• Proceedings of the Computational Structural Engineering Institute Conference
• /
• 2011.04a
• /
• pp.231-234
• /
• 2011

본 논문은 교량의 안전진단을 위한 각 부재의 명명체계에 따라 직선형 교량모델의 각 부재에 대한 솔리드 객체의 고유번호를 일괄적으로 부여하기 위한 방법론을 제시한다. 개발된 방법론은 크게 3 단계의 프로세스로 이루어진다. 먼저, 부재의 종류별로 구분된 레이어로부터 각 부재에 대한 솔리드 객체의 도심을 추출하고, 이를 시점과 종점으로 이루어진 교축방향을 축으로 한 국부좌표계에 대해 변환한다. 이후 교축방향으로 정렬되는 객체를 식별하여 그룹핑하고 이를 교축 및 교축의 직각방향으로 순서로 정렬한다. 마지막으로 각 그룹 내 세그먼트들을 교축방향으로 정렬한다. 개발된 방법론에 따른 시범 응용모듈을 개발하였으며, 트러스 구조와 서로 다른 모델 좌표계를 가진 시범 교량모델을 대상으로 추출된 그룹의 개수와 각 객체의 명칭을 원래의 모델과 비교하여 그 적용성을 검토하였다.

• Journal of the Korea Institute of Information and Communication Engineering
• /
• v.6 no.5
• /
• pp.747-754
• /
• 2002

We propose a Web-based collaborative CAD system which is independent from any platforms, and develop a 3D solid modeler in the system. We developed a new prototype of 3D solid modeler based on the web using Java 3D API, which could be executed without any 3D graphics software and worked collaboratively interacting with each user. The modeler can create primitive objects and get various 3D objects by using loader. The interactive control is available to manipulate-objects such as picking, translating, rotating, zooming. Users connect to this solid modeler and they can create 3D objects and modify them as they want. When this solid modeler is imported to collaborative design system, it will be proved its real worth in today's CAD system. Moreover, if we improve this solid modeler adding to the 3D graphic features such as rendering and animation, it will be able to support more detail design and effect view.

• The Journal of Korean Institute of Communications and Information Sciences
• /
• v.27 no.10C
• /
• pp.912-920
• /
• 2002

As computer systems and communication technologies develop rapidly, CSCW(Computer Supported Collaborative Work) system appears nowadays, through which it is available to work on virtual space without any restriction of time and place. Most of CWCS systems depend on a special network and groupware. The systems of graphics and CAD are not so many because they are specified by hardware and application software. We propose a Web-based collaborative CAD system which is independent from any platforms, and develop a 3D solid modeler in the system. This system can be worked in the environment of Client/Server architecture. Clients connect to the design server through Java applet on WWW. The server is implemented by Java application.

• KSCE Journal of Civil and Environmental Engineering Research
• /
• v.34 no.2
• /
• pp.655-666
• /
• 2014

Recently, as the appearance and exterior design of the construction structure are highlighted, the irregularly shaped structures are increasing in a construction facility. Many softwares provide a quantity take-off function of 3D object under BIM environment, however, they are focused on the limited function based on the solid modeling method. Because the vast geometric information of the curved surface is difficult to extract in the 3D objects that consist of major changes in vertical section shape as the irregularly shaped structures, it is difficult to express a 3D object as a solid model. On the other hand, the irregularly shaped structures can be expressed in relatively free in the surface model because the surface model consists of points, lines and surfaces. Accordingly, the surface modeling method is suitable for the modeling of large irregularly shaped structures. This study suggests a quantity take-off algorithm for the irregularly shaped structures using the surface modeling approach that is beneficial in the design work of structures. Some case projects are used for verifying the accuracy of the proposed method.

• Journal of the Computational Structural Engineering Institute of Korea
• /
• v.27 no.6
• /
• pp.557-564
• /
• 2014

In this study, we present an algorithm that conducts an unique naming process for the bridge object through the solid object identification focused on 3D straight bridge model. For the recognition of 3D objects, the numerical algorithm utilizes centroid point, and solid object on the local coordination system. It classifies the object feature set by classifying the objects and members based on the bridge direction. By doing so, unique names, which contain the information about span, members and order of the object, were determined and the suitability of this naming algorithm was examined through a truss bridge model and a bridge model with different coordinate systems. Also, the naming process based on the object feature set was carried out for the real 3D bridge model and then was applied to the module on local server and mobile device for real bridge inspection work. From the comparison of the developed naming algorithm based on object identification and the conventional one based on field inspection, it was shown that the conventional field inspection work can be effectively improved.

• Proceedings of the Korea Information Processing Society Conference
• /
• 2000.10a
• /
• pp.235-238
• /
• 2000

오늘날 컴퓨터와 통신 기술의 발달로 시간과 공간의 제약 없이 공유된 가상 공간에서 작업을 하는 컴퓨터 지원 협동 시스템이 등장하고 있다. 그러나 그래픽 분야와 CAD시스템은 하드웨어와 응용 소프트웨어에 크게 의존하고 있는 실정이다. 여기에서 제안하는 협동 CAD시스템은 인터넷 망을 통하여 웹 상에서 플랫폼에 구애받지 않고 협동작업이 이루어지도록 하였고, VRML과 Java3D API를 이용하여 쉽게 도형을 생성하고 편집하여 전송하거나 출력 저장할 수 있도록 하며, 채팅을 통해 인터액티브 한 작업이 가능하게 하고 있다. 이 시스템은 클라이언트/서버 구조로 클라이언트는 자바 애플릿을 통해 웹 상에서 접근하고 서버는 자바 애플리케이션으로 접속을 통제하는 접속관리자, 작업 그룹의 동기화를 유지하며 공유작업공간을 확보하는 작업관리자, 그리고 3차원 도형 객체를 생성해 내는 솔리드 모델러로 이루어져 있다.

• Journal of Internet of Things and Convergence
• /
• v.6 no.1
• /
• pp.97-102
• /
• 2020

Multi-Channel Switch ICs for IoT have integrated several solid state structure low ON-resistance bi-directional relay MOS switches with level shifter to drive high voltage and they should be independently controlled by external serialized logic control. These devices are designed for using in applications requiring high-voltage switching control by low-voltage control signals, such as medical ultra-sound imaging, ink-jet printer control, bare board open/short and leakage test system using Kelvin 4-terminal measurement method. This paper describes implementation of analog switch control block and its verification using Field programmable Gate Array (FPGA) test pattern generation. Each block has been implemented using Verilog hardware description language then simulated by Modelsim and prototyped in a FPGA board. Compare to conventional IC, The proposed architecture can be applied to fields where multiple entities need to be controlled simultaneously in the IoT environment and the proposed pattern generation method can be applied to test similar types of ICs.

• Journal of the Korea Institute of Information and Communication Engineering
• /
• v.4 no.4
• /
• pp.767-773
• /
• 2000

As computer systems and communication technologies develop rapidly, CSCW(Computer Supported Collaborative Work) system appears nowadays, through which it is available to work on virtual space without any restriction of time and place. Most of CWCS systems depend on a special network and groupware. The systems of graphics and CAD are not so many because they are specified by hardware and application software. In this paper, we propose a web-based collaborative CAD system, which can be jointly worked on Internet WWW being independent from any platforms. It can create and modify 3D objects easily using VRML and Java 3D API, and it can send, print, and store them. The interactive work for designing objects can be also carried out through chatting with each other. This system is executed in the environment of Client/server architecture. Clients connect to the CAD sewer through Java applet on WWW. The server is implemented by Java application, and it consists of three components : connection manager which controls the contact to users, work manager which keeps viewing in concurrency and provides virtual work space sharing with others, and solid modeler which creates 3D object.