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Search Results: 1 - 10 of 276 matches for " Yoram Eshet-Alkalai "
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Pedagogical and Design Aspects of a Blended Learning Course
Karen Precel, Yoram Eshet-Alkalai, Yael Alberton
International Review of Research in Open and Distance Learning , 2009,
Abstract: Based on recent research reports, the blended learning model, which combines face-to-face and online learning, is now the preferred model for online course design. Its superiority over online learning, which lacks face-to-face interaction, is evident from studies that examined both student achievement and satisfaction. Nevertheless, there is ambiguity in the literature and in the field regarding the proper implementation of blended learning and the optimal proportions between online and F2F components in various learning scenarios. The range of contradictory reports in recent literature on the potential of different blended learning models shows the need for more research on specific blended learning courses in order to establish proper standards for effective course design and implementation. The present evaluation study focuses on students’ perceptions of pedagogical and design issues related to a new model for blended learning used in a graduate-level course at the Open University of Israel. Fifty-eight of the course’s 91 students participated in the study and completed a questionnaire regarding three major aspects of the course design: (1) pedagogy, (2) textbook format (print vs. digital), and (3) learning environment usability. The results illustrate the importance of completing the pedagogical and visual design of online learning in advance. Also, the course model suggests ways to bridge the gaps between students and instructors and students and their peers, which are typical of online learning in general and of open universities in particular.
Comunica o internacional e intercultural: a luta pelo imaginário social, o temor à segrega o e o caso do terrorismo
Wainberg, Jacques Alkalai
Civitas , 2005,
Abstract: Este trabalho apresenta uma reflex o sobre o fen meno comunica o e suas conex es com as rela es internacionais. Fator dominante do mundo contemporaneo, as comunica es precisam ser pensadas em amplitude maior, percorrendo, aspectos, contatos, universos, áreas e regi es com dimens es antes n o concebida pela disciplina. Nesse sentido, a dinamica do mundo contemporaneo exige que as comunica es precisem ser entendidas em duas dimens es que tem significados e abrangências distintas, mas n o tem sido bem compreendidas pelos estudiosos que as têm confundido, ou a desconsiderado. O problema da comunica o inter-cultural, contudo, precisa ser destrinchado para permitir que as quest es complexas, como o terrorismo, sejam abordadas a partir de perspectiva que tente equacioná-la, pois consegue dar conta de aspectos cruciais como os códigos, o imaginário social, a quest o da segrega o e do temor. Por essa raz o, o presente trabalha toma o terrorismo como um estudo de caso, mostrando como ele pode ser melhor compreendido em fun o do problema das comunica es interculturais.
When the Need for Cognitive Structure does not Cause Heuristic Thinking: The Moderating Effect of the Perceived Ability to Achieve Cognitive Structure  [PDF]
Yoram Bar-Tal
Psychology (PSYCH) , 2010, DOI: 10.4236/psych.2010.12013
Abstract: This research explores the hypothesis that the relationship between need for cognitive structure (NCS) and the use of cognitive biases is moderated by the perceived ability to achieve cognitive structure (AACS). NCS is defined as the extent of preference to use cognitive structuring vs. piecemeal processing as a means to achieve certainty. AACS refers to the extent to which individuals believe that they are able to use information processing processes (cognitive structuring or piecemeal) that are consistent with their level of NCS. To examine this hypothesis, Study 1 explored the effect of the NCS by AACS interaction on the use of confirmation bias. Study 2, demonstrated this effect on the use of framing heuristic. The results of the two studies confirm the hypothesis.
The Electronic Structure of CdSe/CdS Core/Shell Seeded Nanorods: Type-I or Quasi-Type-II?
Hagai Eshet,Michael Grunwald,Eran Rabani
Physics , 2013, DOI: 10.1021/nl402722n
Abstract: The electronic structure of CdSe/CdS core/shell seeded nanorods of experimentally relevant size is studied using a combination of molecular dynamics and semiempirical pseudopotential techniques, with the aim to address the transition from type-I to a quasi-type-II band alignment. The hole is found to be localized in the core region regardless of its size. The overlap of the electron density with the core region depends markedly on the size of the CdSe core: For small cores, we observe little overlap, consistent with type-II behavior. For large cores, significant core-overlap of a number of excitonic states can lead to type-I behavior. When electron-hole interactions are taken into account, the core-overlap is further increased. Our calculations indicate that the observed transition from type-II to type-I is largely due to simple volume effects, and not to band alignment.
Confounding factors affect the pathophysiology of eosinophilic esophagitis
Yoram Elitsur
World Journal of Gastroenterology , 2012, DOI: 10.3748/wjg.v18.i33.4466
Abstract: Eosinophilic esophagitis is a newly diagnosed esophageal disease in adult and children. The clinical and pathological characteristics of this disease have been established and were recently summarized in the expert clinical guideline published in 2011. In spite of the wide knowledge accumulated on this disease, there are many areas where scientific data are missing, especially in regard to the disease’s pathophysiology. Recent publications have suggested that other confounding factors modify the disease and may affect its clinical-phenotypic presentation. Those factors may include place of living, air pollution, race, genetic factors and other. In the present report we discussed and review those confounding factors, the new developments, and what direction we should go to further advance our knowledge of this disease.
Al-Qaeda and Suicide Terrorism: Vision and Reality
Yoram Schweitzer
Military and Strategic Affairs , 2010,
Abstract: Suicide bombings are not a new phenomenon in the annals of contemporary terrorism. What characterizes modern suicide terrorism and sets it apart from suicide attacks carried out from the rst century until the middle of the 20th is that it is perpetrated by means of explosives carried on the suicide attacker’s body or on some type of mobile platform driven by the suicide attacker into his target, which he detonates along with himself. Al-Qaeda adopted the weapon and made it into its trademark. The organization has re ned the technique and given it dramatic signi cance. The way al-Qaeda operates terrorism, with an emphasis on cultivating and disseminating suicide terrorism, derives from its ideological code and its corresponding administrative operational approach. Because al-Qaeda sees itself at the forefront of global jihad and a paragon for its af liates, it seeks to instill among Muslims around the world its militant worldview in general and the proper way to conduct the armed struggle via suicide terrorism in particular.
The Terrorism Threat against Israel from al-Qaeda and Global Jihad
Yoram Schweitzer
Military and Strategic Affairs , 2010,
Abstract: This essay analyzes the current risks to Israel’s interests in Israel and abroad (including Jewish interests abroad) from al-Qaeda and its af liates. To illustrate the risks, it is useful to review the ideology of these groups and show how it translates into practical expression through a survey of the groups’ activities in different arenas around the world.
After Runaway: The Trans-Hill Stage of Planetesimal Growth
Yoram Lithwick
Physics , 2013, DOI: 10.1088/0004-637X/780/1/22
Abstract: When planetesimals begin to grow by coagulation, they enter an epoch of runaway, during which the biggest bodies grow faster than all the others. The questions of how runaway ends and what comes next have not been answered satisfactorily. Here we show that runaway is followed by a `trans-hill stage' that commences once the bodies become trans-hill, i.e. once the Hill velocity of the bodies that dominate viscous stirring matches the random speed of the small bodies they accrete. Subsequently, the small bodies' speed grows in lockstep with the big bodies' sizes, such that the bodies remain in the trans-hill state. Trans-hill growth is crucial for determining the efficiency of growing big bodies, as well as their growth timescale and size spectrum. We work out the properties of trans-hill growth analytically and confirm these numerically. Trans-hill growth has two sub-stages. In the earlier one, collisional cooling is irrelevant, in which case the efficiency of forming big bodies remains very low (0.1% in the Kuiper belt) and their mass spectrum is flat. This explains results from previous coagulation simulations for both the Kuiper belt and the asteroid belt. The second sub-stage commences when small bodies begin to collide with one another. Collisional cooling then controls the evolution, in which case the efficiency of forming big bodies rises, and their size spectrum becomes more top-heavy. Trans-hill growth terminates in one of two ways, depending on parameters. First, mutual accretion of big bodies can become significant and conglomeration proceeds until half the total mass is converted into big bodies. This mode of growth may explain the size distributions of minor bodies in the Solar System, and is explored in forthcoming work. Second, if big bodies become separated by their Hill radius, oligarchy commences. This mode likely precedes the formation of fully-fledged planets.
A rigorous lower confidence bound for the expectation of a positive random variable
Yoram Gat
Mathematics , 2008, DOI: 10.1214/08-EJS308
Abstract: Given an IID sample from a positive distribution, we provide a method for constructing rigorous finite sample lower confidence bounds for the expectation of the distribution. The method is based on constructing rigorous confidence regions for the cdf of the distribution. We provide some analysis of the asymptotical behavior of the rigorous LCBs. We apply the method to obtain an LCB for a particular, controversial, empirical data set, where the validity of standard methods has been called into question.
Switching Portfolios
Yoram Singer
Computer Science , 2013,
Abstract: A constant rebalanced portfolio is an asset allocation algorithm which keeps the same distribution of wealth among a set of assets along a period of time. Recently, there has been work on on-line portfolio selection algorithms which are competitive with the best constant rebalanced portfolio determined in hindsight. By their nature, these algorithms employ the assumption that high returns can be achieved using a fixed asset allocation strategy. However, stock markets are far from being stationary and in many cases the wealth achieved by a constant rebalanced portfolio is much smaller than the wealth achieved by an ad-hoc investment strategy that adapts to changes in the market. In this paper we present an efficient Bayesian portfolio selection algorithm that is able to track a changing market. We also describe a simple extension of the algorithm for the case of a general transaction cost, including the transactions cost models recently investigated by Blum and kalai. We provide a simple analysis of the competitiveness of the algorithm and check its performance on real stock data from the New York Stock Exchange accumulated during a 22-year period.
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