Research - Yusuke Sakumoto's Homepage

Table of Contents

1 Computer Network

1.1 Designing Autonomous Decentralized Mechanism of Resource Allocation in large-scale and wide area networks

  • Large-scale and wide-area networks are constituted by numerous nodes widely distributed in the world.
It is hard to gather information from the whole area of such a network.
Hence, each node should autonomously works using the information of its surrounding area.
  • We have proposed the autonomous decentralized mechanism (ADM) to indirectly control a system variable in the following paper.
    • System variable is defined by a control objective (e.g., traffic reduction and load balancing).
    • The autonomous action of nodes is designed by MCMC (Markov Chain Monte Carlo)
Yusuke Sakumoto, Masaki Aida, and Hideyuki Shimonishi, ``Autonomous Decentralized Control for Indirectly Controlling System Performance Variable of Large-Scale and Wide-Area Networks,"
IEICE Transactions on Communications, Vol. E98-B, No.11, pp. 2248-2258, Nov. 2015.
  • We applied the proposed ADM to solve virtual machine (VM) placement problem in DCNs (Data Center Networks)
    • What is the VM placement problem?
      • According to a control objective, VMs are placed among PMs in a DCN.
    • We consider the following two control objectives to design a placement controller based on the proposed ADM.
      • 1) traffic reduction in a DCN, 2) load balancing among PMs
      • The both objectives has a trade-off
    • In the placement controller, each VM autonomously moves to a suitable physical machine (PM) in a DCN.
We should appropriately adjust the control strengths of the both objectives.


1.2 Evaluating Performance of the Thorup’s Shortest Path Algorithm

1.3 Analyzing and Improving eXplicit Congestion Control (XCP)

2 Electricity Grid

2.1 Autonomous Decentralized Mechanism of Energy Interchange in Community Microgrid

  • Renewable energy (e.g., sunlight and wind)
    • Clean and inexhaustible
    • The amount depends on geographical condition and time of day
Renewable energy is expected to be alternative power resource of conventional fuels.
However, it is difficult to supply energy appropriately for energy demand.
  • Community microgrid
    • An electricity system connected AESs(Autonomous Electricity Subsystems) in a community
      • AES (e.g., home)
        • Has generators, batteries, and electric loads.
        • Can interchange energy in its own battery to an adjacent AES.
    • To realize supply energy appropriately for energy demand
      • Excess energy should be transmitted to an AES with high energy demand


We have proposed an autonomous decentralized mechanism of energy
interchange to realize such an energy transmission in the following paper.
Yusuke Sakumoto and Ittetsu Taniguchi, ``Autonomous Decentralized Mechanism for Energy Interchanges with Accelerated Diffusion Based on MCMC,"
IEICE Transactions on Fundamentals of Electronics Communications and Computer Sciences, Vol. E98-A, No.7, pp. 1504-1511, Jul. 2015.

3 Social Network

3.1 Modeling People Interaction and Analyzing its Macroscopic Behavior

Author: Yusuke Sakumoto

Created: 2018-12-04 火 12:39