• Journal of the Korea Society of Computer and Information
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• v.15 no.10
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• pp.191-200
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• 2010

The "intelligent internet power outlets" realized in this study use Internet environment to connect electrical and electronic products to the Net as well as to enable remote monitoring and control. They also have temperature and light sensors, and even offer scheduling options by means of a universal calendar run by an inner real-time timer. Furthermore, they control 4 outlets handling 4 external input conditions and infrared remote control with easy-to-use functions for home automation control. The user interface is equipped with an embedded Web server and UDP protocol handler, and which also allows special control programs be used with the Web browser. Thus, installing this real-time power control function with optimal scheduling and various communication functions will provide you with energy-efficient power outlets outfitted with the increasingly popular "standby power" electric power efficiency.

• Journal of Advanced Marine Engineering and Technology
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• v.35 no.2
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• pp.288-294
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• 2011

In this paper, the FPGA-based SoC board (Xilinx Virtex-4 ML401 EVM) is adopted to control electrical power inverter system. For marine application, its performance is shown on PC-based system for monitoring electrical characteristics of a power inverter using by the NMEA 2000 protocol. This power inverter system is achieved in Real-Time monitoring and control by dual micro-processor operation on embedded FPGA-based SoC board. One micro processor is for control (Control processor) electrical power inverter using by PWM signal. And the other microprocessor (Communication processor) is for communication with PC-based monitoring system. The two-processor is communicating each other using by dual-port ram (DPRAM). PC-based system user can control and monitor information of the electrical power inverter via NMEA 2000 based communication processor. Control and monitoring information includes the inverter status and configuration. SoC board converts this information to Parameter Group Numbers (PGNs) in the NMEA 2000 protocol. This system can be applied to marine power electronics for distributed power generation, transmission or regulation systems on the ship.

• The Journal of the Convergence on Culture Technology
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• v.9 no.1
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• pp.697-702
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• 2023

Recently, with the introduction of drones, a core technology of the 4th industrial revolution, various convergence education using drones is being conducted in school education sites. In particular, drone theory and practice education is being conducted in connection with free semester classes and career exploration. The drone convergence education program has higher learner satisfaction than simple demonstration and practice education, and the learning effect is high due to direct practical experience. However, since practical education is being conducted for a large number of learners, it is impossible to restrict and control the flight of a large number of drones in a limited place. In this paper, we propose a monitoring system that allows the instructor to monitor multiple drones in real time and learners to recognize collisions between drones in advance when multiple drones are operated, focusing on education operated in schools. The communication module used in the experiment was equipped with GPS in Murata LoRa, and the server and client were configured to enable monitoring based on the location data received in real time. The performance of the proposed system was evaluated in an open space, and it was confirmed that the communication signal was good up to a distance of about 120m. In other words, it was confirmed that 25 educational drones can be controlled within a range of 240m and the instructor can monitor them.

• Proceedings of the Korean Society of Propulsion Engineers Conference
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• 2009.05a
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• pp.345-349
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• 2009

This test cell is developed to the institutes or laboratories research and study gas turbine engine for academic purpose with this test data to provide the fundamentals of operational mechanism and structural configuration, and further to verify thermodynamic calculation The test cell is installed to monitor and compare real-time data with reference engine model performance simulation data. using by NI DAQ(Data acquisition)device and LabVIEW program based on 30lbf-micro turbojet engine.

• Proceedings of the KIEE Conference
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• 2011.07a
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• pp.732-734
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• 2011

본 논문에서는 [SPD와 Sensing 회로를 내장한 영상 전송 및 장애관리시스템 설계 및 구현에 대하여 기술하였다. STP 케이블을 이용하여 영상신호 및 제어신호, 장애정보신호, SPD신호로 총 4종류의 신호를 STP케이블 Pair별로 구성하여 장거리(2km) 전송하도록 하여 전송거리와 배관, 배선의 제약을 해결하였고, 경제성에서도 타 케이블 보다 우위를 점하고 있으며, 각각의 카메라별 전송신호 및 영상, 장애정보와 전원공급 및 SPD 상태, 감시와 녹화를 위한 각각의 장비별 전원공급 및 SPD 상태를 이력관리와 함께 관리할 수 있는 통합 관리프로그램으로 관리자가 수백대의 카메라를 효율적으로 관리할 수 있도록 설계 및 구현하였다.

• Electronics and Telecommunications Trends
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• v.26 no.4
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• pp.90-104
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• 2011

천리안 위성은 우리나라 최초의 정지궤도 복합위성으로 국내의 여러 국책연구기관이 공동으로 참여하였다. 천리안 위성 프로그램에서 ETRI는 천리안 위성의 통신탑재체 개발 및 위성관제시스템 개발을 담당하였다. 천리안 위성은 2010년 6월 27일 성공적으로 발사되어 1년이 지난 현재까지 무사히 본래의 임무를 수행 중이다. 본 지면에서는 ETRI가 개발하여 천리안 위성에 실은 통신탑재체의 개발과정과 위성을 감시 제어하는 관제시스템의 개발과정에 대하여 살펴보기로 한다.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 1997.10a
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• pp.319-322
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• 1997

In vector control technique, stator currents of an induction motor are transformed to equivalent d-q currents in reference frame consist of d and q axis, each of which is coincide with flux and torque direction respectively. In this paper, the new algorithm is suggested where the stator current through an induction motor torque is monitored by using a vector control method where an additional equipment is not need. The G-programming is used to apply the suggested algorithm in the experiment and this is applied to an actual system to monitor the torque value of an induction motor on real time. To solve the vibration trouble of estimated torque caused from an unbalanced real rotating speed of an induction motor and measured rotating speed by suggesting the reconstructed in a method based on measurement current signal. This produced system testifies an accuracy of an induction motor through the experiment by comparing the reference value of the control method.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2002.10a
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• pp.467-470
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• 2002

Internet provides the useful method to monitor the current states of the machine tool no matter where a personnel is monitoring them. In this paper, a monitoring method of the torque of the machine tool's spindle induction motor using internet is suggested. The torque of vector controlled induction motor is estimated without speed measuring sensor. Only stator currents are measured to estimate the magnetizing current which is used to calculate flux linkage, rotor velocity and motor torque. Graphical programming is used to implement the suggested algorithm, to monitor the torque of an induction motor in real time and to make the estimated torque monitored on client computers. To solve the fluctuation problem of estimated torque caused from instantly varying rotating speed of an induction motor, the rotating speed is reconstructed based on the measured current signals. Mechanical part of the machine tool is also reconstructed using the data obtained from preliminary experiments. Torque of the spindle induction motor is well monitored on the client computers with 3% error range under various cutting conditions.

• Proceedings of the Korean Society of Computer Information Conference
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• 2018.01a
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• pp.165-166
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• 2018

IP카메라는 CCTV와 달리 값도 저렴하고 네트워크와 연결돼 PC와 스마트 폰을 통해서 실시간 조회 및 제어가 가능한 카메라이다. 이러한 장점에 힘입어 일반 가정이나 매장 등에서 도난 방지 및 감시를 위해 IP 카메라를 사용하는 사람들이 급격히 증가하고 있으며, 이에 따라 해킹을 통한 사생활 침해 문제도 같이 증가하고 있다. 이는 사용자들의 보안 인식이 턱없이 부족해 전문가가 아니더라도 손쉽게 프로그램과 사이트를 이용하여 해킹이 가능하기 때문인 것으로 사료된다. 따라서 본 논문에서는 해킹이 얼마나 쉽게 이뤄지는지, 어떠한 피해가 있는지, 그리고 이에 대한 해결방안을 제안한다.

• Proceedings of the KIEE Conference
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• 2007.07a
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• pp.406-407
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• 2007

에너지 관리시스템(EMS)은 전력계통 제어용 종합 자동화 설비로서 전력계통 운영의 효율성과 전력공급의 신뢰도 향상을 위해 운용되고 있다. EMS의 중요한 기능중 하나는 일련의 계통해석 애플리케이션들을 통해 전력계통의 상태를 해석하여 안전도를 감시하고 평가하는 것이다. 이러한 계통해석 애플리케이션들은 상호간에 데이터의 일관성을 유지하기 위해 하나의 동일한 전력계통모델을 사용하여야 하며, 주어진 시간에서 여러 개의 독립적인 기능이 순차적으로 실행하여 계통의 상태정보를 실시간으로 제공해야 하므로 데이터의 입출력이 매우 빠르게 이뤄질 수 있어야 한다. 따라서 이러한 실시간 애플리케이션이 요구하는 신뢰성과 성능을 만족하기 위해서는 공통 네트워크 모델 기반의 데이터베이스와 그에 맞게 애플리케이션을 위한 데이터 입출력 구조나 기능을 설계하여야 한다. 본 논문은 전력IT 국가전략과제로 개발 진행 중인 한국형 EMS(이하 K-EMS)의 계통해석 애플리케이션을 위한 데이터베이스의 구조와 애플리케이션을 구성하는 세부기능들의 구조를 이러한 관점에서 기술하고자 한다.