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Symposium on Colossal Data Analysis and Networking (CDAN)

作者： Mehto, Aman Indras, Karnika Medicaps Inst Technol & Management Dept Comp Sci Indore 453331 Madhya Pradesh India

ISBN: (纸本)9781509006694

Keeping in mind the peculiarity about product reviews, we have proposed a method that can help in determining the sentiment associated with the product in any review. Our method is based on `Lexicon based approach for Sentiment Analysis' with an additional feature of Aspect Catalogue. In our approach we first look for the keywords present in aspect catalogue to identify those sentences in which features of any product are mentioned. Taking into account only these sentences we further work on determining what opinion the speaker holds about features or aspects of the product. Aspect catalogue is referred again to find degree of importance corresponding to the feature with respect to the product. This is followed by calculation of numerical value of sentiment involved by taking the average of all the weightage of the features present in the text.

关键词： Aspect Catalogue Aspect Weightage Aspect Polarity Lexicon Product Sentiment Product Event integration algorithm

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Research of optical coherence tomography microscope based on CCD detector

Research of optical coherence tomography microscope based on...

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International Conference on Optical Instruments and Technology - Optical Systems and Optoelectronic Instruments

作者： Zhang, Hua Xu, Zhongbao Zhang, Shuomo Hubei Univ Technol Sch Mech Engn Wuhan 430068 Peoples R China

ISBN: (纸本)9780819474001

The reference wave phase was modulated with a sinusoidal vibrating mirror attached to a Piezoelectric Transducer (PZT), the integration was performed by a CCD, and the charge storage period of the CCD image sensor was one-quarter period of the sinusoidal phase modulation. With the frequency-synchronous detection technique, four images (four frames of interference pattern) were recorded during one period of the phase modulation. In order to obtain the optimum modulation parameter, the values of amplitude and phase of the sinusoidal phase modulation were determined by considering the measurement error caused by the additive noise contained in the detected values. The PZT oscillation was controlled by a closed loop control system based on PID controller. An ideal discrete digital sine function at 50Hz with adjustable amplitude was used to adjust the vibrating of PZT, and a digital phase shift techniques was used to adjust vibrating phase of PZT so that the phase of the modulation could reach their optimum values. The CCD detector was triggered with software at 200Hz. Based on work above, a small coherent signal masked by the preponderant incoherent background with a CCD detector was obtained.

关键词： full-field optical coherence tomography combination light source frequency-synchronous detection technique phase modulation integration algorithm

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New integrator for molecular dynamics simulations

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COMPUTER PHYSICS COMMUNICATIONS 2002年第1-2期147卷 733-736页

作者： Khakimov, ZM Uzbek Acad Sci Inst Nucl Phys Tashkent 702132 Uzbekistan

New third-order algorithms are proposed for integrating Newtonian equations of motion, which are more accurate and efficient than well-known algorithms, including high-order predictor-corrector ones. They enable one to increase noticeable typical time steps (similar to1 fs) in molecular dynamics simulations or to improve energy conservation by two orders of magnitude at high time steps. The algorithms are tested for the exactly solvable harmonic potential well model and for a silicon cluster using a tight-binding method for force calculations. (C) 2002 Elsevier Science B.V. All rights reserved.

关键词： molecular dynamics integration algorithm energy conservation harmonic potential model tight-binding model

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The Research on System Reliability in Complex External Conditions Based on SVM

The Research on System Reliability in Complex External Condi...

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International Conference on Advanced Research on Electronic Commerce, Web Application, and Communication

作者： Wan, Yi Xu, Yue Wenzhou Univ Coll Phys & Elect Informat Engn Wenzhou Peoples R China

ISBN: (纸本)9783642203664

Analysis method based on support vector machine and finite element combined with Monte Carlo is applied for the parts in complex external conditions or surroundings, it is difficult to built reliability model of the parts in complex the external conditions or surroundings and it is difficult to establish stress and intention distribution and joint probability density because they work in an uncertain environment, the support vector machine has a good generalization ability prediction ability, integration algorithm based on support vector machine, finite element and Monte Carlo can solve the questions and can excellently use for reliability simulation and calculation for complex and certain system. It is used for reliability analysis of catenary parts in the high-speed electrified railway. integration algorithm mathematic model of reliability analysis for location hook is built, and the outside parameter influence on wrist-arm of location hook is analyzed by the model.

关键词： integration algorithm support vector machine location hook complex the external conditions or surroundings Reliability analysis catenary

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IV-IDM: Reliable Intrusion Detection Method based on Involution and Voting

IV-IDM: Reliable Intrusion Detection Method based on Involut...

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IEEE International Conference on Communications (ICC)

作者： Han, Xueying Dong, Pu Liu, Song Jiang, Bo Lu, Zhigang Cui, Zelin Chinese Acad Sci Inst Informat Engn Beijing Peoples R China Univ Chinese Acad Sci Sch Cyber Secur Beijing Peoples R China

ISBN: (数字)9781538683477

ISBN: (纸本)9781538683477

Intrusion detection is critical in the area of cyberspace security. Deep learning methods, especially CNN, have been widely used in intrusion detection in recent years. Network traffic is usually converted into images for processing. However, images converted from network traffic do not have multi-channel features like real-world pictures and have explicit long-distance dependencies between pixels. These characteristics will cause weak performance and poor explanation, making images converted from network traffic unsuitable to be processed by CNN. Besides, most works only consider the first few packets (named head packets) in a flow, which contains the information about connection establishment and interaction between two parts. However, the last few packets (named tail packets) are omitted, resulting in the loss of information about disconnection. To handle the above problems, we propose a reliable intrusion detection model called IV-IDM. Instead of convolution, IV-IDM uses a new structure, involution. Involution has the properties of spatial-specific and channel-agnostic and is more suitable for intrusion detection tasks than convolution. We also propose I-Res, which is constructed based on involution and is used as the base classifier of IV-IDM. We use head and tail packets of a flow as the inputs to two I-Res respectively to learn richer information and employ a voting algorithm to integrate the results of these two parts to promote the robustness of the model. Finally, IV-IDM is evaluated by the ISCX-IDS-2012 and the CIC-IDS-2017 datasets. The experimental results demonstrate that IV-IDM outperforms the state-of-the-art models and is qualified for intrusion detection.

关键词： intrusion detection involution convolution integration algorithm deep learning

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New integrator for molecular dynamics simulations

New integrator for molecular dynamics simulations

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Europhysics Conference on Computational Physics (CCP 2001)

作者： Khakimov, ZM Uzbek Acad Sci Inst Nucl Phys Tashkent 702132 Uzbekistan

关键词： molecular dynamics integration algorithm energy conservation harmonic potential model tight-binding model

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NUMERICAL IMPLEMENTATION OF AN ELASTOPLASTIC MODEL FOR UNSATURATED SOILS

NUMERICAL IMPLEMENTATION OF AN ELASTOPLASTIC MODEL FOR UNSAT...

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11th International Conference on Computational Plasticity (COMPLAS) - Fundamentals and Applications

作者： Gonzalez, Nubia A. Gens, Antonio Univ Politecn Cataluna Dept Geotech Engn & Geosci ES-08034 Barcelona Spain

ISBN: (纸本)9788489925731

This paper describes some issues related to the numerical implementation of a constitutive model for unsaturated soils based on the BBM [1]. The focus of the paper is on the stress variables used and on the numerical algorithms adopted. Conventional stress variable approach (net stress and suction) as well as the approach that takes into account the degree of saturation (Bishop's stress and suction) are examined. To solve the constitutive stress-strain equations, two stress integration procedures have been implemented, an explicit stress integration scheme with automatic substepping and error control techniques [2] and a fully implicit stress integration scheme based on the Backward-Euler algorithm with substepping [3]. Their performances during the integration of the constitutive laws are compared.

关键词： Unsaturated soils constitutive model integration algorithm elastoplasticity stress variables

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Ephemeris validation of Rendezvous Guidance in Lunar NRHO

Ephemeris validation of Rendezvous Guidance in Lunar NRHO

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AIAA Science and Technology Forum and Exposition (AIAA SciTech Forum)

作者： Bucchioni, G. Innocenti, M. Univ Pisa Dept Informat Engn I-56128 Pisa Italy

ISBN: (数字)9781624106095

ISBN: (纸本)9781624106095

The paper proposes a comparison between the circular restricted three body problem, the elliptic restricted three body problem and an Ephemeris model for describing rendezvous and berthing manoeuvres in the presence of a non negligible third body influence. The context in which the work was developed is the autonomous rendezvous operations in Cislunar space for ESA's HERACLES mission. The purpose of the mission is to show the progress of autonomous operations in space. In particular, the paper focuses on the final part of this mission: the autonomous rendezvous between a passive vehicle on a NRHO and an active vehicle coming from the Moon surface. The work also analyzes the approaching guidance, designed under elliptic restricted three body problem hypotheses, with the Earth-Moon Ephemeris model implemented in the General Mission Analysis Tool (GMAT) by NASA.

关键词： Ephemeris Near Rectilinear Halo Orbit General Mission Analysis Tool Moon Planets Rendezvous Guidance Inertial Reference System integration algorithm Open Source Software Newton's Second Law

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INS/FMCW Radar Integrated Local Positioning System 8

INS/FMCW Radar Integrated Local Positioning System

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DGON Inertial Sensors and Systems Symposium (ISS)

作者： Al-Qudsi, B. Edwan, E. Joram, N. Ellinger, F. Tech Univ Dresden Chair Circuit Design & Network Theory Helmholtzstr 18 D-01069 Dresden Germany

ISBN: (纸本)9781479946631

The aim of this research paper is to explore the feasibility of integrating an inertial measurement unit (IMU) with a frequency-modulated continuous wave (FMCW)-based local positioning system (LPS) to mitigate the effects of multipath bias in highly reflective indoor scenarios. The LPS uses a time difference of arrival (TDOA) positioning scheme. The IMU consists of accelerometer and gyroscope triads. Using a proper integration algorithm combined with a zero-velocity update (ZUPT) technique, a mitigation of about 40% is achieved in terms of the overall LPS position absolute

关键词： CW radar FM radar accelerometers direction-of-arrival estimation gyroscopes inertial navigation measurement errors 'MU FMCW radar INS LPS position absolute error TDOA positioning scheme ZUPT technique accelerometer frequency modulated continuous wave gyroscope inertial measurement unit integration algorithm local positioning system multipath bias effects mitigation time difference of arrival zero-velocity update Accuracy Base stations Chirp Frequency modulation Mobile communication Radar measurements Gyroscopes accelerometers Time difference of arrival integral algorithm frequency modulated radars Positioning systems frequency-modulated-continuous-wave radar INERTIAL MEASUREMENT UNITS Radar measurement Frequency modulation INERTIAL NAVIGATION Direction of arrival estimation BASE STATION Chirp modulation mobile communication

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On the Relation between the Accelerometer and the Gyroscope Measurements 29

On the Relation between the Accelerometer and the Gyroscope ...

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29th International Conference on Applied Electronics (AE)

作者： Mischie, Septimiu Matiu-Iovan, Liliana Politehn Univ Timisoara Fac Elect Telecommun & Informat Technol Timisoara Romania

ISBN: (纸本)9798350362299;9798350350739

This paper investigates the use of microelectromechanical systems such as gyroscope and accelerometer. One issue regarding these devices is their calibration. If accelerometer calibration does not imply special problems, gyroscope calibration is more difficult. Thus, one of the methods for gyroscope calibration is based on the relation between accelerometer and gyroscope measurements. We present two such relations. The first one uses the fact that the derivative of the accelerometer measurements is equal with the cross product between the accelerometer measurements itself and the angular rate. The second method computes the accelerometer measurements as a product between the rotation matrix and initial value of the accelerometer measurements. The angles used in the rotation matrix are computed using the integration of gyroscope measurements. We present experimental results that demonstrate the two claims. Data measurements are acquired either from a smartphone or a device that contains inertial sensors and is compatible with Bluetooth low energy. Finally, we conclude about the gyroscope calibration.

关键词： accelerometer gyroscope rotation matrix cross product integration algorithm calibration MATLAB

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