Workload Characterization in PBX Performance Studies

  • Karlsson M.
  • Kaufman J.
  • Willie J.

Performance studies during the development cycle of a switching system may be used to predict system capacity, compare and contrast architectural, refine ad hoc scheduling decisions and estimate the impact of new services. Studies of this kind usually employ queueing models because essential performance questions are intimately related to contention ...

Interferometric Characterization of a Biconic Fiber Optic Connector Sleeve

  • Darden B.
  • Saunders M.

SUMMARY: An interferometric method is described for measuring the absolute value of the biconic sleeve end separation of the master sleeve used to determine the suitability of plastic product sleeves. The end separation, g sub 2, is defined as the outermost distance between two truncated balls of a particular diameter ...

Duplex Coatings for the Protection of Magneto - Optic Alloys Against Oxidation and Corrosion

  • Frankenthal R.

Thin films of Fe or Co and rare-earth metals, such as Tb and Gd, are being developed as high density, mass memory storage media in magneto- optic devices. It is shown that a 10 nm duplex film consisting of a metal that is passivated in air, such as Cr or ...

Study of Metal Surfaces by Scanning Tunneling Microscopy with Field Ion

  • Kuk Y.

The reconstruction of metal surfaces, Au(100-(1x5), Au(110)- (2x1), Ni(110)-(5x2), and Ni(110)-Au(7x4) have been studied with scanning tunneling microscopy. The microscope is equipped with a field ion microscope which allows us to study the atomic structure of the tip and the sample. An experimental definition of STM resolution is proposed from ...

A 3.9ns 32-Bit 0.75micron CMOS Adder Utilizing Multiple Output Domino Logic

  • Fisher A.
  • Hwang I.

This paper introduces Multiple Output Domino Logic (MODL) which can reduce a circuit's transistor count by a factor of more than 2 compared to conventional Domino logic.

Introduction to Neuro Computing and Neuromachines

  • Jackel L.

This talk will outline some of the basic computations that can be performed by electronic neural networks. Several different VLSI chip architectures will be described along with some potential applications.

Quantum Wells for Optical Processing Applications

  • Livescu G.
  • Miller D.

Quantum wells (QWs), which can be made from alternate thin layers of two semiconductor materials, show a large electroabsorption called the quantum-confined Stark effect (QCSE). This made possible the realization of electrically controlled optical modulators, and optically controlled self electro-optic effect devices (SEED), that can operate at high speed and ...

Parallelism in the Rapport Multimedia Conferencing System

  • Ahuja S.
  • Ensor J.
  • Horn D.

Rapport is a multimedia conferencing system which executes on a collection of network-connected workstations. This system provides communication protocols and user interfaces that effect a natural conferencing environment in which users conduct remote, interactive conferences by talking with each other and producing and editing common displays on their workstations.

Calculating Time-Dependent Performance Measures for the M/M/1 Queue

  • Abate J.
  • Whitt W.

This correspondence discusses methods for computing transient performance measures for the M/M/1 queue. These performance measures are often expressed in terms of modified Bessel functions without any discussion about computation. In fact, a common expression for the probability transition function of the M/M/1 queue length process has an infinite sum ...

Simple Spectral Representations for the M/M/1 Queue

  • Abate J.
  • Whitt W.

This paper shows that certain basic descriptions of the time-dependent behavior of the M/M/1 queue have very simple representations as mixtures of exponentials. In particular, this is true for the busy-period density, the probability that the server is busy starting at zero, the expected queue length starting at zero and ...

System Design and Development for Control, Acquisition, and Analysis of Signals from Fiber Optic Sensors

  • Ehlert K.

Fiber optic remote sensing has many advantages in industrial and biomedical applications. Optical fluorescence based sensors offer simplicity of concept, immunity from external interference, and a potential for miniaturization. The use of optical fluorescence based sensors fulfills a recognized need in biomedical research for monitoring physiological variables such as pH ...

Application Specific ICs for DSP

  • Moscovitz H.

A tutorial review of various design methodologies for the design of application specific DSP VLSI is presented. An design methodology is described for the automatic generation of high-performance application specific DSP integrated circuits.

The AT&T Maskview(TM) Software

  • Cutler R.

The AT&T Maskview(TM) software produces graphic displays of masks from the data that is accepted by Perkin-Elmer MEBES machines.

A Single-Chip Peer-Relationship Optical Transceiver

  • Havens J.

A CMOS peer-relationship optical transceiver has been fabricated, permitting bi-directional digital data transmission with one optical fiber. The IC, when used with a single LED, provides two full- duplex user data channels at 19.2 kbit/s and 1200 bit/s via a time-division multiplexing of the optical signals.

A Single-Chip Peer-Relationship Optical Transceiver

  • Havens J.

A CMOS peer-relationship optical transceiver has been fabricated, permitting bi-directional digital data transmission with one optical fiber. The IC, when used with a single LED, provides two full-duplex user data channels at 19.2 kbit/s and 1200 bit/s via a time-division multiplexing of the optical signals.

Chemical Aspects of Copper Oxide Superconductors

  • Murphy D.

Work from AT&T Bell Laboratories on copper oxide containing super conductors will described. This will include data on K sub2 NiF sub 4 type structures and defect perovskite type structures. Various aspects especially related to the crystal chemistry of these materials will be emphasized.

Chemical Aspects of Copper Oxide Superconductors

  • Murphy D.

Work from AT&T Bell Laboratories on copper oxide containing super conductors will described. This will include data on K sub2 NiF sub 4 type structures and defect perovskite type structures. Various aspects especially related to the crystal chemistry of these materials will be emphasized.

How to Meet the Packaging/Assembly Challenges

  • Kane D.
  • Pfahnl A.

The new qualification/certification procedures for chip design, wafer fab, and packaging/assembly place the emphasis on in-line control as opposed to the present final product testing. The specific challenges in the packaging/assembly areas are the increasingly higher electrical, thermal, and mechanical performance requirements, the wide variety of package types and designs ...

Modification of the Post-Curing Behavior of Siloxane Networks

  • Pratt M.
  • Quan X.

Siloxane networks formed by the vinyl-addition curing mechanism often contain excess silane groups to improve the curing kinetics. These silanes are reactive, and a network that nominally is fully cured can undergo further reaction, or post-curing, to form additional cross-links, leading to an increase in modulus with time.

The Critical Role of Communications Protocols in Systems Engineering

  • Hale J.

Systems Engineering is a discipline that draws on talent from many different areas, including: Electrical Engineering, Statistics, Mathematics, Computer Science/Engineering, Operations Research, Business, Marketing and Economics. At AT&T Bell Laboratories, Systems Engineers work cooperatively with researchers and developers to ensure that AT&T products and services meet the needs of customers ...