Shape Preserving Global Parameterization for CAD/CAM/CAE

2004 ◽  
Author(s):  
Chen-Han Lee ◽  
Lingyun Lu ◽  
Jon Dym ◽  
Guangyan Yin
Keyword(s):  
Parameter Space ◽  
Physical Space ◽  
Shape Preserving ◽  
Parameter Spaces ◽  
Individual Parameter ◽  
Global Parameter ◽  
Cad Cam ◽  
The Individual ◽  
Closed Shells

CAD/CAM/CAE applications often deal with open or closed shells of faces (surfaces). Each face has it’s own 2-D parameter space that may not be rectangular. In many applications we need to merge the individual parameter spaces into a single global parameter space that resembles the model shape in the 3-D physical space. In this paper, we present a method of building such shape-preserving global parameterization (of a shell of faces) that is suitable for CAD/CAM/CAE applications.

scholarly journals Sparse tensor discretizations of high-dimensional parametric and stochastic PDEs

Acta Numerica ◽  
2011 ◽  
Vol 20 ◽  
pp. 291-467 ◽  
Author(s):  
Christoph Schwab ◽  
Claude Jeffrey Gittelson
Keyword(s):  
Parameter Space ◽  
Convergence Rates ◽  
Sufficient Conditions ◽  
Physical Space ◽  
Random Coefficients ◽  
Regularity Of Solutions ◽  
Stochastic Pdes ◽  
Dimensional Parameter ◽  
Parameter Spaces ◽  
Multi Level

Partial differential equations (PDEs) with random input data, such as random loadings and coefficients, are reformulated as parametric, deterministic PDEs on parameter spaces of high, possibly infinite dimension. Tensorized operator equations for spatial and temporal k-point correlation functions of their random solutions are derived. Parametric, deterministic PDEs for the laws of the random solutions are derived. Representations of the random solutions' laws on infinite-dimensional parameter spaces in terms of ‘generalized polynomial chaos’ (GPC) series are established. Recent results on the regularity of solutions of these parametric PDEs are presented. Convergence rates of best N-term approximations, for adaptive stochastic Galerkin and collocation discretizations of the parametric, deterministic PDEs, are established. Sparse tensor products of hierarchical (multi-level) discretizations in physical space (and time), and GPC expansions in parameter space, are shown to converge at rates which are independent of the dimension of the parameter space. A convergence analysis of multi-level Monte Carlo (MLMC) discretizations of PDEs with random coefficients is presented. Sufficient conditions on the random inputs for superiority of sparse tensor discretizations over MLMC discretizations are established for linear elliptic, parabolic and hyperbolic PDEs with random coefficients.

scholarly journals Characterisation of the Filler Fraction in CAD/CAM Resin-Based Composites

Materials ◽  
2021 ◽  
Vol 14 (8) ◽  
pp. 1986
Author(s):  
Andreas Koenig ◽  
Julius Schmidtke ◽  
Leonie Schmohl ◽  
Sibylle Schneider-Feyrer ◽  
Martin Rosentritt ◽  
...  
Keyword(s):  
Computer Aided Design ◽  
Point Of View ◽  
Specific Information ◽  
Dental Resin ◽  
X Ray ◽  
Computer Aided ◽  
Cad Cam ◽  
Filler Fraction ◽  
The Individual ◽  
Aided Design

The performance of dental resin-based composites (RBCs) heavily depends on the characteristic properties of the individual filler fraction. As specific information regarding the properties of the filler fraction is often missing, the current study aims to characterize the filler fractions of several contemporary computer-aided design/computer-aided manufacturing (CAD/CAM) RBCs from a material science point of view. The filler fractions of seven commercially available CAD/CAM RBCs featuring different translucency variants were analysed using Scanning Electron Microscopy (SEM) with Energy Dispersive X-ray Spectroscopy (EDS), Micro-X-ray Computed Tomography (µXCT), Thermogravimetric Analysis (TG) and X-ray Diffractometry (XRD). All CAD/CAM RBCs investigated included midifill hybrid type filler fractions, and the size of the individual particles was clearly larger than the individual specifications of the manufacturer. The fillers in Shofu Block HC featured a sphericity of ≈0.8, while it was <0.7 in all other RBCs. All RBCs featured only X-ray amorphous phases. However, in Lava Ultimate, zircon crystals with low crystallinity were detected. In some CAD/CAM RBCs, inhomogeneities (X-ray opaque fillers or pores) with a size <80 µm were identified, but the effects were minor in relation to the total volume (<0.01 vol.%). The characteristic parameters of the filler fraction in RBCs are essential for the interpretation of the individual material’s mechanical and optical properties.

Surface Roughness of Two CAD/CAM Restorative Materials as Affected by Chewing Simulation v1

2022 ◽  
Author(s):  
eaeldwakhly not provided
Keyword(s):  
Surface Roughness ◽  
Computer Aided Design ◽  
Surface Characteristics ◽  
Ceramic Materials ◽  
Study Groups ◽  
Significance Level ◽  
Chewing Simulation ◽  
Computer Aided ◽  
Cad Cam ◽  
The Individual

This study was conducted to assess the surface characteristics in terms of roughness of two CAD/CAM (Computer-Aided-Design/Computer-Aided Manufacturing)restorative material spre and post chewing simulation exposure. Methods: Specimens were prepared from two CAD/CAM ceramic materials: Cerec Blocs C and IPS e-max ZirCAD. A total of 10 disks were prepared for each study group. 3D optical noncontact surface profiler was used to test the surface roughness (ContourGT, Bruker, Campbell, CA, USA). A silicone mold was used to fix the individual samples using a self-curing resin. Surface roughness (SR) was examined pre and post exposure to chewing simulation. 480,000 simulated chewing cycles were conducted to mimic roughly two years of intraoral clinical service. The results data was first tested for normality and equal variance (Levene’s test >0.05) then examined with paired and independent sample t-test at a significance level of (p < 0.05). Results:The two CAD-CAM materials tested exhibited increased surface roughness from baseline. The highest mean surface roughness was observed in Cerec blocs C group after chewing simulation (2.34 µm± 0.62 µm). Whereas the lowest surface roughness was observed in IPS e.max ZirCAD group before chewing simulation (0.42 µm± 0.16 µm). Both study groups exhibited significantly different surface roughness values (p< 0.05). There was a statistically higher surface roughness values after the chewing simulation in Cerec blocs C when compared to IPS e.max ZirCAD groups (p = 0.000).Conclusion:Even though both tested CAD/CAM materials differ in recorded surface roughness values, results were within clinically accepted values.

HUNIAN VERTIKAL MONODUALISME (INDIVIDUALISME-KOLEKTIVISME)

2021 ◽  
Vol 3 (1) ◽  
pp. 1111
Author(s):  
Hidayatul Reza ◽  
Franky Liauw
Keyword(s):  
Social Life ◽  
Physical Space ◽  
Personal Space ◽  
Small Community ◽  
Social Force ◽  
Human Needs ◽  
Self Actualization ◽  
Basic Human Needs ◽  
The Individual ◽  
Self Potential

The conflict between the two social understandings between individualism and collectivism does not need to be clashed, but instead it needs to be managed according to values, morals and ethics. So that it can become a social force for social life. In this issue, architects can play a role in cultivating a 'space' that is fit to the problem of individualism-collectivism. The research method used is a comparative and synergistic method. Literature in the form of journals and books on the phenomenon of individualism-collectivism is used as a reference and comparison. To be able to change a person's attitude, it is necessary to have an environmental role that creates events and events that occur repeatedly and continuously, gradually being absorbed into the individual and influencing the formation of an attitude. In order for this approach to be applied easily, this approach must be applied to basic human needs. In basic human needs there is a hierarchy of the most basic, namely physiological needs, the most basic needs to be fulfilled because they include things that are vital for survival, namely, clothing, food, and shelter. So in order to answer this issue, the vertical housing function is fixed. In addition, vertical housing is considered important because it responds to limited land and the increasing human population. Vertical housing with a collaborative space in grouped dwelling unit concept, because offers many possibilities, from people who live together sharing physical space to communities that share values, interests and philosophies of life. Grouping system is also be an important value and in community prefer to live in small community amount 4-10 members with various background. Consisted by good quality personal space and supporting facilities to develop self-potential as self-actualization. Keywords:  collaborative; collectivism; individualism; monodualism; self actualization Abstrak Konflik dua paham sosial antara individualisme dengan kolektivisme tidak perlu dibenturkan, tetapi justru perlu dikelola menurut nilai-nilai, moral, dan etika, sehingga dapat menjadi kekuatan sosial bagi kehidupan bermasyarakat. Dalam isu ini, arsitek dapat berperan dalam mengolah ‘ruang’ yang fit terhadap permasalahan individualisme-kolektivisme. Metode penelitian yang digunakan adalah metode komparatif dan sinergis. Literatur berupa jurnal dan buku tentang fenomena individualisme-kolektivisme, dijadikan sebagai acuan dan pembanding. Untuk dapat mengubah sikap seseorang diperlukan peran lingkungan untuk menciptakan kejadian-kejadian dan peristiwa-peristiwa yang terjadi berulang-ulang dan terus-menerus, lama-kelamaan secara bertahap diserap kedalam diri individu dan memengaruhi terbentuknya suatu sikap. Agar pendekatan ini dapat diterapkan dengan mudah maka pendekatan ini harus diterapkan pada kebutuhan dasar manusia. Pada kebutuhan dasar manusia terdapat hierarki yang paling dasar yaitu kebutuhan fisiologis (physiological needs), kebutuhan yang paling dasar untuk dipenuhi karena meliputi hal-hal yang vital bagi kelangsungan hidup yaitu, sandang, pangan, dan papan. Sehingga untuk menjawab isu ini, ditetapkan fungsi hunian vertikal. Selain itu, hunian vertikal dinilai penting karena untuk mejawab keterbatasan lahan dan semakin tingginya populasi manusia. Hunian vertikal dengan mengusung konsep ruang kolaboratif pada setiap unit hunian yang dikelompokkan, karena menawarkan banyak kemungkinan, mulai dari orang-orang yang tinggal bersama dengan berbagi ruang fisik hingga komunitas yang juga berbagi nilai, minat, dan filosofi hidup. Sistem pengelompokan penghuni juga menjadi nilai penting dan dalam komunitas lebih menyukai jumlah yang sedikit 4-10 orang dengan latar belakang yang berbeda. Ditunjang dengan kualitas ruang pribadi yang baik dan fasilitas penunjang yang dapat mengembangkan potensi sebagai bentuk aktualisai diri.

scholarly journals The architecture of network collective intelligence : correlations between social network structure, spatial layout and prestige outcomes in an office

2018 ◽  
Vol 373 (1753) ◽  
pp. 20170238 ◽  
Author(s):  
Felichism Kabo
Keyword(s):  
Social Network ◽  
Network Structure ◽  
Collective Intelligence ◽  
Physical Space ◽  
Spatial Layout ◽  
Spatial Proximity ◽  
Cross Sectional ◽  
Interdisciplinary Approaches ◽  
Level I ◽  
The Individual

A social network represents interactions and knowledge that transcend the intelligence of any of its individual members. In this study, I examine the correlations between this network collective intelligence , spatial layout, and prestige or status outcomes at the individual and team levels in an organization. I propose that spatially influenced social cognition shapes which individuals become members of prestigious teams in organizations, and the prestige perception of teams by others in the organization. Prestige is a pathway to social rank, influence and upward mobility for individuals in organizations. For groups, perceived prestige of work teams is related to how team members identify with the group and with their collaborative behaviours. Prestige enhances a team's survivability and its access to resources. At the individual level, I ran two-stage Heckman sample selection models to examine the correlation between social network position and the number of prestigious projects a person is a member of, contingent on the association between physical space and social ties and networks. At the team level, I used linear regressions to examine the relationship among network structure, spatial proximity and the perceived prestige or innovativeness of a project team. In line with my hypotheses, for individuals there is a significant correlation between physical space and social networks, and contingent on that, between social network positions and the number of prestigious projects that a person is a member of. Also in accordance with my hypotheses, for teams there is a significant correlation between network structure and spatial proximity, and perceived prestige. While cross-sectional, the study findings illustrate the importance of considering the spatial domain in examinations of how network collective intelligence is related to organizational outcomes at the individual and team levels. This article is part of the theme issue ‘Interdisciplinary approaches for uncovering the impacts of architecture on collective behaviour’.

Text and Discourse Linguistic Creativity of Children's English-Language Adventure Fiction

2021 ◽  
pp. 5-15
Author(s):  
Maria I. Kiose ◽  
◽  
Keyword(s):  
Vector Space ◽  
English Language ◽  
Total Sample ◽  
Word Formation ◽  
Statistics Analysis ◽  
Individual Parameter ◽  
Creativity Assessment ◽  
Adventure Fiction ◽  
The Individual ◽  
Parameter Values

The article explores the specificity of linguistic creativity in the discourse of children's English-language adventure fiction of the 1950s. The aim of the research is to develop the parametrization and vector-space method of discourse and text linguistic creativity assessment to evaluate the linguistic creativity potential of individual texts displaying similar discourse features. To serve as the research data three discourse fragments were selected, which represent three basic narrative types, Orientation, Complicating Actions, Evaluation and Resolution. To achieve the aim, the author applies the procedure of parametrization analysis followed by general and analytic statistics analysis and vector-space modelling. With the system of 52 parameters featuring linguistic creativity in phonology, word-formation, morphology, lexicology and phraseology, syntax, and graphics, the author manually annotates and processes the discourse fragments of similar size exemplifying three narrative types of adventure fiction literature, with the total sample size of 55,000 characters. General statistics analysis allowed revealing the absolute and relative parameter values in three discourse fragments and defining the relative parametric activity of single parameters and parameter levels. Analysis of variance helped define the correlation indices of parameter paired combinations, which resulted in detecting significant binary parameter groups . Individual parameter values and their binary groups served to construe the vector-space models of discourse and text linguistic creativity for the discourse narrative types under consideration. Thus, the author obtained an efficient instrument for discourse linguistic creativity evaluation and, furthermore, for assessing the potential of each individual text in terms of displaying stronger or weaker correlation with the vector coordinates of the discourse linguistic creativity vector-space model. With the frequency and variance analysis, the author disclosed two types of discourse linguistic creativity performance techniques, that is the individual parameter activation and the parameter synchronization. Both must be considered when the decision on linguistic creativity assessment in a concrete text is made. The resulting model shows that the parameter values of linguistic creativity in individual texts can manifest themselves in appearing both higher and lower than the reference parameter values of discourse creativity, which can contribute to disclosing new directions in creativity processing and understanding.

Study of Changes of the Individual Parameter of Resources in the Modelling of Renewable Systems

2019 ◽  
pp. 19-28
Author(s):  
Oleksandr Karelin ◽  
Anna Tarasenko ◽  
Oleksandr Barabash ◽  
Manuel Gonzalez-Hernandez ◽  
Joselito Medina-Marin
Keyword(s):  
Individual Parameter ◽  
The Individual

3D Virtual Worlds

2013 ◽  
pp. 194-213 ◽  
Author(s):  
Sean Goggins ◽  
Matthew Schmidt ◽  
Jesus Guajardo ◽  
Joi L. Moore
Keyword(s):  
Virtual Worlds ◽  
Physical Space ◽  
Environment Design ◽  
Distributed Work ◽  
Gaming Industry ◽  
3 Dimensional ◽  
Tool Evaluation ◽  
3D Virtual Worlds ◽  
The Individual ◽  
Collaboration Technologies

Teams meet in 3D virtual worlds more frequently than ever before, yet the tools for evaluating 3D collaboration environments are underdeveloped. To close the 3D collaboration tool evaluation gap, the authors integrate lessons from the gaming industry and distributed work research. They develop two complementary approaches. First, the individual user’s perspective using eye-tracking (ET) is addressed, and second, the collaborative experience of the group using a technique called All-Views-Qualitative-Analysis (AVQA) is evaluated. The latter integrates the points-of-view of all subjects in a small group collaborating on a creative work task in a 3 dimensional virtual world. The authors show how these techniques enable evaluation of 3D environment design from the perspective of human computer interaction theory and theories related to distributed work. The paper discusses why designers should seek ways to leverage the advantages of 3D collaboration technologies and avoid recreating mirrors of physical space in these environments.

Robotic Solutions Applied to Production and Measurement of Marine Propellers

2012 ◽  
Author(s):  
Javier Cavada ◽  
Fernando Fadón
Keyword(s):  
Industrial Robots ◽  
Cell Alignment ◽  
Marine Propellers ◽  
Tool Positioning ◽  
Cad Cam ◽  
Principal Factors ◽  
Propeller Blades ◽  
The Individual ◽  
Accuracy And Repeatability ◽  
Individual Design

Over the past decades, robots have emerged as a valuable technological solution for multiple highly complex industrial processes, and the manufacture of marine propellers has not been an exception. Majority of the propellers being produced worldwide are custom-designed products aiming to satisfy each ship’s propulsion requirements. Such geometrical diversity is a considerable challenge when traditionally manual manufacturing processes like hand-grinding and polishing need to be automated. In several market-leading propeller manufacturers within Europe and Asia, industrial robots are being applied for widely diverse operations such as milling polystyrene blocks to make moulding patterns, grinding out the excess material in the blade surfaces, or polishing the complete propellers’ surface before their final verification. Propeller blades are customized products, formed by curved and warped surfaces, requiring minimum 5 axes to be smoothly polished, and this can be easily achieved with a robot cell where the CAD/CAM data coming from the individual design are directly translated into robotic parameters. While this solution has demonstrated to be perfectly capable to comply with the marine propellers finishing tolerances, which are internationally defined by ISO 484 standard rules [6], robotic solutions for propeller measurement have not been successfully implemented within this specific industry due to reasons like lack of accuracy and repeatability. This paper analyses the root causes behind this problem, identifying the calibration process, the cell alignment method and the tool positioning as the principal factors resulting in this low measuring repeatability. Findings explained by the authors are the outcome of several practical measuring tests made on real marine propellers within ABB and Fanuc robot cells. This paper concludes offering solutions to reduce the inaccuracies caused by the mentioned factors, and recommending what type of marine propellers are more suitable to be measured with industrial robots, on the basis of ISO 484 requirements for each customized design. Moreover, suggestions for further research on this specific measuring application are provided in the concluding chapter.

On Travel Behaviour Relative to a General Place Utility Field

1994 ◽  
Vol 26 (9) ◽  
pp. 1455-1474 ◽  
Author(s):  
R G V Baker
Keyword(s):  
Hermitian Matrix ◽  
Physical Space ◽  
Travel Behaviour ◽  
Route Selection ◽  
Preference Formation ◽  
Spatial Preference ◽  
Psychological Domain ◽  
The Individual ◽  
Transfer Of Information ◽  
Over Time

The character of a trip from an origin to a destination is defined by the quasi-utility functions of place utility, trip assessment, and destination expectation. A specific place utility field is determined by a distance minimisation strategy and is generalised for a trip to a destination in any direction with a constant utility. This field is formed by assessing the direction of all trip possibilities and is shown to form rotations with discrete indexes in the psychological domain. The problem is that these trajectories imply that the individual has no memory of past trips, as for stability they tend to zero over time. A solution is to develop an analogy to a conservation principle (such as in physics) and rewrite the spatial preference results as quantum postulates. The rotations are interpreted as a Hermitian matrix and sets of commutation relations are developed for the transfer of information between psychological and physical space. The major results from this formulation are, first, that the velocity of the trip is critical in determining the uncertainty of the transformation of utility from the psychological domain. Second, the individual's speed is related to the probability of route selection. An equation is defined for the trip in a general place utility field and the result is applied to illustrate the initial spatial preference formation and the axis of indifference. It is shown that an individual with no place utility will resort to maximising choice at a point with the most destination alternatives.

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