701 research outputs found
Preface
No full textDuring June 15–20, 2014, a group of scientists gathered together in a conferenceon “Optimization, Control and Applications in the Information Age” in order tocelebrate and honor Panos M. Pardalos on the occasion of his 60th birthday. Themeeting took place at theMeliton Hotel of Porto Carras on the middle leg (Sithonia)of the Chalkidiki peninsula in Macedonia, northern Greece, a place of exquisitebeauty and one of Panos’s favorite places. The conference was organized by SergiyButenko and Athanasios Migdalas and was attended by scientists from all over theworld. More than 50 members of this “Panos’s club” presented talks during thisevent.This volume is dedicated to Panos M. Pardalos, on the occasion of his 60thbirthday. The articles collected in this volume are based on selected talks presentedduring the conference. Several members of the Panos’s club could not attendconference, but have submitted their papers to this volume in order to honor him.The papers published in this volume cover a wide range of topics and presentrecent developments and surveys in research fields to which Pardalos has activelycontributed and promoted during his career.In addition, Panos’s spouse, Rosemary Bakker, has written a brief biographydescribing Panos’s exciting journey from a pastoral village on the high mountainsin Thessaly, central Greece, to a Distinguished Professorship at the University ofFlorida, that is, Panos’s own Odyssey. We therefore dedicate to him the first versesof Homer’s Odyssey and Cavaphes’ poem “Ithaka” believing that they accuratelydescribe Panos’s past, his present, and his future discovery voyages.We are indebted to Springer publishers and particularly to Razia Amzad for theirsupport in making the publication of this volume possible.</p
A Hybrid Genetic—GRASP Algorithm Using Lagrangean Relaxation for the Traveling Salesman Problem
No full textHybridization techniques are very effective for the solution of combinatorial optimization problems. This paper presents a genetic algorithm based on Expanding Neighborhood Search technique (Marinakis, Migdalas, and Pardalos, Computational Optimization and Applications, 2004) for the solution of the traveling salesman problem: The initial population of the algorithm is created not entirely at random but rather using a modified version of the Greedy Randomized Adaptive Search Procedure. Farther more a stopping criterion based on Lagrangean Relaxation is proposed. The combination of these different techniques produces high quality solutions. The proposed algorithm was tested on numerous benchmark problems from TSPLIB with very satisfactory results. Comparisons with the algorithms of the DIMACS Implementation Challenge are also presented</p
The Δρομοδείχτης της Ελλάδος of 1824 and Athanasios Stageirites (Τίτλος περίληψης)
No full textσ. [281]-290Κείμενο στα ελληνικά με περίληψη στα αγγλικά με τον τίτλο: The Δρομοδείχτης της Ελλάδος of 1824 and Athanasios StageiritesThe article first examines the close relationship between the publication “Δρομοδείχτης της Ελλάδος” [1824] and the publication “Ηπειρωτικά” (1819) by Athanasios Stageirites and then suggests that Athanasios Stageirites is the likeliest author of the “Δρομοδείχτης της Ελλάδος”.Δωδώνη: Τεύχος Πρώτο: επιστημονική επετηρίδα του Τμήματος Ιστορίας και Αρχαιολογίας της Φιλοσοφικής Σχολής του Πανεπιστημίου Ιωαννίνων; Τόμ. 43-44 (2014-2015
Convex Cost Multicommodity Flow Problems : Applications and Algorithms
No full textWe review and analyze nonlinear programming approaches to model-ing and solving certain flow problems in telecommunications, trans-portation and supply chain management. We emphasize the commonaspects of telecommunications and road networks, and indicate the im-portance of game theoretic and equilibrium approaches. Algorithmsbased on the Frank-Wolfe method are developed in depth and theirimplementations on sequential and parallel machines are discussed andevaluated for large-scale real-world networks. Several research direc-tions are also stated.SUMMER COURSE ON OPERATIONAL RESEARCH AND APPLICATIONS, May 15-18, 2013LABORATORY OF ALGORITHMS AND TECHNOLOGIES FOR NETWORK ANALYSIS (LATNA)HIGHER SCOOL OF ECONOMICS (HSE)NATIONAL RESEARCH UNIVERSITYNizhny Novgorod, Russian Federationhttp://nnov.hse.ru/en/latna/conferences/school2013Upprättat; 2013; 20150306 (athmig
Calibration in survey sampling as an optimization problem
No full textCalibration is a technique of adjusting sample weights routinely used in sample surveys. In this chapter, we consider calibration as an optimization problem and show that the choice of optimization function has an effect on the calibrated weights. We propose a class of functions that have several desirable properties, which includes satisfying necessary range restrictions for the weights. In this chapter, we explore the effect these new functions have on the calibrated weights
Hoàng Tuy (7 December 1927–14 July 2019)—in Appreciation
No full textThis article is intended to honor the late Professor Hoàng Tuy, a highly respected researcher and author in the field of Global Optimization. It summarizes our interaction with him and some of his many contributions to the field of optimization as well as his difficult road to success and international recognition.</p
Review of Basic Local Searches for Solving the Minimum Sum-of-Squares Clustering Problem
No full textAging in the Contemporary Urban Context: The Mortality Rates of Older Residents in Genoa, Italy
No full textBackground and Aims: The development of contemporary urbanization and the consequent growing complexity of social life have to be related with the demographic ageing process, diffusely interesting more and more Wester as well non-Western societies (Phillipson, 2013). Understanding the lives of the increasing number of older residents within the rapid contextual changing of urban environments become a priority issue both for urban architects and social gerontologists, as well, especially for city decision makers (Scharf et al., 2002; Rodwin et al., 2006; Ogg and Bonvalet, 2007). This study assessed the association between the living conditions of older residents and the urban settings where they experience the ageing process. The main objective was to realize a secondary data analysis leading to an efficient decision support system, focused on a deeply detailed geo-mapping representation of the Genoa municipality (a metropolitan urban context of northern Italy describing an aging index equal to 235.9 in 2013, compared to the national mean value of 152.7 and the EU28 mean value of 117.7), in order to support local policy makers in evaluating the vulnerability risk for older residents and planning adequate urban interventions.
Methods: This was a secondary data analysis combined with a geo-referencing model. The study was realized on big datasets provided by the official statistical registry of the Municipality of Genoa, deepening the analysis to the tiniest possible level of territorial observation. In order to perform a very detailed examination of the contextual living conditions of older residents, we assessed at smallest city block level the association of standard mortality rates of over65s with several factors of social and structural exclusion, like the levels of isolation of older residents, the average income and education levels of the neighborhood, the degree of deterioration of the building environment. Data where analyzed through SPSS statistical software and geospatially represented by QGIS mapping system, providing a detailed map of the whole town describing though adequate alert indicators the different territorial risk for older residents of exposure to vulnerability.
Results: Standard mortality rates of over 65s resulted significantly higher within those city blocks evidencing highest levels of social exclusion, economic deprivation and environmental decay, with a major gender disadvantaged for female older people and for older residents living in suburban contexts. The geo-referenced representation of results provided a mapping alert system helpful for decision makers to plan adequate interventions of social and urban requalification.
Conclusions: Our study, beyond implicit ecological limitations, demonstrates, on the one hand, the importance of focusing a specific attention to inclusion and exclusion processes interesting older people in town environment, and, on the other hand, the opportunity of converting the already available and continuously updated datasets of city registry offices in useful planning tools, helping older residents to better experience later stages of life within the increasing complexity of the contemporary urban setting
Dataset in support of the Southampton doctoral thesis 'The boatbuilding tradition of the Aegean during the Late Neolithic – Early Bronze Age periods. Typological classification, digital reconstruction and seakeeping assessment'
No full textDataset in support of the Southampton doctoral thesis 'The boatbuilding tradition of the Aegean during the Late Neolithic – Early Bronze Age periods. Typological classification, digital reconstruction and seakeeping assessment' Appendix D - Resistance data and Appendix C - Stability data.
This dataset is focused on two appendices:
Appendix D - Resistance data. D.1 Resistance data produced by the author via MAXSURF Resistance for this thesis.
Appendix C - Stability data
C1. Stability data – STIX and ISO criteria, produced by the author via MAXSURF Stability software for his thesis
This research was funded by Southampton Marine and Maritime Institute (SMMI), Vice-Chancellor's Scholarship, Greek Archaeological Committee UK (GACUK)
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