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 Conference Papers (Available on Advance Programs)  (Sort by: Date Descending)
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Committee Date Time Place Paper Title / Authors Abstract Paper #
IT 2023-08-03
Kanagawa Shonan Institute of Technology
(Primary: On-site, Secondary: Online)
An Asymmetric Encoding-Decoding Scheme for Lossless Data Compression
Hirosuke Yamamoto (Univ. of Tokyo), Ken-ichi Iwata (Univ. of Fukui) IT2023-17
ANS (Asymmetric Numeral Systems) are new lossless data-compression-coding systems that can achieve almost the same compr... [more] IT2023-17
RCC, ISEC, IT, WBS 2023-03-14
(Primary: On-site, Secondary: Online)
A Construction Method of Alphabetic Codes Allowing N-bit Decoding Delays
Daichi Ueda, Ken-ichi Iwata (Univ. of Fukui), Hirosuke Yamamoto (The Univ. of Tokyo) IT2022-102 ISEC2022-81 WBS2022-99 RCC2022-99
As an extension of the AIFV and AIFV-m codes that allow decoding delay, Sugiura, Kamamoto, and Moriya proposed the N-bit... [more] IT2022-102 ISEC2022-81 WBS2022-99 RCC2022-99
IT, ISEC, RCC, WBS 2022-03-10
Online Online [Special Invited Talk] A spread of Information Theory Researches
Hirosuke Yamamoto (U.Tokyo) IT2021-103 ISEC2021-68 WBS2021-71 RCC2021-78
We look back on the research themes dealt with in our researches of information theory for 47 years, and think about the... [more] IT2021-103 ISEC2021-68 WBS2021-71 RCC2021-78
SIP, IT, RCS 2021-01-21
Online Online A counterexample to the conjecture that the maximum redundancy of the AIFV-m codes is 1/m and an improvement
Yuta Nakamura, Ueda Daichi, Ken-ichi Iwata (Univ. of Fukui), Hirosuke Yamamoto (The Univ. of Tokyo) IT2020-73 SIP2020-51 RCS2020-164
Hu, Yamamoto, and Honda proposed the binary AIFV-m codes and proved that the redundancy of the optimal binary AIFV-m cod... [more] IT2020-73 SIP2020-51 RCS2020-164
IT 2020-12-02
Online Online Enumeration and Coding of Binary AIFV-m Code Trees
Genta Onishi, Kengo Hashimoto, Ken-ichi Iwata (Univ. of Fukui), Hirosuke Yamamoto (The Univ. of Tokyo) IT2020-33
Using the one-to-one correspondence between binary AIFV codes and Schröder paths, Sumigawa and Yamamoto gave a method to... [more] IT2020-33
PN 2020-04-24
Online Online [Invited Talk] AIFV Code Construction Method and Optimization Method for Average Performance of Markov Chains with Finite States
Ken-ichi Iwata, Ryusei Fujita (Univ. of Fukui), Hirosuke Yamamoto (Univ. of Tokyo) PN2020-3
We describe a construction method to design the optimal binary AIFV codes, which are defined by Yamamoto, Tsuchihashi, H... [more] PN2020-3
IT, SIP, RCS 2020-01-23
Hiroshima Hiroshima City Youth Center On a redundancy of AIFV-m codes -- for m=3,5 --
Ryusei Fujita, Ken-ichi Iwata (Univ. of Fukui), Hirosuke Yamamoto (Univ. of Tokyo) IT2019-48 SIP2019-61 RCS2019-278
(To be available after the conference date) [more] IT2019-48 SIP2019-61 RCS2019-278
RCS, SIP, IT 2019-02-01
Osaka Osaka University Iterative Optimization Algorithm for Average Performance of Finite State Markov Chain
Ryusei Fujita, Ken-ichi Iwata (Univ. of Fukui), Hirosuke Yamamoto (Meiji Univ.) IT2018-61 SIP2018-91 RCS2018-268
(To be available after the conference date) [more] IT2018-61 SIP2018-91 RCS2018-268
RCS, SIP, IT 2019-02-01
Osaka Osaka University A Construction Method of the Optimal Code Trees for Binary Alphabetic AIFV Codes
Yuya Nakanishi, Ryusei Fujita, Ken-ichi Iwata (Univ. of Fukui), Hirosuke Yamamoto (Meiji Univ.) IT2018-62 SIP2018-92 RCS2018-269
(To be available after the conference date) [more] IT2018-62 SIP2018-92 RCS2018-269
IT 2018-07-19
Nara Yamato Kaigishitsu Easy Construction of Binary AIFV Codes for Unequal Letter Costs
Takahiro Yoshida (The Univ. Tokyo), Hirosuke Yamamoto (Meiji Univ.) IT2018-18
In the case that the costs of letters (code symbols) 0 and 1 are equal, it is known that the AIFV code with two code tre... [more] IT2018-18
WBS, IT, ISEC 2018-03-08
Tokyo Katsusika Campas, Tokyo University of Science Optimality for the Iterative Construction Scheme of AIFV-$m$ codes
Ryusei Fujita, Ken-ichi Iwata (Univ. of Fukui), Hirosuke Yamamoto (The Univ. of Tokyo) IT2017-111 ISEC2017-99 WBS2017-92
Yamamoto, Tsuchihashi, and Honda proposed binary AIFV (almost instantaneous fixed-to-variable length) codes, which allow... [more] IT2017-111 ISEC2017-99 WBS2017-92
IT 2017-11-28
Niigata Hotel Shiratama-no-Yu Senkei [Invited Talk] AIFV Codes and Their Extended Codes
Hirosuke Yamamoto (Univ. of Tokyo) IT2017-54
In source coding based on a code tree, it was concluded from Kraft's and McMilan's theorems that
the Huffman code is t... [more]
IT 2017-09-08
Yamaguchi Centcore Yamaguchi Hotel Dynamic AIFV coding using a dynamic Huffman code
Tomotaka Hiraoka, Hirosuke Yamamoto (The Univ. of Tokyo) IT2017-46
Since AIFV codes attain better compression rate than Huffman codes, dynamic AIFV codes are expected to attain better com... [more] IT2017-46
EMM, IT 2017-05-23
Yamagata Yamagata University(Yonezawa Campus) A Dynamic Programming Algorithm to Construct Optimal Code Trees of Binary AIFV-m Codes
Takaya Kawai, Ken-ichi Iwata (Univ. of Fukui), Hirosuke Yamamoto (The Univ. of Tokyo) IT2017-14 EMM2017-14
Yamamoto, Tsuchihashi, and Honda proposed binary almost instantaneous fixed-to-variable length (AIFV) codes, which allow... [more] IT2017-14 EMM2017-14
IT, EMM 2016-05-20
Hokkaido Otaru Economic Center Optimization for the average performance of five-state system with probabilistic transition
Ken-ichi Iwata, Takato Kimura (Univ. of Fukui), Hirosuke Yamamoto (The Univ. of Tokyo) IT2016-18 EMM2016-18
We consider an optimization problem for the average performance of a probabilistic transition system with n states. Supp... [more] IT2016-18 EMM2016-18
IT 2015-09-04
Ishikawa Hakusan Shobutei optimization for the average performance of three-state system with probabilistic transition
Takato Kimura, Ken-ichi Iwata (Univ. of Fukui), Hirosuke Yamamoto (The Univ. of Tokyo) IT2015-42
For a three-state system with probabilistic transition, we consider an optimization problem for the average performance ... [more] IT2015-42
ISEC, IT, WBS 2015-03-02
Fukuoka The University of Kitakyushu (k,n)-Threshold Secret Sharing Schemes to Detect Substitution Attacks
Wataru Nakamura, Hirosuke Yamamoto (UTokyo) IT2014-79 ISEC2014-92 WBS2014-71
This paper treats $(k,n)$-threshold secret sharing schemes to detect substitution attacks. First a symbolwise coding sch... [more] IT2014-79 ISEC2014-92 WBS2014-71
IT 2015-01-30
Chiba   Optimality Proof for the Iterative Construction Scheme of AIFV codes
Hirosuke Yamamoto (UTokyo) IT2014-57
 [more] IT2014-57
IT 2014-07-17
Hyogo Kobe University Construction of Almost Instantaneous FV codes based on Integer Programming
Masato Tsuchihasi, Hirosuke Yamamoto, Junya Honda (Univ. of Tokyo) IT2014-11
The Almost Instantaneous FV (AIFV) code, which consists of
several code trees with incomplete internal nodes, can atta... [more]
IT 2014-07-17
Hyogo Kobe University Extended LZW codes with Modified Reduplicative Parsing
Yuta Takabayashi, Hirosuke Yamamoto (Univ. of Tokyo) IT2014-19
The LZW code is categorized as the so-called dictionary method in the universal data compression codes and is used in G... [more] IT2014-19
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