• 한국지역사회생활과학회지
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• 제19권4호
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• pp.597-609
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• 2008

The purpose of this study was to examine the effects of stress on child care teachers' with relation to job turnover, occupational turnover and the moderating role of personal accomplishment. The subjects were 153 child care teachers in Gyeonggi-Do. Data was analyzed through Pearson's correlation, multiple regressions using the SPSS12.0. This study showed that work overload and administrative problems in child care centers were significant predictors of a teachers' intention to change their job. Also, the stresses of human relations such as with children or co-workers were significant predictors of a child care teachers' intention to change occupation. Personal accomplishment was suggested to reduce the negative results of work overload and stress.

• 대한기계학회논문집A
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• 제25권4호
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• pp.662-670
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• 2001

We evaluate the effectiveness and validity of J(sub)e, which comprehensively describes the effects of specimen geometry and loading type, in predicting the fatigue life of auto seat belt anchor panel. We first simplify the heat affected zone model to reduce the number of finite elements. We then establish finite element models reflecting the actual overload behavior of 3 types of seat belt anchor specimens. Using finite element models elaborately established, we obtain the effective crack driving parameter J(sub)e composed of its ductility-dependent modal components. It is confirmed that the J(sub)e concept successfully predicts the fatigue life of multi-spot welded panel structures represented by auto seat belt anchors here.

• 대한전자공학회논문지
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• 제25권7호
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• pp.819-825
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• 1988

An 1-bit DPCM image coding method is presented. Our method is specially designed to reduce the slope overload which seems to be the major performance degradation factor in 1-bit DPCM. In the present algorithm, based on the classification of neighborhoods by its flatness, slope strength and direction, predictor and quantizer operate adaptively through switching action. Compared with some other methods by computer simulation, proposed method shows improved performance in image quality as well as in signal to noise ratio. This gain mainly comes from the reduced slope overload and seems large to compensate the increased complexity in prediction. As a post processing, Lee filter is used to reduce the granular noise subjectively annoying in flat region.

• 전자공학회논문지A
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• 제32A권4호
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• pp.32-39
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• 1995

In this paper, a timer thresholds tuning algorithm is proposed, satisfying the required response time for traffic with time-critical applications and asynchronous traffic in FDDI network. Under light and medium load, priorities and timer thresholds play a minor role for medium access control. In these cases all quenes are served exhaustively with a ver high service probability and the packet loss probability approaches almost zero. Under overload condition, however, the performance of the FDDI Network is completely determined by the selection of the timer thresholds. The timer thresholds tuned by mathematical results is confirmed by simulation results using SIMAN/UNIX package. The allocation of guaranteed bandwidth can be controlled easily by tuning the timer thresholds according to the proposed rules.

• 대한안전경영과학회지
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• 제16권1호
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• pp.89-99
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• 2014

This paper reviewed the relationship between job demands/resources and safety compliance, and the mediating effect of job burnout. Based on the responses from 247 employees, the results of multiple regression analysis appeared as follow; 1) two demands factors(role ambiguity and role overload) effect positively on safety compliance. 2) job resources factors(autonomy and social support) effect negatively on safety compliance. 3) job burnout effects negatively on safety compliance. 4) job burnout mediates between 4 job demands/resources(role ambiguity and role overload, autonomy, social support) and safety compliance.

• Journal of Welding and Joining
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• 제19권6호
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• pp.652-657
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• 2001

To analyze and predict crack initiation position and propagation directions on the spot welded area are very important for strength design of the automobile body structure. It is necessary to test by method considering random loads with variable amplitude for strength design of vehicle body structure, because driving cars are actually subjected to random loads with variable amplitude in the road. Although this condition, nearly all tests haute been performed under constant load conditions in the laboratory because it is impossible to replay like an actual conditions. In this study, using in-plane bending type specimens, the overload factor affecting on the fatigue strength, crack initiation and propagation directions of spot-welded specimens have been studied.

• 한국화재소방학회논문지
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• 제16권3호
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• pp.56-60
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• 2002

최근 전계-열계해석 소프트웨어의 발전에 힘입어 전계-열계 해석 이론을 바탕으로 컴퓨터 시뮬레이션에 의한 전기화재의 정확한 원인분석과 조사가 체계적으로 연구되고 있으나, 매우 미흡한 실정이다. 따라서 본 논문에서는 국내 L사 제품(600V, VVF)의 전선을 모델로 하여 과부하 및 단락사고시 발생되는 전류 크기에 따른 전선의 열해석을 전계-열계 유한요소법(Flux2D)을 통하여 컴퓨터 시뮬레이션 하고자 한다.

• 전기학회논문지
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• 제59권10호
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• pp.1733-1740
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• 2010

KPX(Korea Power Exchange) predicts that summer peak load will be 70,700MW and system overload will be 150% from contingency analysis. This paper presents a method to operate power system at 2010 summer peak. about equipment variation, power system variation, analysis results of voltage stability, and the method to relief overload by comparing 2009 and 2010. Especially, transmission constraints to prevent global contingency in Korea power system and the role of SPS(Special Protection System) to prevent voltage collapse when fault occurs are introduced.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2008년도 제39회 하계학술대회
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• pp.446-447
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• 2008

In this paper, a calculation method of the short-time emergency by considering a initial load level and overload time is presented. short-time emergency analyze transient thermal rating and Long-time emergency analyze steady-state thermal rating. Using the suggested method in the paper, increasing the short-term allowable current.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2015년도 제46회 하계학술대회
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• pp.744-745
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• 2015

This paper deals with magnetic characteristic analysis of axial flux permanent magnet coupling according to overload using analytical method. When magnet coupling has a slip, the eddy current induced in PM with conductivity. This eddy current make a distorted flux density. In this paper, we analyze the distorted flux density. The analytical results are validated extensively by comparing with 3d finite element analysis.