ACKNOWLEDGEMENT The book “Assembly Line Rebalancing with Non?constant Task Time Attribute” concludes my career as a Ph.D.student at Rutgers University.It is a great journey that I could never imagine I have finished in such an amazing way.Not only the unanimous passes but also the greatest ever compliments receiving from all committee members of my defense do make me feel all the gritty effort of the past four years finally starts paying off.I devote the book to my dearest grandpa Ding Can (丁灿)who is always a true believer that I can be and will be a faculty material at a university.My beloved parents, Li Jin (李进) and Ding Shangtao(丁上陶) provide me untiring, unconditional supports which lead me this far.My beautiful wife Liu Zhenyi(刘珍一), who makes me want to be a better man since we embark on the journey of love. My grandmas Han Caijun (韩采军), Liu Xiaodong(刘晓东) and grandpa Li Xiufeng(李秀峰) are also supportive and inclusive during my Ph. D. career. There are no words to describe how important they are to me. I am so grateful to be the intersection of the harmonious family.My adviser, Dr.Thomas Boucher, who has been inspiring me from day 1 when I got into the ISE program.He opened the door of my research and help me clean all of the road bumps on the path of completing the book.Thank you, Mr.big picture, I am grateful to be your apprentice.Now, my friends, who sit tight in the cheering section offering me everything they could possibly offer when I am in dire need.Zhao Youhu comforted me and shared his experience when I hit my bottom and could not escape the trough on my own.Lu Chenguang(卢晨光), Wong Ching(王婧), and Zhang Yi(张翼)are always there to soothe the pain of my loneliness when I need company.I am grateful to be your lifelong friends.I also appreciate my cohorts, Sanchoy Das, Susan Albin, Wang Honggang, David Coit, and David Nembhard for their invaluable advice on how to shape the book crystal clear and rock solid.Ultimately, I pay tribute to Prof. Liu Chao (刘超)and School of Economics and Management, Beijing University of Technology for their sponsorship. I wish the book would provide the readers a whole new perspective to the line balancing area.I also ask for your forgiveness in advance for any inaccurate and insufficient statements I made throughout my book. LI Yuchen atLibrary of Science and Medicine café lounge09/12/2016
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