11,548 research outputs found
Average Cost of QuickXsort with Pivot Sampling
No full textQuickXsort is a strategy to combine Quicksort with another sorting method X so that the result has essentially the same comparison cost as X in isolation, but sorts in place even when X requires a linear-size buffer. We solve the recurrence for QuickXsort precisely up to the linear term including the optimization to choose pivots from a sample of k elements. This allows to immediately obtain overall average costs using only the average costs of sorting method X (as if run in isolation). We thereby extend and greatly simplify the analysis of QuickHeapsort and QuickMergesort with practically efficient pivot selection, and give the first tight upper bounds including the linear term for such methods
LIPIcs, Volume 302, AofA 2024, Complete Volume
No full textLIPIcs, Volume 302, AofA 2024, Complete Volum
Front Matter, Table of Contents, Preface, Conference Organization
No full textFront Matter, Table of Contents, Preface, Conference Organizatio
Funnelselect: Cache-Oblivious Multiple Selection
No full textWe present the algorithm funnelselect, the first optimal randomized cache-oblivious algorithm for the multiple-selection problem. The algorithm takes as input an unsorted array of N elements and q query ranks r_1 0, and Δ_i = r_i - r_{i-1} (assuming r_0 = 0 and r_{q+1} = N + 1). This is the best possible I/O bound in the cache-oblivious and external memory models. The result is achieved by reversing the computation of the cache-oblivious sorting algorithm funnelsort by Frigo, Leiserson, Prokop and Ramachandran [FOCS 1999], using randomly selected pivots for distributing elements, and pruning computations that with high probability are not expected to contain any query ranks
Deterministic Cache-Oblivious Funnelselect
No full textIn the multiple-selection problem one is given an unsorted array S of N elements and an array of q query ranks r1 Pqi=1+1 ∆Bi · logM/B∆Ni +NB), where B is the external memory block size, M ≥ B1+ε is the internal memory size, for some constant ε > 0, and ∆i = ri − ri−1 (assuming r0 = 0 and rq+1 = N + 1)
Nearly-Optimal Mergesorts: Fast, Practical Sorting Methods That Optimally Adapt to Existing Runs
No full textWe present two stable mergesort variants, "peeksort" and "powersort", that exploit existing runs and find nearly-optimal merging orders with negligible overhead. Previous methods either require substantial effort for determining the merging order (Takaoka 2009; Barbay & Navarro 2013) or do not have an optimal worst-case guarantee (Peters 2002; Auger, Nicaud & Pivoteau 2015; Buss & Knop 2018) . We demonstrate that our methods are competitive in terms of running time with state-of-the-art implementations of stable sorting methods
Spontaneous gene flow and population structure in wild and cultivated chicory, Cichorium intybus L.
No full textSpontaneous gene flow between wild and cultivated chicory, Cichorium intybus L., may have implications for the genetic structure and evolution of populations and varieties. One aspect of this crop-wild gene flow is the dispersal of transgenes from genetically modified varieties, e.g. gene flow from GM chicory to natural chicory could have unwanted consequences. With the purpose to identify and quantify crop-wild gene flow in chicory, we analysed introgression in 19 wild chicory populations and 16 accessions of chicory varieties and landraces distributed across Northern, Central and Mediterranean Europe. The analysis used 281 AFLP markers and 75 SSAP markers giving a total of 356 polymorphic markers. Results from model based assignments with the program STRUCTURE indicated many incidents of recent gene flow. Gene flow was observed both between cultivars and wild populations, between landraces and wild populations, between different wild populations as well as between cultivars. Population structure visualized by distance-based clustering showed a North–South geographical structuring of the wild populations, and a general grouping of the cultivars corresponding to known origin. The results indicated, however, that the structuring between the two groups of wild and cultivated types was weak. As crop and wild recipients are genetically close and genes are transferred between the two types rather frequently, focus on mitigating crop-wild gene flow should be increased, before transgenic varieties are cultivated openly
Diagnosing wild species harvest : resource use and conservation /
No full textDiagnosing Wild Species Harvest bridges gaps of knowledge fragmented among scientific disciplines as it addresses this multifaceted phenomenon that is simultaneously global and local. The authors emphasize the interwoven nature of issues specific to the ecological, economic, and socio-cultural realms of wild species harvest. The book presents the diagnosing wild species harvest procedure as a universal approach that integrates seven thematic perspectives to harvest systems: resource dynamics, costs and benefits, management, governance, knowledge, spatiality, and legacies. When analyzed, these themes help to build a holistic understanding of this globally important phenomenon. Scholars, professionals and students in various fields related to natural resources will find the book a valuable resource. Wild species form important resources for people worldwide, and their harvest is a major driver of ecosystem change. Tropical forests regions, including Amazonia, are among those parts of the world where wild species are particularly important for people's livelihoods and larger economies. This book draws on tangible experiences from Amazonia, presented in lively narratives intermingling scientific information with stories of the people engaged in harvest and management of wild species.Includes bibliographical references and index.Diagnosing Wild Species Harvest bridges gaps of knowledge fragmented among scientific disciplines as it addresses this multifaceted phenomenon that is simultaneously global and local. The authors emphasize the interwoven nature of issues specific to the ecological, economic, and socio-cultural realms of wild species harvest. The book presents the diagnosing wild species harvest procedure as a universal approach that integrates seven thematic perspectives to harvest systems: resource dynamics, costs and benefits, management, governance, knowledge, spatiality, and legacies. When analyzed, these themes help to build a holistic understanding of this globally important phenomenon. Scholars, professionals and students in various fields related to natural resources will find the book a valuable resource. Wild species form important resources for people worldwide, and their harvest is a major driver of ecosystem change. Tropical forests regions, including Amazonia, are among those parts of the world where wild species are particularly important for people's livelihoods and larger economies. This book draws on tangible experiences from Amazonia, presented in lively narratives intermingling scientific information with stories of the people engaged in harvest and management of wild species.Online resource; title from PDF title page (ScienceDirect, viewed Dec. 16, 2013).pt. I. Focus on wild species harvest -- pt. II. Stories from the forest floor -- pt. III. Seven thematic perspectives -- pt. IV. Diagnosis and action.Elsevie
"Badly Wrong" - Der Existenzialismus und J. M. Coetzees The Lifes of Animals
No full textDie Existenzphilosophie ist geprägt vom Nachdruck auf den existierenden Menschen, der sein Leben philosophisch zu durchdringen sucht. Diesem Leitgedanken verpflichtet, plädieren die hier vorliegenden Beiträge für eine Lebenskunst, die die sinnlichen und geistigen Vermögen in ihrer Spannung produktiv werden lässt; für eine kohärente Wertehaltung und Lebensführung, etwa im Umgang mit Tieren und unseren Essgewohnheiten; für eine Reflexion über den modernen Glücksbegriff; für ein Selbstverständnis, das das menschliche Leben in der Spannung von Zufall und Entscheidung reflektiert; für ein Nachdenken darüber, wie unser Umgang mit Zeit sowohl unsere Lebensform als auch unser Glück bestimmen kann oder wieso es uns passieren kann, dass wir gerade dort, wo wir am autonomsten zu sein glauben, die höchste Abhängigkeit erfahren. Die philosophiehistorisch orientierten Beiträge widmen sich Aristoteles' Diktum, wonach der Mensch von Natur aus nach Wissen strebe; erläutern, welche Rolle Henri Bergson der Intuition zuschreibt und warum seine Überlegungen bis heute für uns relevant sind, und denken mit Merleau-Ponty darüber nach, inwiefern die Sinnfrage eine unhintergehbare Bedingung menschlicher Existenz ist. Ein weiterer Beitrag widmet sich der gesellschaftspolitischen Frage, ob und wie die Moralphilosophie dem Einzelnen und der Gesellschaft helfen kann, moralisch richtige Entscheidungen zu treffen. Mit Beiträgen von: Emil Angehrn, Anthony Feneuil, Rafael Ferber, Gottfried Gabriel, Gunnar Hindrichs, Sebastian Hüsch, Georg Kohler, Annemarie Pieper, Peter Schaber, Daniel Schulthess, Tilo Wesche, Markus Wild, Jean-Claude Wol
Twelve Select Examples Of The Ecclesiastical Architecture Of The Middle Ages, Chiefly In France, From Drawings By Charles Wild
No full textTWELVE SELECT EXAMPLES OF THE ECCLESIASTICAL ARCHITECTURE OF THE MIDDLE AGES, CHIEFLY IN FRANCE, FROM DRAWINGS BY CHARLES WILD
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