 강조되고 있다. 빠른 환경변화에도 불구하고 지속적으로 높은 성과를 보이고 있는 기업은 신제품 기술개발역량 측면에서 기존 제품의 점진적 혁신을 통한 활용적 역량과 함께 새로운 시장 및 기술에 대한 탐험적 역량 둘 모두를 구축하고 균형을 갖는 양면성 조직의 특성을 갖는다. 본 연구는 기술혁신 중소기업이 양면성 조직을 구축 및 운영하는 이유와 방법, 기업의 생존과 성과에 미치는 영향을 분석하였다. 외부 환경변화에 따른 기업의 내부적 기술혁신전략과 기업성장단계가 양면성 조직 특성과 성과에 영향을 미친다. 양면성 조직 특성은 구조, 맥락, 리더십 관점으로 접근하였으며, 연구 분석을 위해 제품의 산업적 특성을 달리하는 3개 중소기업에 대해 다중사례분석을 수행하였다. 종단적 분석을 통해, 제품의 산업적 특성과 환경 변화에 대응하는 기업의 기술혁신전략 유형에 따라 양면성 조직의 구축 및 운영의 해법이 다르며, 구조, 맥락, 리더십 관점의 양면성 조직 특성이 상호 보완적으로 작용하였다. 또한, 양면성 조직 특성이 중소기업의 생존과 성과에 중요한 특성임을 확인하였다.

• International Journal of Computer Science & Network Security
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• 제22권10호
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• pp.31-36
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• 2022

In modern socio-cultural conditions, the requirements for the quality of professional training of graduates of higher educational institutions are increasing. This issue has become especially acute with the advent of pandemic conditions. The ability to apply the existing competencies in the situation of challenges of the 21st century to solve complex social and professional problems is an important criterion for the quality of higher education. Modern professional art education is undergoing many reforms and transformations. Particular attention is paid to innovative teaching methods, thanks to which future specialists experience the breath of innovative education. This issue is especially relevant during the spread of the COVID-19 pandemic. Since students of creative specialties must also have certain competencies, within the framework of the educational process, the competence-based approach to teaching plays a key role, is the methodological basis in the system of modernization of higher professional art education. Thus, the main task of the study is to analyze the process of formation of professional competence among students of art institutions of higher education in the context of COVID-19. As a result of the study, the main aspects of the process of formation of professional competence among students of art institutions of higher education in the context of COVID-19 were investigated.

• 건축사
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• 11호통권463호
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• pp.59-62
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• 2007

• 대한핵의학회:학술대회논문집
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• 대한핵의학회 1990년도 제29차 춘계학술대회
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• pp.213.1-213.1
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• 1990

• 전산구조공학
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• 제36권3호
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• pp.4-10
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• 2023