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

_id	e9e6
authors	Lowerre, Bruce and Reddy, Raj D.
year	1976
title	The Harpy Speech Understanding
source	1976. pp. 1-19
summary	Harpy is one of the first systems to demonstrate that high performance, large vocabulary connected speech recognition systems can in fact be realized economically for task- oriented (restricted) languages. In this chapter the authors present, using simple examples, the principles of organization of the Harpy system. They illustrate how knowledge sources (KSs) are specified, how the knowledge compiler integrates the KSs into a unified directional graph representation, and how this knowledge is utilized. In conclusion, they discuss many of the limitations of the present system and how these can be eliminated or reduced in future systems
keywords	speech recognition, AI
series	CADline
last changed	2003/06/02 10:24

_id	sigradi2023_333
id	sigradi2023_333
authors	Loyola, Mauricio
year	2023
title	Senior-meter: A Hands-on Intuitive Approach to Teaching Electronics and Data-Driven Design to Undergraduate Students
source	García Amen, F, Goni Fitipaldo, A L and Armagno Gentile, Á (eds.), Accelerated Landscapes - Proceedings of the XXVII International Conference of the Ibero-American Society of Digital Graphics (SIGraDi 2023), Punta del Este, Maldonado, Uruguay, 29 November - 1 December 2023, pp. 193–202
summary	This paper presents the development and implementation of a novel pilot course for undergraduate design students, with a focus on the integration of electronics and data-driven methodologies within the field of design. The course was structured around a real-world project that addressed the challenges encountered by senior individuals. It incorporated user-centered design principles, sensor-based data collection, real-world deployment, and data-based design assessment. The results demonstrated the successful application of data-driven methods, and an appreciation by students for the empirical foundation in design decisions. The pilot confirms that data-driven approaches can be successfully embedded within an undergraduate design program, offering valuable insights for educators interested in pursuing such integrative pedagogical methods.
keywords	Data Driven Design, Interface Design, Physical Computing, Design Analytics, Design Engineering.
series	SIGraDi
email
last changed	2024/03/08 14:06

_id	sigradi2017_045
id	sigradi2017_045
authors	Loyola, Mauricio; Sebastián Rozas, Sebastián Caldera
year	2017
title	Kerfing2: Una técnica para el diseño, fabricación y optimización de elementos de doble curvatura a partir de placas rígidas de madera [Kerfing2: A technique for the design, manufacture and optimization of double-curved elements from rigid wooden plates]
source	SIGraDi 2017 [Proceedings of the 21th Conference of the Iberoamerican Society of Digital Graphics - ISBN: 978-956-227-439-5] Chile, Concepción 22 - 24 November 2017, pp.307-313
summary	We present a novel technique for the design, optimization, and fabrication of plywood double-curvature building components, based on an ancient woodworking method known as kerfing. We explain the principles of geometric optimization, their implementation into computational algorithms, and show the first prototypes as proofs of concept (PoC).
keywords	CAD/CAM; Digital Fabrication; Kerfing; Complex Geometries
series	SIGRADI
email
last changed	2021/03/28 19:58

_id	f920
authors	Lozano, E. E.
year	1988
title	Visual needs in urban environments and physical planning
source	Environmental aesthetics: Theory, research, and applications. J. Nasar. New York, Cambridge University Press, pp. 395-421
summary	Contributed by Susan Pietsch (spietsch@arch.adelaide.edu.au)
keywords	3D City Modeling, Development Control, Design Control
series	other
last changed	2001/06/04 20:41

_id	caadria2018_322
id	caadria2018_322
authors	Lu, Hangxin, Gu, Jiaxi, Li, Jin, Lu, Yao, Müller, Johannes, Wei, Wenwen and Schmitt, Gerhard
year	2018
title	Evaluating Urban Design Ideas from Citizens from Crowdsourcing and Participatory Design
source	T. Fukuda, W. Huang, P. Janssen, K. Crolla, S. Alhadidi (eds.), Learning, Adapting and Prototyping - Proceedings of the 23rd CAADRIA Conference - Volume 2, Tsinghua University, Beijing, China, 17-19 May 2018, pp. 297-306
doi	https://doi.org/10.52842/conf.caadria.2018.2.297
summary	Participatory planning aims at engaging multiple stakeholders including citizens in various stages of planning projects. Adopting participatory design approach in the early stage of planning project facilitates the ideation process of citizens. We have implemented a participatory design study during the 2017 Beijing Design Week and have conducted an interactive design project called "Design your perfect Dashilar: You Place it!". Participants including local residents and visitors were asked to redesign the Yangmeizhu street, a historical street located in Dashilar area by rearranging the buildings of residential, commercial, administration, and cultural functionalities. Apart from using digital design tools, questionnaires, interviews, and sensor network were applied to collect personal preferences data. Computational approaches were used to extract features from designs and personal preferences. In this paper, we illustrate the implementation of the participatory design and the possible applications by combining with crowdsourcing. Participatory design data and citizens profiles with personal preferences were analysed and their correlations were computed. By using crowdsourcing and participatory design, this study shows that the digitalization of participatory design with data science perspective can indicate the implicit requirements, needs and design ideas of citizens.
keywords	Participatory design; Crowdsourcing; Human computation; Citizen Design Science; Human Computer Interaction
series	CAADRIA
email
last changed	2022/06/07 07:59

_id	cf2019_049
id	cf2019_049
authors	Lu, Heng; Chen Liu, Daekwon Park, Guohua Ji and Ziyu Tong
year	2019
title	Pneumatic Origami Joints A 3D Printed Flexible Joint
source	Ji-Hyun Lee (Eds.) "Hello, Culture!" [18th International Conference, CAAD Futures 2019, Proceedings / ISBN 978-89-89453-05-5] Daejeon, Korea, p. 432
summary	This paper describes the design and fabrication process of an adaptive joint using foldable 3D printed structures encased in heat-sealed synthetic polymer films (e.g. airtight plastic casing). The proposed joint can be pneumatically actuated using the airtight casing, and the shape of the deformation can be controlled using origami-inspired 3D printed structures. A zigzag-gap microstructure is designed for the connection portion of the origami structure inside the joint, in order that the rigid 3D printed material (PLA) acquires properties of mollusk material, such as flexibility and softness. Finally, the paper presents some applications adopting pneumatic origami joints which can interact with people or adapting indoor environment, and compares the advantages of this pneumatic technology with mechanical technology.
keywords	3D printing · Adaptive joint · Pneumatic architecture · Origami structure
series	CAAD Futures
email
last changed	2019/07/29 14:18

_id	caadria2020_377
id	caadria2020_377
authors	Lu, Ji Rong, Chang, Teng Wen and Wu, Yi Sin
year	2020
title	HIGAME+ - Planting as a medium to connect IOT objects in different environments to emotionally interact with elderly people alone
source	D. Holzer, W. Nakapan, A. Globa, I. Koh (eds.), RE: Anthropocene, Design in the Age of Humans - Proceedings of the 25th CAADRIA Conference - Volume 2, Chulalongkorn University, Bangkok, Thailand, 5-6 August 2020, pp. 273-282
doi	https://doi.org/10.52842/conf.caadria.2020.2.273
summary	Elderly living alone have less chance to communicate with their families, so they tend to feel lonely and lack well-being. This study uses gardening activities which is familiar to elderly as the behavioral medium. Make elderly people living alone and their children living in other places through the Internet of Things system to connect space off-site to emotional interaction. Connect children of elderly 'mobile phone apps to HiGame+ potted plants in the home environment of the elderly, so that family members can care and accompany the plants in the homes of the elderly without space restrictions. At the same time, the potted objects will also record the long-term behaviors of the elderly, and will be transformed into the visualization of mood information to interact with children of elderly from other places to break the limit of spatial distance. Give elderly living alone to be emotionally connected and interactive, to increase their well-being.
keywords	Elderly Living Alone; Emotional Interaction; Cross-Space Interaction; Internet of Things; Plant Care
series	CAADRIA
email
last changed	2022/06/07 07:59

_id	caadria2020_062
id	caadria2020_062
authors	Lu, Ming and Yuan, Philip F.
year	2020
title	A New Algorithm to Get Optimized Target Plane on 6-Axis Robot For Fabrication
source	D. Holzer, W. Nakapan, A. Globa, I. Koh (eds.), RE: Anthropocene, Design in the Age of Humans - Proceedings of the 25th CAADRIA Conference - Volume 2, Chulalongkorn University, Bangkok, Thailand, 5-6 August 2020, pp. 393-402
doi	https://doi.org/10.52842/conf.caadria.2020.2.393
summary	In usual robotic fabrication by 6 axis industrial robot such as KUKA ,ABB and other brands ,the usual robot's 4th ,5th and 6th axis is exactly converge in one point .When this type robot (pieper) is doing movement commands ,setting the degree of 4th axis close to zero is an ideal condition for motion stability ,especially for putting device which connect to tool head on 4th axis arm part.In plastic melting or others print which not cares the rotation angle about the printing direction(the printing direction means the effector's output normal direction vector, KUKA is X axis,ABB is Z axis) ,the optimization of 4th axis technology not only makes printing stable but also makes better quality for printing.The paper introduces a new algorithm to get the analytics solution.The algorithm is clear explained by mathematics and geometry ways. At the end of paper, a grasshopper custom plugin is provided ,which contains this new algorithm ,with this plugin, people can get the optimized target path plane more easily.
keywords	3D printing; brick fabrication; robotic; optimization algorithm; grasshopper plugin
series	CAADRIA
email
last changed	2022/06/07 07:59

_id	ecaade2021_014
id	ecaade2021_014
authors	Lu, Ming, Zhou, Xinjie, Zhou, Yifan, Zhang, Liming, Zhu, Weiran and Yuan, Philip F.
year	2021
title	Research on Realtime Communication and Control Workflow with Vision Feedback Integrated in Robotic Fabrication
source	Stojakovic, V and Tepavcevic, B (eds.), Towards a new, configurable architecture - Proceedings of the 39th eCAADe Conference - Volume 2, University of Novi Sad, Novi Sad, Serbia, 8-10 September 2021, pp. 145-152
doi	https://doi.org/10.52842/conf.ecaade.2021.2.145
summary	On-site construction is one of the main research directions of robot construction. Due to the complex and everchanging construction environment on the site, traditional offline programming and simple conditional programming cannot meet the needs of robot on-site construction at all. Realtime adjustment of the robot's operating program for the real-time situation in the field is the appropriate solution. Therefore, the real-time communication and control of robots has become a key issue for robot on-site construction. This article discusses in turn the way of robot offline program control through EthernetKRL and grasshopper. A remote real-time communication and control method for an on-site construction robot is studied, and the application of the method in the on-site construction process of an actual robot is introduced with the Wuzhen coffee kiosk project as an example. Based on the above methods, remote real-time monitoring of the construction robot on site can be realized, which provides a reference for the actual engineering application of the construction robot on site.
keywords	on-site; robot; fabrication; communication; sensor
series	eCAADe
type	normal paper
email
last changed	2022/06/07 07:59

_id	caadria2021_027
id	caadria2021_027
authors	Lu, Ming, Zhou, Yifan, Wang, Xiang and Yuan, Philip F.
year	2021
title	An optimization method for large-scale 3D printing - Generate external axis motion using Fourier series
source	A. Globa, J. van Ameijde, A. Fingrut, N. Kim, T.T.S. Lo (eds.), PROJECTIONS - Proceedings of the 26th CAADRIA Conference - Volume 1, The Chinese University of Hong Kong and Online, Hong Kong, 29 March - 1 April 2021, pp. 683-692
doi	https://doi.org/10.52842/conf.caadria.2021.1.683
summary	With the increase in labor costs, more and more robot constructions appear in building construction and spatial structure fabrication. There are many robots working on large-scale objects. When the reach range of the robot cannot meet the requirements, so an external axis is needed. The external axis is usually a linear motion device, which can significantly increase the operating range of the robotic arm. In actual construction, it is also widely used. This article introduces a 3d printing coffee bar project. Because this project is of a large scale and needs to be printed at one time, the XYZ external axis was used in this project to complete the task. Inspired by this project, this article study several methods of optimizing the motion of external axes in large-scale construction. Finally, we chose to use the Fourier series as the most suitable method to optimize the printing path and programed this method as a component of FUROBOT for more convenient use. This article explains the principle of this method in detail. Finally, this article uses a 3D printing example to illustrate the precautions in actual use.
keywords	robotics; motion optimize; Fourier series; 3D printing; external axis
series	CAADRIA
email
last changed	2022/06/07 07:59

_id	eaea2015_t1_paper06
id	eaea2015_t1_paper06
authors	Lu, Shaoming
year	2015
title	Port Heritage: Urban Memory of Harbor Cities (Case Study of Shanghai)
source	ENVISIONING ARCHITECTURE: IMAGE, PERCEPTION AND COMMUNICATION OF HERITAGE [ISBN 978-83-7283-681-6],Lodz University of Technology, 23-26 September 2015, pp.71-81
summary	Through literary review on historical ports from the 1st Opium War to 1949, this paper mainly focuses on the elements and value of modern ports along the Huangpu River from Baoshan to Minhang. These ports with historical events, places and objects are viewed as urban heritage to arise people’s attention to this kind of memory place during the process of urban transformation. Port heritage with unique material relics and immaterial information makes a great contribution to recalling the massive memory and making identity of the port city, which should be preserved definitely.
keywords	port heritage; urban memory
series	EAEA
email
last changed	2016/04/22 11:52

_id	caadria2018_067
id	caadria2018_067
authors	Lu, Shuai and Guo, Cong
year	2018
title	Investigation on the Potential of Improving Daylight Efficiency of Office Buildings by Optimized Curved Facades
source	T. Fukuda, W. Huang, P. Janssen, K. Crolla, S. Alhadidi (eds.), Learning, Adapting and Prototyping - Proceedings of the 23rd CAADRIA Conference - Volume 2, Tsinghua University, Beijing, China, 17-19 May 2018, pp. 113-121
doi	https://doi.org/10.52842/conf.caadria.2018.2.113
summary	With the rapid development of digital design methods, irregular curved shapes have been more and more widely used in buildings, which not only enriches the appearances of buildings, but also provide new possibilities of improving building performance by shape designs. However, existing researches regarding building performance and shapes mostly focus on regular shapes, while curved shapes are rarely explored. This paper aims to employ design optimization method to explore the improvement of building performance that curved shapes could contribute. Specifically, office buildings are chosen as an example and the potential of improving the daylight efficiency of them by optimized curved facades are investigated. Three major cities and two orientations are involved in the investigation. The results prove that curved facades do have significant potential to improve the daylight efficiency of office buildings, and an average improvement of 0.2032 is achieved by the optimized curved facades in the 6 cases conducted in this research in terms of the area-weighted average UDI (useful daylight illuminance) compared with the same building with plane facade.
keywords	Curved Facade; Daylight; Building Performance; Design Optimization; Office Building
series	CAADRIA
email
last changed	2022/06/07 07:59

_id	caadria2018_046
id	caadria2018_046
authors	Lu, Siliang and Cochran Hameen, Erica
year	2018
title	Integrated IR Vision Sensor for Online Clothing Insulation Measurement
source	T. Fukuda, W. Huang, P. Janssen, K. Crolla, S. Alhadidi (eds.), Learning, Adapting and Prototyping - Proceedings of the 23rd CAADRIA Conference - Volume 1, Tsinghua University, Beijing, China, 17-19 May 2018, pp. 565-573
doi	https://doi.org/10.52842/conf.caadria.2018.1.565
summary	As one of the most important building systems, HVAC plays a key role in creating a comfortable thermal environment. Predicted Mean Vote (PMV), an index that predicts the mean value of the votes of a large group of persons on the thermal sensation scale, has been adopted to evaluate the built environment. Compared to environmental factors, clothing insulation can be much harder to measure in the field. The existing research on real-time clothing insulation measurement mainly focuses on expensive infrared thermography (IR) cameras. Therefore, to ensure cost-effectiveness, the paper has proposed a solution consisting of a normal camera, IR and air temperature sensors and Arduino Nanos to measure clothing insulation in real-time. Moreover, the algorithm includes the initialization from clothing classification with pre-trained neural network and optimization of the clothing insulation calculation. A total of 8 tests have been conducted with garments for spring/fall, summer and winter. The current results have shown the accuracy of T-shirt classification can reach over 90%. Moreover, compared with the results with IR cameras and reference values, the accuracies of the proposed sensing system vary with different clothing types. Research shall be further conducted and be applied into the dynamic PMV-based HVAC control system.
keywords	clothing insulation; skin temperature; clothing classification; IR temperature sensor; Optimization
series	CAADRIA
email
last changed	2022/06/07 07:59

_id	caadria2019_530
id	caadria2019_530
authors	Lu, Siliang, Wang, Shihan, Cochran Hameen, Erica, Shi, Jie and Zou, Yue
year	2019
title	Comfort-Based Integrative HVAC System with Non-Intrusive Sensing in Office Buildings
source	M. Haeusler, M. A. Schnabel, T. Fukuda (eds.), Intelligent & Informed - Proceedings of the 24th CAADRIA Conference - Volume 1, Victoria University of Wellington, Wellington, New Zealand, 15-18 April 2019, pp. 785-794
doi	https://doi.org/10.52842/conf.caadria.2019.1.785
summary	Heating, ventilation and air-conditioning system plays a key role in shaping the built environment. The effective and efficient HVAC operations not only achieve energy savings but also create a more comfortable environment for occupant indoors. Since current HVAC systems with fixed schedules cannot guarantee the operation with high energy efficiency and provision of comfortable thermal environment for occupants, it is of great importance to develop new paradigm of HVAC system framework, especially in the open-plan office environment so that everyone could work under their preferred thermal environment. Moreover, compared to environment-related factors to thermal comfort, sensing systems for occupant-related factors such as clothing insulation, metabolic rate, skin temperature have not had standardized yet and most of sensing systems for occupant-related factors may either result in privacy issue or are too intrusive. Hence, it is necessary to develop a new non-intrusive and less private sensing framework for monitoring individual thermal comfort in real-time. Therefore, this paper proposes an integrative comfort-based personalized cooling system with the operation of the centralized systems in office buildings. The results show that such integrative and interactive HVAC system for workplaces has advantages over thermal comfort improvements and energy savings.
keywords	Adaptive thermal comfort; Non-intrusive personalized cooling system; Occupant-responsive HVAC control; Intelligent workplace
series	CAADRIA
email
last changed	2022/06/07 07:59

_id	caadria2020_257
id	caadria2020_257
authors	Lu, Yao, Birol, Eda Begum, Johnson, Colby, Hernandez, Christopher and Sabin, Jenny
year	2020
title	A Method for Load-responsive Inhomogeneity and Anisotropy in 3D Lattice Generation Based on Ellipsoid Packing
source	D. Holzer, W. Nakapan, A. Globa, I. Koh (eds.), RE: Anthropocene, Design in the Age of Humans - Proceedings of the 25th CAADRIA Conference - Volume 1, Chulalongkorn University, Bangkok, Thailand, 5-6 August 2020, pp. 395-404
doi	https://doi.org/10.52842/conf.caadria.2020.1.395
summary	3D lattice structures are gaining widespread application in multiple design fields. While the number of projects that utilize load-responsive inhomogeneous and anisotropic 3D lattices in design applications increase, accessible and effective algorithmic generation methodologies remain lacking. This paper addresses this gap by introducing a novel computational method for controlled load-responsive inhomogeneity and anisotropy in 3D lattice generation. The presented methods employ a responsive Ellipsoid Packing algorithm informed by the global tensor field of the packing geometry, followed by a Kissing Ellipsoids algorithm to generate the lattice. Load specific anisotropy and inhomogeneity in the ellipsoid packing process is achieved in response to the magnitude and directionality values of the global tensor field and specialized responsive lattices are easily generated. The proposed Ellipsoid Packing workflow is compared to various common lattice generation algorithms. Results show improvement in mechanical performance.
keywords	3D lattice; ellipsoid packing; bio-inspired; algorithmic design; ceramic brick
series	CAADRIA
email
last changed	2022/06/07 07:59

_id	acadia22pr_166
id	acadia22pr_166
authors	Lu, Yao; Seyedahmadian, Alireza; Chhadeh, Philipp Amir; Cregan, Matthew; Bolhassani, Mohammad; Schneider, Jens; Yost, Joseph Robert; Brennan, Gareth; Akbarzadeh, Masoud
year	2022
title	Tortuca: An Ultra-Thin Funicular Hollow Glass Bridge
source	ACADIA 2022: Hybrids and Haecceities [Projects Catalog of the 42nd Annual Conference of the Association of Computer Aided Design in Architecture (ACADIA) ISBN 979-8-9860805-7-4]. University of Pennsylvania Stuart Weitzman School of Design. 27-29 October 2022. edited by M. Akbarzadeh, D. Aviv, H. Jamelle, and R. Stuart-Smith. 166-171.
summary	Designed with Polyhedral Graphic Statics (PGS), a geometry-based structural form-finding method, Tortuca presents an efficient and innovative structural system constructed by the dry assembly of thirteen hollow glass units (HGU). It also proposes a new language for glass that is carefully treated, structurally informed, fabrication-aware, and environmentally responsible.
series	ACADIA
type	project
email
last changed	2024/02/06 14:06

_id	ddss2006-pb-235
id	DDSS2006-PB-235
authors	Luca Caneparo, Francesco Guerra, and Elena Masala
year	2006
title	UrbanLab - Generative platform for urban and regional design
source	Van Leeuwen, J.P. and H.J.P. Timmermans (eds.) 2006, Progress in Design & Decision Support Systems in Architecture and Urban Planning, Eindhoven: Eindhoven University of Technology, ISBN-10: 90-386-1756-9, ISBN-13: 978-90-386-1756-5, p. 235-251
summary	UrbanLab is a computer system supporting urban and regional design. The papers outlines two leading aspects of this large research project, aimed respectively to make explicit the dynamic of the design in its time and geographic dimensions, and to interactively represent the interplay of some, explicitly, recognised factors, for instance the role of a multitude of different (local) actors in the design process. UrbanLab has been applied to several projects at different scales. We consider the applications to dynamically and interactively generating models of an Alpine valley. The modelling in the spatial and temporal dimensions provided us with the elements to study the evolution over the next twenty years.
keywords	Generative modelling, Participatory design, DSS, GIS, Software agent, Urban design, Regional design
series	DDSS
last changed	2006/08/29 12:55

_id	ddss9208
id	ddss9208
authors	Lucardie, G.L.
year	1993
title	A functional approach to realizing decision support systems in technical regulation management for design and construction
source	Timmermans, Harry (Ed.), Design and Decision Support Systems in Architecture (Proceedings of a conference held in Mierlo, the Netherlands in July 1992), ISBN 0-7923-2444-7
summary	Technical building standards defining the quality of buildings, building products, building materials and building processes aim to provide acceptable levels of safety, health, usefulness and energy consumption. However, the logical consistency between these goals and the set of regulations produced to achieve them is often hard to identify. Not only the large quantities of highly complex and frequently changing building regulations to be met, but also the variety of user demands and the steadily increasing technical information on (new) materials, products and buildings have produced a very complex set of knowledge and data that should be taken into account when handling technical building regulations. Integrating knowledge technology and database technology is an important step towards managing the complexity of technical regulations. Generally, two strategies can be followed to integrate knowledge and database technology. The main emphasis of the first strategy is on transferring data structures and processing techniques from one field of research to another. The second approach is concerned exclusively with the semantic structure of what is contained in the data-based or knowledge-based system. The aim of this paper is to show that the second or knowledge-level approach, in particular the theory of functional classifications, is more fundamental and more fruitful. It permits a goal-directed rationalized strategy towards analysis, use and application of regulations. Therefore, it enables the reconstruction of (deep) models of regulations, objects and of users accounting for the flexibility and dynamics that are responsible for the complexity of technical regulations. Finally, at the systems level, the theory supports an effective development of a new class of rational Decision Support Systems (DSS), which should reduce the complexity of technical regulations and restore the logical consistency between the goals of technical regulations and the technical regulations themselves.
series	DDSS
last changed	2003/08/07 16:36

_id	ddssup9615
id	ddssup9615
authors	Lucardie, L., de Gelder, J. and Duursma, C.
year	1996
title	Matching the Knowledge Needs of Trade and Industry: Advanced and Operational Knowledge Based Systems
source	Timmermans, Harry (Ed.), Third Design and Decision Support Systems in Architecture and Urban Planning - Part two: Urban Planning Proceedings (Spa, Belgium), August 18-21, 1996
summary	Complex tasks that are being performed in trade and industry such as diagnosis, engineering and planning, increasingly require rapid and easy access to large amounts of complicated knowledge. To cope with these demands on trade and industry, advanced automated support for managing knowledge seems to be needed. Knowledge based systems are claimed to match these needs. However, to deal with the vast volume and complexity of knowledge through knowledge based systems, preconditions at three computer systems levels should be fulfilled. At the first level, called the knowledge level, the development of knowledge based systems requires a well-elaborated theory of the nature of knowledge that helps to get a clear and consistent definition of knowledge. By providing guidelines for selecting and developing methodologies and for organising the mathematical functions underlying knowledge representation formalisms, such a definition significantly advances the process of knowledge engineering. Here, we present the theory of functional object-types as a theory of the nature of knowledge. At the second level, called the symbol level, the representation formalisms used must be compatible with the chosen theory of the nature of knowledge. The representation formalisms also have to be interpretable as propositions representing knowledge, so that their knowledge level import can be assessed. Furthermore, knowledge representation formalisms have to play a causal role in the intelligent behaviour of the knowledge based system. At the third level, called the systems level, a knowledge based system should be equipped with facilities that enable an effective management of the representation formalisms used. Yet other system facilities are needed to allow the knowledge base to communicate with existing computer systems used in the daily practice of trade and industry, for instance Database Management Systems, Geographical Information Systems and Computer Aided Design Systems. It should be taken into account that these systems may run in different networks and on different operating systems. A real-world knowledge based system that operates in the field of soil contamination exemplifies the development of an advanced and operational knowledge-based system that complies with the preconditions at each computer systems level.
series	DDSS
last changed	2003/08/07 16:36

_id	ddss9463
id	ddss9463
authors	Lucardie, Larry
year	1994
title	A Functional Framework For Conceptual Modelling
source	Second Design and Decision Support Systems in Architecture & Urban Planning (Vaals, the Netherlands), August 15-19, 1994
summary	A conceptual model is not only indispensable for the design and implementation of knowledge based systems, but also for their validation, modification, maintenance and enhancement. Experience indicates, however, that in many cases reality is not well reflected in a full-fledged conceptual model. What is systematically lacking in the prevailing conceptualization methods is a well-developed theory of knowledge that underlies conceptualization methods: a theory that precedes the process of forming meaningful classifications and that precedes the specification of a conceptual model. To date, conceptualization methods are based on the probabilistic assumption that, in essence, all conditions necessary for creating a classification, are provided initially and can easily be revealed by utilizing mathematical measures of similarity. Another frequently occurring prototypical assumption is that for creating a classification, necessary conditions are sufficient. Furthermore, it is assumed that the categories of conditions are a priori fixed and unconditional. That conceptualizing takes place without any explicit background knowledge about goals of classifications and without contextual influences and that categorizations have an unconditional status are not viewed as problems. In contrast to these approaches, the functional view states that relevant descriptive attributes are not necessarily a priori given but should be acquired through knowledge about goals of classifications and about contexts. It is also asserted that an explicit concern for necessary conditions will not suffice for capturing the dynamics of reality. Furthermore, the functional view puts forward that a goal- and context-oriented strategy leads to the reconstruction of new attributes and categorizations with a dynamic status. The aim of this paper is to discuss the theoretic and practical merits of the functional view compared to the probabilistic and prototype approaches. Conceptual models developed in the Computer Integrated Manufacturing-Project will serve as illustrations for the main ideas.
series	DDSS
email
last changed	2003/08/07 16:36

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