Academic literature on the topic 'Discrete network design'
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Journal articles on the topic "Discrete network design"
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Chen, Qun, and Feng Shi. "Model for Microcirculation Transportation Network Design." Mathematical Problems in Engineering 2012 (2012): 1–11. http://dx.doi.org/10.1155/2012/379867.
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The idea of microcirculation transportation was proposed to shunt heavy traffic on arterial roads through branch roads. The optimization model for designing micro-circulation transportation network was developed to pick out branch roads as traffic-shunting channels and determine their required capacity, trying to minimize the total reconstruction expense and land occupancy subject to saturation and reconstruction space constraints, while accounting for the route choice behaviour of network users. Since micro-circulation transportation network design problem includes both discrete and continuous variables, a discretization method was developed to convert two groups of variables (discrete variables and continuous variables) into one group of new discrete variables, transforming the mixed network design problem into a new kind of discrete network design problem with multiple values. The genetic algorithm was proposed to solve the new discrete network design problem. Finally a numerical example demonstrated the efficiency of the model and algorithm.
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Wang, Yang, Jin Xin Cao, Xia Xi Li, and Ri Dong Wang. "Time-Dependent Discrete Transportation Network Design." Applied Mechanics and Materials 505-506 (January 2014): 533–36. http://dx.doi.org/10.4028/www.scientific.net/amm.505-506.533.
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The transportation network construction takes place over a quite long time span and need enough budget. The budget is from the allocation of funds in phases and the construction cost change in the process of the construction. The general static transportation network design problems ignores the problems above. So the optimal solution obtained by the static model is best in short time, and it is may be unfeasible in the actual situation. Based on the actual situation and the shortage of the static model, the time-dependent transport network design is proposed in this study. The plan horizon is divided into N intervals and a bi-level model is built to describe the problem. The objective of the upper-level is to minimize the total cost of the whole stages. the lower-level model is a user equilibrium model. Then the branch and bound (B-B) algorithm is designed to solve the model. It is obvious that the solution of the time-dependent simulation model is more feasible than the solution of the static sequential design.
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Xie, Chi. "Bicriterion discrete equilibrium network design problem." Networks 63, no. 4 (2014): 286–305. http://dx.doi.org/10.1002/net.21546.
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Juan, Wu, Lu Huapu, Yu Xinxin, and Bian Changzhi. "Genetic Algorithm for Multiuser Discrete Network Design Problem under Demand Uncertainty." Mathematical Problems in Engineering 2012 (2012): 1–17. http://dx.doi.org/10.1155/2012/686272.
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Discrete network design is an important part of urban transportation planning. The purpose of this paper is to present a bilevel model for discrete network design. The upper-level model aims to minimize the total travel time under a stochastic demand to design a discrete network. In the lower-level model, demands are assigned to the network through a multiuser traffic equilibrium assignment. Generally, discrete network could affect path selections of demands, while the results of the multiuser traffic equilibrium assignment need to reconstruct a new discrete network. An iterative approach including an improved genetic algorithm and Frank-Wolfe algorithm is used to solve the bi-level model. The numerical results on Nguyen Dupuis network show that the model and the related algorithms were effective for discrete network design.
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O’brien, Liam, and Szeto Wai Yuen. "The Discrete Network Design Problem Over Time." HKIE Transactions 14, no. 4 (2007): 47–55. http://dx.doi.org/10.1080/1023697x.2007.10668097.
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Belotti, P., F. Malucelli, and L. Brunetta. "Multicommodity network design with discrete node costs." Networks 49, no. 1 (2006): 90–99. http://dx.doi.org/10.1002/net.20144.
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Miandoabchi, Elnaz, Farzaneh Daneshzand, W. Y. Szeto, and Reza Zanjirani Farahani. "Multi-objective discrete urban road network design." Computers & Operations Research 40, no. 10 (2013): 2429–49. http://dx.doi.org/10.1016/j.cor.2013.03.016.
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Zhou, Yaling, Chengxuan Cao, and Ziyan Feng. "Optimization of Multimodal Discrete Network Design Problems Based on Super Networks." Applied Sciences 11, no. 21 (2021): 10143. http://dx.doi.org/10.3390/app112110143.
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In this paper, we investigate the multimodal discrete network design problem that simultaneously optimizes the car, bus, and rail transit network, in which inter-modal transfers are achieved by slow traffic modes including walking and bike-sharing. Specifically, a super network topology is presented to signify the modal interactions. Then, the generalized cost formulas of each type of links in the super network are defined. And based on the above formulas a bi-objective programming model is proposed to minimize the network operation cost and construction cost with traffic flow equilibrium constraints, investment constraints and expansion constraints. Moreover, a hybrid heuristic algorithm that combines the minimum cost flow algorithm and simulated annealing algorithm is presented to solve the proposed model. Finally, the effectiveness of the proposed model and algorithm is evaluated through two numerical tests: a simple test network and an actual multimodal transport network.
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Yin, Ruyang, Jiping Xing, Pengli Mo, Nan Zheng, and Zhiyuan Liu. "BO-B&B: A hybrid algorithm based on Bayesian optimization and branch-and-bound for discrete network design problems." Electronic Research Archive 30, no. 11 (2022): 3993–4014. http://dx.doi.org/10.3934/era.2022203.
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<abstract> <p>A discrete network design problem (DNDP) is conventionally formulated as an analytical bi-level programming problem to acquire an optimal network design strategy for an existing traffic network. In recent years, multimodal network design problems have benefited from simulation-based models. The nonconvexity and implicity of bi-level DNDPs make it challenging to obtain an optimal solution, especially for simulation-related models. Bayesian optimization (BO) has been proven to be an effective method for optimizing the costly black-box functions of simulation-based continuous network design problems. However, there are only discrete inputs in DNDPs, which cannot be processed using standard BO algorithms. To address this issue, we develop a hybrid method (BO-B&amp;B) that combines Bayesian optimization and a branch-and-bound algorithm to deal with discrete variables. The proposed algorithm exploits the advantages of the cutting-edge machine-learning parameter-tuning technique and the exact mathematical optimization method, thereby balancing efficiency and accuracy. Our experimental results show that the proposed method outperforms benchmarking discrete optimization heuristics for simulation-based DNDPs in terms of total computational time. Thus, BO-B&amp;B can potentially aid decision makers in mapping practical network design schemes for large-scale networks.</p> </abstract>
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Hu, Guojing, Weike Lu, Feng Wang, and Robert W. Whalin. "Macroscopic Fundamental Diagram Based Discrete Transportation Network Design." Journal of Advanced Transportation 2020 (January 20, 2020): 1–13. http://dx.doi.org/10.1155/2020/4951953.
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The presence of demand uncertainty brings challenges to network design problems (NDP), because fluctuations in origin-destination (OD) demand have a prominent effect on the corresponding total travel time, which is usually adopted as an index to evaluate the network design problem. Fortunately, the macroscopic fundamental diagram (MFD) has been proved to be a property of the road network itself, independent of the origin-destination demand. Such characteristics of an MFD provide a new theoretical basis to assess the traffic network performance and further appraise the quality of network design strategies. Focusing on improving network capacity under the NDP framework, this paper formulates a bi-level programming model, where at the lower level, flows are assigned to the newly extended network subject to user equilibrium theory, and the upper level determines which links should be added to achieve the maximum network capacity. To solve the proposed model, we design an algorithm framework, where traffic flow distribution of each building strategy is calculated under the dynamic user equilibrium (DUE), and updated through the VISSIM-COM-Python interaction. Then, the output data are obtained to shape MFDs, and k-means clustering algorithm is employed to quantify the MFD-based network capacity. Finally, the methodology is implemented in a test network, and the results show the benefits of using the MFD-based method to solve the network design problem under stochastic OD demands. Specifically, the capacity paradox is also presented in the test results.
Dissertations / Theses on the topic "Discrete network design"
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ALOISE, DANIEL. "HEURISTICS FOR THE NETWORK DESIGN PROBLEM WITH DISCRETE COST FUNCTIONS." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2005. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=6665@1.
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COORDENAÇÃO DE APERFEIÇOAMENTO DO PESSOAL DE ENSINO SUPERIOR<br>Problemas de multifluxos surgem como modelos básicos no
contexto de várias aplicações de fluxos em redes, tais
como redes de telecomunicações, redes de transporte e
logística. Em tais aplicações, os fluxos que atravessam a
rede compartilham simultaneamente os mesmos recursos
disponíveis e são definidos por suas próprias restrições.
A cada uma das arestas ligando os pontos da rede está
associado um custo, fixo ou proporcional à sua utilização.
Este trabalho trata problemas de projeto de redes
multifluxos, em que os custos estão associados às
capacidades instaladas nas arestas. Particularmente, será
estudado o caso em que a função de custo nas arestas
possui o comportamento de uma função escada crescente e
descontínua, para o qual métodos exatos de resolução são
ineficientes. Métodos heurísticos são propostos para a
resolução aproximada do problema e sintetizados em um
algoritmo de multi-partida com memória adaptativa. Um
mecanismo de intensificação, conhecido na literatura como
construção de vocabulário, é também explorado e aplicado.
Finalmente, experimentos computacionais são realizados e o
método de resolução proposto é analisado quanto aos seus
resultados e os resultados obtidos pelo método de
resolução proposto são analisados. O método obtém as
melhores soluções conhecidas para algumas instâncias da
literatura.<br>Multicommodity flow problems arise widely as basic models
in the context of network flows applications such as
telecommunication networks, transportation problems, and
logistic. In these applicatons, the flows that cross the
networks share the same avaiable resources simultaneously
and are defined by their own constraints. Each edge
connecting two nodes in the network has an associated cost
that is either fixed or proportional to its use. This work
focuses on a network design problem in which the cost are
associated with the capacities installed in the edges.
Particularly, the network design problem studied has
discrete and step increasing cost functions on the edges,
for which exact methods are inefficient. Heuristics are
proposed for the approximate memory algorithm. An
intensification mechanism, known in the literature as
vocabulary building, is also explored and applied.
Finally, computational experiments are performed and the
results obtained with the proposed solution method are
evaluated. The method obtains the best known solutions for
some instances in the literature.
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Ford, Neil Thomas. "Discrete fracture network modelling for the use in block cave design and assessment." Thesis, University of Exeter, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.489226.
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Block caving is becoming an increasingly important mining method for rock masses which were previously considered to be too strong, at greater than usual depth or as an extension of open pit mining. The behaviour of the rock mass is affected by the strength of the intact rock, the orientation, continuity, spacing and strength of the discontinuities and the in-situ stress. Within a specific rock mass targeted for block caving there may be several different geotechnical domains with different characteristics.
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Tieves, Martin [Verfasser], Arie Marinus [Akademischer Betreuer] Koster, and Edoardo [Akademischer Betreuer] Amaldi. "Discrete and robust optimization approaches to network design with compression and virtual network embedding / Martin Tieves ; Arie Marinus Koster, Edoardo Amaldi." Aachen : Universitätsbibliothek der RWTH Aachen, 2016. http://d-nb.info/1130871932/34.
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Naumann, Roman. "Wireless Networking in Future Factories: Protocol Design and Evaluation Strategies." Doctoral thesis, Humboldt-Universität zu Berlin, 2020. http://dx.doi.org/10.18452/21013.
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Industrie-4.0 bringt eine wachsende Nachfrage an Netzwerkprotokollen mit sich, die es erlauben, Informationen vom Produktionsprozess einzelner Maschinen zu erfassen und verfügbar zu machen. Drahtlose Übertragung erfüllt hierbei die für industrielle Anwendungen benötigte Flexibilität, kann in herausfordernden Industrieumgebungen aber nicht immer zeitnahe und zuverlässige Übertragung gewährleisten. Die Beiträge dieser Arbeit behandeln schwerpunktmäßig Protokollentwurf und Protokollevaluation für industrielle Anwendungsfälle. Zunächst identifizieren wir Anforderungen für den industriellen Anwendungsfall und leiten daraus konkrete Entwufskriterien ab, die Protokolle erfüllen sollten. Anschließend schlagen wir Protokollmechanismen vor, die jene Entwurfskriterien für unterschiedliche Arten von Protokollen umsetzen, und die in verschiedenem Maße kompatibel zu existierenden Netzwerken und existierender Hardware sind: Wir zeigen, wie anwendungsfallspezifische Priorisierung von Netzwerkdaten dabei hilft, zuverlässige Übertragung auch unter starken Störeinflüssen zu gewährleisten, indem zunächst eine akkurate Vorschau von Prozessinformationen übertragen wird. Für deren Fehler leiten wir präziser Schranken her. Ferner zeigen wir, dass die Fairness zwischen einzelnen Maschinen durch Veränderung von Warteschlangen verbessert werden kann, wobei hier ein Teil der Algorithmen von Knoten innerhalb des Netzwerks durchgeführt wird. Ferner zeigen wir, wie Network-Coding zu unserem Anwendungsfall beitragen kann, indem wir spezialisierte Kodierungs- und Dekodierungsverfahren einführen. Zuletzt stellen wir eine neuartige Softwarearchitektur und Evaluationstechnik vor, die es erlaubt, potentiell proprietäre Protokollimplementierungen innerhalb moderner diskreter Ereignissimulatoren zu verwenden. Wir zeigen, dass unser vorgeschlagener Ansatz ausreichend performant für praktische Anwendungen ist und, darüber hinaus, die Validität von Evaluationsergebnissen gegenüber existierenden Ansätzen verbessert.<br>As smart factory trends gain momentum, there is a growing need for robust information transmission protocols that make available sensor information gathered by individual machines. Wireless transmission provides the required flexibility for industry adoption but poses challenges for timely and reliable information delivery in challenging industrial environments. This work focuses on to protocol design and evaluation aspects for industrial applications. We first introduce the industrial use case, identify requirements and derive concrete design principles that protocols should implement. We then propose mechanisms that implement these principles for different types of protocols, which retain compatibility with existing networks and hardware to varying degrees: we show that use-case tailored prioritization at the source is a powerful tool to implement robustness against challenged connectivity by conveying an accurate preview of information from the production process. We also derive precise bounds for the quality of that preview. Moving parts of the computational work into the network, we show that reordering queues in accordance with our prioritization scheme improves fairness among machines. We also demonstrate that network coding can benefit our use case by introducing specialized encoding and decoding mechanisms. Last, we propose a novel architecture and evaluation techniques that allows incorporating possibly proprietary networking protocol implementations with modern discrete event network simulators, rendering, among others, the adaption of protocols to specific industrial use cases more cost efficient. We demonstrate that our approach provides sufficient performance and improves the validity of evaluation results over the state of the art.
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Zuo, Jian. "The Frequency Monitor Network (FNET) Design and Situation Awareness Algorithm Development." Diss., Virginia Tech, 2008. http://hdl.handle.net/10919/26721.
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Wide Area Measurements (WAMs) have been widely used in the energy management system (EMS) of power system for monitoring, operation and control. In recent years, the advent of synchronized Phasor Measurements Unit (PMU) has added another dimension to the field of wide-area measurement. However, the high cost of the PMU, which includes the manufacture and deployment fee, is a hurdle to the wide use of the PMU in power systems. Unlike traditional PMUs, the frequency monitoring network (FNET) developed by the Virginia Tech Power IT lab is an Internetâ based, GPSâ synchronized, wide-area frequency monitoring network deployed at the distribution level, providing a low-cost and easily deployable WAMs solution. In this dissertation, the research work can be categorized into two parts: FNET Design and Situation Awareness Algorithm Development.<br>Ph. D.
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Middlebrooks, Sam E. "The COMPASS Paradigm For The Systematic Evaluation Of U.S. Army Command And Control Systems Using Neural Network And Discrete Event Computer Simulation." Diss., Virginia Tech, 2003. http://hdl.handle.net/10919/26605.
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In todayâ s technology based society the rapid proliferation of new machines and systems that would have been undreamed of only a few short years ago has become a way of life. Developments and advances especially in the areas of digital electronics and micro-circuitry have spawned subsequent technology based improvements in transportation, communications, entertainment, automation, the armed forces, and many other areas that would not have been possible otherwise. This rapid â explosionâ of new capabilities and ways of performing tasks has been motivated as often as not by the philosophy that if it is possible to make something better or work faster or be more cost effective or operate over greater distances then it must inherently be good for the human operator. Taken further, these improvements typically are envisioned to consequently produce a more efficient operating system where the human operator is an integral component. The formal concept of human-system interface design has only emerged this century as a recognized academic discipline, however, the practice of developing ideas and concepts for systems containing human operators has been in existence since humans started experiencing cognitive thought.
An example of a human system interface technology for communication and dissemination of written information that has evolved over centuries of trial and error development, is the book. It is no accident that the form and shape of the book of today is as it is. This is because it is a shape and form readily usable by human physiology whose optimal configuration was determined by centuries of effort and revision. This slow evolution was mirrored by a rate of technical evolution in printing and elsewhere that allowed new advances to be experimented with as part of the overall use requirement and need for the existence of the printed word and some way to contain it. Today, however, technology is advancing at such a rapid rate that evolutionary use requirements have no chance to develop along side the fast pace of technical progress. One result of this recognition is the establishment of disciplines like human factors engineering that have stated purposes and goals of systematic determination of good and bad human system interface designs. However, other results of this phenomenon are systems that get developed and placed into public use simply because new technology allowed them to be made. This development can proceed without a full appreciation of how the system might be used and, perhaps even more significantly, what impact the use of this new system might have on the operator within it.
The U.S. Army has a term for this type of activity. It is called â stove-piped developmentâ . The implication of this term is that a system gets developed in isolation where the developers are only looking â upâ and not â aroundâ . They are thus concerned only with how this system may work or be used for its own singular purposes as opposed to how it might be used in the larger community of existing systems and interfaces or, even more importantly, in the larger community of other new systems in concurrent development. Some of the impacts for the Army from this mode of system development are communication systems that work exactly as designed but are unable to interface to other communications systems in other domains for battlefield wide communications capabilities. Having communications systems that cannot communicate with each other is a distinct problem in its own right. However, when developments in one industry produce products that humans use or attempt to use with products from totally separate developments or industries, the Army concept of product development resulting from stove-piped design visions can have significant implication on the operation of each system and the human operator attempting to use it.
There are many examples that would illustrate the above concept, however, one that will be explored here is the Army effort to study, understand, and optimize its command and control (C2) operations. This effort is at the heart of a change in the operational paradigm in C2 Tactical Operations Centers (TOCs) that the Army is now undergoing. For the 50 years since World War II the nature, organization, and mode of the operation of command organizations within the Army has remained virtually unchanged. Staffs have been organized on a basic four section structure and TOCs generally only operate in a totally static mode with the amount of time required to move them to keep up with a mobile battlefield going up almost exponentially from lower to higher command levels. However, current initiatives are changing all that and while new vehicles and hardware systems address individual components of the command structures to improve their operations, these initiatives do not necessarily provide the environment in which the human operator component of the overall system can function in a more effective manner.
This dissertation examines C2 from a system level viewpoint using a new paradigm for systematically examining the way TOCs operate and then translating those observations into validated computer simulations using a methodological framework. This paradigm is called COmputer Modeling Paradigm And Simulation of Systems (COMPASS). COMPASS provides the ability to model TOC operations in a way that not only includes the individuals, work groups and teams in it, but also all of the other hardware and software systems and subsystems and human-system interfaces that comprise it as well as the facilities and environmental conditions that surround it.
Most of the current literature and research in this area focuses on the concept of C2 itself and its follow-on activities of command, control, communications (C3), command, control, communications, and computers (C4), and command, control, communications, computers and intelligence (C4I). This focus tends to address the activities involved with the human processes within the overall system such as individual and team performance and the commanderâ s decision-making process. While the literature acknowledges the existence of the command and control system (C2S), little effort has been expended to quantify and analyze C2Ss from a systemic viewpoint. A C2S is defined as the facilities, equipment, communications, procedures, and personnel necessary to support the commander (i.e., the primary decision maker within the system) for conducting the activities of planning, directing, and controlling the battlefield within the sector of operations applicable to the system.
The research in this dissertation is in two phases. The overall project incorporates sequential experimentation procedures that build on successive TOC observation events to generate an evolving data store that supports the two phases of the project. Phase I consists of the observation of heavy maneuver battalion and brigade TOCs during peacetime exercises. The term â heavy maneuverâ is used to connotate main battle forces such as armored and mechanized infantry units supported by artillery, air defense, close air, engineer, and other so called combat support elements. This type of unit comprises the main battle forces on the battlefield. It is used to refer to what is called the conventional force structure. These observations are conducted using naturalistic observation techniques of the visible functioning of activities within the TOC and are augmented by automatic data collection of such things as analog and digital message traffic, combat reports generated by the computer simulations supporting the wargame exercise, and video and audio recordings where appropriate and available. Visible activities within the TOC include primarily the human operator functions such as message handling activities, decision-making processes and timing, coordination activities, and span of control over the battlefield. They also include environmental conditions, functional status of computer and communications systems, and levels of message traffic flows. These observations are further augmented by observer estimations of such indicators as perceived level of stress, excitement, and level of attention to the mission of the TOC personnel. In other words, every visible and available component of the C2S within the TOC is recorded for analysis. No a priori attempt is made to evaluate the potential significance of each of the activities as their contribution may be so subtle as to only be ascertainable through statistical analysis. Each of these performance activities becomes an independent variable (IV) within the data that is compared against dependent variables (DV) identified according to the mission functions of the TOC. The DVs for the C2S are performance measures that are critical combat tasks performed by the system. Examples of critical combat tasks are â attacking to seize an objectiveâ , â seizure of key terrainâ , and â river crossingsâ . A list of expected critical combat tasks has been prepared from the literature and subject matter expert (SME) input. After the exercise is over, the success of these critical tasks attempted by the C2S during the wargame are established through evaluator assessments, if available, and/or TOC staff self analysis and reporting as presented during after action reviews.
The second part of Phase I includes datamining procedures, including neural networks, used in a constrained format to analyze the data. The term constrained means that the identification of the outputs/DV is known. The process was to identify those IV that significantly contribute to the constrained DV. A neural network is then constructed where each IV forms an input node and each DV forms an output node. One layer of hidden nodes is used to complete the network. The number of hidden nodes and layers is determined through iterative analysis of the network. The completed network is then trained to replicate the output conditions through iterative epoch executions. The network is then pruned to remove input nodes that do not contribute significantly to the output condition. Once the neural network tree is pruned through iterative executions of the neural network, the resulting branches are used to develop algorithmic descriptors of the system in the form of regression like expressions.
For Phase II these algorithmic expressions are incorporated into the CoHOST discrete event computer simulation model of the C2S. The programming environment is the commercial programming language Micro Saintä running on a PC microcomputer. An interrogation approach was developed to query these algorithms within the computer simulation to determine if they allow the simulation to reflect the activities observed in the real TOC to within an acceptable degree of accuracy.
The purpose of this dissertation is to introduce the COMPASS concept that is a paradigm for developing techniques and procedures to translate as much of the performance of the entire TOC system as possible to an existing computer simulation that would be suitable for analyses of future system configurations.
The approach consists of the following steps:
· Naturalistic observation of the real system using ethnographic techniques.
· Data analysis using datamining techniques such as neural networks.
· Development of mathematical models of TOC performance activities.
· Integration of the mathematical into the CoHOST computer simulation.
· Interrogation of the computer simulation.
· Assessment of the level of accuracy of the computer simulation.
· Validation of the process as a viable system simulation approach.<br>Ph. D.
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Furió, Pruñonosa Salvador. "Modelos y métodos avanzados para la logística del contenedor. Aplicación al Puerto de Valencia." Doctoral thesis, Universitat Politècnica de València, 2016. http://hdl.handle.net/10251/63248.
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[EN] Since its birth in the fifties, the maritime container has revolutionised freight international transport providing support to a global production system, marked by the industry offshoring looking for competitive advantages and the configuration of increasingly complex and global supply chains. Within this context, the container has gained a great importance becoming a basic logistic element in supply chains where it plays the role of a transport, production and distribution unit.
The success of container is evident if we analyse the evolution of container port traffic, which has been growing at a pace of over 10 % surpassing 600 million TEU of traffic since 2012.
The container is, therefore, a key element in global supply chains and container logistics is a field of work and study of enormous interest due to its impact in the efficiency of these supply chains, due to the cost incurred for the operating account of shipping companies and operators (cost which is transferred to the final user and has an impact in the price of the goods being transported), and due to the social and environmental cost associated to the externalities of transport derived from the management of the container fleet.
Container logistics has to do with the efficient management of the container fleet, minimising the transport, warehousing and maintenance costs, and maximising the use of the equipment. In container logistics it is possible to categorise, generally, two different categories or levels depending on the geographical scope and the transport modes involved: The international level and the local or regional level.
This thesis addresses container logistics at a local or regional level, insofar as in relation to the management of stock, transport and internal movements, trying to react and identify solutions to some of the problems currently facing the port-logistics sector.
The research result allows, firstly, knowing in an integral and structured manner the complexity of maritime container logistics. Secondly, specific real problems are identified and addressed for its modelling and analysis that allows for contributing to the improvement of the current logistics system. The following specific problems are addressed:
-Modal choice problems for the configuration of internal logistics corridors or chains for maritime container transport.
-Problems locating networks of nodal infrastructures facilitating the logistics needs of maritime containers.
-Problems related to the movements and management of empty maritime containers.
The interest and the academic contribution of this thesis lies as much in the definition and modelling of the specific problems with a significant theoretical discussion, as the empirical application to a real environment and real situations. This has been possible due to the direct contact of the author with the port-logistics sector and the participation in many consultancy and research projects in the cluster of the port of Valencia and also at European and international level.
The thesis is outlined as a collection of six scientific articles. The articles have been presented in the thesis in such a way as to follow a logical sequence and not in relation with the chronological order of their publication.<br>[ES] Desde su aparición en los años 50, el contenedor marítimo ha revoluciona-do el transporte internacional de mercancías dando soporte a un sistema global de producción, marcado por la multilocalización de las industrias en busca de ventajas competitivas y la configuración de cadenas de suministro cada vez más complejas y globales. En este contexto, el contenedor ha adquirido un gran protagonismo convirtiéndose en un elemento logístico básico en las cadenas de suministro en las que actúa como unidad de transporte, producción y distribución.
El éxito del contenedor queda puesto de manifiesto al analizar la evolución del tráfico portuario de contenedores, que ha estado creciendo a ritmos superiores al 10 %, superando los 600 millones TEU desde 2012.
El contenedor es, por tanto, un elemento clave de las cadenas de suministro globales y la logística del contenedor es un área de estudio y trabajo de enorme interés por el impacto que tiene en la eficiencia de dichas cadenas, por el coste que supone a navieras y operadores en sus cuentas de explotación (coste que se traslada al usuario final y repercute en el precio de las mercancías transportadas) y por el coste social y ambiental asociado a las externalidades del transporte derivadas de esta gestión de la flota de contenedores.
La logística del contenedor tiene que ver con la gestión eficiente del parque de contenedores, minimizando los costes de transporte, almacenamiento y mantenimiento, y maximizando la utilización del equipo. En la logística del contenedor se pueden identificar, por lo general, dos categorías o niveles diferenciados en función del ámbito geográfico y de los modos de transporte implicados: El nivel internacional y el nivel local o regional.
Este trabajo aborda la logística del contenedor a nivel regional o local, es decir, en lo relativo a la gestión del stock, transporte y movimientos interiores, tratando de dar respuesta y plantear soluciones a algunos de los problemas con los que se encuentra el sector logístico-portuario en la actualidad.
El resultado de la investigación permite, en primer lugar, conocer de una forma integral y estructurada la complejidad de la logística del contenedor marítimo. En segundo lugar, se identifican y abordan problemas específicos reales para su modelización y análisis, que permiten contribuir a la mejora del sistema logístico actual. En concreto se abordan los siguientes problemas:
-Problemas de elección modal en la configuración de las cadenas o corredores logísticos interiores en el transporte de contenedores marítimos.
-Problemas de localización o vertebración de una red de infraestructuras nodales para atender las necesidades logísticas de los contenedores marítimos.
-Problemas asociados a los movimientos en vacío y gestión de contenedores marítimos.
El interés y contribución académica de este trabajo reside tanto en la definición y modelización de los problemas específicos con una profunda discusión teórica, como en la aplicación empírica a situaciones y entornos reales, cosa que ha sido posible gracias al contacto directo del autor con el sector logístico-portuario y su participación en numerosos proyectos de consulto-ría e investigación tanto en el clúster del Puerto de Valencia como a nivel europeo e internacional.
El trabajo se plantea como una colección de seis artículos científicos. El orden en que están situados los artículos en la tesis permite mantener una secuencia lógica construida a posteriori y no según el orden cronológico en el que fueron publicados.<br>[CAT] Des del seu naixement als anys 50, el contenidor marítim ha revolucionat el transport internacional de mercaderies donant suport a un sistema global de producció, marcat per la multilocalització de les indústries en busca d'avantatges competitives i la configuració de cadenes de subministrament cada vegada més complexes i globals. En aquest context, el contenidor ha adquirit un gran protagonisme convertintse en un element logístic bàsic en les cadenes de subministrament en les quals actua com a unitat de transport, producció i distribució.
L'èxit del contenidor s'evidencia en analitzar l'evolució del tràfic portuari de contenidors, que ha estat creixent a ritmes superiors al 10 % superant els 600 milions TEU des de 2012.
El contenidor és, per tant, un element clau de les cadenes subministrament globals i la logística del contenidor és un àrea d'estudi i treball d'enorme interès per l'impacte que té en l'eficiència d'aquestes cadenes, pel cost que suposa a navilieres i operadors en els seus comptes d'explotació (cost que es trasllada a l'usuari final i repercuteix en el preu de les mercaderies transportades) i pel cost social i ambiental associat a les externalitats del transport derivades d'aquesta gestió de la flota de contenidors.
La logística del contenidor té a veure amb la gestió eficient del parc de contenidors, minimitzant els costos de transport, emmagatzematge i manteniment, i maximitzant la utilització de l'equip. En la logística del contenidor es poden identificar, en general, dues categories o nivells diferenciats en funció de l'àmbit geogràfic i de les modalitats de transport implicats: el nivell internacional i el nivell local o regional.
Aquest treball aborda la logística del contenidor a nivell regional o local, és a dir, quant a la gestió de l'estoc, transport i moviments interiors, tractant de donar resposta i plantejar solucions a alguns dels problemes amb els quals es troba el sector logístic-portuari en l'actualitat.
El resultat de la recerca permet, en primer lloc, conèixer d'una forma integral i estructurada la complexitat de la logística del contenidor marítim. En segon lloc, s'identifiquen i aborden problemes específics reals per a la seua modelització i anàlisi, que permeten contribuir a la millora del sistema logístic actual. En concret s'aborden els següents problemes:
-Problemes d'elecció modal en la configuració de les cadenes o corredors logístics interiors en el transport de contenidors marítims.
-Problemes de localització o vertebració d'una xarxa d'infraestructures nodals per a atendre les necessitats logístiques dels contenidors marítims.
-Problemes associats als moviments en buit i gestió de contenidors marítims.
L'interès i contribució acadèmica d'aquest treball resideix tant en la definició i modelització dels problemes específics amb una profunda discussió teòrica, com en l'aplicació empírica a situacions i entorns reals, cosa que ha sigut possible gràcies al contacte directe de l'autor amb el sector logístic-portuari i la seua participació en nombrosos projectes de consultoria i recerca tant en el clúster del Port de València com a nivell europeu i internacional.
El treball es planteja com una col·lecció de sis articles científics. L'ordre en què estan situats els articles en la tesi permet mantenir una seqüència lògica construïda a posteriori i no segons l'ordre cronològic en el qual van ser publicats.<br>Furió Pruñonosa, S. (2016). Modelos y métodos avanzados para la logística del contenedor. Aplicación al Puerto de Valencia [Tesis doctoral no publicada]. Universitat Politècnica de València. https://doi.org/10.4995/Thesis/10251/63248<br>TESIS
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Camorim, José Eduardo Vieira. "Estudo comparativo das aproximações baseadas no método de decomposição paramétrico para avaliar redes de filas de manufatura utilizando planejamento de experimentos." Universidade Federal de São Carlos, 2008. https://repositorio.ufscar.br/handle/ufscar/3573.
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Previous issue date: 2008-02-29<br>Universidade Federal de Minas Gerais<br>This is a study of approximations based on parametric decomposition methods
used in open queueing networks for modeling discrete job-shop manufacturing systems. These
approximations play an important role in evaluating the performance of productive systems and
have proved effective in many situations. Besides, these approximations are relatively easy to
apply requiring fewer data compared to other methods because they use the average rate and SCV
(square coefficient of variation) as the only parameters to characterize the network arrival and
service processes. This work is aimed at analyzing and comparing several approximations since
they are not yet available in the literature. Hence, several network situations were tested in order
to identify the most adequate approximation for each situation. Firstly, a two-station network was
analyzed followed by the analysis of a five-station network and lastly, a real example of a
semiconductor plant, analyzed by Bitran e Tirupati (1988), was used. In order to reach these
goals, the state of the art of approximation methods to evaluate the performance of open queueing
networks was studied, and the approximations were compared using the experiment planning
technique, important factors for building network configuration and data analysis The findings of
this work demonstrate that approximations can be highly efficient to evaluate the performance of
discrete job-shop manufacturing systems. Regardless of the configurations studied, it is worth
mentioning that approximations 3 and 2, in general, showed the best results if compared to the
other values obtained from simulations to evaluate the performance of open queueing networks,
OQN,. The other approximations tended to overestimate E(Lj) when the number of stations is
higher. This study intends to contribute to the development of computing systems in order to
support project decisions and the planning and control of discrete manufacturing systems using
approximations based on the parametric decomposition method<br>Esta dissertação estuda as aproximações baseadas nos métodos analíticos
paramétricos de decomposição usados em redes de filas abertas que modelam sistemas discretos
de manufatura do tipo job-shop. Estas aproximações possuem um importante papel na avaliação
do desempenho de sistemas produtivos e vem se mostrando eficiente para uma grande
diversidade de situações. Além disso, são aproximações relativamente fáceis de serem
aplicadas, necessitando poucos dados em relação a outros métodos, pois utilizam apenas a
média e o scv (coeficiente quadrático de variação) como parâmetros para caracterizar os
processos de chegadas e os processos de serviço da rede. O foco deste trabalho está em realizar
análises e comparações entre diversas aproximações, pois ainda não existe nenhuma
comparação mais efetiva entre elas na literatura. Para isso, diversas situações de redes foram
exploradas para identificar quais aproximações são mais adequadas para quais situações.
Primeiramente é analisado uma rede com 2 estações, posteriormente uma outra com 5 estações
e por fim usou um exemplo real de uma fábrica de semi-condutores, analisada por Bitran e
Tirupati (1988). Para que seja possível atingir esses objetivos, estudou-se o estado da arte das
aproximações dos métodos de avaliação de desempenho para redes de filas abertas, e comparouse
as aproximações por meio de técnicas de planejamento de experimentos, parte importante na
construção das configurações das redes e análise dos resultados. Os resultados apresentados
nesta dissertação mostram que essas aproximações podem ser bem eficientes ao avaliar o
desempenho de sistemas discretos de manufatura do tipo job-shop. Independente das
configurações analisadas, vale destacar a Aproximação 3 e a Aproximação 2, em geral, obtendo
os melhores resultados, entre as aproximações, em comparação aos valores obtidos pela
simulação para avaliar o desempenho de redes de filas OQN. As outras aproximações
demonstraram certo comportamento em sobreestimar E(Lj), quando o número de estações
aumentam. Este estudo pretende contribuir para o desenvolvimento de sistemas computacionais
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para apoiar decisões de projeto, planejamento e controle dos sistemas discretos de manufatura,
usando aproximações baseadas em métodos de decomposição paramétrico
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Gbologah, Franklin Ekoue. "Development of a multimodal port freight transportation model for estimating container throughput." Thesis, Georgia Institute of Technology, 2010. http://hdl.handle.net/1853/34817.
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Computer based simulation models have often been used to study the multimodal freight transportation system. But these studies have not been able to dynamically couple the various modes into one model; therefore, they are limited in their ability to inform on dynamic system level interactions. This research thesis is motivated by the need to dynamically couple the multimodal freight transportation system to operate at multiple spatial and temporal scales. It is part of a larger research program to develop a systems modeling framework applicable to freight transportation. This larger research program attempts to dynamically couple railroad, seaport, and highway freight transportation models. The focus of this thesis is the development of the coupled railroad and seaport models. A separate volume (Wall 2010) on the development of the highway model has been completed.
The model railroad and seaport was developed using Arena® simulation software and it comprises of the Ports of Savannah, GA, Charleston, NC, Jacksonville, FL, their adjacent CSX rail terminal, and connecting CSX railroads in the southeastern U.S. However, only the simulation outputs for the Port of Savannah are discussed in this paper. It should be mentioned that the modeled port layout is only conceptual; therefore, any inferences drawn from the model's outputs do not represent actual port performance.
The model was run for 26 continuous simulation days, generating 141 containership calls, 147 highway truck deliveries of containers, 900 trains, and a throughput of 28,738 containers at the Port of Savannah, GA. An analysis of each train's trajectory from origin to destination shows that trains spend between 24 - 67 percent of their travel time idle on the tracks waiting for permission to move. Train parking demand analysis on the adjacent shunting area at the multimodal terminal seems to indicate that there aren't enough containers coming from the port because the demand is due to only trains waiting to load. The simulation also shows that on average it takes containerships calling at the Port of Savannah about 3.2 days to find an available dock to berth and unload containers. The observed mean turnaround time for containerships was 4.5 days.
This experiment also shows that container residence time within the port and adjacent multimodal rail terminal varies widely. Residence times within the port range from about 0.2 hours to 9 hours with a mean of 1 hour. The average residence time inside the rail terminal is about 20 minutes but observations varied from as little as 2 minutes to a high of 2.5 hours. In addition, about 85 percent of container residence time in the port is spent idle.
This research thesis demonstrates that it is possible to dynamically couple the different sub-models of the multimodal freight transportation system. However, there are challenges that need to be addressed by future research. The principal challenge is the development of a more efficient train movement algorithm that can incorporate the actual Direct Traffic Control (DTC) and / or Automatic Block Signal (ABS) track segmentation. Such an algorithm would likely improve the capacity estimates of the railroad network. In addition, future research should seek to reduce the high computational cost imposed by a discrete process modeling methodology and the adoption of single container resolution level for terminal operations. A methodology combining both discrete and continuous process modeling as proposed in this study could lessen computational costs and lower computer system requirements at a cost of some of the feedback capabilities of the model This tradeoff must be carefully examined.
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Wang, Yunfei. "Un système réactif d'aide à la décision pour le transport intermodal de marchandises." Thesis, Valenciennes, 2017. http://www.theses.fr/2017VALE0010/document.
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Le transport fluvial de conteneurs constitue une activité économique importante qui suscite un intérêt grandissant de la part de scientifiques. Considéré comme durable et économique, le transport par barge a été identifié comme étant une alternative compétitive pour le transport de marchandises, en complément des modes traditionnels de transport, routier et ferroviaire. Néanmoins, les travaux de recherche en rapport avec la planification et le management du transport par barge, en particulier dans le contexte du transport intermodal, sont encore peu abondants. Le but de cette thèse est d’apporter une contribution dans ce domaine, par la proposition de modèles et de méthodes de planification et gestion avancées, dans le cadre d’un système d’aide à la décision pour le transport de conteneurs par barge développé pour accompagner les opérateurs de transport. La méthodologie proposée fait appel à des concepts et principes de gestion du revenu, des ressources et des services de transport pour la conception de plans de services réguliers avec horaires, au niveau tactique. Les opérateurs de transport peuvent ainsi offrir des plans de transport avec des services plus flexibles pour leurs clients, tout en assurant un meilleur niveau de fiabilité. Plus de demandes de transport pourront ainsi être satisfaites, avec globalement une plus grande satisfaction des chargeurs. Une originalité importante proposée par notre approche est l’utilisation de principes et techniques de gestion du revenu (segmentation du marché, classes tarifaires...) aussi bien au niveau opérationnel de la modélisation qu’au niveau tactique. Les problèmes d’optimisation sont formalisés sous forme de modèles de programmation linéaire mixte en nombres entiers (PLNE), implémentés et testés sous différentes configurations de réseaux de transport et différents scénarios de demandes, et ce pour chaque niveau de décision. Au niveau tactique, une nouvelle approche de résolution, combinant la recherche adaptative à voisinage large (ALNS) et la recherche taboue, est proposée pour résoudre des problèmes PLNE de grande taille. Une plateforme de simulation, qui intègre les niveaux tactique et opérationnel de prise de décision, est proposée pour la validation du système d’aide à la décision sous différentes configurations : différentes topologies du réseau physique, différents paramètres pour la gestion du revenu, différents degrés de précision caractérisant les prévisions de demande. Pour l’analyse des résultats numériques ainsi obtenus, plusieurs types d’indicateurs de performance sont proposés et utilisés<br>Barge transportation is an important research topic that started to draw increasing scientific attention in the recent decade. Considered as sustainable, environment-friendly and economical, barge transportation has been identified as a competitive alternative for freight transportation, complementing the traditional road and rail modes. However, contributions related to barge transportation, especially in the context of intermodal transportation, are still scarce. The objective of this thesis is to contribute to fill this gap by proposing a reactive decision support system for freight intermodal barge transportation from the perspective of the carriers. The proposed system incorporates resource and revenue management concepts and principles to build the optimal set of scheduled services plans at the tactical level. Carriers may thus benefit from transportation plans offering increased flexibility and reliability. They could thus serve more demands and better satisfy customers. One novelty of the approach is the application of revenue management considerations (e.g., market segmentation and price differentiation) at both operational and tactical planning levels. The optimization problems are mathematically formalized and mixed integer linear programming (MILP) models are proposed, implemented and tested against various network settings and demand scenarios, for each decision level. At the tactical level, a new solution approach, combining adaptive large neighborhood search (ALNS) and Tabu search is designed to solve large scale MILP problems. An integrated simulation framework, including the tactical and the operational levels jointly, is proposed to validate the decision support system in different settings, in terms of physical network topology, revenue management parameters and accuracy degree of demand forecasts. To analyze the numerical results corresponding to the solutions of the optimization problems, several categories of performance indicators are proposed and used
Books on the topic "Discrete network design"
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Massimi, John J. Truck lane needs methodology: A heuristic approach to solve a five option discrete network design problem. Center for Transportation Research, Bureau of Engineering Research, University of Texas at Austin, 1985.
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Mescheryakova, Natalia, F. T. Aleskerov, and Sergey Shvydun. New Centrality Measures in Networks. Taylor & Francis Group, 2021.
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New Centrality Measures in Networks: How to Take into Account the Parameters of the Nodes and Group Influence of Nodes to Nodes. Taylor & Francis Group, 2021.
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Aleskerov, Fuad, Sergey Shvydun, and Natalia Meshcheryakova. New Centrality Measures in Networks: How to Take into Account the Parameters of the Nodes and Group Influence of Nodes to Nodes. Taylor & Francis Group, 2021.
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Aleskerov, Fuad, Sergey Shvydun, and Natalia Meshcheryakova. New Centrality Measures in Networks: How to Take into Account the Parameters of the Nodes and Group Influence of Nodes to Nodes. Taylor & Francis Group, 2021.
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Beaty, Roger E., and Rex E. Jung. Interacting Brain Networks Underlying Creative Cognition and Artistic Performance. Edited by Kalina Christoff and Kieran C. R. Fox. Oxford University Press, 2018. http://dx.doi.org/10.1093/oxfordhb/9780190464745.013.10.
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Cognitive neuroscience research has begun to address the potential interaction of brain networks supporting creativity by employing new methods in brain network science. Network methods offer a significant advance compared to individual region of interest studies due to their ability to account for the complex and dynamic interactions among discrete brain regions. As this chapter demonstrates, several recent studies have reported a remarkably similar pattern of brain network connectivity across a range of creative tasks and domains. In general, such work suggests that creative thought may involve dynamic interactions, primarily between the default and control networks, providing key insights into the roles of spontaneous and controlled processes in creative cognition. The chapter summarizes this emerging body of research and proposes a framework designed to account for the joint influence of controlled and spontaneous thought processes in creativity.
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Baudouin, Simon, and Steve Ball. Normal physiology of the endocrine system. Oxford University Press, 2016. http://dx.doi.org/10.1093/med/9780199600830.003.0249.
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The endocrine system describes an array of chemical signals (hormones). Working in concert with the nervous system, the endocrine system forms a complex neurohumoral network, communicating changes in the environment to facilitate adaptive responses and serving to integrate those responses in a coherent, coordinated manner. The endocrine system has inherent rhythmicity, which has important implications for the integration and coordination of metabolism, and how we measure endocrine signals in clinical settings. At a cellular level, hormone action is mediated through a series of discrete, but interacting signal transduction pathways. This chapter outlines a functional design approach to endocrinology; providing a framework covering the principles of hormone regulation and hormone action—critical for understanding the role of the endocrine system in physiology and pathophysiology.
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Lin, Nian, and Sebastian Stepanow. Designing low-dimensional nanostructures at surfaces by supramolecular chemistry. Edited by A. V. Narlikar and Y. Y. Fu. Oxford University Press, 2017. http://dx.doi.org/10.1093/oxfordhb/9780199533046.013.10.
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This article describes the use of supramolecular chemistry to design low-dimensional nanostructures at surfaces. In particular, it discusses the design strategies of two types of low-dimensional supramolecular nanostructures: structures stabilized by hydrogen bonds and structures stabilized by metal-ligand co-ordination interactions. After providing an overview of hydrogen-bond systems such as 0D discrete clusters, 1D chains, and 2D open networks and close-packed arrays, the article considers metal-co-ordination systems. It also presents experimental results showing that both hydrogen bonds and metal co-ordination offer protocols to achieve unique nanostructured systems on 2D surfaces or interfaces. Noting that the conventional 3D supramolecular self-assembly has generated a vast number of nanostructures revealing high complexity and functionality, the article suggests that 2D approaches can be applied to substrates with different symmetries as well as physical and chemical properties.
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Michel, Bierlaire. Optimization: Principles and Algorithms. EPFL Press, 2015. http://dx.doi.org/10.55430/6116v1mb.
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Every engineer and decision scientist must have a good mastery of optimization, an essential element in their toolkit. Thus, this articulate introductory textbook will certainly be welcomed by students and practicing professionals alike. Drawing from his vast teaching experience, the author skillfully leads the reader through a rich choice of topics in a coherent, fluid and tasteful blend of models and methods anchored on the underlying mathematical notions (only prerequisites: first year calculus and linear algebra). Topics range from the classics to some of the most recent developments in smooth unconstrained and constrained optimization, like descent methods, conjugate gradients, Newton and quasi-Newton methods, linear programming and the simplex method, trust region and interior point methods. Furthermore elements of discrete and combinatorial optimization like network optimization, integer programming and heuristic local search methods are also presented. This book presents optimization as a modeling tool that beyond supporting problem formulation plus design and implementation of efficient algorithms, also is a language suited for interdisciplinary human interaction. Readers further become aware that while the roots of mathematical optimization go back to the work of giants like Newton, Lagrange, Cauchy, Euler or Gauss, it did not become a discipline on its own until World War Two. Also that its present momentum really resulted from its symbiosis with modern computers, which made it possible to routinely solve problems with millions of variables and constraints. With his witty, entertaining, yet precise style, Michel Bierlaire captivates his readers and awakens their desire to try out the presented material in a creative mode. One of the outstanding assets of this book is the unified, clear and concise rendering of the various algorithms, which makes them easily readable and translatable into any high level programming language. ''This is an addictive book that I am very pleased to recommend.'' Prof. Thomas M. Liebling
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Event-driven architecture: How SOA enables the real-time enterprise. Addison Wesley Professional, 2009.
Find full textBook chapters on the topic "Discrete network design"
1
Liu, Jinkun. "Discrete RBF Neural Network Control." In Intelligent Control Design and MATLAB Simulation. Springer Singapore, 2017. http://dx.doi.org/10.1007/978-981-10-5263-7_10.
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Cardwell, R. "Survivable fiber network design." In DIMACS Series in Discrete Mathematics and Theoretical Computer Science. American Mathematical Society, 1991. http://dx.doi.org/10.1090/dimacs/005/04.
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Wessäly, Roland. "A model for network design." In DIMACS Series in Discrete Mathematics and Theoretical Computer Science. American Mathematical Society, 1998. http://dx.doi.org/10.1090/dimacs/040/24.
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Li, Hao, Michiel C. J. Bliemer, and Piet H. L. Bovy. "Reliability-based Dynamic Discrete Network Design with Stochastic Networks." In Transportation and Traffic Theory 2009: Golden Jubilee. Springer US, 2009. http://dx.doi.org/10.1007/978-1-4419-0820-9_32.
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Cieslik, Dietmar. "Using Hadwiger numbers in network design." In DIMACS Series in Discrete Mathematics and Theoretical Computer Science. American Mathematical Society, 1998. http://dx.doi.org/10.1090/dimacs/040/05.
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Stafylopatis, Andreas N. "Efficient Neural Network Techniques for Discrete Optimization Problems." In Emergent Computing Methods in Engineering Design. Springer Berlin Heidelberg, 1996. http://dx.doi.org/10.1007/978-3-662-03256-5_14.
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Marathe, Madhav, R. Ravi, and R. Sundaram. "Improved results on service-constrained network design problems." In DIMACS Series in Discrete Mathematics and Theoretical Computer Science. American Mathematical Society, 1998. http://dx.doi.org/10.1090/dimacs/040/16.
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Zhang, Lihui, Siriphong Lawphongpanich, and Yafeng Yin. "An Active-set Algorithm for Discrete Network Design Problems." In Transportation and Traffic Theory 2009: Golden Jubilee. Springer US, 2009. http://dx.doi.org/10.1007/978-1-4419-0820-9_14.
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Li, Wu-Ji, and James Smith. "Star, grid, ring topologies in facility location & network design." In DIMACS Series in Discrete Mathematics and Theoretical Computer Science. American Mathematical Society, 1998. http://dx.doi.org/10.1090/dimacs/040/14.
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Nagarajan, Viswanath, and Lily Wang. "Online Generalized Network Design Under (Dis)Economies of Scale." In Proceedings of the 2021 ACM-SIAM Symposium on Discrete Algorithms (SODA). Society for Industrial and Applied Mathematics, 2021. http://dx.doi.org/10.1137/1.9781611976465.167.
Full textConference papers on the topic "Discrete network design"
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Yang, Xuyu, Hongjuan Yang, Tao Xie, and Bo Li. "Joint Beamforming Design for RIS-Assisted Cell-Free Network with Discrete Phase Shifts." In 2024 4th International Conference on Electronics, Circuits and Information Engineering (ECIE). IEEE, 2024. http://dx.doi.org/10.1109/ecie61885.2024.10626812.
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Masud, Md Abdullah Al, Alazar Araia, Yuxin Wang, Jianli Hu, and Yuhe Tian. "Machine Learning-Aided Process Design for Microwave-Assisted Ammonia Production." In Foundations of Computer-Aided Process Design. PSE Press, 2024. http://dx.doi.org/10.69997/sct.121422.
Full textAbstract:
Machine learning (ML) has become a powerful tool to analyze complex relationships between multiple variables and to unravel valuable information from big datasets. However, an open research question lies in how ML can accelerate the design and optimization of processes in the early experimental development stages with limited data. In this work, we investigate the ML-aided process design of a microwave reactor for ammonia production with exceedingly little experimental data. We propose an integrated approach of synthetic minority oversampling technique (SMOTE) regression combined with neural networks to quantitatively design and optimize the microwave reactor. To address the limited data challenge, SMOTE is applied to generate synthetic data based on experimental data at different reaction conditions. Neural network has been demonstrated to effectively capture the nonlinear relationships between input features and target outputs. The softplus activation function is used for a smoother prediction compared to the Rectified Linear Unit activation function. Ammonia concentration is predicted using pressure, temperature, feed flow rate, and feed composition ratio as input variables. For point-wise prediction based on discrete operating conditions, the proposed SMOTE integrated neural network approach outperforms with 96.1% accuracy compared to neural networks (without SMOTE), support vector regression, and linear regression. The multi-variate prediction trends are also validated which are critical for design optimization.
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Wang, LuYao, Zhaoping Du, Wentao Xue, and Haojie Wang. "Controller Design for a Class of Nonlinear Discrete Networked Cascade Control Systems With State Delay and Network-Induced Delay." In 2024 China Automation Congress (CAC). IEEE, 2024. https://doi.org/10.1109/cac63892.2024.10865104.
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Qiu, Kang, Sigmund Eggen Holm, Julian Straus, and Simon Roussanaly. "Optimal Clustered, Multi-modal CO2 Transport Considering Non-linear Costs � a Path-planning Approach." In Foundations of Computer-Aided Process Design. PSE Press, 2024. http://dx.doi.org/10.69997/sct.150076.
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An important measure to achieve global reduction in CO2 emissions is CO2 capture, transport, and storage. The deployment of CO2 capture requires the development of a shared CO2 transport infrastructure, where CO2 can be transported with different transport modes. Furthermore, the cost of CO2 transport can be subject to significant economies of scale effects with respect to the amount of CO2 transported, also mentioned as clustering effects. Therefore, optimizing the shared infrastructure of multiple CO2 sources can lead to significant reductions in infrastructure costs. This paper presents a novel formulation of the clustered CO2 transport network. The Markov Decision Process formulation defined here allows for more detailed modeling of non-linear, discrete transport costs and increased geographical resolution. The clustering effects are modeled through cooperative multi-agent interactions. A multi-agent, reinforcement learning-based algorithm is proposed to optimize the shared transportation network, with examples illustrating the results of the method.
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Yang, Yanguo, Dongsheng Guo, Xiyuan Zhang, and Naimeng Cang. "Design and Validation of Discrete-Time Zeroing Neural Network for Time-Dependent Linear System of Equation and Inequality." In 2024 International Conference on Intelligent Robotics and Automatic Control (IRAC). IEEE, 2024. https://doi.org/10.1109/irac63143.2024.10871243.
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Iftakher, Ashfaq, and M. M. Faruque Hasan. "Exploring Quantum Optimization for Computer-aided Molecular and Process Design." In Foundations of Computer-Aided Process Design. PSE Press, 2024. http://dx.doi.org/10.69997/sct.143809.
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Computer-aided Molecular and Process Design (CAMPD) is an equation-oriented multi-scale decision making framework for designing both materials (molecules) and processes for separation, reaction, and reactive separation whenever material choice significantly impacts process performance. The inherent nonlinearity and nonconvexity in CAMPD optimization models, introduced through the property and process models, pose challenges to state-of-the-art solvers. Recently, quantum computing (QC) has shown promise for solving complex optimization problems, especially those involving discrete decisions. This motivates us to explore the potential usage of quantum optimization techniques for solving CAMPD problems. We have developed a technique for directly solving a class of mixed integer nonlinear programs using QC. Our approach represents both continuous and integer design decisions by a set of binary variables through encoding schemes. This transformation allows to reformulate certain types of CAMPD problems into Quadratic Unconstrained Binary Optimization (QUBO) models that can be directly solved using quantum annealing techniques. We illustrate this technique for the selection of optimal ionic liquids (IL) and the configuration of a reactor-separator process network. We also discuss several challenges that are associated with quantum optimization when solving large scale CAMPD problems.
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Hossain, Shakhawath, Per Bergström, Sohan Sarangi, and Tetsu Uesaka. "Computational Design of Fibre Network by Discrete Element Method." In Advances in Pulp and Paper Research, Oxford 2017, edited by W. Batchelor and D. Söderberg. Fundamental Research Committee (FRC), Manchester, 2017. http://dx.doi.org/10.15376/frc.2017.2.651.
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Soft fibre networks, typically seen in bathroom tissues, kitchen towels, and personal-care products, have properties that are intricately affected by the details of fibre geometry, 3D-network structures, and processing conditions. Designing such materials and products for better performance, while controlling cost, is especially a challenge in today’s fast paced product development. This paper concerns the development of a new, robust computational design platform for the design of soft fibre networks. We have used particle-based methods, particularly, Discrete Element Method (DEM), to model fibres, fibre networks, their properties and performance, and also unit processes for manufacturing. Unlike other computational methods, this method has advantages to model discrete and non-homogeneous materials, complex geometries, and highly non-linear dynamic problems, such as large deformation (flow), contact/non/contact, fracture, and fragmentation. With this approach, fibres are represented by a series of connected spherical particles in different lengths and geometries (curl, kinks, twists). Fiber networks are created by the deposition of those fibres under gravity, followed by the subsequent consolidation under pressure. here processes have shown an interesting transition phenomenon from a highly fluidic granular system to a fragile soft solid. The network is then subjected to a creping process, a critical process of tissue-making. The model was able, not only to reproduce unique crepe frequencies, but also unprecedented details of the destruction of fibre network structures and fibre failure (dusting) during creping. Typical tensile tests, thickness-direction compression tests, and softness tests have been also performed to demonstrate unique deformation characteristics of low-density, low-basis weight fibre networks. This computational design system based on DEM provides a promising platform for exploring large parameter space of new material/product design.
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Panigrahi, Debmalya. "Survivable Network Design Problems in Wireless Networks." In Proceedings of the Twenty-Second Annual ACM-SIAM Symposium on Discrete Algorithms. Society for Industrial and Applied Mathematics, 2011. http://dx.doi.org/10.1137/1.9781611973082.78.
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Olver, Neil, and F. Bruce Shepherd. "Approximability of Robust Network Design." In Proceedings of the Twenty-First Annual ACM-SIAM Symposium on Discrete Algorithms. Society for Industrial and Applied Mathematics, 2010. http://dx.doi.org/10.1137/1.9781611973075.89.
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Barman, Siddharth, and Shuchi Chawla. "Traffic-Redundancy Aware Network Design." In Proceedings of the Twenty-Third Annual ACM-SIAM Symposium on Discrete Algorithms. Society for Industrial and Applied Mathematics, 2012. http://dx.doi.org/10.1137/1.9781611973099.118.
Full textReports on the topic "Discrete network design"
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Rulkov, Nikolai. Nonlinear Maps for Design of Discrete Time Models of Neuronal Network Dynamics. Defense Technical Information Center, 2016. http://dx.doi.org/10.21236/ad1004577.
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Rulkov, Nikolai. Nonlinear Maps for Design of Discrete-Time Models of Neuronal Network Dynamics. Defense Technical Information Center, 2016. http://dx.doi.org/10.21236/ad1007639.
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Hughes, James, Robert Emmott, Evan Raskin, Brian Witcher, and Wendy Wright. Protocol narrative: Long-term discrete water quality monitoring at Big South Fork National River and Recreation Area, Blue Ridge Parkway, and Obed Wild and Scenic River. National Park Service, 2018. https://doi.org/10.36967/2258269.
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Under the mandate of the National Parks Omnibus Management Act (1998), the National Park Service (NPS) developed a natural resources Inventory and Monitoring (I&M) program as part of a comprehensive effort to identify key natural resources within the National Park system and to provide long term monitoring of the integrity of those resources. The NPS has grouped parks into 32 I&M networks based on ecological similarity and geographic proximity. The Appalachian Highlands Inventory and Monitoring Network (APHN) includes four NPS units: Big South Fork National River and Recreation Area (BISO), Obed Wild and Scenic River (OBRI), Blue Ridge Parkway (BLRI), and Great Smoky Mountains National Park (GRSM). Natural resource inventories of APHN parks that have been completed to date indicate that these parks are among the most ecologically and biologically diverse within the National Park system. This protocol describes the background, rationale, and sampling design for monitoring water quality using discrete sampling of water at fixed and rotating sampling stations for three APHN parks: Big South Fork NRRA, Obed WSR and Blue Ridge Parkway. The main goals of this document are: (1) to describe the overall strategy for discrete water-quality monitoring that is credible and scientifically rigorous, (2) to identify the sampling design and sampling stations within each park, (3) to identify and justify key water-quality and -quantity indicators that will be monitored, and (4) to provide a specific set of instructions in the form of standard operating procedures (SOPs) that are sufficiently detailed to ensure consistent and comparable data collection for current and future practitioners. The structure of this document follows the recommended framework and suggestions of Oakley et al. (2003). This document also describes important aquatic resources within the affected parks, and briefly summarizes characteristics of geology, soils, climate and hydrology that must be considered when monitoring water quality at Big South Fork NRRA, Obed WSR, and Blue Ridge Parkway. A case is made for the relevance of this effort by highlighting known water quality issues in the parks, as well as describing some of the important linkages between water quality and park resources that may help provide early warning of changing conditions or issues of concern in the future. The objective of this long-term monitoring project is to determine annual status and long-term trends for key indicators of water resource condition. Field analyses include pH, specific conductance, temperature, dissolved oxygen, acid neutralization capacity (ANC), and turbidity. Laboratory analyses are broadly grouped into the following analytical schedules: (1) pH/buffering capacity, (2) (dissolved) solids, (3) routine anions/cations, (4) nutrients, (5) metals/metalloids, and (6) bacteriology. To complement these field and laboratory analyses, the network will make concurrent stream discharge measurements in accordance with USGS methodologies at each sampling station. The APHN Long-Term Water Quality Monitoring Protocol for Discrete Sampling provides a tiered approach to optimize assessment of water resource integrity in network parks within the constraints of available resources. Level I monitoring includes fixed stations on and adjacent to the Blue Ridge Parkway corridor and at main stem rivers and key tributaries within the Obed Wild and Scenic River and the Big South Fork National River and Recreation Area. These stations will be sampled on either a monthly (if co-located with a USGS Gage) or quarterly frequency. Level II monitoring includes a bank of sampling stations from which sites will be chosen and sampled on an annually rotating basis at a quarterly frequency. Level II monitoring is intended to supplement the long term fixed stations described above to provide more complete evaluation of water resource integrity throughout designated park lands. Data collected using this protocol
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Bailard, Jennifer. Mojave Desert Network (MOJN) Streams and Lakes (STLK) Data Quality Report 2024. National Park Service, 2025. https://doi.org/10.36967/2312646.
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This HTML report summarizes data quality evaluations of discrete data collected for the Mojave Desert Network Inventory and Monitoring Program Streams and Lakes protocol. This protocol is designed to monitor the hydrologic and ecosystem health of nine streams and six subalpine lakes in Great Basin National Park. Collected data include lake surface elevations, lake clarity, water quality measurements, stream channel characteristics, water chemistry samples, and benthic macroinvertebrate samples. Lake surface elevations, lake clarity, water quality measurements, and stream channel characteristics data cover 2009 to 2024. Water chemistry sample data cover 2009 to 2023. Benthic macroinvertebrate sample data are published in a separate data package and cover 2009 to 2023.
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Bailard, Jennifer. Mojave Desert Network (MOJN) Streams and Lakes (STLK) Data Quality Report 2024. National Park Service, 2025. https://doi.org/10.36967/2313986.
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This HTML report summarizes data quality evaluations of discrete data collected for the Mojave Desert Network Inventory and Monitoring Program Streams and Lakes protocol. This protocol is designed to monitor the hydrologic and ecosystem health of nine streams and six subalpine lakes in Great Basin National Park. Collected data include lake surface elevations, lake clarity, water quality measurements, stream channel characteristics, water chemistry samples, and benthic macroinvertebrate samples. Lake surface elevations, lake clarity, water quality measurements, stream channel characteristics, and water chemistry sample data are published in the associated data package and cover 2009 to 2024. Benthic macroinvertebrate sample data are published in a separate data package and cover 2009 to 2024.