• 대한전자공학회논문지TC
• /
• 제43권8호
• /
• pp.59-68
• /
• 2006

채널 부호의 균일 오율에 대한 연구는 부가성백색가우시안 채널에 대해 국한되어 연구되어 왔으며, 기하학적 균일성으로 불려왔다. 본 논문에서는 전송 채널과 수신기를 완전히 묘사해주는 확률밀도함수를 직접 다루어 균일 오율 특성을 다중 송수신안테나가 사용되는 시공간 부호로 확장한다. 또한 빠른 페이딩 채널에서 곱거리 스펙트럼를 고려한 기하학적 균일 시공간 부호 설계 과정을 보여준다. 균일 오율 특성으로 부호 검색의 복잡도가 현격히 감소하고, 이런 복잡도 감소는 높은 상태 수를 갖는 시공간 격사상 부호에 대해서도 최적의 부호 검색을 가능하게 한다. 모의 실험을 통해 새로 설계된 부호가 다른 알려진 부호들에 비해 빠른 페이딩 채널에서 더 좋은 성능을 가지는 것을 확인한다.

• 대한가정학회지
• /
• 제41권10호
• /
• pp.45-55
• /
• 2003

This study was performed to find ways to improve the wearing comfort of high school boys' summer uniforms. The subjects were 640 boy students of high schools in Cheongju and Ansung city. The data was collected self-administered questionnaires to measure the actual wearing condition and the wearing satisfaction. Factor analysis, t-test, and F-test were used for data analysis. The results were as fellows: 1) Most students were wearing shirts made of polyester/rayon blended fabrics and pants made of wool/polyester blended fabrics. 2) Most students were wearing round neckline T-shirts or running shirts as underwears of the shirts, and trunks as pants. 3) About a half of respondents had altered their summer uniforms, and main alteration of their uniforms was focused on making their pants narrow. 4) The wearing satisfaction of uniforms were classifies into three factors: aesthetic, moving function, thermal comfort wearing sensation. 5) They evaluated the wearing sensation of school uniforms of shirts and pants with low satisfaction. 6) There were partially significant differences in three factors of the wearing satisfaction according to the uniform's fabrics, the wearing of underwear and the alteration of uniform.

• Advances in Computational Design
• /
• 제5권2호
• /
• pp.111-125
• /
• 2020

The flow behavior of polymer melts within a slit die is an important consideration when designing a die geometry. The quality of the extruded polymer product can be determined through an evaluation of the flow homogeneity, wall shear rate and pressure drop across the central height of the die. However, mathematical formulations cannot fully determine the behavior of the flow due to the complex nature of fluid dynamics and the nonlinear physical properties of the polymer melts. This paper examines two slit die geometries in terms of outlet velocity uniformity, shear rate uniformity at the walls and pressure drop by using the licensed computational fluid dynamics package, Ansys POLYFLOW, based on the finite element method. The Carreau-Yasuda viscosity model was used for the rheological properties of the polypropylene. Comparative analysis of the simulation results will conclude that the modified die design performs better in all three aspects providing uniform exit velocity, uniform wall shear rates, and lower pressure drop.

• Journal of Electrical Engineering and Technology
• /
• 제6권4호
• /
• pp.513-518
• /
• 2011

In this paper, a unified design environment is developed for the optimization of electric machines based on continuum sensitivity. For electromagnetic (EM) system analysis, COMSOL scripting environment is used. Optimization module is developed by MATLAB programming, which can be combined with COMSOL script commands. The modules are combined into one MATLAB project, and iteration process necessary for the optimization of EM system can be performed efficiently. During the design process, visual feedback of the current design status is given to the designer. In addition, the B-Spline parametrization of the nodal points is implemented to obtain smooth boundary of the device. The developed software is applied to the problem of finding uniform flux density distribution at the air gap of an electromagnet to verify its feasibility and effectiveness.

• 한국추진공학회:학술대회논문집
• /
• 한국추진공학회 2008년 영문 학술대회
• /
• pp.469-475
• /
• 2008

The design of a scramjet inlet is a process to search global optimization results among those factors influencing the geometry of scramjet in their ranges for some requirements. An optimization algorithm of hybrid genetic algorithm based on genetic algorithm and simplex algorithm was established for this purpose. With the sample provided by a uniform method, the compressive angles which also are wedge angles of the inlet were chosen as the inlet design variables, and the drag coefficient, total pressure recovery coefficient, pressure rising ratio and the combination of these three variables are designed specifically as different optimization objects. The contrasts of these four optimization results show that the hybrid genetic algorithm developed in this paper can capably implement the optimization process effectively for the inlet design and demonstrate some good adaptability.

• 한국정밀공학회지
• /
• 제32권10호
• /
• pp.897-902
• /
• 2015

This study reports on a uniform resin coating method by using a doctor blade type dispenser. For high productivity, continuous imprint-lithography has been studied, and developed fabrication systems are used in several applications such as anti-reflection films, dry adhesives, and water collecting surfaces. In the continuous fabrication field, researchers have typically focused on patterning and demolding procedures. During the roll-to-roll fabrication process, however, the uniform resin coating process is also important in order to obtain a high quality product, which can be evaluated by uniform thickness, precise geometric expressions, and a thin residual layer. To achieve these, a doctor blade type dispenser was designed and fabricated. As a result, thickness of coated resin was well controlled by modulating the flow rate of the resin and blading gap. In addition, a very thin layer coating process (${\sim}10{\mu}m$) was achieved by softly contacting the blade on the substrate.

• 한국의류산업학회지
• /
• 제13권4호
• /
• pp.478-486
• /
• 2011

This study is to analyze the symbolic images appeared in modern fashion design adopted dualistic meanings in uniforms. Uniforms signify order, conformity and discipline in public life. The dualistic meanings in uniforms appeared modern times are as follows: public authority vs individual non-authority, heterosexual identity vs homosexual identity, time-space uniformity vs mixed diversity. The symbolic images appeared in modern fashion design adopted dualistic meanings in uniforms such as military uniforms, school uniforms, nurses' uniforms, sports uniforms and etc. are erotic image, hybrid image, and kitsch image.

• International Journal of Naval Architecture and Ocean Engineering
• /
• 제12권1호
• /
• pp.325-342
• /
• 2020

The current study is focused on the evaluation of the ultimate strength of stiffened panels found in ship hull structures that are subjected to combined uniaxial thrust, in-plane and out-of-plane bending moments. This loading condition, which is in general ignored when performing buckling checks, applies to representative control geometries (stiffener with attached plating) as a consequence of the linearly varying normal stresses along the ship's depth induced by the hull-girder vertical bending moment. The problem is generalized by introducing a non-uniform thrust described by a displacement ratio and rotation angle and by introducing the slenderness ratios, within the practical range of interest. The formed design space is explored through methods sourcing from Design of Experiments and by applying non-linear finite element procedures. Surrogate empirical models have been constructed through regression analysis and Response Surface Methods. An additional empirical model is provided to the literature for predicting the ultimate strength under uniaxial thrust. The numerical experimentation has shown that is a significant influence on the ultimate strength of stiffened panels as the thrust non-uniformity increases.

• 교육녹색환경연구
• /
• 제5권2호
• /
• pp.1-13
• /
• 2006

The purpose of this study is to clarify the actual conditions of spatial composition of educational facilities by design process model. This article discuses about the characteristics of the floor plan composition and the site plan patterns of 49 middle and high schools in gyeongnam province. The results of this study are summarized as follows; 1) Comparing to traditional middle and high school facilities, it occurs various types of plane and the area is somewhat expanded in the school with same class size, however, it needs to improve facility standards in its reality to deal with the change of future educational environment actively. 2) Spatial composition of educational facilities should functionally designed considering that the characteristics of design process model. In facilities arrangement of middle and high schools, it shows diverse forms of arrangement from existing uniform straight type, however, most of schools do not being against the simple in their external space. Therefore, it requires an expansion of space siæ and facilities for the change of school life outside class.

• 복식
• /
• 제61권4호
• /
• pp.1-13
• /
• 2011

The purpose of this research is to find out more usages in today's fashion industry where various designs and changes of production required. And this research will also suggest new products and new directions to enhance the efficiency of product planning and production in knit industry using SDS-ONE program. Ethiopia in East Africa, knit already has been used as a school uniform. There is a big difference in temperature spread due to. Knit is a proper item to initiate the textile industries of underdeveloped countries. So this research can develop knit industry and lead the trend of introducing fashion in school uniforms. In this research, we use Paint of SDS-ONE to transform the patterned item into color jacquard, and show it on the designed clothes using simulation. It is shown that body painting pattern is suitable conditions for knit jacquard and simplified pattern can be applied as an excellent knit. And it is discovered the simulation feature of SDS-ONE program has a high efficiency and can be used effectively in African textile industry the future mass production base; SDS-ONE simulation can show various patterns and colors with constrained kinds of threads. Since the body painting designs can be applied in various fields, and from women's wear to men's wear, without limitation, we can take advantage of the broad.