• 한국의류학회지
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• 제35권10호
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• pp.1150-1160
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• 2011

This study investigates i) the effect of salesperson's self efficacy and work overload on emotional labor and ii) the mediating role of emotion. A survey questionnaire is developed and implemented on salespersons working in the fashion retail stores of department stores. The measurement scales are composed of emotional labor, self efficacy, work overload and emotion. A total of 112 responses are analyzed by confirmatory factor analysis and a structural equation model with AMOS18.0. The results are as follows. Firstly, self efficacy has direct effect on both deep acting and surface acting of emotional labor without the mediating effect of emotion. Self efficacy has a positive effect on deep acting. Secondly, work overload has a negative effect on emotion. Job emotion has positive effect on deep acting and it has a negative effect on surface acting. Thirdly, emotion has a significant mediating effect between work overload and emotional labor. Finally, implications for personal management and job design in the fashion retail organizations are suggested.

• Journal of Electrical Engineering and Technology
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• 제13권3호
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• pp.1079-1088
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• 2018

A line overload emergency control strategy based on the source-load synergy coefficient is proposed in this paper. First, the definition of the source-load synergy coefficient is introduced. When line overload is detected, the source-load branch synergy coefficient and source-load distribution synergy coefficient are calculated according to the real-time operation mode of the system. Second, the generator tripping and load shedding control node set is determined according to the source-load branch synergy coefficient. And then, according to the line overload condition, the control quantity of each control node is determined using the Double Fitness Particle Swarm Optimization (DFPSO), with minimum system economic loss as the objective function. Thus load shedding for the overloaded line could be realized. On this basis, in order to guarantee continuous and reliable power supply, on the condition that no new line overload is caused, some of the untripped generators are selected according to the source-load distribution synergy coefficient to increase power output. Thus power supply could be restored to some of the shedded loads, and the economic loss caused by emergency control could be minimized. Simulation tests on the IEEE 10-machine 39-bus system verify the effectiveness and feasibility of the proposed strategy.

• International Journal of Naval Architecture and Ocean Engineering
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• 제13권1호
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• pp.278-291
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• 2021

This paper applies load variation method to predict speed-power-rpm relationship along with propulsive performances in regular head waves, and to derive overload factors (ITTC, 2018). 'Calm-water tests' and 'resistance test in waves' are used. The modified overload factors are proposed taking non-linearity into consideration, and applied to the direct powering, and resistance and thrust identity method. These indirect methods are evaluated through comparing the speed-power-rpm relationships with those obtained from the resistance and self-propulsion tests in calm water and in waves. The objective ship is KVLCC2. The load variation method predicts well the speed-power-rpm relationship and propulsion performances in waves. The direct powering method with modified overload factors also predicts well. The resistance and thrust identity method with modified overload factor predicts with a little difference. The direct powering method with overload factors predicts with a relatively larger difference.

• 한국심리학회지 : 문화 및 사회문제
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• 제25권1호
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• pp.27-53
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• 2019

본 연구는 테크노 스트레스의 유발요인 중 테크노 과중과 테크노 침해가 심리적 계약 위반에 미치는 영향을 확인하고, 심리적 계약 위반이 정서적 소진에 어떠한 영향을 미치는지 그 과정을 살펴보기 위해 이루어졌다. 또한 테크노 과중 및 테크노 침해와 심리적 계약 위반간의 관계에서 발언행동의 조절 효과를 검증하고자 했다. 이를 위해 40문항으로 구성된 자기보고식 설문지를 이용하여 현재 조직에서 종사하고 있는 직장인들을 대상으로 설문조사를 실시하였으며, 296명의 자료가 분석에 사용되었다. 분석 결과, 테크노 과중 및 테크노 침해를 높게 지각하는 구성원일수록 심리적 계약 위반을 더 경험하는 것을 확인할 수 있었으며, 테크노 과중과 테크노 침해가 심리적 계약 위반을 매개하여 정서적 소진을 높인다는 것을 확인할 수 있었다. 또한, 발언행동의 수준이 높을수록 테크노 과중 및 테크노 침해와 심리적 계약 위반 간의 정의 관계가 감소하는 조절 효과가 관찰되었다. 이러한 연구 결과를 바탕으로 본 연구가 갖는 시사점과 한계점, 향후 연구를 위한 제언에 대해 논의하였다.

• 한국정밀공학회지
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• 제34권3호
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• pp.179-184
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• 2017

Recently, traffic accidents and damage on the highway have increased because of overloaded vehicles. The existing overload-detecting system has a low accuracy rate. An overload-detecting system using a weigh-in-motion (WIM) system has been developed to solve this problem. The WIM system can be used to detect overloaded vehicles by measuring the weight of the vehicles. The WIM system is divided into high-speed and low-speed types. The inaccuracy rate in the low-speed WIM system results mainly from the low response rate of the sensor when the velocity is moving at more than 20 km/h. In this study, a low-speed overload-detecting pad with a hydraulic structure using a WIM system was developed to make the system more accurate. The structural and formal analysis was carried out by using a finite element method (FEM) in order to analyze the structural stability and the extrusion velocity of the system. In addition, a static load test was performed to confirm the linearity and accuracy of the pad.

• 산경연구논집
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• 제9권9호
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• pp.35-44
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• 2018

Purpose - In endless competition, companies pursue cost reduction and work efficiency. So, entrepreneurs try to increase job intensity, which may lead to job stress and high turnovers because of job burnout. But, Information systems are acknowledged as a work support tool that secures work convenience and the productivity of employees. In this study, we aimed to confirm the effects of information systems in reduing the work overload of employees in a human resource intensive industry. Research design, data and methodology - This is based on the job demands-resources model, conducting an empirical analysis of surveys given to hospital employees working in a human resource intensive industry. Results - The research revealed that information systems reduced the work overload of employees in a human resource intensive industry. Conclusion - This study confirmed the effects of information systems as a job resource based on JD-R theory, and presentation of empirical results indicated that information systems alleviate employee job overload and increases job satisfaction in the medical services industry. In the medical services industry, using electronic health record system decreases in work overload, which results in employees gaining time for self-development and time management, reducing job stress, and leading to job satisfaction.

• 한국정보시스템학회지:정보시스템연구
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• 제20권2호
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• pp.155-176
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• 2011

The use of mobile office systems has been expanded due to the smartphones' rapid diffusion in Korea, and it has brought a new work environment that is different from traditional working patterns. In this study, the unique attributes of mobile office systems, such as ubiquity, usefulness, complexity, and insecurity, are examined along with the impact of these attributes on work overload and job stress. Based on transaction-based model of job stress, organizational support was applied as a stress inhibitor and also the moderator between work overload and job stress. The findings of this study show that ubiquity increases usefulness of mobile office systems; complexity increases both work overload and job stress; and insecurity increases job stress. Surprisingly, usefulness increases job stress, which means employees who perceive the efficiency of mobile office systems higher may feel more job stress. Organizational support for mobile office systems significantly shows the moderating effect, but no direct mitigating effect on job stress. The theoretical and practical implications in order to mitigate the side effects of mobile office systems based on the research findings are thoroughly discussed.

• 대한기계학회논문집A
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• 제25권3호
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• pp.470-477
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• 2001

Constant ΔK fatigue crack growth tests were performed by applying an intermediate multiple overload for S45C steel. The purpose of the present study is to investigate effects of specimen thickness at various baseline stress intensity factor range levels (ΔK(sub)b), overload application position (a/W) and overload application frequency (OL(sub)HZ) on fatigue crack growth retardation behavior. The principal results are summarized as follows. The amount of retardation for a given ΔK(sub)b level is increased with increasing the baseline stress intensity factor range level for all specimen thickness. The normalized minimum crack growth rate is increased with increasing the specimen thickness, except for ΔK=45MPa√m. The retardation cycle is decreased with increasing a/W and increased with OL(sub)HZ.

• 한국통신학회논문지
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• 제19권8호
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• pp.1578-1586
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• 1994

본 논문에서는 축적프로그램 제어시스템이 분산구조형인 경우 이에 적합한 새로운 과부하 제어 방법을 제안한다. 분산구조에서 호 처리 기능의 대부분은 가입자 제어 프로세서(SP)에 분산되어 있지만, 번호 번역과 루팅제어와 같은 몇가지 기능들은 중앙 프로세서(CP)에 집중되어 있으므로 중앙 프로세서의 성능은 교환시스템에서 매우 중요하다. 그러므로 과부하시 CP의 적절한 동작을 보증하는 과부하 제어 방법이 필요하다. 제안한 과부하제어 방식의 성능을 평가하기 위하여 시뮬레이션을 수행하였으며, 이를 통하여 제안한 과부하 제어 방법이 매우 효율적임을 입증하였다.

• International Journal of Fluid Machinery and Systems
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• 제2권4호
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• pp.315-323
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• 2009

Pressure oscillations triggered by the unstable interaction of dynamic flow features of the hydraulic turbine with the hydraulic plant system - including the electrical design - can at times reach significant levels and could lead to damage of plant components or could reduce component lifetime significantly. Such a problem can arise for overload as well as for part load operation of the turbine. This paper discusses an approach to analyze the overload high pressure oscillation problem using computational fluid dynamic (CFD) modeling of the hydraulic machine combined with a network modeling technique of the hydraulic system. The key factor in this analysis is the determination of the overload vortex rope volume occurring within the turbine under the runner which is acting as an active element in the system. Two different modeling techniques to compute the flow field downstream of the runner will be presented in this paper. As a first approach, single phase flow simulations are used to evaluate the vortex rope volume before moving to more sophisticated modeling which incorporates two phase flow calculations employing cavitation modeling. The influence of these different modeling strategies on the simulated plant behavior will be discussed.