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CMOS memories occupy a significant percentage of the Integrated Circuits footprint. With the development of new manufacturing technologies to a smaller scale, performance and reliability challenges exist, namely caused by parametric variations such as Process variations (P), power supply Voltage (V) and Temperature (T), and Aging (A) or, in a general perspective, PVTA variations. The purpose of this...
The short-term path planning of a robotic sailboat is a specially challenging task, since the sailboat can not reach points that are directly against the wind following a straight path given by some higher-level trajectory planner. Towards solving this specific problem, this work proposes a short-term path planning method for autonomous sailboats that is capable of dealing with upwind situations....
The accumulation of compatible solutes is a prerequisite for the adaptation of microorganisms to osmotic stress imposed by salt or organic solutes. Two types of strategies exist to cope with high external solute concentrations; one strategy is found in the extremely halophilic Archaea of the family Halobacteriaceae and the Bacteria of the order Haloanaerobiales involving the accumulation of inorganic...
This work proposes an artificial neural network approach to estimate the induction motor speed applied in a closed-loop scalar control. The induction motor speed is the important quantity in an industrial process. Thus, when the load coupled to the axis needs speed control, some of the drive and control strategies are based on the estimated axis speed of the motor. This paper proposes an alternative...
After a massive adoption by domestic users, instant messaging (IM) wins a significant dimension in business domain. Its adoption in organizations, as a tool in the daily work, leads to a set of changes for all the employees. Their use generates relevant positive impacts, by establishing a more dynamic communication within the organization, but also with clients, partners and suppliers, which results...
This work proposes an artificial neural network approach to estimate the induction motor speed applied in a closed-loop scalar control. The induction motor speed is the important quantity in an industrial process. However, the direct measurement of speed compromises the driver system and control, besides increasing the implementation cost. The proposed strategy estimates the induction motor speed...
Age related Macular Degeneration (AMD) is a disease of the retina associated with aging. AMD progression in patients is characterized by drusen, pigmentation changes, and geographic atrophy, which can be seen using fundus imagery. The level of AMD is characterized by standard scaling methods, which can be somewhat subjective in practice. In this work we propose a statistical image processing approach...
Auditing Information Systems Security is difficult and becomes crucial to ensure the daily operational activities of organizations as well as to promote competition and to create new business opportunities. A conceptual security framework to manage and audit Information System Security is proposed and discussed. The proposed framework is based on a conceptual model approach, based on the ISO/IEC_JCT1...
The main task of the Tile calorimeter Detector Control System (DCS) is to enable the coherent and safe operation of the calorimeter. All actions initiated by the operator, as well as all errors, warnings and alarms concerning the hardware of the detector are handled by DCS. The Tile calorimeter DCS controls and monitors mainly the low voltage and high voltage power supply systems, but it is also interfaced...
This paper presents the implementation of a dual carrier modulation (DCM) demapper, proposed as part of a MB-OFDM UWB receiver to be integrated in an FPGA. The implemented DCM demapper, together with the FFT and the Viterbi decoder, were implemented in a Xilinx Virtex-5 FPGA. The complete system was modelled and tested with Matlab/Simulink and the part implemented in FPGA was connected to Matlab using...
Rapid expansion of the Internet and increasing demand for multimedia services fosters an immediate need for the development of new high-capacity networks capable of supporting these growing bandwidth requirements. The development of broadband transport networks resulted in the need for next generation switches/routers with high-speed interfaces and large switching capacity. The main part of every...
Single-walled carbon nanotube (SWNT) networks were tested as gas sensors for nitrogen dioxide detection. Sensor films were fabricated by airbrushing SWNT dispersions on alumina substrates. Sensors were characterized by resistance measurements from 25 to 200?C. The best response to NO2 was obtained at 200?C. The tested SWNT sensors were sensitive to low NO2 concentrations in nitrogen and air atmospheres...
Multi-walled carbon nanotube (MWNT) networks were investigated as resistive gas sensors for nitrogen dioxide detection. Sensor films were fabricated by airbrushing MWNT dispersions on alumina substrates. Sensors were characterized by resistance measurements from 25 to 250degC in air atmosphere, in order to find the optimum detection temperature. The best response to NO2 was obtained at 25degC. The...
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