bluuebunny/crossref_metadata_2025 huggingface dataset:
Corrosion Fatigue of Aircraft Aluminum Alloy Structure in the Coastal Environment and Improvements
Authors: Huang Ling Cai , Pan Bo , Jiang Tong Min , Li Mei Jun
Published: June 2010

Corrosion-fatigue failure of aluminum alloy stringer on the tour airplane servicing in the coastal environment of the Fiji Islands was discussed. Through analysis on surface topographies and components of aluminum alloy structure and consideration of service environment, it showed that the chloride ions, the aging failure of structure coating and the applied stress are the main reasons for corrosion fatigue failure of aircraft aluminum alloy structure. The corrosion-fatigue crack propagation rate of structural components in the coastal environment was analyzed by derivation of crack expansion formula. Findings showed that the corrosion-fatigue crack will expand rapidly until the structure fractures after the aircraft aluminum alloy structure operates nearly 10800 cycles during the crack growth phase. According to the corrosion-fatigue failure analysis of aluminum alloy structure, some improvements were proposed to slow down the corrosion-fatigue failure of aluminum alloy structure in the coastal environment.
Acoustic Emission Analysis of Composite Laminates under Low Velocity Impact
Authors: Chen Hao , Tong Xiao Yan , Zheng Xiang , Yao Lei Jiang
Published: June 2010

One of the problems preventing the industrial application of composites is the lack of an efficient method to detect and discriminate among types of damage occurring during service. To solve this problem, low velocity impact experiments are carried out on T300/QY8911 composite laminates. And synchronously, the acoustic emission (AE) technique and impact monitoring systems were used to record the AE signals and the impact force. The damage evolution, damage modes and acoustic emission (AE) activity were easily detected and evaluated by the analysis of both AE waveform and impact load. In this way, the damage development process containing matrix cracking, delamination and fibers breakage is investigated. The energy release of damage are theoretically approximated and correlated with the AE energy. By the theory, the “high energy damage zone” is defined in the scatter diagrams of amplitude-frequency. It is easily to prove that the primary damage mode of “high energy damage zone” is delamination.
Progressive Damage Approach to Simulating Low Velocity Impact Response of Plain Weave C/SiC Composites
Authors: Chen Liu Ding , Tong Xiao Yan , Zheng Xiang , Yao Lei Jiang
Published: June 2010

Based on progressive damage theory, a 3D laminated model with an orthotropic property in plane was established to simulate the response of plain weave carbon fiber reinforced silicon carbide(C/SiC) ceramic matrix composites(CMC) under low velocity impact(LVI). Intra-layer damage and inter-layer damage were taken into account, respectively. Three scalar damage variables, associated with the degradation of warp modulus, weft modulus and shear modulus, respectively, were proposed to characterize intra-layer damage evolutions. The intra-layer constitutive model was implemented into MSC.Dytran, via its user subroutine EXFAIL1. The potential delamination region was considered as a discrete cohesive zone. Three vector spring elements were placed into every two adjacent nodes to simulate the inter-layer joints. A scalar damage variables, associated with the degradation of the three vector spring elements, were brought forward to characterize the inter-layer damage evolutions. The inter-layer constitutive model was implemented into MSC.Dytran, via its user subroutine EXELAS. Damage area, indentation depth of C/SiC composite plates and time history of impact force were obtained to compare with experimental results. The numerical results show overall good agreement with experimental results.
Mechanical System Design of Large Span Retractable Roof
Authors: Yu Ying , Xi Ying , Li Meng Ru
Published: June 2010

Retractable roof becomes popular in recent years because it can make the roof close, open or partly open to meet different purpose. The roof status can be changed according to climate condition outside. It can make people inside feel more comfortable and save energy sometimes. Mechanical system of retractable roof plays a very important role in system safety and reliability. With the experience of retractable roof of Kunshan indoor stadium, design of mechanical driving and supporting system is introduced. Calculation method for key parts and limitation for architecture structure are provided. This paper provides helpful reference for design of mechanical system on retractable roof.
Validity Evaluation of AE Technique on Damage Monitoring of Different Woven C/SiC Composites under Mechanical Loading
Authors: Zheng Jie , Yao Lei Jiang , Zheng Xiang
Published: June 2010

Acoustic emission (AE) technique was utilized for real-time monitoring the damage evolutions of 2-D and 3-D C/SiC ceramic matrix composites (CMC) under mechanical loading. AE signals for damage initiation and propagation were captured by AE equipment during the entire loading process. Different damage mechanisms of the two kinds of C/SiC composites were revealed on the basis of multi-parameter analysis. The experimental results validate the availability of AE technique on damage monitoring of C/SiC composites. And the AE technique can be used to distinguish the slight differences in damage mechanisms during damage evolution owing to different woven structures.
A Theoretical Note on Mode I Crack Kinking and Branching
Authors: Xie Y.J. , Hu Xiao Zhi , Wang X.H.
Published: June 2010

An energy-based fracture mode has been derived for the mode I crack kinking and branching. The classic -integral has been further explored by a new partial integral path and the analytical solution of the energy release rate for crack kinking and branching from a mode-I crack tip has been established. The crack kinking/branching angle has also been analytically derived. It shows that the Griffith’s theorem and conservation law can be applied to both model I crack extension and model I crack kinking and branching. The branching mechanism for quasi-static mode-I crack has been theoretically investigated. The branching toughness and the K-based criterion for crack branching have been defined. The crack branching phenomena predicted by the present model are in well agreement with the experimental observations reported in the literatures.
The Effect of Random Spectrum on the Fatigue Life of Hybrid Metal Matrix Composites
Authors: Wang Yi Qi , Ku Hyoun Kon , Nam Gi Beop , Song Jung I.
Published: June 2010

This research makes comparisons of empirical fatigue-lives between AC8A Al alloy and the metal matrix composites (Al/Al2O3, Al/Al2O3/Al2O3p), and also includes comparisons of fatigue-lives between empirical fatigue-lives and estimated fatigue-lives from regular-periodic load testing, acoustic emission (AE) method to predict fatigue-crack initiation before visible in sight and SEM (Scanning Electron Microscope) photographs of each material. According to the test results of the notched specimen, the fatigue life of the hybrid metal matrix composites and the metal matrix composites, which are more brittle than the base matrix was shorter than that of the base matrix under both types of loads. In addition, the fatigue-life estimated from the damage summation method and that from experiments at random loads were fairly identical.
Availability Research on K-out-of-N: G Systems with Repair Time Omission
Authors: Jia Zhi Yu , Kang Rui , Wang Li Chao , Wang Nai Chao
Published: June 2010

Based on some practical problems in maintenance, a new model for K-out-of-N Markov repairable systems is introduced in this paper. The model focuses on that repair times that are sufficiently short (less than some threshold value) do not affect the system operation. We can say that such a repair time is omitted from the downtime record, and the system can be considered as being operating during this repair time. A model is built in which the threshold value is regarded as a constant at first. And then the model is generalized to allow the threshold value to be a non-negative random variable. Both instantaneous availability and steady-state availability are calculated for these new models as reliability indices. Some numerical examples are presented to verify the validity of these models.
A Novel Variable Neighborhood Genetic Algorithm for Multi-Objective Flexible Job-Shop Scheduling Problems
Authors: Zhang Guo Hui , Gao Liang , Shi Yang
Published: June 2010

Flexible job shop scheduling problem (FJSP) is an important extension of the classical job shop scheduling problem, where the same operation could be processed on more than one machine. It is quite difficult to achieve optimal or near-optimal solutions with single traditional optimization approach because the multi objective FJSP has the high computational complexity. An novel hybrid algorithm combined variable neighborhood search algorithm with genetic algorithm is proposed to solve the multi objective FJSP in this paper. An external memory is adopted to save and update the non-dominated solutions during the optimization process. To evaluate the performance of the proposed hybrid algorithm, benchmark problems are solved. Computational results show that the proposed algorithm is efficient and effective approach for the multi objective FJSP.
Hybrid Genetic Algorithm with Simulated Annealing Based on Best-Fit Strategy for Rectangular Packing Problem
Authors: Zhou Yu Yu , Rao Yun Qing , Zhang Chao Yong , Gao Liang
Published: June 2010

In this paper we address a rectangular packing problem (RPP), which is one of the most difficult NP-complete problems. Borrowing from the respective advantages of the two algorithms, a hybrid of genetic algorithm (GA) and simulated annealing (SA) is developed to solve the RPP. Firstly, we adopt and improve Burke’s best-fit (BF) placement strategy, which is not restricted to the first shape but may search the list for better candidate shapes for placement. Secondly, we propose a new crossover operator, named Improved Precedence Operation Crossover (IPOX), which can preserve the valuable characteristics of the previous generation. At last, using a new temperature and iterations strategy and Boltzmann-type operator, we propose SA to re-intensify search from the promising solutions. The computational results validate the quality and the effectiveness of hybrid algorithm.
Residual Stress Analysis in Curing Process of COG Module
Authors: Wang Liu Bing , Gao Hong , Ma Jian , Chen Xu
Published: June 2010

In this study, the bonding reliability of the COG devices was studied. A finite element analyses model was established to study the curing process of COG module. The equivalent stress of the different locations of the package structure and the change of the temperature distribution with time were studied. The heat transfer process and the conductive particle deformation process were displayed through the simulation. The results show that the curing process is the heat transformation and particle deformation process. The residual stress generated by the temperature difference between the curing temperature and the operated temperature. The results show that the maximum residual stress is in the most distorted places of the conductive particles. The maximum residual thermal stress was studied with different bump pitch (35μm 30μm 25μm and 20μm) and the size of the particles (5μm, 4μm and 3.5μm). It shows that for a certain size of the particles, the maximum residual thermal stress will decrease when the bump pitch decreases. For a certain bump pitch, the maximum residual thermal stress will decrease when the size of the particles decrease.
Finite Element Analysis of a Compressor Disk
Authors: Qian Wen Xue , Xie Li Yang , Yin Xiao Wei
Published: June 2010

Compressor disk is a key rotor part of aeroengines. Alone with the increase of thrust weight ratio of aeroengines, the work conditions of compressor disk are more and more rigor. So the stress level of compressor is very high nowadays. As we know that the stress analysis is a basic of age analysis and reliability analysis, Do a finite element analysis (FEA) is necessary before and after the compressor disks have been made. In this paper, a detail analysis was done with finite element method (FEM), and the stress distribution of disk we got was consistent with the real stress distribution. Also the FEA results show that the location of maximum stress is the failure site of the disk. It is useful work for further work.
The Dynamic Optimization Analysis of High-Speed Hybrid Thrust Bearing
Authors: Sun Kai , Wang Lan , Zhao Xin Jun
Published: June 2010

In this paper, the dynamic characteristics of high-speed hybrid thrust bearing with four-recesses are optimized for different orifice diameter and supply pressure at a given speed condition, the dynamic moment coefficients of hybrid thrust bearing are analyzed, considering the thrust collar angular misalignment case to determine the optimization of orifice diameter and supply pressure under a given speed. The results provide certain reference to the hybrid thrust bearings used in high speed precision spindle.
Statistical Evaluation on Cumulative Damage Property of Aluminum Alloy Welded Joint under Multi-Stage Loading
Authors: Li Wei , Li Qiang , Wang Ping
Published: June 2010

Two-stage loading tests corresponding to high-low loading and low-high loading were performed to clarify the cumulative damage properties of two kinds of aluminum alloy welded joints such as the corner joint and butt joint. As a result, the logarithmic value of cumulative damage can better be characterized by the normal distribution in accordance with the Komogorov-Smirnov goodness of fit test. The proposed linear cumulative damage model can better reflect the scatter characteristic of test data, as well as the newly developed nonlinear cumulative damage model can better characterize the effects of load sequence and load level on fatigue damage value, which was verified with the obtained test data.
Research of Accelerated Reliability Test on Server
Authors: Zhang Xiao Jie , Jiang Tong Min , Wang Dong
Published: June 2010

High-performance computer was developed to address the tight schedule and the high reliability problems. For the 100 trillion times supercomputer Dawning 5000A computing nodes A950r-F server's reliability problems, on the bases of the pre-use investigation and stress analysis of the type, the thesis described the reliability accelerated test of A950r-F server implementation process, and obtained a series of accelerated test data. Accelerated test results from the failure analysis give the corresponding improvement measures by the reliability accelerated test of the A950r-F server. The experiment proved the feasibility and effectiveness of the guidelines.
Research on the Six-Dimension Knowledge Classification System and Model for Modern Product Design
Authors: Ma Xue Fen , Dai Xu Dong
Published: June 2010

Based on the features of distributed knowledge resources environment and taking knowledge mobility in modern design as its supporting goal, this essay focuses on research into knowledge classification systems and representation models of product design. It proposes a six-dimension design knowledge classification system and a cubic knowledge representation model operating in an environment of distributed resources. The six dimensions of design knowledge classification are discipline, product, resource unit, application process, expression pattern, and design domain respectively. Accordingly, the six planes of the cubic knowledge representation model are, therefore, the discipline plane, expression pattern plane, resource unit plane, product plane, application process plane, and design domain plane, clearly represent the application profiles of design knowledge in six dimensions. The six-dimension design knowledge classification system and cubic model are applied to fluid simulation implicit knowledge (expert knowledge) as a real case, and are the basis upon which an application system of fluid emulation expert knowledge service is developed. The design knowledge classification system and representation model proposed in this essay are the theoretical foundations for knowledge flow model development in modern product design and the construction of knowledge management systems for modern design platforms.
Research on Spurious Trip of 1oo2 Safety Instruments of Petrochemical Installation with Repair Considered
Authors: Zhu Jian Xin , Chen Xue Dong , Bao Shi Yi
Published: June 2010

An innovative nuisance trip calculation method based on Markov model was proposed in this paper which was used to evaluate the effect of repairment on system reliability. By analysis of the availabilities of classic 1 out of 2 (1oo2) repairable system, a new definition of spurious trip was put forwarded where online repair was considered. Compared with the benefits obtained by online repairment, the repair-caused-nuisance-trip was analyzed in this paper. Numerical calculation revealed that the online repair is helpful for anti-spurious trip in 1oo2 redundant system. Dangerous failures, if not repaired or cannot be online fixed, have complex influence on system reliability. The dangerous failure is sometimes benefit for anti-spurious performance if it is not repaired. But Mean Time To Failure Spurious (MTTFs) reduces with the increase of dangerous failure provided that dangerous failure rate is bigger than safe failure rate. Meanwhile, the finding that common cause can reduce the chance of nuisance trip was also proposed in this paper, though the influence is too small to be neglected.
Modeling for Time-Variant Reliability of Mechanism
Authors: Zhang Xiao Jin , Xie Li Yang , Wu Ying , Zhang Yu , Zhao Ming Yang , Xu Shi Zhe
Published: June 2010

A novel time-variant reliability model is developed after studying the traditional dynamic performance of mechanism. The expression of reliability is given based on stochastic process. A two-dimensional description of the error generating process is established by studying mechanism output kinematic accuracy. The reliability of mechanism output kinematic accuracy can be obtained according to this description. The model proposed can be used to calculate the reliability of mechanism directly, if the distribution of mechanism output kinematic accuracy is known.
Model and Simulation of Fluid Hydrodynamic Pressure at the Cutting Zone Considering the Surface Roughness
Authors: Li Chang He , Zhou Yan , Cai Guang Qi
Published: June 2010

The theoretical hydrodynamic pressure modeling were presented for flow of coolant fluid through the grinding zone in flood delivery grinding using roughness surface grinding wheel. The simulation results show that the hydrodynamic pressure was proportion to grinding wheel velocity, and inverse proportion to the minimum gap between wheel and work surface and the maximum pressure value was generated just in the minimum gap region in which higher fluid pressure gradient occuring. It can also be concluded the surface roughness of grinding wheel and workpiece makes the contact zone’s hydrodynamic pressure rough and unstable, i.e. the value curve considering roughness is not smooth, leading to the micro-elastohydrodynamic lubrication phenomenon.
Design of an Oblique Tool for the Nano Removal Process
Authors: Pa Pai Shan
Published: June 2010

A system design for a recycling process for the nano removal of the indium tin oxide (ITO) nanostructure from the color filter surface of TFT-LCD displays is presented. The low yield rate of ITO thin-films is well known in semiconductor production processes. By establishing a recycling process for the ultra-precise removal of the thin-film nanostructure, the optoelectronic semiconductor industry can effectively recycle defective products with a reduction of both production costs and pollution. In the current experiment, the major interest lies in the features of the technology and the design of an oblique cathode for the electrochemical removal process. For this process a steep gradient of the oblique cathode provides large discharge mobility and a better removal effect. A thin oblique cathode, a small gap-width between the cathode and the ITO surface, or a high flow rate of electrolyte corresponds to a higher removal rate of the ITO-layer. A large current flow combined with a high feed rate of the display also results in a fast removal rate.
Reliability Analysis of Kinematic Accuracy of a Three Degree-of-Freedom Parallel Manipulator
Authors: Li Bing , Xie Li Yang , Wei Yu Lan , Wu Ying , Zhao Ming Yang , Xu Shi Zhe
Published: June 2010

The reliability of kinematic trajectory of manipulators describes the ability that manipulators keep kinematic accurate. It is an important parameter to evaluate the performance of manipulators. The kinematic accuracy of manipulators can be improved when piezoelectricity material are used as a transducer to suppress the vibration of flexible manipulators. First, a 3 degree-of-freedom parallel manipulator system and its dynamic equations are introduced. The theory and experiment of a vibration suppression system are then presented. The calculation method of both error and reliability of kinematic trajectory of manipulator is further implemented. Finally, the reliability of kinematic accuracy are calculated and analyzed for the 3 degree-of-freedom parallel manipulator with or without vibration suppressing control. The results show that the reliability of kinematic accuracy is improved using vibration suppressing control.
Combinatorial Synthesis and Characterization of Thermoelectric Composition-Spread (La1-xCax)VO3 (0≤x≤1) Films
Authors: Wang Qun Jiao , Xu Min , Zhang Yi Bin
Published: June 2010

La1-xCaxVO3 composition-spread films were fabricated by combinatorial pulsed laser deposition and their thermoelectric properties were evaluated paralelly by the multi-channel thermoelectric measurement system. Concurrent X-ray analysis verified the formation of solid solution films in the full composition range (0≤x≤1) as judged from the linear variation of the lattice constants. The power factor of 0.6 µW/cm K2 was achieved in LaVO3 film at 800°C.Large thermoelectric properties in vanadium oxide system can be expected with the change of vanadium ion valence from 3+ to 2+.
The Research on Bei Jia Zi of Tujia Minority and its Influence on Modern Product Design
Authors: Li Liang Jun , Huang Zhao Hui , Su Wei
Published: June 2010

The artifact, which embodies the culture of the Tujia minority group at the Yangtze River basin, is the directest manifestation of Tujia people's idea of creating and designing tools. Bei Jia Zi is the very typical one of those artifacts. This article investigates the influence of traditional artifacts culture on the sustainable design of modern products, and concludes the crutial design elements affecting modern products from the develpmental trend of current ergonomics, based on the analysis of the emerging background, function and structure of Bei Jia Zi.
The Optimal Maintenance Period for Repairable Product after Warranty Expiration under Renewing Warranty
Authors: Hu Z.Y. , Xie Li Yang
Published: June 2010

A model of the optimal maintenance period for repairable product after warranty expiration under renewing warranty is proposed. In the process to fulfilling warranty, the failures of product within warranty period happen randomly, the replacements of products successively failed with warranty period form a renewing process. Given failure rate of product, the period of fulfilling warranty is function of warranty period. User purchasing a product is considered an investment; the period of fulfilling warranty and the maintenance period after warranty make up the life cycle of product investment. Taking various cost factors into account, making model of the cost rate in life cycle of product investment under renewing warranty, the cost rate is function of maintenance period. Give the failure rate of product is an increasing function, it is derived that there is unique optimal maintenance period minimizing the cost rate. Finally, numerical example is given for illustration.
Numerical Simulation Analysis of Fluid in the Semi-State within the Desulphurization Tower
Authors: Guo Wei Lin , He Chao
Published: June 2010

In this paper, the flow field in the desulphurization tower is studied deeply based on two-fluid model, particle dynamics theory and FLUENT. A numerical simulation analysis of fluid within the desulphurization tower is done and the desulphurization tower is the major equipment in the system. The simulation design and calculations show that the two-fluid model is reasonable to analyze the flow field. The simulation results show that smoke can form good reaction environment within the desulphurization tower. It is meaningful for the further optimization of designing desulphurization tower structure in the circulating fluidized bed system.
Product Data Integration and Management Research Based on XML
Authors: Guo Chen Guang , Liu Yong Xian , Hou Shou Ming , Xie Hua Long
Published: June 2010

Product information technology has been widely applied in manufacturing field, improved the rapid response ability of enterprises to the market demands, and to some extent enhanced the competitiveness of enterprise products. However, product data information generated by different information system has the characteristics of diversification and differentiation. The integration and management of these product heterogeneous data has become the bottleneck which restricts the development of enterprise information technology. Based on XML, this paper researches the integration and management of heterogeneous data, expounds integration structure of heterogeneous data, introduces integration process and schema mapping of heterogeneous data, and realizes schema translation of heterogeneous data. Finally, through the PLM XML schema which is provided by the product life-cycle management software, this paper verifies the integrated management of relational heterogeneous data on Teamcenter.
Modal Analysis on the Truss Structures of Machine Tool
Authors: Yuan Suo Xian , Wen Xue Long , Zhang Yao Man
Published: June 2010

Modal analysis for the truss structures of machine tool is very important. based on ANSYS, according to the truss structures of machine tool, the modal analysis is carried out in this paper. Afterwards, the first ten natural frequency, corresponding mode shape is obtained. By means of animation, ten-order modal vibration rule has been analyzed. The modal analysis is made by ANSYS11.0. It provides the theory for the design and application of truss structures.
A Conceptual Design Approach Generated by Integrating AD and TRIZ into the Conceptual Design Phase of SAPB
Authors: Zhang Xiang , Chen De Zhi
Published: June 2010

This paper analyzes the advantages and shortages of Systematic Approach of Pahl and Beitz (SAPB), Axiomatic Design (AD) and Theory of Inventive Problem Solving (TRIZ), and explores the possibilities of integration of complementary advantages as well. Integrate the Independence Axiom from AD and the principles of resolving contradictions into the conceptual design phase of SAPB, and at last, generate an approach of conceptual design.
Status Quo and Future: Multimedia Application in Higher Education
Authors: Yang Xiao Hui
Published: June 2010

With the development of information technology, multimedia systems have emerged as one of the fastest growing segments in the field of higher education. Multimedia technology used in teaching not only can facilitate the reform of educational modal, also can accelerate the renovation of teaching materials, teaching method and class teaching structure in the field of higher education. This paper discusses the emergence of multimedia, its functions, definition, characteristics and benefits in higher education. Some of the different applications of multimedia in the field of higher education are cited, and the promising future outlook of multimedia is being examined.
A Novel Soil Moisture Predicting Method Based on Artificial Neural Network and Xinanjiang Model
Authors: Xu Jing Wen , Zhao Jun Fang , Zhang Wan Chang , Xu Xiao Xun
Published: June 2010

Soil moisture plays an important role in agricultural drought predicting, therefore there is
an increasing demand for detailed predictions of soil moisture, especially at basin scales. However, so
far soil moisture predictions are usually obtained as a by-product of climate and weather prediction
models coupled with a land surface parameterization scheme, and there has been little dedicated work
to meet this urgent need at basin scales. In order to improve the basin hydrological models’
performance in the soil moisture forecasting, an integrated soil moisture predicting model based on
Artificial Neural Network (ANN) and Xinanjiang model is proposed and presented in this paper. The
performance of the new integrated soil moisture predicting model was tested in the Linyi watershed
with a drainage area of 10040 km2, located in the semi-arid area of the eastern China. The results
suggest that the soil moisture simulated by the integrated ANN-Xinanjiang model is more agree with
the observed ones than that simulated by Xinanjiang, and that the simulated soil moisture by both the
models has the similar trend and temporal change pattern with the observed one.
Perpendicular Error Calibration of Simulation Turntable Using Transformation Matrix
Authors: Qu Zhi Yong , Ye Zheng Mao
Published: June 2010

Many errors including perpendicular error influence the accuracy of simulation turntable, which is a crucial equipment in hardware-in-the-loop simulation system. The aim of this paper is to propose a new method of perpendicular error motion separation of rotating spindle on a simulation turntable. Based on transformation matrix and small angle approximation, gesture transformation matrix with various error items is achieved. As a result of this analysis, perpendicular error analysis is carried out when this measurement result is applied to a simulation turntable. Furthermore, this study also permits the user to know how to minimize some error sources of the simulation turntable.
Local Saddle Points Theory of a New Augmented Lagrangians
Authors: Zhao Wen Ling , Zhang Jing , Zhou Jin Chuan
Published: June 2010

In connection with Problem (P) with both the equality constraints and inequality constraints, we introduce a new augmented lagrangian function. We establish the existence of local saddle point under the weaker sufficient second order condition, discuss the relationships between local optimal solution of the primal problem and local saddle point of the augmented lagrangian function.
Influence of Construction Procedures on the Liner and Stress of a PC Continuous Beam Bridge
Authors: Cheng Hu , Xuan Guo
Published: June 2010

During the construction of a bridge, the construction procedures may change from the originally designed procedures due to some reasons like the weather. In this paper, the influence of construction procedures on the liner and stress is investigated for a prestressed continuous beam bridge with three spans. Finite element analysis indicated that construction procedures have great impact on the liner control and they affect the middle span and side span differently. Although different sets of construction procedures cause different stress at corresponding construction stages after the cantilever construction is finished, they have no significant influence on the stress of the finally built bridge. Test data agreed with finite element analysis. It is thus the influence of construction procedures on bridge liner control should not be neglected.
Development of the Measurement and Analysis System of Nanoparticles Size Distribution
Authors: Li Zhen Mei , Li Wen Ge , Shen Jin , Liu Wei
Published: June 2010

The measurement and analysis system of nanoparticles size distribution was developed by using virtual instrument technology, while the photon counting technology was applied in the system to replace the expensive correlator. High speed photon pulse counter was designed. The real-time data of nanoparticles dynamic light scattering were analyzed in the mixed program of MATLAB and LabVIEW, where the time autocorrelation functions of nanoparticles light scattering signals of monodisperse and polydisperse are reversed by NNLS arithmetic. Experiments results show that the peak position, peak width and symmetry of inverse distribution are very close to the real simulate particles.
Research on Expanded Critical Path Algorithm and its Application
Authors: Chen Guo Lang
Published: June 2010

In the practical applications, there is not only one critical path between nodes in the net. Therefore, it needs to find all critical paths among path selections under other restrictions, and then compare and select optimal or better path in these critical paths. Based on introduction of definition and nature theorem of main critical path, the paper brought out an expanded critical path algorithm in the view of application, which solved the storage problem of duality relation with duality table of net, so as to provide a good basis for determine number of critical path with main critical path algorithm.
Research and Application of a Hidden Line Removal Algorithm of Digital Mine
Authors: Du Xue Dong , Feng Shuang Heng
Published: June 2010

The 3D model of mine transforms into various 2D views with hidden line removal technique, and outputs these 2D views as the standard engineering drawings to guide the production and construction of mine. Due to the complexity and specificity of mine environment, those 2D views that the general blanking algorithms generated have a lot of uncertainties, so they don’t meet the requirements of practical application. In order to meet the requirements of mining applications, according to the characteristics of mine environment, the paper designs and implements a hidden line removal algorithm, and applies it to 2D views automatic generations of digital mine, both the blanking result and accuracy satisfy the requirements of mining applications.
Two-Dimensional Locality Discriminant Preserving Projections for Face Recognition
Authors: Zhang Qi Rong , He Zhong Shi
Published: June 2010

In this paper, we propose a new face recognition approach for image feature extraction named two-dimensional locality discriminant preserving projections (2DLDPP). Two-dimensional locality preserving projections (2DLPP) can direct on 2D image matrixes. So, it can make better recognition rate than locality preserving projection. We investigate its more. The 2DLDPP is to use modified maximizing margin criterion (MMMC) in 2DLPP and set the parameter optimized to maximize the between-class distance while minimize the within-class distance. Extensive experiments are performed on ORL face database and FERET face database. The 2DLDPP method achieves better face recognition performance than PCA, 2DPCA, LPP and 2DLPP.
Attack Algorithm on Watermarking with Public Watermark Detection
Authors: Hu Yan Jun , Yang Lei , Cao Xin De , Wang Guan Jun
Published: June 2010

This paper proposes an attack algorithm for digital image watermarking based on independent component analysis (ICA). The paper gives a briefly introduction about ICA algorithm, and expatiates on the attack algorithm which we proposed. The algorithm uses an auxiliary image to remove the watermark signal from the host image based on blind signal separation technology. The paper also does some experiment to attack the watermark algorithm proposed by I J. Cox. The results show that this attack algorithm not only removes most of the digital watermark information, but also has little effect on the image’s peak signal to noise ratio. The paper also discusses the attack algorithm for different watermark signals and different auxiliary images; the effect of this attack algorithm is feasible.
A Multiphase Level Set Method Based on Total Variation Density Estimation for Image Classification
Authors: Yang Yun , Sui Li Chun , Lin Ying
Published: June 2010

Remotely sensed imagery with high spatial resolution often shows serious intra-class spectral variations and details disturbances. This leads to disadvantages on automatic image classification. To increase accuracy of classification, this paper presents a novel multiphase level set method by an optimization of probability density function(pdf) estimation using Total Variation(TV). Specifically, density estimation method using Total Variation originally from image denoising is introduced to well improve “roughness” of pdf caused by spectral variations and details disturbances. Then, the optimized pdf is used to improve Mansouri’s model so as to alleviate local minimum solutions and to further increase classification accuracy. Evidential experiments on IKONOS, QuickBird-2 satellite imagery have demonstrated that our proposed density estimation method is very effective and robust even if in complex scene. Consequently, the improved multiphase level set model has yielded a great increase in classification accuracy. The classification result is more approaching to that of human vision interpretation.
Improving the Performance of Language Identification System Using Different GMM-Training Approaches
Authors: Li Wei , Kim Dong Ju , Hong Kwang Seok
Published: June 2010

This paper proposed a feasible system for language identification (LID) and designed four different GMM-training approaches to improve the system performance by accuracy recognition rates. In our experiment, we used these model-training approaches to evaluation on the system performance, which utilizes Linear Prediction Cepstrum Coefficients (LPCC) and Gaussian Mixture Model (GMM), rely on a 10-language task. From all the results, we found an optimal approach for training GMM in LID system, which achieves high accuracy of 85.25%, and indicated that different GMM-training approaches have different performances for LID system, but an advisable training method that proposed in our paper can greatly improve the system performance.
Image Segmentation Based on Contextual Label Tree for Retrieval
Authors: Yuan Guo Qiang , Liu He Shan
Published: June 2010

Image segmentation is an important constituent portion in image processing and retrieval. Based on the traditional Wavelet-domain Hidden Markov Tree (HMT) Multi-scale Segmentation method, this paper presents a Contextual Label Tree (CLT) method according to the dependency information between image blocks belong to different scales, including the relation from the father node, the neighbor nodes and the neighbor nodes of the father. This method calculates the maximal similarity using context vectors that exit on every tree node and realizes image segmentation from coarse-scale to fine-scale. Experiments show that this method is satisfied with its segmentation performance.
A Data Mining System Based on the Web Services Technology
Authors: Zhou Xiao Qing , Sun Jia Xiu
Published: June 2010

The open-up data mining system is one of developing directions of the present data mining system. In this paper we have put forward a data mining system based on the Web Services and given an applied example on the basis of analysis of the system. As the Web Services have stronger sealing and their joints are simple, they make the integration of the data mining system more flexible, heightening the working of the mining system.
Study on the Normalization for Internet Computing and Modeling of Conceptual Model XML-Based
Authors: Qiu Wei
Published: June 2010

This document explains and demonstrates on the Normalization for Internet computing
and Modeling of Conceptual Model XML-based. The existing XML conceptual models have their
limitation, largely because the semantic, such as “containment” and “multiple-scope”, could not be
sufficiently described. XUML is a XML conceptual model based on UML. It is independent of
specific XML schema definition language, and puts emphasis on describing relationships between
domain concepts and defining related semantic constrains. XML normalization theory is recently a
research focus, but the existing research outcomes are very complex so they are hard to be understood
by XML designers. The development of database design methodology reveals that it is more effective
to apply normalization theory in conceptual design than that in logical design. By following the
successful approach, the characteristics of XML normal form are represented in XUML. Several
XUML forms are defined, and the normalization based on XUML is investigated. The research on
XML normalization theory further enhances XUML methodology. So we show the process of XML
normalization in XML conceptual model in the paper. And several normalization methods are
introduced. Finally, an example is presented to explain the general application of XML normalization
methods.
Study Routing Metrics Based on OPRM for Wireless Sensor Networks
Authors: Ding Yong
Published: June 2010

Wireless sensor network (WSN) consists of tiny
nodes with sensing, actuating, computation, wireless
communications capabilities. Because of node's limited energy,
the energy control Routing metric is becoming an important
research topic, this paper firstly makes a summary to the
existing routing metrics, accordingly analyzes that it is
deficient to design routing protocols for wireless sensor
networks based existing routing metric. Secondly, finds the
several key characteristics of wireless sensor networks
communication link. Finally, the energy control routing metric
is proposed in the paper and this routing metric is adopted to
improve the traditional directed diffusion routing protocol.
Simulation results show that the optimization transmits power
can reduce lots of power consumptions, which will meet to
industrial requirements.
A Rendezvous-Location Based Multicast Secure Communication in Ad Hoc Networks
Authors: Chiang Tzu Chiang , Lin Hua Yi , Chang Jia Lin
Published: June 2010

Mobile ad-hoc networking (MANET) is a collection of mobile nodes that want to communicate to each others, but has no fixed links like wireless infrastructure networks to provide group applications and services. Therefore we need concern about providing each node with a secure and efficient key management system for dynamically discovering other nodes which can directly communicate with. Due to the network topology of an ad hoc network changes frequently and unpredictable, so the security of multicast routing becomes more challenging than the traditional networks. In this paper, we describe how any users in the multicast group can compose the group keys and propose a hierarchical group key management to securely multicast data from the multicast source to the rest of the multicast members in wireless ad hoc networks. This approach has a hierarchical structure where the group members are partitioned into rendezvous-location based clusters which can reduce the cost of key management. It not only provides the multicast routing information, but also fits the robustness of the wireless networks and reduces the overhead for the security management.
Fast and Low-Complexity Frame-Level Synchronization for Direct-Sequence Transmitted Reference Receivers
Authors: Miao Nie , Zhao Zhang Zhong
Published: June 2010

In this paper ,we proposed and analyzed a frame-level synchronization (FLS) algorithm for the UWB direct-sequnce transmitted-reference (DS-TR) receiver. In DS-TR systems, Symbol-level synchronization is not enough for data modulation , the position of low duty cycle signal in each frame is still unknown. The algorithm which we proposed has a moderate accuracy but a very low complexity and fast synchronization speed compared with conventional approaches requiring subnanosecond-level accuracy. Detailed analysis of the algorithm is carried out based on our in-depth analysis.
Study on Noise Monitoring and Evaluation of Boiler Room
Authors: Zhou Ji Hong , Wang Bin
Published: June 2010

In this paper, We carried a series of actual inspecting, monitoring and evaluation on the north boiler room of Hebei University of Engineering .The results show that: the main source of the noise in the boiler room is not the combustion noise, but the aerodynamic noise generated from the induced draft fan and blower by monitoring and analysis and single-factor evaluation. The sensitive point around the school north boiler room and measuring points in the internal part of the boiler room both exceeded.
Research of Machine Vision System about Robot Soccer Based on the HSV
Authors: Lu Sheng Rong , Guo Huan Long
Published: June 2010

In this paper, including the introduction of image processing and image processing factors influence the discussion, after the RGB image access to the transformation of HSV, mainly through the robot to select the image of the identification process design, completed the capture of a robot A specific color of the entity, after the robot moves to give you accurate basis for the judgment. First of all, the introduction for images on the basis of the relevant knowledge is presented. Second, the image and the image of the divisions are briefly introduced. Third, we proposed the image factors and image processing technology. Fourth, conversion from RGB to HSV model is presented. Finally, we designed the image of the robot to access and identify procedures modular.
The Research for Extension Software Data Structure
Authors: Wu Xiao Mao , Guo Hui Ming , Yu Yong Quan
Published: June 2010

In this paper, we analyze the data structure of design of matter-element model from the level of software design, combined with the features of the common used data structure and matter-element model in Extenics, finally propose a new data structure model, which adapt to computation, reasoning and transformation using matter-element model.
Research on ALA+SPM Rotor Synchronous Motor Direct Torque Control
Authors: Chen Xue Zhen
Published: June 2010

This paper compares the electromagnet torque characteristics of ALA+PM rotor synchronous motor with the conventional permanent magnet motor, the former holds on linearity relationship with the increase of the stator flux linkage, but the later needs restrict condition. The direct electromagnet torque control is the best control method for ALA+PM rotor synchronous motor, but the stator current can increase if the stator flux linkage is bigger or smaller than magnet flux linkage, the maximum torque current percent ampere control method is used to overcome the disadvantage.
Research of Filtering Based on Wavelet De-Noising Method for Revolution-Modulation North-Finder
Authors: Zhao Dun Hui , Han Yong Qiang , Liu Zhi De , Song Chun Lei , Yang De Jun
Published: June 2010

In order to improve the precision of revolution-modulation north-finder, a filtering method based on wavelet de-noising method is studied. The continuous revolution in constant rate is used to modulate the output signals of gyroscopes and accelerometers, and the signals are demodulated by using the integrated method. The filtering method based on wavelet de-noising method is used to filter the signals of gyroscopes. The disturbance is filtered by maximum modulus, whose Lipschitz exponent is bigger than zero. The mean value of non-maximum modulus adjacent to the selected maximum modulus is used to alternate the maximum value. The noise is filtered by soft-thresholding, whose Lipschitz exponent is smaller than zero. The experimental results show the filtering method based on wavelet de-noising method effectively restrains the effect of random drift of gyroscopes and disturbance of system, and improves the precision of the revolution-modulation north-finder.