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Dynamic spectrum access is the key to solving worldwide spectrum shortage. The open wireless medium subjects DSA systems to unauthorized spectrum use by illegitimate users. This paper presents SpecGuard, the first crowdsourced spectrum misuse detection framework for DSA systems. In SpecGuard, a transmitter is required to embed a spectrum permit into its physical-layer signals, which can be decoded...
There are some persons who stand out prominently in any review of the history of polyesters. This chapter talks about two giant polymer scientists Staudinger and Carothers and their contributions to the origin and further development of polymer science as well as some historical records on the synthesis of polyamides and polyesters. Three well‐known biodegradable polyesters, namely, Poly(lactic acid)...
In this paper, a control strategy for the parallel operation of three-phase inverters forming an online uninterruptible power system (UPS) is presented. The UPS system consists of a cluster of paralleled inverters with LC filters directly connected to an AC critical bus and an AC/DC forming a DC bus. The proposed control scheme is performed on two layers: (i) a local layer that contains a “reactive...
Human can judge driver's driving ability by observing the vehicle motion in different traffic scenes. Identically, driving behavior can be the main basis for evaluating the performance of an unmanned vehicle in both field test and simulation test. Although simulation test avoids disadvantages of field test, existing simulation systems lack traffic scene data with perception granularity of visual sensors...
Routing schemes play an important role in the network. In terms of the information utilized by routing, the existing schemes can be classified into two main groups: topology-based routing and geographical routing. The former can always guarantee the optimal path, but its routing tables often contain massive entries which seriously impact the algorithm's efficiency. The latter can not guarantee the...
According to the requirements and characteristics of the simulation tutoring system for weapon utilization, a knowledge base depending on the domain ontology was designed to support the knowledge representation of the tutoring system. At first, we introduced the structure and function of the simulation tutoring system. Then we can master the key points of using specific weapon by processing the information...
This paper studies the dynamic response of a highspeed ball-screw drive in a machine tool feed system. The Timoshenko beam theory is employed to model the rotating screw, while the nut is modeled as a lumped moving mass subjected to an external force resolved into three mutually perpendicular components. The dynamic model of the ball-screw drive is formulated based on the assumed mode method. To study...
The aim of this paper is to present an integrated decision making framework for weapon application under uncertain environment. Within this framework, concise decision rules are extracted initially from original decision data based on fuzzy rough set theory. A set of appropriate weapon systems are identified through intuitionistic fuzzy reasoning using extracted fuzzy rules. Next, the optimal weapon...
This paper analyzes the influences of displacement sensor noise on the power amplifiers of active magnetic bearing systems in both current and voltage control schemes. An effective evaluation index has been proposed to guarantee that the comparison is meaningful and fair enough to both control schemes. In addition, an appropriate controller is designed for each control scheme, while each controller...
Voice capacity over wireless local area networks (WLANs) can be increased by the statistical multiplexing among on/off voice calls. However, in previously proposed schemes, the admitted voice calls that transit from silence state to talkspurt state are mixed up with the new voice calls to contend for the channel. The increase in the traffic load of new voice users could degrade the performance of...
Text summarization is of great importance to solve information overload. Salience and coverage are two most important issues for summaries. Most existing models extract summaries by selecting the top sentences with highest scores without using the relationships between sentences, and usually represent the sentences simply basing on lexical or statistical features. As a result, those models can not...
To explore the regularity of clinical medication of Gastro-esophageal reflux disease (GERD) through text mining approach. Literatures on GERD in SinoMed(Chinese biomedical literature service system) were collected. Results: BANXIA, CHAIHU and HUANGLIAN were commonly used Chinese herbs in sequence from high to low, the network of Chinese herbs, symptoms and patterns could be established. Conclusion:...
Recent technological advances have enabled the generation of various omic data (e.g., genomics, proteomics, metabolomics and glycomics) in a high-throughput manner. The integration of multi-omic data sets is desirable to unravel the complexity of a biological system. In this paper, we propose a new approach to investigate both inter and intra relationships for multi-omic data sets by using regularized...
Dynamic thermal management methods are important to control the temperature of microprocessor at runtime and improve the reliability performance of the chip. In this paper, a model predictive control based dynamic thermal management method is proposed with hybrid thermal regulation techniques combining task migration and dynamic voltage frequency scaling (DVFS) methods. The new method is able to track...
A new framework to construct 3D traffic scenes for unmanned vehicle simulation evaluation is proposed in this paper. The “floor-wall” geometry is applied for traffic scenes construction process which consists of two stages. The first stage is road planes specification implemented by support vector machine (SVM) and Markov random field (MRF) using superpixels. In the second stage, control nodes of...
Simulation testing is an initial phase for the development of autonomous vehicle system. The developers can ensure the model they use behaves as close to the actual vehicle as possible in this cycle. This paper proposed a novel traffic scene modeling approach using image sequences and road GIS data. Such method was contributed to building a simulated environment for autonomous vehicle software systems...
In three dimension multiple-input multiple-output (3D MIMO) systems, large number of antennas are arranged at base station (BS) to obtain high spectral efficiency and large throughput. But increase of BS antennas also enhances the computational complexity of the multiuser precoding algorithm such as block diagonalization (BD) significantly. For the dimension increase of channel matrix, various ways...
This paper describes a cylindrical moving magnettype linear actuator with high response characteristics. This motor was mainly driven by rectangular or single-phase AC power with features of compact configuration, large thrust force, short stroke, high efficiency. Based on the established mathematical model using equivalent magnetic circuit method and the finite element model, the magnetic driven...
This paper presents an optimized regulation method on ampere density and coil space factor of switched-reluctance machine (SRM). These two factors are crucial and have significant influence on the performances of SRMs such as the electromagnetic torque output, the efficiency, the power density and the heat effect. But it is always difficult to set these two factors within the suitable range and to...
The color feature is one of the main features in person re-identification. Due to the illumination variation and similarity interference, the color feature is not robust. For practical applications, different pedestrian may have similar statistical distribution in terms of color histogram, while the same pedestrian may have different statistical distribution. However, it can be observed that although...
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