• 제어로봇시스템학회논문지
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• 제13권9호
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• pp.920-926
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• 2007

Establishing a fixed path for the message delivery through a wireless network is impossible due to the mobility. Among the number of routing protocols that have been proposed for wireless ad-hoc networks, the AODV(Ad-hoc On-demand Distance Vector) algorithm is suitable in the case of highly dynamic topology changes, along with ZigBee Routing(ZBR), with the exception of route maintenance. Accordingly, this paper introduces a routing scheme focusing on the energy efficiency and route discovery time for wireless alarm systems using IEEE 802.15.4-based ZigBee. Essentially, the proposed routing algorithm utilizes a cluster structure and applies ZBR within a cluster and DSR (Dynamic Source Routing) between clusters. The proposed algorithm does not require a routing table for the cluster heads, as the inter-cluster routing is performed using DSR. The performance of the proposed algorithm is evaluated and compared with ZBR using an NS2 simulator. The results confirm that the proposed Cluster-based AODV (CAODV) algorithm is more efficient than ZBR in terms of the route discovery time and energy consumption.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1999년도 하계학술대회 논문집 G
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• pp.3064-3066
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• 1999

The existing equipment with wire communication can expect the stability of data transmission. However, according to increasing a number of DTE (Data Terminal Equipment), wiring work becomes a heavy burden. Restriction to application about portable DTE and the lack of flexibility are another drawback of wire communication. This paper presents the design and implementation of a RF (Radio Frequency) based wireless communication system. The RF based module is designed to the multi communication between DTEs. The RF based module consists of RF circuit and microprocessor. The main properties of RF circuit are maximum 5Kbps transmission rate, maximum 90m transmission distance and 433MHz frequency band. The microprocessor rearrange the data into AHDLC(Advanced High level Data Link Control) format and then instructs RF circuits to transmit/receive the data. The RF module have a wide application field such as fire/security alarm, remote control/measurement etc..

• 전기학회논문지P
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• 제58권4호
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• pp.377-384
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• 2009

In this paper, leakage current sensing module of SoC(System on Chip)type and real time monitoring system under consideration of electromagnetic interface in power trunk line are developed. The first, leakage current sensing module of SoC type under consideration of electromagnetic interface is developed, and the developed sensing module of SoC type is composed of leakage sensing part, power supply part, interface part, communication part, AD(Alternating current to Direct current)convert part and amplification part. And also the electromagnetic compatibility is evaluated by conduction and radiation of EMI(Electromagnetic Interference) for developed sensing module. The developed system can have confidence, stability and do energy saving under mixed electric circumstance of the low voltage communication device and high voltage equipment. The second, the real time remote monitoring system is developed using designed wire and wireless communication module with leakage current sensing module of SoC type. The developed real time remote monitoring system can monitor sensing state, occurrence state of leakage current and alarm for each step etc.. And the device configuration, PCB layout for leakage current sensing module of system on chip type and the experiment configuration in consideration of EMI are presented. Also the measurement results of conduction and radiation for EMI are presented.

• 전기전자학회논문지
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• 제26권3호
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• pp.510-514
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• 2022

본 논문에서는 고감도 보급형 방사선 측정센서 모듈 개발을 제안한다. 제안하는 측정센서 모듈은 섬광체+광증배소자(SiPM) 센서 최적화 구조설계, 센서 드라이버용 증폭과 필터 및 제어회로 설계, 근거리 통신을 포함한 제어회로 설계, 센서 기구설계 및 제작, 시제품에 적용되는 GUI 개발 등으로 구성된다. 섬광체+광증배소자(SiPM) 센서 최적화 구조 설계는 센서 구조 설계를 위한 섬광체와 광증배소자(SiPM)의 특성을 확인하여 설계한다. 센서 드라이버용 증폭과 필터 및 제어회로 설계는 SiPM을 이용하여 섬광체로 방사선에 의해 발생하는 미세 섬광신호를 처리하도록 설계한다. 근거리 통신을 포함한 제어회로 설계는 근거리 무선통신 기능을 지원하기 위한 MCU 설계 및 유선 통신 지원을 통해 데이터 전송이 가능하도록 설계를 수행한다. 센서 기구설계 및 제작은 플라스틱 섬광체에서 발생한 미세 섬광 신호를 광증배소자(SiPM)에 전달하기 위해 플라스틱 섬광체 외부에 반사지(미러링)를 감싸 발생한 섬광이 반사되어 효율을 높이도록 설계한다. 시제품에 적용되는 GUI 개발은 각 화면에 따라 상단에 날짜와 시간을 표현하며, 측정단위 및 시간, 초, 알람 레벨, 통신상태, 배터리 용량 등이 표현되도록 한다. 제안된 시스템의 성능을 평가하기 위하여 공인시험기관에서 실험한 결과는 방사선량 측정 범위가 30𝜇Sv/h ~ 10mSv/h로 측정되어서, 현재 국내외에서 상용으로 판매되는 제품들 중에서 최고수준 범위와 같은 결과가 산출되었다. 또한, ±7.4%의 측정 불확도가 측정되어서 국제 표준인 ±15% 이하에서 정상동작 됨이 확인되었다