After large-scale disasters, information sharing among people becomes more important than
usual. This, however, is extremely difficult to achieve in disaster zones due to serious …

When a large-scale disaster happens, efficient network connection and communication
becomes difficult due to serious damage of existing network infrastructures. Meantime …

With the development of wireless communication techniques and mobile environment we
are able to transmit data between mobile systems without restriction of time and space …

(in English) Local governments are required to respond to large-scale and diverse natural
disasters promptly and appropriately. Local governments of Japan use the disaster …

During the last ten years, social networking has become an integral part of modern society.
People use the wide range of available social networking services to create relationships …

In distributed processing for communication services, a proper server selection scheme is
required to reduce delay by ensuring the event occurrence order. Although a conservative …

Mobile distributed systems (MDS) deal with data transmissions among geographically
distributed mobile sources. In this environment, the preservation of temporal dependencies …

When data may be accessed and updated simultaneously, locks are used to prevent data
from being accessed in an inconsistent state. For example, if data is changed while the data …

In distributed processing for communication services, a proper server selection scheme is
required to suppress delay by ensuring the event occurrence order. Although a conservative …

Our experiences in East Japan Earthquake show that disasters will cause a large-scale
network interruption due to serious damage of existing network infrastructures. To enable …