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The mathematical models of the permanent magnet synchronous motor (PMSM) are complex systems, characterized by high coupling, nonlinearity, parameter variation and they are highly influenced by disturbances. Conventional PID control method cannot make the system set value tracking and interference suppression both in optimal. In this paper, a two-degree-of-freedom (2DOF) PID controller with a set-valued...
The Underwater acoustic beacon is one of the most commonly used ocean acoustic instruments. It is installed in the underwater carrier and transmits signals according to certain rules. In this paper, we introduce an underwater acoustic beacon detection system based on a wavelet packet transform. The system is composed of a ruggedized computer, a directional receiving transducer, an angle sensor, a...
Modern General-Purpose computation on Graphics Processing Units (GPGPUs) explore parallelism in applications by building massively parallel architecture and apply multithreading technology to hide the instruction and memory latencies. Such architectures become increasingly popular for parallel applications using CUDA/OpenCL programming languages. In this paper, we investigate thread scheduling algorithms...
Modeling and estimating the primary user (PU) behavior is critical to implement dynamic spectrum access in cognitive radio networks. In this paper, we investigate the estimation accuracy of the PU behavior based on the Markov model. Maximum Likelihood (ML) estimation is employed to estimate the transition probabilities of the Markov model based on the sample sequence of PU idle/busy states. An approximate...
Real-time motion detection is a key technology in the intelligent video surveillance and traffic video flow. Widely used methods based on monocular vision are sensitive to light and have problems of black hole and shadow. To solve these problems, we proposed a motion detection method based on binocular vision. The segmentation of move object is based on the distinctive of depth information which is...
The comparisons of fat coal from Shandong Province, Shanxi Province, Anhui Province through proximate analysis, plastometric indices, Gieseler fluidity, Arnu-Audibert's dilatometer, coke optical texture of single coal are studied. It's pointed out that it's not enough just by proximate analysis, plastometric indices to evaluate fat coal quality. They are quite different in the aspects of Gieseler...
The article used coke oven gas as desorption agent, pilot-scale packed tower as desorption equipment, removed ammonia from wastewater produced by coal dry distillation process. Gas stripping method is a new technology for ammonia removal. Through experiments conducted in the coking plant, when the temperature of wastewater T=85°C, pH=11.5, the ratio of liquid and gas volume n=550∶1 and the addition...
We investigate the channel assignment problem in a cluster-based multi-channel cognitive radio sensor network in this paper. Due to the inherent power and resource constraints of sensor networks, energy efficiency is the primary concern for network design. An R-coefficient is developed to estimate the predicted residual energy using sensor information (current residual energy and expected energy consumption)...
In this paper, we study the network queuing effects on the VoIP delay and jitter. Two service polices, FIFO and Differentiated Service (DiffServ), are studied with repect to the queuing delays of VoIP packets. First, we present our assumptions for delay characterization. Then, we provide a model for the traffic flow. We create a ??Markovian+Deterministic (M+D)?? model in order to represent the traffic...
Perspective distortion often appears in the image documents which were token by digital camera. This phenomenon will lead to recognition errors or failures. Therefore, a new correction algorithm is proposed in this paper for perspective distortion images of Chinese documents. The algorithm makes use of Chinese document image's horizontal characteristics of text line and Chinese characterpsilas features...
This paper proposed a modified vertical-Bell Labs layered space-time (V-BLAST) system, where different delay offsets are intentionally applied to the spatially multiplexed data streams in order to improve bit error rate (BER) performance. The proposed system can use only one receive antenna to recover the transmitted information by zero forcing (ZF) detection, whereas the conventional synchronous...
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