as one of the potential ict application areas within organizations, e-learning has come within the sights of organizations for its plethora of possibilities. the most significant feature is that by using leading edge ict, e-learning helps organizations to chart the changes and create a kind of continued educatin within the corporate environment. the present study studies the challanges facing o...

(1964)]. ~J. J. Aubert et a/. , Phys. Rev. Lett. 33, 1404 (1974). 2J.-E. Augustin et al. , Phys. Bev. Lett. 33, 1406 (1974). 3G. S. Abrams et al. , Phys. Bev. Lett. 33, 1453 (1974). A. De R6jula and S. L. Glashow, Phys. Bev. Lett. 34, 46 (1975); T. Appelquist, A. De Rujula, H. D. Politzer, and S. L. Glashow, Phys. Rev. Lett. 34, 365 (1975); S. Borchardt, V. S. Mathur, and S. Okubo, Phys. Rev. L...

P-glycoprotein (P-gp), an ATP-binding cassette, is able to transport structurally and chemically unrelated substrates. Over-expression of P-gp in cancer cells significantly decreases the intercellular amount of anticancer drugs, and results in multidrug resistance in cancer cells, a major obstacle in cancer chemotherapy. P-gp is mainly localized on the plasma membrane and functions as a drug ef...

If we want to understand how perturbations spread across a multi-modal public transportation system, we have to include passenger flows into the model and the analysis. Indeed, in general no two different lines in such a system are physically connected directly, or share tracks or other resources. Rather, they are connected by passengers changing lines and thus transmit perturbations from one l...

There are errors in the author affiliations. The affiliations should appear as shown here: Margaret Addabbo, Elena Longhi, Nadia Bolognini, Irene Senna, Paolo Tagliabue, Viola Macchi Cassia, Chiara Turati 1 Department of Psychology and NeuroMi, Milan Center for Neuroscience, University of Milan-Bicocca, Piazza Ateneo Nuovo 1 (U6), 20126, Milano, Italy, 2 Research Department of Clinical, Educati...

This contribution presents the formalism of Elementary Object Systems (Eos). Object nets are Petri nets which have Petri nets as tokens – an approach known as the nets-within-nets paradigm. One central aim of this contribution is to compile all our previous works dedicated to certain aspects of Eos together with recent yet unpublished results within one selfcontained presentation. Since object ...

Refinement of Petri nets is well suited for the hierarchical design of system models. It is used to represent a model at different levels of abstraction. Usually, refinement is a static concept. For many scenarios, however, it is desirable to have a more flexible form of refinement. For example in the context of service updates, e.g. version control in distributed systems, a mechanism for dynam...