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池海成,鄭海鎔 弘益大學校 科學技術硏究所 2000 科學技術硏究論文集 Vol.11 No.-
Rapid prototyping (RP) technologies have an ability of creating a physical part directly from its computer model by adding material on a layer by layer basis. Since actual production of a physical model using traditional techniques has been quite expensive, a prototyping apparatus like Stereolithography can recently be used to get physical verification of a product design rapid and economic. In spite of this tremendous progress in fabrication, many problems remain unsolved including several geometric issues that must be resolved in coming years before these technologies are in common use. The biggest problem lies in their standard file format for CAD data exchange. Current method using the de facto industry standard STL data format have at times resulted in problems such as accuracy, redundancy, and integrity in its representing CAD models. In this paper, a general explanation about why a next generation of data exchange standard for RP technologies is needed, why it must be based on a solid model, and what its major advantages are given.
池海成,李大善 弘益大學校 科學技術硏究所 1999 科學技術硏究論文集 Vol.10 No.1
Rapid prototyping can fabricate physical models directly from the CAD models. Since actual production of a physical model using traditional techniques has been quite expensive, a prototyping apparatus like Stereolithography can recently be used to get physical verification of a product design rapid and economic. This, however, still costs some expenses enough to take an interest in more economic methods, visual simulation techniques. Development of an intermediate geometric model of the product design and careful inspection of its virtual shape before the real fabrication take no physical cost. In this paper we propose an image simulation method especially for supporting an rapid prototyping application. The method can demonstrate its capability of image simulation by comparing the simulated images with their physical models.
池海成,李秉烈 弘益大學校 科學技術硏究所 2001 科學技術硏究論文集 Vol.12 No.-
Nowadays, there are several different CAD softwares that can create product geometries with different applications. Similarly, most recent RP processes have quite different capabilities, and most are not even isotropic, so that machine-dependent information such as part orientation, position, and size during the fabrication process becomes a crucial issue in integrating a heterogeneous environment of CAD and RP processes using the data exchange standard. Current method using the de facto industry standard STL have at times resulted in problems such as accuracy, redundancy, and integrity in its representing CAD models. STEP is the upcoming standard. Many major companies are already working with it. This is one of the biggest reason why STEP can be a useful way of exchanging CAD-SFF data. This research project proposes a method of slicing and editing STEP-based RP models for the next generation data transfer paradigm between CAD systems and RP systems using STEP. As an approach for the purpose, this proposes a method for acquiring improved accuracy of 2D sliced layers in STEP with a tentative schema of SFF process features. The new data exchange standard must be compatible with, but independent of, process fabrication features. A software implementation of visualizing, editing, and slicing CAD model based on STEP information model for a complete data exchange is also proposed. As for future works, various optimal slicing algorithm will help acquire accurate RP parts.
신속성형기술 전용 형상 모델링 기술 개발-표면 미세돌기의 설계
池海成 弘益大學校 科學技術硏究所 1998 科學技術硏究論文集 Vol.9 No.1
This paper presents a geometrical modeling technique including an energy method for defining a regular texture field made by an RP apparatus. The texture field is supposed to be made from both a parametric surface and a non-analytic STL CAD model using an energy minimization analogy based on energy constraints. Designing surface texture for rapid prototyping, however, is difficult due to complex macro-structure of the tiny texture geometry that must be compatible with the non-traditional manufacturing method of rapid prototyping. An application of geometric modeling techniques to development of a computer-aided design tool for solving the addressed problems is proposed in this paper. Manufacturing constraints are identified, formulated, and introduced into a unified design constraints framework being incorporated into the design of a texture cell. Also, an energy minimizing parametric geometry is devised and implemented to create an optimal texture geometry.
Escherichia coli 패혈증 환자에 합병된 대칭적 하지 말단 괴사증 1예
남해성,유진홍,권순석,민준기,조현선,박민경,심병주,남유정,이지인,김진수,길욱현,조근종,신완식 대한감염학회 2005 감염과 화학요법 Vol.37 No.6
We have encountered a rare case of symmetrical peripheral gangrene complicating Escherichia coli sepsis in a 47-years-old male. He was successfully treated with antibiotics, anticoagulants, and vasodilator. To our knowledge, this is the first report on symmetrical peripheral gangrene complicating E. coli sepsis in Korea.
蘇鉉哲,池海成 弘益大學校 科學技術硏究所 2005 科學技術硏究論文集 Vol.16 No.-
The most commonly used variation simulation analysis methods for assemblies have been worst case analysis, root sum square method, and Monte Carlo simulation, which the individual parts of assemblies are considered as rigid bodies. Assembly tolerance, sometimes, requires the consideration of its compliance because of potentially significant deformation during the spot-weld assembly process in automobile industry. A relationship, called sensitivity, between the assembled part deviation vector for incoming components and tooling hence has been found for a unified linear variation model. In this method, it is important to take into account of the covariance between the sources of variation as they are closely located, which is the case in most auto body assembly. This research is done on the CAVA (Compliant Assembly Variation Analysis) model, which is a variation simulation model for single station level, In the CAVA model, only results for part representation are obtained and the contact effects will be solved in the future research.