• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.32 no.2
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• pp.31-37
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• 2004

• Wind and Structures
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• v.5 no.2_3_4
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• pp.83-88
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• 2002

The present situation of CWE(Computational Wind Engineering) and the papers presented to the CWE 2000 Symposium are reviewed from the following viewpoints; 1) topics treated, 2) utilization of commercial code (software), 3) incompleteness of CWE, 4) remaining research subjects, 5) prediction accuracy, 6) new fields of CWE application, etc. Firstly, new tendencies within CWE applications are indicated. Next, the over-attention being given to the application field and the lack of attention to fundamental problems, including prediction error analysis, are pointed out. Lastly, the future trends of CFD (Computational Fluid Dynamics) applications to wind engineering design are discussed.

• 제어로봇시스템학회:학술대회논문집
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• 1994.10a
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• pp.543-547
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• 1994

In this paper, the new approach and technique are introduced and derived from the original Lyapunov direct method which is used to decide the stability of system conveniently. This proposed technique modifies the formal concepts of the sufficient conditions of Lyapunov stability and is able to generate the methods for the robust design of control systems. Also, it applies to the dynamic systems with bounded perturbations and the results of the computer program using the new concept are compared with those of previous research papers and conventional Lyapunov direct method. It is possible to recognize the practical improvements of the estimation of robustness bounds of the systems.

• 제어로봇시스템학회:학술대회논문집
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• 2000.10a
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• pp.384-384
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• 2000

In adaptive neuro-control, neural networks are used to approximate the unknown plant nonlinearities. Until now, most of the papers in the field of controller design fur nonlinear system using neural networks considers the affine system with fixed number of neurons. This paper considers nonaffne nonlinear systems and dynamic variation of the number of neurons. Control laws and adaptive laws for weights are established so that the whole system is stable in the sense of Lyapunov.

• ETRI Journal
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• v.32 no.1
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• pp.154-156
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• 2010

Oscillation-based testing of analog-to-digital converters represents a viable option for low-cost built-in self-testing in mixed-signal design. While numerous papers have addressed implementation issues, little attention has been paid to the measurement accuracy. In this letter, we highlight an inherent measurement uncertainty which has to be considered when deriving the parameters from the oscillation frequency.

• Proceedings of the Korean Geotechical Society Conference
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• 2002.10a
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• pp.55-64
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• 2002

This paper presents a brief review of flexible retaining structure and the most significant methods developed to predict their behavior on underground excavations. Some observations are made about the future directions that the design of retaining systems may take , as there are still some problems where uncertainity exists, in soil-structure interaction and evaluation of strength parameters etc. And also reviewed papers presented in 2002 Fall National Conference of KGS.

• Journal of the Korean Society for Precision Engineering
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• v.16 no.2 s.95
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• pp.87-94
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• 1999

The automated die design program is developed for cold forging of axisymmetric parts which are mainly produced by forward extrusion, backward extrusion, composite extrusion and upsetting. For this study, firstly classification of forged parts and investigation of die construction type usually employed in forging industry are carried out and the most proper type from several kinds of die construction is proposed as a standardized one. Based on the die design rules summarized in the references such as handbooks, technical papers, monthly journals, etc. the automated die design program was made using AutoLISP language available in AutoCAD software of personal computer. This program interactively runs for only input data, for example, forging process, shape of forged parts, type of punch, split of die insert and design of shrinkage rings and then displays details of drawings necessary to make a forging die. When a variety of forging processes and forged parts are tested to examine the validity of this program, it was confirmed to give good results applicable to the forging die design in press shop.

• Journal of the Korea Furniture Society
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• v.18 no.1
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• pp.31-38
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• 2007

The most important issue of today in design genre is the comprehensive design that overcomes the limitations of the rational and logical designs of functionalism that has had influences in entire 20th century and encompasses even the emotional aspect of humans. The emotional design factors in furniture designs will be analyzed in order to analyze their effects and values on the consumers of present times. The emotional uses of the patterns with the motive of nature expressing papers, flowers, wood textures, natural phenomena etc as they are and the colors with the vivid feeling of primary colors represent more dynamic and cheerful life style and the designs are characterized by the warm primary colors that give the feeling that the nature has been transferred to the designs as it is. Diverse materials such as leather, fur, fabric and the materials with soft and flexible feeling such as silicone material have been used more widely and they are used as the materials expressing freedom not being formalized. The designs that can produce diverse spaces desired by users by gathering unit modules can be said to be the outcome of the emotional designs combined with the needs of modern peoples that aspire their own designs.

• International Journal of Ocean Engineering and Technology Speciallssue:Selected Papers
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• v.6 no.1
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• pp.60-68
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• 2003

This paper proposes an optimum design method of structural and control systems, using a 2-D truss structure as an example. The structure is subjected to initial static loads and disturbances. For the structure, a FEM model is formed. Using modal transformation, the equation of motion is transformed into modal coordinates, in order to decrease D.O.F. of the FEM model. To suppress the effect of the disturbances, the structure is controlled by an output feedback $H_{\infty}$ controller. The design variables of the combined optimal design of the control-structure systems are the cross sectional areas of truss members. The structural objective function is the structural weight. The control objective function is the $H_{\infty}$ norm, the performance index of control. The second structural objective function is the energy of the response related to the initial state, which is derived from the time integration of the quadratic form of the state in the closed-loop system. In a numerical example, simulations have been perform. Through the consideration of structural weight and $H_{\infty}$ norm, an advantage of the combined optimum design of structural and control systems is shown. Moreover, since the performance index of control is almost nearly optimiz, we can acquire better design of structural strength.

• Journal of the Korea Fashion and Costume Design Association
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• v.9 no.3
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• pp.99-113
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• 2007

This study aims to investigate the concepts and characteristics of Metrosexual and Ubersexual image which are the recent fashion phenomena representing the lifestyles of comtemporary men, and to analyze the design of contemporary men's fashion based on the represented characteristics of these sexual images. To accomplish these ends, various related publications, articles and papers, divers serial publications, and numerous internet articles are collectively reviewed for theoretical studies, and design analysis are conducted for content analysis(style, color, material, detail, etc) using photo data taken from the collections from 2001 through 2006. The results of this study shows that recent appearance of Metrosexual and Ubersexual fashion image represents the change of aesthetic standards in the contemporary society. With the influence of sociocultural phenomena which allow the pursuit of individual personality, the contemporary men, instead of expressing the socialized sexual identity, came to acquire the freedom of sexual identity which represents their personal desires. As an expression of hmnan will to pursue unrestricted sensibility and aesthetic sense, these sexual phenomena of Metrosexual and Ubersexual will be reinterpreted and reappear in various forms as the social atmosphere and aesthetic standards changes.