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In operating conditions, real time non-destructive testing (NDT) is needed for the identification of tensile damage process of high-speed train gearbox shell. This paper focuses on the application of an acoustic emission (AE) method to study tensile damage. First, tensile tests with AE monitoring were employed to collect AE signals and tensile damage data. Second, feature extraction was performed...
This research solves the performance degradation problem of uncoded video system when the multiplicative noise caused by channel estimation error is not negligible. Through extensive analysis, we find that transmitting a specific part of source data by multiple channel use can decrease the mean end-to-end distortion and stabilize the video quality. However, under limited power and bandwidth constraints,...
The wireless communication technology is widely used in oil exploitation industry. Interference has become the key challenge of the oil field wireless communication networks. To solve the problem of interference, we proposed a novel grouping-based interference alignment scheme. Based on the structure of networks, we first analysis the source of interference for high power base stations and low power...
In this paper a simplification method of TSV interposer for thermal analysis was proposed. In order to analyze the accuracy of this simplification method, the actual model and corresponding equivalent model with 100 TSVs were established by using ANSYS Workbench software. In this study, the error of simplification method with various TSV diameters, TSV pitches have been determined. Conclusions are...
To guarantee the heat reliability of electronic devices, heat analysis is absolutely necessary hence the success of thermal design becomes the key to the physical design of the equipment. In this paper, a simplification method of solder joints based on mathematical derivation and heat transfer theory was proposed. In added underfill and without underfill both cases, with different diameter and solder...
Wireless sensor networks (WSNs) always collect an enormous amount of rich diverse environmental information. When WSNs grow large in scale, it is difficult for the sink to gather data due to the increasing transmission overhead. In order to improve the fidelity of data recovery and save energy, we propose a novel data aggregation and space-time global recovery scheme. The scheme exploits block Compressed...
It is important for sonar systems to distinguish the submerged source from the surface one. Current approaches based on matched field processing, mode scintillation and mode filtering require either precise knowledge of the ocean environment parameters or densely populated hydrophone arrays, and become problematic in practical use. Current waveguide invariant based method, deriving the distribution...
In this paper, the parameters of 750kV arrester are researched, and a MOA with series gaps for 750kV is designed. The electrical parameters of the arrester and gap are determined based on the simulation results of operation load and the energy absorption of MOA under the different conditions. Based on the simulation and calculation, the size of series is obtained. After that, the 750kV transmission...
This research studies robust uncoded video transmission over wireless fast fading channel, where only statistical channel state information (CSI) is available at the transmitter. We observe that increasing channel diversity for high priority (HP) data is essential to improving the robustness of video transmission in fading channels. By utilizing the noise and loss resilient nature of video, we find...
This paper presents a novel design of linear random space time coding (LRSTC) scheme. This scheme is able to achieve the dual benefits for MIMO receiver rate adaptation: (1) rateless coding and modulation and (2) approximately universal tradeoff between diversity gain and multiplexing gain. In this scheme, an LRSTC symbol is the superposition of a block of randomly rotated QPSK symbols. Such superposition...
This work refers to mobile video transmission at the physical layer. We develop a video communication system using transform-domain Wyner-Ziv video coding and rate compatible modulation. Because Wyner-Ziv video coding is employed, the encoder and transmitter of this system have low complexity and therefore are applicable to mobile devices. In addition, rate compatible modulation proves more efficient...
The major challenge in wireless multicast is the heterogeneous channel conditions of multiple users. In video multicast, the combination of a layered video coding scheme and a layered transmission scheme can gracefully accommodate user heterogeneity. This paper presents MixCast, a novel physical layer scheme for layered transmission. The key innovation in MixCast is the rateless Euclidean symbol mapping...
The research implication is the emphasis and difficulty in the study of logic. In the paper, the operations are redefined on the interval-set, which are interval-intersection, interval-union, interval-complement and interval-implication. Regularities and monotonicities of interval-implication are proved; interval-intersection and interval-implication are proved to be an adjoint pair; interval-implication...
This study collecting the monitoring data for surface water quality and economic development data of Tianjin, and analyzed the water quality according to national water environmental quality standards between 1998 and 2008, it is found that Hai River and other main rivers were polluted badly except Yuqiao Reservior which is only drinking source water body. In the past two decade, economy of Tianjin...
Water quality adjusting system of thermal power plant is a large time-delay and time-varying controlled object. The control quality of the Fuzzy immune adaptive control and conventional Smith control is not satisfied. In order to solve the time-delay and time-varying problem, a fuzzy immune adaptive Smith-PID controller is presented. The controller combines biological immune system and fuzzy inference...
This research considers network coded broadcast system with multi-rate transmission and dual queue stability constraints. Existing network coded broadcast systems consider single rate transmission without receiver queue constraints. First, we shall illustrate that broadcast without network coding cannot support maximum throughput in wireless fading channels. However, the network coded broadcast poses...
The emerging scalable video coding extension in H.264/AVC standard will enable the deployment of video streaming and distribution applications in heterogeneous environments, with different user bandwidth resources and display capacities. In this paper, we study the problem of how to distribute scalable coded media objects from a media distribution server in peer-to-peer based IPTV applications. All...
Peer-to-peer networks have been considered as a promising network model for bandwidth-intensive multimedia streaming applications. In this paper, we study the problem of how to distribute segments of a media object from a media distribution server in IPTV applications. We leverage peer-to-peer networks to reduce the pressure on the distribution server, and peers exchange media segments in every playback...
A modified MUSIC algorithm for DOA estimation was proposed in this paper. It weighted the eigenvectors in the noise subspace which decreased the proportion of the eigenvectors of the bigger eigenvalues and increased the proportion of the eigenvectors of the smaller eigenvalues. This method adjusted the specific gravity of the eigenvectors in the spatial spectrum, and it reduced the influence of subspace...
This paper presents a high speed low voltage differential signal (LVDS) interface circuit for CPU, LCD, FPGA and other fast links. In the proposed transmitter a stable reference and a common mode feedback circuit are applied into the LVDS drivers, which enable the transmitter to tolerate the variations of process, temperature and supply voltage. The proposed receiver implements a rail-to-rail amplifier...
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