Researcher List

Department of Information Networks

Network protocols and wireless network architecture

Network protocols and wireless network architecture

At the Communication Systems Laboratory, we study the communication system protocols that are crucial for person-to-person interactions. The past few years have seen a rapid spread of wireless communication systems, but their characteristics and constraints differ significantly from those of conventional wired networks, and so it is essential to design protocols that appropriately match their aspects. Thus, the focus of our research is on network architecture in the data link layer and higher, comparing wired and wireless architectures.

One area of our current research is concerned with the development of a highly reliable multicast method for wireless networks. A wireless system can send the same data to a large number of recipients, but frequent errors may result in reduced reliability. Therefore, we are working on a method that combines high reliability with simultaneous broadcasting, and producing a prototype of such a system.

Application of information security infrastructure

Application of information security infrastructure
Application of information security infrastructure

The Internet provides many advantages to people, but has also enabled communication threats such as tapping, forgery, spoofing, and censorship. At the Department of Information Networks, we are working on the development of systems for certificate authorities, attribute authorities, key management, and other infrastructures that we hope will be able to neutralize such threats. We are also investigating ways to ensure secure applications comprised of web servers, IC cards, and other components that use such systems.

Developing robots for the Real World Robot Challenge (RWRC)
Toward the realization of future robots that support humans

Official route of RWRC2010
Official route of RWRC2010
Developed vehicle
Developed vehicle

Extended image

  • The Real World Robot Challenge (RWRC) is a technology competition for autonomous robots (capable of thinking and acting on their own) wherein various research institutions and universities compete with the goal of developing robots that "function both safely and reliably" in the environments that people actually live in.
  • The robots calculate their present position based on GPS data and measurements of distance traveled, and move along a route designated on a digital map. Teachers and students work together on the development of the diverse sensor technologies required for the robot to navigate various outdoor terrains, such as sidewalk sand parks, ride elevators, and detect its own position indoors. Laser range sensors and other three-dimensional measurement technologies are also used.

Travel route GPS data

Research on design, construction, and operational management methods for computer networks

Research on design, construction, and operational management methods for computer networks

We are working on the development of technology for the stable operation of computer networks and network-based application systems, e.g., methods for an organization's internal and external communication that is free from information leakage, methods for quickly detecting network failures and rectifying them, and methods for setting network equipment automatically. We are also training developers of systems that actually function (i.e., can be of practical use).

Education support systems

Education support systems
Education support systems

In a large classroom for PC classes, it is difficult to monitor the progress of individual students. We hope to offer a solution to this problem by developing a web application for tracking students' achievements. The proposed functions include:

  • monitoring the class on a classroom layout screen
  • monitoring the progress of individual students
  • reproducing progress conditions

The web application is optimized for mobile terminals such as the iPad, so that teaching assistants (TAs)can use them as they walk around the classroom. It is expected that using this tool will reduce the number of drop-outs and enhance pedagogical effects.

Communication support based on media information processing technology

Communication support based on media information processing technology
Communication support based on media information processing technology

Our goal is to create an environment which allows natural communication between people over long distances, and between people and computers. To achieve this, we are conducting research on a remote dialogue system which gives the feeling of actually being in the same room as the distant entity, by accurately transmitting data on human gestures and emotions to a remote place or computer. These data are calculated using computer vision technology and sound processing technology based on visual, audio, and other data acquired by cameras, microphones, and other sensors. We are also working on a computer interface that enables more natural interactions.