ppxscal/embedding_network huggingface dataset:
A pilot-based fast algorithm for joint estimation of frequency offset and channel in OFDM
Authors: Yonghong Zeng, A. Rahim Leyman
Venue: Signal Processing (2006)

Efficient estimations of the carrier frequency offset (CFO) and channel are vital to orthogonal frequency division multiplexing (OFDM). In this paper, a new fast algorithm is proposed for estimating the CFO based on the pilot structure in [M. Morelli, U. Mengali, An improved frequency offset estimator for OFDM applications, IEEE Commun. Lett. 3(3) (1999) 75-77; H.K. Song, Y.H. You, J.H. Paik, Y.S. Cho, Frequency-offset synchronization and channel estimation for OFDM-based transmission, IEEE Commun. Lett. 4(3) (2000) 95-97]. The new method first identifies a coarse estimation of the CFO and then refines it by a least square (LS) method. It always gives a more accurate estimation than the multi-stage method in [H.K. Song, Y.H. You, J.H. Paik, Y.S. Cho, Frequency-offset synchronization and channel estimation for OFDM-based transmission, IEEE Commun. Lett. 4(3) (2000) 95-97] and is better than the method in [M. Morelli, U. Mengali, An improved frequency offset estimator for OFDM applications, IEEE Commun. Lett. 3(3) (1999) 75-77] at low SNR. It only slightly worse than the maximum likelihood estimator at high SNR. Furthermore, the proposed method can be used for CFO tracking. Also, in this paper, channel estimation by using the same pilot block is considered. The best values for the non-null subcarriers are found to optimize the channel estimation and peak to average power ratio (PAPR) simultaneously. Simulations demonstrate that the proposed methods are effective.
An SDS modeling approach for simulation-based control
Authors: Sreeram Ramakrishnan, Mayur Thakur
Venue: Proceedings of the 37th conference on Winter simulation (2005)

We initiate a study of mathematical models for specifying (discrete) simulation-based control systems. It is desirable to specify simulation-based control systems using a model that is intuitive, succinct, expressive, and whose state space properties are relatively easy computationally. We compare automata-based models for specifying control systems and find that all systems that are currently used (such as finite state machines, communicating hierarchical finite state machines (FSM), communicating finite state machines, and Turing machines) lack at least one of the abovementioned features. We propose using sequential dynamical systems (SDS)---a formalism for representing discrete simulations---to specify simulation-based control systems. We show how to adapt the standard SDS model to specify cell-level controllers for a generic cell. For reasonable flexible manufacturing cells, the SDS-based specification has size polynomial in the size of the cell, while in the worst case the FSM-based specification has size exponential in the size of the cell.
A Pragmatic Protocol for Database Replication in Interconnected Clusters
Authors: J. Grov, L. Soares, A. Jr. Correia, J. Pereira, R. Oliveira, F. Pedone
Venue: Proceedings of the 12th Pacific Rim International Symposium on Dependable Computing (2006)

Multi-master update everywhere database replication, as achieved by protocols based on group communication such as DBSM and Postgres-R, addresses both performance and availability. By scaling it to wide area networks, one could save costly bandwidth and avoid large round-trips to a distant master server. Also, by ensuring that updates are safely stored at a remote site within transaction boundaries, disaster recovery is guaranteed. Unfortunately, scaling existing cluster based replication protocols is troublesome. In this paper we present a database replication protocol based on group communication that targets interconnected clusters. In contrast with previous proposals, it uses a separate multicast group for each cluster and thus does not impose any additional requirements on group communication, easing implementation and deployment in a real setting. Nonetheless, the protocol ensures one-copy equivalence while allowing all sites to execute update transactions. Experimental evaluation using the workload of the industry standard TPC-C benchmark confirms the advantages of the approach.
Building Learning Networks for Lifelong Learners: Challenges, Models, Technologies and Standards
Authors: Rob Koper
Venue: Proceedings of the Sixth IEEE International Conference on Advanced Learning Technologies (2006)

In this tutorial five key problems are discussed that occur in the area of lifelong learning. For each problem we will look at the possible technological solutions. The five problems are: 1) How do we support formal and informal learning from a lifelong learning perspective? 2) How to get an overview of the possible formal and informal learning opportunities that fits a persons needs and competences?3) How do we access the competences of persons to keep track of what there capabilities are? 4) How can we support lifelong learners in performing their various tasks? 5) How can we support the active sharing of knowledge and learning resources?
Project Replayer with Email Analysis - Revealing Contexts in Software Development
Authors: Kimiharu Ohkura, Keita Goto, Noriko Hanakawa, Shinji Kawaguchi, Hajimu Iida
Venue: Proceedings of the XIII Asia Pacific Software Engineering Conference (2006)

In many software development projects, people tend to repeat same mistakes due to lack of shared knowledge from past experiences. Generally, it is very difficult to manually find out valuable phenomena from huge data. Invisible context, which cannot be known directly from software documents or formal reports, is an important factor to these difficulties. We propose a new method to find contexts based on analysis to email archives in a project repository. In this method, we first apply natural language processing to extract keywords from email messages. Next, similarities among the messages are calculated based on the extracted keywords, and the messages are classified into clusters according to the similarities. The clustering result can be presented with other information such as code growth graph or schedule charts. This method is implemented as an extension to the Project Replayer, a tool to review past project data. Pilot analysis confirms that a researcher could grasp important contexts of failures in actual projects using the Project Replayer.
CSC: Criticality-Sensitive Coordination
Authors: Pedro Szekely, Marcel Becker, Stephen Fitzpatrick, Gergely Gati, David Hanak, Jing Jin, Gabor Karsai, Rajiv T. Maheswaran, Bob Neches, Craig M. Rogers, Romeo Sanchez, Chris van Buskirk
Venue: Proceedings of the fifth international joint conference on Autonomous agents and multiagent systems (2006)

Our Criticality-Sensitive Coordination (CSC) agents are designed to enhance the performance of a human-team working together in uncertain and dynamic settings by monitoring and adapting their plans as dictated by the evolution of the environment. Such situations model military scenarios such as a coordinated joint operations or enterprise settings such as multiple-project management. Among the many challenges in these situations are the large space of possible states due to uncertainty, the distributed / partial knowledge of current state and plan among the agents and the need to react in a timely manner to events that may not be in the original model. In fact, reaction alone is often insufficient as in environments where success depends on completing sequences of coupled actions, one needs to anticipate future difficulties and enable contingencies to alleviate potential hazards.
Fast Volume Preservation for a Mass-Spring System
Authors: Min Hong, Sunhwa Jung, Min-Hyung Choi, Samuel W. J. Welch
Venue: IEEE Computer Graphics and Applications (2006)

This article presents a new method to model fast volume preservation of a mass-spring system to achieve a realistic and efficient deformable object animation, without using internal volumetric meshing. With this method the simulated behavior is comparable to a finite-element-method-based model at a fraction of the computational cost.
Weighted least-squares design of linear-phase and arbitrary 2-D complex FIR filters
Authors: A. G. Jaffer, W. E. Jones, T. J. Abatzoglou
Venue: Proceedings of the Acoustics, Speech, and Signal Processing, 1995. on International Conference - Volume 02 (1995)

This paper presents the design of 2-D complex FIR filters using the weighted integral least-squares error criterion (WLS). Both the cases of arbitrary magnitude with linear and arbitrary phase specifications are addressed. The solution of the linear phase case is obtained using the complex Lagrange multiplier formulation to incorporate the necessary constraints for linear phase response. This results in a computationally efficient filter design technique requiring the solution of a Hermitian Toeplitz-block-Toeplitz system of linear equations for which fast algorithms are available. Two illustrative filter design examples are also presented.
Consistent Chronostasis Effects across Saccade Categories Imply a Subcortical Efferent Trigger
Authors: Kielan Yarrow, Helen Johnson, Patrick Haggard, John C. Rothwell
Venue: Journal of Cognitive Neuroscience (2004)

Saccadic chronostasis refers to the subjective temporal lengthening of the first visual stimulus perceived after an eye movement, and is most commonly experienced as the ''stopped clock'' illusion. Other temporal illusions arising in the context of movement (e.g., ''intentional binding'') appear to depend upon the volitional nature of the preceding motor act. Here we assess chronostasis across different saccade types, ranging from highly volitional (self-timed saccades, antisaccades) to highly reflexive (peripherally cued saccades, express saccades). Chronostasis was similar in magnitude across all these conditions, despite wide variations in their neural bases. The illusion must therefore be triggered by a ''lowest common denominator'' signal common to all the conditions tested and their respective neural circuits. Specifically, it is suggested that chronostasis is triggered by a low-level signal arising in response to efferent signals generated in the superior colliculus.
Visual8 Corporation: SIMUL8-Planner
Authors: Kim Hindle
Venue: Proceedings of the 37th conference on Winter simulation (2005)

Visual8 Corporation demonstrates SIMUL8-Planner, a finite capacity scheduling system that combines simulation with job sequencing to create feasible work order schedules at the shop-floor level. SIMUL8-Planner has been designed to address a range of planning and scheduling problems and has pre-built simulation components and scheduling rules to create your own application.
Translation discovery using diverse similarity measures
Authors: David Yarowsky
Venue:  (2006)

Automatic translation between natural languages using empirical learning methods is an active research area. Much of the work in this area is concentrated on acquiring models of translation from expensive resources, including large databases containing hundreds of thousands of translated sentences, which are available for only a small number of the language pairs between which one might wish to translate. This dissertation describes the automatic acquisition of translations into English for unknown foreign language words given the lack of any high-quality translation learning resources, which is the reality for nearly all of the world's languages. The methods presented in this dissertation require minimal training supervision; the necessary inputs consist of only a few hundred thousand words of raw news text in a language of interest, such as Uzbek, and a translation dictionary into English for some related language, such as Turkish. We show how diverse measures of cross-language word similarity can be combined to learn translations for a considerable subset of the vocabulary of a language for which no translations are initially known. These similarities include statistical models of related-language cognate words, various cross-language comparisons of how words are used in monolingual text, and the distribution of terms in dated news articles. The ultimate result is a functional translation capability for new language pairs using minimal training resources and almost no human supervision.
NetScale: scalable time-stepped hybrid simulation of large IP networks
Authors: Laurent Fournié, Dohy Hong, Florent Perisse
Venue: ACM SIGCOMM Computer Communication Review (2006)

This paper presents a scalable time-stepped hybrid simulation algorithm which is well adapted to the simulation of large IP networks (up to one million of competing ows and network elements), while tracking reactive traffic behaviour and packet-level phenomena e.g. timeout trigger or packet burstiness. This simulation paradigm allows one to gain several orders of magnitude of computation time compared to traditional discrete event simulation approaches. The accuracy of this simulation method is evaluated by comparison to other simulation methodologies. Examples of large scale network simulations are also presented.
Bisimulation relations for dynamical, control, and hybrid systems
Authors: Esfandiar Haghverdi, Paulo Tabuada, George J. Pappas
Venue: Theoretical Computer Science (2005)

The fundamental notion of bisimulation equivalence for concurrent processes, has escaped the world of continuous, and subsequently, hybrid systems. Inspired by the categorical framework of Joyal, Nielsen and Winskel, we develop novel notions of bisimulation equivalence for dynamical systems as well as control systems. We prove that these notions can be captured by the abstract notion of bisimulation as developed by Joyal, Nielsen and Winskel. This is the first unified notion of system equivalence that transcends discrete and continuous systems. Furthermore, this enables the development of a novel and natural notion of bisimulation for hybrid systems, which is the final goal of this paper.
Stability of multi-class queueing systems with state-dependent service rates
Authors: Matthieu Jonckheere, Sem Borst
Venue: Proceedings of the 1st international conference on Performance evaluation methodolgies and tools (2006)

We examine the stability of multi-class queueing systems with the special feature that the service rates of the various classes depend on the number of users present of each of the classes. As a result, the various classes interact in a complex dynamic fashion. Such models arise in several contexts, especially in wireless networks, as resource sharing algorithms become increasingly elaborate, giving rise to scaling efficiencies and complicated interdependencies among traffic classes. Under certain monotonicity assumptions we provide an exact characterization of stability region. We also discuss how some of the results extend to weaker notions of monotonicity. The results are illustrated for simple examples of wireless networks with two or three interfering base stations.
The interactive virtual showcase: a four user display for museums
Authors: Hendrik Wendler, Bernd Fröhlich
Venue: Proceedings of the 2005 international conference on Augmented tele-existence (2005)

We describe the Interactive Virtual Showcase, which was developed for the interactive presentation of mixed reality scenarios in museums. We suggest a rugged design and an intuitive interaction metaphor, which is based on a tangible interface. The system was installed at a museum and is running for more than one year without major problems. The reaction of the numerous museum visitors has been very positive, which is partially due to the fact that the technology is mostly hidden from the users.
What makes groups learning effectively in a videoconference setting?
Authors: Ulrike Cress, Aemilian Hron, Felix Friedrich, Karsten Hammer
Venue: Proceedings of the 7th international conference on Learning sciences (2006)

In an experimental study designed to test co-operative learning in a videoconference setting, dyads were formed to work under three different conditions: "without a shared workspace", "with a shared workspace", or "with a shared workspace plus a content-specific graphical representation". The dyads without a shared workspace used more verbal co-ordination than both other groups. The dyads working with a shared workspace plus a content-specific graphical representation demonstrated better quality in their collaboratively written texts. The quality of this collaborative process resulted in better individual acquisition of important knowledge units. The study demonstrates that content-specific graphical representations make cooperative learning in videoconference-based learning settings more effective. The overall effects of a shared workspace were not so clear and should be further investigated.
.NET Internationalization: The Developer's Guide to Building Global Windows and Web Applications (Microsoft .Net Development Series)
Authors: Guy Smith-Ferrier
Venue:  (2006)

As business becomes more and more global, software developers increasingly need to make applications multi-lingual and culturally aware. The .NET Framework may well have the most comprehensive support for internationalization and globalization of any development platform to date, and .NET Internationalization teaches developers how to unlock and utilize that support.Experienced international application developer Guy Smith-Ferrier covers the internationalization of both Windows Forms and ASP.NET applications, using both Versions 1.1 and 2.0 of the .NET Framework. Smith-Ferrier not only teaches you the best ways to take advantage of the globalization and internationalization features built in to the .NET Framework and Visual Studio, he also provides original code to take globalized applications to the next level of international utility and maintainability.Key topics include·ï¾ ï¾ ï¾ An introduction to the internationalization process and how localization and globalization are supported in Windows and the .NET Framework·ï¾ ï¾ ï¾ The use of resource managers, cultures, resource DLLs, and localized strings, images, and files-including strongly typed resources·ï¾ ï¾ ï¾ Detailed coverage of form localization in Windows Forms and Web Forms·ï¾ ï¾ ï¾ Dealing with regional cultures and their casing, collation, and calendars·ï¾ ï¾ ï¾ Managing right-to-left Middle-Eastern text and pictographic East Asian languages·ï¾ ï¾ ï¾ How to use the book's original resource administration utilities·ï¾ ï¾ ï¾ How to translate resources with machine translation·ï¾ ï¾ ï¾ How to create custom cultures and integrate them with the .NET Framework 2.0 and Visual Studio 2005·ï¾ ï¾ ï¾ How resource managers work and how to write custom resource managers, including a resource manager that uses a database·ï¾ ï¾ ï¾ How to test your internationalization with FxCop using new and existing globalization rules·ï¾ ï¾ ï¾ How to effectively include the translator in the internationalization processWhether you are a developer, architect, or manager, if you are involved in international applications with the .NET Framework, this is the one book you need to read and understand before you start development.Guy Smith-Ferrier is an author, developer, trainer, and speaker with more than 20 years of software engineering experience. He has internationalized applications in four development platforms, including the .NET Framework. A frequent conference speaker, Guy is the author of C# and .NET courseware and has written numerous articles. You can read his blog at www.guysmithferrier.com.
Growth codes: maximizing sensor network data persistence
Authors: Abhinav Kamra, Vishal Misra, Jon Feldman, Dan Rubenstein
Venue: Proceedings of the 2006 conference on Applications, technologies, architectures, and protocols for computer communications (2006)

Sensor networks are especially useful in catastrophic or emergency scenarios such as floods, fires, terrorist attacks or earthquakes where human participation may be too dangerous. However, such disaster scenarios pose an interesting design challenge since the sensor nodes used to collect and communicate data may themselves fail suddenly and unpredictably, resulting in the loss of valuable data. Furthermore, because these networks are often expected to be deployed in response to a disaster, or because of sudden configuration changes due to failure, these networks are often expected to operate in a "zero-configuration" paradigm, where data collection and transmission must be initiated immediately, before the nodes have a chance to assess the current network topology. In this paper, we design and analyze techniques to increase "persistence" of sensed data, so that data is more likely to reach a data sink, even as network nodes fail. This is done by replicating data compactly at neighboring nodes using novel "Growth Codes" that increase in efficiency as data accumulates at the sink. We show that Growth Codes preserve more data in the presence of node failures than previously proposed erasure resilient techniques.
Single-Image Vignetting Correction
Authors: Yuanjie Zheng, Stephen Lin, Sing Bing Kang
Venue: Proceedings of the 2006 IEEE Computer Society Conference on Computer Vision and Pattern Recognition - Volume 1 (2006)

In this paper, we propose a method for determining the vignetting function given only a single image. Our method is designed to handle both textured and untextured regions in order to maximize the use of available information. To extract vignetting information from an image, we present adaptations of segmentation techniques that locate image regions with reliable data for vignetting estimation. Within each image region, our method capitalizes on frequency characteristics and physical properties of vignetting to distinguish it from other sources of intensity variation. The vignetting data acquired from regions are weighted according to a presented reliability measure to promote robustness in estimation. Comprehensive experiments demonstrate the effectiveness of this technique on a broad range of images.
SIMSOLUTION: an open simulation environment founded on extreme multitasking
Authors: Thomas Wiedemann
Venue: Proceedings of the 37th conference on Winter simulation (2005)

There is no universal standard for discrete simulation. Models, created with leading simulation tools can not be exchanged between the systems. In result, there are very high investments and maintenance costs for simulation studies and some additional problems with portability and performance in large simulation studies. This paper discusses in detail, a special approach by using an assembler based, very fast multitasking routine combined with efficient discrete event scheduling algorithms. The basic system approach is realized with Standard C/C++ and Delphi-compilers and offers an unlimited flexibility and very good runtime performance. Language independent, XML-based code generators convert simulation models between different run-time platforms without manual changes.
A blind source separation framework for detecting CPM sources mixed by a convolutive MIMO filter
Authors: Marc Castella, Pascal Bianchi, Antoine Chevreuil, Jean-Christophe Pesquet
Venue: Signal Processing (2006)

This paper deals with blind separation of convolutive mixtures of continuous phase modulated (CPM) sources. The main difficulty lies in the fact that CPM sources are non-linear (and hence non i.i.d.) sources. The problem is addressed through the general formulation of blind source separation (BSS). The separation method consists in iterative constrained optimizations of criteria depending on the fourth-order statistics. We prove the validity of the considered contrast functions for the extraction of one source. A local study then allows us to show that the optimization is free of spurious local maxima at each step and that it is possible to alleviate the error accumulation problem by using an unconstrained post-optimization technique. After separation is achieved, the emitted symbols are estimated, based on recent results concerning CPM equalization. Finally, simulations illustrate the validity of the method.