Hai-ying Zhou

Harbin Institute of Technology, Harbin, Heilongjiang Sheng, China

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Publications (9)0 Total impact

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    ABSTRACT: In spite of the rapid development of medicine, cardiovascular diseases are still the number one killer in the world. In France every year more than 50,000 people die suddenly due cardiac arrhythmias. Identification of high risk sudden death patient is still a challenge. To detect the cardiac arrhythmias, currently Holter is generally used to record 1~3 leads ECG (electrocardiogram) signals during 24h to 72h. However the use of Holter is limited among the population due to its form factor (not user-friendly) and cost. In this paper, we propose an integrated single chip wearable Holter named SoC-Holter, which enables to record 1~4 leads ECG. This single chip SoC-Holter is relied on adequation algorithm architecture design methodology. To minimize energy consumption, CMOS technology (0.35µm) is used to prototype the first implementation and test. The SoC-Holter has the following functions: signal conditioner and preamplifier, amplifier and filters, analog to digital converter, and Nano-controller. The low-pass filter is composed of current division, degeneration and common-mode feedback circuits added to fulfill the required performance. The analog circuits are implemented, tested and validated. The digital bloc is simulated, implemented and tested. It seems that an integrated, low cost, and user-friendly single chip Holter is feasible. Consequently large number of high risk populations such as heavy smoker and obese may be monitored. This SoC-Holter consumes less than 10mW while the device is operating.
    JNW. 01/2011; 6.
  • Julien Mousset, Hai-ying Zhou, Kun-mean Hou
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    ABSTRACT: Wireless Sensor Networks (WSN) is a powerful technology that can be used in many application domains varying from geology surveillance to medicine healthcare. However, current protocols for WSN are not suitable to handle the WSN applications with high mobility of sensor nodes. In this paper, we present a protocol named CIVIC designed for Vehicular Ad-hoc Network. This protocol is based on one-hop broadcast and energy-aware routing mechanism dedicated to the high mobility WSN applications. The experiential simulation results show CIVIC has better performance comparing with those of other WSN routing protocols in view of its packet lost rate, data delay and energy consumption.
    01/2011;
  • Hai-ying Zhou, Kun-mean Hou
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    ABSTRACT: Heart diseases are the serious health threats to human beings. Traditional cardiac monitoring systems are unsatisfactory to prevent the sudden death events caused by heart diseases. A pervasive cardiac monitoring system is thus developed, which can provide a real-time continuous cardiac care and arrhythmias detection service for any person at any time in any place. This paper gives a detailed description about the architecture and operation fashion of this system. This system has been tested on more than 30 patients in a hospital and more than 10 sportsmen in a training field, and also compared with the HP telemetry system. Concerning the clinical off-line arrhythmia detection, this system has similar results with the HP telemetry, but concerning the outdoor on-line ambulatory arrhythmia detection, this system has better performance results. The evaluation results prove that this system meets the requirements of real-time cardiac monitoring and diagnosing applications.
    Bioinformatics and Biomedical Engineering (iCBBE), 2010 4th International Conference on; 07/2010
  • Hai-ying Zhou, Feng Wu, Kun-mean Hou
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    ABSTRACT: At present, the OSs (Operating system) employed for WSN (wireless sensor networks) are either satisfied with only one or two application classes or unsuitable for strict-constrained resources. In view of a variety of WSN applications, there is a need of developing a self-adaptable and self-configurable embedded real-time operating system (RTOS). This paper presents a resource-aware and low-power RTOS termed LIMOS. This kernel adopts a component-based three-level system architecture: action (system operation), thread (component) and event (container). In accordance, a predictable and deterministic two-level scheduling mechanism is proposed: 'non pre-emption priority based' high level scheduling for events and 'preemptive priority-based' low level scheduling for threads. Employing the concepts of LINDA language, LIMOS provides a simplified tuple space and a light IN/OUT system primitive-pair to achieve system communication and synchronization. LIMOS is capable of self-adapting to run on two operation modes: event-driven and multi-threading, with respect to the application diversity. The performance evaluation and comparison shows LIMOS has tiny resource consumption and is fit for the real-time applications. Currently LIMOS has been ported on several hardware platforms for different WSN applications.
    Embedded Software and Systems, 2008. ICESS '08. International Conference on; 08/2008
  • Hai-ying Zhou, Kun-mean Hou
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    ABSTRACT: Wireless sensor network presents a self-organizing, wireless, ad hoc communication network that trades lower data throughput and higher message latency for lower cost and lower power drain. Conventional wireless routing protocols generally cannot satisfy the particular requirements of WSN applications to build reliable and efficient communication links. CIVIC is a location-based hybrid routing protocol (proactive and reactive). This protocol is basing upon two mechanisms: FFCCC and DANKAB. The former provides a power-aware minimal distance competitive mechanism to select a best effective node for data forwarding. The latter adopts a directional area neighbor knowledge adaptive broadcast policy to constrain the number of transferring nodes. CIVIC is also a context-aware and security consideration protocol. Messages are classified into different security and priority levels according to data context. Furthermore, meta codebook technique is adopted to decrease network traffic and improve system security. In present, CIVIC has been simulated on NS2, evaluated on hardware platforms.
    Wireless Communications, Networking and Mobile Computing, 2007. WiCom 2007. International Conference on; 10/2007
  • Hai-ying Zhou, Kun-mean Hou
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    ABSTRACT: The operating systems of wireless sensor networks should be suitable for strict-constrained system resources and support two operation modes: event-driven & multi-threading. Traditional embedded operating systems are generally not fit for WSN applications. This paper presents a smart, resource-aware, low-power-consuming and distributed real-time micro-kernel: LIMOS. LIMOS adopts an event & thread two-level system architecture and a two-level scheduling policy: 'non pre-emption priority based' high level scheduling for events; and 'preemptive priority-based' low level scheduling for threads. The scheduling scheme is predictable and deterministic with respect to real-time applications. A unique system interface and a system primitive-pair, i.e. tuple and IN & OUT, are proposed for all kinds of system synchronization and communication. LIMOS integrates the advantages of tinyOS and SDREAM. It allows running in different modes. The combination of two kernels extends greatly the application range of LIMOS from simple single-task to multitask applications. In present, LIMOS has been evaluated on several hardware platforms and ported for different applications.
    01/2007;
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    ABSTRACT: The urban public transportation systems are usually not appropriate for disabled, wheelchair and blind passengers (DWB). This paper introduces the MobiPlus system that aims at improving the public transportation service so as to meet the needs of DWB. The MobiPlus system is an intelligent wireless bus-station interactive system with the integration of multi-wireless techniques (RFID, ZIGBEE, WiFi, and GPS). It consists of three subsystems: DWB detection subsystem, wireless communication subsystem, and bus service subsystem. This paper presents the design of the MobiPlus wireless interactive system at different levels, such as hardware, software and protocol, and also gives the function description of its three subsystems. Currently, this system has been implemented and is under evaluation at Clermont-Ferrand city, France.
    Wireless, Mobile and Multimedia Networks, 2006 IET International Conference on; 12/2006
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    ABSTRACT: The Operating Systems (OS) dedicated to Wireless Sensor Network (WSN) are becoming an important research topic in recent years. This kind of OS has two natures: the resource-aware design and the wireless routing capability. This paper presents a Novel Hybrid Operating System (NHOS) dedicated to WSN. It consists of two parts: a hybrid real-time micro-kernel: LIMOS (LIghtweight Multi-Threading Operating System); a dedicated hybrid wireless protocol stack: CIVIC (Cooperative Inter-Vehicle Intelligent Communication). LIMOS combines the advantages of TinyOS and SDREAM. It has tiny resource consumption and supports the distributed real-time multi-thread applications. CIVIC is a context-aware routing protocol which is implemented to support the infrastructure and ad-hoc network, the hybrid MANET protocol and the multi-support wireless access mediums. This paper demonstrates the key features of NHOS.
    Wireless, Mobile and Multimedia Networks, 2006 IET International Conference on; 12/2006
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    ABSTRACT: TinyOS is a natural event-driven single-task system. It fits for the single-task specific-application but not for the real-time multi-task application; while, SDREAM is a typical distributed real-time micro-kernel. It supports real-time multi-task applications but normally consumes more resources. This paper presents a novel hybrid real-time micro-kernel: LIMOS (lightweight multi-threading operating system), which combines the features of TinyOS and SDREAM. LIMOS adopts the event & thread two-level architecture and correspondingly has a two-level scheduling policy: 'event-driven' (high level scheduling for events) and 'priority-based preemptive' (low level scheduling for threads). LIMOS adopts the LINDA concept: tuple space and in & out primitive-pair for system synchronization & communication. At present, LIMOS has been applied into a wireless application with the integration of multi-wireless techniques (RFID, ZigBee, and WiFi)
    Wireless Communications, Networking and Mobile Computing, 2006. WiCOM 2006.International Conference on; 10/2006