• Earthquakes and Structures
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• 제10권5호
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• pp.989-1012
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• 2016

The structural dynamic behavior and yield strength considering both ductility and strain rate effects are analyzed in this article. For the single-degree-of-freedom (SDOF) system, the relationship between the relative velocity and the strain rate response is deduced and the strain rate spectrum is presented. The ductility factor can be incorporated into the strain rate spectrum conveniently based on the constant-ductility velocity response spectrum. With the application of strain rate spectrum, it is convenient to consider the ductility and strain rate effects in engineering practice. The modal combination method, i.e., square root of the sum of the squares (SRSS) method, is employed to calculate the maximum strain rate of the elastoplastic multiple-degree-of-freedom (MDOF) system under uniform excitation. Considering the spatially varying ground motions, a new response spectrum method is developed by incorporating the ductility factor and strain rate into the conventional response spectrum method. In order to further analyze the effects of strain rate and ductility on structural dynamic behavior and yield strength, the cantilever beam (one-dimensional) and the triangular element (two-dimensional) are taken as numerical examples to calculate their seismic responses in time domain. Numerical results show that the permanent displacements with and without considering the strain rate effect are significantly different from each other. It is not only necessary in theory but also significant in engineering practice to take the ductility and strain rate effects into consideration.

• 대한안전경영과학회지
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• 제11권4호
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• pp.15-24
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• 2009

The object of this study is to understand the psychological factor of the worker on safety and recommend the experimental factor of safety education program. The following are the methods of this study. We analyzed the statistical data from survey to workers(N=139) about the psychological factor on safety. The survey consisted of 34 questions about 4 factors like private external characteristic, psychological characteristic, characteristics on behavior, and experience and reason of disaster. As the result of the analysis of the multi regression model on the base of correlation of each of the major factors, psychological health, effort on practicing, and satisfaction on their life were the variables with high influence on the safety mind of workers. So, it is good safety strategy for effective working to maintain healthy life with optimistic minds, and try to practice actively as usual. After considering the result, for the development of safety education program for working, we have to consider psychological factors of our workers that influence their safety and try to improve the experimental education opportunity, and it will be effective.

• Nutrition Research and Practice
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• 제8권6호
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• pp.719-723
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• 2014

BACKGROUND/OBJECTIVES: South Korean's sodium consumption level is more than twice the upper limit level suggested by the WHO. Steep increases in the prevalence of hypertension and cardiovascular disease in Korea necessitate more effective sodium reduction programs. This study was conducted in order to compare sodium intake-related eating behaviors and key psychosocial factors according to age group and gender. SUBJECTS/METHODS: Using an online survey, a total of 1,564 adults (20-59 years old) considered to be geographically representative of South Korea were recruited and surveyed. The major outcomes were perceived behaviors, knowledge, intentions, and self-efficacy related to sodium intake. RESULTS: The results show that perceived behavior and level of self-efficacy related to low sodium consumption differed by age and gender. Female participants showed better behavior and intention towards low sodium intake than male counterparts. Young participants in their 20s showed the lowest intention to change their current sodium intake as well as lowest self-efficacy measures. CONCLUSIONS: Future sodium reduction interventions should be developed with tailored messages targeting different age and gender groups. Specifically, interventions can be planned and implemented at the college level or for workers in their early career to increase their intention and self-efficacy as a means of preventing future health complications associated with high sodium intake.

• Nutrition Research and Practice
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• 제16권4호
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• pp.517-526
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• 2022

BACKGROUND/OBJECTIVES: The increased consumers' interests in health and food safety have increased the demand for organic foods. Many studies have been performed on consumers' purchase intentions for organic foods and their influencing factors, and various studies have shown that the prices of organic foods and the consumers' willingness to pay are important influencing factors. This study examined the payment value of organic foods and agrifood consumer competency index according to the food-related lifestyles in South Korean consumers. SUBJECTS/METHODS: A cross-sectional analysis was performed using the 2019 Consumer Behavior Survey for Food. A total of 6,176 participants aged 19 to 74 years (male: 2,783, female: 3,393) were included in the analysis. RESULTS: Three factors were extracted by factor analysis (rational consumption-seeking type, convenience-seeking type, and health, and safety-seeking type) to explain the consumers' food-related lifestyles. The results of cluster analysis suggested that consumers were classified into 3 food-related lifestyles as the 'exploratory consumers' (n = 2,485), 'safety-seeking consumers' (n = 1,544), and 'passive consumers' (n = 2,147). Exploratory consumers showed a significantly higher willingness to pay for imported organic foods (P < 0.05). Safety-seeking consumers had a significantly higher willingness to pay for domestic organic foods (P < 0.05). For the agrifood consumer competency index, exploratory consumers had the highest score, followed in order by safety-seeking consumers and passive consumers. CONCLUSIONS: These results provide basic data in understanding consumption tendency for organic foods and agrifoods based on food-related lifestyles of South Korean consumers.

• 한국재난정보학회 논문집
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• 제18권1호
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• pp.173-181
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• 2022

연구목적: 활동지원사의 안전의식과 안전행동은 시각장애인의 안전에 영향을 미칠 수 있기 때문에, 본 연구에서는 시각장애인 활동지원사들이 갖고 있는 안전의식과 안전행동에 대해 알아보고자 하였다. 연구방법:본 연구는 2021년 5월 ~ 6월까지 서울의 활동지원서비스를 제공하는 수행기관 9곳의 모집문건을 통해 참여의사를 밝히고 서면동의를 한 시각장애인 활동지원사 263명을 대상으로 하였으며, 결과분석을 위해 차이검증, 상관분석, 회귀분석을 실시하였다. 연구결과: 첫째, 소화기 실제 연습경험이 있고 재난상황의 행동요령에 대한 교육을 받은 활동지원사들이 안전의식과 안전행동이 높았다. 또한 응급구조법을 교육받은 경우 활동지원사의 생활안전의식과 소방안전의식이 높았으나 재난안전의식에서는 차이가 없었으며, 안전행동은 더 높게 나타났다. 둘째, 모든 안전의식은 안전행동과 높은 관련성을 보였다. 셋째, 시각장애인 활동지원사의 생활안전의식, 소방안전의식, 재난안전의식이 높을수록 안전행동이 높았다. 결론: 본 연구는 시각장애인이 보다 안전한 삶을 살 수 있도록 활동지원사에게 적절한 안전교육을 제공하고 안전의식을 고취시킬 수 있는 프로그램을 실시하는 것이 중요함을 밝혔다.

• 대한교통학회지
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• 제26권1호
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• pp.7-14
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• 2008

교통신호기의 설치목적 중 하나는 교통신호기를 통해 차량의 이동을 명확히 규제하여 교통사고를 사전에 방지하는데 있다. 하지만, 부적절한 신호기 위치로 인해 교차로에 접근하는 운전자가 안전운행에 필요한 행태를 나타내지 못한다면, 교통 안전도를 높이기 위한 방안으로 현장상황에 적합한 설치기준 또는 권고사항이 현장조사 및 분석을 통해서 제시되어야 할 필요가 있다. 이러한 배경에서 본 연구는 도심 신호교차로의 신호기 위치가 교차로에 접근하는 운전자의 운전행태에 미치는 영향을 분석하였다. 분석한 결과, 신호기 위치는 딜레마존을 형성하는 운전자의 감속시작지점과 접근속도에 따른 딜레마존 분포에 영향을 미치며, 더욱이 딜레마존 안전율과 밀접한 관계가 있는 것으로 나타났다. 따라서, 본 연구는 신호교차로의 교통안전도를 향상하기 위한 대안으로 교통신호기를 정지선 근처로 이설 또는 설치하는 방안을 다룬 신호기 설치운영 권고안을 제안하여 현장 활용도를 제고하고자 하였다.

• 한국환경보건학회지
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• 제30권2호
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• pp.173-183
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• 2004

The purpose of the present study was to assess food hygiene and safety knowledge, attitudes, and practices of food-service personnel in school food-service programs and to find factors affecting their knowledge, attitudes, and practices. A self-administered questionnaire was offered to a random sample of 40 kitchen employees in elementary schools in one region of Korea, with 37 completing the survey, a response rate of 92.5%. The survey was carried out over a two-month period (April-May, 2001). Knowledge score of the employees was high with a mean/standard deviation of 4.75/0.32 on a 5.0-point scale. They had significantly lower attitude score (4.55$\pm$0.33) and practice score (4.55$\pm$0.45) compared to the score of knowledge (p＜0.05). Logistic regression analysis showed that (1) the employees＇ education level and work experience in school food-service programs affected their knowledge, (2) age, level of living, monthly income, and housing type affected their attitudes, and (3) monthly income, level of living, housing type, and work experience in school food-service programs affected their practices. Pearson＇s correlation analysis confirmed that the knowledge and attitude scores were significantly correlated (r=0.598, p＜0.001). The results indicate that the knowledge, attitude, and practice levels of the employees regarding the food hygiene and safety were better than expected, however, the results suggest a need for the adoption of approaches which take account of socio-economic and environmental influences on behavior to improve and maintain their practice level. The food-handling practices of school food-service employees need to be monitored routinely in order to ensure that safe food is served to our school children.

• 보건교육건강증진학회지
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• 제20권4호
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• pp.79-93
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• 2003

Childhood injuries are the primary cause of death and disability among children aged 5 to 14. Consistent practice of learned safety behaviors can reduce the occurrence of severe injuries among children. However, safety behavior concern is low among Korean-American children specifically and American children, in general. The objective of the study is to evaluate the impact of an unintentional injury prevention curriculum, Risk Watch among Korean-American children. A quasi-experimental design with a nonequivalent control group was used for the designed of the study. Two intervention and two control Korean schools in Atlanta participated in this study. The intervention consisted of weekly lessons in traffic, bicycle, pedestrian, and fire safety. One hundred and two students completed a pre-test and a post-test. The main outcomes were safety behaviors (seat belt use or helmet use), behavioral intentions, and safety knowledge. Analysis of covariance was used for the statistical analyses. Strong intervention effects were found for increasing knowledge of all safety topics in the intervention group. Additionally, statistically significant intervention effects were detected for increasing seat belt and helmet use, as well as behavioral intentions of wearing a seat belt and wearing a helmet, among pre-kindergarten and kindergarten students. For students in grades 1 and 2, intervention effects were found for increasing helmet use. Among students in grades 3 to 8, the intervention group showed statistically significant increases for seat belt use. Limitations of the study and recommendations for modifying and supporting unintentional injury prevention programs for school children are discussed.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2002년도 봄 학술발표회 논문집
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• pp.425-430
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• 2002

This thesis is a study on behavior for anchorage zone in prestressed double T beam using strut-tie model. Stress conditions of Anchorage zone in prestressed double T beam are very disturbed because large concentrated forces act on relatively small areas. Hence, anchorage zone must be considered in Design of prestressed double T beam. If irrational design or irrational construction be conducted, that may lose stability in capacity as structure. In current design practice, certain parts of structure are designed with extreme accuracy, while anchorage zone in prestressed double T beam is designed using common sense, and experience. Therefore, it is generally very conservative. For that reason, logical, reasonable concept and accuracies are desired at design of anchorage zone in prestressed double T beam. Strut-tie method satisfies those desires. In this thesis, anchorage zone in prestressed double T beam is analyzed by considering prestressing forces. Strut-tie model is constructed based on principle stress trajectory obtained from 3D-finite element analysis in anchorage zone, and amounts of reinforcement be obtained. Results of analysis are compared with the way used in current design practice, and this thesis presents that strut-tie model can be an economical design than current design methods without losing the degree of safety.

• 해양환경안전학회지
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• 제28권4호
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• pp.587-593
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• 2022

이 연구는 해양경찰조직의 발전을 위해 해양경찰공무원이 인식하는 권한 부여 리더십이 조직시민행동과의 관계를 검증 목적으로 연구를 진행하였다. 리더십에는 다양한 유형이 있지만 해양경찰공무원은 직무 특성상 부여된 권한이 실무에서 더욱 효과적인 문제해결에 도움이 될 것이며, 비록 비공식적 행동이지만 결과적으로 조직의 발전으로 연결되는 조직시민행동은 최근 조직발전과 관련된 연구로 많이 진행된다는 점에서 접근하였다. 이 연구에서는 해양경찰공무원 168명을 대상으로 구조화된 설문지를 통해 연구가 진행되었으며 연구 결과 해양경찰공무원의 직무는 위험성, 돌발성 등으로 인해 해양경찰공무원은 상호 의존적 직무 성격이 중요하므로 중간 관리자의 목표에 대한 설명과 구성원에 대한 다양한 행동은 해양경찰 조직성과에 긍정적 결과로 연결된다는 점에서 정책적 제언을 하였다.