bluuebunny/crossref_metadata_2025 huggingface dataset:
Machining Feature-Based CAD/CAPP for STEP-NC
Authors: Zhang Li Yan
Published: July 2014

ISO 14649, known as STEP-NC, is new model of data transfer between CAD/CAM systems and CNC machines. In this paper, the modeling based on machining feature is proposed. The machining feature comes from the manufacturing process considering the restriction of machining technology and machining resource. Then the framework for computer aided process planning is presented, where the algorithms of operation planning is studied. The practical example has been provided and results indicate that machining feature based model can integrate with CAPP and STEP-NC seamlessly.
Knee-FES-Ergometer for Paretic Knee Swinging Exercise: Tuning of PID Controller Using PSO
Authors: Boudville Rozan , Hussain Zakaria , Yahaya Saiful Zaimy , Taib Mohd Nasir , Ahmad Fadzil
Published: July 2014

This paper describes the parameter optimization of PID controllers of knee-FES-ergometer used to control the paralyzed knee for smooth swinging exercise. The knee-FES-ergometer is a machine that helps elongate knee swinging exercise of paralyzed people by reducing the required electrical stimulus. Particle swarm optimization (PSO) is used to optimize the PID parameters and the performance of swinging exercise are compared with the manually tuned PID parameters. Results shows that the PSO tuned PID have improved the quality of knee swinging exercise if compared with the manually tuned PID but the number of iteration for the PSO to converge is considered high and takes very long time.
An Approach to the Construction of the Personalized Knowledge Map in Knowledge Management Systems
Authors: Li Ming , Sun Bao Wen , Zhang Wei
Published: July 2014

This paper proposes a personalized knowledge map construction method to facilitate knowledge map construction in knowledge management systems. Knowledge map is an important tool in knowledge management systems. Considering the classification habits, the providing of the personalized knowledge map can make the knowledge searching more easily. The tagging reflects the user’s classification habits. Moreover, the words in the tags reflect the user’s word using habits. Therefore, we proposed an approach to the personalized knowledge map construction. Firstly, the documents are pre-processed including eliminating the stop words and stemming the word. Secondly, the KNN algorithm is modified, in which both the vector similarity and the tagging similarity are used to calculate the similarity between the documents. Finally, the topic identification methods of the clusters are proposed. Afterwards, we evaluate the personalized knowledge map construction methods. The results show that the personalized knowledge map gets a good satisfaction.
Research on ‘Three Zones’ of Goaf Spontaneous Combustion with U+L Ventilation
Authors: Zhao Yu Xin , Chen Chang Hua , He Fei , Li Jun Wen
Published: July 2014

In order to study “three zones” of goaf spontaneous combustion with U+L ventilation mode working face. Numerical simulation is used to simulate the distribution law of “three zones” of goaf spontaneous combustion in case of different distance between crossheading and working face, and different air quantity. Research suggests that the “three-zones” of spontaneous combustion has great influence with different distances and different supplied air volume.
Effects of Ca2+-Doping on the Crystal Lattice of α-Fe2O3
Authors: da Costa Andrade Bruna , da Conceição Passos José Cleverton , Macedo Marcelo Andrade
Published: July 2014

Samples of CayFe12-yO19 (0 ≤ y ≤ 1.0) were prepared by a proteic sol–gel process with hematite phase and clusters of M-type calcium hexaferrite. Impedance analysis showed that the resistivity increased with calcium concentration in the 0.0 < y ≤ 0.2 range, but decreased for y > 0.2. The saturation of the electrical resistivity occurred at 7.5 × 106 Ω·cm for Ca0.9Fe11.1O19. The plot of magnetization as a function of the magnetic field showed high values of saturation magnetization (40 emu/g) with low remanence (6.7 emu/g) and coercive field (320 Oe).
Effect of Cd Doping on Mechanical Properties of SrCoO3
Authors: Gaur N.K. , Thakur Rasna , Thakur Rajesh K. , Nigam A.K.
Published: July 2014

We have investigated the elastic and thermal properties of Sr1-xCdxCoO3 (0=x=0.1) probably for the first time by means of modified rigid ion model (MRIM). In this paper, we present the second order elastic constants (SOECs) and other elastic properties like Bulk modulus (B), Young's modulus (Y), Shear modulus (G), ̠̹̿̓̓̿̾˷̓˰̱̹͂̈́̿˰˸σ˹˼˰̵̜̱̽˷̓˰̵̵̱̱̀͂̽̈́͂˰˸m, l), transverse, longitudinal, ˰̵̷̵̱̱͆͂˰̵͇̱͆˰̵̼̳̹͉͆̿̈́˰˰˸υt, υl˼˰υm) and Anisotropy parameter (A). Here, the SOECs for Sr1-xCdxCoO3 compounds are positive and satisfy the generalized criteria for mechanically stable crystals: (C11-C12) > 0, (C11+2C12) > 0 and C44 > 0 which confirm that Sr1-xCdxCoO3 (0=x=0.1) belong to metallically bonding materials.
Electrical Properties of a TiO2-SrO Varistor System
Authors: Delbrücke Tiago , Schmidt Igor , Cava Sergio , Sousa Vânia Caldas
Published: July 2014

The addition of different dopants affects the densification and electrical properties of TiO2 based varistor ceramics. The nonlinear current (I) and voltage (V) characteristics of titanium dioxide are examined when doped with small quantities (0.5-2 at.%) of strontium oxide. This paper discusses the electrical properties of such an SrO doped TiO2 system, and demonstrates that some combinations produce electrical properties suitable for use as low voltage varistors. The high value of the nonlinear coefficient (α) (6.6), the breakdown field strength (Eb) (328 V/cm) and the leakage current (Ir) (0.22 mA/cm2) obtained in a system newly doped with SrO, are all adequate properties for application in low voltage varistors.
Electrodeposition of Zinc Oxide on Graphene Tips Electrochemically Exfoliated and O2-Plasma Treated
Authors: Saito Eduardo , Antunes E.F. , Pianassola Matheus , Christovan Fernando Henrique , Machado João Paulo Barros , Corat Evaldo Jose , Trava-Airoldi Vladimir J.
Published: July 2014

Zinc oxide (ZnO) presents several applications as piezoelectric transducers, photosensors, solar cells, electrochemical sensors, etc. Electrodeposition of zinc oxide (ZnO) thin films from aqueous solution of zinc nitrate has been deposited in graphenated low cost pencil graphite. The electrochemical graphene production at the tips was performed in a low cost DC source using concentrated sulfonitric solution. The tips were expanded in hydrogen plasma and treated by oxygen plasma to enhance its hydrophilicity. The posterior ZnO electrodeposition was highly efficient and the graphene functionalization contributes to overall electrochemical deposition mechanism.
Gas Sensor Properties of ZnO Nanorods Grown by Chemical Bath Deposition
Authors: Gasparotto Gisane , Mazon Talita , Gasparotto Gisele , Zaghete Maria Aparecida , Perazolli Leinig Antonio , Varela José Arana
Published: July 2014

The present work shows a study about the growing of ZnO nanorods by chemical bath deposition (CBD) and its application as gas sensor. It was prepared ZnO nanorods and Au decorated ZnO nanorods and the samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and gas sensing response measurements. The results obtained by XRD show the growth of ZnO phase. It was possible to observe the formation of uniform dense well-aligned ZnO nanorods. The results obtained also revealed that Ag nanoparticles have decorated the surface of ZnO nanorods successfully. Au nanoparticles with diameter of a few nanometers were distributed over the ZnO surface nanorods. The gas sensing response measurements showed a behavior of n type semiconductor. Furthermore, the Au-functionalized ZnO nanorods gas sensors showed a considerably enhanced response at 250 and 300 °C.
A Capacitive-Type Humidity Sensor Using Porous Ceramics for Environmental Monitoring
Authors: Oliveira Rodrigo de Matos , Nono Maria do Carmo de Andrade , de Souza Oliveira Gustavo
Published: July 2014

The growing interest for the environmental monitoring in order to minimize the potential risk of landslide in hillsides and to prevent new disasters, has led the improvement in the development of new materials for manufacturing of capacitive sensor devices more reliable, more versatile and at lower cost. In this sense, ceramics have shown advantages from the point of view of mechanical resistance, resistance to chemical attacks and physical and chemical stability in aggressive environments. In addition, these materials have a unique structure, consisting of grains, grain boundaries, surfaces and pores, the control of which permit the attainment of suitable microstructures to be used as moisture sensors. The goal of this work is to investigate the capability of porous ceramics sensor devices, developed in National Institute of Space Research (INPE), to monitor the soil water dynamics. For that, ceramics sensors microstructures were characterized through scanning electron microscopy (SEM), X-ray diffractometry (XRD) and Hg porosimetry techniques. Electrical measurements were performed in function of water addition in soil samples, up to the saturation limit, for different time intervals, in the same way it happens in area with landslide risk in periods of rain. The analyses of the results evidenced that the ceramics devices are promising ones concerning to their potential in the monitoring of environmental parameters.
Nanostructured TiO2-Based Composites for Light Absorption
Authors: dos Santos Dayse I. , Modesto Jr. Olayr , Scalvi Luis Vicente A. , Tabata Americo S.
Published: July 2014

Metal oxide nanocomposites were prepared by two different routes: polyol and sol-gel. Characterization by X ray diffraction showed that the first process produces directly a two-phase material, while the sol-gel powder never showed second phase below 600°C. Light spectroscopy of the treated powders indicated similarities for the processed materials. Although the overall material compositions are about the same, different structural characteristics are found for each processing. With the exception of Ti-Zn materials, all the double metal oxide powders showed higher absorbance than either TiO2 powder.
Synthesis and Optical Property of MgMoO4 Crystals
Authors: Xavier Camila Soares , de Moura Ana Paula , Longo Elson , Varela José Arana , Zaghete Maria Aparecida
Published: July 2014

In this work, we report on the synthesis of MgMoO4 crystals by oxide mixed method. The powder was calcined at 1100 °C for 4h and analyzed by X-ray diffraction (XRD), Fourier transform infrared (FT-IR), Field emission gun scanning electron microscopy (FEG-SEM), Ultraviolet-visible (UV-vis) absorption spectroscopy and Photoluminescence (PL) measurement. XRD analyses revealed that the MgMoO4 powders crystallize in a monoclinic structure and are free secondary phases. UVvis technique was employed to determine the optical band gap of this material. MgMoO4 crystals exhibit an intense PL emission at room temperature with maximum peak at 579 nm (yellow region) when excited by 350 nm wavelength at room temperature.
Effect of Substituting Sr2+ for Gd3+ on Structural and Magnetoelectric Properties of W-Type Hexaferrite
Authors: da Costa Andrade Bruna , Macedo Marcelo Andrade
Published: July 2014

Sr1-xGdxCo2Fe16O27-δ, (x = 0.05–0.20) was prepared via the proteic sol-gel process. Single-phase W-type hexaferrite doped with gadolinium was synthesized. The ferrite shows ferrimagnetic behavior with high saturation magnetization, low coercive field, low remnant magnetization, and a resistivity greater than 107 Ω·cm. The substitution of Sr2+ for Gd3+ improved the magnetoelectric properties of the ferrite owing to the increase in the concentration of Fe2+ and improvement of electron conduction.
Controlled Atmosphere Thermal Treatment for Pyrochlore Phase Elimination of PMN-PT/CFO Prepared by Spark Plasma Sintering
Authors: Viana Diego Seiti Fukano , Eiras José Antônio , Nascimento William Junior , Zabotto Fabio Luiz , Garcia Ducinei
Published: July 2014

Multiferroics are interesting materials which present more than one ferroic property and have a great potential for practical applications [,,]. In addition, the coupling of magnetic and electric properties, the magnetoelectric effect (ME), offers news possibilities to applications [2,]. The magnetoelectric effect can be observed in single-phase materials like LuFe2O4, BiFeO3, etc. [1,] or in composites like PMN-PT/CFO, BaTiO3/CoFe2O4, etc. The ME composites have advantages over single-phase materials. They are easier to fabricate, less expensive, and have a wider range of working temperatures than single-phase materials []. However, some parameters that enhance the ME response need to be optimized. These parameters are the composition, the microstructure (grain size, grain orientation) and sintering parameters [6]. Thus, this work attempts to create a synthesis protocol to prepare the ME composite PMN-PT/CFO by Spark Plasma Sintering (SPS) keeping the average grain size as small as possible.
Elastic and Thermal Properties of SrCo1-xScxO3-δ
Authors: Thakur Rasna , Thakur Rajesh K. , Gaur N.K.
Published: July 2014

We have investigated the elastic and thermal properties for perovskite SrCo1-xScxO3-d, by means of Modified Rigid Ion Model (MRIM). We have also computed the second order Elastic constants (SOECs) and their combinations. Besides we have reported the cohesive energy (f), Debye temperature (θD) and Gruneisen parameter (γ). The variation of specific heat (C) at temperature 15 K≤x≤1000 K is computed for SrCo1-xScxO3-d. The computed properties reproduce well with the available data in literature.
Ferroelectric Properties of Bi0.5(Na0.8K0.2)0.5TiO3 Ceramics
Authors: Camargo Javier , Ramajo Leandro , Rubio-Marcos Fernando , Castro Miriam
Published: July 2014

Different processing conditions and the effect of secondary phases on ferroelectric properties of Bi0.5(Na0.8K0.2)0.5TiO3(BNKT) are studied. Ceramic powders are prepared by solid state reaction and different sintering temperatures (temperatures between 1075 and 1150°C) are analyzed. Finally, samples are characterized by X-ray diffraction, Raman microspectroscopy, Scanning Electron Microscopy, impedance spectroscopy, and density measurements. Through XRD patterns, the perovskite structure is stabilized; together with small peaks corresponding to a secondary phase associated with K2-xNaxTi6O13phase. Moreover, the content of the secondary phase, d33piezoelectric constant and dielectric properties increase with sintering temperature.
Effects of La Doping on the Structural and Dielectric Properties of Barium Titanate Ceramics
Authors: Silva Marcelo S. , Ferreira Nilson S.
Published: July 2014

Polycrystalline samples of Ba1-xLaxTiO3 (x = 0.0, 0.002, 0.004) were prepared by a standard high-temperature solid-state reaction method. XRD studies confirmed the formation of a polycrystalline compound with a tetragonal crystal structure. SEM images suggested the presence of a polycrystalline microstructure with certain degree of porosity, and the grains appeared to be distributed inhomogeneously throughout the pallet samples. Dielectric studies indicated a ferroelectric–paraelectric phase transition with a clear shift in the Curie temperature (Tc) of BaTiO3 towards a lower temperature upon doping. The brick-layer model was used to study the potential barrier and the structure of the grain-boundary region of the Ba9.998La0.002TiO3 and Ba9.996La0.004TiO3 ceramics. These ceramics exhibited good density and a homogeneous distribution of the grains. The thickness of the grain-boundary region was calculated to be approximately 200 nm.
Influence of the Zn Dopant in Structural and Electrical Properties of the La2Ni1-xZnxO4
Authors: Silva C.A. , Silva Joeliton B. , Silva-Santana M.C. , Silva Petrucio Barrozo , Moreno Nelson O.
Published: July 2014

In this work, we present results of synthesis, electric and structural characterization of Ruddlesden- Popper Lan+1Nin-xZnxO3n+1(n =1, 0<x<0.4) compounds. The samples were synthesized by combustion reaction method by using citric acid as fuel. The precursors obtained from this reaction were treated for 12 hours at 1100 °C in air. The polycrystalline samples were characterized by X-ray diffraction (XRD) and electric resistivity. The XRD results indicate that samples were obtained with single phase in the orthorhombic symmetry and space group I4/mmm. The preliminary results suggest that the Zn-doping plays an important role on the charge transport and modifies the manner that the holes are arranged in the system.
Effects of Oxygen Doping on the Transport Properties of Hg0.82Re0.18Ba2Ca2Cu3O8+d Superconducting Polycrystals
Authors: Passos Carlos Auguto Cardoso , Rocha Jefferson Rodrigues , de Sousa Bolzan Marcio
Published: July 2014

Hg0.82Re0.18Ba2Ca2Cu3O8+dpolycrystalline ceramic samples were prepared using a solid-vapour reaction technique. First, the ceramic precursor was prepared from a mixture of Ba2Ca2Cu3Oxand ReO2powders in a molar ratio of 1:0.18. The precursor material was annealed under three different partial pressures of oxygen that consisted of a mixture of oxygen/argon in the following ratios: 5/95 (sample A), 10/90 (sample B) and 15/85 (sample C). Secondly, the precursors prepared at different O2partial pressures were blended with HgO at a molar relationship of 1:0.82. The synthesis was carried out at 865 °C for 72 h. Moreover, analyses using X-ray powder diffraction, Scanning Electron Microscopy (SEM), and Energy Dispersion X-ray spectroscopy (EDS) were performed. These results demonstrated a similarity in the grain morphology within the samples. Using SEM images, a histogram of grain-boundary size was produced where the average junction size is represented by a gamma density distribution function. Finally, the samples were submitted to ac electrical resistivity ρ (T) under a low applied magnetic field (up to 400 Oe). Samples cut into bars approximately 7 × 1 × 1 mm3in size were studied using a four-probe technique. The zero-resistance critical temperatures (Tcj) were determined from ρ (T) curves. The results are compared and qualitatively explained in the framework of flux trapping by superconducting grains. In our opinion, the oxygen partial pressure has a strong influence on the grain junctions and causes island structures that form defects at the grain boundaries.
Noise Analysis and Characterization of a CMOS Interface Circuit for Fluxgate Sensor
Authors: Dong Chang Chun , Jiang Zhan Peng
Published: July 2014

In this paper, noise analysis and characterization of a 5V CMOS interface circuit for the fluxgate is presented, which is based on second-harmonic detection of the output voltage. The circuit consists of oscillator, band pass filter, phase sensitive demodulation, low pass filter. The chip is fabricated in the 0.5μm two–metal and two-poly n-well CMOS process with an area of 4 mm2. Experimental results shows, the system exhibits a sensitivity of 16.5μV/nT for a magnetic field range of ±90μT in open-loop with 5kHz excitation frequency. Using 5V supply voltage, the power consumption of the system is measured to be 35 mW.
Design of a Three-Stage Amplifier with Single Miller Capacitor Feedforward Compensation
Authors: Cui Lin Hai , Lu Xue Bin , Guang Yang
Published: July 2014

An efficient three-stage amplifier with a new compensation method called single Miller capacitor feedforward compensation (SMFFC) which is suitable for large capacitive load applications are introduced in this paper. The overall layout area of the amplifier can be significantly reduced without influencing their stability by using a single Miller compensation capacitor in a three-stage amplifier. Pole-splitting and feedforward techniques are effectively combined in this compensation method to achieve a better performance.
The Design of the Sinusoidal Signal Generator
Authors: Sun Guo Dong , Song Ming Xin , Wang Shan Shan , Zhao Yu
Published: July 2014

Sinusoidal signal generator is common electronic equipment. In this paper, the writer designed a kind of integrated CMOS sine signal generator, which generator uses wien bridge oscillation circuit.This generator circuit mainly constitutes by amplifier, leveled and low-pass filter circuit, which uses Cadence software to simulate and analysis its amplification circuit, in order to get a sine wave which has high performance accuracy and stability. Through simulating this generator, we can get a kind of sine wave which includes the frequency as the 1.109 kHz, the center potential as 2.5V, the amplitude as 2.58V, distortion is less than 2%, and this sine wave is more practical for the lower voltage supply system.
The Nonlinear Analysis of Readout Circuit for Microgyroscope
Authors: Wang Guan Shi , Liu Xiao Wei
Published: July 2014

In a vibratory microgyroscope, the nonlinear of the readout circuit is a critical part of the signal processing. This is because nonlinear can corrupt the resulting signals, including the angular velocity information. In this paper, issues related to nonliear are discussed. A detailed analysis of the effects caused by various nonidealities is provided. The nonlinear considered are as follows: the distance between the active comb and the fixed comb at the static modal and the equivalent capacitance at sensitive modal. In addition to the analysis of the nonlinear, which is necessary for a successful system-level design is provided.
Flatness Improvement of FRA with Multi-Wavelength Pump
Authors: Ma Yu , Li Yan Chao , Liu Chang Xing , Meng Xiang Yu , Yang Jiu Ru
Published: July 2014

A fiber Raman amplifier (FRA) based on the properties of silica fiber can not only get a wideband gain spectrum by using multiple pumps, but also has the nature of low noise and cost. In the study of FRA, gain-flatness is one of the most key and hot issues. In this paper, we focus on the gain flatness of fiber Raman amplifier by multi-pump, and various parameters in term if power and number of pump source are analyzed comprehensively. According to the numerical results obtained, the optimized within power and number of the pump source are determined. And we controlled the gain-flatness of FRA within ±1 dB from 1512nm to 1566nm in a dense wavelength division multiplexing system with 67 channels.
Semantic Feature Modeling Based on the Decomposition of Feature Dependent Graph
Authors: Gao Xue Yao , Zhang Chun Xiang , Yu Xiao Yang
Published: July 2014

Semantic feature modeling is an important research topic in CAD, in which geometric constraints in model are solved automatically. A semantic feature modeling method is given in this paper. Firstly, the feature dependent graph is built based on geometric constraints. Secondly, the feature dependent graph is decomposed according to the complexity of subgraphs and the whole problem of solving geometric constraints is divided into several small ones. Thirdly, these small problems are solved. At the same time, the modeling architecture based on the decomposition of feature dependent graph is given. Experimental results show that when the proposed method is applied, the modeling performance is improved.
Nipdroid: An Enhanced Detection Mechanism for Android IPC
Authors: Chen Chen , Song Jia Xing , Liu Wei Dong
Published: July 2014

As one of the most popular mobile operating system, Android has been troubled by privilege escalation attacks. This is because that the original Android ignores the inspection of transmitted data inintent. It only checks the permission ofintentto determine whether the Inter-Process Communication (IPC) could continue. We developed Nipdroid to solve the mentioned defect in Android IPC detection. Nipdroid is based on the technology of marking and tracking sensitive data. After the original Android detection, Nipdroid extracts the sensitive tags fromintent, and matches them with the permission lists of both communication apps, and then checks whether there is unreasonable data transmission in IPC. Experiments show that Nipdroid is effective on both preventing privilege escalation attacks and protecting user's sensitive data.
Designing of New Intelligent Music Electro-Acupuncture Apparatus
Authors: Bi Sheng Zhao , Liu Ye , Wang Can Hua
Published: July 2014

The phenomenon of acupoint electrical-stimulation adaptability is common while traditional Pulse Electro-acupuncture (EA) Apparatus is used for treatment. To solve this problem, we designed an intelligent Music Electro-acupuncture (EA) Apparatus base on ARM9 and Linux. We analyzed power spectrum of music and put forward a possible screening technique for effective treatment music based on “1/f fluctuation” therapy. This system has excellent Qt user interface and touch screen. It is good for physical and psychological rehabilitation to listen to our music during treatment.
A New Quadtree-Based Skyline Query Algorithm
Authors: Liu Run Tao , Chen Yuan Jing , Cao Da Yong , Liu De Yu
Published: July 2014

In this paper, the index structure, PR-quadtree for spatial data, is used to store data for a database. The properties of the quadtree are studied. With the properties prunning rules are set up for searching the Skyline set of the data stored in the quadtree. Through detailed analysis for the tree the method of finding some approximate skyline points is designed, by which a new skyline searching algorithm is given. The new algorithm is more effective.
A Game Theoretic Analysis of Resource Pricing and Sharing in P2P Networks
Authors: Zhang Qing Feng , Wang Sheng , Liao Dan
Published: July 2014

—This paper proposed an incentive mechanism of resource pricing and sharing to achieve the maximum of profits, which based on game theory. Firstly, we proved the Cournot equilibrium sharing within different price and cost functions to achieve the maximum profits. Secondly, we analyze and solve the Cournot equilibrium sharing, the unit profit and the total profits. Finally, simulation show that the proposed model relationships among the number of providers, different of price and cost functions, the maximum profits parameter, the unit profit and the total profits.
Algorithm for Discovering Community in Multi-Relational Social Network Based on Modified Common Neighbors Similarity
Authors: Qiu Li Qing , Liang Yong Quan , Xu Jian Jian , Chen Zhuo Yan
Published: July 2014

The multi-relational social network is a new social network, which is proposed in recent years and more complex than single relational social network. Therefore, the existing community discovery algorithm is lack and their results are crude. The paper proposes a new algorithm for discovering community in multi-relational social network based on modified common neighbors similarity. The core idea is the more common neighbors are shared between two nodes, the more similar the nodes are. Finally, we test our generalized algorithm on an artificial sparse network in four dimensions.
Study on Self-Сonfiguration Model and Environment Awareness Algorithm for Mission-Critical Systems
Authors: Wang Jian , Zhao Guo Sheng
Published: July 2014

It is becoming more and more difficult to manage, maintain and keep the key services of mission-critical systems by manual because of hardware problems, software bug, misoperation and malicious attacks. In order to solve the above problems, a self-configuration model was proposed, and awareness algorithm was discussed. The heartbeat mechanism was utilized to realize internal environment awareness, and then the context-modeling technology was introduced to describe user activities and system resources formally, which can obtain the external environment awareness. The self-configuration model has interactivity among modules during operations, and able to improve the self-management ability of mission-critical systems effectively.
Modified Proportional 2-Tuple and its Application in Uncertainty Environment
Authors: Zhang Ai Ping , Zhan Tong Jun
Published: July 2014

A modified proportional 2-tuple was proposed to apply to the term sets in that the distance of the adjacent tems is not equal,and the comparison methods as well as the aggregation operators were proposed too.And the modified proportional 2-tuple fuzzy linguistic representation model is extended to uncertainty modified proportional 2-tuple fuzzy linguistic representation model,and the new comparison rule and aggregation operators were provided.
Based on Non-Redundant Electronic Scale Engineering Development Theory
Authors: Li Rui , Li Peng
Published: July 2014

This paper regards combinatorial techniques for electronic engineering design based on the mathematical apparatus of Non Redundant Scales theory (NRS theory).Combinatorial techniques is known to be of widespread applicability, and has been extremely effective when applied to the problem of finding the optimum ordered arrangement of structural elements in spatially or temporally distributed systems with non-uniform structure (e.g. line gages) with respect to resolving ability. These design techniques make it possible to configure electronic devices or systems with fever elements than at present, while maintaining on resolving ability and positioning precision. The NRS theory can be used to finding optimal design for wide classes of technological problems in measurement and radio electronic engineering based on combinatorial techniques.
Design and Implementation of Unified DCT/IDCT Architecture Based on FPGA
Authors: Huang Hai , Liu Jia Ming , Lu Xue Bin , Yu Bin
Published: July 2014

This paper proposes a unified architecture for computation of discrete cosine transform (DCT) and its inverse transform (IDCT). The matrix decomposition algorithm is used to deduce the proposed algorithm. Based on this algorithm, a unified DCT/IDCT architecture is developed. Then, this architecture is modeled in HDL, verified and implemented with FPGA. Experiment results show that the unified DCT/IDCT architecture has low hardware complexity and high calculation accuracy.
Coded-Structured Light System Calibration Using Orthogonal Phase Shift Coding Combined with Zhang’s Method
Authors: Yu Xiao Yang , Meng Xiao Liang , Wu Hai Bin , Sun Xiao Ming , Wang Li
Published: July 2014

In coded-structured light three dimensional system, system calibration plays a vital role for the measurement accuracy. The camera calibration method is very mature, but the study about projector calibration is less. Therefore, this paper proposes a projector calibration method with simple calibration process and high accuracy. This method combines the Zhang’?s plane model calibration method with orthogonal phase shift coding. In calibration process, this paper uses phase shift coding pattern to establish the relationship of projector image and camera corner point coordinates. According to the image coordinates in the projector’?s perspective, we program and calculate the projector’?s internal and external parameters matrix based on the Zhang’?s plane model calibration toolbox. The results show that the proposed method is simple and flexible, the maximum relative error of the calibration parameters is 0.03%, and it meets the requirements of system calibration in medical or industrial fields.
A Image Retrival Method with Multi-Features Based on Dempster-Shafer Theory
Authors: Ji Meng , Sun Xiao Ming , Chen Xin , Qi Li Jun , Bao Lei , Huang Lei
Published: July 2014

Image content based retrieval is an important research area with application to digital libraries and multimedia databases. Its image characterization and similarity measure must closely follow perceptual characteristics. In this work, a new image retrieval method is proposed by combining color features and texture features based on Dempster-Shafer (D-S) theory. In this proposed method, Multi-color features included color histogram, color moment and color correlogram are used for color analysis, and gabor wavelet features is employed for texture analysis. Then these features are modeled as a mass function in evidence theory, and color and texture detection results are fused at decision-making level. The experimental results show that the proposed method takes advantage of the respective merits of color and texture features and therefore improves retrieval accuracy and reduces recognition error rate.
Design and Implementation of GPS L2C Signal Tracking Algorithm
Authors: Zhu Xue Fen , Shen Fei , Yang Yang , Yang Dong Rui , Chen Xi Yuan
Published: July 2014

The study of GPS L2C signal tracking algorithm aims to realize signal tracking in poor environment. The main topic includes L2C signal tracking principle and the performance of real signal tracking. The structure and applied background of the signal is stated in the introduction at first. The characteristic of time division multiplexing of CM code and CL code makes this tracking method utilize half of received energy inevitably. Then, as compositions of L2C signal tracking algorithm, the data demodulation, the code tracking and the carrier tracking module are showed their details in the paper, including the structure of the DLL tracking loop, the Costas carrier tracking loop and some necessary computational principles. Finally, compare happens on real excellent and poor signal-to-noise ratio environments by setting suitable parameters including the sampling frequency, the center frequency and the pseudo code rate to prove the effectiveness of tracking algorithm.
The Research of Multi-Points Sources Signal Power Synthesis Technology
Authors: Liu Qi Bo , Zeng Fang Ling , Chen Qiu Ju
Published: July 2014

This article introduces the basic principle and theory model of the crossbeam space power synthesis, and presents the result of system simulation and analysis. The author has adopted random sparse disposal and compounded the multi-points sources of transmitted power in space, through controlling the accurate orientation of the beam, reaching the aim of enhancing power. Meantime, arbitrary distributed array has been adopted to make the system more practical.
Implementation of FFT Algorithm Based on IP Core
Authors: Ma Cheng , He Ze Long
Published: July 2014

—In this paper, we propose a new way to implement the FFT Algorithm, which based on FPGA. At first we introduce the theory of FFT algorithm and its applications. Then the features of FFT IP core based on Altera FPGA is discussed. We elaborate the usage method of the customizable Altera FFT MegaCore function. A logic state machine is designed to create some command signals of this FFT IP core. Finally we use simulation tools Signal-Tap in quartus II inviroment to simulate and debug our FFT control module’s function. The result shows that this new control method of FFT IP core is feasible.
A Modified DFE-MMSE Equalization Algorithm
Authors: Xia Yu , Ye Fang , Li Yi Bing , Wang Ling
Published: July 2014

In wireless communication, inter symbol interference (ISI) and signal distortion are often caused by the frequency deviation and time offset of wireless channel. To eliminate or reduce ISI, people proposed the channel equalization technology. However, traditional decision feedback equalization algorithm based on MMSE criterion equalizer (DFE-MMSE) often introduces the error diffusion which degrades the performance of the equalizer in iterative system. In this paper, we propose an improved DFE-MMSE algorithm to reduce the error diffusion and improve the performance of iterative equalization, with a correction factor. Simulation results show that our algorithm achieves better bit error rate, which makes it competent in more practical cases.
The Effects of RB Usage on Single User Rate in TD-LTE
Authors: Li Ting
Published: July 2014

Resource Block (RB) allocation effects network coverage and throughput. The impact principles are analyzed in theory. Exist TD-LTE network data is collected, organized and analyzed. The results show that the effects of RB allocation on user rate in downlink is greater than uplink and uplink RB usage is more stable.
Modified Fast Directional Multilevel Algorithm for Analysis of Scattering of Microstrip Patch
Authors: Chen Hua , Jie Fan Yong
Published: July 2014

In this paper, the modified fast directional multilevel algorithm (FDMA) is presented for analyzing microstrip patch. The FDMA has been successfully applied to analyze scattering in free space and then it was extended to solve mircrostrip problems. The quad-tree structure is used in this method, which is the same as that in fast multipole method. In our method, the finest level group size can be set smaller than 0.2λ without suffering from subwavelength breakdown. The resulting algorithm has the memory requirement and the CPU time per iteration proportional to O (NLogN), where N refers to the number of unknowns. Numerical results of microstrip structures are presented to show the efficiency of this method
Design of Music Prescription for Music Electroacupuncture Instrument
Authors: Wang Can Hua , Du Jian Qiang , Zhang He Lin
Published: July 2014

As a physical therapy way,music therapy has been widely used. The choice of music is very important during treatment because different music has different curative effect. However, the choice of music often come to depend on people's subjective feeling and the theoretical foundation why the music is chosen is unknown. In this paper, the choice of music,i.e. music prescription,is considered from the following three aspects.Firstly,the power spectral density of the music must satisfy the 1/f fluctuation law.Secondly, the relationship must be ascertained between the frequency of the music and symptoms.Thirdly, melody and rhythm of the music should be choosen for different symptoms. Clinical test show that the scheme in this paper is feasible and the treatment effect is significant.
Solar Tracking Device Based on Electronic Compass and Accelerometer
Authors: Zhang Zhong Ran , Ma Yuan , Jiao Bo , Liu Tong Liang
Published: July 2014

A solar tracking device was designed in this paper. First, In order to determine the initial direction of the mechanism and the east, HMC5883L was used for measuring the magnetic field of earth. Then, the mechanism began to operate according to the solar position which was confirmed though the astronomical calculation. Finally, the azimuth and the elevation angle of solar were measured and corrected by HMC5883L and MPU6050 respectively. HMC5883L was calibrated by the ellipse fitting, which was obtained though the least square method. The horizontal error of HMC5883L was compensated. The experimental study was performed. And the results show that the solar tracking device has the characteristics of stable operation, high flexibility and low requirement of installation precision.
The Analysis of the Phase Noise of the Closed-Loop Driver Circuit in Micromechanical Gyroscope Based on the Phase-Locked Principle
Authors: Wang Guan Shi , Liu Xiao Wei
Published: July 2014

Compared with the closed-loop drive circuit in micromechanical gyroscope of AGC principle, the closed-loop driver circuit based on the phase locked principle can overcome its shortcomings which cannot control the frequency characteristics of the output signal, reducing the frequency deviation and the frequency jitter of the output signal, and shortening the settling time of the closed-loop drive system. In this paper, the noise of the closed-loop phase drive circuit based on phase locked principle is analyzed and deduced its phase noise expressions.
Development and Research of Open CNC System Based on Motion Controller
Authors: Zhang Hang Wei , Chen Chan Juan
Published: July 2014

A lab platform of Open Numerical Control System was designed to develop NC system based on PC and Motion Controller, a Master-Slave control system. The user interface application software was developed by C++ Builder and WINDOWS. It realized explanation and testing for bug function, data pretreatment function, NC code translation, NC simulation and execution, as well as motion controller function.
Application of the K-Means Immune Particle Swarm Optimization Algorithm in the Steam Generator Water Level Control
Authors: Sheng Gui Min , Xue Yu Cui , Zhang Bo Yang
Published: July 2014

The Stability of SG water level plays an important role in the safety of nuclear power plants, but tuned the parameter of water level PID controller is hard. Proposed a novel algorithm, KIPSO, which tuning PID controller parameters. Determine the cluster centre through K-means value cluster algorithm, and take the cluster territory as the characteristic value of vaccine set, enhance the vaccine multiplicity. Updated vaccine extraction by self-adaptive method, improved the convergence and adaptability. Analyzed the algorithm robustness in detail, and gave the rule which the immunity selection parameter. The simulation results shows: compares with the PID controller whose parameters are tuned by ZN method, KIPSO have a smaller overshoot, a better stability, and a shorter adjustment time. The simulation results show that the proposed method is effective for tuning PID parameters.
Impact Velocity Analysis of Capacitive RF-MEMS Switch
Authors: Wu Rui , Song Ming Xin
Published: July 2014

Impact velocity is an important performance parameter for capacitive RF-MEMS switch. This paper establishes a differential equation, in order to analyse the influencing factors of impact velocity. The simulation results show that impact velocity can reach 1.5m/s when bias voltage equals to 0.7V, frequency equals to 3×105Hz, voltage type adopts rectangular wave.
The Design of Wind Control LED Display System Applied on Ice Lantern
Authors: Lan Lan , Cao Yi Jiang , Cao Jia Mu
Published: July 2014

This paper presents a LED display system triggered by the natural wind which can be used for ice lantern, the system includes a signal detection unit, control unit and LED display unit. When the system detects a natural wind signal , the center control module will make a signal processing for the signal, LED display module set the display mode according to the results of processing options, the display modes include the following, the LED lamps sequentially turned on in accordance with wind direction, or make the pattern presetting on the LED array move with the natural wind direction , when the natural wind signal is very weak, system will control LED array display static pattern. A stable system model is realized in accordance with the design requirements, after testing, system performance is stable, reached the set requirements.
Design of the Pulse Wave Digital Filters Based on MATLAB
Authors: Zhang He Lin , Zhang Guo Long , Zhang Kang
Published: July 2014

Quality of human pulse waveform graph determine the results of the disease analysis and affect disease diagnosis accuracy，Through the MATLAB software design of a digital filter is used to filter the pulse signals, Optimizing the pulse waveform graph. And the simulation test of digital filter, results showed that filter completed the pulse wave denoising.
Measuring the Submarine’s Induced Magnetic Field by Geomagnetic Simulation Method
Authors: Zhang Zhao Yang , Yi Jun
Published: July 2014

The induced magnetic field is an important parameter in submarine degaussing, the measurement of which by course-changing method now wastes much time and force. By analysing the producing and measuring theory of the induced field, a method for measuring the submarine’s induced magnetic field by geomagnetic simulation was founded. The geomagnetic field can be changed by galvanizing the geomagnetic simulation loops, and the submarine’s induced field can be calculated according to the change of the submarine’s field before and after galvanizing, which can achieve the goal of fast measuring the submarine’s induced field. The experiment of the mockup showed that the method is feasible, and the submarine’s induced field can be measured fast and accurately. In the actual measuring of submarine’s induced magnetic field and degaussing work, the method has important application value.
Research on Small-Capacity Capacitor Type Sensor Detection Method
Authors: Hu Wei Tong , Zhang Yu Xuan , Sun Yan , Liu Wang Sheng , Zhang Li Zhong
Published: July 2014

In the field of industrial measurement, capacitive sensors are widely used. In many types of capacitive sensors, the output capacitance value range of many sensors is very small, generally between 10pF to 1000pF, but accuracy is usually required to be more than one thousandth. The conventional method of detecting capacitance value is generally the capacitor charge and discharge. By charging and discharging time statistics and calculations, capacitance values are deduced finally. The inherent disadvantages of this method are: (1) Temperature drift of the measurement circuit is large. (2) The spatial magnetic field under special circumstances impact on measurement circuit. (3) Long-term stability of the device will deteriorate. In this paper, a "capacitance measurement method with reference and comparison" is summed up through a lot of measurement experiments of humidity capacitance, that method can eliminate three kinds of defects in the capacitor charging and discharging process.
The Design of Wireless Video Monitoring System Based on FPGA
Authors: Yue Ya Jie , Zhang Xiao Jing , Sha Chen Ming
Published: July 2014

The wireless video monitoring system contains the video acquisition device,video transmission device,video storage device and VGA display device.In this paper,we use video acquisition device to collect video siganals in real-time.The analog video signal is transmitted by using wireless technology.The video signal is converted to a digital signal by using the dedicated A/D chip. At the same time ,the YCrCb signals will be converted into RGB signals by the format converting module.Then,the digital RGB signals are converted to analog RGB signals through the D/A,and they are finally displayed on the VGA monitor in real-time.The design mainly uses the wireless transmission technology to transmit analog video signals and uses ADV7181 to decode.The controlling system of FPGA deals with the decoded digital signals which will be transmitted to the D/A and the data finally will display in real time.
Evanescent Field Absorption Sensor Based on Special U Shaped Optical Fiber
Authors: Liu Chun Lan , Zhao En Ming , Li En Tao , Zhou Ai , Yang Xing Hua
Published: July 2014

In this article, an evanescent field absorption sensor based on special U shaped optical fiber is proposed. This optical fiber has a hollow structure and an inner core in the cave. The methylene blue is absorbed into the optical fiber and the absorbance is tested. Results show that the value of the absorption will reflect the concentration of the concentration of methylene blue in optical fiber.
The Control Technology of the Z-Source Three-Phase Four-Leg Inverter Based on Computer Simulation
Authors: Su Ming , Ma Xue Yan , Sun Yan
Published: July 2014

Z-source inverter can boost the voltage of the DC-side, allow the two switches of the same leg conducting at the same time and it has some other advantages. The zero-sequence current flows through the fourth leg of the three-phase four-leg inverter so the three-phase four-leg inverter can work with unbalanced load. This paper presents a Z-source three-phase four-leg inverter which combines a Z-source network with three-phase four-leg inverter. The circuit uses simple SPWM modulation technique and the fourth leg uses fully compensated control method. The inverter can maintain a symmetrical output voltage when the proposed scheme under the unbalanced load.
The Research of Conventional Weapons Proving Ground Information System Construction
Authors: Zhang Xiao Ying , Lu Kun , Wang Huai Jun , Ma Hai Hui
Published: July 2014

In order to meet our military weapons of information-based development, reform methods and models of proving ground test, improve function test of the technology and tactics and combat efficacy evaluation of weapons, this article proposed ideas and methods of conventional weapons proving ground transformation based on HLA. This article based on the basic concepts, methods and principles of HLA, introduced to the HLA simulation architecture in information proving ground building. This page analyzed and designed the information system of proving ground.On this foundation, system structure of the system was built,and the realization method of federation members’ classification and the design of FOM / SOM and members’ interface were introduced.