• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.19 no.6
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• pp.191-196
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• 2019

In the case of urban railway facilities, the power supply should be maintained for the safe movement of passengers in communication facilities, disaster prevention facilities and boarding area security because of the confusion when power supply is cut off due to the nature of public transportation. In addition, considering that the number of trains is running on the urban railway line, it is necessary to operate at least 30 minutes for the bus stop and at least 1 hour for the communication and disaster prevention facilities. Therefore, it is essential to supply emergency power source to maintain stable operation of induction lamp and smoke exhaust system because main power is cut off in order to prevent further spread due to fire in case of the history of urban railway section or vehicle fires. Recently, UPS(Uninterruptible Power Supply) function to prevent power outage in emergency, emergency power generation combined with ESS function which saves electricity at nighttime price time, A hybrid power storage system with a UPS function.

• The Transactions of the Korean Institute of Electrical Engineers P
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• v.58 no.2
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• pp.196-201
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• 2009

In this paper, We developed specifications light-way lighting appliance for efficient construction Wiring embody lighting appliance is convenient for divergence of circuit and arrangement construction of lamp. Also, it can be shortened construction period because series construction is available. Improved product is high work efficiency because the volume is small and the weight is light. Power line and line of communication are received each tray, so equipment is secure. We believe that the product is available for gallery, museum, and parking lot etc.

• Proceedings of the KIEE Conference
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• 2001.07b
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• pp.1082-1084
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• 2001

This paper presents a design techniques for an electronic ballast of HID lamps. An electronic ballast for HID lamps usually employs a high frequency resonant inverter and voltage-to-frequency converter to control the output and a half-bridge and series resonant circuit are chosen for the ballast. In this paper, the new lighting method for the stable ignition regardless of lamp types is designed. And this type of ballast has some useful functions such as surge protection, thermal protection, and dimmable function. Moreover the powerline communication skill is also used to transmit a dimming control signal.

• Proceedings of the Korean Institute of Communication Sciences Conference
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• 1986.10a
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• pp.23-27
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• 1986

In this paper, The loss spectra between 1.1um and 1.7um were measured by cut-back method using tungsten-halogen lamp, a grating monochramator and an InGaAs detector. Typical fiber lengths measured were 30 meter. This result represent a further contribution to monomode fiber design and has been applied to come common profimes that are under study to optimize the fiber performance. It is very important that the parameter a. were designed more exactly and transmission of LPol mode in 1.55um. Therefore, Fiber designer have to be aware of the fact that this coupling loss and bending loss.

• Rapid Communication in Photoscience
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• v.4 no.2
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• pp.34-36
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• 2015

New spectroscopic characteristics of amorphous ferric hydroxide ($Fe(OH)_3$), interestingly in the near infrared (NIR) region, are presented in this study. The absorption spectrum of ferric hydroxide covers wide spectral regions from ultraviolet to NIR (200~900 nm). Unique emission bands were newly observed in the NIR regions (800~1400 nm). Several bands of this NIR emission are quiet well overlapped with the combinational vibrational absorption bands of water. From photothermal conversion study, very interestingly, temperature of aqueous mixture solution including the amorphous ferric hydroxide was significantly increased from ambient temperature to $38^{\circ}C$ for 30 minutes under irradiation of a standard helium lamp.

• International journal of advanced smart convergence
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• v.9 no.2
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• pp.123-128
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• 2020

We constructed a cooling system for solar cells using convection phenomena and investigated its cooling performance. The cooling system didn't need any driving power or water resources. The convection cooler manufactured with a right-triangle shape of an air duct was attached to the rear of the solar cell to confirm that cooling was performed using convection phenomena. When the ratio of duct width to attachment surface width was 3:7, and the ratio of entrance height and exit height of duct was 5:1, it showed the best cooling performance. Comparative experiments with solar cells without convection cooler showed that cooling effects from 16.5℃ to 20.9℃ occurred after 40 minutes exposed to the 1300W Xenon lamp condition.

• Proceedings of the KAIS Fall Conference
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• 2009.05a
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• pp.645-648
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• 2009

본 논문에서는 신재생에너지 활용을 위한 휴대용 하이브리드 태양광 풍력 발전 시스템을 제안한다. 제안하는 태양광 풍력 복합 발전 시스템을 상용전기와 연계하여 사용할 경우를 고려하여 중대형 풍력 발전 시스템용 인버터와는 다른 특성이 요구되는 소형풍력 발전 시스템용 인버터와 독립형으로의 사용을 위해 축전지 충방전 컨트롤러를 개발한다. 20W의 Solar Power, 50W의 Wind Power, 1개의 Radio-recorder, 2개의 DC 7W/9W lamp. 축전지 Controller, 24H/40AH Maintenance-free battery 사양을 갖는 발전 시스템을 제작하고 필드 테스트를 통하여 성능을 검증한다.

• Proceedings of the IEEK Conference
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• 2007.07a
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• pp.479-480
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• 2007

It is study about implementation of the home network system that used an ubiquitous sensor network and an embedded system in this paper. PXA270 and CC2420 were used, and the home server of a wireless sensor home network system composed it. A wireless control system is composed of a gas valve, a DC motor, a lamp and a door rock. A wireless detection system is composed of a gas detection sensor, a movement detection sensor, an extension detection sensor The wireless detection system that was an environment sensing system was composed of temperature, humidity, mic, illuminance, a speed-up, infrared rays temperature sensing module, and modular, other RFID established an USB camera, and an ubiquitous home network was composed.

• Proceedings of the Korea Information Processing Society Conference
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• 2009.04a
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• pp.1102-1105
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• 2009

최근 전국 각지의 설치되어 운영/관리 되고 있는 가로등 사업의 주요 이슈는 가로등/보안등으로 사용되는 광원 자체가 기존의 노란색 나트륨 등에서 CDM(백색 고휘도 메탈 등)계열로 급속히 전환되고 있다는 것이다. 빠르게 발전하는 근거리무선 통신 규약인 Zigbee를 통한 효율적인 관리와 에너지 효율성에 대한 관심도 증대되고 있다. 그러므로 본 연구에서, 저전력 Zigbee 근거리무선 통신 프로토콜을 이용한 네트워크 구축을 통하여 가로등간의 양방향 통신 시스템을 구축한다. 또한 이 연구를 통하여 에너지 효율성 증대와 운영과 관리의 편의성을 제시하고, 사업화 타당성을 분석한다.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.23 no.2
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• pp.169-174
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• 2023

Currently, overall power usage is also increasing as power demand such as homes, offices, and factories increases. The increase in power use also raised interest in standby power as a change in awareness of energy saving appeared. Home and office devices are consuming power even in standby conditions. Accordingly, there is a growing need to reduce standby power, and it aims to have standby power of 1W or less. An intelligent outlet uses a near-field wireless network to connect to a home network and cut or reduce standby power of a lamp or appliance connected to an outlet. This research aims to develop a monitoring system and an intelligent outlet that can remotely monitor the amount of electricity used in a lighting lamp or a home appliance connected to an outlet using a short-range wireless network (Zigbee). Also, The intelligent outlet and monitoring system developed makes it possible for a user to easily cut off standby power by using a portable device. Intelligent outlets will not only reduce standby power but also be applicable to fire prevention systems. Devices that cut off standby power include intelligent outlets and standby power cutoff switches, so they will prevent short circuits and fires.