ppxscal/embedding_network huggingface dataset:
Omnidirectional Image Stabilization by Computing Camera Trajectory
Authors: Akihiko Torii, Michal Havlena, Tomáš Pajdla
Venue: Proceedings of the 3rd Pacific Rim Symposium on Advances in Image and Video Technology (2009)

In this paper we present a pipeline for camera pose and trajectory estimation, and image stabilization and rectification for dense as well as wide baseline omnidirectional images. The input is a set of images taken by a single hand-held camera. The output is a set of stabilized and rectified images augmented by the computed camera 3D trajectory and reconstruction of feature points facilitating visual object recognition. The paper generalizes previous works on camera trajectory estimation done on perspective images to omnidirectional images and introduces a new technique for omnidirectional image rectification that is suited for recognizing people and cars in images. The performance of the pipeline is demonstrated on a real image sequence acquired in urban as well as natural environments.
Massive action control system
Authors: Katsutoki Hamana, Atsushi Nakano, Junichi Hoshino
Venue: ACM SIGGRAPH ASIA 2008 artgallery: emerging technologies (2008)

Massive Action Control System concurrently controls thousands of actions of multiple characters with various motivations, feelings, and personalities.
A discontinuous enrichment method for the finite element solution of high Péclet advection-diffusion problems
Authors: Irina Kalashnikova, Charbel Farhat, Radek Tezaur
Venue: Finite Elements in Analysis and Design (2009)

A discontinuous enrichment method (DEM) for the efficient finite element solution of the two-dimensional advection-diffusion equation is presented. Following the general DEM, the standard Galerkin polynomial field is locally enriched with free-space solutions of the homogeneous and constant-coefficient version of the governing partial differential equation. For the advection-diffusion equation, the free-space solutions are exponential functions that exhibit a steep gradient in the advection direction. The continuity of the solution across the element boundaries is weakly enforced by a carefully discretized Lagrange multiplier field. Preliminary results for previously published benchmark problems reveal that the DEM elements proposed in this paper are significantly more competitive than their Galerkin and stabilized Galerkin counterparts, especially in advection-dominated (high Peclet number) flows. Whereas spurious oscillations are known to pollute the standard Galerkin solution unless a very fine mesh is used, the DEM solution is shown to deliver an impressive accuracy at low mesh resolution.
Wavelet-Based Speech Enhancement Using Time-Adapted Noise Estimation
Authors: Sheau-Fang Lei, Ying-Kai Tung
Venue: IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences (2008)

Spectral subtraction is commonly used for speech enhancement in a single channel system because of the simplicity of its implementation. However, this algorithm introduces perceptually musical noise while suppressing the background noise. We propose a wavelet-based approach in this paper for suppressing the background noise for speech enhancement in a single channel system. The wavelet packet transform, which emulates the human auditory system, is used to decompose the noisy signal into critical bands. Wavelet thresholding is then temporally adjusted with the noise power by time-adapted noise estimation. The proposed algorithm can efficiently suppress the noise while reducing speech distortion. Experimental results, including several objective measurements, show that the proposed wavelet-based algorithm outperforms spectral subtraction and other wavelet-based denoising approaches for speech enhancement for nonstationary noise environments.
Finite sample multivariate tests of asset pricing models with coskewness
Authors: Marie-Claude Beaulieu, Jean-Marie Dufour, Lynda Khalaf
Venue: Computational Statistics Data Analysis (2009)

Exact inference methods are proposed for asset pricing models with unobservable risk-free rates and coskewness; specifically, the Quadratic Market Model (QMM) which incorporates the effect of asymmetry of return distribution on asset valuation. In this context, exact tests are appealing given (i) the increasing popularity of such models in finance, (ii) the fact that traditional market models (which assume that asset returns move proportionally to the market) have not fared well in empirical tests, (iii) finite sample QMM tests are unavailable even with Gaussian errors. Empirical models are considered where the procedure to assess the significance of coskewness preference is LR-based, and relates to the statistical and econometric literature on dimensionality tests which are interesting in their own right. Exact versions of these tests are obtained, allowing for non-normality of fundamentals. A simulation study documents the size and power properties of asymptotic and finite sample tests. Empirical results with well-known data sets reveal temporal instabilities over the full sampling period, namely 1961-2000, though tests fail to reject the QMM restrictions over 5-year sub-periods.
Transparent Process Monitoring in a Virtual Environment
Authors: Fabrizio Baiardi, Dario Maggiari, Daniele Sgandurra, Francesco Tamberi
Venue: Electronic Notes in Theoretical Computer Science (ENTCS) (2009)

PsycoTrace is a system that integrates static and dynamic tools to protect a process from attacks that alter the process self as specified by the program source code. The static tools build a context-free grammar that describes the sequences of system calls the process may issue and a set of assertions on the process state, one for each invocation. The dynamic tools parse the call trace of the process to check that it belongs to the grammar language and evaluate the assertions. This paper describes the architecture of PsycoTrace, which exploits virtualization to introduce two virtual machines, the monitored and the monitoring virtual machines, to increase both the robustness and the transparency of the monitoring because the machine that implements all the checks is strongly separated from the monitored one. We discuss the modification to the kernel of the monitored machine to trace system call invocations, the definition of the legal traces and the checks to prove the trace is valid. We describe how PsycoTrace applies introspection to evaluate the assertions and analyze the state of the monitored machine and of its data structures. Finally, we present the security and performance results of the dynamic tools, and the implementation of the static tools.
Computing with Curvelets: From Image Processing to Turbulent Flows
Authors: Jianwei Ma, Gerlind Plonka
Venue: Computing in Science and Engineering (2009)

The curvelet transform allows an almost optimal nonadaptive sparse representation for curve-like features and edges. The authors describe some recent applications involving image processing, seismic data exploration, turbulent flows, and compressed sensing.
Critical methods and user generated content: the iPhone on YouTube
Authors: Mark Blythe, Paul Cairns
Venue: Proceedings of the 27th international conference on Human factors in computing systems (2009)

Sites like YouTube offer vast sources of data for studies of human computer interaction. However, they also present a number of methodological challenges. This paper offers an example study of the initial reception of the iPhone 3G through YouTube. It begins with a quantitative account of the overall shape of the most frequently viewed returns for an iPhone 3G" search. A content analysis of the first hundred videos then explores the returns categorized by genre. Comments on the most popular video "Will It Blend"are analysed using grounded theory. It is argued that social science methods are not sufficient for a rich understanding of such material. The paper concludes with an analysis of"Will it Blend"that draws on cultural and critical theory. It is argued that a multi-methodological approach is necessary to exploit such data and also to address the challenges of next generation Human Computer Interaction (HCI).
A toolkit approach to sketched diagram recognition
Authors: Beryl Plimmer, Isaac Freeman
Venue: Proceedings of the 21st British CHI Group Annual Conference on HCI 2007: People and Computers XXI: HCI...but not as we know it - Volume 1 (2007)

Sketch-based tools provide a more human centered design environment than traditional widget-based computer design software. A number of sketch tools exist that support specific design tasks: however wider exploration of computer supported sketching is being hampered by the effort required to build the sketching software. Here we present a sketch tool framework, its implementation and evaluation. The implementation, InkKit, provides context free design spaces and a powerful, trainable and extensible modeless writing/drawing recognition engine. It reduces the development effort for a specific diagram type from thousands of lines of code to a few hundred. We evaluated our toolkit by asking fourth year computer science students to use InkKit to develop a diagram specific recognizer.
SOARI: A Service Oriented Architecture to Support Agent Reputation Models Interoperability
Authors: Luis G. Nardin, Anarosa A. Brandão, Jaime S. Sichman, Laurent Vercouter
Venue: Trust in Agent Societies: 11th International Workshop, TRUST 2008, Estoril, Portugal, May 12 -13, 2008. Revised Selected and Invited Papers (2008)

Interaction among agents about reputation is essential to accelerate the convergence of the reputation evaluation. Semantic heterogeneity of different reputation models makes agent interaction a problem, especially in open MAS. We propose in this paper a service oriented architecture, SOARI, to deal with this problem. Namely, SOARI is composed of an external Ontology Mapping Service (OMS) and an agent internal Translator module. This architecture supports concept mapping and translation among reputation model ontologies to a common ontology and vice-versa, thus allowing heterogeneous agents to interoperate about reputation. We present an example of the OMS's use, by showing the mapping of two reputation models to a common ontology. Finally, we illustrate the use of the whole SOARI architecture in a simplified electronic commerce scenario. These experiments have enabled us to analyze the limitations and advantages of a hybrid approach for heterogeneous agents interoperation.
Effects of Different Mobile Channel Conditions on IEEE 802.20
Authors: Ashkan Jalili, Rasoul Yousefi, S. Mehdi Fakhraie, Said Nader-Esfahani
Venue: Proceedings of the 2009 International Conference on Computer Engineering and Technology - Volume 02 (2009)

With the development of wireless and mobile Internet technology, people in everyday life and business hope for access to the Internet even while they are in movement. IEEE 802.20 technology is mobile and can effectively address high-speed network access. In this paper the PHY layer model for simulating 802.20 in SIMULINK and subsystems in MATLAB S-function files are presented. To evaluate the performance of the proposed system implementation, the mobile channel models have been developed and the system is tested in different channel conditions, whereas different modulation schemes supported in this standard are analyzed. Bit Error Rate (BER) versus Signal to Noise Ratio (SNR) curves are used for comparing the results.
A Glimpse into the Apadam-Constraint in the Tradition of Sanskrit Grammar
Authors: Prasad P. Joshi
Venue: Sanskrit Computational Linguistics: First and Second International Symposia Rocquencourt, France, October 29-31, 2007 Providence, RI, USA, May 15-17, 2008 Revised Selected and Invited Papers (2009)

The tradition of Sanskrit Grammar has put a constraint: apadaṁ na prayu&ntilde; jīta (non-inflected form should not be used in the sentence). The present paper is an attempt to discuss its salient features, while showing its assumption in Pānini's model and comparing it with the contemporary theory. A form which is suffixed with sup and tin is termed as pada by Pānini. Every lexical item is tagged as dhātu or prātipadika in his system and subsequently affixed with the inflections and thus is furnished as a pada, fit to enter into a sentence. It seems that the apadam-constraint is an effective tool to eliminate the ill formed sequences from the well formed sentences thus contributing to the generative theory. The case filter principle of the modern universal case theory, with some difference, bears striking similarities with the present constraint. It reads: every overt NP must be assigned abstract case. However, although very effective, it is concerned with NPs alone. The apadam-constraint, although language specific, has a wider application being concerned with both NP and VP.
Arbitrage Opportunities and Market-Making Traders in Prediction Markets
Authors: Stefan Luckner, Christof Weinhardt
Venue: Proceedings of the 2008 10th IEEE Conference on E-Commerce Technology and the Fifth IEEE Conference on Enterprise Computing, E-Commerce and E-Services (2008)

Prediction markets are a promising approach for predicting uncertain future events and developments. These markets will work well if they are efficient and in efficient markets, one does not expect arbitrage opportunities to be persistent. This paper therefore studies whether pure arbitrage opportunities existed in a sports prediction market. Moreover, market liquidity can become an issue in prediction markets since new information is potentially not immediately reflected in trading prices and traders might also lose interest in the markets if they are illiquid. This paper therefore analyzes whether traders try to exploit illiquidity by taking on the role of market makers in prediction markets. Our analysis of a sports prediction market for the FIFA World Cup 2006 shows that prediction markets also appear to be efficient in the sense that there are few substantial arbitrage opportunities available. Furthermore, we find that market markers play an important role in prediction markets. They serve as liquidity providers and allow for continuous trading.
SSB Modulation of the Ultrasonic Carrier for a Parametric Loudspeaker
Authors: Youxiang Wang, Xuesheng Li, Limei Xu, Leon Xu
Venue: Proceedings of the 2009 International Conference on Electronic Computer Technology (2009)

The parametric loudspeaker takes advantage of the non-linearity property of the air to create new frequency sound components, which can be used to reproduce audible sound from the ultrasonic waves generated by the transducer. Compared with the traditional loudspeaker, the audible sound from the transducer of the parametric loudspeaker has very sharp directivity pattern, which makes its possible to create a sound beam. The problem is also from the non-linearity interaction, which brings great harmonic distortion to the audible sound. As a result of that, many signal processing methods have been proposed to reduce THD (total harmonic distortion), including square-rooter method, DSB (double sideband) modulation, and SSB (single sideband) modulation etc. In this paper, the SSB modulation used in parametric loudspeaker has been analyzed in detail and its testing results are also included, which show that SSB modulation has great advantage over the other processing methods.
A Unified Hierarchical Appearance Model for People Re-identification Using Multi-view Vision Sensors
Authors: Jau-Hong Kao, Chih-Yang Lin, Wen-How Wang, Yi-Ta Wu
Venue: Proceedings of the 9th Pacific Rim Conference on Multimedia: Advances in Multimedia Information Processing (2008)

Surveillance of wide areas requires a system of multiple cameras to keep observing people. In such a multiple view system, the people appearance obtained in one camera is usually different from the ones obtained in other cameras. In order to correctly identify people, the unique appearance model of each specific object should be invariant to such changes. In this paper, our appearance model is represented by a hierarchical structure where each node maintains a color Gaussian mixture model (GMM). The re-identification is performed with Bayesian decision. Experimental results show our unified appearance model is robust to rotation and scaling variations. Furthermore, it achieves high accuracy rate (92.7% in average) and high processing performance (above 30 FPS) without tracking mechanism.
A Combination of Adaptive Equalizer and LMS-RAKE Combining Scheme for DS-UWB System
Authors: Keat Beng Toh, Shin'ichi Tachikawa
Venue: IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences (2008)

This paper proposes a combination of adaptive equalizer and Least Mean Square-RAKE (LMS-RAKE) combining scheme receiver system for Direct Sequence-Ultra Wideband (DS-UWB) multipath channel model. The main purpose of the proposed system is to overcome the performance degradation for UWB transmission due to the occurrence of Inter-Symbol Interference (ISI) during high speed transmission of ultra short pulses in a multipath channel. The proposed system improves the system performance by mitigating the multipath effect using LMS-RAKE receiver and suppressing the ISI effect with the adaptive equalizer. Simulation results verify that significant equalization gain can be obtained by the proposed system especially in UWB multipath channel models such as channel CM3 and channel CM4 that suffered severe ISI effect.
Many-to-Many Disjoint Path Covers in the Presence of Faulty Elements
Authors: Jung-Heum Park, Hee-Chul Kim, Hyeong-Seok Lim
Venue: IEEE Transactions on Computers (2009)

A many-to-many k-disjoint path cover (k-DPC) of a graph G is a set of k disjoint paths joining k sources and k sinks in which each vertex of G is covered by a path. It is called a paired many-to-many disjoint path cover when each source should be joined to a specific sink, and it is called an unpaired many-to-many disjoint path cover when each source can be joined to an arbitrary sink. In this paper, we discuss about paired and unpaired many-to-many disjoint path covers including their relationships, application to strong Hamiltonicity, and necessary conditions. And then, we give a construction scheme for paired many-to-many disjoint path covers in the graph H_{0} \oplus H_{1} obtained from connecting two graphs H_{0} and H_{1} with |V(H_{0})| = |V(H_{1})| by |V(H_{0})| pairwise nonadjacent edges joining vertices in H_{0} and vertices in H_{1}, where H_{0} = G_{0} \oplus G_{1} and H_{1} = G_{2} \oplus G_{3} for some graphs G_{j}. Using the construction, we show that every m-dimensional restricted HL-graph and recursive circulant G(2^{m}, 4) with f or less faulty elements have a paired k-DPC for any f and k \geq 2 with f + 2k \leq m.
An ontological approach to designers' idea explanation style: Towards supporting the sharing of kansei-ideas in textile design
Authors: T. Ogawa, Y. Nagai, M. Ikeda
Venue: Advanced Engineering Informatics (2009)

In human-centered design activities, each designer has his or her own ideas about emotional aspect (or kansei) of new products. It is a key issue to share this vague kansei-idea appropriately at the earliest stage of design activities. This paper shows a novel ontological engineering approach to support kansei-idea sharing. The approach focuses on an idea explanation style as the wisdom of the design team. Ontological engineering has been making contributions to systematize knowledge and vocabulary by modeling them. Needless to say, it is difficult to model the vague kansei-idea itself. However, if the modeled object is shifted from the kansei-idea to the kansei-idea explanation style, it can provide the benefit of modeling. We investigated the effectiveness of the ontological engineering approach, and concluded that to construct an ontological framework of designers' explanations is especially useful regarding these points: clarification of the essence of the explanation style, discovery of problems in explanations, and analyzing difficulties in acquiring explanation style for novices. From the investigation, what we can support and how a support system should be designed became clear. Furthermore, we built a kansei-idea sharing support system, and obtained the results of its initial trials.
Rotating field voltage analysis on the stator and rotor of the inverted rotor induction motor
Authors: Ismail Temiz, Caner Akuner, Yasar Birbir, Adnan Kakilli
Venue: Proceedings of the 6th conference on Applications of electrical engineering (2007)

Most of the induction motors are of the rotary type with basically a stationary stator and rotating rotor. In this study, an inverted rotor induction motor is designed and produced. This motor has mechanical revolving characteristics both rotor and stator. In this type of construction the rotor has three-phase winding as well, similar to the stator wound for the same number of poles as the stator winding. The wound-rotor winding terminates in slip rings mounted on the rotor shaft. Brushes ride on the slip rings. Also measurement coils are placed upper of the same slots of the stator and rotor windings of the inverted rotor induction motor. Regardless of the rotor construction employed, rotor currents in this motor are induced by the stator's changing, or rather, rotating, and magnetic fields. This induction action is the central operating principle of ac induction motors. Waveforms of the induced voltages on the rotor and stator windings are investigated. Rotating magnetic fields of the rotor and stator are measured by using these measurement coils. Experimental data have been evaluated at rotation fields of the rotor and stator by using measurement coils.
Emission of Nanosize Particles in the Process of Nanoclay Blending
Authors: Elzbieta Jankowska, Wojciech Zatorski
Venue: Proceedings of the 2009 Third International Conference on Quantum, Nano and Micro Technologies (2009)

Blending is one of the dustiest operations in the process of developing new fire-safe polyurethane foams. This paper presents the results of an investigation of the emission of nanosize particles released Nanofil®5 nanoclay is blended. Ten 5–20 g samples of Nanofil®5 were blended for 30–204 s. The level of nanosize particles was monitored continuously over 3 days with a scanning mobility particle sizer (SMPS) with a long differential mobility analyser (DMA) to measure particle number size distributions in the 17–604 nm range and a P-TRAK ultrafine particle counter (UPC) to measure particle number concentrations in the 20–1000 nm range. The results showed that blending released 17–34 nm particles. The total number concentrations from the SMPS were compared with those from the P-TRAK; similar results were obtained.
Understanding the use of video games in non-formal education in Barcelona
Authors: Daniel Aranda, Jordi Sánchez-Navarro
Venue: Proceedings of the 2008 International Conference on Advances in Computer Entertainment Technology (2008)

Video games, as with any other cultural resource, are basic tools in social and cultural learning, tools for socialising that provide players with instrumental and social competences and skills. We have just completed a pilot project entitled ELLAD, (Esplai de Lleure i Aprenentatge Digital - Digital Learning and non-formal education classroom), looking at the use of video games in non-formal educational contexts as a tool to improve the quality and effectiveness of their education practices and processes. In this paper, we summarise the factors that led to the creation of the video games classroom in the context of non-formal education, the dynamics established, the initial conclusions reached and the further research related to this pilot project: the forthcoming study "Rethinking Digital Entertainment: a project on young people's digital socialization in spare time", funded by the Spanish Ministry of Industry, that will be developed between 2009 and 2011.