919 research outputs found
Linear Bandits with Feature Feedback
This paper explores a new form of the linear bandit problem in which the
algorithm receives the usual stochastic rewards as well as stochastic feedback
about which features are relevant to the rewards, the latter feedback being the
novel aspect. The focus of this paper is the development of new theory and
algorithms for linear bandits with feature feedback. We show that linear
bandits with feature feedback can achieve regret over time horizon that
scales like , without prior knowledge of which features are relevant
nor the number of relevant features. In comparison, the regret of
traditional linear bandits is , where is the total number of
(relevant and irrelevant) features, so the improvement can be dramatic if . The computational complexity of the new algorithm is proportional to
rather than , making it much more suitable for real-world applications
compared to traditional linear bandits. We demonstrate the performance of the
new algorithm with synthetic and real human-labeled data
Pacemaker endocarditis due to Haemophilus parainfluenza : case report and literature review
This article reports a case of pacemaker infective endocarditis in a 14 month old girl, caused
by Haemophilus parainfluenzae. There are no other cases in children reported in the
literature. The issues surrounding the case and the evidence which
influenced the management are discussedpeer-reviewe
Investigation of different dielectric materials as gate insulator for MOSFETs
The scaling of semiconductor transistors has led to a decrease in thickness of the silicon dioxide layer used as gate dielectric. The thickness of the silicon dioxide layer is reduced to increase the gate capacitance, thus increasing the drain current. If the thickness of the gate dielectric decreases below 2nm, the leakage current due to the tunneling increases drastically. Hence it is necessary to replace the gate dielectric, silicon dioxide, with a physically thicker oxide layer of high-k materials like Hafnium oxide and Titanium oxide. High-k dielectric materials allow the capacitance to increase without a huge leakage current. Hafnium oxide and Titanium oxide films are deposited by reactive magnetron sputtering from Hafnium and Titanium targets respectively. These oxide layers are used to create metal-insulator-metal (MIM) structures using aluminum as the top and bottom electrodes. The films are deposited at various O2/Ar gas flow ratios, substrate temperatures, and process pressures. After attaining an exact recipe for these oxide layers that exhibit the desired parameters, MOS capacitors are fabricated with n-Si and p-Si substrates having aluminum electrodes at the top and bottom of each. Comparing the parameters of Hafnium oxide- and Titanium oxide- based MOS capacitors, MOSFET devices are designed with Hafnium oxide as gate dielectric
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A non-archimedean definable Chow theorem
Peterzil and Starchenko have proved the following surprising generalization
of Chow's theorem: A closed analytic subset of a complex algebraic variety that
is definable in an o-minimal structure, is in fact an algebraic subset. In this
paper, we prove a non-archimedean analogue of this result.Comment: 30 pages. Comments are welcome
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