• 한국작물학회지
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• 제34권3호
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• pp.270-273
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• 1989

벼 품종의 관수저항성 관련 특성을 검토코자 24일묘를 3일간 관수처리하여 뿌리와 엽신의 POD 비활성도 및 POD 동위효소들을 PAGIF법으로 전기영동하여 본 결과 관수저항성이 상대적으로 약한 일본형품종들은 통일형이나 인도형품종들보다 POD 비활성도가 높았으며 또한 관수처리로 일본형품종들의 엽신부에서는 무관수시 어느 부위에서도 나타나지 않았던 POD 동위효소의 특이 band가 등전점 9부근에서 출현하였다.

• 한국컴퓨터정보학회논문지
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• 제22권7호
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• pp.47-54
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• 2017

Recently, correlation filter based trackers have shown excellent tracking performance and computational efficiency. In order to enhance tracking performance in the correlation filter based tracker, search area which is image patch for finding target must include target. In this paper, two methods to discriminatively represent target in the search area are proposed. Firstly, search area location is estimated using pyramidal Lucas-Kanade algorithm. By estimating search area location before filtering, fast motion target can be included in the search area. Secondly, we investigate multi-channel Local Edge Pattern(LEP) which is insensitive to illumination and noise variation. Qualitative and quantitative experiments are performed with eight dataset, which includes ground truth. In comparison with method without search area estimation, our approach retain tracking for the fast motion target. Additionally, the proposed multi-channel LEP improves discriminative performance compare to existing features.

• 한국전산구조공학회:학술대회논문집
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• 한국전산구조공학회 2002년도 가을 학술발표회 논문집
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• pp.321-329
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• 2002

Artificial neural network has been used for damage assessment by many researchers, but there are still some barriers that must be overcome to improve its accuracy and efficiency. The major problems with the conventional neural network are the necessity of many training patterns for neural network teaming process and ambiguity in the relationship of neural network structure to the convergence of solution. In this paper, the PNN is used as a pattern classifier to detect the damages of the railway bridge using dynamic response. The comparison between the mode shape and the natural frequency of structure as training pattern is investigated for approriate selection of the training pattern in the damage detection of railway bridge using the PNN.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2002년도 추계학술대회 논문집(II)
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• pp.1100-1105
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• 2002

The elasticity of the contact wire is one of important static parameters for the catenary system. This paper presents how to analyse the elasticity of the catenary system using both simple string model method and finite element method with their formula. Analysis results obtained by these two methods for KTX catenary system are compared. A measurement of the elasticity for the KTX catenary under construction which is located near Kumkang bridge is made for the comparison with the analysis results. Both a dynamic and a static methods are tried for the measurement. Because of wave propagation, the dynamic method with 5 km/h running presented an asymmetric variational pattern of the elasticity while the static method presented a symmetric pattern of the elasticity in the span. Measured elasticity using the static method is found to be a little higher than the analysis results. But, the static method can presented us a variational pattern of the elasticity in the span similar to the analysed results. Therefore, the static method can be used for evaluating the elasticity of the catenary system

• Applied Science and Convergence Technology
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• 제23권5호
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• pp.254-260
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• 2014

Organic solar cells have attracted extensive attention as a promising approach for cost-effective photovoltaic devices. However, organic solar cell has disadvantage of low power conversion efficiency in comparison with other type of solar cell, due to the recombination ratio of hole and electron is too large in the active layer. Thus we have change the surface structure of PEDOT:PSS layers to improve the current density by colloidal lithography method using various-size of polystyrene sphere. The two types of coating method were applied to fabricate the different pattern shape and height, such as spin coating and drop casting. Using the organic solvent, we easily eliminate the PS sphere and could make the varied pattern shapes by controlling the wet etching time. Also we have measured the electrical properties of patterned PEDOT:PSS film to check whether it is suitable for organic photovoltaics.

• KIEE International Transaction on Electrical Machinery and Energy Conversion Systems
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• 제4B권3호
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• pp.103-107
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• 2004

Recently, greater attention has been paid to the high-speed generator for its many merits, such as ease of installation, high efficiency and high power density. However, due to their high fundamental frequency, careful consideration needs to be given to both electromagnetic and mechanical design issues. This paper deals with the comparison of two types of permanent magnet high-speed machines. Specifically, the effect of the permanent magnet magnetization pattern on the rotor losses is investigated. On the basis of analytical field analysis and the 2-D finite element method, this paper predicts the flux harmonics and rotor losses under the no-load condition. It is shown that the Halbach magnetization is superior to parallel magnetization in terms of producing rotor losses.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1993년도 하계학술대회 논문집 A
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• pp.418-420
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• 1993

In this paper, we proposed a new FMS Landmark recognition algorithm using color images. Firstly, a NTSC image fame is captured, and then it is converted to a field image in order to reduce the image blurring from the AGV motion. Secondly, the landmark is detected via the comparison of the color vectors of image pixels with the landmark color. Finally, the identification of FMS landmark is executed using a newly designed landmark pattern with a set of reference points. The landmark pattern is normalized against its translation, rotation, and scaling. And then, its vertical projection data are fisted for the pattern classification using the standard data set. Experimental results show that our scheme performs well.

• 한국분말야금학회:학술대회논문집
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• 한국분말야금학회 2006년도 Extended Abstracts of 2006 POWDER METALLURGY World Congress Part 1
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• pp.505-506
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• 2006

This study is focused on the manufacturing technique of powder injection molding of watch case made from zirconia powder. A series of computer simulation processes were applied to the prediction of the flow pattern in the inside of the mould and defects as weld-line. The material properties of melted feedstock, including the PVT graph and thermal viscosity flowage properties were measured to obtain the input data to be used in a computer simulation. Also, a molding experiment was conducted and the results of the experiment showed a good agreement with the simulation results for flow pattern and weld line location. On the other hand, gravity and inertia effects have an influence on the velocity of the melt front because of the high density of ceramic powder particles during powder injection molding in comparison with polymer's injection molding process. In the experiment, the position of the melt front was compared with the upper gate and lower gate positions. The gravity and inertia effect could be confirmed in the experimental results.

• 한국산림과학회지
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• 제38권1호
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• pp.27-32
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• 1978

토양(土壤)의 Water potential(${\psi}_s$)을 몇 단계 다르게 설정(設定)한 경우(境遇) 삽수(揷穗)의 Leaf water potential(${\psi}_l$)은 일일중(一日中) 어떻게 변화(變化)하며, 삽목후(揷木後) 시간(時間)의 경과(經過)와 수종간(樹種間), 삽수(揷穗)의 형태적(形態的) 요인별(要因別), Hormone 처리(處理)의 경우(境遇) 삽수(揷穗)의 ${\psi}_l$변화(變化) pattern은 어떻게 변화(變化)하고 있는 가를 밝혀 삽상(揷床)의 수분영리(水分營理) 지침(指針)의 기초적(基礎的) 자료(資料)를 만들기 위하여 본실험(本實驗)을 하였다. 그 결과(結果)를 요약(要約)하면 다음과 같다. 1. Leaf water potential(${\psi}_l$)의 변화(變化)에 있어 아왜나무, 서향나무의 삽수(揷穗)의 경우(境遇) ${\psi}_s$가 0 bar일때는 토성(土性)에 관계(關係)없는 변화(變化) pattern을 나타내었다. ${\psi}_s$가 -0.01bar 이상(以上)일때는 L.S.가 S.C.보다 -1bar 정도(程度)의 간격(間隔)으로서 최고치(最高値)에 도달(到達)하였다. 2. 일일중(一日中)의 ${\psi}_l$의 변화(變化)는 삽목후(揷木後) 시간(時間)의 경과(經過)와 ${\psi}_s$별(別)로 차이(差異)가 있으나, 최고치(最高値)는 0.2~0.6시(時)에 나타났으며, 아왜나무와 서향나무의 경우(境遇) ${\psi}_s$가 -0.01~-0.02bar이상(以上)일때는 -3bars, -0.03bar 이하(以下)일때는 -4bars를 나타내었으며, 최소치(最小値)는 -20~-22bars 정도(程度)였다. 15일(日)째에 있어서는 5일(日)째보다 최고치(最高値)에 머무르는 시간(時間)이 1/2정도(程度)에 지나지 않았고, ${\psi}_l$의 증가(增加)의 경우(境遇) 시간당(時間當) -1~-2bars정도(程度) 늦게 최고치(最高値)에 도달(到達)하였고, 일일중(一日中)의 ${\psi}_l$의 변화(變化) pattern은 온도(溫度)와 상대습도(相對濕度)의 변화(變化)에 따라 민감(敏感)하게 변화(變化)하고 있다. 3. 아왜나무 삽수(揷穗)의 경우(境遇) IAA 50ppm 처리구(處理區)는 무처리구(無處理區)에 비교(比較)하여 삽목후(揷木後) 15일(日)째에 있어 -2~-3bars 늦게 최고치(最高値)에 도달(到達)하였으며, 최고치(最高値)에 머무르는 시간(時間)도 1/2정도(程度)에 지나지 않았다. 4. 아왜나무는 본실험(本實驗) 조건내(條件內)에서 4엽(葉)을 가진 삽수(揷穗)가 2엽(葉)을 가진 삽수(揷穗)보다 시간당(時間當) -2~-3bars 늦게 최고치(最高値)에 도달(到達)하며 그 발근량(發根量)도 많았다. (Table. 1) 5. 회양목 삽수(揷穗)의 ${\psi}_l$의 변화(變化) pattern은 8엽(葉)이 4엽(葉)보다 시간당(時間當) -2~-3bars 늦게 최고치(最高値)에 도달(到達)하나 발근량(發根量)이 적은 것을 고려(考慮)하면(Table. 2) 발근(拔根)의 생리적(生理的) 저항외(抵抗外)에 상대습도(相對濕度)의 부족(不足)으로 인(因)한 삽수내(揷穗內)의 수분부족(水分不足)에 의한 세포(細胞)의 활력(活力) 쇠퇴(衰退)에 기인(基因)한 저항(抵抗)의 증대(增大)로 인(因)한 변화(變化) pattern임을 예측(豫測)할 수 있다.

• Imaging Science in Dentistry
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• 제32권2호
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• pp.81-87
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• 2002

Purpose : To investigate the diagnostic significance of cortical changes in the bone of diseased jaws utilizing computed tomography (CT). Materials and Methods: Computed tomographic images of 91 patients, consisting of 7 osteomyelitis, 46 cysts, 18 benign tumors, and 20 malignant tumors, were analyzed. The pattern of cortical expansion was classified into three types: no expansion (N), buccal or lingual expansion (B/L), and buccolingual expansion (B & L). The pattern of cortical destruction was classified into four types: no destruction (N), point destruction (PO), gross destruction (GR), and permeative destruction (PE). The pattern of periosteal reaction was classified into four types: parallel, irregular, spicule, and Codmans triangle. The relationship between the pattern of cortical bone changes and diseases of the jaws was assessed. Results: When the pattern of cortical expansion was compared to diseases of the jaw, N-type was most prevalent in cases of osteomyelitis and malignant tumors, B/L-type with cysts, and B&L-types with benign tumors. Comparison between the pattern of cortical bone destruction with diseases of the jaw showed strong correlations between PO and PE-types to osteomyelitis, N-type with cysts, N and GR-types with benign tumors, and GR-type with malignant tumors. Finally, the relationship between the pattern of periosteal reaction to diseases of the jaw showed a strong correlation between parallel-type to osteomyelitis and spicule-type to malignant tumors. Conclusion : The pattern of cortical expansion and cortical destruction is useful in differentiating diseases of the jaws.