• Journal of Information Technology Applications and Management
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• 제20권4호
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• pp.33-45
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• 2013

The trend toward ubiquitous computing does not represent simply a change in the way people access and use information. In the end it will have a profound effect on the way people work with each other. In this paper, we have defined functionalities of an information system that helps operate a kind of smart office environment, and implemented the system using RFID technology. The system provides three major functions-time and attendance management, personalized message notification, and flexible seat allocation for a smart working center. We have also suggested the key performance indicators and performed a KPI analysis to measure an efficiency of implemented system.

• 경영과학
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• 제11권1호
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• pp.23-37
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• 1994

This paper discusses the methodology for the operational performance of unit-load automated guided vehicles(AGVs) in a flow-shop-type flexible machining and assembly systems (FM/AS). Throughout the paper, AGVs are working as a carrier and mobile workstation. For a double-loop FM/AS, in which one loop is dedicated to machining and the other to assembly, three AGV operating strategies are proposed. Considering the entering interval and travel time of AGVs between workcenters, the strategies are developed to determine the best job sequence which minimizes the makespan and vehicle idle time. Entering times of AGVs and the required minimum number of AGVs are obtained on the basis of the best job sequence. When the number of AGVs are limited, entering times of AGVs are adjusted to maximize the utilization of AGVs.

• 산업경영시스템학회지
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• 제22권50호
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• pp.127-137
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• 1999

This study is concerned with the loading problems in flexible manufacturing system(FMS). The loading problem in FMS is a complex one, when the number of machine and job is increased. It may be time-consuming and even impossible to achieve an optimal solution about this problem mathematically. Thus, a heuristic method is recommended in order to gain near-optimal solutions in a practically acceptable time. A new loading algorithm is developed with a multi-criterion objective of considering the workload unbalance, and maximizing the machine utilization, throughput for critical resources such as the number of tool slots and the number of working hours in a scheduling period and so on. The results of SAS analysis indicated that true average throughput of proposed heuristic loading statistically exceeds that of Shanker and Srinivasulus loading algorithm at the significance level of 0.1.

• Annals of Occupational and Environmental Medicine
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• 제35권
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• pp.28.1-28.12
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• 2023

Background: Owing to the coronavirus disease 2019 pandemic, being exposed to work from home and work during nonwork time simultaneously can lead to sleep disturbance; however, their combined effect is unclear. We aimed to investigate the combined effect of work from home and work during nonwork time on sleep disturbance. Methods: This study used data from the Sixth Korean Working Condition Survey and included 27,473 paid workers. Logistic regression analysis was conducted to investigate the relationship between work from home, work during nonwork time, and sleep disturbance according to sex. We re-classified participants into 4 groups based on their working from home (No/Yes) and working during nonwork time (No/Yes). The relative excess risk due to interaction was calculated to examine the effect of exposure to both telecommuting and non-regular work hours on sleep disturbance. Results: Workers exposed to work from home and work during nonwork time had significantly higher risks of sleep disturbance for all, men, and women workers (OR [95% CI]: 1.71 [1.46-2.02], 1.79 [1.43-2.23], and 1.64 [1.29-2.08] for work from home and 3.04 [2.70-3.42], 3.61 [3.09-4.22], and 2.41 [2.01-2.90] for work during nonwork time, respectively). Compared to those who were not exposed to both factors, when workers had both job factors, the ORs (95% CI) of sleep disturbance for all, men, and women were 3.93 (2.80-5.53), 5.08 (3.21-8.03), and 2.91 (1.74-4.87), respectively. The relative excess risk due to interaction of work from home and work during nonwork time was not significant for sleep disturbance. Conclusions: Work from home and work during nonwork time were each associated with sleep disturbance, but the interaction between the two factors on sleep disturbance was not observed in both men and women.

• 산업공학
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• 제17권2호
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• pp.208-217
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• 2004

This paper deals with a process planning problem in the flexible assembly system (FAS). The problem is to assign assembly tasks to stations with limited working space and to determine assembly routing with the objective of minimizing transfer time of the products among stations, while satisfying precedence relations among the tasks and upper-bound workload constraints for each station. In the process planning of FAS, the optimality of assembly routing depends on tasks loading. The integration of tasks loading and assembly routing is therefore important for an efficient utilization of FAS. To solve the integrated problem at the same time, in this paper we propose a new method using an artificial intelligent search technique, named 2-leveled symbiotic evolutionary algorithm. Through computational experiments, the performance of the proposed algorithm is compared with those of a traditional evolutionary algorithm and a symbiotic evolutionary algorithm. The experimental results show that the proposed algorithm outperforms the algorithms compared.

• 한국지역사회생활과학회지
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• 제21권3호
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• pp.285-298
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• 2010

This study aims to analyze teachers job satisfaction according to the working environment of teachers working in child-care centers and to investigate which variables of the working environment relate to job satisfaction of child-care teachers. The main results of this study were as follows. First, married teachers are more satisfied with the job itself, supervision, and colleague relations compared to teachers who are not married. Teachers with certificates are more satisfied with the job itself compared to teachers without certificates. Second, teachers's job satisfaction is significantly correlated with their salary, welfare, and colleague relations. Also teachers' job satisfaction is correlated with responsibility in the case that teachers have a good relation with their principal and child-care parents. Third, the results of this study show that teachers consider substitute teachers, vacation systems, day care systems, compliant with the ratio of teacher and children, job security, order of legal status as important. With regard to external compensation, teachers want salary increase, payment on overtime labor, flexible work-time, use of both full-time and part-time teachers, expansion of educational materials, increase on purchasing cost for textbooks and materials. To improve the quality of child-care teachers' working environment as well as their satisfaction, practical policies need to be implemented.

• Journal of Welding and Joining
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• 제32권5호
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• pp.58-64
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• 2014

The shipbuilding industry is facing the various problems of less demand and oversupply owing to the global economic crisis and the increase in shipbuilding countries. Shipyards of the industry are making effort to strengthen their ability to handle the crisis via a smartwork technology for flexible working environment. In this study, we developed a smartwork system that manages the information in shipbuilding process with mobile devices such as smart phones and tablet PCs. To successfully apply the developed smartwork system to shipyards, we analyzed several best practices and management tasks of the shipbuilding processes. The developed system was designed by CBD approach that is a branch of service-oriented software engineering for reusability and flexibility on the system. As it is designed considering the flexible working environment, it supports to increase their productivity by reducing the time required to carry out tasks and by increasing the mobility required to manage work performance in field of shipyards.

• 가족자원경영과 정책
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• 제26권2호
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• pp.37-51
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• 2022

본 연구에서는 한국노동패널 23차 부가조사 자료를 이용하여 유연근무제와 근로자의 일·생활균형의 관계에 대해 코로나 19 이후 재택근로 확산의 영향을 중심으로 분석하였다. 분석 결과, 재택근무제는 근로자의 행복도 및 가족관계 만족도에 긍정적인 영향을 미치는 것으로 나타났으며, 여성의 경우 직무만족도와 조직몰입도, 일자리 안정성과 관련한 직무 만족도에도 긍정적인 영향을 미치는 것으로 확인되었다. 또한, 재택근무자와 비재택근무자의 코로나19를 전후로 한 시간활용 변화를 수면시간, 자기계발시간, 자녀돌봄, 가사노동, 운동, 친교모임 등 다양한 측면에서 살펴보았는데, 가장 큰 특징은 재택근무자가 비재택근무자에 비해 코로나19 이후 가사노동 시간과 자녀돌봄 시간이 더욱 크게 증가하였다는 점이며 이러한 경향은 여성에게서 더욱 크게 나타났다. 본 연구의 분석 결과는 재택근무제의 효과가 자녀돌봄과 일을 병행해야 하는 근로자들에게는 그 효과가 반감될 수 있으며, 그 영향은 여성에게 더 클 수 있음을 시사한다. 따라서 자녀돌봄 등으로 인해 일·생활갈등 상황에 놓인 재택근로자들이 업무생산성을 유지하고 일·생활균형을 실현할 수 있도록 사회적 지원을 강화할 필요가 있으며, 유연근무제도가 전통적 성역할을 강화하는 매개체가 되지 않도록 적극적인 정책적 노력이 필요할 것이다.

• 임상간호연구
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• 제19권3호
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• pp.333-344
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• 2013

Purpose: This study was conducted to provide baseline data to develop work patterns for nurses that are suitable to Korean hospitals. Shift work patterns and nurses' preferences for working condition were examined. Methods: Questionnaires for nurse departments and nurses were mailed to 478 hospitals from June 1 to July 30, 2012. Nurse departments of 174 hospitals and 1,409 nurses responded to the questionnaire. Data were analyzed using SPSS statistical program. Results: Of the nurses, 89.4% were working three shifts. Of the hospitals, 17.3% had implemented fixed night work. Although 80% of nurses preferred fixed time work, only 24.9% of hospitals had fixed working hours. Of the nurses, 57% agreed with night work as fixed but potential night nurses accounted for only 17% of the respondents. Sixty-three percent of the nurses agreed on short time work during busy hours. There were preference differences according to age, marital status and clinical career. Conclusion: As many nurses reported a preference for various flexible working patterns rather than three shift work, there is a need for new decisions on hospital policy to ensure improved working conditions for nurses and enhanced job security. Legal requirements also need to be considered for various work patterns.

• 대한두경부종양학회지
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• 제28권2호
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• pp.114-117
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• 2012

Background and Objectives : To assure the surgical completeness of the gasless endoscopic thyroidectomy via single incision axillary approach using flexible videoscope which provide wide angle and working space, we compared single incision axillary approach and axillo-areolar approach by means of clinical, surgical outcomes. Materials and Methods : From March 2011 to July 2012, 24 patients who had underwent endoscopic thyroidectomy via transaxillary approach were enrolled. Of total, 17 patients underwent single incision axillary approach(group I) and the other 7 underwent axillo-areolar approach(group II). Results : Patient demographics, surgical indications were similar between the two groups. The operating time(group I 144.6min, group II 153.6 min ; p=.29), blood loss(group I : 55.4cc, group II : 35.7cc : p=.64), hospital stay(group I : 4.2days, group II : 4.4 days ; p=.65) were similar in the two groups. Overall, two patients in group I(2/17, 11.8%) experienced postoperative complications, including one hematoma and one seroma. Due to narrow working space, one patient was change to axillo-areolar approach during single incision axillary approach with $30^{\circ}$ rigid endoscope. Conclusion：Single incision axillary approach is safe and effective similar to other endoscopic thyroidectomy methods using flexible videoscope. Different with $30^{\circ}$ rigid endoscope, 10-mm flexible videoscope can put inside the axillary inicision site in different axis with endoscopic instruments. This difference in endoscopic axis help to prevent crash with endoscopic instrument.