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Actor Model Later History
In computer science, the Actor model, first published in 1973 , is a mathematical model of concurrent computation. This article reports on the later history of the Actor model in which major themes were investigation of the basic power of the model, study of issues of compositionality, development of architectures, and application to Open systems. It is the follow on article to Actor model middle history which reports on the initial implementations, initial applications, and development of the first proof theory and denotational model. Power of the Actor Model Investigations began into the basic power of the Actor model. Carl Hewitt [1985] argued that because of the use of Arbiter (electronics), Arbiters that the Actor model was more powerful than logic programming (see indeterminacy in concurrent computation). A family of Prolog-like concurrent message passing systems using unification of shared variables and data structure streams for messages were developed by Keith Clark (co ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
Computer Science
Computer science is the study of computation, information, and automation. Computer science spans Theoretical computer science, theoretical disciplines (such as algorithms, theory of computation, and information theory) to Applied science, applied disciplines (including the design and implementation of Computer architecture, hardware and Software engineering, software). Algorithms and data structures are central to computer science. The theory of computation concerns abstract models of computation and general classes of computational problem, problems that can be solved using them. The fields of cryptography and computer security involve studying the means for secure communication and preventing security vulnerabilities. Computer graphics (computer science), Computer graphics and computational geometry address the generation of images. Programming language theory considers different ways to describe computational processes, and database theory concerns the management of re ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
Actor Model And Process Calculi
In computer science, the Actor model and process calculi are two closely related approaches to the modelling of concurrent digital computation. See Actor model and process calculi history. There are many similarities between the two approaches, but also several differences (some philosophical, some technical): *There is only one Actor model (although it has numerous formal systems for design, analysis, verification, modeling, ''etc.''); there are numerous process calculi, developed for reasoning about a variety of different kinds of concurrent systems at various levels of detail (including calculi that incorporate time, stochastic transitions, or constructs specific to application areas such as security analysis). *The Actor model was inspired by the laws of physics and depends on them for its fundamental axioms, ''i.e.'' physical laws (see Actor model theory); the process calculi were originally inspired by algebra . *Processes in the process calculi are anonymous, and communic ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
IEEE Micro
''IEEE Micro'' is a bimonthly peer-reviewed scientific journal published by the IEEE Computer Society covering small systems and semiconductor chips, including integrated circuit processes and practices, project management, development tools and infrastructure, as well as chip design and architecture, empirical evaluations of small system and IC technologies and techniques, and human and social aspects of system development. Editors-in-chief The following people are or have been editor-in-chief: * 2024–present: Hsien-Hsin Sean Lee * 2019–2023: Lizy Kurian John * 2015–2018: Lieven Eeckhout * 2011–2014: Erik R. Altman * 2007–2010: David H. Albonesi * 2003–2006: Pradip Bose * 1999–2001: Ken Sakamura * 1995–1998: Steve Diamond * 1991–1994: Dante Del Corso * 1987–1990: Joe Hootman * 1985–1987: James J. Farrell III * 1983–1984: Peter Rony and Tom Cain * 1980–1982: Richard C. Jaeger External links * Micro Micro may refer to: Measurement * ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
Janus (concurrent Constraint Programming Language)
Janus is a computer programming language partially described by K. Kahn and Vijay A. Saraswat in the paper "Actors as a special case of concurrent constraint (logic) programming" in 1990. It is a concurrent constraint language without backtracking. Janus models concurrency through the use of ''bag channels''. Code that needs to send a message to a process does so by constraining a bag to be the union of another bag and the singleton bag of the message. The other bag is then available to be constrained for sending subsequent messages. The process receives the message by matching the bag to a pattern that says it is the union of some singleton and some other bag. The logic of the bag channels produces a property shared by the actor model, namely that the order of arrival of the messages is not guaranteed. However, unlike actors in the actor model, processes in Janus can pass around their "mailboxes" so to speak, in the form of bags, and can hold more than one. This ability to pa ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
Akinori Yonezawa
(born June 17, 1947) is a Japanese computer scientist. Professor Emeritus of the University of Tokyo. Received Ph.D. from the Massachusetts Institute of Technology (MIT). Currently, a senior fellow at the Chiba Institute of Technology, Software Technology and Artificial Intelligence Research Center. Former member of the Science Council of Japan. Specializes in object-oriented programming languages, distributed computing and information security. From its beginning, he contributed to the promotion and development of object-oriented programming, which is the basis of programming languages most commonly used today (Python, Java, C++, etc.), and served as a program committee member and chairman of the main international conferences OOPSLA and ECOOP. At the same time, he is internationally known as a pioneer of the concepts and models of “concurrent/parallel objects". In software systems constructed based on concurrent/parallel objects, information processing and computation proce ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
Lecture Notes In Computer Science
''Lecture Notes in Computer Science'' is a series of computer science books published by Springer Science+Business Media since 1973. Overview The series contains proceedings, post-proceedings, monographs, and Festschrifts. In addition, tutorials, state-of-the-art surveys, and "hot topics" are increasingly being included. The series is indexed by DBLP. See also *'' Monographiae Biologicae'', another monograph series published by Springer Science+Business Media *'' Lecture Notes in Physics'' *'' Lecture Notes in Mathematics'' *'' Electronic Workshops in Computing'', published by the British Computer Society image:Maurice Vincent Wilkes 1980 (3).jpg, Sir Maurice Wilkes served as the first President of BCS in 1957. The British Computer Society (BCS), branded BCS, The Chartered Institute for IT, since 2009, is a professional body and a learned ... References External links * Academic journals established in 1973 Computer science books Series of non-fiction books ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
Carolyn Talcott
Carolyn Talcott (born June 14, 1941) is an American computer scientist known for work in formal reasoning, especially as it relates to computers, cryptanalysis and systems biology. She is currently the program director of the Symbolic Systems Biology group at SRI International. She is currently the co-editor-in-chief of '' Higher-Order and Symbolic Computation''. Talcott married John McCarthy (computer scientist) John McCarthy (September 4, 1927 – October 24, 2011) was an American computer scientist and cognitive scientist. He was one of the founders of the discipline of artificial intelligence. He co-authored the document that coined the term "artific ... and had a son. Early life and education Carolyn was born to Howard Talcott and Harriet Louise Mitchell who were Presbyterians from Idaho. Talcott earned a Ph.D. from Stanford University in 1985. Her dissertation, ''The Essence of RUM: A Theory of the Intensional and Extensional Aspects of LISP-Type Computation'', was supe ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
Actor Model Implementation
In computer science, actor model implementation concerns implementation issues for the actor model. Cosmic Cube The Caltech Cosmic Cube was developed by Chuck Seitz ''et al.'' at Caltech providing architectural support for actor systems. A significant difference between the Cosmic Cube and most other parallel processors is that this multiple instruction multiple-data machine uses message passing instead of shared variables for communication between concurrent processes. This computational model is reflected in the hardware structure and operating system, and is also the explicit message passing communication seen by the programmer. According to Seitz 985 :It was a premise of the Cosmic Cube experiment that the internode communication should scale well to very large numbers of nodes. A ''direct'' network like the hypercube satisfies this requirement, with respect to both the aggregate bandwidth achieved across the many concurrent communication channels and the feasibility of th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
Caltech
The California Institute of Technology (branded as Caltech) is a private university, private research university in Pasadena, California, United States. The university is responsible for many modern scientific advancements and is among a small group of Institute of Technology (United States), institutes of technology in the United States that are devoted to the instruction of pure and applied sciences. The institution was founded as a preparatory and vocational school by Amos G. Throop in 1891 and began attracting influential scientists such as George Ellery Hale, Arthur Amos Noyes, and Robert Andrews Millikan in the early 20th century. The vocational and preparatory schools were disbanded and spun off in 1910, and the college assumed its present name in 1920. In 1934, Caltech was elected to the Association of American Universities, and the antecedents of NASA's Jet Propulsion Laboratory, which Caltech continues to manage and operate, were established between 1936 and 1943 under ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
Unbounded Nondeterminism
In computer science, unbounded nondeterminism or unbounded indeterminacy refers to a behavior in concurrency (multiple tasks running at once) where a process may face unpredictable delays due to competition for shared resources—such as a printer or memory—or have infinitely many options to choose from at a given point. While these delays or choices can be arbitrarily large, the process is typically guaranteed to complete eventually under certain conditions (e.g., fairness in resource allocation). This concept, explored in abstract models rather than practical systems, became significant in developing mathematical descriptions of such systems (denotational semantics) and later contributed to research on advanced computing theories (hypercomputation). Fairness Unbounded nondeterminism is often discussed alongside the concept of ''fairness''. In this context, fairness means that if a system keeps returning to a certain state forever, it must eventually try every possible next s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
Distributed Systems
Distributed computing is a field of computer science that studies distributed systems, defined as computer systems whose inter-communicating components are located on different computer network, networked computers. The components of a distributed system communicate and coordinate their actions by message passing, passing messages to one another in order to achieve a common goal. Three significant challenges of distributed systems are: maintaining Concurrency (computer science), concurrency of components, overcoming the clock synchronization, lack of a global clock, and managing the independent failure of components. When a component of one system fails, the entire system does not fail. Examples of distributed systems vary from service-oriented architecture, SOA-based systems to microservices to massively multiplayer online games to peer-to-peer, peer-to-peer applications. Distributed systems cost significantly more than monolithic architectures, primarily due to increased needs ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
Petri Net
A Petri net, also known as a place/transition net (PT net), is one of several mathematical modeling languages for the description of distributed systems. It is a class of discrete event dynamic system. A Petri net is a directed bipartite graph that has two types of elements: places and transitions. Place elements are depicted as white circles and transition elements are depicted as rectangles. A place can contain any number of tokens, depicted as black circles. A transition is enabled if all places connected to it as inputs contain at least one token. Some sources state that Petri nets were invented in August 1939 by Carl Adam Petri — at the age of 13 — for the purpose of describing chemical processes. Like industry standards such as UML activity diagrams, Business Process Model and Notation, and event-driven process chains, Petri nets offer a graphical notation for stepwise processes that include choice, iteration, and concurrent execution. Unlike these standards, Pet ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
