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arXiv 2017年

作者： Bauer, Franz E. Treister, Ezequiel Schawinski, Kevin Schulze, Steve Luo, Bin Alexander, David M. Brandt, William N. Comastri, Andrea Forster, Francisco Gilli, Roberto Kann, David Alexander Maeda, Keiichi Nomoto, Kenichi Paolillo, Maurizio Ranalli, Piero Schneider, Donald P. Shemmer, Ohad Tanaka, Masaomi Tolstov, Alexey Tominaga, Nozomu Tozzi, Paolo Vignali, Cristian Wang, Junxian Xue, Yongquan Yang, Guang Instituto de Astrofísica Facultad de Física Pontificia Universidad Católica de Chile 306 Santiago 22 Chile Nuncio Monseñor Sótero Sanz 100 Providencia Santiago Chile Space Science Institute 4750 Walnut Street Suite 205 BoulderCO80301 United States EMBIGGEN Anillo Concepción Chile Departamento de Astronomía Universidad de Concepción Casilla 160-C Concepción Chile Institute for Astronomy Department of Physics ETH Zurich Wolfgang-Pauli-Strasse 27 ZurichCH-8093 Switzerland School of Astronomy and Space Science Nanjing University Nanjing210093 China Ministry of Education Nanjing210093 China Department of Physics Durham University DurhamDH1 3LE United Kingdom Department of Astronomy and Astrophysics Pennsylvania State University 525 Davey Lab University ParkPA16802 United States Institute for Gravitation and the Cosmos Pennsylvania State University University ParkPA16802 United States Department of Physics 104 Davey Laboratory Pennsylvania State University University ParkPA16802 United States INAF-Osservatorio Astronomico di Bologna via Ranzani 1 Bologna40127 Italy Centro de Modelamiento Matemático Universidad de Chile Av. Blanco Encalada 2120 Piso 7 Santiago Chile Thüringer Landessternwarte Tautenburg Sternwarte 5 Tautenburg07778 Germany Department of Astronomy Kyoto University Kitashirakawa-Oiwake-cho Sakyo-ku Kyoto606-8502 Japan University of Tokyo KashiwaChiba277-8583 Japan Hamamatsu Department of Physics University Federico II via Cintia 9 Naples80126 Italy INFN - Sezione di Napoli via Cinthia 9 Naples80126 Italy Agenzia Spaziale Italiana Science Data Center via del Politecnico snc Roma00133 Italy Lund Observatory Department of Astronomy and Theoretical Physics Lund University Box 43 Lund22100 Sweden Department of Physics University of North Texas DentonTX76203 National Astronomical Observatory of Japan Mitaka Tokyo181-8588 Japan Department of Physics Faculty of Science and Engineering Konan University 8-

We report on the detection of a remarkable new fast high-energy transient found in the Chandra Deep Field-South, robustly associated with a faint (mR = 27.5 mag, zph∼2.2) host in the CANDELS survey. The X-ray event is comprised of 115+−1211 net 0.3–7.0 keV counts, with a light curve characterised by a ≈100 s rise time, a peak 0.3–10 keV flux of ≈5×10−12 erg s−1 cm−2, and a power-law decay time slope of −1.53 ± 0.27. The average spectral slope is Γ = 1.43+−00..2313, with no clear spectral variations. The X-ray and multi-wavelength properties effectively rule out the vast majority of previously observed high-energy transients. A few theoretical possibilities remain: an "orphan" X-ray afterglow from an off-axis short-duration Gamma-ray Burst (GRB) with weak optical emission;a low-luminosity GRB at high redshift with no prompt emission below ∼20 keV rest-frame;or a highly beamed Tidal Disruption Event (TDE) involving an intermediate-mass black hole and a white dwarf with little variability. However, none of the above scenarios can completely explain all observed properties. Although large uncertainties exist, the implied rate of such events is comparable to those of orphan and low-luminosity GRBs as well as rare TDEs, implying the discovery of an untapped regime for a known transient class, or a new type of variable phenomena whose nature remains to be determined. Copyright © 2017, The Authors. All rights reserved.

关键词： Luminance

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Barrier Lyapunov based control of dual-arm exoskeleton robots performing asymmetric bimanual tasks

Barrier Lyapunov based control of dual-arm exoskeleton robot...

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2014 International Conference on Advanced Mechatronic Systems, ICAMechS 2014

作者： Li, Zhijun Su, Hang Zhang, Hongbin Su, Chun-Yi Chai, Tianyou Yang, Chenguang Key Lab of Autonomous System and Network Control College of Automation Science and Engineering South China University of Technology Guangzhou China State Key Lab of Synthetical Automation for Process Industries Northeastern University Shengyang China

ISBN: (纸本)9781479963812

This paper presents Barrier Lyapunov Based Control of a dual-arm exoskeleton system by using the relative Jacobian technique. Two upper exoskeletons operates in a constrained region of the operational space, whose end-effector motions are defined by the relative motion between the two end effectors. Barrier composite energy function (BCEF) scheme with a novel Barrier Lyapunov Function is developed to help exoskeleton tracking desired trajectories within the constrained range and provides a convenient way of dynamics cancellation with minimal knowledge of the dynamics parameters of the dual arm. Finally, the performance of the proposed adaptive control is illustrated through extensive experiments using the developed exoskeleton. © 2014 IEEE.

关键词： Lyapunov functions

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Design and Prototype Implementation of Social Value Evaluation System for Voluntary Service

Design and Prototype Implementation of Social Value Evaluati...

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2015 IEEE Advanced Information technology,Electronic and Automation Control Conference(IAEAC 2015)

作者： Min Liu Fan Wu Feng Tian Haiping Zhu Nazaraf Shah Qinghua Zheng Yan Chen Department of Computer Science and Technology Xi'an Jiaotong University Shaanxi Province Key Lab.of Satellite and Terrestrial Network Tech.R&D Systems Engineering Institute Xi'an Jiaotong University Shaanxi Province Key Lab.of Satellite and Terrestrial Network Tech.R&D Department of Computer Science and Technology Coventry University

ISBN: (纸本)9781479919819

Evaluating the social value of voluntary service(especially the quality of collaborative service) not only measures the degree of society civilization,but also provides the guidance or indicator of overall arrangement of voluntary service and utilization efficiency of voluntary *** with the informatization development of the network,the release,implementation and evaluation of voluntary service can be integrated into a management information ***,the current research seldom involves comprehensive evaluation system,especially one considering the indicator of *** paper proposes a Social Value Evaluation System for Voluntary Service(SVESVS) and also presents design and implementation of prototype of the evaluation *** on simulated data and data obtained from national volunteer service platform,the proposed evaluation system is tested,visualized and validated from different *** the help of this information management system,the process tracking,monitoring and the resource integration of volunteer service can be achieved effectively.

关键词： voluntary service management information system evaluation system collaboration indicator

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Privilege separation in browser extensions based on web workers

Privilege separation in browser extensions based on web work...

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4th International Conference on Materials science and Information technology, MSIT 2014

作者： Yu, Chun Mei Sun, Jian Hua Chen, Hao Xu, Xiang Hua College of Information Science and Engineering Hunan University Changsha China Zhejiang Provincial Key Lab of Data Storage and Transmission Technology Hangzhou Dianzi University China

ISBN: (纸本)9783038351733

In this paper, we propose to use Web Workers [1], isolated parallel threads in current browser working in the background, to enforce privilege separation in chrome extensions. Our tests show that our design is applicable to most chrome extensions (those not using the jquery library) and achieves a reduction in TCB up to 77 percent for our examples. Our implementation shows that our design is efficient enough to enforce privilege separation in chrome extensions and not needs to modify the browser or learn new high-level languages. © (2014) Trans Tech Publications, Switzerland.

关键词： Separation

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Soil Organic Carbon Stock as Affected by Land Use/Cover Changes in the Humid Region of Northern Iran

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Journal of Mountain science 2014年第2期11卷 507-518页

作者： Samereh FALAHATKAR Seyed Mohsen HOSSEINI Abdolrassoul SALMAN MAHINY Shamsollah AYOUBI WANG Shao-qiang Faculty of Natural Resource and Marine Science Tarbiat Modares University Department of Environmental Sciences Gorgan University of Agricultural Sciences and Natural Resources Department of Soil Sciences College of Agriculture Isfahan University of Technology Key Lab of Ecosystem Network Observation and Modeling Institute of Geographic Sciences and Natural Resources Research

【Title】【Author】 This study was conducted to determine the changes in the soil carbon stocks as influenced by land use in a humid zone of Deylaman district （10,876 ha）, a mountainous region of northern Iran. For this, land use maps were produced from TM and ETM＋ images for 1985, 2000 and 2010 years; and this was supplemented by field measurement of soil carbon in 2010. The results showed that the mean soil organic carbon （SOC） density was 6.7±1.8 kg C m-2, 5.2±3.4 kg C m-2 and 3.2±1.8 kg C m-2 for 0-20 cm soil layer and 4.8±1.9 kg C m-2, 3.1±2 kg C m-2 and 2.7±1.8 kg C m-2 for 20-40 cm soil layer in forest, rangeland and cultivated land, respectively. During the past 25 years, 14.4% of the forest area had been converted to rangeland; and 28.4% of rangelands had been converted to cultivated land. According to the historical land use changes in the study area, the highest loss of SOC stocks resulted from the conversion of the forest to rangeland （0.45×104 Mg C in 0-40 cm depth layer）; and the conversion of rangeland to cultivated land （0.37×104 Mg C in 0-40 cm）, which typically led to the loss of soil carbon in the area studied. The knowledge on the historical land use changes and its influence on overall SOC stocks could be helpful for making management decision for farmers and policy managers in the future, for enhancing the potential of C sequestration in northern Iran.

关键词： Soil organic carbon stocks Land cover Land use Iran

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Make It Possible: Multilingual Sentiment Analysis without Much Prior Knowledge

Make It Possible: Multilingual Sentiment Analysis without Mu...

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IEEE WIC ACM International Conference on Web Intelligence (WI)

作者： Zheng Lin Xiaolong Jin Xueke Xu Yuanzhuo Wang Songbo Tan Xueqi Cheng CAS Key Laboratory on Network Data Science and Technology Institute of Computing Technology Chinese Academy of Sciences Beijing China

ISBN: (纸本)9781479941421

Sentiment analysis is a hard problem, while multilingual sentiment analysis is even harder due to the different expression styles in different languages. Although many methods for multilingual sentiment analysis have been developed in the open literature, most of them suffer from two major problems. The first is their excessive dependence on external tools or resources (e.g., Machine translation systems or bilingual dictionaries), which may not be readily obtained, especially for minority languages, The second is conflictive sentiments, i.e., The sentiment polarity of some parts of a text is inconsistent with its overall sentiment polarity. It is observed that in a product or service review there usually exist a few sentences which play a more important role in determining its sentiment polarity, as compared to others. Therefore, differentiating key sentences from trivial ones may be helpful to improve sentiment analysis. Inspired by this observation in this paper we propose a novel framework to estimate the sentiment polarity of reviews by virtue of opinion lexica and key sentences automatically extracted from unlabelled data. This framework cannot only overcome the problem of excessive dependence on external resources, but also is able to capture the overall sentiment polarity of reviews. Experimental results on realistic review datasets demonstrate that the proposed framework is effective and competitive with the representative baselines.

关键词： Sentiment analysis Dictionaries data mining Training Algorithm design and analysis Google Feature extraction

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A filtering algorithm for scattered point cloud based on curvature features classification

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Journal of Information and Computational science 2015年第2期12卷 525-532页

作者： Gu, Xiaoying Liu, Yongshan Wu, Qiong College of Information Science and Engineering Yanshan University Qinhuangdao China The Key Laboratory for Computer Virtual Technology and System Integration of Hebei Province Yanshan University Qinhuangdao China Data Industry Research Lab Qinhuangdao China

In order to remove the noise of three-dimensional scattered point cloud, and to smooth point cloud model effectively, an algorithm which uses different filtering strategies on different feature regions of a point cloud model is proposed. The algorithm firstly estimates the normal vectors of a point cloud model by using covariance analysis method, then estimates Gaussian curvatures of the point cloud model by using parabolic fitting method, and uses the average Gaussian curvature in the k-neighborhood as the threshold, to divide the point cloud model into flat neighborhood type regions and mutant neighborhood type regions, and, we use improved median filtering algorithm and bilateral filtering algorithm on different feature regions, so as to achieve the purpose of smoothing scattered point cloud. Experimental results show that it has a very good smoothing effect and maintains the detail features of the point cloud model, which has proved the algorithm is simple and effective. Copyright © 2015 Binary Information Press.

关键词： Three dimensional computer graphics

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Constrained least squares regression for semi-supervised learning

Constrained least squares regression for semi-supervised lea...

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18th Pacific-Asia Conference on Advances in Knowledge Discovery and data Mining, PAKDD 2014

作者： Liu, Bo Jing, Liping Yu, Jian Li, Jia Beijing Key Lab. of Traffic Data Analysis and Mining Beijing Jiaotong University Beijing 100044 China College of Information Science and Technology Agricultural University of Hebei Hebei 071000 China

ISBN: (纸本)9783319066042

The core tasks of graph based semi-supervised learning (GSSL) are constructing a proper graph and selecting suitable supervisory information. The ideal graph is able to outline the intrinsic data structure, and the ideal supervisory information could represent the whole data. In this paper, we propose a new graph learning method, called constrained least squares regression (CLSR), which integrates the supervisory information into graph learning process. To learn a more adaptive graph, regression coefficients and neighbor relations are combined in CLSR to capture the global and local data structures respectively. Moreover, as byproduct of CLSR, a new strategy is presented to select the high-quality data points as labeled samples, which is practical in real applications. Experimental results on different real world datasets demonstrate the effectiveness of CLSR and the sample selection strategy. © 2014 Springer International Publishing.

关键词： Least squares approximations

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A new adaptive universal fuzzy inference system with application 6

A new adaptive universal fuzzy inference system with applica...

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6th International Conference on Fuzzy Computation Theory and Applications, FCTA 2014, Part of the 6th International Joint Conference on Computational Intelligence, IJCCI 2014

作者： Chai, Yuan Yuan Chen, Jun Luo, Wei Jia, Li Min Network Center China Defense Science and Technology Information Center Fucheng Road 26# Beijing China State Key Lab of Rail Traffic Control and Safety Beijing Jiaotong University Beijing China

ISBN: (纸本)9789897580536

Through comprehensive study on existing fuzzy inference systems, this paper presents a Choquet integral-OWA operator based fuzzy inference system (AggFIS) in order to solve the traditional FIS disadvantages and its adaptive model which is named Choquet integral-OWA operator based adaptive universal fuzzy inference system (Agg-AUFIS). By considering the universal fuzzy inference operators and importance factor during reasoning process, Agg-AUFIS tries to express the essence of fuzzy logic and simulate human thinking pattern sufficiently, which could provide a new methodology for fuzzy modeling in future.

关键词： Fuzzy inference

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One forward-secure signature scheme using bilinear maps and its applications

One forward-secure signature scheme using bilinear maps and ...

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作者： Yu, Jia Kong, Fanyu Cheng, Xiangguo Hao, Rong Li, Guowen College of Information Engineering Qingdao University 266071 Qingdao China Shandong Provincial Key Laboratory of Computer Network 250014 Jinan China Institute of Network Security Shandong University 250100 Jinan China Key Lab of Cryptographic Technology and Information Security Ministry of Education Jinan 250100 China School of Computer Science and Technology Shandong Jianzhu University 250100 Jinan China

Forward-secure signatures are proposed to deal with the key exposure problem. Compared to regular signatures, forward-secure signatures have a special update algorithm that can evolve the new private key in each time period. Therefore, it can protect the security of signatures previous to the time period of key exposure. The efficiency is an important issue of forward-secure signatures. In this paper, we construct a new forward-secure signature scheme using bilinear maps. In this scheme, all performance parameters have complexities of log magnitude in terms of the total time periods. In addition, our scheme needs very few (only triple) pairing operations in the verifying algorithm, which is very important because the pairing operation is very time-consuming. This scheme is proved to be forward secure in the random oracle model assuming the CDH problem is hard. Finally, we give some applications of this scheme including constructing an intrusion-resilient signature scheme and constructing a forward-secure threshold signature scheme. © 2014 Elsevier Inc. All rights reserved.

关键词： Authentication

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