• 한국정보전자통신기술학회논문지
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• 제11권4호
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• pp.319-324
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• 2018

본 논문에서는 ISO/IEC 10646과 멀티바이트 코드 세트간의 변환 시스템을 설계하고 구현한다. 65,000 문자의 코드를 제공하는 UCS 세트는 128 문자의 코드 용량을 제공하는 ASCII 코드의 제한성을 해결하고, 전세계 언어의 표현, 전송, 교환, 처리, 저장 및 입출력을 단일 코드 페이지에서 적용하며, 다국어 소프트웨어 개발시 코드 변환을 단순화시킴으로써 프로그램의 코드 수정을 위한 시간과 비용을 효율적으로 절감하게 한다. 따라서 UCS 코드 시스템과 ASCII 및 EBCDIC 코드 시스템들이 혼용되어 사용되는 환경에서는 상호 시스템간의 코드 변환 방법은 시스템 마이그레이션시 제공되어야 하는 중요한 고려 사항이다. 본 논문의 코드 변환 유틸리티는 UCS와 IBM 호스트 코드간의 매핑 테이블을 포함하고 있으며 제안된 코드 변환 알고리즘을 시스템에서 구현하였다. 제안된 코드 변환 프로그램은 실제 시스템 환경에서 성공적으로 구동하였음을 검증하였고, UCS와 멀티바이트 코드 시스템간의 마이그레이션시 가이드라인으로 제공될 수 있다.

• 전기학회논문지
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• 제66권4호
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• pp.659-665
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• 2017

Power semiconductor devices required the low on-resistance and high breakdown voltage. Wide band-gap materials opened a new technology of the power devices which promised a thin drift layer at an identical breakdown voltage. The diamond had the wide band-gap of 5.5 eV which induced the low power loss, high breakdown capability, low intrinsic carrier generation, and high operation temperature. We investigated the p-type pseudo-vertical diamond Schottky barrier diodes using a numerical simulation. The impact ionization rate was material to calculating the breakdown voltage. We revised the impact ionization rate of the diamond for adjusting the parallel-plane breakdown field at 10 MV/cm. Effects of the field plate on the breakdown voltage was also analyzed. A conventional diamond Schottky barrier diode without field plate exhibited the high forward current of 0.52 A/mm and low on-resistance of $1.71{\Omega}-mm$ at the forward voltage of 2 V. The simulated breakdown field of the conventional device was 13.3 MV/cm. The breakdown voltage of the conventional device and proposed devices with the $SiO_2$ passivation layer, anode field plate (AFP), and cathode field plate (CFP) was 680, 810, 810, and 1020 V, respectively. The AFP cannot alleviate the concentration of the electric field at the cathode edge. The CFP increased the breakdown voltage with evidences of the electric field and potential. However, we should consider the dielectric breakdown because the ideal breakdown field of the diamond is higher than that of the $SiO_2$, which is widely used as the passivation layer. The real breakdown voltage of the device with CFP decreased from 1020 to 565 V due to the dielectric breakdown.

• 복식
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• 제60권5호
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• pp.117-127
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• 2010

In this study, hyperspace is a result of imagination created by means of facts and fiction, represents a transfer to determination and indetermination, and means an extension to an open form. In other words, hyperspace is a high dimensional space expanded to imagination through the combination of the viewpoint on facts in this dimension and fiction. When the 2D plane surface or 3D symmetry is destroyed, or when the frame is twisted or entangled, the non-Euclidean geometry is created eventually. And when the twisting leads to transmutation and the destruction of the form reaches the extreme; this in turn became the twisting like Mbius band. Likewise, the non-Euclidean geometry is co-related to the asymmetry of the Higgs mechanism. When the 'destruction of symmetry' is considered, symmetric theory and asymmetric world can be connected. The asymmetry in turn can maintain balance by arranging the uneven weights at different distances from the shaft. Moreover, at this the concept of the upper, lower, left and right, which was included in the original form, may be crumbled down. The destruction of the symmetry is essential in order to present forecast that coincides with the phenomenon of the real world. Non-Euclidean geometry characteristic is expressed by asymmetry, twists, and deconstruction and its representative characteristic is ambiguity. The boundary between the front, back, upper, lower, inner and outer is unclear, and it is difficult and vague to pinpoint specific location. The design that does not clearly define or determine the direction of wearing costume is indeed the non-oriented design that can be worn without getting restricted by specific direction such as front and back. Non-Euclidean geometry characteristic of hyperspace have been applied to create new shapes through the modification of the substance from traditional clothing of the eastern world to modern fashion. The way of thinking in the 'hyperspace' that used to be expressed in the costumes of the east and the west in the past became the forum for unlimited creation.

• Steel and Composite Structures
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• 제23권2호
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• pp.195-204
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• 2017

The effects of plaster on the behavior of single-story single-bay masonry-infilled steel frames under in-plane base accelerations have been experimentally investigated by a shake-table. Tested structures were made in a 1/3 scale, with realistic material properties and construction methods. Steel frames with high and low flexural rigidity of beams and columns were considered. Each type of frame was tested with three variants of masonry: (i) non-plastered masonry; (ii) masonry infill with conventional plaster on both sides; and (iii) masonry infill with a polyvinyl chloride (PVC) net reinforced plaster on both sides. Masonry bricks were made of lightweight cellular concrete. Each frame was firstly successively exposed to horizontal base accelerations of an artificial accelerogram, and afterwards, to horizontal base accelerations of a real earthquake. Characteristic displacements, strains and cracks in the masonry were established for each applied excitation. It has been concluded that plaster strengthens the infill and prevents damages in it, which results in more favorable behavior and increased bearing capacity of plastered masonry-infilled frames compared to non-plastered masonry-infilled frames. The load-bearing contribution of the adopted PVC net in the plaster was not noticeable for the tested specimens, probably due to relative small cross section area of fibers in the net. Behavior of masonry-infilled steel frames significantly depends on frame stiffness. Strong frames have smaller displacements than weak frames, which reduces deformations and damages of an infill.

• 복식
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• 제33권
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• pp.5-25
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• 1997

The purpose of this study was to analyze the characteristics of the Junk Art represented in the second half 20the century fashion. The highly developed material civilization resulted in human alienations environmental distruption. By this fact human being of the 20the century was to overcome social com-plexity. In this respect this research was focused that how the characteristics of the junk Art was expressed in the second half 20th century fashion. The concepts of the Junk Art lied in the creation of art work in the 2-dimentional plane of 3-dimentional space through the application of all junks (wood pieces industrial debris trash ready-made goods etc) cast by the mod-ern industrial society and the mass production system. Juck Art had been further envigorated in the footstep of the development of the collage method based on the creation of object aes-thetics. And junk artists have untitled social environments with art by assembling junks as a way of exploring the material world of cur-rent society and provided infinite possibilities of expressional medium and technique. Above all junk Art has been reflected in the fashion as well as other art. Especially a lot of the fashion design by the use of junks and the expressive image of junks is produced in the 20th century. That is many of fashion designers have always been aware of what is happening in the arts and have always been able to use the dis-coveries and ideas of the artist to help them solve design problems and creat fashion which are new inventive and reflective of their time. The fashion designers of the junk fashion design could be said to have presented much more possibilities and new development for-mulas to modern fashion design and provided a new order of other formative arts. Unlike the negative and destructive punk cyberpunk fashion junk fashion was a positive and optimistic aesthetics. junk fashion that keeps pace with science and the development of technology is devoted to trying to grasp the real form of ultimate re-ality.

• 한국통신학회논문지
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• 제13권5호
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• pp.390-399
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• 1988

계산 과장이 비교적 간단하고 실시간 처리가 가능한 coding방법 중의 하나인 BTC(Block Truncation Coding)를 이용하여 영상 데이터를 압축하기 위하여 2진 영상에서 주로 사용하는 quar tree 개념을 도입하여 압축율을 개선시키고, 기존의 BTC와 그 성능을 비교하였다. 이 논문에서 제안하는 방법은 그레이 레벨의 변화가 적은 영역에서는 부화상의 크기를 크게 하고, 그레이 레벨의 변화가 큰 영역에서는 부화상의 크기를 작게 하여 전체 부화상의 갯수를 줄임으\ulcorner\ulcorner영상 데이타의 압축을 행하였다. 또한 비트 평면의 효율적인 전송을 위하여 큰 크기의 부화상에 있어서는 Huffman run-length code를, 작은 크기의 부화상에 있어서는 lookup rable방식을 이용하였다. 컴퓨터 시뮬레이션 결과, 크기가 256x256이고, 그레이 레벨이 256인 영상에서 평균 0.8bit/pel의 압축 효과를 얻었다.

• 한국정보과학회논문지:시스템및이론
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• 제27권4호
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• pp.353-361
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• 2000

컴퓨터 그래픽스에서 모델링 요소를 선택하는 것은 사실적인 이미지를 실시간에 생성하는데 중요한 영향을 미친다. 특히 부정형 물체를 모델링하는데 있어서 적은 양의 데이타, 용이한 렌더링 및 확장성은 모델링 요소의 중요한 선택 기준이 된다. 음함수 곡면을 표현하는 많은 모델링 방법들 중 하나인 메타볼 모델은 적은 양의 데이타로 복잡한 곡면을 모델링할 수 있다는 장점을 갖는다. 그러나 곡면이 아닌 육면체와 같은 평면으로 구성되는 물체를 메타볼로 모델링하게 되면 다각형으로 모델링하는 것보다 더 많은 수의 데이타량을 요구하게 된다. 본 논문은 메타볼의 장점을 수용하면서 적은 수의 데이타로 평면형태의 물체까지 모델링할 수 있는 메타볼의 확장 형태인 메타큐브를 제안한다. 메타큐브는 두 개의 매개 변수 값에 의해 구에서 정육면체까지 자유로운 확장이 가능하므로 적은 수의 데이타로 곡면과 평면이 혼합된 물체를 쉽게 모델링할 수 있다.

• 한국소음진동공학회논문집
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• 제24권12호
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• pp.969-976
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• 2014

Nowadays, it is required for naval ships to estimate 3D underwater radiated noise pattern in all direction at peak frequencies of hull vibration for the reduction of being detected and doing the effective operation. For this purpose, the numerical method has to be developed to calculate 3D underwater radiated noise pattern with experimental data. It is very difficult to obtain the experimental data for the real ship. Alternative to get the experimental results is to use NAH(near-field acoustic holography) in acoustic tank with experimental model. Application of NAH in acoustic tank for the experimental model needs some investigation of reflection wave from the wall of the acoustic tank and unmeasured zone of the experimental model due to the supporting structure for it. In this study, the effect of reflection wave in the acoustic tank and unmeasured area of the experimental model when using the NAH was investigated with experiment and numerical model. From these, it is known for the error due to reflection wave can be reduced when the distance between the measurement plane and source is being shorten. Also, unmeasured area of the experimental model gives rise to some error in the estimation of the far-field acoustic pressure.

• 디자인학연구
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• 제16권1호
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• pp.229-240
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• 2003

주거공간의 질적 만족도 향상과 거주자의 다양하고 개성있는 요구에 효과적으로 대응하기 위한 방안으로서 계획된 이 연구는 개인주택과는 달리 다수의 불 특정인을 대상으로 디자인되어야 하므로 다양한 평면계획을 세리 건설하기보다는 보편적인 디자인으로 계획할 수밖에 없는 공동주택(아파트)의 한계점을 극복해 보고자 하는 시도이다. 이를 위하여 조사대상자 360명을 선정하였고, 실 거주자의 선호도를 파악했던 선행연구에 의해 검증된 아파트 실내이미지 유형과 MBTI라고 하는 성격유형검사와 연계하여, 조사대상자의 성격유형에 따라 실내이미지 선호가 달라지는가를 알아보았다. 이러한 연구 결과는 거주자가 요구하는 실내공간의 이미지 특성 및 이에 따른 각종제품에 대한 선호를 예측, 공급할 수 있게 하여, 아파트에서 살기를 원하는 거주자의 만족도를 높이는데 기여할 것으로 사료된다.

• 센서학회지
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• 제10권5호
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• pp.329-336
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• 2001

This paper describes the steering control and geomagnetism cancellation for an autonomous vehicle using an MR sensor. The magneto-resistive (MR) sensor obtains the vector summation of the magnetic fields from embedded magnets and the Earth. The vehicle is controlled by the magnetic fields from embedded magnets. So, geomagnetism is the disturbance in the steering control system. In this paper, we propose a new method of the sensor arrangement in order to remove the geomagnetism and vehicle body interference. The proposed method uses two MR sensors located in a level plane and the steering controller has been developed. The controller has three input variables ($dB_x$, $dB_y$, $dB_z$) using the measured magnetic field difference, and an output variable (the steering angle). A simulation program was developed to acquire the data to teach the neural network, in order to test the ability of a neural network to learn the steering control process. Also, the computer simulation of the vehicle (including vehicle dynamics and steering) was used to verify the steering performance of the vehicle controller using the neural network. From the simulation and field test, good result was obtained and we confirmed the robustness of the neural network controller in a real autonomous vehicle.