• 한국통신학회논문지
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• 제28권3B호
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• pp.209-216
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• 2003

본 논문에서는 네트워크가 많은 endpoint를 가질지라도 낮은 비트율의 데이터를 효율적으로 전송할 수 있는 AAL 유형 2 스위치를 포함하는 ATM 스위치 구조를 제안한다. 컴퓨터 프로그램으로 모델링한 ATM 스위치는 AAL 유형 1, AAL 유형 2, AAL 유형 3/4 및 AAL 유형 5 셀로 이루어진 모든 유형의 AAL 셀에 대해 셀 스위칭을 지원하고 있다. 우리는 2가지 방식의 스위치를 제안하고 있는데, 하나는 개별적인 입력 포트마다 AAL 유형 2 셀 처리를 지원하는 스위치 패브릭이고, 다른 하나는 모든 입력 포트에 대한 전체적인 AAL2 셀 처리를 지원하는 스위치 패브릭이다. 시뮬레이션 결과는 후자의 방식이 전자의 방식보다 우수한 것으로 나타났다. 그러나, 전자의 방식이 구현에 용이하고, 확장성에 대한 장점을 가지고 있다. 본 논문의 ATM 스위치 패브릭은 범용의 ATM 스위치 패브릭으로서 뿐만 아니라 ATM 네트워크상으로 모바일 통신, 협대역 서비스 및 무선 ATM등에 폭넓게 응용될 것으로 사료된다.

• The International Journal of Costume Culture
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• 제13권2호
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• pp.154-159
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• 2010

Various decorative patterns and sculptures found in antique architectures like palace architecture and temple architecture are not only valuable assets of our culture but have religious meaning at the same time and show aesthetic aspiration and desire of Korean people. In this study, potential application of patterns in textile industry is suggested based on the reconstructed and patternized geometric patterns of window grids, a decorative element in architecture, and stair and stair somaetdol, a architectural element in Buddhist temples, using Photoshop and Illustrator program of Adobe INC AND Tex-pro program of Youngwoo CNI INC. All around the world today, efforts to reinterpret unique and antique architectures and cultural assets in a modern way has been increasing. Decorative patterns displayed in Buddhist temple architectures which are antique Korean architectures have excellent geometric aesthetic value. And the development potential of patternizing these elements into modern designs is high. Therefore, it is thought to be possible to develop high value-added fabric and to develop various fashion items including apparel and interior decoration based on modern reinterpretation of patterns of window grid and decorative elements of stairs and stair somaetol that are part of our antique architectures.

• 한국정보통신학회:학술대회논문집
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• 한국해양정보통신학회 2004년도 춘계종합학술대회
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• pp.291-294
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• 2004

본 연구는 단일 입력 및 다중 출력 크로스바 방식의 스위치 구조에 관한 연구로써 특히 고효율의 방송 기능을 가지는 가변형 방송스위치 구조를 지원한다. 입력 및 출력 버퍼 스위치(input and output buffer switch)에서 중앙 중재기(central arbiter)가 다중 입력포트로부터의 전송 요청(request)을 모아서 모든 입력포트들이 공유하는 각 출력포트에서 최대한 많은 전송 허가(grant)를 빠른 시간 내에 결정하고 그 결과를 각 입력 버퍼들에게 고속으로 전달(transmission)하는 기능을 지원하는 스위치 구조에 관한 것으로 특별히 방송 패킷(broadcast packet)을 스위칭 함에 있어 높은 처리율 (high throughput)을 제공하면서 고속으로 대용량 스위칭(large scale switching) 기능을 제공한다.

• 한국통신학회논문지
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• 제33권6B호
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• pp.395-402
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• 2008

Aggregate bandwidth required by the internet is expected to be explosively increased. To meet this anticipated need, an ultra high speed internet backbone transport network, capable of supporting up to a Tbps traffic capacity, is required. this thesis examines, through computer simulation and modeling, the technological requirements and assesses the performance analysis and feasibility for implementing ultra-high speed NGI backbone transport network fabric based on WDM technology. The study results are that C/L band EDFA spectral gains for ultra high speed DWDM have been improved from 2.61dB/1.5386dB to 0.03dB/0.096dB by proposed architecture.

• 한국실내디자인학회논문집
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• 제25호
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• pp.229-235
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• 2000

Although Frank Lloyd Wright represents himself as one of the greatest American master architect, the master architects contribution towards the advancement in the modern history of architecture goes beyond just creating landmark buildings. Through out his life, he was the leading architect not only in the area or architectural design but showed his talent in interior architecture, furniture, fabric, lighting fixture, art glasses, tablewares, silver wares as well as in graphic design which should cover all the elements related to the "total design" in architecture. As seen in his architectural design, the "total design" concept also reflects both beauty and logic of the nature and strengthens his theory of the organic architecture design. The research began with finding out the relationship between his architecture, nature and the supporting design elements mentioned above. the purpose of the research is to analyze the relationship of the spatial organization and the design elements in Frank Lloyd Wrights architectural works from the point of "total design" view and provide the valuable guide line for the development of the modern interior design. His design theory, based on the fundamental ideas of the nature, his organic architecture design, and reference materials to support total design concept will be discussed on chapter 2. And on chapter 3, application of the total design in his actual project will be analyzed. The data and analyzation have been completed based on written references and actual visit to the project sites. Frank Lloyd Wright placed highest value on the human beings and enjoyed presenting new ideas and forms to create better environment for the humans through his architecture and interior design projects. While he was presenting new ideas he continued to support design for democracy which has close relationship to the new frontier spirit of America. He was the master architect for the general society with accurate understanding of the life style of the public with design sensitivity shown in his concept of the total design.s concept of the total design.

• 한국조경학회지
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• 제29권1호
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• pp.152-160
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• 2001

This study is conducted to evaluate the effects of containerized landscape tree production methods on post-transplant stress. Two types of container such as plastic pot(pot), fabric growing bag(bag) were adopted to restrict tree roots. Each types of containers was divided into seven sub-types. One traditional production method was included as comparison. Two landscape woody plants species (Magnolia denudata, Albizzia julibrissin) were implanted in the 7 sub-types of container. After one or two growing season in the container, each types of container trees was transplanted. Half of the trees were transplanted in the mild spring season, and another half of trees were transplanted in the improper summer season. The data were collected on the crown wilting ratio and trunk die-back ratio. The result of the analysis based on these data were as follows; 1) The container production methods were lower than the traditional production methods by 3 times in the average wilting ratio of summer season's transplanting point. 2) Post-transplant stress was more successfully mitigated, in case the "pot" type as was the "bag" types of container. 3) The effective and economic way of mitigating post-transplant stress by container production methods was selecting container plants of vigorous and deep root systems. 4) The "pot" type of container was to restrict tree roots more successfully, But, winter chilling and low temperature attacked the "pot" type tree's twigs and suckers. These results indicated that "pot" grown container plants should managed carefully during the winter after transplanting. Based upon the results of this study, a subsequent research on the development of container material, growth type of the container trees, and other maintaining method will be required.es, and other maintaining method will be required.

• Composites Research
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• 제17권1호
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• pp.38-46
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• 2004

본 논문의 목적은 탄소섬유 건직물의 토우 구조의 미소 거동과 변형 중의 평면 하중과의 관계를 규명하는 것이다. 평면 하중은 변형 중에 토우들을 재배치하며, 결국에는 잠김 현상을 유발하게 된다. 본 논문에서는 토우 간격, 주름각등의 미소 변형 변수들을 관찰하기 위해 일방향 편향 인장실험과 이축 인장실험을 겪은 시편들을 전단각에 따라 분류하여 현미경을 이용하여 변형 경향을 관찰하였다. 전단각에 따른 변형된 토우 구조의 변화를 간단한 설계 변수 모델을 이용하여 근사하였다.

• 한국복합재료학회:학술대회논문집
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• 한국복합재료학회 2005년도 춘계학술발표대회 논문집
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• pp.111-115
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• 2005

Recently, natural fibers draw much interests in composite industry due to low cost, light weight, and environment-friendly characteristics compared with glass fibers. In this study, mechanical properties were evaluated for two extreme cases of jute fiber orientations, i.e. the unidirectional yarn composites and the felt fabric composites. Samples of jute fiber composites were fabricated by RTM process using epoxy resin, and tensile, compression, and shear tests were conducted. As can be expected, unidirectional fiber specimens in longitudinal direction showed the highest strength and modulus. Compared with glass/epoxy composites of the similar fabric architecture and fiber volume fraction, the tensile strength and modulus of jute felt/epoxy composites reached only 40% and 50% levels. However, the specific tensile strength and modulus increased to 80% and 90% of the glass/epoxy composites. The main reason for the poor mechanical properties of jute composites is associated with the weak interfacial bonding between fiber and matrix. The effect of surface treatment of jute fibers on the interfacial bonding will be examined in the future work.

• Geomechanics and Engineering
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• 제7권2호
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• pp.213-231
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• 2014

An elastoplastic model for structured clays, which is formulated based on the fact that the difference in mechanical behavior of structured and reconstituted clays is caused by the change of fabric in the post-yield deformation range, is present in this paper. This model is developed from an elastoplastic model for overconsolidated reconstituted clays, by considering that the variation in the yield surface of structured clays is similar to that of overconsolidated reconstituted clays. However, in order to describe the mechanical behavior of structured clays with precision, the model takes the bonding and parabolic strength envelope into consideration. Compared with the Cam-clay model, only two new parameters are required in the model for structured clays, which can be determined from isotropic compression and triaxial shear tests at different confining pressures. The comparison of model predictions and results of drained and undrained triaxial shear tests on four different marine clays shows that the model can capture reasonable well the strength and deformation characteristics of structured clays, including negative and positive dilatancy, strain-hardening and softening during shearing.

• 한국환경과학회지
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• 제15권10호
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• pp.945-949
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• 2006

For a membrane bio-reactor, it is possible to fillet and separate activated sludge and effluent by head loss of centimeters, if non-woven fabric material is used as titration media. However, if non-woven fabric material is used to thicken high-concentration sludge, excessive sludge attachment causes the rapid decrease of flux. Mesh with fore sizes of $100{\mu}m,\;150{\mu}m,\;and\;200{\mu}m$ allows for easy separation of attached sludge. This study examined the possibility of mesh as filtration media. Existing close-flow filtration process, which requires maintaining sludge movement, makes It difficult to obtain high thickening rate. With a view of complementing this weakness, this study has made an experimental examination on how high-concentration sludge (about 3,000mg/L to 10,000mg/L) will be filtered and thickened when mesh module is submersed in the bio-reactor. Effluent flowed from the bottom of the bio-reactor by head loss of 65cm. In case of pore size of $100{\mu}m$, SS showed high recovery of 80% to 96%; therefore, it has been decided that mesh can be used as filtration media. Filtration lasted for more than 9 hours, until sludge with 9,000mg/L in MLSS concentration was thickened 9 times as dense. In the range from 3,610mg/L to 9,060mg/L in MLSS concentration, it was possible to obtain effluent with less than 2mg/L in MLSS concentration within 10 minutes.