Mitsubishi Electric Corporation

Mitsubishi Materials Corporation

Mitsubishi Materials Silicon Corporation

Yuji Miyake

Tetsuya Aoyama

Masao Oga

Kouji Maeda

Ryo Matsunaga

Jun-ichi Matsubara

Hiroshi Kongoji

An interface conversion apparatus includes processing circuitry. The processing circuitry measures communication quality inside the mobile communication system. The processing circuitry refers to evaluation index information specifying, for each communication group, an allowable range of variation in the measurement result of the communication quality and a fluctuation adjustment time, and determines the communication group in which a variation in the measurement result of the communication quality obtained from history information including a measurement result falls within the allowable range for each piece of identification information included in the packet. The processing circuitry selects the communication group of the packet received from the identification information of the packet received, based on a correspondence relationship between the communication group determined and the identification information of the packet. The processing circuitry controls the packet received for each communication group, using the fluctuation adjustment time in the evaluation index information corresponding to the communication group determined.

Interface conversion apparatus for a mobile communication system

The wireless relay device according to the present disclosure includes: a reception unit to receive train control information; an information classification unit to classify the train control information into first control information requiring immediacy and second control information not requiring immediacy; a message generation unit to generate one message from the first control information contained in a piece of the train control information and to generate one message from a plurality of pieces of the second control information contained in a plurality of pieces of the train control information; and a transmission unit to transmit the messages generated by the message generation unit. With this configuration, it is possible to reduce the number of the data transfer messages which does not require immediacy while the instantaneous communication for the control information which requires immediacy is maintained.

Wireless relay device, and memory to store program for controlling wireless relay device

In a wireless communication system including a plurality of wireless base stations, the wireless base stations other than the uppermost wireless base station among the plurality of wireless base stations each determine a frame timing on the basis of synchronization timing information received from the upper wireless base station, and the wireless base stations other than the lowermost wireless base station among the plurality of wireless base stations each notify the lower wireless base station of the synchronization timing information. A communication path from the uppermost wireless base station to the lowermost wireless base station includes a branch point and a merge point, and a junction base station that is the wireless base station installed at the merge point measures a synchronization error between a priority synchronization path and a non-priority synchronization path different from the priority synchronization path, the priority synchronization path being one of a plurality of the communication paths from the branch point to the merge point. Each of the plurality of wireless base stations installed on the non-priority synchronization path adjusts the frame timing on the basis of the synchronization error.

Wireless communication system, wireless communication method, and storage medium of the system

A silicon single-crystal ingot which is nearly uniform in quality over the entire length of the column portion can be obtained to produce high-quality single-crystal silicon with high product yield and has the bottom column portion having the property close to the properties of the top column portion and the middle column portion. The bottom portion does not vary in shape among product lots and can be reproduced in the same shape. The diameter D2 of the bottom portion 2 is controlled in such a manner that the outer surface of the bottom portion 2a on the column portion side has an inclination angle .theta. of 10 to 25 degrees with respect to the outer surface of the column portion 1 and extends to the outer surface of the column portion.

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Tokyo, Japan

Yuji Miyake