• 한국기계가공학회지
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• 제17권4호
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• pp.123-129
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• 2018

A rotational drawing die which can form a long tube with spiral grooves on the surface is presented. The main feature of the proposed die is a rotation insert that is embedded into the die container for the die to freely rotate with respect to the drawing centerline as the materials are drawn. We employed a three-dimensional finite element model to investigate the effects of the rotational die on the material filling of spiral grooves. The material used in the finite element analysis was stainless 304. We also performed a pilot drawing test to verify the usefulness of the proposed rotational drawing die. Results reveal that the material filling of spiral grooves by the proposed rotational drawing die was in good agreement for both the finite element analysis and the drawing test. We found that the underfill in a conventional drawing die was reduced in the proposed rotational drawing die.

• 한국기계가공학회지
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• 제7권4호
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• pp.62-67
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• 2008

In this research, we developed a pilot wire-drawing machine as well as wire end-pointing roller. Using these machines, we performed a pilot wire-drawing test at different coating material and lubricant when the reduction ratio is 10 %. To inversely compute the friction coefficient between the coating layer of wire and the surface of die for a specific lubricant, we carried out a series of three dimensional finite element analysis. Results show that the drawing force is varied with the coating material of wire at the same reduction ratio and lubricant. It is noted that the frictional coefficient in drawing is dependent on the coupled property of coating material and lubricant, indicating the best coating material for a given lubricant.

• 동의신경정신과학회지
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• 제12권2호
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• pp.185-191
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• 2001

Objectives: This study aimed to evaluate the usefulness as a screening test of Clock Drawing Test(CDT) compared with the standard K-DRS in probably dementia. Methods: The subjects for this study consisted of 19 elderly persons who visited to the outpatient department of Oriental Neuropsychiatry of the Kyunghee Oriental hospital. They received the K-DRS and the Clock Drawing Test. Three observers evaluated them with circle, numbers, hands. Inter-rater reliability of scores from Clock Drawing Test was assessed and Pearson correlation coefficients were used to examined the relationships between scores from Clock Drawing Test and K-DRS. Results: Correlations between individual raters was highly significant (r= .957, .974, and .970, respectively: p<.001). There was stastically significant correlations between K-DRS and CDT scores (r= 0.849, p<.001). Conclusions: The CDT can be rated reliably by observers and correlations between CDT and K-DRS is significantly high. We confirmed the usefulness of CDT as simple, easily administered, low cost, and reliable general screening test for dementia.

• 대한소아치과학회지
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• 제24권1호
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• pp.235-246
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• 1997

This study was done as a pilot study to develop a color test measuring children's dental anxiety. The subjects of study were 511 preschool children aged from 3 to 6. Caries experience was examined. Children's drawings of the dentist were collected and analyzed by the method of human figure drawing test modified by Sonnenberg and Venham. Colors of high dental anxiety level were black, brown, purple, red, yellow, pink, green, orange, blue, gray, yellow ochre, and white in that order. Colors of high frequency of use were yellow ochre, green, blue, red, orange, pink, black & purple, yellow, brown, gray, and white in that order. As the age increased, white & gray, yellow ochre, and blue increased and black, purple, and pink decreased. Boys liked green and blue, and girls liked orange and yellow. Filled teeth rate was highest in yellow ochre group and very low in black group. Children who had an educational dental visit before the test used green color more than the rest of children.

• 한국건설관리학회논문집
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• 제17권3호
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• pp.98-107
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• 2016

건설 프로젝트에서 정보관리 시스템은 도면, 문서관리, 행정처리 위주로 사용되고 있으며, 실시간 의사소통 및 참여자간의 의사전달 관리를 지원하는데는 한계가 있다. 본 연구에서는 다양한 커뮤니케이션 방식과 콘텐츠를 지원하는 플랫폼 비즈니스 시대에 맞추어 프로젝트 참여자간 의사전달 관리를 지원하는 협업 플랫폼을 개발함으로써 효과적인 의사소통, 정보공유 및 업무관리 효율화에 기여하고자 한다. 도면 및 문서관리 또는 행정업무 중심으로 사용되는 기존 프로젝트 또는 사업관리 시스템에서 벗어나 프로젝트 참여자간 커뮤니케이션 및 협업과 관련된 일련의 활동을 지원하는 협업 플랫폼(CCP)을 개발하는 것이 본 연구의 목적이다. 본 연구에서 개발된 CCP는 설문조사를 통해 협업 플랫폼 사용에 따른 효과가 검증되었으며, 기존 커뮤니케이션 또는 협업 방식에 비해 정보공유 및 배포, 기록 및 추적관리가 용이하며, 자신의 업무능력 향상에 기여한 것으로 나타났다.