Koichi Homma

Geometric correction algorithms for satellite imagery using a bi-directional scanning sensor

High-precision geometric correction algorithms for a bidirectionally scanned image that are based on separate geometric models according to the distortion characteristics are described. The modeling accuracy is evaluated through the use of simulated and observed Landsat Thematic Mapper (TM) images. TM images include a discontinuous distortion and a high-frequency distortion due to attitude fluctuations and bidirectional scans. A geometric model consisting of a single-valued-function is used to correct these distortions. The iteration calculation of the mapping cannot be converged, resulting in an enormous amount of calculation and data. Therefore, geometric models consisting of separate geometric models of the bidirectional scans and frequency components are proposed. >

Systems technologies for the ubiquitous society

As a trans-disciplinary approach to integrate a multi-disciplinary project (Yaoyorozu Project), we propose a concept of combination of systems technologies, that is, mathematical modeling of society, multi-agent simulation, and a scenario generation method. The objectives of the project are to design ubiquitous information society of 2010 and to extract issues of the future information society. This paper reports some research results of these systems technologies; a mathematical model relevant to the spreading of the ubiquitous information systems which consists of mobile/wearable devices and devices in environments, a social simulation focused on ubiquitous community sustainability, and a scenario-generating procedure for extracting future social issues. The synergetic relationship among these three technologies is also discussed.

Socio-technical issues for ubiquitous information society in 2010

The impact of ubiquitous information technology on society has been so powerful that it has generated an urgent and immediate need for directing technological development and preparing institutional apparatus. This paper endeavors to identify and predict the socio-technical issues that face the ubiquitous information society by 2010, by investigating the social implications of emerging technology, as well as social expectations. To study the issues, we developed scenarios that describe hypothetical situations in the ubiquitous information society. The derived issues cover integrating information technology and human body, producing smart sharable environments, protecting individual rights, fostering new service businesses, and forming self-evolving communities.

The Yaoyorozu project designing ubiquitous information society in 2010

The Yaoyorozu project has been conducted in order to design ubiquitous information society in 2010. This design problem calls for collaboration of humanity and engineering sciences. In order to foster collaboration among researchers in diversified disciplines, development of scenarios is emphasized that facilitates communications and discussions among the participants. The present paper describes background and the research organization as well as summary of the research accomplishments so far.

Designing the ubiquitous information society based on an approach of trans-disciplinary science and technology

We in the systems sub-theme in the Yaoyorozu project is working to develop methodologies mainly based on computer models integrating multiple disciplinary knowledge for designing a ubiquitous information society. Scenario models for possible future quadrants are developed for fostering socio-economic discussions and in-depth understandings among other teams with respective disciplines. A multi-agent simulation model and a trust transition model are also developed for deductive evaluation of human behavior triggered by ubiquitous information services. This paper summarizes the future scenarios and related technologies that we are developing.

Socio-technical implications of the ubiquitous information systems

The advances of ingredients in the ubiquitous computing definitely call for socio-technical study directing and preparing technological developments as well as institutional apparatus. This discussion paper reviews socio-technical studies based on scenario development conducted so far and emphasizes the importance of human centric view for the technological and institutional development towards the desirable ubiquitous information society.