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Search Results: 1 - 10 of 6064 matches for " Fabrice Monteiro "
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A Self-Checking Hardware Journal for a Fault-Tolerant Processor Architecture
Mohsin Amin,Abbas Ramazani,Fabrice Monteiro,Camille Diou,Abbas Dandache
International Journal of Reconfigurable Computing , 2011, DOI: 10.1155/2011/962062
Abstract: We introduce a specialized self-checking hardware journal being used as a centerpiece in our design strategy to build a processor tolerant to transient faults. Fault tolerance here relies on the use of error detection techniques in the processor core together with journalization and rollback execution to recover from erroneous situations. Effective rollback recovery is possible thanks to using a hardware journal and chosing a stack computing architecture for the processor core instead of the usual RISC or CISC. The main objective of the journalization and the hardware self-checking journal is to prevent data not yet validated to be sent to the main memory, and allow to fast rollback execution on faulty situations. The main memory, supposed to be fault secure in our model, only contains valid (uncorrupted) data obtained from fault-free computations. Error control coding techniques are used both in the processor core to detect errors and in the HW journal to protect the temporarily stored data from possible changes induced by transient faults. Implementation results on an FPGA of the Altera Stratix-II family show clearly the relevance of the approach, both in terms of performance/area tradeoff and fault tolerance effectiveness, even for high error rates. 1. Introduction For years, a substantial research effort has been successfully devoted to increase the performance of processor architectures, while making the best profit of the technological improvements predicted by Moore’s law. However, the long-followed approach is reaching its limits. Indeed, the current technological boundaries are raising major constraints on future architectures, particularly in terms of reliability and fault tolerance, given the enlarging rates of physical defects and the increased sensitivity to external disturbances. Fault tolerance aims at building systems that behave satisfactorily even in the presence of faults. The tolerance of a system is devised to some predefined set of fault types that may include transient, intermittent, or permanent faults, depending on the fault causes being addressed. What can be considered as a satisfactory behavior can vary according to the application domains: a simple error detection with an error alarm indication may be acceptable in some cases while in other cases, the system must ensure operation continuity with no visible impact on the service being delivered. Transient faults, long while considered as a problem only in space applications and some other critical domains such as nuclear plants, are now becoming a significant threat at sea
A New Efficient and Reliable Dynamically Reconfigurable Network-on-Chip
Cédric Killian,Camel Tanougast,Fabrice Monteiro,Abbas Dandache
Journal of Electrical and Computer Engineering , 2012, DOI: 10.1155/2012/843239
Abstract: We present a new reliable Network-on-Chip (NoC) suitable for Dynamically Reconfigurable Multiprocessors on Chip systems. The proposed NoC is based on routers performing online error detection of routing algorithm and data packet errors. Our work focuses on adaptive routing algorithms which allow to bypass faulty components or processor elements dynamically implemented inside the network. The proposed routing error detection mechanism allows to distinguish routing errors from bypasses of faulty components. The new router architecture is based on additional diagonal state indications and specific logic blocks allowing the reliable operation of the NoC. The main originality in the proposed NoC is that only the permanently faulty parts of the routers are disconnected. Therefore, our approach maintains a high run time throughput in the NoC without data packet loss thanks to a self-loopback mechanism inside each router.
Is Fish Domestication Going Too Fast?  [PDF]
Fabrice Teletchea
Natural Resources (NR) , 2016, DOI: 10.4236/nr.2016.76034
Abstract: Domestication is a very strong process that has enabled humans to produce both plants and animals with desired traits. For land animals, this process started about 12,000 years ago and resulted in that today hundreds of well-defined breeds are available for the five most important farmed mammal species (cattle, pig, horse, sheep and goat). For aquatic animals, this process started much earlier, and the bulk of domestication of new species dated back only to the early 1980s. Nevertheless, there are now numerous fish species for which the life cycle is already closed in captivity and some domesticated fish have been genetically improved. This implies that what probably took hundreds of years in mammals (i.e., to control the life cycle in captivity and then to improve captive individuals) has been accomplished in only tens of years for some fish species. Based on the main problems observed today in farmed mammals, the possible consequences of this fast domestication of fish are discussed.
Discrimination of native wood charcoal by infrared spectroscopy
Davrieux, Fabrice;Rousset, Patrick Louis Albert;Pastore, Tereza Cristina Monteiro;Macedo, Lucélia Alves de;Quirino, Waldir Ferreira;
Química Nova , 2010, DOI: 10.1590/S0100-40422010000500016
Abstract: brazil is one of the largest producers and consumers of charcoal in the world. about 50% of its charcoal comes from native forests, with a large part coming from unsustainable operations. the anatomic identification of charcoal is subjective; an instrumental technique would facilitate the monitoring of forests. this study aimed to verify the feasibility of using medium and near infrared reflectance spectroscopy to discriminate native (ipê) from plantation charcoals (eucalyptus). principal components analysis, followed by discriminant factorial analysis formed two different groups indicated by mahalanobis distances of 40.6 and 80.3 for near and mid infrared, respectively. validation of the model showed 100% efficacy.
Beliefs, Values and Morals: The Philosophical Underpinnings of Dysthanasia  [PDF]
Filipe Monteiro
Open Journal of Philosophy (OJPP) , 2016, DOI: 10.4236/ojpp.2016.64037
Abstract: In medical practice, the treatment and prognosis in the end of life has associated to ethical dilemmas, which are established in conformity with individual or collective beliefs and values. Dysthanasia from Greek, means to make death difficult, and it is currently an ethical problem with significant consequences. Considering that death itself has two moments, the process of death and the moment of death, dysthanasia is the undue prolongation of the process of death with the help of technological devices that allows the life sustaining procedures. Although it is through the technological advances that the moment of death can be delayed, it is the beliefs and values that are deep rooted in the sub conscience of the physicians that are responsible for the demeanor of end of life ethical dilemmas. Beliefs and values when encompassed in areas like phenomenology of knowledge, dialectic of technology, conflict of values and existentialism and metaphysics, can somehow explain this issue that is current, emerging and compelling.
Adaptive Performance Improvement of Fiber Bragg Grating in Radio over Fiber System  [PDF]
Fabrice Mfuamba Kabonzo, Yunfeng Peng
Journal of Computer and Communications (JCC) , 2016, DOI: 10.4236/jcc.2016.43001

The combination of Radio Frequency and Optical Fiber has resulted high capacity transmission at lower costs components and makes Radio over Fiber as a current trend of large broadband communication. In Fiber optics field, the use of Fiber Bragg Grating (FBG) was been proposed in recent research with different purpose of uses. However, the compensation of dispersion method of Fiber Bragg Grating (FBG) can boost significantly the system performance. This paper investigates the performance capacity improvement of adaptive Radio over Fiber system. The system design was performed using OptiSystem 7.0 software, which 10 Gb/s Non Return to Zero (NRZ) signal was launched into 50 Km Universal Mode Fiber and Fiber Bragg Grating was used as a compensator of dispersion before frequency up conversion. Therefore, the system performances were investigated by comparing the Bit Error Rate (BER) and Q-factors of Positive Intrinsic Negative (PIN) and Ultrafast Avalanche Photodiode (APD) as optical receivers. The Eye diagram analyzer showed acceptable improvement due to use of Fiber Bragg Grating as a compensator of dispersion.

Hammerhead Ribozymes: True Metal or Nucleobase Catalysis? Where Is the Catalytic Power from?
Fabrice Leclerc
Molecules , 2010, DOI: 10.3390/molecules15085389
Abstract: The hammerhead ribozyme was first considered as a metalloenzyme despite persistent inconsistencies between structural and functional data. In the last decade, metal ions were confirmed as catalysts in self-splicing ribozymes but displaced by nucleobases in self-cleaving ribozymes. However, a model of catalysis just relying on nucleobases as catalysts does not fully fit some recent data. Gathering and comparing data on metal ions in self-cleaving and self-splicing ribozymes, the roles of divalent metal ions and nucleobases are revisited. Hypothetical models based on cooperation between metal ions and nucleobases are proposed for the catalysis and evolution of this prototype in RNA catalysis.
Versión real y versión monetaria de una economía de mercado artesanal
Lecturas de Economía , 2008,
Abstract: the handcraft market represents the social division of work because it is referred to the exchange between separated producers; unlike pure exchange and capitalist economies, the handcraft economy integrates production but gets rid off the technical division of work. this paper displays both real and monetary models of the handcraft market where each consumer-producer generalist, maximizes his utility function. in the first model a "general market economy" arises, which is related to relative equilibrium prices, whereas in the second one, the monetary model, a "particular market economy" arises, which is linked to absolute disequilibrium prices.
Los juegos antropologicos de Saint-Louis
Delsahut, Fabrice;
Revista Brasileira de Ciências do Esporte , 2011, DOI: 10.1590/S0101-32892011000400002
Abstract: in1904, in the louisiana purchase exposition, the olympic games couldn't escape the rise in the racist ideologies of the 20th century and they contributed to the discussing of the athletic merit of the different races. their organizers set up special competitions, called for the occasion ? anthropology days ?, reserved for those who were considered as primitives by the segregationist america of that time. the impact of the race studies on the ways of thinking sport, contrary to what the different chairmen of the ioc tried hard to make believe during the new decades, was not only an unfortunate moment in the history of the olympic movement. we shall make some forecasts regarding the influence of that interracial athletic show in the united states but also in the world, in particular through the role of the press. the anthropology days surely allowed a certain perception of otherness and limited the integration of native peoples in the world sports fabric.
Alzheimer’s disease: psychiatric or neurological disorder?
Fabrice Gzil
Poiesis & Praxis , 2009, DOI: 10.1007/s10202-008-0061-3
Abstract: Le but de cette contribution est d’apporter quelques éclairages historiques et conceptuels sur la question de l’impact des développements récents en neurosciences sur le concept de maladie psychiatrique. Pour réfléchir à cette question, la maladie d’Alzheimer est un exemple intéressant pour deux raisons. Premièrement, la maladie d’Alzheimer a un statut assez ambigu au sein des affections qui touchent le psychisme: le fait que l’on dise généralement qu’il s’agit d’une maladie “neuropsychiatrique” illustre la difficulté qu’il y a à la ranger au sein des affections “neurologiques” ou au sein des affections “psychiatriques”. Deuxièmement, la notion de maladie d’Alzheimer a été inventée au début du 20e siècle, au moment où les neurosciences commen aient à prendre leur essor: en comparant les conceptions d’Alzheimer et les conceptions actuelles, on peut espérer cerner d’un peu plus près ce qui constitue la spécificité des neurosciences contemporaines.
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