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Author: Carlos Alberto Lagos Salgado Publisher: ISBN: Category : Languages : es Pages : 0
Book Description
Una aparición inesperada de tareas de mantenimiento puede producir cambios significativos y costosos en la operación de una aerolínea. Cuando se trata de tareas críticas, incluso podría ser necesario cancelar vuelos programados. A pesar de ello, el desafío de planificar las operaciones de mantenimiento de aviones bajo incertidumbre ha recibido limitada atención de parte de la literatura científica. Se estudió un problema de planificación de mantenimiento de una aerolínea que involucra decidir diariamente qué aeronaves mantener y seleccionar el conjunto de tareas pendientes a ejecutar en cada aeronave. El objetivo del problema es minimizar el costo total esperado por las tareas que expiran en el horizonte operativo. Para aumentar flexibilidad y reducir costos, integramos la planificación de mantenimiento con la asignación de LOFs a aviones. Formulamos el problema como un proceso de decisión markoviano y diseñamos políticas basadas en programación dinámica aproximada. En un caso de estudio basado en una aerolínea latinoamericana, mostramos el valor dela optimización dinámica al comparar el costo de nuestras políticas contra el de una regla de decisión simplificada de la aerolínea y una cota con información perfecta del proceso de arribo de tareas. Nuestra política propuesta previene AOGs, alcanza una cobertura de tareas del 97,57% y muestra una reducción promedio en las tareas vencidas de 83,75% con respecto a la regla de la aerolínea. Además, nuestra política tiene un costo promedio un 2,64% mayor que la cota de información perfecta. Para aumentar la utilización de la capacidad residual, nuestras políticas adelantan el mantenimiento de tareas pendientes que requieren un bajo consumo de recursos. También sugerimos que existen significativas economías de escala cuando se comparten recursos de mantenimiento entre aerolíneas.
Author: Carlos Alberto Lagos Salgado Publisher: ISBN: Category : Languages : es Pages : 0
Book Description
Una aparición inesperada de tareas de mantenimiento puede producir cambios significativos y costosos en la operación de una aerolínea. Cuando se trata de tareas críticas, incluso podría ser necesario cancelar vuelos programados. A pesar de ello, el desafío de planificar las operaciones de mantenimiento de aviones bajo incertidumbre ha recibido limitada atención de parte de la literatura científica. Se estudió un problema de planificación de mantenimiento de una aerolínea que involucra decidir diariamente qué aeronaves mantener y seleccionar el conjunto de tareas pendientes a ejecutar en cada aeronave. El objetivo del problema es minimizar el costo total esperado por las tareas que expiran en el horizonte operativo. Para aumentar flexibilidad y reducir costos, integramos la planificación de mantenimiento con la asignación de LOFs a aviones. Formulamos el problema como un proceso de decisión markoviano y diseñamos políticas basadas en programación dinámica aproximada. En un caso de estudio basado en una aerolínea latinoamericana, mostramos el valor dela optimización dinámica al comparar el costo de nuestras políticas contra el de una regla de decisión simplificada de la aerolínea y una cota con información perfecta del proceso de arribo de tareas. Nuestra política propuesta previene AOGs, alcanza una cobertura de tareas del 97,57% y muestra una reducción promedio en las tareas vencidas de 83,75% con respecto a la regla de la aerolínea. Además, nuestra política tiene un costo promedio un 2,64% mayor que la cota de información perfecta. Para aumentar la utilización de la capacidad residual, nuestras políticas adelantan el mantenimiento de tareas pendientes que requieren un bajo consumo de recursos. También sugerimos que existen significativas economías de escala cuando se comparten recursos de mantenimiento entre aerolíneas.
Author: John Moubray Publisher: Industrial Press Inc. ISBN: 9780831131463 Category : Business & Economics Languages : en Pages : 452
Book Description
Completely reorganised and comprehensively rewritten for its second edition, this guide to reliability-centred maintenance develops techniques which are practised by over 250 affiliated organisations worldwide.
Author: Greg Wilson Publisher: CRC Press ISBN: 1000728153 Category : Computers Languages : en Pages : 250
Book Description
Hundreds of grassroots groups have sprung up around the world to teach programming, web design, robotics, and other skills outside traditional classrooms. These groups exist so that people don't have to learn these things on their own, but ironically, their founders and instructors are often teaching themselves how to teach. There's a better way. This book presents evidence-based practices that will help you create and deliver lessons that work and build a teaching community around them. Topics include the differences between different kinds of learners, diagnosing and correcting misunderstandings, teaching as a performance art, what motivates and demotivates adult learners, how to be a good ally, fostering a healthy community, getting the word out, and building alliances with like-minded groups. The book includes over a hundred exercises that can be done individually or in groups, over 350 references, and a glossary to help you navigate educational jargon.
Author: Haim Mazar (Madjar) Publisher: John Wiley & Sons ISBN: 1118511794 Category : Science Languages : en Pages : 460
Book Description
This book presents the fundamentals of wireless communications and services, explaining in detail what RF spectrum management is, why it is important, which are the authorities regulating the use of spectrum, and how is it managed and enforced at the international, regional and national levels. The book offers insights to the engineering, regulatory, economic, legal, management policy-making aspects involved. Real-world case studies are presented to depict the various approaches in different countries, and valuable lessons are drawn. The topics are addressed by engineers, advocates and economists employed by national and international spectrum regulators. The book is a tool that will allow the international regional and national regulators to better manage the RF spectrum, and will help operators and suppliers of wireless communications to better understand their regulators.
Author: Peter Hall Publisher: Wiley-Blackwell ISBN: 9780631199434 Category : Social Science Languages : en Pages : 502
Book Description
Cities of Tomorrow is a critical history of planning in theory and practice in the twentieth century, as well as of the social and economic problems and opportunities that gave rise to it. Trenchant, perceptive, global in coverage, this book is an unrivalled account of its crucial subject. The third edition of Cities of Tomorrow is comprehensively revised to take account of abundant new literature published since its original appearance, and to view the 1990s in historical perspective. This is the definitive edition, reviewing the development of the modern planning movement over the entire span of the twentieth century.
Author: Robert S. Pindyck Publisher: McGraw-Hill/Irwin ISBN: 9780079132925 Category : Business & Economics Languages : en Pages : 664
Book Description
This well known text helps students understand the art of model building - what type of model to build, building the appropriate model, testing it statistically, and applying the model to practical problems in forecasting and analysis.
Author: Jorge Garza Ulloa Publisher: Academic Press ISBN: 0128125950 Category : Technology & Engineering Languages : en Pages : 664
Book Description
Applied Biomechatronics Using Mathematical Models provides an appropriate methodology to detect and measure diseases and injuries relating to human kinematics and kinetics. It features mathematical models that, when applied to engineering principles and techniques in the medical field, can be used in assistive devices that work with bodily signals. The use of data in the kinematics and kinetics analysis of the human body, including musculoskeletal kinetics and joints and their relationship to the central nervous system (CNS) is covered, helping users understand how the complex network of symbiotic systems in the skeletal and muscular system work together to allow movement controlled by the CNS. With the use of appropriate electronic sensors at specific areas connected to bio-instruments, we can obtain enough information to create a mathematical model for assistive devices by analyzing the kinematics and kinetics of the human body. The mathematical models developed in this book can provide more effective devices for use in aiding and improving the function of the body in relation to a variety of injuries and diseases. - Focuses on the mathematical modeling of human kinematics and kinetics - Teaches users how to obtain faster results with these mathematical models - Includes a companion website with additional content that presents MATLAB examples
Author: Eric Dinerstein Publisher: World Bank Publications ISBN: Category : Nature Languages : en Pages : 172
Book Description
Approach; Major ecosystem types, major habitat types, and ecoregions of LAC; Conservation status of terretrial ecoregions of LAC; Biological distinctiveness of territorial ecoregions of LAC at different biogeographic scales results; Integrating biological distinctiveness and conservation status; Conservation assessment of mangrove ecosystems.
Author: Metcalf & Eddy, Inc., an AECOM Company Publisher: McGraw Hill Professional ISBN: 0071508775 Category : Technology & Engineering Languages : en Pages : 1610
Book Description
An Integrated Approach to Managing the World's Water Resources Water Reuse: Issues, Technologies, and Applications equips water/wastewater students, engineers, scientists, and professionals with a definitive account of the latest water reclamation, recycling, and reuse theory and practice. This landmark textbook presents an integrated approach to all aspects of water reuse _ from public health protection to water quality criteria and regulations to advanced technology to implementation issues. Filled with over 500 detailed illustrations and photographs, Water Reuse: Issues, Technology, and Applications features: In-depth coverage of cutting-edge water reclamation and reuse applications Current issues and developments in public health and environmental protection criteria, regulations, and risk management Review of current advanced treatment technologies, new developments, and practices Special emphasis on process reliability and multiple barrier concepts approach Consideration of satellite and decentralized water reuse facilities Consideration of planning and public participation of water reuse Inside This Landmark Water/Wastewater Management Tool • Water Reuse: An Introduction • Health and Environmental Concerns in Water Reuse • Technologies and Systems for Water Reclamation and Reuse • Water Reuse Applications • Implementing Water Reuse
Author: Mogens Henze Publisher: IWA Publishing (International Water Assoc) ISBN: Category : Science Languages : en Pages : 170
Book Description
For information on the online course in Biological Wastewater Treatment from UNESCO-IHE, visit: http://www.iwapublishing.co.uk/books/biological-wastewater-treatment-online-course-principles-modeling-and-design Over the past twenty years, the knowledge and understanding of wastewater treatment have advanced extensively and moved away from empirically-based approaches to a first principles approach embracing chemistry, microbiology, physical and bioprocess engineering, and mathematics. Many of these advances have matured to the degree that they have been codified into mathematical models for simulation with computers. For a new generation of young scientists and engineers entering the wastewater treatment profession, the quantity, complexity and diversity of these new developments can be overwhelming, particularly in developing countries where access is not readily available to advanced level tertiary education courses in wastewater treatment. Biological Wastewater Treatment addresses this deficiency. It assembles and integrates the postgraduate course material of a dozen or so professors from research groups around the world that have made significant contributions to the advances in wastewater treatment. The book forms part of an internet-based curriculum in biological wastewater treatment which also includes: Summarized lecture handouts of the topics covered in book Filmed lectures by the author professors Tutorial exercises for students self-learning Upon completion of this curriculum the modern approach of modelling and simulation to wastewater treatment plant design and operation, be it activated sludge, biological nitrogen and phosphorus removal, secondary settling tanks or biofilm systems, can be embraced with deeper insight, advanced knowledge and greater confidence.
Author: Carlos Alberto Lagos Salgado
Author: Carlos Alberto Lagos Salgado
Author: John Moubray
Author: Greg Wilson
Author: Haim Mazar (Madjar)
Author: Peter Hall
Author: Robert S. Pindyck
Author: Jorge Garza Ulloa
Author: Eric Dinerstein
Author: Metcalf & Eddy, Inc., an AECOM Company
Author: Mogens Henze