通信情報システム専攻 2013年度談話会の概要
第1回(※英語開催)
- 日時
- 2013年4月26日(金) 16:30-18:00
- 場所
-
※YRPで聴講される場合は世話人まで事前にご連絡ください。
- 講演者
- Dr. Gopi Krishna Seemala, Researcher
Research Institute for Sustainable Humanosphere (RISH), Kyoto University
- 講演題目
- GPS and Ionospheric studies
- 概要
-
This presentation will be a semi popular talk. The presentation gives
some basic information about the Global Positioning System (GPS), a
satellite based navigation system. How the GPS provides location
information to the user anywhere on earth and then the current advances
in navigation, their uses and the need. Then, the presentation will
describe the role of GPS receivers in ionospheric research and the
current research of the author in this field at RISH, Kyoto University.
第2回(※日本語開催)
- 日時
- 2013年5月17日(金) 16:30-18:00
- 場所
-
※YRPで聴講される場合は世話人まで事前にご連絡ください。
- 講演者
- 高瀬 英希 (高木研究室・助教)
- 講演題目
- 組込みシステムの消費エネルギー最適化のための基盤ソフトウェア技術
- 概要
- 組込みシステムとは，産業機器や家電製品に内蔵され，特定の機能を
実現するコンピュータシステムのことを指す．近年の我々の生活は，
ありとあらゆるところに存在する組込みシステムによって支えられて
いるといっても過言ではない．組込みシステムでは，消費エネルギーの
最適化が非常に重要な課題となっている．
本講演では，組込みシステムの消費エネルギー最適化を実現する基盤
ソフトウェア技術について解説する．具体的には，アクセス頻度の高い
データを省電力なメモリに集中配置するコンパイラ技術，プログラムの
振る舞いを実行時ログから解析するプロファイラ技術，ハードウェア
構成をスケジューリングするOS技術である．さらに，これらの基盤ソフト
ウェア技術を統合的に適用する消費エネルギー協調最適化フレームワークに
ついて紹介する．
第3回(※英語開催)
- 日時
- 2013年6月21日(金) 16:30-18:00
- 場所
-
※YRPで聴講される場合は世話人まで事前にご連絡ください。
- 講演者
- Dr. Riichi Kudo, NTT Network Innovation Laboratories
- 講演題目
- Unitary matrix Utilization Methods for Wireless Multiple
Input Multiple Output Systems.
- 概要
-
The demand for higher data rate wireless communication has
increased as wireless communication market has grown. Multiple input
multiple output (MIMO) techniques are promising to increase throughput
within a limited frequency band. The number of antennas in practical
systems is increasing and it is expected that this increase will
continue to satisfy the demand of high-speed transmission. When a
transmitter has large amount of transmit antennas, precoding techniques
using channel state information (CSI) between a transmitter and receiver
increases the throughput. As CSI at the transmitter, the unitary matrix
corresponding to signal space, which can be defined as eigenvectors or
right singular vectors, is important. This talk presents unitary matrix
utilization methods for wireless communication systems. The unitary
matrices can be used for precoding techniques and channel estimation
methods. Computer simulations show the effectiveness of the unitary
matrix utilization methods.
第4回(※英語開催)
- 日時
- 2013年7月19日(金) 16:30-18:00
- 場所
-
※YRPで聴講される場合は世話人まで事前にご連絡ください。
- 講演者
- Dr. Tetsuo Asano, Professor, School of Information Science, JAIST
- 講演題目
- Designing Algorithms with Limited Work Space
- 概要
-
Recent progress in computer systems has provided programmers with
virtually unlimited amount of work storage for their programs. This
leads to space-inefficient programs that use too much storage and become
too slow if sufficiently large memory is not available. Thus, I believe
that space-efficient algorithms or memory-constrained algorithms deserve
more attention. Constant-work-space algorithms have been extensively
studied under a different name, log-space algorithms. Input data are
given on a read-only array of $n$ elements, each having O(log n) bits,
and work space is limited to O(log n) bits, in other words, a constant
number of pointers and counters, each of O(log n) bits. This memory
constraint in the log-space algorithms may be too severe for practice
applications. For problems related to an image with n pixels, for
example, it is quite reasonable to use work space of the order of
square root of n, which amounts to a constant number of rows and columns.
I will start my talk with a simple problem in this framework. Then, I
will introduce some paradigms for designing such memory-constrained
algorithms and their applications to interesting problems including
those in computational geometry and computer vision.
第5回(※英語開催)
- 日時
- 2013年10月18日(金) 16:30-18:00
- 場所
-
※YRPで聴講される場合は世話人まで事前にご連絡ください。
- 講演者
- Dr. Kyungsoo LEE, Postdoc, Kyoto university
- 講演題目
- Management techniques for the energy harvesting embedded system
- 概要
-
Energy-harvesting devices are materials that allow ambient energy
sources to be converters into usable electrical power. While a battery
powers the modern embedded systems, these energy-harvesting devices
power the energy-harvesting embedded systems. This claims a new energy
efficient management techniques for the energy-harvesting systems
dislike the previous management techniques.
In this talk, we will review the current management techniques for the
energy harvesting embedded system.
第6回
- 日時
- 2013年11月15日(金) 16:30-18:00
- 場所
-
※YRPで聴講される場合は世話人まで事前にご連絡ください。
- 講演者
- 村山 泰啓(京都大学生存圏研究所・客員教授, 独立行政法人情報通信研究機構・統合データシステム研究開発室室長)
- 講演題目
- 科学データ国際事業「ICSU-WDS (World Data System）」をめぐる科学とデータと社会の関わり
- A new international data activity ICSU-World Data System (WDS), and its perspective with science, data, and society
- 概要
-
近年、ビッグデータ等がしばしば騒がれるなか、科学の基盤としてデータの意味
が見直されつつある。科学と社会との信頼関係を維持するうえで、オープンな証
拠の提示と合理的議論は不可欠である。実験室で再確認できない現象、地球環境
などの自然現象においてはとくに、科学的発見の証拠・根拠として、論文および
オープンなデータが必要であるという国際的な議論が行われている。しかし科学
情報の共有手段として、印刷物と比べれば電子メディアの歴史は浅い。2008年、
ICSU（国際科学会議；International Council for Science。1931年発足）は過
去50年以上の蓄積をもとに新たな組織World Data System（WDS）を発足して、長
期的なデータ保全活動等や自然科学・人文社会科学まで分野の偏らない新たなデー
タ相互利用システム・流通体制の実現を目指した活動をすすめている。
-
With a growing interest in data explosion and advancing information
technology, the meaning of "data" as the infrastructure of science is
being changed. In the international community open sharing of data as
well as open access of scholarly research papers are being discussed as
crucial components of science. These are important for maintaining trust
of science in society, especially for researches of phenomena
irreproducible in an laboratory experiment such as the global
environment and huge tsunamis for example. ICSU (International Council
for Science) has reformed data-related organizations with their >50-year
legacy to start a new body ICSU-World Data System (WDS) in 2008. WDS’s
objectives includes long-term preservation of scientific data, and
interoperable distributed data exchanges on a multidisciplinary basis
including social sciences and humanities
第7回(※英語開催)
- 日時
- 2013年12月20日(金) 16:30-18:00
- 場所
-
※YRPで聴講される場合は世話人まで事前にご連絡ください。
- 講演者
- Prof. Kohei Suenaga, Associate professor, Kyoto University
- 講演題目
- Formal verification -- from software to hybrid systems
- 概要
-
We are living in the world that consists of many systems: mechanical
systems, electrical systems, computer systems, and so on. Failure of
such systems may cause damage; it sometimes costs even lives.
Ensuring correctness of a system is an important issue. To this end,
various techniques have been studied and used.
Formal verification is one of such techniques. It ensures the
correctness of a system by mathematically proving the correctness.
Such mathematical proof gives a strong evidence of the correctness.
This talk is intended to be an introduction to formal verification,
especially formal verification for software. Because formal
verification for software deals with mathematically modeled software, I
begin this talk by introducing what it is like to model software
mathematically; then, I will pick up one software
verification technique as an example: Hoare logic, a logic for
reasoning properties of a program.
As an interesting application of software verification, I will also
talk about my recent research topic: application of software
verification to hybrid systems -- systems that exhibit both discrete
behavior and continuous behavior -- by using nonstandard analysis. In
this work, We add a constant "dt" that represents an infinitesimal
(i.e., infinitely small) value to a standard programming language and
Hoare logic. The outcome is a framework for modeling and verification
of hybrid systems. We rigorously define the semantics of programs in
the language of nonstandard analysis, on the basis of which the
program logic is shown to be sound and relatively complete. This is a
joint work with Ichiro Hasuo at the University of Tokyo.
第8回
- 日時
- 2014年1月17日(金) 16:30-18:00
- 場所
-
※YRPで聴講される場合は世話人まで事前にご連絡ください。
- 講演者
- Prof. Takayuki Nishio, Assistant Professor, Graduate school of
Informatics, Kyoto University
- 講演題目
- Heterogeneous Resource Sharing for Mobile Cloud Computing
- 概要
-
The recent uptake of cloud computing platforms and mobile devices is
converging into mobile cloud computing, which is a new paradigm for
mobile applications and services that promises to have a strong impact
on our lives. Fog computing is expected to be an enabler of the mobile
cloud computing, which extends the cloud computing paradigm to the edge
of the network. In the mobile cloud, not only central data centers but
also pervasive mobile devices share their heterogeneous resources (e. g.
CPUs, bandwidth, content) and support services. The mobile cloud based
on such resource sharing is expected to be a powerful platform for
mobile cloud applications and services. In this talk, I will introduce a
frontier of mobile cloud and research issues. I will briefly introduce
an architecture and mathematical frameworks for heterogeneous resource
sharing toward the mobile cloud.