• Title/Summary/Keyword: Distributed sensor

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Recent Advances in Structural Health Monitoring

  • Feng, Maria Q.
    • Journal of the Korean Society for Nondestructive Testing
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    • v.27 no.6
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    • pp.483-500
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    • 2007
  • Emerging sensor-based structural health monitoring (SHM) technology can play an important role in inspecting and securing the safety of aging civil infrastructure, a worldwide problem. However, implementation of SHM in civil infrastructure faces a significant challenge due to the lack of suitable sensors and reliable methods for interpreting sensor data. This paper reviews recent efforts and advances made in addressing this challenge, with example sensor hardware and software developed in the author's research center. It is proposed to integrate real-time continuous monitoring using on structure sensors for global structural integrity evaluation with targeted NDE inspection for local damage assessment.

Design an Indexing Structure System Based on Apache Hadoop in Wireless Sensor Network

  • Keo, Kongkea;Chung, Yeongjee
    • Proceedings of the Korea Information Processing Society Conference
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    • 2013.05a
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    • pp.45-48
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    • 2013
  • In this paper, we proposed an Indexing Structure System (ISS) based on Apache Hadoop in Wireless Sensor Network (WSN). Nowadays sensors data continuously keep growing that need to control. Data constantly update in order to provide the newest information to users. While data keep growing, data retrieving and storing are face some challenges. So by using the ISS, we can maximize processing quality and minimize data retrieving time. In order to design ISS, Indexing Types have to be defined depend on each sensor type. After identifying, each sensor goes through the Indexing Structure Processing (ISP) in order to be indexed. After ISP, indexed data are streaming and storing in Hadoop Distributed File System (HDFS) across a number of separate machines. Indexed data are split and run by MapReduce tasks. Data are sorted and grouped depend on sensor data object categories. Thus, while users send the requests, all the queries will be filter from sensor data object and managing the task by MapReduce processing framework.

Smart Sensor Management System Supporting Service Plug-In in MQTT-Based IIoT Applications

  • Lee, Young-Ran;Kim, Sung-Ki
    • Journal of Multimedia Information System
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    • v.9 no.3
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    • pp.209-218
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    • 2022
  • Industrial IoT applications, including smart factories, require two problem-solving to build data monitoring systems required by services from distributed IoT sensors (smart sensors). One is to overcome proprietary protocols, data formats, and hardware differences and to uniquely identify and connect IoT sensors, and the other is to overcome the problem of changing the server-side data storage structure and sensor data transmission format according to the addition or change of service or IoT sensors. The IEEE 1451.4 standard-based or IPMI specification-based smart sensor technology supports the development of plug-and-play sensors that solve the first problem. However, there is a lack of research that requires a second problem-solving, which requires support for the plug-in of IoT sensors into remote services. To propose a solution for the integration of these two problem-solving, we present a IoT sensor platform, a service system architecture, and a service plugin protocol for the MQTT-based IIoT application environment.

Optical Fiber-Based Hybrid Nerve Measurement System for Static and Dynamic Behavior of Structures (구조물의 정적 및 동적 거동 모니터링을 위한 광섬유 기반 하이브리드 신경망 계측 시스템)

  • Park, Young-Soo;Song, Kwang-Yong;Jin, Seung-Seop;Park, Young-Hwan;Kim, Sung-Tae
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.24 no.2
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    • pp.33-40
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    • 2020
  • Various studies have been conducted on the structural health monitoring using optical fiber. Optical fibers can be used to measure multiple and distributed strain. Among the optical fiber sensors, FBG sensor has advantages of dynamic response measurement and high precision, but the number of measurement points is limited. Distributed fiber sensors, represented by distributed Brillouin sensors, usually have more than 1000 measurement points, but the low sampling rate makes dynamic measurements impossible. In this study, a hybrid nerve sensor system using only the advantages of the FBG sensor and the distributed Brillouin sensor has been proposed. Laboratory experiments were performed to verify the proposed system, and the accuracy and reproducibility were verified by comparing with commercial sensors. Applying the proposed system, dynamic response ambient measurements are used to evaluate the global state of the structure. When an abnormal condition is detected, the local condition of the structure is evaluated by static response measurement using the distributed measurement system. The proposed system can be used for efficient structural health monitoring.

A Study of Energy Efficient Clustering in Wireless Sensor Networks (무선 센서네트워크의 에너지 효율적 집단화에 관한 연구)

  • Lee Sang Hak;Chung Tae Choong
    • The KIPS Transactions:PartC
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    • v.11C no.7 s.96
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    • pp.923-930
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    • 2004
  • Wireless sensor networks is a core technology of ubiquitous computing which enables the network to aware the different kind of context by integrating exiting wired/wireless infranet with various sensor devices and connecting collected environmental data with applications. However it needs an energy-efficient approach in network layer to maintain the dynamic ad hoc network and to maximize the network lifetime by using energy constrained node. Cluster-based data aggregation and routing are energy-efficient solution judging from architecture of sensor networks and characteristics of data. In this paper. we propose a new distributed clustering algorithm in using distance from the sink. This algorithm shows that it can balance energy dissipation among nodes while minimizing the overhead. We verify that our clustering is more en-ergy-efficient and thus prolongs the network lifetime in comparing our proposed clustering to existing probabilistic clustering for sensor network via simulation.

Research Directions for Efficient Query Processing over Sensor Data Streams (센서 데이터 스트림 환경에서 효율적인 질의처리 연구방향)

  • An, Dong-Chan
    • KSCI Review
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    • v.14 no.2
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    • pp.199-204
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    • 2006
  • The sensor network is a wireless network of the sensor nodes which sensing, computation and communication ability. Each sensor nodes create the data items by sensor nodes above one. Like this feature, the sensor network is similar to distributed data base system. The sensor node of the sensor network is restricted from the power and the memory resources is the biggest weak point and is becoming the important research object. In this paper, We try to see efficient sensor data stream management method and efficient query processing method under the restricted sensor network environment.

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Research on Distributed Sensor Device Resource Object Collaboration Service Providing System based on Service Delivery Platform (서비스 전달 플랫폼 기반 분산 센서 디바이스 자원 객체 연동 서비스 제공 시스템 연구)

  • Yoon, Changwoo
    • Journal of the Institute of Electronics and Information Engineers
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    • v.52 no.6
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    • pp.144-150
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    • 2015
  • A system for providing a distributed device resource-object-connection service based on a service delivery platform (SDP) is described. The system includes an SDP and proxy. The SDP configures to define distributed service functions as enablers, generates a convergence service by combining the enablers, and provides the generated convergence service. The proxy configures to connect a distributed device and an SDP to allow the SDP to use the distributed device as a resource, and define and use the distributed device as an enabler. The system are capable of defining distributed service functions as well as distributed sensors as enablers, and thereby allowing the distributed sensors to be used in the same sense as service-function enablers.

Operational Concept and Procedure for Land Navigation of Distributed Missile System (분산유도무기체계의 지상항법 운용 개념 및 절차 연구)

  • Ryu, Moo-Yong
    • Journal of the Korea Institute of Military Science and Technology
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    • v.11 no.2
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    • pp.66-72
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    • 2008
  • A distributed missile system is composed of command control center, radar and launcher which exchange information each other to use wire or wireless network. The distributed missile system is required mobility for operational convenience and survivability. Also missile system requests land navigation system to provide relatively accurate attitude. For reason of these requirements, each subsystem needs land navigation which provides information of position and attitude. This paper represents operational concept for land navigation to consider operational environment and concrete operational procedure to apply the operational concept. In state that there is no operation for land navigation of distributed missile system internally so for, this paper could be helped to establish operational concept and procedure of this kind of system.

Network Type Distributed Control System with Considering Data Collision (데이터 충돌을 고려한 네트워크형 분산 제어 시스템)

  • Choi, Goon-Ho
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.29 no.1
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    • pp.113-120
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    • 2015
  • Network type distributed control system uses a communication line which is named the BUS to exchange a data among the sub-systems. Usually, on the bus, only one data must be exited at one time, so the control algorithm to prevent collision or to manage a priority of data is important. Including CAN Protocol, many kind of FieldBus which are used for distributed control system, prevent data collision by controlling transmission time. But, a system which have to make a control signal or get a data from a sensor at fixed time will be met a problem when it is composed by using a network type distributed control structure. In this paper, some of these cases will be discussed and solutions be proposed for preventing a data collision. Also, using Arago Disk System which have a structure for inner loop control, the validity of the proposed methods will be verified.

DESIGN AND IMPLEMENTATION OF METADATA MODEL FOR SENSOR DATA STREAM

  • Lee, Yang-Koo;Jung, Young-Jin;Ryu, Keun-Ho;Kim, Kwang-Deuk
    • Proceedings of the KSRS Conference
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    • v.2
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    • pp.768-771
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    • 2006
  • In WSN(Wireless Sensor Network) environment, a large amount of sensors, which are small and heterogeneous, generates data stream successively in physical space. These sensors are composed of measured data and metadata. Metadata includes various features such as location, sampling time, measurement unit, and their types. Until now, wireless sensors have been managed with individual specification, not the explicit standardization of metadata, so it is difficult to collect and communicate between heterogeneous sensors. To solve this problem, OGC(Open Geospatial Consortium) has proposed a SensorML(Sensor Model Language) which can manage metadata of heterogeneous sensors with unique format. In this paper, we introduce a metadata model using SensorML specification to manage various sensors, which are distributed in a wide scope. In addition, we implement the metadata management module applied to the sensor data stream management system. We provide many functions, namely generating metadata file, registering and storing them according to definition of SensorML.

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