• Proceedings of the Korean Society For Composite Materials Conference
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• 2002.05a
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• pp.127-130
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• 2002

Vibration analysis of rotating blade is the main purpose of the present study. In this study, general formulation is performed for rotating shell structures including the centrifugal force, Coriolis acceleration and initial twist. Furthermore, simplified equations are derived for the case of an open cylindrical shell. Based on the concept of degenerated shell element with the Reisser-Mindlin's assumptions, the finite element method is adopted for solving the problems. In addition, it is investigated the effect of the stacking sequence of the composites on the vibration characteristics of the blade. The results are summarized for the various parameters such as the speed of rotation and pre-twist of the blade. Also, present results are compared with the previous works and experimental data.

• Proceedings of the Korean Information Science Society Conference
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• 2006.10c
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• pp.83-87
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• 2006

Similarity search in moving object trajectories is an active area of research. In this paper, we introduce a new concept of measure that computes spatial distance (similarity) between two trajectories of moving objects on road networks. In addition, we propose an algorithm that generates a sequence of matching edge pairs for two trajectories that ate to be compared and computes spatial distance between them which is non Euclidian in nature. With an example, we explain how our algorithm works to show spatial similarity between trajectories of moving objects in spatial network.

• Korean Institute of Interior Design Journal
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• v.20 no.3
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• pp.152-160
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• 2011

Contemporary architecture pursues new method of Interpretation of Non-linear space as digital media appears. As various materials and new methods can be used due to developments in science and expansion of thinking, contemporary architectural color developed extensive possibilities. It means not only the change of drawings, method of architectural product and materials but also the change of value system for architectural space. Thus the purpose of this paper is to suggest interpretation of space applied by color structure, and this point of view was based on the three elements of color perception which are light source, reflector, and observer. According to this categorization, architectural color of exterior color, layer color and interaction color are explained via examples of colors recently used on the contemporary architectures. In summary, contemporary architecture can be explained by Non-construction space interpretation for intrinsic complex meanings. Therefore, it can be explained as moving space, collage, by picturesque space, moving blur color and emptiness of color. This pursues various point of views for space interpretation, therefore it can be developed to the identity of strengthening architectures' design concept.

• Korean Journal of Mathematics
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• v.20 no.2
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• pp.161-176
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• 2012

The authors [6] introduced the concept of a complete matrix of grade $g$ > 3 to describe a structure theorem for complete intersections of grade $g$ > 3. We show that a complete matrix can be used to construct the Eagon-Northcott complex [7]. Moreover, we prove that it is the minimal free resolution $\mathbb{F}$ of a class of determinantal ideals of $n{\times}(n+2)$ matrices $X=(x_{ij})$ such that entries of each row of $X=(x_{ij})$ form a regular sequence and the second differential map of $\mathbb{F}$ is a matrix $f$ defined by the complete matrices of grade $n+2$.

• Proceedings of the KIPE Conference
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• 2001.12a
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• pp.181-184
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• 2001

In this paper, a novel overmodulation strategy for space-vector PWM(SVPWM) inverters to utilize dc link voltage fully is presented. The proposed strategy uses the concept of SVPWM based on the zero sequence signal(offset voltage) injection principle. So, by modifying the pole voltage simply, the linear control of inverter output voltage over the whole overmodulation range can be achieved easily. The validity of the proposed strategy is confirmed by the experimental results.

• Korean Institute of Interior Design Journal
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• no.19
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• pp.136-143
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• 1999

Art belongs to men's mentality and plays the most representative role in mentality. The organization of mentality is complex, it has simple and distinct movement evolving into various configuration to achieve men's internal meaning and aim. The purpose of this study is to analyze Max Bill's characteristics of the spatial expression on his works, especially focuses on the concept called "simplicity". The simplicity does not means just a conceptual or formal terminology, but the logical principles of spatial organization through repeating arrangement, structural relationship, off-central ideas and the sequence of signs using by the composition of lines, faces and colors. He expressed the logical methods in various fields of art and has influenced his essential thoughts and emotion in men's mentality of the late 20th century20th century.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2002.11b
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• pp.810-815
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• 2002

Vibration analysis of rotating blade is the main purpose of this study. In the present work, general formulation is proposed to analyze the rotating shell-type structures including the effect of centrifugal force, Coriolis acceleration and initial twist. Furthermore, simplified equations are derived for the case of an open circular cylindrical shell. Based on the concept of degenerated shell element with the Reissner-Mindlin's assumptions, the finite element method is adopted for solving the governing equations. In addition, it is investigated the effect of thermal load on the vibration characteristics of pretwisted blade. Numerical results are summarized for the various parameters such as rotating speed, angle of pretwist and stacking sequence of a composite blade. Also, present results are compared with the previous works and experimental data.

• Proceedings of the Korean Operations and Management Science Society Conference
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• 2006.05a
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• pp.1198-1206
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• 2006

프로그램 소스코드 표절 검사에 대한 기존 방법은 크게 지문(finger-print)법과 구조기반 검사법으로 나뉘며, 주로 단어의 유사성이나 발생빈도를 사용하거나 소스코드 구조상의 특징으로 두 소스간의 유사성을 비교한다. 본 연구에서는 프로그래밍 언어의 예약어 시퀀스를 사용하여 소스코드들 간의 유사성을 비교하고, 이 결과를 FCA(Formal Concept Analysis)를 통해 해석하고 시각화 하는 방법을 제시한다. 일반적인 VSM(Vector Space Model)과 같은 단일 단어 분석으로는 단어의 인접성을 구분할 수 없으므로 단어의 시퀀스 분석이 가능하도록 알고리즘을 구성하였으며 이러한 방식은 지문법의 단점인 소스코드의 부분적인 표절 탐지의 난점을 해결할 수 있고 함수의 호출 순서나 수행 순서에 상관없이 표절을 탐지할 수 있는 장점을 가진다. 마지막으로 유사도 측정결과는 FCA를 이용하여 격자(lattice)로 시각화됨으로써 이용자의 이해도를 높일 수 있다.

• Proceedings of the Korean Institute of Interior Design Conference
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• 2007.05a
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• pp.77-78
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• 2007

This project has been designed for people to experience and understand the process, importance and benefit of coal fire plants. As the biggest and first typical Korean fire plant using coal, Boryeong fire plant has had important roll for the Korean industries. Even so, people has had wrong prejudice for the fire plant in terms of environmental protection. To do these kind of rolls, this museum has been designed with theme, "Boryeong fire plant mating symbiotic relationship between nature, human and technologies." The space was zoned with five major themes: i. circulation of energy in nature, ii. electric power and eco-fire plant, iii. future energy, iv roll for future of environment, v. Korea as the leading energy industry. The design has been developed focused on spatial experiences to make 'Design Sequence' with linear circulations haying several important destinations. The interior has been finished with minimal color and materials projected by big sized movie and various LED movie system. Concept of appordance has been used to make interactive experiences between exhibits and visitors.

• Journal of the Korean Society of Systems Engineering
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• v.11 no.2
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• pp.75-83
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• 2015

This paper describes modeling & simulation(M&S) model for dynamic analysis of helicopter rotor blades. Simulation model is developed using Dymola tool which implements the open source language - Modelica. Modelica is appropriate for developing multibody dynamic analysis model. To develop an M&S model efficiently, model based systems engineering(MBSE) is applied. Some diagrams such as requirement diagram, block definition diagram and sequence diagram etc. are drawn to capture the concept of M&S model. This activity is done utilizing the open source tool - Papyrus.