Cookies Policy
The website need some cookies and similar means to function. If you permit us, we will use those means to collect data on your visits for aggregated statistics to improve our service. Find out More
Accept Reject
  • Menu
Publications

2008

How a cyber-physical system can efficiently obtain a snapshot of physical information even in the presence of sensor faults

Authors
Andersson, B; Pereira, N; Tovar, E;

Publication
PROCEEDINGS OF THE SIXTH INTERNATIONAL WORKSHOP ON INTELLIGENT SOLUTIONS IN EMBEDDED SYSTEMS

Abstract
We present a distributed algorithm for cyber-physical systems to obtain a snapshot of sensor data. The snapshot is an approximate representation of sensor data; it is an interpolation as a function of space coordinates. The new algorithm exploits a prioritized Medium Access Controll (MAC) protocol to efficiently transmit information of the sensor data. It scales to a very large number of sensors and it is able to operate in the presence of sensor faults.

2008

3D object reconstruction from uncalibrated images using a single off-the-shelf camera

Authors
Azevedo, TCS; Tavares, JMRS; Vaz, MAP;

Publication
COMPUTATIONAL VISION AND MEDICAL IMAGING PROCESSING

Abstract
Three-dimensional (3 D) objects' reconstruction using just bi-dimensional (21)) images has been a major research topic in Computer Vision. However, it is still a hard problem to solve, when automation, speed and precision are required and/or the objects present complex shapes and visual properties. In this paper, we compare two Active Computer Vision methods commonly used for the 3D reconstruction of objects from image sequences, acquired with a single off-the-shelf CCD camera: Structure From Motion (SFM) and Generalized Voxel Coloring (GVC) SFM recovers the 3D shape of an object using the camera(s)'s or object's movement, while VC is a volumetric method that uses photoconsistency measures to build a 31) model for the object. Both methods considered do not impose any kind of restrictions to the relative motion involved.

2008

Computational complexity with experiments as oracles

Authors
Beggs, E; Costa, JF; Loff, B; Tucker, JV;

Publication
PROCEEDINGS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES

Abstract
We discuss combining physical experiments with machine computations and introduce a form of analogue digital (AD) Turing machine. We examine in detail a case study where an experimental procedure based on Newtonian kinematics is combined with a class of Turing machines. Three forms of AD machine are studied, in which physical parameters can be set exactly and approximately. Using non-uniform complexity theory, and some probability, we prove theorems that show that these machines can compute more than classical Turing machines.

2008

Cluster-based novel concept detection in data streams applied to intrusion detection in computer networks

Authors
Spinosa, EJ; de Carvalho, APDF; Gama, J;

Publication
APPLIED COMPUTING 2008, VOLS 1-3

Abstract
In this paper, a cluster-based novelty detection technique capable of dealing with a large amount of data is presented and evaluated in the context of intrusion detection. Starting with examples of a single class that describe the normal profile, the proposed technique detects novel concepts initially as cohesive clusters of examples and later as sets of clusters in an unsupervised incremental learning fashion. Experimental results with the KDD Cup 1999 data set show that the technique is capable of dealing with data streams, successfully learning novel concepts that are pure in terms of the real class structure.

2008

A practical approach to lighting design course in an electrical engineering programme

Authors
Travassos Valdez, MM; Faustino Agreira, CI; Machado Ferreira, C; Maciel Barbosa, FP;

Publication
International Journal of Emerging Technologies in Learning

Abstract
Technology has allowed new insights and creativity into the learning and teaching process and also enables to try out in a much more flexible, dynamic way other learning experiences. This constitutes in itself a more engaging role for teachers as well as students helping them to explore and create new areas, opening up, at the same time, new perspectives into the process and maximizing the availability and use of the current tools which the same technology provides. The facilitation in the investigation work development of projects renders the learning and teaching activities really appealing, allowing at the same time levels of effectiveness in this extremely modern and global era. This study integrates technology in the learning process and evaluation of its various outcomes. This case study describes the experience of two teachers with their class along a semester using computer aided technology for instruction and assessment. The task involved the lighting design of monuments with the purpose of attracting the on lookers' attention, enhancing the beauty and attributes of the façade of monuments or buildings considered relevant or of public interest. An approach of reinforcement learning applied to the historical monuments light configurations will be described.

2008

Challenges in Health Smart Homes

Authors
Bartolomeu, P; Fonseca, J; Vasques, F;

Publication
2008 2ND INTERNATIONAL CONFERENCE ON PERVASIVE COMPUTING TECHNOLOGIES FOR HEALTHCARE

Abstract
This paper presents an overview of the challenges in developing Health Smart Homes targeting, in particular, elderly and impaired people. As such, it identifies the current endeavors as well as the main areas of research.

  • 3988
  • 4525