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

Title

Abstract
In this thesis, we consider the k-upper bound graph of a poset P=(X,≦), which is the simple undirected graph

GenAtsuhiro

KAWATANINAKAMOTO

Graph representation ofpartially ordered sets

G with V(G)=X and uv∈E(G) if and only if u and v have k common upper bounds in P. Generally, a k-upperbound graph has some isolated vertices, and hence we consider the following problem. Given a graph G,
what is the minimum number of isolated vertices added to make G a k-upper bound graph? For this problem,
we obtain an upper bound of the number.

Toshiyuki
Tomoki SAKA
GOTOH

Blood Flow Contribution
Analysis for Pulmonary Arteryand Aorta using Sequential
Contrast Enhanced MRImages

The pulmonary blood flow system consists of pulmonary arterial perfusion and aorta perfusion. Because theaorta perfusion is less than 10% of the pulmonary arterial one, the influence has been excluded by fitting γfunction. In this study, we suggest the numerical analysis method that, by modeling impulse response of a 2inputs system, separate and evaluate 2 systems.
Image segmentation is an image processing method that segments an input image into some regions whosecharacteristics are similar to themselves. Recently, the method of Semantic Segmentation which executes

KenTomoharu

SHIMAZAKINAGAO

A Study on Evolutionary
Image Segmentation

image segmentation and object recognition simultaneously has been studied. In this study, we propose anautomatic construction method of the process for desired segmented image and recognized regions using
evolutionary computation algorithm. Evolutionary computation enables to design the structure of function
and formula such as similar function and calculation for input feature from image flexibly.
Recently, continuous and persistent cyber-attacks that target specific organizations are increasing (TargetedTsutomu
Rui TANABE
MATSUMOTO

A Study on Malware
Detection and Disinfection
Based on Dynamic Analysis

attack). At targeted attack, a highly functionalized malicious program (Malware) plays a great role andtherefore countermeasures against malware are required. When thinking of malware countermeasures, it isimportant to understand their behavior. Malware dynamic analysis, in which malware samples are executedin a testing environment (Sandbox), has been widely used. In this dissertation, we propose malware
countermeasure based on dynamic analysis.

Yuki

Atsuhiro

KAWASAWAKI

NAKAMOTO

Transformations in graphs onsurfaces preserving specified
properties

We research transformations in graphs. Especially, we deal with a local transformation, called an N-flip, ineven triangulations on surfaces. A lot of researchers had considered whether two even triangulations can betransformed into each other by N-flips. In the thesis, we consider whether the transformation can preserve
the specified properties of graphs, for example, the chromatic number or the connectivity.

DaisukeTsutomu

MAKITA

MATSUMOTO

A Study on Observation ofDRDoS Attacks for Proactive

In this paper, we propose observation systems of DRDoS attacks -- a cyberattack which has recently become

Countermeasure and Realtime Response

proactive countermeasure and real-time response against the attacks and discuss the efficiency.

a major threat on the Internet -- and analyze the observational results. In addition, we propose methods forThe system consists of input, process and output. If an attacker operates output, there are two system attack
HanakoNaoki Yoshida
JOUHOUA Study on Clone Resistanceand Tamper Resistancemethods that cheat input and tamper process. We proposed nano artifact-metrics for improving clone
resistance against input attack and self-modifying-based tamper resistant software improving tamper
resistance against process attack.

TsutomuNaoya Torii
Matsumoto

Security Evaluation of
Physical True
Random Number Generator
and Physical Unclonable
Function (PUF) using Latches

For secure key generation and storage for message encryption and the authentication in IoT devices, a latchbased physical true random numbers generator and a latch-based physical unclonable function (PUF) arefabricated in CMOS ASIC. They are small circuit sizes and low power consumptions and show highperformances when the supply voltage and the temperature change within the rated values. In addition, it ispresumed that the PUF has a tolerance by invasive attack experiments using FIB.
The Wulff shape, which was firstly introduced by G. Wulff, is known as a geometric model of a crystal atequilibrium. In this thesis, we introduce a new method (spherical method) to study Wulff shape. The main
results of this thesis as followings.

Takashi
Huhe HANNISHIMURA

Study on Wulff shapes andtheir duals

1. Spherical dual transform is an isometry with respect to the Pempeiu-Hausdorff metric.
2. A Wulff shape is self-dual if and only if the spherical convex body induced by it is of constant width ofπ/2.
3. A Wulff shape is strictly convex if and only if its convex integrand is of class C^{1}.
4.The set consisting of stable convex integrands is dense in the set of C^{∞} convex integrands.