Hiroyuki Osaki

Major research activity

Our primary research objective is realization of an extremely large-scale and advanced information system, which we call "Information Ecosystem". Information Ecosystem is composed of several heterogeneous and large-scale networks including the Internet, mobile networks, wireless sensor networks, and social networks.

The current Internet was initially designed in 1970's. A great number of enhancements have been added to its networking protocol called TCP/IP protocol. Due to many inherent architectural limitations and compatibility issues, it is now almost impossible to implement innovative features to the Internet. It is the time to redesign the current Internet.

Also, the Internet is composed of millions of nodes and used by billions of users. It has been still continuously expanding. The Internet is apparently the largest artificial system in the history of human being. Unfortunately, there is little theory to understand, design, and control such a large-scale information system. Conventional networking researches have therefore being relying on adhoc and heuristic approaches.

We therefore develop fundamental theories for design, modeling, and control of large-scale information ecosystems, and also present practical solutions to challenging issues in the real world. Examples of our research topics are information-centric network architecture, in which data transferred in the network is the first-class, epidemic-style communication in challenging environments, real-time communication protocols for automation and plant control, network services for online communities. Through development of fundamental theories and realization of practical solutions, we will create the future of advanced networked society.


- Large-Scale Network
- Complex Network
- Network Dynamics
- Cloud Networking
- Network Virtualization
- Social Networking
- Network Modeling
- Traffic Management
- Performance Evaluation
- Control Theory
- Network Service
- Information Diffusion
- Data-Centric Networking

Major relevant publications

  1. K. Tsutsumi, H. Suzuki, and H. Ohsaki, "A distributed flow control with backward propagation," in Proceedings of the IEEE Signature Conference on Computers, Software, and Applications (COMPSAC 2015), pp. 355-360, July 2015.
  2. S. Tsugawa and H. Ohsaki, "Community structure and interaction locality in social networks," Journal of Information Processing (to appear, invited paper), 2015.
  3. T. Ito, H. Ohsaki, and M. Imase, "GridFTP-APT: Automatic parallelism tuning mechanism for GridFTP in long-fat networks," IEICE Transactions on Communications, vol. E91-B, pp. 3925-3936, Dec. 2008.
  4. H. Ohsaki and M. Murata, "Steady state analysis of the RED gateway: stability, transient behavior, and parameter setting," IEICE Transactions on Communications, vol. E85-B, pp. 107-115, Jan. 2002.
  5. H. Ohsaki, N. Wakamiya, M. Murata, and H. Miyahara, "Performance of an input/output buffered-type ATM LAN switch with back-pressure function," IEEE/ACM Transactions on Networking, vol. 5, pp. 278-290, Apr. 1997.

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