Single and Multi-Dimensional Optimal Auctions - A Network Approach

This paper highlights connections between the discrete and continuous approaches to optimal auction design with single and multi-dimensional types. We provide an interpretaion of an optimal auction design problem in terms of a linear program that is an instance of a parametric shortest path problem on a lattice. We also solve some cases explicitly in the discrete framework.Auctions, Networks, Linear Programming

Dominant Strategy Mechanisms with Multidimensional Types

This paper provides a characterization of dominant strategy mechanisms with quasi-linear utilities and multi-dimensional types for a variety of preference domains. These characterizations are in terms of a monotonicity property on the underlying allocation rule.Dominant Strategy, Farkas Lemma, Combinatorial Auctions.

Fabrication and Characterization of Mg- and Hg-doped CdS Nanostructured Thin Films Deposited by Chemical Bath Deposition

In this paper we report the preparation of Hg- and Mg-doped nanostructured CdS thin films deposited on commercial glass slide substrate by chemical bath deposition technique at room temperature. The asdeposited doped CdS nanostructured thin films were characterized using X-ray diffractometer, SEM and UV-VIS spectrophotometer. The SEM micrographs confirmed the formation of doped CdS thin film with nano-structured morphologies. The EDX studies confirm chemical composition of Hg- and Mg-doped nanostructured CdS thin films.The XRD studies confirmed the crystalline nature of thin films and nanostructured behavior. The optical studies reveal the optical energy bandgap of 3.82eV(12hrs) & 3.74eV(24hrs) and 3.59 (12hrs) & 3.22eV (24hrs) for Mg-doped CdS and Hg-doped CdS nanostructured thin films respectively. Blue shift was observed in both the doped CdS nanostructured thin films

Fabrication and Characterization of Mg- and Hg-doped CdS Nanostructured Thin Films Deposited by Chemical Bath Deposition

In this paper we report the preparation of Hg- and Mg-doped nanostructured CdS thin films deposited on commercial glass slide substrate by chemical bath deposition technique at room temperature. The asdeposited doped CdS nanostructured thin films were characterized using X-ray diffractometer, SEM and UV-VIS spectrophotometer. The SEM micrographs confirmed the formation of doped CdS thin film with nano-structured morphologies. The EDX studies confirm chemical composition of Hg- and Mg-doped nanostructured CdS thin films.The XRD studies confirmed the crystalline nature of thin films and nanostructured behavior. The optical studies reveal the optical energy bandgap of 3.82eV(12hrs) & 3.74eV(24hrs) and 3.59 (12hrs) & 3.22eV (24hrs) for Mg-doped CdS and Hg-doped CdS nanostructured thin films respectively. Blue shift was observed in both the doped CdS nanostructured thin films

Calibrated Learning and Correlated Equilibrium

Suppose two players repeatedly meet each other to play a game where: 1. each uses a learning rule with the property that it is a calibrated forecast of the other\u27s plays, and 2. each plays a myopic best response to this forecast distribution. Then, the limit points of the sequence of plays are correlated equilibria. In fact, for each correlated equilibrium there is some calibrated learning rule that the players can use which results in their playing this correlated equilibrium in the limit. Thus, the statistical concept of a calibration is strongly related to the game theoretic concept of correlated equilibrium

Diurnal and seasonal variations of <i>hm</i>F2 deduced from digitalionosonde over New Delhi and its comparison with IRI 2001

International audienceUsing digital ionosonde observations at a low mid-latitude station, New Delhi (28.6°N, 77.2°E, dip 42.4°N), we have derived hourly monthly values of hmF2 (the real height corresponding to the peak electron density in the F2-region), employing both the Dudeney (1983) and Bilitza (1990) empirical formulations for the period from January 2001 to August 2002. The diurnal and seasonal variations of hmF2 are analyzed. Further, to assess the predictability of the latest available model, International Reference Ionosphere, (IRI-2001), we have obtained the median values of hmF2 derived from M(3000)F2 for each hour during different seasons and compare these with the model. Our results show that both the Dudeney (1983) and Bilitza (1990) formulations reveal more or less a similar diurnal trend of hmF2, with higher values around midnight and lower during sunrise, in all the seasons. It is also noted that the hmF2 shows a larger variability around midnight than by daytime, in all the seasons. Further, the study shows that median values of observed hmF2, using both formulations, are somewhat larger than those predicted by the IRI, in all seasons and at all local times. During summer, the IRI values agree comparatively well with the observations, especially during daytime. Major discrepancies occur when the IRI underestimates observed hmF2 for local times from about 14:00 LT to 18:00 LT and 04:00 LT to 05:00 LT during winter and equinox, where the percentage deviation of the observed hmF2 values with respect to the IRI model varies from 15 to 25%. The difference between the model and observations, outside this time period, remains less than 20% during all the seasons. Key words. Ionosphere (modelling and forecasting; equatorial ionosphere