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— The popular IEEE 802.11 Wireless Local Area Network (WLAN) is based on a Carrier Sense Multiple Access with Collision Avoidance (CSMA/CA), where a station listens to the medium before transmission in order to avoid collision. If there exist stations which can not hear each other, i.e., hidden stations, the potential collision probability increases, thus(More)
The popular IEEE 802.11 WLAN is known to achieve relatively small throughput performance compared to the underlying physical layer (PHY) transmission rate. This is due mainly to the large overheads composed of medium access control (MAC) header, PHY preamble/header, backoff time, acknowledgement (ACK) transmission, and some inter-frame spaces (IFSs). Since(More)
I n addition to the wireless telephony boom, a similar exponentially increasing trend in wireless data service— for example, short message service (SMS)—is visible as technology advances. We develop a structural model to examine user demand for voice service and SMS. Specifically, we measure the own-and cross-price elas-ticities of these services. The(More)
WLAN technology has been shown a revolutionary development during the last decade. Recently popularized IEEE 802.11a/g-based products can support up to 54 Mbps PHY (Physical layer) rate and give much freedom to access the Internet wirelessly. However, the 802.11 MAC (Medium Access Control) protocol has relatively large overhead in order to robustly deal(More)
In this paper, we present a real application system based on wireless sensor network (WSN) for fence surveillance which is implemented on our development platform for WSN, called ANTS (An evolvable Network of Tiny Sensors). Our system, called the WFS system, is expanded to connect and control a robot (UGV/UAV) and a camera sensor network for the purpose of(More)
Alzheimer's disease (AD) is characterized by the transition of amyloid-β (Aβ) monomers into toxic oligomers and plaques. Given that Aβ abnormality typically precedes the development of clinical symptoms, an agent capable of disaggregating existing Aβ aggregates may be advantageous. Here we report that a small molecule,(More)
Canonical transient receptor potential (TRPC3) nonselective cation channels are effectors of G-protein-coupled receptors (GPCRs), activated via phospholipase C-diacylglycerol signaling. In cerebellar Purkinje cells, TRPC3 channels cause the metabotropic glutamate receptor (mGluR)-mediated slow EPSC (sEPSC). TRPC3 channels also provide negative feedback(More)
(University of Tokyo) for their helpful assistance and comments. Special thanks go to Peter Drysdale, Hal Hill and Mark Dodgson (the Australian National University) for their special guidance and support. I am also grateful to Tack-Myong Kim and Chang-Sik Yoon for their assistance. The author is indebted to Samsung Economic Research Institute and Samsung(More)