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Search Results: 1 - 10 of 28421 matches for " Youxian Sun "
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Control-Scheduling Codesign: A Perspective on Integrating Control and Computing
Feng Xia,Youxian Sun
Computer Science , 2008,
Abstract: Despite rapid evolution, embedded computing systems increasingly feature resource constraints and workload uncertainties. To achieve much better system performance in unpredictable environments than traditional design approaches, a novel methodology, control-scheduling codesign, is emerging in the context of integrating feedback control and real-time computing. The aim of this work is to provide a better understanding of this emerging methodology and to spark new interests and developments in both the control and computer science communities. The state of the art of control-scheduling codesign is captured. Relevant research efforts in the literature are discussed under two categories, i.e., control of computing systems and codesign for control systems. Critical open research issues on integrating control and computing are also outlined.
New approach to stochastic stability and controller design for networked control systems

Shanbin LI,Youxian SUN,

控制理论与应用 , 2005,
Abstract: This paper addresses the random time-delays and packet losses issues of networked control systems (NCS) within the framework of jump linear systems with mode-dependent time-delays.A new delay-dependent condition on the stochastic stability is proposed by a new stochastic Lyapunov-Krasovskii functional.The condition is formulated as a set of coupled linear matrix inequalities (LMIs).As an example to verify the proposed method,an inverted-pendulum system with network is considered.The simulation results demonstrate the effectiveness of the method.
Novel Deployment Schemes for Mobile Sensor Networks
Jiming Chen,Shijian Li,Youxian Sun
Sensors , 2007, DOI: 10.3390/s7112907
Abstract: Virtual Force Algorithm (VFA) is becoming a main solution to area coverage forhomogeneous wireless sensor networks with random distribution of mobile sensor nodes.Consider the factors of the convergence, the boundary in Region Of Interest (ROI), effec-tive distance of acting force and useless moving, etc, VFA is improved to overcome the aboveproblems. Furthermore, an expression of exponential function for the relationship of vir-tual force is proposed to converge rapidly. Extensive simulation results indicate that theseimproved VFA get better performance in coverage rate, moving energy consumption, conver-gence etc. than original VFA.
The Deployment Algorithms in Wireless Sensor Net Works: A Survey
Jiming Chen,Entong Shen,Youxian Sun
Information Technology Journal , 2009,
Abstract: In this survey we focus on a variety of sensor nodes deployment algorithms that have been proposed and studied by researchers through the years. Some recent development of this research topic is introduced in a classified manner. We discuss the random deployment, incremental deployment and movement-assisted deployment algorithms and make comparisons between them in term of features, pros and cons, etc. Some related research topics such as the sensor model, localization techniques, communication range and sensing range, convergence and termination conditions are investigated in detail.
Feedback Scheduling: An Event-Driven Paradigm
Feng Xia,Guosong Tian,Youxian Sun
Computer Science , 2008,
Abstract: Embedded computing systems today increasingly feature resource constraints and workload variability, which lead to uncertainty in resource availability. This raises great challenges to software design and programming in multitasking environments. In this paper, the emerging methodology of feedback scheduling is introduced to address these challenges. As a closed-loop approach to resource management, feedback scheduling promises to enhance the flexibility and resource efficiency of various software programs through dynamically distributing available resources among concurrent tasks based on feedback information about the actual usage of the resources. With emphasis on the behavioral design of feedback schedulers, we describe a general framework of feedback scheduling in the context of real-time control applications. A simple yet illustrative feedback scheduling algorithm is given. From a programming perspective, we describe how to modify the implementation of control tasks to facilitate the application of feedback scheduling. An event-driven paradigm that combines time-triggered and event-triggered approaches is proposed for programming of the feedback scheduler. Simulation results argue that the proposed event-driven paradigm yields better performance than time-triggered paradigm in dynamic environments where the workload varies irregularly and unpredictably.
Cross-Layer Adaptive Feedback Scheduling of Wireless Control Systems
Feng Xia,Longhua Ma,Chen Peng,Youxian Sun,Jinxiang Dong
Sensors , 2008, DOI: 10.3390/s8074265
Abstract: There is a trend towards using wireless technologies in networked control systems. However, the adverse properties of the radio channels make it difficult to design and implement control systems in wireless environments. To attack the uncertainty in available communication resources in wireless control systems closed over WLAN, a cross-layer adaptive feedback scheduling (CLAFS) scheme is developed, which takes advantage of the co-design of control and wireless communications. By exploiting crosslayer design, CLAFS adjusts the sampling periods of control systems at the application layer based on information about deadline miss ratio and transmission rate from the physical layer. Within the framework of feedback scheduling, the control performance is maximized through controlling the deadline miss ratio. Key design parameters of the feedback scheduler are adapted to dynamic changes in the channel condition. An eventdriven invocation mechanism for the feedback scheduler is also developed. Simulation results show that the proposed approach is efficient in dealing with channel capacity variations and noise interference, thus providing an enabling technology for control over WLAN.
Fuzzy Logic Control Based QoS Management in Wireless Sensor/Actuator Networks
Feng Xia,Wenhong Zhao,Youxian Sun,Yu-Chu Tian
Sensors , 2007, DOI: 10.3390/s7123179
Abstract: Wireless sensor/actuator networks (WSANs) are emerging rapidly as a newgeneration of sensor networks. Despite intensive research in wireless sensor networks(WSNs), limited work has been found in the open literature in the field of WSANs. Inparticular, quality-of-service (QoS) management in WSANs remains an important issue yetto be investigated. As an attempt in this direction, this paper develops a fuzzy logic controlbased QoS management (FLC-QM) scheme for WSANs with constrained resources and indynamic and unpredictable environments. Taking advantage of the feedback controltechnology, this scheme deals with the impact of unpredictable changes in traffic load on theQoS of WSANs. It utilizes a fuzzy logic controller inside each source sensor node to adaptsampling period to the deadline miss ratio associated with data transmission from the sensorto the actuator. The deadline miss ratio is maintained at a pre-determined desired level sothat the required QoS can be achieved. The FLC-QM has the advantages of generality,scalability, and simplicity. Simulation results show that the FLC-QM can provide WSANswith QoS support.
LQER: A Link Quality Estimation based Routing for Wireless Sensor Networks
Jiming Chen,Ruizhong Lin,Yanjun Li,Youxian Sun
Sensors , 2008, DOI: 10.3390/s8021025
Abstract: Routing protocols are crucial to self-organize wireless sensor networks (WSNs),which have been widely studied in recent years. For some specific applications, both energyaware and reliable data transmission need to be considered together. Historical link statusshould be captured and taken into account in making data forwarding decisions to achievethe data reliability and energy efficiency tradeoff. In this paper, a dynamic window concept(m, k) is presented to record the link historical information and a link quality estimation basedrouting protocol (LQER) are proposed, which integrates the approach of minimum hop fieldand (m, k). The performance of LQER is evaluated by extensive simulation experiments to bemore energy-aware, with lower loss rate and better scalability than MHFR [1] and MCR [2].Thus the WSNs with LQER get longer lifetime of networks and better link quality.
A Algorithm of Fault Detection for Dynamic Systems with Boundedparameter Perturbation Based Onquadratic Programming
系统存在参数摄动时基于二次规划的一种故障诊断算法

Chen Jinshui,Sun Youxian,
陈金水
,孙优贤

自动化学报 , 1997,
Abstract: This paper presents a new method of fault detection for dynamic systems with bounded parameter perturbation by optimization technique. Firstly, we discuss that some faults can be detected by checking the concordance between the given model cluster and the input/output signals, then based on quadratc programming, a finite step termination algorithm is given to achieve the concordance examination.
Optimal Smith Predictor and its Robust Tuning
一类Smith预估器及其鲁棒整定

Zhang Weidong,Sun Youxian,
张卫东
,孙优贤

自动化学报 , 1997,
Abstract: An analytical approach is presented for the design of Smith predictor, which provides disturbance rejection and robustness simultaneously. It is shown that the Smith predictor is equivalent to a PID controller and can be implemented by conventional PID controller. Its closed loop performance is also discussed. An example is included to illustrate superiority of the approach.
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