scholarly journals The impact of generalized symmetry on computer-aided design of cascaded structures

1980 ◽  
Vol 8 (4) ◽  
pp. 445-455
Author(s):  
J. W. Bandler ◽  
R. M. Biernacki ◽  
M. R. M. Rizk
Keyword(s):  
Computer Aided Design ◽  
Generalized Symmetry ◽  
Computer Aided ◽  
Aided Design ◽  
Cascaded Structures ◽  
The Impact

Effect of In-office Bleaching on Color, Translucency, and Whiteness Variations in CAD-CAM Monolithic Materials

2021 ◽  
Author(s):  
RG Fonseca ◽  
RC Peńa ◽  
R Simóes ◽  
AC Ramos ◽  
LN Dovigo
Keyword(s):  
Optical Properties ◽  
Computer Aided Design ◽  
Calculated Data ◽  
Color Difference ◽  
Deionized Water ◽  
Stain Removal ◽  
Computer Aided ◽  
Cad Cam ◽  
Aided Design ◽  
The Impact

SUMMARY Little is known about the impact of bleaching on the optical properties of computer-aided design and computer-aided manufactured (CAD-CAM) monolithic materials. The aim of the present study was to evaluate the effect of one session of in-office bleaching on stain removal, staining susceptibility, translucency, and whiteness variations of CADCAM monolithic materials. Disks were fabricated from Lava Ultimate (LU), Vita Enamic (VE), Vita Suprinity (VS), and IPS e.max CAD (IPS). A spectrophotometer was used to register Commission Internationale de l’Eclairage L*a*b* coordinates. For stain removal, 80 specimens from each material were assessed at baseline (R0) and after immersion in deionized water or coffee for 365 days followed or not by bleaching with 40% hydrogen peroxide (R1). For staining susceptibility, 80 specimens from each material were analyzed at baseline (R0’), and after having been bleached or not and immersed in deionized water or coffee (R1’). Both analyses were calculated as the color difference (ΔE00) between R1-R0 and R1’-R0’, respectively. Differences in translucency (ΔTP00) and whiteness (ΔWID) between R1-R0 and R1’-R0’ were also calculated. Data were analyzed by three-way ANOVA and the Games-Howell post hoc test (α=0.05). Clinical significance was based on 50%:50% perceptibility and acceptability thresholds for ΔE00, ΔTP00 and ΔWID, respectively. Surfaces were analyzed by scanning electron microscopy. Coffee increased ΔE00 in LU, VE, and VS, and decreased their translucency and whiteness, whereas the IPS had only its whiteness affected. Bleaching after immersion in coffee decreased ΔE00 in LU and VE, and increased translucency and whiteness of LU, VE, and VS. No effect was observed on IPS. Bleaching before immersion in coffee decreased translucency of LU, but within the acceptable interval, while VE exhibited lower ΔE00, and became more translucent and less dark. Both VS and IPS were not affected. One session of in-office bleaching benefited optical properties of the previously stained LU, VE, and VS, without increasing their susceptibility to staining or adversely providing clinically unacceptable variations in their translucency and whiteness. All variations exhibited by the IPS were below the perceptible threshold.

scholarly journals Application Solid Laser-Sintered or Machined Ti6Al4V Alloy in Manufacturing of Dental Implants and Dental Prosthetic Restorations According to Dentistry 4.0 Concept

Processes ◽  
2020 ◽  
Vol 8 (6) ◽  
pp. 664 ◽  
Author(s):  
Leszek A. Dobrzański ◽  
Lech B. Dobrzański ◽  
Anna Achtelik-Franczak ◽  
Joanna Dobrzańska
Keyword(s):  
Dental Implants ◽  
Computer Aided Design ◽  
Bending Strength ◽  
Ti6al4v Alloy ◽  
Cnc Machining ◽  
Live Cells ◽  
Computer Aided ◽  
Aided Design ◽  
The Impact

This paper presents a comparison of the impact of milling technology in the computer numerically controlled (CNC) machining centre and selective laser sintering (SLS) and on the structure and properties of solid Ti6Al4V alloy. It has been shown that even small changes in technological conditions in the SLS manufacturing variant significantly affect changes from two to nearly two and a half times in tensile and bending strengths. Both the tensile and bending strength obtained in the most favourable manufacturing variant by the SLS method is over 25% higher than in the case of cast materials subsequently processed by milling. Plug-and-play SLS conditions provide about 60% of the possibilities. Structural, tribological and electrochemical tests were carried out. In vitro biological tests using osteoblasts confirm the good tendency for the proliferation of live cells on the substrate manufactured under the most favourable SLS conditions. The use of SLS additive technology for the manufacturing of dental implants and abutments made of Ti6Al4V alloy in combination with the digitisation of dental diagnostics and computer-aided design and manufacture of computer-aided design/manufacturing (CAD/CAM) following the idea of Dentistry 4.0 is the best choice of technology for manufacturing of prosthetic and implant devices used in dentistry.

Organizational Effectiveness of Computer-Aided Design

1987 ◽  
Vol 31 (2) ◽  
pp. 214-217
Author(s):  
Douglas H. Harris ◽  
Steven M. Casey
Keyword(s):  
Organizational Effectiveness ◽  
Computer Aided Design ◽  
Working Environment ◽  
Specific System ◽  
Cad System ◽  
Organizational Issues ◽  
Computer Aided ◽  
Major Factors ◽  
Aided Design ◽  
The Impact

A methodology for measuring the organizational effectiveness of computer-aided design (CAD) was developed and applied. A total of 295 of the 500 most frequent users of CAD in a major aerospace company provided data for the study. User-CAD effectiveness was found to be influenced by 43 major factors and 145 specific system and organizational issues. The 43 factors were classified into the following categories: system functions, system hardware, working environment, system reliability and consistency, user access, user support and training, and system administration. Indexes of User-CAD Effectiveness (UE) and System Availability and Reliability (AR) were combined into an Index of CAD Organizational Effectiveness (OE). Through the application of these methods and indexes, CAD system and organizational deficiencies can be diagnosed, potential high-payoff improvements can be identified, and the impact of developmental efforts can be assessed.

Computer-aided design versus sketching: An exploratory case study

2012 ◽  
Vol 26 (3) ◽  
pp. 317-335 ◽  
Author(s):  
David Veisz ◽  
Essam Z. Namouz ◽  
Shraddha Joshi ◽  
Joshua D Summers
Keyword(s):  
Design Process ◽  
Computer Aided Design ◽  
Mechanical Engineering ◽  
Computer Assisted ◽  
Cad Tools ◽  
Design Project ◽  
Computer Aided ◽  
Aided Design ◽  
The Impact

AbstractThis paper presents a preliminary comparison between the role of computer-aided design (CAD) and sketching in engineering through a case study of a senior design project and interviews with industry and academia. The design team consisted of four senior level mechanical engineering students each with less than 1 year of professional experience are observed while completing an industry sponsored mechanical engineering capstone design project across a 17 week semester. Factors investigated include what CAD tools are used, when in the design process they are implemented, the justification for their use from the students' perspectives, the actual knowledge gained from their use, the impact on the final designed artifact, and the contributions of any sketches generated. At each design step, comparisons are made between CAD and sketching. The students implemented CAD tools at the onset of the project, generally failing to realize gains in design efficiency or effectiveness in the early conceptual phases of the design process. As the design became more concrete, the team was able to recognize clear gains in both efficiency and effectiveness through the use of computer assisted design programs. This study is augmented by interviews with novice and experienced industry users and academic instructors to align the trends observed in the case study with industry practice and educational emphasis. A disconnect in the perceived capability of CAD tools was found between novice and experienced user groups. Opinions on the importance of sketching skills differed between novice educators and novice industry professionals, suggesting that there is a change of opinion as to the importance of sketching formed when recent graduates transition from academia to industry. The results suggest that there is a need to emphasize the importance of sketching and a deeper understanding as to the true utility of CAD tools at each stage of the design process.

Impact of Pulse Quenching Effect on Sensitive Area at Advanced Technologies

2013 ◽  
Vol 392 ◽  
pp. 693-696
Author(s):  
Wen Tao Xu ◽  
Yang Guo ◽  
Yan Kang Du
Keyword(s):  
Computer Aided Design ◽  
Three Dimensional ◽  
Sensitive Area ◽  
Isolation Technique ◽  
Quenching Effect ◽  
Advanced Technologies ◽  
Computer Aided ◽  
Simulation Results ◽  
Aided Design ◽  
The Impact

The impact of pulse quenching effect on the sensitive area is evaluated by using three-dimensional technology computer-aided design (TCAD) numerical simulation. Simulation results present that the pulse quenching effect could effectively reduce the sensitive area of PMOS transistors. By adopting the off-state gate isolation technique, the sensitive area is further reduced.

scholarly journals Exploring the Impact of Peer-Generated Screencast Tutorials on Computer-Aided Design Education

2015 ◽  
Author(s):  
Dongdong Zhang ◽  
Xiaobo Peng ◽  
Bugrahan Yalvac ◽  
Deniz Eseryel ◽  
Uzair Nadeem ◽  
...  
Keyword(s):  
Computer Aided Design ◽  
Design Education ◽  
Computer Aided ◽  
Aided Design ◽  
The Impact

Collaborative project: Evolution of computer-aided design data completeness as management information

2017 ◽  
Vol 25 (3) ◽  
pp. 212-228 ◽  
Author(s):  
Damien Fleche ◽  
Jean-Bernard Bluntzer ◽  
Ahmad Al Khatib ◽  
Morad Mahdjoub ◽  
Jean-Claude Sagot
Keyword(s):  
Product Design ◽  
Design Process ◽  
Collaborative Design ◽  
Computer Aided Design ◽  
Design Model ◽  
Design Project ◽  
Computer Aided ◽  
Product Design Process ◽  
Aided Design ◽  
The Impact

Today, product design process is facing a market globalisation led by distributed teams. The international market context, in which industrial companies evolve, leads design teams to work in a large multidisciplinary collaborative context using collaborative practices. In this context, product design process is driven by the integration and optimisation of stakeholders’ collaboration. Thus, to facilitate collaborative steps, new management strategies are defined and new information systems can be used. To this end, we have focused our article on the topic of collaborative product design project management. We have underlined the necessity to use quantitative and non-intrusive indicators during the management of collaborative design phases besides subjective evaluations. Tracking these indicators is performed in parallel to the existing approaches in order to evaluate the performance of collaborative design project. Moreover, these indicators can show the impact of the collaboration steps on the design project evolution. The computation of proposed indicators is based on precise metrics which details the completeness of the computer-aided design model and its evolution depending on the used collaborative tools and the project milestones. This computation uses the importance of each computer-aided design model part and the transformation rate of each part of the computer-aided design model.

scholarly journals A graph-theoretic implementation of the Rabo-de-Bacalhau transformation grammar

2016 ◽  
Vol 30 (2) ◽  
pp. 138-158 ◽  
Author(s):  
Tiemen Strobbe ◽  
Sara Eloy ◽  
Pieter Pauwels ◽  
Ruben Verstraeten ◽  
Ronald De Meyer ◽  
...  
Keyword(s):  
Computer System ◽  
Computer Aided Design ◽  
Research Question ◽  
Shape Grammar ◽  
Design Practice ◽  
Shape Grammars ◽  
Graph Theoretic ◽  
Computer Aided ◽  
Aided Design ◽  
The Impact

AbstractShape grammars are rule-based formalisms for the specification of shape languages. Most of the existing shape grammars are developed on paper and have not been implemented computationally thus far. Nevertheless, the computer implementation of shape grammar is an important research question, not only to automate design analysis and generation, but also to extend the impact of shape grammars toward design practice and computer-aided design tools. In this paper, we investigate the implementation of shape grammars on a computer system, using a graph-theoretic representation. In particular, we describe and evaluate the implementation of the existing Rabo-de-Bacalhau transformation grammar. A practical step-by-step approach is presented, together with a discussion of important findings noticed during the implementation and evaluation. The proposed approach is shown to be both feasible and valuable in several aspects: we show how the attempt to implement a grammar on a computer system leads to a deeper understanding of that grammar, and might result in the further development of the grammar; we show how the proposed approach is embedded within a commercial computer-aided design environment to make the shape grammar formalism more accessible to students and practitioners, thereby increasing the impact of grammars on design practice; and the proposed step-by-step implementation approach has shown to be feasible for the implementation of the Rabo-de-Bacalhau transformation grammar, but can also be generalized using different ontologies for the implementation.

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