• 한국지리정보학회지
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• 제20권1호
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• pp.137-151
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• 2017

도시표면의 건물정보는 빗물의 유출경로이며 또한 격자기반의 수치해석을 위한 빗물흐름과 건물 외곽을 구분하는 경계조건에 해당한다. 경계조건인 건물자료의 왜곡 최소화는 수치해석 결과의 사실성 확보를 위한 필수적 과정이다. 격자기반의 래스터 전환은 건물자료의 왜곡을 유발하기 때문에 왜곡의 정도를 완화시키기 위한 전처리로 건물 일반화가 필요하다. 본 연구의 목적은 건물 일반화가 일반주거지역의 빗물 유출경로 연속성에 미치는 영향을 분석하고 적정한 일반화 임계값과 수치해석 격자크기를 제시하고자 한다. 빗물 유출경로 연결성 평가를 위한 설명변수로는 일반화 임계값과 수치계산 격자크기를 사용하는 한편 종속변수로는 격자망의 단절 개수와 단절면적을 사용했다. 적정한 격자크기와 일반화 임계값 선정은 임의 격자크기와 임계값을 적용한 일반화 결과로부터 산출된 건물 면적 변화율과 단절 면적 변화율 각각을 비교하고 크기가 가장 낮은 것으로 하였다. 적정 임계값과 격자크기 범위는 각각 3m와 $5{\times}5m{\sim}10{\times}10m$ 이었다. 이를 적용한 결과 건물면적 증가율은 5%이하 그리고 단절면적 감소율은 94.4%이상이었다. 대상지 토지용도를 구분한 건물 일반화 모의 결과, 아파트 단지인 3종의 건물면적과 빗물 유출경로 연결성은 임계값 10m이하에서 크게 변하지 않았다. 한편 개별 주택인 2종 지역에서는 임계값 3m와 격자크기 $5{\times}5m$을 적용한 모의결과는 단절면적의 감소와 양호한 유출경로 연결성을 보였다.

• 기록학연구
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• 제48호
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• pp.141-179
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• 2016

2011년 5월 '5 18 민주화운동 기록물'이 유네스코 세계기록유산으로 등재되었다. 이는 5 18이 시민운동으로서의 가치를 가진 역사임을 전 세계에 알리게 된 사례라 볼 수 있다. 하지만 이러한 국제적 인정에도 불구하고 5 18에 대한 그릇된 편견과 입장으로 이를 부정하는 기록물은 무시할 수 없을 만큼 도처에 널려 있다. 그들은 자신의 주장을 정당화하기 위해 기록물을 왜곡하면서까지 담론을 형성하고 있었다. 이에 따라 본 연구는 5 18 기록을 왜곡하는 담론의 문제점을 파악하고 이에 대응하기 위한 아키비스트의 기록관리 전략을 제시하는 것으로 주제를 두었다. 또한 본 연구는 아키비스트가 기존에 시행 중인 왜곡 대응에 보다 체계적인 전략을 제시함과 동시에, 아직 왜곡 담론에 휩쓸리지 않은 학생 등을 위주로 이들에게 진실된 기록을 토대로 한 담론을 제공하는 것을 목적으로 하고 있다. 이제 더 이상 아키비스트는 한정된 기록관에서의 정보를 제공하는 소극적 입장이 아닌, 적극적으로 5 18 담론에 대한 긍정적 인식을 심어줄 수 있는 입장이 되도록 노력해야 할 것이다. 따라서 추후 지속적으로 연구될 기록 왜곡 대응 전략 분석에 본 연구가 가치 있을 것이라 기대된다.

• 복식
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• 제54권3호
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• pp.113-127
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• 2004

The purpose of this study is to search the spiritual root of decoration and anti-decoration culture in contemporary Japanese fashion and find the aesthetic meanings of the decoration culture inside contemporary Japanese fashion. The contents of this study are 1. surveying the historical change about the aesthetic sense of Japan. decoration culture 2. deducing the distinctive aesthetic ideology from the decoration culture 3. finding esthetically the inside meaning of 1.2. in contemporary Japanese fashion. First, the origin of decoration culture was concerned with the belief in the life after death of the Buddhism culture to represent the noble society of the Heian(평안) period and the religion of paradise after the Middle Ages. Second. this decoration culture based on two aesthetic ideologies, beautiful(염) aesthetics and lofty(숭고) aesthetics. The beautiful aesthetics implies words, such as bewitchment, elegance, dignity and brilliance which stand for the sensual pleasure and the eroticism. The lofty aesthetics that was introduced by TakeTakasi(장고) during the Heian period, had the meaning of magnificence, greatness and dignity. This could be recognized as the Confucianism ideas. Third, as the beautiful aesthetics that was the representative aesthetic ideology of the decoration culture, it was related to splendid and decorative designs, and was recognized as the beauty of brilliance and coquetry. The beauty of brilliance, as a decorative element, appeared in patterns of the traditional costume and dyeing as well as the beauty of coquetry indicated that the women's fashion in Japan had soft, feminine, and cute images, called Hawaii, by using various decorations, such as feminine details, flower patterns. ruffles. ribbons and so on. TakeTakasi's lofty aesthetics applied the beauty of exaggeration to every art form. It has influenced the form exaggeration by overlapping in traditional costumes as well as the 1970s big look and layered look in Europe fashion. Issey Miyake and Takeda Kenzo introduced the decorative play, such as transformation and a distortion, which considered refinement, bluff, and oddity of the Japanese decoration art.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제13권5호
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• pp.2357-2380
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• 2019

In this paper, we investigate the impact of hardware impairments (HWIs) on the performance of a downlink massive MIMO system. We consider a single-cell system with maximum ratio transmission (MRT) as precoding scheme, and with all the HWIs characteristics such as phase noise, distortion noise, and amplified thermal noise. Based on the system model, we derive closed-form expressions for a typical user data rate under two scenarios: when a common local oscillator (CLO) is used at the base station and when separated oscillators (SLOs) are used. We also derive closed-form expressions for the downlink transmit power required for some desired per-user data rate under each scenario. Compared to the conventional system with ideal transceiver hardware, our results show that impairments of hardware make a finite upper limit on the user's downlink channel capacity; and as the number of base station antennas grows large, it is only the hardware impairments at the users that mainly limit the capacity. Our results also show that SLOs configuration provides higher data rate than CLO at the price of higher power consumption. An approach to minimize the effect of the hardware impairments on the system performance is also proposed in the paper. In our approach, we show that by reducing the cell size, the effect of accumulated phase noise during channel estimation time is minimized and hence the user capacity is increased, and the downlink transmit power is decreased.

• International Journal of Precision Engineering and Manufacturing
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• 제1권1호
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• pp.98-105
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• 2000

The projectors using liquid crystal display(LCD) have faults such as low optical efficiency, low brightness and even heat generation. To solve these problems reflective-type spatial light modulators based on MEMS (Microelectromechanical Systems) technology have emerged. Digital Micromirror DeviceTM(DMDTM), which was already developed by Texas Instruments Inc., and Thin-film Micromirror ArrayTM(TMATM), which has been recently developed by Daewoo Electronics Co., are the representative examples. The display using TMATM has particularly much higher optical efficiency than other projectors. But the micromirrors manufactured by semiconductor processes have inevitable distortion because of the limitations of the manufacturing processes, so that the distortions of their surfaces have great influence on the optical efficiency of the projector. This study investigated the effects of mirror flatness on the optical performance, including the optical efficiency, of the TMATM projector. That is to say, as a part of the efforts to enhance the performance of the TMATM projector, how much influence the form errors of a micromirror surface exert on the optical efficiency and the modulation of gray scale of the projector were analyzed through a pertinent modeling and simulations.

• Structural Engineering and Mechanics
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• 제35권5호
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• pp.571-592
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• 2010

An energy-based fatigue life prediction framework was previously developed by the authors for prediction of axial, bending and shear fatigue life at various stress ratios. The framework for the prediction of fatigue life via energy analysis was based on a new constitutive law, which states the following: the amount of energy required to fracture a material is constant. In the first part of this study, energy expressions that construct the constitutive law are equated in the form of total strain energy and the distortion energy dissipated in a fatigue cycle. The resulting equation is further evaluated to acquire the equivalent stress per cycle using energy based methodologies. The equivalent stress expressions are developed both for biaxial and multiaxial fatigue loads and are used to predict the number of cycles to failure based on previously developed prediction criterion. The equivalent stress expressions developed in this study are further used in a new finite element procedure to predict the fatigue life for two and three dimensional structures. In the second part of this study, a new Quadrilateral fatigue finite element is developed through integration of constitutive law into minimum potential energy formulation. This new QUAD-4 element is capable of simulating biaxial fatigue problems. The final output of this finite element analysis both using equivalent stress approach and using the new QUAD-4 fatigue element, is in the form of number of cycles to failure for each element on a scale in ascending or descending order. Therefore, the new finite element framework can provide the number of cycles to failure at each location in gas turbine engine structural components. In order to obtain experimental data for comparison, an Al6061-T6 plate is tested using a previously developed vibration based testing framework. The finite element analysis is performed for Al6061-T6 aluminum and the results are compared with experimental results.

• 한국실내디자인학회논문집
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• 제14권5호
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• pp.98-105
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• 2005

Through advanced computer technology, our physical environment became a flexible and liquid space that is a multi-functional space structure, hetero-alliance, formless, interactivity. We attempt to interpretate Deleuze's Other geometry as a space designer. Hence first, the aim of this study is to define the meaning of the Other and Other geometry. Second, to extract keywords out of the Other geometry to analyze the work. Third, to analyze the work using the space formative languages(blob, blurring, distortion, folding, layering, lightness, nesting, repetition, shear, transparency, twisting, unfolding, warping, waving, and weaving). The 13 works were selected which have been issued after year 2000 with the focus on liquid space studies. The methods of this study are literature research and contents analysis. The results of the analysis were as follows. First, the source is the Other who is a hidden potentials in the surrounding environment, and this source has the capability of making it part of reality anytime. Other geometry means it is a theory that is comprised of various lines that with the kind of experiences that one has in life. Second, the key words that were extracted from the theory of Deleuze's Other geometry were of (1)hetero-alliance(reflected in a sculptured shape or a fluid abstract form), (2)dis-form(by speculating the user's movements, and combining space elements with external forces), (3)interactivity (information was exchanged real time between the user and his environment where the space took on a sensory institution). Finally, after studying the works using the space formative languages, we found that blob, warping, waving were used externally, and repetition, warping and waving for mostly used internally.

• Journal of Power Electronics
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• 제13권6호
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• pp.939-954
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• 2013

The Direct Torque Control (DTC) technique for Permanent Magnet Synchronous Motors (PMSM) is receiving increased attention due to its simplicity and robust dynamic response when compared with other control techniques. The classical switching table based DTC results in large flux and torque ripples in the motors. Several studies have been reported in the literature on classical DTC. However, there are only limited studies that actually discuss or evaluate the classical DTC. This paper proposes, novel switching table / DTC methods for PMSMs to reduce torque ripples. In this paper, two DTC schemes are proposed. The six sector and twelve sector methodology is considered in DTC scheme I and DTC scheme II, respectively. In both DTC schemes a simple modification is made to the classical DTC structure. The two level inverter available in the classical DTC is eliminated by replacing it with a three level Neutral Point Clamped (NPC) inverter. To further improve the performance of the proposed DTC scheme I, the available 27 voltage vectors are allowed to form different groups of voltage vectors such as Large - Zero (LZ), Medium - Zero (MZ) and Small - Zero (SZ), where as in DTC scheme II, all of the voltage vectors are considered to form a switching table. Based on these groups, a novel switching table is proposed. The proposed DTC schemes are comparatively investigated with the classical DTC and existing literatures through theory analysis and computer simulations. The superiority of the proposed DTC method is also confirmed by experimental results. It can be observed that the proposed techniques can significantly reduces the torque ripples and improves the quality of current waveform when compared with traditional and existing methods.

• Smart Structures and Systems
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• 제20권5호
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• pp.595-605
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• 2017

The present article reported the thermal buckling strength of the sandwich shell panel structure and subsequent improvement of the same by embedding shape memory alloy (SMA) fibre via a general higher-order mathematical model in conjunction with finite element method. The geometrical distortion of the panel structure due to the temperature is included using Green-Lagrange strain-displacement relations. In addition, the material nonlinearity of SMA fibre due to the elevated thermal environment also incorporated in the current analysis through the marching technique. The final form of the equilibrium equation is obtained by minimising the total potential energy functional and solved computationally with the help of an original MATLAB code. The convergence and the accuracy of the developed model are demonstrated by solving similar kind of published numerical examples including the necessary input parameter. After the necessary establishment of the newly developed numerical solution, the model is extended further to examine the effect of the different structural parameters (side-to-thickness ratios, curvature ratios, core-to-face thickness ratios, volume fractions of SMA fibre and end conditions) on the buckling strength of the SMA embedded sandwich composite shell panel including the different geometrical configurations.

• 한국가정과학회지
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• 제9권4호
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• pp.27-39
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• 2006

Surrealism, appeared in the beginning of the 20th century and affected almost all art fields, is one of the most representative art trends. Surrealism, not restricted from any rules and traditions but tried to produce a new appreciations in the world of dream and unconsciousness, also has affected fashion. In this paper, I have tried to find out how the surrealism has been expressed in the modern fashion, especially in Thierry Mugller's design. Thierry Mugler is one of the most famous designers who have expressed surrealism in their fashion designs. I have classified his designs and researched them by the application into the human body and the nature, by the metaphor and transformation of things, and by the metamorphosis of location and an optical illusion. It was based on Depaysement which is one of the ways in surrealistic expressions. The result of the study is followings; First, surrealism made fashion design possible to creat unlimitedly and sublimated it anew modern beauty by attempting the varieties of the fashion, not restricted from any rules and traditions. Second, surrealism made the general public to complete anew recognition and valuation about fashion by expressing the external character and the internal meaning on the clothes. Third, surrealism made people to recognize, which clothes is not simply wearing thing but also one of the art expression forms.