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Articles by Zhang Jun
Total Records ( 5 ) for Zhang Jun
  Zhang Jun , Gao Lei and Zhang Deyun
  In order to solve the problem of real-time speech quality assessment, a high-performance algorithm, Efficient Psychoacoustics Evaluation of Speech Quality (EPESQ), based on psychoacoustics model, is proposed. The process of EPESQ is: The original and corresponding degraded speech samples are first preprocessed by overall gain compensation and IRS (Intermediate Reference System) filtering. Then both signals are transformed to their loudness presentation by a series of consecutive steps: windowed fast Fourier transform, frequency warping to Mel-scale and loudness mapping. The loudness presentations are compared in different time-frequency cell to get the differences called Disturbance. Disturbances are aggregated over time and frequency and then the result is processed by a cognitive formula to generate the final evaluation score. Experimental results show that EPESQ performs a 37.5% reduction in running time and 51.9% in memory occupation to the P.862 algorithm with only a 7.8% decrease in average correlation to listener opinions. EPESQ is a high-performance algorithm and suitable for real-time applications. It has been implemented in our Internet voice communication system as a self-evaluating component.
  Zhang Jun , Wei Wei and Zhang Yuan
  Longitudinal dynamic analysis for 20-groupage, 18t-axle-load high-speed wagons under the operation of service braking and emergency braking were investigated using longitudinal dynamics analysis system, which was based on air brake system emulation. According to the simulation results, the longitudinal impulsion was differentiated into two parts, which were “extrusion coupler force” and “impact coupler force”. Some advises were also put forward to reduce the longitudinal impulsion.
  Ma Lei , Zhang Qi , Jia Qi-Nan , Zhang Jun , Yi Qing-Qing and He Jian-Feng
  Liver diseases such as Hepatitis B has seriously affected humans’ health. According to the previous reports, gene mutation occurs as an essential factor of sustained infection. Technically, the detection of single nucleotide polymorphism loci can help study risk of infection and degree of disease evaluation. However, regular single nucleotide polymorphism selection methods such as Single-strand conformation polymorphism and Denaturing gradient gel electrophoresis are restricted by time consuming, technical difficulty and high costing. In this study, a computing method based on optimal risk and preventive pattern algorithm is applied to analyze the genetic mutation from perspective of SNPs in Hepatitis B virus Deoxyribonucleic acid sequence which illustrates the characteristics of low costing and simplified operation process. Moreover the proposed method may uncover specific unknown single nucleotide polymorphism loci from Hepatitis B virus gene sequence data. The experiment releases 18 potential single nucleotide polymorphisms locus that demonstrate the transition from Acute to Chronic, where five of them have been reported in previous research, the remaining 13 are potential locus. In addition, 3 potential single nucleotide polymorphisms locus that demonstrated the transition to Cirrhosis are discovered. It may provide valuable reference for the clinic prevention and diagnostics.
  Zhang Jun and Gao Lei
  Without detailed knowledge of the network topology between Network Security Audit System (NSAS) and the end system, NSAS may be unable to determine whether a given packet will even be seen by the end system. Finite state machine detection model based on adaptive TTL neuron is proposed to solve it in this paper. By inspecting the variance of Time To Live (TTL) field in ingress sequence, the adaptive TTL neuron compares the TTL field of new fragment with the average to detect whether the TTL field of new fragment is normal or not. Combining the TTL neuron with the detection state node of finite state machine detection model, ingress flow will be benign and NSAS won`t be confused anymore.
  Zhang Jun and Duan Ya-Hui
  Cracks are often found at lining concrete of flood discharging tunnel during construction. Previous studies have shown that temperature stress is the main cause leading to cracks during construction. The cooling pipes method is one of the important measures to control temperature. The equivalent heat conduction Finite Element Method (FEM), because of its simple, is usually applied to simualte the temperature field. The FEM with cooling pipes which can simulate the temperature field accurately has rarely been reported. For this reason, the lining concrete of Xiluodu underground engineering flood discharging tunnel Longluowei section is simulated by FEM with cooling pipes. Good simulated results are obtained comparing with the experimental data and some very useful conclusions can be applied for site analysis to prevent cracks.
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