bluuebunny/crossref_metadata_2025 huggingface dataset:
Research and Application of the Deep Horizontal Drilling and Completion Technology for Liaohe Oilfield Buried Hill Reservoir
Authors: Nie Gui Min , Guo Dan , Wang Yan , Cheng Xiao Wei
Published: December 2012

With the depletion of shallow-layer oil and gas pools inLiaohe oilfield, buried hill stratigraphic reservoirs in Liaohe oil field are becoming main objectives for exploration in recent years, especially in high-risk areas of Xinglongtai deep the Hing ancient buried hill resources are particularly rich. Since 2007, Liaohe oilfield increased investment for Buried Hill reservoirs with deep horizontal drilling developt the buried hill reservoir. Liaohe has completed 36 deep horizontal, with a total footage of 183920m, the average depth of 5109m. Improving drilling speed of "buried hill deep horizontal and branch horizontal wells”, and reducing drilling costs are of great urgency. “Hing buried hill deep horizontal, horizontal wells,” with composite drilling technology, supporting the optimization of PDC bits, the high-pressure jet drilling, the MWD borehole trajectory control and optimization of drilling parameters, the new drilling fluid technology and so on. With a large number of horizontal wells put into Buried Hill stratigraphic reservoirs, oil and gas production of average deep horizontal well increase of 2-5 times. Besides, the previous recovery and production of oil and gas reservoirs significantly improved to create an objective economic and social benefits.
Modeling and Testing of Linear Electric Servo System
Authors: Zhao Xue Jiao , Lin Fan
Published: December 2012

A mathematic model of the electric servo system was founded in this paper and several groups of data collection and data processing were executed to check up the model veracity. This paper described the data processing steps and analyzed the contrast of test and simulation results. This model is effectual to describe the performance of this kind of servo in respect that the results are mainly consentaneous.
Analysis on a Novel Halbach-Type Transverse-Flux Linear Oscillatory Motor for Linear Compressor
Authors: Lei Mei Zhen , Dai Wen Zhan , Wang Li Qiang
Published: December 2012

Linear oscillatory motors with short stroke represent an excellent alternative in linear compressor applications. A novel halbach-type transverse-flux linear oscillatory motor (HTLOM) with two stators was presented, which has the advantage of without moving iron core, compact structure, light weight, easy-stacked stator and smooth thrust force characteristic. Based on the principle analysis, the static thrust force was calculated by three-dimensional (3-D) finite element analysis (FEA). Then the dynamic simulation was presented for the resonant characteristics of current, displacement, active and reactive power and power factor versus frequency. The analysis result shows that the novel HTLOM with two stators is suitable for linear compressor application, and its maximum efficiency can be achieved at velocity resonance by spring stiffness selection. The conclusions are very significant for the further driving control in industrial usage.
Experimental Research on Transmission Characteristics of Working Mechanisms for Servo Mechanical Presses
Authors: Hu Jian Guo , Sun Yun Song , Cheng Yong Qi , Ruan Wei Ping
Published: December 2012

In order to analyze the transmission characteristics of the knuckle-triangle working mechanism for servo mechanical presses, an experimental prototype was set up, and a wireless measurement system was developed, to measure the kinematic and dynamic characteristics of the working mechanism. The working principle of the dynamic measurement was expressed. The forming force applied to the slide was measured by a donut-shaped load cell. The driving torque applied to the crank was measured by a resistance strain gage. To collect the testing signals of the forming force and driving torque conveniently and synchronously, a wireless measure system based on WiFi is proposed. Moreover, when the input crank rotates at different angular speeds, the slide stroke curves were measured by a grating scale. The experimental results showed that the developed system can perform wireless measurement, and provide experimental basis for the analysis of kinematic and dynamic characteristics of the working mechanism with servo input.
Traction and Transmission Monitoring System of EMU’s
Authors: Zhao Ya Hui , Zhu Qin Yue
Published: December 2012

In this paper, much research is done on the traction and transmission monitoring system design and implementation of data acquisition, display, analysis and processing for the EMU’s traction and transmission system. On the basis of description of traction drive unit compositions and testing requirements, the hardware framework of traction and transmission monitoring system based on CPCI bus technology is presented in details. The testing system is then designed which is capable of electrical parameters data processing, display, storage, etc. by using LabVIEW software as the development platform. The system is miniature and provides a scientific technique method and assessment for the judge of parameter time histories characteristic analysis of the traction drive unit key components which makes it have a high application value.
Single-Loop SVPWM Modulate Strategy for Permanent Magnet Synchronous Motor Control System
Authors: Zhou Qi Xun , Zhou Yong , Zhang Yu Feng
Published: December 2012

The advantage and disadvantage of the common control methods for permanent magnet synchronous motor (PMSM) are analyzed. Combined the sine pulse-width modulation (SPWM) and field oriented control (FOC) algorithm, a novel control method of the space vector pulse-width modulation with single closed loop is presented. In MATLAB-Simulink, based on the mathematic model of PMSM, used the S-function and the algorithm of single-loop space vector pulse-width modulation (SL-SVPWM) a servo-model of PMSM is established. Via experiment, compared SPWM method to SL-SVPWM method, the different results of phase current waveform of PMSM are drawn; and the dynamic response behavior of the motor which driven by the method of SL-SVPWM is analyzed. The results of the simulation and experiment verified that the SL-SVPWM method in this paper simplified the control system of PMSM, and this control method has better control stability.
Research on Production Optimization Model of the Closed-Loop Supply Chain with Remanufacturing Based on Product Differentiation
Authors: Jiang Hong Wei
Published: December 2012

This paper establishes a two-period production optimization model of the closed-loop supply chain with remanufacturing incorporating the consumers’ different preferences for the new product and the remanufactured product. Through theoretical analysis, we obtain the optimum production and pricing strategies, and analyze the impact of the consumers’ acceptance for the remanufactured product on production quantity and product pricing, which provides a basis for the manufacturer’s production decisions.
A New Training Algorithm for RBF Neural Network based on Dynamic Fuzzy Clustering
Authors: Cui Yan Jun , Ma Yan Dong , Li Jie , Zhao Zheng
Published: December 2012

A new algorithm for training radial basis function neural network (RBFNN) is presented in this paper. This algorithm is based on the dynamic fuzzy clustering method (DFCM). The algorithm has a number of advantages compared to the traditional method based on k-means. For example, it does not need to know the number of the hidden nodes and to predicts more accurately. Due to these advantages, this method proves to be suitable for developing models for complex nonlinear systems.
The All-Optical Fiber Perimeter Alarm System
Authors: Wang Dong Sheng , Wang Yu Tian , Pan Wei Wei
Published: December 2012

A all-fiber perimeter alarm system is designed which is composed of the optical Fiber Sensor Module(FSM) laid along the perimeter and Security Information Control Center(SICC) (including display terminals-the large screen display, the terminal of personnel operation, the system control host, etc.) and optical fiber fence (or sensor board). It uses optical fiber (cable) as the sensing and transmission device, through directly contacting with optical fiber (cable) or through the carrying material, passing various disturbances to the fiber (cable), carrying continuous real-time monitoring and collecting disturbance data. Through the back-end analysis, processing and intelligent identification, it can determine the different types of external disturbances. The system can automatically obtain the real-time alarm information that the optical cable generates and process these warning messages according to predefined business logic, then generate sound and light warning prompt and provide several functions of statistics, query on the warning message.
The Research on Recognition of the Irregular Objects
Authors: Han Guang Hai , Ma Xin Jun
Published: December 2012

It usually need different ways to process different objects in the manufacturing, Therefore, firstly we need to distinguish the categories of objects to be processed, then the machine will know how to deal with the objects. In order to automatically recognize the category of the irregular object, this paper extracted the improved Hu's moments of each object as the feature by the way of processing images of the working platform that the irregular objects are putting on. This paper adopts the variable step BP neural network with adaptive momentum factor as the classifier. The experiment shows that this method can effectively distinguish different irregular objects, and during the training of the neural network, it has faster convergence speed and better approximation compared with the traditional BP neural network
Research on Parameters Optimization Algorithm in Support Vector Machine Based on Immune Memory Clone Strategy
Authors: Zhu Fang , Wei Jun Fang
Published: December 2012

The performance of support vector machine (SVM) depends on the selection of model parameters, however, the selection of SVM model parameters more depends on the empirical value. According to the above deficiency, this paper proposed a parameters optimization method of support vector machine based on immune memory clone strategy (IMC). This method can solve the multi-peak model parameters selection problem better which is introduced by n-folded cross-verification and automatic acquire the optimum model parameters. Proved by the simulation results on standard data, this method has higher precision and faster optimization speed. In a word, it can be used as an effective and feasible SVM parameters optimization method.
Study of Speech Emotion Recognition Based on Prosodic Parameters and Facial Expression Features
Authors: Wang Yu Tai , Han Jie , Jiang Xiao Qing , Zou Jing , Zhao Hui
Published: December 2012

The present status of speech emotion recognition was introduced in the paper. The emotional databases of Chinese speech and facial expressions were established with the noise stimulus and movies evoking subjects' emtion. For different emotional states, we analyzed the single-mode speech emotion recognitions based the prosodic features and the geometric features of facial expression. Then, we discussed the bimodal emotion recognition by the use of Gaussian Mixture Model. The experimental results show that, the bimodal emotion recognition rate combined with facial expression is about 6% higher than the single model recognition rate merely using prosodic features.
The Research of Least Square Support Vector Machine Model and its Simplified Method
Authors: Zhao Wen Jie , Zhang Tao
Published: December 2012

A simplified structure of the least square support vector machine (LS-SVM) model is proposed in this paper. Under the premise that the accuracy of LS-SVM model is unchanged, a small amount of training samples are chosen, which further fit this model by LS-SVM modeling. Finally, a typical nonlinear problem is taken as example to test the performance of this simplified model and the simulation results show that this simplified method proposed in this paper is effective.
Research on Automatic Identification of Airplane Targets on Infrared Images
Authors: Xu Zhong Lin , Zhao Wen Jie , Wang Hong Wei , Liu Quan Liang
Published: December 2012

No matter in civil remote sensing or in military investigation, infrared images have an extensive application value. According to the characteristics of the infrared images, in this paper, we build comprehensive feature vectors of airplane identification based on comprehensive consideration of the characteristics of infrared images, including boundary invariant moments , normalized moment of inertia and geometric features. Identifying an air plane by calculating the comparability of feature vector between template image and the image to be identified, the algorithm has been proved by experiments to have a better stability and robustness.
Application of Immune Genetic Algorithm in Survey Data Processing
Authors: Chen Wei
Published: December 2012

The immune genetic algorithm is a kind of heuristic algorithm which simulates the biological immune system and introduces the genetic operator to its immune operator. Conquering the inherent defects of genetic algorithm that the convergence direction can not be easily controlled so as to result in the prematureness；it is characterized by a better global search and memory ability. The basic principles and solving steps of the immune genetic algorithm are briefly introduced in this paper. The immune genetic algorithm is applied to the survey data processing and experimental results show that this method can be practicably and effectively applied to the survey data processing.
Lithofacies Recognition Based on Extreme Learning Machine
Authors: Tian Ya Juan , Pan Hua Xian , Liu Xuan Chao , Cheng Guo Jian
Published: December 2012

To overcome the problem of lower training speed and difficulty parameter selection in traditional support vector machine (SVM), a method based on extreme learning machine (ELM) for lithofacies recognition is presented in this paper. ELM is a new learning algorithm with single-hidden layer feedforward neural networks (SLFNN). Not only it can simplify the parameter selection process, but also improve the training speed of the network learning. By determining the optimal parameters, the lithofacies classification model is established, and the classification result of ELM is also compared to traditional SVM. The experimental results show that, ELM with less number of neurons has similar classification accuracy compared to SVM, and it is easier to select the parameters which significantly reduce the training speed. The feasibility of ELM for lithofacies recognition and the availability of the algorithm are verified and validated
The Development of a Graphical Open-Ended Integrative Platform for Short-Circuit Calculation and Relay Setting of Power System
Authors: Li Zhi Bo , Gao Peng , Ma Jian Sheng , Yan Yong Sheng
Published: December 2012

To improve the efficiency and accuracy of relay setting calculation of power system, this paper proposed and developed a schematized and open-ended software platform in integrative relay setting. Through the advanced development of the Visio software, the graphical input of the target system topology and component parameters are made possible. The platform can automatically generate PSCAD simulation model according to the topology information and device parameters through an interface program to PSCAD, and use this power system simulation software to improve the accuracy of short-circuit current calculation. With the help of the Bookmark mechanism of WORD software, the platform provides a setting template with general protection components, which forms the basis to realize the open-ended platform. The platform also uses the API interface provided by WORD software to automatically generate the final relay protection setting report document according to the results of short-circuit current calculation and the selected protection setting components. This paper gives in detail the overall framework of the proposed platform, as well as the principle and practice of all the above parts. Moreover, the validity and practicality in improving the automation degree of the relay setting of power plant are shown through practical applications.
Study on the Performance of Cascaded STATCOM Based on DC-Link Voltage Balancing Method
Authors: Wang Yi Ting , Sun Yi Chao
Published: December 2012

DC-link voltage balancing method is the key technique of cascaded static synchronous compensator (STATCOM) while safety and reliability is required previously. However, independent control scheme is necessary for each H-bridge in consideration of the voltage balancing strategy, which is different from the assumption of carrier phase shift modulation algorithm. The influence of voltage balancing strategy on cascaded STATCOM was analyzed in detail and several feasible solutions were proposed, experiment results were shown to validate the presented analysis in the end.
The Kinematics Analysis and Intelligent Control Based on 5R Stacking Mechanism
Authors: Li Wei , Cao Xiao Yan , Lu Jiang
Published: December 2012

In this paper, a design method that teaching and playback of motion trajectory based on 5R parallel stacking mechanism is introduced. Analysis the inverse kinematics of the 5R mechanism, we can concluded that the 5R is given two original moving parts, you can uniquely identify the pose of the rod end of the implementation of parts, but in seeking the position and orientation inverse solution, the only connecting rod track can not determine the only two original moving parts. We can solve this problem with the minimum principle that the square of the residuals between the prime mover rotation angle of adjacent track points. Finally, we show the program diagram of teaching and playback. The system has such advantages as simple structure, movement speed, large workspace, motor casing fixed, load drive capability and light weight.
Design and Implementation of an Integrated Electrical Equipment Testing System for a Certain Air Defense Weapon System
Authors: Zhao Xia , Hong Qing , Yang Feng Biao , Zhang Chen Guang
Published: December 2012

With a higher level of the information techonology application in weapon system, the comprehensive electric system becomes more and more complicated, bringing about higher requirements on equipment support. In this paper, the research is mainly targeted at the integrated electrical system for a certain air defense weapon system. The offline live testing plan is employed, and simulated field simulation technology, switch topology in different forms are intergrated throughout the research to complete the performance testing on the major electrical equipment, so as to test the equipment integrity. Research and development of the testing system provide a feasible design method and means of implementation for the performance testing and trouble diagonosis for electrical equipment of the new equipment.
Design and Realization of Resolution Detection System for AD7730
Authors: Chang Xiao Ming , Sun Bin , Yao Shi Xuan
Published: December 2012

Before using high-precision ADC AD7730 in analog signal sampling system, it’s required to measure the actual resolution if needed. This paper introduces the design of resolution detection system for ADC, which is used to evaluate the resolution performance parameter of ADC. First, a framework of the application system is designed, and specified at the example of 24bit ADC AD7730 application based on the Virtual Instrument Development Environment LabVIEW. Finally, actual resolutions of input channels are given and evaluated.
Study of Reconfiguration Algorithm in Distribution System Based on Hopfield Network
Authors: Wei Na , Cheng Zhe , Wu Xiao Meng
Published: December 2012

In accordance with the characteristic of radial running an algorithm for distribution network reconfiguration based on Hopfield neural network is put forward. The in-degree of each node is determined by Hopfield neural network, it is determined whether the lines run according to the in-degree of the nodes, and the state of each loop switch is determined according to whether the lines run, and thus the distribution network reconfiguration scheme is determined finally. The energy function of the neural network and its solution method are presented. In the energy function are considered the radial running of distribution network, the lowest distribution network loss and no loop switch in some lines. The IEEE distribution network structure with three power sources obtained by the algorithm is basically consistent to that obtained by genetic algorithm, but the time spent using the former is shorter than that the latter.
Based on Compression Sensing of Video Coding in Robot Servo System
Authors: Xu Jie , Jiang Xiao Lin , Yu Xiao Yang
Published: December 2012

The robot visual servo control is the current robot control of a main research direction, this design based on the analysis of the theory of compression sensing, distributed video decoding and image super-resolution reconstruction. Simulation and experimental results show that the compression sensing theory applied to image super-resolution reconstruction, make high resolution image reconstruction can fully exert the original low resolution image of the structural characteristics, in order to protect the original low resolution image edge details such as information, and the traditional calibration approach compared with high resolution image can improve the image edge, texture, and other details of the characteristics of reconstruction effect and improve the precision of the recognition.
Probabilistic Roadmaps Based Motion Planning of a 4 Degree of Freedom Robot
Authors: Liu Yu Tian
Published: December 2012

In this paper, we used a probabilistic roadmaps(PRM) method to plan a motion path for a 4 degrees of freedom(DOF) robot in static workspace. This methods includes two phases: a learning phase and a query phase. In learning phase, a roadmap is constructed and stored as a graph , in which stores all of the random collision-free configurations in free configuration space denoted by and keeps all of the edges corresponding to feasible paths between these configurations. In query phase, the algorithm tries to connect any given initial and goal configuration to the nodes in the graph. And then the Dijkstra's algorithm searches for a shortest path to concatenate these two nodes. The experiment result demonstrates that this method applying to this 4 degrees of freedom robot works well.
The Design and Implementation of an Integrated Distribution Automation Scheme
Authors: Liu Zhi Hong , Zhang Jian Wei , Zhao Xiang , Yang Fang
Published: December 2012

According to the statistic of the distribution network operation, distribution network fault is generally located on line branch, rather than the main line. In view of the structure and characteristics of the current distribution automation system, combining the distribution network reformation and construction practice, this paper puts a comprehensive distribution automation solution that the branch line is equipped with distribution automation terminal which integrates protection and reactive power compensation function. It can achieve the rapid isolation of the distribution network failures and the power supply reliability, and dynamically improve the quality of power supply.
Alnic Measuring System for Rail Type Vehicles
Authors: Su Xiang Jun , Guo Guan Qi
Published: December 2012

This paper designed an implement scheme of the alnic automatic measuring system for rail type vehicles. The system can read information of rail type vehicles by adopting four alnics, through the PLC to achieve the vehicles’s direction measuring and vehicles counting and axle counting and velocity measuring. In order to improve system reliability, comprehensive application of the anti-jamming alnic, software fault-tolerant variety of anti-jamming measure. By setting the calibration alnic, the system effectively overcome the interference of a variety of human factors. By cleverly setting registers N1N1N3 and in accordance with the principle of FIFO N1N2N3 pass assignment, software design is simplified. This system is widely used in modern logistics production and transportation management process of large and medium-sized enterprises involving the train transportation embedded in information management control system or warehouse management control system with high precision, stable and reliable performance, the low product cost.
Laboratory Measurement of CO2 Emissions from Agricultural Waste Burning in Northeastern Thailand
Authors: Khosavithitkul Nongnaphat , Haller Kenneth J. , Chuersuwan Nares , Wannasook Thananchai
Published: December 2012

One hundred and thirty-seven samples of agricultural residue were taken from the study area of forty subdistricts in twenty districts of ten provines in the Northeastern region of Thailand. The samples were analyzed for major physical and chemical properties and subjected to simulated burning. Rice straw had the highest dry weight and bagasse the lowest. Bagasse had the highest moisture content and the highest carbon content. Results from simulated burning found that sugarcane leaf emitted more CO2 than the other residues. Weight loss on combustion was in the range of 75-92 %, and the simulated burn of agricultural residues showed CO2 emission values at 67% of the IPCC values.
Ship Transportation Forecasting Based on Extension Neural Network
Authors: Yang Jia Xuan
Published: December 2012

Over the last decade, neural networks have found application for solving a wide range of areas from business, commerce, data mining and service systems. Hence, this paper constructs a new model based extension theory and neural network to forecast the ship transportation. The new neural network is a combination of extension theory and neural network. It uses an extension distance to measure the similarity between data and cluster center, and seek out the useless data, then to use neural network to forecast. When presenting a test example of prediction of ship transportation, the results verifies the effectiveness and applicability of the novel extension neural network. Compared with other forecasting techniques, especially other various neural networks, the extension neural network permits an adaptive process for significant and new information, and gives simpler structure, shorter learning times and higher accuracy.
Research of Ship-Bridge Collision Early Warning in Three Gorges Reservoir Area
Authors: Yang Xue Hui , Zhang Min , Xing Xiang Chun
Published: December 2012

In order to improve the level of water transportation information management and decrease the loss of ship-bridge collision, a ship-bridge collision early warning calculation method that based on fuzzy math and expert advice was established. It was used in Chongqing VTS and the real ship experiment was made. The results show that this method can predict the risk of ship-bridge collision, avoid the collision accident, which have value in practice and popularization.
The Weaving Section Length Optimization Based on the Optimal Velocity Car-Following Model and Symmetric Lane-Changing Rule
Authors: Liu Xi Min , Lu Shou Feng
Published: December 2012

The aim of the paper is to study the effect of the weaving section length on traffic flow operating under the different traffic demand. The paper uses the optimal velocity car-following model and symmetric lane-changing rule to simulate traffic flow operating in the weaving section, and calculate the headway and average speed under the different weaving section length. The results show that there is a critical value for the weaving section length. When the weaving section length is less than a critical value, the space headway significantly increase and the speed significantly decrease. When the weaving section length is larger than the critical value, the increased weaving section length has little improvement of traffic flow performance. The study proposes the critical value for the weaving section length of city expressway. Lastly, the paper analyzed the trajectory of traffic flow in the phase space of speed and space headway.
Measurement System for Characterizing Compression Properties of Textile Materials
Authors: Yao Bao Guo , Yan Li Xia , Hong Shui Yuan , Wang Jian Chao
Published: December 2012

A new measurement system was developed to characterize the physical compression properties of textile materials based on the mechanical device, microelectronics, sensors and control system. Derived from the typical pressure-displacement curve and test data, three indices were defined to characterize the compression performance of textile materials. The measurement principle and the evaluation method for compression properties of textile materials were introduced. Twelve types of fabrics with different structural features and made from different textile materials were tested. The one-way ANOVA analysis was carried out to identify the significance of the differences of the evaluation indices among the fabrics. The results show that each index is significantly different (P<0.05) among different fabrics.
Two Dimensional Cellular Automaton Model of the Mixed Traffic Flow for Urban Traffic
Authors: Yang Li , Hu Jun Hui , Kong Ling Jiang
Published: December 2012

Based on the two-dimension cellular automaton traffic flow model (BML model), a mixed traffic flow model for urban traffic considering the transit traffic is established in this paper. Under the don't block the box rules and the opening boundary conditions, the impacts of transit traffic, the central station, traffic lights cycle, the vehicles length on the mixed traffic flow is studied by computer simulation. Some important characters appearing in the new model are also elucidated. It shows that traffic flow is closely related to traffic lights cycle, the geometric structure of transport network and boundary conditions. Under certain traffic light cycle time, the traffic flow has a periodical oscillation change. The comparison to practical measured data shows that our stimulation results are accordant with the changes of real traffic flow, which confirms the accuracy and rationality of our model.
Numerical Analysis of Stress and Temperature Coupled Field for Boiler Superheater in Thermal Power Plant
Authors: Zhu Rui , Ren Jian Xing
Published: December 2012

Boiler failure is the main power plant boiler operation fault. And boiler superheater tube is one of the important reasons for boiler failure, which affects the safe and stable operation of power generation equipment. Structure design and calculation of boiler superheater has important influence on performance and life of boiler, so three-dimensional structural model of boiler superheater is built in this paper. Based on the finite element method boiler superheater in temperature and stress coupled field are analyzed. The highest temperature, maximum stress, and distribution characteristics of stress and temperature couple field of boiler superheater including straight and elbow section are computed. The date on the actual operation of a power plant was used in the process of analysis. And thermal physics and mechanical properties of the boiler superheater tube were taken full consideration. It provides a reliable basis for reasonable design and safety evaluation of the boiler superheater.
The Design of Display System for Elevator Enclosure Based on STC11L60XE
Authors: Cao Qing Song , Li Jian , Zhou Ji Hui
Published: December 2012

In order to meet the requirement of magnificent appearance and humanization of the elevator car's decoration, this paper designs a elevator car's display system based on the STC11L60XE. This system is consisted of control module, display module, DS1302 clock module and SJA1000 transceiver module. The control module collects data from the DS1302, uses SJA1000 to receive and analyse data from the elevator motherboard, then drives LCD controller to display information of time and elevator running state. The actual tests in elevator shows that the system has a normal and stable display and can achieve reservation functions.
A High-Speed and High-Linearity BiCMOS Optically Coupled Isolation Amplifier
Authors: Li Shu Han , Yang Ning , Cheng Li , Zhang Sheng Hua
Published: December 2012

To improve the current non-linear optically coupled isolation amplifier and high power consumption, we designed a low-power, high-speed and high-linearity BiCMOS optically isolation amplifier. There are only two push-pull output stages configuration bipolar transistor (BJT) in the design process, the rest of the circuit is the CMOS device. To improve amplifier gain linearity and stability, we introduce the complementary symmetrical photodiode, in the optically coupled part and every amplifier, negative feedback is introduced. Experimental results indicate that the design of optically isolation amplifier ± 3 dB bandwidth increases 40 kHz than optically isolation amplifier ISO100 bipolar, When the power supply voltage is 4.8 V, the delay - power product of DP is lower than ISO100 37.3 pJ, gain linearity is up to 5.5 × 10-5, which is suitable for high-speed control system.
10 Gb/s Burst-Mode Transimpedance Preamplifier in 0.13µm CMOS Technology
Authors: Gu Gao Wei , Zhu En
Published: December 2012

A 10Gbit/s burst-mode transimpedance preamplifier is described. Regulated cascade (RGC) TIA core with variable gain, fast response peak detector, single-to-differential and output buffer are included, providing auto-gain-control and threshold extraction functions. The burst-mode preamplifier is implemented by 0.13µm CMOS technology, presents a high gain of 67.9dB with a 3-dB bandwidth of 6.92GHz and a low gain of 57.4dB with a 3-dB bandwidth of 8.60GHz with a settling time less than 20ns.
Design of a Synthesized Merging Unit Based on IEC 61850-9-2
Authors: Wang Yi Ming , Tan Jian Cheng
Published: December 2012

To meet the requirements of smart substations for digital information, integrated functions and compact structure, the definitions of merging units in IEC 60044-8 and IEC 61850-9-1/2 were analyzed. Based on the analysis, this paper described a realization of merging units used in the electronic transformers. The hardware and software architectures of merging unit were proposed. According to the design, the merging unit realizes synchronization of sampling pulse, receiving and processing of sampled values, and data transmission. An additional function of phasor measurement was included, which makes it a synthesized device between the process level and the bay level of the digital substation. The data packets were captured and analyzed by Wireshark, corresponding with IEC 61850-9-2, which demonstrates the high flexibility and utility value of the merging unit.
Remote Data Acquisition System Based on Embedded RT-Thread
Authors: Shi Xue Fei , Feng Tao , Zhang Xiao Ming
Published: December 2012

Currently integrated network controller could implement data transmission through Internet. But commonly they have higher power consumption, fewer channels which could not be changed and less TCP/IP connection. A remote data acquisition technology based on embedded real-time operating system RT-Thread is presented in this paper. Server and client were constructed respectively according to TCP/IP protocol stack provided by operating system itself. Hardware circuit was centered with large capacity enhanced MCU named STM32F103ZET6. Ethernet interface chip DM9000AEP and network connection HR911105A were applied in our system. Socket API interface functions provided by RT-Thread were utilized in client and server software programs. Experimental results show that this system needs less hardware sources to implement more TCP/IP connections during remote data acquisition process.
Synchronization Analysis for Hard Real-Time Multicore Systems
Authors: Yang Mao Lin , Lei Hang , Liao Yong , Hu Lin Hui
Published: December 2012

Multicore processors are increasingly used in real-time embedded systems. Better utilization of hard real-time systems requires accurate scheduling and synchronization analysis. In this paper, we characterize the major synchronization penalties arising from partitioned fixed priority scheduling for hard real-time tasks on multicore platform, including transitive remote preemption, multiple remote blocking, and multiple priority inversions. Subsequently, we propose a new response time analysis by improving the approach to bound task blocking time. The key idea of this approach is to classify the total blocking time into (i) direct blocking, including local and remote blocking, and transitive remote preemption; and (ii) multiple local interference which is incurred by multiple priority inversion. Simulation results indicate that the proposed approach produces less pessimistic results in task blocking time, and better schedulability performance.
The Design of Wireless Broadband Communication System Based on OFDMA
Authors: Liu Zuo Xue , Dai Jian Mei , Liu Bo
Published: December 2012

A Wireless Broadband Communication System has been made up based on OFDMA and AMC technologies. The system structure and working pattern is introduced, the OFDMA allocation model, the MIMO and AMC scheme are present, and the parameter such as transmitting power, receiver sensitivity, transmitting antenna gain and receiving antenna gain are designed. The system enables high quality wireless broadband communication. As a supplement with wired communication systems, the system could fulfill the requirement of recovery local communication rapidly when some accidents take place.
The Research of Distance Learning Video Living and Video on Demand Based on Wireless Mobile Network
Authors: Zhao Ji Chun , Guo Jian Xin
Published: December 2012

Traditional distance learning is based on wire network, such as internet, cable television network, telephone network and so on. With the development of wireless mobile network, there are many advantages such as without time and space limit, so it can bring some chance for distance learning video living and video on demand. In the text, we discussed distance learning history and development, wireless network development, and the designing video living and video on demand based on wireless mobile network, at last, the conclusion was given. The terminal users can get distance learning video living and video on demand service through the wireless network.
Research on Beamforming Technique for Communications in Moving of Warship Circular Array Antenna
Authors: Wu Qing Hua , Zhang An Qing
Published: December 2012

Uniform circular antenna array of warship can bring beam and interference null steering from 360° symmetry without rotating. Directional communications can be achieved by UCA geometry. To solve the problem that warship’s stance is changed dynamically in course of sailing, a method was suggested that the electricity phases of UCA elements were changed based on information of stance about longitudinal sway, transverse sway and course. The proposed method can change beam directivity, and ensure providing a very directive pattern with stabilization, so that warships communication in moving each other. An expression of array maximum directivity forming with dynamic is proposed for UCA antenna. The simulation demonstrates that the beam forming method of communications in moving is validity, and is worth using with wide application.
Study on Network Communication Protocol of UNISCOPE
Authors: Chen Jing
Published: December 2012

This paper introduces basic characteristics of UNISCOPY protocol, analyses information to transfer question between a master station and a slave station and the precise location of information displayed on the screen. Exploring questions of main station information level 4, terminal information, information segmentation, synchronized transmission, check parity and screen addressing.
Design and Application of DECT Voice Gateway System Based on Mobile Network
Authors: Han Yu
Published: December 2012

In this article, studying the integration relations between mobile network and DECT technology, a design scheme about Voice Gateway System is introduced. This system builds a small voice network, providing shared multi-parities talking service, for home and office.
Data Desynchronization Attacks on Two Lightweight Security Protocols for the RFID System
Authors: Deng Miao Lei , Zhang Hao Jun , Zhu Wei Jun
Published: December 2012

Radio frequency identification (RFID) systems need security protocols to provide confidentiality, user privacy, mutual authentication and etc. This paper analyze two of the newest RFID security protocols which proposed by Niu et al. and Fu et al. form the security viewpoint of data desynchronization attack. These two lightweight protocols were expected to proposed security protections for the RFID system and safeguard against almost all major attacks. However, we found that these two RFID security protocols were vulnerable to the attack of data desynchronization. Based on strand space model, data desynchronization attacks on these two protocols were analyzed. Furthermore, improvements to overcome the security vulnerabilities of these two protocols were given.
Research on First-Price Sealed Auction Game Handoff Strategy
Authors: Ge Zhi Hui , Wang Wei Wei , Li Tao Shen
Published: December 2012

In wireless mesh network, handoff decision strategy chooses targets according to the detected signal strength, in which way too many mesh clients will be associated to routes with stronger signal strength, resulting in severe load imbalance and a huge waste of wireless resource. In this paper, we propose a new first-price sealed auction game handoff strategy, which takes into consideration the signal strength and network load when choosing handoff target. This strategy assures the fairness during the handoff process as well as the load balance in the wireless mesh network. The simulation results show that our proposed strategy achieves better performance in the aspects of user number and signal strength.
Research and Design of Virtual FIR Digital Filter Based on LabVIEW
Authors: Liu Jun , Guo Rong Xing
Published: December 2012

Digital filter technology is quite important in the signal processing field. This paper realizes digital filter designing by way of the virtual instrument technology, and this paper introduces the filter plat front panel and program frame diagram designing based on the FIR filter algorithm through the LabVIEW platform. Through the simulation, the virtual digital filter validates the designing accuracy. The digital filter achieves the ideal effect in filtering, which can be widely applied into the signal processing field, such as digital de-nosing, and experimental study, etc. Digital filter panel designing has broad application prospect and research value.
The Design of RSSI Acquisition of Wireless Communication Network Based on ZigBee
Authors: Ge Xiao Yu , Wang Qing Hui , Wei Li Feng
Published: December 2012

ZigBee is a kind of new wireless communication technology which is widely used in many fields. It is now widely recognized that ZigBee is suitable for short distance, low complexity, low power, consumption and low rate applications. One of the most important applications is embedded system. Standards of the physical layer and the data link layer are developed by the group of IEEE802.15.4 and the others are developed by ZigBee alliance. First of all, the paper introduces the application of ZigBee wireless communication network. Then the emphases are to build ZigBee wireless communication network and take advantage of Visual Basic to realize RSSI collection.
The Design of High Available Single Sign-On Server of Nginx-Based
Authors: Shao Qi Feng , Yang Tian Chi , Hou Wei
Published: December 2012

Single sign-on system could satisfy with the requirement of the multiple authentication in different applications, and implement unified authentication and user management. The high availability is the most significant factor of the single sign-on system ability especially in the situation of huge number of access. In this paper, it gives a method by using Nginx-based system to solve that concurrent access availability problem, and port Nginx system into practical implement.
Modeling of MIMO Time-Varying Channel
Authors: Li Hua , Shi Jian Fang , Wu Juan Ping , Hao Run Fang
Published: December 2012

Wireless communication environment is very complex, so it is difficult to modeling of MIMO channel. A MIMO channel model was brought forward which has frequency selectivity, and time correlation. Simulation shows this related channel capacity is consistent with theoretical channel capacity. So this model provides powerful implement for simulation of MIMO capability, analysis of system capacity and evaluation of performance.
Confidentiality and Integrity Protection Method Based on One Time Encryption
Authors: Guan Ming Shan , Ma Hai Feng
Published: December 2012

Abstract. Aiming at current problem of high computing overhead of encryption and authentication, this paper proposes a confidentiality and integrity protection method based on one time encryption. The method packages data block and verification data together, and then encrypts it. The confidentiality is guaranteed by traditional encryption mode and the integrity is guaranteed by decrypted verification data. Analysis and simulation show that the method has less time and space overhead than standard encryption and authentication mode. The method can be applied to other integrity and confidentiality protection schemes, and can meet the performance requirements of the most applications.
Research on Radio Frequency Assignment Mechanism of the RoFSO Network Based on Site-Specific Cognition and Utility Function
Authors: Li Ya Fei , Yue Peng , He Chuan
Published: December 2012

For the problem of the throughput degradation and fairness deterioration of the conventional radio frequency (RF) allocation mechanism in “hot point” areas, this paper presented a novel RF allocation mechanism using radio over free space optics (RoFSO) technology. The proposed algorithm contained initial RF assignment and optimal RF assignment. The initial RF allocation was built on the distribution of adjacent remote access units (RAUs). In addition, the optimal RF allocation includes RF switching and RF scheduling, both of which were designed based on site-specific cognition of stations. Through the analysis of simulation results, we know that our proposed algorithm in RoFSO network outperform the conventional RF allocation algorithm in wireless local area network (WLAN) by 350%, 45%, and 90% for average goodput of each user, fairness index of entire network and average frame service delay (FSD), respectively.
A Network Identity Authentication Protocol Based on Fingerprint and Probabilistic Encryption of RSA
Authors: Zhu Li Juan
Published: December 2012

Security transaction problem between the client and the server was solved by a network identity authentication protocol of this paper. We designed this protocol from two aspects, one is the hardware structure design, and the other is data encryption. We used fingerprint sensor to gather the user’s fingerprint and characteristic value instead of password input from keyboard, and used RSA probabilistic encryption to generate public key and private key of the client and public key and private key of the server, and then used the protocol certification process to finish operation of the data encryption and decryption. This protocol guarantees every specific legitimate user rights and prevents the hacker from attacking network data, and the practical application shows this protocol is absolutely safe.