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This paper investigates exponential stabilization of nonlinear switched systems with actuator saturation. Multiple Lyapunov functions approach is employed to obtain the stabilization sufficient conditions of the nonlinear switched systems under the time-dependent and state-dependent switching rules, respectively. Furthermore, several optimization problems are given to optimize the attractive region...
This paper is to design attitude coordination control strategies for multiple spacecraft by state feedback and output feedback. Based on Lyapunov theory and graph theory, first, bounded coordination synchronization controllers are developed by state feedback. Second, output feedback controllers are developed for coordination synchronization(i.e. without angular velocity feedback), it can guarantee...
Aiming at the characteristics of tunnel construction, this paper analyses the present situation of management of tunnel construction and puts forward collaborative management of cross river tunnel construction based on BIM. The purpose of this paper is to share and analyze information of whole life cycle project. The whole process of tunnel construction and information of all participants are all...
Performing scientific workflows on IaaS cloud may face the problem of uncertain task runtime, meaning that tasks' real execution time are different from their given or evaluated time. So the pre-determined scheduling scheme can not perform as expected, causing that scientific workflows can not be completed within deadline or the total cost is far beyond users' budget. To address this problem, we proposed...
The characteristics of cloud computing such as on-demand provisioning of virtual machines in a pay-as-you-go manner have attracted more and more scientific workflows deploying on cloud platforms. Since there are many types of virtual machines which are charged by time intervals, the difficulties of resource provisioning hinders efficient execution of scientific workflows on cloud platforms. To address...
To improve the efficiency of Cyber-Physical Systems (CPSs), based on Quantum Particle Swarm Optimization (QPSO), a new optimization algorithm named K-means Multigroup Quantum Particle Swarm Optimization (KMQPSO) for actuator node deployment in CPS is proposed in this paper. The algorithm clusters M sensor nodes into N classes by using K-means algorithm, and then generates an initial solution of algorithm...
Considering that the traditional gateway can't meet the requirements of the increasingly strict network security management, here we propose a design of security gateway based on firewall technology. We realize the real-time, dynamic and fine-grained control of the internal and external network of the gateway. This article introduces a method for gateway to be built, and it's based on the firewall...
The aim of this article is to recognize public speaking anxiety based on galvanic skin response through recurrence plot and recurrence quantification analysis. Twenty-two female subjects have participated in this study, and the anxiety state is induced by anticipated and real public speaking. Two nonlinear features, recurrence rate and entropy of diagonal length, are extracted from recurrence plots...
Time-frequency analysis is the important tool in signal processing, especially for non-stationary signals. When the interesting signals contaminated by impulsive noises, conventional time-frequency analysis method degenerate seriously because of lacking of limited second moment. In order to solve the degeneration of the estimation algorithm under non-Gaussian impulsive noise environment, the improved...
Ultrasonic ranging system has been used in many applications. In order to realize precisely positioning motion objects, ultrasonic sensors are adopted to measure their motions, and then their 2D coordinates should be positioned. This will lead to complicated calculations and then yield to measurement errors with improperly designed programs. This study addresses a method to realize automatically tracking...
With the development of multimedia technology and Internet, the amount of videos in the Internet is increasing quickly. Among the large amount of videos in the Internet, a considerable number of them are copies of original videos, which are simply revised versions of the original ones. The purpose of video copy detection technology is to detect copy videos, which has important applications in video...
In the visible light communication (VLC) orthogonal frequency-division multiplexing (OFDM) systems, the peak-to-average power ratio (PAPR) of OFDM signals is the primary concern of the transmission performance. In order to obtain low PAPR signals, we report and experimentally demonstrate a phase modulated OFDM system. The system can be reach 1.2Gbit/s under the standard illuminance level. And the...
The containment maneuvering problem involves two tasks. The first, called the geometric formation task, is to force the vessel outputs to converge to convex hull spanned by multiple parameterized paths. The second task, called the dynamic task, is to satisfy a desired dynamic behavior along the paths. A modular design approach is presented to develop the adaptive containment maneuvering controllers...
Due to the rapid growth of energy consumption and environmental issue, the use of photovoltaic (PV) power, has attracted many attentions since such energy is renewable and clean. This study proposes a simple yet effective method for PV power prediction in which a dividing-stage strategy is investigated and a hybrid heuristic, denoted as GAPSO (genetic algorithm and particle swarm optimization) is...
In order to reduce the redundancy of the traffic safety messages in the control channel and improve the successful messages delivery ratio, a traffic safety messages fusion algorithm is proposed based on the fuzzy theory. Here the correlation of messages between space and speed from different vehicles can be computed by fuzzy reasoning. And a group of optimal weight can be found using the least square...
The development of Internet of Things (IoT) is expected to be more rapid after the introduction of IEEE 802.11ah wireless local area network (WLAN) standard. IEEE 802.11ah standard is applicable to high-density WLAN system operating at sub 1 GHz band. In order to deal with the serious channel contention, collisions and hidden-node problems in the legacy distributed coordination function (DCF) protocol...
Apriori algorithm is a classical association rule mining algorithm, but it has problems about frequently scanning database and generating a large number of candidate sets. To solve these problems, an improved DC_Apriori algorithm was proposed, which restructured the storage structure of the database, improved connection of frequent item sets, the generation of k-frequent item sets is only need to...
The observation of the gigapixel image is the current research hotspot and how to view the image in short time is a big challenge. So in this paper we present an on-line viewing system of the distributed gigapixel image. We construct the MPI programming framework and use the MapReduce data processing model to stitch the subgraphs distributed in the different servers. Based on the size and location...
The paper proposes a series of novel routing algorithms to the issue of accessing the large-scale heterogeneous information over the Internet. Different from traditional ones, the perspectives of the routing are updated in terms of the quality of information accessing, the types of resources, the dominant driver and the expected consequences. The human capital is connected to form the social capital...
Internationalization of hospitality industry requires hotel talents to operate hotels with international vision and abilities. But at the same time hotel talents should adapt themselves to local environment. This paper, from the perspective of globalization and localization, analyzes the four abilities of hotel international talents with local features, i.e. communication ability, ability of applying...
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