Abstract:
PROBLEM TO BE SOLVED: To perform fast communication at each radio terminal with a reduced packet collision frequency transmitted from a plurality of radio terminals.SOLUTION: A radio terminal T1 determines the number of slot arrays N by slot array number determination processing on deciding that no response packet is received from a master station M1 in a time zone after the slot of transmitting a registration request packet. Then the radio terminal T1 retransmits a registration request packet at any one of N slots arrayed in continuation on a time axis. The radio terminal T1 further retransmits the registration request packet on deciding that no response packet is received in a time zone after the slot of retransmitting the registration request packet. The radio terminal T1 varies the number of slot arrays N on the basis of the number of retransmission of the registration request packet in the past.
Abstract:
PROBLEM TO BE SOLVED: To provide a speaker, etc. capable of improving output characteristics concerning multiple frequency components and improving flexibility in design by not only miniaturizing a speaker itself but also attaining space saving in an internal structure of the speaker.SOLUTION: A speaker 100 includes: a compact speaker unit 10; and a housing 20 to which the speaker unit 10 is attached. The housing 20 includes: first resonance parts 30, a second resonance part 40, a third resonance part 50 for performing outputs by resonance concerning specified frequency components constituting output sound to be output from the speaker unit 10; and two openings, i.e., a first opening 60 and a second opening 70 that are the openings formed in predetermined surfaces, formed at output ends for outputting resonance sound of one resonance parts and formed in one of an output end of the other resonance means and the front surface of the speaker unit 10.
Abstract:
PROBLEM TO BE SOLVED: To provide a wireless communication system and method for suppressing the power consumption of a wireless tag. SOLUTION: A wireless reader communicates with a wireless tag by using a preamble frame 31 and an actual data frame 32. A preamble frame 31 to be transmitted by the wireless reader includes a bit synchronizing signal, a frame synchronizing signal 1 and a cycle counter, and the preamble frame is repeatedly transmitted. Also, an actual data frame 32 includes a bit synchronizing signal, a frame synchronizing signal 2, a tag ID, a control signal, and a CRC, and the actual data frame is repeatedly transmitted in the same way. Also, when any reply is necessary for the control signal, a reply is transmitted from the wireless tag to the wireless reader after transmission from the wireless reader ends. COPYRIGHT: (C)2010,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a wireless communication system capable of reducing the exchange of communication path information to the greatest extent by allowing a parent node to establish path information centered on a child node.SOLUTION: A wireless communication system 1 includes: child nodes 100-1 through 100-15 for retrieving various pieces of information; a parent node 300 for collecting information retrieved by each child node; and a PC (personal computer) 26 serving as a terminal which is capable of changing the setting of the parent node 300. The parent node 300 is connected to a monitoring center 700 via a public network 500. The parent node utilizes routing information necessary for polling from the parent node to the child nodes in order to generate routing information between the child nodes and forces the child nodes to store the information. The parent node 300 establishes path information centered on the child nodes 100 and registers the path information in the child nodes as static information in order to reduce the unnecessary exchange of communication path information.
Abstract:
PROBLEM TO BE SOLVED: To easily and surely determine the direction of a test tube, when carrying the test tube. SOLUTION: This test tube carrying device has a direction determining mechanism 30 for automatically determining the direction of the test tube to be transferred. When a front end part in the transfer direction of the test tube is a tip part, its front end part is butted against a tip detecting plate 32 positioned on the innermost side by passing through a determining opening formed in a tube port detecting plate 31, and moves its plate. When the front end part in the transfer direction of the test tube is a base end part, its front end part is butted against the tube port detecting plate 31 without passing through the determining opening formed in the tube port detecting plate 31, and moves its plate. The direction of the test tube is determined by detecting motion of respective motion members. Direction aligning control of the test tube is performed in response to its determining result. COPYRIGHT: (C)2011,JPO&INPIT