In this paper, we address a restoration problem for graph signals with unknown signal values. First, we introduce an autoregressive model for graph signals. We next develop a restoration method based on a rank minimization technique. The proposed method is demonstrated by applying to a PageRank estimation problem of a web network.

In this paper, we discuss the smart parking system in urban traffic network. In recent years, the decline in vehicle speed when searching for parking lots has been caused traffic jam in urban traffic network. Then, in this paper, we aim at shortening the searching time for parking lots, which is one of the causes of traffic jam, by allocating parking lots being available to drivers. Furthermore, we design the dynamical parking fee and redistribute parking lots to level the multiple parking manager's profit in traffic area. Finally, we confirm the effectiveness of proposed algorithm in numerical simulation.

This paper proposes a new approach for the stability analysis and controller synthesis of sampled-data uncertain systems with time-varying delay in the input. In our previous works, we have already derived a stability criterion for sampled-data linear systems with bounded uncertain time-varying delay shorter than one sampling period and proposed a design method of static state feedback for such systems. This paper attempts to derive the extensions for systems with parameter uncertainties from the viewpoint of robust stability. The validity and usefulness of the obtained results are evaluated by numerical examples, including stabilization of a cart-inverted pendulum system.

A home energy management system (HEMS) utilizing an electric vehicles (EV) is expected to realize both highly efficient energy management and cost saving of implementing batteries into the home. Also, the HEMS has a potential to contribute in the regional energy management. This paper proposes a method for homes which equip the HEMS, an EV, and a PV generator, to participate in a regulation service market that is a social system for the sake of stabilizing the quality of regional electricity by trading electric capacity. Each HEMS calculates the electric energy (bidding capacity) to supply for the regulation service based on minimizing the electricity fee with considering the future usage of the EV, the future power profiles of consumption and generation, and the expected remuneration from the market. In addition, a method for each home to track the electric power signal sent from the market every two seconds is proposed. The method can realize a real-time tracking control based on a decentralized optimization method called a dual decomposition one. A simulation result based on data of realistic conditions shows that the proposed method can give economical benefit to the residents who participate in the market.

Two-wheeled quadrotor helicopter is a quadrotor helicopter with two independent wheels, and can not only fly in the air but also move on the ground and the ceiling. This paper considers the problem of controlling both the position and the attitude of the two-wheeled quadrotor helicopter on the ground and the ceiling. First, a new and practical tracking control system based on a flight controller is proposed. The control system makes it easy to design tracking controllers for the position and the yaw angle. The design problem is reduced to a usual state-feedback controller problem, and the design method is simple and straightforward by using well-known linear control theory, for example, LQR method. The effectiveness is demonstrated by some simulations and flight experiments moving on the ground and the ceiling.