Workflow management systems support the execution of business processes: they require the modeling of the processes, they drive the actual enactment of process instances, and they document the business process execution. Many different modeling languages and systems have been developed for the design and representation of business processes and workflows as a consequence of different requirements, different purposes, as well as different schools and modeling philosophies. The differences are partly on a conceptual level in the sense that the modeling languages offer different concepts and constructs, and partly on the representation level where basically the same constructs are represented differently (e.g. text- or graph-based). This book makes two important contributions to workflow modeling. Firstly, it provides a metamodel based on abstract modeling concepts, which copes with representation differences of workflow descriptions. Secondly, it introduces a set of equivalence transformations on workflow models. Such transformations are an important tool for workflow developments as they allow representing workflows differently for different purposes. These transformations are used in algorithms for checking the satisfiability of temporal constraints in workflow definitions. Using this apparatus made it possible to develop a sophisticated time management system for workflows, which not only checks temporal constraints but can also be used to develop time plans for workflow execution.
The result of painstaking research by a renowned Sinologist, this compilation consists of over 3,100 biographical entries and detailed descriptions of individuals who used to play a decisive role in the People's Republic of China, including: -- Government officials, such as ministers or ambassadors -- Provincial cadres and cultural commissioners -- Party officials and functionaries of mass organizations Covering recently deceased personalities as well as figures who have retired, been exiled, disappeared, or withdrawn from public life for other reasons, Bartke has created an invaluable working tool for both historical and contemporary studies.
Cancer research is now an interdisciplinary effort requiring a basic knowledge of commonly used terms, facts, issues, and concepts. This interdisciplinary book meets this need, providing an authoritative overview to the field. It presents many of the molecules and mechanisms generally important in human cancers and examines a broad, but exemplary, selection of cancers. In addition, cancer research has now reached a critical stage, in which the accumulated knowledge on molecular mechanisms is gradually translated into improved prevention, diagnosis, and treatment. This book summarizes the state, pitfalls, and potential of these efforts.
Enduring legend of the old philosopher who sells his soul to the devil in exchange for knowledge and power, profoundly retold in poetic form by one of the giants of literature.
Concentration tendencies, globalization, increasing cost pressure and well-informed customers all make up the hard competition faced by today's businesses. The "right" products, a successful market image, a strong positioning between suppliers and customers, efficient logistics and optimum organization structures contribute to a company's survival. Achieving this goal requires flexible information and communication systems that are fully adaptable to the specific situation. Modern retail information systems are not bound by organization borders but support both business partner cooperation and electronic commerce. This book presents the architecture of retail information systems, as well as the functions of SAP Retail, and in so doing links modern retail management with the implementation strategies based on innovative software systems.
This book covers in a textbook-like fashion the basics or organic solar cells, addressing the limits of photovoltaic energy conversion and giving a well-illustrated introduction to molecular electronics with focus on the working principle and characterization of organic solar cells. Further chapters based on the author’s dissertation focus on the electrical processes in organic solar cells by presenting a detailed drift-diffusion approach to describe exciton separation and charge-carrier transport and extraction. The results, although elaborated on small-molecule solar cells and with focus on the zinc phthalocyanine: C60 material system, are of general nature. They propose and demonstrate experimental approaches for getting a deeper understanding of the dominating processes in amorphous thin-film based solar cells in general. The main focus is on the interpretation of the current-voltage characteristics (J-V curve). This very standard measurement technique for a solar cell reflects the electrical processes in the device. Comparing experimental to simulation data, the author discusses the reasons for S-Shaped J-V curves, the role of charge carrier mobilities and energy barriers at interfaces, the dominating recombination mechanisms, the charge carrier generation profile, and other efficiency-limiting processes in organic solar cells. The book concludes with an illustrative guideline on how to identify reasons for changes in the J-V curve. This book is a suitable introduction for students in engineering, physics, material science, and chemistry starting in the field of organic or hybrid thin-film photovoltaics. It is just as valuable for professionals and experimentalists who analyze solar cell devices.
This is the second edition of the book which has two additional new chapters on Maxwell’s equations as well as a section on properties of solution spaces of Maxwell’s equations and their trace spaces. These two new chapters, which summarize the most up-to-date results in the literature for the Maxwell’s equations, are sufficient enough to serve as a self-contained introductory book on the modern mathematical theory of boundary integral equations in electromagnetics. The book now contains 12 chapters and is divided into two parts. The first six chapters present modern mathematical theory of boundary integral equations that arise in fundamental problems in continuum mechanics and electromagnetics based on the approach of variational formulations of the equations. The second six chapters present an introduction to basic classical theory of the pseudo-differential operators. The aforementioned corresponding boundary integral operators can now be recast as pseudo-differential operators. These serve as concrete examples that illustrate the basic ideas of how one may apply the theory of pseudo-differential operators and their calculus to obtain additional properties for the corresponding boundary integral operators. These two different approaches are complementary to each other. Both serve as the mathematical foundation of the boundary element methods, which have become extremely popular and efficient computational tools for boundary problems in applications. This book contains a wide spectrum of boundary integral equations arising in fundamental problems in continuum mechanics and electromagnetics. The book is a major scholarly contribution to the modern approaches of boundary integral equations, and should be accessible and useful to a large community of advanced graduate students and researchers in mathematics, physics, and engineering.
Boundary value problems for partial differential equations playa crucial role in many areas of physics and the applied sciences. Interesting phenomena are often connected with geometric singularities, for instance, in mechanics. Elliptic operators in corresponding models are then sin gular or degenerate in a typical way. The necessary structures for constructing solutions belong to a particularly beautiful and ambitious part of the analysis. Cracks in a medium are described by hypersurfaces with a boundary. Config urations of that kind belong to the category of spaces (manifolds) with geometric singularities, here with edges. In recent years the analysis on such (in general, stratified) spaces has become a mathematical structure theory with many deep relations with geometry, topology, and mathematical physics. Key words in this connection are operator algebras, index theory, quantisation, and asymptotic analysis. Motivated by Lame's system with two-sided boundary conditions on a crack we ask the structure of solutions in weighted edge Sobolov spaces and subspaces with discrete and continuous asymptotics. Answers are given for elliptic sys tems in general. We construct parametrices of corresponding edge boundary value problems and obtain elliptic regularity in the respective scales of weighted spaces. The original elliptic operators as well as their parametrices belong to a block matrix algebra of pseudo-differential edge problems with boundary and edge conditions, satisfying analogues of the Shapiro-Lopatinskij condition from standard boundary value problems. Operators are controlled by a hierarchy of principal symbols with interior, boundary, and edge components.
This book describes an interactive statistical computing environment called 1 XploRe. As the name suggests, support for exploratory statistical analysis is given by a variety of computational tools. XploRe is a matrix-oriented statistical language with a comprehensive set of basic statistical operations that provides highly interactive graphics, as well as a programming environ ment for user-written macros; it offers hard-wired smoothing procedures for effective high-dimensional data analysis. Its highly dynamic graphic capa bilities make it possible to construct student-level front ends for teaching basic elements of statistics. Hot keys make it an easy-to-use computing environment for statistical analysis. The primary objective of this book is to show how the XploRe system can be used as an effective computing environment for a large number of statistical tasks. The computing tasks we consider range from basic data matrix manipulations to interactive customizing of graphs and dynamic fit ting of high-dimensional statistical models. The XploRe language is similar to other statistical languages and offers an interactive help system that can be extended to user-written algorithms. The language is intuitive and read ers with access to other systems can, without major difficulty, reproduce the examples presented here and use them as a basis for further investigation.
Der Band bietet 94 Briefe aus der Korrespondenz Bucers von Januar bis Juli 1534. Hier setzt sich die internationale Perspektive fort, die seit Mitte 1533 zu beobachten ist. Die evangelischen Korrespondenten betrachten die europapolitische Bündnispolitik skeptisch: Bucer rechnet im Januar 1534 damit, dass Papst Clemens VI. den englischen König Heinrich VIII. an sich binden wird, während die evangelischen Fürsten im Reich noch versuchen, mit Heinrich ein Bündnis zu schließen. Anfang Februar schätzt Bucer den französischen König milder ein, mit Sorge sieht er jedoch die Bemühungen Philipps von Hessen um Franz I. Im Blick auf die Schweiz versucht Bucer in Schaffhausen auch 1534 im Abendmahlsstreit der Ortsprediger zu vermitteln. Die Korrespondenz mit den Züricher Kollegen kreist um die innerevangelische Auseinandersetzung um die Sakramentstheologie und in diesem Zusammenhang die Person Luthers. Seit dem achttägigen Besuch Bucers bei den Blarers in Konstanz im April 1533 gewinnt der Plan Gestalt, eine Ausbildungsstätte für den theologischen Nachwuchs in Straßburg zu errichten. Hinsichtlich der Einführung der Reformation in Württemberg skizziert Bucer in einem Schreiben an Philipp von Hessen und Ulrich von Württemberg sein Konzept, in dessen Zentrum die friedliche Koexistenz der evangelischen Positionen steht. Seltene Einblicke gewährt die Korrespondenz in Bucers Familienleben.
TRENDS IN LINGUISTICS is a series of books that open new perspectives in our understanding of language. The series publishes state-of-the-art work on core areas of linguistics across theoretical frameworks, as well as studies that provide new insights by approaching language from an interdisciplinary perspective. TRENDS IN LINGUISTICS considers itself a forum for cutting-edge research based on solid empirical data on language in its various manifestations, including sign languages. It regards linguistic variation in its synchronic and diachronic dimensions as well as in its social contexts as important sources of insight for a better understanding of the design of linguistic systems and the ecology and evolution of language. TRENDS IN LINGUISTICS publishes monographs and outstanding dissertations as well as edited volumes, which provide the opportunity to address controversial topics from different empirical and theoretical viewpoints. High quality standards are ensured through anonymous reviewing. To discuss your book idea or submit a proposal, please contact Birgit Sievert.
Metadata is a key aspect of our evolving infrastructure for information management, social computing, and scientific collaboration. DC-2008 will focus on metadata challenges, solutions, and innovation in initiatives and activities underlying semantic and social applications. Metadata is part of the fabric of social computing, which includes the use of wikis, blogs, and tagging for collaboration and participation. Metadata also underlies the development of semantic applications, and the Semantic Web -- the representation and integration of multimedia knowledge structures on the basis of semantic models. These two trends flow together in applications such as Wikipedia, where authors collectively create structured information that can be extracted and used to enhance access to and use of information sources. Recent discussion has focused on how existing bibliographic standards can be expressed as Semantic Web vocabularies to facilitate the ingration of library and cultural heritage data with other types of data. Harnessing the efforts of content providers and end-users to link, tag, edit, and describe their information in interoperable ways (" participatory metadata") is a key step towards providing knowledge environments that are scalable, self-correcting, and evolvable. DC-2008 will explore conceptual and practical issues in the development and deployment of semantic and social applications to meet the needs of specific communities of practice.
Find an introduction to the architecture, concepts and algorithms of the Linux kernel in Professional Linux Kernel Architecture, a guide to the kernel sources and large number of connections among subsystems. Find an introduction to the relevant structures and functions exported by the kernel to userland, understand the theoretical and conceptual aspects of the Linux kernel and Unix derivatives, and gain a deeper understanding of the kernel. Learn how to reduce the vast amount of information contained in the kernel sources and obtain the skills necessary to understand the kernel sources.
Thermodynamics is the much abused slave of many masters • physicists who love the totally impractical Carnot process, • mechanical engineers who design power stations and refrigerators, • chemists who are successfully synthesizing ammonia and are puzzled by photosynthesis, • meteorologists who calculate cloud bases and predict föhn, boraccia and scirocco, • physico-chemists who vulcanize rubber and build fuel cells, • chemical engineers who rectify natural gas and distil f- mented potato juice, • metallurgists who improve steels and harden surfaces, • - trition counselors who recommend a proper intake of calories, • mechanics who adjust heat exchangers, • architects who construe – and often misconstrue – ch- neys, • biologists who marvel at the height of trees, • air conditioning engineers who design saunas and the ventilation of air plane cabins, • rocket engineers who create supersonic flows, et cetera. Not all of these professional groups need the full depth and breadth of ther- dynamics. For some it is enough to consider a well-stirred tank, for others a s- tionary nozzle flow is essential, and yet others are well-served with the partial d- ferential equation of heat conduction. It is therefore natural that thermodynamics is prone to mutilation; different group-specific meta-thermodynamics’ have emerged which serve the interest of the groups under most circumstances and leave out aspects that are not often needed in their fields.
One survivor tells of the fire-bombing of Dresden. Another survivor recounts the pervasive fear of marauding Russian and Czech bandits raping and killing. Children recall fathers who were only photographs and mothers who were saviors and heroes. These are typical in the stories collected in The War of Our Childhood: Memories of World War II. For this book Wolfgang W. E. Samuel, a childhood refugee himself after the fall of Nazi Germany, interviewed twenty-seven men and women who as children—by chance and sheer resilience—survived Allied bombs, invading armies, hunger, and chaos. “Our eyes carried no hate, only recognition of what was,” Samuel writes of his childhood. “Peace was an abstraction. The world we Kinder knew nearly always had the word ‘war’ appended to it.” Samuel's heartfelt narratives from these innocent survivors are invariably riveting and often terrifying. Each engrossing story has perilous and tragic moments—school children in Leuna who are sent home during an air raid but are strafed as moving targets; fathers who exist only as distant figures, returning to their families long after the war—or not at all; mothers who are raped and tortured; families who are forced into a seemingly endless relocation that replicates the terrors of war itself. In capturing such experiences from nearly every region of Germany and involving people of every socio-economic class, this is a collection of unique memories, but each account contributes to a cumulative understanding of the war that is more personal than strategic surveys and histories. For Samuel and the survivors he interviewed, agony and fright were part of everyday life, just as were play, wondrous experience, and above all perseverance. “My focus,” Samuel writes, “is on the astounding ability of a generation of German children to emerge from debilitating circumstances as sane and productive human beings.”
Viral Pathogenesis in Diagrams is the first book of its kind to illustrate viral pathogenesis on a comparative basis. The text covers the pathogenesis of viral diseases, including vertebrates, invertebrates, plants, and protists. The diagrams summarize and integrate large numbers of observations, from electron microscopy to clinical data, into a single picture or a few related drawings. Organized alphabetically by virus family or groups, this book covers the complete domain of virology. Transcending photographs and experimental data, the diagrams are ideally suited to illustrate the pathogenesis of viral diseases, from infection to host defenses and cell death. Included are two chapters describing general pathogenesis in vertebrate virus infections and illustrating the spread of viruses through the body, as well as cytopathology and host defenses. One chapter illustrates the pathogenic behavior of 19 vertebrate virus families, especially herpesviruses and retroviruses. The 268 diagrams in Viral Pathogenesis in Diagrams were selected from over 800 diagrams of English and French virological literature, including one derived from a famous drawing by Leonardo da Vinci. This up-to-date reference will promote understanding and future research.
Cancer research is now an interdisciplinary effort requiring a basic knowledge of commonly used terms, facts, issues, and concepts. This interdisciplinary book meets this need, providing an authoritative overview to the field. It presents many of the molecules and mechanisms generally important in human cancers and examines a broad, but exemplary, selection of cancers. In addition, cancer research has now reached a critical stage, in which the accumulated knowledge on molecular mechanisms is gradually translated into improved prevention, diagnosis, and treatment. This book summarizes the state, pitfalls, and potential of these efforts.
Magnetism is one of the oldest and most fundamental problems of Solid State Physics although not being fully understood up to now. On the other hand it is one of the hottest topics of current research. Practically all branches of modern technological developments are based on ferromagnetism, especially what concerns information technology. The book, written in a tutorial style, starts from the fundamental features of atomic magnetism, discusses the essentially single-particle problems of dia- and paramagnetism, in order to provide the basis for the exclusively interesting collective magnetism (ferro, ferri, antiferro). Several types of exchange interactions, which take care under certain preconditions for a collective ordering of localized or itinerant permanent magnetic moments, are worked out. Under which conditions these exchange interactions are able to provoke a collective moment ordering for finite temperatures is investigated within a series of theoretical models, each of them considered for a very special class of magnetic materials. The book is written in a tutorial style appropriate for those who want to learn magnetism and eventually to do research work in this field. Numerous exercises with full solutions for testing own attempts will help to a deep understanding of the main aspects of collective ferromagnetism.
Exceptionally fine poetry by Germany's greatest literary figure, from his earliest, "An den Schlaf" ("To Sleep"), written when he was 18, to his last great poem, "Verdächtnis" ("Legacy"), written when he was 80.
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