Professor Sir Tony Hoare Interviewed by Dr
Total Page:16
File Type:pdf, Size:1020Kb
Load more
Recommended publications
-
Edsger Dijkstra: the Man Who Carried Computer Science on His Shoulders
INFERENCE / Vol. 5, No. 3 Edsger Dijkstra The Man Who Carried Computer Science on His Shoulders Krzysztof Apt s it turned out, the train I had taken from dsger dijkstra was born in Rotterdam in 1930. Nijmegen to Eindhoven arrived late. To make He described his father, at one time the president matters worse, I was then unable to find the right of the Dutch Chemical Society, as “an excellent Aoffice in the university building. When I eventually arrived Echemist,” and his mother as “a brilliant mathematician for my appointment, I was more than half an hour behind who had no job.”1 In 1948, Dijkstra achieved remarkable schedule. The professor completely ignored my profuse results when he completed secondary school at the famous apologies and proceeded to take a full hour for the meet- Erasmiaans Gymnasium in Rotterdam. His school diploma ing. It was the first time I met Edsger Wybe Dijkstra. shows that he earned the highest possible grade in no less At the time of our meeting in 1975, Dijkstra was 45 than six out of thirteen subjects. He then enrolled at the years old. The most prestigious award in computer sci- University of Leiden to study physics. ence, the ACM Turing Award, had been conferred on In September 1951, Dijkstra’s father suggested he attend him three years earlier. Almost twenty years his junior, I a three-week course on programming in Cambridge. It knew very little about the field—I had only learned what turned out to be an idea with far-reaching consequences. a flowchart was a couple of weeks earlier. -
A Politico-Social History of Algolt (With a Chronology in the Form of a Log Book)
A Politico-Social History of Algolt (With a Chronology in the Form of a Log Book) R. w. BEMER Introduction This is an admittedly fragmentary chronicle of events in the develop ment of the algorithmic language ALGOL. Nevertheless, it seems perti nent, while we await the advent of a technical and conceptual history, to outline the matrix of forces which shaped that history in a political and social sense. Perhaps the author's role is only that of recorder of visible events, rather than the complex interplay of ideas which have made ALGOL the force it is in the computational world. It is true, as Professor Ershov stated in his review of a draft of the present work, that "the reading of this history, rich in curious details, nevertheless does not enable the beginner to understand why ALGOL, with a history that would seem more disappointing than triumphant, changed the face of current programming". I can only state that the time scale and my own lesser competence do not allow the tracing of conceptual development in requisite detail. Books are sure to follow in this area, particularly one by Knuth. A further defect in the present work is the relatively lesser availability of European input to the log, although I could claim better access than many in the U.S.A. This is regrettable in view of the relatively stronger support given to ALGOL in Europe. Perhaps this calmer acceptance had the effect of reducing the number of significant entries for a log such as this. Following a brief view of the pattern of events come the entries of the chronology, or log, numbered for reference in the text. -
Individual Mechanical Stimulation
Durham E-Theses Investigations into the structure and function of nerve and skeletal muscle of anisoptebous odonata, with special reference to aeschnid nymphs Malpus, C. M. How to cite: Malpus, C. M. (1968) Investigations into the structure and function of nerve and skeletal muscle of anisoptebous odonata, with special reference to aeschnid nymphs, Durham theses, Durham University. Available at Durham E-Theses Online: http://etheses.dur.ac.uk/8803/ Use policy The full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-prot purposes provided that: • a full bibliographic reference is made to the original source • a link is made to the metadata record in Durham E-Theses • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders. Please consult the full Durham E-Theses policy for further details. Academic Support Oce, Durham University, University Oce, Old Elvet, Durham DH1 3HP e-mail: [email protected] Tel: +44 0191 334 6107 http://etheses.dur.ac.uk 2 INVESTIGATIONS. INTO THE STRUCTURE AND FUNCTION OF NERVE. AND SKELETAL. MUSCLE OF ANISOPTEHOUS ODONATA, WITH SPECIAL REFERENCE TO AESCHNID NYMPHS by C. MV MALPUS, B.SC.. (Dunelm) GREY: COLLEGE:. Being a thesis presented in candidature for the degree of Doctor of Philosophy of the University of Durham. January 1968 PUBLICATION A preliminary report of some of this work, comprising the subject matter of Chapter k and part of Chapter 7, has been published under the title of "Electrical and Mechanical Responses of the skeletal muscle of a primitive insect"' in Nature 215, 991 - 992. -
Early Stored Program Computers
Stored Program Computers Thomas J. Bergin Computing History Museum American University 7/9/2012 1 Early Thoughts about Stored Programming • January 1944 Moore School team thinks of better ways to do things; leverages delay line memories from War research • September 1944 John von Neumann visits project – Goldstine’s meeting at Aberdeen Train Station • October 1944 Army extends the ENIAC contract research on EDVAC stored-program concept • Spring 1945 ENIAC working well • June 1945 First Draft of a Report on the EDVAC 7/9/2012 2 First Draft Report (June 1945) • John von Neumann prepares (?) a report on the EDVAC which identifies how the machine could be programmed (unfinished very rough draft) – academic: publish for the good of science – engineers: patents, patents, patents • von Neumann never repudiates the myth that he wrote it; most members of the ENIAC team contribute ideas; Goldstine note about “bashing” summer7/9/2012 letters together 3 • 1.0 Definitions – The considerations which follow deal with the structure of a very high speed automatic digital computing system, and in particular with its logical control…. – The instructions which govern this operation must be given to the device in absolutely exhaustive detail. They include all numerical information which is required to solve the problem…. – Once these instructions are given to the device, it must be be able to carry them out completely and without any need for further intelligent human intervention…. • 2.0 Main Subdivision of the System – First: since the device is a computor, it will have to perform the elementary operations of arithmetics…. – Second: the logical control of the device is the proper sequencing of its operations (by…a control organ. -
Optimizing the Block Cipher Resource Overhead at the Link Layer Security Framework in the Wireless Sensor Networks
Proceedings of the World Congress on Engineering 2008 Vol I WCE 2008, July 2 - 4, 2008, London, U.K. Optimizing the Block Cipher Resource Overhead at the Link Layer Security Framework in the Wireless Sensor Networks Devesh C. Jinwala, Dhiren R. Patel and Kankar S. Dasgupta, data collected from different sensor nodes. Since the Abstract—The security requirements in Wireless Sensor processing of the data is done on-the-fly, while being Networks (WSNs) and the mechanisms to support the transmitted to the base station; the overall communication requirements, demand a critical examination. Therefore, the costs are reduced [2]. Due to the multi-hop communication security protocols employed in WSNs should be so designed, as and the in-network processing demanding applications, the to yield the optimum performance. The efficiency of the block cipher is, one of the important factors in leveraging the conventional end-to-end security mechanisms are not performance of any security protocol. feasible for the WSN [3]. Hence, the use of the standard In this paper, therefore, we focus on the issue of optimizing end-to-end security protocols like SSH, SSL [4] or IPSec [5] the security vs. performance tradeoff in the security protocols in WSN environment is rejected. Instead, appropriate link in WSNs. As part of the exercise, we evaluate the storage layer security architecture, with low associated overhead is requirements of the block ciphers viz. the Advanced Encryption required. Standard (AES) cipher Rijndael, the Corrected Block Tiny Encryption Algorithm (XXTEA) using the Output Codebook There are a number of research attempts that aim to do so. -
The Advent of Recursion & Logic in Computer Science
The Advent of Recursion & Logic in Computer Science MSc Thesis (Afstudeerscriptie) written by Karel Van Oudheusden –alias Edgar G. Daylight (born October 21st, 1977 in Antwerpen, Belgium) under the supervision of Dr Gerard Alberts, and submitted to the Board of Examiners in partial fulfillment of the requirements for the degree of MSc in Logic at the Universiteit van Amsterdam. Date of the public defense: Members of the Thesis Committee: November 17, 2009 Dr Gerard Alberts Prof Dr Krzysztof Apt Prof Dr Dick de Jongh Prof Dr Benedikt Löwe Dr Elizabeth de Mol Dr Leen Torenvliet 1 “We are reaching the stage of development where each new gener- ation of participants is unaware both of their overall technological ancestry and the history of the development of their speciality, and have no past to build upon.” J.A.N. Lee in 1996 [73, p.54] “To many of our colleagues, history is only the study of an irrele- vant past, with no redeeming modern value –a subject without useful scholarship.” J.A.N. Lee [73, p.55] “[E]ven when we can't know the answers, it is important to see the questions. They too form part of our understanding. If you cannot answer them now, you can alert future historians to them.” M.S. Mahoney [76, p.832] “Only do what only you can do.” E.W. Dijkstra [103, p.9] 2 Abstract The history of computer science can be viewed from a number of disciplinary perspectives, ranging from electrical engineering to linguistics. As stressed by the historian Michael Mahoney, different `communities of computing' had their own views towards what could be accomplished with a programmable comput- ing machine. -
Simula Mother Tongue for a Generation of Nordic Programmers
Simula! Mother Tongue! for a Generation of! Nordic Programmers! Yngve Sundblad HCI, CSC, KTH! ! KTH - CSC (School of Computer Science and Communication) Yngve Sundblad – Simula OctoberYngve 2010Sundblad! Inspired by Ole-Johan Dahl, 1931-2002, and Kristen Nygaard, 1926-2002" “From the cold waters of Norway comes Object-Oriented Programming” " (first line in Bertrand Meyer#s widely used text book Object Oriented Software Construction) ! ! KTH - CSC (School of Computer Science and Communication) Yngve Sundblad – Simula OctoberYngve 2010Sundblad! Simula concepts 1967" •# Class of similar Objects (in Simula declaration of CLASS with data and actions)! •# Objects created as Instances of a Class (in Simula NEW object of class)! •# Data attributes of a class (in Simula type declared as parameters or internal)! •# Method attributes are patterns of action (PROCEDURE)! •# Message passing, calls of methods (in Simula dot-notation)! •# Subclasses that inherit from superclasses! •# Polymorphism with several subclasses to a superclass! •# Co-routines (in Simula Detach – Resume)! •# Encapsulation of data supporting abstractions! ! KTH - CSC (School of Computer Science and Communication) Yngve Sundblad – Simula OctoberYngve 2010Sundblad! Simula example BEGIN! REF(taxi) t;" CLASS taxi(n); INTEGER n;! BEGIN ! INTEGER pax;" PROCEDURE book;" IF pax<n THEN pax:=pax+1;! pax:=n;" END of taxi;! t:-NEW taxi(5);" t.book; t.book;" print(t.pax)" END! Output: 7 ! ! KTH - CSC (School of Computer Science and Communication) Yngve Sundblad – Simula OctoberYngve 2010Sundblad! -
Submission Data for 2020-2021 CORE Conference Ranking Process International Symposium on Formal Methods (Was Formal Methods Europe FME)
Submission Data for 2020-2021 CORE conference Ranking process International Symposium on Formal Methods (was Formal Methods Europe FME) Ana Cavalcanti, Stefania Gnesi, Lars-Henrik Eriksson, Nico Plat, Einar Broch Johnsen, Maurice ter Beek Conference Details Conference Title: International Symposium on Formal Methods (was Formal Methods Europe FME) Acronym : FM Rank: A Data and Metrics Google Scholar Metrics sub-category url: https://scholar.google.com.au/citations?view_op=top_venues&hl=en&vq=eng_theoreticalcomputerscienceposition in sub-category: 20+Image of top 20: ACM Metrics Not Sponsored by ACM Aminer Rank 1 Aminer Rank: 28Name in Aminer: World Congress on Formal MethodsAcronym or Shorthand: FMh-5 Index: 17CCF: BTHU: âĂŞ Top Aminer Cites: http://portal.core.edu.au/core/media/conf_submissions_citations/extra_info1804_aminer_top_cite.png Other Rankings Not aware of any other Rankings Conferences in area: 1. Formal Methods Symposium (FM) 2. Software Engineering and Formal Methods (SEFM), Integrated Formal Methods (IFM) 3. Fundamental Approaches to Software Engineering (FASE), NASA Formal Methods (NFM), Runtime Verification (RV) 4. Formal Aspects of Component Software (FACS), Automated Technology for Verification and Analysis (ATVA) 5. International Conference on Formal Engineering Methods (ICFEM), FormaliSE, Formal Methods in Computer-Aided Design (FMCAD), Formal Methods for Industrial Critical Systems (FMICS) 6. Brazilian Symposium on Formal Methods (SBMF), Theoretical Aspects of Software Engineering (TASE) 7. International Symposium On Leveraging Applications of Formal Methods, Verification and Validation (ISoLA) Top People Publishing Here name: Frank de Boer justification: h-index: 42 ( https://www.cwi.nl/people/frank-de-boer) Frank S. de Boer is senior researcher at the CWI, where he leads the research group on Formal Methods, and Professor of Software Correctness at Leiden University, The Netherlands. -
Part I Background
Cambridge University Press 978-0-521-19746-5 - Transitions and Trees: An Introduction to Structural Operational Semantics Hans Huttel Excerpt More information PART I BACKGROUND © in this web service Cambridge University Press www.cambridge.org Cambridge University Press 978-0-521-19746-5 - Transitions and Trees: An Introduction to Structural Operational Semantics Hans Huttel Excerpt More information 1 A question of semantics The goal of this chapter is to give the reader a glimpse of the applications and problem areas that have motivated and to this day continue to inspire research in the important area of computer science known as programming language semantics. 1.1 Semantics is the study of meaning Programming language semantics is the study of mathematical models of and methods for describing and reasoning about the behaviour of programs. The word semantics has Greek roots1 and was first used in linguistics. Here, one distinguishes among syntax, the study of the structure of lan- guages, semantics, the study of meaning, and pragmatics, the study of the use of language. In computer science we make a similar distinction between syntax and se- mantics. The languages that we are interested in are programming languages in a very general sense. The ‘meaning’ of a program is its behaviour, and for this reason programming language semantics is the part of programming language theory devoted to the study of program behaviour. Programming language semantics is concerned only with purely internal aspects of program behaviour, namely what happens within a running pro- gram. Program semantics does not claim to be able to address other aspects of program behaviour – e.g. -
The Standard Model for Programming Languages: the Birth of A
The Standard Model for Programming Languages: The Birth of a Mathematical Theory of Computation Simone Martini Department of Computer Science and Engineering, University of Bologna, Italy INRIA, Sophia-Antipolis, Valbonne, France http://www.cs.unibo.it/~martini [email protected] Abstract Despite the insight of some of the pioneers (Turing, von Neumann, Curry, Böhm), programming the early computers was a matter of fiddling with small architecture-dependent details. Only in the sixties some form of “mathematical program development” will be in the agenda of some of the most influential players of that time. A “Mathematical Theory of Computation” is the name chosen by John McCarthy for his approach, which uses a class of recursively computable functions as an (extensional) model of a class of programs. It is the beginning of that grand endeavour to present programming as a mathematical activity, and reasoning on programs as a form of mathematical logic. An important part of this process is the standard model of programming languages – the informal assumption that the meaning of programs should be understood on an abstract machine with unbounded resources, and with true arithmetic. We present some crucial moments of this story, concluding with the emergence, in the seventies, of the need of more “intensional” semantics, like the sequential algorithms on concrete data structures. The paper is a small step of a larger project – reflecting and tracing the interaction between mathematical logic and programming (languages), identifying some -
The Structure and Stability of Simple Tri-Iodides
THE STRUCTURE AND STABILITY OF SIMPLE TRI -IODIDES by ANTHONY JOHN THOMPSON FINNEY B.Sc.(Hons.) submitted in fulfilment of the requirements for the Degree of Doctor of Philosophy UNIVERSITY OF TASMANIA HOBART OCTOBER, 1973 . r " • f (i) Frontispiece (reproduced as Plate 6 - 1, Chapter 1) - two views of a large single crystal of KI 3 .H20. The dimensions of this specimen were approximately 3.0 cm x 1.5 cm x 0.5 cm. • - - . ;or • - This thesis contains no material which has been accepted for the award of any other degree or diploma in any University, and to the best of my knowledge and belief, this thesis contains no copy or paraphrase of material previously published or written by another person, except where reference is made in the text of this thesis. Anthony John Finney Contents page Abstract (iv) Acknowledgements (vii) Chapter 1 - The Structure and Stability of Simple 1 Tri-iodides Chapter 2 - The Theoretical Basis of X-Ray Structural 32 Analysis Chapter 3 - The Crystallographic Program Suite 50 Chapter 4 - The Refinement of the Structure of NH I 94 4 3 Chapter 5 - The Solution of the Structure of RbI 115 3 Chapter 6 - The Solution of the Structure of KI 3 .1120 135 Chapter 7 Discussion of the Inter-relation of 201 Structure and Stability Bibliography 255 Appendix A - Programming Details 267 Appendix B - Density Determinations 286 Appendix C - Derivation of the Unit Cell Constants of 292 KI .H 0 3 2 Appendix D - I -3 force constant Calculation 299 Appendix E - Publications 311 ( iv) THE STRUCTURE AND STABILITY OF SIMPLE TRI-IODIDES Abstract In this work the simple tri-iodides are regarded as being those in which the crystal lattice contains only cations, tri-iodide anions and possibly solvate molecules. -
TCM Report, Summer
Board of Directors Corporate Donors Contributing Members John William Poduska. Sr. Benefactor-$lO.ooo or more Pathway Design. Inc. Patron-$SOO or more Chairman and CEO AFIPS. Inc." PC Magazine Anonymous. Ray Duncan. Tom Eggers. Belmont Computer. Inc. American Exr.ress Foundation Peat. Marwick. Mitchell & Co. Alan E. Frisbie. Tom and Rosemarie American Te ephone & Telegraph Co." Pell. Rudman. Inc. Hall. Andrew Lavien. Nicholas and Gwen Bell. President Apollo Computer. Inc." Pencept. Inc. Nancy Petti nella. Paul R. Pierce. The Computer Museum Bank of America" Polese-Clancy. Inc. Jonathan Rotenberg. Oliver and Kitty Erich Bloch The Boston Globe" Price Waterhouse Selfridge. J. Michael Storie. Bob National Science Foundation ComputerLand" Project Software & Development. Inc. Whelan. Leo R. Yochim Control Data Corporation" Shawmut Corporation David Donaldson Data General Corporation" Standard Oil Corporation Sponsor-$250 Ropes and Gray Digital Equipment Corporation" Teradyne Hewlett-Packard Warner & Stackpole Isaac Auerbach. G. C . Beldon. Jr .. Sydney Fernbach Philip D. Brooke. Richard J. Clayton. Computer Consultant International Data Group" XRE Corporation International Business Machines. Inc." " Contributed to the Capital Campaign Richard Corben. Howard E. Cox. Jr .. C. Lester Hogan The MITRE Corporation" Lucien and Catherine Dimino. Philip H. Fairchild Camera and Instrument NEC Corporation" Darn. Dan L. Eisner. Bob O. Evans. Corporation Raytheon Company Branko Gerovac. Dr. Roberto Guatelli. Sanders Associates M. Ernest Huber. Lawrence J. Kilgallen. Arthur Humphreys The Travelers Companies Core Members Martin Kirkpatrick. Marian Kowalski. ICL Wang Laboratories. Inc." Raymond Kurzweil. Michael Levitt. Carl Theodore G. Johnson Harlan E. and Lois Anderson Machover. Julius Marcus. Joe W .. Charles and Constance Bachman Matthews. Tron McConnell.