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Topic: Top down and bottom up design

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Top-down and bottom-up design - Wikipedia, the free encyclopedia Modern software design approaches usually combine both top-down and bottom-up approaches. The top-down model is often designed with the assistance of "dark boxes" that make it easier to bring to fulfillment but insufficient and irrelevant in understanding the elementary mechanisms. Top-down design was promoted in the 1970s by IBM researcher Harlan Mills and Niklaus Wirth. en.wikipedia.org /wiki/Top-down   (903 words)

VisualWorks: top-down and bottom-up design The advantage of bottom up design is the economies that result when general solutions can be reused. A disadvantage of bottom-up design is that its focus is not on specific requirements. In bottom-up design, the emphasis is on applying general solutions to a wide range of problems. wiki.cs.uiuc.edu /VisualWorks/top-down+and+bottom-up+design   (925 words)

"Top down" and "Bottom up" design Top down design is usually possible only when you start by having a very clear idea of the problem and how to solve it. A design methodology that starts by defining the "low level" procedures then moves up towards more and more complex procedures using those already defined is called "bottom up design". Whether you do your programming top down or bottom up, it is absolutely essential to be clear about the "ontology" of your problem. www.cs.bham.ac.uk /research/poplog/primer/node25.html   (248 words)

things magazine - vapourware in paper See also the article, 'When Design is a matter of Life or Death,' the story of William LeMessurier, structural engineer for Hugh Stubbins' Citicorp Center, revisiting a classic 1995 New Yorker story, The Fifty-Nine Storey Crisis. Apparently some of the boats had been at sea continuously for up to eight years (thanks to rotational). Retro design has very little sense of the antagonistic 'us versus them' mentality that characterises 'hard-edge' modernism. thingsmagazine.net   (1570 words)

TechOnLine - Mixed-Signal ASIC Top-Down and Bottom-Up Design Methodologies using VHDL-AMS The paper describes the process of top-down and bottom-up of a mixed-signal ASIC design using VHDL-AMS. Mixed-Signal ASIC Top-Down and Bottom-Up Design Methodologies using VHDL-AMS They describe how they validated the new design methodologies with a demonstrator: a Single Conversion Receiver (superheterodyne). www.techonline.com /community/tech_group/analog/tech_paper/29532   (189 words)

South Pacific travel - Pacific islands books Sia Figiel recounts the experience of growing up in a Samoan village and the struggle for an identity. Photographer Kurt Amsler's three-dimensionial color maps of French Polynesia's top dive sites are excellent. This Aqua Quest Diving guide covers Guam, the Marianas, Yap, Palau, Chuuk, Pohnpei, Kosrae, and the Marshall Islands. www.southpacific.org /books.html   (806 words)

CPS 450 top-down and bottom-up parsing Unlike top-down and bottom-up design (where top-down is considered generally superior) top-down and bottom-up parsing each has its advantages and disadvantages. Top-down parsing is goal directed: "Here is a good parse, let's see if we have the data." Bottom-up parsing is data directed: "This is what we have, let's see if it's a good parse." In bottom-up parsing, we build the parse tree a piece at a time, looking at the tokens and trying to find the simplest, lowest-level units they can be part of. www.cps.cmich.edu /~ahlswede/class/cps450/topdown.html   (806 words)

top-down design - OneLook Dictionary Search Top-down and Bottom-up are approaches to the software development process, and by extension to other procedures, mostly involving software.In the Top-Down Model an overview of the system is formulated, without going into detail for any part of it. Tip: Click on the first link on a line below to go directly to a page where "top-down design" is defined. We found 5 dictionaries with English definitions that include the word top-down design : www.onelook.com /cgi-bin/cgiwrap/bware/dofind.cgi?word=top-down+design   (806 words)

PhD. Dissertation of Miguel A. Alonso Pardo Strongly-driven 2-stack automata can be used to describe bottom-up, top-down or mixed parsing strategies for tree adjoining languages with respect to the recognition of the adjunctions. In the first part of this dissertation, we introduce the problem of parsing tree adjoining grammars and linear indexed grammars, creating, for both formalisms, a continuum from simple pure bottom-up algorithms to complex predictive algorithms and showing what transformations must be applied to each one in order to obtain the next one in the continuum. We describe several tabular algorithms for Tree Adjoining Grammar parsing, creating a continuum from simple pure bottom-up algorithms to complex predictive algorithms and showing what transformations must be applied to each one in order to obtain the next one in the continuum. www.dc.fi.udc.es /~alonso/phd.html   (806 words)

A Top-Down Microsystems Design Methodology and Associated Challenges A typical bottom-up design methodology is described and we propose, in contrast, an efficient and effective top-down methodology. Design, Automation and Test in Europe Conference and Exhibition (DATE'03 Designers' Forum) We illustrate its implementation with the development of a microsystem design that has been completed and fabricated in CMOS technology. csdl.computer.org /comp/proceedings/date/2003/1870/02/187020292abs.htm   (806 words)

Cognitive Science as Reverse Engineering: Several Meanings of "Top-Down" and "Bottom-Up" In these contexts, the trade-off between top-down and bottom-up is a design parameter of a model that might, in principle, be tuned to fit the circumstances. The general stepped up to the mike and cleared his throat--which the computer immediately interpreted as "Pawn to King-4." Again, too much top-down, not enough bottom-up. Artificial Life, then, promises to improve the epistemic position of researchers by opening up different regions of design space--and these regions include the regions in which successful AI is itself apt to be found! cogsci.soton.ac.uk /~harnad/Papers/Py104/dennett.eng.html   (3297 words)

Programming Bottom-Up As well as top-down design, they follow a principle which could be called bottom-up design-- changing the language to suit the problem. In typical code, once you abstract out the parts which are merely bookkeeping, what's left is much shorter; the higher you build up the language, the less distance you will have to travel from the top down to it. And when language and program fit one another well, you end up with code which is clear, small, and efficient. www.paulgraham.com /progbot.html   (895 words)

W3C HTML Home Page It is designed to be appropriate for printing from mobile devices to low-cost printers that might not have a full-page buffer and that generally print from top-to-bottom and left-to-right with the paper in a portrait orientation. XHTML-Print is designed to be appropriate for printing from mobile devices to low-cost printers that might not have a full-page buffer and that generally print from top-to-bottom and left-to-right with the paper in a portrait orientation. While XHTML 1.1 looks very similar to XHTML 1.0 Strict, it is designed to serve as the basis for future extended XHTML Family document types, and its modular design makes it easier to add other modules as needed or integrate itself into other markup languages. www.w3.org /MarkUp   (895 words)

MBDC: Monthly Feature Story Typically, meeting the triple bottom line is seen as a balancing act, a series of compromises between competing interests played out in product and process design. When products and services such as these are the norm, when design for the triple top line is applied at every level of industry, productivity and profits will no longer be at odds with the concerns of the commons. Triple top line thinkers, rather than trying to balance these values, discover opportunities in honoring the needs of all three. www.mbdc.com /features/feature_aug2002.htm   (885 words)

W3C HTML Home Page It is designed to be appropriate for printing from mobile devices to low-cost printers that might not have a full-page buffer and that generally print from top-to-bottom and left-to-right with the paper in a portrait orientation. XHTML-Print is designed to be appropriate for printing from mobile devices to low-cost printers that might not have a full-page buffer and that generally print from top-to-bottom and left-to-right with the paper in a portrait orientation. W3C is working on the design of the next generation of web forms with a view to separating the presentation, data and logic, as a means to allowing the same forms to be used with widely differing presentations. www.w3.org /MarkUp   (4438 words)

Design Top-down and bottom-up design Top-down and Bottom-up are approaches to the software development process, and by extensio... Design pattern (architecture) The idea of capturing pattern language, whereas the elements of this language may be combi... Design by contract Design by contract or DBC is a methodology for designing contract. www.brainyencyclopedia.com /topics/design.html   (1753 words)

Compiler design (Henry Spencer) This is actually somewhat amusing, because the first C compiler in fact used a top-down parser, and one of the early implementors of a bottom-up C parser (Steve Johnson) complained in print that the language was designed for top-down and was awkward to parse bottom-up! For example, top-down with the usual one token of lookahead has difficulty with some aspects of C expression syntax, where "(" may introduce a parenthesized subexpression [a + (b * c)] or a unary conversion [a + (unsigned) b], and a top-down parser has to decide which way to go before seeing what follows. I've also implemented several systems in which the scanner is followed by an error-repair layer which interfaces the scanner to the (top-down) parser, hiding syntax errors from the parser. www.yarchive.net /comp/compiler.html   (1753 words)

Caller.com: Home & Garden Television Then we fastened four heavy-duty top plates to the bottom and then screwed on decorative feet to accentuate the unit. We added a center brace to the top shelf to help support the weight of a television set (figure G). We'll show you how to design, construct and assemble a handsome entertainment center. www.caller.com /ccct/home_garden_on_tv/article/0,1641,CCCT_988_1269160,00.html   (1206 words)

MSW Management Landfill Design: The Matrix Approach The landfill design sequence has two potential work paths once the facility layout has been determined: one associated with the “top” of the landfill (phasing, final grades, cap and cover, surface water, erosion, and landfill gas), the other with the “bottom” of the landfill (foundation, liner, leachate collection, leachate extraction, and leachate disposal). Additional hydrogeological information will then be used to design the first task of the “bottom of the landfill” work path, layout of a groundwater management system (if necessary). The matrix approach is facilitated by the fact that the design of each landfill system and the overall design effort follow a consistent sequence. www.forester.net /mw_0503_design.html   (1206 words)

Top-down and bottom-up design - Wikipedia, the free encyclopedia The alternative way, bottom up is to start with atoms and molecules and manufacture it from the bottom up instead of starting with large parts. Top down method for manufacturing is the way silicon electronics are manufactured i.e. This is an example of the use of top-down information. en.wikipedia.org /wiki/Top-down   (710 words)

Overclockers Forums - Object Oriented Programming Bottom up programming is the opposite; You move from the most specific (bottom) and work your way to the most general (top.) This is sometimes used for implementation. Object oriented programming is a code organization strategy and top down programming is a design strategy. Top down refers to a method of designing a program; First, you thing about the most general level of the program. www.ocforums.com /showthread.php?t=379325   (1839 words)

California State University, Long Beach We cover top down and bottom up parsing, and introduce the automated tools for scanning and bottom up methods; lex (flex) and yacc (bison) from the text. We then show how intermediate code (3-address-code and/or P-code) is generated during bottom up parsing and finish with a discussion of optimization as time permits. Organization of a compiler and overall design: parsing, semantic analysis, optimization and code generation. www.csulb.edu /colleges/coe/cecs/views/courses/upper/outlines/test_outline.shtml   (235 words)

Modular Design Top-down Design - Design the general tasks at the beginning (top) and then refine (with stepwise refinement) into more specific tasks (at the bottom). strucured programming: modular design with: sequence, decision and loop constructs Stepwise refinement - repeatedly apply a "divide-and-conqure" approach to a large problem to break it up in to smaller, more understandable sub-problems www2.sunysuffolk.edu /healyr/cm12/notes/moddesign.htm   (235 words)

Top-down and bottom-up design : Top-Down Model Modern design methodologies never mention these early forebearers, though they more closely resemble Bottom-up design in that code is reused, libraries purchased or downloaded, and in general, code is reused. By contrast, the bottom-up design is a way to construct software from small pieces of code to the whole system. Reusable parts, modules, frameworks and so forth and developed independently, and debugged, and then the end product is built on top of them. www.eurofreehost.com /to/Top-Down_Model.html   (235 words)

Cartography - Encyclopedia.WorldSearch The land on the map was divided into three parts by a T shape in which Asia occupied the top of the T area, Europe the bottom left and Africa the bottom right. Maps have traditionally been made using pen and paper, but the advent and spread of computer s has revolutionized cartography. Spatial data is acquired from measurement and can be stored in a database, from which it can be extracted for a variety of purposes. encyclopedia.worldsearch.com /cartography.htm   (235 words)

Boston.com / Sports / Bottom line up front On the other hand, there are a lot of things that need to be fixed in all three phases of the game, and defensively, that is at the top of the list." We don't have any defensive design to have a guy outside of the defense run for 19 yards to the sideline. But they did just that against the Colts, much to the delight of Corey Dillon, who gained 86 yards on 15 carries in his Patriots debut and had many wondering why he didn't carry the ball more. www.boston.com /sports/articles/2004/09/11/bottom_line_up_front   (235 words)

CITDA - Quilt Design Software for the Mass Market CAD Design The top layer showcases the design, the middle layer is the stuffing (or batting), and the bottom layer is usually one solid piece with little or no design. Blocks are fabric shapes that have been sewn together to create a motif, usually geometric designs with mostly straight lines, and occasional curved lines. Designers have the ability to export the quilt design and print on a large format paper or fabric printer. www.citda.org /news/archives/Quilt.html   (1284 words)

www.odd.co.uk From humble beginnings, we have developed to become one of the region's top creative studios with a dedicated creative team and loyal clients across the country. For a full list of our design products follow the links at the bottom of the page. Open Door Design is delighted to announce its 10-year anniversary. www.odd.co.uk   (173 words)

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