• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 1992년도 춘계학술대회 논문집
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• pp.306-312
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• 1992

The prevention of roll breakage in hot rolling process is improtant to reduce maintenance cost and production loss. Rolling conditions such as the roll force and torque have been intensively studied to overcome the roll breakage. in the present work, a model for life prediction of work rolls under working condition was developed and discussed. The model consists of stress analysis, crack propagation, wear and fatigue calculation model. Roll life can be predicted by stress, crack depth and fatigue damage calculated from this model. The reliability of stress analysis is backed up by the FEM analysis. From the result of simulation using by pressent model, although the fatigue damage of back up roll reachs 80% of practical limit, that of workroll was less than 40%. In edge section of workroll stress amplification is found by wear and bender effect. We can judge that workroll failures are not due to fatigue damage, crack propagation by bending stress but stress amplification by wear and bender in present working condition.

• 한국직업건강간호학회지
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• 제8권1호
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• pp.68-83
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• 1999

Occupational health nursing (OH N) guide book has been perceived as necessary since group occupational health services started. This study aimed to develop the guidebook for occupational health nurses working in small-scale enterprises(SSE). The guide area of nursing services was selected in 10 categories. These areas were 4 Workplace attitude for occupational health nursing', 'Nursing process', 'Workplace environmental monitoring', 'Personal protective devices', 'Record', 'Health counselling', 'Communication', 'Health education', 'Health screening' and 'Health promotion'. The content was mainly constructed with literature review. The pretest was done to find out what OH nurses do feel about their OH nursing services. Figures were used to guide some occupational health nursing services (OHNS). The further research was expected to develop in more extensive depth and quality.

• 반도체디스플레이기술학회지
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• 제3권2호
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• pp.17-21
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• 2004

Aluminum nitride(AlN) thin films were deposited on silicon substrate by reactive RF magnetron sputtering without substrate heating. We investigated the dependence of some properties for AlN thin film on sputtering conditions such as working pressure, $N_2$ concentration and RF power. XRD, Ellipsometer and AES has been measured to find out structural properties and preferred orientation of AlN thin films. Deposition rate of AlN thin film was increased with an increase of RF power and decreased with an increase of $N_2$ concentration. AES in-depth measurements showed that stoichiometry of Aluminium and Nitrogen elements were not affected by $N_2$ concentration. It has shown that low working pressure, low $N_2$ concentration and high RF power should be maintained to deposit AlN thin film with a high degree of (0002) preferred orientation.

• 한국레이저가공학회지
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• 제11권2호
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• pp.20-25
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• 2008

Polyimide is one of the useful materials in industry. The surface treatment of polyimide by a femtosecond laser can help accurate and fine fabrication of microstructure. And it can change the transmittance and reflectance of polyimide, too. We put femtosecond laser pulses on polyimide for rectangular or square type surface treaments and observe the change of transmittance and reflectance. Pulsewidth is 172 fs, laser power changes for fabrication are from 5 mW to 20 mW, and transmittance and reflectance are measured under 20m W, 300m W, and 920 mW. Pulse patterning is stable and almost no unwanted surface damage is shown. As power increases, working depth increases but working line width does not increase significantly. As speed changes, they also have same results. It shows the efficiency of a femtosecond laser is good and thermal damage is small for polyimide.

• 한국정밀공학회지
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• 제10권3호
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• pp.69-80
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• 1993

It is important to prevent roll failure in hot rolling process for reducing maintenance coat and production loss. Roll material and rolling conditions such as the roll force and torque have been intensively investigated to overcome the roll failures. In this study, a computer roll life prediction system under working condition is developed and evaluated on IBM-PC level. The system is composed and fatigue estimation models which are stress analysis, crack propagation, wear and fatigue estimation. Roll damage can be predicted by calculating the stress anplification, crack depth propagation and fatigue level in the roll using this computer model. The developed system is applied to a work roll in actual hot rolling process for reliability evaluation. Roll failures can be diagnosed and the propriety of current working condition can be determined through roll life prediction simulation.

• 가족자원경영과 정책
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• 제9권3호
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• pp.17-29
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• 2005

The purpose of this study is to identify the characteristics of the household labors that are performed by dual income families. The methodology that has been applied in this study was a qualitative research based on in-depth interviews of a total of 10 people(8 housewives, 2 husbands) selected from the 8 different families. The 8 different families have been selected in order to identify the different family lives and the various household labor patterns that are conducted by both the working husband and the working wife. As a result, we have found out that working wives still had to manage their time in an extremely busy manner in order to balance their professional work with their household tasks. However, the household work that was being shared by the husbands also seemed to vary dynamically according to the different family situations. Although, it has shown that household tasks are divided by the person's sex, the amount of household tasks that are shared tended to increase according to the life cycle of each family.

• Architectural research
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• 제19권2호
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• pp.27-33
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• 2017

Advances in information and mobile technologies have changed the traditional firm ways of working very flexible, collaborative and innovative, resulting in the changes in work place structures and layouts. Despite the growing body of literature examining the novel ways of working, which is called smart work, there is little academic attentions paid to the spatial aspects of new work places, namely smart offices and smart work centers. This research explores the spatial changes of work places that improve business efficiency and collaboration among workers suitable for the novel ways of working. Conducting in-depth field surveys on selected cases, we analyzed the changes in spatial structure and operation policies of smart offices and smart work centers. From this survey, we observed that the new work places under study take various novel spatial forms and they have flexible operating policies such as flexible seating and flexible work hours. We also found that it would be difficult to change existing business practices and typical ways of performing tasks, without changing the bureaucratic spatial designs and layouts. Future studies are suggested to examine how spatial structures and layouts of offices have impacts on space utilization, collaboration, creativity, and job satisfaction.

• 성인간호학회지
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• 제28권5호
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• pp.572-584
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• 2016

Purpose: The purpose of this study was to explore the subjective experience of job stress among nurses working in long-term care hospitals. Methods: A phenomenological approach was used for the study. Data were collected from May to June, 2016 using open-ended questions during in-depth interviews. Participants were nurses working in long-term care hospitals and had reported experiences of stress. Six nurses participated in this study. Results: Six themes emerged from the analysis using Colaizzi's method: (a) Heavy workload and responsibility due to nurse shortage, (b) Getting exhausted by caring for cognitively impaired patients, (c) Feeling pressure due to conflict with patients' family, (d) compassion for patients who are getting worse, (e) Low value in being a long-term hospital nurse, and (f) Efforts to overcome stress. Conclusion: Sufficient labor supply, environmental improvements, program for improving interpersonal skills, education and counseling on end-of-life care, and recognition improvement about long term hospital are suggested to reduce the job stress of long-term hospital nurses.

• 가족자원경영과 정책
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• 제18권2호
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• pp.37-54
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• 2014

This study investigates fathers' demands for fathering education. Data from eight married, working men was collected through in-depth interviews. The interviews were intended to examine their father-role, working life, balance between work and family, and demand for the educational programs for fathers with particular regard to the themes, contents, and arrangement strategies they desire of the programs. The results show that fathers have a high demand for learning detailed methods of childrearing such as how to effectively sooth and play with their child(ren). Further, it was discovered that job flexibility is the major variable that determines a man's satisfaction with his parental role. Various information about possible arrangements of fathering education was collected from the interview data, such as desired themes, number of sessions, size of the educational program, volunteer role of participants, and focus of the course (e.g., many indicated interest in focusing on gender equality). This study reveals that greater detail, more effective contents, and efficient managerial strategies are required in fathering education in order to impart broader perspectives and knowledge about how to enhance the relationship between father and child(ren).

• 대한안전경영과학회지
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• 제17권3호
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• pp.185-193
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• 2015

There are so many definition of good work but generally job quality can be useful to analyze the good work. Good work may include some factors about health or working environment. This paper was planned to investigate the level of job quality in Korean employees. Especially comparison of health status between low an high job quality can be analyzed. Korean Working Conditions Survey was used. The various job characteristics were categorized into 6 component of job quality using factor analysis. Statistically mean difference test and cross-tabulation analysis were used to identify the difference of health status and distribution of the level of job quality. The result has shown the different distribution of the level of job quality by the economic sectors and occupations statistically significant. The positive cases of all of six components of job quality was 2.1% of Korean employees and the negative cases of all six components of job quality was 1.5%. The subjective general health status was correlated with job quality but work-related stress was negatively correlated with the level of job quality. This study was heuristic one, more depth analysis will be needed to identify the relationship and causation of job quality and health status.