bluuebunny/crossref_metadata_2025 huggingface dataset:
A New Compensation Method for the Magnetic Interference of Vehicle
Authors: Lv Jun Wei , Yu Zhen Tao , Fan Li Heng
Published: August 2013

It is unavoidable that the geomagnetic field measurement is interfered by the vehicle magnetic field in geomagnetic navigation. In order to improve the measurement accuracy, the magnetic interference of vehicle must be correctly compensated. Based on the ellipse fitting compensation method, a new 3D magnetic interference compensation method is proposed. The proposed method improves the vehicle magnetic interference compensation method from 2D ellipse fitting to 3D ellipsoid fitting by the least square algorithm of ellipsoid restriction, which relaxes the restriction on 2D motion of vehicles. And a computing method of the compensation parameters is proposed to decrease the load of calculation. Finally, the experiment shows that the compensation method can compensate the vehicle 3D magnetic interference efficiently.
Effects of Hard Segment Contents on Dynamic Mechanical Properties of Gap-Based Polyurethane Elastomers
Authors: Ding Hai Qin , Xiao Le Qin , Zhou Wei Liang , He Li Rong , Zhang Huai Long
Published: August 2013

Gap-based polyurethane elastomer (GAPE) with different hard segment contents are synthesized with 44-Diphenylmethane diisocyanate (MDI), 1,4 butylene glycol (BDO) as hard segments and GAP as soft segments. Dynamic mechanical analysis (DMA) is applied to investigated the dynamic mechanical properties and the mechanical properties of GAPE are studied by materials laboratorial instrument. The results show that GAPE-2 with 33 wt% hard segment has better mechanical properties, of which the tensile strength is 11.3MPa and elongation at break is 460.5%.As shown in DMA, T g of GAPE-2 is-18.4°C, and the low-temperature fragility parameter and activation energy of GAPE-2 are lower, 55.6 and 271.0 KJ·mol-1 respectively. Elastomer with good stiffness and flexibility is obtained.
Solving Job Shop Scheduling Problem Based on Employee Availability Constraint
Authors: Ramya G. , Chandrasekaran M.
Published: August 2013

Manufacturing System is enabled with an excellent knowledge on production plan, proper scheduling of machinery process, employee timetabling and labor costs. Heuristic algorithms are developed to bring optimized results in stipulated time with respect to optimum schedule. This article deals with minimizing the maximum completion time (makespan) based on job scheduling and minimization of labor costs based on employee workload with Shuffled Frog Leaping Algorithm and Sheep Flock Heredity Model Algorithm. The labor costs minimization and makespan which is to find a schedule that satisfies the organizations rules, employees preferences, due date and customers. The formulation of assigning workload for employees is concerned with assigning number of employees into a given set of shifts over a fixed period of time and week task. The main problem attempts to minimize labor costs based on performance criteria and assigning the loads equally among all employees. Several local search methods and heuristics algorithms has been proposed in many research on Job shop scheduling. The Results are compared with other heuristics in terms of makespan, idle time and Labor costs the Shuffled Frog Leaping algorithm performs result oriented than other Heuristics Algorithm.
Experimental Investigation of CO2 Separation from Lignite Flue Gases by 100 cm2 Single Molten Carbonate Fuel Cell
Authors: Milewski Jarosław , Bujalski Wojciech , Wołowicz Marcin , Futyma Kamil , Bernat Rafał
Published: August 2013

The paper presents an experimental investigation of using a Molten Carbonate Fuel Cell (MCFC) for reducing CO2 emission from the flue gas of a lignite boiler. The MCFC is placed in the flue gas stream and separates CO2 from the cathode side to the anode side. As a result, a mixture of CO2 and H2O is obtained; from which pure CO2 can be obtained by cryogenic condensation of water and carbon dioxide. The main advantages of this solution are: additional electricity generated, reduced CO2 emissions and higher system efficiency. The results obtained show that the use of an MCFC could reduce CO2 emissions by 90% with over 30% efficiency in additional power generation.
Aerodynamic Heating Numerical Simulation of Terminal-Sensitive Projectile at Deceleration and Despinning Trajectory
Authors: Zhang Jun , Liu Rong Zhong , Guo Rui , Ma Xiao Dong
Published: August 2013

Aero-heating problem severely affects the performance of terminal-sensitive projectile (TSP) when projected out of the carrier capsule by the gunpowder gas at a high speed. In this paper, based on the typical ballistic data and airflow physical parameters at deceleration and despinning trajectory, the aerodynamic thermal characteristics of a TSP was simulated by Fluent, and the transient temperature distributions were obtained under the different flying conditions. Finally, we got stagnation temperatures by the numerical simulations which were similar to those by the engineering evaluation, and demonstrate the effectiveness of the simulation method. The results are valuable to the research of thermal protection and infrared signature of TSP.
Evaluation of Gun Support Structure Using Equivalent Dynamic Approach in Non Linear FEA
Authors: Shukla Sunil , Deshmukh H. S. , Vinaay Patil , Thite A. B.A.
Published: August 2013

Robot Gun structure is an efficient way in which multiple welds can be done simultaneously. However mounting several weld guns on a single structure induces a variety of dynamic loads, especially during movement of the robot arm as it maneuvers to reach the weld locations.The primary idea employed in this paper, is to model those dynamic loads as equivalent G force loads in FEA. This approach will be on the conservative side, and will be saving time and subsequently cost efficient. The approach of the paper is towards creating a standard operating procedure (SOP) when it comes to analysis of such structures, with emphasis on deploying various technical aspects of FEA such as Non Linear Geometry, Multipoint Constraint Contact Algorithm, Multizone meshing .
SPS Method for Manufacturing Carbide Materials
Authors: Jalabadze Nikoloz , Nadaraia Lili , Khundadze Levan
Published: August 2013

Due the rapid heating rate combined with high pressure by the Spark Plasma Sintering (SPS) technologies possible manufacture a wide range of novel materials with exceptional properties that cannot be achieved using conventional sintering techniques. Hard metals are, from a technical point of view, one of the most successful composite materials. An overview of the metallurgical reactions during the SPS sintering process of powder mixtures for the manufacture of hard metals is presented. The relatively complex phase reactions in the multi-component system TiC-Mo-W-Ni are discussed. There were elaborated a new technology for the fabrication of nanocrystalline hard metals of a new class assigned for the production of articles with high different characteristics. Elaborated materials are characterized by high melting temperature, hardness, wear-resistance, and satisfactory strength at high temperature and corrosive resistance. Through the use of developed technology and the appropriate structural condition gives possibility to achieve high physical-mechanical characteristics. Obtaining of composite materials via elaborated technology is available from the corresponding complex compounds and directly consisting elements too. In this case High-temperature Self-propagation Synthesis (SHS) and spark plasma sintering/synthesis (SPS) process are united and during a single operation it is possible to get not only the powder materials but at the same time obtain required details.
Silk Fibroin/Hyaluronic Acid Blend Film with Good Water Stability and Cytocompatibility
Authors: Wang Ling Shuang , Yan Shu Qin , Li Ming Zhong
Published: August 2013

Stimulating cell proliferation is a challenge in the field of silk fibroin-based biomaterials. In this study, silk fibroin/hyaluronic acid blend films were prepared by a casting method using carbodiimide as a cross-linking agent. Carbodiimide induced silk fibroin to form Silk I crystal structure which was not affected by the presence of hyaluronic acid. The films showed high water resistance. In vitro, the performance of these films was assessed by seeding L929 cells. The results indicated that the silk fibroin/hyaluronic acid blend films with the blend ratio of 80/20 and 60/40 promoted cell proliferation compared with the pure silk fibroin or hyaluronic acid film. These results suggest that silk fibroin/hyaluronic acid blend films are water stable and cytocompatible materials which are expected to be useful in biomedical applications.
Continuous SiC Fibre-Reinforced SiC Matrix Composites: An Analysis Based on Patents
Authors: Huang Xue Guang , Li Yao Qi , Zhao Nan , Shi Hui , Yao Xi , Han Yu Shun
Published: August 2013

Over 1800 SiCf/SiC patents have been searched and identified in this work. SiCf/SiC technologies are emerging rapidly from 2005 in China. However, the extremely low proportion of patents owned by companies indicates that more effort and focus on SiCf/SiC are extremely needed to enable industrial application. Statistical results of worldwide patents reveal that the modification of the mechanical properties is the most urgent demand in industry; meanwhile, the analysis results show that the CVI/CVD (chemical vapor infiltration /chemical vapor deposition) method appears promising to enhance the mechanical properties, as well as to improve the thermal conductivity and stability, to lower the costs and to enhance the controllability of the product.
Finite Element Analysis of Stiffness of Steel Plate with a Rectangular Cutout Bonded by Composite Patches
Authors: You Ze Long , Zhang Xiang Ming , Du Kui
Published: August 2013

An ANSYS-based "volume-spring-plate" three-dimensional finite element model is established in this paper to analyze steel plate with a rectangular hole reinforced by double-side bonding patch, in which the plate is simulated by solid45 8-node 3D element, the adhesive layer is simulated by linear elastic spring element combin14, and the patch is simulated by shell element. Relative intensity, relative stiffness and yield load rising rate of a patched steel plate with regard to parameters, such as the patch length, width, the number of patch layer and ply orientation are studied. The results indicate that composite bonded repair can effectively restore the mechanical properties of the structure and improve the service life.
Stiffness Analysis of Steel Plate with a Rectangular Cut out Bonded by Composite Patch
Authors: Zhang Xiang Ming , You Ze Long , Du Kui
Published: August 2013

Based on the features of steel plate with a rectangular cut out bonded by composite patch, a three-dimensional mechanical model for stiffness analysis was developed. The relative stiffness of steel plate with a rectangular cutout before and after bonded composite patches versus intact plate is introduced and investigated. The results indicate that the relative stiffness of the patched plate increases with the patch thickness increasing, but the performance can not be effectively improved depending upon adding patch thickness alone, when patch thickness is more than five layers. The analytical solutions, when patch more than the 4 layers, are in good agreement with the finite element simulations.
The Simulation of the Interaction between SCR and Seabed
Authors: Yang Chao Fan , Huang Wei Ping , Bai Xing Lan , Meng Qing Fei
Published: August 2013

The simulation of the interaction between steel caternary risers (SCRs) and seabed was studied based on beam on elastic foundation theory and the node-spring system foundation mehod for comparison, with the SCR modeled by extensible flexibility cable curve beam. Not only the bottom support and the friction forces were taken into account, but also the damping force of seabed was included in the model of the interaction between SCR and seabed. The results show that compared with using the node-spring system foundation, the effect of the element length of the model on analytical result is insignificant and a longer element could be used for the model, when the beam on elastic foundation model is used. So, the analysis is not time-consuming and the memory requirement is not so large by using the beam on elastic foundation model.
Statistical Analysis of the Factors Effect on the Zinc Coating Thickness
Authors: Vagaská Alena , Gombár Miroslav , Kmec Ján , Michal Peter
Published: August 2013

In order to improve the corrosion resistance of the material EN 355 the thickness of the zinc coating, deposited during the acid zinc plating process at a constant current density 1 A·dm-2, was monitored. The thickness of deposited coating has been investigated as the relationship of physical and chemical factors acting during the galvanic zinc plating, i.e. the electrolyte temperature, electrolyte composition (the amount of zinc, the amount of chloride and boric acid in the electrolyte), the plating time and the size of the voltage. Based on the mathematical-statistical analysis of the obtained data the suitable predicting model was developed for determining the thickness of deposited zinc coating reflecting the technological conditions of the acid zinc plating process.
Developments of Solar Cell Materials and Fabrication Technology and their Effects on Energy Conversion Efficiency
Authors: Yang Yin Dong , Wu Paul , Deng Jason , Barati Mansoor , McLean Alex
Published: August 2013

This paper reviews the present status and future developments of solar cell materials for photovoltaic (PV) application. The solar cell made from different materials, such as silicon with different structures, cadmium telluride (CdTe), gallium arsenide GaAs), copper indium gallium diselenide (CIGS) and polymers are compared in theoretical ability, energy conversion efficiency, production and maintenance costs as well as environmental effects. Several important strategies to improve energy efficiency, such as anti-reflective coating (ARC), multi-junction concentrator and black silicon technique that improve the light-trapping and absorption properties of solar cells, are discussed. The review results show that the most efficient solar cells achieved 50% energy conversion, whereas silicon-based PV cells can reach 27%. Today the market is dominated by crystalline silicon in multi-crystalline and mono-crystalline forms due to it being the second most abundant element on the earths crust, and its nontoxic and environmental-friendly nature compared with other materials. Development of a new process with low cost, high efficiency and environment-friendly nature to produce solar grade silicon is of significant importance for the PV industry.
Research on Testing Technology of CMOS Camera Module
Authors: Sun Shou Lei , Wang Gui Tang , Li Ying Ge , Li Zheng
Published: August 2013

After the completion of the CMOS(Complementary Metal-Oxide-Semiconductor Transistor) camera module assembly,in order to test the image quality of module. In this paper, based on the ISO12233 standard chart proposing a CMOS camera module modulation transfer function MTF (modulation transfer function) of test method, MTF average value calculated for each module with high contrast and grayscale method, and validation processing to detect unqualified imaging module. The results show that MTF detection method used in this paper can quickly and accurately detect the quality camera module, and stable and reliable, playing an important role to found the quality problems and improve the efficiency of production.
The Effect of Diamond Tool Performance Capability on the Quality of Processed Surface
Authors: Arkhipov P.V. , Yanyushkin A.S. , Lobanov D.V. , Petrushin S.I.
Published: August 2013

Issues related to processing modern high-strength composites have been discussed. The reasons for degradation of performance of metallic binder diamond tools in traditional processing are highlighted. Design solutions for practical modernization of general-purpose metal-grinding equipment are offered. Advantages of combined diamond tool processing are defined to provide effective applica
Application of Self-Propagating High-Temperature Synthesis and Mechanoactivating Treatment for Producing Multi-Component Composite Alloying Materials
Authors: Yakovlev V.I. , Sobachkin A.V. , Sitnikov A.A.
Published: August 2013

The work is devoted to the important problem of producing new class powdered materials by mechanically activated self-propagating high-temperature synthesis (SHS). Mechanical activation and SHS technologies are discussed; the method of producing powder mixture for the powder electrode core (wire) is discussed. It was established that introducing hard particles (carbides) into the surface layer by means of arc surfacing with SHS-powdered electrodes increases the wear resistance of the welded layer.
Research and Design of Wireless Video Monitoring
Authors: Wu Xue Li , Li Yu Zhu , Zhang Ying , Wang Bin , Ma Tao
Published: August 2013

Based on the actual situation of Shijiazhuang Yehe irrigated area, firstly has carried on the hardware design of wireless video monitoring system, and then design the monitoring center software to the modular, and discusses the structure of the wireless transport protocol, finally discusses the water conservancy industry monitoring of intelligent image processing. This paper effectively solves the problems of water conservancy industry the widely of Monitory point distribution and the terrain complex difficult to monitor, Achieved the water conservancy industry unattended and real-time monitoring and water resources scheduling.
Adaptive Resource Allocation Algorithm for OFDMA System Based on Ant Colony Algorithm
Authors: Pu Bin
Published: August 2013

This paper has proposed adaptive resources allocative decisions in OFDMA system based on Ant Colony Algorithms.The problem was modeled as finding a minimum cost path in a graph. The antssolution construction was guided by pheromone trail and heuristic information.Due to the unique heuristic searching mechanism of the ant colony algorithm,the proposed algorithm is guaranteed to converge quickly tto an approximately optimal solution.Simulation results show that the performance of the proposed algorithm is close to the optimal solution ,and gains 1-2dB in comparison with the fixed allocation scheme.
Inertia Simulation for Aircraft Braking Hardware-in-the-Loop Simulation
Authors: Li Feng Yu , Li Bo , Jiao Zong Xia
Published: August 2013

In this paper, the aircraft braking simulation platform is implemented to simulate the aircraft translational energy. Considering the disadvantages of conventional facilities with fixed-mass inertia disc, such as discontinuous regulation, one novel aircraft braking simulation platform structure and inertia simulation strategy is proposed. The simulated inertia can be regulated smoothly within a specific range with the proposed method and airplanes with different inertia can be simulated on one simulation platform. Another advantage of the proposed method is that the aerodynamic drag, engine thrust and nose-wheel rolling resistance can be compensated as well. The experiment results verify the proposed method.
The Application of the Polynomial Regression Method in High-Speed Train Seat's Curve Design
Authors: Guo Yun Peng , Song Gui Qiu , Song Fu Yue
Published: August 2013

in order to improve the passengers comfort, the human engineering was used in the high-speed train seats analysis. According to the natural physiological shape, the paper was adopted the polynomial regression method in order to obtain a better kinesiology seat back curve equation. The exterior point penalty function method was adopted to optimize the curve equation. The optimized result showed that the ride comfort was enhanced. The paper used two new mathematic method in ergonomic design, and improved the high-speed seat comfort.
An Improved Iris Localization Algorithm Based on Curve Fitting
Authors: Huang Yi , Zeng Xiao Ping
Published: August 2013

Iris localization is to detect outer-and-inner boundaries of iris in an iris image. In the paper, an improved algorithm was proposed to quickly and effectively locate outer-and-inner boundaries. As for this algorithm, the first is to block an iris image and extract its sub-image blocks which cover pupil; the second is to set a binary threshold of pupil by adopting the method of Maximum Variance between Clusters; the third is to get the value outer-boundary-points of iris, on the basis of gray gradient of key Regions-of-interest; the last is to select some characteristic pixels in regions of interest respectively and fit outer-and-inner boundaries of iris according to curve fitting.
Design of a New Unlock Mechanism for Fuel Tank Catapult
Authors: Wu Qi Jun , Tang Hao Quan , Yuan Yi Yun
Published: August 2013

To reduce the time of the operation for fuel tank catapult, a new pneumatic unlock frame based on slider-crank mechanism has been designed, and a virtual prototype has been established by ProE and ADAMS, the process of unlocking and launch was simulated. The result shows that this catapult can be unlocked rapidly. The time of unlocking and launch is shortened more than 10 times by improving the principle of unlocking mechanism. It only takes less than 3s to attain safety.
Distinguishing Computer Graphics from Natural Images Based on Statistical Characteristics
Authors: Tong Sen Feng , Yang Yu Hao , Xie Yong Jie
Published: August 2013

In this paper, we propose a new discrimination method using image statistical characteristics is proposed which is designed to distinguish natural images from photorealistic computer graphics. Using Benford model as statistical basis, we conclude statistical properties of the MSD (most significant digit) of AC (Alternating Current) coefficients in DCT (Discrete Cosine Transform) domain of natural images and computer graphics, and then we constructed the detection model of the proposed algorithm. Experimental results show that this method can identify natural images and computer graphics effectively, compared with the existing algorithms this method has a higher recognition rate, which comes to 95.22%.
An O(n) Time Algorithm to Find Cubic Subgraph in a Halin Graph
Authors: Lou Ding Jun , Liu Jun Fu
Published: August 2013

The 3-Regular Subgraph Problem is: Given a graph G = (V, E), can we find a subgraph H = (V, E) in G such that for each vertex u in V, , where is the degree of u in H This problem is an NP-complete problem for general graphs. In this paper, we design an O(n) time algorithm to solve The 3-Regular Subgraph Problem for a Halin graph H, where n is the number of vertices of H. Given a Halin graph H, if there is a cubic subgraph G in H, then our algorithm will find G and give an answer Yes, otherwise our algorithm will give an answer No. We also prove the correctness of this algorithm.
A File System Synchronous Algorithm Combining State Transfer and Operation Transfer
Authors: Zeng Sai Feng , Zhu Li Gu , Zhang Lei , Li Qiang
Published: August 2013

In order to realize real-time synchronization of nodes and reduce space overhead by log maintenance in an unstable network, this paper adopts a method that combines the operation transfer-based method and the state transfer-based method. Based on file system synchronization, we design a new synchronous algorithm consisting of the state transform and events merge. the new algorithm can merge file system changes in the millisecond level and realize fast update response. Besides, the new algorithm can accurately identify file update semantics, which can effectively decrease the number of updates operations.
Improvement of Evolutionary Structural Optimization Method for 2-D Model
Authors: Chen Xiao Ming , Lai Xi De , Zhang Xiang , Song Wei , Lu Zhen
Published: August 2013

Which the distortion elements appear in the optimization process and the result may be a partial optimum solution are two disadvantages when using the ESO method to optimize 2-D model. In this paper, two algorithms are proposed for solving these disadvantages. One is filtering and deleting algorithm based on the traits of distortion elements. Using this algorithm, only one parameter is needed to control filtering and deleting, and the parameter is determined by the number of elements linked around distortion elements. The other is interval approximation algorithm. Minimum initial rejection ratio RR0min which fulfills removal criterion was ascertained by using this algorithm and it was used as starting value. Thus other initial erasure rate RR0 were obtained by setting a certain increment. Two algorithms mentioned above were implanted into the existing ESO method. Then optimizing respectively with different initial removal rates which were obtained before and the available structures from the results were filtered out in terms of performance parameters. The results of optimization for 2-D structures indicate that the improved ESO method has better suitability and stability than the existing one, and it avoids shortcoming that the results may be a partial optimum solution when using the existing ESO method.
Decomposition of Reflexive Differential-Difference Polynomial Systems
Authors: Gan Zhi Wang , Zhou Meng
Published: August 2013

This paper presents a zero decomposition algorithm for reflexive difference and differential polynomial systems. The problem of negative exponent of difference operators in DD-polynomials is solved by means of generalized term order. Our algorithm would be used to decompose the zero set of a finitely generated reflexive DD-polynomial set into the union of zero sets of coherent chains.
A Potential Field Model Avoiding Local Minimum in Pedestrian Simulation
Authors: He Liu , Li Xu Hong , Lu Jing
Published: August 2013

For reflecting those behaviors in the simulation that pedestrians choose to wait, scrape or round after being trapped in local minimum, based on the static spatial potential field with big grid, dynamic potential field is obtained after adding in time-consumption potential field and waiting potential field. Time-consumption potential field replaces traditional pedestrian repulsive field and changes with grid space occupancy while waiting potential field has the attribution of attenuation and enhancement together. Simulation experiments are used to verify various selections that pedestrian make when they face different space occupancy. The result shows that this model is not only able to guarantee efficiency and accuracy, but also closer to real walking characteristics.
Bubbling Sort Algorithm Application Based on C Programming Language
Authors: Xiao Xiang Ping
Published: August 2013

As its international status, mastering C programming language is very important, for example the java language, popular and widely used at present, which has all kinds of connections with C programming language. In the C language, the bubbling sort, which has the knowledge of the cycle and array, has been seen as classic examples to explain, and also is used in a variety of computer exams. One important reason is the bubbling sort itself more classic; another is that it is not easy for students to grasp and understand the bubbling sort. This paper will explore a new teaching method--introduction of mathematical thought--to help students to understand and master the bubbling sort.
The Research on the Embedded Vehicle Dynamics Simulation Method
Authors: Zhan Jun , Lu Jiang Li , Xu Liang , Zhang Wei
Published: August 2013

At present, the performance of the vehicle dynamics model is mainly evaluated objectively through offline simulation. In this paper, a vehicle dynamics model was implemented in dSPACE, which was applied to the Automotive Performance Simulator and the preliminary study was made for the realization of the subjective evaluation of the performance of vehicle dynamics model through the real-time closed-loop online simulation. The dSPACE interface library was used to write a Clib program to operate and control the Carsim RT model running on the dSPACE platform, which realized the communication between the external hardware and the real-time hardware of dSPACE.
Li-York Chaos of Set-Valued Discrete Dynamical Systems Based on Semi-Group Actions
Authors: Qian Yun , Guan Peng
Published: August 2013

t is well known that a semi-groups action on a space could appear chaos phenomenon, like Li-York chaos and so on. Li-York chaos has important relations with topological transitivity and periodic point. This study analyzed metric space and its dinduced Hausdorff metric space. Letis a semi-group. We make continuously act on space. We study topological transitivity and betweenand. Some important results are presented which show that if is topological transitivity and periodicity (which means Li-York chaos at the same time), then the action of semi-grouponis Li-York chaos.
In the Wind Tunnel Simulation Defroster Control Study
Authors: Yang Qin Yu , Yao Jin Bo , Yang Yue Ming , Liu Xue Wei
Published: August 2013

Aircraft in flight, such as supercooled water droplets encountered icing conditions suitable for the external environment, the relevant parts of the body will freeze, making the aircraft's aerodynamic performance deterioration, severe endanger flight safety, in addition, the aircraft parked in the open winter months , there will be icing, you need to clean up before takeoff. We should grasp the mechanism of aircraft icing, environmental factors and easy to freeze parts of the body. This paper presents a simulation using the wind tunnel icing device icing wind tunnel simulations can reproduce the real situation of aircraft icing, for guiding practice and got good results.
Research on Tertiary In-Service EFL Teachers Training Mode Based on Network Technology
Authors: Huang Tian E
Published: August 2013

With the development of educational information technology, the traditional training mode cannot meet the requirement of the times. So exploring a new training mode is an imperative necessity. This paper analyzes the feasibility of tertiary in-service EFL teachers online training mode according to the responses from the investigation and interviews, and attempts to prove online training is an effective way for teachers professional development and life-long learning.
The Application of Movie Technology and Virtual Technology in Web-Based Courseware
Authors: Tian Xiao Na , Wang Zheng Hong
Published: August 2013

At present, the design of web-based courseware in distance education is too conservative and lack of innovation, which is mainly due to two reasons: One is the thinking set of courseware designers who are still possessing the mindset of education changes itself, which limits their thought into the field of education; The other one is the designer technical limitations that they are lack of technical skills of other related areas. Through introducing the thought and technologies of movie and virtual reality into education, we try to explore new designs for network courseware.
An Analysis of the File System for Linux
Authors: Wang Cheng Jiong
Published: August 2013

This paper discusses about types of file structures in Linux, points out that EXT2 is the most commonly used file system in Linux, analyzes the disk layout, index point and directory structure of EXT2, and studies the method to access files in EXT2 by name, which makes the access faster and more efficient.
Study on the Key Technology of Personalized Recommendation of Case-Based Reasoning
Authors: Li Fu Liang , Bai Yan Feng , Sun Jie Li
Published: August 2013

The key technology of personalized recommendation based on CBR involves the representation and the organization of case, construction and maintenance of multiple cases library, judging of the similarity of case and methods of retrieval, and the combination of personalized recommendation technology. The four interrelated aspects are the important links to design the personalized recommendation system. This paper studies the key technology of the personalized recommendation system based on CBR.
Effect of Ship's Motion on Wave-Generated Magnetic Field in Marine Magnetic Survey
Authors: Zhu Xing Le , Xiao Chang Han , Yao Zhen Ning
Published: August 2013

The survey ship would be interfered by wave-generated magnetic field in marine survey. The waves magnetic field is difficult to eliminate because it is the signal in low frequency like ships magnetization field. When survey ship sails, the frequency of waves magnetic field would change. It was found that the frequency has a linear relationship with ships speed and varies in sine or cosine with the angle between ships and waves directions. Ocean waves PSD would be compressed and strong noise of low frequency in narrowband turns up when ship sails in the same direction of waves. The frequency band of PSD would be broadened and small interference occurs while ships direction is opposite. A conclusion can be drawn that survey ship should sail reversely with ocean waves in marine magnetic survey, so the magnetic field induced by ocean waves would extend to high frequency and it is better for noise elimination.
Analysis for HFS+ on Windows Platform and its Application in Computer Forensics
Authors: Huang Jun
Published: August 2013

HFS+ is the main file system of Mac OS. With the popularity of Apple computer, more and more security specialists pay attention to the computer forensics in Mac OS. As computer forensics technology on Windows Platforms is quite mature and can pass the limit of authority, when get the HFS+ disk or mirror from Apple computer, we can achieve data manipulation for further computer forensics through analyzing the file system on Windows platform. This paper proposed an efficient method to analyze HFS+ file system on Windows to build directory structure and get the unallocated space. This work is the important beginning of computer forensics in Mac OS.
Research on Risk Management Based on Software Project
Authors: Wang Can , Hou Hong Feng , Xu Chun Ming
Published: August 2013

This paper focuses on risk management in each phase of life circle of software development and intrduces advisable measures for each risk. Secondly, it presents a formula to calculate risk. In the end, we analyze the sensitivity of risk by illustration, through sensitivity analysis can we find the most dependent index which can provide great assisstance.
A Game-Based Survey for Security Issues in Vehicular Ad Hoc Network
Authors: Cheng Tan , Sun Hao , Cao Ning , Li Cheng
Published: August 2013

A rapid growth in the number of vehicles contributes to more and more attention on vehicular ad hoc network (VANET) recently, and ensuring security plays a significant role in maintaining its stable operation. Because of some variable environmental factors, its impossible to evaluate a precise value of packets transmission success rate. To reduce the influence of errors on detection, we develop a novel two-person zero-sum intrusion detection game model for formulating confrontation behavior between intrusion detection system (IDS) and malicious node.
Survey of WLAN Fingerprinting Positioning System
Authors: Chen Ping , Xu Yu Bin , Chen Liang , Deng Zhi An
Published: August 2013

The increasing demand for indoor location based services has motivated the development of various indoor positioning methods. Among them, fingerprinting based positioning system in wireless local area network (WLAN) has been paid more attentions due to its cost effectiveness and relatively high accuracy. This paper investigates various optimization techniques for WLAN fingerprinting positioning comprehensively. The fingerprinting positioning comprises five major steps: Radio Map construction, location clustering, feature extraction, location estimation and tracking. The optimization techniques in these five steps are discussed and finally the future trends are presented.
Software Design of Smart Car Tracking with Camera
Authors: Sun Bao Fa
Published: August 2013

The software design ideas of smart car tracking with camera are described. The following modules are discussed: the main function structure, the initialization of each module, road information collecting module, road information processing module, servo control module and motor control module. The repeated debugging and the real operation of the smart car show that it can accurately collect the road information, control flexibly, run stably, and its velocity reaches 2.2m/s.
Iris Recognition Based on Pulsed Coupled Neural Networks
Authors: Deng Hai Ying , Zhou Dong Ming , Nie Ren Can , Li Xiang , Li Hong Mei
Published: August 2013

Based on Pulsed Coupled Neural Network Model, respectively to study the one-dimensional time series, row time series, column time series will keep some invariance by image migration. To apply this nature in iris recognition field, found that to extraction features using row time series method, which can resist rotation changes between the same samples, and keep enough details to distinguish between different samples. Compared with the traditional iris recognition method which using iris phase structure encoded, the results show that row time series method, is less sensitive for phase, and can resist rotation changes better, is effective.
An Access Check System on Account of Firewall's Rule Conflicts Detection
Authors: Zhang Xing Cheng , Qiu Zhong Pan
Published: August 2013

Cater to the needs of company, we have developed an access check system based on multilevel firewalls which can effectively control the clients' access to the server. Its work flow consists of four steps, namely centralized administration, filling in applications, examining applications and automatically altering firewalls. This system can promote the company's efficiency to the maximum by using minimum human resources.
A Model Predictive Controller of Spacecraft Formation Tracking Based on the Hill Equation
Authors: Wang Yan Kai , Zhang Chong , Zhao Ying Hong
Published: August 2013

Spacecraft formation flying has higher performance, higher reliability and lower costs comparing to the traditional single spacecraft. So it becomes a research hotspot in the field of aerospace in China and abroad over the past decade. This paper focuses on the orbital maintenance control between the following spacecraft and the main spacecraft. On the basis of circular orbit or nearly circular orbit, this paper studied the relative motion of spacecraft formation flying based on the Hill equation without considering the influence of the perturbation factor, when the distance between spacecrafts is close. This paper used the generalized predictive control method to design a controller of spacecraft formation tracking. By using Matlab/Simulink, the simulation results showed that the spacecraft has a good orbit tracking capability and a strong anti-interference ability.
Long Mandarin Spoken Term Detection Using Two-Stage Search
Authors: Zhang Zhen , Xu Ji , Wang Xu Yang , Zhao Qing Wei , Yan Yong Hong
Published: August 2013

For efficient collection of speech recordings, the ability to search for spoken terms in the speech stream is an essential capability. Although the Chinese spoken term detection (STD) does not suffer the out-of-vocabulary (OOV) problem as English, it is still hard to retrieve the long spoken terms which contain four characters or more. In this paper, we details our approach for long Mandarin spoken term detection which combines the search on inverted index produced by speech recognizer and linear scan on syllable confusion network. First, we split the long spoken terms into syllables and search the syllables on the inverted index _le to get the segments which may contain the long spoken terms. Then we use a linear scan algorithm on syllable confusion networks (SCNs). On two Mandarin conversation telephone speech sets, we compare performance using the method proposed with that of the baseline syllable-based systems, and our approach gives satisfying performance gains over the others.
Modeling of Component Arrays via Scenario Driven Approach
Authors: Xu Hui , Zou Hong , Wei Li Hao , Wang Tian
Published: August 2013

The component array is a group of components that implement the same functions but provide different qualities. These component implementations can be switched at runtime for satisfying different user requirements and coping with environment changes. However, the design of component arrays is completely performed by hands of developers, which is complex, time-consuming, error-prone, and is poor at keeping up with the actual runtime conditions. This paper presents a scenario-driven state-based approach to modeling component arrays for satisfying requirements of predictable qualities. The automation of four vital steps of this approach is dependent on the interaction based modeling and state-machine based modeling. The approach is illustrated with UML (Unified Modeling Language) and the demonstration and experimentation are implemented on JEE (Java 2 Platform Enterprise Edition).
A Novel Biased Diversity Ranking Model for Query-Oriented Multi-Document Summarization
Authors: Lei Kai , Zeng Yi Fan
Published: August 2013

Query-oriented multi-document summarization (QMDS) attempts to generate a concise piece of text byextracting sentences from a target document collection, with the aim of not only conveying the key content of that corpus, also, satisfying the information needs expressed by that query. Due to its great applicable value, QMDS has been intensively studied in recent decades. Three properties are supposed crucial for a good summary, i.e., relevance, prestige and low redundancy (orso-called diversity). Unfortunately, most existing work either disregarded the concern of diversity, or handled it with non-optimized heuristics, usually based on greedy sentences election. Inspired by the manifold-ranking process, which deals with query-biased prestige, and DivRank algorithm which captures query-independent diversity ranking, in this paper, we propose a novel biased diversity ranking model, named ManifoldDivRank, for query-sensitive summarization tasks. The top-ranked sentences discovered by our algorithm not only enjoy query-oriented high prestige, more importantly, they are dissimilar with each other. Experimental results on DUC2005and DUC2006 benchmark data sets demonstrate the effectiveness of our proposal.
Mining Information Spreading Based on Users' Retweet Behavior in Twitter
Authors: Xia Rong Ze , Jia Yan , Lin Wang Qun , Li Hu
Published: August 2013

Twitter is one of the largest social networks in the world. People could share contents on it. When we interact with each other, the information spreads. And its users retweet behavior that makes information spread so fast. So there comes an important question: Whats about users retweet behavior Could we simulate information spreading in twitter by retweeting behavior We crawl twitter and mine information spreading based on users retweet behavior in it. Through our dateset, we verify the power-law distribution of the retweet-width and retweet-depth. At the same time, we study the correlation between retweet-width and retweet-depth. Finally, we propose an information spreading model to simulate the information spreading process in twitter and get a good result.
Design of HTS Magnetically Controlled Saturable Reactor
Authors: Dong Hong Da
Published: August 2013

There are many problems for traditional reactive power compensation devices to be applied in the grid, such as discontinuous adjustment, small capacity, complex control and harmonics. This paper aims to study a high temperature superconducting magnetically controlled saturable reactor (HTS MCSR), which has a wide range of stepless adjustment. It has a good application prospect in large scale reactive power compensation devices. Based on research of theory and core structure, a shaped-cylinder core is proposed. By means of calculation of saturable reactor and analysis of algebraic and magnetic circuit model, design of 220V HTS MCSR is finished. Results of normal conductive reactor prototype and simulations verify that the range of inductance adjustment is very wide. Furthermore, conceptual design of 35kV HTS MCSR confirms its reactive power capacity is so large, therefore, it is suitable for high voltage power system.
Research of Current Source Frequency Response Method for Monitoring Transformer Winding Deformation
Authors: Wang Guo Qiang , Zhu Yong Li , Liu Li Peng
Published: August 2013

The frequency response analysis (FRA) is a effective diagnostic method in monitoring the deformation of transformer winding. This paper uses the current sweep-sequency source as the excitation to replace the voltage source in the traditional method.And the frequency response curves can be drawn from the current signal rather than the voltage signal.It can be judged whether there is deformation in the transform winding by comparing the frequency response curves.The method can realize the on-line monitoring and diagnosis for the transformers whose neutral points is grounded directly. The Research Background The safety of transform is the necessary condition for power system operation. As the increasing of power system capacity,the short-circuit current will be bigger than before.Therefore, transformer will take more risk of winding deformation.
A Research into Probabilistic Electricity Load Prediction Based on Demand Response Feature under Smart Grid Environment
Authors: Lu Ning , Liu Ying
Published: August 2013

The construction of grid plays an important role in national economic development, social stability and peoples life. In case that electricity market adopts real time electricity price, users active participation and real time response to electricity price will change the traditional load prediction from rigid forecasting to flexible forecasting which takes electricity demand response into consideration. By using wavelet analysis and error characteristics analysis, the researches into the probabilistic predicting method for demand changes under the real time electricity pricing is carried out. The probabilistic load prediction result shall enable decision makers to better understand the load change range in the future and make more reasonable decision. Meanwhile, it shall provide support to electricity system risk analysis.
A Design of Embedded Digital Photo Frame
Authors: Zhang Ying
Published: August 2013

In order to help the transportation enterprises strengthen their competitiveness, this study proposed a digital photo frame which based on the ARM9 family processor chip S3C2440, Linux operating system and Qt/Embedded, trying to make it different from the traditional frames in terms of function, capacity and operability. It focuses on the hardware circuit and the pivotal part of software which can successfully realize playing many formats of photos like magic lantern by the touch screen and audio files. The result of the experiment shows that the digital photo frame designed in the thesis works steadily, and it is easy to operate as well as it has strong expansibility. By adding some applications to the digital photo frame, it can complete many other functions.
An Application of Unified Power Quality Conditioner for Micro-Grid
Authors: Yu Han Guo , Wan Jian Ru , Liu Ran
Published: August 2013

According to the power quality problems of micro-grid, this paper presents a control program of the Unified Power Quality Conditioner (UPQC) to improve the micro-grid power quality.The shunt side of UPQC is used to eliminate the harmonic current brought by nonlinear load into the micro-grid. And the conditioner series part is used to suppress distributed new energy generation intermittence. In the paper synchronous coordinate transformation is used to detect compensated components and tracking control method is adopted to control the converter. The simulation results demonstrate the effectiveness of the UPQC on improving the power quality of the micro-grid.