Learning systems in dynamic environments have to be able to process examples that occurred in different hidden contexts. We review several approaches to hidden context aware concept learning systems and question the appropriateness of the Calendar Apprentice domain as a real world benchmark for hidden context aware learning systems. By providing a simple lower error bound for batch learning sys...

This paper proposes a thermal study of the catenary/pantograph interface for a train in motion. A 2.5D complex model of the pantograph strip has been defined and created by a coupling between a 1D and a 2D model. Experimental and simulation results are presented and with a comparison allow validating the 2.5D model. Some physical phenomena are described and presented with the help of the model ...

0. Introduction When the Handbook of Integer Sequences came out in 1973, Philip Morrison gave it an enthusiastic review in the Scientific American and Martin Gardner was kind enough to say in hisMathematical Games column for July 1974 that “every recreational mathematician should buy a copy forthwith.” That book contained 2372 sequences. Today the On-Line Encyclopedia of Integer Sequences (or O...

These computational models are at the core of collisional plasma theories. In particular we will discuss several aspects of conservative solvers for the kinetic transport equations of particle interactions that involve either linear or non-linear Boltzmann as well as the non-linear Landau equations, by means of stagger conservative DG schemes for the transport part and DG or spectral solvers fo...

Energy Efficiency and low latency are considered to be most important performance metrics for the performance of Wireless Sensor Networks. Communication is a big part of energy consumption and MAC protocols directly control this communication. In this paper the comparison has been carried out between two MAC protocols LL MAC protocol and a new sleep schedule Q-MAC protocol. Both QMAC and LLMAC ...

in this paper the effects of transmittance, dispersion angle and diffusion length on the quantum efficiency of solar cells (qesc) have been simulated and investigated. optical path technic is used for simulation. the results show that base thickness, diffusion length, dispersion angle, number of optical confinement path and transmission angles have an extremely effects on the qesc. simulation r...

While research supports later start times for secondary schools, there is little evidence regarding elementary schools. We address this gap with a statewide examination of schools and quasi-experimental analysis an urban district that recently changed its times. find earlier predict less sleep students. Regarding academic outcomes, our estimates are small in magnitude suggest have near-zero eff...