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Application of dynamic uncertain causality graph in spacecraft fault diagnosis: Logic cycle

AIP Conference Proceedings 2017年第1期1834卷

作者： Quanying Yao Qin Zhang Peng Liu Ping Yang Ma Zhu Xiaochen Wang 1School of Computer Science and Engineering Beihang University Beijing 100191 China 2Department of Computer Science and Technology Tsinghua University Beijing 100084 China 3Beijing Institute of Spacecraft System Engineering Beijing 10094 China

Intelligent diagnosis system are applied to fault diagnosis in spacecraft. Dynamic Uncertain Causality Graph (DUCG) is a new probability graphic model with many advantages. In the knowledge expression of spacecraft fault diagnosis, feedback among variables is frequently encountered, which may cause directed cyclic graphs (DCGs). Probabilistic graphical models (PGMs) such as bayesian network (BN) have been widely applied in uncertain causality representation and probabilistic reasoning, but BN does not allow DCGs. In this paper, DUGG is applied to fault diagnosis in spacecraft: introducing the inference algorithm for the DUCG to deal with feedback. Now, DUCG has been tested in 16 typical faults with 100% diagnosis accuracy.

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Construction of balance laws of first order quasilinear systems of partial differential equations

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AIP Conference Proceedings 2017年第1期1863卷

作者： Marianna Ruggieri Maria Paola Speciale 1Faculty of Engineering and Architecture Kore University of Enna Enna Italy 2Department of Mathematical and Computer Sciences Physical Sciences and Earth Sciences University of Messina Messina Italy

For an assigned nonautonomous and nonhomogeneous first order quasilinear system of partial differential equations (PDE), our aim is to obtain autonomous or nonautonomous balance laws.

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Determination of balance laws for nonautonomous differential equations of s-order

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AIP Conference Proceedings 2017年第1期1863卷

For an assigned nonautonomous system of partial differential equations (PDE), our aim in this note is to construct the associated Balance Laws (B.L.), following two different approach and finally to make a comparison ...

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Time-scaling non-vibrato musical tones while preserving timbral texture

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Proceedings of Meetings on Acoustics 2017年第1期31卷

作者： An Zhao James W. Beauchamp 1Department of Electrical and Computer Engineering University of Illinois at Urbana-Champaign Urbana Illinois 61801 USA anzhao2@illinois.edu 2Department of Electrical and Computer Engineering & School of Music University of Illinois at Urbana-Champaign Urbana Illinois 61801 USA jwbeauch@illinois.edu

Sounds produced by linear stretching of nonvibrato single tones fail to preserve their original microvariations. While looping is commonly used for elongation with wavetable synthesis, this method requires careful attention to periodic waveform boundaries. Time extension by time reversal ensures continuity in the time domain, but this method causes audible clicks due to waveform phase reversals. This problem is overcome by using a pitch-synchronous phase vocoder method that generates time- varying harmonic amplitude and frequency envelopes. Applying a time-reversal “zig-zag” method to these envelopes and converting to the time domain via sinusoidal additive synthesis generates elongated versions of the original sound without audible clicks. To retain realism, original attack and decay time data are preserved. For shortening, envelopes are cross-faded between the attack-end and decay-begin points. In addition, for sounds having significant rendering of expression via harmonic amplitude changes, smooth amplitude contours are separated from high frequency microvariations, where the former are elongated by linear interpolation and the latter are elongated by the zig-zag method. As an application, the time-scaling algorithm has been implemented in a score-processing music synthesis program.

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Model-based study for evaluating the sensitivity of eddy current GMR probe inspection of multilayer structures

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AIP Conference Proceedings 2017年第1期1806卷

作者： Zhiyi Su Anders Rosell Lalita Udpa Antonello Tamburrino 1Department of Electrical and Computer Engineering Michigan State University East Lansing MI 48824 USA 2Department of Electrical and Information Engineering Università di Cassino e del Lazio Meridionale 03043 Cassino Italy

In eddy current nondestructive testing (EC-NDT) of a multilayer riveted structure, rotating current excitation, generated by orthogonal coils, is advantageous in providing sensitivity to defects of all orientations. The signal of a defect is not only a function of its size but also of the geometrical features in vicinity to the rivet such as edges, adjacent rivets and properties of the layered structure. Numerical models can be used to provide fast and accurate estimates of defect signals. In this paper the sensitivity of the eddy current system with rotating current excitation and GMR sensors is evaluated by considering the effect of rivet permeability, lift-off, thickness of first layer as well as defect orientation related to adjacent rivets and edges on the signal measured. A numerical model capable of simulating these combinations of defect and test geometry parameters at an acceptable computation time is used. A meta-model is developed based on these simulation results and utilized for sensitivity evaluation.

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An acceptance model for smart glasses based tourism augmented reality

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AIP Conference Proceedings 2017年第1期1891卷

作者： Waqas Khalid Obeidy Haslina Arshad Jiung Yao Huang 1Center for Artificial Intelligence Technology Faculty of Information Science and Technology Universiti Kebangsaan Malaysia Malaysia 2Department of Computer Science & Information Engineering National Taipei University Malaysia

Recent mobile technologies have revolutionized the way people experience their environment. Although, there is only limited research on users’ acceptance of AR in the cultural tourism context, previous researchers have explored the opportunities of using augmented reality (AR) in order to enhance user experience. Recent AR research lack works that integrates dimensions which are specific to cultural tourism and smart glass specific context. Hence, this work proposes an AR acceptance model in the context of cultural heritage tourism and smart glasses capable of performing augmented reality. Therefore, in this paper we aim to present an AR acceptance model to understand the AR usage behavior and visiting intention for tourists who use Smart Glass based AR at UNESCO cultural heritage destinations in Malaysia. Furthermore, this paper identifies information quality, technology readiness, visual appeal, and facilitating conditions as external variables and key factors influencing visitors’ beliefs, attitudes and usage intention.

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New wave simulations to the (3+1)-dimensional modified Kdv-Zakharov-Kuznetsov equation

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AIP Conference Proceedings 2017年第1期1863卷

作者： Haci Mehmet Baskonus Dilara Altan Koç Mustafa Gülsu Hasan Bulut 1Department of Computer Engineering Faculty of Engineering Munzur University Tunceli Turkey 2Department of Mathematics Faculty of Science Mugla Sitki Kocman University Mugla Turkey 3Department of Mathematics Faculty of Science Firat University Elazig Turkey

In this study, we apply an effective method which is improved Bernoulli sub-equation function method (IBSEFM) to the (3+1)-dimensional modified KdV-Zakharov-Kuznetsov equation. It gives some new wave simulations such as complex and exponential structures. We check up whether all structures verify the (3+1)-dimensional modified KdV-Zakharov-Kuznetsov model. Then, we plot three and two dimensional surfaces of obtained solutions by using Wolfram Mathematica 9.

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Finite element analysis (FEA) of dental implant fixture for mechanical stability and rapid osseointegration

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AIP Conference Proceedings 2017年第1期1896卷

作者： Shafia Tabassum Ahmar Murtaza Hasan Ali Zia Mohy Uddin Syedah Sadaf Zehra 1Department of Biomedical Engineering Sir Syed University of Engineering and Technology Karachi Pakistan 2Department of Computer Science Hamdard University Karachi Pakistan 3National Centre for Plasma Science and Technology Dublin City University Ireland

For rapid osseointegration of dental implant fixtures, various surface treatments including plasma spraying, hydroxyapatite coating, acid-etching, and surface grooving are used. However undesirable effects such as chemical modifications, loss of mechanical properties, prolonged processing times and post production treatment steps are often associated with these techniques. The osseointegration rate of the dental implants can be promoted by increasing the surface area of the dental implant, thus increasing the bone cells – implant material contact and allow bone tissues to grow rapidly. Additive Manufacturing (AM) techniques can be used to fabricate dental implant fixtures with desirable surface area in a single step manufacturing process. AM allows the use of computer Aided Designing (CAD) for customised rapid prototyping of components with precise control over geometry. In this study, the dental implant fixture that replaces the tooth root was designed on commercially available software COMSOL. Nickel – titanium alloy was selected as build materials for dental implant. The geometry of the dental fixture was varied by changing the interspacing distance (thread pitch) and number of threads to increase the total surface area. Three different microstructures were introduced on the surface of dental implant. The designed models were used to examine the effect of changing geometries on the total surface area. Finite Element Analysis (FEA) was performed to investigate the effect of changing geometries on the mechanical properties of the dental implant fixtures using stress analysis.

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Performance evaluation of firefly algorithm with variation in sorting for non-linear benchmark problems

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AIP Conference Proceedings 2017年第1期1836卷

作者： A. J. Umbarkar U. T. Balande P. D. Seth 1Department of Information Technology Walchand College of Engineering Sangli 416416 MS India 2Department of Information Technology Walchand College of Engineering Sangli 416416 MS India 3Department of Master of Computer Applications Government College of Engineering Karad 415124 MS India

The field of nature inspired computing and optimization techniques have evolved to solve difficult optimization problems in diverse fields of engineering, science and technology. The firefly attraction process is mimicked in the algorithm for solving optimization problems. In Firefly Algorithm (FA) sorting of fireflies is done by using sorting algorithm. The original FA is proposed with bubble sort for ranking the fireflies. In this paper, the quick sort replaces bubble sort to decrease the time complexity of FA. The dataset used is unconstrained benchmark functions from CEC 2005 [22]. The comparison of FA using bubble sort and FA using quick sort is performed with respect to best, worst, mean, standard deviation, number of comparisons and execution time. The experimental result shows that FA using quick sort requires less number of comparisons but requires more execution time. The increased number of fireflies helps to converge into optimal solution whereas by varying dimension for algorithm performed better at a lower dimension than higher dimension.

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A review of lossless audio compression standards and algorithms

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AIP Conference Proceedings 2017年第1期1883卷

作者： Fathiah Abdul Muin Teddy Surya Gunawan Mira Kartiwi Elsheikh M. A. Elsheikh 1Department of Electrical and Computer Engineering Kulliyyah of Engineering International Islamic University Malaysia Jalan Gombak Kuala Lumpur Selangor Malaysia 2Department of Information Systems Kulliyyah of Engineering International Islamic University Malaysia Jalan Gombak 5310 Kuala Lumpur Malaysia

Over the years, lossless audio compression has gained popularity as researchers and businesses has become more aware of the need for better quality and higher storage demand. This paper will analyse various lossless audio coding algorithm and standards that are used and available in the market focusing on Linear Predictive Coding (LPC) specifically due to its popularity and robustness in audio compression, nevertheless other prediction methods are compared to verify this. Advanced representation of LPC such as LSP decomposition techniques are also discussed within this paper.

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