Abstract: A method of identifying, retrieving, or sorting documents by language or topic involving the steps of creating an n-gram array for each document in a database, parsing an unidentified document or query into n-grams, assigning a weight to each n-gram, removing the commonality from the n-grams, comparing each unidentified document or query to each database document, scoring the unidentified document or query against each database document for similarity, and based on the similarity score, identifying retrieving, or sorting the document or query with-respect to language or topic.

Abstract: An apparatus and method is provided for measuring photoresist parameters in situ is disclosed. Transmission and reflectivity detectors are used in a lithographic exposure tool to obtain in situ absorption parameters and reflectivity data. The absorption parameters and reflectivity data are used in a feedback control system that controls the exposure dose used in the lithographic tool.

Abstract: An authenticator circuit and message authentication apparatus. The circuit includes a plurality of shift register stages, some of which are separated by adders having an input from a succeeding stage. Switching circuits selectively control the second adder inputs to determine the shifting sequence of information passing through the register stages. A message authentication apparatus includes a key generator and authenticator circuit converted at the output of a transmitter. The input of a receiver includes a similar authenticator circuit and key generator, plus a counter.

Abstract: The present invention relates to a device for and a method of performing an n-bit modular multiplication of A.times.B modulo C in approximately n/2 steps, where A denotes a binary multiplier, B denotes a binary multiplicand, and C denotes a binary modulus. A, B, and -C are stored in registers. All variables needed to perform the A.times.B modulo C are generated. A partial product register is initialized. The multiplier A is scanned two bits at a time. The value of these two bits determines the multiple of B added to the partial product register. The values 4C, 2C, and C are subtracted from the partial product. If any of these subtractions result in a negative number the result of that subtraction is discarded. The partial product is then shifted two significant positions and stored in the partial product register. These steps are repeated until every bit of A has been scanned. The partial product is then converted to non-redundant form. The value C is then subtracted from the partial product.

Abstract: A high security tamper evident package for the shipping and storing of a variety of highly proprietary electronic components. The package has a lid and a multi-compartmented base which are threaded together to actively engage an automatic locking system enabled by breakaway tabs on the wall of the base sliding over and engaging behind ramps protruding from the inner surface of the lid. Upon unscrewing the base from the lid, the tabs break off as pressure is applied by movement against the back of the ramps, leaving permanent evidence of the package having been opened. A textured grip on the bottom of the package provides ease of handling and fits snugly onto a raised ring on the top of another package to allow for easy stacking and efficient storage.

Abstract: The present invention discloses a method of measuring magnetic fields on magnetically recorded media. The method entails replacing the metal tip typically used with a scanning tunneling microscope with a flexible thin-film nickel of iron magnetic probe. The present invention describes a mathematical equation that relates probe position to magnetic field strength. In order to establish a tunneling current between the magnetic probe and the magnetically recorded media, any protective layer on the magnetically recorded media is removed. The magnetic probe and the magnetically recorded media may be coated with at least three-hundred angstroms of gold in order to reduce spurious probe deflections due to oxide growths on either the magnetic probe or the magnetically recorded media. The scanning tunneling microscope is designed to maintain a constant tunneling current between the probe and the item being scanned.

Abstract: An apparatus is described which detects the presence or absence of coherent light and provides an estimate of the coherent light's wavelength. The apparatus employs a common-path "polarization interferometer" in which the two linear polarization paths act as interferometer legs. Electro-optic modulation is used to effect periodic differential path length changes in the interferometer. The apparatus performs synchronous time-integrating detection on the light emerging from the interferometer to measure coherent contributions in the presence of obscuring incoherent light.

Abstract: A method is disclosed for encoding signals for transmission to provide signals which simultaneously have specifiable autocorrelation properties and low predictability. To enhance the accuracy of time of arrival measurements in the presence of either noise or multipath due to skywaves in systems such as LORAN, the coding method provides for low autocorrelation function values at time offsets approximately equal to the expected delay between direct waves and skywaves. This is accomplished by constructing the codeword which is used to encode the signal, from an Nth difference constant ratio codeword, where the expected time delay is equal to N-bits. The constant ratio codewords and the transmitted codewords are both pseudo-randomly generated, resulting in a transmitted signal having very low predictability to an unintended recipient, thereby considerably reducing the effectiveness of attempts at jamming or other electronic countermeasures attacks.

Abstract: A tamper-evident container is disclosed that can be reused a limited number of times with the tamper-evident feature for secure storage or transport of material. The container is made up of a base and a lid. The base has a hollow interior for holding material and an open top. The base also has a number of platform-like holders, each with a hole, that project perpendicular to and inwardly from the interior walls of the base. The holders are used in attaching the lid to the base. The lid is the same shape as the base (i.e., multisided, hexagonal, or circular). The lid contains frangible elements which outnumber the holders in the base. Each frangible element is made up of a shaft tipped with a cone. Frangibility of the element is achieved by dividing it into quadrants and scoring the base. Each element extends downward from the interior-top of the lid. A subset of the frangible elements align with the holders in the base. The container is closed when a subset of frangible elements engage with the holders.

Abstract: A three-mode seat for a motor vehicle cooperable with an adult seat belt assembly to provide three modes of operation including an adult seat mode, a large child booster seat mode, and a small child mode. The seat includes a child's seat module arranged to be secured to the seat back frame between the space provided between two side cushions. The module includes a rigid back panel which carries a cushion assembly and a child's seat belt assembly.

Abstract: Apparatus for performing a bit serial orthogonal transformation instruction (BSOTI) is characterized by a unique circuit of bit inputs from two vector registers, a plurality of switching devices, and OR gates for performing transformation. The apparatus enables vector machines to operate on individual bits of words as quickly as it operates on the words stored in memory. Vector computers are thus able to perform efficient bit-serial arithmetic as well as the more traditional fast vector/scalar operations.

Abstract: A method and apparatus for secure, fast storage and retrieval of information relative to a storage device without interactive checking is characterized by the use of a unique variable range adder. The variable range adder automatically modifies addresses to the storage device and causes data storage and retrieval to conform to the Bell and LaPadula security model, independently of software.

Abstract: A fuser roll including a hollow cylinder having a relatively thin wall, the cylinder being a plastic composition reinforced with a conductive fiber filler, the plastic composition having a resistivity between 0.5 and 0.05 ohm.cm, the cylinder having an outside and an inside surface and enclosing ambient air, a back up roll disposed in an engaging relationship with the outside surface of the hollow cylinder defining said nip, a heating element disposed within said relatively thin wall, the heating element being said conductive fiber filler, the conductive fiber filler also providing the mechanical reinforcement of the hollow cylinder, and an additive, the additive being part of the plastic composition, the additive providing a release layer on the outside surface of the cylinder, the additive being a fluorocarbon at approximately 0.25 percent by weight.

Abstract: An outer product shearing interferometer for an optical source of one-dimensional extent which provides interference between every two points on the source. The interferometer comprises an input plane containing the source, an output plane for observing the outer product, a hologram which imparts the sum of two contributions whose phases are bilinear functions of the spatial coordinates, a two-dimensional Fourier transform system which illuminates the hologram with the transform of light from the input plane, and a one-dimensional Fourier transform system which takes light from the hologram and illuminates the output plane.

Abstract: An outer product shearing interferometer for an optical source of one-dimensional extent which provides simultaneous interference between every two points on the source. The interferometer comprises an input plane containing the source, an output plane for observing the outer product, an imaging system between the two planes, and a mask positioned in the transform plane of the imaging system and having slits arranged to effect the desired outer product. The desired outer product results from a simultaneous application of many lateral shears instead of only one at a time.

Abstract: An intrusion detection optical communication system modifies the original data signal to include a synchronizing periodic waveform. The receiver generates an inverted synchronizing periodic waveform signal corresponding with the transmitted signal to null the same under normal operation. When an intrusion in the optical system arises, power is extracted from the system and the nulled condition is disrupted. The disruption is detected and activates an alarm circuit when the disruption is above a threshold value.

Abstract: The reconfigurable pipelined processor includes a plurality of memory devices and arithmetic units interconnected by cross bars for transferring raw and processed data therebetween. A counter is connected with the cross bar to provide a source of addresses for the memory devices. At least one variable tick delay device is connected with each memory and arithmetic unit to variably control the input and output operations thereof to selectively delay the memory devices and arithmetic units to align the data for processing in a selected sequence.

Abstract: In the hybrid encoder for video signals described the picture elements of a video picture are arranged into equally large data blocks and each newly entered data block, is compared with a data block of the previous video picture by means of a subtractor (SR). The data blocks of the previous picture are stored in a picture store (BS). In order to maintain the transmission bit rates as small as possible, the data blocks are conventionally subjected to a transformation (for example, a Fourier transformation) (F) and a subsequent quantization (Q). For the required strong bit rate reduction a rough quantization is necessary, which leads to a strong quantization noise. To eliminate the quantization noise a blockwise adaptive low-pass filtering (T,FTI) is performed in two signal paths of the hybrid encoder. The quantizer (Q) may then have a refined design or it may be omitted altogether.

Abstract: A method for achieving tapered contact sidewalls by wet etching during fabrication of a semiconductor device is characterized by the addition of a second layer of undoped oxide to a bilayer sandwich deposited over the wafer of the device. The second layer of undoped oxide reduces the etch rate at the oxide/photoresist interface thereby providing gradual taper and improved metal step coverage. The reduced etch rate extends the utility of wet etching without changing etchant bath concentration or temperature.

Abstract: An apparatus is described which performs acoustooptical signal processing functions with incoherent light, which procedures were formerly possible only with coherent light devices. Specific embodiments include an optical excisor, i.e., a programmable filter; a multichannel radiometer, i.e., an apparatus which estimates the power spectrum of a signal accompanied by noise; and an ambiguity processor, i.e., a time versus frequency cross correlator.