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We investigated the symbiont-bearing benthic foraminifer Palaeonummulites venosus to determine the chamber building rate (CBR), test diameter increase rate (DIR), reproduction time and longevity using the ‘natural laboratory’ approach. This is based on the decomposition of monthly obtained frequency distributions of chamber number and test diameter into normally distributed components. Test measurements...
Along with the rapid increasing use of wireless LAN (Wi-Fi) enabled devices, nowadays it is becoming possible for users to exchange data wirelessly without the need of network infrastructure. Therefore, during disaster time when network infrastructure is not available, utilizing Wi-Fi as a means for information sharing to those in the disaster affected area can be a promising solution. Especially,...
A wireless LAN roaming system enables a user to access to a wireless network at a visiting institution with his/her account issued by his/her home institution. In the roaming system, an appropriate access privilege control is required. However, the conventional privilege authorization system gets unavailable because of some communication failures between institutions. In this work, we develop a fault-tolerant...
Recently, mobile devices with wireless LAN function become widely used as communication tools. These devices are also recognized to be useful for communication and information gathering at stations and refuges in case of emergency such as disaster, so each institution is expected to temporarily open its access points (APs) for all users in such cases. However, for security, each institution needs...
A flexible access control mechanism with user authentication is required for campus wireless LAN roaming. In general, VLAN tagging and firewall are adopted to realize it. However, the scalability of the conventional VLAN mechanism is low for a large system. An OpenFlow-based system was proposed to solve the problem. In this paper, we point out some limitations of the conventional system, and propose...
Many institutions have recently deployed the international wireless LAN roaming infrastructure called eduroam. Utilizing eduroam, users can obtain network connectivity across campus. However, the current eduroam infrastructure does not provide enough functions for flexible access control such as controlling the access to visited institution's local resources or restricting the access to some Internet...
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