• 한국철도학회:학술대회논문집
• /
• 한국철도학회 2001년도 추계학술대회 논문집
• /
• pp.139.1-146
• /
• 2001

Contact lines are necessary to supply electric locomotives with electric power. As most railways are gradually electrified with modernized electric cars, the demand for catenary wires and their facilities are also increased. Catenary wires made by metallic materials are generally used in the open air. They are exposed to the marine area with air-borne salt or severely polluted industrial area with much corrosive emission gases depending on the railway locations. In urban area, acid rain may cause a degradation of catenary wire system. Corrosion of catenary wires can make their actual lifetime shorter than that originally designed. Thus, the messenger wires, a kind of catenary wire system, were investigated with respect to corrosion, which include new and the used one collected at the field. They are also vibrated with some amplitude everytime the train passes through the railway. The frequent cyclic load on the wire any result in a fatigue damage, Surface damage by corrosion can make fatigue crack initiate with ease. In the present study, the fatigue life of the used wire was measured 40 to 50% shorter than that of new one in average.

• 한국응급구조학회지
• /
• 제18권2호
• /
• pp.45-58
• /
• 2014

Purpose: This study aimed to investigate the level of knowledge and education regarding basic life support (BLS) among scuba divers. Methods: Data collected from 125 scuba divers in Jeju-do were subjected to frequency, t-test, ANOVA, and Chi-square analyses using the SPSS 18.0 program. Results: 42.1% of the subjects was trained BLS for more than an hour less than 4 hours, and 52.6% of the subjects was trained BLS for less than 3 months in scuba diving institutions. Statistically significant difference was observed in the competence for performing cardiopulmonary resuscitation during BLS education according to gender and age further regarding the necessity of BLS education, significant difference was observed with respect to age, job, academic background, monthly income, and participation period of scuba divers. The divers wished to learn cardiopulmonary resuscitation (72.8%), medical first aid (8.0%), and measures to be taken in cases of trauma (8.0%). The knowledge score for BLS among scuba divers was significantly different depending on the gender, age, marital status and frequency of participation. Conclusion: It is necessary to develop and implement a safety education program for scuba divers.

• 가족자원경영과 정책
• /
• 제17권2호
• /
• pp.121-145
• /
• 2013

The purpose of this study is to understand married female immigrants' life adjustment process in Korea by explaining the resources to which they have access and how they use them. The data were collected through in-depth interviews with ten female participants who have more than one child, have participated in programs of the multicultural family support center, have work experience, can communicate with Koreans, and live in Daegu. The major findings are as follows. The participants' personal resources differed. English language skills were very useful resources for making money and for earning the respect of family members and others. However, the participants without English language skills had sincerely and actively tried to learn the Korean language and gain bilingual competence. The participants obtained diverse family resources from their husbands and parents-in-law after adapting themselves to perform their gender role. Further, the participants used the social resources offered by public support systems as a starting point for learning the Korean language in their early adaptation process, and formed personal networks with staff members at the multicultural family support center. The results show that the participants used many kinds of resources for acculturation by interacting positively with their environment. Moreover, the resources from diverse levels of their environments affected their acculturation process.

• 한국콘텐츠학회논문지
• /
• 제15권2호
• /
• pp.552-566
• /
• 2015

이 논문은 오늘날 우리 사회는 물론 전 세계적으로 심각한 사회적 문제로 대두되는 자살을 기독교적 입장에서 다루고 있다. 자살에 대한 역사적인 입장은 용감하고 명예로운 것으로 생각하는 찬성과 신이 부여한 생명을 버리는 것은 옳지 않다는 반대로 나눠진다. 성경의 자살은 대부분 명예자살이지만 아우구스티누스의 사상의 영향으로 기독교 내에서 부정적으로 자리 잡다가 급기야 '자살자는 지옥행'이라는 생각에까지 이르게 되었다. 그렇다면 왜 사람들은 자살을 할까? 자살의 원인에 대한 학자들의 견해는 대략 생물학적 원인, 정신과적 원인, 그리고 사회학적 원인의 세 부류로 나뉜다. 논자는 이들 각각 혹은 복합적으로 자살에 기여한 것을 인정하면서도 결국은 이들에 대한 개인의 대응이 결정적 요인이라는 입장을 취했다. 자기 해석적 존재인 인간이 자신의 절망적 현 상황을 어떻게 받아들이느냐가 자살의 주된 요인으로 작용한다는 것이다. 이런 이해에 기초하여 논자는 자살 문제에 대한 본질적 해결책으로 자살에 대한 세 가지 새로운 인식과 실제적 제안을 제시함으로써 논문을 매듭지었다. 첫째, 인간의 생명은 하나님의 형상으로 지음 받았고, 하나님께 속한 고귀한 것이란 인식이 필요하다. 둘째, 기독교는 인간이 궁극적으로 영원한 생명이라는 희망의 미래를 조망할 수 있는 존재라는 인식이 필요하다. 셋째, 자살은 살인 금지규정에 대한 위반이지만 범죄행위라기보다는 치료가 필요한 질병이라는 인식의 확산 역시 필요하다. 이 일을 위해 기독교가 실제적으로 할 수 있는 것은 생명존중사상을 확산하는 캠페인을 진행할 뿐 아니라, 자살예방센터를 초 교파적으로 각 지역에서 운영하는 것이다.

• Nuclear Engineering and Technology
• /
• 제54권5호
• /
• pp.1588-1596
• /
• 2022

In the nuclear power plants, stainless steel is widely used for fabrication of various components such as piping and pipe fittings. These piping components are subjected to cyclic loading due to start up and shut down of the nuclear power plants. The application of cyclic loading may lead to initiation of crack at stress raiser locations such as nozzle to piping connection, crown of piping bends etc. of the piping system. Crack initiation can also take place from the flaws which have gone unnoticed during manufacturing. Therefore, prediction of crack initiation life would help in decision making with respect to plant operational life. The primary objective of the present study is to compile various analytical models to predict the crack initiation life of the pipes with notch. Here notch simulates the stress raisers in the piping system. As a part of the study, Coffin-Manson equations have been benchmarked to predict the crack initiation life of pipe with notch. Analytical models proposed by Zheng et al. [1], Singh et al. [2], Yang Dong et al. [25], Masayuki et al. [33] and Liu et al. [3] were compiled to predict the crack initiation life of SA312 Type 304LN stainless steel pipe with notch under fatigue loading. Tensile and low cycle fatigue properties were evaluated for the same lot of SA312 Type 304LN stainless steel as that of pipe test. The predicted crack initiation lives by different models were compared with the experimental results of three pipes under different frequencies and loading conditions. It was observed that the predicted crack initiation life is in very good agreement with experimental results with maximum difference of ±10.0%.

• 대한통합의학회지
• /
• 제10권4호
• /
• pp.153-163
• /
• 2022

Purpose : The purpose of this study was to investigate the differences between uncertainty of chronic diseases and quality of life with regard to elderly people. Methods : The participants of this study were 350 elderly people, aged over 65 years. The collected data were analyzed using the SPSS Window program and the general characteristics of the participants and sub-domains of quality of life were analyzed by several frequency analyses and descriptive statistics such as mean, standard deviation, skewness, and kurtosis. Further, the differences between the sub-domains of uncertainty and sub-domains of quality of life were analyzed through independent t-test and one-way ANOVA. In order to reach conclusive results, post-test was analyzed by the Scheffe test. In addition, Pearson's correlation analysis was performed to determine the correlation between the target categories. A significance level of 𝛼=.05 was used to verify statistical significance. Results : As a result of examining "uncertainty" with respect to general characteristics, such as older age, low educational background, and chronic diseases, it was observed that the more intense these factors became, the more the level of uncertainty increased. In addition, it was also noted that except "accompanying diseases" in social domain, the participants enjoyed a high level of quality of life. The correlation was noted between domains of complexity and sociality (p<.01), domains of inconsistency and sociality (p<.01), domains of complexity and living environment (p<.01), domains of inconsistency and living environment (p<.01), and total score of uncertainty and total quality of life (p<.01). Conclusion : In this study, differences were found between "uncertainty" and "quality of life" of elderly people; the correlation between the sub-domains based on general traits was found to be negative (-). This suggests that objective evidence can be presented for the prevention of diseases by using mental health programs for the elderly in future.

• Mycobiology
• /
• 제43권3호
• /
• pp.280-287
• /
• 2015

In this study, transcriptome analysis of twelve laccase genes in Pleurotus ostreatus revealed that their expression was differentially regulated at different developmental stages. Lacc5 and Lacc12 were specifically expressed in fruiting bodies and primordia, respectively, whereas Lacc6 was expressed at all developmental stages. Lacc1 and Lacc3 were specific to the mycelial stage in solid medium. In order to investigate their biochemical characteristics, these laccases were heterologously expressed in Pichia pastoris using the pPICHOLI-2 expression vector. Expression of the laccases was facilitated by intermittent addition of methanol as an inducer and sole carbon source, in order to reduce the toxic effects associated with high methanol concentration. The highest expression was observed when the recombinant yeast cells were grown for 5 days at $15^{\circ}C$ with intermittent addition of 1% methanol at a 12-hr interval. Investigation of enzyme kinetics using 2,2-azino-bis(3-ethylbenzothiazoline-6-sulfonic acid (ABTS) as a substrate revealed that the primordium-specific laccase Lacc12 was 5.4-fold less active than Lacc6 at low substrate concentration with respect to ABTS oxidation activity. The optimal pH and temperature of Lacc12 were 0.5 pH units and $5^{\circ}C$higher than those of Lacc6. Lacc12 showed maximal activity at pH 3.5 and $50^{\circ}C$, which may reflect the physiological conditions at the primordiation stage.

• 대한가정학회지
• /
• 제37권12호
• /
• pp.153-168
• /
• 1999

With rapid changes in modern societies, abrupt increases in knowledges and fast conversions in technologies have caused serious generation gaps among members of the family. This have generated problems for housewives who is generally in charge of maintaining and coordinating a family with limited life experiences and knowledges earned only through several years of school education, to resolve every problems evoked in their families. This has made us to realize the needs for the education related to the family life. Especially for middle-aged housewives, this type of education is absolutely required to maintain ideal family relationships, and this can be accomplished by improving their abilities and potentials. The 8-step program to improve the relationship between middle-aged housewives and their children was developed. Overall, this program improved the self-respect and psychological well-being of middle-aged housewives. Also, the relationship with their children was greatly improved through better understanding and communication. This was solely reflected on the quantitative evaluations through pre-and post-tests, so that all the participants scored higher in the post-test.

• 가정과삶의질연구
• /
• 제24권3호
• /
• pp.83-94
• /
• 2006

In order to understand how consumers' buying motivation is formed, that is the starting point of consumer behavior or consumers' decision-making processes, we examined how the interpersonal orientation for consumers is organized to control buying motivation and create a stepping-stone for subjects' behavior in fast varied consumer environments. In addition, we examined what influence this interpersonal orientation has on consumers' buying motivations. The results are shown as follows: First, interpersonal orientation is classified into six categories, according to Cohen's three types, i.e., compliance, detachment I: emotion independence, detachment II: performance independence, detachment III: perception independence, aggressiveness I: competitiveness, aggressiveness II: aggressiveness. Second, based on our inspection of the relation between interpersonal orientation and consumers' buying motivations, for external motivation and internal motivation, the value of R2 in regression seems too low to act as an influencing power on interpersonal orientation, while in case of introjected motivation, identified motivation I: self respect, and identified II: pursuit of harmony, I there seems to be some relationship.

• 한국건축시공학회지
• /
• 제18권6호
• /
• pp.603-609
• /
• 2018

우리나라의 경제성장 수준에 비하여 삶의 질 수준은 낮은 것으로 알려져 있다. 특히, 건축공사 현장관리자들은 건설업의 특성상 이른 출근시간과 적은 휴일로 인하여 타 직종과 비교하였을 때 삶의 질 수준이 낮은 것으로 나타났다. 본 연구는 건축공사 현장관리자의 워라밸 향상에 대한 요구사항을 분석하는 것을 목적으로 하였다. 이를 위해 설문조사를 통해 현장관리자의 근로실태와 워라밸을 분석하였다. 연구 결과, 건축공사 현장관리자들의 근로시간은 길고, 여가시간은 짧은 것으로 나타났다. 워라밸 향상에 대한 요구사항은 여가시간, 근로시간, 임금, 직업안정성 순으로 높게 나타났다. 집단별 요구사항의 차이는 '과장, 차장' 직급에서 근로시간 단축에 대한 요구가 가장 높게 나타났고, '부장 이상' 에서 가장 낮게 나타났다. 본 연구결과는 건설현장관리자들의 워라밸 향상을 위한 정부나 건설회사의 정책방향 설정을 위한 기초자료로 활용될 수 있을 것으로 기대된다.