Abstract:
In a wireless packet transmission system that includes multiple wireless basestations and one or more wireless terminals belonging to one of the wireless basestations, transmission trees extending from two or more wireless basestations as root stations are used. Each of the wireless basestations has a tree table configured to record the root stations in association with the ID information about the transmission trees. When receiving a packet, each of the wireless basestations determines the transmission tree to be used for the packet transmission, and transmits the packet to a next node along the determined transmission tree.
Abstract:
A channel allocation method for dynamically allocating channels of a plurality of radio interfaces at each access point included in a mesh network is provided. The method includes the steps of (a) acquiring, at each access point, in-node information about the access point itself, and (b) grouping high-traffic access points in a cluster using a same channel set based on the acquired information.
Abstract:
An ionic polymer composite device and methods for fabricating the ionic polymer composite device are provided. The ionic polymer composite device includes two extended electrode layers, each extended electrode layer including at least one ionic polymer with a plurality of electrically conductive particles, and a dielectric layer including at least one sulfonated poly ether sulfone polymer or a derivative between the two extended electrode layers.
Abstract:
A wireless communications apparatus used in a wireless communications network consisting of multiple wireless communications apparatuses mutually connected via wireless links includes (a) a buffer configured to temporarily store information received from an adjacent wireless communications apparatus or a user terminal located under the wireless communications apparatus; (b) a routing control information processing unit that estimates a node cost representing traffic at the wireless communications apparatus and a link cost representing a radio condition of the link to determine a transmission route based on cost information reflecting both the node cost and the link cost; and (c) a routing control unit that designates a next hop to which information accumulated in the buffer is to be transmitted according to the determined transmission route.
Abstract:
A phase-separated polymer electrolyte membrane is provided which has a low degree of swelling in water and methanol, excels in resistance to water and methanol, and has high methanol barrier property and a low membrane resistance. An electrode-phase-separated polymer electrolyte membrane joint using the membrane, a method for manufacturing the membrane and joint, and a fuel cell using them are also provided. There is provided a polymer electrolyte membrane having two phases: a domain phase comprising an electrolyte polymer (a) and a matrix phase comprising a polymer (b) that inhibits swelling of component (a), the membrane also having a three-dimensional structure that can conduct protons and substantially connects the domains of (a).
Abstract:
A channel allocation method for dynamically allocating channels of a plurality of radio interfaces at each access point included in a mesh network is provided. The method includes the steps of (a) acquiring, at each access point, in-node information about the access point itself, and (b) grouping high-traffic access points in a cluster using a same channel set based on the acquired information.
Abstract:
Provided is a mobile communication system capable of determining a communication path to implement fast communication by multihop connection. A mobile communication system (1) comprises a mobile station (10), at least one relay station (30), and a base station (20) and implements packet transmission from the mobile station (10) to the base station (20) through a communication path with an intermediary of at least one relay station (30) or through a communication path without an intermediary of a relay station. The mobile communication system (1) is provided with a communication path determiner for determining a communication path with a largest communication speed or a communication path satisfying a required line quality, based on interference levels of respective signals received at a relay station (30) constituting a communication path between the transmitting station and the receiving station, and at the base station (20).
Abstract:
The present invention provides an electrolyte membrane in which permeation of an electrolyte solution such as water and methanol, and swelling by electrolyte solutions are suppressed, and which is excellent in mechanical strength; and providing a preparing method thereof. The present invention relates to an electrolyte membrane comprising a porous substrate with a plurality of pores and a proton conductive polymer composition held in the pores, wherein the proton conductive polymer composition contains an aromatic hydrocarbon resin having proton acid groups, preferably an aromatic hydrocarbon resin selected from a group consisting of polysulfone, polyethersulfone, polyarylate, polyamide imide, polyetherimide, polyimide, polyquinoline, and polyquinoxaline.
Abstract:
A semiconductor chip is attached to a lead frame with a filmy organic die-bonding material having a water absorption of 1.5% by volume or less; having a saturation moisture absorption of 1.0% by volume or less, having a residual volatile component in an amount not more than 3.0% by weight, having a modulus of elasticity of 10 MPa or less at a temperature of 250° C. The semiconductor device thus obtained can be free from occurrence of reflow cracks during reflow soldering for the packaging of semiconductor devices.
Abstract:
A communication apparatus is disclosed, which includes an information collection unit, a storage unit, a selection unit, and a route control unit. The information collection unit is configured to collect route information and condition information. The storage unit is configured to store the route information and the connection information. The selection unit is configured to select a connection apparatuses for a terminal apparatus based on the route information and the connection information. The route control unit is configured to control routes from the communication apparatus to the connection apparatus.