• Journal of the Microelectronics and Packaging Society
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• v.23 no.4
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• pp.119-123
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• 2016

In this paper, we have fabricated the position detection system with LED and optical sensor to detect a position and trace of robot through visible light communication (VLC). The fabricated position detection system did not have been affected by sunlight in outdoor and a fluorescent light in building. Because 4 LEDs, respectively, transmitted different signals, we have known the position of robot. And we have also observed a trajectory of robot in real time.

• Journal of the Institute of Electronics Engineers of Korea CI
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• v.47 no.4
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• pp.102-108
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• 2010

The photovoltaic system changes solar energy into DC by solar cell and this DC is inverted into AC which is used in general houses by inverter. Recently, the use of power of the photovoltaic system is increased. Therefore, the study of 3 phase solar system to transmit large power is very important. This paper proposes a method that finds simply faults and diagnoses the switch open faults of 3-phase pulse width modulation (PWM) inverter of grid-connected photovoltaic system. The proposed method in $\alpha\beta$ plane uses the patterns of trajectory image as the characteristic parameters and differenciates a normal state and open states of switches. Then, the result is made into tree. The tree is composed of 21 fault patterns and the parameters to classify faults are a shape, a trajectory area, a distributed angle, and a typical vector angle. The result shows that the proposed method diagnosed fault diagnoses, classified correctly them, and made a pattern tree by fault patterns.

• Proceedings of the KAIS Fall Conference
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• 2011.12b
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• pp.701-703
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• 2011

본 논문에서는 태양광병용형 식물공장과 USN 기술이 융합된 스마트 팜 모니터링 시스템을 설계 및 구현하고자 한다. 먼저 식물공장의 규모 및 내부 환경 정보 수집에 적합한 무선 통신 모듈과 온도, 습도, 조도, PPFD, 일사량 센서를 선택한 뒤, 각 센서를 통합하기 위한 PCB 모듈을 설계 및 제작한다. 제작된 통합센서는 송신부와 수신부가 포함되어 있으며 일정 간격마다 USN 게이트웨이의 요청에 의해 식물공장 내부의 환경 정보를 측정하여 서버로 전송하고, 전송된 데이터는 서버관리자에 의해 데이터베이스에 저장 및 각 환경 정보와 연관된 디바이스 제어 시 입력 요소로 사용된다. 향후 본 시스템을 확장 및 적용할 경우 태양광병용형 식물공장의 생산 효율이 증대되고, 에너지 소비 효율을 향상시킬수 있을 것으로 기대된다.

• 한국신재생에너지학회:학술대회논문집
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• 2007.11a
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• pp.260-263
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• 2007

The importance of natural light in building is known by all of us who experienced dark rooms. The sunlight system is very important from energy saving and human welfare point of view. The system consists of light-collecting module, light -transporting module and light-emitting module. The light-collection is used light reflection mirror, a prism for lighting bent, and lens for light condensing. The transportation of collected sunlight is used polished duct, tube, pipe and specially used fiber optic cable. This paper investigate research and development trends of sunlight system for advanced product.

• The Journal of The Korea Institute of Intelligent Transport Systems
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• v.12 no.1
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• pp.109-120
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• 2013

In this paper we proposed the design of the hybrid road lighting control system using solar-light generation. The proposed hybrid road lighting control system be power offer through hybrid controller using Solar-Light Generation, and it is designed so that it can control lighting up. To control supply of continuous power when during power shortages. And the gateway be transmit control command using zigbee to road lighting to ensure that automatic lighting control on human sensing. In this case, the gateway is apply the lighting control algorithm that decisions to the status of the system by a pre-set time schedule and be able to operate. In this paper, the proposed efficiency analysis results of a hybrid road lighting control system was consumed power of 129.6W per day, 3.8KW per month, 47.3KW per annual. As a result, it were able to increase the energy efficiency than existing lighting control system by reduce power consumption of 76.2% and the electricity prices of 76.8%.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.36 no.12B
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• pp.1595-1600
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• 2011

We analyzed the noise effect from artificial light and sunlight on the signal performance in visible light communication systems based on Intensity Modulation/Direct Detection(IM/DD). System performance was experimentally demonstrated by transmitting 50ksysmbol/s QPSK signals at 2MHz sub-carrier. And received signals were analyzed using EVM and RF spectrum. Finally, the system performance was improved by utilizing a visor and we confirm that the outdoor visible light communication was possible using IM/DD method.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.16 no.9
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• pp.1915-1922
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• 2012

In this paper, the Solar Inverter will be monitored by using the AJAX(Asynchronous JavaScript and XML). AJAX is the one of the technologies that can make the RIA(Rich Internet Application) with DHTML(Dynamic Hyper Text Makeup Language) and other java script technology. By using this, a strong application program that is comparable to the general application program can be made. With an existing data-processing technique, the request and response of data can't be processed dynamically on the same page. However, real-time monitoring of data and operation statuses can be confirmed by using the AJAX an asynchronous method of communication. Also without changing the page, the amount of data transmission used the AJAX with significantly small amounts of data to build a Solar Inverter monitoring system that is able to efficiently handle management and monitoring, operating all functions within one page.

• Proceedings of the KIEE Conference
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• 2005.07d
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• pp.2708-2710
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• 2005

본 연구는 매년마다 반복되는 하천의 수해예방 및 차후 대책수립을 위해 재해관리자가 원거리에서 다수의 하천 수위를 실시간 파악하도록 압력센서를 이용한 수위 계측기와 계측결과를 CDMA망을 통해 전송하는 데이터로거 시스템 개발에 관한 것이다. 본 연구에서 개발한 압력센서를 이용한 무선원격 수위계측기는 전원환경이 열악한 오지에 장착하여 수년간의 동작을 보장할 수 있는 계측시스템으로서, 태양광을 이용한 자가발전에 의한 전원 충전과, 차세대 무선 통신시스템을 장착하여 독립적으로 실시간 자료를 수집할 수 있는 특징들을 가진다.

• Journal of the Korea Convergence Society
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• v.2 no.3
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• pp.15-23
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• 2011

This paper deals with the analysis for the operation characteristic of PV 3 phase inverter, considering the state equation through d-q coordinates transformation, and proposes an algorithm of controlling current using PI(Proportional Integral) controller to control the output and the theory algorithm of sinusoidal PWM method to design inverter. And also this paper performs PV modelling using PSCAD/EMTDC S/W which is commonly used in analysis of distribution system and confirms effectiveness of the modelling proposed in this paper by analyzing and comparing the EMTDC/PSCAD simulation result with the theoretical method.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.19 no.10
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• pp.2450-2456
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• 2015

In this paper, we propose a real-time remote monitoring system for distributed solar power generation system. The proposed system consists of PVC, UTC, OTC and monitoring server. PVC collects the operational information from the PV's inverter via serial interface. The sensing data is transmitted to the server by wireless communications and stored in the DB server. The PV's status is monitored via UTC, and the operating of PVC and UTC are managed by OTC. In addition, by providing information about the power generated by PV system and failure diagnosis in real time, the proposed system shows the possibility of reducing the maintenance costs and improved failure recovery time.