Materialized views defined over distributed data sources are a well recognized technology in data integration, e-business and semantic web. Due to the constantly increasing size of the information sources and the rapid rates of change, there comes an increasing pressure to reduce the time taken for refreshing such integration views. State-of-the-art incremental view maintenance literature requi...

This paper presents axioms for systems of conditional preferences and provides representation results for these systems. It reports on a new way of representing a system of conditional preferences, by means of a system of conditional lexicographic probabilities (SCLP) (cf. Asheim and Perea, Games and Economic Behavior, forthcoming). An SCLP ensures well-defined conditional beliefs representing ...

empirical researches have shown that in highly volatile market, conditional correlation between returns is stronger, so diversification cannot reduce risk. to test this claim in iran’s financial market, quintiles of stock return distribution have been estimated by kernel density and garch models. then, average conditional correlation, error variance and conditional capm has been calculated to t...

the current paper examines intertemporal capital asset pricing model in iran’s stock market. dynamic conditional correlation was used to estimate conditional variance and covariance portfolios with market returns. time varying beta is estimated by kalman filter method. based on the obtained results, risk aversion coefficients were between 0.013 and 0.28 and the average was 0.20. significance of...

Today, neuroscientists are interested in discovering human brain functions through brain networks. In this regard, the evaluation of dynamic changes in functional connectivity of the brain regions by using functional magnetic resonance imaging data has attracted their attention. In this paper, we focus on two model-based approaches, called the exponential weighted moving average model and the d...

it is well-known that “casual conditional” in islamic logics has been used with two meanings: “specific conditional” and “general conditional”. however, viewing the works of the muslim logicians, we find out that these two meanings of “casual conditional” have been interpreted in two various ways: each of the general and specific conditionals is sometimes interpreted as the condition of “non-ne...