• 한국CDE학회논문집
• /
• 제12권1호
• /
• pp.50-57
• /
• 2007

In recent years, many robotics researches have been focused on developing human-friendly robots, that is, humanoid biped robots. The researches of humanoid robots include various areas such as hardware development, control of biped locomotion, artificial intelligence, human interaction, etc. The present work concerns the hardware development of a mid-size humanoid robot, BONOBO, focusing on rapid development of outer body parts with integrated application if CAD/CAM/CAE/RP. Most parts are three-dimensionally designed using 3D CAD, and effectively connected with CAE analyses using both kinematic simulation and structural analysis. In order to reduce lead time and investment cost for parts developments, Rapid Prototyping (RP) and CAM are selectively utilized for manufacturing body parts. These master parts are then replicated using the vacuum casting process, from which we can obtain plastic parts repeatedly. Through this integrated approach, the first prototype of BONOBO can be successfully developed with relatively low time and investment costs.

• 한국의상디자인학회지
• /
• 제11권2호
• /
• pp.43-53
• /
• 2009

The purpose of this study is to show inherent and differentiated beauty by designing costume knitwear using Dancho patterns representing peculiar beauty, thus expressing free and convenient knitwear in the modern sense for women with the image of reasonableness and elegance, proposing knit design using high-class materials for satisfying the demand for the highest. With regard to expression technique of works, I selected computer Jacquard method to indicate effective comparison effect of expression material and made expression with $12{\sim}14$ gauge as base by using computer knitting machine. Through above-mentioned research process and design using Knit CAD system, I obtained following conclusion. First, it is possible to express variously and widely traditional patterns by making the most of the beauty of the orient and by recomposing the patterns of plant patterns representing "feminine image". Second, it is possible to widely represent the sense you can feel from knit by expressing variously diversity of knit structure and Jacquard knitting structure and gauge. Finally, it is possible to express designs more freely and imaginably by using computer Knit CAD system instead of actual knitting of various knit expression technique and materials application.

• 한국기계연구소 소보
• /
• 통권19호
• /
• pp.155-161
• /
• 1989

Generally cam-follower systems consist of two elements: Cam is for rotating motion and follower for reciprocating motion. Depending on the shape of cam and type of follower, the motion of cam-follower system is determined. Thus design process and analysis process must be well defined. The design process means to find the coordinates of cam shape which can be defined the given motion of follower and the analysis process means to determine the motion curve of follower corresponding to the given cam based on the dimensions of a cam-follower system. This paper consists of two parts : One is for development of a numerical method for design and analysis of cam-follower systems, the other is for development of a CAD program and its application. As the second part of the paper, the structure of a CAD program is introduced. Four data files are used in the program where the design process and the analysis process are carried out interactively to en hence its availability to the industrial applications. The first part of the paper 'presents the iterative contact method which can determine the contact points and their angles between cam and roller.

• 한국CDE학회논문집
• /
• 제19권4호
• /
• pp.434-442
• /
• 2014

Most manufacturing enterprises create CAD data as a result of the product/part design process; however, the CAD data is being utilized only for production activities. Besides the processes directly related to manufacturing such as design and production, the CAD data is an important resource that can be used in variety of services (e.g., catalog production and production manuals) for manufacturing enterprises. This study proposes a software platform that can support a wide range of services for manufacturing companies in an efficient and productive way. The software platform was designed based on the functions identified by requirement analysis. The platform consists of four layers: data model layer to manage relevant data; library layer and common function layer to configure services; and application layer to install and run the software. Finally, this study evaluates the validity of the proposed platform architecture by applying it to the digital catalog system.

• 한국전산유체공학회지
• /
• 제12권4호
• /
• pp.68-73
• /
• 2007

Computational Fluid Dynamics (CFD) approach is now playing an important role in the engineering process in these days. Generating proper grid system in time for the region of interest is prerequisite for the efficient numerical calculation of flow physics using CFD approach. Grid generation is, however, usually considered as a major obstacle for a routine and successful application of numerical approaches in the engineering process. CFD approach based on the unstructured grid system is gaining popularity due to its simplicity and efficiency for generating grid system compared to the structured grid approaches, especially for complex geometries. In this paper an automated triangular surface grid generation using CAD(Computer Aided Design) surface data is proposed. According to the present method, the CAD surface data imported in the STL(Stereo-lithography) format is processed to identify feature edges defining the topology and geometry of the surface shape first. When the feature edges are identified, node points along the edges are distributed. The initial fronts which connect those feature edge nodes are constructed and then they are advanced along the CAD surface data inward until the surface is fully covered by triangular surface grid cells using Advancing Front Method. It is found that this approach can be implemented in an automated way successfully saving man-hours and reducing human-errors in generating triangular surface grid system.

• 한국공작기계학회:학술대회논문집
• /
• 한국공작기계학회 2005년도 춘계학술대회 논문집
• /
• pp.115-124
• /
• 2005

This paper analyzes the problems that occurred in the magnification process for a fine input image and investigates a method to improve the problems. This paper applies a curve interpolation algorithm in CAD/CAM for the same test images with the existing image algorithm in order to improve the problems. As a result. the nearest neighbor interpolation. which is the most frequently applied algorithm for the existing image interpolation algorithm. shows that the identification of a magnified image is not possible. Therefore. this study examines an interpolation of gray-level data by applying a low-pass spatial filter and verifies that a bilinear interpolation presents a lack of property that accentuates the boundary of the image where the image is largely changed. The periodic B-spline interpolation algorithm used for curve interpolation in CAD/CAM can remove the blurring but shows a problem of obscuration, and the Ferguson's curve interpolation algorithm shows a more sharpened image than that of the periodic B-spline algorithm. For the future study, hereafter. this study will develop an interpolation algorithm that has an excel lent improvement for the boundary of the image and continuous and flexible property by using the NURBS. Ferguson's complex surface. and Bezier surface used in CAD/CAM engineering based on. the results of this study.

• 한국정보처리학회논문지
• /
• 제6권12호
• /
• pp.3435-3446
• /
• 1999

CAD툴을 손 재활수술에 응용하는 것은 새로운 시도이다. 현재까지 힘줄이식수술과 같은 복잡한손 재활 수술에 있어서 외과의사를 보조할 수 있는 시스템은 거의 없는 것으로 사료된다. 대부분의 힘줄 이식수술은 의사의 다년간 시술로 축적된 의학적 지식과 경험에 의해 행해지는 것이 보통이다. 그러나 힘줄이식수술에 이러한 힘줄경로설계를 위한 CAD 툴을 활용한다면 최선의 시술계획과 평가가 가능하게 될 것이다. 이 연구의 목적은 힘줄이식수술이 좀더 객관적이고 정량적으로 행해질 수 있도록 환자의 손을 기구학적으로 모델링한 후 표준 그래픽스 라이브러리를 사용하여 프로토타입 힘줄경로설계용 CAD툴을 디자인하는데 있다.

• 대한치과보철학회지
• /
• 제56권3호
• /
• pp.188-198
• /
• 2018

목적: 최근 디지털 기술의 발달과 더불어 치과영역에서도 다양한 보철물 제작을 위해 Computer aided design/computer aided manufacture (CAD/CAM) 시스템의 사용이 확대되고 있다. CAD/CAM 시스템은 전통적인 방식의 보철물 제작의 단점을 극복하여, 치과의사와 치기공사가 보철물을 제작할 때, 환자에게 한 두 번의 병원 방문으로도 정확하고 정밀도 높은 보철물의 제공이 가능하게 할 수 있다. 본 논문은 현재 국내의 CAD/CAM 시스템 현황 및 인식을 파악함으로써 새로 장비를 도입할 때 고려해야 할 항목에 대한 조언을 제공하고자 한다. 대상 및 방법: 본 설문 조사는 서울대학교 치과 병원을 포함한 전국 298 명의 치과의사, 치과위생사 및 치과기공사를 대상으로 2016년 11월부터 12월까지 2 개월간 우편을 통해 실시하였다. 결과: 치과용 CAD/CAM 밀링기 구매 시 가장 고려하는 요인은 밀링기의 성능(64.43%)이었으며 용도는 치과보철물 제작과 임플란트용 맞춤형 지대주 제작이 49.33%로 가장 높았다. 또한, 응답자의 약 60% 이상이 CAD/CAM 밀링기가 만족할 만한 성능으로 개선된다면 새로운 장비의 구매에 대해 긍정적인 답변을 보였다. 결론: 설문조사 분석결과, 성능이 개선된 CAD/CAM 밀링기 디지털화 및 4차 산업혁명을 대비하는 치과산업에서 중요한 역할을 할 것으로 여겨진다.

• International Journal of CAD/CAM
• /
• 제3권1_2호
• /
• pp.51-60
• /
• 2003

The growth of the World Wide Web and the advances in high-speed network access have greatly changed existing CAD/CAE environment. The WWW has enabled us to share various distributed product data and to collaborate in the design process. An international standard for the product model data, STEP, and a standard for the distributed object technology, CORBA, are very important technological components for the interoperability in the advanced design and manufacturing environment. These two technologies provide background for the sharing of product data and the integration of applications on the network. This paper describes a distributed CAD/CAE environment that is integrated on the network by CORBA and product model data standard STEP. Several prototype application modules were implemented to verify the proposed concept and the test result is discussed. Finite element analysis server are further distributed into several frontal servers for the implementation of distributed parallel solution of finite element system equations. Distributed computation of analysis server is also implemented by using CORBA for the generalization of the proposed method.

• 대한인간공학회:학술대회논문집
• /
• 대한인간공학회 1992년도 추계학술대회논문집
• /
• pp.54-62
• /
• 1992

This work has been directed at studying and developing a prototype Computer Aided Design(CAD) tool to be used for planning tendon paths in hand reconstructive surgery. The application of CAD to rehabilitative surgery of the hand is a new field of endeavor. There are currently no existing systems designed to assist the orthopedic surgeon in planning these complex peocedures. Additionally, orthopedic surgeons are not trained in mechanics, kinematics, math modeling, or the use of computers. It was also our intent to study the mechanisms and the efficacy of the application of CAD techniques to this important aspect of hand surgery. The following advances are reported here: Interactive 3D tendon path definition tools., Software to calculate tendon excursion from an arbitrary tendon path crossing any number of joints., A model to interactively compute and display the foirces in muscle and tendon., A workstation environment to help surgeons evaluate the consequences of a simulated tendon transfer operation when a tendon is lengthened, rerouted, or reattached in a mew location., It also has been one of the primary concerns in this work that an interactive graphical surgical workstation must present a natural, user-friendly environment to the orthopedic durgeon user. The surgical workstation must ultimately aid the surgeon in helping his patient or in doing his work more efficiently or more reliably.