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17th International Conference on Parallel and Distributed Computing, Applications and Technologies, PDCAT 2016

作者： Dong, Baihong Deng, Jian Wu, Weigang Meng, Tianyu 1. School of Data and Computer Science Sun Yat-Sen Univ. China Guangdong Province Key Lab. of Big Data Analysis and Processing China Key Laboratory of Machine Intelligence and Advanced Computing Ministry of Education Guangzhou China

ISBN: (纸本)9781509050819

With the development of the technology, Vehicular Ad-hoc Network is developing rapidly and continuously. And many new algorithms in VANET were put forward. For example, many people apply the Named data Networks or Software Defined Networking6 to the VANET. However, few researches are looking into the analysis of the topology of the VANET, among most of which are based on simple situations and calculation of the track of vehicles. And therefore, these analysis are inadequate for analyzing the topology under complex situations. This paper is going to put forward a new method for analyzing the change of the topology of VANET, which is capable to quantitatively analyze the change under different and complex situations. In the real experiment, when compared with traditional analysis methods, this new method can analyze more precisely the impact of some possible wireless communication problem on the change of the topology, for example, the impact of hidden node on the vehicular wireless communication and whether the number or the density of vehicles makes the topology of VANET more stable. And this new method can provide a numerical result instead of purely qualitative analysis. © 2016 IEEE.

关键词： Topology

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An attribute reduction framework for inconsistent decision tables from view of the boundary region

An attribute reduction framework for inconsistent decision t...

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2016 International Conference on Machine Learning and Cybernetics, ICMLC 2016

作者： Qian, Jin Chang, Yu-Hui Lv, Ping Key Laboratory of Cloud Computing and Intelligent Information Processing of Changzhou City Jiangsu University of Technology Changzhou213015 China Jiangsu Key Laboratory of Big Data Analysis Technology/B-DAT Nanjing University of Information Science and Technology Nanjing China

ISBN: (纸本)9781509003891

Attribute reduction is one of the key issues for data preprocess in data mining. Many heuristic attribute reduction algorithms based on discernibility matrix have been proposed for inconsistent decision tables. However, these methods are usually computationally time-consuming. To address this issue, the derived consistent decision tables are defined for different definitions of relative reducts. The computations for different reducts of the original inconsistent decision tables are converted into the computations for their corresponding reducts of the derived consistent datasets. The relative discernibility object pair and the more optimal relative discernibility degree from view of the boundary region are designed to accelerate the attribute reduction process. An efficient attribute reduction framework using relative discernibility degree is proposed for large datasets. Experimental results show that our attribute reduction algorithms are effective and feasible for large inconsistent datasets. © 2016 IEEE.

关键词： Decision tables

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Maximizing power saving with state transition overhead for multiple mobile subscriber stations in WiMAX

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Frontiers of Information Technology & Electronic Engineering 2016年第10期17卷 1085-1094页

作者： Bo LI Sung-kwon PARK Department of Electronic Engineering Hanyang University Seoul 133791 Korea Guangdong Provincial Key Laboratory of Big Data Analysis and Processing Sun Yat-Sen University Guangzhou 510006 China

In the IEEE 802.16e/m standard, three power saving classes （PSCs） are defined to save the energy of a mobile sub- scriber station （MSS）. However, how to set the parameters of PSCs to maximize the power saving and guarantee the quality of service is not specified in the standard. Thus, many algorithms were proposed to set the PSCs in IEEE 802.16 networks. However, most of the proposed algorithms consider only the power saving for a single MSS. In the algorithms designed for multiple MSSs, the sleep state, which is set for activation of state transition overhead power, is not considered. The PSC setting for real-time connections in multiple MSSs with consideration of the state transition overhead is studied. The problem is non-deterministic polynomial time hard （NP-hard）, and a suboptimal algorithm for the problem is proposed. Simulation results demonstrate that the energy saving of the proposed algorithm is higher than that of state-of-the-art algorithms and approaches the optimum limit.

关键词： Power saving class State transition overhead IEEE 802.16e/m Quality of service

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GOODS-ALMA 2.0: Starbursts in the main sequence reveal compact star formation regulating galaxy evolution prequenching

arXiv

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arXiv 2022年

作者： Gómez-Guijarro, Carlos Elbaz, D. Xiao, M. Kokorev, V.I. Magdis, G.E. Magnelli, B. Daddi, E. Valentino, F. Sargent, M.T. Dickinson, M. Béthermin, M. Franco, M. Pope, A. Kalita, B.S. Ciesla, L. Demarco, R. Inami, H. Rujopakarn, W. Shu, X. Wang, T. Zhou, L. Alexander, D.M. Bournaud, F. Chary, R. Ferguson, H.C. Finkelstein, S.L. Giavalisco, M. Iono, D. Juneau, S. Kartaltepe, J.S. Lagache, G. Le Floc'h, E. Leiton, R. Leroy, L. Lin, L. Motohara, K. Mullaney, J. Okumura, K. Pannella, M. Papovich, C. Treister, E. AIM CEA CNRS Université Paris-Saclay Université Paris Diderot Sorbonne Paris Cité Gif-sur-Yvette F-91191 France School of Astronomy and Space Science Nanjing University Nanjing210093 China Denmark Niels Bohr Institute University of Copenhagen Jagtvej 128 Copenhagen N DK-2200 Denmark DTU-Space Technical University of Denmark Elektrovej 327 Kgs. Lyngby DK-2800 Denmark Astronomy Centre Department of Physics and Astronomy University of Sussex BrightonBN1 9QH United Kingdom Hallerstrasse 6 BernCH-3012 Switzerland Community Science and Data Center NSF's NOIRLab 950 N. Cherry Ave. TucsonAZ85719 United States Aix Marseille Université CNRS LAM Laboratoire d'Astrophysique de Marseille Marseille France Centre for Astrophysics Research University of Hertfordshire HatfieldAL10 9AB United Kingdom Astronomy Department University of Massachusetts AmherstMA01003 United States Departamento de Astronomía Facultad de Ciencias Fsicas y Matemáticas Universidad de Concepción Concepción Chile Hiroshima Astrophysical Science Center Hiroshima University 1-3-1 Kagamiyama Hiroshima Higashi-Hiroshima 739-8526 Japan Department of Physics Faculty of Science Chulalongkorn University 254 Phayathai Road Pathumwan Bangkok10330 Thailand Don Kaeo Mae Rim Chiang Mai50180 Thailand UTIAS The University of Tokyo Chiba Kashiwa277-8583 Japan Department of Physics Anhui Normal University Anhui Wuhu241000 China Key Laboratory of Modern Astronomy and Astrophysics Nanjing University Ministry of Education Nanjing210093 China Centre for Extragalactic Astronomy Department of Physics Durham University DurhamDH1 3LE United Kingdom Infrared Processing and Analysis Center MS314-6 California Institute of Technology PasadenaCA91125 United States Space Telescope Science Institute 3700 San Martin Drive BaltimoreMD21218 United States Department of Astronomy The University of Texas at Austin AustinTX78712 United States National Astronomical Observatory of Jap

Compact star formation appears to be generally common in dusty star-forming galaxies (SFGs). However, its role in the framework set by the scaling relations in galaxy evolution remains to be understood. In this work we follow up on the galaxy sample from the GOODS-ALMA 2.0 survey, an ALMA blind survey at 1.1 mm covering a continuous area of 72.42 arcmin2 using two array configurations. We derived physical properties, such as star formation rates, gas fractions, depletion timescales, and dust temperatures for the galaxy sample built from the survey. There exists a subset of galaxies that exhibit starburst-like short depletion timescales, but they are located within the scatter of the so-called main sequence of SFGs. These are dubbed starbursts in the main sequence and display the most compact star formation and they are characterized by the shortest depletion timescales, lowest gas fractions, and highest dust temperatures of the galaxy sample, compared to typical SFGs at the same stellar mass and redshift. They are also very massive, accounting for ∼ 60% of the most massive galaxies in the sample (log(M∗/M ) > 11.0). We find trends between the areas of the ongoing star formation regions and the derived physical properties for the sample, unveiling the role of compact star formation as a physical driver of these properties. Starbursts in the main sequence appear to be the extreme cases of these trends. We discuss possible scenarios of galaxy evolution to explain the results drawn from our galaxy sample. Our findings suggest that the star formation rate is sustained in SFGs by gas and star formation compression, keeping them within the main sequence even when their gas fractions are low and they are presumably on the way to quiescence. Copyright © 2022, The Authors. All rights reserved.

关键词： Galaxies

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A hierarchical image matting model for blood vessel segmentation in fundus images

arXiv

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arXiv 2017年

作者： Fan, Zhun Lu, Jiewei Li, Wenji Wei, Caimin Huang, Han Cai, Xinye Chen, Xinjian Guangdong Provincial Key Laboratory of Digital Signal and Image Processing College of Engineering Shantou University Shan'tou515063 China Department of Mathematics Shantou University Shan'tou515063 China School of Software Engineering South China University of Technology Guang'zhou510006 China College of Computer Science and Technology Nanjing University of Aeronautics and Astronautics Jiang'su210016 China Medical Image Processing and Analysis Lab School of Electronics and Information Engineering Soochow University Su'zhou215006 China

In this paper, a hierarchical image matting model is proposed to extract blood vessels from fundus images. More specifically, a hierarchical strategy utilizing the continuity and extendibility of retinal blood vessels is integrated into the image matting model for blood vessel segmentation. Normally the matting models require the user specified trimap, which separates the input image into three regions manually: the foreground, background and unknown regions. However, since creating a user specified trimap is a tedious and time-consuming task, region features of blood vessels are used to generate the trimap automatically in this paper. The proposed model has low computational complexity and outperforms many other state-of-art supervised and unsupervised methods in terms of accuracy, which achieves a vessel segmentation accuracy of 96.0%, 95.7% and 95.1% in an average time of 10.72s, 15.74s and 50.71s on images from three publicly available fundus image datasets DRIVE, STARE, and CHASE_DB1, respectively. Copyright © 2017, The Authors. All rights reserved.

关键词： Blood vessels

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DTC: A Dynamic Transaction Chopping Technique for Geo-replicated Storage Systems

DTC: A Dynamic Transaction Chopping Technique for Geo-replic...

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Reliable Distributed Systems

作者： Ning Huang Lihui Wu Weigang Wu Guangdong Province Key Laboratory of Big Data Analysis and Processing Guangzhou China School of Data and Computer Science Sun Yat-Sen University

ISBN: (纸本)9781509035144

Large Web applications usually require replicating data across geo-distributed datacenters to achieve high locality, durability and availability. However, maintaining strong consistency in geo-replicated systems usually suffers from long latency due to costly coordination across datacenters. Among others, transaction chopping is an effective and efficient approach to cope with such a challenge. In this paper, we propose DTC (Dynamic Transaction Chopping), a novel technique that chops transactions and checks their conflicts in a dynamic and automatic way, during application execution. DTC mainly consists of two parts: a dynamic chopper that chops transaction dynamically according to data partition scheme, and a conflict detection algorithm for determining the safety of the dynamic chopping. Compared with existing transaction chopping technique for geo-replicated systems, DTC has several advantages, including transparency to programmers, flexibility in conflict analysis, high degree of piecewise execution, and adaptability to dynamic partition schemes. We implement our DTC technique and conduct experiments to examine the correctness of DTC and evaluate its performance. The experiment results show that our DTC technique can achieve much more piecewise execution than the existing chopping approach does, and reduce execution time obviously.

关键词： Servers databases Heuristic algorithms Safety Concurrency control Choppers (circuits) Memory

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Software Defined Networking Based On-Demand Routing Protocol in Vehicle Ad Hoc Networks

Software Defined Networking Based On-Demand Routing Protocol...

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International Conference on Mobile Ad-hoc and Sensor Networks, MSN

作者： Baihong Dong Weigang Wu Zhiwei Yang Junjie Li School of Data and Computer Science Sun Yat-Sen University Guangdong Key Lab. of Big Data Analysis and Processing Key Laboratory of Machine Intelligence and Advanced Computing Ministry of Education Guangzhou

ISBN: (纸本)9781509056972

This paper comes up with a SDN based On-Demand Routing Protocol, SVAO, which separates data forwarding layer and network control layer, as in SDN, to enhance the data transmission efficiency within VANETs. The Roadside Service Unit plays the role of Local Controller and is in charge of selecting vehicles to forward packet within a road segment. All the vehicles state in the road. Correspondingly, a two-level design is used. Global Level is distributed and adopts a ranked query scheme to collect vehicle information and determine the road segments along which a message should be forwarded. And the Local Level is in charge of selecting forwarding vehicles in each road segment determined by the global level. We compare SVAO with popular ad-hoc network routing protocols, including OLSR, DSR, DSDV, and DB via simulations. We consider the impact of vehicle density, speed on data transmission rate and average packet delay. The simulation results show that in case of large network scales or high vehicle speed, SVAO performs better than the others.

关键词： Routing protocols Roads Routing Ad hoc networks Topology Vehicle dynamics

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Learning robust and discriminative low-rank representations for face recognition with occlusion

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Pattern Recognition 2017年 66卷 129-143页

作者： Guangwei Gao Jian Yang Xiao-Yuan Jing Fumin Shen Wankou Yang Dong Yue Institute of Advanced Technology Nanjing University of Posts and Telecommunications Nanjing China Jiangsu Engineering Laboratory of Big Data Analysis and Control for active distribution network Nanjing University of Posts and Telecommunications Nanjing China Fujian Provincial Key Laboratory of Information Processing and Intelligent Control (Minjiang University) Fuzhou China School of Computer Science and Engineering Nanjing University of Science and Technology Nanjing China School of Automation Nanjing University of Posts and Telecommunications Nanjing China School of Computer Science and Engineering University of Electronic Science and Technology of China Chengdu China School of Automation Southeast University Nanjing China

For robust face recognition tasks, we particularly focus on the ubiquitous scenarios where both training and testing images are corrupted due to occlusions. Previous low-rank based methods stacked each error image into a vector and then used L 1 or L 2 norm to measure the error matrix. However, in the stacking step, the structure information of the error image can be lost. Depart from the previous methods, in this paper, we propose a novel method by exploiting the low-rankness of both the data representation and each occlusion-induced error image simultaneously, by which the global structure of data together with the error images can be well captured. In order to learn more discriminative low-rank representations, we formulate our objective such that the learned representations are optimal for classification with the available supervised information and close to an ideal-code regularization term. With strong structure information preserving and discrimination capabilities, the learned robust and discriminative low-rank representation (RDLRR) works very well on face recognition problems, especially with face images corrupted by continuous occlusions. Together with a simple linear classifier, the proposed approach is shown to outperform several other state-of-the-art face recognition methods on databases with a variety of face variations.

关键词： Face recognition Low-rank matrix recovery Nuclear norm

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Improving artificial bee colony algorithm with historical archive 11th

Improving artificial bee colony algorithm with historical ar...

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11th International Conference on Bio-inspired Computing – Theories and Applications, BIC-TA 2016

作者： Zhou, Yalan Wang, Jiahai Gao, Shangce Yang, Xing Yin, Jian College of Information Guangdong University of Finance & Economics Guangzhou510320 China Department of Computer Science Sun Yat-sen University Guangzhou510006 China Guangdong Province Key Laboratory of Big Data Analysis and Processing Guangzhou510006 China Faculty of Engineering University of Toyama Toyama-shi930-8555 Japan

ISBN: (纸本)9789811036132

In this study, an artificial bee colony with historical archive (HAABC) is proposed to help ABC escape from stagnation situation. The proposed framework keeps track of the search history and stores excellent successful solutions into an archive. Once stagnation is detected in scout bees phase of ABC, a new individual is generated by utilizing the historical archive. Experimental results on 28 benchmark functions show that the proposed framework significantly improves the performance of basic ABC and five state-of-the-art ABC algorithms. © Springer Nature Singapore Pte Ltd. 2016.

关键词： Benchmarking

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The effect of point defects on electronic and optical properties of orthogonally Ca2Si

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AIP Conference Proceedings 2018年第1期1971卷

作者： Lyu Lin Weifu Cen Yinye Yang 1College of Data-Science and Information Engineering Guizhou Minzu University Guiyang 550025 China 2Engineering Training Center Guizhou Minzu University Guiyang 550025 China 4Special and Key Laboratory of Guizhou Provincial Higher Education for Photoelectric Information Processing and Analysis Guizhou Minzu University Guiyang 550025 China 3College of Materials Engineering Guizhou Minzu University Guiyang 550025 China

The orthogonally Ca2Si compound is a new kind of environmental-friendly semiconductor material. The geometrical structures, energy band structures, density of states and optical properties of orthogonally Ca2Si with point defects have been calculated by the density functional theory (DFT) of the first-principles pseudo potential method wave method. The calculated results shown that the lattice volume of the orthogonally Ca2Si with the V-Si and CaSi defects have increased, the lattice volume of other defects is reduced. The Ca2Si compound with the V-Ca2 defect is direct-gap semiconductor, and the band gap is 0.3064eV. The antisite defects cause that Ca2Si to become an indirect-gap semiconductor. The Ca2Si compound with the V-Ca1 and V-Si defects present the semimetal behavior. The effect intensity of six kinds of defects on the dielectric function and refractive index of Ca2Si is V-Ca2> CaSi> V-Si> V-Ca1> SiCa1> SiCa2. The effect of the SiCa2 defect is the greatest for the absorption coefficient and photoconductivity, and the change of the CaSi defect is the weakest. The influence on energy-loss function and reflection spectrum is that the antisite defects is larger than the vacancy defects.

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