• 대한기계학회논문집A
• /
• 제35권9호
• /
• pp.1007-1013
• /
• 2011

상용차용 다층관 벨로우즈는 우수한 유연성과 내구성이 요구되므로 단층으로 제조되는 승용차용 벨로우즈와는 다르게 다층의 형태로 제작된다. 단층 벨로우즈의 유한요소해석과 최적화에 대한 연구는 활발히 진행되고 있으나, 층과 층사이에 갭이 존재하는 다층형 벨로우즈의 유한요소해석과 최적화 연구는 미진하다. 따라서 본 연구에서는 해석의 신뢰성 향상을 위해 다층형 벨로우즈에 적합한 유한요소 모델을 제시하였으며, 다층관 벨로우즈의 형상 최적화를 위해 실험계획법과 D-Optimal 방법에 기반을 둔 순차적 실험계획에 의한 크리깅 메타모델을 적용하였다.

• 복식
• /
• 제66권4호
• /
• pp.61-76
• /
• 2016

The importance of environment has come into focus recently, and this has led to increased attention on zero waste fashion design as a method to minimize waste from the production stage of fashion goods. The purpose of this study was to analyze the development method types and the characteristics of zero waste fashion design in order to study the eco-friendly meanings of zero waste fashion design, as well as its meaning as creative design development methods. Through the case analysis of recent designs, the design types of zero waste fashion design were largely classified into cut and sew, folding, draping, and non-woven types, and they were classified again according to the characteristics of production process. According to the result of analyzing fashion design development methods of zero waste fashion designs based on the process of completing design, they were classified into pattern making, computer programming, draping, assembling of the unit, and non-woven moulding methods, and the aspect of combined use rather than utilization of one method appeared. Formative characteristics of zero waste fashion design included decorative beauty, formative beauty, and transformable beauty and its design characteristics were fortuity and unexpected properties, breaking stereotypes, structural flexibility and futuristic innovation.

• 대한조선학회지
• /
• 제25권3호
• /
• pp.35-45
• /
• 1988

This paper presents a sophisticated Sequential Linear Approximation Method(SLAM) to solve nonlinear optimization problem and the performance of this method is compared with those of the Penalty Function Method(SUMT), Tangent Search Method(TSM) and Flexible Tolerance Method(FTM). To improve the convenience and flexibility in using the proposed SLAM, an user oriented design optimization language is developed and the application examples are shown for the optimization of propeller principal dimensions and the optimization of bulk carrier principal particulars.

• 한국지반신소재학회논문집
• /
• 제13권4호
• /
• pp.21-31
• /
• 2014

최근 전 세계적으로 화석연료 고갈에 대비하여 신재생에너지에 대한 연구가 활발히 진행 중에 있다. 특히, 해상풍력발전기는 경제성 측면에서 매우 뛰어난 기술로 알려져 있다. 그런데, 해상 풍력발전기는 바람과 풍력 하중 때문에 저면에 큰 모멘트가 발생하므로 대구경 모노파일을 적용하는 것이 필요하다. 이 때, 대구경 말뚝을 경제적으로 설계하려면 기초구조물의 강성이 타워의 최대 모멘트 값에 미치는 영향을 고려하는 것이 중요하다. 본 연구에서는 기초구조물 강성을 산정할 때 모노파일의 대구경 효과를 정밀히 고려하기 위하여 3차원 유한요소해석을 수행하고, 기존의 p-y 해석법에 의한 강성산정 결과와 비교하였다. 본 연구에 적용한 예제의 해석결과, 기초구조물의 강성 산정방법에 따른 말뚝두부 최대 모멘트 값의 변화는 크지 않았지만 말뚝두부 최대 기울어짐 각의 경우 유한요소해석법이 p-y 해석법에 비하여 14% 증가하는 것으로 나타났다. 그러므로, 기울어짐 각이 성능수준에 영향을 미치는 경우 유한요소해석법을 적용하여 기초강성 효과를 정밀하게 고려하는 것이 필요한 것으로 판단된다.

• 한국간호교육학회지
• /
• 제14권2호
• /
• pp.282-293
• /
• 2008

Purpose: This study was done to identify the effects of an exercise correction program for scoliosis on the physical and psychological functions of middle-school students with scoliosis. Method: The design of this study was a nonequivalent control group pretest-posttest design. The students who participated in the study were 45 middle school students with scoliosis. Twenty-four students were assigned to the experimental group and 21 to the control group. The treatment given to the experimental group was a scoliosis correction exercise program. The scoliosis correction exercise program was given 3 times a week for a period of 12 weeks. Result: For Cobb's angle, a significant decrease was observed in the experimental group. For flexibility, the sit-and-reach test showed a significant increase in the experimental group. For depression, self-esteem and body satisfaction, the difference between the two groups was not significant. Conclusion: Based on the above results, the effects of a spine correction exercise program produced a decrease in Cobb's angle and an increase in the sit-and-reach test for flexibility. This program is not expensive and is convenient, and thus has been identified as a good nursing intervention for correcting scoliosis.

• 기본간호학회지
• /
• 제18권2호
• /
• pp.177-185
• /
• 2011

Purpose: To examine the effects of Tai Chi exercise (TCE) on muscle strength, flexibility of low extremities, postural balance and cognition in patients with Parkinson disease (PD). Method: A nonequivalent control-group pre and post-test design was used. Of the 30 participants 15 were assigned to the experimental group and 15 to the control group. The experimental group participated in 8 weeks of TCE which included one day of exercise with instructor on site and 3 days of self-exercise at home guided by a videotape. Results: The 8 weeks of TCE were found to be significantly effective in enhancing strength of low extremities, flexibility of ankles and shoulders, time of tandem stand with eye closed and level on the K-MMSE (Korean mini mental state examination). Conclusion: These results suggest that TCE has positive effects on physical fitness and cognition in patients with PD. Research over an extended period with the TCE intervention is recommended to identify further effects.

• Corrosion Science and Technology
• /
• 제5권2호
• /
• pp.69-76
• /
• 2006

Premature cracking of the epoxy coatings applied on ship's ballast tanks(BT) can lead to damage of ship's hulls. To avoid this, it's important to have clear understanding of the underlying mechanism and primary factors of the coating crack. In this study, the efforts were made to clarify the integrated effects of main factors, i.e., initial coating shrinkage, thermally induced strain, steel-structural strain and the intrinsic coating flexibility at the initial and after aging, to the early cracking phenomena of epoxy coating in the ship's ballast tank. The coating crack is caused by combination of thermal stress, structural stress, and internal stresses which is closely related to chemical structures of the coatings. On the other hand, thermal stresses and dimensional stabilities would rarely play a major role in coating crack for ballast tank coatings with rather large flexibility. Crack resistance of the coatings at early stages can be estimated roughly by measuring internal stress, FT-IR and $T_g$ value of the coatings. A new screening test method was also proposed in this study, which can be possibly related to the long-term resistance of epoxy-based paints to cracking.

• 대한간호학회지
• /
• 제37권4호
• /
• pp.478-489
• /
• 2007

Purpose: The purpose of this study was to determine the effects of a Health Maintenance Program on physical functions and mental health of the elderly in nursing homes. Method: Sixty elderly(over 65 years old) in a randomized control study participated in a 16-week group-based intervention including functional exercises and health education. The participants were divided into 3 groups(Health Maintenance Program Group, Supportive Music Exercise Group, and Control Group) of 20 elderly each. Data was collected from Dec. 1st, 2005 to Mar, 30th, 2006. Physical function of lower body strength was assessed using a 30-second chair test, flexibility was assessed using a sit-and-reach test, and static balance was assessed by the ability to balance on one leg with open and closed eyes. Depression was assessed using the Korean Form of the Geriatric Depression Scale and self esteem was assessed using Rosenberg's Self Esteem Questionnaire. Data was analyzed by Chi-square test, One-way ANOVA, and Repeated measure two factor analysis. Results: A Health Maintenance Program significantly increased muscle strength, flexibility and static balance, but depression and self-esteem scores were not significantly changed. Conclusion: Findings demonstrated that a Health Maintenance Program was more effective on physical function than mental health of the elderly in nursing homes.

• 신재생에너지
• /
• 제7권2호
• /
• pp.18-27
• /
• 2011

Management flexibility to adapt its future actions in response to altered future market conditions can expand the value of an investment opportunity by improving its upside potential without the change in the downside losses. Module manufacturers in solar industry continuously have to decide how much and when its production capacity should be expanded with regards to the demand in the global markets. Either over- or under-investment can cause sunk and/or opportunity costs to the module manufacturers. Option of exercising the additional investments only on favorable opportunities can increase total value of the investment. This paper analyzes the case which shows that the expansion of production capacity with more expandibility can have more value than the rigid plan of capacity expansion. The expansion option value is equivalent to KRW 38.286 billion, thus switching the negative NPV of the initial investment opportunity into the positive value. High volatility and the high growth in the cashflows as the major business features of the renewable energy provide condition where real options can play the crucial role in increasing the investment value as well as in determining the size and timing of capacity expansion in the course of capital budgeting process.

• 근관절건강학회지
• /
• 제10권2호
• /
• pp.156-166
• /
• 2003

Purpose: To investigate the effects of self-management course in patients with ankylosing spondylitis. Method: Forty-nine subjects were sampled according to research criteria, and divided into two groups: 24 of the experimental group and 25 of control group. To the experimental group, self-management course which developed by the investigators was applied for 6 weeks, each session adopted for two hours per week and additional 30-minutes exercise was carried out two times a week. Result: After participating the self-management course in experimental group, 1) the degree of pain was significantly decreased 2) significant improvement in the flexibility of lumbar spine, 3) uncertainty was significantly decreased. 4) Self-efficacy was not changed between the two groups after self-management course. Conclusions: These findings indicate that the self-management course could be effective in improving the flexibility of lumbar spine and decreasing pain, and uncertainty in patients with ankylosing spondylitis.