List of Dissertation Abstract (Information Media and Environment Sciences)
NameSupervisor

Title

Abstract
This study explores higher-level color perceptions ofHarumi

Katsunori

Modeling of higher-level color

SAITO

OKAJIMA

perception in different color vision color-vision
characteristics

deficiencies,

utilizing

psychophysicalmethods and experiments. The experiment results showthat color impressions of dichromats are similar to that oftrichromats, whereas the performance of dichromats aretotally different from that of trichromats with their color
naming task. Here, note that “color impression” stands forwarmness or meaning of colors. Deliverables of the study
provides useful guidelines for upcoming color design
considering the diversity of color vision characteristics.

Kosaku

Tomoharu

A study on automatic construction In the machine learning community, data augmentation

FUJITANAGAO

of training images by using
Evolutionary Image Processing

techniques have been widely used to make deep neuralnetworks invariant to object transition. However, lessattention has been paid to data augmentation in
traditional classification methods. In this paper, we takea closer look at traditional classification methods andintroduce a new data augmentation technique based on
the concept of image transformation. Starting with a few
existing examples, we add noise and generate new data
points to reduce sparseness in a given feature space.
Then, we generate images corresponding to the newdata points, although this is usually an ill-posedproblem. Herein, the novelty is in constructing an imagetransformation tree and generating new data from asmall number of instances. This allows us to reducesparseness in the feature space and build more robust
classifiers. We evaluate our method on the Caltech-101
dataset to verify its potential. In the context of thesituation where the amount of training data is limited,
we demonstrate that the support vector machine-basedclassifiers trained with an augmented dataset using ourmethod outperform classifiers trained with the original
dataset in most cases.

Yoshihiro

Atsuhiro

Coloring and reductions of graphs

A generating theorem for a graph class C on a closed

ASAYAMA

NAKAMOTO

on surfaces

surface is to determine minimal graphs D andtransformations X such that every graph in C can begenerated from D by X. In this paper, I deal with thegeneration theorems of triangulations on closed surfaces
and prove the generating theorem of even triangulations
on the Klein bottle and show that it can be applied tovarious coloring problems. We also introduce a result for
the "dynamic coloring" of triangulations on the plane byusing the generating theorem.

CHUN-JUNG Tsutomu
WU

MATSUMOTO

A Study on Observation, Analysis,

Recently, cyber attacks in IoT become increasingly

and Countermeasure of Cyberrampant. Mirai Botnets executed the massive distributed

Attacks in IoTdenial of service (DDoS) attack since 2016. IoT malware
plays a significant role, and therefore countermeasures
are required. When thinking of malware
countermeasures, it is essential to understand theirbehavior. Machine learning-based analysis, in whichanalyzing malware attack vector s, has been widelyused. In this dissertation, we propose a machinelearning-based classification/clustering method against
IoT malware and a whitelisting-based countermeasure
for low- cost IoT devices.

HisaoTsutomu

A Study on ATM Security

Recently, criminals frequently carry out logical attacks onOGATAMATSUMOTO

Measures by CommandATMs (Automated Teller Machines) systems to steal cash

Verificationfrom ATMs in more than 30 countries. In order toeffectively prevent the logical attacks, we proposed
Command Verification that the cash handling module in
the ATM itself validates the cash dispensing command
sent from the PC in the ATM, which is the control unit of
the ATM, instead of protecting the PC. In addition, we also
proposed that a general application scheme of Command
Verification which is applicable to multiple ATM systems
and transactions. (Updated summary)YumikoSeiya

Facially-constrained colorings ofA facially-constrained coloring is a coloring of a graph onOHNONEGAMI

triangulations on closed surfaces

a closed surface with additional conditions of vertices onboundaries of each face. A triangulation is a graph on aclosed surface such that any face is triangular. In thisstudy, we consider a facially-constrained coloring of atriangulation such that three vertices on the boundary ofeach face receive three consecutive colors when wedefine the set of n colors as a cyclic group. Moreover, weconsider a facially-constrained coloring of a triangulation

G such that any triple of colors appears on vertices of theboundaries of faces in G.

JunichiTsutomu

A Study on Laser Fault Attacks

This paper shows a new attack that is caused by laser

SAKAMOTO

MATSUMOTO

and Countermeasures inirradiation onto a flash memory. We call this attack

Embedded Processors"instruction manipulation". Defeating an existing antifault

countermeasure

manipulation

presents

schemetheby

thenecessity

instruction
ofanewcountermeasure against the instruction manipulation. We
model the ability of the instruction manipulation fromobtained experimental results, and propose a softwarecountermeasure against the instruction manipulation.
Moreover, this paper proposes a program extraction
method to ease instruction manipulation.

ShingoJunji

A Study on Cryptography

In recent years, the development of quantum computers

SATO

SHIKATA

Resistant to Quantum Computing

has been progressed, and the performance has beenimproved. If sufficiently large-scale quantum computers
are built in the future, current widely used cryptosystems
are broken theoretically. Thus, it is important to design
constructions of cryptography resistant to quantum
computing (post-quantum cryptography). In this thesis,
wefocusonpost-quantum

cryptography

withconfidentiality or integrity, in security models in which
many users can use quantum computers. We propose
constructions of encryption and authentication, and provethat these satisfy confidentiality or integrity in thesecurity models.

KazukiTsutomu

A Study on Analysis andTAKADA

MATSUMOTO Countermeasure against MITB
Attack based on Long-term
Observation of Financial Malware

Fraudulent financial transfer via MITB attack havebecome major threats. This research aims to develop
MITB attack countermeasures. I propose analysis methodof MITB attack based on long-term observation for
financial malwares. In addition, in general, cyber attacks
and countermeasures have the problem that attackers
and defenders compete with each other and fall into the``Attack and defense infinite loop''. Therefore, I propose
MITB attack countermeasure ecosystem that canmitigate MITB attacks by updating the countermeasuresappropriately and can finally end the Attack and defense
infinite loop with defender advantage.