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David Luckham Is the Keynote Speaker at Pen,” He Says
45-iAGEJul-Influ 14/7/04 4:02 pm Page 45 PERSPECTIVE INFLUENCER Man of events or the first year after David vision. As they do so, they will undoubt- Luckham’s book, The Power of Events, edly turn to Luckham’s book for a was published in 2002, it did what grounding in the design principles. F Power of Events most technical books do: disappeared The is based on years of into the academic ether. The publishers, research work at Stanford and two years he says, didn’t promote it at all, and its as CTO of a software start-up working in technical nature put it beyond the reach the field. The book is a technical mani- of most readers. festo for CEP – the ability of systems to As a result, it looked like the ‘event- recognise and respond to complex, inter- driven revolution’, of which the Stanford related events in real time. University Emeritus Professor is the lead- Luckham has spent 22 years as a ing and most passionate advocate, would Professor of Electrical Engineering at be postponed for a few years more. Stanford, and many years before that Stanford University But then, in mid-2003, two important doing ground-breaking work at Emeritus Professor David US technical journals gave the book Harvard, Stanford, UCLA and MIT. But highly positive reviews, and interest his presentations, and the first half of Luckham has spent began to grow. Sales began to rise, at first his book, at least, are in plain English, decades studying event slowly, then dramatically. Luckham star- full of clear examples of why CEP will processing. -
A Networked Robotic System and Its Use in an Oil Spill Monitoring Exercise
A Networked Robotic System and its Use in an Oil Spill Monitoring Exercise El´oiPereira∗† Co-authors: Pedro Silvay, Clemens Krainerz, Christoph Kirschz, Jos´eMorgadoy, and Raja Sengupta∗ cpcc.berkeley.edu, eloipereira.com [email protected] Swarm at the Edge of the Could - ESWeek'13, Montreal, Canada September 29, 2013 ∗ - Systems Engineering, UC Berkeley y - Research Center, Portuguese Air Force Academy z - Computer Science Dept., University of Salzburg Programming the Ubiquitous World • In networked mobile systems (e.g. teams of robots, smartphones, etc.) the location and connectivity of \machines" may vary during the execution of its \programs" (computation specifications) • We investigate models for bridging \programs" and \machines" with dynamic structure (location and connectivity) • BigActors [PKSBdS13, PPKS13, PS13] are actors [Agh86] hosted by entities of the physical structure denoted as bigraph nodes [Mil09] E. Pereira, C. M. Kirsch, R. Sengupta, and J. B. de Sousa, \Bigactors - A Model for Structure-aware Computation," in ACM/IEEE 4th International Conference on Cyber-Physical Systems, 2013, pp. 199-208. Case study: Oil spill monitoring scenario • \Bilge dumping" is an environmental problem of great relevance for countries with large area of jurisdictional waters • EC created the European Maritime Safety Agency to \...prevent and respond to pollution by ships within the EU" • How to use networked robotics to monitor and take evidences of \bilge dumping" Figure: Portuguese Jurisdiction waters and evidences of \Bilge dumping". -
A Closer Look at the Sorption Behavior of Nonionic Surfactants in Marine Sediment
A closer look at the sorption behavior of nonionic surfactants in marine sediment Steven Droge Droge, S. / A closer look at the sorption behavior of nonionic surfactants in marine sediment. PhD thesis, 2008, Institute for Risk Assessment Sciences (IRAS), Utrecht University, The Netherlands ISBN 978-90-393-4774-4 Printed by Ridderprint Cover picture: The Great Wave off Kanagawa by Hokusai (ca. 1830-32) Design by Martijn Dorresteijn A closer look at the sorption behavior of nonionic surfactants in marine sediment Een nadere beschouwing van het sorptiegedrag van niet-ionogene oppervlakte-aktieve stoffen in marien sediment (met een samenvatting in het Nederlands) Proefschrift ter verkrijging van de graad van doctor aan de Universiteit Utrecht op gezag van de rector magnificus, prof.dr. J. C. Stoof, ingevolge het besluit van het college voor promoties in het openbaar te verdedigen op dinsdag 25 maart 2008 des middags te 4.15 uur door Stefanus Theodorus Johannes Droge geboren op 19 februari 1978 te Alkmaar Promotor: Prof.dr. W. Seinen Co-promotor: Dr. J. L. M. Hermens The research described in this thesis was financially supported by ERASM (Environmental Risk Assessment and Management), a joint platform of the European detergent and surfactants producers [A.I.S.E (Association Internationale de la Savonnerie, de la Détergence et des Produits d’Entretien) and CESIO (Comité Européen des Agents Surface et de leurs Intermédiaires Organiques)] CONTENTS Chapter 1 1 General Introduction Chapter 2 25 Analysis of Freely Dissolved Alcohol Ethoxylate Homologues -
The Space and Motion of Communicating Agents
The space and motion of communicating agents Robin Milner December 1, 2008 ii to my family: Lucy, Barney, Chloe,¨ and in memory of Gabriel iv Contents Prologue vii Part I : Space 1 1 The idea of bigraphs 3 2 Defining bigraphs 15 2.1 Bigraphsandtheirassembly . 15 2.2 Mathematicalframework . 19 2.3 Bigraphicalcategories . 24 3 Algebra for bigraphs 27 3.1 Elementarybigraphsandnormalforms. 27 3.2 Derivedoperations ........................... 31 4 Relative and minimal bounds 37 5 Bigraphical structure 43 5.1 RPOsforbigraphs............................ 43 5.2 IPOsinbigraphs ............................ 48 5.3 AbstractbigraphslackRPOs . 53 6 Sorting 55 6.1 PlacesortingandCCS ......................... 55 6.2 Linksorting,arithmeticnetsandPetrinets . ..... 60 6.3 Theimpactofsorting .......................... 64 Part II : Motion 66 7 Reactions and transitions 67 7.1 Reactivesystems ............................ 68 7.2 Transitionsystems ........................... 71 7.3 Subtransitionsystems .. .... ... .... .... .... .... 76 v vi CONTENTS 7.4 Abstracttransitionsystems . 77 8 Bigraphical reactive systems 81 8.1 DynamicsforaBRS .......................... 82 8.2 DynamicsforaniceBRS.... ... .... .... .... ... .. 87 9 Behaviour in link graphs 93 9.1 Arithmeticnets ............................. 93 9.2 Condition-eventnets .. .... ... .... .... .... ... .. 95 10 Behavioural theory for CCS 103 10.1 SyntaxandreactionsforCCSinbigraphs . 103 10.2 TransitionsforCCSinbigraphs . 107 Part III : Development 113 11 Further topics 115 11.1Tracking................................ -
The Origins of Structural Operational Semantics
The Origins of Structural Operational Semantics Gordon D. Plotkin Laboratory for Foundations of Computer Science, School of Informatics, University of Edinburgh, King’s Buildings, Edinburgh EH9 3JZ, Scotland I am delighted to see my Aarhus notes [59] on SOS, Structural Operational Semantics, published as part of this special issue. The notes already contain some historical remarks, but the reader may be interested to know more of the personal intellectual context in which they arose. I must straightaway admit that at this distance in time I do not claim total accuracy or completeness: what I write should rather be considered as a reconstruction, based on (possibly faulty) memory, papers, old notes and consultations with colleagues. As a postgraduate I learnt the untyped λ-calculus from Rod Burstall. I was further deeply impressed by the work of Peter Landin on the semantics of pro- gramming languages [34–37] which includes his abstract SECD machine. One should also single out John McCarthy’s contributions [45–48], which include his 1962 introduction of abstract syntax, an essential tool, then and since, for all approaches to the semantics of programming languages. The IBM Vienna school [42, 41] were interested in specifying real programming languages, and, in particular, worked on an abstract interpreting machine for PL/I using VDL, their Vienna Definition Language; they were influenced by the ideas of McCarthy, Landin and Elgot [18]. I remember attending a seminar at Edinburgh where the intricacies of their PL/I abstract machine were explained. The states of these machines are tuples of various kinds of complex trees and there is also a stack of environments; the transition rules involve much tree traversal to access syntactical control points, handle jumps, and to manage concurrency. -
Curriculum Vitae Thomas A
Curriculum Vitae Thomas A. Henzinger February 6, 2021 Address IST Austria (Institute of Science and Technology Austria) Phone: +43 2243 9000 1033 Am Campus 1 Fax: +43 2243 9000 2000 A-3400 Klosterneuburg Email: [email protected] Austria Web: pub.ist.ac.at/~tah Research Mathematical logic, automata and game theory, models of computation. Analysis of reactive, stochastic, real-time, and hybrid systems. Formal software and hardware verification, especially model checking. Design and implementation of concurrent and embedded software. Executable modeling of biological systems. Education September 1991 Ph.D., Computer Science Stanford University July 1987 Dipl.-Ing., Computer Science Kepler University, Linz August 1986 M.S., Computer and Information Sciences University of Delaware Employment September 2009 President IST Austria April 2004 to Adjunct Professor, University of California, June 2011 Electrical Engineering and Computer Sciences Berkeley April 2004 to Professor, EPFL August 2009 Computer and Communication Sciences January 1999 to Director Max-Planck Institute March 2000 for Computer Science, Saarbr¨ucken July 1998 to Professor, University of California, March 2004 Electrical Engineering and Computer Sciences Berkeley July 1997 to Associate Professor, University of California, June 1998 Electrical Engineering and Computer Sciences Berkeley January 1996 to Assistant Professor, University of California, June 1997 Electrical Engineering and Computer Sciences Berkeley January 1992 to Assistant Professor, Cornell University December 1996 Computer Science October 1991 to Postdoctoral Scientist, Universit´eJoseph Fourier, December 1991 IMAG Laboratory Grenoble 1 Honors Member, US National Academy of Sciences, 2020. Member, American Academy of Arts and Sciences, 2020. ESWEEK (Embedded Systems Week) Test-of-Time Award, 2020. LICS (Logic in Computer Science) Test-of-Time Award, 2020. -
The Computational Attitude in Music Theory
The Computational Attitude in Music Theory Eamonn Bell Submitted in partial fulfillment of the requirements for the degree of Doctor of Philosophy in the Graduate School of Arts and Sciences COLUMBIA UNIVERSITY 2019 © 2019 Eamonn Bell All rights reserved ABSTRACT The Computational Attitude in Music Theory Eamonn Bell Music studies’s turn to computation during the twentieth century has engendered particular habits of thought about music, habits that remain in operation long after the music scholar has stepped away from the computer. The computational attitude is a way of thinking about music that is learned at the computer but can be applied away from it. It may be manifest in actual computer use, or in invocations of computationalism, a theory of mind whose influence on twentieth-century music theory is palpable. It may also be manifest in more informal discussions about music, which make liberal use of computational metaphors. In Chapter 1, I describe this attitude, the stakes for considering the computer as one of its instruments, and the kinds of historical sources and methodologies we might draw on to chart its ascendance. The remainder of this dissertation considers distinct and varied cases from the mid-twentieth century in which computers or computationalist musical ideas were used to pursue new musical objects, to quantify and classify musical scores as data, and to instantiate a generally music-structuralist mode of analysis. I present an account of the decades-long effort to prepare an exhaustive and accurate catalog of the all-interval twelve-tone series (Chapter 2). This problem was first posed in the 1920s but was not solved until 1959, when the composer Hanns Jelinek collaborated with the computer engineer Heinz Zemanek to jointly develop and run a computer program. -
Purely Functional Data Structures
Purely Functional Data Structures Chris Okasaki September 1996 CMU-CS-96-177 School of Computer Science Carnegie Mellon University Pittsburgh, PA 15213 Submitted in partial fulfillment of the requirements for the degree of Doctor of Philosophy. Thesis Committee: Peter Lee, Chair Robert Harper Daniel Sleator Robert Tarjan, Princeton University Copyright c 1996 Chris Okasaki This research was sponsored by the Advanced Research Projects Agency (ARPA) under Contract No. F19628- 95-C-0050. The views and conclusions contained in this document are those of the author and should not be interpreted as representing the official policies, either expressed or implied, of ARPA or the U.S. Government. Keywords: functional programming, data structures, lazy evaluation, amortization For Maria Abstract When a C programmer needs an efficient data structure for a particular prob- lem, he or she can often simply look one up in any of a number of good text- books or handbooks. Unfortunately, programmers in functional languages such as Standard ML or Haskell do not have this luxury. Although some data struc- tures designed for imperative languages such as C can be quite easily adapted to a functional setting, most cannot, usually because they depend in crucial ways on as- signments, which are disallowed, or at least discouraged, in functional languages. To address this imbalance, we describe several techniques for designing functional data structures, and numerous original data structures based on these techniques, including multiple variations of lists, queues, double-ended queues, and heaps, many supporting more exotic features such as random access or efficient catena- tion. In addition, we expose the fundamental role of lazy evaluation in amortized functional data structures. -
Insight, Inspiration and Collaboration
Chapter 1 Insight, inspiration and collaboration C. B. Jones, A. W. Roscoe Abstract Tony Hoare's many contributions to computing science are marked by insight that was grounded in practical programming. Many of his papers have had a profound impact on the evolution of our field; they have moreover provided a source of inspiration to several generations of researchers. We examine the development of his work through a review of the development of some of his most influential pieces of work such as Hoare logic, CSP and Unifying Theories. 1.1 Introduction To many who know Tony Hoare only through his publications, they must often look like polished gems that come from a mind that rarely makes false steps, nor even perhaps has to work at their creation. As so often, this impres- sion is a further compliment to someone who actually adds to very hard work and many discarded attempts the final polish that makes complex ideas rel- atively easy for the reader to comprehend. As indicated on page xi of [HJ89], his ideas typically go through many revisions. The two authors of the current paper each had the honour of Tony Hoare supervising their doctoral studies in Oxford. They know at first hand his kind and generous style and will count it as an achievement if this paper can convey something of the working style of someone big enough to eschew competition and point scoring. Indeed it will be apparent from the following sections how often, having started some new way of thinking or exciting ideas, he happily leaves their exploration and development to others. -
Parallel Programming by Transformation
Universidade do Minho Escola de Engenharia Davide Rua Carneiro An agent-based architecture for online Universidade do Minho dispute resolutionEscola services de Engenharia Parallel Programming by Transformation Rui Carlos Ara´ujoGon¸calves The MAP Doctoral Program in Computer Science The MAP-i Doctoral Program of the of the Universities of Minho, Aveiro and Porto Universities of Minho, Aveiro and Porto universidade de aveiro Universidade do Minho Supervisors: Professor Jo~aoLu´ısFerreira Sobral A thesisProfessor submitted Don Batory at the University of Minho for the degree of Doctor of Philosophy in Informatics (PhD) underApril 2015the supervision of Paulo Jorge Freitas de Oliveira Novais and José Carlos Ferreira Maia Neves July 2013 Acknowledgments Several people contributed to this journey that now is about to end. Among my family, friends, professors, etc., it is impossible to list all who helped me over the years. Nevertheless, I want to highlight some people that had a key role in the success of this journey. I would like to thank Professor Jo~aoLu´ısSobral, for bringing me into this world, for pushing me into pursuing a PhD, and for the comments and directions provided. I would like thank Professor Don Batory, for everything he taught me over these years, and for being always available to discuss my work and to share his expertise with me. I will be forever grateful for all the guidance and insights he provided me, which were essential to the conclusion of this work. I would like to thank the people I had the opportunity to work with at the University of Texas at Austin, in particular Professor Robert van de Geijn, Bryan Marker, and Taylor Rich´e,for the important contributions they gave to this work. -
Origins of the American Association for Artificial Intelligence
AI Magazine Volume 26 Number 4 (2006)(2005) (© AAAI) 25th Anniversary Issue The Origins of the American Association for Artificial Intelligence (AAAI) Raj Reddy ■ This article provides a historical background on how AAAI came into existence. It provides a ratio- nale for why we needed our own society. It pro- vides a list of the founding members of the com- munity that came together to establish AAAI. Starting a new society comes with a whole range of issues and problems: What will it be called? How will it be financed? Who will run the society? What kind of activities will it engage in? and so on. This article provides a brief description of the consider- ations that went into making the final choices. It also provides a description of the historic first AAAI conference and the people that made it happen. The Background and the Context hile the 1950s and 1960s were an ac- tive period for research in AI, there Wwere no organized mechanisms for the members of the community to get together and share ideas and accomplishments. By the early 1960s there were several active research groups in AI, including those at Carnegie Mel- lon University (CMU), the Massachusetts Insti- tute of Technology (MIT), Stanford University, Stanford Research Institute (later SRI Interna- tional), and a little later the University of Southern California Information Sciences Insti- tute (USC-ISI). My own involvement in AI began in 1963, when I joined Stanford as a graduate student working with John McCarthy. After completing my Ph.D. in 1966, I joined the faculty at Stan- ford as an assistant professor and stayed there until 1969 when I left to join Allen Newell and Herb Simon at Carnegie Mellon University Raj Reddy. -
The EATCS Award 2020 Laudatio for Toniann (Toni)Pitassi
The EATCS Award 2020 Laudatio for Toniann (Toni)Pitassi The EATCS Award 2021 is awarded to Toniann (Toni) Pitassi University of Toronto, as the recipient of the 2021 EATCS Award for her fun- damental and wide-ranging contributions to computational complexity, which in- cludes proving long-standing open problems, introducing new fundamental mod- els, developing novel techniques and establishing new connections between dif- ferent areas. Her work is very broad and has relevance in computational learning and optimisation, verification and SAT-solving, circuit complexity and communi- cation complexity, and their applications. The first notable contribution by Toni Pitassi was to develop lifting theorems: a way to transfer lower bounds from the (much simpler) decision tree model for any function f, to a lower bound, the much harder communication complexity model, for a simply related (2-party) function f’. This has completely transformed our state of knowledge regarding two fundamental computational models, query algorithms (decision trees) and communication complexity, as well as their rela- tionship and applicability to other areas of theoretical computer science. These powerful and flexible techniques resolved numerous open problems (e.g., the su- per quadratic gap between probabilistic and quantum communication complex- ity), many of which were central challenges for decades. Toni Pitassi has also had a remarkable impact in proof complexity. She in- troduced the fundamental algebraic Nullstellensatz and Ideal proof systems, and the geometric Stabbing Planes system. She gave the first nontrivial lower bounds on such long-standing problems as weak pigeon-hole principle and models like constant-depth Frege proof systems. She has developed new proof techniques for virtually all proof systems, and new SAT algorithms.