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Search Results: 1 - 10 of 9589 matches for " Adrat Marc "
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Iterative Source-Channel Decoding: Improved System Design Using EXIT Charts
Adrat Marc,Vary Peter
EURASIP Journal on Advances in Signal Processing , 2005,
Abstract: The error robustness of digital communication systems using source and channel coding can be improved by iterative source-channel decoding (ISCD). The turbo-like evaluation of natural residual source redundancy and of artificial channel coding redundancy makes step-wise quality gains possible by several iterations. The maximum number of profitable iterations is predictable by an EXIT chart analysis. In this contribution, we exploit the EXIT chart representation to improve the error correcting/concealing capabilities of ISCD schemes. We propose new design guidelines to select appropriate bit mappings and to design the channel coding component. A parametric source coding scheme with some residual redundancy is assumed. Applying both innovations, the new EXIT-optimized index assignment as well as the appropriately designed recursive nonsystematic convolutional (RNSC) code, allows to outperform known approaches to ISCD by far in the most relevant channel conditions.
Efficient And Portable SDR Waveform Development: The Nucleus Concept
Venkatesh Ramakrishnan,Ernst M. Witte,Torsten Kempf,David Kammler,Gerd Ascheid,Heinrich Meyr,Marc Adrat,Markus Antweiler
Mathematics , 2009, DOI: 10.1109/MILCOM.2009.5379897
Abstract: Future wireless communication systems should be flexible to support different waveforms (WFs) and be cognitive to sense the environment and tune themselves. This has lead to tremendous interest in software defined radios (SDRs). Constraints like throughput, latency and low energy demand high implementation efficiency. The tradeoff of going for a highly efficient implementation is the increase of porting effort to a new hardware (HW) platform. In this paper, we propose a novel concept for WF development, the Nucleus concept, that exploits the common structure in various wireless signal processing algorithms and provides a way for efficient and portable implementation. Tool assisted WF mapping and exploration is done efficiently by propagating the implementation and interface properties of Nuclei. The Nucleus concept aims at providing software flexibility with high level programmability, but at the same time limiting HW flexibility to maximize area and energy efficiency.
Awareness of Lung Cancer Symptoms and Risk Factors in General Population  [PDF]
Hanna Maria Hanson, Mait Raag, Merje Adrat, Tanel Laisaar
Open Journal of Respiratory Diseases (OJRD) , 2017, DOI: 10.4236/ojrd.2017.71001
Abstract: Introduction: Lung cancer is often diagnosed in a late stage, which might be related to lack of risk factors and symptoms awareness. Aim of this study was to evaluate these factors. Methods: A survey was conducted to assess the awareness of lung cancer risk factors and symptoms. Kruskal-Wallis, Fisher and chi-square tests were used to compare the groups. Results: Altogether 403 participants (108 male; median age 29 (range 13 to 74) years; 98 smokers, 90 ex-smokers and 212 non-smokers) completed the survey (321 filled in online questionnaire, 82 were interviewed face-to-face). Three per cent of the respondents were unable to name any lung cancer risk factor, 36% named one and 61% named two or more. Smoking was mentioned most commonly, others far less often. When presented with a list of lung cancer risk factors, 99.7% of respondents recognised two or more; most commonly smoking (99%) and second-hand smoking (95%). Concerning symptoms, 17% were unable to name any, 21% named one and 62% named two or more. Prolonged cough was mentioned most often (59%), followed by dyspnea (45%) and chest pain (30%). When presented with a list, 99% of respondents recognised two or more symptoms; most often prolonged cough (86%), weakness (85%) and chest pain (82%). There were no statistical differences in lung cancer symptom, risk factor or prognosis awareness among smokers, ex-smokers and non-smokers. There were some differences related to age, sex, education and type of used questionnaire. Conclusions: Awareness of lung cancer risks and symptoms is moderate in general population without major differences between smokers and non-smokers.
Editorial Article for the Journal of Microscopy Research  [PDF]
Marc Porti
Microscopy Research (MR) , 2013, DOI: 10.4236/mr.2013.12002
Abstract: Editorial; MR
Ionic Group Derivitized Nano Porous Carbon Electrodes for Capacitive Deionization  [PDF]
Marc Andelman
Journal of Materials Science and Chemical Engineering (MSCE) , 2014, DOI: 10.4236/msce.2014.23002

Capacitance for electrostatic adsorption forms primarily within a Debye length of the electrode surface. Capacitive carbon electrodes were derivatized with ionic groups by means of adsorbing a surfactant in order to test the theory that attached ionic groups would exclude co-ions and increase coulombic efficiency without the need for an added charge barrier membrane. It has been discovered that capacitive electrodes surface derivatized with ionic groups become polarized and intrinsically more coulombically efficient.

Soldner Had Found in 1802 the Deflection of the Light by the Sun as the General Relativity Shows  [PDF]
Marc Mignonat
Journal of Modern Physics (JMP) , 2018, DOI: 10.4236/jmp.2018.98095
Abstract: Systematically, it is written in the literature that only the general relativity (GR) allows finding the just value of the deflection of the light by the sun. Yet, we noted, by reading over the original text of SOLDNER of 1801: “Ueber die Ablenkung eines Lichtstrals von seiner geradlinigen Bewegung, durch die Attraktion eines Weltkörpers, the welchem er nahe vorbei geht” (that we think it is important to put in English in full in Appendix) that, contrary to what we read since about 100 years, he found the right value. Soldner had started from a Newtonian gravitational calculation and, with the value of 1801, find 1.64”. This calculation, with the actual values, allows finding the right value of 1.752”. There are reasons to explain the wrong calculations which we usually make. However, there is no epistemological reason for questioning the general relativity. Some observations are only explained by the GR. But the Newtonian calculations are much simpler. We can continue to say that the theory of Newton is incomplete but we cannot say it is false.
Missing Mass and Galactic Dust with a Size Greater than 200 Microns, Minimum Size of the Micrometric Dust around the Sun  [PDF]
Marc Mignonat
Journal of Modern Physics (JMP) , 2019, DOI: 10.4236/jmp.2019.105038
Abstract: The studies of the glaciologists show that, since 30,000 years, the Earth receives every year approximately 40,000 tons of dust, dust with an average size about 200 microns. By determining of which volume these 40,000 T come and by showing that the density of this volume is significant within the density of the milky way, I have tried to estimate the mass of dust contained in the Galaxy. To support that this density close to earth is representative, arguments are given: 1) the distribution of great dust is largely homogeneous in the galaxy (what does not exclude the existence of gas or dust clouds with different densities in the milky way); 2) there would be a minimum size that I have calculated for micrometeorites in the solar environment, and so there would be a lack of the micrometeorites with a size between 5 and 50 microns. So the density would not be greater in the solar system. Next, a very simple rough calculation (as the one made by the observatory of Paris in 1910) allows estimating this mass near 4 times that of the dark matter. So, the interstellar dust with a large size (>200 μ) could it be the missing mass? A verification method is proposed to confirm or refute this hypothesis.
A Simplified Nonlinear Generalized Maxwell Model for Predicting the Time Dependent Behavior of Viscoelastic Materials  [PDF]
Marc Delphin Monsia
World Journal of Mechanics (WJM) , 2011, DOI: 10.4236/wjm.2011.13021
Abstract: In this paper, a simple nonlinear Maxwell model consisting of a nonlinear spring connected in series with a nonlinear dashpot obeying a power-law with constant material parameters, for representing successfully the time-dependent properties of a variety of viscoelastic materials, is proposed. Numerical examples are performed to illustrate the sensitivity of the model to material parameters.
Using Clinical Case Studies to Teach Biochemistry in a Doctoral Program: A Descriptive Paper  [PDF]
Marc P. McRae
Creative Education (CE) , 2012, DOI: 10.4236/ce.2012.37174
Abstract: Introduction: Biochemistry has traditionally been taught through lectures and rote memorization paying little attention to nurturing key problem solving skills. The literature on clinical case studies utilized in health education indicates that case studies facilitate and promote active learning, help clinical problem solving and encourage the development of critical thinking skills. Methods: This paper describes a method of using clinical case studies to deepen and solidify the students understanding of biochemical facts and concepts as related to clinical medicine. Discussion: Clinical case studies can be a helpful adjunct for teaching the content of human biochemistry that complements the traditional approach of lecture, textbook and laboratory. The learning issues presented to the students required them to reformulate biochemical concepts in their own words, integrate diverse principles and decide what information was important and what was superfluous. Limitations include a small subset of students riding the coat tails of their more ambitious peers, and biochemistry professors not having the confidence to take the students through a clinical case study because they may feel like they do not have sufficient “clinical expertise”. Conclusion: Clinical case studies are a valuable addition to the traditional methods of lecture, textbook reading and laboratory for teaching biochemistry. More importantly clinical case studies help remind students that what they are learning has relevance in the real world, and may help motivate students to pay more attention to the numerous facts faced in biochemistry.
Urban Geography and the Production of Socio-Environmental Inequalities  [PDF]
Marc Parés
International Journal of Geosciences (IJG) , 2013, DOI: 10.4236/ijg.2013.46A2006

In this article we use the Urban Political Ecology approach to show that by analysing governance networks we can better understand the production of certain socio-environmental transformations that negatively affect some social groups while benefiting others. Drawing upon two case studies in the UK, the article explores the dialectical relationships between different modes of urban governance on one hand and the socio-environmental transformations fulfilled in each case study on the other hand. The article concludes that although urban regeneration policies are always constrained by the neoliberal established framework of power relations, policy outputs and outcomes could be very different from one place to another, shaping uneven socio-environmental constructions. Finally, we make some recommendations in order to stimulate the production of more sustainable communities in the future.

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