• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2021년도 가을 학술논문 발표대회
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• pp.92-93
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• 2021

In the case of medical facilities, the evacuation time is delayed due to the decrease in the number of people in the hallway and exits due to the increase in the width of evacuation by using mobile beds, wheelchairs, crutches, etc. Accordingly, it is considered to secure evacuation capacity to reduce evacuation time according to corridor width and exit width. Accordingly, we would like to compare the standards related to the evacuation capacity of medical facilities in Korea and NFPA, derive differences, and use evacuation simulations to compare evacuation times according to changes in corridor width and exit width. In Korea, it is calculated based on the floor area by use, but in the case of NFPA 101, the number of evacuation routes, stair width, corridor exit width, and two-way door width was stipulated depending on the number of people. Using evacuation simulation, efficient evacuation capacity is calculated according to the reduction of evacuation time by changing the width of the hallway, changing the width of the exit, the width of the corridor, and the width of the exit. The evacuation simulation is intended to be used to secure evacuation safety of domestic medical facilities by calculating the effective evacuation time reduction by changing the width of the hallway and exit.

• 한국산업융합학회 논문집
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• 제21권3호
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• pp.141-147
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• 2018

In a time when product development cycles are getting shorter and shorter, many companies are making efforts to develop products with high reliability in a short period of time, accelerated life test is widely used as a method to quickly evaluate reliability. Accelerated life test reduces the test life or the life of the product from the observed data by shortening the lifetime of the product or abruptly lowering the performance under the worse condition than the actual condition in order to shorten the test cost or the test time. In this paper, BL3640A-06P+RB35, DC12V model, which is used in the support device of an automatic rotation type digital signage, which display various information such as textures and images on a display screen in a public place or a commercial space, BLDC motors were subjected to a constant stress test and at the rotational speed of 1rpm, $180^{\circ}$ rotation and reverse rotation under actual use conditions, the stress was imposed on the rotating speed of 2rpm and the weight of the actual installed product from 22.2kgf to 10kgf were installed. The lifetime of the actual use environment condition is 23,545 hours and the rotation speed is accelerated. The life time of the acceleration condition with the additional weight is 1,380 hours. The acceleration factor is calculated as 17.06, the one year guarantee test day is 235 days to 14 days, of the period from 470 days to 28 days, and the third year from 704 days to 42 days. The test date of the BLDC motor was tested on the shortened test date, and the rotational speed and the current value were measured. It is found that there is no defect even if it operates as the test date corresponding to the specified one year warranty period and the 3 year accelerated life test which is experimented. Using the statistical technique of the regression analysis the expected time for the motor to defect to #4 samples was 20 years.

• Industrial Engineering and Management Systems
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• 제11권4호
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• pp.390-396
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• 2012

The present paper extends the idea of tightened-normal-tightened sampling scheme to group acceptance sampling plans under the time truncated life tests. We consider three famous distributions that are widely used in the area of reliability such as the generalized exponential distribution, the Weibull distribution, and the Birnbaum-Saunders distribution in the proposed sampling plan. The plan parameters are determined such that the producer's risk and the consumer's risk are satisfied at the specified median life. Extensive tables showing plan parameters are provided at various values of the experiment time and the consumer's risk for each of three distributions for the practical use. Some examples are given to illustrate the procedure of the proposed plan.

• 대한가정학회지
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• 제42권10호
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• pp.63-77
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• 2004

The overuse of Internet has caused the problem of 'Internet addiction' in the life of college students. The purpose of this study was to develop a program of time management education for preventing Internet addiction among college students. The program consists of sessions. The first session is an introduction to the program which includes a pre-test about Internet addiction. The second session is designed to allow them to check their pattern of Internet use and time use by themselves. The third session is designed to set their tie goals and make long-range plans. The fourth session is designed to make short-range plans and look for alternative activities. The final session is the completion of the program. This study has some significance in developing a time management program for Internet addiction. and will be utilized in practical education.

• 대한산업공학회지
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• 제37권2호
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• pp.105-117
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• 2011

This study describes behavioral characteristics of Korean population over twenty years old in a variety of activities of daily living by analyzing the raw data of the time use survey provided by Statistics Korea (KOSTAT). Seven activities and forty four sub-activities of daily living were selected for analysis : personal care, employment, household care, family care, voluntary work and community participation, social life, recreation and leisure, and travel. In order to quantitatively understand how Korean adults spend their time for a day and how their lifestyle changes over time, we collected the time recorded by 3,673 respondents in three surveys over the past ten years (in 1999, 2004, and 2009). Then, we performed analysis of variance to compare the behavioral characteristics by user age and gender based on the mean time of each activity. The differences in behavior among user groups and over time could be used to design ergonomic products and services based on user experience, especially for universal design of housing and transportation facilities.

• 한국실내디자인학회논문집
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• 제6호
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• pp.63-66
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• 1995

Our natural desire to exuviate old theory and search for new ideas means conversion and reformation. Howev-er, the new idea of the present moment will soon become an ancient history when the next generation emerges with more advanced ideas. Naturally, we have learned to accept the past history and utilized it as a the foundation for the future. Through the repeated process of the learning method, the popula-tion cultivate themselves with proper understanding and appropriate attitude toward design. By analyzing social behaviors of the past and living conditions, we can ex-pand our imaginations beyond limits. Each society and its local condition have tremendous effects on the develop-ment and progress of artistic theories, techniques and craftsmanship, and potential design of every day use products. Today, interior design can not afford to ignore the or-ganic relationship of life style and space. Thus, the plan-ning of space means the planning of life style. Life style, as it is, has a vast definition and changes with time. That is why spaces, which consider the life style and its environment when designed, show different aspects ac-cording to its corresponding time. Interior design, in particular, differs by time and re-gion to create its unique style. The change in space is the natural result of the change in life style which again is sensitive to the change in cultural and environmental elements. Design is no longer designing of mere physical elements and environment. Design should be taken as the equivalent of creating spiritual culture.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2006년도 추계학술대회 논문집 전력기술부문
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• pp.9-11
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• 2006

This paper suggests a revision method for historical fault data using Proportional Aging Reduction(PAR) to consider maintenance effect in time-varying failure rate. In order to product time-varying failure rate, the historical fault data are necessary. However, the maintenance record could be left out in historical data by spot operator's mistake. In this case, the failure rate is produced less than the average failure rate for increasing equipments' life-time by maintenance effect. Hence, it is necessary for new time-varying failure rate to extract maintenance effect from the existing fault data. In this paper, the revision method to reduce equipments' life-time, adversely using PAR among three techniques to consider maintenance effect.

• 한국노년학
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• 제32권3호
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• pp.675-687
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• 2012

본 연구는 노년층의 인구통계학적 특성을 바탕으로 형성된 군집별 여가 시간량의 차이를 조사함으로써 세대 내 존재하는 다양한 속성에 따른 여가프로파일을 작성하는 것을 목적으로 한다. 이를 위해 2009생활시간조사자료 중 만 65세 이상 응답자가 이틀 동안 작성한 시간일지 5392부를 최종분석에 사용하였다. 자료 분석을 위해 기술분석, 상관분석, K-평균 군집분석, 분산분석, 사후분석(Scheffe)을 실시하였다. 연령, 성별, 교육수준, 월소득, 배우자유무, 경제활동여부, 거주지역에 따라 7개의 군집(군집명: 아직은 일을, 벗들과 취미생활을, 도시에서 다양한 여가를, 신앙 속에 우정과 취미생활을, 일하며 짬짬이 여가를, 변두리에서 여가를)이 형성되었으며, 군집별 여가 시간량의 차이를 살펴본 결과, 관람문화활동이나 물품구입활동을 제외하고는 대부분의 여가행동별 시간량은 군집 간에 유의한 차이를 보였다. 특히 노년층에게 일이나 배우자의 유무와 같은 사회적 역할의 상실이나 관계의 상실은 여가 시간량의 증감이나 행동유형에 차이를 만들어 내었다. 이러한 결과는 추후 노년층을 위한 여가서비스 및 정책을 기획하고 준비하는데 참고할만하다.

• 한국학교보건학회지
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• 제29권3호
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• pp.180-188
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• 2016

Purpose: The purpose of this study was to identify the correlation between the motivations to use social media and self-control among female middle school students. Methods: This study is a cross-sectional descriptive study. To collect the data, 300 female students of S and E middle school in S city responded to a self-administered questionnaire asking about their motivation for social media use and self-control. The data were analyzed through descriptive statistics, independent t-test, one way ANOVA, Scheffétest, Pearson's correlation, and stepwise multiple regression, using the SPSS/WIN 21.0 program. Results: The average time spent on social media was 3.70 hours. The mean scores of social media usage motivation and self-control were 48.15 and 58.47, respectively. The more average time spent on social media, the higher was the motivation to use social media. The scores of motivation to use social media were higher in students with low satisfaction of their school and family life. Students with low satisfaction of their school life had higher scores in some subcategories of self-control; preference to simple task, egocentrism, and stroppiness. Motivations to use social media showed a significant positive correlation with self-control. Self-control was affected by motivations to use social media and this variable explained 11.6% of self-control among female middle school students. Conclusion: The results of this study suggest that we should develop programs which help improve students' self-control and prevent the side effects of social media use among female middle school students.

• 한국콘텐츠학회논문지
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• 제16권9호
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• pp.590-599
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• 2016

본 연구는 청소년의 일상 스트레스와 스마트폰 이용 및 중독이 학업에 어떤 영향을 미치는지 파악하고, 스마트폰 이용에 대한 부모의 중재 효과를 분석하는 데 그 목적이 있다. 이를 위해 청소년(13~18세)을 대상으로 스마트폰 이용 전반에 관한 온라인 설문조사를 실시하였다. 분석 결과, 오락적 목적의 스마트폰 이용 및 스마트폰 중독 경향성이 청소년의 학업 장애 요인으로 나타났다. 또한 가족 간 갈등, 학업, 미래에 대한 압박감 차원의 스트레스가 스마트폰 이용에 따른 학업장애를 이끈다는 것 역시 확인할 수 있었다. 부모의 중재는 그 유형에 따라 스마트폰 이용 및 중독, 학업장애 요인에 대해 서로 다른 효과를 갖는 것으로 나타난다. 이용시간을 제한할수록 오락적 이용이 증가하고, 이용하는 앱을 제한할수록 정보적 이용이 감소하는 것으로 나타났다. 참여적 형태의 부모 중재는 커뮤니케이션을 위한 스마트폰 이용이 증가하며, 앱을 추천하는 방식의 부모 중재는 스마트폰 중독지수를 감소시키는 것을 알 수 있었다.