INTERNATIONAL STANDARD SERIAL NUMBERS (Translation and Original): 0740-7475Although parity prediction arithmetic operators are compatible with systems checked by parity codes, they are not secure against single faults. The authors determine the necessary conditions for fault secureness and derive designs embodying these conditions
Parity prediction arithmetic operators are compatible with data paths and memory systems checked by parity codes. The authors extend their theory for achieving fault-secure design of parity prediction multipliers and dividers to Booth multipliers using operand recoding
ABSTRACT:The basic drawback of parity prediction arithmetic operators is that they may not be fault secuw for single faults. In a recent work we have proposed a theory for achieving fault secure design for parity prediction multipliers and dividers. This paper has not considered the case of Booth multipliers using operand recoding. This case is analyzed here. Parity prediction logic and fault secure implementation for this scheme is derived.
Abstract:satellite using a digital signal processor. The main motivation of this study is the attitude control system of the the aim of testing the adequacy of the adopted control. The next steps had included an analysis of discretization
modulator. The validation tests used a scheme of co-simulation, where the model of the satellite was simulated inand required time to achieve a given mission accuracy are determined, and results are provided as illustration.
This paper presents the project of a robotic device for propulsion in aquatic environment. The propulsor is a biologically inspired system characterized by efficiency and flexibility for locomotion environment changing: the legs of anuran amphibious. These animals are exceptionally adapted to locomotion in water and land. This type of locomotion requires specific features of the mechanisms that are hardly provided by traditional solutions based on standard electric motors. The proposed approach is based on ionomeric polymers-metal composites drives, constituting a system commonly called artificial muscle. The paper presents the anuran locomotion modeling, a description of the electroactive polymers, the experimental production procedures and results, and also discusses some constructive aspects of a first device prototype.
This work deals with the problem of the design of an autonomous redundant system for the attitude determination of nanosatellites. The system consists of a circuit board equipped with three microcontrollers, a magnetic field sensor in three axes, and complementary commercial-of-the-shelf (COTS) components and connectors to provide data signal exchange the vehicle on-board computer. The main goal of this system, named SDATF (of the acronym in Portuguese Sistema de Determinação de Atitude com Tolerância a Falhas), is to provide autonomously the vehicle attitude from the information collected from the onboard computer (OBC) and the magnetometer. The adopted attitude determination algorithm is based on the well-known QUEST method, and the goal of this system is to get accurate attitude computations to low-orbit CubeSat satellites using COTS electronic components, and to provide highly reliable data and high availability levels using fault tolerance tools to avoid the harmful consequences of spatial radiation and its faults known as single event upsets (SEU). The article presents the general design of the fault-tolerant systems and experimental tests using bit flip injection methodology.
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