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On the complexity of package recommendation problems 12

On the complexity of package recommendation problems

引用

31st ACM SIGMOD-SIGACT-SIGART Symposium on Principles of Database Systems, PODS '12

作者： Deng, Ting Fan, Wenfei Geerts, Floris School of Computer Science and Engineering Beihang University Beijing China Lab. for Foundations of Computer Science School of Informatics University of Edinburgh Edinburgh United Kingdom Dept. of Mathematics and Computer Science University of Antwerp Antwerp Belgium

ISBN: (纸本)9781450312486

Recommendation systems aim to recommend items that are likely to be of interest to users. This paper investigates several issues fundamental to such systems. (1) We model recommendation systems for packages of items. We use queries to specify multi-criteria for item selections and express compatibility constraints on items in a package, and use functions to compute the cost and usefulness of items to a user. (2) We study recommendations of points of interest, to suggest top-k packages. We also investigate recommendations of top-k items, as a special case. In addition, when sensible suggestions cannot be found, we propose query relaxation recommendations to help users revise their selection criteria, or adjustment recommendations to guide vendors to modify their item collections. (3) We identify several problems, to decide whether a set of packages makes a top-k recommendation, whether a rating bound is maximum for selecting top-k packages, whether we can relax the selection query to find packages that users want, and whether we can update a bounded number of items such that the users' requirements can be satisfied. We also study function problems for computing top-k packages, and counting problems to find how many packages meet the user's criteria. (4) We establish the upper and lower bounds of these problems, all matching, for combined and data complexity. These results reveal the impact of variable sizes of packages, the presence of compatibility constraints, as well as a variety of query languages for specifying selection criteria and compatibility constraints, on the analyses of these problems. © 2012 ACM.

关键词： Recommender systems

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Complex support vector regression

Complex support vector regression

引用

2012 3rd International Workshop on Cognitive Information Processing, CIP 2012

作者： Bouboulis, Pantelis Theodoridis, Sergios Mavroforakis, Charalampos Department of Informatics and Telecommunications University of Athens Athens 157 84 Greece Department of Computer Science Data Management Lab. Boston University Boston MA 02215 United States

ISBN: (纸本)9781467318785

We present a support vector regression (SVR) rationale for treating complex data, exploiting the notions of widely linear estimation and pure complex kernels. To compute the Lagrangian and derive the dual problem, we employ the recently presented Wirtinger's calculus on complex RKHS. We prove that this approach is equivalent with solving two real SVR problems exploiting a specific real kernel, which it is induced by the chosen complex kernel. © 2012 IEEE.

关键词： Calculations

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Can modified casual speech reach the intelligibility of clear speech?

Can modified casual speech reach the intelligibility of clea...

引用

13th Annual Conference of the International-Speech-Communication-Association

作者： Koutsogiannaki, M. Pettinato, M. Mayo, C. Kandia, V. Stylianou, Y. Institute of Computer Science FORTH Multimedia Informatics Lab. UoC Greece Speech Hearing and Phonetic Sciences University College London United Kingdom Centre for Speech Technology Research University of Edinburgh United Kingdom

ISBN: (纸本)9781622767595

Clear speech is a speaking style adopted by speakers in an attempt to maximize the clarity of their speech and is proven to be more intelligible than casual speech. This work focuses on modifying casual speech to sound as intelligible as clear speech. First, we examine the role of speaking rate for intelligibility. Clear and casual speech signals are time-scale stretched, matching the average duration of the casual and clear speech respectively. Next, spectral shaping and dynamic range compression are considered for increasing the loudness of the original casual speech while keeping the power of signals unaffected. Subjective tests with speech-in-noise conditions using speech shaped noise at -3, 0, and 5 dB SNR show that clear speech with high speaking rate is less intelligible than the original clear speech but still more intelligible than the unmodified casual speech. However, the intelligibility score for the time-scaled modified casual speech is deteriorated. In contrast, the loudness amplification considerably improved the intelligibility of the casual speech, reaching the scores of original clear speech. Objective measurements based on Speech Intelligibility Index (SE) are well correlated with the subjective test except for the time-scaled casual signal.

关键词： Clear speech Casual speech Speech intelligibility Spectral modifications

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The deletion operation in xBR-trees

The deletion operation in xBR-trees

引用

2012 16th Panhellenic Conference on informatics, PCI 2012

作者： Roumelis, George Vassilakopoulos, Michael Corral, Antonio Information Processing and Management Lab. Dept. of Computer Science and Biomedical Informatics University of Central Greece Lamia Greece Dept. of Languages and Computing University of Almeria Almeria Spain

ISBN: (纸本)9780769548258

In order to design a spatial index, the most important operations are: insertion, deletion and search. We focus on the deletion operation over the xBR-tree, a spatial data secondary memory structure that belongs to the Quad tree family. The algorithm of handling deletions is presented, taking into account that the deletion of a leaf item may cause entries deletions from internal nodes. The well-known merging technique is applied, to retain the efficiency of the xBR-tree. © 2012 IEEE.

关键词： Trees (mathematics)

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Virtual projection: Exploring optical projection as a metaphor for multi-device interaction 12

Virtual projection: Exploring optical projection as a metaph...

引用

30th ACM Conference on Human Factors in Computing Systems, CHI 2012

作者： Baur, Dominikus Boring, Sebastian Feiner, Steven Media Informatics Group University of Munich Munich Germany Interactions Lab. University of Calgary Calgary AB Canada Department of Computer Science Columbia University New York NY United States

ISBN: (纸本)9781450310154

Handheld optical projectors provide a simple way to overcome the limited screen real-estate on mobile devices. We present virtual projection (VP), an interaction metaphor inspired by how we intuitively control the position, size, and orientation of a handheld optical projector's image. VP is based on tracking a handheld device without an optical projector and allows selecting a target display on which to position, scale, and orient an item in a single gesture. By relaxing the optical projection metaphor, we can deviate from modeling perspective projection, for example, to constrain scale or orientation, create multiple copies, or offset the image. VP also supports dynamic filtering based on the projection frustum, creating overview and detail applications, and selecting portions of a larger display for zooming and panning. We show exemplary use cases implemented using our optical feature-tracking framework and present the results of a user study demonstrating the effectiveness of VP in complex interactions with large displays. Copyright 2012 ACM.

关键词： Optical projectors

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Privacy issues in social networks: A brief survey

Privacy issues in social networks: A brief survey

引用

14th International Conference on Information Processing and Management of Uncertainty in Knowledge-Based Systems, IPMU 2012

作者： Díaz, Irene Ralescu, Anca University of Oviedo Department of Computer Science E-33204 Oviedo Spain University of Cincinnati School of Computing Sciences and Informatics Machine Learning and Computational Intelligence Lab. Cincinnati OH 45221-0008 United States

ISBN: (纸本)9783642317231

Most social networks allow individuals to share their information with friends but also with unknown people. Therefore, in order to prevent unauthorized access to sensitive, private information, the study of privacy issues in social networks has become an important task. This paper provides a brief overview of the emerging research in privacy issues in social networks. © 2012 Springer-Verlag.

关键词： Data mining

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Investigating bias in traditional media through social media

Investigating bias in traditional media through social media

引用

21st Annual Conference on World Wide Web, WWW'12

作者： Younus, Arjumand Qureshi, M. Atif Kingrani, Suneel Kumar Saeed, Muhammad Touheed, Nasir O'Riordan, Colm Gabriella, Pasi Computational Intelligence Research Group Information Technology National University of Ireland Galway Ireland Information Retrieval Lab. Informatics Systems and Communication University of Milan Bicocca Milan Italy Web Science Research Group Faculty of Computer Science Institute of Business Administration Karachi Pakistan

ISBN: (纸本)9781450312301

It is often the case that traditional media provide coverage of a news event on the basis of journalists' viewpoints - a problem termed in the literature as media bias. On the other hand social media have given birth to an alternative paradigm of journalism known as "citizen journalism". We take advantage of citizen journalism to detect the bias in traditional media and propose a simple model for empirical measurement of media bias. Copyright is held by the author/owner(s).

关键词： Social networking (online)

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A shape enhancement technique based on multi-channel salience measure

A shape enhancement technique based on multi-channel salienc...

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1st International Conference on Computational Visual Media, CVM 2012

作者： Miao, Yongwei Feng, Jieqing Wang, Jinrong Pajarola, Renato College of Computer Science and Technology Zhejiang University of Technology Hangzhou 310023 China State Key Lab. of CAD and CG Zhejiang University Hangzhou 310027 China Department of Informatics University of Zürich Zürich CH-8050 Switzerland

ISBN: (纸本)9783642342622

In this paper, we develop a novel visual saliency based shape enhancement technique for relief surfaces. It consists of three steps. Firstly, we calculate the multi-channel salience map of the underlying shape by combining three feature maps, i.e., the feature map of local height distribution, normal difference, and mean curvature variation. Secondly, we manipulate the original relief surface by a salience-domain shape manipulation function. Finally, we adjust surface normals of the original shape as the corresponding final normals of the manipulated surface. The experimental results show that our proposed algorithm can adjust the shading of the original shape and thus for improving its shape depiction. © 2012 Springer-Verlag.

关键词： computers

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Algebraic analysis of the computation in the Belousov-Zhabotinksy reaction

引用

9th International Conference on Information Processing in Cells and Tissues, IPCAT 2012

作者： Dini, Paolo Nehaniv, Chrystopher L. Egri-Nagy, Attila Schilstra, Maria J. Royal Society Wolfson BioComputation Research Lab. Centre for Computer Science and Informatics Research University of Hertfordshire United Kingdom Department of Media and Communications London School of Economics and Political Science London United Kingdom School of Computing and Mathematics University of Western Sydney Parramatta NSW Australia

ISBN: (纸本)9783642287916

We analyse two very simple Petri nets inspired by the Oregonator model of the Belousov-Zhabotinsky reaction using our stochastic Petri net simulator. We then perform the Krohn-Rhodes holonomy decomposition of the automata derived from the Petri nets. The simplest case shows that the automaton can be expressed as a cascade of permutation-reset cyclic groups, with only 2 out of the 12 levels having only trivial permutations. The second case leads to a 35-level decomposition with 5 different simple non-abelian groups (SNAGs), the largest of which is A 9. Although the precise computational significance of these algebraic structures is not clear, the results suggest a correspondence between simple oscillations and cyclic groups, and the presence of SNAGs indicates that even extremely simple chemical systems may contain functionally complete algebras. © 2012 Springer-Verlag.

关键词： Petri nets

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Learning sentiments from tweets with personal health information

引用

25th Canadian Conference on Artificial Intelligence, AI 2012

作者： Bobicev, Victoria Sokolova, Marina Jafer, Yasser Schramm, David Department of Applied Informatics Technical University of Moldova Moldova Electronic Health Information Lab. CHEO Research Institute Canada School of Electrical Engineering and Computer Science University of Ottawa Ottawa ON Canada Faculty of Medicine University of Ottawa Ottawa ON Canada Children's Hospital of Eastern Ontario Canada

ISBN: (纸本)9783642303524

We present results of sentiment analysis in Twitter messages that disclose personal health information. In these messages (tweets), users discuss ailment, treatment, medications, etc. We use the author-centric annotation model to lab.l tweets as positive sentiments, negative sentiments or neutral. The results of the agreement among three raters are reported and discussed. We then use Machine Learning methods on multi-class and binary classification of sentiments. The obtained results are comparable with previous results in the subjectivity analysis of user-written Web content. © 2012 Springer-Verlag.

关键词： Sentiment analysis

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