bluuebunny/crossref_metadata_2025 huggingface dataset:
Reflection of the Nation Cybersecurity's Evolution
Authors: Zheng An Ka , Song Ping , Han Bing Xia , Zheng Min Jiao
Published: August 2013

Cybersecurity, as stated in the 2010 National Security Strategy of America, threats represent one of the most serious national security, public safety, and economic challenges we face as a nation. This paper examines the cybersecurity situation that the nation faces. Based on this, the vulnerabilities present in information systems and systems supporting critical infrastructure to cyberattacks are discussed. The argument is presented that Chinas internet censorship techniques have improved that nations Cybersecurity, which could affect the outcome of a conflict in cyberspace. The key future features of the Cybersecurity in China are put forth at the end of the treatise. The author believes such analysis can credibly help the establishment of the national Cybersecurity strategy.
An Improved Feature Selection Algorithm Based on Parzen Window and Conditional Mutual Information
Authors: He Deng Chao , Hao Wen Ning , Chen Gang , Jin Da Wei
Published: August 2013

In this paper, an improved feature selection algorithm by conditional mutual information with Parzen window was proposed, which adopted conditional mutual information as an evaluation criterion of feature selection in order to overcome the deficiency of feature redundant and used Parzen window to estimate the probability density functions and calculate the conditional mutual information of continuous variables, in such a way as to achieve feature selection for continuous data.
Application of Using Simulated Annealing to Combine Clustering with Collaborative Filtering for Item Recommendation
Authors: Feng Zhi Ming , Su Yi Dan
Published: August 2013

tem-item collaborative filtering was widely used in item recommender system because of good recommend effects. However when facing a large amount of items, there would be performance reduction, because of building a very large item comparison dataset in order to find the similar item. K-means cluster had a very good effect in classification and a good performance even though the dataset being processed is very large. But the cold start was a problem to k-means and we must do some extra work to use it in item recommendation. By using the simulated annealing theory to combine the two methods to fixed the problems of the two methods mentioned above and take use of their advantages for better recommendation effect and performance. The experimental results show that, using simulated annealing to combine the clustering and collaborative filtering in item recommendation system can get more stable recommendation results of better quality.
Application of Performance Motion Capture Technology in Film and Television Performance Animation
Authors: Zhang Man Yu
Published: August 2013

In todays animation films, virtual character animation is a research field developing rapidly in computer graphics, and motion capture is the most significant component, which has brought about revolutionary change for 3D animation production technology. It makes that animation producers are able to drive animation image models directly with the use of actors performance actions and expressions, which has simplified animation manufacturing operation greatly and enhanced quality for animation production.
Reserch on Intelligent Tutoring System Model Based on Multi-AGENT in Mobile Environment
Authors: Wang Jian Hua , Yu Yan
Published: August 2013

Along with the mobile network techniques become more progressive and perfect, the mobile terminal is as a kind of tool, way and assisting power.Its role and status has become more and more significant in the field of intelligent teaching system development. It combines the traditional intelligent teaching system and mobile learning system and make full use of them, in order to adapt to the intelligent teaching system development needs in mobile environment.It is a hot research direction of the current intelligent teaching system.Based on the analysis of the development history of intelligent teaching system, Multi-AGENT system key technology and mobile environment requirement on intelligent teaching system, this paper puts forward a intelligent teaching system model under four layer structure of the mobile environment based on Multi-AGENT.
Adaptive Semi-Fragile Watermarking Based on Complete Quantization and Image Contents
Authors: Wu Guo , Wei Da Wei , Tang Guang Ming , Yang Jin Feng
Published: August 2013

Complete quantization principle is proposed in this paper, based on which, an adaptive semi-fragile watermarking algorithm based on image contents is proposed. The algorithm uses the low frequency sub-band to construct watermarking related to the content of image, and then uses just noticeable difference of wavelet domain to embed watermarking by means of complete quantitative principle. Experiments show this algorithm can classify malicious and non-malicious manipulations accurately.
Research on a Fuzzy Choice Function in Multi-Objective Fuzzy Decision
Authors: Long Jian Xiong
Published: August 2013

In the multi-objective fuzzy decision-making system, the decision-making problems will be encountered in the multi-objective and multi-evaluation process, so that it does not achieve effective decision-making results. How to solve this multi-objective decision making problems, a fuzzy choice function is proposed, that will be proved an effective method of fuzzy evaluation. The multi-objective decision making problem in the selection and evaluation is effectively solved in a decision-making system by using of the fuzzy choice function.
Study on the Equipment Management System Based on Internet of Things
Authors: Mao Jiang Kun , Xu Yu Feng
Published: August 2013

For the demands of unit equipment management under the new situation, equipment management system model was constructed based on Internet of Things, building programs of equipment information management system was put forward based on the system. Information sensing device are combined with inside LAN, which forms a comprehensive equipment information management network in the program, system software uses SQLserver as a database management tool and structure uses B/S architecture. The system is significant in improving the efficiency and level of equipment management.
Research on the Influence of the Process Parameters upon the Quality of Roller Hemming
Authors: Wang Jian Qiang , Yang Jian , Zhu Lu Sheng , Niu Zhao Long
Published: August 2013

This article researched the influence of TCP-RTP distance on the accuracy of product in robot roller hemming through orthogonal experiments used as guidance to optimize the parameter of TCP-RTP distance in practice. Results reveal that the influence of the TCP-RTP distance of each step on the accuracy of a product is different.
Discussion Enterprise Information Virtualization Solutions for Business Continuity
Authors: Tang Li Li
Published: August 2013

Enterprise business continuity risk is to point to have automatic adjustment and rapid response capability, to ensure continuous operation of the business. Through virtualization solutions business continuity, the user will be at a lower cost for higher business continuity is far beyond the traditional way.
On the Statistical Machine Translation Studies
Authors: Wang Ai Ling
Published: August 2013

Machine translation (MT) is one of the core application of natural language processing and an important branch of artificial intelligence research; statistical methods have already become the mainstream of machine translation. This paper explores the comparative analysis on the translation model of statistical natural language processing based on the large-scale corpus; discusses word-based, phrase-based and syntax-based machine translation methods respectively, summarizes the evaluation factors of machine translation and analyzes evaluation methods of machine translation.
Architecture and Existing Applications for Internet of Things
Authors: Li Xiao Jing , Wang Di
Published: August 2013

The Internet of Things (IoT) implies a symbiotic interaction among the real/physical, the digital/virtual worlds. Internet of Things is an integrated part of Future Internet and could be defined as a dynamic global network infrastructure with self-configuring capabilities based on standard and interoperable communication protocols where physical and virtual things have identities, physical attributes, and virtual personalities and use intelligent interfaces, and are seamlessly integrated into the information network. In order to think of the possible applications for the Internet of Things, we list out the main application domains. The characteristics of each domain and some indicative examples are presented. Some existing Applications of IoT are also discussed in this paper.
Cloud Computing Security of E-Commerce Environment
Authors: Wang Xiao Feng
Published: August 2013

Cloud computing is a hot technology now, is a new business model. The use of cloud computing to businesses in many industries, especially e-commerce has brought new opportunities, However, due to the characteristics of its own cloud computing and the Internet network security flaws, Resulting in e-commerce system security weaknesses. This paper describes the cloud computing and security issues of cloud computing in the e-commerce, through e-commerce security needs analysis, proposed ensuring e-commerce security methods in the cloud.
The Application of Decision Tree Algorithm in Medical Field Based on Cloud Platform
Authors: Liu Zhi Yuan , Peng Jian Xi , Yang Yuan Kai
Published: August 2013

In the medical system, medical record is summarized, analyzed and predicted a patient seizure type and incidence. With the development of information technology, a large amount of data is to be processed. Traditional analysis algorithm could not be effectively processed to obtain the best predictive results as the data increasing. Decision tree algorithm based on cloud platform is used to record, analyze and predict patients medical data in this paper. A large number of experimental results show that distributed decision tree algorithm proposed in this paper is efficient and could complete prediction work in medical system. The algorithm has good expansibility, its very suitable for large-scale and multitude medical data process.
Algorithm of the Workpiece's Contour in Inner Spiral Curved Surface of Spiral Stator Using Circular Blade Disc Cutter
Authors: Liu Xi Min , Wang Shu Qiang
Published: August 2013

For the cutting process of the inner spiral curved surface on the spiral stator which has large pitch, this article puts forward a new technological process using a circular blade disc cutter mill the inner spiral curved surface. By studying the spiral feeding motion trajectory of the cutter and on the basis of the theory of planar envelope curves and the judgment rule of its existence, the transformation method of the graphics, this article deduced the mathematics model based on numerical algorithm of the calculation of the workpieces contour shape. The relationship between the workpieces contour shape and the geometric parameter of the cutter has been revealed. It provides the theoretical basis for the error analysis in the cutting process of the stators contour and the appropriative tooling layout.
Research on Trend Predicting for Gap Adjustment Automatically in Offset Machine
Authors: Gao Zhen Qing , Sun Han Xu
Published: August 2013

Aiming to the advantages of traditional manual mechanical adjustment for gaps between key parts of offset machine, a method for gaps adjusting automatically was proposed and a prototype of adjusting device based on BR622 offset machine was formed. In this research, the principle of adjustment automatically was discussed, the configuration with the ARM controller as core of adjustment automatically system was designed, the control software process was analyzing and a prototype was developed. Finally, a method based on gray model is used to predict the trend of offset machine. The method of automatic adjustment for gap can simplify the operations and has practical significance.
Depth-First QRD-M Detection Algorithm for MIMO Systems
Authors: Liu Li , Wang Jin Kuan , Song Xin , Han Yin Hua , Wang Yu Huan
Published: August 2013

Maximum likelihood (ML) detection algorithm for multiple input multiple output (MIMO) systems provided the best bit error rate (BER) performance with heavy calculating complexity. The use of QR decomposition with M-algorithm (QRD-M) had been proposed to provide near-ML detection performance and lower calculating complexity. However, its complexity still grew exponentially with increasing dimension of the transmitted signal. To reduce the problem, an improved detection scheme was proposed here. After constructing the tree detecting model of MIMO systems, the ML search of one layer was done, the branch metrics were calculated and sorted, which gave an ordered set of the layer, then depth-first search were used to search the left layers with termination methods. The proposed algorithm provides near QRD-M detection performance.
An Improved Signal Detection Technique for OFDM System
Authors: Wang Xiao Hong , Li Feng Ming
Published: August 2013

In this paper a signal detection technique based on pilots which are transmitted for channel estimation in OFDM system is proposed in AWGN channel. We analyse the algorithm based on pilots and derive an improved signal detection technique. The performance is compared in terms of detection probability and ROC curves are given. The simulation results show that the improved detection technique whose computational complexity is not high can increase the precision of the detection probability at low SNR.
Fast Human Detection Using Dynamic Contour and Histograms of Oriented Gradients
Authors: Qu Zhi Yi , Jin Ya Xin , Feng Jie
Published: August 2013

Human detection is a challenging problem, owing to variations in pose, body shape, appearance, clothing, illumination, and background clutter, in addition, the cameras or backgrounds make it even harder. But even so, it has many potential applications including net-meeting, security, human-computer interaction, gaming, and even health-care. Various new approaches have been proposed to solve this problem. We have studied and implemented a method by using dynamic contour [ and Histograms of Oriented Gradients [ to detecting human body fast and accurately in static images.
The Application of Computer Technology in Project Management
Authors: Song Xiao Feng , Cao Yang , Li Xiao Qian
Published: August 2013

It has been more than 60 years from people using computer technology in project management. The hardware and software technology have been developed during these 60 years. The development have promoted the information industry progress, and also changed the project management approach. But now, the traditional project management software cannot satisfy the modern management for their limitation. System integration and network based system will be the tendency that the project management software is developing in future.
Sparse Representation Frontal Facial Recognition Algorithm Based on Eigenface
Authors: Ding Bo Yang , Tang Yuan Yan , Zhang Zhen Chao , Wang Xue Wei , Fang Chi
Published: August 2013

Face recognition continues to be a hot topic in pattern recognition and computer vision recent years. Meantime, sparse representation is a new technique utilizing compressed sensing method applied in pattern recognition research recent years. This paper comparison with PCA and SP for face recognition, makes some improvement on great performance eigenface algorithm, using sparse representation with eigenface space to achieved better result. Finally, the proposed algorithm based on eigenface sparse recognition shows that of better result.
Model Parameters Estimation for Image Motion Compensation
Authors: Zhong Xun Yu , Li Xiao Shan , Zhao Yong Gang
Published: August 2013

Fast and optimal motion estimation method is proposed for electronic image stabilization. First, an approach for macro-block judgment is presented. Before motion vectors calculation, gradient information is analyzed, only useful reference blocks that are indispensable for accurate motion estimation are selected, by which the number of macro-blocks for subsequent calculation is reduced. Second, in the block matching, an improved SSDA is used to reduce computing cost. Finally, the affine transformation model and similarity transformation model of image motion are created and using least squares method for solving the optimal estimation of model parameters. Experimental results show the accuracy and fast computing speed of the proposed method.
An Effective Image Matching Algorithm Based on Rotation Independence
Authors: Huang Xian Ying , Chen Wei Wei
Published: August 2013

Traditional image matching algorithms has poor accuracy in image comparing, such as histogram intersection method. A new image matching algorithm based on the similarity comparison of irregular shape is presented in this paper, which divides the image into a number of irregular regions according to different colors, and extracts the boundary points of the irregular region to compose an irregular shape. The direction and distance is used to comparing the two irregular shapes if the rotation of the image is not considered, otherwise circular list is used to ignore the image rotation. It can be used widely. If two irregular shapes are similar, the two images are considered similar. Experiment proves that this method can effectively improve the image matching accuracy.
A Kind of ECC - KNN Classifier's Vehicle Identification Algorithm
Authors: Lü Lin Tao , Gao Huan , Yang Yu Xiang
Published: August 2013

this article presents an improved classifier vehicle identification algorithm to improve the efficiency of the existing vehicle recognition algorithm. First, using edge orientation histograms to extract image characteristics, then, Error correction coding is applied to the classification of classifier, the multi-class classification problems turned into multiple binary classification problems. A large number of experimental analysis shows that the improved vehicle identification algorithm has good recognition performance and robustness. Therefore, the algorithm which this article used has high theoretical and practical value.
Infrared Moving Multi-Target Tracking Based on Particle Filter and FCM
Authors: Hu Fan Jun , Shi Wen Jun
Published: August 2013

An efficient approach based on particle filter and FCM is presented to realize moving infrared multi-target tracking under Island shore background. Some possible targets can be obtained and saved by processing IR data through denoising by median filter, extracting edge, identifying and eliminating sea-sky line, morphological filtering and etc. Data association and robust multi-target tracking can be realized by the proposed particle filter and FCM algorithm. The proposed approach is validated to track multi-target effectively by using actual infrared image sequences with Island shore background. Experiment results indicate the feasibility and effectiveness of the proposed method.
Shot Boundary Detection Algorithm Based on Multi-Feature Fusion
Authors: Jin Kai , Feng Hong Cai , Feng Qi , Zhang Chi
Published: August 2013

To establish a general and robust shot boundary detection algorithm, according to characteristics of lens conversion and the ideal of multiple video features fusion, a shot boundary detection algorithm is proposed based on YUV histogram, texture feature and edge orientation histogram in the paper. Besides, global and self-adaptive threshold are combined to use so as to control the process of shot boundary detection and enhance the accuracy of threshold selection. The experiment results show that the algorithm can effectively realize video shot boundary detection and strengthen the robustness of the detection.
Fault Diagnosis Expert System Applied on Machinery Industry
Authors: Huang Ji Ming , Chai Min Jie , Zhang Rong Ying
Published: August 2013

This paper introduced the fault diagnosis technology and analyzed the shortcomings of traditional fault diagnosis method. Then simply introduced the intelligence fault diagnosis expert system. At last respectively introduced the design idea of three intelligence fault diagnosis expert systems, they respectively is used in rotating machine, mechanical maintenance and hydraulic system. At the same time the key technologies of each intelligence fault diagnosis expert system was respectively introduced.
Application of Artificial Intelligence in Intelligent Buildings
Authors: Wang Xiang Ning , Lin Qing , Chen Jing
Published: August 2013

This paper introduced concept of artificial intelligence and intelligent building at first. Then analyzed the necessity of using AI in the intelligent buildings. At last introduced some typical application of AI in intelligent building such as delightful interior light-environments control system, air conditioning load calculate system and air conditioning control system and fault diagnosis expert system for building intelligent system.
Research on the Real Time Monitor and Evaluation System of the Crews' Work Pressure
Authors: Cai Chen Yan , Zhang Deng Shu , Bo Xu Shi
Published: August 2013

Draw on the motor vehicle drivers' psychological quality comprehensive evaluation method, Fuzzy Analytic Hierarchy Process, to scientific and rational analyze the current crew working pressure source and build a hierarchy strike indicators weight values by MATLAB software. Based on each weight index value, monitoring and evaluation the working pressure of the crewman and the whole crews, the results of the evaluation has a great significance on assessing the wayward seafarers and the Safe Operation of Ships' ability for ship management companies, maritime services sector.
A Multiple Constrained QoS Routing Algorithm for the Wireless Sensor Networks
Authors: Zhou Ze Shun , Xu Yi , Yan Jun Jie , Nie Zhong Wei , Li La Yuan
Published: August 2013

Routing problem is one of the most important issues to a wireless sensor network (WSN). It is the key problem to find an efficient energy strategy for prolonging network's lifetime because power supply might be impossible. This paper discusses the multicast routing problem of WSN with multiple QoS constraints, which may deal with the delay, bandwidth, hop count and packet reception rat and surplus energy metrics, and finds a minimum resource consumption path while satisfying multiple constraints optimization conditions, and describes a network model for researching the multicast routing problem. It presents a dynamic multicast routing algorithm with multiple QoS constraints (MCQoSRA). The MCQoSRA successfully solves the QoS routing problems when multicast nodes change dynamically in the networks. The MCQoSRA only requires the local state information of the link (or node), but does not require any global network sate to be maintained. In MCQoSRA, a multicast group member can join or leave the multicast session dynamically. The MCQoSRA can effectively decrease the overhead for constructing a multicast tree and the delay of the nodes, and improve the success ratio of seeking links. Simulation results show that the MCQoSRA provides an available means to implement multicast routing, and adapt to all kinds of the topology networks, and have better expansibility.
A Fault Injection System Based on QEMU Simulator and Designed for BIT Software Testing
Authors: Li Yi , Xu Ping , Wan Han
Published: August 2013

An important step in the development of dependable systems is the validation of their fault tolerance properties. Fault injection has been widely used for this purpose. This paper presents a simulator implemented fault injection and monitoring environment based on the QEMU platform, called BitVaSim, which is targeted for the embedded development boards equipped with PowerPC or ARM processor together with Built-In Test software operating environment.BitVaSim takes advantage of simulation and do no harm or irruption to either the real hardware or the software, in addition, all the simulated parts are reachable so that more fault modes are available to achieve.BitVaSim uses abstract key-value pairs to describe the functional fault modes, and then simulates the hardware board as while as realistic faults incurred by hardware into the simulator, in order to monitor the activation of the faults and their impact on the target system especially the BIT system behavior in detail. Fault injection interfaces are configured to implement failure mode matching and fault conditions triggering to inject faults on demand in simulator runtime.Faults injected by BitVaSim can affect any process running on the target system (including the kernel), and it is possible to inject faults in applications for which the source code is not available.Experimental results are presented to demonstrate the accuracy and potential of BitVaSim in the evaluation of the dependability properties of the complex computer systems and the BIT system.
Hydraulic System Modeling and Motion Control of Demotion Robots Working Equipment
Authors: Cen Yu Wan , Jiang Ya Fen , Zhang Han Dong
Published: August 2013

Based on the electro-hydraulic proportional system of a demolition robot working device, a simplified mathematical model was established by analyzing dynamic characteristics of the electro-hydraulic proportional valve, flow equation, the continuity equation and force equilibrium equations, and the fuzzy self-adaptive PID controller was designed to realize position control of working equipment. The simulations reveal that, compared with traditional PID, the fuzzy self-adaptive PID controller has these advantages such as smaller overshoot, good dynamic response and steady state performance.
Ontology Model for Situation Awareness of City Tunnel Traffic
Authors: Li Lin , Wu Wei Guo , Liu Nian
Published: August 2013

Networking of city tunnel monitoring systems is an application instance of Internet of Things. Situation awareness of city tunnel traffic is a method of analyzing the traffic safety of city tunnel. This paper studies the ontology model for monitoring tunnel traffic situation. The model reflects the basic concepts and semantic meanings of an integrated traffic network. The situation of the integrated traffic network can be described in standard formats. The use and management of the integrated traffic network is improved. Therefore this model can improve the effectiveness and efficiency of intelligent transportation service.
The Hybrid HMM for RSS-Based Localization in Wireless Sensor Networks
Authors: Zang Yan Hong , Wang Jin Song , Ling Lin , Lu Pei Zhong
Published: August 2013

We proposea method of RSS-base localization in WSN (Wireless Sensor Network), called Hybrid HMM, to improve the stabilityof node localization basedon RSS(Received Signal Strength).This model utilizesHMM(Hidden Markov Model) to takeinto account the time factor when receiving the RSS sequence, andconverts the action of ranging into an operationof classification.For the received RSS used for localization,our Hybrid HMMwill compare it withthe preset RSS threshold value, and put the result into one of two categories for subsequent processing: If the received value is higher than the threshold value, the distance value will be drawn from the signal propagation model. If lower, the information will be obtained from a trained HMM. Experimental results show that the Hybrid HMM method can greatly improve the localization accuracy.
Study & Manufacture RM of Industrial CT System
Authors: Jiang Zhi Hua , Yang Xiao Dong , Tang Dong Mei , Wang Zhi Ming
Published: August 2013

This paper introduces a method of studied and manufactured reference material for calibrating magnification of computed tomography system. The measurement procedure and certified value method of the reference material were also described. Moreover, uncertainty of measurement was evaluated in this paper, by which a state level of confidence was accompanied. Finally one example of application of the reference material was described. We thought that reference material of CT system will update its function and develop its applied field.
Application Research on Geo-Filament Bolt Reinforced Earthen Site
Authors: Mao Xiao Fei , Dong Zhao , Liu Yu Qian
Published: August 2013

After hundreds years or even a thousand years of vicissitudes, the earthen sites are destroyed seriously. Protecting these cultural relics has great historical significance and practical value. The protections of the earthen sites include two aspects which are chemistry and physics protection at present. Compared with chemic protection, the structure stability is more important. So the stability reinforcement used bolt is researched for many scholar. Combined the reinforced project of Gaochang earthen site in xinjiang province, and directed toward the new type bolt of geo-filament, the article introduced the construction technology of the geo-filament bolt; in addition, the numerical comparative tests in typical soil medium were implemented and compared the bearing capacity of bolt from the different affections, and the working mechanism for bolt pulled-out test was revealed quantitatively by the overall course simulating analysis. According the test results, the surface state affects the anchor force obviously; the length of bolt is feasible from 0.8-2.0m. the geo-filament bolt is proved to be an excellent material which is used in the walls reinforcement of earthen sites, and it has many typical characters which are advanced technology, novelty techniques and construction facility. Because of that, the new research will play an important part in guiding us to protect the earthen sites.
Test Research on the Meso-Fabric Properties of Undisturbed Moraine Soil on the West Side of Yulong Snow Mountain
Authors: Lv Shi Zhan , Wang Ren , Hu Ming Jian , Xing Xiao Yi
Published: August 2013

Meso-fabric of gravel particles is not only a reflection of the unique sedimentary history, but also directly affects the geotechnical properties of moraine soil. However, there are few researches on it so far in geotechnical engineering field, due to the difficulty of obtaining undisturbed moraine soil sample. To change this situation, we succeeded in getting undisturbed moraine soil samples from the west side of the Yulong Snow Mountain with the delicate manual cutting work. We scaned the 6 pieces of moraine soil samples by CT instrument and obtained the real meso-fabric images of internal moraine soil for the first time. After CT images binarization and denoising processing with the help of Matlab, section fabric indexes of stone area ratio, grain orientation and particle shape of moraine soil gravel particles were described with conventional statistical methods. The results show that the differences between vertical sections are little, but the differences between vertical sections and horizontal sections are much more obvious.
The Advanced Destruction of Submarin Sandy Slopes
Authors: Wu Xiao Feng , Li Guang Fan , Wang Xiao Liang
Published: August 2013

Failure and loose powder sand instability, both of which may lead to disastrous results. This is shown in the change of internal stress and the observations of sand stability behavior when on expansion state. Once adopted tradition design method, the slopes will become unstable. The position of unstable line is discussed here and the proposed analysis method is based on the region of the potential instability and the state of stress in the groun.
The Assessment of Risk of the Ground Fissures Based on AHP
Authors: Xu Ming Xia , Li Bin , Xu Yong Long , Yan Fang Fang , Wu Di
Published: August 2013

The model is too much subjective and rougher in the quantification and weight of factors during the current study on the assessment of ground fissure disasters. This paper uses AHP to analyze the nature of the complex ground fissure disaster, many influence factors and internal relations. It also makes the assessment of the ground fissure disaster mathematical, provides an easy decision method, and assesses the risk of the ground fissures in Yuncheng basin by this method.
Analysis of Reliability on Slope Stability Based on Safety Factor
Authors: Lv Da Wei , Shi Bao Guo , Wang Fei , Xu Guan Jun
Published: August 2013

A mechanical model for Sarma method was built based on a sliding of simple non-homogeneous rock slope as the research object. The relationship between the lateral positive pressure on block and the critical acceleration coefficient were gotten according to the rock slope block static equilibrium conditions. Then the critical acceleration coefficient formula was deduced. So that the coefficient of slopes security and stability under the conditions of the earthquake intensity were receieved.By using the functional relation between the slopes security and stability coefficient and the critical acceleration coefficient, a monotonously decreases function relationships between the rock slopes security and stability coefficient and the critical acceleration coefficient drowned by the calculation and analysis was gotten. The results show that, this method does not need iteration when compared with the traditional Sarma method; hence a convergence problem does not exist. It also can simplify the calculation and reduce a large number of calculations, the calculated results can meet the requirements after a number of numerical examples analysis.
Supporting Numerical Simulation of Roadway Surrounding Rock in Deep High Stress Based on Broken-Expand Deformation
Authors: Yu Wei Jian , Qu Yan Si , Deng Dai Qiang
Published: August 2013

According to large deformation and supporting problem ofroadway surrounding rock under deep high stress caused by broken-expanddeformation, supporting numerical simulation and optimization on a roadway werestudied. Two primary support scheme of medium length anchor with self-drillinganchor and short pre-stressed anchor withself-drilling anchor and three secondary support scheme of 5m, 6mand 7m length cable were proposedbased on roadway engineering characteristics; Calculationparameters of support structureparameters and surrounding rock were determined based on broken-expanddeformation mechanism, and scheme were calculated respectively; Deformation, plasticzone and stable state of surrounding rock under different support were analyzedbased on results individually, and optimal support scheme were opted. Theresults showed that roadway used 5.5~6.0manchor cable as secondary support whose stability factor can be achieved 1.28could meet productive requirement.
Analysis of the Earth Surface Subsidence Caused By the Dewatering of Shenyang Subway in China
Authors: Wang Shu Hong , Jiang Lei , Wang Jiang
Published: August 2013

Abstract: During excavation in deep foundation pit, the deformation of soil and earth surface caused by engineering dewatering is an important factor to affect engineering safety. In this paper, according to the data provided by the detailed survey report of route 1 subway in Shenyang, the subsidence laws of the ground and around buildings caused by the dewatering of route 1 subwaywere analyzed by using Coupling System of Flow & Solid in FLAC-3D which is based on poroelasticity theory and consolidation theory, and preliminary results were obtained.
Direct Calculation Formulae for Critical Depth of II Type Horseshoe Tunnel with Flat-Bottom
Authors: Li Feng Ling , Wen Hui
Published: August 2013

Abstract: II type horseshoe with flat–bottom evolved from standard II type horseshoe cross-section. It is composed of a flat-bottom and three arc sections. It is commonly applied in the field of hydroelectric engineering. The critical depth computation equation for II type horseshoe cross-section with flat–bottom tunnel is a transcendental equation and no analytic solution. In this paper, based on the mathematics transformation for the basis equation and the relationship analysis between the dimensionless critical depth and the relative parameters, a direct solution is established for the calculation of critical depth for II type horseshoe cross-section with flat–bottom tunnel according to the fitting principle. This method overcomes the shortage of other iterative trial calculating methods, such as complex calculation step, depend on the special chart and curve, and existed serious error. The formula is simply and the maximum error is less than 0.515% under the general engineering design range (ratio of critical depth and arch radius is located between the 0 - 1.60).
A Dilatancy Constitutive Modelling of Saturated Sands Based on the State Parameter
Authors: Zhao Chun Lei , Zhang Wei Hua , Gao Zhi Hua
Published: August 2013

A bounding-surface model is modified and introduced a state parameterbased on phase transformation state, e.g., when subjected to shear, sand will contract until phase transformation is reached, while, then dilatant until the ultimate where =constants simultaneously. With state parameter the deformation tendency of a sand at any time or any conditions can be judged correctly. As a result the dilatancy depends on the state in a way that yields a zero value at phase transformation state. This dependence allows a realistic modelling of the response of a sand in either loose or dense state, or in the transition from one state to another state. A comparison between model simulations and a sequence of experimental results for drained, monotonic loading conditions shows that the proposed concept and modelling technique work effectively using a unique set of parameters (or parameter dependence) for a given sand.
Risks of TBM Construction and Corresponding Measures
Authors: Chen Kui , Feng Huan Huan
Published: August 2013

To get better understanding of TBM construction risk and avoid it, comprehensive analysis and summary of various factors to TBM construction risk were made in three aspects, such as geological and hydrological conditions, TBM equipment, construction team of TBM. Based on the detailed presentation of hydrological conditions, the corresponding demands of TBM equipment and construction team were put forward. Emphatically from the two aspects of bad geological and countermeasures, design of TBM equipment, corresponding strategies to avoid all kinds of risk were proposed. Using Taiwan Hsuehshan Tunnel as the class project, this paper introduced and analyzed the construction risk and of solutions to it, with the hoping of providing guidance for TBM design, risk analysis and evade of construction and other aspects.
Influences of Vehicle Loads on Braced Excavation in Soft Clay
Authors: Xu Chang Jie , Xu Yuan Lei , Lin Hai Hu , Sun Feng Ming
Published: August 2013

Economic development and urbanization give rise to the excavation complexion, and higher requirements on design work are put forward. The risk of excavation in soft clay area is high and the design shall be comprehensive. While in practice, the dynamic characteristic of vehicle loads is seldom calculated. In this paper, conventional one-side plane method (beam on elastic foundation method) and three-dimensional finite element method were adopted to analyze the effects of vehicle loads on the retaining strutting system of braced excavation. Moreover, the reinforcement scheme of excavation after collapse was given as references for similar situations.
Supporting Technology Research of Concrete Filled Steel Tubular Support in Extremely Soft Rock Mining Area
Authors: Wang Jun , Qu Guang Long , Wang Zheng Ze , Sun De Ke
Published: August 2013

Inner Mongolia's xilingol league area of chagannaoers main inclined shaft is extremely soft rock roadway with the properties of 0.12 ~ 5.12MPa in uniaxial compressive strength of rock, 60.6% in clay mineral content and 82% of clay mineral composition is montmorillonite, and with the feature of argillation and expansion by absorbing water in surrounding rock. The two previous supporting schemes for this roadway were double16a I-beam and 650mm concrete layer as the first scheme, and close U36 steel stents as the repairing scheme, respectively. Both of them were failed to control deformation failure of surrounding rock. In this paper, a new supporting scheme was proposed by testing mechanics parameters and mineral composition of surrounding rock, analyzing hydraulic properties of surrounding rock and deformation failure, and evaluating surrounding rock load. This new scheme consists of high strength pressure-bearing ring supporting technology based on concrete filled steel tubular support and surrounding rock partial pressure-releasing technology. Aiming at deformation of side walls of the main inclined shaft roadway, a test was carried out to study the bending resistance of the support and improve the support. The industrial test showed that the new supporting scheme can effectively control the deformation of the main inclined shaft surrounding rock and realize long-term stability of roadway.
Study on Superposition Impact and Hazard Control of Surrounding Environment in the Process of Complex Foundation Pit Excavation
Authors: Liu Tao , Wang Xiao Wei , Pan Xue Fu
Published: August 2013

In this paper, through theoretical analysis and finite element of numerical calculation method, superimposed influence effect in the process of typical complex foundation pit group excavation was analysis and research. Put forward hazard prevention methods aim at the superposition effect in the process of construction, at the same time, the information construction means monitoring is conducted to be verified. Results show that, the relevant control measures was effectively control the displacement of deep foundation pit and surrounding environment.
Rock Long-Term Strength Parameters Determination of a Salt Cavern Gas Storage
Authors: Ran Li Na , Zhang Hua Bin , Wang Zhi Yin
Published: August 2013

In order to determine the long-term mechanical properties of surrounding rock of salt cavern gas storage, long tri-axial creep test studies on rock salt of the field were carried out. Based on the test data, long-term strength of rock salt was determined, and comparatively analysis was conducted combined with of the instantaneous test. The study results show that: Considering the axial strain, radial strain and volumetric strain to determine the long-term strength of rock salt can ensure reliability of the results. Under the same condition, the less salt content, the value of long-term strength is higher. Tri-axial creep process has a different effect degree between cohesion and internal friction angle; it is more sensitive to cohesion. The strain limit should be considered for the stability analysis of multi-bedded salt cavern gas storage construction and pay more attention about the mechanical properties of the interlayer parts. The study results provide references for researching the surrounding rock long-term mechanical properties of salt cavern gas storage.
Research on the Temporal and Spatial Variation of Shallow Tunnel by Construction Disturbance
Authors: Sui Zhi Li , Wang Xu Peng , Li Zhao Guang , Sun Xin Shuo
Published: August 2013

In order to reduce the negative impact of the environment by shallow tunnel construction, ground movement and deformation must be estimated correctly, through simulating the entire process of the shallow tunnel construction, the methods of monitor numbers analysis and numerical simulation have been used to validate the surrounding rock stress and strain in different situation, then the rules of stress changing and the trend of ground surface movement have been in-depth studied. On the basis, non-linear regression method considered time factor has been used to research the space-time deformation law of ground surface, the work provides a new way of estimating the effect on ground surface about shallow tunnel construction.
Research on the Stability of Surrounding Rock in Shallow Tunnel under Unsymmetrical Pressure Based on RDM
Authors: Li Yuan Hui , Dong Long Bin , Xiang Chun Fu , Xia Zi Feng , Zhao Pan Pan , Liu Dong
Published: August 2013

Reasonable evaluation for weak surrounding rock of shallow tunnel under unsymmetrical pressure is very important for the design and construction of tunnel project. The evolvement rule and space distribution characteristic of surrounding rock under different thickness of side covering soil were gained, which include the stress field and plastic zone by adopting rock mass deterioration model, to reveal the instability and failure mechanisms of surrounding rock. And then through analyzing and calculating the measured data in site, the stress characteristics of surrounding rock and supporting structure were gained. The conclusion can be a reference for the design and construction of Hongshigou Tunnel and other similar engineering projects.
Research on Seismic Response Estimation of Reinforced Concrete Pier under Pulse-Type Near-Fault Ground Motion
Authors: Shen Yan Li , Du Xiu Li , Yang Qing Shan
Published: August 2013

For estimating seismic response of pier-structure under near-fault ground motion, The typical pulse-type near-fault ground motion records were chosen to establish a record base, and three pier models with different natural period were established; The non-elastic response spectral displacement of ground motion was used to estimate the nonlinear response; The yield displacement of the nonlinear oscillator was defined based on the static pushover analysis result, and its influence on response estimation was studied. The study result is important for structural seismic response estimation by using the non-elastic response spectral displacement and the probability-based seismic performance evaluation.
Under the Action of Earthquake Ancient Timber Building Column Small Feet Slip Phenomenon Analysis
Authors: Tan Wen Di , Zhu Li , Yan Te Liang
Published: August 2013

In ancient China timber building earthquake damage records, often about "column small feet slip", scholars in ancient timber buildings for the seismic performance study, also thought that "column small feet slip" is one of the reasons for the ancient building in the earthquake Could be survived. This article through to column small feet slip phenomenon, to lead to column small feet slip condition were analyzed, and "column small feet slip" seismic effect evaluation, is to the ancient timber aseismic performance research achievements added.
Seismic Performance of Steel Beam-Column Joint under Low Cyclic Loading with Multiple Cycles
Authors: Ma Hua , Zhang Xue Wei , Li Zhen Bao , Wang Wen Jing , Zhang Fang Liang , Fu Jing
Published: August 2013

An experiment of three T-shape beam-column steel joints with intensive cover plate was conducted under low cyclic loading with different cycle numbers, to study seismic performance of the joints subjected to long-period ground motions. Effects of cycle number on mechanical performance and length of plastic hinge were analyzed. The results show that as the cycle number increases, capacity of the joint decreases, and plastic hinge of the joint develops longer which appears closer to the cover plate, and the platform of skeleton curve grows longer, and the stiffness attenuates slightly.
Damping Effect of Story Isolation Structure Considering Different Positions of Isolation Layer
Authors: Zheng Guo Chen , Xu Hang Li
Published: August 2013

The multi-mass analysis models of story isolation and general structure are established, major parameters are optimized on story isolation structure, with time-history analysis for isolation layers in different position, the contributions of modes and damping effects of absolute acceleration and story drift about story-isolation structure are analysed. Result indicates that after the parametric optimization, the natural period of story-isolation structure is longer than that of general structure; no matter where the position of isolation layer is, the damping effects are always obviously; the position of isolation layer has direct influence on the damping effect, damping effect gradually reduce when the isolation layer raised, and the contributions of high modes to dynamic responses increase; it's worth noting that infrastructure absolute acceleration magnify to some extent compared with general structure.