• 한국실내디자인학회논문집
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• 제22권6호
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• pp.130-139
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• 2013

The purpose of this study is to analyze the characteristics of Korean sofa design in 2013 and understand the change of it in comparison with the characteristics of sofa in 2001. For the sake of it, this study analyzed the styles, forms, materials, colors and composition of 220 sofas posted on 7 main furniture companies' internet homepage of Korea, and used the results of the previous study for the materials in 2001. As the results of analysis, the style of furniture was almost modern and there was much of lineal in the form of sofa, rather than curved. The percentage of using leather for main material of sofa was greatly increased compared with 2001. In case of minor material, there was difference in each company in percentage of using wood and metal. The use of brown color was greatly increased compared with 2001, and the diversification of color use was reduced. The percentage of using a single color gets increased compared with 2001, but the cases of strong contrast were more than that of weak contrast. The percentage of sofa for 3 people gets lowered compared with 2001, and the case of sofa for 4 people gets greatly increased. In case of auxiliary component, the use of couch and stool, which were almost not used in 2001, gets more increased than sofa for single, with many cases of using the corner, though small. In conclusion, the characteristics of Korean sofa design are diversification of the sofa configuration, the tendency of high-quality sofa, and simplification and concentration of the sofa design.

• 한국의상디자인학회지
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• 제23권3호
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• pp.23-42
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• 2021

The purpose of this study is to analyze the characteristics of the Chinese Miao people's Batik patterns and provide data in the field of fashion design for the utilization of the traditional patterns. This study investigated and analyzed the regional characteristics of Batik dyeing, which was listed on China's national intangible cultural heritage list; Danzhai, Anshun, Huangping, and Gonghyeon. The expressive characteristics were classified into four categories: symbolism, abstraction, decorativeness, and playfulness. The results are as follows. First, symbolism can be classified into the origins of the Miao, symbols of faith, history of migration, and the symbols of status with Batik patterns from different regions, seemingly involving various symbolic implications. Due to the absence of letters, Miao people expressed their emotions and history in the design patterns. A series of developments in recent years has led to incorporating the temperament of the Miao people, history of migration, expression of emotions, and ideal hopes in Batik dyed design patterns and the symbolic functions have been significantly emphasized. Second, the decorativeness is mainly characterized by repeated patterns of the Miao Batik dyeing design. The overall patterns demonstrate design features characterized by regularization and simplification, along with a sense of rhythm with the unique arrangement of patterns. Third, the abstractness of the Batik dyeing design patterns is often found in plant and animal patterns, properly delivering new designs created by Miao women by extracting and rearranging various elements, including dots, lines, and faces shown in natural images. Fourth, playfulness is expressed by the transformation and distortion of Miao Batik patterns, and were created by applying patterns or other elements to original forms to express animal or plant patterns in a playful way.

• 한국기계가공학회지
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• 제9권5호
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• pp.83-89
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• 2010

In this paper, the dynamic response of a CNC 5 Axles machining center was analyzed and then controlled passively by using the dynamic absorber. For the simplification of the theoretical approach, the CNC 5 Axles machining center was modeled as a flexible beam(Bed) having a point mass(Column), two discrete systems(a Table-set and a dynamic absorber). Specifically by using the dynamic absorber, the dynamic response of a Table-set which be caused by the vibration of a flexible beam, was reduced down to the infinitesimal level. The optimal design factors of the dynamic absorber were obtained from the minimization of the cost function. It was found that the natural frequencies of a UT-380 machining center be varied due to the movement of the Table-set. In view of the dynamic response of a Table-set, the larger spring stiffness and mass of the dynamic absorber were found to give the greater reduction.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 1996년도 Proceedings of the Korea Automatic Control Conference, 11th (KACC); Pohang, Korea; 24-26 Oct. 1996
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• pp.401-404
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• 1996

A new method for the electrostatic suspension of disk-shaped objects is proposed which is based on a switched-voltage control scheme. It operates according to a relay feedback control and deploys only a single high-voltage power supply capable of delivering a dc voltage of positive and/or negative polarity. In addition to the unique feature that no high-voltage amplifiers are needed, this method provides a remarkable system simplification relative to conventional methods. It is shown that despite the inherent limit cycle property of relay feedback based control, an excellent performance in vibration suppression is attained due to the presence of a relatively large squeeze film damping. In this paper, the functional principle of the switched voltage control scheme, numerical analysis, stator electrode design, and a nonlinear dynamic model of the suspension system are described. Experimental results will be presented for a 4-inch silicon wafer that clearly reveal the capability of the proposed control structure to suspend the wafer stably at an airgap length of 50 .mu.m.

• 대한조선학회논문집
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• 제45권2호
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• pp.213-220
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• 2008

The aim of this paper is to build up the design model using ASMOD(Adaptive Spline Modeling of Observation Data) for the optimum scale of fleet, ship particulars and ship speed, etc. ASMOD, which define membership functions of fuzzy rule as B-spline basis function, represents a whole system as the sum of the sub-model. As it reduces the number of division of the space generated by the fuzzy set of input variables, it has a advantage of simplification to model structure and is efficient to represent the non-linear model.

• 대한의용생체공학회:의공학회지
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• 제5권1호
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• pp.77-84
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• 1984

A prototype of a linear real-time ultrasound B-scanner has been developed which has an axial resolution of 1-2mm and lateral resolution of 2-3mm. In the actual hardware and software implementations of the B-scanner, the following features were emphasized; (1) a dynamic focusing to improve resolution; (2) signal processing to obtain low noise image; (3) various functions for the user's convenience' (4) simplification of the system by an extensive use of recently developed LSI's; (5) development of a prototype at the level of a commercial product. This paper reports the experimental results of the overall system and the design approach of the analog part. The work on the digital part of the B-scanner is reported in part (II) seperately.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2006년도 춘계학술발표회 논문집(I)
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• pp.526-529
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• 2006

In this paper, flexure behavior of steel fiber reinforcement ultra high performance cementations composites (SFR-UHPCC) has been analyzed by equivalent stress block. Pulling-out tensile force of steel fiber with concrete matrix was induced. An appropriate flexure evaluation formula, i.e. semi-analytical formula, was established based on rectangular cross section beam for comparing with shear capacity and ultimate load of SFR-UHPCC beam. Finally, the semi-analytical formula has been simplified for the convenience of design work. Experimental results and theoretical shear strength are shown to compare with the formula proposed by this paper. The theory formula has a good prediction of failure type of SFR-UHPCC.

• 한국전산구조공학회:학술대회논문집
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• 한국전산구조공학회 1998년도 가을 학술발표회 논문집
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• pp.77-83
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• 1998

The most of the design engineers for construction has academic background of bachelors degree. Theories for advanced composite structures are too difficult for such engineers and some simple but accurate enough methods are necessary. The senior author has reported that some laminate orientations have decreasing values of B$_{16}$, B$_{26}$, D$_{26}$, and D$_{26}$ stiffnesses as the ply number increases. Such plates above behave as special orthotropic plates and simple formulas developed by the senior author［1, 3］ can be used. Most of the bridge and building slabs on girders have large aspect ratios. For such cases further simplification is possible by neglecting the effect of the longitudinal moment terms(M$_{x}$) on the relevant partial differential equations of equilibrium. In this paper, the result of the study on the subject problem is presented.ted.d.

• Ocean Systems Engineering
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• 제2권4호
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• pp.239-255
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• 2012

Analysis of ship parametric roll has generally been restricted to simple analytical models and sophisticated time domain simulations. Simple analytical models do not capture all the critical dynamics while time-domain simulations are often time consuming to implement. The model presented in this paper captures the essential dynamics of the system without over simplification. This work incorporates various important aspects of the system and assesses the significance of including or ignoring these aspects. Special consideration is given to the fact that a hull form asymmetric about the design waterline would not lead to a perfectly harmonic variation in metacentric height. Many of the previous works on parametric roll make the assumption of linearized and harmonic behaviour of the time-varying restoring arm or metacentric height. This assumption enables modelling the roll motion as a Mathieu equation. This paper provides a critical assessment of this assumption and suggests modelling the roll motion as a Hills equation. Also the effects of non-linear damping are included to evaluate its effect on the bounded parametric roll amplitude in a simplified manner.

• 한국정밀공학회지
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• 제23권3호
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• pp.132-138
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• 2006

With a great requirement of innovation caused by severe competition current companies are encouraged to improve bottleneck areas in production procedure. Specially a chassis line in which assembly processes are mainly carried out manually has the large potential to be automated. The putting of spare tire in trunk in chassis line is still dominated by free dropping method. Through that, parts in trunk such as luggage room lamp, jack and so on were damaged and the complaint of assembler in the next process was occurred due to physical strength. To eliminate these, tile robot system was in this paper developed to place spare tire on the mounting hole in trunk. The movement of robot was synchronized with the velocity of chassis hanger. With this automated system the productivity of the chassis line was increased from the benefits such as simplification of the system using only robot without the mechanically synchronized transport, inserting spare tire into the right position with robot, reduction of damaged parts and production of various type of car.