Modern optics is a field which combines basic physics with industrial applications, especially in the domains of telecommunication and sensor development. The grating coupler, an important device of integrated optics, is proposed as a model system. It is particularly appropriate for discussing basic topics such as wave-guiding and diffraction, and can be used for demonstrating important applica...

The quenching factor of the proton recoil in the stilbene scintillator was measured with a 252Cf neutron source and was found to be 0.1 – 0.17 in the recoil energy range between 300 keV and 3 MeV. It was found to depend on the direction of the recoil proton. The directional anisotropy of the quenching factor could be used to detect the wind of the WIMPs caused by the motion of the earth around ...

New, compact multimode interference couplers with tunable power splitting ratios have been realized. Experiments show large tuning ranges. Such couplers are needed to optimize ON–OFF ratios in interferometric devices and may find applications as extremely compact switches.

A bsiract— Two methods for mult ipath combining are compared for rake reception of a CDMA cellular forward-link traffic channel. Combining based on estimation of the signal-to-interference ratio of the output of each tap of the rake receiver is shown to provide significant performance improvement in comparison with the more commonly considered combiner that is based on measurement of the signal...

As deregulation, stew technologies, and new competitors open up the mobile telecommunications industry, churn prediction and management has become of great concern to mobile service providers: A mobile service provider wishing to retain its subscribers needs to be able to predict which of them may be at-risk of changing services and will make those subscribers the focus of customer retention ef...

Combiner and Stacked Generalization are two very similar meta-learning methods that combine predictions of multiple classiiers to improve accuracy of any single classiier. Both methods form a meta-level classiier from meta-data that are predictions of multiple classiiers on the same data items. The diierence between these two approaches lies in the way meta-data is formed. In this paper, we com...

A new broadband in-phase power divider based on multilayer technology is presented. A simple design procedure is developed for the proposed multilayer power divider. An S-band four-way multilayer power divider was designed and measured. The simulated results are compared with the measured data, and good agreement is reported. The measured 15 dB return loss bandwidth is demonstrated to be about ...

A secret sharing scheme is a cryptographic protocol by means of which a dealer shares a secret among a set of participants in such a way that it can be subsequently reconstructed by certain qualiied subsets. The setting we consider is the following: in a rst phase, the dealer gives in a secure way a piece of information, called a share, to each participant. Then, participants belonging to a qua...

The Bayes error provides the lowest achievable error rate for a given pattern classiication problem. There are several classical approaches for estimating or nd-ing bounds for the Bayes error. One type of approach focuses on obtaining analytical bounds, which are both diicult to calculate and dependent on distribution parameters that may not be known. Another strategy is to estimate the class d...