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"This book constitutes the thoroughly refereed post-conference proceedings of the 18th International Conference on Principles and Practice of Constraint Programming (CP 2012), held in Québec, Canada, in October 2012. The 68 revised full papers were carefully selected from 186 submissions. Beside the technical program, the conference featured two special tracks. The former was the traditional application track, which focused on industrial and academic uses of constraint technology and its comparison and integration with other optimization techniques (MIP, local search, SAT, etc.) The second track, featured for the first time in 2012, concentrated on multidisciplinary papers, cross-cutting methodology and challenging applications collecting papers that link CP technology with other techniques like machine learning, data mining, game theory, simulation, knowledge compilation, visualization, control theory, and robotics. In addition, the track focused on challenging application fields with a high social impact such as CP for life sciences, sustainability, energy efficiency, web, social sciences, finance, and verification."

"The 26 revised full papers presented were carefully reviewed and selected from 64 submissions. The papers are focused on both theoretical and practical, application-oriented issues in combinatorial optimization and feature current research with a special focus on inference and relaxation methods, integration methods, modeling methods, innovative applications of CP/AI/OR techniques, and implementation of CP/AI/OR techniques and optimization systems."

"Penelitian ini melihat perbedaan dari kinerja operasional abnormal yang dialami perusahaan-perusahaan non-keuangan di Indonesia yang melakukan open-market share repurchase selama periode 1999-2011. Secara lebih mendalam, penelitian ini juga melihat pengaruh dari adanya financial constraint pada perusahaan terhadap perubahan kinerja operasional abnormal perusahaan tersebut. Dari pengujian yang dilakukan, rata-rata kinerja operasional abnormal perusahaan secara signifikan berbeda saat sebelum dan setelah share repurchase, baik pada perusahaan non-financially constrained maupun perusahaan financially constrained. Adanya financial constraint secara signifikan memberikan pengaruh negative terhadap perubahan kinerja operasional abnormal perusahaan dalam kurun waktu delapan kuartal setelah share repurchase.

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This study examines the abnormal operating performance difference of non-financial company which announced open-market share repurchase during 1999-2011 in Indonesia. Furthermore, this also examine the influence of financial constraints towards the change of abnormal operating performance within eight quarters after they repurchased their shares. They display significance difference of abnormal operating performance after the repurchase program. The existence of financial constraint in the company significantly influenced the change of their abnormal operating performance negatively which affect financially constrained companies to perform poorer than non-financially constrained companies after share repurchase program."