• 한국건축시공학회:학술대회논문집
• /
• 한국건축시공학회 2018년도 춘계 학술논문 발표대회
• /
• pp.124-125
• /
• 2018

The objective of this study is analyzing of requirements for improvement of the work-life balance of construction managers working in Korean construction companies. A survey has been conducted to analyze the requirements for improvement of construction managers. The survey was conducted on construction managers working in the field of architectural construction. 59 field managers working in 18 Korean construction companies responded to the survey. Upon analysis of the survey, the working hours were excessive and recreational time was very poor for the construction managers. There were differences in the answers regarding the areas that require improvement in the working conditions based on the age groups of the construction managers. A majority of young technicians selected that the recreational time and content of work require improvement, and technicians with a lot of experience selected that the stability of occupation and wage require improvement.

• 품질경영학회지
• /
• 제22권2호
• /
• pp.127-142
• /
• 1994

In these days, the PCs are widely used in the mid-level factory. But they have low-effectiveness for using them. The main reason should be the lack of useful and practical software in the market. This Case study aimed at the support of the software using DB Language to get M/M chart for aquiring work study and standard time data in the mid-level factory having multi-item and multi-process type. CVA (Chronocycle Video Analysis) is applied to get basic standard time data and working list. Standard time, Sequence of working and allowance time or rate for man and machine will be readily obtained through the menu when the software executing. Detailed program list is systematically shown in Appendix.

• 국제학술발표논문집
• /
• The 6th International Conference on Construction Engineering and Project Management
• /
• pp.304-309
• /
• 2015

On construction sites, it is important to monitor the performance of construction equipment and workers to achieve successful construction project management; especially, vision-based detection methods have advantages for the real-time site data collection for safety and productivity analyses. Although many researchers developed vision-based detection methods with acceptable performance, there are still limitations to be addressed: 1) sensitiveness to the shape and appearance changes of moving objects in difference working postures, and 2) high computation time. To deal with the limitations, this paper proposes a detection algorithm of construction equipment based on Integral Channel Features. For validation, 16,850 frames of video streams were recorded and analyzed. The results showed that the proposed method worked in high performance in terms of accuracy and processing time. In conclusion, the developed method can help to understand useful site information including working pattern, working time and input manpower analyses.

• 설비공학논문집
• /
• 제21권9호
• /
• pp.505-512
• /
• 2009

A thermosiphon is utilized as a thermal shunt to reduce the cool-down time of a cryogenic system cooled by a two stage cryocooler. The cool-down time reduction by the thermosiphon is determined by the type of working fluid which is directly related to the operating temperature range of the thermosiphon. A mixed working fluid has a potential to widen the operation temperature range of the thermosipohon. In this study, the thermosiphon using N$_2$ and CF$_4$ mixture as the working fluid is fabricated and tested to verify its transient heat transfer performance. The thermosiphon with the mixed working fluid has no noticeable reduction of cool-down time compared with that of the thermosiphon with pure working fluid in this experiment. However, it seems that the thermosiphon with mixed working fluid may have an advantage according to the cooling capacity of a cryocooler, the cooling target temperature and the size of a cooling object.

• 전기학회논문지P
• /
• 제56권2호
• /
• pp.99-103
• /
• 2007

In this paper, one type of a security system for panel working is suggested. The industrial Ethernet is used for open-close door control of the working panel and for monitoring the working panel is correct or not. Especially to upgrade the security system, a remote approval function of panel working by using the given approval number, a remote monitoring function for checking the approved panel is currently working or not, and an alarming function for keying the unapproved number or opening the disapproved panel, are added for preventing and reducing the intentional working error. Also the worker and working time are stored in PC automatically in exel file for detecting the working error. To show the possibility of suggested security system. two-working panel system is prepared and studied.

• Journal of Nutrition and Health
• /
• 제47권3호
• /
• pp.206-213
• /
• 2014

본 연구에서는 패스트푸드점 아르바이트생 118명과 패스트푸드점 외의 음식 관련 서비스업에서 일하는 아르바이트생 115명을 대상으로 설문조사를 실시하여 식습관과 패스트푸드에 대한 인식 및 패스트푸드 섭취 빈도 등을 비교하여 두 집단 간에 차이가 있는지를 남녀별로 나누어 파악하고자 하였다. 남자의 경우 패스트푸드점 아르바이트생과 그 외 아르바이트생에 있어서 연령, 신분, 주거형태, 용돈, 음주, 흡연, 일하는 시간 및 시급에는 차이가 없었으며, 음주횟수에 차이가 있었다. 여자의 경우 패스트푸드점 아르바이트생은 그 외 아르바이트생에 비해 20세 이상의 대학생이 더 많았고, 6시간 이상으로 일하는 학생이 많았으며, 시간당 급여가 더 높았다. 여자의 경우 패스트푸드점 아르바이트생이 그 외 아르바이트생에 비해 식사 횟수는 적고, 간식으로는 패스트푸드를 먹는다고 한 사람이 더 많았으며, 남녀 모두 야식을 더 자주 먹는 것으로 나타나 식습관이 더 나쁜 경향이 있었다. 또한 패스트푸드점 아르바이트생은 그 외 아르바이트생에 비해 남자의 경우 과일류의 섭취빈도, 여자의 경우 콩 및 콩제품의 섭취빈도가 유의적으로 낮았다. 또한 패스트푸드점 남자 아르바이트생은 패스트푸드의 장점에 대한 인식 점수가 더 낮았다. 패스트푸드점 아르바이트생은 남자의 경우 햄버거류, 피자류, 탄산음료, 여자의 경우 햄버거류, 감자튀김, 도넛, 탄산음료에서 그 외 아르바이트생보다 유의적으로 섭취빈도가 높았으며, 연령, 신분, 주거형태, 용돈, 음주, 흡연, 일하는 시간, 시급 등으로 보정한 후에는 남녀 모두 햄버거류, 피자류의 섭취빈도가 유의적으로 높았다. 총 섭취빈도도 패스트푸드 아르바이트생의 섭취빈도가 더 높았으며, 연령, 신분 등으로 보정한 후에도 여전히 유의적인 차이를 나타냈다. 이와 같이 패스트푸드점에서 일하는 아르바이트생은 그 외아르바이트생보다 식습관이 더 나쁘고, 패스트푸드를 더 자주 섭취하고 있었다. 따라서 패스트푸드 아르바이트생은 결식하지 않고, 다양한 식품을 충분히 섭취하도록 노력하는 등의 좋은 식습관을 갖도록 더 노력해야 할 것이며 이를 도울 수 있는 영양교육이 요구된다.

• 농업과학연구
• /
• 제38권1호
• /
• pp.101-108
• /
• 2011

In forest work, working conditions are very hard to improve. The proper distribution of work time and good posture is believed to bring about direct improvements such as accident prevention. On this, this study has analyzed forest workers' posture and their working hours in order to improve their working conditions in stone channel work. Authors has chosen several core elements of stone channel work to focus on, which include stone masonry, excavation of bed, moving stone, directing work, choosing stone, and breaking stone. The ratio of real working time over total working time was shown as 84.6%. As for the time ratio of each elemental work over the real working time, the stone masonry was 60.4%, the directing work was 15.1%, moving stone was 12.1%, choosing stone was 7.1%, breaking stone was 3.3%, and excavation of bed was 2.0%. According to the analytical results provided by OWAS, the ratio of category III (Work posture has a distinctly harmful effect on the musculoskeletal system) has shown that moving stone turned out 65.2%, choosing stone was 61.5%, stone masonry was 46.1%, breaking stone was 14.3%, excavation of bed was 12.5% and directing work was 6.8%. Furthermore, the ratio of category IV (Work posture with an extremely harmful effect on the musculoskeletal system) has shown that excavation of bed turned out 37.5%, breaking stone was 28.6%, stone masonry was 27.3%, choosing stone was 7.7%, moving stone was 6.1% and directing working was 4.5%. These results are expected to be utilized for the improvement with respect to both working methods in the stone channel work and the workers' working posture.

• Safety and Health at Work
• /
• 제7권4호
• /
• pp.363-371
• /
• 2016

Background: Seafaring is an inherently stressful environment. Because working time and leisure time is spent in the same confined environment for a prolonged period of time, many stressors present in seafaring can also be conceived of as chronic. We explored the effects of duration at sea, seafaring experience, environmental stressors, and psychological capital (PsyCap) on the sleep quality and fatigue of seafarers. PsyCap is a construct that draws upon ideas from positive psychology and positive organizational behavior, and is intended to capture an individual's psychological capacities that can be developed and utilized for performance improvements. Methods: We collected survey data from a sample of seafarers working in the offshore re-supply industry (n = 402) and a sample of seafarers working on board combined passenger and cargo ships (n = 340). Results: PsyCap emerged as a robust predictor with statistically significant relations to fatigue and sleep quality in both samples. PsyCap also interacted with duration at sea in explaining fatigue in seafarers working on board the passenger and cargo ships. Seafarers on passenger and cargo ships also reported significantly higher levels of fatigue than those working in the offshore re-supply industry. Conclusion: Coupled with emerging research showing that PsyCap is trainable, our results suggest that maritime organizations could have much to gain by being cognizant of and developing routines for continually developing the PsyCap of their employees.

• Journal of the Korean Data and Information Science Society
• /
• 제24권3호
• /
• pp.651-658
• /
• 2013

For the marginal model and generalized estimating equations (GEE) method there is important full covariates conditional mean (FCCM) assumption which is pointed out by Pepe and Anderson (1994). With longitudinal data with time-varying stochastic covariates, this assumption may not necessarily hold. If this assumption is violated, the biased estimates of regression coefficients may result. But if a diagonal working correlation matrix is used, irrespective of whether the assumption is violated, the resulting estimates are (nearly) unbiased (Pan et al., 2000).The quadratic inference functions (QIF) method proposed by Qu et al. (2000) is the method based on generalized method of moment (GMM) using GEE. The QIF yields a substantial improvement in efficiency for the estimator of ${\beta}$ when the working correlation is misspecified, and equal efficiency to the GEE when the working correlation is correct (Qu et al., 2000).In this paper, we interest in whether the QIF can improve the results of the GEE method in the case of FCCM is violated. We show that the QIF with exchangeable and AR(1) working correlation matrix cannot be consistent and asymptotically normal in this case. Also it may not be efficient than GEE with independence working correlation. Our simulation studies verify the result.

• 산업경영시스템학회지
• /
• 제43권1호
• /
• pp.61-69
• /
• 2020

Systems such as database and socal network systems have been broadly used, and their unexpected failure, with great losses and sometimes a social confusion, has received attention in recent years. Therefore, it is an important issue to find optimal maintenance plans for such kind of systems from the points of system reliability and maintaining cost. However, it is difficult to maintain a system during its working cycle, since stopping works might incur users some troubles. From the above viewpoint, this paper discusses minimal repair maintenance policy with periodic replacement, while considering the random working cycles. The random working cycle and periodic replacement policies with minimal repair has been discussed in traditional literatures by usually analyzing cases for the nonstopping works. However, maintenance can be more conveniently done at discrete time and even during the working cycle in real applications. So, we propose that periodic replacement is planned at discrete times while considering the random working cycle, and moreover provide a model in which system, with a minimal repair at failures between replacements, is replaced at the minimum of discrete times KT and random cycles Y. The average cost rate model is used to determine the optimal number of periodic replacement.