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Belle II, an experiment designed to search for physics beyond the standard model in the decay of mesons, will soon start operation at the Super KEKB collider. The trigger rate is expected to be 30 kHz with a margin of 10 kHz, and the raw data rate will exceed 30 GB/s. Since the system will be unable to record all data on its storage system, online reduction is required. We have developed...
The Belle II experiment is an e+e− collider for the search physics in the decays of B mesons, and it will start the operation in near future. The trigger rate is expected as 30 kHz and the raw data rate will exceed 30 GB/s. It is unable to record the data on the storage system, thus the online reduction is indispensable. We have developed a three-level event building system using inexpensive box switches...
NAND flash memory is widely used in digital cameras, USB devices, cell phones, camcorders and solid-state drives. Continuous lowering of bit cost, increasing flash-memory-die densities and improving performance have helped to expand flash markets. Recently, there are two different directions to meet market demands. One is lowering bit cost and increase memory density to the utmost limit, which is...
NAND flash memories are now indispensable for our modern lives. The application range of the storage memory devices began with digital still cameras and has been extended to USB memories, memory cards, MP3 players, cell phones including smart phones, netbooks, and so on. This is because higher storage capacity and lower cost are realized through means of technology scaling every year. Emerging markets,...
This paper proposes a novel spectrum sharing technique for an existing wireless local area network (LAN) system (primary user) based on IEEE 802.11a, and a new system (secondary user) equipped with the proposed spectrum sharing technique. Both systems are assumed to behave according to carrier sense multiple accesses with collision avoidance (CSMA/CA) protocol. An objective of spectrum sharing techniques...
In cognitive radio systems, secondary users are allowed to use the spectrum allocated to some primary user if they do not cause harmful interference to the primary user. This is called as a spectrum sharing. In the conventional spectrum sharing, the secondary user senses the spectrum and makes a binary decision: the spectrum is either available or not. In this approach, fixed transmit power has been...
Recently, wireless ad hoc communication systems have been receiving attention. In order to improve the efficiency of such networks, researchers have tried to apply adaptive array antennas (AAA) for interference cancellation in the space domain. In this paper, we propose a new method based on a new concept, called cross-degree of freedom (CDOF), for the application of AAA to ad hoc communications....
Wireless ad hoc networks attract interests of researchers. In such networks, data packets are relayed by nodes from a source node to a destination node. This is referred to as multi-hop communication. For such system, it is known that the IEEE802.11 DCF is not efficient. Then, in order to improve the efficiency, several methods were proposed conventionally. However, most of them are not aware of realistic...
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