• 제목/요약/키워드: computer aided simulation

검색결과 347건 처리시간 0.03초

객체지향형 제어 시스템 디자인 패키지의 개발 (Development of object oriented computer aided control systems design package)

  • 양광웅;박재현
    • 제어로봇시스템학회:학술대회논문집
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    • 제어로봇시스템학회 1996년도 한국자동제어학술회의논문집(국내학술편); 포항공과대학교, 포항; 24-26 Oct. 1996
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    • pp.441-444
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    • 1996
  • Object-oriented programming goes on increasing in many areas, as its advantages of flexibility and ease of maintenance have been recognized. As in usual programmings, the productivity and flexibility of CACSD package can be improved by adopting object-oriented programmin. This paper describes our efforts to implement an OO-CACSD(Object Oriented CACSD) package for control system design and simulation. Since the proposed OO-CACSD is based on the modularity, portability, reuseability, and matrix-oriented data structure, a control system can be not only modeled and simulated but also maintained easily.

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Genioplasty using a simple CAD/CAM (computer-aided design and computer-aided manufacturing) surgical guide

  • Lim, Se-Ho;Kim, Moon-Key;Kang, Sang-Hoon
    • Maxillofacial Plastic and Reconstructive Surgery
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    • 제37권
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    • pp.44.1-44.6
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    • 2015
  • Background: The present study introduces the design and fabrication of a simple surgical guide with which to perform genioplasty. Methods: A three-dimensional reconstruction of the patient's cranio-maxilla region was built, with a dentofacial skeletal model, then derived from CT DICOM data. A surgical simulation was performed on the maxilla and mandible, using three-dimensional cephalometry. We then simulated a full genioplasty, in silico, using the three-dimensional (3D) model of the mandible, according to the final surgical treatment plan. The simulation allowed us to design a surgical guide for genioplasty, which was then computer-rendered and 3D-printed. The manufactured surgical device was ultimately used in an actual genioplasty to guide the osteotomy and to move the cut bone segment to the intended location. Results: We successfully performed the osteotomy, as planned during a genioplasty, using the computer-aided design and computer-aided manufacturing (CAD/CAM) surgical guide that we initially designed and tested using simulated surgery. Conclusions: The surgical guide that we developed proved to be a simple and practical tool with which to assist the surgeon in accurately cutting and removing bone segments, during a genioplasty surgery, as preoperatively planned during 3D surgical simulations.

SPICE를 사용한 3D NAND Flash Memory의 Channel Potential 검증 (The Verification of Channel Potential using SPICE in 3D NAND Flash Memory)

  • 김현주;강명곤
    • 전기전자학회논문지
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    • 제25권4호
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    • pp.778-781
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    • 2021
  • 본 논문에서는 SPICE를 사용한 16단 3D NAND Flash memory compact modeling을 제안한다. 동일한 structure와 simulation 조건에서 Down Coupling Phenomenon(DCP)과 Natural Local Self Boosting(NLSB)에 대한 channel potential을 Technology Computer Aided Design(TCAD) tool Atlas(SilvacoTM)와 SPICE로 simulation하고 분석했다. 그 결과 두 현상에 대한 TCAD와 SPICE의 channel potential이 매우 유사한 것을 확인할 수 있었다. SPICE는 netlist를 통해 소자 structure를 직관적으로 확인할 수 있다. 또한, simulation 시간이 TCAD에 비해 짧게 소요된다. 그러므로 SPICE를 이용하여 3D NAND Flash memory의 효율적인 연구를 기대할 수 있다.

Single-tooth dento-osseous osteotomy with a computer-aided design/computer-aided manufacturing surgical guide

  • Kang, Sang-Hoon;Kim, Moon-Key;Lee, Ji-Yeon
    • Journal of the Korean Association of Oral and Maxillofacial Surgeons
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    • 제42권2호
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    • pp.127-130
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    • 2016
  • This clinical note introduces a method to assist surgeons in performing single-tooth dento-osseous osteotomy. For use in this method, a surgical guide was manufactured using computer-aided design/computer-aided manufacturing technology and was based on preoperative surgical simulation data. This method was highly conducive to successful single-tooth dento-osseous segmental osteotomy.

열팽창성 그래파이트 함량에 따른 고탄성 도료 소재의 특성 분석 및 비선형 재료모델을 활용한 물성 예측 시뮬레이션 연구 (Characteristics Analysis of Highly Elastic Materials according to the Graphite Content and a Simulation Study of Physical Properties Prediction Using a Nonlinear Material Model)

  • 유성훈;이종혁;김대철;이병수;심지현
    • 한국염색가공학회지
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    • 제34권4호
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    • pp.250-260
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    • 2022
  • In this research, a high-elasticity acrylic emulsion binder with core-shell polymerization and self-crosslinking system is mixed with a flame-retardant water-dispersed polyurethane (PUD) binder. In addition, finite element analysis was conducted through virtual engineering software ANSYS by applying three representative nonlinear material models. The most suitable nonlinear material model was selected after the relative comparison between the actual experimental values and the predicted values of the properties derived from simulations. The selected nonlinear material model is intended to be used as a nonlinear material model for computational simulation analysis that simulates the experimental environment of the vibration test (ASTM E1399) and the actual fire safety test (ASTM E1966). When the mass fraction of thermally expandable graphite was 0.7%, the thermal and physical properties were the best. Among the nonlinear material models, the simulation result of the Ogden model showed the closest value to the actual result.

컴퓨터에 의해 수행되어지는 시뮬레이션 모델링을 위한 지식베이스 접근방법 (Knowledge-Based Approach for Computer-Aided Simulation Modeling)

  • 이영해;김남영
    • 산업공학
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    • 제2권2호
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    • pp.51-62
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    • 1989
  • A computer-aided simulation modeling system has been developed to allow the automatic construction of complete discrete simulation models for queueing systems. Three types of knowledge are used in the specification and construction of a simulation modeling: Knowledge of queueing system, simulation modeling, and a target simulation language. This knowledge has been incorporated into the underlying rule base in the form of extraction and construction rule, and implemented via the expert system building tool, OPS5. This paper suggested a knowledge based approach for automatic programming to enable a user who lacks modeling knowledge and simulation language expertize to quickly build executable models.

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ABS/PC/POE 열가소성 복합재료의 특성평가 및 시뮬레이션을 통한 물리적 성능 예측 연구 (Characterization of ABS/PC/POE Thermoplastic Composites and Prediction of Mechanical Properties by Geometry Simulation)

  • 유성훈;이종혁;여동현;신용호;박종수;심지현
    • 한국염색가공학회지
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    • 제34권2호
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    • pp.117-126
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    • 2022
  • In this study, thermoplastic composites were manufactured using ABS(acrylonitrile butadiene styrene), PC(polycarbonate), and POE(polyolefin elastomer), which are thermoplastic plastics. Twin screw extruder and injection molding were used to manufacture thermoplastic composites. When the ABS/PC/POE thermoplastic composite material was manufactured, the POE mass fraction was set to 1 to 5 wt.%, and the thermal and mechanical properties according to the POE mass fraction were analyzed. Based on the physical properties of ABS/PC/POE, a 3D model in the form of an e-bike frame was created. After setting the boundary conditions, when an external load is applied, geometry simulation was performed to predict product performance. The ABS/PC/POE thermoplastic composite material exhibited the best physical properties when the mass fraction of POE was 3 wt.%. In the simulation results for the physical properties of the 3D model in the form of an e-bike frame, the best physical properties were shown when the mass fraction of POE was 2 ~ 3 wt.%. As a result, the manufacturing conditions for ABS/PC/POE thermoplastic composite materials were set, and research was conducted to reduce product development costs and development time.

CAW(Computer-Aided Weaving) 시스템을 활용한 Supplementary Warp의 직조디자인 연구 (A Study on Weave Design of Supplementary Warp using Computer-Aided Weaving System)

  • 송하영
    • 한국의상디자인학회지
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    • 제12권3호
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    • pp.43-55
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    • 2010
  • The major advantages to use CAD System are that it reduce time and effort to manufacture products, and also can demonstrate the condition of the final product prior to the actual manufacturing process of the selected design using the simulation programs in CAD system. Specially in weave design, for use as Computer-Aided Weaving system, the complicated Dobby weave can figured out easily through calculating the complex weave plans of multi shafts. As to one of dobby weave structures, Supplementary warp is the warp threads which are in addition to the regular warps of the woven fabrics, and used for decorating the band or expressing some patterns. The purpose of this study is to research the weave design of Supplementary warp using Computer-Aided Weaving system, which is dobby weave design program of Weave Point. For performing this design study, it was researched the classified woven fabrics depending upon weaving processing, Computer-Aided Weaving system, and the characteristic of Supplementary warp fabrics. On the basis of the theoretical research, Supplementary warp was worked for the 24-shafts AVL computer dobby loom that applied to the various patterned images. The design work was done by Weave Point program of dobby weave, and simulated to fabrics before woven into the computer dobby loom. To see the visual images of fashion items, these simulated bobby fabrics were processed by three-dimension modeling through YoungWoo CNI CAD system. All the patterns of the Supplementary warp in this study could be applied for decorating the fashion clothing and accessories.

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곡선 캠을 이용한 자동 이송장치의 기구 해석 및 Simulation용 Graphic-Oriented CAD 개발 2 (Graphics-Oriented CAD Developmen of Kinematic Analysis And Simwlation of An Automatic Feeding System By A Curvilinear Cam. Part II : Graphics-Oriented CAD Development)

  • 신중호;류갑상;김상진
    • 제어로봇시스템학회:학술대회논문집
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    • 제어로봇시스템학회 1987년도 한국자동제어학술회의논문집; 한국과학기술대학, 충남; 16-17 Oct. 1987
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    • pp.269-272
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    • 1987
  • This paper is concerned on kinematic analysis and simulation of an automatic feeding mechanism subjected by the motion of a curvilinear inverse cam. The main objection is the development of computer-aided design (CAD) program for simulating the motion of the cam-feeding mechanism using computer-graphics. A computer program CACAFS (Computer-Aided Cam and Automatic Feeding System) is independent of computer hardware used. The program is also interactive using a menu-selection technique. As the second part of the paper for the motion simulation of the cam-feeding system, this paper discusses the state-of-art for CAD. The first part of the paper presents the algorithm to simulate the notion of the cam-feeding mechanism.

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Biomechanical behavior of CAD/CAM cobalt-chromium and zirconia full-arch fixed prostheses

  • Barbin, Thais;Silva, Leticia Del Rio;Veloso, Daniele Valente;Borges, Guilherme Almeida;Presotto, Anna Gabriella Camacho;Barao, Valentim Adelino Ricardo;Groppo, Francisco Carlos;Mesquita, Marcelo Ferraz
    • The Journal of Advanced Prosthodontics
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    • 제12권6호
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    • pp.329-337
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    • 2020
  • PURPOSE. To verify the influence of computer-aided design/computer-aided manufacturing (CAD/CAM) implant-supported prostheses manufactured with cobalt-chromium (Co-Cr) and zirconia (Zr), and whether ceramic application, spark erosion, and simulation of masticatory cycles modify biomechanical parameters (marginal fit, screw-loosening torque, and strain) on the implant-supported system. MATERIALS AND METHODS. Ten full-arch fixed frameworks were manufactured by a CAD/CAM milling system with Co-Cr and Zr (n=5/group). The marginal fit between the abutment and frameworks was measured as stated by single-screw test. Screw-loosening torque evaluated screw stability, and strain analysis was explored on the implant-supported system. All analyses were performed at 3 distinct times: after framework manufacturing; after ceramic application in both materials' frameworks; and after the spark erosion in Co-Cr frameworks. Afterward, stability analysis was re-evaluated after 106 mechanical cycles (2 Hz/150-N) for both materials. Statistical analyses were performed by Kruskal-Wallis and Dunn tests (α=.05). RESULTS. No difference between the two materials was found for marginal fit, screwloosening torque, and strain after framework manufacturing (P>.05). Ceramic application did not affect the variables (P>.05). Spark erosion optimized marginal fit and strain medians for Co-Cr frameworks (P<.05). Screw-loosening torque was significantly reduced by masticatory simulation (P<.05) regardless of the framework materials. CONCLUSION. Co-Cr and Zr frameworks presented similar biomechanical behavior. Ceramic application had no effect on the biomechanical behavior of either material. Spark erosion was an effective technique to improve Co-Cr biomechanical behavior on the implant-supported system. Screw-loosening torque was reduced for both materials after masticatory simulation.