bluuebunny/crossref_metadata_2025 huggingface dataset:
Study on Dynamical Behaviors Mechanism of Sine Voltage Compensation in Buck Converters
Authors: Zhang Fang Ying , Hu Wei , Long Xiao Li , Chen Xin Bing
Published: April 2014

This paper analyzes the effect of stable behaviors when amplitude, phase of sine voltage compensation signal are added in the system, reveals that the dynamical behaviors mechanism that sine voltage compensation signal changes feedback voltage-mode controlled buck converter lies in changing the duty cycle without impacting the system stable error via analyzing the change of period multiplier in Monodromy matrix and conditions of period bifurcation, and finally achieves stabilization control for bifurcation and chaotic behaviors. The simulation and experimental results prove the correctness of the theoretical analysis.
Experimental Study on Large Turbine HP-Valve’s Excitation Fault Caused by Steam’s Unsteady Flow and its Economic Solution
Authors: Wan Jie , Gu Jun Sheng , Ren Guo Rui , Guo Qian , Li Zhi Hua , Liu Jin Fu
Published: April 2014

In order to stabilize the uncertainty of large-scale new energy power’s random fluctuation in the grid, there is an increasing number of large thermal power generating unit needing to do deep variable load operation. However, the pattern of steam inlet on turbine’s part load has a very significant impact on the unit operation condition of safety, stability and economy. In this paper the HP-valve’s body vibration fault of large steam turbines caused by unsteady steam flow under partial arc admission operating at part of their full load is researched, and an economic solution based on analysis and diagnosis of fault mechanism is provided by designing of complex HP-valve opening sequence rules. This solution solves the safety problem of valve vibration and avoids the economic loss by using full arc admission or replacing the valve body equipment directly, which is of great effective and practical verified by units’s actual operating experiment. As a result, it demonstrates that the optimization of HP-valve iadmission mode can not only change the stress state of high pressure rotor and prevent its vibration caused by the force of unbalanced flow to improve the shafting stability of the unit when running with variable load, but also can improve the steam instability and solve the resulting vibration problem in HP-valve. And it is of great engineering practical value to improve high-power thermal power unit depth secure efficient load operation.
Research and Design of Online Measuring Temperature Device for Switch Contacts of Switch Cabinet
Authors: Ye Qing , Ji De Gui , Yan Ting Wu , Shan Jin Ning , Wang Yu Peng
Published: April 2014

In order to detect switch contact temperature of high voltage switch cabinet in the operation of the cabinet, this paper puts forward a wireless measurement way to solve the measuring temperature problem of high voltage switch of the switch contact using magnetic field coupling idea. The temperature danger can be achieved in time to reduce switch burn injury. The device is mainly composed of temperature acquisition part and temperature display part. The two parts are connected by wireless data transmission. By test determination, the method is accurate and convenient to measure the temperature of the switch contact and then completely eliminate major accidents caused by switch temperature rise.
Simulation of Grid Low Frequency Oscillation Based on MATLAB
Authors: Gou Xin Ke , Qian Bin , Bai Run Qing
Published: April 2014

This paper describes the generation of low frequency oscillations and suppression methods briefly. Observing a phenomenon of low frequency oscillation of Gansu Grid Power and analysis its actual situation. Therefore, we need establish simplified simulation model in MATLAB environment, then do the simulation with the dual power system simulation model which add to power system stabilizer. Simulation results show that: PSS can solve the problem of low frequency oscillations in a region of Gansu steel caused rapid and effective.
The Design of Marine 24 V DC Uninterruptible Power Supply
Authors: Xiao Juan
Published: April 2014

A marine DC uninterruptible power supply is designed. The UPS adopts PIC16C73 single-chip microcomputer to realize the battery management. Both AC power and battery power, the output voltage stability in 23 to 24 v.Via advanced battery management, two sections of charging, equalized charging and floating charging can automatic convert and the DCUPS has many functions of protection, such as over-voltage protection ,under voltage protection and short circuit protection.The actual use on the ship and other occasions showed that the DCUPS is convenient and practical,and is more simple, reliable and longer emergency power supply than the traditional AC-DC uninterruptible power supply management scheme.
Analysis of Electromagnetic Interference in Rectifier and Inverter System
Authors: Ding Qiu Qi , Tao Min , Jia Yun Xiang
Published: April 2014

Aiming at the problem of electromagnetic interference in design and application of electronic rectifier and inverter system, introduces the electromagnetic interference and electromagnetic compatibility characteristics of common circuit, the interference test of rectifier and inverter system, puts forward the products it has produced inhibition method of interference. The test results show that the method can reduce electromagnetic interference system greatly.
Robust High-Gain Observer Approach to State of Charge for Lithium-Ion Batteries of Automated Guided Vehicles
Authors: Yu Sung Hoon , Hyun Chang Ho , Kang Hyo Seok
Published: April 2014

This paper introduces a robust high-gain observer based state of charge (SOC) estimator for lithium-ion batteries of automated guided vehicles (AGV) . The proposed observer scheme enhances the transient response speed and diminishes the effect of uncertainties. Furthermore, it overcomes the perturbation problem, which is caused by high gains since the proposed observer scheme adopts sliding mode control technique. In order to verify the effectiveness of the propose method, the linear RC battery model in ADVISOR is used.
Research and Application for Gap-Type Conductor Tension Stringing Machines
Authors: Chen Zhen , Bai Kun , Wang Jun
Published: April 2014

Gap-type conductor stringing and currently existing conventional tension stringing construction technology are not identical, explore two old wires with a new gap-type conductor, which is two-pulling-one wire stringing construction technology. In this paper two-pulling-one running board is designed and manufactured to meet the stringing construction technology. The experiment results show that the system greatly improves the efficiency of the stringing, at the same time reduces construction costs, saves a lot of manpower and time, ensures the construction period, safely and efficiently completes the construction task.
Discussion the Strategy of Indoor 3D Fine Modeling
Authors: Yang Guo Wei , Xu Jia , Sun Ka
Published: April 2014

The Strategy of Indoor 3D Fine Modeling is discussed in the paper. The element task of data acquisition, image processing and texture mapping are finished though some different tools. Then, three-dimensional visual modeling of a laboratory in Nanchang Hangkong University is realized with the application of the key technologies about modeling. Significantly, the indoor application of virtual reality will be promoted. The influence of model fineness on system operation speed and visual fidelity during the modeling process is tested, and the modeling strategy is proposed.
Fuzzy Evaluation and Modeling of Positioning Error of NC Machine Tool Feed System
Authors: Duan Ming De , Gu Jia Jia , Liu Kang Hua , Ji Xiao Xiao , Wang Yu Ping
Published: April 2014

With the experimental data of positioning precision of high-speed precision NC machine tool, a linear mathematical model of positioning error is established. Based on gray model and Cauchy problem formula, a nonlinear mathematical model is also established. The two models are evaluated by fuzzy comprehensive evaluation method to find the optimal prediction model. Compensated with a selection of positioning error compensation model, the confidence interval of 0.95 of positioning error is less than 3μm, meets the design requirements of the machine tool.
The Fingerprint Identification Technology is Applied to the Application Research of Web Cloud Storage Safety Certification
Authors: Xie Guo Bo , Yao Bing Ying
Published: April 2014

In view of the authentication model based on token and password of traditional web cloud storage easily is forgotten or theft that raise questions about identity theft. This paper proposes a identity authentication scheme of web cloud storage based on fingerprint identification. Using the identity authentication model of fingerprint identification to verify web cloud storage users that satisfy people to the web of cloud storage security, reliability and convenience of the proposed requirements, effectively solve the problem of the resource of unauthorized access. The paper put forward three layers of c/s architecture that effectively improve the flexibility, scalability and efficiency of authentication system. And mixed encryption algorithm is put forward as two-way authentication identity authentication protocol improve system security and realize high transmission of huge amounts of data. Finally through the test and analysis of practical application proves that the security authentication based on fingerprint identification applying in the web cloud storage certification system is feasible.
Research of Relation Design Based on Solid Assembly
Authors: Shan Quan , Chen Yan
Published: April 2014

A bottleneck problem in mechanical productions design is presented in this paper. The fundamental conceptions and problems of relation design should be resolved at present. A method of relation design, which using mate relation constraint and align relation constraint and dimensions equation relation constraint, is putted forward. This way is implemented to mechanical productions relation design.
Study on the Ports Cluster in Region Ports Group
Authors: Xiao Quan Shan , Qu Li Li , Zhang Feng Rong , Xu Xin , Zhao Guo Cheng
Published: April 2014

In order to analyze and cluster the scale and categories among the Bohai ports group accurately and objectively, ports are expected to be divided among categories of regional port cluster. Considering ports scale can be affected by many different factors, and those factors have different organizations and units, so principal component analysis(PCA) was used to standardize those factors’ data and then calculated the standardize matrix. Afterwards, k-means clustering method was used to analyze the standardize matrix, achieving the goal of clustering ports and planing hierarchical ports layout.Finally,the cluster results can make significant guidance for the development of inter-port cooperation.
Research on Development and Prospect of Industrial Robots in China
Authors: Wu Di
Published: April 2014

This paper focuses on the development of the domestic industrial robots. It includes the status of the development, key technologies. It analyzes the current domestic market demand, sales, market characteristics and benefits of industrial robots, through the use of market research data. It summarizes the research progress and development trend of China's industrial robots, from the perspective of domestic and foreign contrasts. It combines the author's own direction of development of scientific knowledge accumulated domestic industrial robots put forward their own ideas and outlook.
Identification and Analysis Restriction Factors of Low-Carbon Residential Industrialization Development
Authors: Qi Bao Ku , Wang Hui Ling , Li Ke Bo
Published: April 2014

This paper summarized out of low-carbon residential industrialization development restriction factors through to organize literature, on this basis, using DEMATEL model to reveal the mutual influence relationship of factors quantitatively. The study result shows that: the failure to form scale economy effect, social participation consciousness is not strong lack of a complete industrial chain of housing industrialization, low-carbon technology innovation motivation and ability of enterprises is insufficient and lack of scientific research input are the key factors restricting the development of low-carbon buildings industrialization. Then putting forward some targeted countermeasures and suggestions based on the analysis result.
Online Pedestrian Tracking with Kalman Filter and Random Ferns
Authors: Qu Zhi Qiang , Tu Dan , Lei Jun
Published: April 2014

Object tracking is one of the most important components in numerous applications of computer vision. Much progress has been made in recent years. The Tracking-Learning-Detection (TLD) algorithm achieves excellent performance on a set of challenging video sequences. However, classical TLD algorithm fails to track non-rigid pedestrian as complicated appearance, varying viewpoints, shape changes and occlusions. In this paper, we follow the TLD and propose a robust KMD framework which consists of the Kalman filter tracker, random ferns pedestrian detector and the pedestrian model. During the tracking process the tracker and detector are complementary: the Kalman filter tracker predicts the motion, the pedestrian detector searches the best-match appearance and the pedestrian model combines performance of both to determine final result and generate new samples for learning. Experimental results show our framework comparatively improves performance for pedestrian tracking in surveillance videos.
Association Degree Optimization Model and Algorithm for the Reconstruction of Cross-Cut Shredded Paper
Authors: Wang Hong , Luo Dan
Published: April 2014

This paper analyzed the reconstruction of cross-cut shredded paper coming from a same printed page, built two association degree optimization models (including edge association degree optimization model and the line space one) based on the characteristics of character information on the edge and line space, and provided the concrete solving process and algorithm for the reconstruction of shredded paper. Moreover, the solving process and algorithm were applied in a reconstruction experiment for pieces of shredded paper from China Undergraduate Mathematical Contest in Modeling (CUMCM 2013B). The results showed that this reconstruction method was effective.
Multi-Fractal Spectrum and their Applications in Metal Fracture Surface Images Feature Extraction
Authors: Chen Jing , Mao Lin
Published: April 2014

Based on Bandelet transform and Multi-fractal, the metal fracture surface image denoising is described in the paper. Using multi-fractal analysis, eight multi-fractal spectrum values which are used as shape characteristic parameter of metal fracture surface are extracted. Experimental results showed that different metal fracture surfaces have different shape characteristics and the same kind of metal fracture surfaces have similar shape characteristics. So the shape characteristic parameter of metal fracture surface can be used to study the fracture surface recognition and as the sample of failure analysis.
Based on the Hamilton Improved Circle of Scraps Joining Together
Authors: Zhang Chao Wei
Published: April 2014

By using Hamilton improved circle, transversely and longitudinally cut up paper join together. By scanning image and image extraction techniques, the images of shredded paper are obtained. The process of shredding splicing is mainly divided into two parts, the image preprocessing and edge matching. Then the images conver into grey value matrixes and binarization are implemented on the image with appropriate threshold. The images of shredded paper are classified into nineteen lines. With the shortest Euclidean distance between the edge of shredding and Hamilton improved circle, shredded paper is transversely spliced. The test shows that accuracy is as high as 100%.
A Novel Technique of Error Analysis Based on Test Case Combination
Authors: Guo Xi
Published: April 2014

Based on the model and feature of combination testing, a novel technique of fault analysis based on combination testing is proposed. The faults of software can be triggered by system parameters and their interaction. The result of combination testing is analyzed, and discovered the possible reasons, and then generates an additional test cased which involved from the test case causing the fault, and analysis and verify the result. This method can locate the faults in a relative small area, and can simplify the process of software debugging and testing.
Rolling Bearing Fault Diagnosis Approach Based on PPCA Denoising and Cyclic Bispectrum Method
Authors: Jiang Bing Zhen , Xiang Jia Wei
Published: April 2014

A new method for bearing fault diagnosis is proposed based on Probabilistic Principal Component Analysis (PPCA) and Cyclic Bispectrum (CB). The first procedure is signal de-noised using PPCA and the second procedure is the CB analysis. The effectiveness of the proposed method is demonstrated by numerical simulation and experimental investigation of a rolling bearing with outer race fault.
Design and Implementation of Energy Efficiency Testing Platform
Authors: Su Meng , Su Liang He , Hu Hong Jiang
Published: April 2014

In this paper, To the energy efficiency of power adapter as the research target, we analyzed the demand for automated testing, establish safety regulations automated test system based on LabVIEW. We will use open, modular design and flexible hardware framework, increase the hardware configuration according to customer product testing requirements, and has a good price and versatility. The test process will be automated, the test results will be displayed in real time, and realize the test data storage, analysis and print. By establishing automates of the entire testing process, greatly saving time and reducing test engineers labor costs, and improve the testing laboratory automation and testing reliability.
Engine Fault Diagnosis Based on Improved BP Neural Network with Conjugate Gradient
Authors: Yao Zhu Ting , Pan Hong Xia
Published: April 2014

As a typical reciprocating engine power machinery, complex structure determines its failure brings about the complexity and diversity, it shows the uncertainties of operating environment, system noise and sensor accuracy, and engine fault diagnosis accuracy rate is reduced, taking into account the limitations of traditional BP neural networks, improved BP algorithms include statistical algorithms, additional momentum method, variable learning rate method and conjugate gradient method are studied. Finally, the engine is as an example, engine fault diagnosis experimental system is set, the vibration signals are measured in the normal state, left one and right six cylinders off the oil and air filter blockage in the load of 2565Nm, and the speed of 1500r/min, 1800r/min and 2200r/min. The test and analysis by comparing above mentioned methods indicate it is verified the superiority improved BP neural network with the conjugate gradient method.
Study on Some New Properties of k-Circulant Matrices
Authors: Mei Ying
Published: April 2014

In this paper, we investigate the structure ofk-circulant matrices, and then present some new properties ofk-circulant matrices.
One Point Detection Method of a Rotary Kiln Axis and its Wireless Sensor Receiving System
Authors: Li Zhi Gang , Wang Jian
Published: April 2014

Measurement device for rotary kiln axis demands high positioning accuracy, considering the disadvantage of its complex way of measurement and its wired transmission, an on-line measuring method of rotary kiln using the one-point measuring method at each rotary kiln support is put forward. On the basis of it, a wireless transmitting and receiving hardware system is built, and a software is designed to send the information to the PC using the short distance wireless transmission techniques, then the fitting center of the whole axis is formed. The advantages of the method are that measurement and calculation method is simple, and the information transmission is fast.
Weld Pool and Keyhole Detection Based on Visual Sensors in Plasma Arc Welding
Authors: Ren Wen Jian , Liu Xin Feng , Gao Jin Qiang
Published: April 2014

An observation system is developed with three ordinary industrial CCD cameras to capture the images of the weld pool and the keyhole. Experiments are conducted to evaluate the affecting relationship between welding parameters (welding current and welding speed) and the size of weld pool and keyhole. The observation results lay foundation to understand the weld pool and the keyhole behavior in PAW process and to design the future control system.
Research on Radial Basis Function Network Application in Steel Truss Girder Bridge Damage Identification
Authors: Wang Zhong Hui
Published: April 2014

Damage alarm is an important step among structure damage identification. Its objective is to evaluate the structure health. the existing damage alarm methods are mostly based on BPNN without thinking over testing noise. Therefore, a new method based on hybrid algorithm RBFNN is proposed for structure damage alarm system in this paper. The experiment results of steel truss girder bridge show that the new method is better than BPNN for structural damage alarm.
Low-Latency MAC (LL-MAC) Protocol for a Multi-Hop Wireless Sensor Networks
Authors: Kim Seong Cheol
Published: April 2014

In this paper, we present a new MAC protocol, called Low-Latency MAC (LL-MAC) protocol for muti-hop Wireless Sensor Networks. The LL-MAC is designed for the object tracking applications such as animal invasion, flight detection and wild animal detection. In these applications, the object appearance event does not occur frequently. But when an event occurs, many measured data by sensor nodes should be sent to a sink node as soon as possible. LL-MAC uses duty cycling contention-based MAC protocol. The operational cycle is divided into four periods: Sync, carrier sensing, Data, and Sleep. The Sleep period will be increased to send more packets by sender node when a target object appearance occurs. And a status bit in PION packet is used to indicate target appearance by the sender node. If this status bit is set to 1, all nodes know an object appearance and adjust their Sleep period to two times longer. After sending data packets, the sender node goes into sleep mode and wake ups again in two times slot times to send more data. Results showed that our LL-MAC protocol outperformed other protocols in terms of data packet delivery delay.
Air-Combat Decision Modeling Method Based on DSM
Authors: He Lei , Yao Jian , Lei Yong Lin
Published: April 2014

Air-combat decision modeling in effectiveness simulation has to be concerned with the important feature of decision making, such as complexity, diversity, flexibility. So Several challenges have to be mastered, including: improving the abstract level of modeling, providing friendly modeling language, validating concept model and generated code (or executive model) automatically. In this paper, domain-specific modeling (DSM) method is applied in air-combat decision simulation modeling to cope with those challenges. A graphical and textual domain-specific modeling language (DSML) of air-combat decision is designed through metamodel based on an open source tool, Generic Modeling Environment (GME). A code generator is developed to implement users decision model based on python script.
Symbol Rate Estimation Method for Digital Signal Based on Square Timing
Authors: Wang Wei , Zhang Xiao Yi , Teng Xiao Yun , Hu Yun Peng
Published: April 2014

In this paper, aiming at the poor performance of the existing symbol rate estimation methods when SNR is low, we proposed a method based on the timing square which can be simply calculated and applied to MASK/MPSK/MQAM modulated signal, improved the performance of signal symbol rate estimation compared with the existing method. Based on the principle of the timing square, the signal modules were squared to calculate the fourier coefficient modulus corresponding to different sampling ratios. Then the characteristic line was searched in the transform spectrum which contains symbol rate information and obtained an estimation of the symbol rate. The impact of the roll-off factor and the carrier wave was analyzed and solution was proposed in this paper. Simulation results show that the performance of symbol rate estimation of the improved method is better than the original method, the wavelet transform method and the cyclostationary method in low SNR and low roll-off factor environment.
A Flexible Authentication Scheme with Supporting Multiple Granularity of Data Integrity
Authors: Chen Long , Yi Xiao Yin
Published: April 2014

To extend the flexibility of data integrity verification method,adapted to the different verification environment, proposed an improved solution that can support multi-granularity.It organizes files into three kinds of granularity such as data blocks,data sub-blocks and basic-blocks,basic-block realize data gathered to form data sub-block.Sign in the data sub-block,using signature of the sub-block to generate signature of block. Improvement program can achieve the verification of data blocks and sub-blocks. Validation of data block can reduce the data traffic in the validation process,two particle combination can improve the overall efficiency.In the proposed layered merkel hash tree is put forward,the dynamic operation can be supported by the sub-block or the block.Securitycommunication performance analysis show that the improvement program is effective and has a better practicability
A Method of Heterogeneous Data Integration Based on SOA
Authors: Shuai Wen Ming , Fu Xiu Fen
Published: April 2014

With the rapid development of information technology, the growth of heterogeneous Web data and the requirements of access to the Web of data also is growing. In view of this, a method of heterogeneous data integration based on SOA(Service-Oriented Architecture) is proposed. This method combines the technology of middleware and SOA design, using XML and Web services technologies, presents a framework of heterogeneous data integration based on SOA, and introduces the architecture of SOA data integration middleware. Experimental results show that this method reduces the coupling of heterogeneous data integration system effectively, and improves the scalability of the system.
A Web Text De-Noising Algorithm Based on Machine Learning
Authors: Le Xiao Yan
Published: April 2014

The Web has become a huge information resources distributed information space, contains a huge amount of various types of Web documents.Search engine, it is difficult to meet different user requirements for the elaboration of the retrieval results.To noise method, this paper proposes a text first to find out the noise page information, then according to the rules of human interaction way to generate a denoising, finally find and remove the noise, the experiments has been proved this method to be effective on improving the accuracy of classification.
An Approach to the Mining of User Focused Frequent Itemsets Based on Attention
Authors: Liu Jia , Zhang Zhen Ya , Cheng Hong Mei , Fang Qian Sheng
Published: April 2014

Usually, non trivial network visiting behaviors implied in network visiting log can be treated as the frequent itemsets or association rules if data in networking log file are transformed into transaction and technologies on association rule can be used to mine those frequent itemsets which are focused by user or some application. To mine non trivial behaviors of network visiting effectively, an attention based frequent itemsets mining method is proposed in this paper. In our proposed method, properties of users focusing is described as attention set and the early selection model of attention as information filter is referenced in the design of our method. Experimental results show that our proposed method is faster than apriori algorithm on the mining of frequent itemsets which is focused by our attention.
Design and Implementation for the Web of Origami Simulator
Authors: Yang Hsi Hsun , Yin Sheng Kai , Chen Po Yu
Published: April 2014

This study proposed that the origami curriculum can be one of the important educational activities for Grade 1-9 because origami is not only a form of arts, but also possesses the learning functions that involve hand-brain-eye co-ordination and can upgrade learners non-classical logic deduction skills. This study uses Huzitas Axioms and Huzita-Hatori Axioms (HHA) to implement the Web of Origami Simulator (WOOS). WOOS is produced by a computer algebra system (CAS) and it allows users to arbitrarily rotate or zoom origami forms, calculate the length of line segments, calculate area, and measure angles. Moreover, the steps taken can be recorded so that learners can observe the entire process after the activity. WOOSs ultimate objective is to be implemented in the origami or algebra teaching activities of junior and elementary schools.
Multi-Strategy Web Service Discovery for Smart Government
Authors: Du Yun Yun , Qin Xue
Published: April 2014

Semantic Web Service technology is the solution to system integration and business collaboration for smart government which is cross-border and heterogeneous on a large scale. However the tremendous Web services search space caused by the wide range, large scale and complex e-government business systems is one of the great challenges for smart government. The paper focuses on researches about service discovery in e-government business integration for smart government. In accordance with the application environment and the current technical status of e-government, the author proposes a multi-strategy Web service discovery method on the basis of the proposed semantic model. The discovery process comprises three stages: keyword query with semantic enhancement, IO semantic matching and PE semantic matching. Finally similarity calculating method is proposed to evaluate the matching degree of each candidate service for service selection as well as the conclusions.
Research on Software System Framework Based on Software Reused Technology
Authors: Ren Ji Ping , Dang Cui Fang
Published: April 2014

Combining the development tendency and the current situation of information system, this article provides the design idea and structure of new software system based on reused technology and information sharing principle. It also discusses the key elements and problems when the reused technology is applied into practice. It is meaningful for building the structure of the new information software system.
Efficient Space-Time Two Dimensional RAKE Receiver in Asynchronous Cooperative Communications Systems with Full Diversity
Authors: Li Dong Wu , Pei Chang Xing , Meng Yun Liang
Published: April 2014

A high-performance space-time two dimensional RAKE receiving algorithm was proposed in asynchronous cooperative communication system. the transmitting signals were estimated coarsely by traditional space-time rake receiver, then on the basis of that we introduce feedback technology, each multipath signal of transmitted signals was composed by the decision results, and then every multipath component in the received signal can be obtained by eliminating the composed multipath signals from the received signal. Finally, the multipath components were combined by space-time combination and multipath combination rules accordingly, so spatial as well as multipath diversities were achieved. Simulation results show that the new scheme can reduce the bit error rate dramatically compare with traditional space-time RAKE in asynchronous cooperative communication system.
Reconfigurable Publish/Subscribe Middleware for Wireless Sensor Networks
Authors: Dong Biao
Published: April 2014

This paper presented a approach, called LBS, for modeling and implementing the architecture of wireless sensor networks (WSNs) publish/subscribe (Pub/Sub) applications using a local broker subcomponent (LBS) model. Considering the reconfigurability of WSNs applications which was necessary for WSNs middleware, a graph oriented local broker subcomponent (GOLBS) model was defined based on the LBS model by integrated WSNs middleware with Pub/Sub. The analysis indicated that GOLBS provided reconfiguration management and non-predefined dynamic reconfiguration management for WSNs middleware. The results imply that GOLBS can easily be constructed, while ensuring good reconfigurability.
Energy Consumption Balance LEACH Routing Protocol for Wireless Sensor Networks
Authors: Li Zhong Min
Published: April 2014

Energy consumption is an open issue in research field of Wireless Sensor Networks (WSNs). Low Energy Adaptive Clustering Hierarchy (LEACH) protocol is the most additional routing protocol in WSNs. In LEACH, Cluster Head (CH) is selected randomly, not considering any parameter such as node energy, distance, which causes shortening its lifetime while energy consumption is unbalanced in WSNs. In this paper, it proposes a new LEACH-based protocol, energy consumption balance LEACH protocol. Firstly, all nodes are grouped based on their locations, and a CH is elected in every group, which ensures CHs even distribution in the network area. And an important factor selecting CHs, node energy is considered, which further energy consumption in WSNs. The results of simulation show that ECB-LEACH can increase energy efficiency and prolong the network lifetime.
A Topology Identification Algorithm Based on End-to-End Measurement in Wireless Sensor Networks
Authors: Ji Wen Li , Wang Xue Lian
Published: April 2014

Information of topology is significant for network planning and management in the Wireless Sensor Network (WSN). In this paper we propose a topology identification algorithm based on data fusion system in WSN. Firstly, the algorithm got the collections of approximate ancestors of each node according to the information of packet delay and/or packet loss. Secondly, it identifies parent-child relationship of the nodes by calculating the Hamming distance between the current node and approximate ancestors nodes; and infers the topology of the network layer by layer. It use end-to-end measurements and does not incur any additional burden on the network. NS2 simulation results show the high accuracy and efficiency of the proposed algorithm.
Parking Navigation System Based on the Double Signal Double Display Intersection Vehicle Terminal and Automobile Internal Information
Authors: Xi Jian Zhong , Han Cheng Chun
Published: April 2014

In view of more and more complicate driving and parking problems in urban traffic, the parking guidance system are proposed based on a double signal double display intersection vehicle terminal. The system is based on the information interaction between intelligent terminal, vehicle terminal and vehicle of internet, and to introduce the space maze module and automobile internal information, by simulation maze module planning the different target route and its navigation through the intelligent terminal screen, at the same time instant maze module choice and determine the real-time path navigation through the on-board navigator screen, and to improve the accuracy of target navigation. The system will be the target route and real-time route through their channel respectively on the intelligent terminal and vehicle navigation cross presentation, realize the whole process of target parking navigation, or real-time navigation guidance section step by step according to the real-time parking lots, and in order to improve the parking navigation accuracy to provide an effective means of technology.
Research on Evaluation of Urban Road Congestion
Authors: Gao Yi Dan
Published: April 2014

This paper presents an urban road traffic evaluation system from traffic behavior, transport, traffic supply and traffic concept using the analytic hierarchy process techniques. We collect data by distributing questionnaires in Qingdao and determine the congestion evaluation index system after processing the data by factor analysis. The system is designed to emulate human's expertise on specifying four levels of traffic congestion within the urban area. Case analysis shows that our evaluation system is provided for the government to manage urban traffic networks.
A Portable Integrated Ship Monitoring Command System
Authors: Liu Ming , Zhang Huan
Published: April 2014

This paper proposes a novel and efficient method for channel equalization of MIMO- OFDM system. The method utilizes extreme learning machine (ELM), a class of supervised learning algorithms, to achieve fast training and low bit error rates. The numerical simulation results show that the proposed methods significantly outperform traditional feed-forward neural networks based MIMO-OFDM system equalizers in terms of bit error rate performance.
Route Optimization of DGT Based on Improved Genetic Algorithm
Authors: Zhang Tong Jie , Cao Yan , Mu Xiang Wei
Published: April 2014

An improved genetic algorithm for route optimization in DGT is proposed in this paper. In which, method of initial population, cross and mutation are improved to make it more suitable for DGT. It uses a dynamic operator to realize the adaptive adjustment of the parameters. The experimental results show that the improved algorithm overcomes the shortcomings of local optimum and "premature convergence" and improves the search efficiency and adaptability. The proposed algorithm can effectively solve the path optimization problem in DGT in time.
On the Approximately Denjoy Integrals of Fuzzy-Valued Functions
Authors: Shao Ya Bin , Cai Xia Hong
Published: April 2014

In this paper, we give the definitions of approximately derivates, and then define the ap-Denjoy integral of fuzzy valued functions using fuzzy approximate Lusin function and investigate some properties of ap-Denjoy integral.
An Efficient Shape Recognition Method Using Multiple Description Fusion
Authors: Xu Zhen Xing , Wan Yi , Lv Na
Published: April 2014

Shape recognition methods based on one-dimensional global feature Fourier descriptors have been widely used for the computational simplicity and high recognition rate. However, in cases of occlusion, local deformation or other complex degradation this approach shows poor performance. In this paper we present a new shape recognition method with a novel shape similarity metric, which fuses three different metrics, all of which are rotation, translation and scaling invariant. These metrics takes into account the normalized shape variance, phase correlation and modified Fourier descriptor. Experimental results show that the proposed method has high recognition rate even when the object undergoes some shape deformation. When compared with other traditional shape recognition methods, the proposed method demonstrates significantly improved performance.
Analysis of Ground-Based Navigation Signal Coverage on Performance-Based Navigation
Authors: Zhou Ji Hua , Ni Yin
Published: April 2014

The implementation of PBN is an important part of China's civil aviation to enhance national strength program,the evaluation of the ground-based navigation signal Overlay is an essential part of the design of flight procedures.This article start from the principle of electromagnetic wave propagation in the atmosphere and establish a reasonable mathematical model for the propagation of electromagnetic signals,then make use of the secondary development for ArcGIS to complete the evaluation system of Ground-based navigation signal overlay while considering the requirements of DME / DEM update area for 2 DME station.
Statics Analysis of 6-DOF Parallel Robot Based on Screw Theory
Authors: Zeng Xiao Hua , Chen Jia , Peng Li Kun
Published: April 2014

Screw theory was introduced and inducted to the statics analysis and calculation of 6-DOF (Degree of Freedom) parallel robot. Based on the scheme, a 6-DOF parallel robot--hydraulic Stewart test platform was checked specially. The results reveal that, the platform design is appropriate, the analysis procedure is concise and the calculation operation is simple and convenient.
The Study and Implementation of the Anti-Doppler Technology of AUV Communication System
Authors: Dong Ji Gang , Sun Da Jun , Fan Wei Wei
Published: April 2014

Due to the complexity of the underwater acoustic channel, a reliable mobile underwater acoustic communication system must have high resistance to Doppler and multi-path extension. In this paper, an AUV underwater acoustic control and communication system based on frequency-hopping frequency-shift keying (FH-FSK) is proposed. The system uses pulse pair method to estimate Doppler frequency shift, and analyzes the performance of the algorithm via simulation. The system has been developed based on chip OMAP-L138, with lake test conducted. Result of the tests shows that the system can estimate and compensate the Doppler frequency shift generated by the platform's movement precisely, and has strong resistance to interference to transmit AUV control messages effectively.
The Drosophila Imd Signaling Pathway
Authors: Myllymäki Henna , Valanne Susanna , Rämet Mika
Published: April 2014

The fruit fly, Drosophila melanogaster, has helped us to understand how innate immunity is activated. In addition to the Toll receptor and the Toll signaling pathway, the Drosophila immune response is regulated by another evolutionarily conserved signaling cascade, the immune deficiency (Imd) pathway, which activates NF-κB. In fact, the Imd pathway controls the expression of most of the antimicrobial peptides in Drosophila; thus, it is indispensable for normal immunity in flies. In this article, we review the current literature on the Drosophila Imd pathway, with special emphasis on its role in the (patho)physiology of different organs. We discuss the systemic response, as well as local responses, in the epithelial and mucosal surfaces and the nervous system.
Integration of sources in academic writing: A corpus-based study of citation practices in essay writing in two departments at the University of Botswana
Authors: Ramoroka Boitumelo T.
Published: April 2014

The ability to cite sources appropriately is an important feature of academic writing. Academic writers are expected to integrate ideas of others into their texts and take a stance towards the reported material as they develop their arguments. Despite this importance, research has shown that citation presents considerable difficulties for students, particularly non-native English speakers. Such difficulties include using citations effectively in writing and understanding them in reading, expressing one’s voice and signalling citations in writing so that there is a clear distinction between one’s ideas and those derived from source materials. This study investigates the types of reporting verbs used by students to refer to the work of others and the extent to which they evaluate the work of others in their writing. It draws from a corpus of approximately 80 000 words from essays written by students in two departments at the University of Botswana (Botswana). The findings show that students used more informing verbs, associated with the neutral passing of information from the source to the reader, without interpreting the information cited, compared with argumentative verbs (which signify an evaluative role). The results of the study underscore the importance of teaching reporting verbs in the English for academic purposes classroom and making students aware of their evaluative potential.
Temporal- and Location-Specific Alterations of the GABA Recycling System in Mecp2 KO Mouse Brains
Authors: Kang Seok K. , Kim Shin Tae , Johnston Michael V. , Kadam Shilpa D.
Published: April 2014

Rett syndrome (RTT), associated with mutations in methyl-CpG-binding protein 2 (Mecp2), is linked to diverse neurological symptoms such as seizures, motor disabilities, and cognitive impairments. An altered GABAergic system has been proposed as one of many underlying pathologies of progressive neurodegeneration in several RTT studies. This study for the first time investigated the temporal- and location-specific alterations in the expression of γ-amino butyric acid (GABA) transporter 1 (GAT-1), vesicular GABA transporter (vGAT), and glutamic acid decarboxylase 67kD (GAD67) in wild type (WT) and knockout (KO) mice in the Mecp2m1.1Bird/ymouse model of RTT. Immunohistochemistry (IHC) co-labeling of GAT-1 with vGAT identified GABAergic synapses that were quantitated for mid-sagittal sections in the frontal cortex (FC), hippocampal dentate gyrus (DG), and striatum (Str). An age-dependent increase in the expression of synaptic GABA transporters, GAT-1, and vGAT, was observed in the FC and DG in WT brains. Mecp2 KO mice showed a significant alteration in this temporal profile that was location-specific, only in the FC. GAD67-positive cell densities also showed an age-dependent increase in the FC, but a decrease in the DG in WT mice. However, these densities were not significantly altered in the KO mice in the regions examined in this study. Therefore, the significant location-specific downregulation of synaptic GABA transporters in Mecp2 KO brains with unaltered densities of GAD67-positive interneurons may highlight the location-specific synaptic pathophysiology in this model of RTT.
Conjugate Gradient Method for Estimation of Robin Coefficients
Authors: Ma Yan-Bo , Lin Fu-Rong
Published: April 2014

We consider a Robin inverse problem associated with the Laplace equation, which is a severely ill-posed and nonlinear. We formulate the problem as a boundary integral equation, and introduce a functional of the Robin coefficient as a regularisation term. A conjugate gradient method is proposed for solving the consequent regularised nonlinear least squares problem. Numerical examples are presented to illustrate the effectiveness of the proposed method.
Three Iterative Finite Element Methods for the Stationary Smagorinsky Model
Authors: Su Haiyan , Huang Pengzhan , Wen Juan , Feng Xinlong
Published: April 2014

Three iterative stabilised finite element methods based on local Gauss integration are proposed in order to solve the steady two-dimensional Smagorinsky model numerically. The Stokes iterative scheme, the Newton iterative scheme and the Oseen iterative scheme are adopted successively to deal with the nonlinear terms involved. Numerical experiments are carried out to demonstrate their effectiveness. Furthermore, the effect of the parameters Re (the Reynolds number) and δ (the spatial filter radius) on the performance of the iterative numerical results is discussed.