University of Electro-Communications

About: University of Electro-Communications is a education organization based out in Tokyo, Japan. It is known for research contribution in the topics: Laser & Robot. The organization has 8041 authors who have published 16950 publications receiving 235832 citations. The organization is also known as: UEC & Denki-Tsūshin Daigaku.

An overview of the tokyo electron beam ion trap

Abstract: A new Electron Beam Ion Trap has recently been completed in Tokyo. The general features of the apparatus, design and operation are given. This paper also surveys the planned and ongoing experimental program.

Magnetic Domain Wall Oscillator

Abstract: We show that the rotation of a magnetic domain wall (DW) can be induced by the injection of a dc current into a magnetic wire with a DW. A novel three-terminal device that produces microwaves by utilizing the current-induced DW rotation is proposed. The frequency of the microwaves can be tuned by adjusting the current density through the wire, and the amplitude of the microwaves can be regulated through a dc bias applied to the magnetic tunnel junction.

Toward Practical and Intelligent Routing in Vehicular Ad Hoc Networks

Abstract: Apart from vehicle mobility, data rate (bit rate) and multihop data transmission efficiency (including route length) have a significant impact on the performance of a routing protocol for vehicular ad hoc networks (VANETs). Existing routing protocols do not seriously address all these issues and are not evaluated for a real VANET environment. Therefore, it is difficult for these protocols to attain a high performance and to work properly under various scenarios. In this paper, we first discuss the challenges of routing in VANETs based on the data acquired from real-world experiments and then propose a routing protocol that is able to learn the best transmission parameters by interacting with the environment. The protocol takes into account multiple metrics, specifically data transmission rate, vehicle movement, and route length. We use both real-world experiments and computer simulations to evaluate the proposed protocol.

FIBER: A Generalized Framework for Auto-tuning Software

Abstract: This paper proposes a new software architecture framework, named FIBER, to generalize auto-tuning facilities and obtain highly accurate estimated parameters. The FIBER framework also provides a loop unrolling function, needing code generation and parameter registration processes, to support code development by library developers. FIBER has three kinds of parameter optimization layers–installation, before execution-invocation, and run-time. An eigensolver parameter to apply the FIBER framework is described and evaluated in three kinds of parallel computers; the HITACHI SR8000/MPP, Fujitsu VPP800/63, and Pentium4 PC cluster. Evaluation indicated a 28.7% speed increase in the computation kernel of the eigensolver with application of the new optimization layer of before execution-invocation.