Go Hirakawa

A Large Scale Gathering System for Activity Data with Mobile Sensors

In this paper, we show a large-scale activity gathering system with mobile sensor devices such as smart phones and accelerometers. We gathered over 35,000 activity data points from more than 200 people over approximately 13 months. We describe the design rationale of the system, and analyze the gathered data through statistics, clustering, and application of an existing activity recognition method. Our results show that there is a challenging field for activity recognition in larger-scale activity data.

A road condition monitoring system using various sensor data in vehicle-to-vehicle communication environment

In order to keep the residents and drivers safety from natural disasters as well as traffic hazards such as heavy rainfall, snowfall and white-out, it is very important to monitor, understand and share quick road condition in the wide area in real-time. However, especially after a disaster has occurred, due to damage of communication infrastructure and network traffic congestion, the areas where the information with the road conditions are quite limited only by mass media. In this study, we develop a road condition monitoring system using multiple sensor data considering various communication environments. Using this system, monitoring, understanding, recording and sharing a wide range of road conditions can be realised multiple sensor data and exchanging those through vehicle-to-vehicle communication method between each vehicle and providing as a web application. The configuration and architecture of our proposed system are precisely explained. In order to verify the effects and usefulness of the proposed system, an experimental prototype is built and evaluated the function and performance. Through experimental evaluation, the superiority and problems to be improved are discussed.

Gathering Large Scale Human Activity Information Using Mobile Sensor Devices

In this paper, we show current status of gathering large scale human activity information using mobile sensor devices. If human activity can be objectively measured, we can expect various applications, such as health care and agriculture. We developed an activity information gathering system using mobile sensor devices with three axis accelerometers, and gathered about 10,000 activity data of 170 people during 5 months so far. As a result, we found specific activities which are easily gathered and ones which are not. Moreover, we found some problems of motivation measures.

Application of DTN to the Vehicle Sensor Platform CoMoSE

Time-Spacial automotive sensor data from various environmental and internal information of a vehicle is used for many vehicle control functions and services for passengers. To handle such time-spacial sensor data, we propose and develop an automotive sensor information platform named CoMoSE, which provides the utilized methods of automotive sensor information and serves the various services. In this paper, we propose a DTN communication using CoMoSE platform to establish information gathering method in the case of Large-scale disaster.

Application of Automotive Sensor Information Server Platform to Ubiquitous Sensing System

In Japan, an effective disaster control is needed because Japan is prone to severe disasters including earthquakes, tsunami, typhoon, heavy rain and snow. Application of the ubiquitous sensing system is expected to be an effective disaster prevention system in disaster-prone Japan. In this paper, we examine the possibility to apply COMOSE (Co-Operative Mobile Sensor Environment) platform that collects automotive sensor information using the wireless plug-and-play technology to the ubiquitous sensing system.

Omnidirectional Video and Sensor Data Collection and Distribution System on Challenged Communication Environment

Japan is prone to natural disasters occurring including earthquakes, tsunami, typhoon, heavy rain and snow. A wide range and quick information gathering systems are needed after a disaster has occurred. In addition, wireless networks are very useful at a disaster has occurred. By using wireless networks, we can build a network quickly using moving vehicles. But there is a challenging communication environment in hilly and mountainous areas and after a disaster has occurred where communication is completely disabled. In this paper, we introduce SODiCS (Spatial and Temporal Omni directional Video Distribution and Collection System) for challenged communication environment. Data gathered using Omni directional camera and sensor is transmitted to all of the users through a web application. The user can see the data gathered on GIS map as a web service. We equipped the system with two modes of video distribution functions, Live View mode and Storage View mode. The system configuration and architecture are explained and a prototype system is constructed to evaluate the performance of our system.

Automotive Sensor Network Platform for Disaster Information System

In this paper, we introduce a disaster area information gathering and distribution system SODiCS, which is expected to be an effective disaster prevention system in disaster-prone Japan. Moreover, we introduce automotive sensor data platform COMOSE, which can easily handle multiple sensor nodes. Subsequently, we declare functional requirements of SODiCS system and show that it is possible to implement SODiCS system of over COMOSE platform.

Data Gathering System for Recommender System in Tourism

The advance in the mobile terminal and wireless communication environment enables practical use of recommendation systems in tourism. A recommender system is a kind of information filtering system that helps users to find the optimal information from vast amounts of information using user preferences, environmental contexts, and user contexts. To carries out the optimum recommendation, Recommender system requires well-developed contents repository and a large amount of labeled training data. However, such travel contents and travel context information as training data has not fully digitized even in famous tourist cities let alone in the countryside. In this paper, we introduce an architecture of a tourist support information system including VR contents that are aimed at promoting Iwate area in Japan. Also, we propose a system for gathering contents repository and training data to construct regional specific recommender engine on the tourist support system.

IEEE802.11 Based Vehicle-to-Vehicle Delay Tolerant Networks for Road Surveillance System in Local Areas

In northern areas, the road conditions during the winter especially in mountain areas are one of the significant safety subjects for the residences and the tourists. In addition, there are some areas that the network services such as LTE or 3G are unavailable to use in mountain areas. For this reason, this paper proposed the Vehicle-to-vehicle (V2V) communication methods with the Delay Tolerant Networks (DTN) for the road surveillance system. In the proposed network system, IEEE802.11b/g/p is supposed for introducing the wireless V2V system, and the observed road conditions data is transmitted with the DTN routings. For the efficiency of the proposed network system, the GIS road maps of Takizawa in Japan are introduced for the computational simulations. Also, various DTN routings such as the Epidemic, the Spray and Wait, and the Maxprop routing are held for the future studies of the V2V based DTN routings of the road surveillance system in local areas during the winter.

Road-to-Vehicle Communication Using CoMoSE for Road Surface Freezing Information System

Recently, the number of automotive sensors has increased with the spread of electronic control systems such as driver assistance functions, navigation systems and hybrid systems. Time-Spacial automotive sensor data from various environmental and internal information of a vehicle is used for many vehicle control functions and services for passengers. To handle such time-spacial sensor data, we propose and develop an automotive sensor information platform named CoMoSE, which provides the utilized methods of automotive sensor information and serves the various services. In this paper, we consider a road surface freezing information providing system and define requests for communication by the system, and implement the road-to-vehicle and vehicle-to-vehicle communication using CoMoSE platform.