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Portraying User Life Status from Microblogging Posts

Tsinghua science and technology 2013年第2期18卷 182-195页

作者： Jiayu Tang Zhiyuan Liu Maosong Sun Jiahua Liu the State Key Laboratory of Intelligent Technology and Systems Tsinghua National Laboratory for Information Science and Technology Department of Computer Science and Technology Tsinghua University

Microblogging services nformation and express opinions pro by vide a novel and popular communication scheme for Web users to share publishing short posts, which usually reflect the users＇ daily life. We can thus model the users＇ daily status and interests according to their posts. Because of the high complexity and the large amount of the content of the microblog users＇ posts, it is necessary to provide a quick summary of the users＇ life status, both for personal users and commercial services. It is non-trivial to summarize the life status of microblog users, particularly when the summary is conducted over a long period. In this paper, we present a compact interactive visualization prototype, LifeCircle, as an efficient summary for exploring the long-term life status of microblog users. The radial visualization provides multiple views for a given microblog user, including annual topics, monthly keywords, monthly sentiments, and temporal trends of posts. We tightly integrate interactive visualization with novel and state-of-the-art microblogging analytics to maximize their advantages. We implement LifeCircle on Sina Weibo, the most popular microblogging service in China, and illustrate the effectiveness of our prototype with various case studies. Results show that our prototype makes users nostalgic and makes them reminiscent about past events, which helps them to better understand themselves and others

关键词： text visualization microblogging topic model sentiment analysis keyword extraction

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SENTIMENT ANALYSIS OF MICROBLOG TEXT BASED ON JOINT SENTIMENT-TOPIC MODEL

SENTIMENT ANALYSIS OF MICROBLOG TEXT BASED ON JOINT SENTIMEN...

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2014 IEEE 3rd International Conference on Cloud Computing and Intelligence systems

作者： Hui Zhang Hqun Liu Shaoping Ma State Key Laboratory of Intelligent Technology and Systems Tsinghua National Laboratory of Information Science and Technology Department of Computer Science and Technology Tsinghua University Operation Experiment Center Nanjing Army Command College

Sentiment Analysis of Microblog text is a challenging *** text is different with general user-generated text,because it often contains some special symbols such as "@ # //" and a lot of emotional *** joint sentiment-topic models did not consider these features of Microblog texts and then could not well model *** this paper,considering the structural features and content features of Microblog text,we present a semi-supervised joint sentiment-topic model(MB-PL-ASUM).This new model uses semistructured information and emotional symbol information to classify sentiments of Microblog text without labeling *** experiments of sentiment classification on real Sina Microblog texts show that MB-PL-ASUM outperforms word matching,JTS and ASUM model.

关键词： Microblog Text Sentiment Analysis Joint Sentiment-Topic Model Emotional Symbol

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Image Compression Algorithm Based On Reversible Integer Time-Domain Lapped Transform And Quadtree Partition

Image Compression Algorithm Based On Reversible Integer Time...

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2014 IEEE 7th Joint International Information technology and Artificial Intelligence Conference

作者： Xiuhua Ma Jiwen Dong Peilong Zhao Department of Computer Science and Technology Shandong Provincial Key Laboratory of Network based Intelligent Computing University of Jinan

ISBN: (纸本)9781479944187

A new image compression system based on quadtreepartition and reversible integer time-domain lapped transform(RTDLT) as core transform technology is proposed. The system obtained transformation region of different sizes through quadtree partition to remove the correlation between the pixels by utilizing features of image regions. The performance of reversible integer discrete cosine transform(RDCT) was improved with the method of quadtree partition. Superior performance can be achieved in most cases than the fixed block RTDLT and RDWT about the rate-distortion and subjective visual quality.

关键词： quadtree partition,reversible integer time-domain lapped transform,DCT,image compression

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C-Coupler1: a Chinese community coupler for earth system modelling

C-Coupler1: a Chinese community coupler for earth system mod...

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第一届中国大地测量和地球物理学学术大会

作者： Li Liu Guangwen Yang Bin Wang Cheng Zhang Ruizhe Li Zhiyuan Zhang Ministry of Education Key Laboratory for Earth System Modelling Center for Earth System Science(CESS Department of Computer Science and Technology Tsinghua UniversityBeijingChina Ministry of Educatio Ministry of Education Key Laboratory for Earth System Modelling Center for Earth System Science(CESS Department of Computer Science and Technology Tsinghua UniversityBeijingChina

Coupler is a fundamental software tool for earth system *** the requirements of 3-D coupling,high-level sharing,common model software platform and better parallel performance,we started to design and develop a community coupler (C-Coupler) from 2010 in China,and finished the first version (C-Coupler1) *** C-Coupler1 is a parallel 3-D coupler that achieves the same (bit- identical) result with any number of *** by the general design of the C- Coupler,the C-Coupler1 enables various component models and various coupled model versions to be integrated on the same common model software platform to achieve a higher-level sharing,where the component models and the coupler can keep the same code version in various model versions for ***,it provides the C-Coupler platform,a uniform runtime environment for operating various kinds of model simulations in the same *** the C-Coupler1 is ready for earth system modelling,and it is publicly *** China,there are more and more model groups using the C-Coupler1 for the development and application of models.

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A Method to Check Liveness of WS3PR 33

A Method to Check Liveness of WS3PR

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第三十三届中国控制会议

作者： WANG ShouGuang LIU Miao ZHOU MengChu WU WenHui IEEE School of Information & Electronic Engineering Zhejiang Gongshang University State Key Laboratory for Manufacturing Systems Engineering Xi’an Jiaotong University School of Electro-Mechanical Engineering Xidian University The Key Laboratory of Embedded System and Service Computing Ministry of EducationTongji University Department of Electrical and Computer Engineering New Jersey Institute of TechnologyNewarkNJ 07102USA

ISBN: (纸本)9781479947249

Petri nets are widely used to model flexible manufacturing systems(FMSs) because they can help analyze the properties and synthesize deadlock-free supervisory controllers of *** system of Simple Sequential Processes with Resources(WS3PR) is an important subclass of Petri nets that can well model many *** work first gives new algorithms to check liveness for a WS3 PR net via its subnet trees and *** the computation complexity for the proposed method is shown in this paper,to be polynomial under certain ***,sufficient conditions for deciding liveness of a WS3 PR are *** example is used to illustrate the results.

关键词： Liveness,flexible manufacturing system,deadlock,Petri net.

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On efficient bandwidth allocation for traffic variability in datacenters

On efficient bandwidth allocation for traffic variability in...

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IEEE Annual Joint Conference: INFOCOM, IEEE computer and Communications Societies

作者： Jian Guo Fangming Liu Xiaomeng Huang John C. S. Lui Mi Hu Qiao Gao Hai Jin Key Laboratory of Services Computing Technology and System Huazhong University of Science and Technology Ministry of Education Key Laboratory for Earth System Modeling Tsinghua University Department of Computer Science & Engineering The Chinese University of Hong Kong

Datacenter networks suffer unpredictable performance due to a lack of application level bandwidth guarantees. A lot of attentions have been drawn to solve this problem such as how to provide bandwidth guarantees for Virtualized Machines (VMs), proportional bandwidth share among tenants, and high network utilization under peak traffic. However, existing solutions fail to cope with highly dynamic traffic in datacenter networks. In this paper, we consider the effects of large numbers of short flows and massive bursty traffic in the datacenter, and design a novel distributed rate allocation algorithm based on the Logistic model under the control-theoretic framework. The theoretical analysis and experimental results using OpenFlow show that our algorithm not only guarantees the bandwidth for VMs, but also provides fast convergence to efficiency and fairness, and smooth response to bursty traffic.

关键词： Bandwidth Convergence Heuristic algorithms Algorithm design and analysis Resource management Channel allocation Logistics

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A Coupling-Based Approach for Class Integration and Test Order

A Coupling-Based Approach for Class Integration and Test Ord...

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IEEE Asia-Pacific Conference on Services Computing (APSCC)

作者： Hao Liu Jianxun Chen Processing and Real-time Industrial System Hubei Province Key Laboratory of Intelligent Information Wuhan China School of Computer Science and Technology Wuhan University of Science and Technology Wuhan China

Software testing is one of the most important techniques used to assure the quality of software service. An intricate issue in software testing is the determination of test orders for the integration test of classes, known as the class integration and test order (CITO) problem. The determination of such order has an influence on the cost of created stubs for classes, which is an error-prone and costly process. To minimize the cost of stubbing, this paper describes a coupling measure technique to estimate the complexity of each test stub, and presents a graph-based heuristic algorithm of removing node with the highest weights to break cycles for minimizing overall complexity of stubbing. Also, an adjacency matrix and depth-first search for finding all the paths is presented. Simulation experimental results show that the overall test stub complexity decreased which greatly improves test efficiency and reduces the test cost to some extent compared with others.

关键词： Couplings Complexity theory Testing Software Weight measurement Genetic algorithms Object oriented modeling

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Asymmetric excitation of surface plasmons by dark mode coupling

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science advances 2016年第2期2卷 e1501142页

作者： Xueqian Zhang Quan Xu Quan Li Yuehong Xu Jianqiang Gu Zhen Tian Chunmei Ouyang Yongmin Liu Shuang Zhang Xixiang Zhang Jiaguang Han Weili Zhang Center for Terahertz Waves College of Precision Instrument and Optoelectronics Engineering and the Key Laboratory of Optoelectronics Information and Technology (Ministry of Education) Tianjin University Tianjin 300072 China. Department of Mechanical and Industrial Engineering Northeastern University Boston MA 02115 USA. School of Physics and Astronomy University of Birmingham Birmingham B15 2TT UK. Division of Physical Science and Engineering King Abdullah University of Science and Technology Thuwal 23955-6900 Saudi Arabia. School of Electrical and Computer Engineering Oklahoma State University Stillwater OK 74078 USA.

Control over surface plasmons (SPs) is essential in a variety of cutting-edge applications, such as highly integrated photonic signal processing systems, deep-subwavelength lasing, high-resolution imaging, and ultrasensitive biomedical detection. Recently, asymmetric excitation of SPs has attracted enormous interest. In free space, the analog of electromagnetically induced transparency (EIT) in metamaterials has been widely investigated to uniquely manipulate the electromagnetic waves. In the near field, we show that the dark mode coupling mechanism of the classical EIT effect enables an exotic and straightforward excitation of SPs in a metasurface system. This leads to not only resonant excitation of asymmetric SPs but also controllable exotic SP focusing by the use of the Huygens-Fresnel principle. Our experimental findings manifest the potential of developing plasmonic metadevices with unique functionalities.

关键词： Surface plasmons asymmetric excitation coupling dark mode near field terahertz

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Joint User Scheduling and Antenna Selection in Distributed Massive MIMO systems with Limited Backhaul Capacity

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China Communications 2014年第5期11卷 17-30页

作者： XU Guozhen LIU An JIANG Wei XIANG Haige LUO Wu The State Key Laboratory of Advanced Optical Communication Systems and Networks Peking University China Department of Electrical and Computer Engineering Hong Kong University of Science and Technology Hong Kong China

Massive MIMO systems offer a high spatial resolution that can drastically increase the spectral and/or energy efficiency by employing a large number of antennas at the base station(BS).In a distributed massive MIMO system,the capacity of fiber backhaul that links base station and remote radio heads is usually limited,which becomes a bottleneck for realizing the potential performance gain of both downlink and *** solve this problem,we propose a joint antenna selection and user scheduling which is able to achieve a large portion of the potential gain provided by the massive MIMO array with only limited backhaul *** sub-optimal iterative algorithms with the objective of sumrate maximization are proposed for the joint optimization of antenna selection and user scheduling,either based on greedy fashion or Frobenius-norm *** and complexity analysis are presented for the *** provided Monte Carlo simulations show that,one of our algorithms achieves a good tradeoff between complexity and performance and thus is especially fit for massive MIMO systems.

关键词： massive MIMO limited backhaul capacity antenna selection user scheduling

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A New Clustering Algorithm with Adaptive Attractor for LIDAR Points

A New Clustering Algorithm with Adaptive Attractor for LIDAR...

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2014 IEEE International Conference on Progress in Informatics and Computing

作者： Min Wei Longyu Zhao Xiaolong Liu State Key Laboratory of Intelligent Technology and Systems Tsinghua National Laboratory for Information Science and Technology Department of Computer Science Tsinghua University Department of Basic Dalian Naval Academy Materials Physics Academy of Materials Science and Engineering Jilin University

Clustering is a semi-supervised or unsupervised algorithm for classifying a set of data according tounderlying characteristics or similarity. There are many different algorithms for different applications. Each algorithm has its advantages tosome special fields. As tothe data obtained from an automotive LUX- LIDAR, the existing algorithms are failed tocluster them accurately or efficiently. Itis because that the distances between points are non-uniform and the number of objects is unknown and the object's shape and size are arbitrary. Then, we propose a new clustering algorithm for this kind of LIDAR's sparse data. In the algorithm we introduce a variant described as adaptive attractor. The adaptive attractor is determined by the datasetitself. It determines which class the point belongs to. Compared tothe existing clustering algorithm, the advantage of the algorithm lies in the following:i) itis able toclassify object with arbitrarily shape and size;ii) the object's number in the ROI is unknown;iii) similarities between data features of different objects are not fixed;iv) its time complexity is low;v) itis simple.

关键词： unsupervised classifier clustering sparse data adaptive attractor LIDAR

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