• 대한기계학회논문집B
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• 제33권4호
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• pp.278-287
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• 2009

Plug-in hybrid electric vehicle (PHEV) with capability of being recharged from the power-grid will reduce oil consumption. Also, the PHEV will affect the utility operations by adding additional electricity demand for charging. In this research, the power-grid impact by demand of PHEV charging is presented and the optimal charging control strategy for utility operators is proposed with simulated data. The penetration of PHEV is assumed to be 50% in the circumstances of Korean passenger car market and Korean power-grid market limitedly. To obtain smooth load shape and utilize the surplus electricity in power-grid at midnight and dawn, the peak of charging demand should be controlled to be located before 4:00 a.m., and the time slot which can supply the electricity power to PHEV should be allowed between 1:00 a.m.$\sim$7:00 a.m.

• 조명전기설비학회논문지
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• 제26권4호
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• pp.22-27
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• 2012

In the study, an XML based platform is presented for LED dimming control. The XML platform is designed in an open architecture, providing with interoperability and scalability. Also, it enables the accommodation of off-the-shelf wired and wireless communication protocols and make it fast and easy to implement various application programs for LED dimming, comparing to the legacy platforms. In the study, a test best has been built for demonstration of the merits of the XML platform with dimming control by responding to the scenario of demand response event. Benefit calculation of the power saving and incentive from demand response shows the applicability and usefulness of the XML platform.

• 한국보육지원학회지
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• 제11권4호
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• pp.147-166
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• 2015

본 연구는 어머니의 심리적 통제와 유아의 기질-어머니의 요구수준 간 차이가 남아와 여아의 문제행동에 미치는 영향을 검증하고자 하였다. 연구 대상은 부산시와 경남지역의 세 개 사립유치원에 재원중인 만 4, 5세 유아 221명과 그들의 어머니였다. 유아의 문제행동은 담임교사가 보고하였고, 어머니의 심리적 통제와 유아의 기질-어머니의 요구수준 간 차이는 어머니가 보고하였다. 자료 분석을 위해 기술통계치를 산출하고, 상관분석과 위계적 중다회귀분석을 실시하였다. 연구 결과 활발한 기질에 있어서 유아의 기질-어머니의 요구수준 간 차이가 클수록 남아와 여아 모두 외현적 문제행동을 많이 보이는 것으로 나타났다. 반면, 외현적 문제행동에 대한 어머니의 심리적 통제의 영향은 유의하지 않았다. 한편 내재적 문제행동은 남아의 경우 어머니의 심리적 통제가 높을수록, 그리고 적응적 기질에 있어서 유아의 기질-어머니의 요구수준 간 차이가 클수록 많이 보이는 경향이 있었다. 그러나 여아의 내재적 문제행동의 경우에는 이러한 영향이 유의하지 않았다.

• 산업경영시스템학회지
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• 제35권1호
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• pp.24-31
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• 2012

This study is designed to predict the overall electric power load, to apply the method of time sharing and to reduce simultaneous load factor of electric power when authorized by user entering demand plans and using schedules into the user's interface for a certain period of time. This is about smart grid, which reduces electric power load through simultaneous load factor of electric power reduction system supervision agent. Also, this study has the following characteristics. First, it is the user interface which enables authorized users to enter and send/receive such data as demand plan and using schedule for a certain period of time. Second, it is the database server, which collects, classifies, analyzes, saves and manages demand forecast data for a certain period of time. Third, is the simultaneous load factor of electric power control agent, which controls usage of electric power by getting control signal, which is intended to reduce the simultaneous load factor of electric power by the use of the time sharing control system, form the user interface, which also integrate and compare the data which were gained from the interface and the demand forecast data of the certain period of time.

• 대한안전경영과학회지
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• 제14권2호
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• pp.91-101
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• 2012

To decrease employees' job stress in the viewpoint of occupational health is very important to improve the productivity and quality of labor. In this study, the job stress, and it's influence on job commitment and organizational commitment were investigated by the questionnaire survey of 259 industrial workers. As results, the majority of workers were under job stress resulted from job demand, job control, and coworker's support. The work times per a week and night work had significant relationships with job demand, and the maximum negative relationship between the work times per a week and job continuous commitment was found. Job demand had the significant relationship with job affective and normative commitment, and job control had the significant relationship with job normative commitment and organizational affective commitment. Moreover, job affective and normative commitment had the significant relationship with organizational continuous commitment. Finally, it was found that cyclic organic chain was composed of work times per a week, night work, salary, job demand, job control, job affective and normative commitment, and organizational affective and continuous commitment. The results of this study indicates that reducing cyclic organic chain is urgently necessary to increase employees' job satisfaction and company commitment.

• 한국직업건강간호학회지
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• 제17권1호
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• pp.55-63
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• 2008

Purpose: The purpose of this paper is to analyze the effect of job stress on work impairment. Method: 354 workers' data from Seoul and the Gyeonggi area were collected between February 1 and March 30 2006 by structured questionnaire. The questionnaire was meant to determine demographic data, job stress, and work impairment questionnaire. Data analyzed by SPSS 12.0 and AMOS 5.0 program. Results: Job stress was ranked job demand, insufficient job control, organizational system, lack of reward, job insecurity, interpersonal conflict, and occupational climate. The work impairment of completing work was increased when the stress of insufficient job control, lack of reward, job insecurity, and occupational climate were increasing. The work impairment of avoiding distraction was increased when the stress of job demand, insufficient job control, organizational system, lack of reward, job insecurity, and occupational climate were increasing. The stress of job demand, lack of reward, job insecurity, and occupational climate had an effect on avoiding distraction. The stress of lack of reward and occupational climate had an effect on completing work. Conclusion: If employers manage job stress of job demand, lack of reward, job insecurity, and occupational climate, their business will benefit.

• Journal of Information Processing Systems
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• 제18권6호
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• pp.763-769
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• 2022

Transportation allocation requires information such as storage location and order information. In order to guarantee the safe transmission and real-time sharing of information in all links, an intelligent transportation control system based on blockchain technology is designed. Firstly, the technical architecture of intelligent transportation information traceability blockchain and the overall architecture of intelligent transportation control system were designed. Secondly, the transportation management demand module and storage demand management module were designed, and the control process of each module was given. Then, the type of intelligent transportation vehicle was defined, the objective function of intelligent transportation control was designed, and the objective function of intelligent transportation control was constructed. Finally, the intelligent transportation control was realized by genetic algorithm. It was found that when the transportation order volume was 50×103, and the CPU occupancy of the designed system was only 11.8%. The reliability attenuation of the code deletion scheme was lower, indicating better performance of the designed system.

• 조명전기설비학회논문지
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• 제22권2호
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• pp.35-41
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• 2008

본 논문에서는 새로운 수요관리 자원으로 대두되고 있는 조광제어의 잠재량과 가치평가, 활용방안을 제시하고자한다. 현재 전력IT기술이 발전하고 있으며, 이는 수요관리 분야에도 많은 기회를 제공하고 있다. 특히 조광제어는 실시간 요금이 변하는 전력시장에서 전력IT 기술을 통해 그 가치를 드러내고 있다. 또한 본 논문에서는 조광자원이 변화하고 있는 전력산업 환경에서, 효율향상뿐 아니라 부하관리 측면에서도 매우 효과적인 수요자원임을 검증코자한다.

• 응용통계연구
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• 제23권3호
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• pp.559-571
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• 2010

본 연구는 직무스트레스 분야에서 가장 널리 연구 된 직무요구-통제 모형을 팀 수준으로 확대하여 개인 수준에서의 직무요구와 직무스트레스간의 관계를 재검증 하고, 이 관계를 조절하는 사회적 지지를 팀의 풍토로서 정의하여 팀 수준의 조절효과를 검증하는데 목적이 있다. 자료는 다양한 성격의 19개 조직의 34개 팀에서 수집하였으며 분석 결과, 개인 수준에서 직무요구가 직무스트레스를 유의하게 예측하였으며, 팀의 관계중시풍토는 직무요구와 직무스트레스간의 관계를 조절하는 것으로 나타났다. 또한 팀의 관계중시풍토는 리더의 개인배려행동과 유의하게 관련되었다. 마지막으로 본 연구의 제한점과 시사점 그리고 미래 연구에 대해 논의하였다.

• 제어로봇시스템학회논문지
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• 제12권7호
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• pp.631-636
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• 2006

In this paper, an algorithm of time series function forecasting using GMDH(group method of data handling) algorithm that gives more weight to the recent data is proposed. Traditional methods of GMDH forecasting gives same weights to the old and recent data, but by the point of view that the recent data is more important than the old data to forecast the future, an algorithm that makes the recent data contribute more to training is proposed for more accurate forecasting. The average error rate of electric power demand forecasting by the traditional GMDH algorithm which does not use data weighting algorithm is 0.9862 %, but as the result of applying the data weighting GMDH algorithm proposed in this paper to electric power forecasting demand the average error rate by the algorithm which uses data weighting algorithm and chooses the best data weighting rate is 0.688 %. Accordingly in forecasting the electric power demand by GMDH the proposed method can acquire the reduced error rate of 30.2 % compared to the traditional method.