• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 1993년도 추계학술대회 논문집
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• pp.512-517
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• 1993

The cold rolled strip meets continuously rising demands on the less deviation of thickness at the width direction of their rolled products. Especially, the special interest has been to find the methods to reduce the edge drop which influences seriously on the yield losses and the quality of the rolled products. In this study, the influence of hot coils on the thickness profile of cold rolled strip was analyzed. For obtainint the tapered work roll shig\ft conditions, the thermal crown and the flattening between the work roll and the strip were calculated, and the main parameters which have mostly effects on the edge drop were simulated. Also the obtained conditions from the simulation were applied to Tandem Cold Rolling Mill to investigate the change of the edge drop and the crown ratio depending on the amount of work roll taper and the length of contact of taper. The results of the application led to better thickness profile than conventional one.

• Nuclear Engineering and Technology
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• 제50권4호
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• pp.613-618
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• 2018

We are developing a shared remote control mobile robot for aerial work in nuclear power plants (NPPs); a robot consists of a mobile platform, a telescopic mast, and a dual-arm slave with a working tool. It is used at a high location operating the manual operation mechanism of a fuel changer of a heavy water NPP. The robot system can cut/weld a pipe remotely in the case of an emergency or during the dismantling of the NPP. Owing to the challenging control mission considering limited human operator cognitive capability, some remote tasks require a shared control scheme, which demands systematic software design and integration. Therefore, we designed the architecture of the software systematically.

• 융합정보논문지
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• 제11권11호
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• pp.178-184
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• 2021

본 연구는 사회복지사 연령에 따라 일-생활 균형에 영향을 미치는 요인을 실증적으로 비교·검증하기 위해 실시하였다. 연구대상은 전라북도에 소재하고 있는 사회복지관, 장애인복지관, 노인복지관에 근무하는 사회복지사이며 설문에 참여한 42개 시설 313부를 최종 분석에 활용하였다. 연구 방법은 사회복지사의 개인 요인(Level 1)과 기관 요인(Level 2)을 산정한 다층모형을 활용하였다. 주요 연구 결과는 다음과 같다. 첫째, 사회복지사의 일-생활 균형 전체 변량의 20.2%가 지역복지관별 차이로 나타났다. 둘째, 전체 사회복지사 일-생활 균형 영향요인을 분석한 결과 개인 요인에서는 직무요구와 가족 요구가 일-생활 균형에 부적(-) 영향을 미치며, 남성보다 여성이 일-생활 균형에 부정적인 것으로 나타났다. 주관적 건강과 경제상태는 일-생활 균형에 긍정적인 것으로 나타났다. 셋째, 연령별 사회복지사의 일-생활 균형의 영향요인 검증한 결과 모든 연령대에서 직무요구가 일-생활 균형에 부정적 영향력을 가지는 것으로 나타났다. 특히 30대에서 가족 요구와 남성보다 여성이 일-생활 균형에 부정적인 것으로 나타났으며, 경제상태도 일-생활 균형에 중요 영향요인으로 나타났다. 이러한 결과를 바탕으로 사회복지사 일-생활 균형 향상방안에 대해 논의하였다.

• Earthquakes and Structures
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• 제4권1호
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• pp.109-132
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• 2013

Current codes incorporate simplified methods for the prediction of acceleration demands on secondary structural and non-structural elements at different levels of a building. While the use of simple analysis methods should be advocated, damage to both secondary structural and non-structural elements in recent earthquakes have highlighted the need for improved design procedures for such elements. In order to take a step towards the formation of accurate but simplified methods of predicting floor spectra, this work examines the floor spectra on elastic and inelastic single-degree of freedom systems subject to accelerograms of varying seismic intensity. After identifying the factors that appear to affect the shape and intensity of acceleration demands on secondary structural and non-structural elements, a new series of calibrated equations are proposed to predict floor spectra on single degree of freedom supporting structures. The approach uses concepts of dynamics and inelasticity to define the shape and intensity of the floor spectra at different levels of damping. The results of non-linear time-history analyses of a series of single-degree of freedom supporting structures indicate that the new methodology is very promising. Future research will aim to extend the methodology to multi-degree of freedom supporting structures and run additional verification studies.

• 한국콘텐츠학회논문지
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• 제20권11호
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• pp.237-248
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• 2020

본 연구는 지역아동센터 종사자들의 직무열의 증진 및 소진 예방을 위한 정책적, 실천적 대안 마련에 필요한 기초자료를 제공하기 위해 직무요구-자원(JD-R) 모형을 기초로 업무환경(직무요구와 직무자원)과 직무열의, 직무소진 간의 관련성을 검증하는데 목적이 있다. 조사대상은 대전지역 지역아동센터 종사자 447명으로, 자기 기입식 설문조사방식으로 진행하였다. 분석에는 SPSS 23.0과 AMOS 23.0을 사용하였다. 연구결과를 요약하면, 첫째, 연구모형의 적합도는 CFI=.900, RMSEA=.077로 나타났다. 둘째, 주요변수 간 관련성을 살펴본 결과, ①직무자원이 많다고 인식할수록 직무열의가 높아진 반면, 직무소진에는 직접적인 영향을 미치지 않았다. ②직무요구가 많다고 인식할수록 직무소진이 높아졌으나 직무열의에는 직접적인 영향을 미치지 않았다. ③직무열의가 높을수록 직무소진은 낮아지는 것으로 확인되었다. 이러한 결과는 JD-R 모형을 근거로 지역아동센터 종사자의 업무환경이 직무열의와 직무소진에 미치는 영향력을 증명했다는 것에 학문적 의의가 있다. 또한 지역아동센터 종사자들의 직무열의 향상과 직무소진 감소를 위해 지역아동센터의 업무환경 변화를 도모해야 할 필요성에 대해 시사하고 있다.

• 가족자원경영과 정책
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• 제13권1호
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• pp.61-81
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• 2009

The purpose of this study was to investigate the policy demands of the family sector for work-family balance, with a focus on the child care and household labor provisions. For empirical analysis, data were collected from 197 dual-income families with at least one young child under age 10 in the metropolitan area via self-administered questionnaires. The major findings of this study were as follows. First, child care provisions for working mothers and fathers were insufficient and unfair, and the ratio of child care provisions offered by familial child care network was high. The characteristics of child care provisions for working parents were associated with family structure, working conditions, and demographic variables. Second, household labor provisions for working mothers and fathers were also insufficient and unfair, and the ratio of socialization was high. Third, the level of family satisfaction varied by the level of child care and household labor provisions, respectively, controlling family structure, working conditions, and demographic variables. The empirical results of the study provided policy implications for work-family balance.

• Safety and Health at Work
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• 제9권1호
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• pp.63-70
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• 2018

Background: Psychosocial risk management [Psychosocial Risk Management Approach (PRIMA)] has, through the years, been applied in several organizations in various industries and countries globally. PRIMA principles have also been translated into international frameworks, such as PRIMA-EF (European framework) and the World Health Organization Healthy Workplace Framework. Over the past 10 years, an oil and gas company has put efforts into adopting and implementing international frameworks and standards for psychosocial risk management. More specifically, the company uses a PRIMA. Methods: This study explores available quantitative and qualitative risk data collected through the PRIMA method over the past 8 years in order to explore specific and common psychosocial risks in the petroleum industry. Results: The analyses showed a significant correlation between job resources and symptoms of work-related stress, there was a significant correlation between job demands and symptoms of work-related stress, and there were differences in psychosocial risk factors and symptoms of work-related stress onshore and offshore. The study also offers recommendations on how the results can further be utilized in building a robust system for managing psychosocial risks in the industry. Conclusion: The results from the analyses have provided meaningful and important information about the company-specific psychosocial risk factors and their impact on health and well-being.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제16권1호
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• pp.97-115
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• 2022

Smart power grid is a user friendly system that transforms the traditional electric grid to the one that operates in a co-operative and reliable manner. Demand Response (DR) is one of the important components of the smart grid. The DR programs enable the end user participation by which they can communicate with the electricity service provider and shape their daily energy consumption patterns and reduce their consumption costs. The increasing demands of electricity owing to growing population stresses the need for optimal usage of electricity and also to look out alternative and cheap renewable sources of electricity. The solar and wind energy are the promising sources of alternative energy at present because of renewable nature and low cost implementation. The proposed work models a smart home with renewable energy units. The random nature of the renewable sources like wind and solar energy brings an uncertainty to the model developed. A stochastic dual descent optimization method is used to bring optimality to the developed model. The proposed work is validated using the simulation results. From the results it is concluded that proposed work brings a balanced usage of the grid power and the renewable energy units. The work also optimizes the daily consumption pattern thereby reducing the consumption cost for the end users of electricity.

• 한국건설관리학회논문집
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• 제3권4호
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• pp.139-144
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• 2002

Management of today's dynamic projects requires a shift of focus from product to process. The purpose of traditional project controls is to conform performance to plan. The purpose of lean project controls is to make the best possible choices at each point in time during the course of the project, as well as contributing knowledge to the parent organizations so they can learn from project experience. The Lean Construction Institute(LCI) proposed the Last Planner System(LPS) capable of accomplishing that purpose, principally through controlling the quality of planning and of management processes themselves, as distinct from concentrating exclusively on project performance. The case project was a pilot project for the implementation of the Last Planner. Consequently, the coordination of the work on this project was extremely successful. The project had its share of challenges. The coordination did not prevent design problems, or supplier errors, but helped the team deal with the problems effectively while maintaining the work flow. The last planner helped the contractors know: a) who will be doing what and where, b) what each one needs from the others, and c) what are the project priorities. The system itself created a more collaborative environment, because it 'demands' that the subcontractors address these issues.

• 산업공학
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• 제12권1호
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• pp.150-157
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• 1999

Mini-Mill process has been recently in operation at Pohang steel company, which enables more flexible steel coil production on customer demands. The effects of process parameters in Mini-Mill process need to be analyzed not only to make the process stable but also to improve product quality. This work aims to develop a regression model of Mini-Mill process using accumulated product data such that the process parameter effects on product tensile strength may be analyzed. The analysis shows that tensile strength is influenced mainly by the amount of components such as carbon, manganese, silicon, and sulfur. The effect of temperature is shown to be small. It is concluded that control of the components is much more responsible for both meeting the target and reducing the variation of the product tensile strength. Heat treatment is more useful in compensating tensile strength variations due to thickness differences and improving workability and other quality characteristics. More work is necessary for establishing regression expressions of the process that is reliable and accurate enough to dispense with the off-line inspection of the product tensile strength.