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2002 IEEE Wireless communications and Networking Conference, WCNC 2002

作者： Hong, Zhihong Hughes, Brian L. Center for Advanced Computing and Communication Department of Electrical and Computer Engineering North Carolina State University RaleighNC27695-7914 United States

ISBN: (纸本)0780373766

A bit-interleaved space-time coded OFDM system is considered in this paper for frequency-selective fading channels. As OFDM divides a frequency-selective fading channel into a set of parallel flat fading channels, space-time block codes for flat fading are transmitted from each subcarrier by multiple transmit antennas to guarantee space diversity, and code bits are bit-wise interleaved across the subcarriers before being grouped and mapped to space-time block code to obtain frequency diversity. Performance bounds and simulation results show that the bit-interleaved space-time coded OFDM system can effectively exploit both space and frequency diversity to improve performance. © 2002 IEEE.

关键词： Space time codes

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Poster: MPACK 0.7.0: Multiple Precision Version of BLAS and LAPACK

Poster: MPACK 0.7.0: Multiple Precision Version of BLAS and ...

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High Performance computing, Networking, Storage and Analysis (SCC), SC Companion:

作者： Maho Nakata Advanced Center for Computing and Communication RIKEN Wako Saitama Japan

We are interested in the accuracy of linear algebra operations; accuracy of the solution of linear equation, eigenvalue and eigenvectors of some matrices, etc. This is a reason for we have been developing the MPACK. The MPACK consists of MBLAS and MLAPACK, multiple precision version of BLAS and LAPACK, respectively. Features of MPACK are: (i) based on LAPACK 3.x, (ii) to provide a reference implementation and or API (iii) written in C++, rewrite from FORTRAN77 (iv) supports GMP, MPFR, DD/QD and binary128 as multiple precision arithmetic library and (v) portable. Current version of MPACK is 0.7.0 and it supports 76 MBLAS routines and 100 MLAPACK routines. Matrix-matrix multiplication routine has been accelerated using NVIDIA C2050 GPU.

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Multi-class Imbalanced Classification Problems in Network Attack Detections 6th

Multi-class Imbalanced Classification Problems in Network At...

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6th International Conference on Electrical, Control and Computer Engineering, InECCE 2021

作者： Fern, Soon Hui Amir, Amiza Azemi, Saidatul Norlyana Faculty of Electronic Engineering Technology Universiti Malaysia Perlis Perlis02600 Malaysia Advanced Computing Center of Excellence Universiti Malaysia Perlis Perlis02600 Malaysia Advanced Communication Engineering Center of Excellence Universiti Malaysia Perlis Perlis01000 Malaysia

ISBN: (纸本)9789811686894

Nowadays, network anomaly activities can be detected by using machine learning. The performance of the machine learning algorithms depends on the distribution of the dataset. Network anomaly detection is one of the popular topics that contain vast numbers of data and faced imbalanced multiclass classification distribution. However, most researchers have neglected the problem of multiclass imbalanced classification when undergoing their research on network anomaly detection. It cannot be denied that some researchers proposed some methods to solve this problem. Nevertheless, the methods that have been proposed still contains some drawbacks. Hence, in this research, the performance of the machine learning due to the effect of a multiclass imbalanced dataset was studied. Seven machine learning algorithms from different families will be used in this study, and their ability to classify the majority and minority class instances and achieved high classification accuracy will be identified. Besides, seven different performance metrics will also be used to evaluate the performance of the classifiers used in this study. The results show that although the classification accuracy of the Bayesian machine learning algorithms is lower than other classifiers used in this research, they perform well in detecting the minority class instances. Besides, J48 has known as the classifier that can work well in every aspect of this research. © 2022, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Machine learning

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The Importance of Precision in Humour Classification

The Importance of Precision in Humour Classification

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12th International Conference on Intelligent Data Engineering and Automated Learning (IDEAL 2011)

作者： Costa, Joana Silva, Catarina Antunes, Mario Ribeiro, Bernardete Computer Science Communication and Research Centre School of Technology and Management Polytechnic Institute of Leiria Portugal Department of Informatics Engineering Center for Informatics and Systems of the University of Coimbra (CISUC) Portugal Center for Research in Advanced Computing Systems (CRACS) Portugal

ISBN: (纸本)9783642238772

Humour classification is one of the most interesting and difficult tasks in text classification. Humour is subjective by nature, yet humans are able to promptly define their preferences. Nowadays people often search for humour as a relaxing proxy to overcome stressful and demanding situations, having little or no time to search contents for such activities. Hence, we propose to aid the definition of personal models that allow the user to access humour with more confidence on the precision of his preferences. In this paper we focus on a Support Vector Machine (SVM) active learning strategy that uses specific most informative examples to improve baseline performance. Experiments were carried out using the widely available Jester jokes dataset, with encouraging results on the proposed framework.

关键词： Support Vector Machine Active Learning Text Classification Humour classification

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A benchmark test of boson sampling on Tianhe-2 supercomputer

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National Science Review 2018年第5期5卷 715-720页

作者： Junjie Wu Yong Liu Baida Zhang Xianmin Jin Yang Wang Huiquan Wang Xuejun Yang Institute for Quantum Information & State Key Laboratory of High Performance Computing College of ComputerNational University of Defense Technology State Key Laboratory of Advanced Optical Communication Systems and Networks School of Physics and AstronomyShanghai Jiao Tong University Synergetic Innovation Center of Quantum Information and Quantum Physics University of Science and Technology of China

Boson sampling, thought to be intractable classically, can be solved by a quantum machine composed of merely generation, linear evolution and detection of single photons. Such an analog quantum computer for this specific problem provides a shortcut to boost the absolute computing power of quantum computers to beat classical ones. However, the capacity bound of classical computers for simulating boson sampling has not yet been identified. Here we simulate boson sampling on the Tianhe-2 supercomputer, which occupied the first place in the world ranking six times from 2013 to 2016. We computed the permanent of the largest matrix using up to 312 000 CPU cores of Tianhe-2, and inferred from the current most efficient permanent-computing algorithms that an upper bound on the performance of Tianhe-2 is one 50-photon sample per ～100 min. In addition, we found a precision issue with one of two permanent-computing algorithms.

关键词： boson sampling permanent quantum supremacy quantum computing supercomputer

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Adaptive modulation using outdated samples of another fading channel

Adaptive modulation using outdated samples of another fading...

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2002 IEEE Wireless communications and Networking Conference, WCNC 2002

作者： Yang, Tung-Sheng Duel-Hallen, Alexandra North Carolina State University Dept. of Electrical and Computer Engineering Center for Advanced Computing and Communication RaleighNC27695-7914 United States

ISBN: (纸本)0780373766

Adaptive transmission techniques, such as adaptive modulation and coding, adaptive power control, adaptive transmitter antenna diversity, etc., generally require precise channel estimation and channel state information (CSI) feedback. For fast vehicle speeds, reliable adaptive transmission also requires prediction of future CSI since the channel conditions are rapidly time-variant. We propose to use past channel observations of one carrier to predict future CSI and perform adaptive modulation without feedback for another correlated carrier. A statistical model of the prediction error that depends on the frequency and time correlation is developed and is used in the design of reliable adaptive modulation methods. Significant gains relative to non-adaptive techniques are demonstrated for sufficiently correlated channels and realistic prediction range. © 2002 IEEE.

关键词： Channel state information

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All-terminal reliability analysis of the SRP-ring: the effect of enhanced intelligent protection switching

All-terminal reliability analysis of the SRP-ring: the effec...

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International Conference on Computer communications and Networks (ICCCN)

作者： Ming Qian D. Logothetis K.S. Trivedi Center for Advanced Computing and Communication Duke University Durham NC USA

Spatial reuse protocol (SRP) is a media access control (MAC)-layer protocol that operates over a double counter-rotating ring network topology. SRP is designed to enhance the SONET network so that it can handle data traffic more efficiently. We study the all-terminal reliability of an SRP ring implementing intelligent protection switch (IPS) and enhanced intelligent protection switch (E-IPS). We calculate reliability for all scenarios under which all-terminal connectivity is maintained. By summing up the results arising from individual mutually exclusive events, all-terminal reliabilities for IPS and E-IPS are obtained. By further assuming constant and time-dependent component failure rates, mean time to failure (MTTF) and mean time to failure improvement factor (MTIF) measures are calculated. Results show that MTTF/MTIF vary as functions of network size, component reliability and coverage factor. The advantage of E-IPS over IPS is more obvious when network size is big and concentrator failure rate is small. Our analysis could be helpful to network designers who wish to determine whether the additional cost/complexity added by the E-IPS scheme is justified.

关键词： Switches Media Access Protocol SONET Protection switching communication system traffic control Telecommunication network reliability Maintenance Intelligent networks Network topology FDDI

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Using mean field annealing to solve anisotropic diffusion problems

Using mean field annealing to solve anisotropic diffusion pr...

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IEEE International Conference on Image Processing

作者： Hairong Qi W.E. Snyder G.L. Bilbro Center for Advanced Computing and Communication North Carolina State University USA

Anisotropic diffusion is a powerful method for image feature extraction in which blurring is allowed to occur except at edges. Mean field annealing (MFA) is an image optimization technique which is used to find the best estimation of a blurred, noisy corrupted image. We show that MFA is versatile enough to be used for image feature extraction as well. Furthermore, the two major problems in anisotropic diffusion (white noise and geometric interpretation) can be solved by few modifications of the MFA equation. Finally, experiments and results are presented.

关键词： Annealing Anisotropic magnetoresistance Kernel Feature extraction White noise Nonlinear equations Smoothing methods Image restoration Optimization methods Minimization methods

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On impulsive models of multiuser interference 33

On impulsive models of multiuser interference

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33rd Asilomar Conference on Signals, Systems, and Computers, ACSSC 1999

作者： Hughes, B.L. Dept. of Electr. and Comput. Eng. North Carolina State Univ. Center for Advanced Computing and Communication RaleighNC27695-7914 United States

ISBN: (纸本)0780357000

We present a model for the interference generated by a collection of geographically-distributed, bursty transmitters. Transmitters begin transmission at random times and locations, determined by a Poisson process in space and time. As each transmitted signal propagates to the receiver;it is attenuated by a power-law path loss and shifted in phase by a random angle. We show that the combined interference of all transmitters can be represented as an integral with respect to an α-stable random measure. Further;these results can be adapted to include the effects of fading, delay spread, and Doppler. The tools developed here may be useful for modeling other impulsive phenomena, such as automobile ignition noise and radar clutter. © 1999 IEEE.

关键词： Transmitters

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Motivational Factors in Privacy Protection Behaviour Model for Social Networking

Motivational Factors in Privacy Protection Behaviour Model f...

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2017 Malaysian Technical Universities Conference on Engineering and Technology, MUCET 2017

作者： Sedek, Muliati Ahmad, Rabiah Othman, Nur Fadzilah Center for Teaching and Learning Universiti Teknikal Melaka Durian Tunggal Melaka76100 Malaysia Center for Advanced Computing Technology Faculty of Information Technology and Communication Universiti Teknikal Melaka Durian Tunggal Melaka76100 Malaysia

This study aims to investigate the determinants of the privacy protection behaviour strategies that been employed by users while utilising SNSs. By understanding the determinants of privacy protection will be able to generate awareness that can protect users and allow them to confidently impose their self-control through the execution of privacy protection behaviour strategies. The finding has shown that there was a significant relationship of perceived severity, perceived vulnerability, response efficacy and self-efficacy towards information privacy concern as well as a significant relationship of information privacy concern and privacy protection behaviour strategies. This research is crucial as it serves as a guide that provides instructions and guidelines that help users of SNSs to keep their privacy intact. © The Authors, published by EDP Sciences, 2018.

关键词： Social networking (online)

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