• 대한설비공학회지:설비저널
• /
• 제13권2호
• /
• pp.16-35
• /
• 1984

• 전기의세계
• /
• 제31권5호
• /
• pp.375-382
• /
• 1982

The optimum control of voltage and reactive power in large system requires large amounts of complicated calculation. If the large power system is controlled by the centralized control scheme, the necessary computing time, memory requirments and data transmission channels increase exponetially, and computer control of the system becomes difficult. Piecewise method which aims at the reduction of the difficulties of centralized control scheme is to decompose a large power system into several subsystems, each of which is controlled by a local computer and the control efforts of each subsystem are coordinated by a central computer. Unless sufficient coordination is made between subsystems, the control quality may become very poor. This paper describes how piecewise method can be applied in the optimal control of voltage and reactive power in large system, and presents effective calaulating algorithm for the solution of the problem. The numerical example for model system is presented here.

• 대한전기학회:학술대회논문집
• /
• 대한전기학회 1993년도 하계학술대회 논문집 A
• /
• pp.515-517
• /
• 1993

Dispatcher's Training simulation function are network analysis, power system modeling, supervisory control, and system security assessment. This function provides hand-on training for power dispatchers for operation of the nation control center in the future, it needs interface between simulator and expert system. This paper introduces DTS function which is adopted in the Central Load Dispatching Office.

• Journal of Power Electronics
• /
• 제16권5호
• /
• pp.1781-1790
• /
• 2016

This study focuses on the coordination control problem of multiple electrical excited synchronous motor systems. A robust coordination controller is designed on the basis of cross coupling and an interval matrix. The proposed control strategy can deal with load uncertainty. In addition, the proposed control strategy is applied to a high-power metal-rolling system. Simulation and experiment results demonstrate that the proposed control strategy achieves good dynamic and static performance. It also shows better coordination performance than traditional proportional-integral controllers.

• 조명전기설비학회논문지
• /
• 제13권1호
• /
• pp.69-76
• /
• 1999

본 논문에서는 도로 교통 정보설비의 유지관리를 위해 지능형으로 수행하는 원격감시제어 시스템을 제안하였다. 제안된 시스템은 국도 3호선에 설치되는 도로교통 설비에 대하여 유지관리를 수행하도록 시스템적으로 구축되어 있으며, 전송된 고장 정보는 중앙감시센터의 고장 정보 분석 알고리즘에 의해서 정보의 특성을 파악하도록 하였다. 분석 알고리즘은 신경회로망을 이용하여 다중으로 발생하는 고장정보에 대해서 지식 기반의 고장현상을 추론하도록 제안하였다. 고장 정보 분석 알고리즘의 유용성을 확인하기 위해 현장으로 실시간으로 전송되는 바이너리 신호의 패턴을 5가지 형태로 분류하여 성능을 분석하였으며, 이를 중앙감시센터에서의 유지관리용 운영환경 하에서 구현되도록 하였다.

• Geomechanics and Engineering
• /
• 제20권3호
• /
• pp.267-273
• /
• 2020

Solutions of the water pressure and groundwater inflow distribution along the tunnel perimeter in a half-infinite aquifer were investigated considering the conditions of the constant head and constant water pressure. It is assumed that the circular tunnel is buried in a fully saturated, homogeneous, isotropic and half-infinite space. Coordinate transformation technique was adopted, the problem of solving the control equations of water pressure in the Cartesian coordinate was transformed to that in the bipolar coordinate system, which can significantly simplify the derivation procedure of the water pressure and inflow distribution. The validation results show the accuracy and advantage of the proposed approach.

• 대한설비공학회:학술대회논문집
• /
• 대한설비공학회 2007년도 동계학술발표대회 논문집
• /
• pp.334-339
• /
• 2007

This paper is concerned with economic analysis and comparison between hybrid and central air conditioning system by TRNSYS simulation and Life Cycle Cost(LCC) analysis. Hybrid air conditioning system that is using VAV for interior zone and system air-conditioner for perimeter zone is installed in building A. Central air conditioning system is composed of VAV and convector. The simulation was carried out in mode temperature level control using TRNSYS 16. From the result of simulation and LCC analysis, hybrid air conditioning system was better than central air conditioning system in initial cost and energy consumption.

• Journal of Acupuncture Research
• /
• 제15권2호
• /
• pp.301-310
• /
• 1998

Infrared thermographic imaging visualizes noninvasively various abnormal condition by detecting the skin temperature. As the imaging represents the objective condition by the changes in blood flow under the control of autonomic nervous system, it is used to diagnosis and monitor the lumboscral radiculopathy. And asymmetry is important in the diagnosis of disc herniation. The most common type of disc herniation occurs psoterolaterally. This frequently causes nerve root compression leading to a radiculopathy in the distribution of the involved nerve root, most of which also provoke the asymmetric changes in thermography. Central disc herniation, which accounts for 5% to 35% of disc herniation, is typically associated with low back pain. But radiculopathy is usually abscent unless central disc heriniaton is large enough to cause compression of the cauda equina. To evalute the diagnostic value of the thermographic imaging in the diagnosis of central disc herniation, the imaging of 15 normal subjects and 48 patients with central disc herniation documented by CT scan were analyzed. The patients had either bilateral radiculophathy or no radiculopathy. The imaging of patient group with non rediculopathy did not show any significant thermal difference to control. While bilateral radiculopathy group reveled hypothermic pattern compared twith control. Thermal difference between left and right side did not present any significance in non radiculopathy group but hypothermia in bilateral radiculopathy group. Large herniation group demonstrated hyperthemic pattern while the others showed no significant change. Cranial caudal thermal difference did not show any difference between experiment groups. These results shows that infrared thermographic imaging can be used central disc herniation with bilateral radiculopathy, while it seems to little useful on the diagnosis of non radiculopathic disc herniation.

• Journal of Electrical Engineering and Technology
• /
• 제11권5호
• /
• pp.1100-1107
• /
• 2016

• 제어로봇시스템학회:학술대회논문집
• /
• 제어로봇시스템학회 2000년도 제15차 학술회의논문집
• /
• pp.479-479
• /
• 2000

Recently, IVS(Intelligent Vehicle Systems) or ITS(Intelligent Traffic Systems) are much concerned subjects of automotive industry. In this paper, we will introduce an Intelligent Online Driving System for a car. This system allows the driver to be able to drive the car just by operating an integrated joystick. The proposed driving system could be implemented into any car and the key point of the design is that the driver still can drive the car as normal without using the joystick. Our Intelligent Online Driving System includes the integrated joystick, steering wheel control system, brake and acceleration (B&A)pedals control system, and the central control computer system. Steering wheel and B&A pedals are controlled by AC servo-motors. The integrated joystick generates the desired positions and the embedded computer controls these two servomotors to track the commands given by joystick. The control method for two servo-motors is PID control.