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In a wireless mesh network (WMN) connected to the outer infrastructure such as the Internet, one or more gateways to connect to the outer network as well as surrounding nodes may frequently be congested by concentration of traffic from mobile stations. To resolve the congestion, we propose a new congestion control scheme for layer 3 WMNs. In the proposed scheme, nodes composing WMN backbone (MNs:...
Mobile learning has become a useful method of learning and teaching in Japan. We present in this paper how to integrate mobile devices such as cell phones, iPod Touch and iPhone, portable game devices and other peripheral tools with an eLearning system to enhance students' mobile learning at both on and off-campus activities.
The explosive growth in Internet traffic will lead to a demand for greater capacity. Wavelength-division-multiplexing (WDM) transmission using a broad wavelength region is considered a promising candidate transmission technology with which to meet this demand. Photonic crystal fibers (PCF) are attractive in terms of realizing wideband WDM transmission because they have unique features that are unavailable...
In aging societies such as Japan's, the number of elderly person living alone increases. Since the incidence of disease and injury increases with aging, remotely located family members become anxious about the safety of their elderly parent. The elderly parent is conversely eager for information about the remotely located family. To improve smooth communication between the elderly parent and the remotely...
A simple system for telemonitoring the daily life of an aged person living alone was developed. The system consists of a current sensor and a pair of computers. The sensor detects changes in the power line current of electrical appliances. The computer at the aged person's end transfers the output signal of the sensor every minute to the computer at the family end via the Internet. In this preliminary...
Creating an effective laboratory experience can prove challenging for instructors who require a variety of hardware platforms for unique problems. Some of these platforms often have many elements that are not central to the laboratory and can obfuscate the student's learning objectives. Others have a significant amount of integration complexity that inhibit students from focusing on development. This...
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