OPTIMIZATION OF RAILWAY EMPTY CONTAINER ALLOCATION BASED ON TIME UNCERTAINTY AND CONTAINER TYPE SUBSTITUTION

Abstract

Four years have passed in the blink of an eye, and as I write this section, I am filled with mixed emotions. Typing the words "Acknowledgements" signifies the conclusion of my doctoral journey. In the autumn of 2020, I was admitted to the doctoral program at the University of Finance and Economics of Mongolia, embarking on a new academic chapter. This slow yet enriching journey has allowed me to see a broader world and meet many outstanding individuals. Along the way, there are countless people I wish to thank. First and foremost, I am deeply grateful to the teachers who provided me with invaluable guidance and advice throughout my research. My heartfelt thanks go to my supervisor, Professor Otgonbold. D, whose meticulous work ethic has profoundly influenced me and whose support was instrumental during the thesis-writing process. I also extend my gratitude to Professor Bolorsuvd. B and Professor Ganchimeg. J, whose insightful suggestions during the revision phase significantly improved my thesis. In particular, Professor Ganchimeg. J’s thoughtful guidance and help enabled me to complete the revisions swiftly and proceed to the defense stage. I also wish to thank the teachers in the Graduate Programs Team for their support in both academic and personal matters. Additionally, I am grateful to Prof. Ruiyong Wang, Prof. Youdong Li, and Prof. Delong Li, who offered valuable suggestions that greatly benefited my research. Teachers are like guiding lights, illuminating paths far beyond their reach. I sincerely thank each teacher who encouraged and supported me on my academic journey, and I hope their teachings will continue to nurture countless students in the future. The depth of gratitude is as vast as mountains and rivers. I am eternally thankful to my family, especially my parents, for their unconditional love and sacrifices, which have been my greatest source of strength. During my battle with a serious illness, it was their selfless care, companionship, and encouragement that helped me overcome the challenge. I also wish to thank my leaders, colleagues, and friends for their support during this difficult time. Their financial and emotional assistance gave me the courage to persevere. My gratitude is beyond words and will forever remain in my heart. Finally, I wish to express my joy and gratitude for the birth of my son, whose arrival has brought new life and hope to my family. Your presence has added a bright color to my world and inspired me to move forward with renewed determination. I also thank myself for enduring the ups and downs of this journey and overcoming countless trials along the way. The future remains bright, and I wish for happiness, health, and prosperity in the years to come.