9 research outputs found
Criticality of infrastructure networks under consideration of resilience-based maintenance strategies using the example of inland waterways
Transportation infrastructures as backbone of modern, globalized, and networked societies ensure flows of people and goods and thus sustain social and economic prosperity. Concurrently, more and more infrastructure construction assets are facing the problem of systematic obsolescence due to deficient structural conditions, maintenance backlogs, and a lack of or misallocation of resources for the construction and maintenance of infrastructure buildings. This problem construct necessitates
a resilience-based maintenance strategy for the asset portfolio. In particular, inland navigation as a mode of transport features large transport volumes and few redundancies. Combined with its increasing importance due to its comparatively high environmental friendliness, a predestined, yet in the literature underrepresented research subject results.
This dissertation aims to investigate essential factors of infrastructure management and thereby identify the potential for improvement in the complex construct of maintenance management and related areas. The emphasis is on enhancing the resilience of inland waterways as a complex System-of-Systems with all its interdependencies. Thus, a holistic risk and resilience assessment is essential and is underlined with the aspects infrastructure availability and business decisions (Study A, B, C and D) and stakeholder communication and risk analysis (Study E, F, G) which are addressed by seven studies published as companion articles.
Study A deals with assessing the reliability of transport infrastructure networks as part of supply chains, highlighting the importance of available and thus maintained infrastructure assets for functioning supply chains. Study B aims to identify critical warning times before closures of transport infrastructure networks and therefore suggests a mixed-methods approach, making it possible to derive and evaluate critical thresholds. Study C examines the corresponding company decisions, i.e., decisions as reaction towards neglected maintenance of public transport infrastructure, which comprises risk coping strategies, examined by empirical investigations. Study D extends this problem observation by showing that companies could see incentives for outsourcing if they face a lack of access to available transport infrastructure. Hence, the study analyzes facility relocation problems in dependence on infrastructure availability.
Study E heads toward stakeholder communication and risk analysis and examines the processes across stakeholders, using an approach of collaborative serious gaming, which simultaneously enhances situation awareness and communication among stakeholders. Study F provides the implementation of a systemic approach and its visualization as a GIS-based risk dashboard, shedding light on interdependencies among critical infrastructures and cascading effects. Study G closes with an examination of the evaluation of the potential of infrastructure funds. For this purpose, the study conducts an online survey to determine investorsâ willingness to pay for various fund mechanisms, integrating the option of private coverage.
Despite the geographic focus of the case studies on Germany, valuable insights can be gained for infrastructure management that can also apply to other countries. In addition to the case study findings, general recommendations for infrastructure owners are derived. As a result, it can be stated that it is essential that maintenance strategies have to be more resilience-based than traditional strategies, which are mainly based on fixed time intervals for maintenance. Moreover, the application of both serious gaming and GIS visualization can help to enhance situation awareness and thus the resilience of infrastructure systems. An essential finding for which this dissertation provides methodological approaches is that considering the local areaâs attractiveness for business locations should receive more attention regarding investment decisions. Thereby a focus should be set on the realistic threat of relocations as response to deteriorating infrastructure conditions. Eventually, public debates should strengthen the knowledge about infrastructure and its funding, while deficits in alongside mechanisms in infrastructure funding must be encountered.
Consequently, this dissertation provides insights into the potential of infrastructure management. Mainly, it offers the potential to improve the resilience of the waterway transportation system and address stakeholders accordingly
The Multi-Agent Transport Simulation MATSim
"The MATSim (Multi-Agent Transport Simulation) software project was started around 2006 with the goal of generating traffic and congestion patterns by following individual synthetic travelers through their daily or weekly activity programme. It has since then evolved from a collection of stand-alone C++ programs to an integrated Java-based framework which is publicly hosted, open-source available, automatically regression tested. It is currently used by about 40 groups throughout the world. This book takes stock of the current status. The first part of the book gives an introduction to the most important concepts, with the intention of enabling a potential user to set up and run basic simulations.The second part of the book describes how the basic functionality can be extended, for example by adding schedule-based public transit, electric or autonomous cars, paratransit, or within-day replanning. For each extension, the text provides pointers to the additional documentation and to the code base. It is also discussed how people with appropriate Java programming skills can write their own extensions, and plug them into the MATSim core.
The project has started from the basic idea that traffic is a consequence of human behavior, and thus humans and their behavior should be the starting point of all modelling, and with the intuition that when simulations with 100 million particles are possible in computational physics, then behavior-oriented simulations with 10 million travelers should be possible in travel behavior research. The initial implementations thus combined concepts from computational physics and complex adaptive systems with concepts from travel behavior research. The third part of the book looks at theoretical concepts that are able to describe important aspects of the simulation system; for example, under certain conditions the code becomes a Monte Carlo engine sampling from a discrete choice model. Another important aspect is the interpretation of the MATSim score as utility in the microeconomic sense, opening up a connection to benefit cost analysis.
Finally, the book collects use cases as they have been undertaken with MATSim. All current users of MATSim were invited to submit their work, and many followed with sometimes crisp and short and sometimes longer contributions, always with pointers to additional references.
We hope that the book will become an invitation to explore, to build and to extend agent-based modeling of travel behavior from the stable and well tested core of MATSim documented here.
Evolutionary genomics : statistical and computational methods
This open access book addresses the challenge of analyzing and understanding the evolutionary dynamics of complex biological systems at the genomic level, and elaborates on some promising strategies that would bring us closer to uncovering of the vital relationships between genotype and phenotype. After a few educational primers, the book continues with sections on sequence homology and alignment, phylogenetic methods to study genome evolution, methodologies for evaluating selective pressures on genomic sequences as well as genomic evolution in light of protein domain architecture and transposable elements, population genomics and other omics, and discussions of current bottlenecks in handling and analyzing genomic data. Written for the highly successful Methods in Molecular Biology series, chapters include the kind of detail and expert implementation advice that lead to the best results. Authoritative and comprehensive, Evolutionary Genomics: Statistical and Computational Methods, Second Edition aims to serve both novices in biology with strong statistics and computational skills, and molecular biologists with a good grasp of standard mathematical concepts, in moving this important field of study forward
Evolutionary Genomics
This open access book addresses the challenge of analyzing and understanding the evolutionary dynamics of complex biological systems at the genomic level, and elaborates on some promising strategies that would bring us closer to uncovering of the vital relationships between genotype and phenotype. After a few educational primers, the book continues with sections on sequence homology and alignment, phylogenetic methods to study genome evolution, methodologies for evaluating selective pressures on genomic sequences as well as genomic evolution in light of protein domain architecture and transposable elements, population genomics and other omics, and discussions of current bottlenecks in handling and analyzing genomic data. Written for the highly successful Methods in Molecular Biology series, chapters include the kind of detail and expert implementation advice that lead to the best results. Authoritative and comprehensive, Evolutionary Genomics: Statistical and Computational Methods, Second Edition aims to serve both novices in biology with strong statistics and computational skills, and molecular biologists with a good grasp of standard mathematical concepts, in moving this important field of study forward
13th International Conference on Modeling, Optimization and Simulation - MOSIM 2020
ComitĂ© dâorganisation: UniversitĂ© Internationale dâAgadir â Agadir (Maroc) Laboratoire Conception Fabrication Commande â Metz (France)Session RS-1 âSimulation et Optimisationâ / âSimulation and Optimizationâ Session RS-2 âPlanification des Besoins MatiĂšres PilotĂ©e par la Demandeâ / âDemand-Driven Material Requirements Planningâ Session RS-3 âIngĂ©nierie de SystĂšmes BasĂ©es sur les ModĂšlesâ / âModel-Based System Engineeringâ Session RS-4 âRecherche OpĂ©rationnelle en Gestion de Productionâ / "Operations Research in Production Management" Session RS-5 "Planification des MatiĂšres et des Ressources / Planification de la Productionâ / âMaterial and Resource Planning / Production Planning" Session RS-6 âMaintenance Industrielleâ / âIndustrial Maintenanceâ Session RS-7 "Etudes de Cas Industrielsâ / âIndustrial Case Studies" Session RS-8 "DonnĂ©es de Masse / Analyse de DonnĂ©esâ / âBig Data / Data Analytics" Session RS-9 "Gestion des SystĂšmes de Transportâ / âTransportation System Management" Session RS-10 "Economie Circulaire / DĂ©veloppement Durable" / "Circular Economie / Sustainable Development" Session RS-11 "Conception et Gestion des ChaĂźnes Logistiquesâ / âSupply Chain Design and Management" Session SP-1 âIntelligence Artificielle & Analyse de DonnĂ©es pour la Production 4.0â / âArtificial Intelligence & Data Analytics in Manufacturing 4.0â Session SP-2 âGestion des Risques en Logistiqueâ / âRisk Management in Logisticsâ Session SP-3 âGestion des Risques et Evaluation de Performanceâ / âRisk Management and Performance Assessmentâ Session SP-4 "Indicateurs ClĂ©s de Performance 4.0 et Dynamique de Prise de DĂ©cisionâ / â4.0 Key Performance Indicators and Decision-Making Dynamics" Session SP-5 "Logistique Maritimeâ / âMarine Logistics" Session SP-6 âTerritoire et Logistique : Un SystĂšme Complexeâ / âTerritory and Logistics: A Complex Systemâ Session SP-7 "Nouvelles AvancĂ©es et Applications de la Logique Floue en Production Durable et en Logistiqueâ / âRecent Advances and Fuzzy-Logic Applications in Sustainable Manufacturing and Logistics" Session SP-8 âGestion des Soins de SantĂ©â / âHealth Care Managementâ Session SP-9 âIngĂ©nierie Organisationnelle et Gestion de la ContinuitĂ© de Service des SystĂšmes de SantĂ© dans lâEre de la Transformation NumĂ©rique de la SociĂ©tĂ©â / âOrganizational Engineering and Management of Business Continuity of Healthcare Systems in the Era of Numerical Society Transformationâ Session SP-10 âPlanification et Commande de la Production pour lâIndustrie 4.0â / âProduction Planning and Control for Industry 4.0â Session SP-11 âOptimisation des SystĂšmes de Production dans le Contexte 4.0 Utilisant lâAmĂ©lioration Continueâ / âProduction System Optimization in 4.0 Context Using Continuous Improvementâ Session SP-12 âDĂ©fis pour la Conception des SystĂšmes de Production Cyber-Physiquesâ / âChallenges for the Design of Cyber Physical Production Systemsâ Session SP-13 âProduction AvisĂ©e et DĂ©veloppement Durableâ / âSmart Manufacturing and Sustainable Developmentâ Session SP-14 âLâHumain dans lâUsine du Futurâ / âHuman in the Factory of the Futureâ Session SP-15 âOrdonnancement et PrĂ©vision de ChaĂźnes Logistiques RĂ©silientesâ / âScheduling and Forecasting for Resilient Supply Chains