• 한국HCI학회:학술대회논문집
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• 2007.02a
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• pp.44-49
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• 2007

반짝이는 특성의 물체에 대해 이미지를 기반으로 색을 추출하는 경우 반짝이는 특성을 포함하면서 내재되어 있는 색 특성을 표현하기 위해 색 곡선(color line)을 이용한다. 이 경우 추출하려는 색이 왜곡되지 않은 가장 적합한 이미지를 선정하는 방법이 필요하다. 이를 위해서 실감모델링을 위해 색 곡선을 기반으로 색을 추출하는 방법을 제시하고 제시된 방법을 위해 색을 추출하기 가장 적합한 이미지를 선정하는 기준을 색포화율(color saturation ratio)을 통해 제안한다. 색포화율이란 색을 구성하는 요소 중에서 최소한 하나 이상의 색이 포화된 픽셀들을 최대 색거리를 가진 픽셀들로 간주하여 계산된 색거리의 총합에 대해 최소한 하나 이상의 색이 포화된 픽셀들의 색거리 총합의 비율를 의미한다. 이상적으로 이 비율이 최소가 되면 하이라이트를 제외한 어떤 픽셀도 포화되지 않기 때문에 반짝이는 특성을 가진 물체의 색을 추출하기 위해 촬영된 이미지는 하이라이트를 제외한 모든 색이 왜곡되지 않은 가장 적합한 이미지가 생성된다. 또한, 이렇게 선정된 이미지에서 추출된 색의 효율성을 보이기 위해 색 공간과 이미지 상에서 다양한 형태의 응용 결과를 제시하였다.

• Journal of Korean Home Economics Education Association
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• v.20 no.3
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• pp.215-230
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• 2008

Activity materials in textbook could facilitate students' oriented self-help learning. The purpose of this paper is to find out characteristics of activity materials in the housing area of middle school Technology and Home Economics and teacher's perception of them. The data were collected from 253 middle school teachers who had ever taught the housing unit in any of 6 textbooks. The results showed that the number of activity materials were differed by the characteristics of the materials such as type of materials, feature of non sentence materials, and type of activity, depend on authors as well as textbooks. In general, teachers interests in the materials were higher than those of students even the trends of the interests were the same. Adequacy of activity contents and related knowledge of teachers were higher than adequacy of level. Teachers thought time and extra search beyond class were barrier to full the interests of students. Further research is suggested to find out whether higher interests in the materials are related to the higher activating rate of them.

• Fashion & Textile Research Journal
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• v.18 no.5
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• pp.695-707
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• 2016

This study presents quantitative evaluation standards for the shape fitness test, conducted in the process of the slacks fit test. This study aims to quantify appearance sensory test of slacks for the objectification of qualitative evaluation methods in existing shape fitness tests. The subjects were women of standard body type between the ages of 18 and 24. Slacks differing in their ease in waist girth, hip girth, crotch length and knee length were designed to test their shape fitness. The gap volume distribution between the body and slack, angle of the baseline by body part, and ratio of total thickness from the sideline using 3D human body scan data (which reflect the results of the appearance sensory test) were presented as quantitative evaluation standards. There were less wrinkles in the wrinkle/overstretch and ease categories of the appearance sensory test; in addition, ease was adequate and small enough to comfortably perform basic human activities in the standing upright posture. The gap volume distribution analysis between body and slacks showed that curves increased in the slacks surface along with an increase of ease in slacks and suggested that wrinkles also increased. In the baseline's horizontal categories in terms of a $0^{\circ}$ horizontal angle, the range of angles were evaluated as adequate by the clothing expert group. The total thickness ratio of 0.5:0.5 divides into the sideline from the baseline.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.12 no.3
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• pp.352-359
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• 2001

We propose the row method that is able to consider the SAR compliance test from the very beginning step of developing the mobile phone. The reason this new method is plausible is that we adopt the certified FDTD for the reliability of calculation, utilizing 1 mm high resolution model that is to model the phantom and the mobile phone almost identically to the reality. In this paper we introduce the process that will apply the proposed method in order to reduce the SAR of the mobile phone that has been problematic in satisfying the SAR compliance test. It results in dropping in the SAR that we keep the mobile phone or its antenna while we use it. Therefore here we make a claim as fellows. When we develop the new mobile phone, we should use the computer simulation combining the CAD design and radiation pattern rather than make a prototype and then use the trial and error method. Moreover the former way leads us to boost up the developing efficiency and reduce the cost.

• Journal of the Korean Geosynthetics Society
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• v.5 no.2
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• pp.39-44
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• 2006

The resistance of flexible PVC geomembranes to leachate chemicals is an important factor when PVC geomembranes are being considered as a barrier layer in a composite liner system. This paper describes laboratory test results that evaluate the chemical compatibility of a 0.76 mm (30 mil) thick flexible PVC geomembrane exposed to a synthetic municipal solid waste (MSW) leachate. Changes in dimensional, physical, and mechanical properties were measured after exposure to the synthetic MSW leachate at $23^{\circ}C$ and $50^{\circ}C$ for 30, 60, 90, and 120 days. Although some variability of the test results is observed due to experimental factors and product variability, the synthetic MSW leachate did not significantly degrade the physical or mechanical properties of the flexible PVC geomembrane. As a result, this paper will conclude the PVC geomembranes are not adversely affected by the synthetic MSW leachate.

• 한국정보교육학회:학술대회논문집
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• 2005.08a
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• pp.183-192
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• 2005

이동 통신 가입자 수가 빠르게 늘어가면서 무선 인터넷 기술은 다양한 형태의 데이터 제공이 가능해 지고 이에 대한 교육적 활용에 대한 관심이 증대되고 있다. 이에 따라 무선 인터넷만의 장점인 이동성, 실시간성, 휴대성, 편리성, 개별화, 차별화 등을 이용하여 학습에 적용하는 것은 매우 중요한 의미를 지닌다. 또한 학습에 있어서 학습하고자 하는 욕구인 동기가 중요시되어야 하며 이에 따라 학습 성취도는 큰 영향을 가진다. 따라서, 본 논문에서는 보편적으로 잘 알려진 Keller의 ARCS 모형을 기반으로 하여 무선 인터넷 환경에 적합하도록 수정, 보완하여 동기 모형을 제시하고 적용하고자 한다. 본 모형의 특징은 다음과 같다. 첫째, 개별화 및 차별화에 중점을 두었다. 모바일 환경의 가장 큰 특징인 개별화, 차별성을 부각시켜 동기 전략에 적용하였다. 둘째, 학습자 진단에 비중을 두어 설계하였다. 모바일에서 개별화의 가장 큰 기준이 되므로 정확한 진단을 할 수 있도록 한다. 셋째, 무선 인터넷에 적합한 동기 전략을 제시하여 단계별 적용을 용이하도록 하였다. 넷째, 평가 및 피드백 후 교사에 의한 학생 개개인의 결과를 제시하도록 하였으며, 이를 통해 후속 학습에 도움이 되도록 하였다. 또한, 본 동기 모형을 초등학교 3학년 쓰기 활동에 적용하였다.

• Proceedings of the Korea Information Processing Society Conference
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• 2016.10a
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• pp.96-97
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• 2016

본 논문에서는 현재 오픈소스 형태로 개발이 진행되고 있는 프로그래머블 데이터 플레인 언어, P4와 Domino를 언어의 확장성 측면에서 비교분석한다. 언어의 응용사례를 통해 각 언어의 활용 가능 범위를 살펴보고, 일반적인 스위치 모델로서의 적합성을 판단한다.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2008.08a
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• pp.133-137
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• 2008

본 논문에서는 영상의 콘트라스트를 개선시키는 언샵 마스킹 방법을 제안한다. 언샵 마스킹은 이미지가 가지고 있는 에지와 디테일 정보를 개선시키는데 일반적인 샤프닝 마스크 보다 효과적이기에 이에 관한 많은 연구가 있었다. 제안하는 방법은 방향성 정보를 이용한 블록 기반 업샵 마스킹 방법으로 영상을 블록 단위로 분할하여 각 블록에 대한 DCT를 수행한다. DCT 결과를 토대로 블록들의 방향성 타입을 결정하여 각 블록의 타입에 따라 적합한 언샵 마스킹을 취할 수 있는 유연함을 제공 한다. 블록의 분류는 평탄영역, 텍스쳐, 에지 그리고 나머지 형태로 구분되어 진다. 평탄 영역에 속하는 배경 및 평이한 표면에서는 결과물을 시각적으로 훼손시키지 않기 위해 언샵 마스킹을 적용하지 않는다. 텍스쳐와 에지 영역에 대해서는 고주파 성분을 보존하기 위해 블록 타입에 맞는 적합한 언샵 마스킹을 적용한다. 이에 사용되는 언샵 마스킹은 선명화의 기여도를 제어하는 적응적 필터를 사용하여 디테일이 많은 부분은 콘트라스트를 개선시키고 평탄 영역에 대해서는 선명화를 약하게 하여 최대의 영상 개선 효율을 유도한다.

• Journal of Chest Surgery
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• v.36 no.2
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• pp.63-72
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• 2003

Although a variety of synthetic vascular grafts are available in modern vascular surgery, no ideal prosthesis ha,4 yet been developed. Small-caliber vascular grafts with low flow, as used in the lower extremity, continue to become thrombosed at unacceptable rates. We have developed and evaluated the new antithrombogenic blood contacting surfaces in canine model. Material and Method: Two now antithrombogenic blood contacting surfaces(Polyvinylalcohol -Polyurethane(PVA-PU) blend and natural Graphite-polyurethane(G-PU) blend) have been developed and evaluated in canine model, using vascular grafts and patches. The luminal surfaces of the test vascular grafts(5 mm ID) were fabricated by dipping a glass rod in PVA-PU blend solution(50 % PVA) using phase separation method. Mongrel dogs of either sex weighing 18-22 kg were anesthetized by endotracheal intubation using halothane and their lungs were ventilated with a volume-cycled ventilator, Maintenance anesthesia with 0.5-1.0% halothane and supplemental oxygen was used. Two pairs were used for comparison in the bilateral femoral arteries for both vascular grafts(PVA-PU vs. PU) and vascular patches(G-PU vs. PU). Bilateral groin incisions were made and the arteries were exposed and clamped. After an excision of 1 cm of the artery between clamps, a grail of 2.5 cm in length was implanted end-to-end using 6-0 polypropylene suture. The vascular patch was implanted as a form of on-lay patch. Animals were sacrificed at 1, 2, 4, 6, 8 and 16 weeks for vascular grafts and 1, 2. 4 and 6 weeks for vascular patches. Result The vascular grafts of PVA-PU blends showed patent lumina in the 2 and 16 weeks animals, while those of PU showed a patent lumen in 2 weeks animal. PVA-PU graft of 16 weeks showed a fairly clean luminal surface. A light microscopic finding of this graft demonstrated good tissue infiltration through porosity, The animals with vascular patches showed patent arteries in both groups except 2 weeks animal. Scanning electron microscopy of the luminal surfaces of G-PU patches in 4 and 6 weeks animals showed endothelial cell covering with microvilli. PU patches showed qualitatively less endothelial cell covering. Conclusion: In conclusion, PVA-PU and G-PU blends can be a promising blood contacting surfaces for application in a synthetic vascualr graft. However, further animal study is needed to determine the real long-term effects of these methods of surface modifications.

• Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
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• v.18 no.2
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• pp.179-189
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• 2000

This study is tried to organic combination in implementing the suitability analysis of urban landuse between GSIS and ANN(Artificial Neural Network). ANN has merit that can decide rationally connectivity weights among neural network nodes through procedure of learning. It is estimated to be possible that replacing the weight among factors needed in spatial analysis of the connectivity weight on neural network. This study is composed of two kinds of neural networks to be executed. First neural network was used in the suitability analysis of landuse and second one was oriented to analyze of optimum landuse pattern. These neural networks were learned with back-propagation algorithm using the steepest gradient which is embodied by C++ program and used sigmoid function as a active function. Analysis results show landuse suitability map and optimum landuse pattern of study area consisted of residental, commercial. industrial and green zone in present zoning system. Each result map was written by the Grid format of Arc/Info. Also, suitability area presented in the suitability map and optimum landuse pattern show distribution pattern consistent with theroretical concept or urban landuse plan in aspect of location and space structure.