• 대한수학회보
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• 제47권6호
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• pp.1163-1170
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• 2010

We study finite type curve in $R^3$(-3) which lies in a cylinder $N^2$(c). Baikousis and Blair proved that a Legendre curve in $R^3$(-3) of constant curvature lies in cylinder $N^2$(c) and is a 1-type curve, conversely, a 1-type Legendre curve is of constant curvature. In this paper, we will prove that a 1-type curve lying in a cylinder $N^2$(c) has a constant curvature. Furthermore we will prove that a curve in $R^3$(-3) which lies in a cylinder $N^2$(c) is finite type if and only if the curve is 1-type.

• Tuberculosis and Respiratory Diseases
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• 제42권2호
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• pp.218-225
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• 1995

연구배경: 기도저항은 body plethysmograph를 이용하여 flow/alveolar pressure의 관계를 측정함으로써 얻어질 수 있는데, 기도저항이 정상인 경우 oscillooscope 상에서 얻어지는 resistance curve가 거의 linear 하나 증가된 경우에는 그 모양이 기울어지거나 loop을 형성하는 경우가 많아 이러한 curve를 분석하여 환자의 임상평가에 도움이 되는 결과를 얻고자 하였다. 방법: 기도저항이 증가되어 있는 환자를 대상으로 body plethysmograph에서 quiet breathing시에 얻어진 resistance curve의 형태를 분석하여 폐기능을 비교하였다. 결과: 1) Resistance curve는 type 1: linear, type 2: ovoid, type 3: sigmoid, type 4: scoop, type 5: paisley의 5가지 형태로 구분할 수 있었으며, 1예를 제외한 type 3과 type 4 및 5는 loop을 형성하였다. 2) Curve의 형태가 특정 질환에 특징적이지는 않았으나 급성질환은 주로 type 1, 및 2, 만성기류폐쇄는 주로 type 3, 4 및 5에 속하였으며, 기관지 천식이나 오래된 폐결핵은 그 정도에 따라 type 1 에서 5까지의 형태를 모두 보였다. 3) Type 1에서 type 5로 갈 수록, loop을 형성 할 수록 기도폐쇄가 심하고 기도저항이 증가되며 잔기량이 커지는 경향을 보였다. 결론: 기도저항을 측정할 경우 기도저항의 측정치 뿐 아니라 resistance curve를 분석하여 기도폐쇄와 air trapping의 정도를 판단하는데 도움을 얻을수 있으며, resistance curve의 모양이 특정 질환에 특징적이지는 않았지만 호기시 loop이 형성되는 경우 심한 기도폐쇄를 시사하였다.

• Computers and Concrete
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• 제15권4호
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• pp.673-686
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• 2015

R-curve based on the size effect law previously developed for geometrically similar specimens (geometry type III) is extended to geometries with variable depth (geometry type I) as well as with variable notch (geometry type II), where the R-curve is defined as the envelope of the family of critical strain energy release rates from specimens of different sizes. The results show that the extended R-curve for type I tends to be the same for different specimen configurations, while it is greatly dependent on specimen geometry in terms of the initial crack length. Furthermore, the predicted load-deflection responses from the suggested R-curve are found to agree well with the testing results on concrete and rock materials. Besides, maximum loads for type II specimen are predicted well from the extended R-curve.

• 한국의류학회지
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• 제39권6호
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• pp.852-866
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• 2015

This study analyzes the form of sleeve heads, which is an important internal element that affects the appearance of jacket sleeves. It characterized sleeve head forms by investigating angles, materials, and a combination of formations for 50 sleeve heads. It conducted an appearance evaluation by comparing and analyzing the results. This paper develops a sleeve head appropriately for sleeve construction. The study results are as follows. First, the product was divided into three parts: based on, force receiving, and sleeve cap parts. There were four types of man's sleeve head: straight, arc, and curve A and B types. The woman's sleeve head had two types: straight and curve B type. Second, the feature of each type of sleeve head was analyzed. A straight type emphasized the based on part. An arc type highlighted the force receiving part while the based on part decreased. The sleeve cap part, force receiving part, and based on part were emphasized in the arc type sleeve head. Third, as a result of the appearance evaluation, each type was rank as straight type < arc type ${\leq}$ curve A < curve B. The straight type did not get positive results as it had extra ease when the sleeve head was attached to a Jacket Sleeve. The arc type was evaluated poorly due to an inappropriate sleeve cap composition. The curve type received an excellent overall outcome as it fit into the sleeve cap part well and highlighted the force receiving part in order to minimize front and back wrinkles. Therefore, the curve type made the resemblance of the jacket appearance perfect and closest to the sleeve pattern.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2004년도 추계학술대회 논문집
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• pp.585-588
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• 2004

In this study, Curve dependent wheel flange lubricator with grease spray type is investigated and estimated a point of view reducing wheel flange wear and noise in the curve through field test on korean rail. Advantage of curve dependent wheel flange lubricator with grease spray type is found on the basis of the result of field test in comparison with oil spray type lubricator and wheel without wheel flange lubricator on railroad in Korea.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2003년도 춘계학술대회 논문집
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• pp.633-637
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• 2003

In this study, Curve dependent wheel flange lubricator with grease spray type is investigated and estimated a point of view reducing wheel flange wear and noise in the curve through field test. Advantage of curve dependent wheel flange lubricators with grease spray type is found on the basis of the result of field test in comparison with flange lubricator of oil spray type and bogie without wheel flange lubricator on railroad in korea.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2006년도 추계학술대회 논문집
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• pp.7-10
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• 2006

In this study, Curve dependent wheel flange lubricator with spray type is investigated and estimated a point of view reducing wheel flange wear and noise, a small crack in the curve. Advantage of curve dependent wheel flange lubricator spray type is found on the basis of the result of field test in comparison with oil spray type lubricator and wheel without wheel flange lubricator on railroad in korea for noise and wheel abraison. the influence of curve dependent wheel flange lubricator spray type on the small crack of wheel is introduced by research papers

• 한국안광학회지
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• 제12권1호
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• pp.53-59
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• 2007

가장 일반적으로 사용되는 주시시차 측정 장치는 Wesson 주시시차 카드이다. 주시시차곡선은 추가한 프리즘량과 주시시차량에 대한 함수이며, 주시시차 곡선에서 진단과 처방에 사용되는 값은 x-절편, y-절편, 기울기, 곡선 타입이다. Wesson 주시시차 카드를 이용하여 102명을 대상으로 주시시차를 측정하였는데, 이 연구의 목적은 Wesson 주시시차카드를 이용한 주시시차 검사법에 의해 주시시차의 방향과 분포 등을 알아보고, 진단과 처방에 응용하는데 있다. Wesson 주시시차 카드를 이용한 주시시차 측정 결과 type I은 63.0%, type II는 0.0%, type III는 25.0% type IV는 12.0%를 얻었다.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2002년도 추계학술대회 논문집(I)
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• pp.188-192
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• 2002

In this study, Curve dependent wheel flange lubricator with grease spray type is introduced and checked and estimated a point of view reducing wheel flange wear and noise in the curve. Advantage of curve dependent wheel flange lubricators with grease spray type is found on the basis of the result of field test applied to KNR No. 1 Line(reconstruction car).

• 대한화학회지
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• 제7권2호
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• pp.96-105
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• 1963

The weight decrease curves of 18 kinds of polymers have been measured by thermobalance at the same condition where temperature is increased $1^{\circ}C$ per minutes under nitrogen or air atmosphere. The curves are further differentiated to obtain rate curve of weight decrease. Those curve offer a method to compare relative thermal stability, effects of oxygen or modes of thermal degradation of polymers qualitatively. The curves could be classified into following four types: Polystyrene, polymethylmethacrylate and acetal polymer belong to the first type. Those polymers depolymerize mainly into corresponding monomers, weight decrease curves are steepy up to perfect vaporization of polymers and rate curves show a relatively sharp peak. (Type I) Polyvinyl chloride represents the second type. This polymer decomposes with splitting off of hydrogen chloride. The thermogravimetric curve rises rapidly at first, then level off at the moderate weight decrease and gradually rises. Polyvinyl acetate also belongs to this class. (Type II) The modification of the second type is represented by polyester. The curve at the early stage is less steep, the leveling off at the next stage is less clear and the final rising of the curve is steeper than the normal second type. Polyamide, polyurethane, and polycarbonate belong to this type. (Type II') The thermal decomposition of the third type polymers is more complex than that of others. Various irregular chain scissions including side chain splitting and depolymerization to monomers occur simultaneously. The weight of the polymer decreases gradually and the rate curve does not show sharp peaks. Polyvinyl alcohol and diene polymers belong to this type. (Type III) Generally, polycondensation polymers are more stable toward heat than addition polymers and polymers having aromatic nucleus show good thermal stability. Polymers having tertiary carbon atoms such as polystyrene or polypropylene and acetal resin start decomposition under airatmosphere at the temprature below $50^{\circ}C$ or more of the temperature where the polymers start decomposition under nitrogen atmosphere.