bluuebunny/crossref_metadata_2025 huggingface dataset:
Wireless Channel Characteristic Analysis and Theoretical Modeling in Underground Mines
Authors: Zhao An Xin , Lu Ping , Lu Jian Jun
Published: January 2012

Analysis of the mine wireless channel research status, comprehensive description of the radio transmission channel characteristics. through the analysis of the wave attenuation characteristics ,This paper presents a wireless channel model for underground coal mines. In this paper, an empty straight rectangular tunnel, for example, using the ray tracing method to research the mine wireless channel characteristics and analyzes the other factors of impact the Ray Field Strength In the near field zone. Finally, through the simulation tests of Fading in the Coal Mine Tunnel and use Matlab to simulate the experimental data and simulation curves by contrast, come to this theoretical method is reasonable.
Numerical Study on Effect of Hydrogen Peroxide Additive on Ethanol HCCI Engine
Authors: Li Tian , Deng Jun , Bao Tang Tang , Wu Zhi Jun
Published: January 2012

In this article, based on a combined chemical mechanism with detailed ethanol oxidization and NO production mechanisms, a single cylinder ethanol HCCI engine model was established using the software CHEMKIN. Comparing with experimental data, this model can well predict cylinder pressure and NO emission. By changing mole fraction of hydrogen peroxide in initial ethanol mixture at different conditions, the effect of hydrogen peroxide additive on ethanol HCCI engine performance was investigated. The results show that hydrogen peroxide can effectively improve cylinder pressure and advance heat release progress, without notably increasing NO production.
Logistics Simulation of BF-BOF Region Based on Witness
Authors: Meng Hua , Wang Hua , Wang Jian Jun , Xu Jian Xin , Liang Su Mei , Li Hong Juan
Published: January 2012

The concept of logistics system simulation and the basic applications of Witness are introduced in this paper. By a specific example, the simulation model is found about the production process of steel logistics system by Witness. The relationship of production process and computer simulation is illustrated, further, the simulation model is ran and outcome is obtained. Based on the example of the production process of BF-BOF region in iron and steel enterprise simulation model, the method of the production process with WITNESS is analyzed. By setting the parameters to achieve the purpose of the actual production process is optimized. Finally, more feasible solution is put forward by simulation analysis
Experimental Study on Flow Pressure Distribution of Flood on Rural Buildings
Authors: Xiao Shi Yun , Yang Liu Juan , Yue Bin , Ge Xue Li , Zhu Li Xin
Published: January 2012

Recently, frequent torrential floods cause tremendous casualties and economic losses to the national people in China. In this paper, six 1:6 scale rural building models made of PMMA are tested to research the flow pressure of flood, which will provide the basic data for the flood-resistant design of rural buildings. The experiment of flood on buildings is carried on the large wave-current tank. The height of water is 0.6, 0.9 and 1.2 meters and the distances between the building and floodgate are 3, 6 and 9 meters respectively. The flow pressure is obtained by the sensor transducer. Based on the experimental results, the distribution of the flow pressure and some effect factors are investigated. Results show that the variation of flow pressure distributions decreases gradually with the vertical distance from bottom to top in the vertical direction. The flow pressure in the horizontal direction is different because of the boundary and holes effect.
The Operational Reliability Analysis of Airplane Tractor Drivers
Authors: Zhu Shi Fan , Jiang Jiang
Published: January 2012

The operating accuracy of the tractor driver directly affects the transportation efficiency and the airport security. The research of the human reliability is an important way to measure task performance and reduce errors. The main content of the study is to analyze the reliability of the driver of the towbarless tractor in Harbin International Airport. The task network is established using the method of HTN according to the towing actions. The reliabilities of each operation are calculated with the methods such as HCR and the characteristics of human behaviour (SOR). The simulation model is run for a hundred thousand times on the platform of the discrete event simulation software QUEST, and conclusions are brought out, one of them is the reliability of the driver is 99.666%. The main causes of the human error are the qualification and driving experience of the drivers and the circumstance of the airport.
Study of the Fourth-Generation Communication Technology Standards in Internet of Things
Authors: Yuan Quan Bo , Qu Feng Juan , Zhao Hui , Liu Li Yuan
Published: January 2012

At present,Chinese third-generation communications technology (3G) has been applied, and global internet of things technology development has been put on the agenda. The fourth-generation communication technology will be discussed based on the wireless communication field, mainly introducing the development situation of fourth-generation communication system. In the paper, the key technology will be discussed in detail, and is involved in domestic network development. Finally, the fourth-generation communication technology in the network is prospected.
Virtual Instrument Applied in Seismic Time Delay Signal Process
Authors: Li Ming , Jiang Chun Lan , Yuan Zi , Wang Zai Cheng
Published: January 2012

It is very important to do some preliminary analysis and processing of the time delay signal before the time delay estimation for the target orientation of the multi-sensor network. In this paper, a virtual instrument time delay analysis system is designed, which contains: a virtual oscilloscope, a virtual spectrum analyzer, a virtual filter and a virtual time delay analyzer. By the use of this analysis system, the spectrum of the seismic target signal collected in the field is analyzed. Analysis shows the main frequency of the target signal: 13Hz, 85Hz, 170Hz, 125Hz. Distinctness of the time delay peak is proposed to describe the validation of the cross-correlation result. Based on the three main frequency components, signals were filtered by five filters and analyzed separately. Results were shown in figures of time delay vs. time, distinctness vs. time. Each curve in a figure corresponds to a certain number of points of cross correlation. According to the results, the frequency component from 8Hz to 30Hz is much more suitable for practical use. The regular pattern of the time delay curve is consistent with the target motion. Application reveals that the system is helpful in the research of time delay estimation.
The Research and Implementation Based on Electronic Gases Simulation System of Wireless Sensor Network
Authors: Wei Li Feng , Zhang Zhi Xin , Wang Qing Hui , Feng An Song
Published: January 2012

Currently, in view of the rapid development of social economy, many problems about fire safety to be solved urgently exist in fire rescue. Therefore, the advanced wireless sensor network technique is applied in modern fire rescue. Firstly, this paper gives a brief introduction about, introducing the significance of wireless sensor network technology applied in simulation fire training system. Secondly, it introduces the basic design principle of electronic gases. Finally, it studies the functions of the system design and realization of the key technology.
Digital Control Damp Valve in Semi-Active Suspension
Authors: Ning Xiao Bin , Shen Ji Sheng , Meng Bin , Ruan Jian
Published: January 2012

It is known that for automotive semi-active suspension the damping of shock absorber shall be continuously adjustable. One approach for damping adjustment is via adjusting flow area of throttle valve of shock absorber using stepping motor. Throttle valve can be realized using electro-magnetic valve or any other type of driving valve. In order to be applied on semi-active suspension, the throttle valve is required to have high control precision, fast response speed, strong anti-pollution capability and etc.. In this paper a new type of digital valve is presented to control the flow area of shock absorber. The configuration is developed by the utilization of the two-motions-degree of freedom of a single spool. To solve the contradiction between the response speed and the quantitative accuracy which characterizes the previous valve of the same sort, a specially designed tracking program is adopted to the stepping motor control to smooth displacement output. Experimental results show that both static and dynamic performances of the digital valve can fulfill the requirement of semi-active suspension, which is valuable in the application of system such as semi-active suspension where the liquid flow needs to be controlled rapidly and accurately.
A Novel Control Model for Electric Propulsion Systems in All-Electric Ships
Authors: Su Chun Lien , Weng Ruei Hung
Published: January 2012

In recent sea and undersea vehicles, implementation of all-electric ships (e-ships) technologies that employ various types of semiconductor switching devices based power conversion modules has brought revolution. These power converters that are nonlinear loads can produce non-sinusoidal distorted currents and these currents are then delivered and broadcasted through the power network and thus bus voltages are distorted. This effect can be more obvious while large loads fed and controlled through power conversion modules, such as electric propulsion system, operate for different purposes of missions. In order to improve the harmonic distortion due to operation of electric propulsion systems, a novel control model for electric propulsion motors is proposed in this paper. The electric motor drivers are controlled through three inverter triggering signals including pulse width modulation (PWM), Quasi-Six Step, and Six-Step for different ship navigation scenarios. Simulation results of application of the proposed model to a practical ship with electric propulsion system are presented. Test results have demonstrated that with the proposed model the harmonic distortions produced by electric propulsion systems under different speed situations can be effectively mitigated and consequently the system supply quality is maintained.
Noise Based Independent Component Analysis Model for Harmonic Current Estimation
Authors: Supriya P. , Padmanabhan Nambiar T.N.
Published: January 2012

In a deregulating environment, Independent Component Analysis (ICA) is used to estimate the harmonic currents of non linear loads as it does not require information about the topology of the network. However, analysis is done by ignoring the effect of various noises that creep into the measurement system. In the present work, the effect of environmental noise on a simple interconnected power system with five buses is taken up. The two algorithms namely Fast ICA (FICA) and Efficient Variant Fast ICA(EFICA) are used for the analysis. A fixed noise is added and it is eliminated using whitening technique The simulation results of both algorithms show that noise elimination by whitening technique is highly successful. However, EFICA gives better results than FICA when random fluctuations of load exist rather than when fixed variations exist.
Trajectory Tracking Control of Nonholonomic Wheeled Mobile Robots with Actuator Dynamic Being Considered
Authors: Han Guang Xin , Zhao Yan Hui
Published: January 2012

In this paper trajectory tracking control problem for nonholonomic wheeled mobile robots with the actuator dynamics being considered is studied. On the basis of rotation error transformation and backstepping technique, tracking control law designed for kinematic model is backstepped into dynamic model and furthermore actuator dynamics is involved. Closed-loop stability is guaranteed by Lyapunov theory and Routh-Hurwitz Criterion. Finally simulation results for tracking typical trajectory are presented.
Parameters Optimization of Stereoscopic Horizontal Well Patterns by Using Numerical Reservoir Simulation
Authors: Wu Jun Lai , Liu Yue Tian , Yang Hai Ning
Published: January 2012

Well pattern is the most important affecting factor to the ultimate recovery for an oilfield development. Many researches are reported on areal well pattern, which is widely used in conventional reservoirs development such as low permeability reservoirs, heavy oil reservoirs, multi-layer sandstone reservoirs, etc. In this paper, according to the geological characteristics of fractured buried hill reservoir of Liaohe Oilfield, we firstly present the concept of stereoscopic well patterns and compare it with common areal water flooding. By using numerical reservoir simulation method, we design and optimize the parameters of 5-spot stereoscopic horizontal well patterns, including payzone thickness and horizontal well length under different anisotropic factors of fracture permeability. This can be successfully applied on the development of MM block fractured buried hill reservoir of Liaohe Oilfield.
The Problem of Absolute Stability of a Class of Lurie Switched Time-Delay Systems
Authors: Mao Bei Xing , Wang Dong Xiao
Published: January 2012

The absolute stability problem of Lurie time-delays switched systems is investigated. All the subsystems are Lurie systems. Lyapunov functions is used to derive the sufficient conditions for the absolute stability of systems
A Novel Wireless Location Algorithm Based on High Probability Measurements
Authors: Cui Xue Rong , Zhang Li , Zhang Hao , Gulliver T. Aaron
Published: January 2012

This paper presents a novel location algorithm for Ultra-Wideband (UWB) wireless communication based on Time Of Arrival (TOA) measurements. The traditional algorithm and mean value algorithm are compared with the proposed high probability algorithm in a three-dimensional (3D) indoor environment. The IEEE802.15.4a channel model is considered with Line-of-Sight (LOS) and Non-Line-Of-Sight (NLOS) propagation conditions, models CM1 and CM2, respectively. Performance results are presented which verify that the proposed algorithm can provide improved accuracy and robustness compared to other algorithms, particularly in poor channel environments.
Research on the Multi-Parameters Matching Control of the Cooling System for the Diesel Engine on the Numerical Simulation Technology
Authors: Sun Zuo Yu , Li Xiang Rong , Guo Liang Ping , Zhang Xue Yan
Published: January 2012

For the growing importance of future emission restrictions and the expanding requirement for a better fuel economy, the internal combustion engines are forced to be improved for the high strengthening direction. However, the heat loads of the engine is increasing according to the increasing of engine speed and power density, hence, the cooling system is faced to more challenge. For the cooling system is one of the key system which has more effect on the engine efficiency, fuel economy, and exhaust heats; optimize the matching control cooling system becomes one of the key technology to improve the engine performance. In this paper, several overall schemes of the cooling system are analyzed and discussed, and then one design scheme is determined to the optimal for the current diesel engine. A whole engine system is established by the software GT-Power, and the cooling system in the engine system is established by GT-Cool based on the above optimal scheme. During the simulation, the influence on the heat dissipating capability brought by the control parameters, injection advance angle, power, and torque are investigated. At last, the requirement of the heat released under full conditions is analyzed, and the relationship of the fuel consumption and the control parameters is investigated.
Statistical Study of Geomagnetic Storms during Year 1996-2007
Authors: Rathore Balveer S. , Kaushik Subhash C. , Parashar K.K. , Bhadoria Rammohan S. , Gupta Dinesh C.
Published: January 2012

A geomagnetic storm is a global disturbance in Earth’s magnetic field usually occurred due to abnormal conditions in the interplanetary magnetic field (IMF) and solar wind plasma emissions caused by various solar phenomenon. A study of 220 geomagnetic storms associated with disturbance storm time (Dst) decreases of more than -50 nT to -300 nT, observed during 1996-2007, the span of solar cycle 23. We have analyzed and studied them statistically. We find yearly occurrences of geomagnetic storm are strongly correlated with 11-year sunspot cycle, but no significant correlation between the maximum and minimum phase of solar cycle-23 have been found. It is also found that solar cycle-23 is remarkable for occurrence of Intense geomagnetic storm during its declining phase. The detailed results are discussed in this paper.
Security Region Based Dynamic Security Risk Assessment of Power Transmission System
Authors: Wang Dong Tao , Yu Yi Xin
Published: January 2012

The paper presents a framework of security region based dynamic security risk assessment of power transmission system. The application of practical dynamic security region (PDSR) in dynamic security risk assessment and the calculation steps of the dynamic security risk assessment are given in this paper. A model of risk assessment optimization which takes account of optimizing preventive and emergency control cost and contingency set decomposition is introduced. The effectiveness of this model has been proved by test results on the New England 10-generator 39-bus system.
The Design of Spectrum Analysis System on Ultrasonic Based on DSP
Authors: Wang Shao Qing , Li Ye De
Published: January 2012

The spectrum analysis system, which is based on TMS320F2808, can detect ultrasonic signal in real time. The signal is transformed from time domain to frequency domain by use of FFT. The spectrum graph can be displayed on LCD in real time. The practical results illustrated that this system can analyze the frequency spectrum efficiently with the range of 30kHz~50kHz.
Test Validation Analysis Based on Fuzzy Assessment
Authors: Wang Tie , Wang Li Qing , Dai Cao , Shang Jing
Published: January 2012

In the student culture work, the examination has turned into a recognized assessment tools in the society and different professional certificate authority depend on the examination in many institutions. While the strength and weakness of the examination quality will affect the fairness objectivity and effectiveness of the test results. The study of index and evaluation of the examination is not only a scale that evaluate the effectiveness of the examination but also an important tool that improve the quality of the examination. This paper adopts standard establishment distribution model of employer by the use of extended fuzzy evaluation and will use downhill simplex optimization to establish distribution model results of the examination and calculate index by Aitken interpolation and composite trapezoidal integration method. When the multiple targets are evaluated, COSINE similarity need be used. This method can realize the test validation analysis of small sample.
Prestress Loss Model and Experimental Study of Anchor Cables in Soft Soil Area
Authors: He Zhi Yu , Xin An
Published: January 2012

Prestressed anchor cables have been widely used in geotechnical engineering. Correct understanding of prestress loss law is crucial to the design of anchorage supporting, anchorage effects, safety and long-term stability of a whole project. The main focus of this paper is to present a new model and calculation formula for the analysis of prestress loss in soft soils. This model is based on consideration of the coupling effect of anchor cable and soil, and the physical meaning of the two parameters in the formula is investigated, i.e., D1 represents the total amount of prestress loss, the greater value of D1, the less total amount of prestress loss. D2 represents the variation rate of prestress loss of anchor cables, the greater value of D2, the greater variation rate of prestress loss. By applying this prestress loss calculation formula to the analysis of prestress loss law in practice, the analytical results turn out to be nice and accurate. This model explains the prestress loss mechanism in essence and provides a solution to analyze prestress loss characteristics of anchor cables in soft soil area. Meanwhile, the formula can be adopted to forecast the prestress loss of anchor cables at certain time in anchorage engineering in soft soil regions.
Querying the Validity of Small-Signal Amplifier Conception
Authors: Yuan Zeng Min , Yuan Xu Jin
Published: January 2012

Signal source output resistance and negative feedback resistance all contribute to restrain transistor non-linearity and improve amplifier linearity. Amplifier sine output voltage and transistor emitting junction non-sine voltage coexist. Transistor emitting junction non-sine voltage is a by-product and doesn’t affect amplifier function. It was proved by experiment and in theory that the input signal magnitude in the basic common-emitter amplifier is not limited with small signal extent condition Ubem≤10mV, and output range is not limited with Ubem≤10mV. It was proved that small signal amplifier conception does not accord with the facts and might be not suitable.
Analysis of Three Velocity Plus Attitude Matching Methods for Transfer Alignment
Authors: Han Ying Hong , Chen Wan Chun
Published: January 2012

For inertial navigation systems (INS) on moving base, transfer alignment is widely applied to initialize it. Three velocity plus attitude matching methods are compared. And Kalman filter is employed to evaluate the misalignment angle. Simulations under the same conditions show which scheme has excellent performance in precision and rapidness of estimations.
Traffic Signal Predictive Control Based on Cellular Automata Prediction Model and Non-Analytical Optimization
Authors: Wang Hong , Zhou Yong Hua , Wang Yang Peng , Wang Wei , Yang Xu
Published: January 2012

The effective control strategies of traffic signal can increase the passing-through traffic volume and decrease the total queue delay. Based on the prediction model of cellular automata, the corresponding non-analytical optimization procedure utilizing genetic algorithm is established for the traffic signal predictive control. The inductive predictive control for traffic signal is proposed which has certain practical importance. The simulation results demonstrate the advantages of proposed predictive control strategy over the conventional methods.
Using Backward-Traversing Waveform Relaxation Algorithm to Perform Incremental Simulation and Simulation-on-Demand for Circuit Simulation
Authors: Chen Chun Jung , Lee Chih Jen , Tsai Chang Lung , Chang Allen Y. , Yang Tai Ning , Sun Jenn Dong
Published: January 2012

This paper considers the repeated-executing characteristics of circuit simulators in practical situations, and raises according methods. These methods are incremental simulation and simulation-on-demand (SOD, just simulate the portion of circuit contributing to user-wanted outputs). A specialized relaxation-based algorithm, Backward-traversing Waveform Relaxation (BTWR), is adopted as the fundamental simulation algorithm. All proposed methods have been implemented and tested. Experimental results justify the values of proposed methods.
A Novel Generation Method of Spaceborne SAR Stereo Image Pair for Geolocation
Authors: Xie Ya Nan , Yang Zheng De , Zhou Xing Li
Published: January 2012

Stereo SAR geolocation model is an important geolocation model for spaceborne synthetic aperture radar (SAR). Stereo SAR geolocation model need a stereo radar image pair whose generation have much influence on the geolocation accuracy. In this paper,a novel generation method of spaceborne SAR stereo image pair for geolocation is presented which could avoid the geolocation error caused by intersection angle error.Through computer simulation,the results verify the validity of the generation method.
An New Fuzzy Support Vector Machine for Binary Classification
Authors: Zhang Rui , Liu Tong Bo , Zheng Ming Wen
Published: January 2012

In this paper, we proposed a new fuzzy support vector machine(called L2–FSVM here), which error part of object is L2–norm.Meanwhile we introduce a new method of generating fuzzy memberships so as to reduce to effects of outliers. The experimental results demonstrate that the L2-FSVM method provides improved ability to reduce to effects of outliers in comparison with traditional SVMs and FSVMs, and claim that L2–FSVM is the best way to solve the binary classiﬁcation in the three methods stated above.
Study on the Model of Construction Accident Forecast Based on Grey-Markov Theory
Authors: Huang Guo Zhong , Liu Hui , Yang Can Sheng , Wu Zhong Guang
Published: January 2012

According to the grey system theory and markov principle, the fitting accuracy index is stochastic and fluctuant when time series datadevelopment trend is fitted through the grey theory; but the markov principle is suitable for processing the system with great stochastic fluctuation; therefore, a forecast model is put forward which is in accordance with the characteristics of construction accidents’ statistical data and is based on the grey system theory and markov principle. The model is suitable for the dynamic forecasting process featured by short forecasting time, small data quality and great stochastic fluctuation. The conclusion about the development trend of construction accidents with the model based on the grey-markov theory is more ideal compared with the grey model. The application example shows that the forecasting conclusion based on grey-markov theory is more accurate and more reliable. So the model is available enough to forecast the construction accidents.
Study on the Numerical Simulation of Explosion and Impact Processes Using PC Cluster System
Authors: Fei Guang Lei , Ning Jian Guo , Ma Tian Bao
Published: January 2012

Parallel computing has been applied in many fields, and the parallel computing platform system, PC cluster based on MPI (Message Passing Interface) library under Linux operating system is a cost-effectiveness approach to parallel compute. In this paper, the key algorithm of parallel program of explosion and impact is presented. The techniques of solving data dependence and realizing communication between subdomain are proposed. From the test of program, the portability of MMIC-3D parallel program is satisfied, and compared with the single computer, PC cluster can improve the calculation speed and enlarge the scale greatly.
Design of Parking Management System Based on GSM
Authors: Zhang Guo Zhu , Yao Wei , Zhang Wei
Published: January 2012

A management method of scheduling the parking spaces in adjacent parking lot uniformly has been proposed to solve the growing problem of parking pressure caused by the increasing number of motor vehicles in cities. This method uses GSM network to collect the parking space’s status in adjacent parking lots, receives SMS or web query from owners, and shows the messages of each parking lot to them. Users could avoid the busy parking lots to parking their cars in the free parking lots relatively due to the query information, and can also obtain the right of parking spaces by appointment. The rock-bottom detection of each slave node by master node via RS485, Mater nodes transfer the detection messages to management system via GSM. The result shows this design could make use of existing parking resources. It is a good way to solve the problem of ‘Parking hard’.
Modeling and Diagnosing Buggy Programs with Points-To Analysis
Authors: Peng Tao , Zhang Qiang , Chen Rong
Published: January 2012

The main idea behind this paper is the use of cheap one-level pointer analysis information to achieve better results in the context of dependency-based program debugging. We model java programs by a points-to graph with annotations in the form of constraints, derive the inner logical representation deriving from this model, and use them to debug faults in input programs. Our analysis and the empirical results show that we can achieve better results in the context of dependency-based software debugging.
Simulation of Aviation Series Active Power Filter
Authors: Su Xue Jun , Xi Ren , Wang Cheng Gang
Published: January 2012

Active power filters have properties in rapid reflection, better compensation and the ability in dynamic suppression. An aviation series active power filter based on ip，iq method according to the theory of instantaneous reactive power was designed and simulated with PSIM in this paper. Simulation result states that the filter can compensate harmonic voltage sources, consume harmonic current, and it has good dynamic and steady properties. The result gives a way in aviation series active power filter’s design and application.
Regression Based Integration of Demand Forecasting and Inventory Decision
Authors: Xi Meng Hao , Wang He Xing , Zhao Qiu Hong
Published: January 2012

In the traditional inventory decision-making, demand forecasting and inventory control decisions are made independently, so it is difficult to ensure that the inventory cost is minimized. To make the demand forecasting and inventory control be consistent, this paper proposes a cost regression model, in which the demand forecasting is combined with the inventory decisions, aiming to minimize the inventory cost rather than the forecast error. A computational example is presented, to show the difference of the integrated decision-making model and the decentralized decision-making model.
Application of Intelligent Structure Model in Human Health Assessment System on Bioelectrical Impedance Analyze
Authors: Liu Wei , Wang Jian Ping , Zhang Chong Wei , Sun Yi Ning , Wang Ji Zhou
Published: January 2012

Human health assessment is considered as a complex process with uncertainty and serious interconnection. It is impossible to establish a precise model for the process with traditional methods. According to the medical experience and the data from bioelectrical impedance analysis (BIA), an intelligent structure model is presented in this study. The assessment process can be divided into decision level and evaluation level, and each level is decomposed into 3 stages. In the process of assessment, the transferring manner is defined based on finite-state-machine and the Analytic Hierarchy Process is applied. The problem of interconnection and uncertainty in the system can be solved by the model and it brings about a method to deal with the problem of modelling complex system.
Ruin Probabilities for Large Claims in a Class of Generalized Cramer-Lundberg Model
Authors: Fang Shi Zu
Published: January 2012

This paper investigates the ruin probabilities in a class of generalized Cramer-Lundberg model .Under the assumption that the claim sizes are heavy-tailed, we obtain a tail equivalence relationship of the ruin probabilities and establish a local asymptotic relationship for the ruin probabilities.
Tentative Idea on Initiative Protection Technology for Lightning Stroke Based on Electric Field Cancellation Theory
Authors: Pan Xiao Dong , Wei Guang Hui , Fan Li Si , Wan Hao Jiang
Published: January 2012

A new technology of initiative protection for lightning stroke based on electric field cancellation theory is presented in this paper. The real time lightning detection system and the active protection equipment are adopted. By using this new method, the protection technology of direct lightning stroke can be changed from little current triggering to weakening the electric field near the weapon system, and the down leader of charged thundercloud can be repulsed by the artificial opposed field. So the lightning discharge condition in this protection region can be destructed, and the lightning hazard to the protected equipment is eliminated radically. It effectively reduces the electromagnetic radiation, ground potential reaction and step voltage caused by the high current along conducting wire in the conventional lightning rod protection technology.
An Input-Output Optimal Control Model under Uncertain Influence and its Solution
Authors: Li Shu Rong , Wang Feng , He Xiao Yu
Published: January 2012

An input-output optimal control model is established under uncertain influence in environment. The objective function, terminal constraint of state variables and bound constraints of control variables are considered with fuzziness. The direct consumption coefficient matrix and investment coefficient matrix are regarded as stochastic variables. Membership function and chance constrained programming are applied to convert the uncertain model to a definite one. Penalty function and Particle Swarm Optimization are used to solve the model. The calculation results of an example demonstrate that the uncertain model has more practical value to decision makers compared to a definite one.
Modeling and Radial-Displacement Sensorless Method for a Hybrid-Stator Bearingless Switched Reluctance Motor
Authors: Sun Yu Kun , Zhou Yun Hong , Huang Yong Hong , Wang Wei Ran
Published: January 2012

A novel hybrid-stator bearingless switched reluctance motor (HSBSRM) was researched. After analyzing magnetic linkage characteristics, its mathematical model was built with finite element method, and a radial displacement self-sensing method was designed. This hybrid stator motor has unique advantages compared with those traditional bearingless switched reluctance motors, so radial displacement self-testing techniques have important research significance and practical value. Simulation and experimental results validated the proposed methods.
A Framework in Determining Extended Warranty by Using Two Dimensional Delay Time Model
Authors: Majid Hairudin Abdul , Wulandhari Lili Ayu , Samah Azzurah A. , Chin Ang Jun
Published: January 2012

A framework for determining optimal period and cost in extended warranty is proposed in this paper. The optimal period and cost is derived from two-dimensional delay time model. Two-dimensional delay time model is governed by age and mileage. Age and mileage gives effect for the rate of defect arrival λ. The steps for obtaining the model to estimate the optimal period cost of extended warranty is presented. It starts from modeling the defect arrival rate, the impact of preventive maintenance toward the defect arrival rate; determine the delay time distribution, data analyzing and the last optimal cost and period estimation for extended warranty.
Study on Thermal Fatigue Life Prediction of Cylinder Head
Authors: Zhao Wei Mao , Zhang Wei Zheng
Published: January 2012

Thermal fatigue tests were conducted on diesel engine cylinder heads of gray cast iron HT250 with conductive heating fatigue test rig. The thermal fatigue life is affected by the maximum temperature and heating time. The relationship between thermal fatigue life, temperature, and heating time was researched. Thermal fatigue life prediction model was derived from classical energy fatigue criteria. The parameters of the model were obtained from the results of the thermal fatigue test. The model and thermal fatigue test method are suitable for cylinder heads of cast irons and cast aluminum alloys, the parameters should be fixed by thermal fatigue test.
Soft Sensor Modeling Based on Multiple Extreme Learning Machine
Authors: Wang Gai Tang , Li Ping , Su Cheng Li
Published: January 2012

Presented is a multiple model soft sensing method based on extreme learning machine (MELM) algorithm, to solve the problem that single ELM model has lower predictive precision and over-fitting problems. The method adopts Gaussian process to choose secondary variable for soft sensor model. Then, samples data are divided into several groups of data by adaptive affinity propagation clustering, and the sub-models are estimated by ELM regression method. Finally, ELM is regarded as output synthesizer of sub-models. The proposed method has been applied to predict the end point of crude gasoline in delayed coking unit. Compared with single ELM modeling, the simulation results show that the algorithm has better predictive precision and good generalization performance.
Numerical Simulation Study on High-Rise Student Apartment Fire Evacuation
Authors: Jiang Zhong An , Liu Xiang Long
Published: January 2012

Aiming at the actual situation in case of high-rise student apartment fire, this paper sets an evacuation scene and evacuation parameters, applied BuildingExodus Evacuation Model software, and calculated the dynamic changes of evacuation time and evacuation amounts of people in each access of the building, which accords with the result of fire evacuation drill. It is concluded that it is reasonable and practicable using model software to simulate evacuation time for each floor, and the result can be a substantial reference for actual evacuation time in case of fire.
Adaptive Multiple Sub-Filters Based Stereophonic Acoustic Echo Cancellation
Authors: Barik Alaka , Nath Ravinder , Kar Asutosh , Chakraborty Madhuparna
Published: January 2012

In this paper we present the Multiple Sub-Filters (MSF) parallel structure, Least Mean Square (LMS) adaptive algorithm, for Stereophonic Acoustic Echo Cancellation (SAEC). The convergence performance of the MSF parallel structure has been studied for two types of algorithms namely; different error algorithm and common error algorithm and has been compared with conventional echo canceller via computer simulations. Simulation results show that MSF with both adaptation algorithm provide better convergence speed as compared to the conventional SAEC realized by a Single Long Filter (SLF).
Design of a SEM Compatible Slip-Stick Nano-Positioner with High Bearing Capacity
Authors: Rong Wei Bin , Yu Miao , Zhang Shi Zhong , Wang Le Feng , Sun Li Ning
Published: January 2012

This paper presents a new structure of slip-stick positioner with a high bearing capacity, which is designed according to the requirement of nano-manipulation in the Scanning Electron Microscope (SEM). In addition, to analyze the performance of the slip-stick positioner, a dynamic model is developed in MATLAB/Simulink. The experimental results demonstrate the excellent performance of this positioner and especially its bearing capacity can be up to 400g.
First Principles Study of Surface Properties for Silicon Carbide-Derived Structures
Authors: Liu Hong Ge , Zhang Rui Jun , Jin Hong Yan , Liu Qiu Xiang
Published: January 2012

Using first-principles ultra-soft pseudo-potential approach of the plane wave based on the density functional theory (DFT), we investigated the surface properties for silicon carbide-derived structure (i.e. SiCDS). The calculated results show that, movement of C and Si atoms caused by Si removal results in surface structural changing, and a nanoporous surface feature can be observed on the SiCDS surfaces when more Si atoms are removed. The mulliken population analysis indicates that the Si removal leads to the stronger chemical bonds between C–Si and the formation of new stronger chemical bands between C–C. From the density of states, as the Si removal proportion increases, C2p becomes gradually dominant in the SiCDS surface state electrons. Moreover, the Si removal leads to evidently different band gaps, indicating that the conductivity for SiCDS surface structures can be adjusted through the Si removal.
Dynamic Preventive Maintenance, Optimization of Time between Overhaul
Authors: Lyonnet Patrick , Toscano Rosario
Published: January 2012

We present in this paper an method for evaluating the reliability in real time applied to the optimization of preventive maintenance and evaluation of the parameters of dependability. This approach is based on a function Z (t), which assesses the damage from the history of real operating conditions. This assessment is used to calculate the residual reliability, and can then be used to optimize the preventive maintenance and in particular optimize the time between overhaul (TBO). This approach can be used to take more realistic decisions about preventive change and thus led to a better risk management.
Computer-Aided Ergonomics Design Technique in Industrial Product Design
Authors: Cheng Zhi Li , Cheng Wei
Published: January 2012

Computer-aided ergonomics design (CAED) is the combination of several academics knowledge, which includes computer engineering and technique, man-machine engineering and dynamics. In the paper, computer-aided ergonomics design technique in industrial product design is presented. Then, the structure of computer-aided ergonomics design technique in industrial product design is given and the application of the computer-aided ergonomics design is presented in the study. Simulation evaluation for design project in the front period can shorten the period and cost from design to manufacture and reduce the time of designer. The experimental results indicate that computer-aided ergonomics design technique in industrial product design proposed in the paper is feasible. Therefore, computer-aided ergonomics design technique in industrial product design has widely application space.
A High Performance Fuzzy Controller for Laser Tracking System
Authors: Zhang Ya Juan , Qiu Zu Rong , Chen Wen Lei , Li Xing Hua
Published: January 2012

In order to set up a controller of good dynamic response for the laser tracking system, special requirements of laser tracking system to its controller are analyzed in this article. One is exact position track and the other is rapid and steady speed response. The overall design strategy of the control system is put forward on the condition that the startup torque and Coulomb torque difference a lot and the system works at relative low speed (typically -10rpm to 10rpm). It is pointed out that the PWM method is effective to reduce system startup torque and increase steadiness of startup. In position loop a fuzzy PI controller is designed to decrease the position overshoot to 1.5mm and increase the smoothness of the tracking. The experimental results show that the tracking control system can accurately and rapidly follow movement of the target.
Design and Operating for the Logistics Systems
Authors: Wang Yan Ling
Published: January 2012

Logistics supply chain system management is the integration of key business processes from end user through original logistics suppliers that provides products, services, and information that add value for customers and other stakeholders. Due to the emergence of the global economy and intensified competition, many modern firms in the industry have recognized the importance of managing their logistics supply chains for fast product introduction and service innovations to the markets since the introduction of the term logistics supply chain management. For improved competitiveness, many modern firms in the industry have embraced the logistics supply chain management to increase organizational effectiveness and achieve such organizational goals as improved customer value, better utilization of resources, and increased profitability, through suitable design and effective operating of logistics supply chain system.
Multi-Agent Based Logistics Coordination System
Authors: Wang Yan Ling
Published: January 2012

Logistics supply chain system management is the integration of key business processes from end user through original logistics suppliers that provides products, services, and information that add value for customers and other stakeholders. Logistics supply chain is a network of suppliers, factories, warehouses, distribution centers and retailers where the raw materials are acquired, manufactured to products, which then are delivered to consumers. The increase of customer expectations in low cost and high services quality has put a premium on effective logistics supply chain reengineering. Many efforts have been endeavoring to improve the supply chain performance to achieve high agility without increasing costs For improved competitiveness, supply chain logistics system in the industry has become more and more important for modern businesses, especially for the major retailing corporations. Multi-agent system which can effectively process distributed large scale data is developed for the logistics supply chain coordinate system.
International Logistics Risk Management
Authors: Wang Yan Ling
Published: January 2012

Logistics supply chain system management is the integration of key business processes from end user through original logistics suppliers that provides products, services, and information that add value for customers and other stakeholders. Logistics supply chain is a network of suppliers, factories, warehouses, distribution centers and retailers where the raw materials are acquired, manufactured to products, which then are delivered to consumers. Fierce competition in global markets and the heightened expectations of consumers have forced business enterprises to invest in and focus attention on, the relationships with their customers and suppliers. Interest in supply chain management has also been growing in the industry both in developed and developing countries. Along with the occurrence of several catastrophic events in supply chains, risk management become more and more important. However, participants in the supply chain are separate and independent economic entities, and only consider their own benefits. The international logistics risk management problems are studied in this paper.
Dynamic Analysis and Quasi-Sliding Mode Control of Mobile Robot
Authors: Wang Hong Mei , Zhang Ming Lu , Meng Guang Zhu
Published: January 2012

To avoid the chattering disadvantage of sliding-mode control (SMC), in this paper, a quasi-sliding mode controller is proposed for real-time fine control of a nonholonomic mobile robot. First, the dynamics of mobile robot is analyzed by Lagrangian formula. Then, the quasi-sliding mode controller is used to generate the control torque that drives the mobile robot, such that the linear and angular velocities of the mobile robot follow the desired velocities. At last, computer simulation results confirm the effectives of SMC.
Vehicle Occlusion Detection and Segment Based on Windows
Authors: Xiong Chang Zhen , Li Lin
Published: January 2012

This paper proposes a method of vehicle occlusion detection and segment based on windows of the vehicle, which is used in high-definition (HD) video. Firstly, do the vehicle position after extract the background using the method of continuous frame differential method. Then draw brightness curve of the positioning region and set the threshold to segment the region of windows. From the number of windows we can judge whether vehicle occlusion is happen and do the next step. Experiments show that this method is simple and effective, with less computation, and it can divide occluded vehicles effectively, and satisfy the requirements of real-time processing.
A Qualitative Analysis and Statistics of Educational Evaluation Results Based on Decision Tree Algorithm
Authors: Liu Yang , Yu Jun Le
Published: January 2012

This paper has surveyed on education evaluation method and technology at home and abroad, and also researched on the statistics and analysis of internal education evaluation information processing technology. In view of the evaluation index system of secondary vocational education, it has established educational evaluation and analysis of statistical models based on decision tree algorithm, and also made a qualitative analysis and statistics of educational evaluation results, thereby providing the basis so as to obtain a qualitative analysis of educational evaluation in school, meanwhile, it provides a broad development prospects for the qualitative analysis quantitative analysis of educational evaluation results.
The Lightening Design of the Off-Road Vehicle Frame
Authors: Wang Cui Ping
Published: January 2012

The demand of the economy of the modern car becomes higher and higher, and the lightening design of the vehicle is an important factor in improving the economy. We do the finite element analysis for the built 3d model of the off-road vehicle frame to obtain the stress distribution and the displacement distribution, which can be used as the basis for The Lightening Design of the off-road vehicle frame. On the premise of keeping the general function unchanged, we can achieve the goal of lightening the vehicle, and improving the economy.