bluuebunny/crossref_metadata_2025 huggingface dataset:
Research on Integrated and Comprehensive Service System of Operation and Maintenance of Petrochemical Units
Authors: Li Li Sheng , Cai Jia Yu , Hu Xiao Mei
Published: October 2013

In order to realize the goal of one-stop operation service in the petrochemical industry, according to the integrated device operation and maintenance mode of the domestic large and complex petrochemical industry units, integrated and comprehensive service system of operation and maintenance of petrochemical units is designed. Three subsystems of operation and maintenance management, preventive maintenance, maintenance emergency response are designed into an integrated and comprehensive service system. The system has the characteristics of being integrated, open, easy to extend and maintain. The system is developed and implemented in the petrochemical corporation and has a good prospect of application.
Automatic Test Case Generation for Context Based Multiplicity Checking in UML
Authors: Zhou Wei Feng , Li Xin Min , Lv Sheng Qing , Zhang Zhuo
Published: October 2013

UML is considered as the standard for object-oriented modeling and design. Automatic test case generation is an important method for the verification and validation of UML specifications to reduce the development cost and help increase the reliability. In this paper, we present a method to model the specific constraints using context-based multiplicity, which defines on the instances of the class associated with the context, instead of using constraints defined informally or in OCL. Then, an algorithm is proposed to generation a set of test cases to verify the context-based multiplicity in an implementation. The example and implementation for a real system are also presented.
Design of Zongzi Piecework System Based on PLC
Authors: Li Yong Gang , Gong Xun Wei , Yi Shi Qi
Published: October 2013

In the Zongzi manufacturing industry, the traditional Zongzi piecework way not only consumes huge manpower, but also has low efficiency, and prone to error. In this paper, Zongzi piecework system is designed, PLC is adopted as the control center, piecework subsystem and sampling subsystem are developed to implement Zongzi high-speed count and sampling control of multiple production lines in the same time. Practical application shows that the system can greatly improve the speed and precision of Zongzi piecework.
Snapshot Replication Method for Content Data in Social Networking Services
Authors: Li Xin Min , Gu Sheng Hui , Lv Sheng Qing , Xu Xun , Li Wei Min
Published: October 2013

Nowadays, the technology and concept of Web 2.0 have been widely applied, which injects vigor into many traditional web applications. And in vertical social networking services exist many content data, which is one kind of the unstructured data.[ The purpose of the snapshot replication algorithm proposed in the paper is to solve the problem of data inconsistency [in the storage of unstructured data and keep a good balance among capacity, velocity and availability. The experiments show that snapshot replication algorithm combined with replication when referenced algorithm and hard link optimization could perform very well in capacity, velocity and availability.
Study on Application of Domain Ontology in Semantic Information Retrieval
Authors: Yang Huan Hai , Sun Ming Yu
Published: October 2013

Considering weakness of the traditional retrieval method based on keyword matching, the paper introduced semantic into information retrieval, and proposed a semantic retrieval model based on ontology. The paper offered a construction method of domain ontology and implemented semantic reasoning using Jena and improved a semantic similarity calculation method.
Development Trend of Computer Network
Authors: Chen Guo Rong
Published: October 2013

Computer network is originated in the United States in 20th Century 60s, originally used for military communication, gradually enter into the civil, after a short 40 years of continuous development and improvement, has been widely applied in various fields, and is moving forward at high speed. In this paper, the present situation of computer network and the changes on peoples lives, this paper elaborates the development trend of computer network in china.
Network Security Vulnerabilities and Preventive Measures
Authors: Zhang Wen Jie
Published: October 2013

As the arrival times network economy and social networks, computers and computer networks popularity indicates that a ubiquitous network will go into not the state. As the use of network and the virus has become increasingly serious, virus writers from the original to show off to obtain invalid income, the resulting harm is incalculable. This situation not only jeopardize the current development of the Internet but also undermined the reality of social stability and unity, therefore, this paper is on how the network vulnerabilities, how to survive and how to protection, so that there are loopholes in our network deeper understanding of network vulnerability and protection so that we have a new breakthrough for the network to provide a good environment for development.
Anatomy: Uncertain Data k-Anonymity Privacy Protection Algorithm
Authors: Ren Xiangmin , Jia Boxuan , Wang Kechao
Published: October 2013

Uncertain data management has become an important research direction and a hot area of research. This paper proposes an UDAK-anonymity algorithm via anatomy for relational uncertain data. Uncertain data influence matrix based on background knowledge is built in order to describe the influence degree of sensitive attribute and Quasi-identifier (QI) attributes. We use generalization and BK(L,K)-clustering to present equivalent class, L makes sensitive attributes diversity in one equivalent class. Experimental results show that UDAK-anonymity algorithm are utility, effective and efficient, and can make anonymous uncertainty data effectively resist background knowledge attack and homogeneity attack.
A New Virus Source Inference Model Based on Network Performance Estimation
Authors: Zhu Hai Ting , Ding Wei , Ni Jun Hui
Published: October 2013

Combining network tomography, a new virus source inference model based on network performance is proposed. Both the topology information and real time network status are considered in our model. Performance metrics are introduced into rumor-centrality-based source detecting algorithm in an active inference way. By improving the process of setting up the spanning tree of infected topology we raise the virus source inference precision and reduce the time complexity of rumor-centrality-based algorithm from O(N2(|V|+|E|)) to O(N2). The simulation results show that our model achieves better estimation accuracy than the algorithm using rumor center as the estimator.
Failure Analysis of Planetary Gear Shaft of Power Split Device Based on Multi-Body Dynamics
Authors: Liu Yan , Ji Jing Fang , Kong Long , Li Yan , Wang Ji Xin
Published: October 2013

Power split device (PSD) affects the power performance and control strategy of hybrid electric vehicle (HEV). In this paper, a new threshold function for wavelet denoising is used to reduce noise in test torque and rotational speed data. The dynamic simulation is carried out at the moment of planetary gear shaft (PGS) failure, after the rigid-flexible coupled model of PSD is established. According to the obtained stress of PGS, analysis of PGS fracture is verified.
Neighbor-Referencing Cooperative Cache Policy in Content-Centric Network
Authors: Zhang Guo Yin , Tang Bin , Wang Xiang Hui , Wu Yan Xia
Published: October 2013

In-network caching is one of the key aspects of content-centric networks (CCN), while the cache replacement algorithm of LRU does not consider the relation between the cache contents and its neighbor nodes in the cache replacement process, which reduced the efficiency of the cache. In this paper, a Neighbor-Referencing Cooperative Cache Policy (NRCCP) in CCN has been proposed to check whether the neighbors have cached the content. Node will cache the content while none of its neighbors has cached it, therefore reduce redundancy of cached content and increase the variety of contents. Simulation results show that NRCCP has better performance, as the network path had more caching ability and more content popularity densely distributed.
MARank: Algorithm of Microblogging Propagation's Node Influence Evaluation Based on User Authentication
Authors: Wang Lei
Published: October 2013

In resent years,the data mining and analysis of the microblogging has been a hot spot with its vigorous development.In its propagation process, the users’ ranking is generally arranged in out-degree, which cannot reflect the potential forwarding possibility of micro-blogs.To solve this problem, PageRank algorithm was used to present the algorithm of microblogging propagation node influence evaluation based on user authentication,which enables us effectively predict the future ranking of users’ nodes and shows some practical value.
A Simple Hole Filling Algorithm for Binary Cell Images
Authors: Zhao Hang , Chen Zhao Xue
Published: October 2013

Filling holes in binary images is often required during medical image processing and analysis. However, traditional hole filling algorithms for medical images expose some disadvantages such as possible edge degradations and relatively low efficiency. To overcome such limits, a hole filling algorithm for binary cell images based on largest connected region extraction is proposed in this paper. Since there are less pixels for foreground areas in usual binary cell images, the holes in the binary images can be simply filled by extracting & filling the largest connected region in correspondent negative images together with a following OR operation between the obtained result image and the original binary image. Such an algorithm based on largest connected region extraction nearly has no effect on edge information of the ROI(region of interested) with high accuracy and efficiency. The final experiments show its validity and advantage over the traditional morphology methods for hole filling in binary cell images. Thus the presented method is of a considerable reference value for binary image processing.
The Improved AVS Intra Prediction Algorithm
Authors: Li Fu Jiang , Chang Qing
Published: October 2013

AVS introduces intra-prediction coding technique to improve the intra-coding efficiency. There are 5 candidate modes for luminance intra-prediction and 4 candidate modes for chrominance. The method of intra prediction for the current video coding standard mainly uses the pixels of the left, the top, the upper right neighboring blocks, and doesnt use the pixels of the right and bottom blocks. It is not because there is low correlation between the current block and the right and bottom blocks, but the right and bottom blocks need to refer to the data of current block to decode the display. If the mode of the right block is the vertical mode, it can use the data of right block to predict the current block and a new prediction mode of mean-left-right is presented, and if the mode of the bottom block is the horizontal mode, it can use the data of bottom block to predict the current block and a new prediction mode of mean-top-bottom is presented. The corresponding adjustment is implemented for AVS encoder and decoder. Experimental results show that the PSNR increases about 0.03db and the coding bit rate decreases by about0.73% with small complexity increasing.
File Transparent Encryption System Design Based on Security Directory
Authors: Wu Yuan , Chen Xiao Chun
Published: October 2013

Using the Minifilter framework and AES group encryption algorithm, the paper develops a filter driver for encrypting the file of particular types under the security directory. The principle of the file system filter driver is discussed here, and makes a special research about the file operation process especially for word format. This paper also makes a deep analysis of transformation mechanism between the plaintext and ciphertext, and the implementation algorithms of encryption and decryption. Finally, the paper describes the method of path filtering in detail.
The Design of Activity Record in C Language Compile Process
Authors: Song Zhi Chao
Published: October 2013

Activity record is an important part of the compile process. C-based storage management strategy, the system uses the Eclipse integrated environment in Windows 7 system , using the Java language to implement process activity record analysis and processing of the C language. Program can handle variables stored procedure calls and nested execution jumps, and through vector symbol table to achieve compact build management. By applying stack storage management strategies,the storage activity can be clearly demonstrated.
Research on Data Security Technology in Internet of Things
Authors: Zhao Yan Ling
Published: October 2013

The Internet of Things is currently the most popular field of communication and information research directions. Their application in the amount of information involved, are extremely large amount of data. How to ensure the transmission efficiency of business information under the premise of improving networking applications data security to protect the user's privacy data will be particularly important. Paper uses a custom data packet encapsulation mechanism, reducing the overhead of data resources; another based on their cross-platform communication features, combined with secure encryption and decryption, signature and authentication algorithm, the establishment of a secure communication system of things model for the differentiation of things communications environment, providing a standard packet structure, namely smart business security IOT application Protocol intelligent Service Security Application Protocol (ISSAP).
An Improved Model of the Internet Public Opinion Spreading on Mass Emergencies
Authors: Ma Li , Jia Zhong Tian , Sun Hai Yan , Yu Chuan
Published: October 2013

In the WEB2.0 environment, the report of public events will appear on the Internet as soon as they occur and attract a large number of peoples attention in a very short time. It is believed that the Internet public opinion represents the social public opinion. Hence, it is very valuable to study the relationship between the Internet public opinion and mass emergencies. In this paper, we proposed an improved effect model of the Internet public opinion spreading on mass emergencies. Different from the original model, we use variables as the parameters of the equation instead of constants and the whole mass emergency is divided into five stages. In the first two stages, the new participants proportion u(t) and the new leavers proportion v(t) holds the inequality u(t)≥v(t), and in the other stages, they hold u(t)≤v(t). Simulations show that the design of our proposed model can well fit the mass emergency development process.
Design of Flexible Workflow Engine Based on .NET
Authors: Yu Yang , Liu Yuan Ning , Li Meng
Published: October 2013

This paper focuses on the research of the transformation process of workflow engine caused by relevant information changes within the node.This paper describes how to improve the flexibility of the workflow engine from three aspects,that is,adapting to nodes’ internal circuit changes,dealing with nodes’ audit type and quantity changes, and version change processing.
Parasitic Consideration of Package Design within Press Pack IGBT
Authors: Zhang Peng , Han Rong Gang , Liu Wen Guang , Su Ying Ying , Jin Rui , Yu Kun Shan , Liu Jun , Bao Hai Long , Zhang Yu , Che Jia Jie
Published: October 2013

Simulation technology provides a powerful tool for the package design. Parasitic are one of the most important factors for press pack IGBT. By the aid of the simulation software, the package parasitic is extracted and the current distribution among paralleled chips is analyzed. Simulation results confirm the theoretical analysis and verify the efficacy of the new approach.
The Analysis and Simulation of Stream Control Transmission Protocol
Authors: Weng Hui Min , Huang Ming He , Wang Hao , Xu Chang Qiao , Liu Kai
Published: October 2013

Stream Control Transmission Protocol (SCTP) is a new generation of reliable transport layer protocol, unlike TCP, it has new features of multi-homing and multi-streaming, and has good scalability. SCTP is expected to replace TCP as the next generation of universal transport layer protocol. We introduce and analyze the basic structure and features of SCTP, introduce the related research of SCTP, including the implementation method of mobile SCTP and the Concurrent Multipath Transfer mechanism. Finally, compared and analyzed the performance of TCP, SCTP and SCTP-CMT by the ns-2 simulations, results show that in the case of multiple paths are available, the transmission performance of SCTP and SCTP-CMT are both better than TCP.
Relational Database Watermarking Algorithm Based on Comparison Table
Authors: Wang Mei Ting
Published: October 2013

To reduce the algorithm complexity and improve performance, comparison table is created, and then encrypted by a randomized ten-bit serial number. Serial number forms the first key named key1, and the encrypted comparison table forms the second key named key2. Watermarking image is transformed into a binary bit stream. By using tuples primary key, key1 and key2, each tuples unique Id is computed. According to the watermarking length, all tuples are divided into different groups. Using tuple Id, by searching the encrypted comparison table, each tuple group can embed one bit information of watermarking. Robustness and security of this algorithm are tested by experiment.
The Communication Protocol Design and Realization in the Testing System of Communication Devices
Authors: Cao Wen Bin , Niu Gang , Chen Guo Shun , Li Gui Xiong , Yang Qian Kun
Published: October 2013

In order to realize the performance testing and fault diagnosis of communication devices in the Command and Control System, a testing system is proposed. In this paper, a novel communication protocol is developed to realize the communication between the host computer and lower computer of the testing system. As to the different functions of the testing system, the format and sense of the communication messages were introduced in detail. 15 kinds of messages were designed to complete the functions of the open and close of communication serial, data detection ports, the receive and transmission of detection data, the control of the I/O and so on. The communication protocol makes it possible to form the test path and achieve the test of different devices.
Construction of Drought Indices Based on Passive Microwave Remote Sensing AMSR-E Data over Huaihe River Basin
Authors: Xu Jing Wen , Wang Peng , Zhao Jun Fang , Liu Shuang
Published: October 2013

On the basis of previous work, this paper aims to build several proper drought indices based on the basic computation for the band information of passive microwave remote sensing AMSR-E data in Huaihe river basin. Compared with measured soil moisture, optimal drought indices have been selected to explore the spatio-temporal variation laws of drought conditions and its impact factors. The results indicate that there are satisfactory negative correlations between MPDIs (Microwave Polarization Difference Index) and observed soil moisture on the whole, which means the more negative the index is, the more serious the drought will be. Besides, MPDIs at frequency 69GHz and 187GHz calculated by AMSR-E brightness temperature data are much closer to the variation trend of soil moisture than those obtained from other bands.
Soil Moisture Prediction for Huaihe River Basin Using Hydrological Model XXT and TOPMODEL
Authors: Xu Jing Wen , Zhao Jun Fang , Wang Peng , Liu Shuang
Published: October 2013

Soil moisture plays an important role in agricultural drought predicting. Hydrological models can be employed to forecast soil moisture. In order to get better predicted soil moisture information, we use two basin hydrological models, i.e. XXT and TOPMODEL, to forecast the soil moisture for Huaihe River watershed. The performance of both the two models was tested in the Linyi watershed with a drainage area of 10040 km2, a tributary of the Huaihe river, China. The results show that the soil moisture simulated by the XXT is more agree with the observed ones than that simulated by TOPMODE compared to the filed observed soil moisture at 10 cm or the mean ones of 10 cm, 20 com, and 40 cm from surface, and that the predicted soil moisture by both the models has the similar trend and temporal change pattern with the observed one. However, both the models need to be improved in soil moisture forecasting in the future work.
Transformer Fault Diagnosis Study Based on Bayesian Case Library
Authors: Peng Qian , Yan Xiao Hu , Liu Fan , Cao Yong Xing , Zhang Hai Long
Published: October 2013

The transformer fault diagnostic method based on Bayesian case library is proposed in the paper. Firstly, a transformer fault case library is established by collecting standard guideline and expert experience. Secondly, by standardizing the states and fault modes in the case library, the method takes the states as inputs and the fault modes as outputs, which are used to train a naive Bayesian network classifier. When it is necessary for a fault diagnosis, the user is expected to input the fault states in order to finalize the correct fault mode with the help of the well-trained classifier. On this basis, and with the details of the fault mode, the method could help to get the fault diagnosis results of the case. Finally, the feasibility and effectiveness of this developed method is illustrated by a numerical example of transformer fault diagnosis on site.
Research on Pipeline Gas Application System
Authors: Guo Ai Zhang , Liu Guo Ling
Published: October 2013

This paper studied the traditional supervisory control and data acquisition and investigates what is the most important in pipeline gas management system. Then a novel scheme is proposed for remote control interface on pipeline gas providing management. This scheme introduced GPRS and internet network technology to the traditional supervisory control and data acquisition. The details of System topological structure is given and Remote control interface structure are listed. At last, the system performance is analyzed and the results indicate that pipeline gas management system using remote control interface has the excellent protection performance and operability of RCI. It can meet the demand of intelligent home and intelligent building.
Application of Information Technology in Vocational Engineering Training
Authors: Zhang Qiang , He Tao
Published: October 2013

There are so many problems in the traditional teaching practice, information technology teaching has fairly obvious advantages, information technology teaching with Internet as a carrier to spread, Web technology can achieve dynamic interaction, thus providing vivid, content-rich multimedia teaching as possible, in this paper, a system for the management of network teaching system are discussed and research.
Component-Based FPGA Circuit Design and Verification for Robotic Systems Using JavaRock and ORB Engine - A Case Study
Authors: Ohkawa Takeshi , Uetake Daichi , Yokota Takashi , Ootsu Kanemitsu
Published: October 2013

In order to improve flexibility and productivity of designing complex robot systems which consists of a number of sensors, actuators and processors for control, component-based design methodology is a key issue. Meanwhile, an FPGA (Field Programmable Gate Array) is a potential candidate for controlling real-time system like a robot, because it can achieve shorter response time and higher performance-power efficiency by its parallel processing of hardwired digital circuits. However, it is difficult to introduce an FPGA for robot systems because designing an FPGA requires implementation of the user application into a circuit using HDL (Hardware Description Language). In this paper, design and verification flow using a Java-to-HDL synthesizer (JavaRock) and a distributed object environment (ORB Engine) is proposed. A case study of designing an inverted pendulum robot system is described, which achieves below 10 us processing time for controlling the inverted pendulum system successfully within a small FPGA chip in battery operation.
The Agricultural Irrigation District Information System Based on Multi-Agent and GSM
Authors: Zhao Ting Hong , Zhang Peng Fei , Hou Hui Min
Published: October 2013

rrigation district informative construction is an effective way to improve the management and to rational allocate and effectively utility irrigation water resources. This paper is directed against the characteristics such as large-scale monitoring data amount, complex data types, high real-time requirement, strong spatial correlation, etc. combine Multi-Agent theory with irrigation district information system together, and use GSM communication network as the communication network of system, established an agricultural irrigation district information system based on Multi-Agent and GSM, which can full utility intelligent of Agent and the good communication coordination of Multi-Agent system, so to provide comprehensive technical support for irrigation management and decision making.
The Survey on Applications of Information Hiding Technology in E-Commerce Security
Authors: Chai Yan Mei , Zhu Su Wen , Han Wen Ying
Published: October 2013

The booming e-commerce industry is suffering from serious information security problems. As a potential and effective security solution, information hiding technology has been widely applied in many fields and drawn unprecedented attention. Based on our research, this paper provides a survey on the current state of the art information hiding technology, mainly covering the fundamental concepts, basic model, the recent progress of information hiding methods and its applications in e-commerce security sector. At last, possible research and development trends of information hiding technology are discussed.
Study on Torque Characteristic of Novel External Rotor DSPM Generator
Authors: Wang Wei Jun , Liu Hua , Li Bin , Mao Long Bo
Published: October 2013

The external rotor doubly salient permanent magnet (DSPM) generator with PM rotor tooth is designed. The two-dimensional model of the generator is analyzed by finite element method. Without changing the structure of generator, the magnet circuit is kept in the saturated state as soon as possible by paralleling capacitor besides the windings. By comparing the two kinds of rectifier topology structure, the results show that the average electromagnetic torque and the output voltage is significantly enhanced in series multiple rectifier circuit. The torque ripple of generator can be effectively suppressed in the case of load, which has a certain guiding significance for improving the output performance of the generator.
Design of Distributed and Collaborative Agricultural Expert Decision System Based on Smart Phone
Authors: Yuan Hong Bo , Li Li , Wang Hai Hua
Published: October 2013

Agricultural expert consultation and decision system is an important technology for the development of precision agriculture. But current agricultural expert system of consultation and decision is mostly based on static knowledge, and it can not be dynamically updated. The system is low universal and difficult to the rural application. To solve these problems, the smart phone was used as the carrying platform with expert system, which was built together with computer. Smart phone, which embedded with agricultural expert decision system, is a carrying terminal to provide cloud services, communicating with computer and mobile network. All of the management process, greenhouse environment control, expert consultation, diagnosis of disease and other functions can be implemented by this system. The agricultural expert consultation and decision system is distributive, collaborative, portable, universal and dynamic update. It can really be applied to the agricultural production with high benefit.
The Research on C2C E-Commerce Website Using Data Mining Tools to Improve the Network Marketing Effect
Authors: Feng Lu , Wen Zhan Quan , Lin Jie Mei
Published: October 2013

We used the principle of hyperlink analysis method to mine the website data according to the indicators of the hyperlink analysis. We selected Taobao.com as an object of study. The evaluation indicators of network marketing effect were page views, sales quantity, sales, the number of adding store to bookmark . According to our research, we find Taobao.com stores can use data mining tool to obtain the very good marketing effect.
A Numerical Method for Modeling Equivalent Conductivity of Closed-Cell Aluminum Foams Material Based on CST Software
Authors: Dou Long , Chen Bin , Chen Hai Lin
Published: October 2013

A numerical method for modeling equivalent electrical conductivity of closed-cell aluminum foams material based on CST software has been presented. The equivalent electrical conductivity is calculated through summing up the total loss produced in the multicomponent aluminum foams model which has been analyzed by the CST software. The influences of porosity on the electrical conductivities are investigated numerically and the mathematical formulas of the relationship between porosity and conductivity are also shown. The validity of the proposed model was verified through applications of the model in many practical problems, where excellent agreement between measured and calculated results was obtained.
Application of Vega Path Tool in Visual Simulation System for Bridge Cranes
Authors: Dong Ming Xiao , Lu Meng Meng , Li Rui Chuan , Tian Jun Ru , Luo Ren Yu , Jiang Ming Shi
Published: October 2013

Aiming at the path sudden change and inconsistent turning of virtual vehicles in visual simulation system for bridge cranes, forklifts virtual paths are created by using path and navigator modules in Lynx interface based on the application principles of path and navigator in Vega software. Then, forklifts visual paths are edited to ensure the natural and fluent movements of forklifts by choosing spline navigator, setting smaller smoothing threshold and smaller spline tension parameters in Path Tool. Finally, combining working cycle requirements of loading and unloading goods for bridge cranes, continuous motions of several forklifts are realized by calling the path navigation library functions of Vega Software in VC++. Therefore, virtual vehicles complex paths are created and disadvantages of fixed path for virtual vehicles in visual simulation system are solved.
The Application of 3DS MAX in the Designing of the Steel Truss Welding Equipments
Authors: Zhang Dian Ping
Published: October 2013

In this paper introducing the application of the software 3DS MAX in the designing of the truss welding equipments first, in order to state that this kind software not only can illustrate the project of the designing of the complex truss welding equipment well, but it also can demonstrate every movement of the welding equipment directly, and we can amend the project in time, furthermore we can get some references for our designing from this method in the post-design. It is also a good method for designing the general machineries.
Research on Scene Simulation of Buoy Launched Device System
Authors: Pan Guang , Wei Jing
Published: October 2013

For the buoy being launched in the sea, the cost of great number of experiments is very high. It is difficult to get an overall understanding of the process. Aiming at the problems, the visualization of the entire process was realized. Based on Multigen Creator, the three-dimensional models of submarine, buoy, airbag and sleeves were built. Combined simulation program in Vega Prime, the trajectory of the buoy was simulated. In the process of simulation, the viewing angle of the target could be switched for full range of observations. The interaction between users and the simulation system made the relevant person to conveniently and intuitively observe and assess the status of buoys being operated.
The Research on Real-Time Collision Detection of Large-Scale Complex Dynamic Scene
Authors: Zhao Wei , Zhang Ying
Published: October 2013

The rapid real-time collision detection is one of technical difficulties in large-scale simulation of complex dynamic scenes. Complex large-scale real-time scenario, demands of users on the efficiency and the accuracy of collision detection is higher and higher, which has made it become the subject of people to study. Based on the domestic and foreign existing collision detection algorithm, improved the process of collision detection framework, designed and implemented parallel collision detection with method of SIMD technology and multithreading programming, and made combination of these used in the collision detection of complex and dynamic scenes. Experimental results show that the algorithm design made the object in large and complex space of the 3D scene could be achieved real-time simulation. And the method solved the graphic images of moving objects and undetected penetration phenomena, shorten the detection time and response time of the collision for deformation object, increased the realism and immersion.
The Influence Analysis of Geometric Parameters on Piezoelectric Vibration Control
Authors: Shen Chuan Liang , Han Ye , Song Xue Wei , Wang Da Xue
Published: October 2013

The finite element method is adopted to simulate the vibration control effectiveness of autobody thin-walled structure by using the piezoelectric patches. The geometric parameters of thickness and area are chosen as the influence factors to analyze the control effectiveness of piezoelectric vibration control system. The simulation results show that the base metal thickness, piezoelectric patch thickness and the area of piezoelectric patch are main parameters and influence the control effectiveness obviously. The influence rules of these geometric parameters are obtained.
Study on the Generalized Darcy's Law for Bingham and Herschel-Bulkley Fluids
Authors: Cui Jing Wen , Liu Zhi Shang , Zhang Yu Chen
Published: October 2013

Extra-heavy oil, polymer solution and some drilling fluids are typical non-Newtonian Herschel-Bulkley fluids, which behave as sheer-thinning with yield stress. In this paper, the Generalized Darcy's law for Herschel-Bulkley fluids flow in porous media was formulated, by the same way formulating the Generalized Darcy's Law for Bingham fluids. Then, the applications of the two type flow models were compared; Bingham type model was still widely applied due to its conciseness and relatively satisfied accuracy. In addition, the Generalized Darcys Law was revised to describe thixotropic non-Newtonian fluids conceptually.
Adaptive Generalized Predictive Control on Electro Hydraulic Servo Feeding System of Band Saw
Authors: Ni Jing , Xia Zhao Ning
Published: October 2013

In view of the shortcomings of band saw feeding system on position and micro-feeding speed tracking response characteristics, an electro-hydraulic servo feeding system of band saw is designed and its difference mathematical model is presented. Then, a new adaptive generalized predictive controller (AGPC) for the electro-hydraulic servo feeding system is provided. The controller identifies the parameters of the system model by system control input and output on line. Through minimizing performance evaluation function J which is based on j-step ahead predictive output of CARIMA model, system control variable can be got. The simulation and experiment application show that the proposed controller has better position precision and feeding tracking performances than the traditional PID controller and can well address feeding process of band saw.
Study on Compensation Strategy to Eliminate Extraneous Force in Electro-Hydraulic Load Simulator
Authors: Zhao Sha , Zhang Jin Ying , Li Chang Chun , Sun Meng
Published: October 2013

Extraneous force is the main factor impacting the precision and dynamic characteristic of the electro-hydraulic load simulator. The structure and mathematical model of simulator is analyzed . then the improved compensation method based on the structure invariable principle is proposed to eliminate the extraneous force. The method use the velocity signal of the rudder servo system as the feed-forward compensation signal .and the speed signal is reproduced by integrating the given position signal of the rudder servo system. Then use the least square procedure for on-line identification to get tuning phase of the compensation signal. The experimental result show that improved compensation method is efficient obviously.
Design of a Fuze Power Supply to Small Caliber Time Fuze
Authors: Hong Li , Zhang He , Li Hao Jie
Published: October 2013

The modern fuze technology puts forward higher and higher requirements of the fuze power, especially the fast feature of supplying power. Capacitor energy storage power whose energy is from the setter can supply power for fuze before launching the projectile, but its energy is little, so it couldnt satisfy the energy for the fuze work. The turbine alternator can generate power in all the trajectory, so its energy is enough, but it has the hysteresis characteristics of the start-up. This paper puts forward a composite power supply of using two kinds of power supply to solve the requirement of the fast feature of supplying power. Finally, the experiments demonstrate the composite power supply is feasible.
Numerical Well-Testing Model of Fractured-Well in Low Permeability Reservoir Based on Mutative Permeability Effect
Authors: Zhang Yu Chen , Zhou Jiu Ning , Cui Jing Wen
Published: October 2013

At present, threshold pressure gradient method is usually used for describing fluid flow in low-permeability media. However, it is only an approximate approach. In this paper, a 2-D fractured-well model for numerical well-testing considering non-darcy mutative-permeability effect was established, and PSOR iterative algorithm was used for solving the sets of algebraic equations. Based on this model, the typical curves of pressure and pressure derivative were drawn with different sets of parameters. When considering mutative-permeability effect, the pressure derivative curves move upward in each flowing period compared with darcy flowing model. In addition, the range of upward movement is larger as the non-darcy effect is more notable.
Numerical Simulation of Gas-Liquid-Solid Circulating Fluidized Bed (CFB)
Authors: Li Hong Li , Li Yang Dong
Published: October 2013

Through summary of multiphase flow coupling, considerate the conservation of mass and momentum conservation, used the gas phase as a continuous phase, liquid phase and solid phase as dispersed phase, CFB has been simulated with the help of Eulerian model. It show that the local gas holdup increases from the computational domain inlet to the outlet, the local solid holdup decreases from the computational domain inlet to the outlet, and the local liquid holdup decreases from the computational domain inlet to the outlet.
Freezing Technology for Borehole Stability of Gas Drilling
Authors: Wang Zong Gang , Wei Zhen
Published: October 2013

The gas drilling mainly relies on the high speed air flow to carry the cuttings. The formation water or oil mixed with the cuttings and then stick together in clumps after the formation water or oil went into the hole annulus, the clumps stick on the drill string and the borehole. The clumps may block the hole annulus and cause the stick or bury the drill string and many other complex accident. It could stop the cuttings from sticking with the liquid through freezing the formation fluid with the liquid nitrogen. And the natural geotechnical becomes into the frozen soil, and forms the temporary solid which is intact, high strength and low-permeability. This technology could achieve the purpose of strengthening the formation and reducing the fluid flow of the formation, and it greatly broadens the scope of application of gas drilling.
Experimental Study of Optical Glass on Ultrasonic Assisted Grinding Process
Authors: Liu Xin Yu , Hou Li Fen , Zou Ren Ping
Published: October 2013

The mechanism of ultrasonic assisted grinding is presented. Single factor experiment method was used to conduct experiments in order to reveal the effect of different grinding parameters (including feed rate, spindle speed, grinding depth) on surface roughness and grinding force of optical glass in ultrasonic assisted grinding and conventional grinding. The experiment data wss analyzed and it shows that the surface roughness and tangential grinding force decrease while the axial grinding force increase in ultrasonic assisted grinding process than that in conventional grinding process.
Microstructure and Oxygen Functional Groups on Modified Liquefied Wooden Activated Carbon Fibers with Hydrogen Peroxide
Authors: Gao Wei , Zhao Gaungjie
Published: October 2013

The aim of this study is to investigate changes in microstructure and oxygen functional groups of liquefied wood activated carbon fibers using density functional theory, FTIR, X-ray photoelectron spectroscopy. Samples were immersed with hydrogen peroxide (H2O2) at three concentrations (15, 20, and 25 wt%), three temperatures (90, 70, and 50 °C) for three periods of time (1, 2, and 3 h). The results reveals that the pores average radius narrow, and micropores turn into mesopores or macropores with the increasing process, which brings about the surface area of treated samples decrease. Numerous oxygen functional groups are observed in the treated samples, and the ratios of oxygen and carbon increase from 3.2% before treated to 14.7% with H2O2 modification. The results confirm that the average pore radius and surface area decrease during treatment due to concentration and temperature. What is more, oxygen functional groups increase significantly with increasing treatment concentration.
A Novel Tilting Mechanism for Side Discharging Lorry
Authors: Li Peng Zhong , Wang Ran Ran
Published: October 2013

Side discharging lorry is widely used for the transportation of coal and gravels in the coal mine and the highway tunnel. Automatic, safe and efficient tilting mechanism is a challenge for side discharging lorry. Driven by hydraulic cylinders, the tilting mechanism of conventional side discharging lorry needs an additional equipment to coordinate its action,which makes the side discharging lorry more complex and increases the cost. Based on conventional tilting mechanism, a novel tilting mechanism was proposed. The control mechanism, mainly consisted of several connecting rods, can achieving sequential motions of the tilting mechanism. With actual working condition, a mechanism analysis was done to simulate working procedure of the mechanism. The simulation demonstrates the feasibility of proposed mechanical structure for side discharging lorry.
Research of Hollow Cathodic Auxiliary Plasma Nitriding of 38CrMoAl Steel
Authors: Sun De Ping , Lin Cheng Xin , Xu Peng
Published: October 2013

This study has focused on the nitriding of 38CrMoAl steel by hollow cathodic auxiliary plasma nitriding. Nitriding time, temperature and potential of sample were chosen as the influencing factors of orthogonal experimentation. Also, the optimum technological conditions were determined. The testing results showed that the micro hardness of nitriding layer under the best technology of orthogonal experimentation rose noticeably which was 4 to 5 times higher than that of before. Besides, surface roughness of the plasma nitriding sample was as the same as that of before. What is more, there was a 3-μm-thickness white layer in the surface of nitriding sample which comprised ε and γ' phase, and the whole depth of nitriding layer reached 300 μm.
A Study on the Cutting Characteristics and Detection of the Abnormal Tool State in Turning of Ti-6Al-4V ELI
Authors: Shin Hyung Gon , Yoo Seung Hyeon , Park Seon Woo , Hong Dong Pyo
Published: October 2013

The cutting characteristics of biomaterials (Ti-6Al-4V ELI) by tools are investigated with respect to cutting force, work piece surface roughness and tool flank wear by the vision system. Ti-6Al-4V ELI titanium turning is carried out with various cutting conditions; spindle rotational speed and feed rate. Back propagation neural networks (BPNs) are used for detection of tool wear. The input vectors of neural network comprise of spindle rotational speed, feed rates, vision flank wear, and cutting force signals. The output is the tool wear state which is either usable or failure. The detection of the abnormal states using BPNs achieves 97.5% reliability even when the spindle rotational speed and feed rate are changed.
Research on Effect of Scanning Velocity on Laser Cladding AISI 304 Stainless Steel/Al2O3 Composite Coating
Authors: Xu Peng , Lin Cheng Xin , Yi Xin Peng , Zhou Chao Yu
Published: October 2013

AISI 304 stainless steel powder and Al2O3 powder was used to produce laser cladding composite coatings in order to improve the surface wear resistance of 45 steel. Microstructure of the composite coating was examined and analyzed by metallographic microscope. Microhardness and wear resistance of the composite under different scanning velocities were evaluated. The results show that the composite coating is composed of planar crystal, cellular crystal, dendritic crystal and fine equiaxed; the composite coatings under different technological parameters are made of the same phases, ferrite (α) and austenite (γ) phases. Microhardness of the composite is enhanced along with the increase of scanning velocity; effect of scanning velocity on wear loss of the composite coatings is not significant.
Study on Polishing Tool Contact Deformation for Large Robotic Aspheric Surface Compliant Polishing
Authors: Chen Wei , Zhan Jian Ming , Zhang Min Qing
Published: October 2013

Due to the problem of the mutual interaction between the polishing tool system and the control of poses and positions, it is difficult to hybrid-synchronizationally control the polishing force, the posture of polishing tool head and the polishing trajectory. So the article designed a set of compliant tools that take the pneumatic servo system as the control system, which was used for active polishing aspheric surface of Robot. It was to accomplish the Robots self-adaptive control to the posture of the polishing tool as well as to figure out the correlation of the contact deformation between the polishing tool and the work piece surface, which makes a theoretical analysis on dynamic and steady characteristics of the contact deformation of the tool system. It applied the meek and polishing tools to the polishing processing of the rough machining of large aspheric surface samples to obtain the data. According to the statistics, the polishing tools can effectively solve the problem of the mutual interaction between the polishing tool system and the control of poses and positions. It also owns good adaptive ability and its machining aspheric surface quality can achieve nanoscale.
Ballistic Performance of Hybrid Structure Armor against Projectile
Authors: Wang Qun , Yulei Li , Tang Jin Jun , Wang Xing , Jin Xiao Yu , Liu Zi Yu
Published: October 2013

Based on the understanding of material characteristics and interaction between projectile and target, a lightweight hybrid composite armor target consisting of alumina ceramics pellets and ultrahigh molecular weight polyethylene (UHMWPE) was designed and prepared. The target areal density of the armor panel was 7.5 g/cm2. The standard size of the armor panel was 150mm×150mm×43mm. The Ballistic Performance of Alumina/UHMWPE composite armor against an impact of 12.7 mm armor piercing (AP) projectile was investigated at the nominal velocity of 818 m/s. The energy absorbing mechanism revealed that the armor was able to protect against the projectile, together with weight saving.