Yukihiro Fujimoto

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This paper describes sleep and adaptive link rate (ALR) control functions to reduce the power consumption of optical network units (ONUs) in 10 Gb/s Ethernet passive optical network (10G-EPON) systems. A hybrid mechanism that includes both sleep and ALR control functions is proposed with a view to further improving the power-saving performance. The sleep(More)
This paper proposes a power saving mechanism with variable sleep period to reduce the power consumed by optical network units (ONUs) in passive optical network (PON) systems. In the PON systems based on time division multiplexing (TDM), sleep and periodic wake-up (SPW) control is an effective ONU power saving technique. However, the effectiveness of SPW(More)
Hypertension and insulin resistance are associated with reduced coronary vasodilatory capacity, possibly caused by structural changes in the coronary resistance vessels. The goal of this study was to compare the effect of an angiotensin receptor blocker (ARB) with that of a calcium channel blocker (CCB) on coronary flow reserve and insulin resistance among(More)
This paper proposes a novel power-saving mechanism for the 10 Gbit/s Ethernet passive optical network (10GEPON) systems that are currently being discussed in IEEE 802.3av. The proposed power-saving mechanism includes a sleep control function and an adaptive link rate (ALR) control function. The sleep control function switches the modes of optical network(More)
Autonomic failure is rare in patients with Sjögren syndrome (SS). We report the case of a 46-year-old woman with severe autonomic cardiovascular failure, manifested by incapacitating postural hypotension, as the first symptom of primary SS. Treatment with glucocorticoid resulted in a dramatic improvement of her symptoms and objective findings of autonomic(More)
The number of the high-speed Internet access users, those with broadband access, has reached 20 million. Of particular interest is the significant growth introduction number of fiber-to-the-home (FTTH) access users. Commercial FTTH in Japan started in 1997 and provides residential planeold-telephone-service (POTS) and CATV signals transmission by using a(More)
This paper proposes and demonstrates an optical network unit (ONU) that is adaptive in both point-to-point (P2P) and point-tomultipoint (P2MP) optical access networks (OANs) based on Gigabit Ethernet. Use of the proposed ONU makes it possible for network operators to reduce their operational expenditure (OPEX) by controlling/managing necessary inventories(More)
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