bluuebunny/crossref_metadata_2025 huggingface dataset:
Research on Evaluation of Emergency Logistic Plans Based on the Similarity of Intuitionistic Language
Authors: Lu Shan
Published: February 2011

On the basis of theoretical study and empirical investigation, taking the features of emergency logistic plans into comprehensive consideration and combining general plan evaluation index system, the evaluation index of the emergency logistic plan can be defined as time effectiveness, costs, security, feasibility and rationality. Since information about the criteria of the emergency logistics plan is incomplete, the method of multi-criteria decision making, based on the similarity of intuitionistic language with subjective and objective preference taking into consideration, is adopted to select and evaluate the emergency logistic plan. Through empirical investigation, the index system and evaluation methods are verified for their effectiveness and practicality.
Synchronization of Hyper-Chaotic Lorenz System and its Application in Secure Communication
Authors: Qu Shao Cheng , Liu Di , Wang Li
Published: February 2011

Synchronization of hyper-chaotic Lorenz system and its application in secure communication is studied. Based on the Lyapunov stability, an active nonlinear controller is presented to achieve synchronization of the drive system and the response system. By the conversion functions, the useful signal is modulated into the drive system, and then a secure communication based on hyper-chaotic masking is derived, which can quickly recover the useful signal from the receiver system. Simulation results illustrate the effectiveness of the proposed method.
Maintenance Simulation and Maintainability Design Based on Virtual Reality
Authors: Zhou Dong , Wang Mei Hui , Guo Zhi Qi , Lv Chuan
Published: February 2011

Virtual maintenance technology based on the concept of concurrent engineering can change the traditional maintainability "serial" design approach which cause the cycle is long, costly and difficult to change the design defects and shortcomings, and also meet the timing and economics of product development needs. However, the theory of virtual maintenance is not fully studied and researches are deficiency in the field of virtual maintenance modeling and simulation. So this article discusses the concept and connotation of virtual maintenance, and virtual maintenance model and simulation control method are studied in the paper. The model of maintenance task simulation called MTN (Maintenance Task Net) is present, and the factors including State, Action and Condition that are defined in MTN are demonstrated. In addition, the paper constructs the fire rules and the control mechanism of virtual maintenance simulation which is driven by MTN. 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 design and analysis.
A Study on the X-Ray Image Quality Evaluation Method Based on Weighted Local Entropy
Authors: Wu Qi Zhou , Zhou Jing , Liu Bin
Published: February 2011

In X-ray imaging system, with the change of parameters in material quality, volume, object distance and else of the target objects, manual adjustments of tube voltage and tube current are often needed to get ideal imaging results. Whereas human interventions are often subjective that cannot meet the automation development of X-ray detection system. In view of the above problems, a method for objective quality evaluation in images which is based on weighted local entropy is presented in the paper. Parameters adaptive adjustment in X-ray detection system can be based on this method. The validity of the approach is proved by experiment and comparative analysis with the traditional image quality evaluation function.
Micro-Simulation System on Passengers of the PDL Station Design
Authors: Gao Chun Xia , Dong Bao Tian , Li Qian , Wang Ai Li
Published: February 2011

The paper presents the context of the micro-simulation on passengers of high-speed railway station, designs the micro-simulation system, meanwhile, divides the system into four modules, they are: passengers setting module, station design module, passengers simulation module and results output module. The functions and detailed contents of the modules are described, at the same time, the models of each module involved are introduced, and the relationship between modules are represented.
Danger Theory Based Risk Evaluation Model for Smurf Attacks
Authors: Sun Fei Xian
Published: February 2011

Smurf attack belongs to popular Denial-of-Service (DoS) attack, and they can cause devastating impact on computer systems. Inspired by the principles of immune danger theory, a novel risk evaluation model, referred to as DTRESA, for smurf attacks is proposed in this paper. Within the presented model, dangerous smurf attacks are compared to bacterium (or virus) of the immune danger theory, which induce danger signal by simulating cellular distress or cell unnatural death; through immune recognition of artificial lymphocytes, the attacks are detected, and the attack risk is evaluated by calculating the danger signal of host computers. Simulation results and theoretical analysis show that the proposed model is feasible. Thus, it provides a novel solution to DoS detection and computer network security risk assessment.
Analyse Volleyball Echelon Construction of Shandong Province
Authors: Liu Min Hang , Yuan Shu Ping
Published: February 2011

This study analyses a series of problems on the volleyball team echelon construction of Shandong Province, through a great number of discrete data analysis, and put formula of Yt ＝ Yt-1+[(Yt-1 —Yt-2)+(Yt-2 — Yt-3)+…+(Yt-n —Yt-(n+l))] ／ n into calculation, so as to get the following conclusions: 1. While the number of excellent volleyball teams decreased rapidly, meanwhile, the number of 2nd-line increased steadily year by year, which showed the trend of reverse growth to 1st-line; 2. The number of 3rd-line increased slowly, not significantly change, which fluctuated on a certain level; 3. The growing speed of the number of 3rd-line was lower than the number of 2nd-line. This study will play a positive influence and promote the sustainable development of volleyball through the study of analysing volleyball team echelon construction of Shandong Province.
A RFID Privacy Protocol Based on PUF
Authors: Xie Yu Min
Published: February 2011

Physical Unclonable Function (PUF) is an excellent choice for key management in security domain. A Silicon PUF based RFID privacy protocol is proposed. Unlike general PUF applications which apply PUF in the tag-end, we employ PUF within a reader. Challenge -Responding Pairs (CRPs) on PUF in the proposal are reusable. Tag’s data structure is designed to a three level stack. Each level of the stack stands for a privacy state of the tag. State changing needs a password which only be transferred with plaintext. Password produce, storage, input/output operations are program control. We take a supermarket as application scene.
An Authentication Scheme Based on PUF
Authors: Xie Yu Min
Published: February 2011

User authentication is a key research domain in security. A user authentication scheme based on Physical Unclonable Function (PUF) is proposed. Unlike general PUF applications which apply PUF in the tag-end, we employ PUF within an Authentication Centre (AC), which is only used to verify a RFID tag is legal or not. When a tag is legal, the AC will send a password which is used only once to the request reader. The reader can use this password to decrypt the tag’s sensitive information which is encrypted with the same identical password. The later password which is used in encryption is produced and used only once within the tag.
Dynamics Analysis of Aircraft Landing on the Pitching Deck
Authors: Wang Zhen Qing , Sun Xiao Yu , Zhou Song , Lei Hong Shuai
Published: February 2011

In order to study the aircraft landing on the deck, the landing(on or off center) dynamics model of airplane on deck is built.In this model,the interactions of the aircraft landing attitude , the arresting force acting on the aircraft are considered,and the influence of dynamic deck is introduced into the model .The deck coordinate system is put forward to solve the complex simulation problem..At last,by simulation,it is demonstrated that the model can be applied to the aircraft landing attitude,it is also proved that the model is comprehensive and suitable for any abnormal landing situation.
Supplier Selection of Multi-Agent Logistic System
Authors: Yang Chang Hui
Published: February 2011

Choosing supplier with better quick response ability becomes more and more important. In this paper, the criterion of evaluating supplier is put forward and a method of evaluating supplier is introduced. To improve the efficiency of selecting supplier, a multi-agent system of supplier selection based on evaluating supplier is developed. Recurring to the supplier’s related data collected by data-mining agent from external web-server, the weights of criteria can be confirmed. And using the system, the supplier with better QRA can be selected based on the measuring results.
Research and Design of Intelligent Lighting Control System Based on Industrial Wireless Technology
Authors: Wang Jun , Chen Wei Ru
Published: February 2011

The intelligent lighting control system is one of typical applications of the Internet of things. The method of intelligent lighting control system based on industrial wireless technology is proposed in the paper. It used proposed three-point-control technology, and adjusting the brightness of lamps, turn on/off the lamps and a part of fault detection can be realized. At the same time, it can greatly reduce the cost of system. It will be useful to engineer and researchers.
Automatic Location of the Talairach Cortical Landmarks from T2-Weighted MR Images
Authors: Fu Yi Li , Zhang Guang Cai , Chang Qiu Yue , Wang Shu Guo , Han Xian Wei
Published: February 2011

For labeling the T2-weighted MR images using human brain atlas, it is prerequisite to the foundation of the Talairach space for T2W MR images, and the basic condition to found Talairach space is the location of Talairach cortical landmarks from T2W MR images. A method to locate the Talairach cortical landmarks from T2W MR images is proposed, it consists of three aspects: Firstly, determine the planes including the six cortical landmarks ; segment the planes based on fuzzy C-means clustering algorithm, gray level projection, watershed algorithm, region merging, thresholding, and morphologic operations; locate the cortical landmarks from the segmented planes. The algorithm has been validated quantitatively with 20 T2W MR images data sets. The mean errors of the Talairach cortical landmarks were below 1.00 mm. It took about 8 seconds for identifying them on P4 3.0 GHz. This fast, robust algorithm is potentially useful in clinic and for research.
Unlinkable Affiliation-Hiding Authenticated Key Exchange
Authors: Ding Yong , Li Bin , Jiang Zheng Tao
Published: February 2011

Affiliation-hiding authenticated key exchange protocol, also called secret handshake, makes two parties from the same organization realize mutual authentication and key agreement via public key certificates without leaking the organization information to any others. Moreover, if the peer involved in the protocol is not from the same group, no any information of the affiliation can be known. In previous secret handshakes protocols, there is a problem which is linkability. That is to say, two activities of the same people can be associated by the attackers. It is not desirable for privacy because the association may deduce it’s affiliation with some other information. In this paper, an unlinkable affiliation-hiding authenticated key exchange protocol is brought out to conquer the linkability. Security analysis is given finally.
Fuzzy Sliding Mode Control for 6-DOF Parallel Robot Based on Support Vector Machines
Authors: Zhu De Quan , Mei Tao , Luo Min Zhou
Published: February 2011

To realize the trajectory tracking control for six degrees of freedom parallel robot, a fuzzy sliding mode control strategy based on support vector machines is presented. Sliding mode control algorithm has complete adaptability to system disturbance and siring in sliding mode, which is used to automatically track the uncertainty of system parameters and external disturbance. Fuzzy algorithm is applied to improve the sliding mode control performance. Fuzzy support vector machines have strong treatment of non-linear signal and generalization ability, which is used to reduce the chattering in sliding mode control. The parameters of fuzzy support machines controller are optimized by hybrid learning algorithm, which combines least square algorithm with improved genetic algorithm, to get the optimal control performance for the object. The simulation results demonstrated that the control strategy designed gets tracking effect with high precision and speed, as well as reduces chattering of control under the condition of model error and external disturbance.
An Adaptive Architecture of Service Component for Persuasive Computing
Authors: Li Fei , Wang Yan Bing , Huang Ya Ning
Published: February 2011

This paper proposes a framework which focuses on thoroughly resolving functional dependency among components and enabling “Delay Adaptation”. This framework introduces an “Adaptation Table” to describe components’ interfaces and their interactions. Since functional dependency comes from the interactions among components, this “Adaptation Table” makes the dependency under control, a support toolkit is also developed. At last, the analysis of a case shows that the framework achieves the result that we expect in great measure.
Heat and Mass Transfer of Cabbage in Vacuum Cooling and Experimental Research
Authors: Kan An Kang , Han Hou De , Duan Quan Ping
Published: February 2011

The pre-cooling device was built and the columnar cabbage was taken as the study object in this paper. The heat and mass transfer mathematical models for the cylindrical shape vegetable were built and the experimental method was introduced to prove them. The comparison and analysis, under the certain vacuum degree of the vacuum chamber, was done between the simulation and the experiment. And the differences of the vacuum degree in the chamber, the temperature change of the cabbage, the relative humidity in the chamber and the cabbage mass loss, in the experiment and the simulation, were all recorded. The reason of the parameters variance and existent deference was also analyzed in this paper. The mathematical models and the result were useful for the study on the cylindrical vegetable vacuum pre-cooling technology.
Application of Fault Phenomenon Vector Distance Discriminance in Mechanical System Fault Diagnosis
Authors: Xu Yun Jie
Published: February 2011

Aiming at the problem of diagnosis difficulty caused by too many factors of mechanical system, a kind of diagnosing method based on fault phenomenon was presented. The research on mechanical system fault phenomenon space arrived at conclusion that the emergency of each fault phenomenon subject to 0-1 distribution. Therefore, phenomenon vector corresponding to each fault formed cluster whose accumulation point is expectation of vector. After exclusion of abnormal vectors, the distance discrimination was used to fault diagnosis to establish expert system based on fault phenomenon vector. The confirmed result was return back to fault database so that the system achieve self-learning of real-time diagnosis experiences. Finally, the example on X-type hydraulic excavator proves that the diagnostic method has characteristics of good real-time, simple operation and high diagnostic accuracy.
GMM with Modified Weight Applied into Audio Segment Classification
Authors: Zhang Lei , Zhao Yi , Xiang Xue Zhi
Published: February 2011

GMM with modified weight is proposed, and it is applied into the audio segment classification. Since GMM is training only by intra-class data, during classification, there may be some components in different GMM overlapping each other. That means the likelihoods of the overlap components are similar, which will induce the confusion during classification. To avoid this, the weight in GMM is modified according to the distance of components. For that component easily to confuse, the weight is deduced to decrease the effect of the component in whole result. Instead, for that component with well separability, the weight is enhanced. Based on the ratio of sub-band energy and the proposed model, an optimized likelihood is further put forward, in which the length of clip can be adjusted. From experiments, it can be drawn that GMM with modified weight has better performance than traditional GMM, and combined with optimized likelihood, the performance can be further enhanced.
Globally Exponentially Stability of Discrete-Time Recurrent Neural Networks with Unsaturating Linear Activation Functions
Authors: Lin Zong Bing , Tan Qian Rong , Li Jun
Published: February 2011

Globally exponentially stability (GES) of a class of discrete- time recurrent neural networks with unsaturating linear activation functions is studied. Based on matrix eigenvalue, a new definition of GES is presented. By applying matrix theory, some conditions for GES are obtained. Simultaneously, those conditions are proved without energy functions.
Effects of Atrium on the Electrical Activity of Sino-Atrial Node
Authors: Zhang Hong , Wang Juan , Wu Rui Juan , Yang Lin
Published: February 2011

As the electrical source of hearts, sino-atrial node (SAN) plays a significant role in rhythmic firing. The aim of this study is to determine effects of atrium on the electrical activity of SAN. Based on a mathematical model considering central and peripheral SAN cells as well as an atrial model, one-dimensional fiber with a gradual heterogeneity of SANC was developed. The forth-order Runge-Kutta and three-point centered difference methods were used to integrate the conduction model. The results demonstrated that as a load of SAN, atrium decreased the spontaneous sinus rate casing a shift of leading pacemaker site from the periphery to the center. If the ectopic beat produced by a premature stimulation was late after the end of the atrial refractory, the pause following it was compensatory. Otherwise, the pause was non-compensatory. In this case, the peripheral SANC excited earlier than the central SANC. During multiple premature beats, at short intervals the propagation could block in SAN due to a long refractory period of the action potential close to the central SANC. Leading pacemaker site shift was observed during the following several spontaneous SANC excitation. Therefore, the existence of atrium is suggested affecting not only sinus rates, but also the mode of electrical propagation and the site of the earliest excitation.
Effect of Wave and Ocean Current to Motion of Low-Velocity UUV
Authors: Du Xiao Xu , Song Bao Wei , Pan Guang
Published: February 2011

The wave and ocean current can evidently effect the motion of the low-velocity UUV, when the UUV moving close to the sea surface. To simulate the effect, we built the motion model of the UUV and the effect model of the wave and ocean current to the UUV. The simulation results show preliminarily that the UUV which effected by the wave and the ocean current have steady completed the required hovering motion. The results also show that the effect of the wave and the ocean current was different at different direction angle of the ocean current.
Primary Research on Multirate Nature of Mechatronic System
Authors: Zhou Ji Hui , Sun Fa Xiong , He Yue Hai , Xiong Guo Liang
Published: February 2011

Mechatronics system is widely used in computer numerical control, robots, medical equipment, and automatic production etc. Whereas the frequency responses of sensors and actuators in mechatronics system vary greatly, and then sampling time is also different among some links of mechatronics systems. This paper presents the multirate nature of mechatronics systems based on the characteristic of sensors and actuators. Then mechatronics system is described as a multirate discrete control system. Mathematical model of the system is established using lifting technique. Finally, a kind of motion control system that includes multirate controller is analysed and simulated with the different three sampling rates separately. The results show that the presented multirate discrete control system really exists in mechatronics system, and the performance is also influenced in a certain extent under traditional control method.
Dynamic Anti-Saturation Integral Controller Used in Time-Varying Delay System
Authors: Pu Gui You , Kang Ge Wen
Published: February 2011

Systems with large variable delay, traditional control methods can’t performance well. In this paper, a controller combined with the human-simulated intelligent controller (HSIC) and newly dynamic anti-saturation integral controller, is used in the time-varying delay motor speed control. Simulation studies show, there is no chatter in this controller which is always in norm variable structure controller and this method reaches good performance in the time-varying delay system.
Motion Planning for a Redundant Manipulator Using Genetic Algorithm
Authors: Parasuraman S. , Hou Chiew Mun , Ganapathy V.
Published: February 2011

The trajectory planning of redundant manipulator is key areas of research, which require efficient optimization algorithms. This paper presents a new method that combines multiple objectives for trajectory planning and generation for redundant manipulators. The algorithm combines collision detection, finding target and optimizing trajectory using Genetic algorithm. In order to optimize the path, an evaluation function is defined based on multiple criteria, including the total displacement of the end-effector, the total angular displacement of all the joints, as well as the uniformity of Cartesian and joint space velocities. These criteria result in minimized, smooth end-effector motions. These algorithm yields solutions instantaneously and generate the path. The proposed algorithm is analyzed and its performance is demonstrated through simulation and the results are compared with the other methods.
A Model for Ultrasonic Testing Conical Transducer and Optimal Design
Authors: Lu Chao , Xu Wei
Published: February 2011

In this paper, a numerical modeling of contact conical transducers is discussed in conjunction with wave propagation analyses by a finite difference method (FDM). Although transducers are the devices to convert electrical energy into mechanical energy and vice versa, attention in this paper is paid mostly to the study of characteristics and parameters of cones and wedges influencing their performance. Cones and wedges inserted between an ultrasonic transducer and the specimen provide the transducer with enhanced capability for point or line contact with the specimen. We study the effect of the dimensions, shape and aperture on the frequency response and the angle of incidence of the wave. Through the testing transducer modeling, some conclusions have been drawn from the analysis, which is useful to as the guideline and criteria for an optimum conical wedge design.
Improved Estimate-to-Track Association Method for Track Continuity
Authors: Ouyang Cheng , Ji Hong Bing , Zhang Jun Gen
Published: February 2011

The probability hypothesis density (PHD) filter is a practical alternative to the optimal Bayesian multi-target filter based on finite set statistics. However, the PHD filter keeps no record of target identities and hence does not produce track-valued estimates of individual targets. To solve this problem, an improved estimate-to-track association method for track continuity is proposed in this paper. Firstly, a multi-step prediction of current target states is made, and then the weighted labels are assigned to them according to the inertia. Secondly, the fuzzy membership degrees of the current state estimates belonging to the tracks are obtained by utilizing the maximum entropy fuzzy clustering. Finally, the tracks are maintained by integrating all this information. Different from the traditional estimate-to-track association method, the proposed algorithm does not update the track information by simply summing the log likelihood ratios between adjacent scans, but take the entire multi-scan information into account by the operations such as weighting and clustering. The simulation results show that the proposed algorithm can maintain target tracks more accurately, even when the targets cross each other, implying strong robustness and excellent performance of track continuity.
Optimal State Fusion of Linear Systems with Two Channel Observations
Authors: Cui Peng , Zhao Hong Guo , Zhang Mei
Published: February 2011

State fusion problem of linear systems with two channel observations is discussed. A globally optimal recursive algorithm is proposed based on projection formula and innovation analysis. Different linear weighted fusion, the algorithm presented is globally optimal, which is equivalent to centralized Kalman filtering. Moreover, the algorithm is good for real-time demand for innovations from different channels are orthogonal.
Reasearch and Application of Honeynet Key Technique
Authors: Zhang Dong Li , Jiao Wen Cheng
Published: February 2011

Honeynet is a high-alternation honeypot. The architecture of honeynet has three kernel functions: data control, data capture and data analysis. Based on the analysis of technical characteristic of honeynet, we discuss about using honeynet to make network security recovery.
Measurement of the Incident Sound Power in Ducts and Effect Factors Analysis
Authors: Zhao Hai Jun , Deng Zhao Xiang
Published: February 2011

Based on two-microphone transfer function method, the measuring method of incident sound power in duct is introduced, The special test equipment is built, and the test and measurement program of incident sound power in duct is written, and effect factors of measurement are analyzed. Results are shown that temperature, flow velocity, microphone spacing deviation and complex reflection coefficient influences less on the program. Transmission loss of perforated tube muffler with no flow is measured using the program, comparison is carried out with results of finite element method, they agrees with well, and with flow sound power of flow regeneration from the muffler is also done, an important foundation is provided for quantitative study on occurring mechanism flow regenerated noise and enhancing attenuation performance of muffler.
Modeling and Simulation of Lean Supply Chain with the Consideration of Delivery Consolidation
Authors: Miao Zhou , Xu Ke Lin
Published: February 2011

An integrated production-inventory-delivery lean supply chain model is discussed. The model is integrated with production, supply and distribution through cost. And the delivery of purchasing and distribution is consolidated. A non-linear programming model with multivariable is proposed. The length of path and the frequency of delivery are regarded as decision-making variables. The optimal delivery path and the length of path are first solved by using improved ant colony optimization algorithm. And the optimal frequency of delivery and the batch of delivery are achieved. Last, the model is validated through an example and the result indicates the model is simple and practical. Moreover it is meaningful for practice.
Continuous Join Query Processing over Structured Overlay Networks
Authors: Liu Yang , Zhao Ke Jun , Qiu Yi Hong , Liu Qi
Published: February 2011

P2P network is more suitable for distributed data flow processing. This paper concentrates on how to answer continuous join query in structured p2p overlay networks. In the algorithm proposed, the data that cannot contribute the queries’ results will not be distributed in the network based on global query indices. Experiment shows that the algorithm ensures the availability of join query and network traffic is reduced.
Absorption Simulation of Micro-Structual Material on BK7
Authors: Guo Ting Liang , Feng Guo Jin , Guo Ting Ting
Published: February 2011

The absorption characteristics of micro-structural material, such as “black silicon”, aroused extensive attention. In order to understand the impact of the micro-structure, based on Monte Carlo method, the optical simulation is used for absorption characteristics of micro-structural material. In this paper, the body material used for simulation is a kind of glass, BK7, which has been widely used. And, there are a number of 400 structual cells in the model. The bottom square of each cell is fixed to 50×50 µm, and the height of cells is adjustable. For each height, the reflectance, transmittance and absorption of microstructural material can be caculated. Then the relationship between the height and reflectance, transmittance and absorption can be built up. In our simulation, a very complex relationship between the absorption and the the structure of the material is showed. Generally, the absorption increases while the height of microstructual cell increasing.
A Neural Network Ensemble-Based Approach to Sensor Fault Detection
Authors: Shui Ai She , Chen Wei Min , Liu Li Chuan , Shui Yong Hong
Published: February 2011

This paper focuses on the problem of detecting sensor faults in feedback control systems with multistage RBF neural network ensemble-based estimators. The sensor fault detection framework is introduced. The modeling process of the estimator is presented. Fault detection is accomplished by evaluating residuals, which are the differences between the actual values of sensor outputs and the estimated values. The particular feature of the fault detection approach is using the data sequences of multi-sensor readings and controller outputs to establish the bank of estimators and fault-sensitive detectors. A detectability study has also been done with the additive type of sensor faults. The effectiveness of the proposed approach is demonstrated by means of three tank system experiment results.
Predictive Control of the VAV System Based on Recurrent Wavelet Neural Network
Authors: Li Jie Jia , Wang Ben , Guo Xiao Yan , Sun Lu Lu
Published: February 2011

An air supply control method of VAV system based on BP neural network is proposed in this paper, which combines with the recurrent wavelet neural network model, predictive control and optimization of parameters. With the proposed method, the air volume of the VAV system can be controlled accurately even if the change of the air is nonlinear and time-lapse. Compared with tradition control method, it has the advantages of rapidly converging, high control precision, strong skills of learning and wide application prospect.
Effect of Additions on Properties of the Mullite-Based Investment Materials
Authors: Yu Gui Lin , Li Nan , Li You Sheng , Wang Yi Ning
Published: February 2011

Additives will affect directly the clinic operational properties of investment materials, and finally affect the quality of castings. The relationship between additions and properties of the mullite-based investments has been studied. This paper describes effect of HBO3, Na5P3O10 and (NaPO3)6 on properties (including fluidity, initial setting time and compressive strength) of the mullite-based investment materials.It is found that with addition of HBO3, the fluidity of the mullite-based investment materials improves greatly, the initial setting time prolongs, and the compressive strength of investment materials changes little；with addition of Na5P3O10, the fluidity of mullite-based investments improves greatly, the compression strength increases, and the amount of silica gel decreases clearly；with addition of (NaPO3)5, the fluidity of mullite-based investments increases, the initial setting time prolongs, the compression strength decreases, and the amount of silica gel decreases clearly.
Analysis of Vacuum-Degree Limit of Plane Circular High-Vacuum Gas-Bearing
Authors: Li Lu Jun , Zhang Ming , Zhu Yu , Hu Jin Chun
Published: February 2011

This paper studied a one-dimensional model of high-vacuum plane circular gas-bearing with a three-stage sealing system, and analyzed the performances of the high-vacuum gas-bearing by combining the finite element method and the flow rate principle of the vacuum technology. For an expected pressure in the vacuum chamber, the zero load-capacity accident could take place. The reasons for the zero load-capacity accident were given through analyzing the flow rate of each sealing stage while the relationship between the pressure in the vacuum chamber and the inlet pressure was obtained. Besides, the influences of many parameters on the vacuum degree limit of the vacuum chamber were examined carefully. The analysis in this paper showed that for a given multi-stage seal system, the vacuum degree limit of the vacuum-chamber was inherent at the nonzero load-capacity condition.
Spectrum Analysis Methods to the Two-Level Three-Phase Inverter
Authors: Chen Guo Qiang , Kang Jian Li
Published: February 2011

Aiming at the spectrum analysis, the classification of PWM strategies based on digital implementation for the three-phase inverter is given. Then the paper summaries the three spectrum analysis methods: theoretical expression, computer simulation and experiment. The structure and procedure of each method are discussed. Each method has advantages and disadvantages. The experiment and computer simulation can be used to analyze any PWM strategy. The theoretical expression is always used to analyze the deterministic strategies.
Dynamic and Control Modeling and Simulation of High Speed Precision Positioning XY Table
Authors: Ma Zhi Peng , Zhao Xing Yu , Wang Fu Jun , Zhang Da Wei
Published: February 2011

To study the dynamic performance and control strategy of a kind of high speed precision positioning XY table with a new kind of decoupling mechanism, the electromechanical co-simulation model with three closed-loop control system using proportional–integral–derivative controller (PID controller) is constructed. By use of finite element analysis (FEA) and co-simulation method, the preloaded spring as the key component in the decoupling mechanism is optimized. The matching law of the spring stiffness and preload is presented. The decoupling mechanism influence on the dynamic performance of the XY table during the movement is fully discussed. Based on the electromechanical model, a three closed-loop control scheme with disturbance observer and feed-forward controller is proposed. Co-simulation results demonstrate the validity of the control strategy.
Water Level Control System of Boiler Drum Based on GPC
Authors: Dou Er Fei , Li Hong Xing
Published: February 2011

The paper discusses a TS fuzzy model identification method for an industrial drum-type boiler plant using the fuzzy clustering approach. The fuzzy model is constructed from a set of input-output data that covers a wide operating range of the plant. Then this paper studies the application of GPC algorithm in drum level control system Based on the T-S fuzzy model, simulates the control effect of the controller in the MATLAB environment, and analyze the performance of the control system.
Nanometer-Scale Characterization Technique for Si Nanoelectric Materials Using Synchrotron Radiation Microdiffraction
Authors: Kimura Shigeru , Imai Yasuhiko , Sakata Osamu , Sakai Akira
Published: February 2011

We have developed new microdiffraction system at the SPring-8. This system uses a focused beam produced using a phase zone plate combined with a narrow slit, which makes a small focused beam that has a small angular divergence. Furthermore, we can use the two-dimensional x-ray CCD detector, which enable us to measure local reciprocal space maps at many points in a sample, that is, the distribution of strain fields and lattice tilts can be revealed in high-angular- and high-spatial-resolution.
Improved Electrical Properties and Thermal Stability of GeON Gate Dielectrics Formed by Plasma Nitridation of Ultrathin Oxides on Ge(100)
Authors: Watanabe Heiji , Kutsuki Katsuhiro , Hideshima Iori , Okamoto Gaku , Hosoi Takuji , Shimura Takayoshi
Published: February 2011

We demonstrated the impact of plasma nitridation on thermally grown GeO2 for the purposes of obtaining high-quality germanium oxynitride (GeON) gate dielectrics. Physical characterizations revealed the formation of a nitrogen-rich surface layer on the ultrathin oxide, while keeping an abrupt GeO2/Ge interface without a transition layer. The thermal stability of the GeON layer was significantly improved over that of the pure oxide. We also found that although the GeO2 layer is vulnerable to air exposure, a nitrogen-rich layer suppresses electrical degradation and provides excellent insulating properties. Consequently, we were able to obtain Ge-MOS capacitors with GeON dielectrics of an equivalent oxide thickness (EOT) as small as 1.7 nm. Minimum interface state density (Dit) values of GeON/Ge structures, i.e., as low as 3 x 1011 cm-2eV-1, were successfully obtained for both the lower and upper halves of the bandgap.
Resistive Switching in NiO Bilayer Films with Different Crystallinity Layers
Authors: Kita Koji , Eika Atsushi , Nishimura Tomonori , Nagashio Kosuke , Toriumi Akira
Published: February 2011

Two kinds of NiO films with different crystallinity were fabricated by controlling the film deposition conditions. The well-crystalline film showed resistive switching characteristics whereas the poorly-crystalline film did not. From I-V characteristics of the NiO bilayer film consisting of those two kinds of films, it was found that the initial characteristics significantly differed according to the bias polarity. The forming voltage became lower and had less variety when the well-crystalline side was positively-biased. These results suggest that the forming voltage and currents are controllable by modifying the film properties at the metal-oxide interfaces.
Functional Device Applications of Nanosilicon
Authors: Koshida Nobuyoshi , Ohta Toshiyuki , Hirano Yoshiyuki , Mentek Romain , Gelloz Bernard
Published: February 2011

The particular physical functions of quantum-sized silicon have been investigated, along with exploration of their potential device applications. A strong confinement effect fully modifies the original optical, electrical, and thermal properties of bulk silicon. A discussion regarding their control and applications is presented, which addresses blue phosphorescence, enhanced photoconduction, operation of a ballistic electron emitter in solutions, and digital drive of a thermo-acoustic sound emitter.
Quasi-Ballistic Transport in Nano-Scale Devices: Boundary Layer, Potential Fluctuation, and Coulomb Interaction
Authors: Sano Nobuyuki , Karasawa Takahiko
Published: February 2011

The singular nature of the Boltzmann transport equation leads to the boundary layer structure around the virtual source in nano-scale device structures. We show that the boundary layer is a key concept to understand the physical mechanism behind quasi-ballistic transport in nano-scale devices. The self-consistent 3D Monte Carlo device simulator is constructed by accurately including the full Coulomb interaction. It is explicitly shown that the Coulomb interaction is indeed a key ingredient for any reliable predictions of device characteristics.
Effect of Back Bias on Variability in Intrinsic Channel SOI MOSFETs
Authors: Hiramoto Toshiro , Saraya Takuya , Lee Chi Ho
Published: February 2011

The threshold voltage (Vth) variability in fully depleted SOI MOSFETs with intrinsic channel and ultrathin buried oxide under back bias voltage (Vbs) is extensively investigated by three dimensional device simulation. It is found that the Vth variability increases only slightly by applying negative Vbs by the effect of random dopant fluctuation (RDF) in the substrate, while the Vth variability is severely degraded by applying positive Vbs by the effect of the back interface inversion. As a result, there is a certain value of Vbs around 0 V where the Vth variability is minimized.
KFM Observation of Electron Charging and Discharging in Phosphorus-Doped SOI Channel
Authors: Anwar Miftahul , Moraru Daniel , Kawai Yuya , Ligowski Maciej , Mizuno Takeshi , Jabłoński Ryszard , Tabe Michiharu
Published: February 2011

Low temperature Kelvin Probe Force Microscopy (LT-KFM) can be used to monitor the electronic potential of individual dopants under an electric field. This capability is demonstrated for silicon-on-insulator field-effect-transistors (SOI-FETs) with a phosphorus-doped channel. We show results of the detection of individual dopants in Si by LT-KFM. Furthermore, we also observe single-electron charging in individual dopants located in the Si channel region.
First-Principles Calculations of the Dielectric Constant for the GeO2 Films
Authors: Tamura Masahiro , Nakamura Jun , Natori Akiko
Published: February 2011

Dielectric properties of α-quartz and rutile-GeO2 thin-films are investigated using first-principles ground-state calculations in external electric fields. The optical and the static dielectric constants inside the films have nearly-constant values, corresponding to their bulk values, while only at the topmost surface layer the dielectric constants decrease distinctly. It has been found that the dielectric constant for the rutile-GeO2 is larger than that for the α-quartz one, which stems from the larger ionic character of the Ge-O bond for the rutile phase.
Novel Source Heterojunction Structures with Relaxed-/Strained-Layers for Quasi-Ballistic CMOS Transistors
Authors: Mizuno Tomohisa , Hasegawa Mitsuo , Sameshima Toshiyuki
Published: February 2011

We have studied new abrupt-source-relaxed/strained semiconductor-heterojunction structures for quasi-ballistic complementary-metal-oxide-semiconductor (CMOS) devices, by locally controlling the strain of a single strained semiconductor. Appling O+ ion implantation recoil energy to the strained semiconductor/buried oxide interface, Raman analysis of the strained layers indicates that we have successfully relaxed both strained-Si-on-insulator (SSOI) substrates for n-MOS and SiGe-on-insulator (SGOI) substrates for p-MOS without poly crystallizing the semiconductor layers, by optimizing O+ ion implantation conditions. As a result, it is considered that the source conduction and valence band offsets EC and EV can be realized by the energy difference in the source Si/channel-strained Si and the source-relaxed SiGe/channel-strained SiGe layers, respectively. The device simulator, considering the tunneling effects at the source heterojunction, shows that the transconductance of sub-10 nm source heterojunction MOS transistors (SHOT) continues to increase with increasing EC. Therefore, SHOT structures with the novel source heterojunction are very promising for future quasi-ballistic CMOS devices.
Effect of Al2O3 Deposition and Subsequent Annealing on Passivation of Defects in Ge-Rich SiGe-on-Insulator
Authors: Yang Hai Gui , Iyota Masatoshi , Ikeura Shogo , Wang Dong , Nakashima Hiroshi
Published: February 2011

Al2O3 deposition and subsequent post-deposition annealing (Al2O3-PDA) is proposed as an effective method to passivate electrically active defects in Ge-rich SiGe-on-insulator (SGOI) substrates. We found that Al2O3-PDA could not only suppress the surface reaction during Al-PDA, but could also effectively reduce the defect-induced acceptor and hole concentration in Ge-rich SGOI. Al2O3-PDA greatly improves the electrical characteristics of a back-gate metal-oxide-semiconductor field-effect transistor fabricated on Ge-rich SGOI.
Resistive Memory Utilizing Ferritin Protein with Nano Particle
Authors: Uenuma Mutsunori , Kawano Kentaro , Zheng Bin , Horita Masahiro , Yoshii Shigeo , Yamashita Ichiro , Uraoka Yukiharu
Published: February 2011

This study reports on the controlled single conductive path in ReRAM formed by embedding Pt nanoparticles (Pt NPs) in NiO film. Homogenous Pt NPs produced and placed by ferritin protein produce electric field convergence which leads to the controlled conductive path formation. The ReRAM with Pt NPs shows stable switching behavior. A Pt NP density decrease results in an increase of OFF state resistance and decrease of forming voltage, whereas ON resistance was independent from the Pt NP density, which indicates that a single metal NP in a memory cell will achieve extremely high-on/off resistance ratio, low power operation and stable operation.
Differential Cubature Method for Static Solution of Laminated Shells of Revolution with Mixed Boundary Conditions
Authors: Mousavi S.M.
Published: February 2011

The bending analysis of laminated shells of revolution, such as spherical, conical and cylindrical panels, is carried out utilizing the differential cubature method (DCM). To do so, a general software based on the DCM is developed which can tackle shells of revolution with symmetric and unsymmetric lamination sequence. Analysis of shells with general Loading and various combinations of clamped, simply supported, free and mixed boundary condition, may be carried out having acceptable accuracy. Using first order shear deformation theory, fifteen first order partial differential equations are obtained which contain fifteen unknowns in terms of displacements, rotations, moments and forces. Utilizing all of these equations results in the capability of the method to deal with any kinds of boundary conditions. Comparison of the results obtained by the DCM, shows very good agreement with the results of other numerical and analytical methods, while having less computational effort.
Vibration of Nonlocal Euler Beams Using Chebyshev Polynomials
Authors: Ghannadpour Seyyed Amir Mahdi , Mohammadi Bijan
Published: February 2011

This paper is concerned with the free vibration problem for micro/nano beams modelled after Eringen’s nonlocal elasticity theory and Euler beam theory. The small scale effect is taken into consideration in the former theory. The natural frequencies are obtained using the Hamilton’s principle and Chebyshev polynomial functions. The present method, which uses Rayleigh–Ritz technique in this paper, provides an efficient and extremely accurate vibration solution of micro/nano beams where the effects of small scale are significant. Numerical results for a variety of some micro/nano beams with various boundary conditions are given and compared with the available results wherever possible. Through the comparison of the results and the appropriate discussion, the knowledge of the level of capability of the developed method is promoted.
A Review of Non-Destructive Thermography Techniques Toward Structural Integrity of Bio-Composites
Authors: Dashtizadeh Zahra , Ali Aidy , Khalina Abdan
Published: February 2011

It is well known those two popular methods of testing; destructive testing based on fracture mechanics and non-destructive testing (NDT) which does not make any damage in the specimen. NDT was first used for military purpose but nowadays it is used widely in many fields such as composite materials, medical purposes, fire safety, laser welding, food safety and quality and characterization of materials. The aim of this paper is to review the recent advancement of thermography non-destructive methods especially in testing a quality of bio-composites materials. The review reveals the advantages and disadvantages of pursuing any of the available methods in NDT on bio composite materials.
The Influence of Li on the Tensile Properties of Al-Mg2Si Metal Matrix Composite
Authors: Khorshidi R. , Emamy Masoud , Raouf A. Honarbakhsh
Published: February 2011

The present research is undertaken to study the influence of Li on the tensile properties of Al-15%Mg2Si metal matrix composite. The tensile test results show that adding 0.15%Li to the composite raises the UTS and elongation values, insignificantly. In the point of fracture behaviour of the composite, the addition of 0.15%Li converts the fracture behaviour from brittle, with cleavage facets, to ductile, with fine ductile dimples.