• 전산구조공학
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• 제5권4호
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• pp.125-132
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• 1992

본 연구에서는 C++언어를 이용한 객체지향 프로그래밍 기법으로 매트릭스 연산과 평면뼈대 구조물의 해석이 가능한 PC용 구조해석 프로그램을 개발하였다. 객체지향 프로그래밍에서의 주요 개념인 객체, 클래스, 처리방식, 상속성 및 다형성을 도식화하여 설명하였으며, 매트릭스 연산과 평면뼈대 구조해석에 대한 예제 해석 결과는 이 프로그램의 효율성과 타당성을 보여 주었다. 따라서 본 연구는 객체지향 프로그래밍기법의 특징인 프로그램의 확장성과 재사용성 및 다양한 GUI의 구현가능성을 이용하여 앞으로의 객체지향 유한요소 프로그램 개발에 활용될 것이다.

• Corrosion Science and Technology
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• 제12권2호
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• pp.79-84
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• 2013

In general, pipelines at nuclear power plants are affected by various types of degradation mechanisms and may be ruptured after gradually thinning. FAC (Flow-Accelerated Corrosion) is typical aging mechanism affecting the secondary side piping system. In Korea nuclear power plants, CHECWORKS program have been used for management of wall thinning damages. However, sometimes, CHECWORKS program shows wrong results at the stage of NFA (Network Flow Analysis) in case of complex pipelines. This paper describes the calculation results of pressure drop in a complex pipeline and single line by using the CHECWORKS program and the analysis results are compared with those of engineering calculation results including errors between them.

• 한국자동차공학회논문집
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• 제3권1호
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• pp.20-32
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• 1995

Springs for vehicle suspension control the vibration of a car and influence on the ridability, safety, and life of a car. In the paper, the computer aided design program has been developed, which design the leaf spring shape from the given specifications using basic theory and the expert's knowledge, and the design results are checked by the analysis theory in order to increase the accuracy, and feed back to the design input. For the purpose of easy use, this program consists of pull-down menu and interactive input mode. To prove the effectiveness of this program. two springs, of which one is symmetric, other asymmetric, are designed and analyzed, and the outputs are compared to the experiments. Considering the tolerance of the given specifications, the results are good.

• 한국실천공학교육학회논문지
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• 제3권2호
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• pp.106-113
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• 2011

The new computer program, visual SolidMech (ver 2.0), for mechanics of materials and structural mechanics has been developed using visual C++. The visual SolidMech is organized in a format similar to most standard texts on mechanics of materials and structural mechanics. This program consists of a number of menus to perform various calculations as well as a set of dedicated graphical user interfaces. Solutions to problems are given in both graphical and numerical forms. The visual SolidMech will help students develop problem-solving skills by showing them the important factors affecting various problem types, by helping them visualize the nature of internal stresses and member deformations, and by providing them an easy-to-use means of investigating a greater number of problems and variations. This new program can be utilized as a supplement to existing texts in mechanics of materials and structural mechanics.

• 대한영양사협회학술지
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• 제6권2호
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• pp.57-70
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• 2000

The purpose of this study were to : a) evaluate the nutrition status of one hundred and forty five recipients and one hundred and forty nine non-recipients of home-delivered meals service program, b) examine the teeth status of recipients of the program, c)analyze the nutritional values of meals, and identify the attitudes of recipients and non-recipients were found. Four meals offered by Nambu seniors center were met the recommended dietary allowances in calorie, protein, and vitamin C. The mean score of meal satisfaction was 3.7 out of five-point scale.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2000년도 가을 학술발표회논문집(I)
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• pp.363-368
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• 2000

This paper is an introduction of pessimum program for the identification of alkali-silica reaction of alkali-aggregate reaction which is known as one of a major factor of concrete deterioration. A series of gel-pat testing program was undertaken to observe the reactivity of potentially alkali-silica reactive concrete aggregates which were found to be reactive by previous petrographic examination (ASTM C 295). And then a pessimum program was performed in accordance with mortar-bar test method (ASTM C 227) with different percentage of those reactive components included in the fine aggregate source to determine the pessimum quantity. Chert and quartzite were found to be major components of reactive mineral/rock, and the pessimum condition for chert was about 3%, even though the test was performed with up to 25% of the component. In the case of quartzite, however, the mortar-bar expansion appeared to be directly proportional to the amount of quartzite sample with increasing tested quantity up to 35%. Both of the expansion results were well 3 and 6 month specified maximum limitation of 0.05% and of 0.1% respectively.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2006년도 하계종합학술대회
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• pp.469-470
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• 2006

Surface Acoustic Wave(SAW) devices can be used to as wireless sensor elements, called SAW transponders, for measuring shysical quantities such as temperature that do not need any power supply and may be accessed wirelessly. SAW devices were fabricated on Y-Z $LiNbO_3$ piezoelectric substrate with a good temperature coefficient property. The signal response of SAW sensor on the temperature change were compared. To measure the change of SAW velocity. Temperature changed form $20^{\circ}C$ to $400^{\circ}C$ was linearly changed, the SAW sensor is application to the temperature sensor.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2003년도 하계학술대회 논문집 A
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• pp.578-580
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• 2003

This paper describes a research for activation of diect load control program in competitive electicity market. A direct load control program after the restructuring of electric power industry will evolve to the bilateral information system to derive a voluntary participation of demand side resource. Therefore, this paper presented a right way of direct load control program for the foreign market research.

• Molecules and Cells
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• 제39권8호
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• pp.594-602
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• 2016

Alkyl hydroperoxide reductase subunit C from Pseudomonas aeruginosa PAO1 (PaAhpC) is a member of the 2-Cys peroxiredoxin family. Here, we examined the peroxidase and molecular chaperone functions of PaAhpC using a site-directed mutagenesis approach by substitution of Ser and Thr residues with Cys at positions 78 and 105 located between two catalytic cysteines. Substitution of Ser with Cys at position 78 enhanced the chaperone activity of the mutant (S78C-PaAhpC) by approximately 9-fold compared with that of the wild-type protein (WT-PaAhpC). This increased activity may have been associated with the proportionate increase in the high-molecular-weight (HMW) fraction and enhanced hydrophobicity of S78C-PaAhpC. Homology modeling revealed that mutation of $Ser^{78}$ to $Cys^{78}$ resulted in a more compact decameric structure than that observed in WT-PaAhpC and decreased the atomic distance between the two neighboring sulfur atoms of $Cys^{78}$ in the dimer-dimer interface of S78C-PaAhpC, which could be responsible for the enhanced hydrophobic interaction at the dimer-dimer interface. Furthermore, complementation assays showed that S78C-PaAhpC exhibited greatly improved the heat tolerance, resulting in enhanced1 survival under thermal stress. Thus, addition of Cys at position 78 in PaAhpC modulated the functional shifting of this protein from a peroxidase to a chaperone.

• 한국어병학회지
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• 제23권2호
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• pp.221-227
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• 2010

Oxolinic acid를 사육수온($13{\pm}1.5^{\circ}C$, $23{\pm}1.5^{\circ}C$)에 따라서 조피볼락(평균체중 500 g)에 60 mg/kg의 농도로 1회 경구 투여한 다음, 경시적인 혈청내 잔류농도를 분석하였다. $23{\pm}1.5^{\circ}C$의 경우 투여 후 30시간째($0.60{\mu}g/ml$)에 최대혈중농도에 도달하였다. $13{\pm}1.5^{\circ}C$의 경우 투여 후 10시간째($2.22{\mu}g/ml$) 최대혈중농도에 도달하였다. OA의 조피볼락 혈중내 흡수양상과 소실정도는 사육수온에 크게 영향을 받았다. Two-compartment model로 해석하여 WinNonlin program을 이용, 약물동태학적 매개변수(parameter)를 조사하였다. $23{\pm}1.5^{\circ}C$의 경우, 혈장농도－시간곡선하 면적(AUC)은 $42.16{\mu}g{\cdot}h/ml$, 혈중최고농도의 도달시간(Tmax)은 26.13 h, 혈중최고농도(Cmax)는 $0.43{\mu}g/ml$, 예상약물소실시간(Et)은 230시간으로 계산되었다. $13{\pm}1.5^{\circ}C$의 경우, AUC는 $131.98{\mu}g{\cdot}h/ml$, Tmax는 8.81 h, Cmax는 $2.04{\mu}g/ml$, Et는 492시간으로 계산되었다.