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Timed CP-nets based RoQ Attack Modeling and System Defense Analysis

Timed CP-nets based RoQ Attack Modeling and System Defense A...

引用

International conference on Innovative Computing and Communication/asia-pacific conference on Information Technology and Ocean engineering

作者： He, Yanxiang Liu, Tao Zhong, Hai Liu, Jianbo Xiong, Qi Wuhan Univ Comp Sch State Key Lab Software Engn Wuhan 430072 Peoples R China Wuhan Univ Comp Sch Key Lab Aerosp Informat Secur & Trust Comp Wuhan 430072 Peoples R China

ISBN: (纸本)9780769539423

Current computing systems often employ sophisticated adaptation mechanisms that enable them to deal with overload conditions. Reduction of Quality(RoQ) attack, a novel category of attack being proposed recently, which exploits the adaptive behavior exhibited by various adaptation mechanisms, can cause different forms of damages to the victim system. For the widely used of adaptation mechanisms, RoQ attack can be a critical threat to the Internet. To better analyze the characteristics of RoQ attack and find efficient defense method, an attack modeling and system defense analysis method based on Timed Colored Petri nets(TCPN) is proposed in this paper. Most traditional network attack simulation methods although can simulate the network behavior realistically, they are not capable of simulate the complicated behavior of victim systems, hence can not be used to support the victim-side defense design efficiently. Based on the strong capacity in expression of colored petri nets, our method is more suitable for modeling dynamic behavior of complex system. With this approach, TCPN is used to describe the behavior of network normal traffic, RoQ attacker and victim system. According to the simulation analysis, we also propose an automated on-line defense scheme based on Adaptative Resource Investment. Simulation experiments show that this scheme can reduce the impact of RoQ attack on targeted system efficiently.

关键词： RoQ attack timed CPN automated on-line defense System modeling design Simulations

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Applying taxonomic knowledge and semantic collaborative filtering to personalized search: A bayesian belief network based approach

Applying taxonomic knowledge and semantic collaborative filt...

引用

12th International asia pacific Web conference, APWeb 2010

作者： Lee, Jae-Won Kim, Han-Joon Lee, Sang-Goo School of Computer Science and Engineering Seoul National University Seoul 151-742 Korea Republic of School of Electrical and Computer Engineering University of Seoul Seoul 130-743 Korea Republic of

ISBN: (纸本)9780769540122

Keyword-based search exploits the exact match between the index terms of a query and documents. Thus, some documents, although they are relevant to the given query, may not be returned to users unless the documents include the index terms of the query. Some search engines use the authority of documents, which is derived from the links of documents, to help keyword-based search provide more accurate search results. However, unlike the Web documents, if the links between documents do not exist, it is difficult to exploit the authority for ranking documents. In this paper, our goals are to derive the implicit authority of documents that do not have explicit links through semantic collaborative filtering (SCF), and to retrieve documents that are semantically related to the given query. To achieve these goals, we represent users' preferences, queries and documents with their corresponding concepts by extending a Bayesian belief network. It is because the Bayesian belief network provides a clear formalism for mapping the users' preferences, queries and documents to their corresponding concepts. The concepts are extracted from a taxonomic knowledgebase such as the Open Directory Project Web directory. In our experiment, we have shown that the extended Bayesian belief network using taxonomic knowledge outperforms the conventional approaches for personalized search. © 2010 IEEE.

关键词： Bayesian networks

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Calculating Study on Flow Characteristics of Butterfly Vacuum Control Valves

Calculating Study on Flow Characteristics of Butterfly Vacuu...

引用

International conference on Applied Mechanics and Mechanical engineering

作者： Zhang, Shiwei Song, Guangzhe Wang, Zhuo Liu, Jince Zhang, Zhijun Northeastern Univ Sch Mech Engn & Automat Shenyang Peoples R China

ISBN: (纸本)9780878492459

Aiming at the actual demand, the gas flow characteristics of butterfly vacuum control valves are investigated in this paper. Classification and characteristic of vacuum control valves are discussed in detail. The geometric and mathematic models for two kinds of butterfly vacuum control valves, with seal and without seal, are respectively built. The gas flows through the valve at different opening angles are simulated under different pressure by means of the Fluent software. The flow percentage function and adjustment sensitivity are introduced and formulated to describe the flow regulating characteristic of control valves. The flow conductance coefficient and flow loss coefficient are defined and formulated to describe the resistance characteristic of control valves. The dates and curves of some simulating examples are given and discussed.

关键词： CFD Vacuum Control Valve Fluent software Flow Characteristics

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Critical success factors for the transformation process in enterprise system implementation

Critical success factors for the transformation process in e...

引用

14th pacific asia conference on Information Systems, PACIS 2010

作者： Mathrani, Sanjay Viehland, Dennis School of Engineering and Advanced Technology Massey University Auckland New Zealand

Organizations continue to deploy enterprise systems (ESs) to improve information flow, reduce costs, and increase operational efficiencies. Realization of these benefits can be enhanced if more is known about the preceding factors that enable transformation of ES data into successful outcomes. This study identifies the critical success factors (CSFs) that influence the process for transforming ES data into knowledge, which leads to business benefits from ES implementation. A multiple case study approach is used to examine how three hi-tech manufacturing companies in New Zealand have deployed an ES and, specifically, the CSFs that contributed to business benefits. The findings emphasize that benefit realization from an ES implementation is a holistic process that not only includes the essential data and technology factors, but also includes business strategy deployment, people and process management, and skills and competency development.

关键词： Enterprise resource planning

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Study on the Calculation Method of Gas Flow in Vacuum System based on the Fluent software

Study on the Calculation Method of Gas Flow in Vacuum System...

引用

International conference on Applied Mechanics and Mechanical engineering

作者： Zhang, Shiwei Liu, Jince Song, Guangzhe Zhang, Zhijun Northeastern Univ Sch Mech Engn & Automat Shenyang Peoples R China

ISBN: (纸本)9780878492459

In order to improve the calculation method of the vacuum system design, the research focus on the way applying the Fluent software to calculation of gas flow in vacuum system in this paper. It is proved that the permission pressure lower limit is 1Pa for meeting the continuity hypothesis. The applicable flow patterns include turbulent flow, laminar flow and transitional flow between turbulent and laminar flow, which are totally defined as the viscous flow in the traditional vacuum field. By means of user define function (UDF), a layer mesh cell of negative quality source is defined to simulate the constant volume flow rate at the inlet of positive displacement vacuum pump, which makes up for the lack of compressible fluid velocity outlet boundary conditions in Fluent. The usability of Fluent in vacuum system is confirmed by a successful calculating example of gas flow in an ice condenser of vacuum freeze dryer.

关键词： CFD Vacuum System Fluent software Pressure Range Velocity Outlet Boundary

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Evaluation of building energy efficiency based on unascertained measure method

Evaluation of building energy efficiency based on unascertai...

引用

2010 International conference on Optics, Photonics and Energy engineering, OPEE 2010

作者： Yao, Jian Faculty of Architectural Civil Engineering and Environment Ningbo University Ningbo China

ISBN: (纸本)9781424452354

Using unascertained measure method, this paper established evaluation model of building energy efficiency based on seven influencing indexes, including the U-value of external wall, the index of thermal inertia of external wall, the U-value of roof, the index of thermal inertia of roof, the value of window, the shading coefficient of window and the visible transmittance of window. Application study of this method was carried out. The results show that the evaluations based on this method are in good agreement with the building energy simulation software's outputs. As a conclusion, this paper provides a new and effective method for the evaluation of building energy efficiency, and it can avoid arbitrary in the past purely subjective and emotional evaluation. © 2010 IEEE.

关键词： Roofs

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The Object Removal Detection Based on the Background Subtraction

The Object Removal Detection Based on the Background Subtrac...

引用

International conference on Applied Mechanics and Mechanical engineering

作者： Chen Linkai Zhu Lihua Jiangsu Teachers Univ Technol Sch Comp Engn Changzhou 213001 Peoples R China Changzhou Coll Informat Technol Software Inst Changzhou 213001 Peoples R China

ISBN: (纸本)9780878492459

Aiming at the preservation of costly objects in the video monitoring, this passage proposed a judgmental method based on the background subtraction of fixed foreground object. This algorithm checks foreground pixel area in the picture using background subtraction and check out the moving action based on the stability of target position and Invariance of Consecutive Frames Subtraction. This method is not complex in calculation. It is also fast and useful that it can meet the request of system immediacy.

关键词： Background Modeling image segmentation background subtraction

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Circular Polarization Fractal Koch microstrip patch antenna using single-fed EM coupled ring Resonators

Circular Polarization Fractal Koch microstrip patch antenna ...

引用

2010 IEEE asia-pacific conference on Applied Electromagnetics, APACE 2010

作者： Yusop, M.A.M. Rahim, M.K.A. Ismail, M.F. Wahid, A. Faculty of Electrical Engineering Universiti Teknologi Malaysia Skudai Johor Malaysia

ISBN: (纸本)9781424485666

This paper describes the design and analysis of a Circular Polarization Fractal Koch Antenna using single-fed electromagnetic (EM) coupled ring resonator at 2.4 GHz. By applying fractal Koch, the proposed antenna size is reduced about 5% compared to the square patch using single-fed EM coupled ring resonator antenna. The simulation process has been done by CST software. Simulation as well as measurement results with antenna design have been presented and it shows that a good agreement in term of return loss and axial ratio. The antenna exhibits a bandwidth of 1.65% at -10dB return loss and 3dB Axial Ratio (AR) bandwidth of 0.78% with gain of 5.97dBi © 2010 IEEE.

关键词： Circular polarization

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FPGA based embedded implement of space vector pulse width modulation

FPGA based embedded implement of space vector pulse width mo...

引用

2nd asia pacific conference on Postgraduate Research in Microelectronics and Electronics, Primeasia 2010

作者： Zhu, Hongshun Dai, Peng Fu, Xiao Zong, Weilin School of Information and Electrical Engineering China Univ. of Minging and Tech. Xuzhou China

ISBN: (纸本)9781424467372

This paper introduces the working principle of space vector pulse width modulation (SVPWM), and presents a new circuit realization of SVPWM generator based on FPGA-embedded technique. MicroBlaze is a 32-bit high-performance processor embedding in the FPGA chip, and the left logical units can be used to design IP cores that needed, thus software and hardware can be combined to realize this SVPWM control system. The proposed SVPWM control scheme can be realized using a single FPGA chip. This scheme contains the advantages of SVPWM generator and FPGA-embedded technique, thus being important for high performance control system, and a new way for the design of high-performance motion control systems is provided.

关键词： Field programmable gate arrays (FPGA)

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RETRACTED ARTICLE: Research on dynamic characteristics of stator core of large turbo-generator

RETRACTED ARTICLE: Research on dynamic characteristics of st...

引用

asia-pacific Power and Energy engineering conference, APPEEC 2010

作者： Wang, Yixuan Wang, Ying Department of Mechanical Engineering Xi'an Polytechnic University Xi'an 710048 Shaanxi China School of Computing National University of Singapore Singapore 117590 Singapore

ISBN: (纸本)9781424448135

The stator core of large turbo-generator experience a number of steady state alternating or transient electro-magnetic forces and unbalance forces in rotating rotor system, and may occur violent vibration which could damage the insulating layer and cause accident. Techniques for vibration reduction require knowledge of the modal frequencies , which depend on the mechanical shapes and dimensions, manufacturing and assembly of stator core as well as material properties, the electromagnetic design, ventilation and cooling design, and the calculation of modal frequencies do also, for example, magnetic permeability, electrical conductivity , thermal conductivity , Young's modulus, Poisson's ratio, mass density, etc. It is found that the generally accepted value of material properties is not valid for stator core with laminations of a large turbo-generator. This paper summarizes simply each method of determinating electro-magnetic constant and elastic properties of stator core material ,and then introduces a simple and effective method for the calculation of the modal frequencies of stator core, which Young's modulus, Poisson's ratio, and mass density are changed in the possible range ; it is then used in ANSYS workbench 12.0 program to determine the resonant frequencies curves of stator core vibration or response surfaces of natural frequencies vs. elastic constants ,and cumulative distribution function (CDF) of the resonant frequencies of stator core by statistical method (Six Sigma Analysis). ©2010 IEEE.

关键词： Turbogenerators

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