• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.36 no.4
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• pp.384-392
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• 2008

Design sketch of electrical power system, mass, and cost of a new satellite is an inevitable step preceding the full-scale development of the satellite. In this paper, major features of recently developed conceptual design tools of satellites are investigated. And, based on the surveying results, we summarize the conceptual design procedure of satellites. The required electrical power to support the operation of the payload mission determines the size of solar panel and battery. The mass of the integrated system and subsystems is then estimated based on the database of the previously developed satellites. Cost can also be roughly estimated using the database without consideration of complex calculations.

• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.49 no.10
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• pp.859-870
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• 2021

KARI (Korea Aerospace Research Institute) is developing a design framework for the concept and preliminary design of eVTOL aircrafts. A low fidelity mission analysis tool was developed for the eVTOL aircrafts of Lift-Tilt Concept, which have tilt propellers and lift propellers, using open source SUAVE package. For its development, a review for the propeller performance analysis functionality was made. To find the trim solution at each mission segment automatically, an algorithm is implemented, using a global optimization technique through parallel processings and DOE(design of experiment). Using the tool, the one seated eVTOL OPPAV(optionally piloted personal air vehicle) was modeled and evaluated, which results were compared with the preliminary design data.

• 대한공업교육학회지
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• v.34 no.1
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• pp.129-154
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• 2009

The purpose of this study was to find the effect of intuitive free association and systematic free association on the creativity of high school students group in the conceptual design process. Based on this study result, the conclusion can be summarized as follows. 1. There was meaningful relation between intuitive free association and creativity factor of high school students. Mean value of experimental group A 's creativity and it's factor originality, practicality, elaboration, and fluency which treated intuitive free association was increased. 2. There was meaningful relation between systematic free association and creativity factor of high school students. Mean value of experimental group B 's creativity and it's sub factors: originality, problem solving, elaboration, and fluency which was treated systematic free association was increased. 3. It was found that two different divergent thinking does not show any meaningful difference in creativities of two groups. However, the meaningful difference was found in post creativity test in each groups sub-factors. There was meaningful difference in practicality factor, though there was no meaningful difference in originality, elaboration, fluency factors. Using the obtained results, it was concluded that intuitive thinking and systematic thinking play different roles in practicality which is one of sub-factors of the creativity of high school students. Consequently, it can be concluded that systematic thinking which leads students to take a step to solve a given problem can elicit more scientific thinking, and helps students create more practical solution in problem solving than intuitive thinking that emphasize the quantitative aspect of ideas.

• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.42 no.6
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• pp.478-487
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• 2014

The simplified performance analysis and initial configuration design are required for the successful development of UAV during the conceptual design, in which empirical formulas and trend equations are utilized for the UAV performance analysis. In the conceptual design phase various UAV configurations may be considered, however, it is very inefficient and unnecessary to consider all configurations for the conceptual design. In this study, the database for the fixed wing UAVs whose MTOW is between 50kg and 1,500kg was also constructed for the selection of configuration frequently used. The parametric analyses were performed for major performance parameters, and trend equations were developed through regression analyses for these individual performance parameters.

• Proceedings of the IEEK Conference
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• 1998.06a
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• pp.855-858
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• 1998

본 연구에서는 MML(merged memory logic)구조를 갖는 스캔라인 컨버터를 설계하여 제안한다. 비월주사 방식인 TV 비디오 신호를 FIFO 메모리에 저장하여 순차주사방식인 VGA 비디오 시모호 변환하는 주사선 변환기를 MML 개념으로 설계하였다. MML 회로는 VHDL로 설계하여 V-system으로 시뮬레이션을 수행하고 altera FPGA에 구현한 후, TV 비디오 신호를 PC 모니터로 보기 위한 외장형 tV 수신 시스템에 적용하여 성능을 검증했다. MML 개념으로 설계된 컨버터는 system-on-a-chip 설계의 첫 단계로 메모리와 로직부분으로 구성된 일반적인 컨버터보다 효율적인 시스템 설계를 할 수 있다.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2004.05a
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• pp.227-227
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• 2004

오늘날과 같은 무한 경쟁 시대 속에서 기업은 신제품을 좋은 품질을 유지하면서 얼마나 빠르게 시장에 출시하느냐가 기업의 경쟁력을 좌우하게 되었다. 이를 위해서는 설계 단계부터 제품 생산 단계까지의 주기를 단축시켜야만 한다. 이 때 설계 단계의 비용이 가장 크며 많은 시간이 소비된다 물론, 품질에 가장 커다란 영향을 미치는 부분도 바로 설계 단계인 것은 두말할 필요가 없을 것이다. 이에 본 논문에서는 제품 개발에서 중요한 설계 단계를 CPC(Collaborative Product Commerce) 개념을 도입하여 웹에 기반을 둔 설계 지원 시스템을 구축하였다.(중략)

• Proceedings of the Korea Information Processing Society Conference
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• 2010.04a
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• pp.958-961
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• 2010

본 논문에서는 고객의 초기 요구 문서인 문제 기술서로부터 문장 분석을 통하여 개념클래스를 도출하는 방법에 대하여 제안한다. 문제기술서는 개발할 시스템에 대한 고객의 요구사항을 개괄적으로 작성된 문서로서 요구사항을 분석하고 설계할 때 이용되는 초기 문서 역할을 한다. 개발자는 이 문서의 내용을 바탕으로 시스템에 중요한 개념클래스를 도출하는 작업을 시작한다. 시스템 개발에 사용될 개념클래스들을 도출하는 것은 객체지향적인 설계에서 중요한 과정이다. 문서 기술서로부터 개념클래스 도출 과정은 주로 개발자의 경험과 직관에 의존하는 경향이 있으며 경험이 많은 전문 개발자들은 문제 기술서로부터 개념클래스들을 올바르게 도출할 수 있지만 초보 개발자의 경우 도출에 어려움이 따른다. 이러한 문제점의 개선 방법으로 기술서의 문서에서 문장 단위로 형태소 분석을 통하여 명사와 동사를 추출한다. 추출된 명사를 통하여 2가지 분류 기준에 따라 개념클래스 도출하고, 이후 동사를 이용하여 개념클래스 간의 관계 설정하는 방법을 제안한다.

• Journal of the Korean Institute of Landscape Architecture
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• v.45 no.6
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• pp.171-184
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• 2017

The designers pursue the thoughtful and wide thinking through the accumulation of knowledge and cultivation of insights for making use of high-level design philosophy and language. The purpose of this study is to investigate characteristics of concept figuration types based on designer's 'memory' in landscape design. The results of this study are as follows. First, the design idea starts to be based on the language and image memory of the designer. The figuration types are composed of the verbal and visual view which are representative communication means. Second, the verbal concept figuration of landscape design consists of two types. The symbolic language of the title as a design theme can be a 'phrase', and it should have a hierarchial balance between the master and the sub. 'Descriptive shape of conceptual scenario' is a text that expresses the concept narratively in order that the reader virtually experiences designed landscapes. Third, visual concept figuration of landscape design is divided into three types. 'Simple visualization of a diagram' is easily embodied through a simple graphic using symbols, comments, images and key words. 'Concept sketch and shape of core idea' is useful to grasp the core of the idea such as physical element, form attribute of space and spatial relation at the initial phase of the concept. 'A collage and montage that create a new shape with a combination of images' are a collection of materials and images that provide a new perspective. These are tools to depict them in a compressed way after recording landscapes phenomenon.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.2 no.2
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• pp.25-31
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• 2001

The TRIZ theory which was invented by Russian scientist Genrich Altshuller provides a systematic methodology for innovative engineering design in place of brainstorming. synectics, analogical thinking, which seeming1y high efficiency are still variations of the trials and errors method. TRIZ theory gives designer the ability to explore design solutions in fields other than his (her) own experience. Among several TRIZ theories, most widely used techniques in engineering field are contradiction theory. Su-Field analysis, physical phenomenon and effect and directed production evolution. which are described in this thesis and its application to conceptual design of high-speed train is performed as a case study of TRIZ theory.

• Aerospace Engineering and Technology
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• v.3 no.1
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• pp.277-286
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• 2004

In this study, summary of past tilt-rotor concept development presented, and based on that, major pros and cons of tilt-rotor technology compared to other air-vehicle concept was presented. Also presented were major design features, considerations and sizing constraints of tilt-rotor configuration implemented to the development of Smart UAV. It is hoped that this paper be served to understand the tilt-rotor air-vehicle design and development.