• Title, Summary, Keyword: Sensor Node

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Sensor Node Design based on State Transition Model (상태천이모델 기반의 센서 노드 설계)

  • Shin, DongHyun;Kim, Changhwa
    • Journal of Korea Multimedia Society
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    • v.20 no.8
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    • pp.1357-1368
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    • 2017
  • Sensor networks are used in various fields such as marine, defense, and smart home etc. Among the components of the sensor network, the sensor node collects sensor data, as one of the representative sensor network roles, and the sensor node makes a greate influence on the overall performance of the sensor network. Therefore, how to design the sensor node is an important issue in the sensor network field. However, the research on the sensor network architecture suitable for the sensor network installation environment has been made more important than the research on how to configure the sensor node. In this paper, we propose to identify elements to be considered for designing a sensor node that makes a large influence on the performance of the sensor network, and to easily implement the sensor node through the state transition model based on these elements.

Design and fabrication of IEEE-802.15.4 protocol based universal sensor node platform with good extensity (확장성이 고려된 IEEE-802.15.4 기반의 저전력 범용 센서노드 설계 및 제작)

  • Chung, Wan-Young;Shin, Kwang-Sig;Jang, Sung-Gyun
    • Journal of Sensor Science and Technology
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    • v.16 no.4
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    • pp.247-253
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    • 2007
  • Low power consumption sensor network platform (sensor node) for sensor networking with IEEE 802.15.4 protocol was fabricated. The sensor node used ceramic bar type antenna for increasing RF signal performance and decreasing PCB size occupied by antenna. The communication range of the fabricated sensor node was about $20{\sim}30$ m in open environment with 915 MHz frequency bandwidth and well supported by Tiny OS. The sensor node have good connectivity with various external devices by RS-232, I2C, analogue and digital expansion board, hence, this sensor node can be applied to various applications in wireless sensor network and ubiquitous sensor network.

Design of the Node Decision Scheme for Processing Queries on Sensor Network Environments (센서 네트워크 환경에서 질의 처리를 위한 노드 선정 기법의 설계)

  • Kim, Dong Hyun
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.16 no.10
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    • pp.2224-2229
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    • 2012
  • Since sensor data are inserted into a data set continuously, continuous queries should be evaluated for searching data. To processing the continuous queries, it is required to build a query index on each sensor node and to transmit result data appropriate for query predicates. However, if query predicates are transferred to all sensor nodes, massive messages are required. In this paper, we propose the node decision scheme using the sensor node decision tree in order to diminish messages. The entry of a leaf node in the node decision tree represents a sensor node and defines the data region of the sensor node. When a user query is issued, sensor nodes are decided by intersecting between data regions of the tree with the query predicates of the user query, and then the query predicates are transmitted to the selected sensor nodes. We also implement the proposed sensor node decision tree and evaluate the experiments for the tree.

Performance Analysis of Scanning Scheme Using ToF for the Localization of Optics-Based Sensor Node (광신호 기반 무선 센서 노드 위치 인식을 위한 ToF 기법의 성능 분석)

  • Jang, Woo Hyeop;Park, Chan Gook
    • Journal of Institute of Control, Robotics and Systems
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    • v.19 no.3
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    • pp.268-274
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    • 2013
  • In this paper, the performance analysis of optics-based sensor node localization using ToF (Time of Flight) scheme is conducted. Generally, the position of the sensor node is calculated on the base station. And the base station scans neighboring sensor nodes with a laser. The laser which is reflected from one sensor node, however, can be reached to the base station at different angles according to the scanning resolution. This means that the error of the reached angle can increase and one node may be recognized as different nodes. Also the power of laser can decrease because the laser signal spread. Thus the sensor node which is located at a long distance from the base station cannot be detected. In order to overcome these problems which can be occurred in localization using ToF, the beam spot, the scanning resolution, the size of reflector and the power of laser at the sensor node were analyzed. It can be expected that the consequence of analysis can be provided in acquisition of accurate position of sensor node and construction of optics-based sensor node localization system.

Sensor Node Control Algorithm Based on TinyOS (TinyOS 기반의 센서 노드 제어 알고리즘)

  • Boo, Jun-Pil;Yang, Hyeon-Gyu;Kim, Do-Hyeon
    • The Journal of The Institute of Internet, Broadcasting and Communication
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    • v.8 no.4
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    • pp.1-8
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    • 2008
  • Recently, there is developing various ubiquitous application services using sensor networks based on TinyOS represented the operating system of sensor node. These sensor networks perform the collection and the transmission of sensing data from sensor node to get the context information. In this paper, we proposes the sensor node control algorithm which converts a sensor node to sleep, active, power off mode according to monitoring result of the voltage state of sensor node. Also, we designs and implement the sensor control module on server, sink, sensor node of sensor networks using this algorithm. It designs a sensor voltage control module of sensor node, data receive and display module of USN server using a java language and TinyOS. And, it checks the voltage state of sensor node, and it changes one of the sleep or power off modes in case of high voltage loss. Accordingly, we effectively use the power of sensor nodes as changing control modes of sensor nodes.

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Energy-aware deploy method for mobile sensors in hybrid sensor network (하이브리드 센서 네트워크에서 에너지 효율적인 모바일 센서 배치)

  • Kim, Yon-Jun;Peter, Hoh
    • Proceedings of the Korean Information Science Society Conference
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    • pp.791-795
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    • 2006
  • 하이브리드 센서 네트워크에서 static sensor node들이 초기 배치된 후, coverage-hole을 결정하여, hole을 커버할 mobile sensor node들의 필요한 수 및 위치를 결정하고 배치하는 연구는 상당한 수준에 이르렀다. 그러나 mobile sensor node들을 호출하고 배치하는데 너무 많은 에너지를 소모하고 있다. 본 논문에서는 coverage-hole에서 mobile sensor node들을 호출하기 전에 mobile sensor node들을 최대한 coverage-hole에 가깝게 배치하여, 호출하는데 소요되는 에너지를 획기적으로 절감하였다.

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Availability Analysis of Single Sensor Node using Hierarchical Model (계층적 모델을 이용한 단일 센서 노드의 가용성 분석)

  • Yoon, Young Hyun
    • Journal of the Korea Society of Digital Industry and Information Management
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    • v.5 no.2
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    • pp.87-93
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    • 2009
  • In this paper, we propose and evaluate the availability of single sensor node using a hierarchial modeling approach. We divides a sensor node into a software and hardware and analyze failures of each component. We construct Markov chains to represent the components of a sensor node, and then we construct a hierarchical model which use fault tree in upper level and Markov chains in lower level. We evaluate the availability and down of single sensor node.

Dual Sink Nodes for Sink Node Failure in Wireless Sensor Networks (무선 센서 네트워크에서의 싱크노드 실패에 대비한 이중 싱크노드 장치)

  • Kim, Dae-Il;Park, Lae-Jeong;Park, Sung-Wook;Lee, Hyung-Bong;Moon, Jung-Ho;Chung, Tae-Yun
    • IEMEK Journal of Embedded Systems and Applications
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    • v.6 no.6
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    • pp.369-376
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    • 2011
  • Since wireless sensor networks generally have the capability of network recovery, malfunction of a few sensor nodes in a sensor network does not cause a crucial problem paralyzing the sensor network. The malfunction of the sink node, however, is critical. If the sink node of a sensor network stops working, the data collected by sensor nodes cannot be delivered to the gateway because no other sensor nodes can take the place of the sink node. This paper proposes a TDMA-based wireless sensor network equipped with dual sink nodes, with a view to preventing data loss in the case of malfunction of a sink node. A secondary sink node, which synchronizes with a primary sink node and receives data from other sensor nodes in normal situations, takes the role of the primary sink node in the case of malfunction of the primary sink, thereby eliminating the possibility of data loss. The effectiveness of the proposed scheme is demonstrated through experiments.

Adjacent Matrix-based Hole Coverage Discovery Technique for Sensor Networks

  • Wu, Mary
    • Journal of the Korea Society of Computer and Information
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    • v.24 no.4
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    • pp.169-176
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    • 2019
  • Wireless sensor networks are used to monitor and control areas in a variety of military and civilian areas such as battlefield surveillance, intrusion detection, disaster recovery, biological detection, and environmental monitoring. Since the sensor nodes are randomly placed in the area of interest, separation of the sensor network area may occur due to environmental obstacles or a sensor may not exist in some areas. Also, in the situation where the sensor node is placed in a non-relocatable place, some node may exhaust energy or physical hole of the sensor node may cause coverage hole. Coverage holes can affect the performance of the entire sensor network, such as reducing data reliability, changing network topologies, disconnecting data links, and degrading transmission load. It is possible to solve the problem that occurs in the coverage hole by finding a coverage hole in the sensor network and further arranging a new sensor node in the detected coverage hole. The existing coverage hole detection technique is based on the location of the sensor node, but it is inefficient to mount the GPS on the sensor node having limited resources, and performing other location information processing causes a lot of message transmission overhead. In this paper, we propose an Adjacent Matrix-based Hole Coverage Discovery(AMHCD) scheme based on connectivity of neighboring nodes. The method searches for whether the connectivity of the neighboring nodes constitutes a closed shape based on the adjacent matrix, and determines whether the node is an internal node or a boundary node. Therefore, the message overhead for the location information strokes does not occur and can be applied irrespective of the position information error.

The Proposal and Implementation of Wireless Smart Sensor Node and NCAP System based on the IEEE 1451 (IEEE 1451 기반의 Wireless Smart Sensor Node와 NCAP 시스템의 제안과 구현)

  • Heo, Jung-Il;Lim, Su-Young;Seo, Jung-Ho;Kim, Woo-Shik
    • Journal of the Institute of Electronics Engineers of Korea CI
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    • v.44 no.5
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    • pp.28-37
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    • 2007
  • IEEE 1451 standard defines an interface for network and transducer. In this paper, We propose an architectural model to configure data acquisition system and wireless smart sensor node based on IEEE 1451 standard. Proposed Network Capable Application Processor(NCAP) supports the task of data acquisition and communication for smart sensor node and network. The NCAP is able to reconfigure without interrupting the functionality of the wireless sensor node and receives the critical information of transducer using the DB. Smart sensor node is able to provide the basic information of sensor in digital format. This digital format is called Transducer Electronic Data Sheet(TEDS), is capable of plug-and-play capability of wireless sensor node and the NCAP. We simplify the format of TEDS and template to apply to wireless network environment. information of TEDS and template is transmitted using ad-hoc routing. This study system uses body temperature sensor and ECG(Electrocardiogram) sensor to provide the medical information service. The format of template is selected by data sheet of the sensor and reconfigured to accurately describe the property of the sensor. DB of NCAP is possible to register new template and information of the property as developing new sensor.