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Displaying 1-19 out of 19 total
Design and Prototyping of Direct Torque Control of Induction Motors in FPGAs
Found in: Integrated Circuit Design and System Design, Symposium on
By Sandro Ferreira, Felipe Haffner, Luís Fernando Pereira, Fernando Moraes
Issue Date:September 2003
pp. 105
This work presents an implementation of a Direct Torque Control (DTC) strategy, which is used to control induction motors. Following a tendency in the research area, the algorithm proposed is implemented in an unique FPGA substrate, which allows for a fast...
 
MPEG-21: Goals and Achievements
Found in: IEEE Multimedia
By Ian Burnett, Rik Van de Walle, Keith Hill, Jan Bormans, Fernando Pereira
Issue Date:October 2003
pp. 60-70
<p>MPEG-21 is an open standards-based framework for multimedia delivery and consumption. It aims to enable the use of multimedia resources across a wide range of networks and devices. In this article, we discuss MPEG-21's parts, achievements, ongoing...
 
Binary tree decomposition depth coding for 3D video applications
Found in: Multimedia and Expo, IEEE International Conference on
By Goncalo Carmo,Matteo Naccari,Fernando Pereira
Issue Date:July 2011
pp. 1-6
Recent advances in three dimensional display technologies and the growing efforts put in the production of three dimensional videos are intensely demanding for new, more efficient three dimensional content representation formats. One promising for mat is t...
 
The Unreasonable Effectiveness of Data
Found in: IEEE Intelligent Systems
By Alon Halevy, Peter Norvig, Fernando Pereira
Issue Date:March 2009
pp. 8-12
Problems that involve interacting with humans, such as natural language understanding, have not proven to be solvable by concise, neat formulas like F = ma. Instead, the best approach appears to be to embrace the complexity of the domain and address it by ...
 
Using MPEG-7 for Generic Audiovisual Content Automatic Summarization
Found in: Image Analysis for Multimedia Interactive Services, International Workshop on
By Nuno Matos, Fernando Pereira
Issue Date:May 2008
pp. 41-45
This paper proposes and evaluates a fully automatic summarization application for generic audiovisual based on MPEG-7 compliant hierarchical summary descriptions, which allows providing flexibility, low complexity, and interoperability. The novelty of this...
 
MPEG-A: Multimedia Application Formats
Found in: IEEE Multimedia
By Klaus Diepold, Fernando Pereira, Wo Chang
Issue Date:October 2005
pp. 34-41
MPEG standards, instrumental in shaping the multimedia landscape since the early 1990s, are taking another step forward with MPEG-A, which specifies multimedia application formats. MAFs are essentially superformats that combine selected technology componen...
 
Multimedia Standards: Present and Future
Found in: Multimedia Computing and Systems, International Conference on
By Fernando Pereira
Issue Date:June 1999
pp. 9145
Multimedia services and applications, from videotelepnony and digital television to multimedia databases and 3D virtual environments, are undoubtedly among the novelties of the end of the century, already announcing the big changes that will characterize t...
 
Markov meets Bayes: technical perspective
Found in: Communications of the ACM
By Fernando Pereira
Issue Date:February 2011
pp. 90-90
What would it take for a true personal knowledge base to generate the benefits envisioned by Vannevar Bush?
     
Confidence-weighted linear classification
Found in: Proceedings of the 25th international conference on Machine learning (ICML '08)
By Fernando Pereira, Koby Crammer, Mark Dredze
Issue Date:July 2008
pp. 264-271
We introduce confidence-weighted linear classifiers, which add parameter confidence information to linear classifiers. Online learners in this setting update both classifier parameters and the estimate of their confidence. The particular online algorithms ...
     
A rate-distortion one-class model and its applications to clustering
Found in: Proceedings of the 25th international conference on Machine learning (ICML '08)
By Fernando Pereira, Koby Crammer, Partha Pratim Talukdar
Issue Date:July 2008
pp. 184-191
In one-class classification we seek a rule to find a coherent subset of instances similar to a few positive examples in a large pool of instances. The problem can be formulated and analyzed naturally in a rate-distortion framework, leading to an efficient ...
     
Intelligent email: reply and attachment prediction
Found in: Proceedings of the 13th international conference on Intelligent user interfaces (IUI '08)
By Fernando Pereira, John Blitzer, Josh Carroll, Joshua Magarick, Mark Dredze, Tova Brooks
Issue Date:January 2008
pp. 3-3
We present two prediction problems under the rubric of Intelligent Email that are designed to support enhanced email interfaces that relieve the stress of email overload. Reply prediction alerts users when an email requires a response and facilitates email...
     
Generating summary keywords for emails using topics
Found in: Proceedings of the 13th international conference on Intelligent user interfaces (IUI '08)
By Danny Puller, Fernando Pereira, Hanna M. Wallach, Mark Dredze
Issue Date:January 2008
pp. 3-3
Email summary keywords, used to concisely represent the gist of an email, can help users manage and prioritize large numbers of messages. We develop an unsupervised learning framework for selecting summary keywords from emails using latent representations ...
     
Developments and trends on video coding: is there a xVC virus?
Found in: Proceedings of the 2nd international conference on Ubiquitous information management and communication (ICUIMC '08)
By Fernando Pereira
Issue Date:January 2008
pp. 1-2
Video coding is a key technology behind the deployment of many devices, and services largely used nowadays around the world. After the first major developments in the 90s, recent years have seen the emergence of new needs, technologies and standards in the...
     
Learning to join everything
Found in: Proceedings of the sixteenth ACM conference on Conference on information and knowledge management (CIKM '07)
By Fernando Pereira
Issue Date:November 2007
pp. 9-10
Text, speech, images, video, DNA sequences provide information about entities that people can recognize when looking at a particular instance. But those entities and their attributes and relationships are not directly accessible to queries that join across...
     
Document expansion for speech retrieval
Found in: Proceedings of the 22nd annual international ACM SIGIR conference on Research and development in information retrieval (SIGIR '99)
By Amit Singhal, Fernando Pereira
Issue Date:August 1999
pp. 34-41
The TIPSTER collection is unusual because of both its size and detail. In particular, it describes a set of information needs, as opposed to traditional queries. These detailed representations of information need are an opportunity for research on differen...
     
SCAN: designing and evaluating user interfaces to support retrieval from speech archives
Found in: Proceedings of the 22nd annual international ACM SIGIR conference on Research and development in information retrieval (SIGIR '99)
By Amit Singhal, Don Hindle, Fernando Pereira, John Choi, Julia Hirschberg, Steve Whittaker
Issue Date:August 1999
pp. 26-33
The TIPSTER collection is unusual because of both its size and detail. In particular, it describes a set of information needs, as opposed to traditional queries. These detailed representations of information need are an opportunity for research on differen...
     
An efficient extension to mixture techniques for prediction and decision trees
Found in: Proceedings of the tenth annual conference on Computational learning theory (COLT '97)
By Fernando Pereira, Yoram Singer
Issue Date:July 1997
pp. 114-121
We examine the relationship between the VC-dimension and the number of parameters of a smoothly parametrized function class. We show that the VC-dimension of such a function class is at least k if there exists a k-dimensional differentiable manifold in the...
     
A brief introduction to Prolog
Found in: The second ACM SIGPLAN conference on History of programming languages (HOPL-II)
By Fernando Pereira
Issue Date:April 1993
pp. 199
Pascal was defined in 1970 and, after a slow start, became one of the most widely used languages in introductory programming courses. This article first summarises the events leading to Pascal's design and implementation, and then proceeds with a discussio...
     
Language, computation and artificial intelligence
Found in: ACM Computing Surveys (CSUR)
By Fernando Pereira
Issue Date:March 1988
pp. 9-es
Floating-point divide and square-root operations are essential to many scientific and engineering applications, and are required in all computer systems that support the IEEE floating-point standard. Yet many current microprocessors provide only weak supp...
     
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