Hiroki Koga

59 papers A* 2A 1B 16C 13Journal 22Unranked 5
YearRankTypeTitle / Venue / Authors
2026 J jnl
An Explicit Construction of a Coded Caching Scheme with Heterogeneous Cache Sizes and Its Extension via Optimization.
IEICE Trans. Fundam. Electron. Commun. Comput. Sci.
Akihito Nagaya, Tomoki Yoneyama, Hiroki Koga
2025 — conf
New Tight Bounds on the Local Leakage Resilience of the Additive (n, n)-Threshold Scheme Determined by the Eigenvalues of Circulant Matrices.
ASIACRYPT (8)
Hiroki Koga, Hiroto Abe
2024 C conf
An Explicit Construction of a Coded Caching Scheme with Heterogeneous Cache Sizes.
ISITA
Akihito Nagaya, Hiroki Koga
2024 C conf
Constructions of a Visual Cryptography Scheme Using an Affine Resolvable BIBD.
ISITA
Naoki Mitarai, Hiroki Koga
2023 J jnl
Foreword.
IEICE Trans. Fundam. Electron. Commun. Comput. Sci.
Hiroki Koga
2022 B conf
Construction of the Visual Cryptography Scheme with the Maximum Relative Difference under a Strong General Access Structure.
ISIT
Hiroki Koga
2022 C conf
On the Optimal Construction of a Visual Cryptography Scheme for Multiple Secret Images.
ISITA
Raiki Ioki, Hiroki Koga
2022 C conf
On the Optimum Achievable Rates of a Coded Caching Scheme with Small Cache Memory.
ISITA
Akihito Nagaya, Hiroki Koga
2021 — conf
Analog In-memory Computing in FeFET-based 1T1R Array for Edge AI Applications.
VLSI Circuits
Daisuke Saito, Toshiyuki Kobayashi, Hiroki Koga, Nicolo Ronchi, Kaustuv Banerjee, Yusuke Shuto, Jun Okuno, Kenta Konishi, Luca Di Piazza, Arindam Mallik, Jan Van Houdt, Masanori Tsukamoto, Kazunobu Ohkuri, Taku Umebayashi, Takayuki Ezaki
2021 B conf
Coding Theorems on Digital Fingerprinting Coding under Informed and Uninformed Setups.
ITW
Hiroki Koga
2021 J jnl
Optimal Basis Matrices of a Visual Cryptography Scheme with Meaningful Shares and Analysis of Its Security.
IEICE Trans. Fundam. Electron. Commun. Comput. Sci.
Kyohei Sekine, Hiroki Koga
2020 B conf
An Ideal Secret Sharing Scheme Realizing an Access Structure Based on a Finite Projective Plane of Order 3.
ISIT
Yohei Okawa, Hiroki Koga
2020 C conf
Coding Theorems on the Simple Capacity for Digital Fingerprinting Codes.
ISITA
Hiroki Koga
2020 C conf
New Constructions of an Evolving 2-Threshold Scheme Based on Binary or D-ary Prefix Codes.
ISITA
Ryo Okamura, Hiroki Koga
2020 A* conf
Novel Proximity Sensor for Realizing Tactile Sense in Suction Cups.
ICRA
Sayaka Doi, Hiroki Koga, Tomonori Seki, Yutaro Okuno
2020 C conf
Optimal Basis Matrices of a Visual Cryptography Scheme with Meaningful Shares and Analysis of Its Security.
ISITA
Kyohei Sekine, Hiroki Koga
2018 C conf
A Construction of the (4, n)-Threshold Visual Cryptography Scheme Using a 3-Design.
ISITA
Koutaro Okada, Hiroki Koga
2018 B conf
A Lower Bound on the Joint Capacity of Digital Fingerprinting Codes Using Score Functions Based on Log-Likelihood Ratio.
ISIT
Hiroki Koga
2017 — conf
4.6 A 1/2.3inch 20Mpixel 3-layer stacked CMOS Image Sensor with DRAM.
ISSCC
Tsutomu Haruta, Tsutomu Nakajima, Jun Hashizume, Taku Umebayashi, Hiroshi Takahashi, Kazuo Taniguchi, Masami Kuroda, Hiroshi Sumihiro, Koji Enoki, Takatsugu Yamasaki, Katsuya Ikezawa, Atsushi Kitahara, Masao Zen, Masafumi Oyama, Hiroki Koga, Hidenobu Tsugawa, Tomoharu Ogita, Takashi Nagano, Satoshi Takano, Tetsuo Nomoto
2017 B conf
A construction of the progressive (3, n)-threshold visual cryptography using a BIBD and analysis of its optimality.
ITW
Koutaro Okada, Hiroki Koga
2017 J jnl
Foreword.
IEICE Trans. Fundam. Electron. Commun. Comput. Sci.
Jun Muramatsu, Hiroki Koga
2016 C conf
A Higher Order Analysis of the Joint Capacity of Digital Fingerprinting Codes against the Interleaving Attack.
IH&MMSec
Hiroki Koga, Kaoru Itabashi
2016 C conf
New fundamental properties on a secret-key cryptosystem under guessing secrecy criteria.
ISITA
Shota Kamiya, Hiroki Koga
2015 B conf
On a partition of a finite set and its relationships to encoding tasks and the Rényi entropy.
ISIT
Hiroki Koga
2014 B conf
A secret sharing scheme based on a systematic Reed-Solomon code and analysis of its security for a general class of sources.
ISIT
Hiroki Koga, Shuntaro Honjo
2014 J jnl
Multiple neural mechanisms for coloring words in synesthesia.
NeuroImage
Takemasa Yokoyama, Yasuki Noguchi, Hiroki Koga, Ryosuke Tachibana, Jun Saiki, Ryusuke Kakigi, Shinichi Kita
2014 B conf
On the capacity and the zero-error capacity of k-resilient AND anti-collusion codes.
ITW
Hiroki Koga
2014 — conf
Resolution of resource conflicts in the CCPM framework using a local search method.
IEEM
Hiroki Koga, Hiroyuki Goto, Eishi Chiba
2013 J jnl
A Characterization of Optimal FF Coding Rate Using a New Optimistically Optimal Code.
IEICE Trans. Fundam. Electron. Commun. Comput. Sci.
Mitsuharu Arimura, Hiroki Koga, Ken-ichi Iwata
2013 B conf
Characterization of the smooth Rényi Entropy Using Majorization.
ITW
Hiroki Koga
2013 J jnl
Redundancy-Optimal FF Codes for a General Source and Its Relationships to the Rate-Optimal FF Codes.
IEICE Trans. Fundam. Electron. Commun. Comput. Sci.
Mitsuharu Arimura, Hiroki Koga, Ken-ichi Iwata
2012 J jnl
Coding Theorems for a (2, 2)-Threshold Scheme With Detectability of Impersonation Attacks.
IEEE Trans. Inf. Theory
Mitsugu Iwamoto, Hiroki Koga, Hirosuke Yamamoto
2012 J jnl
On the Achievable Rate Region in the Optimistic Sense for Separate Coding of Two Correlated General Sources.
IEICE Trans. Fundam. Electron. Commun. Comput. Sci.
Hiroki Koga
2012 C conf
On the role of mutual infomation between the shares in a robust (k, n)-threshold scheme.
ISITA
Hiroki Koga, Kazuya Koyano
2011 J jnl
A Digital Fingerprinting Code Based on a Projective Plane and Its Identifiability of All Malicious Users.
IEICE Trans. Fundam. Electron. Commun. Comput. Sci.
Hiroki Koga, Yusuke Minami
2011 J jnl
A general method for construction of (
Des. Codes Cryptogr.
Hiroki Koga, Takeru Ishihara
2011 B conf
Coding theorems on the worst-case redundancy of fixed-length coding for a general source.
ISIT
Hiroki Koga, Mitsuharu Arimura, Ken-ichi Iwata
2011 J jnl
Four Limits in Probability and Their Roles in Source Coding.
IEICE Trans. Fundam. Electron. Commun. Comput. Sci.
Hiroki Koga
2010 B conf
A simple secret sharing scheme using a key and its security against substitution of shares.
ISIT
Hiroki Koga
2010 J jnl
Coding Theorems for Cheating-Detectable Secret Sharing Schemes with Two Shares
CoRR
Mitsugu Iwamoto, Hiroki Koga, Hirosuke Yamamoto
2010 J jnl
Path generator control system and virtual compliance calculator for maxillofacial massage robots.
Int. J. Comput. Assist. Radiol. Surg.
Hiroyuki Ishii, Hiroki Koga, Yuichi Obokawa, Jorge Solis, Atsuo Takanishi, Akitoshi Katsumata
2010 C conf
Two generalizations of a coding theorem for a (2, 2)-threshold scheme with a cheater.
ISITA
Hiroki Koga
2009 B conf
A coding theorem for cheating-detectable (2, 2)-threshold blockwise secret sharing schemes.
ISIT
Mitsugu Iwamoto, Hirosuke Yamamoto, Hiroki Koga
2009 J jnl
Development and Experimental Evaluation of Oral Rehabilitation Robot that Provides Maxillofacial Massage to Patients with Oral Disorders.
Int. J. Robotics Res.
Hiroyuki Ishii, Hiroki Koga, Yuichi Obokawa, Jorge Solis, Atsuo Takanishi, Akitoshi Katsumata
2008 J jnl
Coding Theorems on the Threshold Scheme for a General Source.
IEEE Trans. Inf. Theory
Hiroki Koga
2007 B conf
Coding Theorems for General Stegosystems.
ISIT
Hiroki Koga, Isao Nakano
2007 J jnl
Source Coding Using Families of Universal Hash Functions.
IEEE Trans. Inf. Theory
Hiroki Koga
2006 J jnl
Basic Properties of the (
Des. Codes Cryptogr.
Hiroki Koga, Etsuyo Ueda
2006 B conf
Proposal of an Asymptotically Contrast-Ideal (t, n)- Threshold Visual Secret Sharing Scheme.
ISIT
Hiroki Koga, Etsuyo Ueda
2005 J jnl
Asymptotic properties on codeword lengths of an optimal FV code for general sources.
IEEE Trans. Inf. Theory
Hiroki Koga, Hirosuke Yamamoto
2005 — conf
Coding theorems on the threshold scheme for a general source.
ICITS
Hiroki Koga
2005 B conf
On an upper bound of the secrecy capacity for a general wiretap channel.
ISIT
Hiroki Koga, Naoki Sato
2004 B conf
Source coding using a class of universal hash functions.
ISIT
Hiroki Koga
2003 C conf
A Constraint-based Grammar of Case : To Correctly Predict Case Phrases Occurring without Their Head Verb.
PACLIC
Hiroki Koga
2003 J jnl
A Visual Secret Sharing Scheme for Color Images Based on Meanvalue-Color Mixing.
IEICE Trans. Fundam. Electron. Commun. Comput. Sci.
Takeru Ishihara, Hiroki Koga
2003 J jnl
On the Problem of Generating Mutually Independent Random Sequences.
IEICE Trans. Fundam. Electron. Commun. Comput. Sci.
Jun Muramatsu, Hiroki Koga, Takafumi Mukouchi
2002 A conf
A General Formula of the (t, n)-Threshold Visual Secret Sharing Scheme.
ASIACRYPT
Hiroki Koga
2002 J jnl
New Constructions of the Lattice-Based Visual Secret Sharing Scheme Using Mixture of Colors.
IEICE Trans. Fundam. Electron. Commun. Comput. Sci.
Takeru Ishihara, Hiroki Koga
1997 A* conf
Proposal of the-law-of-inertia (friction/gravity-free) robots.
ICRA
Suguru Arimoto, Hiroki Koga, Tomohide Naniwa