Telcordia Technologies

About: Telcordia Technologies is a based out in . It is known for research contribution in the topics: Network packet & Node (networking). The organization has 3097 authors who have published 4737 publications receiving 237882 citations.

Efficient simulation of finite automata by neural nets

Abstract: Let K(m) denote the smallest number with the property that every m-state finite automaton can be built as a neural net using K(m) or fewer neurons. A counting argument shows that K(m) is at least Ω((m log m)1/3), and a construction shows that K(m) is at most O(m3/4). The counting argument and the construction allow neural nets with arbitrarily complex local structure and thus may require neurons that themselves amount to complicated networks. Mild, and in practical situations almost necessary, constraints on the local structure of the network give, again by a counting argument and a construction, lower and upper bounds for K(m) that are both linear in m.

Perspectives on the History of Glass Composition

Abstract: The 100th anniversary of The American Ceramic Society corresponds approximately with the 100th anniversary of what might be considered the start of the age of glass science, i.e., the publication, in Germany, in 1886, of the catalog of Schott und Genossen, containing 44 optical glass compositions. The American Ceramic Society centennial seems, accordingly, to be an appropriate occasion to examine the history of glass composition that both preceded and followed the seminal work of Schott and to survey some of the major discoveries and changes in glass composition as well as the reasons that led to them. Although it is certainly of interest to consider a more complete history of the glass industry, we have opted to attempt the more modest task just described. The history of glass structure theories is considered, particularly with regard to the effects of composition on structure, and how these relate to glass properties. The article then continues with a discussion of recent special glasses and concludes with a description of lightguide glasses, the discovery of which has changed the nature of glass science and the glass industry.

Spectrally efficient optical CDMA using coherent phase-frequency coding

Abstract: We demonstrate feasibility of a spectrally efficient wavelength-division-multiplexing-compatible optical code-division multiple-access system using 16 phase-locked laser lines within an 80-GHz tunable window as frequency bins and an ultrahigh frequency resolution spectral phase encoder-decoder. Coding and decoding using binary [0, /spl pi/] phase chips were demonstrated for four users at 2.5 Gb/s, and a single coded signal was separated from four copropagating signals, with bit-error rate <10/sup -9/.

Location prediction algorithms for mobile wireless systems

Abstract: Predicting the location of a mobile wireless user is an inherently interesting and challenging problem. Location prediction has received increasing interest over the past decade, driven by applications in location management, call admission control, smooth handoffs, and resource reservation for improved quality of service. It is likely that location prediction will receive even more interest in the future, especially given the increased availability and importance of location estimation hard-ware and applications.In this chapter, we present an overview of location prediction in mobile wireless systems. We do not attempt to provide a comprehensive survey of all techniques and applications, but offer instead a description of several types of algorithms used for location prediction. We classify them broadly into two types of approaches: (1) domain-independent algorithms that take results from Markov analysis or text compression algorithms and apply them to prediction, and (2) domain-specific algorithms that consider the geometry of user motion as well as the semantics of the symbols in the user's movement history. We briefly mention other algorithms using Bayesian or neural network approaches, and end with some concluding remarks.