Abstract: The mail gateway generates an identifier for each of attached files included in the e-mail addressed to a user and held in the mail server, and notifies the mail terminal belonging to the user of a list of generated IDs. When the user selects attached files that the user wants to attach to the e-mail from the list of IDs that is notified from the mail gateway, the mail gateway constructs e-mail including the selected attached files and the mail server transmits the constructed e-mail to receivers' addresses thereof.

Abstract: A data broadcasting station transmits a multiplexed signal in which multimedia data encoded in a prescribed coding system are at least multiplexed in a broadcasting form. A file manager stores the multimedia data received by a tuner and decoded by a decoder in a storage device while creating management information therefor and registering it in a table. A browser requests of the file manager multimedia data to be referred to, and lets it be displayed on a monitor. The file manager increments/decrements a retention coefficient on the basis of a frequency of reference to the multimedia, and determines whether or not to delete each multimedia data stored in the storage device. Thus provided is a terminal device which can effectively utilize the capacity of the storage device without deleting multimedia data frequently referred to by the user.

Abstract: A servo control apparatus controls operation of a to-be-controlled object through execution of software based on control data and reference data. An operation-signal generating portion generates an operation signal having a frequency representing the operation of the to-be-controlled object. A clock-signal generating portion generates a clock signal having a frequency controlled in accordance with the control data. A counting portion measures a time corresponding to the period of the operation-pulse signal by counting pulses of the clock signal, and generates a count value. A controlling portion controls the operation of the to-be-controlled object through execution of software based on the count value and the reference data.

Abstract: A polyphenylene ether resin composition which comprises: (A) from 30 to 95% by weight of a modified polyphenylene ether resin entirely or partially modified with an unsaturated carboxylic acid or a functional derivative thereof; (B) from 2 to 60% by weight of at least one of a polystyrene and a rubber-modified polystyrene; and (C) from 3 to 40% by weight of a styrene/acrylonitrile copolymer having an acrylonitrile ingredient content of from not less than 7% by weight to less than 11% by weight. The resin composition optionally contains (D) from 1 to 30 parts by weight of a phosphoric acid ester compound; and (E) from 1 to 100 parts by weight of an inorganic filler, each per 100 parts by weight of the total amount of said components (A), (B) and (C). Also disclosed is a molded article prepared from the resin composition.

Abstract: The present invention provides a flame-retardant resin composition which comprises 100 parts by weight of a thermoplastic resin (A) and 0.1 to 30 parts by weight of one or more of organic phosphorus compounds (B) represented by the following formula (1) ##STR1## wherein X is ##STR2## R.sub.1, R.sub.2, R.sub.3 and R.sub.4 independently represent a phenyl group or a xylyl group with at least one being a phenyl group and at least one being a xylyl group, and n is a positive integer.The flame-retardant resin composition of the present invention is excellent in heat resistance, impact strength in the form of thin-walled moldings and blooming-free property on the surface of articles molded therefrom.

Abstract: A polyphenylene ether resin composition which comprises: (A) from 30 to 95% by weight of a modified polyphenylene ether resin entirely or partially modified with an unsaturated carboxylic acid or a functional derivative thereof; (B) from 2 to 60% by weight of at least one of a polystyrene and a rubber-modified polystyrene; and (C) from 3 to 40% by weight of a styrene/acrylonitrile copolymer having an acrylonitrile ingredient content of from not less than 7% by weight to less than 11% by weight. The resin composition optionally contains (D) from 1 to 30 parts by weight of a phosphoric acid ester compound; and (E) from 1 to 100 parts by weight of an inorganic filler, each per 100 parts by weight of the total amount of said components (A), (B) and (C). Also disclosed is a molded article prepared from the resin composition.

Abstract: A motor speed control apparatus is provided in which the controllable frequency band of the control system can be sufficiently enhanced with a comparatively simple structure even if the frequency generator equipped into the motor is low in output frequency and the rotational accuracy can be highly improved even if the disturbance of high frequency components of load torque is applied to the motor. The frequency band of the control system can be improved by using the estimated speed signal as the speed feedback signal. A motor speed control apparatus superior in disturbance control characteristic can be realized through the feed forward compensation of an estimated load torque.

Abstract: A brushless DC motor detects a positional relationship between the rotor and the stator windings in a short period of time when starting the motor and immediately switches the mode from a phase coincidence mode at the time of starting to a normal position detecting mode performed by counting output pulses in response to the rotational speed of the rotor. The motor detects a position of the rotor at an extremely high accuracy independently of the magnitude of the load even when the motor has already been subjected to the application of such a load at the time of starting. The motor is always driven at a high efficiency by applying a phase correction process so as to cause the phase of each of the voltages respectively induced in the stator windings to coincide with the corresponding one of the driving currents respectively outputted to the stator windings when the motor is being rotated normally.

Abstract: Disclosed is a speed controller of a motor which comprises a rotation sensor for generating an A.C. signal having a period in accordance with a rotating speed of a motor; speed detection device for effecting detection operations a plurality of times per round of the motor by the A.C.

Abstract: A brushless DC motor driving apparatus for a brushless DC motor which includes a rotor possessing a plurality of magnetic poles, a stator, and a stator winding with plural phases provided on the stator at a specific gap with respect to the rotor, the apparatus including: a sensor for generating sensor signals of plural phases showing a state of rotation of the rotor depending on the rotation of the rotor; a direction detector for detecting a rotating direction of the rotor from the sensor signals of plural phases and for outputting a direction signal; an initial phase detector for outputting a first phase signal depending on the direction signal and for producing an initial count value corresponding to a position of the rotor; a counter for setting an initial value corresponding to the initial count value, and for increasing or decreasing the count value depending on the direction signal and at least one of the sensor signals and for outputting a second phase signal; a waveform generator for generating a posi

Abstract: Rubber particles comprising a hydrogenated block copolymer of a conjugated diene and a vinyl aromatic compound, said particles having a glass transition temperature of -30.degree. C. or less, a gel content of at least 10%, an average particle size of 0.01 to 5.0 .mu.m, and a micro-phase separating structure having hard segments and soft segments, wherein hard segments and soft segments are alternately laminated together in the form of concentric multilayers, are useful in reinforcing resin compositions. A particular reinforced resin composition is comprised of a matrix resin having a glass transition temperature of at least 0.degree. C. and 1 to 60% by weight of the above defined rubber particles dispersed in the matrix resin. The rubber particles have a great reinforcing effect on the matrix resin and resin compositions reinforced with these rubber particles are characterized with superior weather resistance, heat stability and impact resistance properties.

Abstract: A control system has a detecting block for obtaining a detected signal corresponding to a controlled variable of a controlled system, and a controlling block for supplying the controlled system with a control signal according to the detected signal. The controlling block includes an error signal producing block for producing an error signal from the detected signal at intervals of a detecting period of time, a memorizing block for storing a plurality of memorized values corresponding to the error signal, and a control signal producing block for producing the control signal by mixing the error signal with one or more of the memorized values. The memorizing block renews the memorized values sequentially and periodically at intervals of a renewing cycle period of time proportional to the detecting period, each with a mixed value computed from the error signal and one or more of the memorized values having been renewed at intervals of L renewing cycle periods, where L is an integer at least equal to 2.