• Korea Journal of Hospital Management
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• v.10 no.3
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• pp.1-24
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• 2005

This study purports to investigate the determinants of individual personnel rating of the employees at a university hospital in Seoul, Korea. The sample used in this study consisted of 63 nurses, 41 para-medical staff (Clinical Pathologist, and Radiologist), and 67 administrative staff. Independent variables of the study included the achievement level of the selection test (English, major subject, and interview), post-entrance development factors (education and training, career development, supervisory support, co-worker support, and organizational support), and demographic characteristics. Data for the achievement level of the entrance exam and years for the first promotion were collected from the administrative records of the study hospital, while data for the post-entrance development factors were collected from the survey with self-administered questionnaires using 5-point Likert Scale during June 10-25, 2003. Collected data were analyzed using hierarchical multiple regression. The results of the study showed that achievement level of the interview and English exam at the selection test, education and training, organizational support, and supervisory support while working at the hospital, and length of duration (below 8 years) and educational background (4-year college graduates) among demographic variables had significant positive effects on the personnel rating. The results of the study imply that hospital administrators should make an effort to improve the validity of the selection test, and to motivate the employees to receive more education and training.

• The Transactions of The Korean Institute of Electrical Engineers
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• v.65 no.5
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• pp.811-818
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• 2016

This paper suggests a structure of power control system in floating wave-offshore wind hybrid power generation system. We have developed an unified SCADA(Supervisory Control and Data Acquisition) system which can be used to monitor and control PCS(Power Conversion System) based on IEC61850. The SCADA system is essential to perform the algorithm like proportional distribution and data acquisition, monitoring, active power, reactive power control in hybrid power generation system. IEC61850 is an international standard for electrical substation automation systems. It was made to compensate the limitations of the legacy industrial protocols such as Modbus. In order to test the proposed SCADA system and algorithm, we have developed the wind-wave simulator based Modbus. We have designed a protocol conversion device based on real-time Linux for the communication between Modbus and IEC61850. In this study, SCADA system consists of four 3MW class wind turbines and twenty-four 100kW class wave force generator.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.24 no.4
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• pp.50-56
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• 2010

Supervisory Control and Data Acquisition Systems (SCADAs) is real-time monitor and control systems. SCADA systems are used to monitor or control chemical and transportation processes, in municipal water supply systems, electric power generation, transmission and distribution, gas and oil pipelines, and other distributed processes. SCADA refers to a large-scale distributed system. The supervisory control system is placed on top of a real time control system to control external processes. Emerging security technologies and security devices are decreasing the vulnerability of the power system against cyber threats. Dealing with these threats and analyzing vulnerabilities is an important task for equipment such as RTU, IED and FEP. To reduce such risks, we develop such a SCADA testbed. This paper presents the development of a testbed designed to assess the vulnerabilities SCADA networks(including serial communication).

• Proceedings of the Korean Information Science Society Conference
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• 2008.06b
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• pp.473-478
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• 2008

산업계에서의 제어시스템(Control System)은 크게 SCADA(Supervisory Control And Data Acquisition) 시스템, 분산 제어시스템(Distributed Control System, DCS), PLC 시스템 (Programmable Logic Controller System)으로 분류할 수 있다. 특히 전력분야의 SCADA 시스템은 목적상 실시간의 대규모 측정 정보 취득을 목적으로 운영되며, 실시간 및 이력 데이터베이스, 원격 데이터 취득, 다양한 데이터 처리, Supervisory Control 등 복잡한 기능과 다양한 전력시스템과의 정보교환이 요구된다. 다양한 전력시스템과의 정보 교환을 위한 표준화 요구에 부응하여, 향후 전력시스템은 표준화되고 공개된 정보모델을 활용한 통합시스템 개발이 요구된다. 본 논문에서는 전력 공통정보모델(CIM)과 애플리케이션 통합 정보기술을 이용한 전력시스템의 메시지 통합버스 설계에 대하여 기술하고자 한다.

• Journal of international Conference on Electrical Machines and Systems
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• v.1 no.2
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• pp.111-115
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• 2012

In this paper, a solar energy powered bicycle linked to a wireless sensor network (WSN) which monitors the transfer of solar energy to an electrical energy storage unit and an analysis of its effectiveness is proposed. In order to achieve this goal, a solar-powered bicycle with an attached ZigBee and a far-end wireless network supervisory system is setup. Experimental results prove that our prototype, solar energy powered bicycle, can achieve enough solar energy for charging a two lead-acid battery pack. As a result, the user, through use of a wireless network in the parking period can be kept aware of the data on the amount of immediate solar radiation, the degree of illumination, the ambient temperature, and electrical energy storage capacity information of the bicycle through an internet interface.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 1999.11a
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• pp.482-485
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• 1999

This paper proposes a remote supervisory controlling system of air compressor that is controlled by 80196KC microprocessor. In proposed monitoring system, air compressor located in long distance can be controlled In any condition by RS-232 serial communication. Change of data and abnormal signal of it can be also obtained. The validity of the proposed monitoring system is verified through digital simulations and experiments for air compressor driven by induction motor.

• Proceedings of the KIEE Conference
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• 1993.07a
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• pp.96-98
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• 1993

In accordance with increase of electrical power demanded, more efficient supervisory control of distribution system is required. This study contains development of MMI(man-machine-interface) system with GUI(graphic-user-interface), for the automatic power distribution system. The main function of MMI system are to edit network of power distribution, to view network, to warnning a breakdown and to management of data base for network. The GUI function of MMI system enables more efficient management of power distribution system.

• 제어로봇시스템학회:학술대회논문집
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• 1986.10a
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• pp.164-168
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• 1986

This paper describes an overview of the remote Supervisory Control And Data Acquisition (SCADA) System for automatic operation of Electric power system in KEPCO. And the example of improvement and development for effective operation of the SCADA is reported briefly.

• 전기의세계
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• v.36 no.6
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• pp.403-410
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• 1987

SCADA 시스템은 'Supervisory Control And Data Acquisition'의 약어로서 원거리에 산재하여 있는 설비들을 한곳에서 집중 감시, 제어할 수 있는 시스템을 일컫는다. SCADA 시스템은 다양한 산업설비(전력 설비, PIPE LINE 설비 및 UTILITY)가 복잡대형화 되어감에 따라 이들 설비와 계통들을 한곳에서 효과적으로 감시, 제어, 측정하여 이들 자료를 분석처리함으로서 설비 계통의 합리적 운용 및 효율적 에너지 관리를 위한 집중원방감시제어 시스템이다.

• Asia-Pacific Journal of Business Venturing and Entrepreneurship
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• v.11 no.6
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• pp.123-130
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• 2016

This study examined the effects of Leader-member exchange (LMX) on psychological empowerment and job performance, the mediating role of psychological empowerment in the relationship between LMX and job performance, and the moderating role of supervisory trust in the positive relationship between LMX and psychological empowerment. Data were collected from 290 employees in Korean Banks. Results of this study indicated that LMX was positively related to psychological empowerment and job performance, and that psychological empowerment was positively related to job performance. Results also indicated that psychological empowerment partially mediated the relationship between LMX and job performance. Especially, supervisory trust moderated the positive relationship between LMX and psychological empowerment such that the relationship was stronger when supervisory trust was high than it was low. Finally, theoretical and practical implications of the results were discussed.