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.

Packing directed circuits fractionally

Abstract: LetG be a digraph, and letk≥1, such that no “fractional” packing of directed circuits ofG has value >k, when every vertex is given “capacity” 1. We prove there is a set ofO (k logk logk) vertices meeting all directed circuits ofG.

Optical wave breaking of pulses in nonlinear optical fibers

Abstract: A new effect appears in femtosecond optical pulse compression, using single-mode fibers, that we describe as optical wave breaking. In the fiber, frequency-shifted light in the leading and trailing edges of a pulse overtakes unshifted light in the pulse tails. Mixing of these overlapping frequency components generates sidelobes on the pulse spectrum. The effect often leads to computational instabilities, but careful numerical simulations, including fiber loss, give results in excellent agreement with experiment.

Picosecond pulse shaping by spectral phase and amplitude manipulation.

Abstract: The temporal profile of ultrashort optical pulses may be tailored by physically manipulating the phase and the amplitude of frequency components that are spatially dispersed within a grating pulse compressor. Arbitrary pulse shapes may be synthesized subject only to the usual restrictions imposed by finite bandwidth and spatial resolution. We demonstrate this technique by generating a burst of evenly spaced picosecond pulses, a pulse doublet with odd field symmetry, and a burst of evenly spaced pulse doublets with odd field symmetry.

Method for the secure distribution of electronic files in a distributed environment

Abstract: A process for using a trusted third party to create an electronic certificate for an electronic file that can be used to establish the file and verify the identity of the creator of the file. The process is composed of two phases, a registration phase and an electronic file distribution phase. In the registration phase, a trusted third party receives information about an author, including the author's public key and affirmatively verifies the accuracy of this information. In the file distribution phase, an author sends to the trusted third party a signed message containing the hash of the file the author wants to distribute. The trusted third party creates an electronic certificate, signed by the trusted third party, containing the hash of the file sent by the author. A user desiring to receive the file, retrieves the file with the certificate an uses the certificate to verifies, first, that the certificate was created by the trusted third party, and, second, that the hash of the file in the certificate is the same as the hash that is computed from the retrieved file. If these two hash's match, then the user is assured that the file did originate with the author and is uncorrupted.

Individual Differences In Human-Computer Interaction

Abstract: Publisher Summary This chapter focuses on individual differences in human–computer interaction. Differences among users have not been a major concern of commercial computer interface designers. Even behavioral scientists usually select narrowly defined user samples to minimize experimental error when comparing the mean performance of different systems. Those behavioral studies that have analyzed differences among users often have produced descriptive results rather than prescriptions for interface design. In the future, interface designers should focus a great deal of attention on the differences among potential users for three reasons. First, individual differences usually play a major role in determining whether humans can use a computer to perform a job effectively. Second, personnel selection testing, the standard solution to problems of job-related individual differences, cannot be applied to many settings where humans interact with computers. The third reason for designers to be concerned with individual differences is that the technology has reached the point where it is possible to accommodate more user differences.