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.

Apparatus and method for internet telephony routing

Abstract: An apparatus and method for automatically designating a telephone call route through a telephone network (316) including a circuit switched telephone network (322) and a packet switched network (324), such as the Internet. The method includes the steps, executed by a network element (404), of receiving a telephone number corresponding to a called party receiving the telephone call (702), reviewing preference information pertaining to a calling party's telephone service (704), determining from the preference information (406) and the telephone number whether the telephone call (402) can be routed to the called party through the packet switched network (706), and assigning a route for the telephone call through one of either the packet switched network or the STN to the called party based on whether the call is routable through the packet switched network (708). A network element (404) includes the databases and call processing records necessary to route a call and perform these steps.

Automatic management of network security policy

Abstract: The paper describes work in our project funded by the DARPA Dynamic Coalitions program to design, develop, and demonstrate a system for automatically managing security policies in dynamic networks. Specifically, we aim to reduce human involvement in network management by building a practical network reconfiguration system so that simple security policies stated as positive and negative invariants are upheld as the network changes. The focus of this project is a practical tool to help systems administrators verifiably enforce simple multi-layer network security policies. Our key design considerations are computational cost of policy validation and the power of the enforcement primitives. The central component is a policy engine populated by models of network elements and services that validates policies and computes new configuration settings for network elements when they are violated. We instantiate our policy enforcement tool using a monitoring and instrumentation layer that reports network changes as they occur and implements configuration changes computed by the policy engine.

High efficiency coder and method employing overlapped motion compensation and perfect reconstruction filter banks

Abstract: Our overlapped motion compensation unit and method, which is a motion compensation mechanism employing an overlapped block structure, minimize blocking effects prevalent in convention motion compensation. Our overlapped motion compensation unit and method are implemented on the basis of analysis/synthesis filter banks employed for coding resulting in compatibility between the block structure used for motion compensation and for coding. Our encoder, decoder, and coding method employ our novel overlapped motion compensation technique in combination with analysis/synthesis filter banks such as LOT to achieve improvements in coding efficiency and image quality above that of conventional image coders and coding methods. Specifically, in our encoder, decoder, and coding method, blocking effects prevalent in coders employing conventional motion compensation techniques and discrete cosine transforms are minimized and coding efficiency and image quality are maximized.

Solid-phase regrowth of compound semiconductors by reaction-driven decomposition of intermediate phases

Abstract: The solid-phase epitaxial regrowth of a III–V compound semiconductor by a two-stage reaction between a two-layer metallization and a compound semiconductor substrate is described The regrowth process begins with a low-temperature reaction between a metal M (eg Ni, Pd, or Pt) and a compound semiconductor substrate, AB, to produce an intermediate M, AB or MB, phase A subsequent reaction at a higher temperature between an overlayer of Si, Ge, Al, or In and the intermediate phase results in the decomposition of the intermediate phase and the epitaxial regrowth of a layer of the compound semiconductor This regrowth mechanism is verified experimentally for the specific case of the Si/Ni/GaAs system Rutherford backscattering spectrometry and transmission electron microscopy data show that the ternary phase Nix GaAs, formed during the initial stage of the reaction, decomposes toNiSi and GaAs by reaction with the Si overlayer The incorporation of the overlayer element into the regrown semiconductor layer is proposed as a mechanism to explain the formation of Ohmic contacts in Si/Pd/n-GaAs, In/Pd/n-GaAs, In/Pt/n-GaAs, and similar two-layer metallization systems on n-GaAs

Object-Oriented Client/Server Internet Environments

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