• Title/Summary/Keyword: commercial CAD

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Retrieval of CAD Model Information Using Web Services (웹 서비스를 이용한 CAD 모델 정보의 획득)

  • Kim, Byung-Chul;Han, Soon-Hung
    • Korean Journal of Computational Design and Engineering
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    • v.12 no.4
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    • pp.233-244
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    • 2007
  • Web Services are a distributed component technology based on XML and Web. The Web Services are used to integrate heterogeneous systems under the distributed environment. In this study, the concept of Web Services for CAD (WSC) is introduced, which aims at interoperation with CAD systems using the Web Services. This paper introduces one part of the WSC which enables remote users or applications to retrieve the geometries and the design history of CAD models using the Web Services. This paper proposes an architecture of the WSC, the data model and the interfaces for retrieving CAD model information, and the way to apply the WSC to commercial CAD systems.

Healing of CAD Model Errors Using Design History (설계이력 정보를 이용한 CAD모델의 오류 수정)

  • Yang J. S.;Han S. H.
    • Korean Journal of Computational Design and Engineering
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    • v.10 no.4
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    • pp.262-273
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    • 2005
  • For CAD data users, few things are as frustrating as receiving CAD data that is unusable due to poor data quality. Users waste time trying to get better data, fixing the data, or even rebuilding the data from scratch from paper drawings or other sources. Most related works and commercial tools handle the boundary representation (B-Rep) shape of CAD models. However, we propose a design history?based approach for healing CAD model errors. Because the design history, which covers the features, the history tree, the parameterization data and constraints, reflects the design intent, CAD model errors can be healed by an interdependency analysis of the feature commands or of the parametric data of each feature command, and by the reconstruction of these feature commands through the rule-based reasoning of an expert system. Unlike other B Rep correction methods, our method automatically heals parametric feature models without translating them to a B-Rep shape, and it also preserves engineering information.

Positive Predictive Values of Abnormality Scores From a Commercial Artificial Intelligence-Based Computer-Aided Diagnosis for Mammography

  • Si Eun Lee;Hanpyo Hong;Eun-Kyung Kim
    • Korean Journal of Radiology
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    • v.25 no.4
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    • pp.343-350
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    • 2024
  • Objective: Artificial intelligence-based computer-aided diagnosis (AI-CAD) is increasingly used in mammography. While the continuous scores of AI-CAD have been related to malignancy risk, the understanding of how to interpret and apply these scores remains limited. We investigated the positive predictive values (PPVs) of the abnormality scores generated by a deep learning-based commercial AI-CAD system and analyzed them in relation to clinical and radiological findings. Materials and Methods: From March 2020 to May 2022, 656 breasts from 599 women (mean age 52.6 ± 11.5 years, including 0.6% [4/599] high-risk women) who underwent mammography and received positive AI-CAD results (Lunit Insight MMG, abnormality score ≥ 10) were retrospectively included in this study. Univariable and multivariable analyses were performed to evaluate the associations between the AI-CAD abnormality scores and clinical and radiological factors. The breasts were subdivided according to the abnormality scores into groups 1 (10-49), 2 (50-69), 3 (70-89), and 4 (90-100) using the optimal binning method. The PPVs were calculated for all breasts and subgroups. Results: Diagnostic indications and positive imaging findings by radiologists were associated with higher abnormality scores in the multivariable regression analysis. The overall PPV of AI-CAD was 32.5% (213/656) for all breasts, including 213 breast cancers, 129 breasts with benign biopsy results, and 314 breasts with benign outcomes in the follow-up or diagnostic studies. In the screening mammography subgroup, the PPVs were 18.6% (58/312) overall and 5.1% (12/235), 29.0% (9/31), 57.9% (11/19), and 96.3% (26/27) for score groups 1, 2, 3, and 4, respectively. The PPVs were significantly higher in women with diagnostic indications (45.1% [155/344]), palpability (51.9% [149/287]), fatty breasts (61.2% [60/98]), and certain imaging findings (masses with or without calcifications and distortion). Conclusion: PPV increased with increasing AI-CAD abnormality scores. The PPVs of AI-CAD satisfied the acceptable PPV range according to Breast Imaging-Reporting and Data System for screening mammography and were higher for diagnostic mammography.

A study on Applicability of VacCAD Simulator

  • Kim, Hyung-Taek;Kim, Kang-Won
    • International journal of advanced smart convergence
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    • v.8 no.4
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    • pp.200-206
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    • 2019
  • In this study, we compared the VacCAD and VacSim(Multi), commercial vacuum simulators, to verify the advantages of VacCAD's efficiency. It was emphasized on immediacy and simplicity of simulation modelling, and characteristics of the pump combinations, pumping down curves, and vacuum materials. First, usability of simulation mechanism was estimated through the modeling schematics and obtained simulation results of each employed simulator were compared to evaluate the applicability in practice. Simulation reliability of each simulator was also probed by comparing the pumping characteristics of commercially available high vacuum systems. In addition, the degree of tolerances on VacCAD was also investigated through pumping down analysis considering outgassing effect due to chamber material variations. The higher effectiveness and expediency of VacCAD than VacSim(Multi) has been presented, and it was expected that the utilization of VacCAD in vacuum applications to be increased.

The Exchange of Feature Data Among CAD Systems Using XML (CAD 시스템간의 형상정보 교환을 위한 XML 이용에 관한 연구)

  • 박승현;최의성;정태형
    • Transactions of the Korean Society of Machine Tool Engineers
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    • v.13 no.3
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    • pp.30-36
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    • 2004
  • The exchange of model design data among heterogeneous CAD systems is very difficult because each CAD system has different data structures suitable for its own functions. STEP represents product information in a common computer-interpretable form that is required to remain complete and consistent when the product information is needed to be exchanged among different computer systems. However, STEP has complex architecture to represent point, line, curve and vectors of element. Moreover it can't represent geometry data of feature based models. In this study, a structure of XML document that represents geometry data of feature based models as neutral format has been developed. To use the developed XML document, a converter also has been developed to exchange modules so that it can exchange feature based data models among heterogeneous CAD systems. Developed XML document and Converter have been applied to commercial CAD systems.

Optimization of Machine Tool Structure using a CAD-based Optimal Design System (CAD 기반 최적설계 시스템을 활용한 공작기계 구조의 최적화)

  • Shin, Jeong-Ho;Kwak, Byung-Man
    • Proceedings of the KSME Conference
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    • 2001.06a
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    • pp.926-931
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    • 2001
  • In this paper a CAD-based optimal design system is introduced and applied to optimal design of machine tool structures. The system is designed to reduce manual interfacing effort. All the design activities such as selecting design variables, making FE meshes and FE analysis are integrated on a parametric CAD program. A user can easily select design variables by clicking a CAD model. To enhance the robustness and versatility, this system uses the finite difference method for the design sensitivity analysis. By taking a practical example of the design of the column of a horizontal machining center, it is shown that the software system is efficiently usable in industry establishing the goal of minimizing user intervention between various analysis and optimization activities.

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Design Technique of SR Machine for Hydraulic Pump System using Combined CAD and Genetic Algorithm (유전자 알고리즘과 상용 설계도구를 이용한 유압 펌프 시스템용 SRM 설계기법)

  • Ahn, Jin-Woo;Lee, Dong-Hee;Kim, Tae-Hyoung
    • The Transactions of the Korean Institute of Electrical Engineers B
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    • v.55 no.7
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    • pp.369-373
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    • 2006
  • In this paper, an optimal method for determining design parameters of a Switched Reluctance Motor is researched. The dominant design parameters are stator and rotor pole arc and switching on and off angle. The parameters affecting performance are examined and selected using evolutionary computations and commercial CAD program. The simulated design method is compared with conventional procedure.

Simulation of Losses in Waveguide Filter using A Commercial CAD Software (상용 CAD프로그램을 이용한 도파관 필터의 손실계산)

  • 이종경;이석곤;안병철
    • Proceedings of the Korea Electromagnetic Engineering Society Conference
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    • 2001.11a
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    • pp.169-171
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    • 2001
  • 본 논문에서는 유한요소법에 기초한 상용프로그램을 이용하여 도파관 필터를 시뮬레이션을 할 경우 도체에 의한 손실을 포함시키는 방법을 제시하였다. 우선 균일한 도파관의 도체에 의한 감쇠의 시뮬레이션 결과를 이론치와 비교하였다. 다음으로 도파관 대역통과 필터의 통과대역 감쇠의 측정결과와 시뮬레이션의 결과를 비교하여 시뮬레이션의 정확도를 검증하였다.

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A study on 3D CAD tolerance information handling for inspection plnning (CAPP를 위한 3차원 CAD에서의 공차정보관리에 관한 연구)

  • 황인식;이관복;하성도
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 1995.10a
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    • pp.952-956
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    • 1995
  • It is known that the 3D Solid CAD system can provide various information which is useful for implementing CAPP and CAE. However the commercial 3D CAD systems available today do not support the handling of non-geometric information such as geometry tolerance and surface finish. It is impossible to input the non-geometric information during designof parts while CAPP needs the information for selecting machine tools. fiztures, inspection method, etc. In this paper the need of research on handling tolerance information In 3D CAD systems is considered. The development of inspection planning support system is also explained with an example. The development of inspection planning support systm receives the design geometry information from the 3D CAD system in the form of 2D draft and generates the inspection data base and the inspection sheet through the user interaction.

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Why are 3D Apparel CADs Not Used?

  • Kim, Sung K.;Im, Nam Y.
    • Journal of Information Technology Applications and Management
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    • v.20 no.3
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    • pp.93-104
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    • 2013
  • A 3D CAD is one of latest innovations in apparel industry. Despite a rapid progress of related technologies and an emergence of several commercial products in markets, an adoption of 3D CAD tools in apparel industry is much slower than originally expected. In an effort to diffuse such a technological advance in apparel industry, more behavioral studies of why and how apparel designers adopt and use a 3D CAD are needed. Toward that goal, this study aims to identify more about whether such an adoption decision would be more associated with organizations or individuals. Using TAM and TOE framework, the study findings show that the intention to adopt 3D garment CAD is more explained by individual attitudes rather than organizational characteristics.