• 한국구조물진단유지관리공학회 논문집
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• 제9권4호
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• pp.243-251
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• 2005

본 연구에서는 골조튜브 및 가새튜브시스템의 60층 철골구조물에 말뚝-지반간의 상대변위를 고려한 p-y 스프링 계수를 지반의 깊이별로 적용시키는 방법과, 지반 및 기초를 나타내는 6개의 선형 스프링 계수를 구조물 하부에 적용시키는 방법을 사질토와 점성토에 적용하여 지반 연성을 고려하는 고층 구조물의 지진해석을 수행하였다. 각 경우에 대한 횡변위 및 층간변위, 최대응력, 주기 및 1차 모드 질량참여율을 비교하여 지반-구조물 상호작용에 따른 고층 구조물의 거동을 분석하였고, 그 결과 건축구조설계에서 지반-구조물의 상호작용에 대한 고려가 중요 변수임을 확인하고, 구조시스템 변화에 따른 지반-구조물 상호작용의 영향을 알아보았다.

• 한국안전학회지
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• 제33권5호
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• pp.164-169
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• 2018

A detailed fatigue evaluation procedure was developed to mitigate the excessive conservativeness of the conventional environmental fatigue evaluation method for the pressurizer spray line elbow of domestic new nuclear power plants. The pressurizer spray line is made of austenitic stainless steel, which is relatively sensitive to the environmentally assisted fatigue, and has a low degree of design margin in terms of environmentally assisted fatigue due to the thermal stratification phenomenon on the pipe cross section as a whole or locally. In this study, to meet the environmental fatigue design requirements of the pressurizer spray line elbow, the new environmental fatigue evaluation has been performed, which used the ASME Code NB-3200-based detailed fatigue analysis and the environmental fatigue correction factor instead of the existing NB-3600 evaluation method. As a result, the design requirements for environmentally assisted fatigue were met in all parts of the pressurizer spray line elbow including the fatigue weakened zones by thermal stratification.

• 복식
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• 제50권4호
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• pp.63-72
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• 2000

The purpose of this study was to investigate the effects of lifestyle factors on clothing purchase motives, information use, and selection criteria in male college students. The sample included 241 male college students, and an instrument was developed based on the previous studies. The statistical analyses used for this study were factor analysis and multiple regression. The result of factor analysis showed that lifestyle consisted of six factors : clothing interest, serif-confidence, social participation, planned clothing purchase, family-orientation, and conservativeness. Clothing purchase motives consisted of conspicuous consumption motives, fashion and individuality motives, and economic motives. Clothing information use consisted of four factors: paper/display, personal advice, fashion show/clothing observation, and electronic media. Finally. clothing selection criteria consisted of practicability, fashion/individuality, and conformity, Multip1e regression revealed that there were significant effects of lifestyle factors on clothing purchase motives, information use, and selection criteria. For example, self-confidence factor had a negative impact on conspicuous consumption motive, personal advice information use, and fashion/individuality criteria. The relative importance of lifestyle factors were different according to different dimensions of clothing purchase motives, information use, and selection criteria.

• Nuclear Engineering and Technology
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• 제48권3호
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• pp.820-830
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• 2016

Pipe wall thinning by flow-accelerated corrosion and various types of erosion is a significant and costly damage phenomenon in secondary piping systems of nuclear power plants (NPPs). Most NPPs have management programs to ensure pipe integrity due to wall thinning that includes periodic measurements for pipe wall thicknesses using nondestructive evaluation techniques. Numerous measurements using ultrasonic tests (UTs; one of the nondestructive evaluation technologies) have been performed during scheduled outages in NPPs. Using the thickness measurement data, wall thinning rates of each component are determined conservatively according to several evaluation methods developed by the United States Electric Power Research Institute. However, little is known about the conservativeness or reliability of the evaluation methods because of a lack of understanding of the measurement error. In this study, quantitative models for UT thickness measurement deviations of nuclear pipes and fittings were developed as the first step for establishing an optimized thinning evaluation procedure considering measurement error. In order to understand the characteristics of UT thickness measurement errors of nuclear pipes and fittings, round robin test results, which were obtained by previous researchers under laboratory conditions, were analyzed. Then, based on a large dataset of actual plant data from four NPPs, a quantitative model for UT thickness measurement deviation is proposed for plant conditions.

• Geomechanics and Engineering
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• 제16권2호
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• pp.205-215
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• 2018

Strain-based criteria are known as a direct method in determining the stability of the geomechanical structures. In spite of the widely use of Sakurai critical strain criterion, it is so conservative to make use of them in rocks with initial plastic deformation on account of the considerable difference between the failure and critical strains. In this study, a new criterion has been developed on the basis of the failure strain to attain more reasonable results in determining the stability status of the tunnels excavated in the rocks mostly characterized by plastic-elastic/plastic behavior. Firstly, the stress-strain curve was obtained having conducted uniaxial compression strength tests on 91 samples of eight rock types. Then, the initial plastic deformation was omitted making use of axis translation technique and the criterion was presented allowing for the modified secant modulus and by use of the failure strain. The results depicted that the use of failure strain criterion in such rocks not only decreases the conservativeness of the critical strain criterion up to 42%, but also it determines the stability status of the tunnel more accurately.

• 한국생활과학회지
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• 제18권4호
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• pp.933-944
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• 2009

The purposes of this study was to identify perfume purchasing and using behavior according to men's fashion lifestyle. Self-administered questionnaires were used for data collection. The subjects were 317 men aged 19-40. The results were as follows: First, over half of men had purchased at least one perfume during last year and the price was 30,000-60,000won. Men selected perfumes which harmonized with their image or purposes of using perfumes. Men selected a perfume as a present for their girl friends or wives to convey their concern or love. Most men purchased perfumes at department stores and selected after experiencing samples, and by affecting advertisements of newspapers or journals. Over 60% of men possessed at least one perfume and most of them were imported perfumes. Most men used perfume on a special day such as dates or job interviews, and they received perfume as a gift from their girl friends or wives. Most men used perfumes to enjoy fragrances by themselves and preferred sea fragrance most. Second, factors of men's fashion lifestyle were fashion information, individuality, conservativeness, ostentation, activity, and fashion style. Men were segmented into ostentatious consumption group, active group, fashion leader group, and fashion retard group. Third, fashion leader group purchased perfumes more than other groups and fashion retard group purchased the least.

• 복식
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• 제20권
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• pp.93-104
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• 1993

The purpose of this study is to clarify the adap-tation of traditional beauty of dress in Baek Eui for the establishment of tradition of dress culture. Especially, the color of the traditional dress rep-resent a symbol which is connedted with the na-tional character and the evvironment. But it is hard to examine closely because color preference are transformend with the times. This study is framed within the limits of the next themes : the origin, history and meaning of the Baek Eui ; the philosophical theory of cosmic Five Elements and the Prohibition of Baek Eui ; the beauty of Baek Eui. As the national character is indicative of the conservativeness and the purity, Koreans have kept up wearing Baek Eui spite of the occasional prohibition. Since the color of the dress represen-tatived the signs of the social class and the power, over the eighty persent of the common people put on the Beak Eui : ramie and flax fabrics that has it's own color in Chosun-Dynasty. I think that the use of natural color harmony is prominent and the beauty of Baek Eui is the naturality and the non-artificiality. The meaning of the symbol on the Korean Beak Eui is the divinity, the holiness, the purity, the cleanliness, the modesty, the frugality, the integ-rity, the constancy, the elegance, the simplicity.

• 대한기계학회:학술대회논문집
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• 대한기계학회 2001년도 춘계학술대회논문집A
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• pp.345-350
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• 2001

In order to perform elastic-plastic fracture mechanical analyses, fracture resistance curves for concerned materials are required. 1T-CT specimen was used to obtain fracture resistance curves. But the fracture resistance curve by the 1T-CT specimen was very conservative to evaluate the integrity of the structure. And fracture resistance curve was affected by the specimen geometry and crack plane orientation. The objective of this paper is to be certain the conservativeness of the fracture resistance curve by the 1T-CT specimen and to provide the additional safety margin. For these, the fracture tests using the real pipe specimen and standard 1T-CT specimen test were performed. 4-point bending jig was manufactured for pipe test and direct current potential drop method was used to measure the crack extension and length for pipe test. From the pipe and the 1T-CT specimen test results, it was observed that the J-integral of the 1T-CT specimen test at the crack initiation point was very small compare to that of the pipe specimen test.

• 펄프종이기술
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• 제43권2호
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• pp.40-48
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• 2011

To build up the conservativeness of aged paper heritages, the strength reinforcement treatment using various cellulose derivative solutions was considered. Hand-made Hanji prepared by traditional papermaking technique was firstly simulated in order to modify the overall of paper properties like aged paper heritages by accelerated ageing treatment at $150^{\circ}C$ for 24 hours, and then the ageing stability of Hanji was verified through the secondary accelerated ageing at $150^{\circ}C$ for 12 hours. The physical properties of aged Hanji were improved by applying with cellulose derivative solutions. The ageing stability for physical, optical (L, brightness, opacity, yellowness) and chemical (oxidation index, degree of polymerization) properties of aged Hanji treated with all kinds of cellulose derivative solutions was also good compared to those of untreated samples, especially using MC solution. Therefore, it was that a kind of MC solution would be well-suited for the strength reinforcement treatment of aged paper heritages.

• 한국지능시스템학회논문지
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• 제21권5호
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• pp.630-636
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• 2011

본 논문은 매개변수 불확실성을 가지는 Takagi-Sugeno(T-S) 퍼지 시스템의 안정도 해석과 안정화 조건을 고려한다. T-S 퍼지 시스템의 안정도 해석 시 conservativeness를 줄이기 위해 퍼지 리아푸노프 함수를 이용한다. 매개변수 불확실성을 가지고 있는 시스템의 안정도를 해석하고 시스템을 안정화 시키는 퍼지 강인 제어기 설계 기법을 제시한다. 안정도조건과 안정화조건은 선형행렬부등식의 형태로 표현된다. 모의실험을 통해 제안된 접근 방법의 효용성을 보인다.