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Based on the power system's stability and control theory, the paper carries out intelligence stability analysis of power system with big data technology. With big data and data mining technology, the paper takes advantage of the useful information from massive data, and makes out the corresponding security and stability of power system intelligent analysis and decision making through the intelligent...
Wind power forecast error has been considered to be the factor that increases the difficulty of power system dispatch, decreases the economy of system operation, and affects the wind power accommodation. A multiple time scales dispatch model of wind power integrated system is built considering the wind power forecast error and demand response. The price-based demand response (PDR) is used in the initial...
Autonomous guided airdrop systems based on ram-air parafoils have been addressed to obtain the precision and accuracy of airdropped payload delivery, which has been studied as a two-body system, with flexible structure and 9 degrees of freedom (DOF). The gliding path of parafoil-payload system is directly affected by airdropping zone terrain model, which can be simplified and employed to generate...
This paper introduces an aperture encoded imaging radar (AEIR) system. Compared with the synthetic aperture radar (SAR) and Inverse SAR (ISAR) radar, the AEIR system can extract the image for both static and moving targets when the system is at rest. The core of the framework is the architecture that we construct for the AEIR imaging system. The AEIR system is composed of 1 radiation radar and several...
In this paper, we propose a synthetic aperture radar (SAR) image change detection algorithm based on SAR image nonstationary analysis and conditional random field (CRF) model. This algorithm segments the SAR images into two nonstationary regions with the Triplet Markov Field (TMF) model which incorporates a U field to describe the images' nonstationary nature. The combined posterior probability of...
Under the outfield condition, Portable Maintenance Aids (PMA) combined with Interactive Electronic Technical Manual (IETM) can assist maintenance personnel in doing maintenance training and fault diagnosis, which has an important research value. PMA-based IETM system is mostly developed by Client/Server (C/S) model. The systems based on C/S model are poor in compatibility, high in development cost...
The graphical display of the fault tree is urgently needed for the equipment in fault diagnosis and reliability analysis, while the practical application of the fault tree drawing and display is mostly achieved under the Client/Server(C/S) mode which lacks portability, universality. Thus, a fault tree graphic drawing software based on Visio Drawing Control 2007 has been proposed by using C# language...
A wideband single-layered circular polarizer is presented. The centrosymmetric dual-loop unit cell is employed in the periodic structure. Numerical analysis are given to investigate the polarizer's working principle. The measured results validate the design and show that the 3dB axial ratio band covers from 19.3GHz∼31.8GHz.
Being an integral part of the software system development process, collaboration is demanded in every stage of the process lifecycle. Ensuring the effectiveness and correctness of collaborative efforts is challenging, therefore, establishing a structural procedure is generally good practice to avoid unnecessary coordination overhead. As the need for complex software systems increases, collaboration...
In order to improve the channel bandwidth utilization of voice communication, a variable bit rate speech coding algorithm based on enhanced mixed excitation linear prediction (MELPe) is proposed in the paper. In voice communication, only about 40% of the time is occupied by talking, whereas the rest is engaged by silence or background noise. In addition, unvoiced frame usually requires less transmission...
This paper presents a speech protection system based on adaptive masking. The system can adaptively adjust the masking noise volume according to the Speech Intelligibility Index (SII) proposed in ANSI S3.5-1997. The volume of the masking noise is minimized by limiting SII to a low level at which the speech to be protected can not be understood. This method can effectively reduce excess masking noise...
This paper presents a novel wheel massage robot which can achieve hammer, rolling, kneading and other massage operations, and a complete coverage algorithm of massage path planning - improved reciprocating path planning algorithm. Based on the massage robot and traditional Chinese massage, the requirements of path planning of wheel massage robot and the features of traditional reciprocating path planning...
The field of wireless power transfer (WPT) has been revitalized since the development of resonant induction technique. Recent research has covered new areas for WPT system in air. However, for WPT in the ocean environment, it is still very much in the research portion of its development. The stochastic nature of the ocean makes transferring power wirelessly very difficult to achieve. This paper investigates...
This work presents a model of a transducer array suitable for particle transportation. The transducer array is excited by sine function in voltage. The distributions of horizontal acoustic radiation forces are simulated using ANSYS and MATLAB-base program. The underlying motion equation is described in this paper. According to this equation, the motion trajectory of a levitated particle is calculated...
With rapid development of information technology and upgrading of intelligent terminals, two-dimensional barcode has been widely used as a carrier to store, transfer and retrieve information. Due to the limited capacity, current two-dimensional barcodes are designed to embed text-only messages. In this paper, a generation method for acoustic two-dimensional barcode is proposed. It is based on speech...
Detecting eyes in images is fundamental for many computer vision applications including face detection, face recognition, and human-computer interaction. Most existing methods are designed and tested on datasets acquired under controlled lab settings (e.g., fixed scale, known poses, clean background, etc.), leaving their performance to be further examined on real-world, uncontrolled images, such as...
Based on the public key compressing technique and the Chinese Remainder Theorem, an efficient somewhat homomorphic encryption (SWHE) scheme is proposed, whose security can be reduced to the approximate greatest common divisor problem. Then the fully homomorphic encryption scheme is obtained by using Gentry's squashing decryption circuit technique, which could resist chosen plaintext attacks. The efficiency...
The effects of zinc-oxide/salt with different contents in the aluminum soldering flux on the interfacial microstructure of Sn-0.7Cu/6061Al and mechanical property of 6061Al/Sn-0.7Cu/6061Al joints were investigated. Results show that the flux containing zinc-oxide and zinc-salt can effectively remove the oxide film on surface of 6061Al and result in formation of corrosion pits at the interface of the...
Affective state recognition based on multiple modalities of physiological signals has been a hot research topic. Traditional methods require designing hand-crafted features based on domain knowledge, which is time-consuming and has not achieved a satisfactory performance. On the other hand, conducting classification on raw signals directly can also cause some problems, such as the interference of...
In this paper, the stress distribution and weak point of Au bonding wire in Chip-On-Board (COB) package were analyzed via a stress released model. In order to find out root cause and factors of it, simulations were performed to explain TC failure mechanism and how package styling affected the stress wire suffered. It is found out the stress distribution is related to loop direction. Based on this,...
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