• Asia-Pacific Journal of Business Venturing and Entrepreneurship
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• v.12 no.6
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• pp.79-88
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• 2017

Personal time perspective is a factor influencing motivation and goal-oriented behavior. The start-up process is a preparatory process for the future rather than the present. There will be a difference in entrepreneurial decision making depending on the level of time perspective. This study verified the relationship between individual 's time perspective and entrepreneurial self-efficacy. For this study, a survey was conducted with 190 students in college. To test the hypothesis, t-test, one-way analysis of variance and correlation analysis were used. The results of the study are as follows. First, we analyzed the difference of individual 's time by past-negative, past-positive, present-fatalistic, present-hedonistic, and future-oriented time. As a result of analysis, the more experience of entrepreneurship education, the higher the present-fatalistic, present-hedonistic, and future-oriented level. Second, the effect of individual's time perspective on entrepreneurial self-efficacy was analyzed. The past-negative and present-fatalistic level influenced negative on entrepreneurial self-efficacy. The present-hedonistic and future-oriented level influenced positive on entrepreneurial self-efficacy. Finally, based on the above results, academic significance, implications and limitations are suggested.

• The Journal of the Korea Contents Association
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• v.22 no.10
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• pp.114-131
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• 2022

The goal of this study is to examine the impact of time perspective and life satisfaction of government and public institution employees on organizational SNS attitude and word-of-mouth effect. A total of 136 incumbent employees participated in this online survey. It was found that past-positive, present-hedonistic, and future time perspective positively affected life satisfaction and the organizational SNS attitude. Meanwhile past-negative time perspective negatively affected life satisfaction only, present-fatalistic time perspective did not negatively affect life satisfaction and organizational SNS attitude. Finally, life satisfaction showed a positive impact on word-of-mouth effect via organizational SNS attitude. By identifying psychological underpinnings of time perspective and life satisfaction, this study will provide theoretical and practical implications regarding internal communication and the effective management of government and public institution-operated SNS.

• The Korean Journal of Zoology
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• v.29 no.1
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• pp.13-22
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• 1986

In order to investigate the 'In Vitro 2-Cell Block' phenomenon found in certain mouse strains such as ICR, the present studies have been done. Fertilized eggs (1-cell) and 2-cell embryos recovered from the oviducts of the ICR mouse at the various time intervals after hCG injection to induce ovulation were cultured for 3 or 4 days to examine the capability for further cleavage beyond 2-cell stage. Consequently, it was found that some proportions of the 1-cell or 2-cell embryos recovered at 30 hours post hCG showed their cleaving capability and if the embryos were obtained after 48 hours of hCG injection, they were all at 2-cell stage and most of them developed to the blastocysts in vitro. It was also found that the embryos obtained at 27 hours post hCG showed their stronger capacity of further development in the groups cultured for shorter period than 24 hours in vitro before transferring to the oviduct. Based on the results, it can be inferred that mouse fertilized eggs should be remained inside the oviduct for a certain length of period after fertilization, or they should be cultured for a short period than 12 hours before returning back to the oviduct in order to develop to blastocysts. It was also found that though the embryos under the 2-cell block in culture showed normal feature up to 24 hours under the microscopical observation, they had already lost their capacity for the normal development, and if the culture of the 2-cell embryos was extended to 48 hours, they showed nuclei with heteropyknosis, and the vacuoles were were detected in the cytoplasm of embryonic cell if they were cultured for 72 hours.

• Proceedings of the Korea Water Resources Association Conference
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• 2023.05a
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• pp.497-497
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• 2023

정수장에서 소독 및 여과 처리가 완료된 깨끗한 물은 배급수시설로 전달되나, 실제로 관의 노후화, 갑작스러운 유향 변동, 특정 구역의 관 내 정체 시간에 따른 Water Age 상승 등 여러 요인으로 인해 실제 수용가에는 안전하지 않은 용수가 공급될 가능성이 있으며, 이에 따라 적절한 위치에서 지속적인 감시를 통한 조기 발견 및 조치가 필요하다. 상수도 시설기준(2010)에 배수시설의 주요 지점 혹은 관 말단 등 필요에 따라 적절한 위치에 수질 계측기를 설치할 수 있도록 제시되어 있으나, 계측기 설치 위치나 개수에 대한 기준이 모호한 실정이다. 모든 구역에 수질계측기를 설치하여 감시하는 것이 이상적이지만, 현실적으로는 지자체 환경 및 경제적인 한계가 있어 주요 위치에 설치하는 것이 바람직하다. 본 연구에서는 대표적인 수리해석 모형인 EPANET을 사용하여 대상 관망의 노후도, 유속, 유향변동 등의 영향인자를 바탕으로 수질사고가 발생할 확률이 높은 관을 위험관으로 선정하고, 선정된 위험관을 대상으로 최단 경로와 Cost를 산출할 수 있는 Floyd Warshall Algorithm을 이용하여 각 Node(수용가)간 물이 이동할 때의 최소 도달시간과 경로를 파악하였다. 또한, 시간 서비스 수준(Level of T hour Serivice)의 개념을 도입하여 위험관으로부터 특정시간 이내에 흐름이 도달하는 Node를 파악한 뒤, 그 중 가장 많은 피해를 발생시킬 수 있는 위험관을 수질계측위치 지점으로 선정하였다. 제시된 수질사고 발생위험이 높은 위험관을 대상으로 수질계측 위치를 선정하는 방법이 전체 관망 네트워크를 대상으로 수질계측 위치를 판단하는 방법보다 결과 신뢰도 측면에서 더욱 효과적이고 효율적인 방법으로 사료된다.

• Journal of The Korean Association of Information Education
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• v.15 no.3
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• pp.399-411
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• 2011

In the existing researches about the Internet and mobile phone addition for primary and secondary school students, the major addiction testing measurements are personal parameters such as obsession, self-efficacy, and self-control and environmental parameters such as parents, friends, schools, community factors, and mass media. Those researches have focused on the interaction objects between a student and him/herself, parents, friends, schools, or society. While the importance of time perspective has increased recently, there have rarely been the research that had focused on it in education arena. In this paper, we analyze how time perspective influences the Internet and mobile phone addiction levels of primary and middle school students. In order to do that, we surveyed 619 primary and middle school students and analyzed the results in this paper. And then, we renew the relative importance among existing factors for the two addictions and propose the way to prevent the two addictions.

• The Journal of the Korea Contents Association
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• v.13 no.6
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• pp.412-424
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• 2013

Due to the rapid increase in mobile-phone use, various kinds of malfunctions have occurred recently. Among them, the mobile-phone addiction causes serious social problems. In particular, since teenagers are immature, they are easily addicted to new technology. In order to prevent from the mobile-phone addiction, a lot of research has been performed in various ways. This paper focuses on the differences in gender and time perspectives of adolescent and analyze the relationships between time perspectives and self-efficacy for preventing mobile-phone addiction. In order to achieve our research goals, we firstly survey on 1,224 secondary school students to analyze the gender differences about time perspectives. And then, we secondly survey on 269 high school students to examine the mediation role of self-efficacy between time perspectives and mobile-phone addiction by a structural equation model. Based on the results of our analyses, we provide an educational guide that can prevent mobile-phone addiction from secondary school students.

• The Korean Journal of Rheology
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• v.3 no.2
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• pp.166-174
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• 1991

동일화학종이면서 \ulcorner량이 다른 두 단분산 고분자를 혼합한 2성분 다분산 농축계에 equivalent primitive chain model을 적용하여 사슬주위의 제약완화에 따른 관의 재형성 효 과를 각 사슬의 특성완화시간으로 산정하여 나타내었다. Polystyrene 시료에 대하여 동력하 적 실험을 실시한 결과를 이용하여 사동모델에 따른 각 사슬의 최장완화시간은 복소수 점도 의 허수분분(η＂)대 주파수($\omega$)의 관계, 관의 재형성 시간은 $\omega$ 변화에 따른 storage modulus(G＇) 로부터 각각 도출하였다. 이러한 작업을 통하여 특성완화 시간들이 분자량 및 각 성분 농도에의 의존성을 더욱 상세히 파악할 수 있었다.

• The Journal of Korean Association of Computer Education
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• v.16 no.6
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• pp.21-32
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• 2013

Since creativity has been emphasized and creative problem solving has also been a big topic recently, various kinds of research works have proceeded. Among them, this paper focuses on abstract thinking and growth mindset, which affect on problem solving. Also, this paper analyzes what kinds of relationships time perspectives and smart-phone addiction have with the two factors and how they influence on them. In order to do so, we survey on 441 primary, middle, high school, and college students. Our analysis results cover the relationships among the two factors, smart-phone addiction level, present-hedonic perspective, and future time perspective. In addition, we analyze the relationship among the factors with a structural equation model. By doing these, we propose educational alternatives in terms of time and plan to improve our adolescent's abstract thinking level, which helps their problem solving skills and their academic achievement.

• Korean Journal of Culture and Social Issue
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• v.24 no.4
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• pp.615-636
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• 2018

The purpose of this study was to investigate mediating the effect of Happiness Enhancing Activities(HEA) on the relationship between Balanced Time Perspective(BTP) and Subjective Well-Being(SWB). For this study, total subjects were 372 which is composed of the early-aged adults 192 and late middle aged adults 180 from Busan and Gyeongsangnam-do in South Korea. They completed the survey which is included Zimbardo Time Perspective Inventory(ZTPI), Korean Version of the Happiness-Enhancing Activities Questionnaire(K-HAQ) and Satisfaction with Life Scale(SWLS), Positive and Negative Affect Scale(PANAS). As a result of bootstrapping, BTP has a positive effect on SWB with the mediating effect of HEA and it comes out in the both subjects, early-aged adults and late middle-aged adults. To be specific, mediating effect of goal-focused activities and activities with family and friends in the relationship on BTP and SWB was significant for the early-aged. However only mediating effect of activities with friends in the relationship on BTP and SWB was significant for the middle-aged. This study is meaningful, it has turned up the effect of BTP on HEA in both subjects, early-aged adults and late middle-aged adults as well as found out the differences between generations of HEA.

• Journal of Bio-Environment Control
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• v.18 no.4
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• pp.408-412
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• 2009

Daily last time of irrigation in perlite bag culture was investigated to get high water use efficiency (WUE) and fertilizer use efficiency (FUE) and also sustain high productivity for tomato. The water content in the substrate was higher as the last time of irrigation was later from 4 to 1hour before sunset. The growth were not significantly different in all treatments. The marketable yield was the highest in treatments of 1 or 2hours before sunset and the lowest in treatment of 4hours. In the result to investigate for 128days WUE and FUE were the lowest in treatment of 1hour before sunset but the highest in treatment of 3hours before sunset. In the conclusion, it looks best to end irrigation 2~3hours before sunset in the aspects of plant growth, yield, WUE, and FUE.