Parametric Object Model Research Articles

Specification of Objects for Modeling Information in Construction: A Study with Fire Doors

The study of Building Information Modeling (BIM) is driven by alternatives in information management support within the construction design process. It seeks to improve the budgeting and planning system of works and to reduce the rework and incompatibilities faced, automating works and consequently reducing costs. Faced with this no-longer two-dimensional universe, objects in BIM are classified according to their levels of development (LOD), i.e., the level specifying the content and stage of the information available for these models. The objective of this study was to create and enter properties in a parametric object model (using a "fire door" as example object), in addition to associating it with the levels of development according to the LOD classification developed by the American Institute of Architects - AIA. A significant amount of limitations was observed based on this classification, mostly related to the evolution of the BIM methodology in projects, since the process is still under development in Brazil.

Modeling and Identification of the Hydraulic Servo Drive

This paper discusses possibilities to apply the dynamic identification with a discrete linear model while assessing the state of the electro-hydraulic drive dynamics. This evaluation is crucial while designing modern power or positional control systems. Experimental data is applied in order to determine the model dynamics of the real system and estimate unknown parameters of an object model. The dependencies were interpreted. The paper includes the selected results of current identification tests of the electro-hydraulic drive system as a result of which the discrete parametric object model was derived.

GEODERM: geometric shape design system using an entity-relationship model

GEODERM, a microcomputer-based solid modeller, which incorporates the parametric object model, is discussed. The entity-relationship model, which is used to describe the conceptual schema of the geometric database, is also presented. Three of the four modules of GEODERM, which have been implemented are described in some detail. They are the Solid Definition Language (SDL), the Solid Manipulation Language (SML) and the User-System Interface.

Model-Based Restoration Procedure For Small, Low Resolution Optical Images

A deterministic model-based restoration procedure is presented. The algorithm is effective for the restoration of coarsely sampled images degraded by diffraction and noise. The a priori information, an assumed parametric object model, is used to arrive at the solution. The object model is convolved with the optical system and sensing mechanism degradations and then matched against the limited number of available samples. The unknown parameters are then estimated using a numerical least mean square error optimization procedure. The method has been tested with a double delta function model via digital simulations. A zero-mean, additive, white Gaussian background noise process was assumed. The technique requires a high signal-to-noise ratio (SNR) to resolve the doublet with a separation distance smaller than the detector width. With increasing separation, good restoration can be achieved at low SNR. The procedure is applicable to restore generalized objects.

A parametric man/machine interaction with semantic data

This paper describes a method of semantic data management in a geometric model (parametric object model). The semantic data introduced into the parametric object model realize an effective designer/system interaction in product design environments. The parametric object model with semantic data can solve such problems as similar product design problems, robot motion problems, design manufacturing data transfer problems, etc.