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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.
A Study on the Estimation of Damage by Leaking of NH3 and Cl2 applied to LPCVD
허용정,임사환 한국가스학회 2014 한국가스학회지 Vol.18 No.5
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 thedangerousness by a gas leak is latent in these processes. Especially, the accident of toxic gas is almost made byammonia and chlorine. Therefore this report estimates the damage by the leak of ammonia and chlorine usedin LPCVD system.
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.
병렬형 합성곱 신경망을 이용한 골절합용 판의 탐지 성능 비교에 관한 연구
허용정,이송연 한국반도체디스플레이기술학회 2022 반도체디스플레이기술학회지 Vol.21 No.3
In this study, we produced defect detection models using parallel convolution neural networks. If convolution neural networks are constructed parallel type, the model’s detection accuracy will increase and detection time will decrease. We produced parallel-type defect detection models using 4 types of convolutional algorithms. The performance of models was evaluated using evaluation indicators. The model’s performance is detection accuracy and detection time. We compared the performance of each parallel model. The detection accuracy of the model using AlexNet is 97 % and the detection time is 0.3 seconds. We confirmed that when AlexNet algorithm is constructed parallel type, the model has the highest performance.
챔버 내부의 질소 농도에 따른 3D프린팅 출력물의 인장 강도에 관한 연구
허용정,이송연 한국반도체디스플레이기술학회 2022 반도체디스플레이기술학회지 Vol.21 No.1
Scaffolds are the structures that safely protect sensors in various parts of the body. Because of scaffolds must protect sensors from load, the tensile strength of the scaffolds must be higher than 750 kgf/㎠. Currently, the tensile strength of scaffolds made with the 3d printer is 714 kgf/㎠. We confirm that the tensile strength of the scaffolds increase using air with high nitrogen concentration. In this study, we conducted experiments to find nitrogen concentrations in which the tensile strength of the specimen is higher than 750 kgf/㎠. The nitrogen control device and the nitrogen concentration sensor were installed in the chamber type 3d printer. The nitrogen concentration inside the 3d printer was changed by 5 % from 80 % to 100 %. Specimens of ASTM D 638 standard were produced under changed nitrogen concentration. We measured the tensile strength of specimens. We compared the tensile strength of specimens produced under each nitrogen concentration. We confirmed that when air with nitrogen concentration of 90 % was used, the tensile strength of scaffolds were 762 kgf/㎠.
바람 증폭 장치를 가진 태양전지 오염방지시스템의TRIZ(6SC) 응용 설계
허용정,홍성도,김재민 한국반도체디스플레이기술학회 2013 반도체디스플레이기술학회지 Vol.12 No.2
This paper presents a study on the design for contamination preventation system of solar battery. The system of contamination preventation has an wind amplifier. Wind amplifier is conceptually designed by using TRIZ. The surface of solar battery is covered with dust during accumulate the energy. The dust cause reduce power of photovoltaic module and efficiency drop of photovoltaic system. Reflect and absorb of incident ray are caused by the dust on surface of solar battery. The solution of this problem has been derived using 6SC(6 steps creativity)TRIZ. The wind amplifier which has structure such as funnel shape. The incident wind in the wide hole is amplified by the gate become narrow. The system of contamination preventation with wind amplifier which mounted on the side of the solar battery surface reduces the reflect and absorb and improve the efficiency of photovoltaic system.
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.