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Parameters estimators for K distribution have a relatively bad performance when the size of samples is small. An estimator based on the Bayesian theory is proposed here based on the prior distribution for the shape parameter, which is obtained from the real dataset. The simulated experiments demonstrate that the proposed method has the low relative error and low root mean square deviation compared...
Due to its lots of advantages, CT20 type spring operating mechanism is widely used in the 126kV high voltage circuit breaker. This type mechanism should not meet the requirement of higher interrupting capacity circuit breaker while the interrupting capacity is increasing. In this situation, sometimes the vibration of the closing latch during closing may cause the closing process failed if there is...
Porcelain post insulators are widely used in power equipment as insulation-supporting structure. The current standard has clear requirement for the overall strength of porcelain post insulators; however, the operation and maintenance data of various operating conditions show that shed damage is a major failure type of porcelain post insulators. At present, strength verification of cantilever beam...
We address the problem of dense visual-semantic embedding that maps not only full sentences and whole images but also phrases within sentences and salient regions within images into a multimodal embedding space. Such dense embeddings, when applied to the task of image captioning, enable us to produce several region-oriented and detailed phrases rather than just an overview sentence to describe an...
The unmanned surface vessel (USV) can provide effective means for ocean exploration and traffic regulation, and has become a research hotspot in the field of marine shipping because of its low cost, high efficiency and other advantages. To realize the accurate control of USV movement can provide technical guarantee for the realization of USV autonomous navigation. The research of USV course control...
This paper, based on the three dimension (3D) coordinates, presents the cause of the zero-sequence voltage in the open winding asynchronous motor system which is driven by double inverters with single power supply. The large vectors which have zero-sequence voltage are selected to realize PWM. For eliminating the zero-sequence voltage, the space zero vectors are inserted in every control period. This...
In this paper, a composite method based on least squares support machine (LS-SVM) and backstepping is proposed for the ship heading control. In the method, the control object is set up as the response model, which could consider the delay of the ship's steering gear. Firstly, a feedback controller is designed by backstepping, and a feedforward inverse controller is trained by LS-SVM. Then the backstepping...
We develop a unified framework for complex event retrieval, recognition and recounting. The framework is based on a compact video representation that exploits the temporal correlations in image features. Our feature alignment procedure identifies and removes the feature redundancies across frames and outputs an intermediate tensor representation we call video imprint. The video imprint is then fed...
Aiming at the real-time monitoring of Sewage in the service area. This paper presents a sewage quality monitoring system based on ZigBee wireless sensor network. Wireless sensor networks adopt star structure, the system consists of data acquisition terminal node, the coordinator node and the monitoring center. The terminal node sends the collected data to the coordinator node, Coordinator node sends...
The wireless monitoring and management system of tower crane based on Modbus / TCP protocol is designed for the distributed, efficient and safe operation of tower crane. Designing monitor surveillance terminal with Cortex A8 and WinCE6 as platform for real-time monitoring of state information of tower crane operation. And then, Using Modbus / TCP protocol to design a wireless communication message,...
Device-to-device communication and energy harvesting are both key technologies to improve spectrum and energy efficiency. In this paper, we investigate the resource allocation problem for the energy harvesting-powered D2D communication underlaying cellular networks, where D2D pairs firstly harvest energy and then transmit information signals. The goal is to maximize the sum throughput via joint time...
Device-to-device (D2D) communication is a promising technique to enhance spectrum efficiency of the cellular systems by enabling direct transmissions between end users close to each other. However, the arising interference issue should be carefully addressed to obtain the potential spectrum efficiency gains. In this paper, we develop an approximate interior point method to maximize the sum throughput...
Future avionics is no longer mere close electronic systems with the requirement changed, while it is pervasively controlled by dozens of frequent information exchange, open architecture and highly automatic systems. And this transformation has driven major advancements of security in avionics which contains computing security and communication security. Our team is focused on the security of next...
This paper presents a simulation of a biological olfactory neural system with a KIII set, which is a high-dimensional chaotic neural network. The KIII set differs from conventional artificial neural networks by use of chaotic attractors for memory locations that are accessed by, chaotic trajectories. It was designed to simulate the patterns of action potentials and EEG waveforms observed in electrophysioloical...
Atmospheric turbulence (AT) induced crosstalk can significantly impair performance of free-space optical (FSO) communication link using orbital angular momentum (OAM) multiplexing. OAM-multiplexed communication is equivalent to the Multiple-input Multiple-output(MIMO) system. And MIMO equalization is a good method to mitigate the crosstalk existing in MIMO system. Based on the reason above, we propose...
In this paper, a novel ultrasonic motor based on the out-of plane flexural vibration mode is designed. The motor consists of a hollow carbon cylinder and a disc-type coplanar piezoelectric trimorph actuator. The cylinder is glued in the center of the metal disc. The electrodes of the piezoelectric layers of the actuator are divided into the four equal sections. There are four piezoelectric plates...
Recently, Cloud based services have become very popular, and many people are willing to use cloud services because of their convenience. For instance, people would like to store their files in the cloud storage, and the files may contain important data or private information. If important files are accessed by unauthorized users due to unsecure cloud services, it may cause financial losses and people...
In this paper, we study robust spectrum sharing under channel uncertainty in a cognitive radio network (CRN), where a great number of secondary users (SUs) and a primary user (PU) coexist with each other sharing the same frequency spectrum. Considering the practical challenge that the channel gain between SU transmitters (SU-Txs) and PU receiver (PU-Rx) is typically uncertain, a probabilistic interference...
Interferometric Surface Plasmons (SPs) microscopic sensing can be used to measure the thickness or refractive index variation of nanomaterial within the order of diffraction limit in the lateral directions. However experimental results in literatures have shown the technique suffers from severely low signal to noise ratio (SNR) which limits its practical resolution and may cause failure of the technique...
To address the non-stationary property of aging patterns, age estimation can be cast as an ordinal regression problem. However, the processes of extracting features and learning a regression model are often separated and optimized independently in previous work. In this paper, we propose an End-to-End learning approach to address ordinal regression problems using deep Convolutional Neural Network,...
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