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arXiv 2019年

作者： Zhang, Heng Zhang, Yan You, Jia-Huai Feng, Zhiyong Jiang, Guifei College of Intelligence and Computing Tianjin University Tianjin China School of Computing Engineering and Mathematics Western Sydney University Penrith Australia School of Computer Science and Technology Huazhong University of Technology and Science Wuhan China Department of Computing Science University of Alberta Edmonton Canada College of Software Nankai University Tianjin China

An ontology language for ontology mediated query answering (OMQA-language) is universal for a family of OMQA-languages if it is the most expressive one among this family. In this paper, we focus on three families of tractable OMQA-languages, including first-order rewritable languages and languages whose data complexity of the query answering is in AC0 or PTIME. On the negative side, we prove that there is, in general, no universal language for each of these families of languages. On the positive side, we propose a novel property, the locality, to approximate the first-order rewritability, and show that there exists a language of disjunctive embedded dependencies that is universal for the family of OMQA-languages with locality. All of these results apply to OMQA with query languages such as conjunctive queries, unions of conjunctive queries and acyclic conjunctive queries. Copyright © 2019, The Authors. All rights reserved.

关键词： Ontology

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Remote Sensing Scene Classification Based on Improved GhostNet

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Journal of Physics: Conference Series 2020年第1期1621卷

作者： Biyun Wei Xiaole Shen Yule Yuan College of Big Data and Internet Shenzhen Technology University Shenzhen China College of Applied Technology Shenzhen University Shenzhen China College of Computer Science and Software Engineering Shenzhen University Shenzhen China

Nowadays, the design of convolutional neural network (CNN) models is getting deeper and wider. When traditional CNN is used to process limited data of remote sensing images, it will lead to overfitting. We will use lightweight and efficient models to classify remote sensing images. In order to improve the classification accuracy and reduce the intermediate parameters, we improved GhostNet and proposed a smaller CNN named Improved GhostNet. Meanwhile, we use image enhancement methods to enlarge the datasets and dropout, it will reduce the amount of parameters. We experimented on three datasets, such as AID, UC Merced, NWPU-RESISC45. Then, we used MobileNetV3-Small and GhostNet to compare with our CNN model. The classification accuracy of improved GhostNet achieves more than 91%, and the accuracy on the AID is improved by 2.05% compared to the original GhostNet. These results demonstrate the effectiveness and efficiency of improved GhostNet.

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A faster v-order string comparison algorithm 22

A faster v-order string comparison algorithm

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22nd Prague Stringology Conference, PSC 2018

作者： Alatabbi, Ali Daykin, Jacqueline W. Mhaskar, Neerja Rahman, M. Sohel Smyth, William F. Department of Informatics King's College London London United Kingdom Department of Computer Science Aberystwyth University Department of Information Science Stellenbosch University South Africa Algorithms Research Group Department of Computing and Software McMaster University Canada Department of Computer Science and Engineering Bangladesh University of Engineering and Science Bangladesh School of Engineering and Information Technology Murdoch University WA Australia

ISBN: (纸本)9788001064849

V -order is a total order on strings that determines an instance of Unique Maximal Factorization Families (UMFFs) [7-10], a generalization of Lyndon words [12]. V -order has also recently been proposed as an alternative to lexicographic order (lexorder) in the computation of suffix arrays and in the suffix-sorting induced by the Burrows-Wheeler Transform (BWT) [11]. The central problem of efficient V -ordering of strings was considered in [2-4, 9, 10], culminating in a remarkably simple, linear time, constant space comparison algorithm [1]. In this paper we improve on this result to achieve significant speed-up in almost all cases of interest. © Proceedings of the Prague Stringology Conference, PSC 2018. All rights reserved.

关键词： Combinatorial mathematics

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college data analysis based on multi-learning method 3

College data analysis based on multi-learning method

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3rd IEEE International Conference on Big Data Analysis, ICBDA 2018

作者： Shuai, Jia Mo, Shaocong Yang, Yunyao Han, Xu Chen, Zhongyuan Xie, Zefeng Dai, Chao School of Computer Science and Technology Wuhan University of Technology Wuhan430070 China College of Computer Science and Technology Zhejiang University Hangzhou310027 China School of Computer Science and Engineering South China University of Technology Guangdong510006 China School of Computer Science and Technology Huazhong University of Science and Technology Wuhan430074 China Software School of Fudan University Shanghai201203 China

ISBN: (纸本)9781538647936

This paper proposes a new approach to data analysis based on multi-learning method. The proposed method employs a combination of principal component analysis, K-means clustering, random forest, deep neural network and Jack Philips ROI evaluation model, and is effective in solving the problem of choosing donation recipients. Results are validated through data envelop analysis and are believed to accurately reflect the reality. This research can be helpful to analyses of large scale economic problems. © 2018 IEEE.

关键词： Principal component analysis

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SDN-Based Routing Mechanism for Industrial Wireless Sensor Networks

SDN-Based Routing Mechanism for Industrial Wireless Sensor N...

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International Conference on Fuzzy Systems and Knowledge Discovery (FSKD)

作者： Dandan Cheng Xingwei Wang Shuang Zhang Min Huang College of Computer Science and Engineering College of Software Northeastern University Shenyang Liaoning CN

ISBN: (纸本)9781538680988;9781538680971

With the development of industrial network, Industrial Wireless Sensor Networks (IWSNs) outperform traditional wired automation system in terms of flexibility, scalability, and efficiency, etc. And IWSNs have critical demands on reliable and real-time data transmission. To meet these demands and enhance efficiency, a SDN-based routing mechanism for IWSNs is proposed in this paper, to determine the global optimal routing strategy based on the cognition of real-time network status. Firstly, a topology discovery algorithm based on multi-controller collaboration is proposed to improve the efficiency of the SDN controllers' cognition of network status, and each controller in the network can perceive the global network status by synchronizing information. Then, combined with the cognition of controllers for network status, a link quality-aware routing algorithm (LQAR) is proposed, further the global optimal routing is calculated and distributed to the field devices. Additionally, a node failure response strategy and a controller failure response strategy are proposed to enhance the reliability of the network. The simulation results show that the proposed routing mechanism can guarantee real-time data transmission and significantly improve the reliability compared with the traditional industrial wireless network routing mechanisms.

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Routing Strategy Based on Network Coding Under Energy Constraint in MDTN

Routing Strategy Based on Network Coding Under Energy Constr...

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International Conference on Communication software and Networks, ICCSN

作者： Yajuan Li Xiangyu Bai Xiaojuan Zhang College of Computer Science–College of Software Engineering Inner Mongolia University Hohhot China

The mobile delay tolerant network has some features results in transmit message is limited in one touch. In order to transmit more messages in one touch, network encoding technology is introduced. It effectively improves this problem. The mobile devices in the mobile delay tolerant network have the advantages of mobility, portability, but there are also problems, such as: limited energy, node sociality. When the energy of the node in the network is exhausted, it will affect the performance of the network. Therefore, the introduction of energy management strategies into the network coding routing strategy is of great significance to the performance improvement of the mobile delay tolerant network. In this paper, through the ONE to achieve the routing strategy proposed in this paper, and then compared with some existing routing strategy. Experimental results show that the routing strategy proposed in this paper can effectively improve the rate of message delivery, reduce delay, and reduce network overhead.

关键词： Network coding Routing Encoding Energy states Delays Energy management Heuristic algorithms

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Handshake between fibonacci series and pure preferential attachment mechanism on a graph-model

arXiv

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arXiv 2019年

作者： Ma, Fei Wang, Ding Wang, Ping Yao, Bing School of Electronics Engineering and Computer Science Peking University Beijing100871 China School of Software and Microelectronics Peking University Beijing102600 China College of Mathematics and Statistics Northwest Normal University Lanzhou730070 China

In order to better understand dynamical functions on amounts of natural and man-made complex systems, lots of researchers from a wide range of disciplines, covering statistic physics, mathematics, theoretical computer science, and so on, have spent much time in doing this intriguing study. In this paper, the discussed popularly topic, how to construct reasonable graph-model and then to explain many features of realistic networks using previously presented theoretical models, is still our main work. Compared with many pre-existing deterministic graph-model in single evolution way, our new graph-model can be constructed using three types of growth ways to meet preferential attachment mechanism. Meanwhile several typical indices associated with network research will be reported. In addition, some interesting findings will be shown, including the first handshake between Fibonacci series and pure preferential attachment mechanism, an obvious relationship connecting two well-known rules, power-law and Zipf-law, and a common but useful equation on the basis of both spanning trees number and the number of spanning trees with maximum leaves. Based on these foregoing discussions, we can demonstrate that our graph-model obeys power-law and smallworld property. For the future research directions, we present some unknown problems to be studied at the end of this paper. Copyright © 2019, The Authors. All rights reserved.

关键词： Complex networks

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Necessities and challenges to strengthen the regional infrastructure resilience within city clusters

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Procedia engineering 2018年 212卷 198-205页

作者： S. Thomas Ng Frank J. Xu Yifan Yang Mengxue Lu Junjie Li Department of Civil Engineering The University of Hong Kong Pokfulam China College of Computer Science & Software Engineering Shenzhen University China

Building resilient infrastructure and making cities and human settlements inclusive, safe, resilient and sustainable are the important elements making up the goals of the 2030 Agenda for Sustainable Development. Economic development and population growth have brought diverse needs of citizens for urban mobility resulting in various forms of urbanization including suburbanization, urban sprawl, and local or cross-border city clusters, and this has generated greater citizens’ demands for quality, resilient, safe and secure infrastructure services. As infrastructures of different cities within a cluster are highly interdependent and interconnected, any minor disruptions of a single infrastructure component within a city could lead to unpredictable knock-on effects on its neighbors. Despite great research efforts being attributed to community and city resilience, there are limited studies focusing on regional infrastructure resilience within the city clusters, in particular those cross-border city clusters like the Pearl River Delta city cluster of China. This paper aims to investigate the necessities and challenges of strengthening regional infrastructure resilience within the city clusters by applying and extending an integrated framework for resilience management of internetwork city infrastructures developed by the authors. The necessities, gaps and challenges will be explored from multiple perspectives not least the organizational structure, people, policy, management process, technology and supporting system, as well as the decision-making and performance management perspectives. Two typical city clusters in China are selected for case studies. Programs and practices of the cities within the two clusters pertinent to sustainable development, climate change, urban planning, built environment management and hazard management are critically examined and analyzed to produce a panoramic view on the necessities and challenges. The findings of this research shall invoke

关键词： Infrastructure resilience regional resilience city cluster resilience management sustainable development

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Efficient zonal diagnosis with maximum satisfiability

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science China(Information sciences) 2018年第11期61卷 17-30页

作者： Meng LIU Dantong OUYANG Shaowei CAI Liming ZHANG College of Computer Science and Technology Jilin University Key Laboratory of Symbolic Computation and Knowledge Engineering Ministry of EducationJilin University State Key Laboratory of Computer Science Institute of Software Chinese Academy of Sciences

Model-based diagnosis(MBD) has been widely acknowledged as an effective diagnosis ***, for large scale circuits, it is difficult to find all cardinality-minimal diagnoses within a reasonable time. This paper proposes a novel method that takes a significant step in this direction. The idea is to divide a circuit into zones and compute the cardinality-minimal diagnoses by finding subset-minimal diagnoses with cardinality-minimal via a maximum satisfiability(MaxSAT) solver on an abstracted circuit that is composed of these zones instead of all components. We also propose a new propagate-extend method for extending the seed-TLDs to obtain all cardinality-minimal diagnoses efficiently. We implement our method with a state-of-the-art core-guided MaxSAT solver, and present evidence that it significantly improves the diagnosis efficiency on ISCAS-85 circuits. Our method outperforms SATbD, which was recently shown to outperform most complete MBD approaches using satisfiability(SAT).

关键词： model-based diagnosis MaxS AT subset-minimal diagnoses cardinality-minimal diagnoses zone propagate-extend

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StegoAppDB: A Steganography apps forensics image database

arXiv

引用

arXiv 2019年

作者： Newman, Jennifer Lin, Li Chen, Wenhao Reinders, Stephanie Wang, Yangxiao Wu, Min Guan, Yong Department of Mathematics Iowa State University AmesIA United States Department of Electrical & Computer Engineering Iowa State University AmesIA United States Department of Computer Science and Software Engineering University of Washington Bothell BothellWA United States Department of Electrical & Computer University of Maryland College ParkMD United States

In this paper, we present a new reference dataset simulating digital evidence for image steganography. Steganography detection is a digital image forensic topic that is relatively unknown in practical forensics, although stego app use in the wild is on the rise. This paper introduces the first database consisting of mobile phone photographs and stego images produced from mobile stego apps, including a rich set of side information, offering simulated digital evidence. StegoAppDB, a steganography apps forensics image database, contains over 810,000 innocent and stego images using a minimum of 10 different phone models from 24 distinct devices, with detailed provenanced data comprising a wide range of ISO and exposure settings, EXIF data, message information, embedding rates, etc. We develop a camera app, Cameraw, specifically for data acquisition, with multiple images per scene, saving simultaneously in both DNG and high-quality JPEG formats. Stego images are created from these original images using selected mobile stego apps through a careful process of reverse engineering. StegoAppDB contains cover-stego image pairs including for apps that resize the stego dimensions. We retain the original devices and continue to enlarge the database, and encourage the image forensics community to use StegoAppDB. While designed for steganography, we discuss uses of this publicly available database to other digital image forensic topics. Copyright © 2019, The Authors. All rights reserved.

关键词： Digital forensics

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