• Korean Chemical Engineering Research
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• v.57 no.1
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• pp.51-57
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• 2019

A plant layout problem has a large impact on the overall construction cost of a plant. When determining a plant layout, various constraints associating with safety, environment, sufficient maintenance area, passages for workers, etc have to be considered together. In general plant layout problems, the main goal is to minimize the length of piping connecting equipments as satisfying various constraints. Since the process may suffer from the heat and friction loss, the piping length between equipments should be shorter. This problem can be represented by the mathematical formulation and the optimal solutions can be investigated by an optimization solver. General researches have overlooked many constraints such as maintenance spaces and safety distances between equipments. And, previous researches have tested benchmark processes. What the lack of general researches is that there is no realistic comparison. In this study, the plant layout of a real industrial C3MR (Propane precooling Mixed Refrigerant) process is studied. A MILP (Mixed Integer Linear Programming) including various constraints is developed. To avoid the violation of constraints, penalty functions are introduced. However, conventional optimization solvers handling the derivatives of an objective functions can not solve this problem due to the complexities of equations. Therefore, the PSO (Particle Swarm Optimization), which investigate an optimal solutions without differential equations, is selected to solve this problem. The results show that a proposed method contributes to saving the capital expenditures.

• Journal of the Korean Society of Marine Environment & Safety
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• v.26 no.7
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• pp.787-797
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• 2020

The marine officer plays a pivotal role in the shipping organization as a professional who performs a complex and diverse function. On the sea, unlike land duty, the possibility of turnover increases due to characteristics such as living in isolated spaces, continuous shift work during a set sailing period, high intensity work tension, stress, and social isolation. In this study, the impact of the organization's civic actions on the intention of turnover as a mediator of organizational immersion was divided into three groups of large companies, small and medium-sized enterprises, and public enterprises to check the differences between each category in a structural manner. Analysis showed that there were statistically significant differences between the groups in loyalty and turnover intention when the sub-factors of organizational commitment and organizational citizen behavior of the marine officer, and the size of turnover intention were included. Organization citizen behavior did not directly affect turnover intention, but when indirect effects were included, there was an effect through loyalty, and relationship-oriented organizational citizen behavior negatively affected turnover intention through loyalty. Excluding public enterprises, the non-standardization path coefficients were -0.229±0.117 and -0.319±0.068, respectively, showing a statistically significant effect in large companies and SMEs. These results indicate that in order to lower the employee turnover intention in large corporations and small and medium-sized shipping companies, it is necessary to consider not only organizational citizen behavior but also measures to increase organizational commitment.

• Korean Journal of Clinical Laboratory Science
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• v.55 no.1
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• pp.52-64
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• 2023

This study aimed to examine the types and characteristics of otorhinolaryngology examinations performed by clinical laboratory technologists and to investigate the working environment and scope of work of otorhinolaryngology laboratory personnel using online questionnaires. Based on the research results, constructive policy measures for the University-Association-Society were also presented. Most of the survey respondents were in their 40s (34.1%). Females accounted for 80.2% of respondents and 30.8% of them had a career spanning 15 years or more. We found that laboratory personnel had a wide scope of work, high work stress and frequently suffered occupational diseases. We observed that, to reduce stress and increase satisfaction, an expansion of the workforce was necessary. Compared to other occupations, 72% of clinical laboratory technologists occupied more senior positions, occupational distribution depended on senior positions (P<0.001). Clinical laboratory technologists performed about 26 types of otorhinolaryngology examinations. The most frequent test performed daily was pure tone audiometry, and polysomnography took the longest test time, with an average of 8 hours. In conclusion, clinical laboratory technologists were in charge of various specialized otorhinolaryngology examinations. Considering the importance of clinical laboratory technologists in otorhinolaryngology, the University-Association-Society should put in additional effort into nurturing otorhinolaryngology examination experts.

• Proceedings of the Korean Society of Computer Information Conference
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• 2016.07a
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• pp.151-153
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• 2016

본 논문에서는 병원조직에서 종사하는 진료행정직종과 간호직종을 대상으로 그들의 이직의도와 직무요인 사이의 인과관계를 통해 이직 또는 잔류의도에 영향을 미치는 동기요인과 위생요인을 분석하고, 그 결과를 근거로 이직감소 방안을 제시하고자 한다. 연구의 표본은 광주광역시 소재의 중소병의원에서 근무하고 있는 진료행정직종과 간호직종만을 대상으로 실시하고자 한다. 연구결과를 예측을 하면, 진료행정직종과 간호직종 사이에는 직무특성의 차이에 따른 이직의도 수준은 유의한 차이가 있을 것으로 보이며, 직무환경과 이직의도 간에 유의한 차이가 있을 것으로 예측해 볼 수 있다. 또한 두 직종의 감정노동 강도와 이직의도 사이에 통계적으로 인관관계가 존재할 것으로 예측할 수 있다. 따라서 본 연구에서는 가설에 대한 실증검증을 통해 진료행정직종과 간호직종에서 인지하는 직무요건 중 동기요인과 위생요인을 파악하고, 두 요인이 이직의도와 어떤 인과관계가 있는지를 분석하여 두 직종의 이직률을 낮출 수 있는 방안을 제시하고자 한다.

• Journal of the Korea Society of Computer and Information
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• v.3 no.1
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• pp.161-180
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• 1998

The concept of office will change from the physical workplace with paperwork to unphysical workplace with paperless-work in the information-oriented society of the 21th century. We can find such change from increasing of alternative office, e.g. SOHO(Small office home office), Virtual office, Electronic office, Digital workplace, Satellite office, Hotelling, Telecommuting, etc. In this paper, through a few cases in the advanced nations you shall probably get answers to following questions: How do they make use of alternative office, what is strategic values of that, and how shall we design and build it to increased business performances in the business world?

• Journal of Korean Library and Information Science Society
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• v.38 no.2
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• pp.399-430
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• 2007

According to the changing of user and service environment, one of countermeasures that introduction of team-based organization is increasing gradually in the university library. This study was conducted to suggest the efficient ways of assessing team effectiveness which is increasing gradually in the university library. The finding indicated that assessment of team effectiveness was shown large differences according to the working level and individual's working duration. In addition, activated communication and capacity of team-based organization were the most effectible factors on the team effectiveness. So that, for maximizing the team effectiveness, this study might be applicable to any strategy which seek to activate communication methods(within - and between team) those are directly effecting on purpose setting, conflict resolution and suggest suitable team-based organization model for University library's characteristic and purpose through improving on the capacity of team system.

• Korean Journal of Cognitive Science
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• v.16 no.3
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• pp.199-211
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• 2005

Using a psychometric paradigm, risk perception of 30 hazards was investigated for three social groups-college students, experts of technologies, and employees of environmental organizations. The aim of this study was to examine psychological dimensions of risk perception, namely, to replicate the psychological dimensions - dread and knowledge -, which Slovic et al(1978; 1984; 1987) found and to forker explore discrepancies between societal groups. The results confirmed the same psychological dimensions Slovic et al have found. However, there are a number of significant differences in perceived risk such as perceived social benefits and other risk characteristics between three groups that suggest differences in ecological attitudes. The results were compared with those of Slovic et af and the nature of differences in risk perception among three groups were discussed.

• Korean Journal of Health Education and Promotion
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• v.30 no.5
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• pp.125-138
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• 2013

Objectives: The purpose of this study is to analyze factors associated with depression among workers in South Korea by socio-economic factors, health behaviors, and working conditions. Methods: Study subjects include 4,251 adults (19 and older) who are currently working using the data from 2009 National Health and Nutrition Survey. Data were analyzed using frequency test, $X^2$ test, and multiple logistic regression. Results: Multiple logistic regression analysis showed that gender (OR=1.91, p<.001), age (OR=1.53, p=.030), marital status (31-39: OR=1.88, p=.029) were significantly related to depressing among socio-economic factors. Next, among health behaviors factors, perceived health status (Poor: OR=1.76, p=.049; Very poor: OR=3.46, p=.002) was statistically significant. Among characteristics of work environment, trust and respect (OR=1.34, p=.049) and working with hidden emotion (OR=1.88, p<.001) were significantly related to depression. Conclusions: In order to manage and reduce depression among workers, it is important to develop appropriate mental health promotion programs both in work places and in regulations.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.17 no.11
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• pp.332-339
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• 2016

This study aimed to investigate the awareness and performance of safety in operating room nurses. There were 161 operating room nurses from eight general hospitals included for analysis in this study. The data were analyzed with t-test, one-way ANOVA, correlation analysis, and Scheffe's test. The results show that their perception of patient safety was 3.33 out of a total of 5 points. Moreover, the score of safety management activity for patients in the operating room was 4.28 out of 5 points. As the perception of patient safety in operating room nurses was significantly correlated with their safety management activities, nurses with higher awareness of patient safety were found to have higher degree of performance of safety management activities. In conclusion, to improve safety management activities, open discussion about patient safety should be encouraged and periodic education regarding patient safety should be implemented for operating room nurses to increase the perception of patient safety.

• Korean Journal of Social Welfare
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• v.59 no.3
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• pp.175-199
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• 2007

The study analyzes the characteristics, work stress, satisfaction and attitudes toward dementia of social care work force for dependent elders in Korea. Data were from 502 staffs including social workers, nurses, and direct care workers from 45 diverse type of nursing facilities in Busan and Daegu area. The results of the analysis indicate that they are low paid and overloaded in general. The respondents espoused highly hopeful and person-centered attitudes toward dementia and the elderly, while they showed low level of satisfaction related to work. The stress levels were higher in sub scales concerning care tasks and physical environments in work places. In addition, the results of multiple regression denote that those have higher level of satisfaction who are nurses, have no intension to quit, have more experiences of work education, and working in facilities with more frail elders. Stresses were closely related to higher level of education and the intension to quit. Person centered attitude was more often reported by those who have more elderly clients to take care of and are working in facilities with more elders who are demented and over 80. In particular, the association was consistent between higher level of job satisfaction and the person centered attitude. Several practical suggestions linked to the analysis were made including improving the welfare for staffs working in nursing facilities and providing continuous professional training and education for them particularly on person-centered care. In addition, it was emphasized to raise the morale of social care work force considering the rapidly increasing need of long term care and the important influence that care work force has on older persons' quality of life from now on.