Search results for "Travel"
showing 10 items of 402 documents
A branch-price-and-cut algorithm for the capacitated multiple vehicle traveling purchaser problem with unitary demand
2021
Abstract The multiple vehicle traveling purchaser problem (MVTPP) consists of simultaneously selecting suppliers and routing a fleet of homogeneous vehicles to purchase different products at the selected suppliers so that all product demands are fulfilled and traveling and purchasing costs are minimized. We consider variants of the MVTPP in which the capacity of the vehicles can become binding and the demand for each product is one unit. Corresponding solution algorithms from the literature are either branch-and-cut or branch-and-price algorithms, where in the latter case the route-generation subproblem is solved on an expanded graph by applying standard dynamic-programming techniques. Our …
Efficient GRASP+VND and GRASP+VNS metaheuristics for the traveling repairman problem
2011
Abstract: The traveling repairman problem is a customer-centric routing problem, in which the total waiting time of the customers is minimized, rather than the total travel time of a vehicle. To date, research on this problem has focused on exact algorithms and approximation methods. This paper presents the first metaheuristic approach for the traveling repairman problem.
Magnetically excited breather modes in an overlap-geometry Josephson tunnel junction
2022
A scheme for the controlled generation of single traveling sine- Gordon breathers in a long Josephson junction is described. In the presence of dissipation, a direct current source, and thermal fluctuations, the theoretical analysis shows that, through the nonlinear supratransmission effect, tailored magnetic pulses at the junction’s edge can effectively yield breather modes only.
Corrigendum to “Smooth and non-smooth traveling wave solutions of some generalized Camassa–Holm equations” [19 (6) (2014) 1746–1769]
2015
Corrigendum Corrigendum to ‘‘Smooth and non-smooth traveling wave solutions of some generalized Camassa–Holm equations’’ [19 (6) (2014) 1746–1769] M. Russo , S. Roy Choudhury , T. Rehman , G. Gambino b University of Central Florida, Department of Mathematics, 4000 Central Florida Blvd., Orlando, USA University of Palermo, Department of Mathematics and Computer Science, Via Archirafi 34, 90123 Palermo, Italy
Corrigendum to “Regular and singular pulse and front solutions and possible isochronous behavior in the short-pulse equation: Phase-plane, multi-infi…
2022
Section 7 of the original paper contained several errors which are corrected here. Equations (54) and (55) are incorrect. In the following, the corrected versions of these equations are given and the subsequent results of Section 7 are also revised.
An Investigation of the Robustness in the Travelling Salesman Problem Routes Using Special Structured Matrices
2020
In this study, the robustness of the Travelling Salesman Problem (TSP) routes is investigated by recognising the special combinatorial structures of Kalmanson matrices. A recognition algorithm encompassing three procedures based on combinatorial and linear programming (LP) is developed and executed on several randomly generated instances. These procedures produce three lower bounds which provide guarantees on the optimality of the solutions. Computational experiments show that the proposed LP-based procedure performs efficiently well across all problem dimensions and provides the best lower bounds to the TSP. This is supported by an average deviation of less than 7% between the TSP tour len…
A Branch-and-Cut Algorithm for the Single Truck and Trailer Routing Problem with Satellite Depots
2016
International audience; In the single truck and trailer routing problem with satellite depots (STTRPSD), a truck with a detachable trailer based at a main depot must serve the demand of a set of customers accessible only by truck. Therefore, before serving the customers, it is necessary to detach the trailer in an appropriate parking place (called either a satellite depot or a trailer point) and transfer goods between the truck and the trailer. This problem has applications in milk collection for farms that cannot be reached using large vehicles. In this work we present an integer programming formulation of the STTRPSD. This formulation is tightened with several families of valid inequaliti…
The Many Faces of Turku : An Essayistic Study of Urban Travel
2020
What does it mean to take a photographic, imaginary, or fictional journey to some destination? How does indirect observation of the object differ from direct observation? What are they like, the immediate and the mediated Turku? Which of them is more real or more authentic? Turku is Finland’s most poetic city. It is also the most European of our cities. As the flâneur saunters along the banks of the River Aura, he traverses several centuries. The murmur of yesteryear is to be heard in the old buildings and in the foliage of the time-honoured trees. Here is the cradle, the first home of Finnish civilization. The philosopher-poet is able to see into the essence of a city: he has the patience …
Airline Loyalty Determinants among Business Travelers: Empirical Evidence from Croatia
2017
AbstractAirline passenger loyalty has been the subject of several studies set within a general travel context. These studies have helped understanding the influence of variables like brand equity, airline service levels, customer commitment, but also price in tying a passenger to a particular airline. Despite the great economic importance of the business traveler market, no study has, however, so far, exclusively focused on this traveler segment and tried to investigate drivers of repurchase intentions and loyalty of this specific traveler type. This study aims to address this research gap. The findings reveal that business passenger loyalty is far stronger driven by emotional than rational…
Traveling Together as a Couple: Gender, Diplomacy, and Cultural Mediation in the Life of the Countess of Fernán Núñez, Spanish Ambassadress in Lisbon…
2023
Este artículo profundiza en el papel jugado por las mujeres como mediadoras culturales en el siglo XVIII. Su punto de partida es la figura poco conocida de María, condesa de Fernán Núñez, embajadora de España en Portugal (1777-1787) y Francia (1787-1791), quien llevó una vida transnacional marcada por viajes, cortes internacionales y embajadas, todos espacios de sociabilidad tradicionalmente vinculados al estudio de la mediación cultural, ámbito que en los últimos años ha comenzado a ser estudiado desde la perspectiva de género. La experiencia de la condesa arroja luz sobre las contribuciones de las esposas de los embajadores y diplomáticos a la vida política y cultural europea y sobre las …