Atsushi Fujiwara

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We provide a design framework for hop-by-hop congestion control algorithms in wireless mesh networks. Mesh networks are becoming increasingly popular and standardization process for development of IEEE 802.11 based mesh networks is an ongoing effort (in 802.11 Task Group S). However, by use of an existing CSMA/CA MAC in such networks, application sources(More)
This paper proposes a Multi-hop Radio Access Cellular (MRAC) scheme for achieving both high-speed/high-capacity and good area coverage in fourth generation mobile communications systems. In this scheme, we assume two kinds of hop stations, one is a dedicated repeater station installed at a good propagation location such as a rooftop, and the other is a user(More)
We present a 32-bit RISC microcontroller having an on-chip DC/DC converter. The chip standby power including the DC/DC converter is reduced to 63µW with a new hybrid regulator scheme in which the microcontroller selects a switching regulator in active mode and a series regulator in standby mode. The achieved standby power corresponds to only about 1% the(More)
BACKGROUND Transurethral resection of the prostate (TURP) involves the risk of transurethral resection (TUR) syndrome owing to hyponatremia. Irrigation fluid type, duration of operation, and weight of resected mass have been evaluated as risk factors for TUR syndrome. The purpose of the present study was to identify risk factors related to TUR syndrome in(More)
BACKGROUND This study aimed to investigate the relationship between preoperative estimated prostate weight on ultrasonography and clinical manifestations of transurethral resection (TUR) syndrome. METHODS The records of patients who underwent TUR of the prostate under regional anesthesia over a 6-year period were retrospectively reviewed. TUR syndrome is(More)
BACKGROUND Patients undergoing transurethral resection (TUR) of the prostate are at risk of TUR syndrome, generally defined as having cardiovascular and/or neurological manifestations, along with serum sodium concentrations less than or equal to 125 mmol/l. As these symptoms can also occur in patients with serum sodium greater than 125 mmol/l, this study(More)