Cover Page
The handle
http://hdl.handle.net/1887/84693
holds various files of this Leiden
University dissertation.
Author: Ertiningsih, D.
Title: Structural Properties of Single Server Queueing Systems: Efficient Methods via
Lumping and Dynamic Programming
Acknowledgements
The completion of my PhD program required the help and support of many people. During my stay in The Netherlands (September, 2011 - August, 2015) I have met people who have given me a lot of professional or personal help. Therefore, I would like to thank all people who helped me to finish this thesis.
First of all, notwithstanding tradition, I want to express my special gratitude to my promotor Dr. Flora Spieksma. Without her kind understanding and professional support I would not have been able to finish this thesis. I would like to thank Prof. Dr. Frank den Hollander for his thoughtful co-supervision of my study. Furthermore, I would like to thank Prof. Dr. Michael Katehakis and Prof. Dr. Sandjai Bhulai for the collaboration and fruitful discussion in the last years.
I would like to thank all members of the Stochastic Operations Research group Universiteit Leiden, The Netherlands. A special thank goes to my former PhD mates Laurens Smit, Herman Blok and Martin G¨oll. I thank you for the stimulating ideas, discussions and friendship during my research work in Leiden.
Further, I would like to thank all members of the Department of Mathematics, Faculty of Mathematics and Natural sciences (FMIPA), Universitas Gadjah Mada (UGM), Yogyakarta, Indonesia, especially Prof. Dr. Widodo, MSc., as my former supervisor (in the bachelor and master programs), for his warm support on my career and Dr. Fajar Adi Kusumo, MSc., as the head of Applied Mathematics Laboratory, for his valuable advice and motivation to finish my study.
I am also grateful for the funding received through the DGHE (Directorate General of Higher Education) Scholarship, the Directorate General of Human Resource for Science, Technology and Higher Education of the Ministry of Research, Republic of Indonesia.
Last but not least, I would like to thank my beloved husband, Eko Dwi Feranto, and our adorable daughter, Fatikha Rizqina Eka Putri, for their love, patience, and understanding during my long stay abroad. Finally I would like to express my thanks to my parents and family for their continuous love and support.
Curriculum Vitae
Dwi Ertiningsih was born in Sleman, Indonesia on March 7, 1984. She studied at the Universitas Gadjah Mada (UGM), Yogyakarta, Indonesia and completed her Bachelor degree in Mathematics in 2005. She then became a staff member at UGM and contin-ued her study (Master program, 2005) at the same department under the supervision of Prof. Dr. Widodo, M.Sc. She received her master’s degree in Mathematics in 2007. She was awarded a DGHE (Directorate General of Higher Education) Scholarship of the Ministry of Research, Technology and Higher Education of the Republic of Indone-sia to do her PhD research on Stochastic Operation Research, in 2011. She became a PhD student of Stochastic Operations Research, in the Probability Theory group, at the Department of Mathematics, Universiteit Leiden, The Netherlands. Her supervisor was Dr. F. M. Spieksma and her co-supervisor was Prof. Dr. W. Th. F. den Hollander. She is currently employed as a lecturer at the Applied Mathematics Lab of the Department of Mathematics, Faculty of Mathematics and Natural Sciences, Universitas Gadjah Mada, Yogyakarta, Indonesia.
