公开(公告)号：JP2001195031A

公开(公告)日：2001-07-19

申请号：JP34222199

申请日：1999-12-01

Applicant: IBM

Inventor： SAKAGUCHI YOSHITAMI ,  MIZUTANI MASAHIKO

IPC: G02F1/133 ,  G09G3/20 ,  G09G3/36 ,  G09G5/02 ,  H04N5/202 ,  H04N9/69

Abstract: PROBLEM TO BE SOLVED: To reduce the number of inputs of a LCD(liquid crystal display) driver chip and to suppress the variation among chips to be small. SOLUTION: A 10-bit 2-ary counter 202 free-runs in synchronism with a system clock. A 10-bit 5-staged shift register 200 stores the gamma correction data received from a PC. Comparators 204 compare the value X of the 2-ary counter 202 with values Ys stored in 10-bit registers to convert the gamma correction data into pulse widths. Outputs of the comparators 204 are latched in D-FFs 206 in synchronism with the system clock. Time-voltage transforming units 208 generate reference potentials for gamma correction by subjecting outputs of the D-FFs 206 to LPFs.

公开(公告)号：JP2001156787A

公开(公告)日：2001-06-08

申请号：JP31926199

申请日：1999-11-10

Applicant: IBM

Inventor： MIZUTANI MASAHIKO ,  SHIMOTOONO SUSUMU ,  AIHARA TATSU

IPC: H04B7/26 ,  H04B17/345 ,  H04L12/28 ,  H04W8/00 ,  H04W16/26 ,  H04W24/00 ,  H04W24/08 ,  H04W84/12 ,  H04W84/18

Abstract: PROBLEM TO BE SOLVED: To provide a method and a device that can efficiently retrieve a wireless station in existence around the device in a network, especially in a wireless ADHOC communication network. SOLUTION: A master node 710 includes a protocol stack 715, a transceiver 720, a retrieval scheduler 725, a traffic prediction means 730, and an out-channel interference signal strength measurement means 735 as major components, and a slave node 750 includes a protocol stack 760, a transceiver 765, and a retrieval routine 755 as major components. An interference strength measurement means 735 informs a retrieval scheduler 725 about the strength of an interference signal measured by the interference strength measurement means 735 and the retrieval scheduler 725 decides the total amount of the resource assigned to the retrieval on the basis of the measured strength of the interference signal.

公开(公告)号：JPH11112524A

公开(公告)日：1999-04-23

申请号：JP28021497

申请日：1997-10-14

Applicant: IBM

Inventor： MIZUTANI MASAHIKO ,  ISHIKAWA HIROSHI ,  AMURITO R PANTO

IPC: G06F13/00 ,  H04L12/28 ,  H04L29/08 ,  H04W74/04 ,  H04W84/12 ,  H04W88/00

Abstract: PROBLEM TO BE SOLVED: To easily attach/detach and move a device by transmitting a connection request packet containing self-identification information in response to the reception of a packet showing connection permission from a first radio equipment, receiving a connection permission packet and setting it through the use of path information in accordance with the reception of the packet which is not reception-designated. SOLUTION: When the reading of data is instructed from a computer 1, a USB controller 33 outputs a USB packet containing necessary data to USB 31 and a USB interface unit B27 receives it. A control unit M25 controls the transmitter of a radio transmitter/receiver B23 so that it transmits the radio packet of an appropriate system. The receiver of a radio transmitter/receiver A21 receiving the radio packet containing data from a device 7 informs a control unit A17 of the reception of data and stores data in a buffer 19.

公开(公告)号：JP2002044003A

公开(公告)日：2002-02-08

申请号：JP2000205724

申请日：2000-07-06

Applicant: IBM

Inventor： AIHARA TATSU ,  SHIMOTOONO SUSUMU ,  MIZUTANI MASAHIKO

IPC: H04B7/24 ,  H04W24/00 ,  H04W24/08 ,  H04W84/12 ,  H04W84/20 ,  H04L12/28

Abstract: PROBLEM TO BE SOLVED: To enable network communications to be automatically and optimally carried out in radio ad hoc communications. SOLUTION: A communication terminal is formed as one of a plurality of nodes which constitute a cluster and serves as a cluster head capable of holding communication with the other cluster members or residual nodes and equipped with a cluster head suitability judgment device 11 for grasping the state of link with the cluster members, a cluster head shift schedule forming device 12 which forms a schedule table 15 for assigning the cluster members successively for a tentative cluster head, a link state suitability monitoring device 21 which recognizes the state of link with the other nodes when a cluster member becomes a tentative cluster head, and a cluster reconstruction device 26 which reconstructs the cluster, resting on the basis of the state of link grasped and recognized.

公开(公告)号：JP2001285345A

公开(公告)日：2001-10-12

申请号：JP2000076883

申请日：2000-03-17

Applicant: IBM

Inventor： MIZUTANI MASAHIKO ,  HONDA RYOJI ,  KATSUNO KYOJI

IPC: H04L12/28 ,  H04L12/70 ,  H04L12/701 ,  H04M3/42 ,  H04W4/06 ,  H04W4/16 ,  H04W8/26 ,  H04W28/00 ,  H04W40/34 ,  H04W72/12 ,  H04W74/08 ,  H04W84/04 ,  H04W84/12 ,  H04W84/18 ,  H04L12/56 ,  H04Q7/38

Abstract: PROBLEM TO BE SOLVED: To realize an interactive communication in an on demand communication in heavy movement for a party consisting of uncertain terminals sharing subjects, a reduction of traffic in a network in the same group so as to reduce power consumption of communication terminals. SOLUTION: In the communication terminals 101-116 realizing group communication of radio ad hoc network of which the connection is rearranged by movement of the terminals 101-106 with high frequency in comparison to that of communication packet, an identification information and an expiry data information of an adjacent terminal together with an expiry date of own station in which the date itself belongs to the group are stored into a group managing table 11, and a transmitting receiving device 20 adds an identification information of itself, also adds the date information of the group based on the expiry date information stored in the table 11 so as to make packet transmission.