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미성형 방지 최적 조건 생성을 위한 지식형 설계 시스템
허용정 한국기술교육대학교 1997 論文集 Vol.4 No.1
Among the tasks of mold design, the decision of optimal filling conditions in order to avoid short shot and optimize some objectives is quite complicated because the causality of process conditions and a part quality is highly coupled. In this paper, I have constructed an Expert System for the generation of optimal filling conditions to avoid short shot which combines a knowledge-based system and optimization methodology with CAE software.
반도체 칩 캡슐화를 위한 트랜스퍼 금형 캐비티에서의 유동해석과 성형조건 최적화에 관한 연구
허용정 韓國技術敎育大學校 1995 論文集 Vol.2 No.1
An Effort has been made to more accurately analyze the flow in the chip cavity, particularly to model the flow through the openings in the leadframe and correctly treat the thermal boundary condition at the leadfreame. The theoretical analysis of the flow has been done by using the Hele-Shaw approximation in each cavity separated by a leadframe. The cross-flow through the openings in the leadframe has been incorporated into the Hele-Shaw formulation as a mass source tern. The optimization program based on the complex method integrated with flow analysis program has been successfully used to obtain the optimal filling conditions to avoid short shot.
허용정,홍성도,임사환 한국반도체디스플레이기술학회 2011 반도체디스플레이기술학회지 Vol.10 No.3
Recently the government banners green growth promises as a paradigm of national development which are to reduce greenhouse gases and environmental pollution by exhaust gases from automobiles. Existing in all countries around the world by using fossil fuels to minimize environmental changes are developing a new alternative energy sources. Among the emerging alternative energy, using solar energy technology is applied across the industry, but the maintenance and repair to integrate solar cells and has been a problem occurs. To prolong the life of cells integrated on a solar cell is exposed when the non-eye, etc., when not integrated by the solar cells should not be exposed. In order to resolve these contradictions, a intellectual solar green street lighting was developed by using Q(Quick)-TRIZ .
허용정,이성철 한국기술교육대학교 2003 論文集 Vol.10 No.1
In injection molded parts, the ribs require more complicated mold cavities and cores. But it is necessary for the parts to attach the ribs for assembly, moldability and other functional purposes. To design them appropriately considering structural strength and injection molding, the profound knowledge that includes moldability, causal effects on the properties of the part is needed. This paper describes the design methodology which enables easy, simple, time and cost-effective design for the features.
허용정,김병구,이장무 대한기계학회 1983 대한기계학회논문집 Vol.7 No.2
The purpose of this study is to determine the general frequency expression for a rotating shaft of uniform cross section, supported by two bearings, and carrying flywheel at the free end. The bearing spacing and the ratio of the weight of flywheel to the total distributed weight are used as parameters. The data have thus been reduced to dimensionless form so that the results are generally applicable for this type of rotor. Frequencies for the first three modes of vibration are determined. Experimental investigation with rotor/flywheel model confirmed the critical speed frequencies lie between analytical models with simply supported-simply supported boundary conditions and spring supported-spring supported boundary conditions.
사출성형제품의 부형상 설계를 위한 지식형 CAD 시스템에 관한 연구
허용정,김상국 대한기계학회 1991 대한기계학회논문집 Vol.15 No.6
본 연구에서는 특징형상기반 CAD 시스템의 기계가공을 고려한 기하학적 모델 링 기능과 부형상의 합성과 해석을 위한 사출성형에 관한 광범위한 지식을 연계, 종합 한 형태의 지식형 CAD 시스템을 제안하였다. The synthesis of supplementary features of injection molded parts has been done empirically, since it requires profound knowledge about the features' moldability and causal effects on the properties of the part, which are not available to designers through current CAD systems. RIBBER is a knowledge module which contains knowledge to permit non-experts as well as mold design experts to generate acceptable supplementary features of injection molded parts. A knowledge-based CAD system is constructed by adding the knowledge module, RIBBER, for mold feature synthesis and appropriate CAE programs for mold design analysis to an existing geometric modeler in order to provide designers, at the initial design stage, with comprehensive process knowledge-based CAD system is a new tool which enables the concurrent design and CIM with integrated and balanced design decisions at the initial design stage of injection molding.
전문가 시스템 기법을 이용한 사출성형 해석 및 평가 시스템에 관한 연구
허용정 韓國技術敎育大學校 1996 論文集 Vol.3 No.1
The design and manufacture of injection molded polymeric parts with desired properties is a costly process dominated by empiricism, including the interactive modification of prototype toolings. In this paper, an interactive computer-based design system for injection molding is developed in order to realize the concept of rational design for the productivity and quality of mold making. The knowledge-based synthesis system being developed in this paper combines a rule-based expert system with analytical process simulation programs in a synergistical manner. Quick and logical evaluations on the design of molded parts can be made on the scientific analysis and the accumulated experts' knowledge.
A Study on the Estimation of Damage by Leaking of NH<sub>3</sub> and Cl<sub>2</sub> applied to LPCVD
허용정,임사환,Huh, Yong-Jeong,Leem, Sa-Hwan The Korean Institute of GAS 2014 한국가스학회지 Vol.18 No.5
첨단과학이 발전하면서 반도체의 필요성은 끊임없이 요구되고 있으며, 이러한 반도체 공정에서는 다량의 독성가스를 이용한 공정이 많다. 이러한 공정에서 가스의 누설로 인한 사고의 위험성은 항상 내재되어 있는 실정이다. 특히 국내 독성가스 사고는 암모니아와 염소에 의한 사고가 대부분이다. 따라서 본 논문에서는 LPCVD 공정에서 사용하는 암모니아와 염소의 누출로 인한 피해를 예측하여 안전에 만전을 기하고자 한다. As high-tech science has developed, the need of semiconductor is required constantly. However, there are many processes which use a great deal of poisonous gas in the semiconductor process, so the dangerousness by a gas leak is latent in these processes. Especially, the accident of toxic gas is almost made by ammonia and chlorine. Therefore this report estimates the damage by the leak of ammonia and chlorine used in LPCVD system.
역추적식 반사체를 가진 태양광 발전 시스템의TRIZ(6SC) 응용 설계
허용정,홍성도 한국반도체디스플레이기술학회 2012 반도체디스플레이기술학회지 Vol.11 No.3
This paper presents a study on the design of photovoltaic system with reversal tracking reflector. The reversal tracking reflector is conceptually designed by using TRIZ. The 20 to 30% of incident rays cannot produce the current and reflected back to the glass surface because of high refractive index of solar cell which are produced from Si, GaAs. The solution of this problem has been derived using 6SC(6 steps creativity)TRIZ. The reflector which has the actuator can be trackback the sun. Reversal tracking reflector which mounted on the top of the system prevents the shadowing loss and improve the efficiency of track back function. The anti-glare reflector prevents the heat due to the concentrated reflected light rays.