Agency: Cordis | Branch: FP7 | Program: MC-IRSES | Phase: FP7-PEOPLE-2012-IRSES | Award Amount: 222.00K | Year: 2013
The Fregean-inspired Principle of Compositionality of Meaning (PoC), for formal languages, may be construed as asserting that the meaning of a compound expression is deterministically (and often recursively) analysable in terms of the meaning of its constituents, taking into account the mode in which these constituents are combined so as to form the compound expression. From a logical point of view, this amounts to prescribing a constraint --that may or may not be respected-- on the internal mechanisms that build and give meaning to a given formal system. Within the domain of formal semantics and of the structure of logical derivations, PoC is often directly reflected by metaproperties such as truth-functionality and analyticity, characteristic of computationally well-behaved logical systems. The project GeTFun aims at being a coordinated exchange programme for the investigation of compositional meaning in logic and applications. The consortium will study various well-motivated ways in which the attractive properties and metaproperties of truth-functional logics may be stretched so as to cover more extensive logical grounds. The ubiquity of non-classical logics in the formalization of practical reasoning demands the formulation of more flexible theories of meaning and compositionality that allow for the establishment of coherent and inclusive bases for their understanding. Such investigations presuppose not only the development of adequate frameworks from the perspectives of Model Theory, Proof Theory and Universal Logic, but also the construction of solid bridges between the related approaches based on various generalizations of truth-functionality. Applications of broadly truth-functional logics, in their various guises, are envisaged in several areas of computer science, mathematics, philosophy and linguistics, where the ever increasing complexity of systems continuously raise new and difficult challenges to compositionality.
Braunstein-Bercovitz H.,The Academic College of Tel-Aviv-Yaffo
International Journal of Stress Management | Year: 2013
The purpose of the current study was to examine a theoretically-based multidimensional model, delineating the nature of the associations between perceived gain of three types of organizational resources and burnout, through the mediation of various dimensions of the work-family conflict (WFC). A sample of 179 mothers of young children, holding demanding careers (hospital nurses) completed several questionnaires. Consistent with the Conservation of Resources theory, structural equation modeling analysis (X2 = 9.24, df = 5, NFI = .93, CFI= .94, TLI = .90, and SRMR = .066) indicated that personal-empowerment (e.g., enhanced self-esteem and a sense of mastery and autonomy) and a supportive work-family culture at the workplace are negatively associated with burnout (β = .32, -.17). The relationship between personalempowerment and burnout was fully mediated by the strain-based source of both work interferes with family and family interferes with work dimensions of the conflict (β = -.18, -.15). These results imply that personal-empowerment may augment resiliency and general resistance to stressors, as it attenuates strain spillover from the work to the family domains, as well as from the family to the work domains. The relationship between a supportive work-family culture and burnout was fully mediated by the work interferes with family dimension (both strain- and time-based sources). However, reduced workload (in terms of sufficient time and space) was excluded from the final model, as it did not contribute to reduced WFC and burnout, above the contribution of the other resourcetypes. Implications for career planning and organizational change processes are discussed. © 2013 American Psychological Association.
Arieli O.,The Academic College of Tel-Aviv-Yaffo
Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) | Year: 2013
In this paper we propose a new presentation of logic-based argumentation theory through Gentzen-style sequent calculi. We show that arguments may be represented by Gentzen-type sequents and that attacks between arguments may be represented by sequent elimination rules. This framework is logic-independent, i.e., it may be based on arbitrary languages and consequence relations. Moreover, the usual conditions of minimality and consistency of support sets are relaxed, allowing for a more flexible way of expressing arguments, which also simplifies their identification. This generic representation implies that argumentation theory may benefit from incorporating techniques of proof theory and that different non-classical formalisms may be used for backing up intended argumentation semantics. © 2013 Springer-Verlag.
Ben-Amram A.M.,The Academic College of Tel-Aviv-Yaffo
Logical Methods in Computer Science | Year: 2011
Size-Change Termination (SCT) is a method of proving program termination based on the impossibility of infinite descent. To this end we use a program abstraction in which transitions are described by monotonicity con-straints over (abstract) variables. When only constraints of the form x > y' and x ≥ y' are allowed, we have size-change graphs. In the last decade, both theory and practice have evolved significantly in this restricted framework. The crucial underlying assumption of most of the past work is that the domain of the variables is well-founded. In a recent paper I showed how to extend and adapt some theory from the domain of size-change graphs to general monotonicity constraints, thus complementing previous work, but remaining in the realm of well-founded domains. However, monotonicity constraints are, interestingly, capable of proving termination also in the integer domain, which is not well-founded. The purpose of this paper is to explore the application of monotonicity constraints in this domain. We lay the necessary theoretical foundation, and present precise decision procedures for termination; finally, we provide a procedure to construct explicit global ranking functions from monotonicity constraints in singlyexponential time, and of optimal worst-case size and dimension (ordinal). © A. M. Ben-Amram.
Einat H.,The Academic College of Tel-Aviv-Yaffo
Harvard Review of Psychiatry | Year: 2014
There is a well-known deficiency in valid animalmodels for bipolar disorder. Developing the single idealmodel for the disorder-one that will represent its full scope-will probably not be possible until we have a much better understanding of the underlying pathology. Yet, intermediatemodels, even with partial validity, are critical in order to advance our knowledge and put us into position to develop even better models. The present article discusses the various efforts under way to develop the best models based on our current level of understanding. These efforts include (1) identifying new tests, (2) developing models based on the endophenotypes approach, (3) identifying the best rodent strains, (4) identifying the most appropriate species, (5) segregating susceptible versus resilient animals, and (6) segregating animals that respond or do not respond to treatment. It is suggested that a combined approach that includes these directions and others can result in better models with higher validity that will offer significant help in advancing research on bipolar disorder and developing new and better treatments. © 2014 President and Fellows of Harvard College.
Saabni R.,The Academic College of Tel-Aviv-Yaffo
Proceedings of the International Conference on Document Analysis and Recognition, ICDAR | Year: 2013
In this paper we use the Earth Movers Distance (EMD) algorithm to measure similarity between shapes for recognizing and searching Arabic words. We have used the Shape Context and the Angular Radial Partitioning descriptors to evaluate matching and recognizing with EMD. Based on the encouraging results of high accuracy and recall, we follow the low-distortion embedding of the Earth Mover's Distance to map the shapes in the database under the EMD distance, into a normed space of wavelet coefficients as differences of coefficients histograms. The approximate k-nearest neighbors in the database of the embedded shapes are retrieved in sub linear time using a Locality-Sensitive Hashing (LSH) and generate a short list of candidates. This short list of candidates is used in a filter and refine strategy and the exact results are achieved using the original EMD on this short list. We demonstrate our method on the MNIST dataset and the freely available Arabic Printed Text Image (APTI) database. Our method achieves a speedup of 4 orders of magnitude over the exact method, at the cost of only a 2.4% reduction in accuracy. © 2013 IEEE.
Rymon D.,The Academic College of Tel-Aviv-Yaffo
Acta Horticulturae | Year: 2011
The recent global trend of increased demand for pomegranates, whether as fresh fruit or as derived products, is growing at an impressive pace. It is considered to be the outcome of the many favorable effects on human health these products were found to possess. The global published information on production and trade of pomegranates and the fruit's derivatives offers only an indistinct picture. This is due to the garden character of production in the leading producing countries (India, China and Iran). Often fruit is harvested from small, scattered plots with only a small number of trees. The fact that less than 10% of total production enters international trade exposes the industry to potential serious fluctuations: it is easy to significantly change the relative quantity entering trade by diverting even a small portion of production from domestic consumption to the international marketplace. The lecture presents the global distribution of the sources of supply. As a supplement, seasonal production is portrayed so that general supply is broken down by countries and months. Initially, we define the product "pomegranate" in those markets where the highest prices are obtained. The fruit is characterized by high variability, hence the definition is important. Cultivars, appearance, internal features (color, taste, softness of seeds, etc.) and other characteristics all cover a broad range. An important aspect of this market is the seasonal breakdown of the supply features, including prices determined, quantities supplied and their trends. In modern marketing the market favors brands and efficient positioning of a product. Among the famous brands in the pomegranate industry, the Californian line "POM Wonderful" - and the European juice "Pomegreat" are analyzed. It is of value to note - in addition to the fame, prices and reputation of these brands - the investment which has been needed to achieve their success stories. As an outcome of the previously presented characteristics of the market and the marketing of pomegranates and their derived products, an attempt is made to forecast the market situation for the coming years. The expectations are subjective and exposed to future general economic developments in both the western world, (North America, Europe and Japan) and the two giants - China and India.
Akavia A.,The Academic College of Tel-Aviv-Yaffo
IEEE Transactions on Information Theory | Year: 2014
We present a deterministic algorithm for finding the significant Fourier frequencies of a given signal f ∈ C N and their approximate Fourier coefficients in running time and sample complexity polynomial in N, L1(f̂)/||f̂2, and 1/τ , where the significant frequencies are those occupying at least a τ-fraction of the energy of the signal, and L1(f̂) denotes the L1-norm of the Fourier transform of f. Furthermore, the algorithm is robust to additive random noise. This strictly extends the class of compressible/Fourier sparse signals efficiently handled by previous deterministic algorithms for signals in CN. As a central tool, we prove there is a deterministic algorithm that takes as input N , ε and an arithmetic progression P in ZN, runs in time polynomial in ln N and 1/ε, and returns a set AP that ε-approximates P in ZN in the sense that equation presented}. In other words, we show there is an explicit construction of sets AP of size polynomial in ln N and 1/ε that ε-approximate given arithmetic progressions P in ZN. This extends results on small-bias sets, which are sets approximating the entire domain, to sets approximating a given arithmetic progression; this result may be of independent interest. © 1963-2012 IEEE.
Ben-Amram A.M.,The Academic College of Tel-Aviv-Yaffo
Logical Methods in Computer Science | Year: 2010
Size-Change Termination (SCT) is a method of proving program termination based on the impossibility of infinite descent. To this end we may use a program abstraction in which transitions are described by monotonicity constraints over (abstract) variables. Size-change graphs are a subclass where only constraints of the form x > y′ and x ≥ y′ are allowed. Both theory and practice are now more evolved in this restricted framework than in the general framework of monotonicity constraints. This paper shows that it is possible to adapt and extend some theory from the domain of size-change graphs to the general case, thus complementing previous work on monotonicity constraints. In particular, we present precise decision procedures for termination; and we provide a procedure to construct explicit global ranking functions from monotonicity constraints in singly-exponential time, which is better than what has been published so far even for size-change graphs. © Ben-Amram.
Agency: Cordis | Branch: FP7 | Program: MC-IRG | Phase: FP7-PEOPLE-2009-RG | Award Amount: 100.00K | Year: 2010
One of the most significant and dangerous social and public health problem facing adolescents today is sleep loss. Chronic partial sleep deprivation has achieved epidemic proportions in youth, with approximately 80% of teens not getting the needed amount of nightly sleep. Despite the alarmingly high rates of sleep deprivation in teens, its impact on daytime function, including sleepiness, mood, and cognition remain poorly understood. To address this knowledge gap, we intend to examine sleep, neuropsychological (NP) performance, and mood in the natural environment in 40 healthy adolescents (ages 16-18; 50% female). Each teen will undergo 2 different sleep conditions: 1) an extended sleep period consisting of 5 consecutive days of 10-10.5 hrs in bed/night; and 2) a typical sleep period consisting of 5 consecutive days of 7.5-8.0 hrs in bed/night (the common sleep duration for this age group). The former will provide sleep satiation or optimal biological sleep need (for this age group), while the latter will result in an insufficient amount of sleep. Each teen will be randomly assigned to one of the sleep conditions, followed by a 2-week recovery period, and then the other sleep condition. Sleep testing will include continuous actigraphic monitoring throughout each sleep protocol and one overnight polysomnography recording at the beginning of the study to rule out any sleep disorders. Following the last night of each sleep condition, teens will undergo a battery of standardized NP tests to examine performance in cognitive areas previously found to be related sleep deprivation, including verbal learning, memory, processing speed and attention, inhibition, working memory, and executive function. Findings will increase our knowledge of the correlates of sleep loss in teens and will be useful public policy and education data. Furthermore, it will allow the researcher the opportunity to continue her line of research and reintegrate into the host country.