• 한국공작기계학회논문집
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• 제14권1호
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• pp.73-80
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• 2005

Injection molding is the most widely used process for the industrial forming of plastic articles. During an injection molding process of composites, the fiber-matrix separation and fiber orientation are caused by the flow of molten polymer/fiber mixture. As a result, the product tends to be nonhomogeneous and anisotropic. Hence, it is very important to clarify the relations between separation orientation and injection molding conditions. So far, there is no research on the measurement of fiber orientation using image processing. In this study, the effects of fiber content ratio and molding condition on the fiber orientation-angle distributions are studied experimentally. Using the image processing method, the fiber orientation distribution of welding parts in injection-molded products is assessed. And the effects of fiber content and injection mold shapes on the fiber orientation in case of fiber reinforced polymeric composites are studied experimentally.

• 한국공작기계학회논문집
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• 제15권4호
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• pp.1-7
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• 2006

Injection molding is a very important industrial process for the manufacturing of plastics objects. During an injection molding process of composites, the fiber-matrix separation and fiber orientation are caused by the flow of molten polymer/fiber mixture. As a result, the product tends to be nonhomogeneous and anisotropic. Hence, it is very important to clarify the relations between separation orientation and injection molding conditions. So far, there is no research on the measurement of fiber orientation using image processing. In this study, the effects of fiber content ratio and molding condition on the fiber orientation-angle distributions are studied experimentally. Using the image processing method, the fiber orientation distribution of weld-line in injection-molded products is assessed. And the effects of fiber content and injection mold-gate conditions on the fiber orientation are also discussed.

• 한국복합재료학회:학술대회논문집
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• 한국복합재료학회 2000년도 추계학술발표대회 논문집
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• pp.265-270
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• 2000

Injection molding is a very important industrial process for the manufacturing of plastics objects. During an injection molding process of composites, the fiber-matrix separation and fiber orientation are caused by the flow of molten polymer/fiber mixture. As a result, the product tends to be nonhomogeneous and anisotropic. Hence, it is very important to clarify the relations between separation· orientation and injection molding conditions. So far, there is no research on the measurement of fiber orientation using image processing. In this study, the effects of fiber content ratio and molding condition on the fiber orientation-angle distributions are studied experimentally. Using the image processing method, the fiber orientation distribution of weld-line parts in injection-molded products is assessed. And the effects of fiber content and injection molding conditions on the fiber orientation functions are also discussed

• 충청수학회지
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• 제17권2호
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• pp.163-167
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• 2004

In this paper, we obtain some coefficient estimates of harmonic, orientation-preserving, univalent mappings defined on ${\Delta}$ = {z : |z| > 1}.

• 전자공학회논문지SC
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• 제41권4호
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• pp.39-43
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• 2004

능동적인 비전 시스템의 전형적인 한 테마는 카메라의 시선 고정 문제이다. 여기서 카메라의 시선 고정이란 동적인 물체 상의 지정된 한 점이 항시 이미지의 중앙부에 놓이도록 카메라의 자세를 조정하는 것으로서, 이를 위해서는 카메라에 비친 영상정보를 분석하는 기능과 카메라의 자세를 제어하는 두 가지 기능이 결합되어야 한다. 본 논문에서는 영상분석과 자세제어가 한 개의 프레임 하에서 설계되는 카메라의 시선 고정을 위한 알고리즘을 제안한다. 이 때 제작시의 어려움을 피하고 실시간 응용을 위해서 본 알고리즘은 카메라의 calibration이나 3차원 거리 정보의 복원을 필요로 하지 않도록, 그리고 닫힌 형태(closed-form)가 되도록 설계된다.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 1996년도 춘계학술대회 논문집
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• pp.556-560
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• 1996

In order to examine thd accuracy of intersection counting method, the fiber orientation distribution of simulation figure platted by PC is measured using image processing. The fiber orientation distribution obtained by an image processing method is compared with those by the intersection counting method. The result shows that the errors of the intersection counting method are large because its measurement is made by the cross point of the scanning line and the fiber.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2006년도 하계학술대회 논문집 Vol.7
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• pp.46-46
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• 2006

$SrTiO_3$ was annealed at two different annealing times (1 h and 16 h) to investigate the annealing effect on the grain size and orientation distribution. Electron backscattered diffraction (EBSD) was used to analyze the grain size and grain orientation distributions of the $SrTiO_3$. It is possible to understand the annealing effect on the microstructure evolution, by comparing the grain size and orientation distribution of the $SrTiO_3$ as a function of annealing time.

• 한국콘텐츠학회논문지
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• 제19권5호
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• pp.404-416
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• 2019

본 연구는 슈퍼비전의 실행과정과 슈퍼비전의 기능이 사회복지사의 슈퍼비전 만족과 고객지향성에 미치는 영향을 파악하기 위한 목적으로 수행되었으며, 분석은 구조방정식 모형을 이용하여 변인들 간의 경로를 파악하였다. 경상도 지역의 사회복지사 196명의 응답을 분석한 결과, 슈퍼비전 실행과정은 슈퍼비전 만족에 직접적인 영향을 미쳤으나 고객지향성에는 영향을 미치지 않았고, 슈퍼비전 기능은 슈퍼비전 만족과 고객지향성 모두에 직접적인 영향을 미쳤다. 또한 슈퍼비전 실행과정과 기능은 슈퍼비전 만족을 매개로하여 고객지향성에 영향을 미치는 것으로 나타났다. 본 연구는 클라이언트에게 고객지향적인 서비스를 제공하기 위한 방안으로 슈퍼비전의 실행체계를 고려하였다는 점에 의의가 있다.

• 기본간호학회지
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• 제9권3호
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• pp.424-433
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• 2002

This study was done to compare death orientation scores for student nurses before and after studying a major. The participants were 130 student nurses before the major and 123 student nurses after the major at C university in Kwang Ju city. The data were gathered from March, 1998 to September, 2001 using a questionnaire. The data were analysed by Chi square test, t-test, ANOVA and Pearson correlation coefficients. The results of this study are summarized as follows ; 1 The mean scores for death orientation before and after the major were 57.8 and 60.2 respectively. The mean score of death orientation after the major tended to be higher than before but they were not significantly different. 2. There were significant differences in death orientation scores between the two groups before the major for 'physical function (F=3.83, p=.023)' and 'attending a lecture on spiritual nursing (F=2.58, p=.010)'. After the major there were significant difference for 'feeling of health (F=4.76, p= .001)'. 3. The death orientation scores before the major showed an inverse correlation with religiosity score (r=-.239, p=.006). After the major there was no correlation with religion.

• Journal of Welding and Joining
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• 제26권2호
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• pp.62-68
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• 2008

Effects of gravitational orientation on gas tungsten arc welding (GTAW) for 304 stainless steel were studied to determine the critical factors for weld pool formation, such as weld surface deformation and weld pool shape. This study was accomplished through an analytical study of weld pool stability as a function of primary welding parameters (arc current and arc holding time), material properties (surface tension and density), and melting efficiency (cross-sectional area). The stability of weld pool shape and weld surface deformation was confirmed experimentally by changing the welding position. The arc current and translational velocity were the major factors in determining the weld pool stability as a function of the gravitational orientation. A 200A spot GTAW showed a significant variation of the weld pool formation as the arc held longer than 3 seconds, however the weld pool shape and surface morphology for a 165A spot GTAW were 'stable', i.e., constant regardless of the gravitational orientation. The cross-sectional area of the weld (CSA) was one of the critical factors in determining the weld pool stability. The measured CSA ($13.5mm^2$) for the 200A spot GTAW showed a good agreement with the calculated CSA ($14.9mm^2$).