Abstract:With the proliferation of video traffic across the Internet and wireless networks, various compression standards for videos have emerged over the past two decades. Among them, Motion Joint Photographic Expects Group (M-JPEG) offers the advantages of no frame-to-frame error propagation, less computation cost, and achieving a short latency in both encoding and decoding. However, the bit-rate of M-JPEG stream is variable due to its dynamic frame size, and that leads to adverse outcomes such as inducing different quality-of-service (QoS) grades from servers and networks and inducing disturbances in a real-time network environment. This paper proposes a novel approach that can control bit-rate and also the individual frame size of M-JPEG video stream in real-time. Experimental results are provided to show that the proposed approach is amenable to direct, straightforward implementation and yet outperforms similar existing approaches in regulating the bit-rate and the frame size of M-JPEG streams.

Abstract:According to the practical problems in eddy current sorting, the method and technology of eddy current hardness sorting based on Least Squares Support Vector Machine (LS-SVM) are proposed based on the Xilinx Artix-7 FPGA in this paper. The calculated sort-ing-hyperplane and designed sorting decision-making machine were used to sort different hardness of the vavles. The experimental results of the vavle sorting show that the sorting success rate can reach 100% under conditions that the number of test vavles is one quarter of the training vavles. The method and technology based on LS-SVM can solve the problems that the impedance feature value is nonlinear with the hardness value and variable sorting interval. It also proved that the LS-SVM algorithm has strong practical value in online eddy current sorting.

Abstract:The atomic time scale release system for multiple laboratories is completed by modular design according to the atomic clock data provided by eight domestic punctual laboratories. The system includes the three modules, the processing of atomic clock data, the calculation of atomic time scale and the release of atomic time scale data, using MATLAB for data processing and time scale calculation, and using GUI for data visualization design. The system has clear process of the algorithm, simple function modules and friendly human-machine interface. The operation results of actual data show that the time difference between the integrated atomic time scale of the system and UTC is better than ±10ns, and the content of data release can meet the needs of the scientific research in related fields in China.

Abstract:With the rapid development of internet technology, some innovative fashion product are increasingly showed in the way of three-dimensional virtual display. Taking fashion jewelry as an example, the virtual 3D display method of product is studied by Inventor which is parametric 3D design software for efficient modeling and animation developed by the Autodesk Company. By discussing the methods of part feature creation and assembly design, the real simulation of the product is carried out. Three-dimensional animation techniques, such as fade animation, components animation and camera animation are used to depict product features and animation effects.

Abstract:The perimeter intrusion detection system is critical to China's railway safety. An efficient intrusion detection system can effectively avoid human casualties and property damage. This article makes a comprehensive comparison of popular detection systems in recent years. It first outlines the characteristics and classification of intrusion detection systems, and then introduces the relevant literature of contact and non-contact systems according to different types, and also introduces the principles and architecture of the models they use in detail. Finally, the detection performance and suitable environment under different system models are analyzed by comparison.

Abstract:Clinical examination data often have the features of carrying vague information, missing data and incomplete examination records, which lead to higher probabilities of misdiagnosis. A variational recursive-discriminant joint model with fast weights (FWs) scheme is proposed. MIMIC-III data sets are trained and tested, and the results are used to diagnosing. Variational recurrent neural network (VRNN) with FWs can better obtain the temporal features with partly missing data, and discriminant neural network (DNN) is for decision. Moreover, layer regularization (LN) avoids the overflow of loss function and stabilize the dynamic parameters of each layer. For the simulations, 10 laboratory tests were selected to predict 10 diseases, 1600 samples and 400 samples were used for training and testing, respectively. The test accuracy of disease diagnosis without FWs is 72.55%, and that with FWs is 85.80%. Simulations reveal that the FWs mechanism can effectively optimize the system model, abstracting the features for diagnose, and significantly improve the accuracy of decision-making.

Abstract:X-ray is an important tool for charactering and analyzing materials. However, current X-ray generation is cost with low efficiency. For X-ray tube, which is mostly used in laboratories, only has an energy usage of 1% with all other energy dissipated into tremendous heats, and it needs continuous cool water flows to cool down the cathode. It generates X-ray by the bremsstrahlung of high energy electrons bombarding on the cathode target, the bremsstrahlung would contain X-ray with sufficiently high energy of the electrons. But most part of the electron energy becomes heats. In order to generate X-ray more cheaply with higher efficiency, methods about reusing the released heats during the working of the X-ray tube are brought up. Mimicking the photovoltaic effect, nonequilibrium carriers could also be injected via thermion emission when heating a metal, such injection is same to that of photonic injection which produces electromotive in a photovoltaic cell. In a photovoltaic cell the electron-hole pair generated by incident photons are nonequilibrium carriers that causes electromotive, while the thermion emission creates such electron-hole pairs via thermal excitation. Connecting metals suitable for thermion emission from the cathode into the p-n junction so that thermions as nonequilibrium carriers can be well injected into the p-n junction when the metals are heated by the cathode, with Thomson effect which enhances such injection, a thermal voltaic cell can be constructed and it can produce electricity only by heating the metals outside. Applying such thermal voltaic cell into current X-ray tube, it would produce electricity while absorbing the tremendous heats emerges when X-ray tube is working. Water flows are still used to control the temperature, but letting them boiling to keep the cathode at a temperature best for thermal voltaic cell, and the vapor may be used to drive a mini thermal power plant. In this way, the energy usage could be modified to a higher proportion. Stepwise up-conversion is possible to generate X-ray more cheaply but there are no suitable materials so far.

Abstract:Power consumption is a vital issue for communication systems, especially for those which powered by batteries. In wireless com-munication system, the power consumption of PA (power amplifier) consumes a large portion of power compared with another component. How to reduce the power consumption of PA is always one of the big topics in the R&D and application of PA. Modern communication systems which have the high Peak to Average Power Ratio (PAPR). Envelope tracking technology can effectively reduce the power consumption of PA, especially for the high PAPR system. In the meantime, ET does not affect the performance of PA and communication system. This paper introduces the principle of ET, and gives the test method of ET performance. An ET test system has been built using R&S SMW 200A vector signal generator and FSW vector signal analyzer. The measurement result shows 20% of power saving by the application of ET.