The Role of the Business Model in Capturing Value from Innovation
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The Development of Smalltalk Topic Paper #7
The Development of Smalltalk Topic Paper #7 Alex Laird Max Earn Peer CS-3210-01 Reviewer On Time/Format 1 2/4/09 Survey of Programming Languages Correct 5 Spring 2009 Clear 2 Computer Science, (319) 360-8771 Concise 2 [email protected] Grading Rubric Grading Total 10 pts ABSTRACT Dynamically typed languages are easier on the compiler because This paper describes the development of the Smalltalk it has to make fewer passes and the brunt of checking is done on programming language. the syntax of the code. Compilation of Smalltalk is just-in-time compilation, also known Keywords as dynamic translation. It means that upon compilation, Smalltalk code is translated into byte code that is interpreted upon usage and Development, Smalltalk, Programming, Language at that point the interpreter converts the code to machine language and the code is executed. Dynamic translations work very well 1. INTRODUCTION with dynamic typing. Smalltalk, yet another programming language originally developed for educational purposes and now having a much 5. IMPLEMENTATIONS broader horizon, first appeared publically in the computing Smalltalk has been implemented in numerous ways and has been industry in 1980 as a dynamically-typed object-oriented language the influence of many future languages such as Java, Python, based largely on message-passing in Simula and Lisp. Object-C, and Ruby, just to name a few. Athena is a Smalltalk scripting engine for Java. Little Smalltalk 2. EARLY HISTORY was the first interpreter of the programming language to be used Development for Smalltalk started in 1969, but the language outside of the Xerox PARC. -
SDS 940 THEORY of OPERATION Technical Manual SDS 98 01 26A
SDS 940 THEORY OF OPERATION Technical Manual SDS 98 01 26A March 1967 SCIENTIFIC DATA SYSTEMS/1649 Seventeenth Street/Santa Monica, California/UP 1-0960 ® 1967 Scientific Data Systems, Inc. Printed in U. S. A. TABLE OF CONTENTS Section Page I GENERAL DESCRIPTION ...•.••.•••••.••.••.•..•.••••• 1-1 1.1 General ................................... 1-1 1.2 Documentation .•...•..•.••..•••••••.•.••.••••• 1-1 1 .3 Physical Description ..•...•.••••.••..••••..••••. 1-2 1.4 Featu re s • . • . • • • • . • • • • • . • • . • . • . • • . • • • 1-2 1 .5 Input/Output Capabi I ity •.•....•.•.......•.....•.. 1-2 1 .5. 1 Parallel Input/Output System .•...•.....••..•. 1-6 1.5.1.1 Word Parallel System ...........•.. 1-6 1.5.1.2 Single-Bit Control and Sense System .... 1-8 1 .5.2 Time-Multiplexed Communication Channels .....•. 1-8 1 .5.3 Direct Memory Access System ............... 1-9 1.5.3.1 Direct Access Communication Channels •. 1-9 1.5.3.2 Data Multiplexing System ...•.....•. 1-10 1 .5.4 Priority Interrupt System . • . 1-10 1.5.4.1 Externa I Interrupt •..........•.... 1-11 1.5.4.2 Input/Output Channe I ..•..•.•••••. 1-12 1.5.4.3 Real-Time Clock •••.••.••••••••• 1-12 1 .6 Input/Output Devices •..•..••.••.••.••.•••••..•. 1-12 1 .6. 1 Buffered Input/Output Devices ..••.••.•.•••.•• 1-12 1.6.2 Unbuffered Input/Output Devices ••••..••••..•• 1-14 II OPERATION AND PROGRAMMING •..•••••.••.•..•....••. 2-1 2. 1 General .•..•.......•......•..............•. 2-1 2.2 Chang i ng Operat ion Modes •.•.••.••.•••.•..•..•.•• 2-2 2.3 Modes of Operation •..••.••.••.••..••••..••••••• 2-2 2.3. 1 Normal Mode .••••••••••••••••••••.••••• 2-2 2.3.1.1 Interrupt Rout i ne Return Instru ction .•.•. 2-3 2.3.1.2 Overflow Instructions ...••..•••••• 2-3 2.3.1.3 Mode Change Instruction ....••.•..• 2-3 2.3.1.4 Data Mu Itiplex Channe I Interlace Word •. -
The Cedar Programming Environment: a Midterm Report and Examination
The Cedar Programming Environment: A Midterm Report and Examination Warren Teitelman The Cedar Programming Environment: A Midterm Report and Examination Warren Teitelman t CSL-83-11 June 1984 [P83-00012] © Copyright 1984 Xerox Corporation. All rights reserved. CR Categories and Subject Descriptors: D.2_6 [Software Engineering]: Programming environments. Additional Keywords and Phrases: integrated programming environment, experimental programming, display oriented user interface, strongly typed programming language environment, personal computing. t The author's present address is: Sun Microsystems, Inc., 2550 Garcia Avenue, Mountain View, Ca. 94043. The work described here was performed while employed by Xerox Corporation. XEROX Xerox Corporation Palo Alto Research Center 3333 Coyote Hill Road Palo Alto, California 94304 1 Abstract: This collection of papers comprises a report on Cedar, a state-of-the-art programming system. Cedar combines in a single integrated environment: high-quality graphics, a sophisticated editor and document preparation facility, and a variety of tools for the programmer to use in the construction and debugging of his programs. The Cedar Programming Language is a strongly-typed, compiler-oriented language of the Pascal family. What is especially interesting about the Ce~ar project is that it is one of the few examples where an interactive, experimental programming environment has been built for this kind of language. In the past, such environments have been confined to dynamically typed languages like Lisp and Smalltalk. The first paper, "The Roots of Cedar," describes the conditions in 1978 in the Xerox Palo Alto Research Center's Computer Science Laboratory that led us to embark on the Cedar project and helped to define its objectives and goals. -
MVC Revival on the Web
MVC Revival on the Web Janko Mivšek [email protected] @mivsek @aidaweb ESUG 2013 Motivation 30 years of Smalltalk, 30 years of MVC 34 years exa!tly, sin!e "#$# %ot in JavaScri&t MVC frameworks 'or Sin(le)*age and +ealtime web a&&s ,e Smalltalkers s-ould respe!t and revive our &earls better Contents MVC e &lained %istory /sa(e in !.rrent JavaScri&t frameworks /sa(e in Smalltalk C.rrent and f.t.re MVC in 0ida/Web MVC Explained events Ar!hite!tural desi(n &attern - Model for domain s&e!ifi! data and logi! View updates Controller ) View for &resentation to t-e .ser ) Controller for intera!tions wit- t-e .ser UI and .&datin( domain model Domain changes Main benefit: actions observing ) se&aration of !on!erns Model MVC based on Observer pattern subscribe ) 3bserver looks at observee Observer changed - 3bservee is not aware of t-at s u 4e&enden!y me!-anism2 B t n - 3bserver is de&endent on 3bservee state e observing v - 3bservee m.st re&ort state !-an(es to 3bserver E b - *.b/S.b Event 6.s de!ou&les 3bservee from u S / 3bserver to &reserve its .nawarnes of observation b u changed P Observee Main benefit: (Observable) ) se&aration of !on!erns Multiple observers subscribe - M.lti&le observers of t-e same 3bservee Observer changed - 7n MVC an 3bservee is View and 3bservee is domain Model, t-erefore2 s u B t - many views of t-e same model n e observing v - many a&&s E b - many .sers u S / - mix of all t-ree !ases b u Observee changed P (Observable) Example: Counter demo in Aida/Web M.lti.ser realtime web !ounter exam&le -ttp://demo.aidaweb.si – !li!k Realtime on t-e left – !li!k De!rease or In!rease to c-an(e counter – !ounter is c-an(ed on all ot-er8s browsers History of MVC (1) 7nvented by 9rygve +eenska.g w-en -e worked in "#$:1$# wit- Alan ;ay's group on <ero *arc on Smalltalk and Dynabook – 'inal term Model)View)Controller !oined 10. -
Dynamic Object-Oriented Programming with Smalltalk
Dynamic Object-Oriented Programming with Smalltalk 1. Introduction Prof. O. Nierstrasz Autumn Semester 2009 LECTURE TITLE What is surprising about Smalltalk > Everything is an object > Everything happens by sending messages > All the source code is there all the time > You can't lose code > You can change everything > You can change things without restarting the system > The Debugger is your Friend © Oscar Nierstrasz 2 ST — Introduction Why Smalltalk? > Pure object-oriented language and environment — “Everything is an object” > Origin of many innovations in OO development — RDD, IDE, MVC, XUnit … > Improves on many of its successors — Fully interactive and dynamic © Oscar Nierstrasz 1.3 ST — Introduction What is Smalltalk? > Pure OO language — Single inheritance — Dynamically typed > Language and environment — Guiding principle: “Everything is an Object” — Class browser, debugger, inspector, … — Mature class library and tools > Virtual machine — Objects exist in a persistent image [+ changes] — Incremental compilation © Oscar Nierstrasz 1.4 ST — Introduction Smalltalk vs. C++ vs. Java Smalltalk C++ Java Object model Pure Hybrid Hybrid Garbage collection Automatic Manual Automatic Inheritance Single Multiple Single Types Dynamic Static Static Reflection Fully reflective Introspection Introspection Semaphores, Some libraries Monitors Concurrency Monitors Categories, Namespaces Packages Modules namespaces © Oscar Nierstrasz 1.5 ST — Introduction Smalltalk: a State of Mind > Small and uniform language — Syntax fits on one sheet of paper > -
As We May Communicate Carson Reynolds Department of Technical Communication University of Washington
As We May Communicate Carson Reynolds Department of Technical Communication University of Washington Abstract The purpose of this article is to critique and reshape one of the fundamental paradigms of Human-Computer Interaction: the workspace. This treatise argues that the concept of a workspace—as an interaction metaphor—has certain intrinsic defects. As an alternative, a new interaction model, the communication space is offered in the hope that it will bring user interfaces closer to the ideal of human-computer symbiosis. Keywords: Workspace, Communication Space, Human-Computer Interaction Our computer systems and corresponding interfaces have come quite a long way in recent years. We no longer patiently punch cards or type obscure and unintelligible commands to interact with our computers. However, out current graphical user interfaces, for all of their advantages, still have shortcomings. It is the purpose of this paper to attempt to deduce these flaws by carefully examining our earliest and most basic formulation of what a computer should be: a workspace. The History of the Workspace The modern computerized workspace has its beginning in Vannevar Bush’s landmark article, “As We May Think.” Bush presented the MEMEX: his vision of an ideal workspace for researchers and scholars that was capable of retrieving and managing information. Bush thought that machines capable of manipulating information could transform the way that humans think. What did Bush’s idealized workspace involve? It consists of a desk, and while it can presumably be operated from a distance, it is primarily the piece of furniture at which he works. On top are slanting translucent screens, on which material can be projected for convenient reading. -
SDS 900 Series, 1962
The SDS 920 is a low cost, general purpose computer designed for sci- entific engineering computation and for systems integration. It has all the speed and operating features found only in much more expensive equipment, including instructions that facilitate floating-point and multi- precision operations. An evaluation of the 920's unequalled perform- ance-per-dollar capabilities can be made by comparing the following characteristics with any presently available digital computer: EXECUTION TIMES: All times include both memory access & indexing Add ........................................ 16 microseconds Mutiply ..................................... 32 microseconds Floating-Point Operations: (24-bit Mantissa plus 9-bit Exponent) Add ....................................292 mic~oseconds Multiply ............................... .248 microseconds (39-bit Mantissa plus 9-bit Exponent) Add ....................................368 microseconds Multiply ............................... .600 micmsecands PROGRAMMING: -- OENERAL PURPOSE COMPUTERS Control Pawl SI3S 4r09 &rim iDS 920 is a low cost, general purpose computer designed for sci- .......: engineering computation and for systems integration. It has all I the speed and operating features found only in much more expensive equipment, including instructions that facilitate floating-point and multi- precision operations. An evaluation of the 920's unequalled perform- per-dollar capabilities can be made by comparing the following 8 cteristics with any presently available digital computer: ' TYPE: Single address with indc g and indirect addressing Binary I Core Memory Solid State ructions for facilitating floating-point ,, iulti-precision opera1 , Parity checking on Input/Output and I sry Operations Prc ~---.dOperator magnetic core 4096 words expandable to 16,- ly addressable 24-bit word and parity Non- r include bot,' mory access & indexing ................ 16 microseconds ...................... 32 microseconds ...................292 micro .................. .248 microseconds bit Exponent ............................... -
Session 1: Introducing Extreme Java
Extreme Java G22.3033-006 Session 1 – Main Theme Introducing Extreme Java Dr. Jean-Claude Franchitti New York University Computer Science Department Courant Institute of Mathematical Sciences Agenda • Course Logistics, Structure and Objectives • Java Programming Language Features • Java Environment Limitations • Upcoming Features in “Tiger” 1.5 • Model Driven Architectures for Java Systems • Java Enterprise Application Enabling • Agile Modeling & eXtreme Programming • Aspect-Oriented Programming & Refactoring • Java Application Performance Enhancement • Readings, Class Project, and Assignment #1a 2 1 Course Logistics • Course Web Site • http://cs.nyu.edu/courses/spring03/G22.3033-006/index.htm • http://www.nyu.edu/classes/jcf/g22.3033-007/ • (Password: extjava) • Course Structure, Objectives, and References • See detailed syllabus on the course Web site under handouts • See ordered list of references on the course Web site • Textbooks • Mastering Java 2, J2SE 1.4 • J2EE: The Complete Reference • Expert One-on-One: J2EE Design and Development 3 Part I Java Features 4 2 Java Features Review • Language Categories • Imperative • Functional • Logic-based • Model-based PL Comparison Framework • Data Model • Behavioral Model • Event Model • Execution, Persistence, etc. • See Session 1 Handout on Java Review 5 J2SE 1.4 Features http://java.sun.com/j2se/1.4/index.html 6 3 J2SE 1.4 Features (continued) • HotSpot virtual machine • Full 64-bit support • Improved garbage collection • Ability to exploit multiprocessing • Optimization of the Java2D -
Creating Graphical User Interfaces
i i \main" 2004/6/14 page 355 i i C H A P T E R 15 Creating Graphical User Interfaces 15.1 WHERE DO GRAPHICAL USER INTERFACES COME FROM? 15.2 CREATING A BASIC GRAPHICAL USER INTERFACE 15.3 CALLBACKS AND LAYOUT MANAGERS 15.4 USING SCROLLING LISTS Chapter Learning Objectives ² To make graphical user interfaces out of components such as windows, text ¯elds, buttons, and scrolling lists. ² To use callbacks to handle user interface events. ² To use trees for conceptualizing user interface structure. 15.1 WHERE DO GRAPHICAL USER INTERFACES COME FROM? The ¯rst computers were incredibly painful and tedious to work with. You \pro- grammed" them by literally rewiring them. There wasn't a screen, so you couldn't have a \graphical" user interface at all. Our common experience of using a keyboard to interact with the computer didn't come until much later. In the late 1960's, the dominant mode of interaction with the computer was through punched cards. Using a keyboard on a card punch machine, you prepared your instructions for the computer on pieces of cardboard that were then ordered in the right sequence and loaded into the computer. Heaven help the person who dropped her stack of cards and had to re-order hundreds of cards of a large program! The output from the computer back to the programmer was typically large piles of paper printouts, though was some starting work with computer music and computer graphics (on specialized, expensive monitors). In the 1960's and 1970's, computer scientists began envisioning a new role for the computer in its interaction with humans. -
Comparative Studies of 10 Programming Languages Within 10 Diverse Criteria Revision 1.0
Comparative Studies of 10 Programming Languages within 10 Diverse Criteria Revision 1.0 Rana Naim∗ Mohammad Fahim Nizam† Concordia University Montreal, Concordia University Montreal, Quebec, Canada Quebec, Canada [email protected] [email protected] Sheetal Hanamasagar‡ Jalal Noureddine§ Concordia University Montreal, Concordia University Montreal, Quebec, Canada Quebec, Canada [email protected] [email protected] Marinela Miladinova¶ Concordia University Montreal, Quebec, Canada [email protected] Abstract This is a survey on the programming languages: C++, JavaScript, AspectJ, C#, Haskell, Java, PHP, Scala, Scheme, and BPEL. Our survey work involves a comparative study of these ten programming languages with respect to the following criteria: secure programming practices, web application development, web service composition, OOP-based abstractions, reflection, aspect orientation, functional programming, declarative programming, batch scripting, and UI prototyping. We study these languages in the context of the above mentioned criteria and the level of support they provide for each one of them. Keywords: programming languages, programming paradigms, language features, language design and implementation 1 Introduction Choosing the best language that would satisfy all requirements for the given problem domain can be a difficult task. Some languages are better suited for specific applications than others. In order to select the proper one for the specific problem domain, one has to know what features it provides to support the requirements. Different languages support different paradigms, provide different abstractions, and have different levels of expressive power. Some are better suited to express algorithms and others are targeting the non-technical users. The question is then what is the best tool for a particular problem. -
CSCI-344 Programming Language Concepts (Section 3)
CSCI-344 Programming Language Concepts (Section 3) Lecture 18 Introduction to Smalltalk Instructor: Hossein Hojjat October 19, 2016 Smalltalk: Grandparent of all object-oriented languages 1 Traveling upward (in the picture) through heavy seas we come to the pinnacle, a snow white island rising like an ivory tower out of the surrounding shark infested waters. Here we find the fantastic kingdom of Smalltalk, where great and magical things happen. But alas ... the craggy aloofness of the kingdom of Smalltalk keeps it out of the mainstream of things. (Byte Magazine August 1978, p. 18) 2 Xerox PARC • It all started here, in Rochester! • In early seventies Xerox corporation (Rochester) started a second research center in west coast Xerox PARC (Palo Alto Research Center Incorporated) • PARC was the driving force behind many inventions in modern computing - Laser printers - Computer-generated bitmap graphics - Graphical user interface - WYSIWYG text editor - Ethernet as a local-area computer network - Object-oriented programming (Smalltalk) 3 Xerox PARC 4 Alan Kay • In 1968 Kay created a revolutionary concept: “A Personal Computer For Children Of All Ages” • Thin portable computer, highly dynamic device that weighed no more than two pounds • It embodied all the elements of a graphical user interface, or GUI • Software component of this research was Smalltalk - Smalltalk went on to have a life of its own independent of the concept 5 Implementations • Smalltalk-80 was the first language variant made available outside of PARC • Squeak is a modern, open-source, highly portable, fast, full-featured Smalltalk implementation - Derived directly from Smalltalk-80 original Smalltalk-80 code 6 Basic Concepts • Smalltalk is a pure object oriented language • Everything in Smalltalk is an object! - Basic primitive types (integers) are objects - Every value is an object: number 5 is an object - .. -
Croquet: a Collaboration System Architecture
Croquet: A Collaboration System Architecture David A. Smith, Alan Kay, Andreas Raab, David P. Reed VPRI Technical Report TR-2003-002 Viewpoints Research Institute, 1025 Westwood Blvd 2nd flr, Los Angeles, CA 90024 t: (310) 208-0524 VPRI Technical Report TR-2003-002 Croquet A Collaboration System Architecture David A. Smith Alan Kay 1 Andreas Raab David P. Reed 104 So. Tamilynn Cr. 1209 Grand Central Ave University of MIT Media Laboratory Cary NC, 27513 Glendale, CA 91201 Magdeburg, Germany 20 Ames Street davidasmith@ alan.kay@ andreas.raab@ Room E15-492 bellsouth.net viewpointsresearch.orG squeakland.orG CambridGe, MA 02139 [email protected] ABSTRACT1 this question was asked lonG aGo, and the strenGth of the Croquet [18] is a computer software architecture built from answer has successfully carried us for a quarter century. On the Ground up with a focus on deep collaboration between the other hand, the current environments are really just the teams of users. It is a totally open, totally free, highly thin veneer over what even lonG aGo were seriously portable extension to the Squeak [5] proGramminG system. outmoded approaches to development and desiGn. Many of Croquet is a complete development and delivery platform the really Good fundamental ideas that people had were left for doinG real collaborative work. There is no distinction on the cuttinG room floor. between the user environment and the development environment. great deal has happened in the last few decades that allows Croquet is focused on interactions inside of a 3D shared for some fundamentally new approaches that could not have space that is used for context based collaboration, where been considered at the time.