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Search Results: 1 - 10 of 26 matches for " Meni Malliori "
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Estimating the Disease Burden of 2009 Pandemic Influenza A(H1N1) from Surveillance and Household Surveys in Greece
Vana Sypsa,Stefanos Bonovas,Sotirios Tsiodras,Agoritsa Baka,Panos Efstathiou,Meni Malliori,Takis Panagiotopoulos,Ilias Nikolakopoulos,Angelos Hatzakis
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0020593
Abstract: The aim of this study was to assess the disease burden of the 2009 pandemic influenza A(H1N1) in Greece.
Economic Recession and Emergence of an HIV-1 Outbreak among Drug Injectors in Athens Metropolitan Area: A Longitudinal Study
Dimitrios Paraskevis, Georgios Nikolopoulos, Anastasios Fotiou, Chrissa Tsiara, Dimitra Paraskeva, Vana Sypsa, Marios Lazanas, Panagiotis Gargalianos, Mina Psichogiou, Athanasios Skoutelis, Lucas Wiessing, Samuel R. Friedman, Don C. d. e. s. Jarlais, Manina Terzidou, Jenny Kremastinou, Meni Malliori, Angelos Hatzakis
PLOS ONE , 2013, DOI: 10.1371/journal.pone.0078941
Abstract: Background During 2011, a dramatic increase (1600%) of reported HIV-1 infections among injecting drug users (IDUs) was noted in Athens, Greece. We herein assess the potential causal pathways associated with this outbreak. Methods Our study employed high resolution HIV-1 phylogenetic and phylogeographic analyses. We examined also longitudinal data of ecological variables such as the annual growth of gross domestic product (GDP) of Greece in association with HIV-1 and HCV sentinel prevalence in IDUs, unemployment and homelessness rates and HIV transmission networks in Athens IDUs before and during economic recession (2008–2012). Results IDU isolates sampled in 2011 and 2012 suggested transmission networks in 94.6% and 92.7% of the cases in striking contrast with the sporadic networking (5%) during 1998–2009. The geographic origin of most HIV-1 isolates was consistent with the recently documented migratory waves in Greece. The decline in GDP was inversely correlated with annual prevalence rates of HIV and HCV and with unemployment and homelessness rates in IDUs (all p<0.001). The slope of anti-HCV prevalence in the sentinel populations of IDUs and in “new” drug injectors was found 120 and 1.9-fold (p = 0.007, p = 0.08 respectively) higher in 2008–2012 (economic recession) compared with 2002–2006. The median (25th, 75th) size of transmission networks were 34 (12, 58) and 2 (2, 2) (p = 0.057) in 2008–2012 and 1998–2007, respectively. The coverage of harm reduction services was low throughout the study period. Conclusions Scaling-up harm reduction services and addressing social and structural factors related to the current economic crisis should be urgently considered in environments where HIV-1 outbreaks may occur.
Analysis of Bitcoin Pooled Mining Reward Systems
Meni Rosenfeld
Computer Science , 2011,
Abstract: In this paper we describe the various scoring systems used to calculate rewards of participants in Bitcoin pooled mining, explain the problems each were designed to solve and analyze their respective advantages and disadvantages.
Analysis of Hashrate-Based Double Spending
Meni Rosenfeld
Computer Science , 2014,
Abstract: Bitcoin is the world's first decentralized digital currency. Its main technical innovation is the use of a blockchain and hash-based proof of work to synchronize transactions and prevent double-spending the currency. While the qualitative nature of this system is well understood, there is widespread confusion about its quantitative aspects and how they relate to attack vectors and their countermeasures. In this paper we take a look at the stochastic processes underlying typical attacks and their resulting probabilities of success.
Aggression on the Road as a Function of Stress, Coping Strategies and Driver Style  [PDF]
Lipaz Shamoa-Nir, Meni Koslowsky
Psychology (PSYCH) , 2010, DOI: 10.4236/psych.2010.11006
Abstract: According to Lazarus and Folkman’s [1] transactional cognitive model, people differ in their sensitivity and vulnerabil- ity to stressful events. Using questionnaire and observational techniques, the model was tested as a possible explanation for aggressive driving behavior. Responses from 226 drivers who were also observed driving their cars provided evidence for a link between stress and aggressive driving as well as between problem-solving strategy as a coping device in stressful situations and hostile behaviors. In addition, analysis showed that, in general, the more years of driving experience a driver has, the more likely he/she is to respond with instrumental rather than hostile aggression. Besides support for the theoretical model, some of the practical applications as they related to highway safety and the prevention of traffic accidents were presented.
Nurses' Voluntary Turnover during Early Hospital Career as Predicted by Depressive Symptoms and Anxiety Symptoms
Meyrav Marom,Meni koslowsky
International Journal of Psychological Studies , 2012, DOI: 10.5539/ijps.v4n2p188
Abstract: Using a longitudinal design, this study examined the unique effects of depressive symptoms and of anxiety symptoms on voluntary turnover of nurses during the early stage of their hospital career. We hypothesized that depressive symptoms would negatively predict turnover and that anxiety symptoms would positively predict turnover after controlling for their common variance. We also hypothesized the same effects for depressive and anxiety symptoms when assessed as changes over time. We collected longitudinal data from 201 newly employed hospital nurses in 25 general hospitals who completed questionnaires with a time lag of about six months at Time 1 (T1) and Time 2 (T2). To gauge turnover, we used the official hospitals' records at Time 3 (T3), about one year after the study's T1. Logistic regressions were used to test our hypotheses. As expected, we found that T2 anxiety symptoms increased the odds of the nurses' turnover while T2 depressive symptoms decreased it. As expected, the higher the increase between T1 and T2 in depressive symptoms, the lower the odds of the nurses turnover. However, we did not support the expectation that the T1 to T2 changes in anxiety symptoms would predict turnover positively. We suggest that the unique content of depression and anxiety differ markedly in their effects on quitting behavior.
Transverse invariant measures extends to the ambient space
Carlos Meni?o Cotón
Mathematics , 2011,
Abstract: It is shown that any transverse invariant measure of a foliated space can be considered as a measure on the ambient space.
Secondary LS category of measured laminations
Carlos Meni?o Cotón
Mathematics , 2012, DOI: 10.1007/s11856-014-1105-0
Abstract: In the author's Ph.D., a version of the tangential LS category for foliated spaces depending on a transverse invariant measure, called the measured category, was introduced. Unfortunately, the measured category vanishes easily. When it is zero, the rate of convergence to zero of the quantity involved in the de?nition, by taking arbitrarily large homotopies, gives a new invariant, called the secondary measured category. Several versions of classical results are proved for the secondary measured category. It is also shown that the secondary measured category is a transverse invariant related to the growth of (pseudo)groups. The equality between secondary category and the growth of a group is done in the case of free suspensions by Rohlin groups.
Measurable versions of the LS category on laminations
Carlos Meni?o Cotón
Mathematics , 2011, DOI: 10.1007/s00229-013-0644-8
Abstract: We give two new versions of the LS category for the set-up of measurable laminations defined by Berm\'udez. Both of these versions must be considered as "tangential categories". The first one, simply called (LS) category, is the direct analogue for measurable laminations of the tangential category of (topological) laminations introduced by Colman Vale and Mac\'ias Virg\'os. For the measurable lamination that underlies any lamination, our measurable tangential category is a lower bound of the tangential category. The second version, called the measured category, depends on the choice of a transverse invariant measure. We show that both of these "tangential categories" satisfy appropriate versions of some well known properties of the classical category: the homotopy invariance, a dimensional upper bound, a cohomological lower bound (cup length), and an upper bound given by the critical points of a smooth function.
Tangential category and critical point theory
Carlos Meni?o Cotón
Mathematics , 2012,
Abstract: Classical Ljusternik-Schnirelmann category is upper bounded by the number of critical points of any bounded from below di?erentiable functions of Palais-Smale type. Here we achieve an adaptation of this result for the tangential category of foliations. We introduce a weaker type of Palais-Smale function, obtaining a slight improvement in the classical theorem of critical points.
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