bluuebunny/crossref_metadata_2025 huggingface dataset:
Automatic Measurement System for Vertical Tank Volume by Electro-Optical Distance-Ranging Method
Authors: Wang Jin Tao , Liu Zi Yong , Zhang Long , Guo Li Gong , Bao Xue Song , Tong Lin
Published: June 2010

The precision measurement of vertical tank volume is one of key problems for the international trade of liquefied petroleum products. One measurement system based on Electro-Optical Distance-Ranging (EODR) principle was proposed. Laser ranging and optic-encoding methods were applied to determine the location of each point on the tank shell. Based on the coordinate computation, the space model of vertical tank was established. Regarded as cylinder, the volume of tank can be calculated by using fitted radius of each course. Weighted Average Method and Direct Iterative Method were used to carry out radius fitting. One comparison experiment was designed, in which one 1000m3 vertical tank was used as test object, and Strapping Method was regarded as reference according to OIML R71. The maximal radius errors of two methods were 2.05mm and 1.48mm, and the absolute value of mean radius errors were 0.97mm and 0.63mm, which verified the system discussed.
Study of Gear Profile Curve Equation for Less-Teeth Gear Transmission
Authors: Wang Bao Ming , Zou Ying Kang , Li Peng , Zhang Guo Hai
Published: June 2010

Due to the shortage of complete design material and mature manufacturing method, less teeth gear (1-7 teeth) transmission has many restrictions in practice nowadays. In this paper, applying the principles of using rack cutter to cut involute gear by using generating methods, we established the dynamic coordinate system and the static coordinate system. By using coordinate transformation method, we derived the equations of gear profile involute and dedendum transition curve. After using Pro/E to plot the end profile of less-teeth gears, we did the 3D modeling and the simulation of the less teeth gear. We also improved a general hobber machine and manufactured less teeth gears successfully. The derivation method of gear profile curve in this paper has lucid concepts which make it quite clear and easy to understand, therefore, it provides theoretical basis to the design, the manufacturing and detection of the less teeth gear.
Analysis of Characters of HSI Color Space and Its Application in Moving Robot
Authors: Wei Jin Ling , Meng Jun , Song Wei
Published: June 2010

According to the analysis of every feature element’s grey images in RGB color space and HSI color space, each of the elements represents different information of the color image. From the analysis of the Histogram of color images, the value range of hue H basically keeps stable, which is proved by experiments to be the most stable and representative one. Finally we illustrated by application instances that the method of recognition and tracking of the objective moving robot based on hue character H is applicable.
The Forming Limits Prediction Model for Tailor Welded Blank with Straight Seam
Authors: Tian Hao Bin , Liu Xiao Hang , Lin Jian Ping , Liu Xian Ping
Published: June 2010

The forming of tailor-welded blank is an important technology to body light weighting. While it is difficult to predict the forming limits of tailor welded blanks with different base materials or thickness. For the expanding experiments, an analytical method to predict forming limit height of tailor-welded blanks is established based on the deformation characteristic and plastic theory, and verified by simulation results. This method is not only provided a path to predict forming limit of tailor welded blanks but also provided references to the design of tailor weld parts.
Design of Red High-Definition NVD Mecha and Vibration Analysis
Authors: Liu Xiang Ming , Wang Yang
Published: June 2010

The problem considered in the paper is the structure design and modal analysis of Mecha in HD-NVD player. Regarding general DVD player, the influence on pickup from structure designs of spindle motor and base, assembly accuracy etc. have already been solved. But for HD-NVD player, as the speed of spindle motor working in the range from 3000 to 7000 r/m, so the these influence on pickup above correlative element have to be solved by complicated analysis. Through using ALGOR to design and analyze Mecha, obtained the structure dimension of base and modal characteristic, found its material property effecting greatly on the vibration of Mecha. With the increase of material rigidity in the base and motor stator, the system rigidity increases, then the vibration of system decreases. The result indicates that the Mecha designed and analyzed by ALGOR can meet the operating demand of HD-NVD player.
3-D Coordinate Determination from 2-D Automotive Sketches: Part II
Authors: Li Qiang , Newman R.M. , Zhang Shuai Feng
Published: June 2010

In this part, the perspective projection has been obtained if one more planar point is given according to the four planar points discussed in Part I. The precision of this reversing transformation has been investigated. The way to obtain four or five points from automotive sketches has been introduced. It has been implemented into a 23D system, and the results are satisfied.
Fire Protection Studies on Steel Staggered-Truss Structure Based on Analytic Hierarchy Process
Authors: Chen Chang Kun , Zhang Dong
Published: June 2010

A new design method for fire protection, based on analytic hierarchy process (AHP), was put forward, to explore an economic and secure strategy for fire protection of steel staggered-truss structure (SSTS). The chords and web members of SSTS were classified into different important grades by AHP according to the influence which components make on the stability of structure at elevated temperature. And the components are protected by different levels based on the important grades. Furthermore, a comparative investigation was conducted in order to appraise the economic and practical performance of the provided new fire protection method with traditional fire protection. The results indicate that the proposed fire protection strategy for SSTS based on AHP could achieve higher security with the same volume of fire retardant coatings.
Virtual Maintenance Concepts and Methods
Authors: Zhou Dong , Shi Jian Ming , Geng Jie , Lv Chuan
Published: June 2010

The paper first demonstrates some relevant concepts with virtual maintenance, and further discusses the concepts and connotations of virtual maintenance. As the key techniques, virtual maintenance model and simulation method are studied in the paper. Virtual maintenance model (VMM) is present, and the model is based on Petri Net and can describe the relations of maintenance resources. In addition, virtual maintenance simulation rules are built in the paper. Finally, a case study of the LRU repair of an aircraft is conducted, and the result confirms the validation and feasibility of all the studies, which can become a new technique means for maintainability engineering.
Two-Stage Constructing Hyper-Plane for Each Test Node of Decision Tree
Authors: She Wei , Li Hong , Yu Guo Qing , Deng Rui
Published: June 2010

How to construct the “appropriate” split hyper-plane in test nodes is the key of building decision trees. Unlike a univariate decision tree, a multivariate (oblique) decision tree could find the hyper-plane that is not orthogonal to the features’ axes. In this paper, we re-explain the process of building test nodes in terms of geometry. Based on this, we propose a method of learning the hyper-plane with two stages. The tree (TSDT) induced in this way keeps the interpretability of univariate decision trees and the trait of multivariate decision trees which could find oblique hyper-plane. The tests of the impact of Combination methods tell us that TSDT based combination algorithm is much better than other tree based combination methods in accuracy.
The Wear Resistance of Pack-Boronizing of the Oilstone Forming Die
Authors: Chen Jing , Hao Shao Xiang , Fan Xun
Published: June 2010

The main failure forms of oilstone forming die is serious wear on the work face, so the key point to extend the use life of die is how to control the wear. In order to improve the hardness and resistance to wear and prolong the use life of the oilstone forming die, the boronizing technology was used on the work face of the oilstone forming die. There are some of elements such as B、C、Al、Cr、Si　and Fe etc in boronizing layer, all of them change their contents during boronizing. Maximum value of microhardness of boronizing layer appears in subsurface, not in surface, and lows along depth of boronizing layer. The abrasion resistance of boronizing layer comes out maximum after quenching and tempering. After quenching and tempering, the lifetime of the oilstone forming die with boronizing is greatly improved.
Structural Design and Analysis on Frame of Blueberry Harvesters Based on ANSYS
Authors: Wang Qian , Li Zhi Peng , Wang Dao Qiang
Published: June 2010

The frame of blueberry harvesters is quite different from other vehicles. In this article, the design for whole frame structure is elaborated. According to the mechanical characteristics of the frame, materials are selected and manufacturability requirements are limited. Based on PRO/E software, accurate model of the frame of blueberry harvesters is established. And then, on the basis of ANSYS software, the finite element model of frame of blueberry harvesters is established to carry out static analysis on full-loaded and distortion working conditions. Results meet the strength requirements and displacement requirements, so it verifies the reasonableness of the design of frame.
Architecture Design of Customer-Oriented Digital Enterprise Systems
Authors: Liu Shi Feng , Chen Rong
Published: June 2010

The rapid development of digital enterprises changes the whole traditional structure of production and business patterns. But by now, there is no generally accepted theoretical model that can be applied in both traditional manufacturers and modern companies. In this paper, we construct a three-layer customer-oriented architecture of the digital enterprises, and elaborate the mechanism it works. For the pattern of digital enterprise will be applied in wide range of areas in the future, we put forwards three problems that must be concerned for the development of digital enterprises.
Load Transfer Analysis of Cracked Bolted Joints
Authors: Yu Da Zhao , Chen Yue Liang , Gao Yong , Liu Wen Lin , Jia Zhong Hu
Published: June 2010

Three-dimensional finite element model of a cracked bolted joint has been developed in the non-linear finite element code MSC.Marc and attempts were made to validate it by comparing results with those of experiments and other finite element. Issues in modeling the contact between the joint parts, which affect the accuracy and efficiency of the model, were presented. Experimental measurements of load transfer were compared with results from finite element analysis. The results show that three-dimensional finite element model of cracked bolted joint can produce results in close agreement with experiment. Three-dimensional effects such as bolt titling, seconding and through-thickness variations in stress and strain are well represented by such models. Three-dimensional finite element analysis was also used to study the effects of hole mod and crack on the load transfer behaviour of single lap bolted joints. The results show that hole mode has big effect on load transfer of cracked bolted joint. In the whole progress of crack growth, the load transfer through bolt 1 decrease, and almost all of the load duduction of bolt 1 transfer into blot 2 rather than into bolt 3.
Study on Dynamics Mechanics of Generation for Rail Oblique Crack
Authors: Xiong Guang Yang , Hu P. , Yang Guang Wu
Published: June 2010

In order to understand the generation of rail oblique crack, based on vehicle-track coupling dynamics theory, the coupling dynamics system with vehicle, rail, sleeper and roadbed was constructed. By using new fast explicit numerical integration method, movement differential equations of system were solved, and wheel-rail forces and contact geometry relation were obtained when power car crossing curve track. Results of calculation have shown that when power car is crossing curve track, lateral forces of outer rail at all wheelsets are pointed to outer rail, longitudinal forces are pointed to forward direction of wheelsets, and their resultant forces are pointed to the second quadrant. Wheel-rail contact points of outer rail at the first and third wheelset are located within 13mm radius of railhead, but at the second and fourth wheelset they are located within 80mm radius of railhead. Degree of wheel-rail interaction at the first and third wheelset is severer than that at the second and fourth wheelset. According to direction of resultant forces and location of wheel-rail contact points, it can be learnt that greater wheel-rail force at the first and third wheelset will easily cause generation and growth of rail oblique crack when power car crossing curve track.
Predicting Fatigue Life of Pre-Corroded LC4 Aluminum Alloy by Artificial Neural Network
Authors: Xu Cheng Long , Lv Sheng Li , Wang Zhen Guo , Zhang Wei
Published: June 2010

The purpose of this work was to predict the fatigue life of pre-corroded LC4 aluminum alloy by applying artificial neural network (ANN). Specimens were exposed to the same corrosive environment for 24h, 48h, and 72h. Fatigue tests were conducted under different stress levels. The existing experimental data sets were used for training and testing the construction of proposed network. A suitable network architecture (2-15-1) was proposed with good performance in this study. For evaluating the method efficiency, the experimental results have been compared to values predicted by ANN. The maximum absolute relative error for predicted values does not exceed 5%. Therefore it can be concluded that using neural networks to predict the fatigue life of LC4 is feasible and reliable.
The Strength Analysis of Tower Vacuum Dryer Structural
Authors: Zhang Zhi Jun , Zhang Shi Wei , Zhang Bin , Xu Cheng Hai
Published: June 2010

Tower vacuum dryer room is the key device for continuous vacuum dryer. In order to lower the cost of manufacture, the wall of dryer should be thinner. But as the pressure container, it must have the well intensity while operating. Because its complex structure, the simple calculation is not enough, the finite element analysis in intensity control was carried out. The model of vacuum dryer was built, the intensity of general primary membrane stress and the intensity of primary bending stress was picked-up on the max stress intensity point through the path of wall thickness. Accord with JB4732-1995, the structural strength was fulfilled the requirement.
Research on Remote Data Acquisition System Reliability Simulation
Authors: Yu Song , Ao Chang Lin , Liu Fang Fang
Published: June 2010

This paper presents the working principle of a remote data acquisition system based on SCM(single chip microcomputer) and analyzes the system's failure modes. It establishes the system simulation model by using fault tree analysis, and it uses Monte Carlo method to carry on reliability simulation. The total failure rate, MTBF, importance of each component and the system reliability distribution histogram are obtained. Based on the result mentioned above, we can find an effective way to improve system reliability.
Modified Analytical Method for Stress Intensity Factor Calculation of Infinite MSD Plate Containing Multiple Holes
Authors: Zhao Jin Fang , Xie Li Yang , Liu Jian Zhong , Zhao Qun
Published: June 2010

Multiple site damage (MSD) is the occurrence of small fatigue cracks at several sites within aging aircraft structures. Focusing on this typical structure, an analytical method for calculating the stress intensity factor (SIF) of an infinite plate containing multiple holes was introduced in this paper. The properties of complex variable functions are used to evaluate the stress function. The approximate superposition method is applied to solve SIF problems on multiple holes. Some numerical examples of radial cracks appearing at the boundary of two circular holes are examined by this method. By comparing the analytical and finite analysis results it was realized that the analytical results are accurate and reliable. This modified analytical method is easier to apply than traditional analytical method and can provide SIF solutions for an infinite plate containing multiple holes.
On The Fatigue Short Crack Behaviors of Directionally Solidified Superalloy DZ4 by In Situ SEM Observations
Authors: Ma Xian Feng , Shi Hui Ji
Published: June 2010

Small fatigue crack behaviors in a nickel-based directionally solidified superalloy DZ4 were studied by in situ scanning electron microscopy. The crack initiation and propagation manners were identified under different temperatures, i.e. 25oC, 350oC, 700oC. Crack growth showed to be associated with the configuration and relative direction of carbide. The anomalous short crack growth was pronounced at 25oC, 350oC and not evident at 700oC, which was analyzed by in situ examining the effect of microstructure.
An Approach Based on Enhanced Collaborative Optimization and Kriging Approximation in Multidisciplinary Design Optimization
Authors: Xiao M. , Gao Liang , Qiu Hao Bo , Shao Xin Yu , Chu Xue Zheng
Published: June 2010

This paper concentrates on the computational challenge in multidisciplinary design optimization (MDO) and a comprehensive strategy combining enhanced collaborative optimization (ECO) and kriging approximation models is introduced. In this strategy, the computational and organizational advantages of original collaborative optimization (CO) are inherited by ECO, which can satisfy the strengthened consistency requirements. Kriging approximation models are constructed to replace high-fidelity simulation models in individual disciplines and reduce the expensive computational cost in practical MDO problems. The proposed methodology is demonstrated by solving the classical speed reducer design problem. The better results indicate that ECO using kriging approximation models can achieve a considerable reduction of computational expense while guaranteeing the accuracy of optimal solutions with efficient convergence.
Nonlinear Analysis on Rigidly Attached Structure of the Luffing Jib Tower Crane
Authors: Zhang Xiao Xia , Zhu Jian Heng , Sun Chang Sheng , Yang Xiao Feng
Published: June 2010

With the purpose of researching how the parameters such as style, pitch and rod length of the attach member impact the overall crane, the variation of the strength and stiffness in attach member. The theory of nonlinear big displacement is adopted to model the overall crane. And the model was considered in several working conditions，then the trends of the stress, axial force and the displacement are shown by Graphics and data. From above, a better style of the attach member can be chosen and this method which is shortening the distance between tower centerline and outer wall lengthening the rod of attach member would be helpful to the attach member program in engineering.
Step-Stress Accelerated Random Vibration Life Testing
Authors: Sun Fu Qiang , Li Xiao Yang , Zhang Jing Rui , Jiang Tong Min
Published: June 2010

In order to reduce the sample size and test time, a step-stress accelerated random vibration life testing (ARVLT) method is presented. And the method of parameter estimation is also proposed. Through this testing method, the exaggeration factor K can be obtained rapidly, so that the result can be used as the technical basis of conducting an equivalent accelerated vibration testing of the product. In addition, the reliability of the product under the normal operation stress level can be extrapolated.
Research on Vibration Test Method of the Whole NC Machine Tool
Authors: Sun Wei , Wang Bo , Teng Yun Nan , Wen Bang Chun
Published: June 2010

Vibration test of the whole machine has become an important measure to solve vibration problem of NC machine tool, because it can evaluate anti-vibration performance and check the validity of vibration analysis. In the paper, on basis of confirming the vibration test contents for NC machine tool, the vibration test method and flow of the whole machine are proposed from the need of engineering, which include planning experiment instruments, confirming test contents, putting up test system, vibration test, analyzing experiment data etc. At last, taking a NC boring machine which is built by Shenyang machine tool group as study case, the whole machine vibration test is done. The practice indicates that the method is effectual.
Lateral Stability Control Design for Tractor Semitrailer Based on Virtual Prototyping
Authors: Zhou Shu Wen , Zhang Si Qi , Zhao Guang Yao
Published: June 2010

Tractor semitrailers on high speed obstacle avoidance under emergency are likely to arise rollover or jack-knifing, which are serious risks for motorists. A dynamic stability analysis model of a three-axle tractor semitrailer vehicle is developed using the application tool. The linearized vehicle model is utilized to predict the dynamics state of the tractor semitrailer built in multibody dynamics simulation software. The lateral stability simulation for yaw rate following and anti-rollover has been performed on the dynamic model based on virtual prototyping. The results show that the lateral stability control based on tractor semitrailer proposed in this paper can stabilize the tractor semitrailer, rollover and jack-knifing can be prevented to a large extent.
Study on Semi-Active Control for Leaf Spring Suspension Based on Virtual Prototyping
Authors: Zhang Si Qi , Zhang Tian Xia , Zhou Shu Wen
Published: June 2010

Conventional leaf spring suspension in heavy duty trucks can afford large carry capacity and better handling stability ability but less ride performance. In this paper a semi-active control was embed to the leaf spring suspension. The dynamics model of semi-active leaf spring suspension was built and analyzed. A full function heavy duty tractor using virtual prototyping was built and assembled in dynamics simulation software. A bumpy road test was performed to verify the performance of the proposed semi-active suspension. The results show that the semi-active leaf spring suspension proposed in this paper can improve the ride performance of the heavy duty trucks. The occupants in the vehicle cab will feel more comfortable.
Product Development Process Integration Using Design Structure Matrix
Authors: Zhu R.M. , Tang Dun Bing
Published: June 2010

. The Design Structure Matrix (DSM) is becoming a popular representation and analysis tool for system and process modelling. A DSM displays the relationships between components of a system in a compact, visual, and analytically advantageous format which is a square matrix with identical row and column labels. The main goal in basic DSM analysis is to minimize feedbacks by restructuring or re-architecting the process, which is to say by resequencing the rows and columns of the matrix. This widely practiced initial step in analysis is called partitioning, block diagonalization, or block triangularization, and it involves an algorithm for getting the DSM in an upper-triangular form to the extent possible, with a minimum number of subdiagonal marks pulled as close to the diagonal as possible and grouped in blocks. As a consequence, we have to identify the activities which are coupled, the loops and reorganize the matrix in order to reduce the feedbacks. An application example has been presented to illustrate the power of DSM for product development process integration.
An Extended Monte Carlo Method on Simulating the Development Cost Uncertainties of Aircraft
Authors: Huang Zhao Dong , Chang Wen Bing , Xiao Yi Yong , Liu Rui
Published: June 2010

Monte Carlo Simulation is a general method for evaluating a deterministic model by iteratively generating inputs so as to get the natural distribution of outputs, which has often been employed for risk analysis of development cost estimation under uncertain environment. However, the traditional way of implementing Monte Carlo Simulation on cost risk analysis is always based on deterministic Cost Estimation Relation (CER) model and does not take the uncertainty of history cost data used to build CER into account, which will considerably affect the cost risk analysis. In this paper, we extend Monte Carlo Simulation model to make its simulating process cover the stage of building model so that not only the inputs are iteratively generated but also the model is iteratively rebuilt. An example is carried out to compare the extended model to the traditional one on analyzing aircraft development cost risk, which shows that the risk distribution gotten by Extended Monte Carlo Simulation is considerably different to that gotten by traditional one.
Fatigue Life Prediction of Spring Buffer in GCD-1500 Cable Drill
Authors: Bu Chang Gen , Long Bo , Li J.W. , Wang L.
Published: June 2010

Conventionally designed with quasi-static algorithm, buffer springs of impact mechanism eventually have a short fatigue life. By building a rigid-flexible hybrid model of GCD-1500 cable drill, the main fatigue causes of buffer springs are investigated so as to optimize the design of springs attached to impact mechanism. Dynamic simulation is used to export load spectrum of dynamic responses of springs in conditions of “idle impact” and different bore depths. Nominal stress method is employed in nSoft Software to analyze the fatigue of springs. Some crucial conclusions are drawn: the fatigue damage brought by load spectrum of dynamic response is more severe than that brought by quasi-static mono-pulse circulation; as the bore depth is prolonged, the damage of one impact will increase; the damage of “idle impact” is 25 times as serious as that of one impact when bore depth is 70m.
Research on Web-Based Virtual Grinding Machine Tool
Authors: Guan Peng , Zhang Heng Xian , Yu Tian Biao , Wang Wan Shan
Published: June 2010

With the development of Virtual Manufacturing (VM), Virtual Machine Tool (VMT) is presented as a new field of study, which can partially or completely achieve the main functions of the machine tool. As a result, it can improve the product design quality, short the product development cycles, and reduce the development costs. This paper presents a web-based virtual grinding machine tool system. Using the Internet 3D modeling language VRML 2.0, 3D graphic modeling of the machine tool is modeled. Combined with JavaScript language, the motion simulation, virtual assembly and machining process simulation are carried out. The system is based on VRML and B/S structure. Users only need to install a free plug-in, and operate the system with IE browser. Compared with the expensive CAD/CAM software, the system can be transferred on the Internet conveniently, and has free installation, low cost, portability and low requirements for the users.
Feasible Solution of Profile-Shift Coefficient for Involute Internal Gear Pair in Zero-Tooth-Difference Mechanism
Authors: Wang Shi Jie , Zhang Chi
Published: June 2010

Zero-tooth-difference internal gear mechanism is applied in thrust-eccentric gear coupling designed particularly for oil-submerged motor driven progressing cavity pumping system. The petroleum output of pump depends on the distance (eccentricity) between the canters of external and internal gears proportionally, while the eccentricity is affected by the profile-shift coefficient (abbreviated hereafter as PSC). Larger PSC can increase the amount of eccentricity but decrease the strength of gear, especially for small numbers of teeth. The optimum coupling relationship of radial and tangential PSC is just what to be found here. The work presented in this paper focuses on a method for determining the PSC of gears in the mechanism. The domain of initial values is prepared at first based on developed mathematical model. Then, according to tooth profile engagement equation and additional constraint conditions, a reasonable set of PSC is approached for different eccentricities. Moreover, the PSC can be modified and readjusted with optimum method until satisfied result is obtained finally.
Study on the Influence of Rolling Technology on the Broadside Feature of Laser Tailor-Welded Blanks with Long Weld Seam
Authors: Hao Chang Zhong , Ma Dong Mei
Published: June 2010

Rolling technology is employed for the automated laser welding equipment to compensate for the clearance between the tailor-welded blanks which have different thicknesses. The thick blank is plastically deformed to the thin one by rolling. Two main parameters, namely, the depth of rolling and the position of rolling, have been discussed. The broadside displacement has been determined by theoretical calculations and ABAQUS simulations. Reasonable rolling technological parameters have been obtained, which provide good theoretical guidance for improving the speed and quality of laser welding.
Mechanical and Physical Characters of the Cast Steel for Chinese Railway Rolling Wagon Bogie Frames
Authors: Zhao Yong Xiang , Yang Bing
Published: June 2010

Chemical composition, metallurgical photos, macro- and micro-hardness values, macrostructures, inclusions, denseness, mechanical properties are experimentally investigated on the grade B cast steel for the bogie frames of Chinese railway rolling wagons. Results reveal that the material consists of ferrites and pearlites. Micro-hardness values of the ferrites are significant lower those of pearlites to indicate the ferrites is the weakest phase of material. Casting flaws are mainly point-network like eutectic sulfur compounds and polygonal sphere like Al2S3 compounds. Lower Young's modulus, higher proportion of yielding to ultimate strengths, higher reduction of area, and a lower elongation than those of conventional ferrous alloys are exhibited. These characters are contributed to the non-sharp cast flaws. The flaws play roles of two effects. One is to benefit anti-vibration capacity and fracture roughness. And another is to decrease the mechanical strengths.
Research on Optimization Model Based on House of Quality Fuzzy Theory in Industrial Environment
Authors: Ren Zhao Hui , Chen Ya Zhe , Wang Bing Cheng , Wen Bang Chun
Published: June 2010

In this paper, under House of Quality(HOQ) Fuzzy Theory, taking product planning House of Quality(HOQ) as an example, systematically considers fuzzy auto-correlation matrix of engineering properties influence on engineering properties target value and development cost, by definition some concepts, such as engineering properties plan improvement level, practice improvement level, fuzzy planning cost coefficient and fuzzy actual cost coefficient, establish properties target value optimization model based on House of Quality(HOQ) Fuzzy Theory, and validate this method by a case study.
Research and Application on Product Data Management Technology
Authors: Zhang You Jun , Wang Shi Jie , Li Han
Published: June 2010

Product Data Management (PDM) enables the management of the entire product lifecycle and related information about its design and its manufacturing. The key of implement PDM technology is realization of the structure and configuration management about the product. The main functions of PDM and the product development process based on PDM are detailed in this paper. An implementation method is proposed and it is applied for a system by means of an example, which achieves a good result.
Fabric Defects Image Filtering Method Based on Rough Set and PC Neural Networks
Authors: Dong Min , Jiang Hui Yu
Published: June 2010

At present, using a computer to fabric defect detection is a hot method in textile quality assess. The contrast of fabric defects images is not high and effects of tradition processing methods are not particularly good. In this paper, therefore, based on Rough Set and Pulse Coupled Neural Networks, a filtering algorithm is proposed and good results have been achieved.
A Fragile Information Hiding Technique Based on Human Visual Gray Sensitivity
Authors: Che Sheng Bing , Wang Hai Yang
Published: June 2010

Based on human visual gray sensitivity, a fragile large capacity spatial domain information hiding algorithm, and a new calculation formula of image peak signal-to-noise ratio were put forward. An adaptive embedding method was proposed, which had the minimum visual gray sensitivity when massive information were hidden into an original image. Experiments showed that this algorithm had massive amount of embedded information and excellent masking properties, and what’s more, once there is a bit tampered randomly, the watermarking image could not be recovered correctly. So it was suitable for the situation where the received information must be very strict reliably.
The Automatic Classification of ECG Based on BP Neural Network
Authors: Yu Lan Lan , Tan Bo Xue , Meng Tian Xing
Published: June 2010

The classification and recognition of ECG are helpful to distinguish and diagnose heart diseases, which also have very important clinical application value for the automatic diagnoses of ECG. The traditional recognition methods need people to extract determinant rules and have no learning ability so that they are unable to simulate the intuition and fuzzy diagnoses function used by doctor very well. The neural network technology has strongpoint of self-organization, self-learning and strong tolerance for error. It provides a new method for the automatic classification of ECG. In this paper, we use BP neural network to do automatic classification for five kinds of ECG which are natural stylebook, paced heart beating, left branch block, right branch block and ventricular tachycardia. The average recognition level is 98.1%. Experiment results show that the neural networ k technology can greatly improve the recognition level of ECG. It has good clinical application value.
Design of a Permanent Magnet Synchronous Generator for Vehicle Application
Authors: Du Qin Jun , Ba Lian Liang , Sun Chao
Published: June 2010

This paper discusses the design, fabrication and testing of a centrifugal rotor permanent magnet synchronous generator. The roller of the engine and the shell of the centrifugal outer rotor of the generator are designed together. The permanent material and the fixing block are fixed on the shell of the outer rotor. the centrifugal force increase with the rotate speed increase, so, the permanent material will not be damaged at high speed, and the reliability of the generator is improved. When the rotor turns, the magnet field turns, the generator generates electricity,with the permanent magnet material of high remnant magnetic induction and the optimized design of the generator, the output voltage is improved when the engine at low speed. We develope a single-phase double half-wave electric regulator is to ensure the stability of the output voltage and can direct output direct current.
A Novel Scheduling Approach to Waste Minimization in Process Industry
Authors: Zhao Xiao Qiang
Published: June 2010

Waste minimization opportunities could be of great importance for decreasing the waste pollution load and production costs. A formulation of multi-objective optimization problems is proposed for the optimal design of chemical processes with waste minimization. As an illustrating example, a problem of optimal design of multipurpose chemical processes was solved. The approach developed is shown to be effective for solving problems of optimal design of chemical processes with waste minimization.
An Adiabatic Register Based on Dual Threshold Leakage Reduction Technique
Authors: Hu Jian Ping , Yu Xiao Ying , Sheng Xiao Lei
Published: June 2010

This paper introduces a leakage reduction technique using dual threshold CMOS in CPAL (complementary pass-transistor adiabatic logic) circuits to reduce sub-threshold leakage dissipations. The leakage current source of the CPAL circuits is analyzed under nanometer CMOS processes. A 32 X 32 CPAL register file is demonstrated using the proposed dual threshold technique. In the proposed register file, the logic gates on critical path use low threshold transistors, while the other logic gates use dual threshold technique to reduce their leakage dissipations. All circuits are verified using HSPICE in different processes, threshold voltages, and operation frequencies, and BSIM4 model is adopted to reflect the leakage currents. Simulation results show that leakage losses are obviously reduced both in active mode and idle mode.
Applying Real-Valued Genetic Algorithm on Curve Fitting Problem
Authors: Chen Hung Jen , Chueh Hao En
Published: June 2010

Curve fitting refers to the process of finding an appropriate function that fits a finite set of data points. Representing a set of data points by a function is quite beneficial in data analysis and reapplication, and this technique is often used in engineering and technical problems. Fitting accuracy and computational time are usually the most crucial factors to be taken care of in curve fitting problems. Previous researchers have demonstrated that genetic algorithms can effectively solve curve fitting problems, but the difficulty of parameter coding is also widely encountered in computational processes. Hence, this study addresses on applying real-valued genetic algorithm to deal with curve fitting problems. Detailed discussion is made on the optimization efficiency among various data, and finally, some key parameters to curve fitting results are found and presented.
Research on Data Storage Structure and Management Model in Hierarchical Storage
Authors: Chun Yan , Li Sheng Xi , Li Ya Zhou
Published: June 2010

As hierarchical storage is one of the highlights in researching and realizing of mass data storage, this paper mainly describes a study on data storage structure, evaluation of data importance and data management model of hierarchical storage.
A Fast Algorithm for the Inverse of a Class of Tridiagonal Period Matrices in Signal Processing
Authors: Dong Chuan Dai
Published: June 2010

The Tridiagonal period Matrices, as an important tool, have much important applications ( such as in computational mathematics, physics, image processing and recognition, missile system design, nonlinear kinetics, economics and biology etc). In this paper, we give a fast algorithm for the inverse of the class of tridiagonal period matrices .
Development and Research on Embedded Fieldbus Protocol Conversion Gateway
Authors: Zhang Hao , Lou Guo Huan , Yang Jiong Zhao , Yao Zheng
Published: June 2010

Profibus and CAN bus are two kinds of widely used field bus in the industrial control field. However, this two bus protocol conversion devices are not introduced on the market, it can not meet the needs of users. Therefore, the design of a Profibus and CAN protocol translation ngateway is very important. By comparing the OSI reference model, the same points of Profibus and CAN bus can be found, their communication model structure is streamlined by the OSI model, they are only three layers, which makes it possible to interconnect them.
This paper designs an embedded protocol conversion gateway, S3C2410 processor is used as main controller, SPC3 and SJA1000 are selected as Profibus and CAN protocol chips. The design has realized Profibus and CAN bus protocol conversion, using this gateway in industrial field can bring certain economic benefits for the enterprise.
Vehicle Classification and Tracking Based on Particle Swarm Optimization and Meanshift
Authors: Li Bo , Zeng Zhi Yuan , Chen Ji Xiong
Published: June 2010

Vehicle classification and tracking is considered as one of the most challenging problems in the field of pattern recognition. In this paper, Particle Swarm Optimization (PSO) based method is exploited to recognize vehicle classes. Vehicle features, such as vehicle size, shape information, contour information are extracted. Each vehicle class is encoded as a centroid with multidimensional feature and PSO is employed to search the optimal position for each class centroid based on fitness function. After vehicle classification, an improved meanshift algorithm is presented for vehicle tracking. The algorithm’s evaluations on video image series, moving vehicle detection, vehicle classification and tracking are respectively conducted. The results show that PSO ensures a promising and stable performances in recognizing these vehicle classes, and the improved meanshift algorithm can achieve accuracy and real-time for tracking moving vehicles.
Design and Development of Database System for Astronauts’ Dietary in Space Permanent Base
Authors: Wang Shu Nan , Hu En Zhu , Zhao Ming
Published: June 2010

Bioregenerative life support system (BLSS) is one of the key technologies that must be solved before founding permanent base in space. The configuration and closure of BLSS largely depends on the astronauts’ diet. Thus, it’s necessary to set up a dietary management system for astronauts. A dietary management software system for BLSS is designed in this work. The nutritional requirements are used as constraints of the optimization process. Constrained nonlinear programming algorithm is used to accomplish the optimization process. The optimization results achieved by this software are compared with the standard nutritional needs. It will provide assistant decision support for BLSS designers.
Construction of Energy Internet System and Research on its Key Problems
Authors: Zhao Chuan Hui , Sun Ying , Li Ke Jun
Published: June 2010

Since traditional power is non-renewable and unfriendly to environment, renewable energy power which overcomes defects of traditional energy will gradually replace the conventional thermal power. Based on the utilization problem of renewable energy in Smart Grid, this paper builds an Energy Internet which supports real-time, high-speed, two-way transmission of power data and more renewable energy. The Energy Internet achieves reliable two-way transmission of power and realizes intelligent management of the grid. This paper proposes the concept and characteristics of the Energy Internet and completes the design of the Energy Internet network structure and system components. Key issues, such as Renewable Energy Management System, energy storage devices, will be discussed, and finally the paper will point out the direction for further research.
Intrusion Detection Mechanisms Based on Queuing Theory in Remote Distribution Sensor Networks
Authors: Lin Hua Yi , Chiang Tzu Chiang
Published: June 2010

Recently, sensor networks are usually applied on collecting remote sensing information. The deployed sensor nodes are separated and responsible for specific purposes, and act as an individual device. They cooperatively transmit sensed data to the base station, as shown in Fig.1. However, the transmitted data are exposed to open environments, and possibly contain confidential information. If malicious attacks interfere in the communication using huge packets to break the communication, thus the system can not work properly. In general, attackers exploit a broadcast storm or a Distributed Denial-of-Service (DDoS) attack to paralyze the entire network. Therefore, this study proposes a queuing theory based scheme to detect whether the system encounters malicious attacks. Our proposed scheme provides the arrival requests with a queuing service on the base station, which is responsible for dealing with transmitted jobs. Once the jammed traffic is anomalous for long periods, the system immediately detects the malicious attacks using our proposed approach.
Weighted LS-SVM Method for Building Cooling Load Prediction
Authors: Li Xue Mei , Chen Jia Shu , Ding Li Xing
Published: June 2010

A number of different forecasting methods have been proposed for cooling load forecasting including historic method, real-time method, time series analysis, and artificial neural networks, but accuracy and time efficiency in prediction are a couple of contradictions to be hard to resolve for building cooling load prediction. In order to improve the prediction accuracy of cooling load time series, weighted least squares support vector machine regression (WLS-SVM) method for a chaotic cooling load prediction is proposed. In this method, a sliding time window is built and data in the sliding time window are employed to reconstruct the dynamic model. Different weights are assigned to different data in the sliding time window, and the model parameters are refreshed on-line with the rolling of the time window. The results show that the method has more superior performance than other methods like LS-SVM.
A Knowledge Cognition and Ontology Based E-Learning System
Authors: Fu Ling Li , Wu Hai Yan , Wang Guo Zheng
Published: June 2010

This paper proposed a framework of knowledge cognition and ontology based e-learning system, it presented a learning characteristics based ontology metadata model(LCOM). On the basis of LCOM, according to cognitive theory and to as an example data structure course, a domain knowledge ontology base model was set up．it makes the development of network courses and management of learning resources independent.
Research on the Resource Allocation Model for the Satellite Constellation Communication System
Authors: Zhu Li Li , Duan Yi Feng
Published: June 2010

Satellite constellation, emerging as a new paradigm for next-generation communicating, enables large-scale application of the geographically and spatially distributed heterogeneous resources for solving problems in science, engineering, and military affairs. The resource allocation in such a large-scale distributed environment is a complex task.
Due to the factors that trigger the deployment of resources in satellite constellation communication system, the artificial immune theory is applied to resource allocation field to propose the task-oriented common mathematic model about resource allocation of communication system, which is aimed at the purpose of improving the effectiveness of resource allocation and is based on the 2 important indicators that are communication task’s effectiveness factors and the degree of satisfaction in the communication system. As the immune system has characteristics of self-adaptive, self-learning and self-organization, an immune allocation algorithm that fuzzy processing time is presented by applying the immune theory to resource allocation. Simulation results show that these methods are feasible and efficient in solving the problems of resource allocation for satellite constellation communication system, and the research on this object is a meaningful exploring.
Research on OpenLS-Based Mobile Location Service Platform
Authors: Zhang Chi Jun , Wang Zheng Xuan , Yang Yong Jian
Published: June 2010

Currently, LBS (Location-based Services) as a new emerging business which is based on mobile communication network is becoming more and more popular. However domestic industry is lack of perfect location service platform and standards because of the complexity and large scale of LBS. Aimed at the cases, the architecture of mobile location service (MLS) platform based on OpenLS (OpenGIS® Location Services) standards is constructed in the paper, and makes it accord with the international standard. Moreover GIS (Geographic Information System) middleware model is also proposed in the paper. We encapsulate the secondary location algorithm and path navigation algorithm into GIS middleware and present four standard interfaces, which could support distributed management and improves the portability of the platform.
The Dynamic Effect of the Top Management Support and Departmental Manager Knowledge on IT Application Maturity
Authors: Huang Man Hui
Published: June 2010

Both top management support and departmental manager IT knowledge have significant
effect on the IT application maturity. However, little is known about the dynamic effect of the top
management support and the departmental manager IT knowledge on the IT application maturity. A
multilevel study of 283 departmental managers from 42 companies supports that company ITAM
moderates the relationship between the top management support and department ITAM, and the
relationship between the departmental manager IT knowledge and department ITAM. The effect of
top management on department ITAM will be weaker in companies with higher company ITAM,
while the effect of the departmental manager IT knowledge on department ITAM will be stonger in
companies with higher company ITAM. Theoretical and practical implication is discussed.