• Structural Engineering and Mechanics
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• 제32권3호
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• pp.459-475
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• 2009

This paper presents analytical methodologies for remaining life prediction of plain concrete structural components considering tension softening and size effects. Non-linear fracture mechanics principles (NLFM) have been used for crack growth analysis and remaining life prediction. Various tension softening models such as linear, bi-linear, tri-linear, exponential and power curve have been presented with appropriate expressions. Size effect has been accounted for by modifying the Paris law, leading to a size adjusted Paris law, which gives crack length increment per cycle as a power function of the amplitude of a size adjusted stress intensity factor (SIF). Details of tension softening effects and size effect in the computation of SIF and remaining life prediction have been presented. Numerical studies have been conducted on three point bending concrete beams under constant amplitude loading. The predicted remaining life values with the combination of tension softening & size effects are in close agreement with the corresponding experimental values available in the literature for all the tension softening models.

• Steel and Composite Structures
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• 제19권1호
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• pp.223-236
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• 2015

Despite the proliferation of the industrial application of steel tubes, the effect of collision on the surface of steel tubes subject to cyclic loading has largely remained untouched. This paper studies the fatigue behavior of steel tubes which are impacted by an external object. A dent imperfection caused by a collision was modeled and fatigue tests were conducted using a MTS machine. Fatigue life as well as the failure modes were thoroughly discussed in a way that the fatigue life of the dented tubes with similar geometrical specifications at full-scale can be generalized.

• 동아시아식생활학회지
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• 제5권3호
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• pp.339-358
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• 1995

The purpose of this study was to investigate a dietary life style of university student at campus towns and the actual condition of F&B(Food and Beverage) shop. This survey about the dietary was carried out with a variety of questionares about the life style. The subjects are 364 males and 278 females university students in Pusan area. The collected data were analyzed by SPSS Package Program. The summary of the results are as follows : The most of the subjects have a meal in-cam-pus restaurant with rice during daytime. In out-campus popular restaurant is a flouryfood restaurant and the most of subject used to go the restaurant to take a meal more than once for 2~3 days. Although a half of the subjects are satisfied with the restaurant in out-campus. Some of the subjects are unsatisfied with a price of food. A taste is the most popular criteria for selecting food in the restaurant and almost of the subjects take a meal in price 2000~2500won. Cchachangmyun is the most popular with the subject in the flouryfood restaurant, coffee is popular with the subject in the coffee shop. A half of the subjects used to go a hof house to drink, and beer is the most popular liquor with them. More than a half of the subject have a drinking at least more than once for a week in the drinking shop. A half of male subjects are able to drink more than 2,ooocc beer and more than a half of female subjects are able to drink more than 500cc beer. More than a half of the subjects want to new F&B shop to got a new experience.

• 한국품질경영학회:학술대회논문집
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• 한국품질경영학회 2009년도 추계학술대회
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• pp.176-181
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• 2009

Social networking service (SNS), which is based on the "six degree separation" theory, has gained its popularity in recent years. SNS creates a new way for maintaining relationship and sharing information over the virtual space. As a major branch, campus SNS provides a new platform for student to study as well as build and maintain inter-personal relationships. The highly realness of personal information and relatively strong group cohesion of campus SNS has turned it into an inevitable tool in students' daily life. The rapid growth of SNS in campus is creating huge academic and commercial benefits. However, little comprehensive research reveals what are determinant factors in driving students' intention to participate in campus SNS. In this paper, we conceptualize the participation of campus SNS as a social behavior and evaluate the impact made by social factors such as subjective norms and identity, as well as the impact of perceived reality and playfulness through an extended technology acceptance model.

• 한국직업건강간호학회지
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• 제25권4호
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• pp.320-328
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• 2016

Purpose: The purpose of this study was to compare the job stress, health promotion behaviors and quality of life between public health officials and general administration officials. Methods: Subjects were 60 public health officials and 71 general administration officials in G-City in Korea. Data were collected from January 25 to February 5, 2016 through self-administered questionnaires and analyzed t-test and Pearson's correlation coefficients. Results: Job stress (t=4.060 p<.001) and quality of life (t=3.963, p=.025) were significantly different between public health officials and general administration ones, while health promotion behaviors were not significantly different between these two official groups (t=0.394, p=.606) Conclusion: Results of this study suggested that it was necessary for public health officials to develop intervention program aimed at reducing job stress. Also, it would be effective to focus on improving health promotion behaviors and quality of life for them.

• 보건의료산업학회지
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• 제6권4호
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• pp.177-189
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• 2012

This study was done to identify campus life stress, self-esteem and health promotion behavior of university students and to provide basic data for the qualitative improvement of health promoting behavior of young adult. The data were obtained from distributing structured questionnaires to 491 university students in Busan. It was collected from July. 2th to the Agu. 2th of 2012, and analyzed by t-test, ANOVA, Pearson's correlation coefficient and Multiple stepwise regression. The correlation between health promotion behavior and self esteem showed to be positivity correlated(r=.180, p<.001). Also the correlation between health promotion behavior and campus life stress showed to be negativity correlated(r=-.231, p<.001). Life stress(Challenges stress) and Self-esteem were significant predictor and accounted for 13.4% of the variance in health promotion behavior of university students. Therefore it is important to develop programs that increase their self-esteem and is required to prepare a program for the development of health promoting behaviors early adult.

• Journal of Ginseng Research
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• 제41권1호
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• pp.103-112
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• 2017

Background: 20(S)-Protopanaxadiol 20-O-D-glucopyranoside, also called compound K (CK), exerts antidiabetic effects that are mediated by insulin secretion through adenosine triphosphate (ATP)-sensitive potassium ($K_{ATP}$) channels in pancreatic ${\beta}$-cells. However, the antidiabetic effects of CK may be limited because of its low bioavailability. Methods: In this study, we aimed to enhance the antidiabetic activity and lower the toxicity of CK by including it with ${\beta}$-cyclodextrin (CD) (CD-CK), and to determine whether the CD-CK compound enhanced pancreatic islet recovery, compared to CK alone, in an alloxan-induced diabetic zebrafish model. Furthermore, we confirmed the toxicity of CD-CK relative to CK alone by morphological changes, mitochondrial damage, and TdT-UTP nick end labeling (TUNEL) assays, and determined the ratio between the toxic and therapeutic dose for both compounds to verify the relative safety of CK and CD-CK. Results: The CD-CK conjugate ($EC_{50}=2.158{\mu}M$) enhanced the recovery of pancreatic islets, compared to CK alone ($EC_{50}=7.221{\mu}M$), as assessed in alloxan-induced diabetic zebrafish larvae. In addition, CD-CK ($LC_{50} =20.68{\mu}M$) was less toxic than CK alone ($LC_{50}=14.24{\mu}M$). The therapeutic index of CK and CD-CK was 1.98 and 9.58, respectively. Conclusion: The CD-CK inclusion complex enhanced the recovery of damaged pancreatic islets in diabetic zebrafish. The CD-CK inclusion complex has potential as an effective antidiabetic efficacy with lower toxicity.

• 공학교육연구
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• 제14권2호
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• pp.3-12
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• 2011

본 연구는 공학인증제도를 시행하고 있는 공과대학 편입생들의 대학생활적응과 대학생활 만족도를 살펴봄으로써 공과대학 편입생들의 대학생활에 관한 깊이 있는 이해와 편입생들의 공학인증 참여를 제고하고, 의미 있고 원만한 대학생활을 지원하기 위한 방안을 모색하는 데 그 목적을 두고 있다. 이러한 목적을 달성하기 위하여 K대학교와 D대학교의 공과대학에 편입학한 학생 193명을 대상으로 설문조사를 실시하였다. 연구결과 공과대학 편입생은 주로 일반편입학전형에 의해 편입하고 있었으며, 편입학 이후의 성적이 전적대학의 성적보다 낮 으나 편입학 이후의 학교생활에 대해서는 대체로 만족하고 있었으며, 공학인증의 참여는 저조한 것으로 나타났다. 따라서 공과대학 편입생들의 학교생활 적응과 공학인증참여를 제고하기 위한 노력이 필요하다고 판단된다. 또한 학교생활만족도에서 남학생이 여학생보다 교육성과측면에서의 만족도가 높았고, 전적대학에서 성적이 좋은 학생들이 편입학 이후의 학교생활에 더 잘 적응하고 있으며 그에 따라 만족도도 높은 것으로 나타났다. 따라서 편입 여학생들의 학교생활 적응을 위한 지원을 좀 더 적극적으로 할 필요가 있으며, 편입생들의 학교생활 만족도 제고를 위한 지원 노력이 필요하다고 판단된다.

• 한국산학기술학회논문지
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• 제22권3호
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• pp.101-109
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• 2021

본 연구는 간호 대학생의 게임중독, 자기효능감이 대학생활적응에 영향을 미치는 요인을 파악하고자 실시하였다. 본 연구대상자는 국내 간호대학 7곳에 재학 중인 학생 182명을 대상으로 하였으며, 자료 수집은 2019년 9월 20일부터 10월 3일까지 실시되었다. 자료분석은 SPSS 26.0 프로그램을 이용하였으며, 빈도와 백분율, 평균과 표준편차, t-test, ANOVA, Pearson's correlation, stepwise multiple regression으로 분석하였다. 연구결과 간호대학생의 게임중독은 1.14±.30점(4점 만점), 자기효능감은 3.39±.55점(5점 만점), 대학생활적응은 3.18±.57점(5점 만점)으로 나타났다. 대상자의 게임 중독, 자기효능감, 대학생활적응의 상관관계를 본 결과 자기효능감은 게임중독과 음의 상관관계를 보였다(r=-.148, p=.046). 자기효능감은 대학생활적응과 통계적으로 유의한 정적 상관관계를 보였으며(r=.649, p<.001), 대학생활적응은 게임중독과 음의 상관관계를 보였다(r=-.220, p=.003). 대상자의 대학생활적응에 영향을 미치는 요인을 파악하기 위하여 단계적 다중회귀분석을 실시한 결과 자기효능감(��=.588, p<.001), 성별(��=.183, p=.001), 게임중독(��=-.152, p=.007)이 통계적으로 유의한 영향 관계를 보였다. 모형의 설명력은 45.9%였으며(F=52.197, p<.001), 대학생활적응에 가장 많은 영향을 미치는 요인은 자기효능감으로 나타났다. 이상의 연구 결과로 보아 효과적인 대학생활적응을 위해서는 게임중독을 예방하고 자기효능감을 높이기 위한 프로그램 개발이 요구된다.

• 보건교육건강증진학회지
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• 제32권4호
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• pp.25-35
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• 2015

Objectives: Health behaviors among young people group are strongly linked to healthy habit or life style in adulthood. This study performed to explore the essential components and effective strategies to develop the standardized program on healthy campus that could contribute to health status and sustainable health promotion among students, faculty, and staff in university health. Methods: To set up the priority and weighting of essential components and strategies on health promoting university, thirty one professionals who had majored in health promotion were selected for Delphi in Oct. 2011. Results: Barriers to success of the health promoting university were lack of interest and policies, incomplete process of health planning, absence of health-related personnel, and inadequate action plan. Essential components of healthy campus were raising fund, healthy policy, participation, human resource, and health promotion programs. Effective strategies were expanding of health promotion programs to improve lifestyle, improvement of campus environment, planning of healthy campus, development of infrastructure, and building up a healthy and safety campus. Conclusions: Health promoting university services support to achieve academic goal of student and helps to reduce absenteeism of university faculty and staff through the on-campus services that are accessible, student-focused, cost-effective, and high quality.