• Journal of the Korea Institute of Information and Communication Engineering
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• v.13 no.11
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• pp.2349-2354
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• 2009

Due to growth of electronics and control devices, automation and situational awareness systems have been applied by automobile. Vision systems with the introduction of unmanned system being actively developed, but are still high price and visual information is passed through the cable, because of cars are difficult to install. In this paper, can be installed inside the car at low-cost, simple image processing device through a wireless communication know the obstacles and the alarm system based on Zigbee wireless communication, infrared and ultrasonic sensors to monitor the situation through with easy parking cars outside the system design was implemented.

• Proceedings of the KIEE Conference
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• 2011.07a
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• pp.410-411
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• 2011

본 논문에서는 태양광 전원, 배터리, 마이크로터빈, 스마트 홈 등 다양한 목적과 특성을 가진 요소로 구성된 마이크로그리드를 효율적으로 제어, 관리하기 위한 분산 지능형 제어원리를 제안한다. 기존의 중앙집중식 제어원리는 중앙에서 전체 시스템에 대한 정보를 취득하여 운영에 대한 의사결정을 독점하는 구조였다면 제안하는 원리는 마이크로그리드의 구성요소가 각각 지능형 에이전트를 기반으로 스스로 데이터를 취득하고 이웃 에이전트와의 대화와 협조를 통해 분산제어를 수행하는 방식이다. 각 에이전트 사이는 근거리 무선통신 방식인 Zigbee를 이용하였고 마이크로그리드를 실시간으로 해석하기 위하여 MATLAB 기반의 실시간 시뮬레이터를 이용하였다. 실시간 마이크로그리드 시뮬레이션 모델과 에이전트 역할을 하는 마이크로 컨트롤러를 연계하여 Hardware-in-the-loop 기반의 데모시스템을 구축하였고 제안하는 원리에 대해 검증하였다.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.13 no.11
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• pp.2361-2366
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• 2009

Usually, it is possible for human administrator to control the facilities manually or automatically using sensors in order to manage the fixed electricity facilities. However, it is difficult to collect the status data of those facilities in the central management system. In this paper, we propose the electricity facility management system to collect the status of facilities using the Zigbee networks. the proposed system exploits the various types of sensors, such as motion, heat, optical, etc, to measure the states of the facilities.

• 한국정보통신설비학회:학술대회논문집
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• 2009.08a
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• pp.121-124
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• 2009

In this paper, the techniques and design focus of flexible gain coltrol of LAN(Low Noise Amplifier) using the TSMC 0.18um CMOS process. The design frequency set up a standard on 2.4GHz that is used in Zigbee system. The design concepts a basic Cascode LNA techniques and a swiching circuit consisted of 4 NMOS of load resistance, which convert the output impedenceby tuning on or off. The result show the gain change by NMOS operated swich. The simulation result is that Gain is 14.07dB-16.79dB and NF(Noise Figure) is 1.06dB-1.09dB.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2013.05a
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• pp.571-572
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• 2013

This paper proposes a scheme of situation information gathering on zigbee system. We consider the schoolzone environment for base environment to situation information gathering, and the transmitting signal configuration and the sending method are designed and proposed.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.11 no.2
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• pp.13-19
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• 2011

By using beam-projectors, we can easily configure a big image system. In the process of installing beam-projectors, however manual steps are essentially needed to perform a calibration such that distortions can be minimized. In order to automatically perform the correction of distortion, in this paper we propose a new auto-calibration method for beam-projector, which is based on Zigbee and can be easily implemented by simple hardware and software. In the proposed scheme, we recognize the required image project area by using Zigbee-based sensor module, and then we can obtain the best beam projection even in the case that the screen is badly twisted.

• The Journal of the Korea institute of electronic communication sciences
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• v.10 no.1
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• pp.73-80
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• 2015

The valve device is installed in hazardous areas, such as a chemical plant explosion has been sealed with fire protection device to prevent the risk of explosion. In this paper, due to the explosion-proof devices using external power the device can not be used in infrared sensors and Zigbee sensor valve device by measuring the open degree of valve opening and closing of the danger zone to check whether. Valve opening and closing operation log screen time, we propose a low-power operation monitoring system administrators to manage and control the plant. Develop power control relay board apply an improved algorithm to apply the asynchronous LPL power management. The plant monitoring system and explosion-proof valve opening and closing the valve system with the intelligent device designed and implemented and tested it.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• v.2
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• pp.541-546
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• 2006

Zigbee를 이용한 실내 위치 측정 기법에서는 수신신호세기(RSSI) 측정치를 거리측정치로 활용하여 삼각측량법이나 DB 검색법을 이용하여 위치를 구한다. RSSI 측정치는 Zigbee 통신에서 기본적으로 제공하는 값으로 하드웨어 추가 없이 거리 측정에 사용할 수 있지만 정확도가 떨어진다. 이를 해결하기 위해 초음파 센서를 장착하고 RF와 초음파의 속도차이를 이용하여 정확한 거리를 측정할 수 있다. 이렇게 구해진 거리를 이용하면 정확한 위치를 구할 수 있다. 이를 구현하는 방법으로 본 논문에서는 고정된 위치의 비컨들이 순차적으로 신호를 전송하여 노드의 위치를 구하는 경우 발생하는 비컨의 전송 스케줄, 추가 및 동기 유지의 어려움을 해결할 수 있도록 노드에서 신호를 전송하고 비컨에서 구한 거리를 다시 노드로 Zigbee 통신을 이용하여 전달하여 위치를 구하는 기법을 제시하였다. 추가로 본 논문에서는 비컨 수의 제약으로 위치를 구할 수 없는 경우에 초음파 측정치에 추가하여 RSSI 측정치를 동시에 이용하는 위치측정기법을 제시하고, 실제 정적, 동적 실험을 통하여 그 유용성을 보였다. 3개 이상의 초음파 신호가 수신되는 경우 cm 급의 정확도로 위치를 10Hz 이상으로 구할 수 있었으며, 2개 이하의 초음파 신호가 수신되는 경우에도 RSSI 측정치가 있으면 수십 cm 급의 정확도로 위치를 구할 수 있음을 확인하였다.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.10 no.4
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• pp.17-22
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• 2010

As the services of ubiquitous environment has become accessible everywhere, it has been developed in various fields. Additionally interests in the u-Healthcare has sharply increased. In this paper, the BAN (Body Area Network) has been applied through ECG sensor and Zigbee communication of the existing ubiquitous sensor network environment to measure one's vital signs. The measured vital signs were then implemented in a system that enabled doctors and specialists to monitor by using 3G(WCDMA) communication. Furthermore, a location search device has been designed using the Smartphone's GPS modules to locate patients in the case of an emergency. The data field definition and designed system was based on the Smartphone's iPhone platform which has been in the spotlight for the previous months.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.13 no.6
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• pp.269-274
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• 2013

In this paper, we propose the design and implementation method of picking system using zigbee wireless communication in order to solve problems of the conventional picking system which has expensive labors and maintenance costs. We use multi router based star-tree topology as a default routing topology to provide the reliable data transmission and define the method of ID configuration and data transmission. We confirm that successful data transmission ratio of multi router based picking system is maximum 20% higher than that of single router based picking system.