• Journal of Computing Science and Engineering
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• 제6권4호
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• pp.257-266
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• 2012

This paper overviews clock design problems related to the circuit reliability in deep submicron design technology. The topics include the clock polarity assignment problem for reducing peak power/ground noise, clock mesh network design problem for tolerating clock delay variation, electromagnetic interference aware clock optimization problem, adjustable delay buffer allocation and assignment problem to support multiple voltage mode designs, and the state encoding problem for reducing peak current in sequential elements. The last topic belongs to finite state machine (FSM) design and is not directly related to the clock design, but it can be viewed that reducing noise at the sequential elements driven by clock signal is contained in the spectrum of reliable circuit design from the clock source down to sequential elements.

• 농촌계획
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• 제15권4호
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• pp.11-17
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• 2009

Rural Amenity Design Competition is opened every year since 2003 having an intention of improving spatial design and planning of rural area through developing values of rural amenity resources and applying in that area. The subject of this competition is broad and there's no limit in locations so that various solutions and original ideas could be proposed. This research examined 165 prizewinning works of the competition and analyzed the locations and areas, aims, main resources, spatial planning contents and experience programs to find out trends of rural spatial design. According to the study, the prizewinning works tends to 1) include spatial plan for an existing village planning, 2) aim rural tourism for citizens and increasement of resident's incomes, 3) develop vegetation and agricultural resources, 4) plan for natural landscape, commercialization of local special productions and agriculture, and 5) propose ecological experience programs. The same theme of the competition repeated every year had led to advanced design skills but also a stagnant of design contents. A subject and a main goal of the Rural Amenity Design Competition should be departmentalized each time hereafter to make for the weak points and propose progressive direction for the rural spatial design.

• 한국추진공학회:학술대회논문집
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• 한국추진공학회 2008년 영문 학술대회
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• pp.130-135
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• 2008

An aerodynamic optimization design process of multistage axial turbine is presented in this article: first, applying quasi-three dimensional(Q3D) design methods to conduct preliminary design and then adopting modern optimization design methods to implement multistage local optimization. Quasi-three dimensional(Q3D) design methods, which mainly refer to S2 flow surface direct problem calculation, adopt the S2 flow surface direct problem calculation program of Harbin Institute of Technology. Multistage local optimization adopts the software of Numeca/Design3D, which jointly adopts genetic algorithm and artificial neural network. The major principle of the methodology is that the successive design evaluation is performed by using an artificial neural network instead of a flow solver and the genetic algorithms may be used in an efficient way. Flow computation applies three-dimensional viscosity Navier Stokes(N-S) equation solver. Such optimization process has three features: (i) local optimization based on aerodynamic performance of every cascade; (ii) several times of optimizations being performed to every cascade; and (iii) alternate use of coarse grid and fine grid. Such process was applied to optimize a three-stage axial turbine. During the optimization, blade shape and meridional channel were respectively optimized. Through optimization, the total efficiency increased 1.3% and total power increased 2.4% while total flow rate only slightly changed. Therefore, the total performance was improved and the design objective was achieved. The preliminary design makes use of quasi-three dimensional(Q3D) design methods to achieve most reasonable parameter distribution so as to preliminarily enhance total performance. Then total performance will be further improved by adopting multistage local optimization design. Thus the design objective will be successfully achieved without huge expenditure of manpower and calculation time. Therefore, such optimization design process may be efficiently applied to the aerodynamic design optimization of multistage axial turbine.

• Bulletin of the Korean Chemical Society
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• 제27권5호
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• pp.699-704
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• 2006

Escherichia coli RNase P is a ribonucleoprotein composed of M1 RNA and C5 protein. Previously, analysis of RNA aptamers selected for C5 protein from a synthetic RNA library showed that C5 protein could bind various RNA molecules as an RNA binding protein. In this study, we searched cellular RNA motifs that could be recognized by C5 protein by a genomic SELEX approach. We found various C5 protein-binding RNA motifs derived from E. coli genomic sequences. Our results suggest that C5 protein interacts with various cellular RNA species in addition to M1 RNA.

• 디자인학연구
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• 제15권3호
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• pp.201-212
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• 2002

본 연구는 첨단 디자인에 있어서의 정보의 인식과 그것의 처리방식에 관한 것이다. 20세기말 이후의 발전된 과학과 테크놀로지의 도움에 의해서 디지털 디자인이 성립될 수 있었다. 첨단 디지털 디자인은 인간의 삶을 보다 풍요롭고 편리지향으로 유도하고 있으며, 앞선 과학의 기술적인 호응에 의해 크나큰 진보가 이룩될 수 있었다. 21세기의 우주과학과 가상현실에 의한 첨단디자인은 컴퓨터의 도움에 의해서 빠른 정보의 처리능력과 다양한 기법의 개척으로 인하여 더욱 진전된 산업문명을 이끌어갈 것으로 예측되고 있다. 디자인은 경쟁관계에 있는 국제사회와 경제환경에 결정적인 영향을 주고 있으며, 그것은 생산과 판로의 형성에 거대한 변화를 야기하는 것이기도 하다. 가상현실과 시뮬라시옹을 성립한 첨단 과학은 이 시대를 새로운 디자인의 혁명시대로 유도하기에 이르렀으며, 이미지의 자유스런 유영을 가능하게 하였다. 특히, 원래의 이미지를 잘게 부수고 그것을 재 조합하는 과정에서 보다 큰 결실을 이룩할 수 있었다. 현대문명을 이끌어가고 있는 고도로 발전된 정보제어 기술은 우주의 인공위성과 광통신망을 바탕으로 하여 우리의 시각적인 범주를 훨씬 이탈해 있는 첨단 정보를 송수신할 수 있을 뿐만 아니라, 정보체계의 인프라를 구축하는 인류의 혁신적인 과학문명의 진보를 의미하는 것이다 테크놀로지와 복원과학의 힘에 의해서 발전된 정보처리 방식은 예술가들의 새로운 리얼리티로 부상되어 21세기의 예술과 디자인에 있어서의 거대한 변화를 몰고 올 것이다.

• International Journal of Aeronautical and Space Sciences
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• 제11권2호
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• pp.126-130
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• 2010

This paper presents the conceptual design of a multi-rotor unmanned aerial vehicle (UAV) based on an axiomatic design. In most aerial vehicle design approaches, design configurations are affected by past and current design tendencies as well as an engineer's preferences. In order to design a systematic design framework and provide fruitful design configurations for a new type of rotorcraft, the axiomatic design theory is applied to the conceptual design process. Axiomatic design is a design methodology of a system that uses two design axioms by applying matrix methods to systematically analyze the transformation of customer needs into functional requirements (FRs), design parameters (DPs), and process variables. This paper deals with two conceptual rotary wing UAV designs, and the evaluations of tri-rotor and quad-rotor UAVs with proposed axiomatic approach. In this design methodology, design configurations are mainly affected by the selection of FRs, constraints, and DPs.

• 한국디자인학회:학술대회논문집
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• 한국디자인학회 2001년도 Bulletin of The 5th Asian Design Conference International Symposium on Design Science
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• pp.66.1-66
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• 2001

• Design & Manufacturing
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• 제6권2호
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• pp.17-23
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• 2012

In April 2010, the die and mould grand prix for university student was held in Osaka as a special event of Inter Mold Japan. The students from Korea, China, and Japan participated to demonstrate the design and manufacturing skill of die and mould. Based on the given product drawing of Test Work, progressive die should be designed and manufactured. Also, production of Test Work should be carried out. This study had been conducted to participate in the grand prix and to learn practical knowledge and experience from real die design and making. Test Work is made of SPCC and includes piercing, blanking, deep drawing and burring. From the analysis of product drawing, process planning and die design was carried out. Progressive die for Test Work was manufactured using CNC milling, grinding, wire-cutting and polishing. The production was successfully completed using mechanical press and product showed very good accuracy satisfying all dimensional tolerances.

• 디자인학연구
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• 제17권4호
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• pp.159-168
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• 2004

국내에서 디자인 제 영역에 걸친 이론적이고 실제적인 학문적 탐구는 1979년 한국디자인학회 창립 이후 80년부터 시작된 디자인학 연구를 필두로 한다. 이때부터 학술교류를 통한 사회적 공헌 및 학문적 연구는 많은 성장을 이루었다. 본 연구에서는 지난 24년간 이루어진 디자인학 연구동향에 대한 분석을 위해 국내 대표 학회지인 ‘디자인학연구’와 ‘기초조형학연구’를 각 1호부터 최근호까지의 논문을 총 2065편 수집하였다. 논문분석을 통해 현재까지 이루어진 국내 디자인학연구의 현황을 조명하고 향후 연구방향을 ㅈ시하고자 함이 본 연구의 주 목적이다. 자료분석을 위한 통계적 기법으로는 빈도분석과 기술통계를, 그리고 유목의 관찰빈도와 기대빈도의 차이를 검증하기 위해 카이스퀘어($X^2$) 검증을 실시하였다. 검증결과 학술적 교류를 통한 디자인학의 역할이 증대되면서 연구논문의수가 꾸준히 증가하는 것을 알 수 있었고, 전체적인 분포현황은 디자인기반연구, 디자인응용연구, 디자인기초연구의 순으로 나타났다. 연구방법론에 있어서는 실증연구가 꾸준히 증가하였는데, 이는 디자인학이 객관적이고 과학적인 연구를 우해 커뮤니케이션학의 사회조사방법론을 많이 활용하기 때문이다.

• Design & Manufacturing
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• 제16권4호
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• pp.7-16
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• 2022

A helmet is essential for safety when operating personal mobility. However, user's actual helmet wear rate is low due to the inconvenience of wearing and poor ventilation. In this study, a new helmet structure with improved ventilation for personal mobility devices was designed. To design a new structure with improved breathability compared to the existing helmet while satisfying the safety regulations for the helmet, a generative design method was applied to the shock-absorbing liner of the helmet. In addition, other materials were applied to create a structure with improved ventilation while maintaining safety. The generated design result was verified for shock absorption through simulation. As a result of the study, EPS, the current material was replaced with CFRP and Kevlar, and the structure was changed. This design was judged to satisfy safety regulations against impact. The new helmet structure is expected to improve the helmet usability for personal mobility and increase the helmet wear rate of users.