• Title/Summary/Keyword: Computer Aided Engineering

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Development of Computer-Aided Surgery System for High Tibial Osteotomy Using Tracking-Pin and Fluoroscopic G-arm Images (Tracking-Pin과 Fluoroscopic G-arm 이미지를 이용한 경골근위부절골술 지원시스템 개발)

  • Koo, Bon-Yeol;Kim, Cheol-Woong;Lee, Sun-Hyuk;Bae, Ji-Hoon;Park, Cheol-Woo;Kim, Jay-Jung
    • Korean Journal of Computational Design and Engineering
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    • v.16 no.5
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    • pp.331-343
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    • 2011
  • High tibial osteotomy (HTO) is a widely accepted treatment for unicompartmental osteoarthritis of the knee and other lower extremity deformities, particularly for young and active patients. However, it is generally recognized as a technically demanding procedure. Thus the limitations of conventional surgical methods have been reported. Currently, the use of computer-aided surgery (CAS) system for successful surgery was increased. However it has been reported many problems such as expensive equipment, infection or fracture caused by inserting half-pin and delaying surgery. Therefore we propose a novel method which can be tracked by using tracking-pin inserted in arbitrary locations of the femur and tibia, and fluoroscopic images obtained from G-arm of antero-posterior and lateral-medial.

Analysis of Inverse Heat Conduction Problem Using OpenFOAM and VisualDoc (OpenFOAM 과 VisualDoc 을 이용한 역열전도 문제의 해석)

  • Kim, Sung-Won;Kim, Sun Kyoung
    • Transactions of the Korean Society of Mechanical Engineers B
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    • v.37 no.6
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    • pp.539-544
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    • 2013
  • This study provides a solution method for the inverse heat conduction problem based on a combination of a public domain CAE (computer aided engineering) software and a commercial CAO (computer aided optimization) software. The solver system has been implemented without any in-house coding. The proposed method is simple to implement. Moreover, it can be easily reproduced.

Development of Dental Scanning Machine (치과용 Scanning 머신 개발)

  • 차영엽;동진근;오상천;이해형;송기창
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2002.10a
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    • pp.562-565
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    • 2002
  • Recent technologic innovations have created possibilities for restorative dentistry, such as computer-aided design and computer-aided manufacturing. This article presents a CAD process that has been developed for the fabrication of dental restorations. This process uses a 4-axes driving mechanism and an improved optical displacement sensor, successfully applied in other industries. In optical displacement sensor, the light beam emitted from the LED is converged through the light source lenses and thrown on the object to be detected. When the light beam is reflected from the object, however, it is diffused. The diffused light beam is converged again by the receiver lenses and cast on the optical position detector element as a small spot.

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Computer aided reinforcement design of RC structures

  • An, Xuehui;Maekawa, Koichi
    • Computers and Concrete
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    • v.1 no.1
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    • pp.15-30
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    • 2004
  • In this study, a design process for reinforced concrete structures using the nonlinear FEM analysis is developed. Instead of using the nonlinear analysis to evaluate the required performance after design process, the nonlinear analysis is applied before designing the reinforcement arrangement inside the RC structures. An automatic reinforcement generator for computer aided reinforcement agreement is developed for this purpose. Based on a nonlinear FEM program for analyzing the reinforced concrete structure, a smart fictitious material model of steel, is proposed which can self-adjust the reinforcement to the required amount at the cracking location according to the load increment. Using this tool, the reinforcement ratio required at design load level can be decided automatically. In this paper, an example of RC beam with opening is used to verify the proposed process. Finally, a trial design process for a real size underground RC LNG tank is introduced.

Computer aided design system for robotic painting line (동장공정의 로보틱자동화를 위한 설계지원 시스템)

  • Suh, Suk-Hwan;Cho, Jung-Hoon;Kang, Dae-Ho
    • Journal of the Korean Society for Precision Engineering
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    • v.11 no.5
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    • pp.171-179
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    • 1994
  • For successful implementation of robotic painting system, a structured design and analysis procedure is necessary. In designing robotic system, both functional and economical feasibility should be investigated. As the robotization is complicated task involving implemen- tation details (such as robot selection, accessory design, and spatial layout) together with operation details, the computer aided design and analysis method should be sought. However, conventional robotic design systems and off-line programming systems cannot accommodate these inquiries in a unified fashion. In this research, we develop an interactive design support system for robotization of a cycle painting line. With the developed system called SPRPL (Simulation Package for Robotic Painting Line) users can design the painting objects (via FRAME module), select robot model (ROBOT), design the part hanger (FEEDER), and arrange the workcell. After motion programming (MOTION), the design is evaluated in terms of: a) workpace analysis, b) coating thickness analysis, and c) cycle time (ANALYSIS).

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A Study on Jaundice Computer-aided Diagnosis Algorithm using Scleral Color based Machine Learning

  • Jeong, Jin-Gyo;Lee, Myung-Suk
    • Journal of the Korea Society of Computer and Information
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    • v.23 no.12
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    • pp.131-136
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    • 2018
  • This paper proposes a computer-aided diagnostic algorithm in a non-invasive way. Currently, clinical diagnosis of jaundice is performed through blood sampling. Unlike the old methods, the non-invasive method will enable parents to measure newborns' jaundice by only using their mobile phones. The proposed algorithm enables high accuracy and quick diagnosis through machine learning. In here, we used the SVM model of machine learning that learned the feature extracted through image preprocessing and we used the international jaundice research data as the test data set. As a result of applying our developed algorithm, it took about 5 seconds to diagnose jaundice and it showed a 93.4% prediction accuracy. The software is real-time diagnosed and it minimizes the infant's pain by non-invasive method and parents can easily and temporarily diagnose newborns' jaundice. In the future, we aim to use the jaundice photograph of the newborn babies' data as our test data set for more accurate results.

Direct-Projected Augmented Reality Interface for Marking Surgical Targets in Computer Aided Surgery (컴퓨터 기반 수술시 환부표시를 위한 직접투사형 증강현실 인터페이스)

  • Seo, Byung-Kuk;Kang, Gap-Chul;Park, Jong-Il
    • Journal of Biomedical Engineering Research
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    • v.28 no.6
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    • pp.786-790
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    • 2007
  • Up to now, surgeons have operated while peering at images which visualize the medical state of the patient such as MRI or CT images. On the other hand, direct-projected augmented reality technology liberates surgeons from the inconvenience by directly projecting medical information onto the patient's body. However surgeons still feel inconvenient when they mark surgical targets for planning an operation because they use an ink pen which is difficult to modify or delete and is also likely to be unsanitary. In this paper, we resolve these problems by proposing an interactive user interface based on direct-projected augmented reality technology and its validity is shown in experimental results.

Numerical Study on the Characteristics of Butane Fuels (부탄 연료의 연소 특성에 관한 수치해석적 연구)

  • Choi, Sul-Ki;Baik, Doo-Sung;Lee, Jong-Sun
    • Proceedings of the KAIS Fall Conference
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    • 2009.12a
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    • pp.897-899
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    • 2009
  • 본 연구는 수치해석 코드를 사용하여 액화석유가스의 연소 특성을 파악하고자 한다. 시뮬레이션은 Chemkin 코드를 적용하여 정적연소와 같은 조건에서 모델링되었다. 특히 연소 현상을 파악하기 위해서 당량비를 변화시켰다. 이러한 연구는 LPG 연료를 사용하는 압축착화 디젤엔진의 기초적인 연구에 도움을 줄 것이다.

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Structural Analysis of Hydraulic Valve Meter (밸브 수압측정기의 구조해석)

  • Lee, Jong-Sun;Shin, Bum-Hoon
    • Proceedings of the KAIS Fall Conference
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    • 2011.05b
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    • pp.947-950
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    • 2011
  • 기존의 밸브 수압측정기는 압력조절을 수동으로 조절함으로서 정확한 압력측정을 할 수 없는 불편함이 있었다. 이를 밸브의 수압측정 시 압력조절센서를 이용하여 압력조절을 안전하고 정확하게 개선한다. 또한 3차원 유한요소 코드인 ANSYS를 활용하여 설계된 수압측정기에 대하여 구조해석을 수행하여 수압측정기 내부압력에 따른 내부누수, 응력, 변형률, 총변형량 등을 구하였다.

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