Showing papers in "Journal of Harbin University of Science and Technology in 2008"

Numerical Analysis of the Plasma Characteristics of Pulsed Discharge in Water

Abstract: Channel characteristics of the cylindrical geometry of the plasma pulsed discharge were described by conservation equations of energy,momentum and mass.The 4th-order Rounge-Kutta method was employed to solve for the time-variation responses such as the current,the temperature,the channel radius and the particle density and pressure,and also interrelationship between them.The purpose of this paper was to provide the reference for further studying the chemical and physical effects of the pulsed discharge plasma.

A New Shortest-path Algorithm Based on Dijkstra

Abstract: This paper introduces the classical algorithm of Dijkstra,and its limitation.The paper emphasizes an optimization of shortest-paths-the algorithm of priority queue,when searching the smallest nodes.The time complexity of the algorithm is reduced significantly.

Application of Wavelet Analysis and Hilbert Analysis to Rolling Bearing Fault Diagnosis

Abstract: In allusion to the nonstationarity and modulation feature of rolling bearing fault signals,this paper describes a method based on wavelet.It can decompose testing signals,and reconstruct the characteristic ones to obtain the fault signals.Also using Hilbert transform and time/frequency-domain bearing vibration analysis it presents an approach to get the frequency of fault signals.So you can estimate what kind of the fault mode is.And through the matlab emulator it indicated the wavelet combined with Hilbert transform can be effective agents in the diagnosis of various rolling bearing faults.

Realization of Tele-acquisition in LabVIEW

Abstract: Through the network for remote instrument control and measurement data network remote monitoring is the key technology.In this paper the use of LabVIEW virtual instrument development platform for remote monitoring and control methods with self-made embedded USB interface data acquisition card is realized.Acquisition card takes ARM7 as MCU through A/D conversion,calling USB firmware and sending sampling data to USB bus with LabVIEW developed using PC interface and published on the Web,the client browser can monitor the remote data.Debugging success of the whole system can be used as remote data acquisition and monitoring.

The Design and Realization of Paper Currency Recognition System

Abstract: We introduce a kind of paper currency recognition system and the way of recognitionWe combine CPLD and CIS with the technology of DSP,which is based on the design of hardware;we apply the method of picture processing technique and modified SOFM nerve network to recognize paper currencyThe experiment reveals that this method achieves a high recognition rate and fast recognition speedThe proposed method has been applied to a practical sorting system

Motion Analysis and Simulation of Three-axis WEDM System

Abstract: The characteristics and general laws of cutting complex curved surface by WEDM system are studied.Based on analysis of motion parameters and motion types of three-axle and single-rotating WEDM system,the mathematical models are derived.Moreover,the simulation of WEDM system is introduced,which utilizing language Visual C++6.0 and the three dimensional graph software OpenGL.standard connection realization system.So,this article hand out a integrated method of studying on the processing of the complex curved surface.

The Application of Wavelet Transform and Regression Analysis Used in Short-term Power Load Forecasting

Abstract: In this paper,the wavelet transform(WT),based on Multi-resolution Analysis(MRA) is applied to decompose short-term power load into wavelet component.By the WT,the different load sequence components are projects to the different scales.According the different character of the load components,the different regression analysis method is used for forecasting.The forecast results are obtained by adding up all the forecast components.The results show this method is Better in obtaining farecast.

A New Training Algorithm for RBF Neural Network Based on ACO

Abstract: To settle the problem that the cluster results of k-meanclustering Radial Basis Function(RBF) was easy to be influenced by selection of initial characters and converge to local minimum,Ant Colony Optimization for the RBF neural networks and a model based on this method were presented in this paper.Compared with k-mean clustering RBF Algorithm,the result demonstrates that the accuracy of Ant Colony Optimization for the Radial Basis Function(RBF) neural networks is higher,and the extent of fitting has been improved.

A Novel Image Denoising Method Based on Curvelet Transform

Abstract: A novel image denoising algorithm is proposed,which utilizes curvelet transform combining with cycle spinning.It avoids image artifacts due to the lack of translation invariance of curvelet transform.The experimental results show that the proposed curvelet reconstructions method yields denoised images with higher PSNR and better perceptual quality than the ones denoised by classical wavelet transform.

Research of OPC Technology in the Field of Industrial Control

Abstract: This paper introduces OPC(OLE for Process Control) technology,which is a booming industrial control studied.An emulation system of semi-physical has been developed according to OPC Specification.The results show that the control system's open performance,repetition of protocol conversion and incompatibility of integration between different software systems,etc.have been greatly improved.

A Measuring Method of Rice Whiteness

Abstract: A way to detect the rice whiteness was applied based on the tristimulus values for appraising rice surface colour information roundly.Appraising rice synthetically based on using the theory of tristimulus values to gain whiteness and colour information of rice.The method can not only mensurate the rice whiteness exactly,but also calculate the L*、a*、 b* colour parameter,the rice chromatism will be calculated when the rice whiteness is detected.The results indicate the method appraises rice colour and luster objectively,distinguishing quality well and truly.

Application of Finite State Machine in Single Chip Microcomputer Programming

Abstract: In order to enhance the timely processing ability to the complex-duty by Single Chip Microcomputer,we use the finite state machine in our programmingUsing the finite state machine smoothly may reduce the judgment step and time,so do processing timelyBy this way,every state can be mutually independent,so we can realize the modular programming and the procedure reads and revises easily

The Design and Implementation of IVR System Based on Component

Abstract: Because of the lack of flexibility in traditional IVR System of Call Center,the problems such as repeating exploitation and increase of cost have appeared.For resolving of the problem,the paper shows a framework of the IVR System of Call Center based on component technique by using C++language as exploiting tool,and gives the analysis and design of the components.

The ESB-based Supply Chain Knowledge Management System Architecture

Abstract: The supply chain knowledge management system is essential for supporting knowledge sharing,knowledge utility and knowledge innovation between member enterprises.Firstly the requirements for the supply chain knowledge management system are analyzed.Then the information technologies that can meet these requirements are discussed.On this basis the architecture for an ESB-based supply chain knowledge management system is proposed and described in detail.

Studies on Properties of Immobilized Cellulase on a Carrier

Abstract: PEG-CS(chitosan modified by polyethylene glycol) was prepared and applied to immobilize cellulase.The immobilization conditions and properties of the immobilized enzyme on PEG-CS were studied.The immobilized enzyme exhibits the maximal activity at pH 4.0.The optimal temperature of immobilized enzyme is at 60℃,higher than free cellulase.In acetic acid-sodium-acetate buffer(pH 5.0,40℃),the Km for CMCNa of immobilized cellulase and free cellulase are separately 7.2mg/L and 3.3mg/L,so the affinity of cellulase decreases after being immobilized.The thermal-,operational-,and storage-stabilities of the immobilized enzyme are obviously increased compared to those of the free one.

The Research of Database Encryption Based on Hybrid Cipher System

Abstract: To solve the problem,how to protect the security of Database system and the security,integrality and validity of Data,by researching both of the algorithm,asymmetric algorithm(RSA) and symmetric algorithm(Triple_DES) of database encryption,we bring forward one kind of mixed encryption algorithm.Furthermore,by testing this algorithm,we find that the algorithm can effectively resolve the problems such as encryption and key transmission,that the algorithm has high secrecy intensity and the algorithm's operation efficiency matches the symmetry algorithm.

Design of Diode Laser Stable Output's Control System

Abstract: High-stability output's system of diode laser is introduced.The system is based on the MCU of MSP430 according to the characteristic of diode laser,which is composed of stable current sourse,temperature control system,light power feedback system and so on.It can protect and control the diode at the real time,show and set the output's power.The software of slow starting up,slow closing and the protecting relay are adopted.The power stability can be up to 0.12%.

Theoretical Study on the Conductive Property of Polythiophene

Abstract: The relationship between the structures and the conductivities of oligothiophenes has been theoretically investigated using density functional theory(DFT) as implemented in Gaussian 03 program.The geometry structures of the undoped(nT,n=1/2,1,3/2,2,5/2,3) and doped oligothiophenes(nT+,n=1/2,1,3/2,2,5/2,3)(from one to six rings) are fully optimized at the B3LYP/6-31+G(d) levels.By the analysis of the geometry structure,the frontier orbital levels,and the excitation energy,it is found that the conductivity increases with the chain length increases,while,the conductivity may no longer increase when the chain comes to a certain length;The charge-doping could introduce a polaron level between the HOMO and LUMO levels,which results in a narrower frontier orbital energy gap,lower excitation energy,and smaller bond length alternation parameter comparing to the undoped system.This is the main conducting mechanism of polythiophene different from thoes of metals and inorganic semiconductors.

Speaker Recognition Using Kernel K-mean Clustering and SVM

Abstract: We proposed a novel approach that is based on the kernel K-means clustering and support vector machine(SVM),set up a support vector machine for each two speakers,here kernel K-means clustering is exploited to input speech signal of SVM into a given amount of clusters choosing the effective samples as the input of SVM.In this paper,we proposed approach acquiring the effective of clustering and reduction of speech data,and it greatly improved recognition rate.The experimental results show the proposed approach performances are better than tradition approaches in the SVM as classier.

The Design and Simulation of LC Elliptic Band-pass Filter

Abstract: Through all kinds of filters,the elliptic ones have particular advantages,but their design processes are more complicatedThis thesis makes use of an easy calculation method with sample designing steps,low computational complexity and needing less original value dataPSPICE simulation soft ware is used to design and simulate elliptic low-pass,high-pass and band-pass filters,and the simulation results show the effectiveness of the scheme

Study on Potassium Titanate Whiskers Reinforced Polyamide

Abstract: Potassium titanate whiskers(PTW) were modified with several coupling agents in order to advance the PA matrix.Properties of potassium titanate whiskers modified PA Plastics were investigated.Surface treatment of whiskers by coupling agents such as silane and titanate were used to improve the interface properties between whiskers and Plastics.And the effects of PTW on the mechanical properties and processabilities of PA Plastics were studied too.It is concluded that silanecoupling agents have better surface treatment effects than titanate coupling agent and untreated whiskers.The results show that PTW can be perfectly combined with KH550 and then excellently reinforced the PA matrix.

Key Technologies of High-power IGBT Inverted Air Plasma Cutting Power Supply

Abstract: The paper analyzes and designs the main circuit of high-power IGBT inverted air plasma cutting power supply.It also discusses such key technologies as external characteristics of power drive circuit,inverter structure and medium frequency transformer,and presents corresponding design plan to improve efficiency,to reduce volume of whole machine,and to enhance power reliability.As a result,the power improves the whole performance and it can satisfy high-power requirement of 160 Amp.cutting current and 150 Volt cutting voltage.The result shows that this plan is reasonable and effective to satisfy cutting process requirements.

Design on Monitoring and Controlling Simulation for Supply Chain

Abstract: This paper is based on the Supply Chain Operation Reference Model,(SCOR),proposed by Supply Chain Council(SCC).A monitoring and controlling system was designed based on the concept of order-to-produce and the supply chain operation was described,validated and monitored using IDEF0 and Petri nets.A corresponding dynamic supply chain simulation system was also developed.

The Development of Expert System Shell Based on CLIPS Core

Abstract: This paper proposes and establishes an expert system shell for helping domain experts to use CLIPS core.The shell program implements a fuzzy reasoning and explaining function for general purpose,while the knowledge-base could be established by domain experts themselves.This paper also designs and implements a knowledge acquisition scheme based on a dictionary with Chinese words,and explains the operation process of the system using a fracture-resetting robot as an example.

Realization of the Driver on Embeded Wireless Network Card and Solution of the Deadlock

Abstract: The paper introduced the method and skill for designing the driver of the USB wireless network card and also loaded the wireless network card driver on the embedded platform.Meanwhile,by analysising the problem of the hot-plugging,the paper solved the deadlock problem in the hub.c function belonged to the USB driver,and finally made the the Wireless Network Card normally hot plug on the embedded platform.

Numerical Simulation of Oil Film State of Large Size Ellipse Hydrostatic Bearing

Abstract: In order to solve lubricating problems of large size Hydrostatic thrust bearing in the heavy equipment,the three dimensional numerical modeling and boundary condition of hydrostatic bearing 3-D flow has been built in this paper.The model equations are solved by the Finite Volume Method and select segregated solver of FLUENT according to CFD(Computational Fluid Dynamic)principle.The velocities of flow and pressure distribution inside large size hydrostatic bearing are obtained.It can simulate lubricating characteristics of hydrostatic bearing in the different working conditions;it also can be used to forecast lubricating characteristics of large size hydrostatic bearing.The results are helpful for design and run security of hydrostatic bearing.

Research on Parts Recognition Application Using Wavelet and BP Neural Network

Abstract: According to the disadvantage of speed and precision in parts recognition system,this paper put forward a new parts recognition technology based on wavelet and BP neural network,which adopts wavelet multiscale edge detection technology,combined with recognition system based on BP neural networks.The experimental results prove that this method can not only improve veracity but also antinoise ability.

Image compression Based on Wavelet Threshold

Abstract: In this paper we accomplished an image compression method based on wavelet threshold,and analysed Haar wavelet's application in image compression,aecomposed the image firstly,then reconstructed it.Through set different threshold values and adopted Haar wavelet,we achieved a good result which compared image compression method adopted directly Haar wavelet or sym5 wavelet.Experiment results demonstrate the new method can improve the compression ratio and PNSR.By wavelet toolbox some simple image impression,we must improve some methods that have been in order to achieve better results.

The Torque Ripple Minimization and Dynamic Simulation of Brushless DC Motor

Abstract: According to torque ripple of brushless DC motor,in the paper,the different PWM modulation mode and overlapping commutation method is used to minimize torque pulsation when current commutation is considered.The Matlab/simulink is used to simulate this control system,the result shows that the limitation of commutation torque ripple is obvious,so these methods can minimize the torque ripple successfully.

Research on Petri Net Based Genetic Algorithm in Job-Shop Scheduling Problem

Abstract: In this paper,an extended timed Petri Net(ETPN) based partheno genetic algorithm was presented,which was used to solve the Job-Shop Scheduling problem.At first,we defined an extended timed Petri net,which was used to model the Job-Shop Scheduling problem,and then the Petri net model was optimized by a partheno genetic algorithm.At last,the effectives and validity of the modeling and optimization method was proved by the experiment given in this paper.