Hideki Shimada

Learn More
There have been many wireless sensors equipped IEEE 802.15.4. ZigBee, the most representative upper layer protocol of IEEE 802.15.4 is non-IP-based. However an IPv6 protocol called 6LoWPAN is currently being discussed by the IETF. Until now, IP stacks have generally been too large for sensor devices, which have weak calculating ability. Thus, most of(More)
The popularity of network home appliances that can interconnect with other home appliances through networks increases. The operation and function of these appliances are complex since they can share contents and data with other network home appliances. However, it remains difficult for users to identify network home appliances, since their locations are not(More)
There are various kinds of wireless network devices, such as cellular phone and wireless sensors, around us in a ubiquitous environment. Unlike a wired network, we cannot grasp the exact status of a wireless network in real space. Moreover, it is difficult to understand the relationships of connectivity intuitively, since network management software is used(More)
The popularity of home appliances continues to increase that can interconnect with other appliances through networks. For users who want to identify the network home appliances they want to operate, their operation is complex and difficult since their locations are not represented within the operating system. We propose Embodied Visualization with Augmented(More)
With the present technology and environment, we are able to interact with other people using online communities, while sometimes missing the opportunity to meet people in the real world. Location-based services have a strong correlation with the real world, and have the potential to develop online connections into off-line connections. However, most of(More)
As the Internet, computer technology, and peripheral devices continue to grow, web services for users are increasing, including such streaming video broadcast services as YouTube and Ustream that allow users to watch the streaming in which they are interested. In the current streaming video broadcast services, users search for streaming videos by title and(More)
OBJECTIVES We have designed a phantom to evaluate acquisition and reconstruction parameters using contrast transfer function (CTF). The goal of this study was to evaluate the accuracy of the phantom for contrast resolution. METHODS The phantom consisted of spaced (0-14 mm, 1 mm intervals) pairs of cubic containers (5 mm wide, 20 mm long, and 50 mm high).(More)