Tdk Corporation

Nec Corporation

Ko Ito

Yukio Takahashi

Takuya Ono

Takanori Iwai

Hiroshi Harada

Shunsuke Maeda

Takuya Aoki

Kouki Sato

Hidenobu Umeda

Masahiro Onizuka

Akinori Ohi

Sei Kakinuma

Tatsuya Shimazaki

Bungo Sakurai

A location information management system includes: a mobile station () that is located in a mobile communication network; and a service management server () that receives a movement sensing request to sense a movement of the mobile station () from a service providing server (), the service management server () thereafter notifying the service providing server () that the movement of the mobile station () has been sensed upon an occurrence of the movement of the mobile station (). The mobile station () receives first area information included in information that is periodically transmitted to each mobile station located in the area, the mobile station () thereafter sensing that the mobile station itself has moved upon receipt of second area information, and the mobile station notifying the service management server () that the movement of the mobile station itself has been sensed.

Location information management system, mobile station, service management server, movement sensing method, and non-transitory computer readable medium

An object is to provide a communication control system, a service management server, a mobile station, a communication control method, and a program, with which the processing load of a network apparatus can be reduced in the case where a great number of communication apparatuses are concentrated. A communication control system of the present invention includes a mobile station concentration prediction unit () that predicts an area where a plurality of mobile stations () to () will be densely concentrated by movement of the plurality of mobile stations () to (), and a communication timing control unit () that determines a mobile station to be a communication timing controlled target out of the plurality of mobile stations () to () predicted to be densely concentrated in the area, and controls the communication timing of the determined mobile station.

Communication control system, service management server, mobile station, communication control method, and non-transitory computer readable medium

An oxide magnetic material comprising main constituents including FeO, ZnO, CuO and NiO. YOof 0.003 to 0.021 wt % and-ZrOof 0.06 to 0.37 wt % are included in main constituents with respect to all amounts. It is also preferable that Si of 0.010 to 0.0112 wt % is included in main constituents with respect to all amounts. Further, it is also preferable that YOof 0.001 to 0.011 wt % , ZrOof 0.031 to 0.194 wt %, and Si of 0.010 to 0.056 wt % are included in main constituents with respect to all amounts.

Method for producing an oxide magnetic material

There can be provided an NiCuZn-based ferrite material containing an iron oxide, a copper oxide, zinc oxide and a nickel oxide in predetermined amounts as main components and a bismuth oxide, a silicon oxide, magnesium oxide and a cobalt oxide in predetermined amounts as additional components. Due to the predetermined amounts of the additional components, the ferrite material has an extremely good temperature characteristic (a change in permeability along with a change in temperature is small), a high quality coefficient Q and high strength.

Ferrite material

To use a media agitating mill of a wet internal circulation type when grinding materials, and offer oxide magnetic materials and coils in which influences of ZrO and Y O mixing when using partially stabilized zirconia as media beads are improved. The magnetic materials and coils are characterized in that Fe O , ZnO, NiO and CuO are main components, and Y O , ZrO and Bi O are contained with respect to these main components, where an amount of Y O is 0.007 to 0.028 wt % for the total amount, an amount of ZrO is 0.12 to 0.55 wt % therefor and an amount of Bi O is 0.03 to 10.12 wt % for the same.

Oxide magnetic material, coil components using the same, and method for producing oxide magnetic materials and coil components

Ni&mdash;Cu&mdash;Zn based oxide magnetic materials, in that not only the internal conductor is stabilized at very low firing temperatures, but also the characteristics in the high frequency zones of 100 MHz or higher are excellent. The oxide magnetic materials comprises, Fe O : 35.0 to 51.0 mol %, CuO: 1.0 to 35 mol %, NiO: 38.0 to 64.0 mol %, ZnO: 0 to 10.0 mol % (including 0%) and Ca: 0.3 wt % or lower (not including 0%), and, optionally, CoO: 0.7 wt % or lower.

Oxide magnetic materials, chip components using the same, and method for producing oxide magnetic materials and chip components

An oxide magnetic material comprising main constituents including Fe O , ZnO, CuO and NiO. Y O of 0.003 to 0.021 wt % and ZrO of 0.06 to 0.37 wt % are included in said main constituents with respect to all amounts. It is also preferable that Si of 0.010 to 0.0112 wt % is included in said main constituents with respect to all amounts. Further, it is also preferable that Y O of 0.001 to 0.011 wt %, ZrO of 0.031 to 0.194 wt %, and Si of 0.010 to 0.056 wt % are included in said main constituents with respect to all amounts.

Oxide magnetic material and chip part

There is disclosed a BALUN transformer core material which has no magnetic permeability, contains a non-magnetic material and is not influenced by the frequency property of the magnetic permeability even in a high-frequency band. A BALUN transformer core which is obtained by pressing and sintering the BALUN transformer core material has no magnetic permeability and has a high specific resistance. A BALUN transformer which is obtained by applying a winding to the BALUN transformer core is a high-property BALUN transformer which can be operated in a high-frequency band of 600 MHz or more.

Growing community of inventors

Tokyo, Japan

Ko Ito