• 한국식물병리학회지
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• 제11권3호
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• pp.197-209
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• 1995

This paper is a third report about the new fungal diseases of economic resource plants in Korea. It contains short descriptions on symptoms, occurrence conditions, pathogen, and some phytopathological notes for each of 10 fungal plant diseases. They are angular leaf spot of Achyranthes japonica by Cercospora achyranthis causing leaf spot and defoliation in the shade of plants, leaf spot of Armoracia lapathifolia by Cercospora armoraciae causing leaf spot to blight from the rainy season to autumn, hypophyllous mold of Dioscorea tokoro by Distocercospora pachyderma causing leaf spot and yellowing, hypophyllous mold of Artemisia spp.by Mycovellosiella ferruginea causing leaf spot and yellowing, angular leaf spot of Aralia elata by Pseudocercospora araliae causing velvety leaf spot and defoliation, hypophyllous mold of Lycium chinense by Pseudocercospora chengtuensis causing velvety leaf spot and defoliation from the rainy season to autumn, angular leaf spot of Diospyros lotus by Pseudocercospora disospyri-morrisianae causing leaf spot and defoliation from summer to autumn, brown leaf spot of Impatiens textori by Pseudocercospora nojimae causing leaf spot to blight from the rainy season, leaf spot of Cephalonoplos segetum by Ramularia cirsii causing leaf spot to blight throughout the growing season, and white mold of Leonurus sibiricus by Ramularia leonuri causing leaf spot to blight mostly in autumn.

• 대한기계학회:학술대회논문집
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• 대한기계학회 2007년도 춘계학술대회A
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• pp.1499-1504
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• 2007

Spot-welding is widely used to construct passenger car bodies in automotive industry. Occasionally severe spot-weld distortions in sub-assembly make further spot-weld difficult. In this paper, distortions for various spot-weld conditions are measured using coordinate measuring machine. Then, based on finite element solution for unit translation or unit rotation of nugget edge, equivalent loads for spot-weld distortions are determined. They can be used to predict the spot-weld distortion using finite element method.

• 대한기계학회논문집A
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• 제26권3호
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• pp.471-478
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• 2002

In real structures, multi-spot welded joints are more frequently used than a single-spot welded joint. Most researches, however, have been focused to a single-spot welded joint until now. In this paper, the fatigue behavior of multi-spot welded joints are investigated using the finite element solutions of the multi-spot welded specimens. The local strain approach is used rather than the stress intensity factor approach to estimate the fatigue life since the former is quite simple and straightforward. It is found that the fatigue behavior of multi-spot welded joints is different from that of single-spot welded joints. The local strain approach is still applicable to multi-spot welded joints.

• 한국식물병리학회지
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• 제14권1호
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• pp.52-61
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• 1998

This paper is the fifth report about the fungal diseases of economic resource plants observed newly in Korea. It contains short descriptions on symptoms, occurrence conditions, pathogens, and some phytopathological notes for each of 10 fungal plant diseases. They are identified as leaf spot of Adenophora triphylla var. japonica by Septoria lengyelii, leaf spot of Calystegia soldanella by S. convolvuli, leaf spot of Campanula punctata by S. campanulae, leaf spot of Codonopsis lanceolata by S. codonopsidis, leaf spot of Geum japonicum by s. gei, black spot of Oenanthe javanica by s. oenanthes, leaf spot of Oenothera odorata by S. oenotherae, angular leaf spot of Rehmannia glutinosa by S. digitalis, brown spot of Rubus crataegifolius by s. rubi, and leaf spot of Viola verecunda by S. violae-palustris, respectively.

• 대한기계학회논문집A
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• 제22권1호
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• pp.148-159
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• 1998

Spot welding palys a key role in increasing productivity and weight reduction of the final products. This paper proposes a systematic approach on the design of spot weld configuration, dealing with the requried number and location of spot weld joints under the given design parameters, such as the applied loads, lap area, and individual spot weld strength. The optimal design of a spot-welded joint is postulated as a state when the safety factors of all spot weld points (i) are evenly distributed and (ii) reach maximum value. A CAD program is developed to arrange the optimal location of each spot weld based on the derived objective function and constraints. The CAD tool integrates the optimization procedure with Finite Element Analysis (FEA) code through an interface. The interface automatically provides geometrical data and mesh configuration for different spot weld locations to FEA model. It also extracts the transmitted load of each spot weld from the FEA code, and allows the optimization code predict an improved arrangement of spot weld locations. The feasibility of the developed approach is demonstrated by the selected examples.

• 한국정보컨버전스학회논문지
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• 제7권2호
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• pp.59-65
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• 2014

grassfire 스팟매칭 알고리즘은 중심 스팟을 기준으로 이웃 스팟들의 패턴 유사도에 따라 스팟을 매칭하는 알고리즘으로 잔디에 붙는 불이 사방으로 번져가는 방식을 이용한 grassfire 알고리즘을 이다. 씨드 스팟쌍은 매칭이 정확하게 확인된 스팟쌍으로써 매칭이 시작되는 발화점이며 이것으로부터 스팟매칭이 시작된다. grassfire 스팟매칭 알고리즘에서는 스팟매칭을 시작하는 발화점이 필요한데 기존 grassfire 스팟매칭 알고리즘에서는 한 개의 발화점을 이용하였다. 본 논문에서는 grassfire 알고리즘의 스팟매칭의 성능을 높이기 위하여 한 개의 발화점이 아닌 다중의 발화점을 선정하는 방법을 제안한다. 다중 발화점을 이용한 grassifre 알고리즘은 여러 개의 발화점을 선정한 후 개별 발화점으로부터 스팟매칭을 수행하고 결과들을 계산한다. 제안된 알고리즘은 한 개의 씨드스팟을 이용한 방법보다 스팟 검출율과 스팻매칭 정확도의 측면에서 좋은 성능을 보인다.

• 한국자원식물학회지
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• 제9권3호
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• pp.224-229
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• 1996

무궁화 품종 6계통, 총 68종류를 선발하여 flavonoid 성분을 비교하였다. 2차원으로 크로마토그래피를 전개 후 13개의 flavonoid가 관찰되었고 spot 5번의 flavonoid 함량이 전체의 50%를 차지하였으며 나머지는 미량으로 관찰되었다. 6개의 group별 spot출현 양상은 각각 차이를 보였으나 group 내에서는 거의 동일한 것으로 나타났다. 13개의 spot 중 1, 4, 6은 flavonol의 특성을 나타냈으며 나머지 10개의 spot들이 flavone의 특성을 나타내었다. 품종별 flavone함량 및 분포는 백색계통이나 자주 및 청색 계통에는 많은 양이 존재 하였고 pink와 적색 group에서는 매우 적은 양이 분포하였다. Purple spot들의 flavonoid aglycone은 4’, 5-OH의 aglycone 특성을 보였으며 이들 중 spot 5는 saponarin, 7은 vitexin, 9는 xylovitexin, 11은 rhamnosylvitexin으로 동정되었으며 13은 apigenin-7-O-diglycoside로 추정되었다. Saponarin은 백색무궁화에서 전체 flavone량의 50% 이상을 점유하였다.

• Journal of Welding and Joining
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• 제17권6호
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• pp.25-31
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• 1999

Stainless steel sheets are commonly used for vehicles such as the bus and the train. These are mainly fabricated by spot-welding. By the way, its fatigue strength is lower than base metal due to high stress concentration at the nugget. edge of the spot-welding. By the way, its fatigue strength is lower than base metal due to high stress concentration at the nugget edge of the spot-welding point. Especially, it is influenced by welding conditions as well as geometrical factors of spot welded joint. Therefore, it is not too much to say that structural rigidity and strength of spot-welded structures is decided by fatigue strength of spot welded lap joint. Thus, it is necessary to establish a reasonable and systematic long life design criterion for the spot-welded structure. In this study, numerical stress analysis was performed by using 3-dimensional finite element model on IB-type spot-welded lap joint of 304 stainless steel sheet under tension-shear load. Fatigue tests were also conducted on them having various thickness, joint angle, lapped length, and width of the plate. From the results, it was found that fatigue strength of IB-type spot-welded lap joints was influenced by its geometrical factors, however, could be systematically rearranged by maximum principal stress ({TEX}$σ_{1max}${/TEX}) at the nugget edge of the spot-welding point.

• 한국정보과학회:학술대회논문집
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• 한국정보과학회 1999년도 가을 학술발표논문집 Vol.26 No.2 (1)
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• pp.444-446
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• 1999

컴포넌트 기반의 개발과 컴포넌트 개발에 대한 관심이 높아지면서 이를 위한 개발 방법론과 개발 도구들의 도입이 확산되고 있다. 또한 컴포넌트의 재사용 범위를 확장시키기 위해 컴포넌트 개발 시 나타나는 Hot Spot 처리를 위한 분석, 설계기법에 대한 관심이 높아지고 있다. 따라서 본 논문에서는 Hot Spot 처리시에 나타나는 의존적인 Hot Spot을 디자인하는 방법을 제시하고 그 방법을 적용하여 의존적인 Hot Spot을 디자인 할 때 발생되는 Hot Spot 간의 결합도 줄이고 디자인 모델의 가독성을 높인다. 본 논문에서는 디자인 모델링을 위한 표기법으로서 객체지향 모델링 기법인 (UML(Unified Modeling Language)를 이용하여 모델링한다.

• 대한기계학회논문집A
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• 제27권7호
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• pp.1065-1070
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• 2003

In arc spot welding process, the arc is not moving and heat input is concentrated in one spot so that the heat input efficiency of arc is higher than that of GMAW. In other words, the heat input efficiency of arc change during weld time because arc start is done in spot and weld metal is filled. Therefore, the heat input model of arc spot welding should be different from that of general GMAW. In present study, the calculating model of heat input efficiency in arc spot welding was suggested by temperature monitoring near spot in arc spot welding of copper plate. The result showed that the heat input efficiency of arc was changed three times during weld time. The accuracy of calculating method of heat input efficiency was verified by heat transfer analysis of arc spot welding process using finite element method.