LUVARNA forever

Saturday, August 26, 2006


I am extremely grateful to my supervisor, Professor Shinji Sato, who offered the most valuable guidance and continuous encouragement throughout the whole study. The constructive suggestions and helps from Professor Masahiko Isobe, Yoshimitsu Tajima and Yoshinobu Tsuji are also highly appreciated. I am indebted to my co-supervisor, Associate Professor Matsumoto, for providing me comments and suggestions in my research work.

I would like to express my appreciation to former Associate Researcher Takahide Honda for the helpful assistance and fruitful discussions on this study. Special thanks also to Mr. Takenori Shimozono for lots of help in MATLAB programming language. Thanks also to Associate Professor Guangwei Huang and Yukio Koibuchi.

Thanks and appreciation are also extended to laboratory’s secretaries, Miss. Hiroko Yamakami and Miss. Yoko Kodama as well as all members of Coastal Engineering Laboratory, for providing endless help and sharing a delightful and memorable life. Thanks to Mr. Junya Suzuki, my life tutors, for providing great assistances during my stay in Tokyo.

Appreciations to Foreign Student Officers: Ms. Nakamura and Ms. Hayashi for providing valuable information that facilitates my life in Japan. Thanks also to staffs of Faculty of Engineering (Reppin-kan) and Japanese Language Class teachers of the Department of Civil Engineering, who offered me the basic Japanese skills.

Finally, I wish to extend my sincere and special thanks to my parents and my girlfriend for their constant encouragement. With their spiritual support I overcame the difficulties both from study and life.

This study was supported by the Asian Development Bank-Japan Scholarship Program, which made my study in Japan possible.

Tuesday, August 22, 2006

Yuliarko's Master Thesis

This study is concerned with the development of a high-order numerical model to solve incompressible water wave motion based on improved nonlinear dispersive Boussinesq equations. A third-order Adams-Bashforth and a fourth-order Adams-Mouton predictor-corrector scheme was selected in an attempt to eliminate the truncation error terms that would be of the same form as the dispersive terms in the Boussinesq equations with second order schemes as in many other studies.

Eddy viscosity type momentum correction term was added into the Boussinesq equation to simulate the energy loss due to wave breaking and to extend the model application to surf zone wave transformation. The location of the breaking point was determined through a wave breaking criterion using the ratio of horizontal water particle velocity to wave celerity.

A moving boundary technique utilizing linear extrapolation is developed to investigate wave runup and rundown. Wave absorption at an open boundary was simulated by solving the Sommerfeld radiation and introducing sponge layer into the model.

Breaking regular wave runup propagation on a sloping beach is simulated. It would seem that inclusion of an accurate dissipation term becomes increasingly important with increasing degree of wave breaking. In regard to breaking regular wave runup simulation, additional dissipation term acted as bottom friction was required for long term stability in surf zone area. The validity of the model was confirmed by comparing computations with analytical solutions and measured data.

Friday, August 04, 2006


Ketika perbedaan itu ada,
Disitulah kita harus belajar memahami..
Bersatu untuk mengerti,
Bukan saling diam tak bersuara..

Ego ini tidak bisa terima,
Karena berpendapat kita benar..
Timbul keputusan untuk berpisah,
Walau itu sangat menyakitkan..

Ternyata keputusan yang salah,
Karena tanpa pemikiran yg panjang..
Berpisah itu amat menyakitkan,
Maafkan aku kekasihku..

Kuharap kau selalu hadir,
Dalam suka maupun duka..
Saat ini dan sampai maut memisahkan kami..

Jangan pisahkan kami,
Dengan perbedaan yang ada..
Tuntunlah kami selalu,
Menjalani hari-hari untuk bersama selamanya..

neng keyna luv akang arko

Fri, 4 Aug 2006 08:44:48 +0700