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For the first time, both pull-in and release transients were characterized under high RF power levels on electrostatically actuated capacitive switches that exhibited little ambient temperature dependence under small-signal conditions. In spite of the complication of buckling, thermal resistances and time constants were extracted for both pulled-in and released states. In the pulled-in state, the...
This paper reviews the advantages and shortages of the covariance intersection (CI) and ellipsoidal intersection (EI) methods for decentralized state fusion with unknown correlation, and makes some progress on both of them. New results are: a). For CI method, the convexity property is proved for the two classical cost functions (i.e., trace and natural logarithm of determinant of the fused covariance),...
Small- and large-signal RF characteristics were measured on AlN/GaN HEMTs with 80–160 nm gate length and 100–300 μm gate width. Consistent with the literature, current-gain cut-off frequency and maximum frequency of oscillation were found to increase with inverse gate length independent of gate width. For the first time, output power and efficiency were reported at the high end of X-band, and were...
In this paper, we perform Chinese text classification using N-gram (uni-gram, bi-gram and mixed uni-gram/bi-gram) frequency feature instead of word frequency feature to represent documents and propose the use of mixed uni-gram/bi-gram after feature transformation. We further propose a serial approach based on feature transformation and dimension reduction techniques to improve the performance. Experimental...
The ruggedness of HBT Class-C power amplifiers was improved by adding an anti-parallel diode to the amplifier input to limit the negative swing of the base-emitter voltage. The improved amplifier could withstand 3∼1 instead of 2∼1 mismatch in CW operation, and 2.5∼1 instead of 1.5∼1 mismatch in pulse operation. In contrast to other approaches with emitter ballast, active feedback, or electrostatic...
The purpose of this study is to analyze the influence factors of farmland circulation. Theory analysis and empirical study were employed. The results indicate that farm households' behaviors result from kinds of factors, including social economy factor, market and property right condition, participators' condition. Contract land per person, non-agricultural income per person, agricultural members...
Lime is an important smelting raw material for iron& steel plants. Most of large and medium-scale iron& steel enterprises have their own lime works for self-supply. Reasonable control for the lime kiln is significant to reduce energy consumption and improve the pass rate of lime quality. In this paper, the model described in literature is applied to simulate the actual operating conditions...
Traffic analysis attacks are passive attacks that try to deduce the traffic pattern based on the eavesdropped information. Through analyzing the packet traffic, it can deduce the location of strategic nodes, and then launch an active attack to those locations, such as DoS attack. Therefore, defending against a traffic analysis attack is to prevent the adversary from tracing the location of critical...
A digital gradient-ascent algorithm is presented to identify and maintain the peak power operating point of a photovoltaic (PV) source with variable I-V characteristics. The approach employs a low-level dither, realized by a one-bit, 64-sample pseudorandom noise (PN) sequence, to perturb the duty cycle of a boost converter that extracts energy from a PV source for battery charging. The digital-domain...
In order to describe the uncertain relationship between elements in the system, the concept of interval number is used in ISM by defining the relation ambiguity. An interval number interpretative structural modeling is constructed and its implementation procedures are given. At the last, an example of technology innovation of small and medium-sized businesses would be used to show the application...
Instant wireless sensor network (IWSN) is a type of WSN deployed for a class of special applications which have the common requirement on instantly responding for collecting and transmitting sensory data, e.g., volcanic eruption monitoring or nuclear leakage detection. In this paper, having a cluster-based WSN, we present a compensation-based reliable data delivery protocol (CRDD) to collect and transmit...
Denial of service (DoS) attack is an impelling inside attack in the form of interference or collision at the receiver side, which can causes serious damage to the functions of wireless sensor networks (WSNs). In this paper, we propose a solution using one-way hash function to generate dynamic keys ensuring that even if the adversaries may acquire the current or earlier keys, they have no ability to...
In this paper, we propose a novel cooperative localization algorithm which can be effectively used in mobility-assisted wireless sensor networks (WSNs). We propose an attractive movement strategy with mobile elements (MEs) to improve the network performance and address limitations of static WSNs in node localization. In our scheme, a mobile sensor node cooperates with static sensor nodes and moves...
A new power quality monitoring and management system based on a new embedded computer technique which contains digital signal processing (DSP) and advanced RISC machine micro-programmed control unit (ARM MCU, shortened as ARM hereinafter) is introduced in this thesis. Its realization of hardware system and software system are analyzed, and its main functions and characteristics are expatiated on....
Distributed generation (DG) brings new green energy to the power system, meanwhile it also brings more power quality disturbances. According to the power quality disturbances of grid-connected distributed generation system, a new idea of the power quality auto-monitoring for distributed generation based on virtual instrument is proposed in this paper. Its realization of hardware system and software...
According to limitation of traditional methods, a new optimization model of reactive power compensation of power system including distributed generation is proposed, in which investment of the equipment, electrovalence and other factors of the complex power network are considered. According to the optimization model, an optimization scheme of fuzzy dynamic programming is introduced, in which fuzzy...
We determine, for both countable and uncountable collections of functions, information-theoretic conditions on a penalty pen(f) such that the optimizer f of the penalized log likelihood criterion log 1/likelihood(f)+pen(f) has risk not more than the index of resolvability corresponding to the accuracy of the optimizer of the expected value of the criterion. If F is the linear span of a dictionary...
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