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1st IEEE International Conference on Data engineering, COMPDEC 1984

作者： Ferrari, Domenico Lee, Tzong-Yu Paul Computer Science Division Department of Electrical Engineering and Computer Sciences University of California at Berkeley United States

ISBN: (纸本)081860655X

This paper presents a modeling methodology for the design of file system organizations in a local area network environment. We first propose a characterization for the workload of typical business transaction systems, and then use this measurable characterization to derive input parameters for the file distribution graph models and the queuing network models that represent two completely different file system organizations, i.e., a file server-based file system and a distributed file system. Total system throughput and mean system response time are the indices used in comparing these two design approaches. An example of this comparison is given. It is shown that this methodology and these models are useful tools for the evaluation of certain design tradeoffs. © 1984 IEEE.

关键词： File organization

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Role of exchange interaction in nitrogen vacancy center based magnetometry

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physical Review B 2016年第24期94卷 245424-245424页

作者： Cong Son Ho Seng Ghee Tan Mansoor B. A. Jalil Zilong Chen Leonid A. Krivitsky Department of Electrical and Computer Engineering National University of Singapore 4 Engineering Drive 3 Singapore 117576 Data Storage Institute Agency for Science Technology and Research (A*STAR) 2 Fusionopolis Way 08-01 Innovis Singapore 138634 Division of Physics and Applied Physics School of Physical and Mathematical Sciences Nanyang Technological University Singapore 637371

We propose a multilayer device comprising a thin-film-based ferromagnetic heterostructure (FMH) deposited on a diamond layer doped with nitrogen vacancy centers (NVC's). We find that when the NVC's are in close proximity (1–2 nm) to the FMH, the exchange energy is comparable to, and may even surpass, the magnetostatic interaction energy. This calls forth the need to consider and utilize both effects in magnetometry based on NVC's in diamond. As the distance between the FMH and NVC is decreased to the subnanometer scale, the exponential increase in the exchange energy suggests spintronic applications of NVC's beyond magnetometry, such as detection of spin Hall effect or spin currents.

关键词： Exchange interaction Magnetic systems Nitrogen vacancy centers in diamond

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Byzantine fault tolerance for collaborative editing with commutative operations

Byzantine fault tolerance for collaborative editing with com...

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2016 IEEE International Conference on Electro Information Technology, EIT 2016

作者： Zhao, Wenbing Babi, Mamdouh William, Yang Luo, Xiong Zhu, Yueqin Jack, Yang Chaomin, Luo Yang, Mary Department of Electrical Engineering and Computer Science Cleveland State University ClevelandOH44115 United States Texas Advanced Computing Center University of Texas at Austin 10100 Burnet Road AustinTX78758 United States School of Computer and Communication Engineering University of Science and Technology Beijing Beijing100083 China Development Research Center of China Geological Survey Ministry of Land and Resources Beijing100037 China Division of Biostatistics and Biomathematics Massachusetts General Hospital and Harvard Medical School BostonMA United States Department of Electrical and Computer Engineering University of Detroit Mercy DetroitMI48221 United States Department of Information Science George Washington Donaghey College of Engineering and Information Technology Joint Bioinformatics Program of University of Arkansas at Little Rock University of Arkansas for Medical Sciences 2801 S. University Avenue Little RockAR72204 United States

ISBN: (纸本)9781467399852

In this paper, we present a study on how to achieve Byzantine fault tolerance for collaborative editing systems with commutative operations. Recent research suggests that Conflict-free Replicated Data Types (CRDTs) can be used to construct collaborative editing systems where concurrent update operations are commutative. This new approach is shown to avoid the complex issue of conflict resolution for concurrent updates to a shared document. The shared document is often modeled as a linear text buffer where each basic element is assigned a globally unique and totally ordered identifier. The linear text buffer constructed this way would constitute as a CRDT, which would make concurrent update operations issued by different users commutative. State convergence at all users can be achieved automatically as long as the users could receive the same set of operations irrespective of their relative ordering. However, it is not straightforward to guarantee state convergence in the presence of malicious users and external adversaries. In this paper, we carefully analyze the threats towards this type of systems, and propose a lightweight solution to achieve Byzantine fault tolerance with low runtime overhead. We define a set of correctness properties for such systems and prove that the proposed Byzantine fault tolerance mechanisms guarantee these properties. © 2016 IEEE.

关键词： Fault tolerance

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Photoacoustic signal enhancements from gold nano-colloidal suspensions excited by a pair of time-delayed femtosecond pulses

arXiv

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arXiv 2017年

作者： Masim, Frances Camille P. Hsu, Wei-Hung Liu, Hao-Li Yonezawa, Tetsu Balčytis, Armandas Juodkazis, Saulius Hatanaka, Koji Research Center for Applied Sciences Academia Sinica 128 Sec. 2 Academia Rd. Nankang Taipei115 Taiwan Department of Electrical Engineering Chang Gung University 259 Wenhua 1st Rd. Guishan Dist. Taoyuan333 Taiwan Division of Materials Science and Engineering Faculty of Engineering Hokkaido University Kita 13 Nishi 8 Kita-ku Sapporo0608628 Japan Nanotechnology Facility Center for Micro-Photonics Swinburne University of Technology HawthornVIC3122 Australia Center for Physical Sciences and Technology Savanoriu¸ Ave. 231 VilniusLT-02300 Lithuania Melbourne Centre for Nanofabrication Victorian Node of the Australian National Fabrication Facility 151 Wellington Rd. ClaytonVic3168 Australia

Photoacoustic signal enhancements were observed with a pair of time-delayed femtosecond pulses upon excitation of gold nanosphere colloidal suspension. A systematic experimental investigation of photoacoustic intensity within the delay time, ∆t = 0 to 15 ns, was carried out. The results revealed a significant enhancement factor of ∼ 2 when the pre-pulse energy is 20-30% of the total energy. Pre-pulse and main pulse energy ratios, Ep(1):Es(2), were varied to determine the optimal ratio that yields to maximum photoacoustic signal enhancement. This enhancement was ascribed to the initial stage of thermalization and bubble generation in the nanosecond time scale. Pre-pulse scattering intensity measurements and numerical finite-difference time-domain calculations were performed to reveal dynamics and light field enchancement, respectively. Copyright © 2017, The Authors. All rights reserved.

关键词： Electromagnetic pulse

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Driving fatigue prediction with pre-event electroencephalography (EEG) via a recurrent fuzzy neural network

Driving fatigue prediction with pre-event electroencephalogr...

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IEEE International Conference on Fuzzy Systems (FUZZ-IEEE)

作者： Yu-Ting Liu Shang-Lin Wu Kuang-Pen Chou Yang-Yin Lin Jie Lu Guangquan Zhang Wen-Chieh Lin Chin-Teng Lin Brain Research Center Institute of Electrical Control Engineering Institute of Computer Science and Engineering Electronic Systems Research Division National Chung-Shan Institute of Science and Technology (NCSIST) Taoyuan Taiwan FacuIty of Engineering and Information Technology University of Technology Sydney Sydney Australia Department of Computer Science National Chiao-Tung University Hsinchu Taiwan

ISBN: (纸本)9781509006274

We propose an electroencephalography (EEG) prediction system based on a recurrent fuzzy neural network (RFNN) architecture to assess drivers' fatigue degrees during a virtual-reality (VR) dynamic driving environment. Prediction of fatigue degrees is a crucial and arduous biomedical issue for driving safety, which has attracted growing attention of the research community in the recent past. Meanwhile, combined with the benefits of measuring EEG signals facilitates, many EEG-based brain-computer interfaces (BCIs) have been developed for use in real-time mental assessment. In the literature, EEG signals are severely blended with stochastic noise; therefore, the performance of BCIs is constrained by low resolution in recognition tasks. For this rationale, independent component analysis (ICA) is usually used to find a source mapping from original data that has been blended with unrelated artificial noise. However, the mechanism of ICA cannot be used in real-time BCI design. To overcome this bottleneck, the proposed system in this paper utilizes a recurrent self-evolving fuzzy neural work (RSEFNN) to increase memory capability for adaptive noise cancellation when assessing drivers' mental states during a car driving task. The experimental results without the use of ICA procedure indicate that the proposed RSEFNN model remains superior performance compared with the state-of-the-arts models.

关键词： Electroencephalography Fatigue Real-time systems Vehicles Fuzzy neural networks Signal processing algorithms Integrated circuits

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A motor imagery based brain-computer interface system via swarm-optimized fuzzy integral and its application

A motor imagery based brain-computer interface system via sw...

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IEEE International Conference on Fuzzy Systems (FUZZ-IEEE)

作者： Shang-Lin Wu Yu-Ting Liu Kuang-Pen Chou Yang-Yin Lin Jie Lu Guangquan Zhang Chun-Hsiang Chuang Wen-Chieh Lin Chin-Teng Lin Brain Research Center Institute of Electrical Control Engineering Institute of Computer Science and Engineering Electronic Systems Research Division National Chung-Shan Institute of Science and Technology (NCSIST) Taoyuan Taiwan Faculty of Engineering and Information Technology University of Technology Sydney Sydney Australia Department of Computer Science National Chiao-Tung University Hsinchu Taiwan

ISBN: (纸本)9781509006274

A brain-computer interface (BCI) system provides a convenient means of communication between the human brain and a computer, which is applied not only to healthy people but also for people that suffer from motor neuron diseases (MNDs). Motor imagery (MI) is one well-known basis for designing Electroencephalography (EEG)-based real-life BCI systems. However, EEG signals are often contaminated with severe noise and various uncertainties, imprecise and incomplete information streams. Therefore, this study proposes spectrum ensemble based on swam-optimized fuzzy integral for integrating decisions from sub-band classifiers that are established by a sub-band common spatial pattern (SBCSP) method. Firstly, the SBCSP effectively extracts features from EEG signals, and thereby the multiple linear discriminant analysis (MLDA) is employed during a MI classification task. Subsequently, particle swarm optimization (PSO) is used to regulate the subject-specific parameters for assigning optimal confidence levels for classifiers used in the fuzzy integral during the fuzzy fusion stage of the proposed system. Moreover, BCI systems usually tend to have complex architectures, be bulky in size, and require time-consuming processing. To overcome this drawback, a wireless and wearable EEG measurement system is investigated in this study. Finally, in our experimental result, the proposed system is found to produce significant improvement in terms of the receiver operating characteristic (ROC) curve. Furthermore, we demonstrate that a robotic arm can be reliably controlled using the proposed BCI system. This paper presents novel insights regarding the possibility of using the proposed MI-based BCI system in real-life applications.

关键词： Electroencephalography Feature extraction Wireless sensor networks Wireless communication Electrodes Particle swarm optimization Microcontrollers

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An MOT-TDIE solver for analyzing transient fields on graphene-based devices

An MOT-TDIE solver for analyzing transient fields on graphen...

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Antennas and Propagation Society International Symposium

作者： Yifei Shi Ping Li Ismail E. Uysal H. Arda Ulku Hakan Bagci Division of Computer King Abdullah University of Science and Technology Thuwal Saudi Arabia School of Electrical and Computer Engineering Purdue University West Lafavette IN USA King Abdullah University of Science and Technology Thuwal SA Department of Electronics-Engineering Gebze Technical University Kocaeli Gebze Turkey

A marching on-in-time (MOT) scheme for analyzing transient electromagnetic wave interactions on devices consisting of graphene sheets and dielectric substrates is proposed. The MOT scheme discretizes time domain resistive boundary condition (TD-RBC) and Poggio-Miller-Chang-Harrington-Wu-Tsai (TD-PMCHWT) integral equation, which are enforced on the surfaces of the graphene and dielectric substrate, respectively. The expressions of the time domain resistivity and conductivity of the graphene sheet are obtained analytically from the intra-band contribution formulated in frequency domain. Numerical results, which demonstrate the applicability of the proposed scheme, are presented.

关键词： Graphene Time-domain analysis Antennas Conductivity Mathematical model Boundary conditions Integral equations

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Performance Comparison of a Planar Substrate-Integrated Fabry-Perot Cavity Antenna with Different Unit Cells at Terahertz Frequency

Performance Comparison of a Planar Substrate-Integrated Fabr...

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European Conference on Antennas and Propagation

作者： Niamat Hussain Truong Khang Nguyen Ikmo Park Department of Electrical and Computer Engineering Ajou University Suwon. Republic of Korea Division of Computational Mathematics and Engineering (CME) Institute for Computational Science (INCOS) Ton Duc Thang University Ho Chi Minh City Vietnam

ISBN: (纸本)9781509022342

In this paper, we investigate and compare the radiation characteristics of a planar substrate-integrated Fabry-Perot cavity antenna designed with different unit-cell geometries. The antenna consists of a frequency selective surface (FSS) and a planar feeding structure, which are both lithographically patterned on a high-permittivity substrate. The planar feeding structure is an open-ended leaky-wave slit with a large ground plane, while the FSS is a 7 x 7 array of unit cells. Antennas with FSSs using different unit-cell geometries were studied at a frequency of around 0.315 THz. The numerical results showed that the FSS with square-patch unit cells achieved the best maximum gain of 14.3 dBi, while the FSS with circular-patch unit cells produced the best 3-dB gain bandwidth of 3%.

关键词： Fabry-Perot frequency selective surface leaky-wave slit unit cell

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Solar energetic particle events observed by the PAMELA mission

arXiv

引用

arXiv 2018年

作者： Bruno, A. Bazilevskaya, G.A. Boezio, M. Christian, E.R. de Nolfo, G.A. Martucci, M. Merge, M. Mikhailov, V.V. Munini, R. Richardson, I.G. Ryan, J.M. Stochaj, S. Adriani, O. Barbarino, G.C. Bellotti, R. Bogomolov, E.A. Bongi, M. Bonvicini, V. Bottai, S. Cafagna, F. Campana, D. Carlson, P. Casolino, M. Castellini, G. de Santis, C. Di Felice, V. Galper, A.M. Karelin, A.V. Koldashov, S.V. Koldobskiy, S. Krutkov, S.Y. Kvashnin, A.N. Leonov, A. Malakhov, V. Marcelli, L. Mayorov, A.G. Menn, W. Mocchiutti, E. Monaco, A. Mori, N. Osteria, G. Panico, B. Papini, P. Pearce, M. Picozza, P. Ricci, M. Ricciarini, S.B. Simon, M. Sparvoli, R. Spillantini, P. Stozhkov, Y.I. Vacchi, A. Vannuccini, E. Vasilyev, G.I. Voronov, S.A. Yurkin, Y.T. Zampa, G. Zampa, N. Heliophysics Division NASA Goddard Space Flight Center GreenbeltMD United States INFN Sezione di Bari BariI-70126 Italy Lebedev Physical Institute MoscowRU-119991 Russia INFN Sezione di Trieste TriesteI-34149 Italy Department of Physics University of Rome "Tor Vergata" RomeI-00133 Italy INFN Laboratori Nazionali di Frascati Via Enrico Fermi 40 FrascatiI-00044 Italy INFN Sezione di Rome "Tor Vergata" RomeI-00133 Italy National Research Nuclear University MEPhI MoscowRU-115409 Russia Department of Astronomy University of Maryland College ParkMD United States Space Science Center University of New Hampshire DurhamNH United States Electrical and Computer Engineering New Mexico State University Las CrucesNM United States Department of Physics and Astronomy University of Florence Sesto FiorentinoFlorenceI-50019 Italy INFN Sezione di Florence Sesto FiorentinoFlorenceI-50019 Italy Department of Physics University of Naples "Federico II" NaplesI-80126 Italy INFN Sezione di Naples NaplesI-80126 Italy Department of Physics University of Bari BariI-70126 Italy Ioffe Physical Technical Institute St. PetersburgRU-194021 Russia KTH Department of Physics Oskar Klein Centre for Cosmoparticle RIKEN Advanced Science Institute Wako-shi Saitama Japan IFAC Sesto FiorentinoFlorenceI-50019 Italy Science Data Center Via del Politecnico snc RomeI-00133 Italy Department of Physics Universität Siegen SiegenD-57068 Germany KTH Department of Physics Oskar Klein Centre for Cosmoparticle Physics AlbaNova University Centre StockholmSE-10691 Sweden IAPS/INAF RomeI-00133 Italy Department of Mathematics Computer Science and Physics University of Udine UdineI-33100 Italy

Despite the significant progress achieved in recent years, the physical mechanisms underlying the origin of solar energetic particles (SEPs) are still a matter of debate. The complex nature of both particle acceleration and transport poses challenges to developing a universal picture of SEP events that encompasses both the low-energy (from tens of keV to a few hundreds of MeV) observations made by space-based instruments and the GeV particles detected by the worldwide network of neutron monitors in ground-level enhancements (GLEs). The high-precision data collected by the Payload for Antimatter Matter Exploration and Light-nuclei Astrophysics (PAMELA) satellite experiment offer a unique opportunity to study the SEP fluxes between ∼80 MeV and a few GeV, significantly improving the characterization of the most energetic events. In particular, PAMELA can measure for the first time with good accuracy the spectral features at moderate and high energies, providing important constraints for current SEP models. In addition, the PAMELA observations allow the relationship between low and high-energy particles to be investigated, enabling a clearer view of the SEP origin. No qualitative distinction between the spectral shapes of GLE, sub-GLE and non-GLE events is observed, suggesting that GLEs are not a separate class, but are the subset of a continuous distribution of SEP events that are more intense at high energies. While the spectral forms found are to be consistent with diffusive shock acceleration theory, which predicts spectral rollovers at high energies that are attributed to particles escaping the shock region during acceleration, further work is required to explore the relative influences of acceleration and transport processes on SEP spectra. Copyright © 2018, The Authors. All rights reserved.

关键词： Astrophysics

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First Insights into the Viral Communities of the Deep-sea Anoxic Brines of the Red Sea

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Genomics, Proteomics & Bioinformatics 2015年第5期13卷 304-309页

作者： Andr Antunes Intikhab Alam Marta Filipa Simoes Camille Daniels Ari J.S.Ferreira Rania Siam Hamza El-Dorry Vladimir B.Bajic Computational Bioscience Research Center (CBRC) ComputerElectrical and Mathematical Sciences and Engineering Division (CEMSE)King Abdullah University of Science and Technology (KAUST) Red Sea Research Center (RSRC) Biological and Environmental Sciences and Engineering Division (BESE)King Abdullah University of Science and Technology (KAUST) Biology Department American University in Cairo

The deep-sea brines of the Red Sea include some of the most extreme and unique envi- ronments on Earth. They combine high salinities with increases in temperature, heavy metals, hydrostatic pressure, and anoxic conditions, creating unique settings for thriving populations of novel extremophiles. Despite a recent increase of studies focusing on these unusual biotopes, their viral communities remain unexplored. The current survey explores four metagenomic datasets obtained from different brine-seawater interface samples, focusing specifically on the diversity of their viral communities. Data analysis confirmed that the particle-attached viral communities present in the brine-seawater interfaces were diverse and generally dominated by Candovirales, yet appearing distinct from sample to sample. With a level of caution, we report the unexpected finding of Phycodnaviridae, which infects algae and plants, and trace amounts of insect-infecting Iridoviridae. Results from Kebrit Deep revealed stratification in the viral communities present in the interface： the upper-interface was enriched with viruses associated with typical marine bacteria, while the lower-interface was enriched with haloviruses and halophages. These results provide first insights into the unexplored viral communities present in deep-sea brines of the Red Sea, represent- ing one of the first steps for ongoing and future sampling efforts and studies.

关键词： Viral diversity Metagenomics Brine-seawater interface Caudovirales Red Sea

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