• Journal of the Korean Professional Engineers Association
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• v.44 no.5
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• pp.36-41
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• 2011

Design of blast resistant structures (protective structures) require the adequate design and construction practices as well as the knowledge of characteristics of the blast loads, behavior of structures and their components under these loads. This paper focuses on how to design and evaluate the structures for blast resistance, and provides principles and discussion on analysis and design capability in protective technology and recommendations.

• Korean Journal of Child Studies
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• v.19 no.2
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• pp.49-64
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• 1998

The theoretical process model was used to study problem behavior of children growing up at-risk. A sample of 339 children living in at-risk families were selected from among 2, 134 children in grades 4, 5, and 6 of five elementary schools in Seoul. The instruments were five risk factor scales and four protective factor scales. The Child Behavior Checklist was also used. The results of the hypothetical model of children at-risk showed that the factor of socioeconomic status led to positive child rearing attitudes in mothers, which is turn influenced children's problem behavior indirectly. In contrast, stressful life events and mother's depression influenced children's problem behavior directly. However, negative family functioning, marital discord and father's depression did not influence mother's child rearing attitudes or children's problem behavior. Mother's child rearing attitudes directly influenced children's social competence and academic achievement and indirectly influenced their problem behavior. Academic achievement did not influence problem behavior directly, but social competence influenced it directly. Mother's child rearing attitude was the most significant factor affecting children's adaptation.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.29 no.3
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• pp.81-87
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• 2015

In order to effectively protect electrical and electronic circuits which are extremely susceptible to lightning surges, multi-stage surge protection circuits are required. This paper presents the operational characteristics of the two-stage hybrid surge protection circuit in extra-low voltage DC power lines. The hybrid surge protective device consists of the gas discharge tube, transient voltage suppressor, and series inductor. The response characteristics of the proposed hybrid surge protective device to combination waves were investigated. As a result, the proposed two-stage surge protective device to combination wave provides the tight clamping level of less than 50V. The firing of the gas discharge tube to lightning surges depends on the de-coupling inductance and the rate-of-change of the current flowing through the transient voltage suppressor. The coordination between the upstream and downstream components of the hybrid surge protective device was satisfactorily achieved. The inductance of a de-coupler in surge protective circuits for low-voltage DC power lines, relative to a resistance, is sufficiently effective. The voltage drop and power loss due to the proposed surge protective device are ignored during normal operation of the systems.

• Journal of the Korean Society of Clothing and Textiles
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• v.28 no.910
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• pp.1292-1299
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• 2004

This survey was carried out on 256 smallholder farmers of the Jeonbuk Province to analyze their current behavior in pesticide usage and the use of protective clothing during spray work. The interviewees were at the age of about 50's in both males and females: they performed spray work mainly for their own farms. Many of them were not very well aware of the danger of pesticides and the adequate methods of pesticide handling. Water drinking and smoking during break time were the endangering factors of pesticide intoxication, reaching to 30-60% sprayers. Most of sprayers had experienced the exposures to pesticides during spray work and appealed some subjective clinical symptoms to the exposure, but they seldom sought medical treatments. More than 70% of respondents had not been wearing protective equipments during spray work. The results will be used as basic information in designing the improved protective clothing more acceptable by pesticide sprayers.

• Journal of the Korean Society of Clothing and Textiles
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• v.29 no.8 s.145
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• pp.1136-1145
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• 2005

The objective of this study was to determine factors affecting sun protective behavior and intention to buy UV protective clothing among outdoor sport persons in Korea. A self-administered questionnaire was distributed to mountain climbers, bikers and in-line skaters with a convenience sampling method. Two theoretical frameworks, health belief(HB) model and diffusion theory(DT) were used for the study. Based on HB model, sun protection behaviors(SPBs) were associated with cancer perception, perceived benefits, behavioral barriers and cues to actions based on the HB model. Based on DT model, intention to buy (ITB) was determined by an individual's perceived attributes of UV protective shirt. Appearance concern variables were added to the extended HB model. The extended DT model was proposed by adding the variables in the HB model and variables of appearance concern. Multiple regression analysis was applied. Results were as follows. First, perceived benefits, behavioral barriers, cues to action, and all three appearance concern variables as well as gender and age were significant determinants of SPB for Korean outdoor consumers. Second, relative advantage, compatibility, friability, behavioral barriers and cues to action with some appearance concern variables were significant in affecting intention to buy UV protective clothes. Extended HB model and extended DT model were useful to understand SPBs of Korean outdoor consumers.

• Korean Journal of Human Ecology
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• v.18 no.6
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• pp.1199-1208
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• 2009

The purpose of this study was to understand a mother's parenting behavior and home environment in relation to the stress of a male child. The subjects were 200 mothers of 4-6 years old children in early childhood programs located in Seoul and Gyeonggi province. Instruments used in this study were the Mother's Parenting Behavior Scale (Park Seong Yeon & Lee Suk, 1990), Home Scale (Jang Yeong Ae, 1981), and Children's Usual Stress Scale (Yeom Hyeon Gyeong, 1998). Data was analyzed by descriptive statistics, Pearson's correlation, and multiple regression analysis. Results indicated that (a) stress was shown to be higher if the mother's parenting behavior was authoritarian and over-protective, (b) children of lower economic background showed a higher stress level than middle and upper economic background subjects, and (c) the mother's educational background, authoritarian and over-protective parenting behavior and quality of the family background were meaningful variables for children's stress.

• Korean Journal of Child Studies
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• v.29 no.2
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• pp.109-124
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• 2008

The objective of this study was to identify how child's gender, temperament, mother's stress and their interactions predict parenting behavior. The subjects were 97 2-year-olds(47boys; 50girls) and their mothers. Data were gathered by questionnaires. Results of a series of hierarchical regression analyses showed combinations of variables that predicted parenting behaviors : (1) mothers reported higher over-protectiveness toward girls and when they were under higher stress. (2) An interaction effect showed that mothers with sons who had higher 'difficult' temperaments reported greater over-protective parenting under greater stress. (3) There were no significant differences in over-protective parenting under low stress, regardless of the level of difficult temperament. (4) Mother's stress was a strong predictor of supportive parenting behaviors.

• Korean Journal of Human Ecology
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• v.18 no.4
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• pp.903-912
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• 2009

The purpose of this study was to analyze potential effects of Koreans' ultraviolet risk awareness and appearance management on their UV protective behaviors in daily life and outdoor activities, and was to investigate in their awareness of UV-protective clothing and their purchase attitudes toward anti-UV protective clothing. To meet the above goals, we have surveyed a total of 262 participants(male and female) residing in Chungcheong province. Findings were as following: As a part of ultraviolet-protective behaviors, it was found that the respondents often relied on applying sun-block cream or shady place before exposition to sunlight. Particularly, it was notable that 30's or older group was more proactive in UV protective behaviors than younger group below 30 years old. There were significant correlations among the respondents' UV protective behaviors, their awareness of anti-UV clothing and their purchase attitudes to anti-UV clothing. Also, there were also significant correlations among their UV-protective means for outdoor activities. That is, more favorable awareness about anti-UV clothing they have is associated with their more active attitudes to purchasing anti-UV clothing and taking anti-sunlight behaviors. It was found that the number of respondents who used cosmetics for outdoor activities was more than that of respondents who used clothing to protect their body from ultraviolet ray. Hence, it will be necessary for follow-up studies to focus on the development and promotion of anti-UV clothing.

• Journal of the Korean Home Economics Association
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• v.46 no.8
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• pp.1-15
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• 2008

This study explored adjustment of school-aged children from low-income divorced families. Specifically, protective factors for children's self-perceived competence and behavior problems were investigated with children's coping strategies, perceived social support, parents' childrearing style, and parental stress. Subjects of this study were 126 children of 4 to 6 grade and their custodial parents(38 fathers, 88 mothers) from divorced families. Children's self-perceived competence and behavior problems were not different neither by children's sex nor custodial parent's sex. When children used more positive and less negative coping strategies, and when parents experienced less childrearing stress, children perceived themselves to be more competent. Similarly, when children used more positive and less negative coping strategies, received more social support, they perceived themselves to be more adequate. Children whose parents had high levels of childrearing stress showed more internalized and externalized behavior problems. Furthermore, children who perceived less supports from peers showed more behavior problems.

• Progress in Superconductivity and Cryogenics
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• v.11 no.3
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• pp.35-39
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• 2009

The study for a protective relay system is one of the important technical issues on the power system application of Superconducting Fault Current Limiter (SFCL). We used Real Time Digital Simulator(RTDS) to study the true interaction of the protection system with the power system. RTDS modeling of SFCL is necessary to the detailed protective relay tests. In this paper, we developed an analysis model using RTDS for studying the transient behavior of 22.9kV SFCL and carried out closed-loop testing of protective relays in distribution power system with the developed SFCL model. The SFCL model has the operation mechanism of 22.9kV hybrid SFCL being developed by LSIS and KEPRI in Korea. The parameters of the model are based on the test data of the real SFCL. Power system planners and operators can solve the expected problems in power system application of SFCL using protective relay testing results.