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The mobile cloud computing (MCC) that takes wireless access network as transmission medium and uses mobile devices as client becomes the newest evolution trends of cloud computing. When offloading the complicated multi-task application to the MCC environment, each task executes individually in terms of its own computation, storage and bandwidth requirement. Due to user's mobility, the provided resources...
Considering load uncertainties in the DC-DC buck converter, the mismatched disturbances are imposed on the system, which would cause degradation of the control performance. Conventional backstepping control (BSC) scheme fails to achieve a high precision performance especially in the presence of strong disturbances. In addition, the disturbances caused by load uncertainties are complex in reality,...
A 45 nm high In component metamorphic In0.7Ga0.3As/In0.6Ga0.4As composite-channel high electron-mobility transistor (mHEMT) on GaAs substrate with good DC and RF performance has been developed. The structure was grown by molecular beam epitaxy and exhibits a superior electron mobility of 10200 cm2/(V.s) and a sheet density of 3.5 × 1012 cm−2 at a room temperature. A combined optical and e-beam lithography...
Based on the combination of large eddy simulation theory and Lighthill's acoustic analogy equation, numerical simulation of underwater flow noise is investigated. The calculation model of nozzle and fluid is built up by finite element software, ANSYS. The property of fluid field is calculated by the software, Fluent, which is in the ANSYS. The fluid property changing with time is gotten and dealt...
Information-centric networking (ICN), an alternative for future networking architecture, offers great benefits to both consumers and producers from various dimensions, such as scalability, security and mobility. Unlike IP packets containing geographically dependent and host-centric IP addresses, neither ICN interest packets (issued by a content requester or consumer) nor ICN data packets (generated...
As wind and rain generated noise is an important part of ocean ambient noise, carrying out research on its regularities and characteristics is of great significance in both theory and potential military application. In this paper, the problem addressed is that of the ocean ambient noise field, which is to be thoroughly researched; and, the contribution of wind and rain, which is the main contribution...
An Unmanned Underwater Vehicle (UUV) is mainly composed of a large number of rotating parts, such as bearings and motors. The radiated noise of an UUV is mainly caused by mechanical vibration. In order to reduce noise and provide a foundation for noise source identification, quantitative measurement of the radiated noise source level is critically required. The classic measuring method is a sea or...
The non-anechoic tank with elastic boundary is a widely used experimental apparatus, and mastering the sound field characteristics is very important for acoustical testing. But the predicting methods still need to improve to ensure a better fit with sound field testing. Considering the enormous differences of the characteristic impedance between air and water, the analytical model of a non-anechoic...
The far-field distance of underwater structure sound sources is usually considered, especially in underwater acoustic combat, target detection, vibration reduction and noise control. There exist two formulas for the determination of far-field distance. One is derived from a uniformly vibrating piston in a rigid boundary. The other formula is usually used in finite element software. However, underwater...
The core concept of software-defined network (SDN) is the separation between control plane and date plane. SDN provides a programmatic interface to network control, significantly simplifies network management and improves the efficiency of network utilization. To further improve network performance, scalability and reliability, it is recommended to deploy multiple controllers in SDN. However, network...
Distributed Software Defined Networking federates multiple controllers In a network to solve the problems In single controller networks, e.g., to improve network reliability and reduce the delay between controllers and switches. However, in the current distributed SDN schemes, the mapping between SDN switches and controllers is statically configured, which may result in uneven load distribution among...
In the field of reliability and environmental testing, temperature system is essential for simulating temperature conditions. The temperature system is a time-varying, large time-delay and nonlinear system. When the system parameters are changed, the target value can not reach the set-target value. The closed-loop identification is always one of the main contents in the field of industrial advanced...
Microwave heating can widely be seen in industrial application. A new method for microwave heating numerical calculation and simulation is proposed in this paper, which coupling with Fourier equation and Maxwell's equation. The method use FDTD method to solve Maxwell's equation and Euler method to get differencing heat transfer equation. The numerical analysis results show that the temperature and...
Considering the influence of slow response characteristic of a high-power proton exchange membrane fuel cell (PEMFC) on a grid-connected system adequately, a 150 kW PEMFC grid-connected system, including a PEMFC power unit based on a Ballard Stack Modules-FCvelocity™ HD6 is developed in this study. Moreover, then an active control strategy with vector-proportion integration controller is proposed...
To realize exercises of Chinese character writing under unattended operation, a real-time evaluation technology for quality of strokes of handwritten Chinese characters is proposed. Its advantages lie in the fact that it decomposes the features of handwritten strokes into macrocosmic and microcosmic views. Macrocosmically, it can effectively identify various open clerical errors by inspecting topological...
This paper described the design and implementation procedure of Transmission Control Protocol (TCP) hardwiring and TCP offloading engine based on Field Programmable Gate Array (FPGA). The design consists of several modules, and the connection among modules is implemented by buses. The result shows that some functions are realized in this design. The most contribution of this paper is that the design...
In this paper, we mainly study the key technical issues of Network-on-Chip (NoC), focusing on the analysis of typical NoC mapping problems, and making further research on the fault-aware NoC task mapping. Firstly, we study some critical problems in the design of NoC task mapping, then summarized a fault model, and finally, verified the related issues of NoC on verification platform and Field Programmable...
Flexible load has increasingly becoming an important means of regulating the power grid and consuming new energy, as well as an important part of "source-grid-load" coordination control. On the other hand, nowadays typical new energy resources such as wind and solar energy are being accessed to the power grid in a large scale, but the phenomenon of abandoning wind or solar energy is very...
Learning based hashing is gaining traction in large-scale retrieval systems. It aims to learn compact binary codes that can preserve semantic similarity in the hamming space. This paper presents a supervised topology hashing (SPTH) algorithm to learn compact binary codes that can exploit both the supervisory information as well as the local topology structure of datasets. To build a connection between...
Many kinds of efficient greedy subspace clustering methods have been proposed to cut down the computation time in clustering large-scale multimedia datasets. However, these methods are easy to fall into local optimum due to the inherent characteristic of greedy algorithms, which are stepoptimal only. To alleviate this problem, this paper proposes a novel greedy subspace clustering strategy based on...
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