• Journal of Preventive Medicine and Public Health
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• v.45 no.1
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• pp.8-13
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• 2012

Objectives: Recently injury has become a major world-wide health problem. But studies in Korea about injuries were very few. Thus, this study was conducted to analyze the trend of major injuries from 1991 to 2006 and to provide basic data for preventing injuries. Methods: This study was based on the National Statistical Office data from 1991 to 2006 and calculated to estimate the burden of major injuries by using the standard expected years of life lost (SEYLL) and total lost earnings equation. Results: For transport accidents, mortality, SEYLL and total lost earnings were increased from 1991 to 1996 and decreased from 2000 to 2006. On the other hand, for suicides, these were increased gradually. Since 2003, falls were included in ten leading causes of death. This study showed that injury causes major social and economical losses. Conclusions: We could reduce injury related premature death through active interest in injury prevention program.

• Journal of Fashion Business
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• v.6 no.4
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• pp.62-82
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• 2002

The purpose of this study was to investigate the Avant-garde's aesthetic values and expressoinal characteristic, and to find out(analysis) the design characteristic of Avant garde fashion since 1995. Expressoinal characteristics of Avant garde with the anti-aesthetic, radically pursuing newness, and open mind, are revealed dynamism, hostile innovation, and experimentalism. Futuristic images expressed in dynamism represent space style, body conscious style, cyborg style, kinetic style, and primitive style. And deconstructional images related to hostile innovation show punk style, grunge style, humor style, and abstractive style. Also surreal images related to experimentalism hold erotic style, depasemant style, deformation style, and collage style. The proper usage of newness offers the escape, the vividness, and the humour from the fatigue of the life and so, it is expected to offer the chance of transfering the active individuals and societies directly or indirectly By analyzing the instances for the images of avant-garde fashion since 1995, the contribution about the expectation of the design trends of the present and future is expected.

• KOREAN JOURNAL OF PACKAGING SCIENCE & TECHNOLOGY
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• v.28 no.1
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• pp.39-46
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• 2022

This study compared the effects of cocopeat and perlite growth media on the storability and quality of sweet pepper fruit stored using modified atmosphere packages (MAP) and carton boxes. The fruits were stored at 8℃ for 35 and 30 days, respectively. Perlite-grown fruits had a significantly lower size at harvest due to the medium's inability to hold plenty of water during the growing stage. Contrary to what is expected for small fruits, the result shows box-stored perlite-grown fruits to have lower weight loss and a longer shelf life than cocopeat-grown fruits, while MAP fruits have indifference. Perlite fruits also had a higher quality in terms of dry matter, soluble solids, and vitamin C, while box-stored fruits had a better visual quality. As expected, respiration and ethylene production rates were high, and fruits had similar after-storage firmness values. Based on the findings, perlite-grown sweet pepper fruits may have a better quality and give preference in a box storage condition.

• Elastomers and Composites
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• v.52 no.4
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• pp.237-241
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• 2017

The tensile strength (TS) and elongation-at-break (EB) loss of a CR/CB rubber composite sample prepared for the automotive parts were measured after accelerated thermal ageing at temperatures of 100, 120, 140, and $150^{\circ}C$. The change in TS was observed to be linear from the master curve prepared using the time-temperature superposition-principle (TTSP). An Arrhenius type of shift factor, $a_T$ was used to predict the life time of the sample, and a plot of ln $a_T$ vs. 1/T was also shown to be linear. The activation energy ($E_a$) of the sample was calculated as 70.30 kJ/mole from the Arrhenius plot. The expected life time of the sample was predicted at the given operating conditions by applying Arrhenius analysis. Assuming the $E_a$ value was constant at lower operating condition, life time of the sample was calculated as 2.3 years when the life limit was set as time to reach the 20% decrease of the initial TS value at operating temperature of $40^{\circ}C$.

• Journal of Advanced Marine Engineering and Technology
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• v.40 no.1
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• pp.10-16
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• 2016

Fatigue analysis for life extension of a ship is different from that of a newly constructed ship since the current corrosion margin and voyage routes of the past and future must be considered, thereby complicating the life extension procedure. This research introduces the fatigue analysis case for the life extension project of a moss LNG carrier using full spectral fatigue analysis, which has been previously used for newly constructed ships. It is expected that the fatigue analysis methodologies and full spectral fatigue analysis program used in this study will be applicable to other life extension projects.

• Transactions of the Korean Society of Automotive Engineers
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• v.18 no.6
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• pp.38-45
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• 2010

Welding structures are designed to endure its expected life. The most important factors are life. Especially on welded structure, fatigue strength is critical. So this study performed a research on Box and T shape weldment specimen to examine the influence of welding type. In this experiment, the results indicate Box shape was available in more than T shape. Fatigue tests were performed to evaluate the fatigue strength of the both as-welded and statically pre-loaded specimens by 3 point bending load. Fatigue life can be improved by using Ultrasonic Impact Treatment(UIT) effect. Ultrasonic Impact Treatment(UIT) is excellent for eliminating the tensile residual stresses and generating compressive residual stresses which elevate fatigue strength of welded structures. Also, this shows that welding part has better fatigue life and welding was performed well. In this study, to evaluate the Ultrasonic Impact Treatment(UIT) effect, for welding structure, the experiment was conducted at various levels of stress range between 100MPa and 500MPa. From the test results, it was indicated that fatigue performance was improving by Ultrasonic Impact Treatment(UIT)

• Smart Structures and Systems
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• v.4 no.5
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• pp.641-653
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• 2008

This paper proposes a practical and realistic method to establish an optimal lifetime maintenance strategy for deteriorating bridges by considering the life-cycle performance as well as the life-cycle cost. The proposed method offers a set of optimal tradeoff maintenance scenarios among other conflicting objectives, such as minimizing cost and maximizing performance. A genetic algorithm is used to generate a set of maintenance scenarios that is a multi-objective combinatorial optimization problem related to the lifetime performance and the life-cycle cost as separate objective functions. A computer program, which generates optimal maintenance scenarios, was developed based on the proposed method using the life-cycle costs and the performance of bridges. The subordinate relation between bridge members has been considered to decide optimal maintenance sequence and a corresponding algorithm has been implemented into the program. The developed program has been used to present a procedure for finding an optimal maintenance scenario for steel-girder bridges on the Korean National Road. Through this bridge maintenance scenario analysis, it is expected that the developed method and program can be effectively used to allow bridge managers an optimal maintenance strategy satisfying various constraints and requirements.

• Journal of the Korean Society of School Health
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• v.27 no.2
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• pp.80-89
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• 2014

Purpose: The purpose of this study is to analyze the correlation between obesity stress, self-esteem, and adaptation to school life according to body mass index of elementary school students in higher grades and to provide basic data for the development of health education programs. Methods: A convenience sampling method was used to select four elementary schools. Self-reporting questionnaires were distributed to the subjects to collect data, which were then analyzed using the SPSS 18.0 program. Results: The higher the obesity index, the more obesity stress the students experienced. Second, the lower the level of obesity, the higher both self-esteem and the level of adjustment to school life were. There was a meaningful correlation between obesity stress, self-esteem, and adjustment to school life. Conclusion: The study results are expected to be useful in serving as a basic material for the development of programs that can improve students' adjustment to school life and self-esteem while reducing their stress caused by obesity.

• Structural Engineering and Mechanics
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• v.31 no.1
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• pp.11-24
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• 2009

In China, the oil and natural gas resources of Bohai Bay are mainly marginal oil fields. It is necessary to build both ice-resistant and economical offshore platforms. However, risk is involved in the design, construction, utilization, maintenance of offshore platforms as uncertain events may occur within the life-cycle of a platform under the extreme ice load. In this study, the optimum design model of the expected life-cycle cost for ice-resistant platforms based on cost-effectiveness criterion is proposed. Multiple performance demands of the structure, facilities and crew members, associated with the failure assessment criteria and evaluation functions of costs of construction, consequences of structural failure modes including damage, revenue loss, death and injury as well as discounting cost over time are considered. An efficient approximate method of the global reliability analysis for the offshore platforms is provided, which converts the implicit nonlinear performance function in the conventional reliability analysis to linear explicit one. The proposed life-cycle optimum design formula are applied to a typical ice-resistant platform in Bohai Bay, and the results demonstrate that the life-cycle cost-effective optimum design model is more rational compared to the conventional design.

• Journal of Korean society of Dental Hygiene
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• v.20 no.2
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• pp.209-220
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• 2020

Objectives: Although dental hygienists have a high employment rate as professional workers, turnover and retirement rates are very high. This study analyzed the factors related to work life of dental hygienists to prepare an alternative for life extension. Methods: From August 1 to December 31, 2019, 224 dental hygienists and 446 dental hygiene students were examined. Results: The expected working years for dental hygienists were 10-14 years (25.4%) and over 31 years (22.4%) for dental hygiene students. The recognized working years for dental hygienists were 10-14 years (22.4%) and 20-24 years (26.0%) for dental hygiene students. Work values of dental hygienists and dental hygiene students averaged 3.85 and 3.86, respectively. Furthermore, the average motive for selecting a major in dental hygienists was 3.08 points and in dental hygiene students, 3.24 points. The average career identity of dental hygienists and dental hygiene students were 2.82 and 2.91 points, respectively. Conclusions: The perception difference between dental hygienists and dental hygiene students was compared, and the factors that could play a positive role in prolonging life were identified. Based on this study, further systematic comparative studies and preparation of alternatives for life extension are required.