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Search Results: 1 - 10 of 846 matches for " Horesh Dor-Haim "
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Reduced Ventricular Arrhythmogeneity and Increased Electrical Complexity in Normal Exercised Rats
Horesh Dor-Haim, Omer Berenfeld, Michal Horowitz, Chaim Lotan, Moshe Swissa
PLOS ONE , 2013, DOI: 10.1371/journal.pone.0066658
Abstract: Background The mechanisms whereby aerobic training reduces the occurrence of sudden cardiac death in humans are not clear. We test the hypothesis that exercise-induced increased resistance to ventricular tachycardia and fibrillation (VT/VF) involve an intrinsic remodeling in healthy hearts. Methods and Results Thirty rats were divided into a sedentary (CTRL, n = 16) and two exercise groups: short- (4 weeks, ST, n = 7) and long-term (8 weeks, LT, n = 7) trained groups. Following the exercise program hearts were isolated and studied in a Langendorff perfusion system. An S1–S2 pacing protocol was applied at the right ventricle to determine inducibility of VT/VF. Fast Fourier transforms were applied on ECG time-series. In-vivo measurements showed training-induced increase in aerobic capacity, heart-to-body weight ratio and a 50% low-to-high frequency ratio reduction in the heart rate variability (p<0.05). In isolated hearts the probability for VF decreased from 26.1±14.4 in CTRL to 13.9±14.1 and 6.7±8.5% in the ST and LT, respectively (p<0.05). Duration of VF also decreased from 19.0±5.7 in CTRL to 8.8±7.1 and 6.0±5.8 sec in ST and LT respectively (p<0.05). Moreover, the pacing current required for VF induction increased following exercise (2.9±1.7 vs. 5.4±2.1 and 8.5±0.9 mA, respectively; p<0.05). Frequency analysis of ECG revealed an exercise-induced VF transition from a narrow single peak spectrum at 17 Hz in CTRL to a broader range of peaks ranging between 8.8 and 22.5 Hz in the LT group (p<0.05). Conclusion Exercise in rats leads to reduced VF propensity associated with an intrinsic cardiac remodeling related to a broader spectral range and faster frequency components in the ECG.
Can Feedback Increase the Capacity of the Energy Harvesting Channel?
Dor Shaviv,Ayfer Ozgur,Haim Permuter
Mathematics , 2015,
Abstract: We investigate if feedback can increase the capacity of an energy harvesting communication channel where a transmitter powered by an exogenous energy arrival process and equipped with a finite battery communicates to a receiver over a memoryless channel. For a simple special case where the energy arrival process is deterministic and the channel is a BEC, we explicitly compute the feed-forward and feedback capacities and show that feedback can strictly increase the capacity of this channel. Building on this example, we also show that feedback can increase the capacity when the energy arrivals are i.i.d. known noncausally at the transmitter and the receiver.
Mechanism of Discerning Similarities in Psychiatric Diagnoses  [PDF]
Haim Eshach
Creative Education (CE) , 2013, DOI: 10.4236/ce.2013.46A001
Abstract:

Psychiatrists use similarities to make diagnoses in situations where rules are insufficient. The purpose of this study was to examine the criteria psychiatrists use to determine similarity between cases of personality disorder. Psychiatrists were provided with cases and were interviewed according to Kelly’s method. Cognitive science theories were used to explain the criteria identified. Results indicated that similarity decisions include idiosyncratic criteria. These results add to the current understanding of medical problem-solving processes and have implications for medical education.

The People's or the World's: RMB Internationalisation in Longer Historic Perspective
Niv Horesh
Economics Research International , 2011, DOI: 10.1155/2011/161074
Abstract: Prognoses of China's currency—Renminbi or RMB in short—going global have become a hotly debated topic in the economic and popular literature of late. While some analysts are tipping a gradual transformation of the RMB into the world's next principal reserve currency in lieu of the US$, others contend that the deficiencies of China's financial market will continue to preclude any such transformation for a long time to come. The aim of this paper is to survey the arguments put forward by either camp and to weigh into this debate not only through the prism of applied economic theory or political economy but also through the prism of economic history.
Location Is (Not) Everything: Re-Assessing Shanghai’s Rise, 1840s -1860s
Niv Horesh
Provincial China , 2009,
Abstract: While Shanghai’s pre-war history (1842-1937) is thought to be already ‘quite well understood’ thanks to an inordinately large number of studies, other Chinese urban centres received less attention. Consequently, a number of Western scholars have recently shifted their gaze elsewhere in search of other Chinese articulations of modernity. Yet a thorough examination of the history of other Chinese cities cannot replace a continual robust engagement with Shanghai. This is not least because the vast array of materials available at the Shanghai Municipal Archives and Zikawei Library has been systematically catalogued only over the last few years. They are indispensable to understanding the city’s rise to prominence and its preponderant position within China’s economic modernisation process. Mainly drawing on rare early editions of the North-China Herald held at the Zikawei Library, this article highlights one aspect of Shanghai’s early treaty-port development; it reprises the conventional wisdom positing that, because of its perceived advantageous location, Shanghai had been almost deterministically poised to become China’s gateway to the outside world following the First Opium War (1839-1842). Instead, it argues that location was significant but not sufficient of itself in delivering Shanghai’s economic take-off.
From Chengdu to Stockholm: A Comparative Study of the Emergence of Paper Money in East and West
Niv Horesh
Provincial China , 2012,
Abstract: It is widely recognised that monetary paper instruments appeared in China earlier than in the West, paper itself having been invented there during the Han era. However, there have been to date few direct scholarly attempts to place the early-modern Western and pre-modern Chinese formative experiences with paper money in detailed comparison by way of attaining a better understanding of the evolution of money as a whole. This article aims to make a tentative first step toward bridging this scholarly gap. It will survey in particular the extent to which the inception of Chinese paper money in 11th-century Chengdu differed from the circumstances in which European paper money emerged. Whilst some similarity between 17th-century Stockholm and 11th-century Chengdu might arguably be traced back insofar as the emergence of paper money is concerned, British banknote issuance subsequently took on new important functions. These, in turn, ushered in our modern "national-debt" economy.
Shanghai Studies: An Analysis of Principal Trends in the Field
Niv Horesh
Provincial China , 2010,
Abstract: This article is aimed at critically reviewing recent principal trends in the study of pre-war Shanghai (1843-1937). It will point in passing to attitudinal changes with regard to the city's past in the PRC academic discourse, but will critique in the main influential English-language monographs that have appeared in the last two decades. Cognizant of social realities in present-day Shanghai, the following passages re-visit themes such as sub-ethnicity, networking, nationalism, urban governance, institutions and the public sphere before 1937. Throughout, gaps in the existing literature will be systematically underscored with a view toward setting forth a research agenda for the future.
The People's or the World's: RMB Internationalisation in Longer Historic Perspective
Niv Horesh
Economics Research International , 2011, DOI: 10.1155/2011/161074
Abstract: Prognoses of China's currency—Renminbi or RMB in short—going global have become a hotly debated topic in the economic and popular literature of late. While some analysts are tipping a gradual transformation of the RMB into the world's next principal reserve currency in lieu of the US$, others contend that the deficiencies of China's financial market will continue to preclude any such transformation for a long time to come. The aim of this paper is to survey the arguments put forward by either camp and to weigh into this debate not only through the prism of applied economic theory or political economy but also through the prism of economic history. 1. Introduction The need to approach the issue of RMB internationalisation from fresh perspectives may perhaps be partly vindicated by what Wu et al. identify as the inevitable “paucity” of empirical analyses [1]. Equally compelling, however, is the fact that much of what has already been written on this issue is predicated on the fairly recent historic experience of the onset of the pound sterling and US$ through the 20th century, and on the still more recent experience of the Euro in the early 21st century. (See, e.g., Hefeker and Nabor [2].) Implicitly, therefore, the prospects of RMB internationalisation are assessed based on indicators of convergence between the Chinese economy at present, and the British, American, Japanese, or EU economies in recent decades. But such an analytical framework, when removed from the broader historic context, might of itself rule out a more distinct Chinese path to global economic eminence—one where, for example, the depth of domestic capital markets might not turn out to be a critical determinant of RMB internationalisation as was the case in the Anglo-American development trajectory. The following historic survey can perhaps shed light on current debates about the future role of RMB in at least one way: they remind us that the prospect of Chinese currency used as international currency may not be entirely new. For even though traditionally cast Chinese copper coinage was swept aside by Western steam-powered minting technology in the late 19th century, it had for a millennium or so prior set the benchmark for East and Southeast Asian monetization. As China was phasing out traditional copper coinage—known as caixa or “cash” to Europeans—Chinese indentured labourers were still taking it with them aboard British ships sailing across the South Pacific to serve as token currency for gambling and grocery purposes [3]. The analysis offered below explores what might inspire a
Hedging with Stock Index Options: A Mean-Extended Gini Approach  [PDF]
Haim Shalit, Doron Greenberg
Journal of Mathematical Finance (JMF) , 2013, DOI: 10.4236/jmf.2013.31011
Abstract:

One of the more efficient methods to hedge portfolios of securities whose put options are not traded is to use stock index options. We use the mean-extended Gini (MEG) model to derive the optimal hedge ratios for stock index options. We calculate the MEG ratios for some main stocks traded on the Tel Aviv Stock Exchange and compare them to the minimum-variance hedge ratios. Computed for specific values of risk aversion, MEG hedge ratios combine systematic risk with basis risk. Our results show that increasing the risk aversion used in the computation reduces the size of the hedge ratio, implying that less put options are needed to hedge away each and every security.

Separation Surfaces in the Spectral TV Domain for Texture Decomposition
Dikla Horesh,Guy Gilboa
Mathematics , 2015,
Abstract: In this paper we introduce a novel notion of separation surfaces for image decomposition. A surface is embedded in the spectral total-variation (TV) three dimensional domain and encodes a spatially-varying separation scale. The method allows good separation of textures with gradually varying pattern-size, pattern-contrast or illumination. The recently proposed total variation spectral framework is used to decompose the image into a continuum of textural scales. A desired texture, within a scale range, is found by fitting a surface to the local maximal responses in the spectral domain. A band above and below the surface, referred to as the \textit{Texture Stratum}, defines for each pixel the adaptive scale-range of the texture. Based on the decomposition an application is proposed which can attenuate or enhance textures in the image in a very natural and visually convincing manner.
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