Abstract: A wavelength-division multiplex optical transmission system is provided with: preliminary optical modulators 111 to 11n for outputting optical signals having different wavelengths from each other after being modulated by communications signals 11 to 1n that are signals to be supplied to specific optical receiving parts; an optical fiber 510 for transmitting the multiplexed optical signal; a subsequent optical modulator 210 for collectively modulating the transmitted optical signal so as to collectively modulate the optical signals being multiplexed by a broadcast signal 20 that is to be supplied equally to all optical receiving parts; and an optical fiber 520 for transmitting the modulated optical signal. A frequency band for the broadcast signal 20 is set not to overlap with any of those of the communications signals 11 to 1n.

Abstract: A method of automatically generating a multi-variable fuzzy inference system using a Fourier series expansion. Sample sets are decomposed into a cluster of sample sets associated with given input variables. Fuzzy rules and membership functions are computed individually for each variable by solving a single input multiple outputs fuzzy system extracted from the set cluster. The resulting fuzzy rules and membership functions are composed and integrated back into the fuzzy system appropriate for the original sample set with a minimal computational cost. In addition, an overall system error can be related to errors at each stage of decomposition and composition, enabling error bounds or accuracy thresholds for each stage to be specified and ensuring the final precision of the resulting fuzzy system on the original sample set.

Abstract: A light emitting section 12 outputs an optical signal having an intensity corresponding to a transmission timing signal 81, the optical signal modulated based on a radio transmission signal 82. A received photocurrent detection section 22 detects an intensity of an optical signal received by a light receiving section 21. In accordance with the detected intensity, a high frequency amplification section 23 amplifies the output signal of the light receiving section 21, and a transmission timing signal reconstruction section 24 reconstructs the transmission timing signal. The use of the light emitting section 12 outputting no optical signal in a non-transmission state and the use of the high frequency amplification section 23 outputting no signal in the non-transmission state allow noise caused in an antenna side base station 20 in the non-transmission state to be reduced.

Abstract: A computer-based information search and retrieval system and method for retrieving textual digital objects that makes full use of the projections of the documents onto both the reduced document space characterized by the singular value decomposition-based latent semantic structure and its orthogonal space. The resulting system and method has increased robustness, improving the instability of the traditional keyword search engine due to synonymy and/or polysemy of a natural language, and therefore is particularly suitable for web document searching over a distributed computer network such as the Internet.

Abstract: A method of automatically generating a multi-variable fuzzy inference system using a Fourier series expansion. Sample sets are decomposed into a cluster of sample sets associated with given input variables. Fuzzy rules and membership functions are computed individually for each variable by solving a single input multiple outputs fuzzy system extracted from the set cluster. The resulting fuzzy rules and membership functions are composed and integrated back into the fuzzy system appropriate for the original sample set with a minimal computational cost. In addition, an overall system error can be related to errors at each stage of decomposition and composition, enabling error bounds or accuracy thresholds for each stage to be specified and ensuring the final precision of the resulting fuzzy system on the original sample set.

Abstract: To allow the precision of correction to be increased in such an application as correcting an input sentence by using a template pattern for model sentence.

Abstract: An optical transmission apparatus capable of suppressing SBS by multiplexing an input signal with a pilot signal, and further capable of eliminating an adverse effect of intermodulation distortion between the input signal and the pilot signal is provided. When the input signal is a frequency-multiplexed signal obtained by multiplexing a plurality of signals aligned on a frequency axis at regular intervals &Dgr;f (&Dgr;f>0), a pilot signal generation part generates the pilot signal having a frequency {m−(1/2)}×&Dgr;f (m is an arbitrary natural number). A multiplex part multiplexes the input signal (electrical signal to be transmitted) with the pilot signal generated by the pilot signal generation part. An electrical-optical conversion part converts an electric signal outputted from the multiplex part into an optical signal through direct intensity modulation.

Abstract: A new, more efficient memory translation algorithm facilitating the acquisition of a most appropriate translation in a target language from among those of nearly narrowed-down candidates of translation by separately applying the so-called dimension reducing functions of a template automaton and the LSI (latent semantic index) technique. Both the template automaton and the LSI principle play an important role in implementing an efficient process of narrowing down an efficient solution space from among the many example sentences of the databases in a target language by exploiting their respective unique search space reduction function. Once developed into a fully operational system, an expert editor rather than an expert translator can tune up the translation memory system, markedly widening the range of available experts who can utilize the system.

Abstract: An accurate grammar analyzer based on a so-called POST (part-of-speech tagged) parser and a learners' model for use in automated language learning applications such as the template-based ICALL (intelligent computer assisted language learning) system.

Abstract: An optical coaxial hybrid transmission system capable of quickly achieving high-speed Internet access at low cost without making any substantial changes to a transmission path of the existing system is provided. In this system, m-channel communications signals having frequencies of f1 to fm (Hz) corresponding to micro-cells 51 are converted into optical signals having different wavelengths by communications signal optical transmitters 102. These optical signals are wavelength-multiplexed by a communications signal wavelength multiplexer 103, and then wavelength-multiplexed by a video/communications signal wavelength multiplexer 104 with an optical signal modulated with a video signal. The resultant wavelength-multiplexed optical signal is transmitted to a node 30. In the node 30, the wavelength-multiplex optical signal is demultiplexed, and the video signal and the communications signals are frequency-multiplexed for transmission to the corresponding micro-cells 51.

Abstract: An accurate grammar analyzer based on a so-called POST (part-of-speech tagged) parser and a learners' model for use in automated language learning applications such as the template-based ICALL (intelligent computer assisted language learning) system.

Abstract: To improve the precision in correction of an input sentence by using a template pattern for model sentence. A plurality of template patterns for the model sentence are provided beforehand. Each of the template patterns is regarded as a plurality of templates of words/phrases based on expertise of language teachers with scores assigned to the words according to their importance. The scores and subsequently the input sentence are read and analyzed in comparison with each of the template patterns and the total of scores of matching words is calculated. A template pattern having the highest total score is selected as an optimum template pattern and the input sentence is corrected using the optimum template pattern. This method improves the likelihood that a template pattern containing a larger number of important words is selected as the optimum template pattern.

Abstract: An electrolytic in-process dressing device 10 is provided with a disk-shaped metal-bonded grindstone 2 with a surface 2a with a circular arc shape with a radius R at its outer periphery and a numerical control device 16. The disk-shaped metal-bonded grindstone 2 rotates around an axis Y, and the grindstone is dressed electrolytically while the device 10 grinds the workpiece 1. The numerical control device 16 is provided with a rotary truing device 12 that rotates around the X axis that orthogonally crosses the axis of rotation Y and trues the circular arc surface 2a, a shape measuring device 14 for measuring the shape of the circular arc surface of the grindstone and the shape of the processed surface of workpiece 1 on the machine, and controls the grindstone numerically in the three directions along the axes X, Y and Z. The numerical control device 16 moves the grindstone in three axial directions and repeats the operations of truing, grinding and measurements on-line.

Abstract: A computer-based information search and retrieval system and method for retrieving textual digital objects that makes full use of the projections of the documents onto both the reduced document space characterized by the singular value decomposition-based latent semantic structure and its orthogonal space. The resulting system and method has increased robustness, improving the instability of the traditional keyword search engine due to synonymy and/or polysemy of a natural language, and therefore is particularly suitable for web document searching over a distributed computer network such as the Internet.

Abstract: A method for automatic document classification based on a combined use of the projection and the distance of the differential document vectors to the differential latent semantics index (DLSI) spaces. The method includes the setting up of a DLSI space-based classifier and the use of such classifier to evaluate the possibility of a document belonging to a given cluster using a posteriori probability function.

Abstract: A modulated electrical signal Smod produced upon amplitude-modulating a subcarrier having a high frequency (for example, a millimeter-wave band) by a baseband signal SBB to be transmitted and a main carrier MC outputted from a light source 110 are inputted to an external optical modulating portion 120 in an optical transmitter 101. The external optical modulating portion 120 amplitude-modulates the main carrier MC by the modulated electrical signal Smod, to output a double-modulated optical signal OSdmod to an optical filter portion 130. The optical filter portion 130 passes only a component of one of sidebands included in the double-modulated optical signal OSdmod, and outputs the component to an optical fiber 140 as an optical signal OS. An optical/electrical converting portion 150 in an optical receiver 102 optical/electrical-converts the optical signal OS transmitted through the optical fiber 140, to directly obtain a baseband signal SBB.

Abstract: A modulated electrical signal Smod produced upon amplitude-modulating a subcarrier having a high frequency (for example, a millimeter-wave band) by a baseband signal SBB to be transmitted and a main carrier MC outputted from a light source are inputted to an external optical modulating portion in an optical transmitter. The external optical modulating portion amplitude-modulates the main carrier MC by the modulated electrical signal Smod, to output a double-modulated optical signal OSdmod to an optical filter portion. The optical filter portion passes only a component of one of sidebands included in the double-modulated optical signal OSdmod, and outputs the component to an optical fiber as an optical signal OS. An optical/electrical converting portion in an optical receiver optical/electrical-converts the optical signal OS transmitted through the optical fiber, to directly obtain a baseband signal SBB.

Abstract: Radio base stations subject each code-division multiplex signal to frequency conversion so as to vary each frequency thereof according to the radio base stations and then converts the signal to an optical signal before transmitting the same to a switching station. The switching station multiplexes the optical signals, subjects a signal obtained after multiplexing to optical-electrical conversion, and extracts the code-division multiplex signal from the respective electrical signal obtained after the conversion. Consequently, each signal to be demodulated by demodulating sections includes nothing but the code-division multiplex signal outputted from the radio base stations. Therefore, a code-division multiplex signal outputted from a desired base station is not disturbed by code-division multiplex signals outputted from the other stations as a noise as will be in a conventional system.

Abstract: A plurality of modulators 110 respectively modulate inputted baseband signals into IF signals having different frequencies. A multiplexer 120 multiplexes the plurality of IF signals obtained by the modulation. An electrical-optical converter 130 converts the multiplexed IF signals into optical signals through intensity modulation. A local oscillation signal source 140 outputs a predetermined local oscillation signal. An external modulator 150 intensity-modulates the optical signal using the local oscillation signal. An optical branching portion 160 branches the intensity-modulated optical signal and respectively outputs optical signals obtained by the branching to radio base stations. An optical-electrical converter 21k converts the inputted optical signal into an electric signal, to obtain an RF signal obtained by frequency-converting the IF signal. Only a component having a desired radio frequency extracted in a band filter 22k from the RF signal is transmitted to a subscriber terminal from an antenna 23k.

Abstract: In optical transmission of a radio-frequency signal such as a microwave signal and millimeter-wave signal, a radio-frequency circuit for distortion compensation results in complex adjustment and very expensive. For betterment, the radio-frequency transmitter with the function of distortion compensation of the present invention takes the following structure.