A Path Twice Traveled Book in PDF, ePub and Kindle version is available to download in english. Read online anytime anywhere directly from your device. Click on the download button below to get a free pdf file of A Path Twice Traveled book. This book definitely worth reading, it is an incredibly well-written.
In this memoir, Paul A. Cohen, one of the West’s preeminent historians of China, traces the development of his work from its inception in the early 1960s to the present, offering fresh perspectives that consistently challenge us to think more deeply about China and the historical craft in general. A memoir, of course, is itself a form of history. But for a historian, writing a memoir on one’s career is quite different from the creation of that career in the first place. This is what Cohen alludes to in the title A Path Twice Traveled. The title highlights the important disparity between the past as originally experienced and the past as later reconstructed, by which point both the historian and the world have undergone extensive change. This distinction, which conveys nicely the double meaning of the word history, is very much on Cohen’s mind throughout the book. He returns to it explicitly in the memoir’s final chapter, appropriately titled “Then and Now: The Two Histories.”
A SECOND GO-ROUND-James Francis sits on a bar stool the night of his 65th birthday reflecting on his sad life. He grew up hating his father, married the wrong girl and was soon divorced. He never had any children or close friends and now he's alone facing his twilight years. Bitter memories are his sole companions. Or so he believes until he is approached by a funny little man who suggest that he might be able to go back and re-live his life-a second time. Only with one major difference. This time he would make the right decisions. If that were at all possible, would he accept the offer?-And thus begins R.A. Jones' wonderful tale of a man miraculously given a second chance at life. It is a poignant story that reveals the significance of every choice we make along the journey. Each choice having endless cause and effect to shape the person we will ultimately become. As for James Francis, his do-over is one filled with love, heartache and forgiveness no reader will ever forget.
The first edition of Connections was chosen by the National Association of Publishers (USA) as the best book in ?Mathematics, Chemistry, and Astronomy ? Professional and Reference? in 1991. It has been a comprehensive reference in design science, bringing together in a single volume material from the areas of proportion in architecture and design, tilings and patterns, polyhedra, and symmetry. The book presents both theory and practice and has more than 750 illustrations. It is suitable for research in a variety of fields and as an aid to teaching a course in the mathematics of design. It has been influential in stimulating the burgeoning interest in the relationship between mathematics and design. In the second edition there are five new sections, supplementary, as well as a new preface describing the advances in design science since the publication of the first edition.
Discrete Geometry for Computer Imagery by Christophe Reutenauer Pdf
This book constitutes the refereed proceedings of the 15th IAPR International Conference on Discrete Geometry for Computer Imagery, DGCI 2009, held in Montréal, Canada, in September/October 2009. The 42 revised full papers were carefully reviewed and selected from numerous submissions. The papers are organized in topical sections on discrete shape, representation, recognition and analysis; discrete and combinatorial tools for image segmentation and analysis; discrete and combinatorial Topology; models for discrete geometry; geometric transforms; and discrete tomography.
Classic graph problems made temporal – a parameterized complexity analysis by Molter, Hendrik Pdf
This thesis investigates the parameterized computational complexity of six classic graph problems lifted to a temporal setting. More specifically, we consider problems defined on temporal graphs, that is, a graph where the edge set may change over a discrete time interval, while the vertex set remains unchanged. Temporal graphs are well-suited to model dynamic data and hence they are naturally motivated in contexts where dynamic changes or time-dependent interactions play an important role, such as, for example, communication networks, social networks, or physical proximity networks. The most important selection criteria for our problems was that they are well-motivated in the context of dynamic data analysis. Since temporal graphs are mathematically more complex than static graphs, it is maybe not surprising that all problems we consider in this thesis are NP-hard. We focus on the development of exact algorithms, where our goal is to obtain fixed-parameter tractability results, and refined computational hardness reductions that either show NP-hardness for very restricted input instances or parameterized hardness with respect to “large” parameters. In the context of temporal graphs, we mostly consider structural parameters of the underlying graph, that is, the graph obtained by ignoring all time information. However, we also consider parameters of other types, such as ones trying to measure how fast the temporal graph changes over time. In the following we briefly discuss the problem setting and the main results. Restless Temporal Paths. A path in a temporal graph has to respect causality, or time, which means that the edges used by a temporal path have to appear at non-decreasing times. We investigate temporal paths that additionally have a maximum waiting time in every vertex of the temporal graph. Our main contributions are establishing NP-hardness for the problem of finding restless temporal paths even in very restricted cases, and showing W[1]-hardness with respect to the feedback vertex number of the underlying graph. Temporal Separators. A temporal separator is a vertex set that, when removed from the temporal graph, destroys all temporal paths between two dedicated vertices. Our contribution here is twofold: Firstly, we investigate the computational complexity of finding temporal separators in temporal unit interval graphs, a generalization of unit interval graphs to the temporal setting. We show that the problem is NP-hard on temporal unit interval graphs but we identify an additional restriction which makes the problem solvable in polynomial time. We use the latter result to develop a fixed-parameter algorithm with a “distance-to-triviality” parameterization. Secondly, we show that finding temporal separators that destroy all restless temporal paths is Σ-P-2-hard. Temporal Matchings. We introduce a model for matchings in temporal graphs, where, if two vertices are matched at some point in time, then they have to “recharge” afterwards, meaning that they cannot be matched again for a certain number of time steps. In our main result we employ temporal line graphs to show that finding matchings is NP-hard even on instances where the underlying graph is a path. Temporal Coloring. We lift the classic graph coloring problem to the temporal setting. In our model, every edge has to be colored properly (that is,the endpoints are colored differently) at least once in every time interval of a certain length. We show that this problem is NP-hard in very restricted cases, even if we only have two colors. We present simple exponential-time algorithms to solve this problem. As a main contribution, we show that these algorithms presumably cannot be improved significantly. Temporal Cliques and s-Plexes. We propose a model for temporal s-plexes that is a canonical generalization of an existing model for temporal cliques. Our main contribution is a fixed-parameter algorithm that enumerates all maximal temporal s-plexes in a given temporal graph, where we use a temporal adaptation of degeneracy as a parameter. Temporal Cluster Editing. We present a model for cluster editing in temporal graphs, where we want to edit all “layers” of a temporal graph into cluster graphs that are sufficiently similar. Our main contribution is a fixed-parameter algorithm with respect to the parameter “number of edge modifications” plus the “measure of similarity” of the resulting clusterings. We further show that there is an efficient preprocessing procedure that can provably reduce the size of the input instance to be independent of the number of vertices of the original input instance.
Author : Paul A. Cohen Publisher : Univ of California Press Page : 386 pages File Size : 49,9 Mb Release : 2010-05-11 Category : History ISBN : 9780520265837
The ancient story of King Goujian, a psychologically complex 5th-century BCE monarch, spoke powerfully to the Chinese during the 20th century, but remains little known in the West. This book explores the story's connections to the major traumas of the 20th century, and also considers why such stories remain unknown to outsiders.
Metaheuristics in Water, Geotechnical and Transport Engineering by Xin-She Yang,Amir Hossein Gandomi,Siamak Talatahari,Amir Hossein Alavi Pdf
Due to an ever-decreasing supply in raw materials and stringent constraints on conventional energy sources, demand for lightweight, efficient and low cost structures has become crucially important in modern engineering design. This requires engineers to search for optimal and robust design options to address design problems that are often large in scale and highly nonlinear, making finding solutions challenging. In the past two decades, metaheuristic algorithms have shown promising power, efficiency and versatility in solving these difficult optimization problems. This book examines the latest developments of metaheuristics and their applications in water, geotechnical and transport engineering offering practical case studies as examples to demonstrate real world applications. Topics cover a range of areas within engineering, including reviews of optimization algorithms, artificial intelligence, cuckoo search, genetic programming, neural networks, multivariate adaptive regression, swarm intelligence, genetic algorithms, ant colony optimization, evolutionary multiobjective optimization with diverse applications in engineering such as behavior of materials, geotechnical design, flood control, water distribution and signal networks. This book can serve as a supplementary text for design courses and computation in engineering as well as a reference for researchers and engineers in metaheursitics, optimization in civil engineering and computational intelligence. Provides detailed descriptions of all major metaheuristic algorithms with a focus on practical implementation Develops new hybrid and advanced methods suitable for civil engineering problems at all levels Appropriate for researchers and advanced students to help to develop their work
Jonathan Swift (1667 – 1745) A famous Anglo-Irish satirist, essayist, political pamphleteer, poet and cleric. Swift is mostly remembered for Gulliver's Travels, A Modest Proposal, A Journal to Stella and other works. His deadpan, ironic writing style has led to such satire being subsequently termed "Swiftian". Travels into Several Remote Nations of the World. In Four Parts. By Lemuel Gulliver, First a Surgeon, and then a Captain of Several Ships, commonly known as Gulliver's Travels (1726, amended 1735), is a prose satire both on human nature and the "travellers' tales" literary subgenre of the day. It is Swift's best known full-length work, and a classic of English literature.
