Toshiyuki Moriyama

Comprehensive flood control involving citizens in a Japanese watershed

In July 2009, the city of Fukuoka, Japan experienced a flood disaster along the Hii River, which runs through densely populated, concrete-covered areas of the city. The drainage system was overwhelmed and the river overflowed due to heavy rainfall and rapid runoff. The event led citizens in its watershed to plan and implement comprehensive flood control. The plan aims not only to mitigate floods but also to revitalize the river environment and populated communities in urban areas. This study reports the activities led by the citizens. They organized and carried out civic forums, workshops, and fieldwork to share views as to how the flood disaster was caused, how floods in the watershed should be controlled, and how the river environment should be rehabilitated. This study illuminates how people, including the flood victims and municipal engineers, can change drastically and communicate effectively in the course of discussing and implementing the comprehensive flood control measures.

Open DNS Resolver Activity in Campus Network System

We statistically investigated the total A-resource record (RR) based DNS query request packet traffic from the campus network system to the top domain DNS server in a university during January 1st to December 31st, 2014. The obtained results are: (1) we found significant query keyword based entropy changes in the total DNS query request traffic at February 5th, 2014. (2) In the total A-RR based DNS query request packet traffic, we observed 73-90% of unique random query keywords including eleven source IP addresses like a Kaminsky-like random query (KLRQ) attack. (3) Also, we found that the source IP addresses were assigned to the home/broadband routers in campus laboratories, as open DNS resolvers. (4) Also, we calculated frequency distribution of the Levenshtein distance between the DNS query keywords and the peaks that were observed at 10-15 per day. Therefore, we can conclude that the Levenshtein distance model is useful for developing a detection model of open DNS resolvers.

Live Demo: Sensor network system for rainwater grid: APCCAS track selection: System and networks for safe and secure life

We have proposed a water disaster prevention mesh network - Rainwater Grid (RGS) [1]. It utilizes the water storage function of tanks to temporarily store rain water during heavy rainfalls. This will reduce the amount of water flowing into the rivers and the ground and suppress the flood damage. In this paper, we explain our design and development of the Smart Rainwater Tank System (SRT). We have confirmed that the system continuously monitors the water level of the tank, stores data and visualizes it as a webpage[2]. It will be pre-discharge when heavy rainfall is predicted. This prediction will be made by pattern recognition of weather data by Self Organized Map (SOM). Live Demo shows to sensing and control of the multiple model tanks as Rainwater Grid System. This concept is recently proposed as Distributed Multi-purpose Civil Dam and is advanced.

DNS ANY Request Cannon Activity in DNS Query Packet Traffic

We statistically investigated the total ANY resource record (RR) based DNS query request packet traffic from the Internet to the top domain DNS server in a university campus network through January 1st, 2011 to December 31st, 2012. The obtained results are: (1) We found a significant increase in the inbound ANY RR based DNS query request traffic at November 28th, 2011. (2) In the DNS query request packet traffic, we observed only a query keyword of the campus domain name. (3) We found a correlation between the total inbound DNS query request packet traffic and the DNS query request packet traffic including the query keyword. (4) Also, we carried out the loading test sending ANY, A, and PTR RR unique DNS queries to a test DNS server, we observed no difference among the vmstat parameters, and the load value was 0.10-0.20. These results indicate that the ANY RR based DNS request packet traffic is quite strange. However, it should be meaningless activity.