Faculty Profiles - SHIMADA Hajime

Papers - SHIMADA Hajime

Division display 21 - 26 of about 26 ／ All the affair displays >>

A Countermeasure Support System against Incidents caused by Targeted Attacks Reviewed

Hirokazu Hasegawa, Yukiko Yamaguchi, Hajime Shimada, Hiroki Takakura

Vol. 57 ( 3 ) page： 1-13 2016.3

Language：Japanese Publishing type：Research paper (scientific journal)

Recently, with rapid increase of targeted attacks, serious damages have been caused. In addition
to the conventional countermeasures which prevent from the intrusion of malwares, another new methods
have attracted much attention to reducing the damage caused by the infection. It is considered that proper
segmentation on an enterprise network and access control among the segments are one of the most effective
countermeasures. The activity of malwares can be suppressed, by prohibiting unnecessary communication
in the network. The record of the communication like the violation of the access control helps us to detect
malwares. From these benefits, we can easily take an action, e.g., the isolation of infected hosts. However,
it should be anticipated that the action judged only by a network administrator may affect on enterprise's
business. In this paper, we propose a countermeasure support system which enables swift and proper action
against the incident. The system generates 9 candidates of the access control. By evaluating the candidates
based on the effectiveness against malicious activities and the impact on business, the most suitable countermeasure
is recommended to a network administrator. Therefore, he/she can take feasible action with swift
and proper response.

英文論文誌小特集号「Special Section on Low-Power and High-Speed Chips」発刊によせて Invited

嶋田創

電子情報通信学会エレクトロニクスソサエティ NEWS LETTER Vol. 161 page： 19 2015.7

Language：Japanese

電池駆動される情報機器の爆発的な普及により、そのような機器に用いられる半導体回路やそれを用いて実現したプロセッサの消費電力削減は、引き続き、重要な課題となっています。また、近年では化石燃料消費による二酸化炭素排出の削減のため、サーバ用プロセッサにおいても電力効率の向上は重要な課題となっている。この分野の研究を論文として発表する場として、このたび、英文論文誌小特集号「Special Section on Low-Power and High-Speed Chips」を発刊することになり、厳正な編集・査読作業の結果、本特集号には6編の一般論文、1編のショートノートが採録されることとなった。

BTB Energy Reduction by Focusing on Useless Accesses Reviewed

Y. Shimomura, H. Yamamoto, H. Usui, R. Kobayashi, and H. Shimada

IEICE Transactions on Electronics Vol. E98-C ( 7 ) page： 569-579 2015.7

Language：English Publishing type：Research paper (scientific journal)

Modern processors use Branch Target Buffer (BTB) to relax control
dependences. Unfortunately, the energy consumption of the BTB is
high. In order to effectively fetch instructions, it is necessary to perform a
branch prediction at the fetch stage, regardless of whether the fetched instruction
is a branch or a nonbranch. Therefore, the number of accesses to
the BTB is large, and the energy consumption of the BTB is high. However,
accesses from nonbranches to the BTB waste energy.
In this paper, we focus on accesses from nonbranches to the BTB,
which we call useless accesses from a viewpoint of power. For reducing
energy consumption without performance loss, we present a method
that reduces useless accesses by using information that indicates whether a
fetched instruction is a branch or not. To realize the above approach, we
propose a branch bit called B-Bit. A B-Bit is associated with an instruction
and indicates whether it is a branch or not. A B-Bit is available at the beginning
of the fetch stage. If a B-Bit is "1" signifying a branch, the BTB is
accessed. If a B-Bit is "0" signifying a nonbranch, the BTB is not accessed.
The experimental results show that the number of accesses to the BTB can
be reduced by 70.7% and the total energy consumption can be reduced by
61.4% without performance loss.

Reliability-Configurable Mixed-Grained Reconfigurable Array Supporting C-Based Design and Its Irradiation Testing Reviewed

H. Konoura, D. Alnajjar, Y. Mitsuyama, H. Shimada, K. Kobayashi, H. Kanbara, H. Ochi, T. Imagawa, K. Wakabayashi, M. Hashimoto, T. Onoye, and H. Onodera

IEICE Trans. on Fundamentals of Electronics, Communications and Computer Sciences Vol. E97-A ( 12 ) page： 2518-2529 2014.12

一時/永久故障に自動再構成で対応する高信頼プロセッサ Invited Reviewed

嶋田創, 姚駿

日本信頼性学会誌「信頼性」 Vol. 35 ( 8 ) page： 459 2013.12

Reducing Cache Hardware by Focusing on Data Redundancy Reviewed

Ryotaro Kobayashi, Daisuke Matsukawa, Yoshio Shimomura, Hiroya Ochiai, Hajime Shimada

Vol. 133 ( 8 ) page： 1597-1606 2013.8

　 PREV - NEXT 　

<SHIMADA Hajime>

Papers - SHIMADA Hajime