• 한국군사과학기술학회지
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• 제13권5호
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• pp.818-823
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• 2010

Exploiting models and simulations are encouraged among the defense acquisition society, as now enforced by the Defense Aquisition Program Administration's regulations. They are useful and, sometimes, inevitable especially in an earlier phase of system development. Computer-simulation-based experimentation technique for the system operational performance analysis for a torpedo defense system is introduced in this paper. Problem definition for the torpedo defense system analysis and engineering efforts for models and simulations development are presented here, including defining measures of performance and effectiveness for the torpedo defense system, conceptual modeling for torpedo engagement and defense simulation, design of experimentation, design of simulator and experimentor, and hardware and software implementation of an analysis support tool - a system operations demonstration and experimentation simulator.

• 한국신재생에너지학회:학술대회논문집
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• 한국신재생에너지학회 2006년도 춘계학술대회
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• pp.245-248
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• 2006

The first of korean 750kW gearless type wind turbine is developed. The wind turbine is designed, manufactured and tested by GE regulation and obtained the design certificate by GL. And the performance test is being performed at the demonstration site now. This paper presents the history of development and performance test for 750kW gearless type wind turbine.

• 한국추진공학회:학술대회논문집
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• 한국추진공학회 2008년 영문 학술대회
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• pp.235-242
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• 2008

An innovative Panel ExTension SATellite(PETSAT) and propulsion system for PETSAT, are presented in this paper. First, we outline what PETSAT is. Next, based on PETSAT ethos, design policy of the propulsion system is provided. According to the policy, we designed propulsion system and concretely estimated and assembled mono-propellant and bi-propellant systems, and it indicated that mono-propellant propulsion with 50-60 seconds of specific impulse and 1 N of thrust is probable. In the case of bi-propellant, 120-150 seconds of specific impulse is valid even based on the design policy. We conducted captive tests of mono-propellant and bi-propellant propulsions with a breadboard model of propulsion system for PETSAT, and obtained good operations and performances. Based on the test results, we designed and manufactured flight model propulsion system for PETSAT. We are planning to demonstrate it in SOHLA-2L project progressed by the Space Oriented Higashiosaka Leading Association(SOHLA). SOHLA-2L will be the first on-orbit demonstrator of PETSAT in 2008.

• Current Optics and Photonics
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• 제3권3호
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• pp.227-235
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• 2019

With slimmer, lighter and all-reflective imaging systems in high demand for consumer and military applications, coaxially folded optical image systems are widely considered because they can extend focal length and reduce track length. Most of these systems consist of multiple surfaces, and these surfaces are machined on one element or grouping processing on two elements. In this paper, we report and first experimentally demonstrate an all-aluminum all-reflective optical system which consists of two optical elements, with two high order aspherical surfaces in each element. The coaxially folded system is designed with Seidel aberration theory and advanced optimization with Zemax. The system is made of all-aluminum material processing by single point diamond turning (SPDT). On this basis, we completed the system integration and performed an imaging experiment. The final system has the advantages of short track length and long focal length and broad application prospects in the micro-unmanned aerial vehicle field.

• 한국컴퓨터그래픽스학회논문지
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• 제26권3호
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• pp.143-153
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• 2020

본 연구는 일상 속에서 스트레스를 관리할 수 있는 VR 컬러테라피 힐링콘텐츠 '노르니르'를 구현하고 이를 제안한다. '노르니르'는 CRR 분석법을 적용하여 사용자가 선택한 3가지 컬러에 따라 맞춤형 VR 컬러테라피 체험의 여정을 제공한다. 사용자는 해당 컬러 여정을 통해 자신에 대해 이해하고, 앞으로 실천할 목표를 다양한 색채 인터랙션과 자극으로 제공받으며, 스트레스 수준을 낮추는 힐링이 가능하도록 설계하였다. 구현된 결과를 바탕으로 콘텐츠 시연 후의 사용자의 스트레스 변화를 확인하기 위해 한국판 기분 상태 검사 'K-POMS'를 실험 참가자들을 대상으로 시연 전후에 실시하였다. 실험 결과 사용자들은 부정적 감정의 감소와 긍정적 감정의 증가를 뚜렷이 보였다. VR 기술을 활용하여 색채심리치료룰 접목하여 일상에서 잦은 스트레스에 노출되는 사용자들의 스트레스를 완화 시켜줄 수 있는 가능성을 제시하였다.

• Wind and Structures
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• 제32권1호
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• pp.71-80
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• 2021

In steel cable bridges, the use of magnetorheological (MR) dampers between butt cables is constantly increasing to dampen vibrations caused by rain and wind. The biggest problem in the actual applications of those devices is to launch a kind of appropriate algorithm that can effectively and efficiently suppress the perturbation of the tie through basic calculations and optimal solutions. This article discusses the optimal evolutionary design based on a linear and quadratic regulator (hereafter LQR) to lessen the perturbation of the bridges with cables. The control numerical algorithms are expected to effectively and efficiently decrease the possible risks of the structural response in amplification owing to the feedback force in the direction of the MR attenuator. In addition, these numerical algorithms approximate those optimal linear quadratic regulator control forces through the corresponding damping and stiffness, which significantly lessens the work of calculating the significant and optimal control forces. Therefore, it has been shown that it plays an important and significant role in the practical application design of semiactive MR control power systems. In the present proposed novel evolutionary parallel distributed compensator scheme, the vibrational control problem with a simulated demonstration is used to evaluate the numerical algorithmic performance and effectiveness. The results show that these semiactive MR control numerical algorithms which are present proposed in the present paper has better performance than the optimal and the passive control, which is almost reaching the levels of linear quadratic regulator controls with minimal feedback requirements.

• 디자인학연구
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• 제13권
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• pp.27-42
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• 1996

With the rapid development of nowadays technologies, the environment of product development is experiencing structural changes than ever. Manufacturers are put under never-experienced pressures to launch their products in the market both faster and less expensively than their competitors while continuously improving product quality These pressures have given birth to so-called, Concurrent Engineering which is a systematic approach to the integrated, concurrent design of products and their related processes, including manufacture and support. Most manufactiring companies now recognize the importance of concurrent engineering and put heavy emphasis on the research and impementation of concurrent engineering. However, with this fundamental change in the process of product development, designers rarely pay attention to this newly demanding process. Designers still stay in the middle of process, satisfying their roles in dealing with aesthetic points of product. Designers badly need to incorporate the concept of concurrent engineering to design to design process and to adapt to this new environment. With these backgrounds, the study sets the objective to understand the nature of concurrent engineering and explore the possibility of it's application to industrial design. Particularly this study focuses on how the concept of concurrent engineering can be applied from the stage of form development to prototyping. At first, background, objectives, and scope of the study are discussed as an introductory part. It is followed by reviewing theories of concurrent engineering such as definition, history, technologies, examples, state of art and so on. Subsequently industrial design is viewed in terms of concurrent engineering and problems in industrial design are identified. Base on the findinss of precedent part of study, new process of industrial design incorporating concurrent engineering is developed. For the demonstration of new process, a case study of design of palm-top printer is introduced. Case study shows how the sketch, and forms can be transformed into prototyping with the simultaneous cooperation with engineering and other related specialists. Finally the study in summarized and future studies are prospected.

• Spatial Information Research
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• 제23권6호
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• pp.77-87
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• 2015

지구의 지속가능한 개발에 대한 설계 방법은 자연의 과정과 도시환경을 종합적으로 이해하는 통각적(apperceptive), 전체론적(holistic) 관점을 요구하고 있다. 통각적, 전체론적 조경 설계방법은 분석-계획-설계의 개별 과정이 하나의 환경에서 수반되어져야 하며, 각각의 과정별로 공간에 대한 많은 정보를 제공하여야 하고, 디자인의 결과와 영향에 대한 평가와 이해가 수반되어야 한다. 1969년 "Design with Nature"에서 Ian Mcharg가 제시하였던 지구 전체를 하나의 생태계(Superorganism)로 보는 비젼이 Geodesign의 기술 환경으로 현실화 되어가고 있다. 본 논문에서는 기존 GIS의 지속가능한 설계의 지원한계를 극복하고 수행할 수 있는 Geodesign 조경설계 방법에 대해 고찰하고 선행연구의 분석을 진행하였다. 이와 함께 국외의 Geodesign 사례와 적용 이론들에 대한 고찰을 통해 조경설계를 위한 Geodesign 방법론을 제시하였다. 또한 제시된 방법론을 구현하기 위한 Geodesign 기술과 도구들을 살펴보고, 방법론의 적용을 통해 기술적 가능성, 활용 방안 등을 검토하고, 미래의 조경설계에 있어서 본 방법론이 가지는 잠재력과 효율성을 입증하였다.

• 디자인학연구
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• 제13권1호
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• pp.187-197
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• 2000

본 논문은 최근 디자인계에 대두되고 있는 사용자 중심의 디자인을 위한 노력의 일환으로서 문화인류학의 대표적인 리서치 방법인 애쓰노그래피를 디자인 리서치에 어떻게 적용할 수 있는지에 대한 고찰과 그 구체적인 적용사례를 제시하는 논문이다. 논문은 크게 두 부분으로 구분된다. 먼저, 문헌 고찰을 통한 애쓰노그래피의 기본개념을 소개하고 제품 디자인 영역에서의 "문화"의 개념을 정의내림으로써 디자인 리서치의 내용적 프레임？을 설정하는데 필요한 지식 기반을 구축한다. 둘째로는 감성적 미래형 전자레인지 개발을 목적으로 진행한 프로젝트를 중심으로, 애쓰노그래피가 디자인 리서치에 적용된 구체적인 예를 보여준다. 이 과정은 먼저 애쓰노그래피 리서치를 실행하는 프로세스를 소개하고, 리서치를 통해 얻은 데이터를 분석결과, 그리고 이 결과의 종합을 통한 디자인 암시의 도출을 통해 애쓰노그래피 리서치의 효용성을 논의하는 것으로 구성되어 있다. 이는 구체적인 사례를 통해 향후 디자인 리서치에 애쓰노그래피의 개념을 어떻게 적용할 것인지에 대한 아이디어를 제시하고, 그 활성화를 꾀할 목적으로 진행되었다.적으로 진행되었다.

• Journal of Electrical Engineering and Technology
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• 제9권6호
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• pp.1851-1863
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• 2014

Many countries are increasing their investments in smart grid technology to enhance energy efficiency, address climate change, and trigger a green energy revolution. In addition to these goals, Korea also seeks to promote national competitiveness, prepare for the growth of the renewable energy industry, and export industrialization through its strategic promotion of the smart grid. Given its inherent representativeness for Korean implementation of the smart grid and its growth potential, Jeju Island was selected by the Korean government as the site for smart grid testing in June 2009. This paper presents a new design for the electricity market and an operational scheme for testing Smart Electricity Services in the Jeju smart grid demonstration project. The Jeju smart grid test-bed electricity market is constructed on the basis of day-ahead and real-time markets to provide two-way electricity transaction environments. The experience of the test-bed market operation shows that the competitive electricity market can facilitate the smart grid deployment in Korea by allowing various demand side resources to be active market players.