List of Dissertation Abstract (Risk Management and Environmental Sciences)
Name
MakotoHIRAYAMA

Supervisor

Title

Abstract

Naoya KASAI

Research on physical risk

Hydrogen vehicle fuel dispensers have a relatively large

analysis of hydrogen

impact on the general public compared to other hydrogenequipmentequipment. In this research, the physical risks of hydrogendispensers were analyzed. The adequacy of existing safetymeasures was verified and advanced safety measures
were proposed. Furthermore, comparative risk study ofhydrogen and gasoline dispensers was conducted toprovide additional insight for risk communication.

AgengSadnowo Naoya KASAIREPELIANTO

Development of Uniform

There are two factors that indicate the effect in increasing

Eddy Current Probes using

the sensitivity of a Uniform eddy current (UEC) probe

Multi Excitation Coils

design. First is the configuration of the excitation coil andthe detection coil. It must be developed so that theexcitation coil and detection coil produce higher induction
current densities and cause an increase in electromotive
force in response to flaws. Second is the shape andorientation of the detector coil, to be determined, whether
in the shape of a single coil or it is built from two or several
coils. The self-differential and self-nulling natures of thedetector coil should be considered. The development of anew one-directional UEC probe using multi excitation coilsin the pancake orientation can increase the sensitivity ofthe probe, and it has the characteristics of self-nulling andself-differential.

Kazuhiko SANO

Hideo OHTANI Study on cost-effectiveness A study was conducted to prevent fire and explosionof capital investment thataccidents at monomer production plants. Study stepscontributes to the judgment related to the cost-effectiveness of safey investmentsof effectiveness of safety

were proposed, and a decision-making process forinvestment in monomer

executing the investments was established. The method

production plants

was applied to an acrylonitrile plant reactor, and theeffectiveness of the method was demonstrated.

YosukeMieko

Degradation of pyrotechnics Pyrotechnics have been used in various fields, andNISHIWAKIKUMASAKI

compositions by water and performance change of the pyrotechnics which is caused
its hazards

by degradation leads to accidents and other problems.
Water is known as one of the causes of degradation. In thisstudy, degradation by water was summarized, anddegradation mechanisms of pyrotechnics compositions
which are used for fireworks and gas-generating agentswere revealed. And the problems of degradation of thesecompositions were observed. Measures for degradation
were proposed from the revealed mechanisms andproblems. Additionally, knowledge which is applicable todegradation of various pyrotechnics compositions wasobtained from this study.

Binay SANGAT

Fumito KOIKE

Sustainable nitrogen

Conservation agriculture(CA) is one of the sustainable

management using weed

agriculture practices. This thesis is based on no-tillage

mulch in no-tillage

with the weed management system(NTW), which follows

conservation agriculture

the principles of CA. The distinct characteristic of NTW issystem

the naturally occurring weeds, which are grown together
with the crops. Weeds are usually controlled by using
herbicides, which harms the crops and as well theenvironment. However, NTW controls and utilizes weeds asa nitrogen resource by slashing and mulching practice.
Hence, using weeds as a nitrogen resource may minimize
the need for external input and cost, eventually reducing
the N loss from the agriculture lands.

MaheshTadahiro

Accident Modelling andThe overall objective of this Ph.D thesis has been toKODOTHSHIBUTANI

Uncertainty Assessment indevelop strategies for addressing uncertainties in the risk

Risk and Reliability

assessment. It addresses Accident Modelling andQuantifications to support

Improvement in Risk and Reliability Quantifications based

New Technology System

on Probabilistic and Statistical Modelling to support New

using Bayesian Approach

Process Technology Risk Assessment. The concept of theresearch aims at addressing uncertainties in risk andaccident modelling by using dynamic bayesian based
assessment.