Cumincad : CUMINCAD Papers : Search Results

CumInCAD is a Cumulative Index about publications in Computer Aided Architectural Design
supported by the sibling associations ACADIA, CAADRIA, eCAADe, SIGraDi, ASCAAD and CAAD futures

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Hits 1 to 20 of 1473

Reformat results as: short short into frame detailed detailed into frame

_id	9964
authors	Augenbroe, G. and Winkelmann, F.
year	1991
title	Integration of Simulation into the Building Design Process
source	J.A. Clarke, J.W. Mitchell, and R.C. Van de Perre (eds.), Proceedings, Building Simulation '91 IBPSA Conference, pp. 367-374
summary	We describe the need for a joint effort between design researchers and simulation tool developers in formulating procedures and standards for integrating simulation into the building design process. We review and discuss current efforts in the US and Europe in the development of next-generation simulation tools and design integration techniques. In particular, we describe initiatives in object-oriented simulation environments (including the US Energy 'Kernel System, the Swedish Ida system, the UK Energy Kernel System, and the French ZOOM program.) and consider the relationship of these environments to recent R&D initiatives in design integration (the COMBINE project in Europe and the AEDOT project in the US).
series	other
last changed	2003/11/21 15:16

_id	a1dc
authors	Budd, T.
year	1991
title	An introduction to Object Oriented programming
source	Addison-Wesley
summary	In An Introduction to Object-Oriented Programming, Timothy Budd provides a language-independent presentation of object-oriented principles, such as objects, methods, inheritance (including multiple inheritance) and polymorphism. Examples are drawn from several different languages, including (among others) C++, C#, Java, CLOS, Delphi, Eiffel, Objective-C and Smalltalk. By examining many languages, the reader is better able to appreciate the general principles that lie beyond the syntax of the individual languages.
series	other
last changed	2003/04/23 15:14

_id	c81f
authors	Chandansing, R.A. and Vos, C.J.
year	1991
title	IT - Use in Reinforced Concrete Detailing : The Current State, a Forecasting-Model, and a Future-Concept
source	The Computer Integrated Future, CIB W78 Seminar. september, 1991. Unnumbered : ill., tables. includes bibliography
summary	This paper describes the current state in the Netherlands, concerning the levels of CAD-systems used, their diffusion in practice and constraints and effects of their use for reinforced concrete detailing. An initial forecasting model for the further development of IT in the concrete construction industry and a future-concept for IT-use in reinforced concrete detailing are presented as well
keywords	CAD, structures, engineering, building, practice, systems, detailing, construction
series	CADline
last changed	2003/06/02 13:58

_id	9c37
id	9c37
authors	Coates P, Derix C, Krakhofer S and Karanouh A
year	2005
title	Generating Architectural Spatial Configurations: two approaches using voronoi tessellations and particle systems
source	Proceedings of the Generative Arts conference, Milan, 2005
summary	It was one of the primary goals of the original Master’s programme in Computing and design at UEL in 1991 that we should work towards defining morphological generative processes for the conceptual design of architectural objects. These two papers offer a range of techniques which have been developed by two of this years MSc students (04-05) which show that we are getting close to this. The approaches range from computational geometric approaches (3d parametrics and voronoi diagrams) to emergent spatial organisation using agent based modelling. In many cases the resultant geometry is defined to the point where it can be transferred to advanced evaluation and fabrication systems, thus making this work sufficiently developed to begin to form a useful part in practical design processes.
keywords	morphology, computational geometry, particle systems, physical simulation, voronoi diagrams
series	other
type	normal paper
email
more	http://www.generativeart.com/
last changed	2012/09/20 18:39

_id	cdb1
authors	Cornick, T., Noble, B. and Hallahan, C.
year	1991
title	The Limitations of Current Working Practices on the Development of Computer Integrating Modelling in Construction
source	computer Integrated Future, CIB W78 Seminar. Calibre, The Netherlands: Eindhoven University of Technology, september, 1991. Unnumbered. includes bibliography
summary	For the construction Industry to improve its processes through the application computer-based systems, traditional working practices must first change to support the integrated control of design and construction. Current manual methods of practice accept the limitations of man to process a wide range of building performance and production information simultaneously. However when these limitations are removed, through the applications of computer systems, the constraints of manual methods need no longer apply. The first generation of computer applications to the Construction Industry merely modelled the divided and sequential processes of manual methods i.e. drafting, specification writing, engineering and quantity calculations, estimating, billing, material ordering data-bases and activity planning. Use of these systems raises expectations that connections within the computer between the processes modelled can actually be made and faster and more integrated information processing be achieved. 'Linking' software is then developed. The end result of this approach was that users were able to produce information faster, present it in an impressive manner but, in reality, no perceived improvement in actual building performance, production economy or efficiency was realized. A current government sponsored Teaching Company Programme with a UK design and build company is addressing the problem of how real economic benefit can be realized through improvement in, amongst other things, their existing computer applications. This work is being carried out by both considering an academic conceptual model of how 'designing for production' can be achieved in computer applications and what is immediately realizable in practice by modelling the integration of a limited number of knowledge domains to which computers are already being applied. i.e. billing from design, estimating and buying. This paper describes each area of work and how they are impacting on each other
keywords	construction, building process, integration
series	CADline
last changed	2003/06/02 13:58

_id	sigradi2016_710
id	sigradi2016_710
authors	Duarte, Rovenir Bertola; Lepri, Louisa Savignon; Sanches, Malu Magalh?es
year	2016
title	Objectile e o projeto paramétrico [Objectile and parametric design]
source	SIGraDi 2016 [Proceedings of the 20th Conference of the Iberoamerican Society of Digital Graphics - ISBN: 978-956-7051-86-1] Argentina, Buenos Aires 9 - 11 November 2016, pp.149-156
summary	The objectile was a concept developed by Deleuze and Cache in the 80s. It treats the object as a variable and anticipates the society of obsolescence, an inquiry about the contemporary life of the object (marketing, function, representation, modeling, production and consumption). This concept deals with the object where“... fluctuation of the norm replaces the permanence of a law; where the object assumes a place in a continuum by variation” (Deleuze, 1991, p.38). This paper proposes to think objectile as the object of the architectural design, on three types of approximations between design and objectile: (a) Objectile as variable of the design, (b) Objectile as a design variable, and (c) Objectile as architecture (variable architecture). The second approximation (b) enables to discuss the conception of continuous design with power to cross other projects - a meta-design. The main aspect of this meta-design is the variability, another way of control based on concepts of patterns and modulations; however, objectile can mean the release of mind for new types of thought and new kinds of design based on “continuum by variation”: meta-design.
keywords	Objectile; parametric design; Gilles Deleuze; Modulado; Digital design
series	SIGRADI
email
last changed	2021/03/28 19:58

_id	39a6
authors	Ellis, C.A., Gibbs, S.J. and Gail, L.
year	1991
title	Groupware: some issues and experiences
source	Communication of the ACM 34(l), pp. 38-58
summary	Groupware reflects a change in emphasis from using the computer to solve problems to using the computer to facilitate human interaction. This article describes categories and examples of group- ware and discusses some underlying research and development issues. GROVE, a novel group editor, is explained in some detail as a salient groupware example.
series	journal paper
last changed	2003/04/23 15:50

_id	403a
authors	Karstila, K., Björk, B.C. and Hannus, M.
year	1991
title	A Conceptual Framework for Design and Construction Information
source	The Computer Integrated Future, CIB W78 Seminar. september, 1991. Unnumbered : ill. includes bibliography
summary	This paper tries to sketch out a conceptual framework model for design and construction information. This conceptual model is formed by extending the Finnish RATAS building product data model to include also construction activities, resources, costs, organizations, contracts, etc. and relationships between them. The overall conceptual framework model can be used to extract conceptual submodels related to the information needs of particular participants of the construction process. As an example of different views to design and construction information the views of design, cost estimating and production planning discussed in the paper. The framework model can also be used to define the position of traditional classification systems and general databases in the construction information process
keywords	construction, product modeling, building, information, design process
series	CADline
email
last changed	2003/06/02 14:41

_id	2559
authors	Knight, Terry W.
year	1991
title	Designing with Grammars
source	Computer Aided Architectural Design Futures: Education, Research, Applications [CAAD Futures ‘91 Conference Proceedings / ISBN 3-528-08821-4] Zürich (Switzerland), July 1991, pp. 33-48
summary	Shape grammars that generate languages of designs have been used widely over the past several years to describe and understand a diversity of architectural and other styles of designs. These grammars have been developed to address two fundamental concerns in design: 1) the analysis of contemporary or historic styles of designs, and 2) the synthesis or creation of completely new and original styles of designs. Most applications of shape grammars so far have been concerned with analysis. The creative use of shape grammars - the use of grammars to invent new architectural or other designs - has not been exploited nearly as well. A new series of exercises for designing with shape grammars, and also with color grammars, is sketched informally here. These exercises are currently being used in classes in the Architecture and Urban Design Program at U.C.L.A.
series	CAAD Futures
last changed	1999/04/07 12:03

_id	diss_kuo
id	diss_kuo
authors	Kuo, C.J.
year	1999
title	Unsupervised Dynamic Concurrent Computer-Aided Design Assistant
source	Los Angeles: UCLA
summary	The increasing capability of computer-aided architectural design systems has strengthened the role that the computer plays in the workplace. Due to the complexity of developing new techniques and research, these systems are undertaken mostly by scientists and engineers without significant architectural input (Willey, 1991). The design concept of these systems may be based on a well-defined and well-understood process, which is not yet realized in architectural design (Galle, 1994). The output of such research may not be easily adapted into the design process. Most of the techniques assume a complete understanding of the design space (Gero and Maher, 1987) (Willey, 1991). The description or construction of the design space is always time and space consuming, and the result can never be complete due to the ever-changing nature of architectural design. This research intends to initiate a solution for the above problems. The proposed system is an unsupervised-dynamic-concurrent-computer-aided-design assistant. The “unsupervised” means the learning process is not supervised by the user because it is against the designer's nature to “think-aloud” in the design studio and it also increases the work load. It is dynamic because the size of the knowledge base is constantly changing. Concurrent means that there are multiple procedures active simultaneously. This research focuses on learning the operational knowledge from an individual designer and reapplying it in future designs. A computer system for this experiment is constructed. It is capable of The preliminary result shows a positive feedback from test subjects. The purpose of this research is to suggest a potent computational frame within which future developments may flourish.
series	thesis:PhD
last changed	2003/11/28 07:37

_id	c65f
authors	Littlefair, P.J.
year	1991
title	Site Layout Planning for Daylight and Sunlight
source	Building Research Establishment Report
summary	This guide gives advice on site layout planning to achieve good sunlight and daylight within buildings and adjacent open spaces such as gardens. It includes methods that allow for the calculation of sunlight or daylight levels at 4 different latitudes within the UK and for different times of the year. An additional section discusses the subject of site layout and design for obtaining maximum solar energy. This guide supersedes the original Department of the Environment document Sunlight and Daylight. BRE 209 has sections for the following:- * Light from the Sky. * New development. * Existing Buildings. * Adjoining development land. * Sunlighting. * New development. * Existing Buildings. * Gardens & open spaces. * Passive solar design. * Other issues. * View. * Privacy. * Security. * Access. * Enclosure. * Microclimate. * Solar dazzle. * Appendix A. Indicators to calculate access to sunlight, skylight and solar radiation. * Appendix B. A waldram diagram to calculate vertical sky component. * Appendix C. Interior daylighting recommendations. * Appendix D. Plotting the no-sky line. * Appendix E. Rights to light. * Appendix F. Setting alternative target values for skylight access. * Appendix G. Calculation of sun on the ground. * Appendix H. Definitions.
series	report
last changed	2003/04/23 15:14

_id	7508
authors	Montgomery, D.C.
year	1991
title	Design and Analysis of Experiments
source	John Wiley, Chichester
summary	Learn How to Achieve Optimal Industrial Experimentation Through four editions, Douglas Montgomery has provided statisticians, engineers, scientists, and managers with the most effective approach for learning how to design, conduct, and analyze experiments that optimize performance in products and processes. Now, in this fully revised and enhanced Fifth Edition, Montgomery has improved his best-selling text by focusing even more sharply on factorial and fractional factorial design and presenting new analysis techniques (including the generalized linear model). There is also expanded coverage of experiments with random factors, response surface methods, experiments with mixtures, and methods for process robustness studies. The book also illustrates two of today's most powerful software tools for experimental design: Design-Expert(r) and Minitab(r). Throughout the text, You'll find output from these two programs, along with detailed discussion on how computers are currently used in the analysis and design of experiments. You'll also learn how to use statistically designed experiments to: * Obtain information for characterization and optimization of systems * Improve manufacturing processes * Design and develop new processes and products * Evaluate material alternatives in product design * Improve the field performance, reliability, and manufacturing aspects of products * Learn how to conduct experiments effectively and efficiently Other important textbook features: * Student version of Design-Expert(r) software is available. * Web site (www.wiley.com/college/montgomery) offers supplemental text material for each chapter, a sample syllabus, and sample student projects from the author's Design of Experiments course at Arizona State University.
series	other
last changed	2003/04/23 15:14

_id	ga0010
id	ga0010
authors	Moroni, A., Zuben, F. Von and Manzolli, J.
year	2000
title	ArTbitrariness in Music
source	International Conference on Generative Art
summary	Evolution is now considered not only powerful enough to bring about the biological entities as complex as humans and conciousness, but also useful in simulation to create algorithms and structures of higher levels of complexity than could easily be built by design. In the context of artistic domains, the process of human-machine interaction is analyzed as a good framework to explore creativity and to produce results that could not be obtained without this interaction. When evolutionary computation and other computational intelligence methodologies are involved, every attempt to improve aesthetic judgement we denote as ArTbitrariness, and is interpreted as an interactive iterative optimization process. ArTbitrariness is also suggested as an effective way to produce art through an efficient manipulation of information and a proper use of computational creativity to increase the complexity of the results without neglecting the aesthetic aspects [Moroni et al., 2000]. Our emphasis will be in an approach to interactive music composition. The problem of computer generation of musical material has received extensive attention and a subclass of the field of algorithmic composition includes those applications which use the computer as something in between an instrument, in which a user "plays" through the application's interface, and a compositional aid, which a user experiments with in order to generate stimulating and varying musical material. This approach was adopted in Vox Populi, a hybrid made up of an instrument and a compositional environment. Differently from other systems found in genetic algorithms or evolutionary computation, in which people have to listen to and judge the musical items, Vox Populi uses the computer and the mouse as real-time music controllers, acting as a new interactive computer-based musical instrument. The interface is designed to be flexible for the user to modify the music being generated. It explores evolutionary computation in the context of algorithmic composition and provides a graphical interface that allows to modify the tonal center and the voice range, changing the evolution of the music by using the mouse[Moroni et al., 1999]. A piece of music consists of several sets of musical material manipulated and exposed to the listener, for example pitches, harmonies, rhythms, timbres, etc. They are composed of a finite number of elements and basically, the aim of a composer is to organize those elements in an esthetic way. Modeling a piece as a dynamic system implies a view in which the composer draws trajectories or orbits using the elements of each set [Manzolli, 1991]. Nonlinear iterative mappings are associated with interface controls. In the next page two examples of nonlinear iterative mappings with their resulting musical pieces are shown.The mappings may give rise to attractors, defined as geometric figures that represent the set of stationary states of a non-linear dynamic system, or simply trajectories to which the system is attracted. The relevance of this approach goes beyond music applications per se. Computer music systems that are built on the basis of a solid theory can be coherently embedded into multimedia environments. The richness and specialty of the music domain are likely to initiate new thinking and ideas, which will have an impact on areas such as knowledge representation and planning, and on the design of visual formalisms and human-computer interfaces in general. Above and bellow, Vox Populi interface is depicted, showing two nonlinear iterative mappings with their resulting musical pieces. References [Manzolli, 1991] J. Manzolli. Harmonic Strange Attractors, CEM BULLETIN, Vol. 2, No. 2, 4 -- 7, 1991. [Moroni et al., 1999] Moroni, J. Manzolli, F. Von Zuben, R. Gudwin. Evolutionary Computation applied to Algorithmic Composition, Proceedings of CEC99 - IEEE International Conference on Evolutionary Computation, Washington D. C., p. 807 -- 811,1999. [Moroni et al., 2000] Moroni, A., Von Zuben, F. and Manzolli, J. ArTbitration, Las Vegas, USA: Proceedings of the 2000 Genetic and Evolutionary Computation Conference Workshop Program – GECCO, 143 -- 145, 2000.
series	other
email
more	http://www.generativeart.com/
last changed	2003/08/07 17:25

_id	afe2
authors	Neilson, I., Tweed, C. and Vergopoulos, S.
year	1991
title	Computer Literacy and Architectural Education
source	Experiences with CAAD in Education and Practice [eCAADe Conference Proceedings] Munich (Germany) 17-19 October 1991
doi	https://doi.org/10.52842/conf.ecaade.1991.x.g6h
summary	The importance of some degree of computer literacy to the practice of architecture is constantly being emphasised yet what constitutes computer literacy in the context of architectural education has yet to be defined and appropriate guidelines for the teaching of CAD established. Currently the course structure of a CAD option is simply decided by the staff involved in teaching the option. Many course designs are possible, not all of which are likely to give equal educational returns. There is thus a need for empirical evaluation of existing course structures in order that the relative merits of the various possible designs may be usefully compared. This paper reports the outcome of one such study which focussed on student evaluation of the structure of the CAD option taught at Edinburgh.
series	eCAADe
last changed	2022/06/07 07:50

_id	9ad2
authors	Owen, J.C.
year	1991
title	Algebraic Solution for Geometry from Dimensional Constraints
source	ACM Symp. Found. of Solid Modeling, Austin TX, pp. 397-407
summary	We investigate general configurations of distance and angle dimensions between points, lines and circles on a plane. A simple graphical representation is described for the system of coupled ctuadratic equations which results from treating the geometries as variables and the dimensions as defining equations. For many configurations of practical interest we show that these equations are poorly suited to numerical solution. We describe an algorithm for computing the solution to a subset of all possible configurations of geometry and dimensions using purely algebraic methods (in fact the usual arithmetic operations plus square roots). We show that this algorithm solves for all configurations of a practically useful type and that it solves for any configuration which can in principle be solved using these algebraic operations. Specifically, we use the Galois theory of equations to show that the following statements are equivalent. 1. The geometry can be constructed in principle on a drawing board using a ruler and compasses. 2. The coordinates of the geometries can be computed algebraically using only arithmetic operations plus square root. 3. The coordinates of the geometries lie in a normal field extension over the dimension values of degree 2n for some n. 4. For general (i.e. algebraically independent) dimension values the algorithm described will compute the geometries. We also describe a working implementation of the algorithm and describe some extensions to the basic ideaa which are necessary to make it a practically useful way to specify geometry by means of dimensional constraints.
series	other
last changed	2003/04/23 15:50

_id	4d41
authors	Pittioni, Gernot
year	1991
title	Support of Structural Design
source	Experiences with CAAD in Education and Practice [eCAADe Conference Proceedings] Munich (Germany) 17-19 October 1991
doi	https://doi.org/10.52842/conf.ecaade.1991.x.j6f
summary	The tendency of using CAD-systems in the early phases of architectural design involve the need of advice tools to support the design process. Many influences have to be managed by the designer. This paper catches a glance on an experiment presently running, aiming at the support of structural design. The system is implemented on AutoCAD 10.0, using AutoLISP with the outlook on future C-interfacing with AutoCAD.
series	eCAADe
email
last changed	2022/06/07 07:50

_id	2abf
id	2abf
authors	Rafi, A
year	2001
title	Design creativity in emerging technologies
source	In Von, H., Stocker, G. and Schopf, C. (Eds.), Takeover: Who’s doing art of tomorrow (pp. 41-54), New York: SpringerWein.
summary	Human creativity works best when there are constraints – pressures to react to, to shape, to suggest. People are generally not very good at making it all up from scratch (Laurel, 1991). Emerging technology particularly virtual reality (VR) Multimedia and Internet is yet to be fully discovered as it allows unprecedented creative talent, ability, skill set, creative thinking, representation, exploration, observation and reference. In an effort to deliver interactive content, designers tend to freely borrow from different fields such as advertising, medicine, game, fine art, commerce, entertainment, edutainment, film-making and architecture (Rafi, Kamarulzaman, Fauzan and Karboulonis, 2000). As a result, content becomes a base that developers transfer the technique of conventional medium design media to the computer. What developers (e.g. artist and technologist) often miss is that to develop the emerging technology content based on the nature of the medium. In this context, the user is the one that will be the best judge to value the effectiveness of the content. The paper will introduce Global Information Infrastructure (GII) that is currently being developed in the Asian region and discuss its impact on the Information Age society. It will further highlight the ‘natural’ value and characteristics of the emerging technologies in particular Virtual Reality (VR), Multimedia and Internet as a guidance to design an effective, rich and innovative content development. This paper also argues that content designers of the future must not only be both artist and technologist, but artist and technologist that are aware of the re-convergence of art and science and context in which content is being developed. Some of our exploration at the Faculty of Creative Multimedia, Multimedia University will also be demonstrated. It is hoped that this will be the evidence to guide future ‘techno-creative designers’.
keywords	design, creativity, content, emerging technologies
series	book
type	normal paper
email
last changed	2007/09/13 03:46

_id	ddss9483
id	ddss9483
authors	Shyi, Gary C.-W. and Huang, Tina S.-T.
year	1994
title	Constructing Three-Dimensional Mental Models from Two-Dimensional Displays
source	Second Design and Decision Support Systems in Architecture & Urban Planning (Vaals, the Netherlands), August 15-19, 1994
summary	In the present study we adopted the tasks and the experimental procedures used in a recent series of study by Cooper (1990, 1991) for the purpose of examining how we utilized two-dimensional information in a line-drawing of visual objects to construct the corresponding three-dimensional mental structure represented by the 2-D displays. We expected that the stimulus materials we used avoided some of the problems that Cooper's stimuli had, and with that we examined the effect of complexity on the process of constructing 3-D models from 2-D displays. Such a manipulation helps to elucidate the difficulties of solving problems that require spatial abilities. We also investigated whether or not providing information representing an object viewed from different standpoints would affect the construction of the object's 3-D model. Some researchers have argued that 3-D models, once constructed, should be viewer-independent or viewpoint-invariant, while others have suggested that 3-D models are affected by the viewpoint of observation. Data pertinent to this issue are presented and discussed.
series	DDSS
last changed	2003/08/07 16:36

_id	b5be
authors	Stok, Leon
year	1991
title	Architectural synthesis and optimization of digital systems
source	Eindhoven University of Technology
summary	High level synthesis means going from an functional specification of a digits-system at the algorithmic level to a register transfer level structure. Different appli-cations will ask for different design styles. Despite this diversity in design styles many tasks in the synthesis will be similar. There is no need to write a new synthesis system for each design style. The best way to go seems a decomposition of the high level synthesis problems in several well defined subproblems. How the problem is decomposed depends heavily on a) the type of network architecture chosen, b) the constraints applied to the design and c) on the functional description itself. From this architecture style, the constraints and the functional description a synthesis scheme can be derived.Once this scheme is fixed, algorithms can be chosen which fit into this scheme and solve the subproblems in a fast and, when possible, optimal way. To support such a synthesis philosophy, a framework is needed in which all design information can be stored in a unique way during the various phases of the design process. This asks for a design data base capable of handling all design information with a formally defined interface to all design tools. This thesis gives a formal way to describe both the functional representation, the register transfer level structure and the controller and the relations between all three of them. Special attention has been paid to the efficient representation of mutual exclusive operations and array accesses. The scheduling and allocation problems are defined as mappings between these formal representations. Both the existing synthesis algorithms and the new algorithms described in this thesis fit into this framework. Three new allocation algorithms are presented in this thesis: an algorithm for optimal register allocation in cyclic data flow graphs, an exact polynomial algorithm to do the module allocation and a new scheme to minimize the number of interconnections during all stages of the data path allocation. Cyclic data flow graphs result from high level behavioral descriptions that contain loops. Algorithms for register allocation in high level synthesis published up till now, only considered loop free data flow graphs, When these algorithms are applied to data flow graphs with loops, unnecessary register transfer operations are introduced. A new algorithm is presented that performs a minimal register allocation and eliminates all superfluous register transfer operations. The problem is reformulated as a multicommodity network flow problem for which very efficient solutions exist. Experiments on a benchmark set have shown that in all test cases all register transfers could be eliminated at no increase in register cost. Only heuristic algorithms appeared in literature to solve the module allocation problem. The module allocation problem is usually defined as a clique cover problem on a so-called module allocation graph. It is shown that, under certain conditions, the module allocation graph belongs to the special class of comparability graphs. A polynomial time algorithm can optimally find a clique cover of such a graph. Even when interconnect weights are taken into account, this can be solved exactly. This problem can be transformed into a maximal cost network flow problem, which can be solved exactly in polynomial time. An algorithm is described which solves the module allocation problem with interconnect weights exactly, with a complexity O(kn2), where n is the number of operations In previous research, interconnection was optimized when the module allocation for the operations and the register allocation for the variables already had been done. However, the amount of multiplexing and interconnect are crucial factors to both the delay and the area of a circuit. A new scheme is presented to minimize the number of interconnections during the data path allocation. This scheme first groups all values based on their read and write times. Values belonging to the same group can share a register file. This minimizes the number of data transfers with different sources and destinations. Secondly, registers are allocated for each group separately. Finally the interconnect allocation is done. During the interconnect allocation, the module allocation is determined. The value grouping is based on edge coloring algorithms providing a sharp upper bound on the number of colors needed two techniques: splitting read and write phases of values and introducing serial (re-)write operations for the same value, make that even more efficient exact edge coloring algorithms can be used. It is shown that when variables are grouped into register files and operations are assigned to modules during the interconnection minimization, significant savings (20%) can be obtained in the number of local interconnections and the amount of global interconnect, at the expense of only slightly more register area.
keywords	Digital Systems; Digital Systems
series	thesis:PhD
email
last changed	2003/02/12 22:37

_id	bbdc
authors	Tang, J.C.
year	1991
title	Findings from observational studies of collaborative work
source	international Joumal of Man-Machine Studies, 34(2), 143-160
summary	The work activity of small groups of three to four people was videotaped and analyzed in order to understand collaborative work and to guide the development of tools to support it. The software tools we currently have are often based on a single user model. Even those that are based on multiple user models define structures of interaction that restrict fluid collaboration. We need observe how people collaborate then build software that facilitates collaboration based on those observations, giving the users the tools" that are "naturally" defined in face-to-face interaction. In this experiment small groups of people were observed in a collaborative design task using a shared drawing space. Specific features of collaborative work activity that raise design implications for collaborative technology: 1. collaborators use hand gestures to uniquely communicate significant information 2. the process of creating and using drawings conveys much information not contained in the resulting drawings 3. the drawing space is an important resource for the group in mediating their collaboration 4. there is a fluent mix of activity in the drawing space 5. the spatial orientation among the collaborators and the drawing space has a role in structuring their activity
series	other
last changed	2003/04/23 15:14

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