• 한국정밀공학회지
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• 제18권8호
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• pp.164-173
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• 2001

The configuration of injection molded part can be classified into primary feature and supplementary feature. Even though supplementary features such as ribs, snap fits and bosses make mold more complicated, which cause the increasement of the mold cost, supplementary features should be attached to primary features because of assembly, reinforcement, moldability and other functional purposes. But it is not easy for novice designers to design them appropriately because of the profound knowledge related to Injection molding. In this paper, the intelligent design tool called ISFD(Intelligent Supplementary Feature Designer) which supplies easy, simple, time and cost-effective design method has been studied and developed. A knowledge-based design 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.

• 대한기계학회논문집
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• 제15권6호
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• pp.1933-1947
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• 1991

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.

• 한국방송∙미디어공학회:학술대회논문집
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• 한국방송공학회 2009년도 IWAIT
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• pp.606-611
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• 2009

This paper describes a method for achieving a novel design within a class of 3D objects that would create a preferred impression on users. Physical parameters of the 3D objects that might strongly contribute to their visual impressions are sought through computational investigation of the impression ratings obtained for learning samples. "Car body" was selected as the class of 3D objects to be investigated. A morphable 3D model of car bodies that describes the variations in appearance using a smaller number of parameters was obtained. Based on each car body's rating for the impression of speediness obtained by paired comparison, the visual impression was transformed by manipulating the parameters defined in the morphable 3D model. The validity of the proposed method was confirmed by psychological experiments. A new scheme is also proposed to properly re-sample a novel object of a peculiar shape so that such an object could also be represented by the morphable 3D model.

• 한국정밀공학회지
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• 제12권10호
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• pp.32-39
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• 1995

The design of injection molded polymeric parts has been done empirically, since it requires profound knowledge about the moldability and causal effects on the properties of the part, which are not available to designers through current CAD systems. An interactive computer-based design system is developed in order to realize the concept of rational design for the productivity and quality of mold making. The knowledge-based CAD system is constructed by adding the knowledge -base module for mold feature synthesis and appropriate CAE programs for mold design analysis in order to provide designers, at the initial design stage, with comprehensive process knowledge for feature synthesis, performance analysis and feature-based geometric modeling. A knowledge-based CAD system is a new tool which enables the concurrent design with integrated and balanced design decisions at the initial design stage of injection molding.

• 한국통신학회:학술대회논문집
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• 한국통신학회 2004년도 하계종합학술발표회논문초록집
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• pp.206-206
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• 2004

• 반도체디스플레이기술학회지
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• 제6권3호
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• pp.7-11
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• 2007

The design and manufacture of injection-molded parts with desired properties is a costly process dominated by empiricism, Including the repeated modification of actual tooling. The objective of this study is to obtain the good design of injection-molded polymeric parts using axiomatic design approach.

• 한국정보통신학회논문지
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• 제3권1호
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• pp.175-183
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• 1999

본 논문에서는 이동전화 망에서 제공되는 다양한 부가 서비스 중에서 원격 기능제어(RFC: Remote Feature Control) 서비스를 위한 망 구성 및 RFC 서비스에 사용되는 이동전화 망의 프로토콜인 No. 7 신호 방식의 IS-41.A 규격과 RFC 기본 동작에 대해서 분석하고, RFC 서비스를 제공함에 있어서 일부 아날로그 시스템에서 발생하는 신호처리 절차의 오류를 추출하여 이를 해결하기 위한 세 가지 방안을 제안한다 또한 제안한 방법들에 대해 상세한 신호의 알고리즘을 분석하고, 시뮬레이션을 통하여 자각의 방안들 중에서 발생하는 문제점을 살펴봄으로서 효과적인 방안을 제시하도록 한다.

• 한국멀티미디어학회논문지
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• 제7권7호
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• pp.877-885
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• 2004

본 논문은 여러 가지 장면 검출 방식들 중 강인한 특징 변수들의 선별과 신경망을 이용하여 향상된 장면 전환점 검출 기법을 제안한다. 기존의 장면 전환점 검출 방식에서는 인접한 프레임 간에 단일 특징과 고정된 임계값을 주로 사용하였다. 하지만, 비디오 시퀀스 내의 장면 전환점에서는 인접한 프레임 간의 내용(content)인 컬러, 모양, 배경 혹은 질감 등이 동시에 변화한다. 따라서 단일 특징보다는 상호 보완 관계를 갖는 강인한 특징을 이용하여 장면 전환점을 효율적으로 검출한다. 본 논문에서 강인한 특징 변수들을 선택하기 위해, 데이터 마이닝 기법 중 대표적인 CART(classification and regression tree)를 이용하고, 다차원 변수에 따른 임계값을 선정하기 위해 역전파 신경망(backpropagation neural net)을 이용한다. 제안한 방식과 대표적인 특징 추출인 PCA(principal component analysis)기법을 비교하여 특징 변수의 추출 성능을 평가한다. 실험 결과에 따라 제안된 방식이 PCA 기법과 비교하여 우수한 성능이 나타남을 확인한다.

• Child Health Nursing Research
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• 제5권1호
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• pp.18-26
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• 1999

The purpose of this study was to explore the late schooler's health concept and health behavior. The research was a descriptive method using a self-report questionaire which include semi open-ended questions. the subjects were 458 late schooler's from 4 to 6 grade. The results were as follows : 1. Perceived health concepts were ‘having no illness’ ‘having normal physical feature and strength’ ‘eating food well’ ‘take exercise’ ‘having a bright mind’ ‘having good interpersonal relationships’‘having strong will’ ‘recovering well’. 2. Perceived health behaviors to maintain health were ‘taking proper exercise’ ‘eating proper food’ ‘maintaining cleanliness’ ‘taking sufficient rest and sleep’ ‘having a vigor life and positive thought’ ‘having good interterpersonal relationships’ ‘receiving health check and immunization’. 3. Health behaviors carried out at present were ‘taking proper exercise’ ‘eating proper food’ ‘having a vigor life and positive thought’ ‘receiving health check an immunization’ ‘taking supplementary drugs’ ‘having a regular life’ ‘maintaining cleanliness’ ‘maintaining warmth’. 4. Perceived causes of illness were ‘taking inproper food’ ‘uncleanliness’ ‘insufficient warmth or environment’ ‘lack of exercise or overexertion’ ‘irregular life habits’ ‘contact with germs’ ‘mental stress’. 5. Perceived treatments of illness were ‘having sufficient rest and sleep’ ‘mental relaxation’ ‘eating food’ ‘ maintinging cleanliness’ ‘ maintaining warmth’ ‘taking supplementary drug’ ‘receiving medical treatment’.

• Design & Manufacturing
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• 제2권4호
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• pp.37-43
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• 2008

Supplementary features in injection molded products, which are boss, rib and snap fit, are mainly located in the products. These features might make molding flow improper in injection processing and consequently give rise to some of molding troubles such as short shot and hesitation. The sink mark on boss parts is generated by the volumetric shrinkage that is caused by both the molding thickness and the closed boss height. The volumetric shrinkage is affected by packing pressure and its amount tends to decrease by increasing the packing pressure. The packing pressure can therefore increase flow rate to a boss part and causes the sink mark depth to increase. As the molding thickness and the closed boss height in the boss part can increase the part volume, these may yield bad solidifying and also extend the molding cycle. In this paper, both the injection molding test and the flow analysis were carried out to investigate the effect of sink marks generated in the boss part of injection molded products.