• Proceedings of the Korea Committee for Ocean Resources and Engineering Conference
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• 2004.11a
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• pp.79-84
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• 2004

In this study, a robot welding programming system is developed for gantry-type robot using a neutral CAD data format. The system automatically extracts welding line data from tile CAD model represented in IGES format and generates a robot program based on the weld line extracted. The welding program is simulated jar verification by using IGRlP, a virtual manufacturing solution. The robot welding programming system is demonstrated with a simple example.

• Electronics and Telecommunications Trends
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• v.25 no.4
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• pp.121-129
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• 2010

FCC가 2005년 인터넷상에서 콘텐츠, 애플리케이션, 단말기의 비차별적 접속을 보장하기 위해 망중립성 4원칙을 발표한 이후 망중립성 원칙의 타당성에 대한 찬반 논란이 계속되어 왔다. 2008년에는 Comcast의 파일공유사이트 접속 차단 조치에 대해서 FCC가 망중립성 원칙 위반행위로 판정하여 중지 명령(Comcast order)을 내린 바 있다. 그러나 2010년 4월 사법부가 2008년 FCC의 Comcast order를 무효화함에 따라 망중립성 원칙 적용을 시도하던 FCC의 노력이 무산될 위기에 놓여 있다. 본 고에서는 FCC의 망중립성 원칙 제시 배경과 추진 경과, 사법부의 최근 판결내용, 이해당사자의 찬반 논란을 살펴보고 향후 망중립성 원칙의 법적 근거를 마련하기 위한 FCC의 선택지(option)를 전망하고자 한다.

• Journal of the Society of Naval Architects of Korea
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• v.53 no.1
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• pp.18-28
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• 2016

In shipbuilding, the scheduling system is susceptible to sudden changes and thus it turns to be difficult to predict the differences between schedule and production records in advance. A computer-based simulation is commonly utilized to overcome the discrepancies occurred in estimating workloads and resulting processing times. The main drawback of this simulation-based solution is its limited applicability because, in most cases, each shipyard requires specific and customized simulation environment. By standardizing the planning data of the midterm scheduling system, as proposed in this paper, the efficiency of the current simulation model can be enhanced. To present an alternative approach, this paper begins with the analysis of the complex planning data structure of several shipyards and then proceeds to construct a standard data structure based on the neutral format. An interface application is developed for the data transaction and simulation in on-line environment. As a result, a simulation-based production management of shipyards can be achieved by the efficient prediction of planning and scheduling.

• Journal of Digital Convergence
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• v.12 no.1
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• pp.13-21
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• 2014

The problem of the cases of Soribada and Winny is their duplexity that they could be used legally and illegally. The issue called 'The crime of aiding through the neutral behavior' is about whether the program developer who shared the file sharing program letting unspecified public infringe the copyright could be punished or not. Many theories about limiting the traditional scope of punishment of aider have been maintained. However, it is questionable whether it is possible to limit the scope of punishment following the former cases and theories even for the action that is causal and facilitates the principal's criminal conduct, like the aid through the neutral action which is hard to perceive as illegal aid because of its characteristics. Therefore, using the case of Soribada in Korea and the case of Winny in Japan as the examples of illegal aid through neutral behavior case, this paper examines the characteristics and problems of aid through existing theories and cases, and suggests new scope of punishment limitation standard through the elaboration of the action of aid and judgment of degree.

• Proceedings of the Korea Concrete Institute Conference
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• 2009.05a
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• pp.41-42
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• 2009

The purpose of this paper is to inspect a structural performance for the composite wall pile through static bending test. In result, all specimen came to failure in 1.8 times cracking load and the drift of the neutral axis on a load increasing occurred.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.20 no.1
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• pp.1-9
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• 2020

In highly complex EPC(engineering, procurement, construction)-based manufacturing processes such as shipbuilding and marine plants, it is essential to prepare a way to enable organic working at the site referring to each other's detailed working data for collaboration between partner companies. However, companies cannot share the progress of the sites including working information in real-time due to the use of SW unique to each company and the complex site management system. As a result, the construction process is delayed, and resources are used inefficiently. This study developed a neutral data generation algorithm that can apply the working information in various file formats to a collaborative manufacturing process. In addition, this study verified the accuracy of the algorithm by applying the developed algorithm to the manufacturing process of piping in shipbuilding and marine plants, developing the SW for visualization of working information using the generated neutral data, and comparing the coordinate, shape & dimension and the kind, number, and spec. of BOM. The result confirmed that the accuracy of the coordinate of the neutral data was 99%, and that of the shape & dimension of the neutral data and BOM Spec. was both 100%. It is thought that this study can be used for overcoming the restrictions in information sharing due to the development of informatization at companies and maximizing the share of working file information in a complex manufacturing process.

• Proceedings of the Korean Operations and Management Science Society Conference
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• 1995.04a
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• pp.617-628
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• 1995

본 논문에서는 상용화된 이 기종 CAD/CAM 시스템간의 CAD 데이타 교환기능을 가지는 IGES Translator 시스템의 구조를 제안한다. 제품생산의 여러 단계에서 CAD/CAM의 사용이 보편화되어감에 따라 상용 CAD/CAM 시스템들은 응용분야에 맞는 특수한 도구로 사용되는 경향이 생겨났다. 예를 들어, ALIAS는 주로 스타일링 디자인에, I-DEAS와 PRO/ENGINEER는 엔지니어링 디자인에, EUCLID는 금형 디자인에, 그리고 OMEGA와 Z-MASTER는 NC 공구경로생성에 주로 사용되고 있다. CAD 데이타 교환을 위해 제안된 중립파일형식(Neutral File Format)중에서, IGES(Initial Graphics Exchange Specification)는 대부분의 상용 CAD/CAM 시스템에서 지원을 하고 있으며 가장 널리 쓰이는 파일형식이다. 그런데, IGES를 통한 CAD 데이타 교환은 다음과 같은 문제점들을 가지고 있다. 즉, patch의 사라짐, 경계곡선의 왜곡, patch의 overlap 또는 gap, trimming error, 곡면각의 꺾임각도 등이 그것이다. 이 논문의 목적은 이러한 문제점들을 해결할 수 있는 범용 IGES Translator를 개발하는데 있다. 이 논문의 주요한 기여 내용은 다음과 같다. 1) 주요 상용 CAD/CAM 시스템의 IGES Interface 기능의 비교 분석, 2) 주요 상용 IGES Translator의 기능 분석, 3) 사용자의 기능적 요구사항의 분석, 4) 사용자 관점 및 시스템 관점에서의 IGES Translator의 구조 제안, 5) Prototype IGES Translator의 개발 및 테스트 결과 제시.

• Proceedings of the Korea Society for Industrial Systems Conference
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• 2008.10b
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• pp.547-550
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• 2008

인터넷 서비스가 차별화 되어야 한다는 논의는 인터넷이 본격적으로 상용화된 1990넌대 중반부터 꾸준하게 제기되어 왔다. Tragedy of commons 라고 불리는 인터넷 혼잡현상은 지속적인 기술발전으로 인해서 상당부분 해결되었으나, 최근 들어서는, Web 2.0의 등장을 통해 동영상 파일이 차지하는 비중이 늘어나면서 P2P를 통한 파일교환이 전체 인터넷 트래픽의 상당 부분을 차지하면서, 또한 실시간 미디어, VoIP 등의 인터넷 응용 프로그램 등에서 전송상의 지연을 포함한 QoS 보장을 요구하게 되면서, 또한 통신사업자의 망중립성에 관한 논의가 진행되면서, 인터넷 서비스를 차별화하고, 통제하려는 연구의 중요성이 증대되고 있다. 본 연구는 인터넷 서비스를 차별화하기 위한 수단으로 기존에 제시되어온 자격과 우선순위라는 2개의 차원에서 그리고 가격제도로서 종가제와 종량제의 차원에서 배경을 검토해본 다음, 우선 대기열 이론과 혼잡성 제어 이론을 통해서 차별화된 서비스가 전체 시스템에어떤 구체적으로 효익을 가져오는 지를 검토하며, 우선순위와 사용시간에 따라 차별화되는 종량제가 현실에서 발견되지 않는 이유에 대한 이론적인 근거를 제시하고, 종량제를 채택했을 경우에 발생하는 문제점과 종량제 사용에서 발생하는 한계들을 논의하면서, 현실적으로 종량제와 차별가격을 도입할 때 발생할 수 있는 문제점들을 밝혀본다.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2001.04a
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• pp.414-417
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• 2001

In today's engineering world, any product development activity requires the expertise and the interaction of many different engineering. Therefore the various activities in a product development architecture are highly distributed and interdependent. The interdependence may be due to sharing of databases and transfer of information between various activities. This will require an integrated product model. That can support distributed design such that participants from different backgrounds collaborate towards one common goal. This paper presents the architecture of the product modeling system for the integration of CAD and CAE. It then reports on the study of STEP 10303 and UG open API focused on the integration of different technical environments.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 1997.10a
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• pp.500-503
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• 1997

In this paper, a method for recognizing 3-D objects using the 3-D Hough transform and the robust stereo vision is studied. A 3-D object is recognized through two steps; modeling step and matching step. In modeling step, features of the object are extracted by analyzing the IGES file. In matching step, the values of the sensed image are compared with those of the IGES file which is assumed to location and orientation in the 3-D Hough transform domain. Since we use the 3-D Hough transform domain of the input image directly, the sensitivity to the noise and the high computational complexity could be significantly allcv~ated. Also, the cost efficiency is improved using the robust stereo vision for obtaining depth map image which is needed for 3-D Hough transform. In order lo verify the proposed method, real telephone model is recognized. Thc results of the location and orientation of the model are presented.