Patents Represented by Attorney Jeffery J. Brosemer
  • Patent number: 5822096
    Abstract: A computer system that includes a plurality of processing elements for parallel computation utilizes a free-space optical network for communication between the processing elements. Such a network employs an optoelectronic switch that includes a binary H-type tree for routing signals to selected ones of an array of lasers. Hybrid repeaters are included in the optical paths to generate output optical beams colinear that are with incident input beams.
    Type: Grant
    Filed: November 16, 1995
    Date of Patent: October 13, 1998
    Assignee: NEC Research Institute, Inc.
    Inventors: Ian R. Redmond, Eugen Schenfeld
  • Patent number: 5812294
    Abstract: A linearized optical transmitter in which predistortion is employed to cancel both third and fifth order intermodulation distortion includes a modulated optical source responsive to a time varying electrical input signal to supply a time varying optical output signal containing multiple subcarrier signals. The modulated optical source is characterized by a non-linear transfer function such that intermodulation of the multiple subcarrier signals occurs, and for this reason, the optical transmitter further includes a predistortion circuit for supplying a predistorted signal comprising both the multiple subcarrier signals and intermodulation products substantially equal in magnitude and opposite in phase to those associated with the non-linear transfer function such that odd-order subcarrier intermodulation distortion products in the optical output signal are substantially canceled through the fifth order.
    Type: Grant
    Filed: August 7, 1996
    Date of Patent: September 22, 1998
    Assignee: Lucent Technologies Inc.
    Inventor: Gordon Cook Wilson
  • Patent number: 5793906
    Abstract: In a supercomputer that employs a large number of processors operating in parallel, groups of processors are assembled in clusters. Each processor in a cluster is provided with an array of lasers, a different one targeted for a particular detector associated with a specific processor of a different cluster. The detectors associated with the processors in the different cluster are assembled into an array of detectors. A processor wishing to communicate with a processor in a different cluster excites the laser in its associated array that is targeted to the detector of the processor with which it intends to communicate. The patterns of light of the various laser arrays are superimposed into one pattern focused on the detector array by means of an optical tunnel and a spherical lens.
    Type: Grant
    Filed: December 20, 1996
    Date of Patent: August 11, 1998
    Assignee: NEC Research Institute, Inc.
    Inventor: Alan Huang
  • Patent number: 5781671
    Abstract: A point-to-point optical network for interconnecting processing elements uses a two-dimensional array of chips, each of which includes a two-dimensional array of lasers that are used to target a two-dimensional array of photodetectors. A two-dimensional array of lenslets together with a spherical lens are used to focus light from a laser in the j, k position in any one of the laser arrays in any one of the chips on the particular photodetector in the j,k position in the photodetector array.
    Type: Grant
    Filed: October 4, 1995
    Date of Patent: July 14, 1998
    Assignee: NEC Research Institute, Inc.
    Inventors: Yao Li, Richard A. Linke, Ting Wang
  • Patent number: 5761386
    Abstract: A method and apparatus for the prediction of time series data, specifically, the prediction of a foreign currency exchange rate. The method disclosed transforms the time series data into a difference of a series, compresses the transformed data using a log transformation, converts the compressed data into symbols, and subsequently trains one or more neural networks on the symbols such that a prediction is generated. Alternative embodiments demonstrate the conversion by a self-organizing map and training by a recurrent neural network.
    Type: Grant
    Filed: June 16, 1997
    Date of Patent: June 2, 1998
    Assignee: NEC Research Institute, Inc.
    Inventors: Stephen Robert Lawrence, C. Lee Giles
  • Patent number: 5748647
    Abstract: An alternative method for testing circuits (H-SCAN) which retains the main advantage of full scan testing, namely, the ability to use combinational automatic test pattern generation (ATPG), while eliminating the high area overhead the long test application time associated with full, scan test methods. The method provides a practical test methodology that can be easily applied to any RT-level specification. The method uses existing connections of registers and other structures available in a high-level specification of a circuit without necessitating the use of scan flip-flops. Test application time is reduced by using the parallelism inherent in the circuit design to load multiple flip-flops in a single clock cycle, without having to add parallel scan chains as done in traditional parallel scan approaches.
    Type: Grant
    Filed: October 31, 1996
    Date of Patent: May 5, 1998
    Assignee: NEC USA, Inc.
    Inventors: Subhrajit Bhattacharya, Sujit Dey
  • Patent number: 5736759
    Abstract: A fatigue resistent ferroelectric element having a ferroelectric body, and regions of enhanced oxide ion mobility on opposite sides of the body to which are attached electrodes. In one embodiment, an element made from the known ferroelectric material PZT is treated at each of two surfaces where the electrodes are to be attached with a fast ion conductor, such as doped yttria stabilized zirconia. In another embodiment, a ferroelectric element constructed essentially of strontium tantalite (SrTaO.sub.6) has each of its surfaces where electrodes are to be attached treated with bismuth oxide (Bi.sub.2 O.sub.3) that is then diffused into surface regions of the element during an annealing process.
    Type: Grant
    Filed: July 24, 1996
    Date of Patent: April 7, 1998
    Assignee: NEC Research Institute, Inc.
    Inventor: Robert C. Haushalter
  • Patent number: 5731983
    Abstract: A method of circuit synthesis which considers all circuit configurations that can be designed utilizing a retiming with logic duplication (RLD) methodology. These circuit configurations (RLD configurations) each have significantly different area, performance and testability characteristics and are represented as a set of feasible solutions to an integer linear program (ILP). The ILP permits the evaluation of different design and testability metrics for each of the configurations. An approach to solve several useful special cases of the ILP in polynomial time and an application of RLD transformation to partial scan is shown. Using this method, a desired RLD configuration is produced having a minimal number of duplicated logic nodes.
    Type: Grant
    Filed: December 29, 1995
    Date of Patent: March 24, 1998
    Assignee: NEC USA, Inc.
    Inventors: Arunkumar Balakrishnan, Srimat T. Chakradhar
  • Patent number: 5726996
    Abstract: A new dynamic process for test sequence compaction and test cycle reduction that identifies bottlenecks that prevent vector compaction and test cycle reduction for test sequences generated initially and generates subsequent test sequences with the aim of eliminating bottlenecks of the initially generated test sequences. To apply the process to sequential circuits, a sliding anchor frame technique is used that involves specifying the unspecified bits of a partially specified test sequence to detect other faults.
    Type: Grant
    Filed: September 18, 1995
    Date of Patent: March 10, 1998
    Assignee: NEC USA, Inc.
    Inventors: Srimat T. Chakradhar, Anand Raghunathan
  • Patent number: 5724586
    Abstract: A method for improving the cache locality of an application executing in a computer system by decomposing the application into one or more threads and subsequently scheduling the execution of the threads such that a next thread to be executed is likely to reside in cache. The method operates by identifying a tour of points through a k-dimensional space such that cache misses are minimized. The space is divided into a plurality of equally sized blocks and may be extended for application to multiple cache levels.
    Type: Grant
    Filed: September 30, 1996
    Date of Patent: March 3, 1998
    Assignee: NEC Research Institute, Inc.
    Inventors: Jan Sterling Edler, Kai Li, James F. Philbin
  • Patent number: 5717691
    Abstract: A multimedia communications and computer platform that can serve as a network interface card combined with an internal distribution network for a full range of user terminal devices. It includes an interconnection network module that serves to route all incoming and outgoing information by way of high speed buses with value added features for communication protocol acceleration. In particular, attached to the different ports of the network are an ATM module, a communications processor, a media processor and a variety of terminal devices. By migrating processing intensive functions of network protocol termination, media stream distribution and media stream adaptation into the network interface card, there are avoided the bottlenecks of the traditional CPU centric approach to ATM systems.
    Type: Grant
    Filed: October 30, 1995
    Date of Patent: February 10, 1998
    Assignee: NEC USA, Inc.
    Inventors: Rajiv S. Dighe, Zoran Miljanic, Dipankar Raychaudhuri
  • Patent number: 5717120
    Abstract: A number of layered vanadium oxide crystalline compositions are prepared by simple hydrothermal reactions. Generally, the compositions comprise parallel layers of mixed valence vanadium oxides with guest cations intercalated between the layers. The guest cations may comprise metal coordination complexes with bidentate ligands, monomeric ammonium or diammonium cations, or mixtures of alkali metal cations with monomeric ammonium cation or diammonium cations.
    Type: Grant
    Filed: October 11, 1996
    Date of Patent: February 10, 1998
    Assignees: NEC Research Institute, Inc., Syracuse University, Texas A&M University System
    Inventors: Jeffrey Robert Douglas DeBord, Robert C. Haushalter, Yiping Zhang
  • Patent number: 5699215
    Abstract: A non-magnetic magnetoresistive head for reading a magnetic pattern stored as domains in tracks on a storage device uses as the sensor a wafer of a high electron mobility non-magnetic semiconductor, such as indium antimonide or mercury-cadmium telluride, which includes an electrode configuration that includes an inner stripe electrode and an outer rectangular electrode surrounding the inner electrode. The wafer is supported so that the plane of the wafer is parallel to the disk and perpendicular to the magnetic field being sensed.
    Type: Grant
    Filed: March 11, 1997
    Date of Patent: December 16, 1997
    Assignee: NEC Research Institute, Inc.
    Inventors: Stuart A. Solin, Ned Scott Wingreen
  • Patent number: 5696964
    Abstract: A queryless, multimedia database search method incorporating a Bayesian inference engine that refines its answer with each user response. The set of user responses includes of a series of displays and user actions, and is defined by a relatively simple user interface.
    Type: Grant
    Filed: April 16, 1996
    Date of Patent: December 9, 1997
    Assignee: NEC Research Institute, Inc.
    Inventors: Ingemar J. Cox, Matthew L. Miller, Stephen M. Omohundro, Peter N. Yianilos
  • Patent number: 5696655
    Abstract: A self-biasing, non-magnetic giant magnetoresistive sensor constructed from a thin film of inhomogeneous magnetoresistive material showing Giant Magnetresistance (GMR) at T=300.degree. K., e.g., Mercury Cadmium Telluride. In one embodiment, the sensor has a silicon substrate, a layer of inhomogeneous magnetoresistive material, e.g., Hg.sub.l-x Cd.sub.x Te, and electrodes attached to the non-homogeneous magnetoresistive layer. Alternatively, a buffer layer of, e.g., CdTe may overlay the substrate. In another embodiment, the sensor is an active element of a read/write head, particularly well suited for reading information signals stored in a magnetic medium.
    Type: Grant
    Filed: July 30, 1996
    Date of Patent: December 9, 1997
    Assignee: NEC Research Institute, Inc.
    Inventors: Masaya Kawano, Stuart A. Solin, Tineke Thio
  • Patent number: 5692003
    Abstract: A quantum-dot cascade laser which eliminates single phonon decays associated with quantum-well devices. The elimination of single phonon decays is realized by a three-dimensional confinement resulting in a several-order-of-magnitude reduction in the threshold current. Dot size, dot density and dot uniformity requirements are presented along with several embodiments.
    Type: Grant
    Filed: March 29, 1996
    Date of Patent: November 25, 1997
    Assignee: NEC Research Institute, Inc.
    Inventors: Ned Scott Wingreen, Charles A. Stafford
  • Patent number: 5673344
    Abstract: A method and apparatus for tapping and distributing light propagating through a polymer optical fiber (POF). Within the polymer optical fiber, one or more mirrors are constructed. At a point in the POF where an internal mirror is constructed, light traversing the POF is efficiently diverted out of the polymer optical fiber upon striking the mirror. As such, the light which is diverted is effectively tapped off and may be put to an advantageous use.
    Type: Grant
    Filed: June 20, 1996
    Date of Patent: September 30, 1997
    Assignee: NEC Research Institute, Inc.
    Inventors: Yao Li, Ting Wang
  • Patent number: 5672465
    Abstract: Described is a radiation sensitive imaging film containing a heat fixable radiation sensitive element, e.g., a diacetylene, of the formula: R--C.tbd.C--C.tbd.C--R', where R and R' are, e.g., both --CH.sub.2 --O--CONH--(CH.sub.2).sub.5 CH.sub.3. After exposure to X-radiation during diagnostic or X-ray therapy, the resulting image can be permanently dry fixed by a short heating step and then stored for a long period. Processes for making the film, new binder-convertor systems, and a device incorporating the film are described as well as other imaging, diagnostic and therapeutic methods utilizing the film in high energy radiation applications in the health care field.
    Type: Grant
    Filed: January 9, 1995
    Date of Patent: September 30, 1997
    Assignee: JP Laboratories, Inc.
    Inventors: Gordhanbhai N. Patel, Yao-Ming Cheng, Subhash H. Patel
  • Patent number: 5663888
    Abstract: A process for redesign of a sequential circuit to provide a functionally equivalent circuit that can operate with a shorter clock cycle. It includes forming a path graph of the circuit, classifying short and long arcs of the graph and developing sets of short and long path inequalities from which there is developed an objective function which is solved to provide an optimal set of delay constraints. These are used to synthesize a new circuit which after retiming results in the desired redesigned circuit.
    Type: Grant
    Filed: April 29, 1996
    Date of Patent: September 2, 1997
    Assignee: NEC USA, Inc.
    Inventor: Srimat T. Chakradhar
  • Patent number: 5661584
    Abstract: A computer system that includes a plurality of processing elements for parallel computation utilizes a free-space optical network for communication between the processing elements. Such a network employs an optoelectronic switch that includes a binary H-type tree for routing signals to selected ones of an array of lasers. Hybrid repeaters are included in the optical paths to generate output optical beams colinear that are with incident input beams.
    Type: Grant
    Filed: November 16, 1995
    Date of Patent: August 26, 1997
    Assignee: NEC Research Institute, Inc.
    Inventors: Ian R. Redmond, Eugen Schenfeld