Patents by Inventor Hiroshi Furukawa

Hiroshi Furukawa has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Radio-wave propagation characteristic forecasting system and its method, and program
    Publication number: 20050088165
    Abstract: An object of the invention is to obtain a high-speed and high-accuracy radio-wave propagation characteristic forecasting system in combination with the launching method by correctly estimating a diffraction phenomenon when a ray passes the vicinity of an edge of a structure. To estimate a radio-wave propagation characteristic in accordance with the ray launching method, when a ray passes the vicinity of an edge of a structure, a diffracted wave is generated at the edge if the distance between the edge and the ray is smaller than the radius of a ray spread. Thereby, it is easy to combine the ray launching method with the conventional ray launching method and it is possible to estimate a high-speed high-accuracy radio-wave propagation characteristic also considering a ray diffracted wave.
    Type: Application
    Filed: March 23, 2004
    Publication date: April 28, 2005
    Applicant: NEC CORPORATION
    Inventors: Yoshinori Watanabe, Hiroshi Furukawa
  • Method and system for radio wave propagation characteristics estimation and ray spatial resolution control
    Patent number: 6876851
    Abstract: To shorten a required estimation time while keeping an estimation precision in an object environment given for estimating propagation characteristics with a ray launching method. In the case where a ray is propagated within a given observation area, and collides with a barrier residing on its path, a space in the vicinity of the ray is divided into a plurality of partial spaces until a predetermined condition is satisfied. The space in the vicinity of the ray that is considered to cause a degradation in the estimation precision is divided in reflection until there is less influence of degradation, whereby each of the subdivided partial spaces can be handled individually, so that the estimation precision of radio wave propagation characteristics can be made better than a conventional method.
    Type: Grant
    Filed: January 10, 2002
    Date of Patent: April 5, 2005
    Assignee: NEC Corporation
    Inventors: Yoshinori Watanabe, Hiroshi Furukawa
  • Low molecular weight polyphenylene ether
    Publication number: 20050070685
    Abstract: A low molecular weight polyphenylene ether having a reduced viscosity of 0.04 to 0.18 dl/g as measured at 30° C. in a 0.5 g/dl chloroform solution, and a molecular weight distribution of 1.5 to 2.5; or a low molecular weight polyphenylene ether powder comprising the low molecular weight polyphenylene ether exhibits high thermal resistance and excellent electric properties, and thus is useful as electric materials such as printed circuit board and as modifiers of other resins.
    Type: Application
    Filed: February 28, 2003
    Publication date: March 31, 2005
    Inventors: Akira Mitsui, Hiroshi Furukawa, Nobuyuki Ota
  • Method and base station for allocating pseudo noise code
    Patent number: 6856608
    Abstract: To prevent degradation of transmission quality due to interference between scramble codes, under such a situation as soft hand over, when the number of mobile stations connected with a base station exceeds the number of the orthogonal codes. The base station decides the priority of the scramble code. The scramble code is allocated to the mobile station, in accordance with the priority. When a mobile station ends its call, or stops temporarily its call, its PN code is re-allocated to the mobile station with lowest priority code.
    Type: Grant
    Filed: March 3, 2000
    Date of Patent: February 15, 2005
    Assignee: NEC Corporation
    Inventors: Hiroshi Furukawa, Kojiro Hamabe, Akihisa Ushirokawa
  • Transmission power control method and system
    Patent number: 6847818
    Abstract: A transmission power control technique allowing stable and reliable signal transmission in soft handover is disclosed. Each of the base stations involved in soft handover measures an amount of loss of the base station selection signal. When the amount of loss of the base station selection signal exceeds a threshold, the transmission power of the downlink signal is not set to the minimum level but to the normally controlled level. Further, a transmission power update timing of each base station is determined so that the downlink signal received at the mobile station changes in transmission power at a predetermined timing synchronized with that of other base stations.
    Type: Grant
    Filed: October 31, 2000
    Date of Patent: January 25, 2005
    Assignee: NEC Corporation
    Inventor: Hiroshi Furukawa
  • Storage sub-system and management program
    Publication number: 20040215673
    Abstract: An object of the present invention is to permit, with account movement, increase of the speed of data transfer of an exclusive storage area of a targeted account (a home directory of a user) and reduction of the load of a controller of a host computer.
    Type: Application
    Filed: August 28, 2003
    Publication date: October 28, 2004
    Inventors: Hiroshi Furukawa, Etsutaro Akagawa, Manabu Kitamura
  • Medium for recording network management program, management computer and managing method
    Publication number: 20040210791
    Abstract: In case a fault has occurred in a volume, it was so far difficult to correctly notify a fault by using a host computer which can access the volumes managed by a management computer that integrally manages a plurality of devices constituting a network. The management program of the invention is executed by the management computer connected to computers and to a plurality of storage devices for managing the volumes connected to the computers through a SAN (storage area network). The management program executes a procedure for receiving a notice of fault in the volume from the storage devices, a procedure for receiving volume access control information from a plurality of storage devices for specifying the computers that can access the volumes, and a procedure for notifying the fault in the volume to the computers that are permitted to access the volumes based on the volume access control information.
    Type: Application
    Filed: July 30, 2003
    Publication date: October 21, 2004
    Inventors: Etsutaro Akagawa, Hiroshi Furukawa
  • System, method and program product for estimating radio wave propagation characteristics
    Publication number: 20040192314
    Abstract: A radio wave propagation characteristics estimating system can estimate the propagation characteristics of a radio wave by ray tracing method that are suited for communication systems that occupy a large frequency band. The reflection coefficients, the diffraction coefficients and the transmission coefficients and the space attenuation ratio of the propagation course of each ray that arrives at reception point R1 are determined for each of a plurality of frequencies f1 to fM within the band occupied by the radio communication system that is the target of estimation to determine the intensity and the arrival delay time of the ray arriving at the reception point R1 for each of the frequencies f1 to fM. As a result, the frequency transfer functions for the frequencies f1 to fM are obtained.
    Type: Application
    Filed: March 30, 2004
    Publication date: September 30, 2004
    Applicant: NEC Corporation
    Inventors: Yoshinori Watanabe, Hiroto Sugahara, Hiroshi Furukawa
  • Channel decision method, and radio station and terminal device to be employed for it
    Publication number: 20040185861
    Abstract: In a radio communication system adapted to decide one channel out of a plurality of radio frequency channels, and to cause communication to be made between a radio base station and a child radio station, decision of the channel is made at a periodic timing in the radio base station to notify information relating to this decided channel to the child radio station. Also, a configuration is made so that whenever the channel is decided and switched, communication quality (interference state) of its channel is detected in an interference quantity determination section 140 to make the channel decision by making a reference to this communication quality as well. By doing so, less communication interruption time occurs, and an influence that is given to communication performance of a wireless LAN can be reduced.
    Type: Application
    Filed: January 27, 2004
    Publication date: September 23, 2004
    Inventors: Wataru Domon, Kazuhiro Okanoue, Hiroshi Furukawa
  • Multiwavelength light source device employing annular optical delay circuit
    Patent number: 6792215
    Abstract: A multi-wavelength light source apparatus includes a tunable light source, optical intensity modulator, optical coupler, annular optical delay circuit, and optical gate device. The tunable light source successively changes and outputs a plurality of output lights different in wavelength from one another. The optical intensity modulator outputs a modulated signal light obtained by modulating an amplitude of the output light outputted from the tunable light source over a predetermined time. The optical coupler is optically connected to the optical intensity modulator, and receives the light outputted from the optical intensity modulator. The annular optical delay circuit is optically connected to the optical coupler, and delays a part of the output light outputted from the optical intensity modulator over a time longer than the predetermined time.
    Type: Grant
    Filed: May 21, 2001
    Date of Patent: September 14, 2004
    Assignee: Anritsu Corporation
    Inventors: Isao Kobayashi, Koji Kawakita, Hiroshi Furukawa, Shigeru Kinugawa
  • Transmission power control method and system
    Publication number: 20040152483
    Abstract: A transmission power control technique allowing stable and reliable signal transmission in soft handover is disclosed. Each of the base stations involved in soft handover measures an amount of loss of the base station selection signal. When the amount of loss of the base station selection signal exceeds a threshold, the transmission power of the downlink signal is not set to the minimum level but to the normally controlled level. Further, a transmission power update timing of each base station is determined so that the downlink signal received at the mobile station changes in transmission power at a predetermined timing synchronized with that of other base stations.
    Type: Application
    Filed: January 23, 2004
    Publication date: August 5, 2004
    Inventor: Hiroshi Furukawa
  • Communication apparatus in radio network, transmission control method, threshold value control method, and radio network system
    Publication number: 20040132415
    Abstract: The carrier detector 5 notifies the threshold value controller 6 of the received power value of a received signal and then controls various portions so as to defer transmission of the transmission signal when receiving a signal having a received power exceeding a threshold value Rth from the threshold value controller 6. The demodulator 3 notifies the threshold value controller 6 of a transmission source included in the received signal. The modulator 4 notifies the threshold value controller 6 of the destination of the transmission signal. The threshold value controller 6 outputs the received power value of a received signal from the destination, as a threshold value Rth, to the carrier detector 5.
    Type: Application
    Filed: December 19, 2003
    Publication date: July 8, 2004
    Inventor: Hiroshi Furukawa
  • Base-station cell design method and base-station cell design apparatus, and program thereof in mobile communication system
    Publication number: 20040127224
    Abstract: The above base-station cell design method is for sequentially adding base stations, and a technique of which throughput is few is employed for a radio-wave propagation characteristic evaluation to be made in this addition, and a technique of which the throughput is much, but which is of high-precision, more specifically, a technique such as the ray tracing is applied for the radio-wave propagation characteristic evaluation to be made after addition. The result of the high-precision radio-wave propagation characteristic evaluation to be made after this addition is put to practical use for estimating an interference quantity in selecting the arrangement location of the base station to be added newly. This allows the quantity of the radio wave analytic processing, which accounts for a large majority of the base-station cell design processing, to be reduced, thus enabling a fast base-station cell design.
    Type: Application
    Filed: October 22, 2003
    Publication date: July 1, 2004
    Inventors: Hiroshi Furukawa, Koichi Ebata
  • Electron microscope, method for operating the same, and computer-readable medium
    Publication number: 20040108459
    Abstract: An electron microscope comprises a specimen designating section for designating a characteristic of a specimen, a simplified image observation condition setting section for setting one image observation conditions out of a plurality of simplified image observation conditions, which were set previously to contain setting of a degree of vacuum, based on the characteristic of the specimen, and a preview setting section for setting a preview function that forms a plurality of simplified observation images simply based on a plurality of different simplified image observation conditions and displays them on a display section. A preview function of forming simply a plurality of observation images based on a plurality of image observation conditions containing a degree of vacuum as a parameter and then displaying them in a second display area is executed.
    Type: Application
    Filed: November 7, 2003
    Publication date: June 10, 2004
    Inventors: Hiroshi Furukawa, Tomohiko Hirata
  • System and method for predicting radio wave propagation characteristics
    Patent number: 6735544
    Abstract: An object of the present invention provides a method of predicting radio wave propagation characteristics that can implement a ray launching technique at higher speed. A plurality of Central Processing Units (CPUs) are interconnected via a network, and a recording device that can be read or written from all the CPUs is installed, and plural rays radiated from a predetermined transmitting point are divided into a plurality of groups, each group being assigned to a different CPU, whereby the CPUs perform a ray launching processing for the assigned rays independently and simultaneously to predict the radio wave propagation characteristics. The plural rays radiated from the transmitting point are divided and assigned to the CPUs, and the ray launching processing is performed simultaneously, resulting in a shorter computation time.
    Type: Grant
    Filed: February 7, 2002
    Date of Patent: May 11, 2004
    Assignee: NEC Corporation
    Inventors: Hiroshi Furukawa, Yoshinori Watanabe
  • Storage managing computer and program recording medium therefor
    Publication number: 20040083401
    Abstract: A managing computer is connected to object computers, the managing computer being connected to the object computers and the storage which is connected to the object computers for managing the object computers and the storage. The managing computer includes an interface for receiving volume managing information relating to storage areas in the storage, file sharing information relating to file sharing in the storage which is provided by the object computers and storage managing information relating to the storage, and a control unit which specifies the object computers or the storage to be preset controlled according to the volume managing information, the file sharing information and the storage managing information for managing the object computers and the storage by instructing the specified object computers or the specified storage to carry out the preset control.
    Type: Application
    Filed: February 28, 2003
    Publication date: April 29, 2004
    Inventors: Hiroshi Furukawa, Yasunori Kaneda
  • Method of heat treatment of silicon wafer doped with boron
    Publication number: 20040048456
    Abstract: A method of subjecting a silicon wafer doped with boron to a heat treatment in an argon atmosphere, wherein the argon atmosphere is replaced with a hydrogen atmosphere or a mixed gas of an argon gas and a hydrogen gas in a proper fashion, to thereby uniformize a boron concentration in the thickness direction of the surface layer of the silicon wafer doped with boron.
    Type: Application
    Filed: June 2, 2003
    Publication date: March 11, 2004
    Inventors: Yuji Sato, Shirou Yoshino, Hiroshi Furukawa, Hiroyuki Matsuyama
  • Communication quality setting apparatus
    Publication number: 20040043755
    Abstract: A communication quality setting apparatus for guaranteeing communication quality of a computer to each storage area of a storage device in consideration of configuration of the storage device and a performance of each component. The apparatus includes a guaranteed performance generating unit for determining a performance value to be guaranteed for each storage area based on request information on guarantee of communication quality, a performance value to be guaranteed for an interface of the storage device, and a performance value to be guaranteed of the storage area of the storage device. The apparatus includes a guaranteed performance setting unit for guaranteeing quality of communication between the computer and the storage area by instructing a storage control unit to control location of data between the storage area and the interface according to the performance value to be guaranteed.
    Type: Application
    Filed: September 5, 2002
    Publication date: March 4, 2004
    Inventors: Kenichi Shimooka, Hiroshi Furukawa, Daisuke Shinohara
  • Storage device band control apparatus, method, and program
    Publication number: 20040010605
    Abstract: A network system includes a storage device and a plurality of information devices using storage regions of the storage device, in which the band control information required for performing the network communication band control is created in accordance with the band guarantee requirement information concerning the network communication band guarantee, the configuration information in the storage device and the performance information of the storage device. Furthermore, a band control execution device is instructed to execute the network communication band control in accordance with the band control information.
    Type: Application
    Filed: August 29, 2002
    Publication date: January 15, 2004
    Inventors: Hiroshi Furukawa, Daisuke Shinohara, kenichi Shimooka
  • Method and computer program for use in locating wireless base stations in a mobile communications system
    Publication number: 20030236092
    Abstract: When locating base stations which are wirelessly coupled with each other and establish one or more inter-cell wireless relay routes in a mobile communications system, the heights of directional antennas to be installed at the base stations are determined so as to be different, which base stations are adjacent with each other in a given inter-cell wireless relay route.
    Type: Application
    Filed: June 20, 2003
    Publication date: December 25, 2003
    Inventors: Koichi Ebata, Hiroshi Furukawa