bluuebunny/crossref_metadata_2025 huggingface dataset:
A Multi-Objective Optimization Model for Plastic Cup Design Using Mechanical and Environmental Performances
Authors: Rosyidi Cucuk Nur , Aisyati Azizah , Kusumaningrum Anggun Tri
Published: August 2013

In recent years, environmental issues such as global warming and ozone depletion become more intense. The issues have made many companies include the environmental performances into their product life cycle from design into disposal stage. In the design stage, it is important to determine the optimal dimensions of the product which balancing the mechanical and environmental performances. The aim of this research is to develop a multi-objective optimization model for plastic cup design using mechanical and environmental performances. A case study is given to show the implementation of the model. The optimization model resulted a thickness which is not significantly different comparing to the current practice in the company. The results give more efficient use of material and reduction of production cost and environmental impact.
Analysis and Improvement of the Mass Sensitivity for Piezoelectric Immunosensor
Authors: Chen Yan , Huang Xian He , Shi Hua Shan , Chen Hong
Published: August 2013

The objective of this study was to improve the low repeatability in quartz crystal microbalance (QCM) measurements. The constitutive equations for the thickness-shear vibrations of an AT-cut quartz crystal with surface electrodes were used to obtain the particle vibration displacement amplitude equation. Then the mass sensitivity of piezoelectric immunosensor was analyzed and the approach to improve low repeatability was proposed. A 10MHz modified-electrode AT-cut QCM with a maximum mass sensitivity of was designed to verify uniform mass sensitivity distribution in the fully electrode region. Analysis results show that in order to improve the accuracy in QCM immunosensor measurements, it is feasible to improve its mass sensitivity.
Theoretical Analysis of Multiple Impact of Three Balls System
Authors: Fan Yong Li , Qiao Jin Li , Liu Kun , Li Yan Yan , Kong Dan Dan , Zhang Yan Ping
Published: August 2013

An effective theoretical method is developed to analyze three-ball system at contact in a bidimensional case basing on the impact law. The accurate solutions of the post-velocity have been computed in the paper. With the increase of between BallII and Ball III, the post-velocity of Ball III will be less and less. In fact, in the case of , the three-ball system in the same plane is consistent with the three-ball system in co-linear, when , the impact is happened only between BallI and Ball II. It is proved that the vibrating frequency influences only the impact time and the displacement of each ball for the three-ball system in the plane with elastic impact, but can not affect the momentum transfer and the post-velocities of the three balls, and all possible rigid solutions for impact are the limits of the theoretical results in some parameters of the system actually.
Frequency Response of Carbon Nanotube Probes during Tapping Mode of Atomic Force Microscopy
Authors: Shih Po Jen , Cai Shang Hao
Published: August 2013

The dynamic behaviors of carbon nanotube probes applied in Atomic Force Microscope measurement are of interest in advanced nanoscalar topography. In this paper, we developed the characteristic equations and applied the model analysis to solve the eigenvalues of the microcantilever and the carbon nanotube. The eigenvalues were then used in the tapping mode system to predict the frequency responses against the tip-sample separations. It was found that the frequency drop steeply if the separation was less than certain distances. This instability of frequency is deduced from the jump of microcantilever or the jump of the carbon nanotube. Various lengths and binding angles of the carbon nanotube were considered, and the results indicated that the binding angle dominated the frequency responses and jumps.
Design of Curved Patch Array Antenna for Small Missile Application
Authors: Monthasuwan Jessada , Thosdeekoraphat Thanaset , Thongsopa Chanchai
Published: August 2013

The design of curved patch array antenna for small missile application is presented. A thin copper plate antenna was attached a part of plastic pipe. This antenna is designed on cylinder metal object for such an application in military communication devices and antenna analysis was conducted by using the CST program. The frequency of a designed antenna was adjusted at 2.4 GHz. The proposed antenna is realized and experimentally examined, since it is small size, light weight, easy method fabrication and low manufacturing cost. In measurement, it is found that the propose antenna have the return loss was lower than-10 dB which covered frequency range 2.3 GHz-2.7 GHz. The average gain achieved in the propose antenna is about 6.13 dB over the operating frequency. The advantage of the proposed antenna is that it can be used to small missile for military application.
Degradation Model Prediction for Battery of Electric Vehicle Based on Hidden Markov Model
Authors: Yu Gang , Sheng Lu Ying , Guo Mi Mi
Published: August 2013

This paper proposed a new method based on hidden Markov model (HMM) to distinguish the degradation mode of the battery of electric vehicle. In the process of describing the degradation process of battery of electric vehicle, degradation models under dynamic running conditions need to be analyzed in order to effectively forecast the remaining useful mileage and life of battery. First, the paper performs cluster analysis of the batterys charge and discharge curves to find out the degradation mode of the battery. Then HMM is applied to research the dynamic changes of the degradation mode and predict future degradation mode sequences. Finally, experimental analysis based on batterys charge and discharge data from NASA proves the effectiveness of the proposed approach.
The Design of Information System Vulnerability Management Software Based on CVSS
Authors: Huang Bo
Published: August 2013

The purpose of information system vulnerability analysis is to find loophole and to prevent endangering the information system security. Based on principles of information security risk assessment and Common Vulnerability Scoring System (CVSS), this paper presents a system model for information system vulnerability management. The function models are analyzed respectively; the technology features are also summarized in this paper.
FEM Study of Thermal Stress Field of Wheel under Typical Braking Condition
Authors: Wang Ping , Li Wei , Chen Wen , Wang Dong Ming
Published: August 2013

Based on actual load conditions, the transient temperature field and thermal stress field of rail wheel under the conditions of service braking, emergency braking and ramp braking are calculated by means of the finite element theory. As a result, the inner side of web hole is in a prolonged condition of tensile stress, while the outside of web hole is in the condition of compressive stress, where the value of tensile stress is maximal under ramp braking. Furthermore, the value of thermal stress for worn 20mm wheel is obviously higher than that for non-worn wheel.
On the Wireless Network Curriculum Teaching
Authors: Ma Jin Jin , Jin Guang , Jiang Xian Liang , Huang Lu Juan , He Xian Mang
Published: August 2013

Wireless network technology has developed rapidly and been widely used in different forms, such as Wireless LAN (WLAN), Wireless Sensor Network (WSN) and the 3G Mobile Communications. As one core curriculum of IT major, the computer network curriculum mainly focuses on the wired networks rather than the wireless networks and is hard to meet the needs of IT industry. In this paper, we firstly survey the current teaching of wireless network techniques and then discuss the necessity of the wireless network curriculums. By improving teaching contents and methods, we put forward a novel wireless network teaching mode using simulation tools.
An Intelligent System for Weave Structure Design Based on Genetic Algorithm
Authors: Lin Jeng Jong
Published: August 2013

An intelligent design system, which can generate a variety of patterns for a designer to evaluate each of them and scoring them by preference, is of great value to be created and developed by using genetic algorithm in this study. Through the assistance of the GA-based intelligent system, a fabric designer can proceed with the design process in a more flexible and effective way to obtain innovative weave structure. The problem of running out of creative inspiration for a designer can thus be eliminated.
Development of that Health-Related Fitness Management System for Civil Servants that Based on Web
Authors: Wang Bin , Luo Shi , Ma Hong Yu , Liu San Ming , Jiang Tian You
Published: August 2013

Civil servants of the state, working in the government institutions of various levels and executing the mission of state administrative functions and powers. It is true that civil servants need to own healthy physique (i.e. physical, psychological and social adaptation) to guarantee them competent in the posts. However, the properties and characteristics of civil servants work lead to their health-related fitness problems. This paper addresses the computer science and psychology integrated into the psychological health education and tries to explore and study the features of civil servants health. According to the needs of physical health construction of civil servants, we develop health evaluation system for civil servants. This article introduces this system in terms of the general structure of system overview, system modules classification and characteristics of the system. The system using asp.net, SQL Server software to complete the civil servants' physical health evaluation system so as to realize the civil servants' health-related fitness of the measurement of computerized. This testing system can be directly connected to the database and the test result confirms that this is a set of standardized, easy-expand applying psychological evaluation system.
Application of Motion Capture Instruments in Modern Sports
Authors: Luo Qi
Published: August 2013

Motion capture system is a kind of high technology equipment that is used for measuring accurately the motion condition of moving objects in 3D space. Based on the principle of computer graphics (sensor), it record the motion condition of moving objects (tracker) in the form of image through a few video capture device (sensor) arranged in the space, and then make use of computer to deal with the image data, getting space coordinates (X, Y, Z) of unit of different objects (tracker) on different time.The paper elaborates the concept, classification and characteristics of Motion Capture System, and the roles this system played in sports as well as the typical application in sports projects. It is believed that Motion Capture System will be widely applied in the sports fields in order to give better service to the development of sports in our country.
NURBS Curve Interpolation Algorithm Based on Motion Axis Control
Authors: Tang Liang Bao , Li Shuai Shuai , Liu Yan Qing
Published: August 2013

This paper based on the interpolation point check calculation process, which uses the movement aixs of the CNC system on the velocity and acceleration components checking , instead of the traditional motion characteristics of the checking calculation. In this way, we can avoid complex NURBS curve derivative computation and simplify the process of the interpolation point calibration. Therefore, it also can ensure the precision of curve machining based on curve, at the same time, the interpolation speed and acceleration control strictly in the scope of the corresponding axis servo system capacity. Whats more, we can ensure that processing does not appear too large shock and vibration at any time.
Microfluidic Chip of X-Sperm and Y-Sperm Separation by Property and QCM
Authors: Cheng Chin Yuan , Chien Chao Heng
Published: August 2013

In this research, we try to extend the application of bio-chip that basic on our MEMS laboratory like sperm separation for IVF(In Vitro Fertilization). At the past research, many properties of sperm had been observed by academic. The difference between X-sperm and Y-sperm are not only DNA but also like speed of motilitymorphologyweightPH value.[1] Those properties all could be able to promote sperm separation and add to our design for bio-chip. Finally, the end of micro channel had made a DEP-QCM device that was our MEMS laboratory research achievement in the past year. The DEP-QCM device can trapped micro particles or cells and determined weight by the changes of frequency. On the other hand, we also used simulation software on PC to analysis the flow field and electric field for our design.
Research and Application of Vibratory Stress Relief (I) - Research on Vibratory Stress Relief (VSR) Supervisory System
Authors: Yang Cheng Hui
Published: August 2013

The VSR supervisory control software is developed by Visual Basic6.0 programming, and the process having explained each systematic functions module realization detailedly. First, the device principle of vibration stress relief system, the fundamental procedure and the fundamental parameter index of system designs have been introduced. And then, the supervisory control vibration stress relief device was developed, which has the intellectualized function. Monitor supporting device software are able to control the electric motor accurately, and real time acquisition value and frequency are carried out to the result analysis. Exploitation software can draw the penetrating vibration artwork clearly, which have improved the efficiency of vibration stress relief on a great degree.
Estimation of Torque Variation of Geohod Transmission with Hydraulic Drive
Authors: Aksenov Vladimir V. , Blaschuk Mikhail Yu. , Dubrovskii Mikhail V.
Published: August 2013

The features of initiation of irregularity of rotation in geohod transmission with hydraulic cylinders in different phases are discussed in the present study. The procedure for determination of torque variation, as well as the effect of transmission parameters on the value of variation is described
The Influence of Relative Distance between Ledges on the Stress-Strain State of the Rock at a Face
Authors: Aksenov Vladimir V. , Efremenkov A.B. , Begljakov V.Yu.
Published: August 2013

the effect of distance between ledges on the stresses in the rock of the face and distance between ledges as a function of the distance to the axis of a working are described, presence of a critical ratio of distance between ledges to the thickness of cut layer and the features characterizing the central area of the face are revealed.
The Influence of Magnetic Fields by a Melting Rate of Wire for Arc Surfacing under Flux
Authors: Nosov D.G. , Maltsev V.V.
Published: August 2013

As a result of the study the degree of influence of external magnetic fields on the efficiency of fusion surfacing wire for electric arc surfacing under flux conditions have been established regime for different combinations of basic and filler materials (ferromagnetic and nonmagnetic) at which the maximum growth rate of melting.
Wear Factors of Tillage Machines Working Tools
Authors: Eremeev A.V.
Published: August 2013

The paper provides brief classification of wear types of tillage machines working tools. Also factors influencing abrasive wear process are determined in the case of cultivator shank of Kuzbass 8.5 seeding machine. Principles of development of wear-resistant materials and coatings are discussed.
Improvement of Surface Layer Formation Technology for Articles Produced by Layer-by-Layer Laser Sintering
Authors: Saprykina N.A. , Saprykin A.A.
Published: August 2013

Mathematical relation between roughness of the surface layer of the sintered article and layer-by-layer laser sintering modes obtained from experiments conducted using copper powder material PMS-1. Authors suggest that split manufacturing process of an article and its inner part must be split to roughing, semi-finishing and finishing modes.
Bronze Sealing Rings Defects and Ways of its Elimination
Authors: Martyushev N.V. , Pashkov E.N.
Published: August 2013

In the article data about application nanopowder on a structure of coatings of the form are submitted at a casting of lead-tin bronzes. Elimination of gas porosity on a surface bronze cast preparations of high pressure compressors piston rings was the primary goal of such application protectively-dividing coverings. For experimental works mark of multicomponent bronze has been chosen. Its structure includes tin, lead, zinc and nickel. Casting from this bronze received a method of centrifugal molding. Influence of a structure of used protective - separating coating of a foundry core on a surface smoothness was probeed. Was compared action of coatings of a following composition: anti-burning-in coating (a blend of a low dispersible powder of chromium oxide with calcinated vegetable oil); anti-burning-in material ASPF-2/RgU (on the basis a low dispersible powder of graphite and the calcinated vegetable oil); the patent № 2297300 (blend of a ultradispersible powder of dioxide of zirconium with inpowderrial oil. Molding without use of coverings leads porosity depth to 4-5 mm and to a marriage significant amount (to 50 %). Use ASPF-2/RgU completely eliminates welding casting to a casting mold, but porosity on a surface remains. Application of coverings of a casting mold containing in quality of a filler ultradisperse powders oxide metals with low heat conductivity allows in to lower much a roughness and to eliminate gas porosity on a cast surface from lead-tin bronze. A gas time of a surface still remains, but them becomes much less and their form changes. Depth of defects doesn't exceed 1-1,5 mm that doesn't fall outside the limits the admission.
Tribotechnical Properties Lead Bronzes
Authors: Martyushev N.V. , Pashkov E.N.
Published: August 2013

In operation legitimacies structure shaping lead antifrictional bronzes gained are studied at various requirements of crystallisation by a modification of velocity of refrigeration of casting moulds. Influence of a microstructure of studied materials on them tribotechnical properties is explored. It is displayed that lowering of velocity of refrigeration lead bronzes leads to friction coefficient lowering. For multicomponent lead-tin bronzes, lowering of velocity of refrigeration lead bronzes leads to magnification of value of a friction coefficient and growth of mechanical properties.
An Improved Multi-Scale Morphological Undecimated Wavelet Method and its Application in Rolling Bearing Fault Feature Extraction
Authors: Chen Qiang Hua , Li Hong Ru , Xu Bao Hua
Published: August 2013

For the purpose of extract the fault feature hidden by strong noise background in rolling bearing fault signal, a morphological undecimated wavelet method was proposed. A undecimated wavelet decomposition operator called gradient filter was presented based on an open-closed and closed-open mixed filter. The morphological gradient filter was used to extract the impulse feature of signal. The type and the length of structure elements used in these filters were alterable adapt to the signal. The method was applied to analyze the simulated data and measured vibration signals from the bearing with fault. The results confirm that the proposed method is feasible in impulse feature extraction of signal, and it is more effective than other traditional morphological undecimated wavelet methods.
Methods of Phasor Algorithm Applied on Substation Short-Circuit Impedance Calculation Analysis
Authors: Teng Yun , Li Yong , Li Yan
Published: August 2013

Dynamic and real-time monitoring of substation, the analysis of the operating state of the substation through the phasor values of the substation. The phase of accurate measurement is a prerequisite to ensure accurate analysis Substation running state. This paper uses Fourier algorithm, recursive least squares algorithm and Kalman algorithm three methods of phasor calculation solving the acquisition voltage, current from the substation, get the results of calculation and error analysis. Come up with a more accurate method of phasor calculation. Provide a practical method for the accurate analysis of the operating state of the substation.
Research on Localization Principle and Method for Multistation Range-only Target Tracking System
Authors: Wang Lu , Liu Zhong
Published: August 2013

Observable condition for multistation range-only system was analyzed according to the characteristics of underwater target localization in the conditions of network warfare. When the target is stationary or travels in straight-line movement, it is able to be observed by range-only system. The target localization parameters are estimated by least squares estimator algorithm, which has simple form and does not need initial values. Simulation results show that the algorithm has fast convergence speed, good stability and high accuracy.
A Queuing Model for IEEE 802.11 DCF Performance Analysis
Authors: Chen Xuan , Xu Yu Bin , Ma Lin
Published: August 2013

A queuing model is proposed to analyze the performance of IEEE 802.11 Distributed Coordination Function (DCF). By regarding the network performance in the unsaturated case as the expected mean of the network performance in the different saturated cases, the proposed model extends the application scenarios from the saturated case to the nonsaturated case. The queuing model can be used to analyze the network performance and QoS parameters of the stations for different traffic conditions. In addition, this model also applies to the cases in shadow channels. Compared to the existing work based on the classic Markov model, the proposed model is more general and can be used in more complex and practical scenarios.
A Novel Disruption Operator in Particle Swarm Optimization
Authors: Ding Gui Yan , Liu Hao , He Xi Qin
Published: August 2013

Particle Swarm Optimization (PSO) has attracted many researchers attention to solve variant benchmark and real-world optimization problems because of its simplicity, effective performance and fast convergence. However, it suffers from premature convergence because of quickly losing diversity. To enhance its performance, this paper proposes a novel disruption strategy, originating from astrophysics, to shift the abilities between exploration and exploitation. The proposed Disruption PSO (DPSO) has been evaluated on a set of nonlinear benchmark functions and compared with other improved PSO. Comparison results confirm high performance of DPSO in solving various nonlinear functions.
Analysis of in Accident Influence Factors Based on Degree of Grey Correlational Model
Authors: Song Li Min , Men Yu Zhuo , Sun Yuan Yuan , Yin Ji Xin , Liu Xiao Lei
Published: August 2013

It is the problem how to search the main factors in various factors on accident. The gray correlation can not only improve the efficiency of the data which have existed, but also remedy the limitation of that carrying out systems analysis by mathematical statistics. From the overall perspective of human-machine-environment, accident prediction model is established and the influencing factors are analyzed of accidents in this paper. The grey correlation degree of the influencing factors is calculated. At last, prediction model of examples is examined. The result shows that the model is applicable and reliable in forecasting the main factors and the relations between them, thus providing reference for traffic administrative department to avoid traffic accidents.
Bayesian Network Structure Learning Based on Unconstrained Optimization and Genetic Algorithm
Authors: Lv Xiu Jian , Liu Rui Tao
Published: August 2013

Based on unconstrained optimization and genetic algorithm, this paper presents a constrained genetic algorithm (CGA) for learning Bayesian network structure. Firstly, an undirected graph is obtained by solving an unconstrained optimization problem. Then based on the undirected graph, the initial population is generated, and selection, crossover and mutation operators are used to learn Bayesian network structure. Since the space of generating the initial population is constituted by some candidate edges of the optimal Bayesian network, the initial population has good property. Compared with the methods which use genetic algorithm (GA) to learn Bayesian network structure directly, the proposed method is more efficiency.
Research in Evaluating Armored Vehicle Engine Using Condition Based on Similar System Theory
Authors: Zhang Hui Qi , Chen Chun Liang , Liu Jun Yan , Zhang Yong Qing
Published: August 2013

In order to forecast the using life of the armored vehicle engine synthetically, the index system of the armored vehicle engine using influence factors is established by means of the relativity analysis method, while the weightiness values of the indexes are calculated out by AHP. Taken as similar systems, different engine using environments are evaluated quantificationally in applying of the similar system theory and its measurement, and the actual consumable of motor hour for the engine under different using conditions is figured out defining the engine using condition correctional coefficient. As a result, the right weightiness matrix of the engine using influence factor indexes as well as the calculation method of evaluating the armored vehicle engine life under different using conditions is given. The feasibility and validity of the method is proved by the instance calculated.
Design and Kinematic Analysis of Reciprocating Cutters
Authors: Guo Yi , Li Zhi Qiang
Published: August 2013

[Purpos] in order to solve design problems of the cutter for the seedling vegetable harvester, a reciprocating cutter with a crank linkage mechanism has been designed. [Metho SolidWorks software has been adopted for virtual design of parts and assemblies of the reciprocating cutter for the seedling vegetable harvester. A mathematical model for kinematic analysis of the cutter taking a crank linkage mechanism as its transmission system has been built. Matlab is used for kinematic analysis on the double-crank linkage mechanism from aspects of displacement, velocity and acceleration of followers. [Result The cutter has been applied to the seedling vegetable harvester for the experimental purpose and turned out to operate reliably and produce uniform height and leveling shearing fracture. [Conclusion Results indicate that the cutter has been reasonably designed, which will provide theoretical and practical basis for related design.
A Fingers Vector Detection Method Based on K Vector and K-Medoids Clustering Algorithm
Authors: Duan Hong , Cai Kun Yu
Published: August 2013

This paper proposed a method of computing the hand direction vector. At first, using K-vector method, compute the K-slope of all the points on the contour to get a series of peak point sets; Then, cluster the sets which have been obtained through K-medoids algorithm; At last, detect the pointing direction of each fingertip from the clustering information, and get the hands direction by it. The experiment shows that the method achieves the precise positioning of hand direction in palm contours.
Multi-Objective Distribution of Multi-Helicopters and Track Planning
Authors: Xia Zheng Hong , Pan Wei Jun
Published: August 2013

The multi-objective distribution of multi-helicopter based on the feasibility matrix was proposed in this paper, which enhanced the effectiveness of aviation emergency rescue. The horizontal track planning of helicopters was put forward based on the morphology graphic process technology and heuristic A* search algorithm, which can obtain the feasible shortest flight path with the condition of safety separation.
The Integration and Development of NFC Technology and Mobile E-Commerce Payment
Authors: Peng Zhen Long , Huang You Lan
Published: August 2013

This paper discusses the developing situation of China mobile e-commerce, analyzes its development trends and bottleneck, analyzes the technical characteristics of NFC, and discusses the specific application and development trend of NFC in the mobile e-commerce payment.
Design of Device Driver in VxWorks
Authors: Zhang Cheng Hu , Peng Ren Ming
Published: August 2013

Introduce the principle and method of writing device drivers on the embedded real-time operating system VxWorks, and provides procedural framework.
A Solution to Improving the Performance of VVOIP Based on C-Native Android OS
Authors: Wang Hui Yang , You Xiang Dong , Pan Hao
Published: August 2013

VVOIP is an extended application from VOIP, and just because of the video function VVOIP is more complicated than VOIP, for video processing, video capturing, video codec and video transmission need more CPU processing power and net bandwidth. In this paper, a hardware codec solution is proposed to improve the performance of the VVOIP application based on Android OS. Video hardware codec can help decrease the load of mobile devices CPU, leaving users enjoying more applications at the same time. The hardware-codec VVOIPs performance of VGA-size is 15%-20% better than the unimproved one through the test result.
Mathematical Modeling and Robust Control for Beam Reheating Furnace
Authors: Hu Ling Yan , Hu Ling Yan
Published: August 2013

According to the large beam reheating furnace widely used in metallurgy area, the mathematical model was built basing on the heat transfer. Considering the uncertain and nonlinear characteristics existing in the system, the robust stabilization problem of the system is investigated basing on Lyapunov stability theory and linear matrix inequality (LMI) method. The robust controller is designed. A numerical example and its simulation results are given.
A Way to Realize Integration of Heterogeneous Wireless Networks in Smart Home
Authors: Ni Ye Peng , Miao Fang , Liu Jian Bo
Published: August 2013

In recent years, the ZigBee network has been rapid develop in smart home. In order to solve the intercommunication barrier in heterogeneous wireless networks in the smart home, a wireless home gateway which is based on embedded is designed and implemented in this paper. The gateway is made up of the main controller S3C2440, the ZigBee module JN5148 and the Wi-Fi module VT6656. It is capable of converting Wi-Fi protocol data or ZigBee protocol data, transmitting them to each other and integration of heterogeneous wireless networks. This paper describes the design and implementation process of the gateway hardware and software, introduces the Wi-Fi protocol data and the ZigBee protocol data conversion approach, and resolve the bottleneck caused by the two protocol different transmission rates. Then the performance of the gateway is tested, and the results indicate the Wi-FiZigBee gateway is completely meeting the needs of the smart home.
The Application of Ajax in the OA System Based on .NET
Authors: Chen Fu Jun
Published: August 2013

This thesis discusses the method and theory about Ajax. And describe the process and method of applying Ajax in web OA system based on .NET.
Graphics Development of Fractal Tree Based on E-Learning
Authors: You Fu Cheng , Wang Hao Chen
Published: August 2013

In computer graphic, conventional method often uses the fixed graphics in single color to introduce the design of fractal tree graphics, which makes students feel difficult to understand. In order to solve this problem, in this paper a new environment of fractal tree graphics base on E-learning is proposed, development of which is also introduced in detail. In this learning environment, the iterated depth of fractal tree graphics, and the changing angle of branch can be increased and decreased. In increasing process, the fractal limitation or fixed point can be seen clearly. In this new learning environment, students can easily grasp the fractal graphics definition and the programming procedure of fractal graphics, and understand the generation procedure and structure of fractal tree graphics. Therefore, it can arouse the students interests and attracts their attentions in the course of learning.
Tiered Adaptive Large-Scale Storage System with High Performance
Authors: Zhang Lei , Zhu Li Gu , Zeng Sai Feng
Published: August 2013

There are various calculations, transmission, and storage devices in terms of performance or reliability characteristics in great physical differences exist of large-scale cluster storage systems. Meanwhile, the actual traffic load data access for storage devices is also not uniform in space and time and there is a big difference. It is unrealistic and unwise if all the data stored on the high-performance devices. In order to resolve this problem effectively, we propose large-scale adaptive tiered storage system architecture in which structure can carry out effective monitoring access to the load and adapting allocation of storage resources based on the application environment. This can fulfill the full potential to the advantages of high-performance storage nodes to improve the performance of large-scale clustered storage systems.
Research on Data Security of Finance Software
Authors: Wang Li Nan
Published: August 2013

Financial software technology development, promoted an enterprise effectively "integrated management", but also led to new safety problems. Financial software data security is a people pay much attention to the problem, in order to ensure the financial software of data security, many countries and enterprises not hesitate investment is huge endowment, to computer hardware and software research and development, in order to ensure the safety of computer data information. In computerized accounting work, accounting data security is a very important issue, it directly influences the success or failure of computerized accounting work, by the vast number of financial software users close concern.
An Improved Block Cryptosystem Based on Iterating Delayed Chaotic Neural Networks
Authors: Zou Xin Guo
Published: August 2013

Recently, a large number of chaotic cryptosystems have been proposed, many of them fundamentally flawed by lack of robustness and security. In this paper, we point out the weakness of a very recent block cipher algorithm which is based on the chaotic Hopfield neural networks with time varying delay and give the improved scheme of it. We provide the chosen plaintext attack to recover the permuted plaintext string, and point out that the encryption speed is not fast enough. It is shown that the dependence on the key, but not on the plaintext, to generate binary sequences of iterating the chaotic map mechanism facilitates leakage of the information and vulnerable been attacked. Based on such a fact, we give the improved scheme to obtain higher security and faster speed.
Detection of Network Intrusion Signal in Deep Camouflage Based on Chaotic Synchronization
Authors: Zhang Cai Tian , Zhang Yi Bo
Published: August 2013

For detecting the network intrusion signal in deep camouflage precisely and effectively, a new detection method based chaotic synchronization is proposed in this paper. The Gaussian mixture model of the network data combined with expectation maximization algorithm is established firstly for the afterwards detection, the chaotic synchronization concept is proposed to detect the intrusion signals. According to the simulation result, the new method which this paper proposed shows good performance of detection the intrusion signals. The detection ROC is plotted for the chaotic synchronization detection method and traditional ARMA method, and it shows that the detection performance of the chaotic synchronization algorithm is much better than the traditional ARMA detection method. It shows good application prospect of the new method in the network intrusion signal detection.
Research of Role-Mapping Associate Conflict Detection Methods
Authors: Tang Guang Yi , Wang Hong Feng , Cui Li Jie
Published: August 2013

nteroperable role-based access control model (IRBAC 2000) has solved inter-domains authentication access through role-mapping, but it may appear related conflicts in the process of role-mapping and then posing a security risk. This study introduces the conflict detection mechanism on the inter-domain of Role-Mapping process, and it is effectively and quickly detected the associated conflicts, and gives the detection algorithm and experimental verification, to improve the inter-domain security interoperable.
Application of Virtools in Virtual Campus Roaming
Authors: Zeng Min
Published: August 2013

In the campus roaming, 3D scene is modeled using the 3ds Max .After the completion of texture, baking, output and other related operations, System is designed and developed using virtools. The 3D modeling and interactive function of campus was introduced, and the system optimization and other related techniques are discussed. Taking Chengdu Polytechnic as an example, the design of a real-time interactive 3D virtual campus is completed.
Fuzzy Amendments of Trust Model with Intrusion Tolerance
Authors: Chen Yong Yan , Dai Wei
Published: August 2013

When the topology of data network in power grid was destroy, the system still need to provide intrusion tolerance service. The trust values relationship of the nodes in data network need be calculated. The trust value of the upper and lower limit can be deduced and adjusted to eliminate the problem of over-reliance on threshold. And the introduction of confidence values to assess the quality of the trust value. A recursive algorithm is used to obtain the average of the trust data to compute confidence values. The experimental result proves the veracity and validity of the method.
Study on Semantic Model of Urban Rail Transit Emergency Plan
Authors: Du Yun Tao , Zhong Ling Ling
Published: August 2013

Emergency plan modeling is the foundation of the work for digitizing emergency plans. On the basis of analyzing the content and structure of the existing urban rail transit emergency plans, a formalization method for emergency plans based on ontology is put forward. The core terms of emergency plans are extracted and classified. The relationships between various concepts are concluded. Combined with related concepts of ontology five meta-words, the ontology model of emergency plans is constructed. The emergency plan system from a subway company is presented as a real world case to establish the semantic model, providing the feasibility of the method proposed.
A Novel Control Strategy of PWM Rectifier
Authors: Wang Wei , Shi Xin Chun
Published: August 2013

Based on the mathematical model analysis of the three-phase voltage source PWM rectifier under abc reference frame and dq reference frame in this paper, a kind of three-phase voltage source PWM rectifier feed-forward decoupling control strategy is proposed. Dynamic response of DC bus voltage for PWM rectifier is very important, because higher response means little DC bus capacitor. An adaptive PI controller for the DC bus voltage was designed in this paper in order to improve the dynamic response. The experimental results indicate that this control method has good steady-state performance and fast dynamic response. For the reason of its simple, this control method has certain practical value.
Analysis Software of Power Quality and Power Regulation for Wind Farm Based on DEWETRON
Authors: Tian Chun Guang , Yuan Ye , Bi Zheng Jun , Cai Li Xia , Han Xiao Juan
Published: August 2013

t is a powerful guarantee for the safe and stable operation of the grid to detect and study its characteristics such as the active power, the reactive power, the flicker and the harmonic. Dewetron5000 system and its software can be used to collect and analyze the experimental data of power system without getting the corresponding conclusion quickly, directly and clearly. In view of the above questions, the software has been developed to test the power quality for wind farm into the grid, the collected data after being processed by the secondary can display the situations of power quality and power regulation clearly and fast. The software has a very important role on the development of the test standard and system for wind power grid.
Study of PI Adaptive Non-Linear Control Strategy Based on CCM/DCM Fast Identification for DC/DC Converter
Authors: Fan Xue Xin , Xie Zhen , Xiao Fei , Wang Rui Tian
Published: August 2013

An isolated three-level H-bridge high-capacity DC/DC converter is a good solution for transferring energy from middle-voltage network to low-voltage network. The transformer can be smaller and lighter with high working frequency, so phase shift Pulse-Width Modulation (PWM) is used by converter. The small signal model has been built by theoretical derivation and verified by simulation when the converter working on Continuous Conduction Mode (CCM) and Discontinuous Conduction Mode (DCM). The analyze results indicated that the mathematic models and dynamic properties were different when converter working in disparate mode. Therefore, the PI parameters of the controller can be hardly chosen to reach the excellent dynamic performance when the converter meets the large disturbance of mode change. That is, you can hardly find a group of PI parameters for converter working well in all load range. Aiming at it, A PI adaptive non-linear control strategy based on CCM/DCM fast identification has been proposed. The fast mode identification was based on inductor voltage characters, and the mode information wound send out in less than a switching period. So, the PI parameters can be instantaneous changed by mode signal to achieve the best dynamic property. The operation principle and analyze result of the control strategy is verified by the prototype at last.
Research of Heat Transfer Performance on Tablet Microstructure Heat Exchanger Used for LED Lamps
Authors: Zhuang Jian , Hu Wei , Wu Da Ming , Zhang Ya Jun , Zhao Zhong Li , Liu Shui Xing
Published: August 2013

With successful development of LED lamps, the dissipation of LED lamps has become the core problem. If the heat produced during the work cant be loss in time, the high temperature of the lamps will affect their service lives or even damage the LED permanently. In this paper, based on the principle of finite element method, using thermal simulation software, the effect of the geometric characteristics micro-structure of the heat exchanger combining polymer micro-scale fins and metal base on the heat transfer characteristics was simulated. The impact of the fin width, wing fin pitch, fin height and thickness of the substrate on the tablet microstructure heat transfer characteristics was analyzed. The results provide some technical reference for the design and application of the micro heat exchanger.
Performance Analysis of the New Helicopter-Lift Device
Authors: Yang Yue Ming , Yang Qin Yu , Yao Jin Bo , Li Yuan Kai
Published: August 2013

Helicopter lift system aerodynamic design is the key to success helicopter design technology. Currently helicopter lift system has complex structure, fuel consumption, low efficiency and many other issues, which greatly limits its potential to play, so the research of new efficient, simple and practical helicopter lift system is imminent. In this paper, a new kind of helicopter-lift device, combined with the whole structure, the specific presentation of the entire lift device works and ways of working. Based on 2D N-S equations and Spalart-Allmaras turbulence model, the device numerical simulation of two-dimensional aerodynamic characteristics. The results showed that: The lift device is feasible, can be applied to the helicopter technology. The results can lift device is designed for the helicopter to provide certain technical reference.
PWM/PFM Dual-Mode Synchronous Boost DC-DC Regulator
Authors: Li Wen Yuan , Zhang Jun
Published: August 2013

a novel peak current PWM/PFM dual-mode boost dc-dc regulator applying for neural signal regeneration is proposed in this paper. The converter can adaptively switch between pulse-width modulation (PWM) and pulse-frequency modulation (PFM) both with relatively high conversion efficiency. Soft-start circuit is designed to eliminate the surge current at the start up stage of the regulator, other protection modules are also contained. The paper analyzes the model and stability of the system. The operation frequency of the regulator is 1MHz. The simulation results show the efficiency of the system is relatively high in PWM mode, up to 95%, in PFM mode it also has good efficiency.
The Design and Control of the Humanoid Walking Robot
Authors: Bao Ze Fu , Zang Peng , Wang Jiang Ping
Published: August 2013

The paper focuses on researching the biped humanoid walking robot about its dynamic characteristics and the control technology. The humanoid robot adopts the structure of a human body. There are a total of 19 DOF full body which results in a high balanced capacity and easily controlled arms and legs. In this way, the robot can make all kinds of imitation of human actions, such as tai chi, dancing and so on. My robot can serve as a development platform. By installing different modules of sensors to change or expand the functions of the body, the robot can satisfy the users demand in an economical way.
FPGA Implementation of Direct Digital Frequency Synthesizer
Authors: Yang Hui Jing , Yu Fan
Published: August 2013

Direct digital frequency synthesizer (referred to as DDS) is a kind of complete digital frequency synthesizer. In this article the principle of DDS were introduced. Set the design index of distortion and resolution, and design parameters of DDS in accordance with the index. DDS design describes by Verilog HDL, implement controlling four parameters of the waveform, frequency, phase, amplitude. Using FPGA and Quartus II/Nios IIwhich is Altera EDA software, realize DDS and its peripheral input / output and DA platform. The final direct to DDS simulation results and the overall DDS platform oscilloscope experimental data, verify the correctness of the design of DDS with the two data.
Digital Protection Test Platform Based on RTDS
Authors: Liu Tao , Yao Hao , Jiang Tao , Zhang Bing Da
Published: August 2013

As IEC61850 has become the general international standard of substation communication, protections and the other secondary devices have new characteristics of digitization and network. The input signal is no longer the traditional analog alternating current component and the protection trip switch, SMV Message and Goose Message instead. The network performance is more and more important and normal relay protection test device is no longer suitable for digital protections. This paper has analyzed the transmission methods of the SMV message and GOOSE message, developed the digital protection test platform based on RTDS and put forward a digital protection test interface design based on FPGA.
A Frequency Coordination Control Strategy for Islanded Microgrid
Authors: Liu Guan Qi , Hu Ting , Lin Jin Jiao
Published: August 2013

This paper investigates a frequency coordination control strategy for islanded microgrid. The dynamic process is divided into three levels including the dynamic support, droop control and zero error regulation. The control strategy is classified into primary and secondary frequency regulation. Simulation is performed on DIgSILENT and the results verify the effectiveness of the proposed control strategy and improve the performance of system frequency regulation.
A Broadband Septum Dual Circular Polarized Antenna for Airborne Communication System
Authors: Shui Xiao Zhong , Wang Wei , Zhou Kai , Lv Xin
Published: August 2013

In this paper, a broadband septum dual circular polarized antenna with dielectric loaded is designed. In order to expand the bandwidth, the antenna uses the form of dielectric loaded in the waveguide and extends the dielectric to meet the miniaturization requirements, which can improve the Gain and the matching of waveguide. The simulation results show that in the 40% relative bandwidth, the VSWR is lower than 1.7. The isolation between the two input ports is lower than-10dB. Gain is larger than 7.5dB and the axial ratio is lower than 3.5dB.