Yihui Sim's Books

Optimal Trajectory Planning and Train Scheduling for Urban Rail Transit Systems

By: Yihui Wang,Bin Ning,Ton van den Boom,Bart De Schutter

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Optimal Trajectory Planning and Train Scheduling for Urban Rail Transit Systems

By: Yihui Wang,Bin Ning,Ton van den Boom,Bart De Schutter

This book contributes to making urban rail transport fast, punctual and energy-efficient –significant factors in the importance of public transportation systems to economic, environmental and social requirements at both municipal and national levels. It proposes new methods for shortening passenger travel times and for reducing energy consumption, addressing two major topics: (1) train trajectory planning: the authors derive a nonlinear model for the operation of trains and present several approaches for calculating optimal and energy-efficient trajectories within a given schedule; and (2) train scheduling: the authors develop a train scheduling model for urban rail systems and optimization approaches with which to balance total passenger travel time with energy efficiency and other costs to the operator. Mixed-integer linear programming and pseudospectral methods are among the new methods proposed for single- and multi-train systems for the solution of the nonlinear trajectory planning problem which involves constraints such as varying speed restrictions and maximum traction/braking force. Signaling systems and their effects are also accounted for in the trajectory planning model. Origin–destination passenger demand is included in the model formulation for train scheduling. Iterative convex programming and efficient bi-level approaches are utilized in the solution of the train-scheduling problem. In addition, the splitting rates and route choices of passengers are also optimized from the system point of view. The problems and solutions described in Optimal Trajectory Planning and Train Scheduling for Urban Rail Transit Systems will interest researchers studying public transport systems and logistics whether from an academic or practitioner background as well as providing a real application for anybody studying optimization theory and predictive control.

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Page Count

198

Publisher

Springer

Published Date

ISBN 10

3319308890

ISBN 13

9783319308890

Topology Optimization Theory for Laminar Flow

Applications in Inverse Design of Microfluidics

By: Yongbo Deng,Yihui Wu,Zhenyu Liu

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Topology Optimization Theory for Laminar Flow

Applications in Inverse Design of Microfluidics

By: Yongbo Deng,Yihui Wu,Zhenyu Liu

This book presents the topology optimization theory for laminar flows with low and moderate Reynolds numbers, based on the density method and level-set method, respectively. The density-method-based theory offers efficient convergence, while the level-set-method-based theory can provide anaccurate mathematical expression of the structural boundary. Unsteady, body-force-driven and two-phase properties are basic characteristics of the laminar flows. The book discusses these properties, which are typical of microfluidics and one of the research hotspots in the area of Micro-Electro-Mechanical Systems (MEMS), providing an efficient inverse design approach for microfluidic structures. To demonstrate the applications of this topology optimization theory in the context of microfluidics, it also investigates inverse design for the micromixer, microvalve and micropump, which are key elements in lab-on-chip devices.

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Page Count

257

Publisher

Springer

Published Date

ISBN 10

9811046875

ISBN 13

9789811046872

Dynamic Documents with R and knitr

By: Yihui Xie

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Dynamic Documents with R and knitr

By: Yihui Xie

Quickly and Easily Write Dynamic Documents Suitable for both beginners and advanced users, Dynamic Documents with R and knitr, Second Edition makes writing statistical reports easier by integrating computing directly with reporting. Reports range from homework, projects, exams, books, blogs, and web pages to virtually any documents related to statistical graphics, computing, and data analysis. The book covers basic applications for beginners while guiding power users in understanding the extensibility of the knitr package. New to the Second Edition A new chapter that introduces R Markdown v2 Changes that reflect improvements in the knitr package New sections on generating tables, defining custom printing methods for objects in code chunks, the C/Fortran engines, the Stan engine, running engines in a persistent session, and starting a local server to serve dynamic documents Boost Your Productivity in Statistical Report Writing and Make Your Scientific Computing with R Reproducible Like its highly praised predecessor, this edition shows you how to improve your efficiency in writing reports. The book takes you from program output to publication-quality reports, helping you fine-tune every aspect of your report.

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Page Count

294

Publisher

CRC Press

Published Date

ISBN 10

1498716970

ISBN 13

9781498716970

Book's by Yihui Sim

Optimal Trajectory Planning and Train Scheduling for Urban Rail Transit Systems

Optimal Trajectory Planning and Train Scheduling for Urban Rail Transit Systems

Topology Optimization Theory for Laminar Flow

Topology Optimization Theory for Laminar Flow

Dynamic Documents with R and knitr

Dynamic Documents with R and knitr

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