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Publications

Publications by CTM

2013

Immersive media experiences (immersiveme 2013 workshop at ACM multimedia)

Authors
Chambel, T; Bove, VM; Strover, S; Viana, P; Thomas, G;

Publication
MM 2013 - Proceedings of the 2013 ACM Multimedia Conference

Abstract
Immersive media has the potential for strong impact on users' emotions and their sense of presence and engagement. The main objective of this workshop is to bring together researchers, students, media producers, service providers and industry players in the area of emergent immersive media. The workshop will provide a platform for a deep discussion on ongoing work, recent achievements and experiences. It is expected not only to consolidate experiences but also to identify aspects where strong collaboration among all the interested players is needed and to point towards future working directions. Copyright © 2013 ACM.

2013

Immersive Media Experiences 2013 Workshop chairs' welcome

Authors
Chambel, T; Bove, VM; Strover, S; Viana, P; Thomas, G;

Publication
ImmersiveMe 2013 - Proceedings of the 2nd International Workshop on Immersive Media Experiences, Co-located with ACM Multimedia 2013

Abstract

2013

A Stent-Graft Endoleakage Monitor: Telemetry System Based on Inductive-Coupling Transmission for Implantable Pressure Sensors

Authors
Oliveira, C; Almeida, N; da Silva, JM;

Publication
2013 IEEE 3RD PORTUGUESE MEETING IN BIOENGINEERING (ENBENG)

Abstract
A direct arterial pressure monitoring system for post EVAR procedure based on inductive-coupling is presented which avoids the need for more complex biomedical imaging systems. Post stent-graft implantation complications, such as endoleaks, can be detected with capacitive pressure sensors placed in the stent-graft and monitored externally after the measurement of the oscillation frequency of a LC resonant circuit created by sensors and inductive coupling. Several measurements were performed in order to characterize the system and compare the results with the expected values based on theoretical models. Different measurements were carried-out with the purpose of evaluating the system's frequency detection accuracy throughout the working bandwidth and varying distances between the reader and the sensors. Both air and a phantom with electrical characteristics similar to the human body were used between the reader and the sensors antennas in order to evaluate the influence of the transmission medium. It is shown that in both cases the system is capable of detecting the oscillation frequencies, even in the case a cluster of sensors is used.

2013

Design Tradeoffs for Voltage Controlled Crystal Oscillators with Built-in Calibration Mechanisms

Authors
Cardoso, JP; da Silva, JM;

Publication
2013 8TH INTERNATIONAL DESIGN AND TEST SYMPOSIUM (IDT)

Abstract
Tinting is a critical issue in communication systems, especially for synchronous communications. These show a high dependence on the clock signal purity due to errors that can be introduced into the decision process. This paper addresses the design, on a 130nm CMOS process, of a Radiation Tolerant Voltage Controlled Quartz Crystal Oscillator (VCXO), including techniques to reduce the influence of radiation and noise on its performance. The VCXO is included on a PLL designed to work within High Energy Physics (IIEP) experiments.

2013

LoCoBoard: Low-Cost Interactive Whiteboard Using Computer Vision Algorithms

Authors
Soares, C; Moreira, RS; Torres, JM; Sobral, P;

Publication
ISRN Machine Vision

Abstract

2013

High-Gain Topologies for Transparent Electronics

Authors
Bahubalindruni, P; Tavares, VG; Barquinha, P; Martins, R; Fortunato, E;

Publication
2013 IEEE EUROCON

Abstract
Transparent TFT technologies, with amorphous semiconductor oxides are lacking a complementary type transistor. This represents a real challenge, when the design of high-gain amplifiers are considered, without resorting to passive resistive elements. However, some solutions do exist to overcome the lack of a p-type transistor. This paper then presents a comparison analysis of two high-gain single-stage amplifier topologies using only n-type enhancement transistors. In these circuits, high gain is achieved using positive feedback for the load impedance. The comparison is carried out in terms of bandwidth, power consumption and complexity under identical bias conditions. Further, the same load impedance is used to develop a novel high-gain multiplier. All the circuits are simulated using a 0.35 mu m CMOS technology, as it is easy to test the reliability of the methods, since CMOS transistors have trustworthy models.

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