Showing papers on "Data flow diagram published in 1975"

The IBM 3850 mass storage system: Design aspects

Abstract: The IBM 3850 mass storage system is a new concept in large data base storage. This paper explores the principal design objectives and the options chosen in designing the hardware and the data flow for the system. The 3850 is an approach that provides up to 472 × 109bytes of storage, gives reasonable on-line storage cost comparable to manually loaded flexible media products such as half-inch tape drives, provides internally controlled data staging at the request of the host processor, and provides a parallel-path data flow. The parallel-path data flow in turn provides multiple staging and destaging-plus increased availability of data--by using full multiple data paths for all data.

A new interpreter for data flow schemas and its implications for computer architecture

Abstract: Author(s): Arvind; Gostelow, Kim P. | Abstract: The execution of a program may be viewed as the processing of a statement in a programming language by an underlying interpreter. This report discusses briefly the advantages of a data flow language over conventional programming methods, and then presents a new interpreter for a data flow language. Using as a base the data flow language of Dennis ["First Version of a Data Flow Procedure Language" Computation Structures Group Memo 93, Project MAC, MIT, Nov. 1973], the new interpreter magnifies the apparent asynchrony and speed of data flow, and it does so by (quite literally) exchanging blocks of processors for slices of time. The report gives details of the operation of this new interpreter, and identifies the consequences of the new interpreter on machine architecture and design.

The Applications of McIdas

Abstract: The Man-computer Interactive Data Access System (McIDAS) is a combination of hardware and software developed for processing image data from high volume data sources such as satellites. This paper describes the use of McIDAS. Key features of McIDAS are: color television display with capability for rapid (up to 30 frames/sec) sequencing of set of images, analog and digital data storage, interactive data processing and display control, data flow and processing controlled by computer software, data processing by accessing subsets of data. Uses of McIDAS include: measuring cloud velocities from geosynchronous satellites, calibrating cloud pictures for rain from radar, classifying land use from ERTS images, assembling weather data for public broadcast.

Automatic generation of physical data base structures

Abstract: This paper addresses a problem which arises during the design of an integrated data base: this is to generate a set of physical data structures capable of supporting a desired set of logical data structures. A prototype design aid which generates physical data structures for IMS is described. A state diagram is used to represent the constraints imposed by IMS, and a modified depth first tree search is used to find the physical data structures. One can force the solution to either satisfy bounds on one or more objective functions, and/or optimize a single objective function.

Logic State Analyzers-A New Instrument for Analyzing Sequential Digital Processes

Abstract: Logic state analyzers are used to monitor, or measure, the sequence of program and data flow in sequential processors, such as computers and microprocessors, as a means of debugging, testing, and troubleshooting these processors. The application of these measurements is discussed using examples of debugging and troubleshooting techniques made possible by logic state analyzers. The capabilities required to implement these measurements are set forth using the previously described measurements. These measurement capabilities, then, become the functional definition of a logic state analyzer. Finally, the block diagram required to implement these measurement capabilities is developed as a further means of describing the measurement of logic or data sequences and the application of these measurements to troubleshooting, debugging, and testing sequential digital machines and systems.

Systems Analysis on Invertebrates

Abstract: This paper presents the basic ideas used in constructing a model based on the Odum energy circuit language (Odum, H.T., 1971). A flow diagram of the energy flow through the main invertebrate consumer groups is given in Fig. 1. This language is especially convenient for energy-flow specifications, and has the advantage that it clearly defines the function of the system. This is not the case with the frequently used compartment flow diagrams.