bluuebunny/crossref_metadata_2025 huggingface dataset:
The Inheritance and Development for Wooden Roof of the Traditional House in Nyingchi, Tibet
Authors: Ma Ke , Liu Ben Teng
Published: June 2011

The wooden tile is gradually replaced by color steel sheet of traditional houses roof in Nyingchi area. This technique is effectively to solve the problems due to the large rainfall in that region. However, it also causes damage to the architectural traditional features. This paper discusses the relationship the roof material and natural environment firstly. Then, put forward a more appropriate roof technique to improve waterproof and protect wooden tiles, thus to inherit the traditional architectural form.
Research of New Countryside Settlements Planning and Architectural Design under Eco-Design Strategy - Case Study with Countryside Settlements in GuanZhong Area
Authors: Liu Qi Bo , Zhao Jing Yuan
Published: June 2011

Construction of new design scheme in new countryside settlements should be closely around the "people-oriented and environment-centric" design concept under eco concept, with it building a sustainable village living environment system. This paper through a large number of field research and scientific research, uesd rural settlements in Guanzhong area as case study, under eco-design strategy to construct design mode of settlements planning and architectural design. And used the typical village - “Donghan”village as an example in keeping with the practice of the mode. It would have certain theoretical and practical guiding significance for the sustainable development of ruralcountryside settlements.
Formation, Declination and Rebuilding of City Features
Authors: Li Xu , Zhao Wan Min
Published: June 2011

Feature decline is a common phenomenon in our city nowadays. Taking the cities in southwest china for example, this paper discusses conception and formation of urban morphology,sums up the influencing factors, and concludes the law that urban morphology fits the function, adapts to the environment. Furthermore, it also discovers the mechanism that explains how all this happens. Then, the paper analyses the reasons of feature decline, gets the inspiration that the aim of building characteristic city is not chasing some certain shape, but inheriting and developing the way of making use of nature, building city which satisfying the function and environment.
Performance Testing of a Thermoelectric Cooler for Medical Application
Authors: Wang Fu Jen , Chang Jung Chieh , Lin Kuo Chien , Yau Yat Huang
Published: June 2011

Thermoelectric cooler has the advantage of being portable, simple, compact, noiseless, reliable, and environmentally benign. It is quite suitable for transporting and storage for bio-medical products (such as vaccine and blood) which are very sensitive to temperature variation. However, the coefficient of performances (COP) and the cooling capacity of the thermoelectric coolers available in the open market are relatively low. In this study, the effort will be focused on the design of the heat transfer aspect for a thermoelectric blood cooler specific for bio-medical application. Optimized thickness at 0.0025m of a plate fin with length at 0.598m could be obtained through heat transfer analysis. Performance tests have been conducted to investigate the influence of cabinet temperature in the thermoelectric blood cooler. Experimental tests revealed the optimized plate fin can provide satisfactory cooling performance, and to cool down the cabinet until 2°C within 40 minutes. Some tests including different voltage input, loading condition and ambient temperature tests for blood storage have been conducted as well to validate the quality of blood cold chain storage. It is expected that the developed thermoelectric cooler for blood cold chain system will perform stable cold storage and precise temperature control specific for medical application.
Protection and Utilization Research of Qingdao Historical Celebrities' Former Residences
Authors: Yu Hong Xia , Xu Ke Feng
Published: June 2011

China Qingdao has large quantities of historical celebrities’ former residences. How to prompt the relative protection and rational utilization in which the historical and cultural value could be retained has become a vital challenge that needs to respond. Through the fieldwork, this dissertation introduced the present situation in detail, consulted both the domestic and foreign practical experience, and put forward personal understanding towards the effective means to protect and utilize the historical celebrities’ former residences in Qingdao.
Sinkage of a Chinese Ancient Rampart Soil by Simulation
Authors: Zhou Qian , Yan Wei Ming
Published: June 2011

To protect Chinese ancient building an ancient rampart in the Forbidden City was taken as an example to study sinkage of soil in it as well as effects the sinkage may bring to the rampart.Considering hole at different depth of the soil as well as mechanical parameters for soil and masonry wall,finite element model of the rampart was built.3 cases including weight of soil and wall,live load and rainwater penetration condition were considered to study the deformation,stress and strain of both wall and soil by simulation.Results show that the existing holes affect little to sinkage of the soil,while rainwater penetration is the main cause for sinkage of soil.Thus waterproof work has to be done to solve the problem besides controlling live load on the rampart.
The Planning Strategy of Public Rental Housing in the Perspective of Residential Segregation - Taking Metropolitan Area of Chongqing as an Example
Authors: Xu Yu Hui , Lv Yan Ke , Huang Ying
Published: June 2011

Along with the Reform and opening-up and the establishment of Market Economy, the economy and living standards of our citizen are improving, nonetheless the gap between rich and poor is widening in the society, so the social groups is gradually getting differentiation. Especially the perspective of residential segregation with live position and live quality for represent. At the same time, the construction of the public rental housing which become the current social hot point usually neglect the social influence resulted by residential segregation. Taking the public rental housing in metropolitan area of Chongqing as an example, the paper tallies up the successful strategy of the construction of public rental housing from address and construct mode, land and funds cost, guarantee object and facilities kit in order to guide the construction of the public rental housing from residential segregation to residential introjection.
A New Spectral Representation of Earthquake Recordings Using an Improved Hilbert-Huang Transform
Authors: Huang Tian Li , Ren Wei Xin , Lou Meng Lin
Published: June 2011

A new spectral representation method of earthquake recordings using an improved Hilbert-Huang transform (HHT) is proposed in the paper. Firstly, the problem that the intrinsic mode functions (IMFs) decomposed by the empirical mode decomposition (EMD) in HHT is not exactly orthogonal is pointed out and improved through the Gram-Schmidt orthogonalization method which is referred as the orthogonal empirical mode decomposition (OEMD). Combined the OEMD and the Hilbert transform (HT) which is referred as the improved Hilbert-Huang transform (IHHT), the orthogonal intrinsic mode functions (OIMFs) and the orthogonal Hilbert spectrum (OHS) and the orthogonal Hilbert marginal spectrum (OHMS) are obtained. Then, the IHHT has been applied for the analysis of the El Centro earthquake recording. The obtained spectral representation result shows that the OHS gives more detailed and accurate information in a time–frequency–energy presentation than the Hilbert spectrum (HS) and the OHMS gives more faithful low-frequency energy presentation than the Fourier spectrum (FS) and the Hilbert marginal spectrum (HMS).
Analysis of the Dynamic Response of Underground Structures under Internal Explosion
Authors: Ning Peng Fei , Tang De Gao
Published: June 2011

Analytic solution for the dynamic response of underground structure is generally based on the theory of cylindrical shell. The underground structure constructed to resist internal blast is not suitable to be treated as cylindrical shell structure and is difficult to get analytic solution. In this paper, finite element code LS-DYNA is employed to calculate the dynamic response of underground blast-resistant structures exposed to internal blast. Two structures with different thickness buried in four types of surrounding rocks are calculated, and the influence of the surrounding rocks to the dynamic response of underground blast-resistant structures is analyzed.
Structural Dynamic Characteristics Determination Using Response Data in Small Earthquakes
Authors: Gong Mao Sheng , Sun Jing , Xie Li Li
Published: June 2011

The objective of the paper is to determine the structural dynamic characteristics from the low level structural seismic response data in small earthquakes. The off-line time-domain system identification method ARX (AutoRegressive with eXternal input) model is adopted to identify the time-invariant transfer functions, and then the structural parameters such as modal frequencies and damping ratios are determined. A 7-story reinforced concrete structure on which the strong motion monitoring system was installed and recorded seismic response in 3 small earthquakes was used for the analysis. It is found that the structural dynamic characteristics can be determined from low level acceleration response records in small earthquakes in which the structure can be assumed as a linear and time-invariant system. The results can be referenced by structure health monitoring, structural control and related works.
Tensile Test of the Fireproof Lining of Tunnel
Authors: Yao Rong , Peng Dong Ling , Huang Hong Yuan
Published: June 2011

The tensile fireproof lining of tunnel test has been done in orthogonal method with a custom-made fast fluctuation thermostat type resistance furnace which the maximum temperature may arrive 1200 °C , the heater was put for heating by choosing the RABT curve, the test result was analyzed, the ratio of tensile strength loss is changed with the meter of the polypropylene textile fiber, the silica flour and the carbon fiber, there is a optimality proportion when the ratio of tensile strength loss is low.
Study on Applicability of Equivalent Single Degree of Freedom Methods for Single Column Pier with Uniform Cross Section
Authors: Chen Liang
Published: June 2011

Applicability of the simplified method based on equivalent single-degree-of-freedom (ESDOF) for single-column pier with uniform cross-section is investigated in this paper. The modal participating mass ratio of pier’s fundamental mode is taken as an index to evaluate the applicability of the simplified method. Based on the fundamental mode shape functions selected deliberately in the first step, equations to evaluate the modal participating mass ratio of pier fundamental mode is obtained. Using the proposed equations, it is convenient to evaluate applicability of the simplified method with the height of the pier and the ratio of the linear mass along the column to the dumped mass at the top of the pier. Finally, the index is verified in the different nonlinear range of piers.
Free Vibration Analysis of Orthotropic Circular Membranes in Large Deflection
Authors: Zheng Zhou Lian , Song Wei Ju , Liu Chang Jiang , Xu Yun Ping , Long Jun
Published: June 2011

This paper reviewed the research on the vibration of orthotropic circular membrane. We applied the large deflection theory of membrane and principle of virtual displacement to derive the governing vibration equations of circular membrane, solved it, and obtained the power series formula of nonlinear vibration frequency of circular membrane with all edges fixed. The paper gave the computational example and compared the frequency with different initial displacements, respectively. Results obtained from this paper provide some theoretical foundation for the research of orthotropic composite materials; meanwhile, the results provide some theoretical foundation for the research of nonlinear vibration of membrane.
Dynamic Performance Analysis of Roof Structure with Steel Tubular Arch-Truss
Authors: Yuan Jian
Published: June 2011

An arch-truss roof structure with circular steel tube is applied to a gymnasium, which is supported by two three-dimensional trusses with square steel tubular, and the connections between arch-truss and spatial truss are set to hinged supports. Natural frequency and modes of this overall roof structure are analyzed, and time-procedure analysis is acted by applying ANSYS software. The analysis results demonstrate that this roof structure has larger stiffness, and its maximum node displacement under earthquake can meet the requirements.
Research on Dynamic Factor of the Column with Different Constraints Subjected to Blast Shock
Authors: Jiao Yu Feng , Hou Yan Li , Wei Xue Ying
Published: June 2011

In this paper, the finite element program LS-DYNA was used to simulate the dynamic response of RC column with different constraints subjected to blast pressure. Through analyzing the five group columns with fixed end as well as one end fixed and one end simply supported, the maximum middle displacement and its relation with T/Tω were obtained. Thereby the dynamic factor of the column under blast pressure was acquired. Consequently the displacement response spectrum curve of the column was drawn. The results provide reference value to the design and protection of the RC column.
Structural Modal Analysis Based on HHT and Butterworth Filter
Authors: Cui Ding Yu , Xin Ke Gui , Qi Quan Quan
Published: June 2011

Structural signal is taken self-adaptive decomposition by Hilbert-Huang Transform mainly composed of the EMD(empirical mode decomposition) and HT(Hilbert Transform), which is especially suitable for structural projects in the non-linear, non-stationary signal analysis through local characteristic. However, some weak signal may be ignored by EMD resulting in modal missing. Butterworth filter is an electronic filter designed to have flat frequency response. Considering the influence of noise , Hilbert-Huang Transform and Butterworth band pass filter are applied together to process the structural signal in order to obtain the frequency, damping ratio and mode shapes of the structure more precisely in this paper. Numerical Simulation results show that the proposed method in this paper could identify the modal parameters effectively and accurately.
Numerical Analysis of the Rural Building due to Flood Impact
Authors: Xiao Shi Yun , Sun Yun Fei
Published: June 2011

The impacting action of flood destroyed dramatically the rural buildings. In this paper, the rural building was analyzed numerically to investigate the destruction of rural building due to the flood impact. The rural building was discretized into 7950 8-node block elements and 4098 Goodman elements to simulate the brick and mortar respectively. The rule impact loading of flood on rural building was calculated using the criterion of gravity similarity according to test results. Finally, the stress, the displacement and the failure process of the rural building are studied. Firstly, the mortar element locates on the wall between the door and the window failure and more and more mortar and brick elements failure with the increasing loading. Finally, the right wall was damaged because the door and the right window decreased its stiffness. Because the failure mortar and brick elements decrease the stiffness of the structure, the displacements of the rural building increased nonlinearly with the increasing loading.
Steel Cofferdam Design and Calculation for High Pile Cap Construction
Authors: Xia Gui Yun , Yang Mei Liang , Li Chuan Xi , Lu Shang Wu
Published: June 2011

Using the steel cofferdam of Xinzhao Pearl River Bridge in Guangzhou City as the engineering background, structural designing and size proposing of steel cofferdam are introduced briefly. To ensure structural safety, general purpose finite element software Ansys was used to analyze structural strength and stability. Load styles and boundary conditions were also discussed. 6 load cases with calculating model were presented.
3D Modeling of Complicated Geological Body in Numerical Software
Authors: Yu Dong Ming , Yao Hai Lin , Chen Feng Guang
Published: June 2011

This paper provides a simple and effective modeling method for complicated geological bodies in numerical software. By means of the most common tool software, the high quality 3d numerical model of the complicated geological body in the geotechnical engineering was built quickly and easily in the numerical software, ANSYS. Furthermore, this numerical model was reproduced in other numerical software, FLAC3D and ABAQUS. It is achieved that the 3d numerical model is shared among the numerical software, ANSYS, FLAC3D and ABAQUS and a basis is supplied for numerical calculation. The modeling method in this paper is of practical significance.
The Research on Application of Strength Reduction Finite Element Method in Stability Analysis of Weak Intercalated Rock Tunnel
Authors: Shi Da Kun , Zhang Yang Song
Published: June 2011

Based on geologic condition of one tunnel surrounding rock mass, systematic numerical tests had been carried out to study the stability of surrounding rock mass with different distributions of weak intercalated rock by the FEM software ABAQUS and strength reduction finite element method. Some quantificational results about the stability of surrounding rock mass were summarized. And the safety factor and latent slip surface were worked out. The stability of surrounding rock mass was judged by strength reduction finite element method. According to the analysis above, it’s known that the discrepancy of two rules is small; the safety factor is the lowest when weak intercalated rock in vault, and when at bottom, it’s higher than that of in vault. The conclusion can be used to guide the procedure of construction and ensure the safety.
Structure Statics Finite Element Model Updating Based on Response Surface Methodology
Authors: Deng Miao Yi , Li Guang Hui
Published: June 2011

Employing response surface method, the complicated implicit relationship between bridge structural static-load responses and structural parameters is approximately represented by the simple explicit function. Based on this response surface model (function), the structural finite element model parameters can be easily updated by selected optimization procedure. By a numerical example of a two-span continuous beam, the essential theory and implementation of structural static response surface based finite element model updating are presented in the paper.
Effection of Relevant Parameters of Infilled Frame Wall on its Structural Lateral Stiffness
Authors: Liu Shi Mei , Huang Dong Sheng
Published: June 2011

Statical analysis of infilled frame structure was conducted on 3D finite element models by means of software ANSYS10.0. Analyses on relevant parameters of infilled frame walls with or without openings have been carried out seperately, and it is found that the relevant stiffness of the model gradually increases with the ratio of the wall’s width to its height. However, the effection of the width to height ratio of the wall on its structural lateral stiffness becomes much smaller when the value of the width to height ratio is larger than 1.5. The effection can be basically ignored when the width to height ratio is larger than 1.8. It is investigated that the ratio of posts inertia moment to beams has great influence on model’s relevant stiffness. The relevant stiffness of frame structure decreases with the growth of the ratio of posts inertia moment to beams (I2/I1). For a long time, Filling Wall is widely used in multi-storey buildings and Civil Construction Structures, for its flexible architecture flats and large interior space, etc. However, because of the imperfection in analysis methods and the defects in model, pure- framework design is used in civil architectures, and the weight of filling wall is calculated by converting to the Line Load on the beam. According to the analysis of 5.12 Wenchuan earthquake[1], the early filling wall absorbs a large earthquake because of its stiffness, while its Adhesive Tensile Strength is low, which making the earthquake-damage to the filling wall is more serious than that to the frame structure. By analyzing the parameters in non-opening and opening filling wall and changing a given parameter, while keeping other parameters unchanged. This paper studies the influence on the Lateral Stiffness of Frame Structure, to provide Earthquake Fortifying Areas with reference data in the design process of filling wall.
Gait Recognition Algorithm Based on the Trajectory of Tiptoe
Authors: Li Yi Bo , Yang Qin
Published: June 2011

Most researchers focus on the gait characteristics of hip and changed angle of knee joints, gait characteristics of foot is still less attention, also apply wavelet packet to analysis more detailed information of characteristics’ data, and use the support vector machine algorithm to reduce the randomness, it has their unique advantages in the small sample. Summarized the above three points of the paper, the paper proposes a new gait recognition method to extract trajectory of tiptoe, uses wavelet packet to analyze it, then applies SVM for classification and recognition. Tested at the NLPR database of Chinese Academy of Sciences of 45 camera angle, we observed that the recognition rate has significantly increased, we observed that the algorithm is an effective identification method.
LS-SVM Based Self-Learning Tremor Controller for Microsurgery
Authors: Liu Zhi , Wu Qi Hang , Zhang Yun
Published: June 2011

One of the main problems for effective control of a minimally invasive surgery (MIS) is the imprecision that caused by hand tremor. In this paper, a novel adaptive filter, the least squares support vector machines adaptive filter (LS-SVMAF), is proposed to overcome this problem. Compared with traditional methods like multi-layer perceptron (MLP), LS-SVM shows a superior performance of nonlinear modeling with small scale of data set or high dimensional input space. Simulation results demonstrate the effectiveness of the proposed filter and its superior performance over its competing rivals.
The Symmetrical Variation of 2DPCA for Face Recognition
Authors: Yue Zeng , Feng Da Zheng , Li Xiong
Published: June 2011

This paper first discusses the relationship of Principal Component Analysis (PCA) and two-dimensional PCA (2DPCA). For 2DPCA eliminating the some covariance information which can be useful for recognition, The symmetrical Variation of 2DPCA for Face recognition (V2DPCA) is proposed. These experiments on both of ORL face bases shows improvement in recognition accuracy, fewer coefficients and recognition time over 2DPCA, and this algorithm is also superior to the traditional eigenfaces, ICA and Kernel eigenfaces in terms of the recognition accuracy.
Improving Relevance Feedback via Using Support Vector Machines
Authors: Chen Zi Long , Lu Yang
Published: June 2011

Traditional relevance feedback technique could help improve retrieval performance. It usually utilize the most frequent terms in the relevant documents to enrich the user’s initial query. We re-examine this method and find that many expansion terms identified in traditional approaches are indeed unrelated to the query and harmful to the retrieval. This paper introduces a Support Vector Machines Based method to improve the retrieval results. Firstly, the classifier is trained on the feedback documents. Then, we can utilize this classifier to classify the rest of the documents and move relevant documents to the front of irrelevant documents. This new approach avoids modifying the initial query, so it’s a new direction for the relevance feedback techniques. Our Experiments on TREC dataset demonstrate that retrieval effectiveness can be improved more than 24.37% when our proposed approach is used.
The Study on Mechanical Properties of Single-Bolted Steel-Glulam-Steel Joints
Authors: Xu De Liang , Liu Wei Qing , Zhou Ding , Ding Jian Dong , Lei Ying , Lu Wei Dong
Published: June 2011

Seven groups, total of 31 single-bolted steel-glulam-steel joints, were tested for their mechanical performance. The mechanical properties of single-bolted steel-glulam-steel connection subjected to a load parallel to the grain have been studied. The failure mode and failure mechanism of bolted connections were discussed in detail. It is shown that the failure mode, bearing capacity, stiffness and ductility of the joint are mainly relative to the thickness of the glulam and the diameter of the bolt. Due to the wide application of bolted steel-glulam-steel connections in engineering, the present work can be taken as a reference in manufacture, and design of modern timber structures.
A Real-Time Audio Watermarking Algorithm Based on MCLT
Authors: Zhang Qiu Yu , Huang Yi Bo , Deng Jia Bin
Published: June 2011

With the fast developing portable digital audio player, the copyright protection of music faces a severe challenge. Audio watermarking is an efficient approach to solve this problem. In order to improve the performance of real-time processing, a new real-time audio watermarking based on fast MCLT is presented. Algorithms, which use of quantitative method, can be realized watermark blind detection. The experiment results show that the algorithm, which is utilized in the copyright protection, meet the timely processing requirements. Embedded of watermark audio have obviously robustness and transparency compared to the traditional methods. Furthermore, it can against MP3 compression attacks efficiently.
Fingerprint Image Enhancement Algorithm Based on FDCT
Authors: Tao Chong Ben , Liu Guo Dong
Published: June 2011

Fingerprint enhancement is an essential preprocessing step and it is crucial for the efficiency of fingerprint recognition algorithm. We present an enhancement algorithm based on fast discrete curvelet transform (FDCT). First, implement positive transform on input image, namely decompose the image into coarse scales and fine scales coefficients. Then make use of a directional filter and a soft threshold function to enhance image and reduce noise respectively. Finally, implement inverse transform, and reconstruct the enhanced image. Experiments are carried out on FVC2004 databases. For bad quality fingerprints, the results indicate that the proposed algorithm has better enhancement and de-noising effect than traditional methods, and need less time.
An Image Retrieval Model Based on Local Fisher Discriminant Analysis
Authors: Wang Yong Mao
Published: June 2011

This paper introduces an image retrieval model based on dimensionality reduction. The proposed model is divided into two main techniques, the first one is concerned with the feature extraction from image database, and the second one is performing a dimensionality reduction. In the first technique, the color histogram and Color Texture Moment are used to extract the color and texture features, respectively. In the second technique, Local Fisher Discriminant Analysis (LFDA) which is a supervised linear dimensionality reduction algorithm is used to performing dimensionality. LFDA combines the ideas of Fisher Discriminant Analysis (FDA) and Locality Preserving Projection (LPP). LFDA can preserve both manifold of data and discriminant information. Experiments demonstrate that the proposed image retrieval scheme based on dimensionality reduction can achieve satisfactory results.
MEMS Gyroscope Null Drift and Compensation Based on Neural Network
Authors: Shiau Jaw Kuen , Ma Der Ming , Huang Chen Xuan , Chang Ming Yu
Published: June 2011

This study investigates the effects of temperature on micro-electro mechanical system (MEMS) gyroscope null drift and methods and efficiency of temperature compensation. First, this study uses in-house-designed inertial measurement units (IMUs) to perform temperature effect testing. The inertial measurement unit is placed into the temperature control chamber. Then, the temperature is gradually increased from 25 °C to 80 °C at approximately 0.8 degrees per minute. After that, the temperature is decreased to -40 °C and then returning to 25 °C. During these temperature variations, the temperature and static gyroscope output observes the gyroscope null drift phenomenon. The results clearly demonstrate the effects of temperature on gyroscope null voltage. A temperature calibration mechanism is established by using a neural network model. With the temperature calibration, the attitude computation problem due to gyro drifts can be improved significantly.
Colonial Competitive Algorithm Assisted Least Squares Support Vector Machines
Authors: Ren Yuan , Bai Guang Chen
Published: June 2011

The use of least squares support vector machine (LSSVM), a novel machine learning method, for classification and function approximation has increased over the past few years especially due to its high generalization performance. However, LSSVM is plagued by the drawback that the hyper-parameters, which largely determine the quality of LSSVM models, have to be defined by the user, and this increases the difficulty of applying LSSVM and limits its use on academic and industrial platforms. In this paper we present a novel method of automatically tuning the hyper-parameters of LSSVM based on colonial competitive algorithm (CCA), a newly developed evolutionary algorithm inspired by imperialistic competition mechanism. To show the efficacy of the CCA assisted LSSVM methodology, we have tested it on several benchmark examples. The study suggests that proposed paradigm can be a competitive and powerful tool for classification and function approximation.
Turing Instability and Hopf Bifurcation for the General Brusselator System
Authors: Guo Gai Hui , Li Bing Fang
Published: June 2011

The Brusselator system subject to homogeneous Neumann boundary conditions is investigated. It is firstly shown that the homogeneous equilibrium solution becomes Turing unstable or diffusively unstable when parameters are chosen properly. Then the existence of Hopf bifurcation to the ODE and PDE models is obtained. Examples of numerical simulations are also shown to support and supplement the analytical results.
Application Research of Fuzzy Control for AC Motor on the PLC Platform
Authors: Qin Li , Jiang Yu , Tan Xiao Xing , Li Li Yao
Published: June 2011

Due to the strong nonlinearity of the AC motor, it is difficult to obtain satisfied performance by the use of conventional PID control strategy. Self-adaptive control method is therefore needed to tackle with this problem. In this paper, a novel approach of fuzzy control is presented for the AC motor drives based on the PLC platform. The purpose is to enhance the speed control performance of AC motor by means of fuzzy logic. The hardware and software construction of the control system is described, and the fuzzy variables and fuzzy rules of the fuzzy controller are designed. Simulation test results show that the designed speed control system is efficient and reliable for the control of AC motor drives. Good performances such as faster dynamic response, smaller overshoot and higher accuracy compared with traditional PID controller are achieved.
Effects of Some Design Parameters on the Static Performance of the Truss String Structure
Authors: Huang Cheng Wei , Shao Rui , Zhang De Li
Published: June 2011

The beam string structure，a new self-balancing system is a combination of a string (Cable), pole and beam-column (beam, arch). Because the beam string structure make full use of tensile properties of high-strength cord, force became more reasonable, transportation became more convenient and construction became more simple for the new self-balancing system. The beam string structure became a new structure with a good value and prospects. In this paper the effects of the static performance of the single truss string structure are researched through analyzing the influence of prestressed cable, pole pitch, blow-span ratio of cable and cross-sectional area of cable using of finite element theory. The results of the reasonable selection of string truss design parameters a valuable reference.
A Inter-Subsystem Private Data Transfer Protocol Based on a New High Secure Computer Architecture
Authors: Sun Geng Xin , Shao Feng Jing , Bin Sheng
Published: June 2011

Focusing on the characteristics of the new high secure architecture of network computer, an operating system with internal network structure is designed. The operating system contains two subkernels: local kernel and network kernel, the two subkernels run individually in two subsystems. In order to communicate between two subsystems securely, an inter-subsystem private data transfer protocol is proposed and implemented in this paper. The private protocol is a connection-oriented protocol, it can provide reliable end-to-end connectivity Protocol format and protocol connection management based on signature verification are elaborated.
Dynamic Life Prediction of RC Structures on Multi-Environmental Time Similarity Method
Authors: Jin Wei Liang , Li Zhi Yuan , Chen Ju , Wang Jin Quan , Wang Xiao Zhou
Published: June 2011

Multi-environmental time similarity (METS) stepped forward for solving the key technique of service-life correlation of reinforced concrete (RC) structures exposed in artificially accelerated and real natural environment. Artificially accelerated tests and the similarity relationship between natural and indoor environment are used to estimate the prior information. Inspections of the real structure and concrete specimens are used to update the information and reduce the uncertainty in the service-life prediction. The progress of service-life prediction becomes dynamic and long-term.
A New Congestion Control Algorithm of CDMA Systems
Authors: Liu Peng
Published: June 2011

A new congestion control algorithm of code division multiple access (CDMA) is developed to reduce the cost of system. Firstly,the paper defines the utility function of resource throughout,and then set up the mathematics model according to the wireless resource characteristic. In the approach only the non-linear compensating term, solution of a sequence of adjoint vector differential equations, is required iteration. By taking the finite iteration of non-linear compensating term of optimal solution sequence, a suboptimal congestion control algorithm of CDMA can be obtained. It is proved by analysis in theory and system level simulation that the congestion control algorithm can enlarge system throughput while controlling system load.
Research of the Two-Vehicle Joint Operation Control System Based on Joint-Movement Navigation
Authors: Li Li Xin , Ding Dian Kuan , Li Hu Xiong
Published: June 2011

This article detailedly elaborated the design principles of the two-vehicle joint operating control system based on joint-movement navigation，meanwhile it presented the frame of hardware circuit and software design. Adopting passive acoustic detection triangulation technique and two- vehicle navigation by the same sound frequency and time-sharing operation, together with dynamic route optimization strategy, so as to make sure that the two-vehicle has a higher joint-movement speed and positioning accuracy, and it automatically avoids obstacles and site boundary.
A Content-Based Multilevel Caching Policy for Super-Peer Networks
Authors: Tan Yun Song , Wu Yun Tao
Published: June 2011

We propose a novel scheme, called Content-based Multilevel Caching Policy (CMCP) for super-peer networks that support hierarchical P2P architecture. Peers share information according the content between peers and between shared files to self-organise into clustered groups. Simulation experiments show that the CMCP policy achieves significant improvements in terms of access latency and global cache hit ratio.
Robust Watermarking Algorithm Based on Hilbert-Huang Theory
Authors: Deng Ming Hui , Zeng Qing Shuang , Zhou Xiu Li
Published: June 2011

In this paper, we introduce a robust image watermarking method based on Hilbert-Huang Transform (HHT) against geometric distortion. This watermarking is detected by a linear frequency change. The HHT transformation is used to detect the watermark. The chirp signals are used as watermarks and this type of signals is resistant to all stationary filtering methods and exhibits geometrical symmetry. In the two-dimensional Radon-Wigner transformation domain, the chirp signals used as watermarks change only its position in space/spatial-frequency distribution, after applying linear geometrical attack, such as scale rotation and cropping. But the two-dimensional Radon-Wigner transformation needs too much difficult computing. So the image is put into a series of 1D signal by choosing scalable local time windows. The watermark embedded in the HHT transformation domain. The watermark thus generated is invisible and performs well in StirMark test and is robust to geometrical attacks. Compared with other watermarking algorithms, this algorithm is more robust, especially against geometric distortion, while having excellent frequency properties.
Some New Security Strategies Description about Grid
Authors: Liu Yi He
Published: June 2011

The security strategy description is important contents of security access control research about grid. The strategy of traditional access control models has ignored the subject security, and can not be solved with the dynamic grid, and the characteristics of the coexistence of multiple security strategy etc problems. Regarding the concept of subject/ object decomposition and the organization classifications are defined, and the concepts of subject safe service, object safe service, and granularity control etc are expanded, Using the RBAC model and BLP the model basic principle, a group new access control security strategy based on the grid environment have be given in the paper. After discussion shows that the new rules emphasis on the subject security, and adapt to the dynamic nature of grid environment and characteristics of the coexistence of multiple security strategy. The new rules are compatibility with existing network access control model, they are secure and are also an expansion under the common network environment access control strategy, and this has certain positive significance to the grid security research.
Seismic Performance of Haunched Beam Transfer Structures of Frame-Supported Short-Leg Shearwall with Varied Ratio of Short-Leg Shearwall Section Height to Thickness
Authors: Qi Yong , Zhu Ci Mian , Zhong Shu Sheng , Wang Fang , Xiang Yang
Published: June 2011

This paper deals with an experimental study on the seismic performance of haunched transfer beam structures with varied ratio of section height to thickness of short-leg shearwall (RHT). Based on the seismic tests of three 1:3-scaled specimens under low-frequency cyclic lateral load with constant vertical actions, the failure pattern, the hysteresis curves, the skeleton curves, the energy dissipation capacity, and the stiffness degradation laws of haunched transfer beam structures are investigated. The effects of different RHT (i.e., 5, 6 and 7) on the seismic performance of haunched transfer beam structures are emphasized and analyzed in detail. It is concluded that the rigidity of the structure is noticeable enhanced, the endogen force becomes more evenly distributed and the bearing is more rational with an increase of the RHT; the rationally designed haunched transfer beam structure has a good seismic behavior.
Application of Wavelet Transform Theory to Rayleigh Wave Exploration
Authors: Lin Jun Zhi , Zhao Ming Jie , Wu De Lun , Liu Xin Jian
Published: June 2011

Based on researches on conventional analytical method of the Rayleigh wave testing data, the wavelet theory is introduced to analyze the data and we find that wavelet components of the Rayleigh wave testing data on the scale of 2-1and 2-2are high frequency interference, so we omit them. Afterwards, the coherent analysis, phase-different analysis and power spectrum analysis of the smoothing signal on the scale of 2-2are made to obtain the frequency dispersion curve, which is smoother and more reasonable than that obtained without using wavelet denoising. Besides, the testing data of shear wave is closer to the calculated value. The results indicate that applying wavelet analysis to the disposal of the Rayleigh wave testing data works efficiently.
Experimental Study on Three-Dimensional Base-Isolated Model with 3DIB
Authors: Zhao Ya Min , Su Jing Yu , Lu Ming
Published: June 2011

A new 3-dimensional isolation bearing (3DIB), which is combined with lead rubber bearing (LRB) and disk spring bearing (DSB), is introduced in this paper. A series of shaking table tests of the 1/2 scale fixed-base and 3DIB base-isolated model were compared to confirm the validity of the 3DIB. Results show that the 3DIB can isolate 3-dimensional earthquake energy remarkably. Large displacement of the 3DIB base-isolated system occurred on the isolation layer, and the inter-story deformation of the superstructure changed slightly. The horizontal acceleration responses of 3DIB model decreased more than 60% and the vertical acceleration responses decreased more than 50% under the severe earthquake of 0.4g in PGA input, which confirmed that 3DIB could isolate both the horizontal and vertical earthquakes obviously.
The Influence of Column-to-Beam Strength Ratio on Seismic Performance of Concrete Filled Tube Moment-Resistant Frames
Authors: Mou Ben , Xu Pei Zhen , Wu Xia , Gao Dai Ming , Zhang Lai Cheng
Published: June 2011

The seismic responses of 6-storey frame structures which are designed by means of beam yield mechanism (BYM) and column yield mechanism (CYM) are compared by using pushover analysis and dynamic analysis. This paper discusses the influence of column- to- beam strength ratio on seismic performance of concrete filled tube moment-resistant frames and analyzes the probability of the column yield mechanism. The results indicate that the strength ratios between columns and beams in a layer are effective parameters and of great significance to form yield mechanism.
Correlation between Damage Indexes in Knee Bracing Frames Subjected to Earthquakes
Authors: Faraji Kamran , Miri Mahmoud
Published: June 2011

For vulnerability assessment of structures, different damage indexes have been established by researchers that estimate the structural damage level. In these indexes different parameters have been used for calculating structural damage level. In this paper, damage indexes based on deformation, energy and cycle hysteretic behavior are investigated in order to find a correlation between their numerical values. The selected damage indexes are calculated and compared by applying them in nonlinear time history analysis of low and intermediate rise knee braced steel frames subjected to a set of seven earthquake accelerograms. Correlations between various indexes have been presented graphically and approximate conversion formulas are also provided.
Damage Analysis of High-Rise Building under Seismic Action Based on Damping Ratio Measurement
Authors: Liu Cheng Qing , Xiao Xin Long , Liang Rui , Zhao Shi Chun
Published: June 2011

Based on the current methods of damage detection, a new detection damage model was proposed in order to search a more efficient detection method for reinforced concrete high-rise building damage induced by earthquake. This model is based on the regularity of change in the damping ratio of high-rise buildings, and the high order modes, mode participation coefficient and measure method of natural frequency, together with the type of structures, are taken into account in the model. The shaking test results for a model of reinforced concrete high-rise buildings show that the damage detection results based on the proposed model are close to the test results.
Influence of Soft Interlayer in Concrete Sandwich Panel on Propagation Characteristics of Plane Explosive Wave
Authors: Dong Yong Xiang , Feng Shun Shan , Duan Xiang Jie , Xiao Li Xing
Published: June 2011

The propagation characteristics and laws of concrete sandwich with foam soft interlayer under contact explosion were studied by numerical simulation. Based on a reasonable choice of the constitutive model and physical parameters by numerical methods, the plane blast wave propagation features of the concrete structure are illustrated, including the stress wave propagation and attenuation, space-time evolution of damage and wave reflection and transmission at layered interfaces, and the total energy distribution in various medium layers. The structural failure and destruction of two-dimensional dynamic process was reproduced by numerical computation. Meanwhile, it is pointed out that the role of soft interlayer in concrete sandwich structure is mainly by its low wave impedance, the waveform of incident wave is changed and stress wavelength is pull wide, the radial diffusion of energy is enhanced and the amplitude of impulse and energy inputting the third layer is reduced, thus as a result the protective performance of overall concrete sandwich structure is improved.
Topology Optimization of Bracing Systems for Multistory Steel Frames under Earthquake Loads
Authors: Huang Ji Zhuo , Wang Zhan
Published: June 2011

Application of continuum structural topology optimization methods to the layout design of bracing systems for multistory steel frame buildings under earthquake loads is explored in this work. A weighted average strain energy sensitivity of element is formulated to be served as the element removal criterion in the optimization process, and then an ESO-based continuum structural topology optimization method for the layout design of multistory steel frame bracing systems subjected to earthquake-induced ground motions is presented. In each iterative design, an approximate reanalysis technique named CA method is adopted to reduce the computational effort. Finally, a design example is given to demonstrate the effectiveness of the presented optimization method for the optimal layout design of steel frame bracing systems under earthquake loads.
Analysis of Earthquake Resistance & Seismic Isolation Capacity about Mass Concrete Equipment Foundation of Industrial Buildings
Authors: Liu Hui Jun , Li Hui Min , He Jie
Published: June 2011

This paper based on the analysis of typical industrial plants equipment foundation damage caused by 5.12 wenchuan earthquake to conduct preliminary research on earthquake resistance & seismic isolation ability for mass concrete equipment foundation and finally offers several constructive suggestions for rehabilitation and reconstruction.
Typical Seismic Damage Analysis and Repair Reinforcement Methods Study of Reinforced Concrete Industrial Buildings
Authors: Liu Hui Jun , Li Hui Min , He Jie
Published: June 2011

Based on the investigation of damage situations of some reinforced concrete industrial factory buildings in Chengdu affected by Wenchuan Earthquake, and the typical seismic damage analysis of the roof, skylight truss, columns, column bracing and building envelope, this article puts forward several repair and reinforcement measures and methods for reference.
Adoption of Appropriate Construction Technology for Western Rural Areas Based on Cost Compensation Method
Authors: Ma Xin , Li Hui Min , Li Pan Wu , Lu Quip Ping , Zhao Li Ping , Ding Fang
Published: June 2011

With the propose of solving the problem of inappropriate adoption of construction technology while constructing infrastructure in western rural area, technical characters of specific construction technology is measured from three aspects as economic benefit, social benefit and ecological benefit through introducing compensation cost method (CC), thereby the construction technical proposal is found out of which the technical character suits the local technical environment character the best. The conclusions drawn from the study are as follows: High-tech may not be the appropriate technology; The technical characters of appropriate technology must suit the technical environment characters of the applied areas.