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  • 1.
    Danielsson, Per-Erik
    et al.
    Linköping University, Department of Electrical Engineering, Computer Vision. Linköping University, The Institute of Technology.
    Lin, Qingfen
    Linköping University, Department of Electrical Engineering, Computer Vision. Linköping University, The Institute of Technology.
    Ye, Qin-Zhong
    Linköping University, Department of Science and Technology. Linköping University, The Institute of Technology.
    Efficient detection of second-degree variations in 2D and 3D images2001In: Journal of Visual Communication and Image Representation, ISSN 1047-3203, E-ISSN 1095-9076, Vol. 12, no 3, p. 255-305Article in journal (Refereed)
    Abstract [en]

    Estimation of local second-degree variation should be a natural first step in computerized image analysis, just as it seems to be in human vision. A prevailing obstacle is that the second derivatives entangle the three features signal strength (i.e. magnitude or energy), orientation and shape. To disentangle these features we propose a technique where the orientation of an arbitrary pattern f is identified with the rotation required to align the pattern with its prototype p. This is more strictly formulated as solving the derotating equation. The set of all possible prototypes spans the shape-space of second degree variation. This space is one-dimensional for 2Dimages, two-dimensional for 3D-images. The derotation decreases the original dimensionality of the response vector from three to two in the 2D-case and from six to three in the 3D-case, in both cases leaving room only for magnitude and shape in the prototype. The solution to the derotation and a full understanding of the result requires i) mapping the derivatives of the pattern f onto the orthonormal basis of spherical harmonics, and ii) identifying the eigenvalues of the Hessian with the derivatives of the prototype p. But once the shape-space is established the possibilities to put together independent discriminators for magnitude, orientation, and shape are easy and almost limitless.

  • 2.
    Huynh, Allan
    et al.
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Zhang, Jingcheng
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Ye, Qin-Zhong
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Gong, Shaofang
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Wireless Remote Monitoring System for Cultural Heritage2010In: Sensors & Transducers Journal, ISSN 1726-5479, Vol. 118, no 7, p. 1-12Article in journal (Refereed)
    Abstract [en]

    Existing systems to collect temperature and relative humidity data at cultural heritage buildings require technical knowledge by people who are working with it, which is very seldom that they do have. The systems available today also require manual downloading of the collected data from the sensor to a computer for central storage and for further analysis. In this paper a wireless remote sensor network based on the ZigBee technology together with a simplified data collection system is presented. The system does not require any knowledge by the building administrator after the network is deployed. The wireless sensor device will automatically join available network when the user wants to expand the network. The collected data will be automatically and periodically synchronized to a remote main server via an Internet connection. The data can be used for centralized monitoring and other purpose. The power consumption of the sensor module is also minimized and the battery lifetime is estimated up to 10 years.

  • 3.
    Huynh, Allan
    et al.
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Zhang, Jingcheng
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Ye, Qin-Zhong
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Gong, Shaofang
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    ZigBee Radio with External Low-Noise Amplifier2010In: Sensors & Transducers Journal, ISSN 1726-5479, Vol. 114, no 3, p. 184-191Article in journal (Refereed)
    Abstract [en]

    This article presents the performance study of a ZigBee module with an external low-noiseamplifier, measured in both outdoor and indoor environments. Our previous study has already shownthat the indoor campus environment such as walls and floors would reduce the radio link rangedrastically and the packet error rate increased. In this study, an external low-noise amplifier has beenadded to a ZigBee module to increase the receiver sensitivity. It is shown that with an external lownoiseamplifier the outdoor radio range can reach up to 403 m with a negligible packet error ratecompared to 144 m without the low-noise amplifier for point-to-point connection. Thus, by increasingthe receiver sensitivity the radio range can be increased without increasing of the radio power outputso that the power consumption can still be kept low to obtain long battery lifetime.

  • 4.
    Huynh, Allan
    et al.
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Zhang, Jingcheng
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Ye, Qin-Zhong
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Gong, Shaofang
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    ZigBee Radio with External Power Amplifier and Low-Noise Amplifier2010In: Sensors & Transducers Journal, ISSN 1726-5479, Vol. 118, no 7, p. 110-121Article in journal (Refereed)
    Abstract [en]

    This paper presents the performance study of a ZigBee module with both an external power amplifier and a low-noise amplifier, measured in outdoor and indoor environments, respectively. Our previous study has already shown that the indoor campus environment such as walls and floors would reduce the radio link range drastically and the packet error rate increased. In this study, both an external power amplifier and a low-noise amplifier have been added to a ZigBee module to increase both the transmitter power and receiver sensitivity. It is shown that with an external power amplifier and a low-noise amplifier the outdoor radio range can reach up to 1600 m with a negligible packet error rate compared to 144 m without any external amplifier for point-to-point radio connection. Thus, by increasing both the transmitter power and receiver sensitivity the radio range can be increased significantly. The power consumption issue with the added amplifiers is studied as well, indicating that the module can still be battery driven with a battery lifetime of about 9 years at a normal sampling rate to the sensor.

  • 5.
    Serban (Craciunescu), Adriana
    et al.
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, Faculty of Science & Engineering.
    Morales, Oscar
    Linköping University, Department of Science and Technology. Linköping University, Faculty of Science & Engineering.
    Petersson, Tobias
    Linköping University, Department of Science and Technology. Linköping University, Faculty of Science & Engineering.
    Kalvér, Henrik
    Linköping University, Department of Science and Technology. Linköping University, Faculty of Science & Engineering.
    Ye, Qin-Zhong
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, Faculty of Science & Engineering.
    Multi-Port Front-End and DSP Co-Design for Vital Signs Detector2018Conference paper (Refereed)
    Abstract [en]

    Controlled wave interferometry within the passive multi-port (six-port) correlator with capability to accurately process phase information is shown to be a useful technique for microwave radar and wireless sensor applications. In this paper, the co-design and implementation of a complete hardware-software Doppler radar modular system for vital signs detection using the multi-port technology is presented. In contrast to multi-port radio applications, the challenge is to demonstrate the possibility to detect weak, Hz-range frequency signals.

  • 6.
    Zhang, Jingcheng
    et al.
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Huynh, Allan
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Huss, Patrik
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Ye, Qin-zhong
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Gong, Shaofang
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    A Web-based Remote Indoor Climate Control System Based on Wireless Sensor Network2013In: International Journal of Sensors and Sensor Networks, ISSN 2329-1796, Vol. 1, no 3, p. 32-40Article in journal (Refereed)
    Abstract [en]

    This paper presents the design and implementation of a web-based wireless indoor climate control system. The user interface of the system is implemented as a web service. People can login to the website and remotely control the indoor climate of different locations. A wireless sensor network is deployed in each location to execute control commands. A gateway is implemented to synchronize the information between the wireless sensor network and the web service. The gateway software also includes scheduling function and different control algorithms to improve the control result. Additionally, the system security and availability are highly considered in this system. The gateway software implements a warning function which sends warning messages when emergency happens. Finally, the whole wireless control system architecture is modularly designed. It is easy to add different control applications or different control algorithms into the system.

  • 7.
    Zhang, Jingcheng
    et al.
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Huynh, Allan
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Ye, Qin-zhong
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Gong, Shaofang
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    A Communication Reliability Enhancement Framework for Wireless Sensor Network Using the ZigBee Protocol2011In: Sensors & Transducers Journal, ISSN 2306-8515, E-ISSN 1726-5479, Vol. 135, no 12, p. 42-56Article in journal (Refereed)
    Abstract [en]

    This paper presents the methods for the ZigBee network reliability enhancement and the battery life time optimization. The paper begins with the introduction of the common communication problems due to the broken links between sensor module and message relay, or between different relays. Extra message hand shake mechanisms are added to solve different problem mentioned at the beginning. Finally, a general purpose reliability enhancement component is developed as a state machine which can be work together with ZigBee protocol to enhance ZigBee network communication reliability. Moreover, the battery life time of the sensor module during link broken is considerably increased after the enhancement.

  • 8.
    Zhang, Jingcheng
    et al.
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Huynh, Allan
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Ye, Qin-Zhong
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Gong, Shaofang
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    A Fully Wireless Monitoring and Control System for Protecting Cultural Heritage2011In: Proceedings of 2011 20th IEEE International Workshops on Enabling Technologies: Infrastructure for Collaborative Enterprises WETICE 2011, IEEE , 2011, p. 250-255Conference paper (Refereed)
    Abstract [en]

    This paper presents a component based wireless monitoring and control system. The system is introduced from both the system architecture and function point of view. The paper begins with the introduction of the component design and the communication interaction between them. The system is composed by three components, the wireless sensor network, the local server and the main server. Wireless sensor networks are deployed in different locations for remote monitoring and control purpose. The monitoring results and control commands are synchronized between the main server and wireless sensor networks via local servers. The test results of the battery life time calculation and remote monitoring field test results are presented in the end of the paper.

  • 9.
    Zhang, Jingcheng
    et al.
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Huynh, Allan
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Ye, Qin-Zhong
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Gong, Shaofang
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Design of the Remote Climate Control System for Cultural Buildings Utilizing ZigBee Technology2010In: Sensors & Transducers Journal, ISSN 2306-8515, E-ISSN 1726-5479, Vol. 118, no 7, p. 13-27Article in journal (Refereed)
    Abstract [en]

    A wireless solution of remote climate control for cultural buildings is presented in this paper. The system allows users to use web service to control climate in different cultural buildings, like churches. The wireless sensor networks deployed in churches receive the control commands and manage the indoor climate. The whole system is modularly designed, which makes possible an easy service extension, system reconfiguration and modification. This paper includes the system overview and the software design of each part within the system.

  • 10.
    Zhang, Jingcheng
    et al.
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Huynh, Allan
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Ye, Qin-Zhong
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Gong, Shaofang
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Reliability and Latency Enhancements in a ZigBee Remote Sensing System2010Conference paper (Other academic)
    Abstract [en]

    Methods to improve the reliability and optimize the system latency of our own-developed ZigBee remote sensing system are introduced in this paper. The concept of this system utilizes the ZigBee network to transmit sensor information and process them at both local and remote databases. The enhancement has been done in different parts in this system. In the ZigBee network part, the network topology is configured and controlled. The latency for message transmitting is also optimized. In the data processing part, the network status check function and data buffer function are introduced to improve the system reliability. Additionally, the system latency is measured to compare with the Ad-hoc On Demand Distance Vector algorithm used in the ZigBee standard.

  • 11.
    Zhang, Jingcheng
    et al.
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Huynh, Allan
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Ye, Qin-Zhong
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Gong, Shaofang
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Remote Sensing System for Cultural Buildings Utilizing ZigBee Technology2010Conference paper (Refereed)
    Abstract [en]

    A wireless remote sensing system using the ZigBee standard ispresented in this paper. This system is a wireless solution formonitoring purpose in cultural buildings in order to protectcultural heritage. The concept of this system utilizes ZigBeenetworks to carry and transmit data collected by sensors andstore them into both local and remote databases. Thus, users canmonitor the measured data locally or remotely. Especially, thepower consumption is optimized to extend the lifetime of thebattery-driven devices. Moreover, since the system has amodular architecture, it is easy to add extra services into thissystem.

  • 12.
    Zhang, Jingcheng
    et al.
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Ye, Qin-zhong
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Huynh, Allan
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Gong, Shaofang
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Design and Implementation of a Truly Battery-Driven ZigBee Wireless Sensor Network2013Manuscript (preprint) (Other academic)
    Abstract [en]

    As defined by the ZigBee standard, a router should be mains-powered in order to maintain the mesh feature of the ZigBee network. This study presents a method which allows the ZigBee router goes into sleep mode periodically and keeps the same mesh feature during the ZigBee communications. In this study, the standard ZigBee communication is separated into two synchronized clusters. The first cluster includes the communication between end devices and the associated router. The sensor message report time of different end devices are scheduled by the router in different collision-free time slots within a predefined time interval. The second cluster includes the mesh communication between routers and the concentrator. All routers are synchronized so that they wake up at the same time to maintain the mesh feature. In order to maximize the router battery lifetime, algorithms are developed so that the concentrator communicates with routers according to the network routing records. Additionally, in order to recover the broken communication, special logics are implemented in routers and end device so that they can rejoin the wireless sensor network with low power consumption. Finally, a battery lifetime model is presented which can be utilized to calculate battery lifetime of the ZigBee router under different network configurations.

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