• Title/Summary/Keyword: multi-sensor

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Multi-Vehicle Environment Simulation Tool to Develop and Evaluate Automated Driving Systems in Motorway (고속도로에서의 자율주행 알고리즘 개발 및 평가를 위한 다차량 시뮬레이션 환경 개발)

  • Lee, Hojoon;Jeong, Yonghwan;Min, Kyongchan;Lee, Myungsu;Shin, Jae Kon;Yi, Kyongsu
    • Journal of Auto-vehicle Safety Association
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    • v.8 no.4
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    • pp.31-37
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    • 2016
  • Since real road experiments have many restrictions, a multi-vehicle traffic simulator can be an effective tool to develop and evaluate fully automated driving systems. This paper presents multi-vehicle environment simulation tool to develop and evaluate motorway automated driving systems. The proposed simulation tool consists of following two main parts: surrounding vehicle model and environment sensor model. The surrounding vehicle model is designed to quickly generate rational complex traffic situations of motorway. The environment sensor model depicts uncertainty of environment sensor. As a result, various traffic situations with uncertainty of environment sensor can be proposed by the multi-vehicle environment simulation tool. An application to automated driving system has been conducted. A lane changing algorithm is evaluated by performance indexes from the multi-vehicle environment simulation tool.

Development of Multi-function Sensor Integration Module System for Smart Green Building (스마트 그린빌딩 구현을 위한 다기능 센서 통합 모듈 시스템 개발)

  • Kim, Bong-Hyun
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.14 no.10
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    • pp.4799-4804
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    • 2013
  • Green IT technology for the growth of low-carbon green environment and future development of the new technology. Therefore, in this paper, data generated by the security module for RFID applications, smart green building Sung multi-function sensor integrated module that can be integrated environment for building monitoring and management system has been developed. The development of a thermal sensor, temperature sensor, smog sensor, CO2 sensor, O2 sensor, tension sensor and damage detection sensor module with integrated system module integrated multi-functional sensors implemented in the paper. In real-time monitoring by allowing was design and developed system that can be implemented smart green building environment for the environment inside buildings.

Wireless sensor network design for large-scale infrastructures health monitoring with optimal information-lifespan tradeoff

  • Xiao-Han, Hao;Sin-Chi, Kuok;Ka-Veng, Yuen
    • Smart Structures and Systems
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    • v.30 no.6
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    • pp.583-599
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    • 2022
  • In this paper, a multi-objective wireless sensor network configuration optimization method is proposed. The proposed method aims to determine the optimal information and lifespan wireless sensor network for structural health monitoring of large-scale infrastructures. In particular, cluster-based wireless sensor networks with multi-type of sensors are considered. To optimize the lifetime of the wireless sensor network, a cluster-based network optimization algorithm that optimizes the arrangement of cluster heads and base station is developed. On the other hand, based on the Bayesian inference, the uncertainty of the estimated parameters can be quantified. The coefficient of variance of the estimated parameters can be obtained, which is utilized as a holistic measure to evaluate the estimation accuracy of sensor configurations with multi-type of sensors. The proposed method provides the optimal wireless sensor network configuration that satisfies the required estimation accuracy with the longest lifetime. The proposed method is illustrated by designing the optimal wireless sensor network configuration of a cable-stayed bridge and a space truss.

Spatial Reservoir Temperature Monitoring using Thermal Line Sensor (다중온도센서를 통한 입체적인 호소 온도모니터링 평가)

  • Hwang, Ki-Sup;Park, Dong-Soon;Jung, Woo-Sung
    • Proceedings of the Korea Water Resources Association Conference
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    • 2006.05a
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    • pp.1002-1006
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    • 2006
  • Temperature monitoring techniques per depth have been recognized as important information in the reservoir environmental issues. However, old measurement method by single temperature sensor and cable type has demerits not only for its limited measuring location but for its inconvenience of users. In this study, multi-channel temperature monitoring system was introduced and executed experiment for actual application feasibility evaluation. Both type of new techniques such as multi-channel addressable built-in temperature sensor and fiber optic multi sensor were tested in Daechung and Imha reservoir. As a result, it was proved that these kinds of temperature monitoring skills had very good performance and availability for a output of spatial, simultaneous thermal distribution focused on the user's convenience. And these measuring method and thermal data will be useful for providing basic information in a water resources investigation like reservoir stratification and environmental problems.

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Adaptive Medium Access Control protocol for low-power wireless sensor network (저전력 무선 센서 네트워크를 위한 적응적 MAC 프로토콜)

  • Kang, Jeong-Hoon;Lee, Min-Goo;Yoon, Myung-Hyun;Yoo, Jun-Jae
    • Proceedings of the KIEE Conference
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    • 2005.05a
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    • pp.209-211
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    • 2005
  • This paper proposes a adaptive medium-access control(MAC) protocol designed for low-power wireless multi-hop sensor networks which is used for connecting physical world and cyber computing space. Wireless multi-hop sensor networks use battery-operated computing and sensing device. We expect sensor networks to be deployed in an ad hoc fashion, with nodes remaining inactive for long time, but becoming suddenly active when specific event is detected. These characteristics of multi-hop sensor networks and applications motivate a MAC that is different from traditional wireless MACs about power conservation scheme, such as IEEE 802.11. Proposed MAC uses a few techniques to reduce energy consumption. Result show that proposed MAC obtains more energy savings.

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DEVELOPMENT OF LASER VISION SENSOR WITH MULTI-LINE

  • Kieun Sung;Sehun Rhee;Yun, Jae-Ok
    • Proceedings of the KWS Conference
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    • 2002.10a
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    • pp.324-329
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    • 2002
  • Generally, the laser vision sensor makes it possible design a highly reliable and precise range sensor at a low cost. When the laser vision sensor is applied to lap joint welding, however, there are many limitations. Therefore, a specially-designed hardware system has to be used. However, if the multi-lines are used instead of a single line, multi-range data can be generated from one image. Even under a set condition of 30fps, the generated 2D range data increases depending on the number of lines used. In this study, a laser vision sensor with a multi-line pattern is

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Development of Laser Vision Sensor with Multi-line for High Speed Lap Joint Welding

  • Sung, K.;Rhee, S.
    • International Journal of Korean Welding Society
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    • v.2 no.2
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    • pp.57-60
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    • 2002
  • Generally, the laser vision sensor makes it possible design a highly reliable and precise range sensor at a low cost. When the laser vision sensor is applied to lap joint welding, however. there are many limitations. Therefore, a specially-designed hardware system has to be used. However, if the multi-lines are used instead of a single line, multi-range data .:an be generated from one image. Even under a set condition of 30fps, the generated 2D range data increases depending on the number of lines used. In this study, a laser vision sensor with a multi-line pattern is developed with conventional CCD camera to carry out high speed seam tracking in lap joint welding.

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Design of Multi-Sensor Data Fusion Filter for a Flight Test System (비행시험시스템용 다중센서 자료융합필터 설계)

  • Lee, Yong-Jae;Lee, Ja-Sung
    • The Transactions of the Korean Institute of Electrical Engineers D
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    • v.55 no.9
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    • pp.414-419
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    • 2006
  • This paper presents a design of a multi-sensor data fusion filter for a Flight Test System. The multi-sensor data consist of positional information of the target from radars and a telemetry system. The data fusion filter has a structure of a federated Kalman filter and is based on the Singer dynamic target model. It consists of dedicated local filter for each sensor, generally operating in parallel, plus a master fusion filter. A fault detection and correction algorithms are included in the local filter for treating bad measurements and sensor faults. The data fusion is carried out in the fusion filter by using maximum likelihood estimation algorithm. The performance of the designed fusion filter is verified by using both simulation data and real data.

Energy Efficient Clustering Scheme for Multi-sensor on Wireless Sensor Networks (무선 센서 네트워크의 다종 센서에 대한 에너지 효율적인 클러스터링 기법)

  • Choi, Dongmin;Chung, Ilyong
    • Journal of Korea Multimedia Society
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    • v.19 no.3
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    • pp.573-584
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    • 2016
  • Recent application range of sensor networks is becoming diverse. It means collected sensor data types are becoming diverse too. These sensor data have their own characteristics. Thus achieving energy efficiency, existing sensor network management policy consider their own characteristics. However, it is inefficient to apply the existing network management schemes for controlling such kind of data at the same time. Because, existing network management schemes considered one type of data only. Therefore, we propose a novel routing scheme that is able to efficient energy conservation through effective data controlling on multi-sensor application environment.

A Distance Estimation Algorithm Based on Multi-Code Ultrasonic Sensor and Received Signal Strength (다중 코드 초음파와 전파 신호 강도를 이용한 거리 측정)

  • Cho, Bong-Su;Kim, Phil-Soo;Moon, Woo-Sung;Baek, Kwang-Ryul
    • Journal of Institute of Control, Robotics and Systems
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    • v.17 no.2
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    • pp.149-156
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    • 2011
  • This paper reveals a distance estimation algorithm based on multi-code ultrasonic and wireless sensor network. For measuring the distances among the sensor nodes, each ultrasonic transmitter transmits multi-code ultrasonic signal simultaneously. Receivers use cross correlation method to separate the coded signals. The information of measured distances is broadcasted to each sensor node by wireless sensor network. The wireless sensor network measures the distance among the sensor nodes using the received signal strength of the broadcasting. The multi-code ultrasonic have a limitation of measurable distance. And the received signal strength is affected from an environment. This paper measures a distance using ultrasonic and a received signal strength in short range. These measured data are applied to the least square estimation algorithm. By the expansion of the fitting curve, a distance measurement in long range using the received signal strength is compensated. The coupled system reduce the error to an acceptable level.