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检索条件"任意字段=2012 2nd International Conference on Computer Application and System Modeling, ICCASM 2012"

共 812 条记录，以下是571-580 订阅

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application of Taguchi optimization method in active vibration control of a smart beam

Application of Taguchi optimization method in active vibrati...

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2012 2nd international conference on Key Engineering Materials, ICKEM 2012

作者： Akbarzadeh, Alireza Fallah, Mohsen Mahpeykar, Navid Nabavi, Nader Faculty of Mechanical Engineering Ferdowsi University of Mashhad Mashhad Iran

ISBN: (纸本)9783037853825

Cantilevered beams can serve as a basic model for a number of structures used in various fields of industry, such as airplane wings, turbine blades and robotic manipulator arms. In this paper, the active vibration control of a smart cantilevered beam with a piezoelectric patch is studied. Additionally, the optimization of influential parameters of piezoelectric actuator for the purpose of vibration suppression is performed. Initially, the finite element modeling of the cantilevered beam and its piezoelectric patch is described and the implementation of a control system for vibration suppression is introduced. Transient response of the system under impact loading, with and without controller, is simulated using ANSYS. Taguchi's design of experiments method is used to investigate the effect of five geometric parameters on the vibrational behavior of the system. It is shown that, optimal selection of levels for geometry of the piezoelectric actuator and sensor, can dramatically improve the dynamic response of the smart beam. © (2012) Trans Tech Publications.

关键词： Design of experiments

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Design and realization of Performance Testing system for new developed Hydraulic pumps and Valves

Design and realization of Performance Testing System for new...

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2nd international conference on Advanced Design and Manufacturing Engineering (ADME 2012)

作者： Wang Chenglong Zeng Qingliang Zhang Xin Liu Zhihai Shandong Univ Sci & Technol Coll Mech & Elect Engn Qingdao 266510 Shandong Peoples R China

ISBN: (纸本)9783037855034

In order to ensure the performance of new products, a performance testing system including the design principle, design of hydraulic system and establishment of the computer data acquisition and processing system is given, which can be used to simulate the actual working conditions of a variety of hydraulic components and also used for the loading test. According to application, it shows that the performance testing system can work as an effective approach for quality checking for the new produced hydraulic components before they were put into the market.

关键词： Hydraulic pumps and Valves Performance Testing system Test-bench

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Precision predicting and computer aided adaptive assembly

Precision predicting and computer aided adaptive assembly

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2nd international conference on Advances in Materials and Manufacturing Processes (ICAMMP 2011)

作者： Liu Weidong Liu Jianhua Jiang Ke Wang Jie Beijing Inst Technol Sch Mech Engn Beijing 100081 Peoples R China

ISBN: (纸本)9783037853252

Precision predicting is a new methodology for precision verification and validation of product. Considering the dimension and geometric deviation of assembled part, the precision predicting model is built by assembly deviation sources explaining and deviation propagation route modeling. The deviation source during assembly process is mainly explained by dimension torsor and deviation torsor that are built in common coordinate system, and the deviation propagation rout is modeled by weighted deviation graph. The weighted deviation graph contains vertexes that refer to functional geometry and mating geometry and edges that refer to dimension and geometric constraint;besides, the edge weight is calculated by tolerance evaluation along specific functional direction. In addition, the process of computer aided adaptive assembly method is introduced, and the proper index for assembly precision and accuracy is discussed.

关键词： precision predicting deviation source deviation propagation assembly precision computer aided adaptive assembly

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Vector perceptron learning algorithm using linear programming

Vector perceptron learning algorithm using linear programmin...

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22nd international conference on Artificial Neural Networks, ICANN 2012

作者： Kryzhanovskiy, Vladimir Zhelavskaya, Irina Fonarev, Anatoliy Scientific Research Institute for System Analysis Russian Academy of Sciences Vavilova st. 44/2 Moscow 119333 Russia CUNY City University of New York Department of Engineering and Science 2800 Victory Blvd. SI NY 10314 United States

ISBN: (纸本)9783642332654

application of Linear Programming for binary perceptron learning allows reaching theoretical maximum loading of the perceptron that had been predicted by E. Gardner. In the present paper the idea of learning using Linear Programming is extended to vector multistate neural networks. computer modeling shows that the probability of false identification for the proposed learning rule decreases by up to 50 times compared to the Hebb one. © 2012 Springer-Verlag.

关键词： Linear programming

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Performance Analysis of Space-time and Amplify-and-Forward Cooperative system

Performance Analysis of Space-time and Amplify-and-Forward C...

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2nd international conference on Information Science, Automation and Material system (ISAM 2012)

作者： Zhu, Kaiyan Wang, Hongyu Qian, Daxing Dalian Univ Technol Dalian Peoples R China

ISBN: (纸本)9783037853740

In this paper, we consider a space-time and amplify-and-forward(ST-AF) cooperative system which consists of two-antenna source, single-antenna relay and destination. Source transmits Alamouti space-time coding symbols to destination with cooperation of relay which adopts AF strategy. Closed-form symbol error rate(SER) is derived for the ST-AF system with PSK signals. Moreover, an SER approximation are developed to show the asymptotic performance of the ST-AF cooperative system in medium and high SNR regimes. For comparison, the SER approximation of another cooperative space-time coding(C-STC) scheme is also derived. Theoretical analysis shows that the ST-AF can obtain more diversity gain and achieve higher diversity order than C-STC. Finally, computer simulations validate the theoretical analysis.

关键词： cooperative diversity amplify-and-forward symbol error rate space-time coding

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2nd international conference on Network Computing and Information Security, NCIS 2012

2nd International Conference on Network Computing and Inform...

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2nd international conference on Network Computing and Information Security, NCIS 2012

ISBN: (纸本)9783642352102

The proceedings contain 104 papers. The special focus in this conference is on Network Computing and Information Security. The topics include: on the isomorphism classes of elliptic curves with 2-torsion points;template-based and second-order differential power analysis attacks on masking;design and implementation of Linux file mandatory access control;design and application of fine-grained access control model;intel SYSRET privilege escalation vulnerability analysis;analysis of cloud security and a reliable transmission based on UDP;a survey of passive image forensics;a novel fast ?-adapt slide window elliptic curve cryptography algorithm;application of neural network and cluster analysis in anomaly detection;clustering system call arguments for remote attestation;document selective protection based on third service framework;fine-grain trusted storage and transitivity policy for open network environment;a deep understanding of cloud computing security;study of layers construct for data mining platform based on cloud computing;cloud task and virtual machine allocation strategy in cloud computing environment;GIS application model based on cloud computing;development framework for cloud services;research on distributed file system with hadoop;optimization of green passive optical networks with minimum cost;primary educational resources classification study based on gagne learning classification theory;a special subject database in CALIS project;the design and implementation of automatic drug matching system;asymmetric encryption scheme based on fingerprint topological transformation;a kind of digital signature system based on linear computing;cryptanalysis and improvement of an efficient certificateless signature scheme;robust software watermarking scheme using RC4 and HASH;a novel digital watermarking method based on lifting wavelet transform;a new practical template attack of AES;multi-granule association rule mining based on quantitative concept lattice;brushless

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An Error Correcting 3D Scanning Technique Using Dual Pseudorandom Arrays

An Error Correcting 3D Scanning Technique Using Dual Pseudor...

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2nd Joint 3DIM/3DPVT international conference on 3D Imaging, modeling, Processing, Visualization and Transmission (3DIMPVT)

作者： Wijenayake, Udaya Baek, Seung-Hae Park, Soon-Yong Kyungpook Natl Univ Sch Comp Sci & Engn Taegu South Korea

ISBN: (纸本)9780769548739

Designing a low cost structured light system which can acquire 3D data in real time with great accuracy is still an ongoing topic among computer vision community as it is hard to achieve all these features together. Among various structured light systems, pseudorandom array is the most suitable technique for real time 3D reconstruction as it tends to concentrate the entire coding scheme in a single pattern. But it has the difficulty of decoding the pattern when it loses few pattern symbols. In this paper, we address this problem by introducing an error correcting 3D scanning technique. This technique consists of a two way decoding method which can decode a dual pseudorandom array and a hole-filling algorithm. In the experimental results, we show that our 3D scanning technique largely improves the reconstruction compared to the conventional methods.

关键词： scanning method Pseudorandom error correction images computer vision Optical systems DECODING structured light arrays

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The research of LDPC code in communication system

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2012 2nd international conference on Materials Science and Information Technology, MSIT 2012

作者： Hu, Dan Guizhou University Institute of Computer Science and Information Guiyang China

ISBN: (纸本)9783037854389

Low-Density Parity-Check(LDPC) codes are a class of channel codes based on matrix encoding and iterative decoding. It has low decoding complexity as well as capacity approaching performance. Until now, the best designed LDPC codes can achieve the performance within only 0.0045dB of the Shannon limit. With the in-depth study, the encoding complexity of LDPC codes is not a difficult problem for application any more. Today, we can see LDPC codes widely used in many practical systems, such as wireless communication system, deep-space communication system, optical-fiber communication system and media storage system. This thesis first introduces the development of channel coding, and then the basic principles and concepts of LDPC codes. The following parts discuss several techniques of LDPC codes, including the construction methods of low-density parity matrix, the iterative decoding algorithms and performance analysis methods. Besides, we propose our opinions and our improved algorithms. © (2012) Trans Tech Publications, Switzerland.

关键词： Iterative decoding

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Fault Diagnosis for AP1000 Plant Feed Water system Based on the Fault Petri Net

Fault Diagnosis for AP1000 Plant Feed Water System Based on ...

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2nd international conference on Advanced Design and Manufacturing Engineering (ADME 2012)

作者： Liu, Wei Hu, Rongyuan Yang, Xiyun Dong, Mujie State Nucl Elect Power Planning Design & Res Inst Beijing 100080 Peoples R China

ISBN: (纸本)9783037855027

The feed water system is one of the most important system for nuclear power plant. Based on an analysis for the working principles of the AP1000 plant main feed water system, a novel fault Petri net model and fault diagnosis method are proposed. The main feed water flow low alarm is a serious fault for the feed water system, Petri net theory is adopted to establish the fault model for this fault signal. Through the consequence and account for this model, fault reasons and reasons probability for the main feed water flow low have been obtained. application shows that, the fault Petri net has more advantages than the fault tree in qualitative analysis and quantitative calculation. And this method is a new route for the nuclear plant systems' fault diagnosis.

关键词： AP1000 feed water system fault Petri net modeling fault diagnosis

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Conceptualizing an adaptive framework for pervasive computing environment

Conceptualizing an adaptive framework for pervasive computin...

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2nd international conference on computer Science, Engineering and applications, ICCSEA 2012

作者： Mohan, Akhil Upadhyay, Nitin Computer Science and Information Systems Group BITS-Pilani Goa Campus NH-17 B Zuari Nagar Goa Goa-403726 India

ISBN: (纸本)9783642301100

Pervasive computing is the next thrust area for the researchers, service providers and end users alike but the challenges associated for them are equally grilling. Ad-hoc availability of resources makes it extremely important for the stake-holders to keep their Software Architecture as flexible as possible in order to maintain the Quality of Service. This work provides a solution to the dynamic environment, posed by pervasive computing by suggesting a metadata driven adaptive framework, which can be modeled into existing Architecture Description Languages (ADLs) as well as directly implemented on existing platforms. This work reflects a conceptual framework, as an extension to existing work in this field of adaptive software architectures that can be further customized into more sophisticated system as per the requirements of a pervasive environment or any other similar application area. © 2012 Springer-Verlag GmbH.

关键词： Ubiquitous computing

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