• Journal of Korean Dental Science
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• 제10권2호
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• pp.53-59
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• 2017

Purpose: The objective of the present article is to determine whether there are differences in vertical enlargement ratio among various sites within both jaws in a panoramic radiograph. Materials and Methods: Two hundred and seventy-threeimplant sites in panoramic radiographs were evaluated by two observers. Magnification ratios at various sites in both jaws were calculated and compared with each other. Result: The average vertical enlargement ratio in the panoramic radiograph was 1.264 and this value was larger than original ratio 1.250. Although vertical magnification ratio of maxillary molar area was higher than that of mandibular molar area, every group showed similar magnification ratio in clinical respect. Conclusion: Vertical magnification ratio of the maxillary molar area is statistically higher than that of the mandibular molar area in the panoramic radiograph, but it is clinically negligible.

• 대한의용생체공학회:학술대회논문집
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• 대한의용생체공학회 1989년도 춘계학술대회
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• pp.23-26
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• 1989

This paper describes the automatic recognition technique for heart enlargement diagnosis with the chest X-ray films enhanced by digital image processing. The technique measures a maximum transverse of the daiphragm and a maximum transverse of the heart by means of direction signature algorithms, then calculates the desired ratio of these two measured values. This is often refered to a cadiothoracic ratio which gives as useful clue for heart enlargement symptom. The experiment results in this paper show presented method is more efficient than the manual diagnosis method of the symptom.

• 한국구조물진단유지관리공학회 논문집
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• 제27권5호
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• pp.139-146
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• 2023

In this study, compressive strength and adhesion strength were measured as repair materials to evaluate the mechanical and electrical properties of compression and shear specimens with self-sensing repair materials. As a result of the experiment, the strength improvement rate of the compression test specimen was higher than the section enlargement area ratio, but the shear test specimen did not show an improvement in strength as much as the section enlargement area ratio. Compression experiments under load showed high correlation between FCR-Strain and FCR-Stress, confirming self-sensing performance. However, the shear test did not show as much correlation as the compression test. Accordingly, it is judged that the self-sensing repair material is suitable for the compression member on which the compression load acts in the building.

• 한국추진공학회:학술대회논문집
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• 한국추진공학회 1997년도 제8회 학술강연회논문집
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• pp.235-244
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• 1997

The empirical factor and reaction force based on published data were involved to investigate compressible flows through sudden enlargement and sudden contraction passages. Analytical solutions of engineering interest were obtained from one-dimensional steady compressible gas dynamic equations. The effects of compressibility, cross-sectional area ratio, and inlet Mach number on the air flows were discussed with regards to the total pressure loss and flow choking. The present results provide available information necessary ta design the compressible pipe flow systems.

• 생물환경조절학회지
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• 제16권1호
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• pp.47-53
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• 2007

본 실험은 고품질의 콩나물 생산을 위한 기초연구로서 식물생장조절제를 이용한 세근발생 억제 및 하배축비대촉진을 위한 처리 방법을 구명하고자 실험을 수행하여 다음과 같은 결과를 얻었다. 식물생장조절제 중 $GA_3$나 NAA 처리는 세근발생 억제효과가 미약하였다. 반면 BAP처이믐 세근발생이 전혀 일어나지 않았고 하배축의 비대를 촉진하였는데, 저농도인 $10mg{\cdot}L^{-1}$ 및 $15mg{\cdot}L^{-1}$ 처리에서도 그 효과가 인정되었다. BAP의 처리시간은 짧을수록 하배축 비대가 촉진되었고 하배축 비대를 촉진하는 처리시간은 6시간 처리였다. BAP 처리 후 24시간 간격으로 관수는 세근 발생율이 낮았고 하배축 비대는 촉진되었다. 인돌비는 적정농도로 알려져 있는 4.2%보다 낮은 농도인 1.1%용액을 처리하더라도 세근 발생이 크게 문제되지 않았다.

• 대한인간공학회지
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• 제36권4호
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• pp.305-323
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• 2017

Objective: The purpose of this study was to determine breast shape and ratio of breast enlargement women prior to development of breast enlargement patient's bra. Background: Although there are many previous studies on women's breast that did not undergo breast augmentation surgery, no studies have examined the breast type and proportion of women with breast augmentation. Method: In this study, we analyzed ratios and angles with photographs taken before and after breast augmentation on the frontal and lateral views of the breast, UPF and projection were analyzed too. We also compared the pre-operative and post-operative rates with those of previous breast studies, as well as the post-operative breast types for the desirable breast types. Results: The length and width of the breast base and the height of the breast projection increased after the operation. The rate of increase in width is larger than the vertical distance in the breast base, and the rate of increase in height of the projection is larger than the increase in the width. Specifically, in the vertical distance, the rate of increase in the lower portion is larger than that in the upper portion. In the width, the rate of increase on the inside is larger than that on the outside. Conclusion: The angles of the static relationship with the projection increased and the angles of the minor relation decreased. The changes in the size of the breast were visually observed in the overlapping of the triangle shape before and after the surgery. The changes were composed of the line connecting the angle and the measurement points. The pre-operative upper pole fullness (UPF) was mostly 0 and - 1, but after the surgery, +1, 0, -1, +2 were distributed, while post-operative levels of projection were distributed in the order of level 3> level 1> level 2. In comparison with the desirable breast type, it was found that the anatomical type was a more natural breast type than the round type of implant. Application: These results can be useful as basic data for the breast analysis of breast enlargement patients and their bra patterns.

• 한국건설순환자원학회논문집
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• 제7권3호
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• pp.235-242
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• 2019

이 연구의 목적은 단면확대 보강을 위해 개발된 폴리머와 초속경 시멘트를 혼입한 콘크리트의 자기 충전성 확보를 위한 배합상세 수정이다. 보강용 콘크리트의 자기충전성은 일본토목학회(JSCE 1999)와 유럽통합기준(EFNARC 2002)에서 제시된 자기충전 콘크리트의 굳기 전 물성시험 및 성능기준을 통해 평가하였다. 실험결과, 동일한 물-결합재 비에서 단위 결합재양을 증가(페이스트 부피비 증가)시키면, 점성이 증가 하지만, 단위수량도 증가하여 점성에 의한 유동성 저하는 없었다. 단면확대 보강용 콘크리트를 위해 개발된 결합재를 이용한 일반강도 콘크리트 배합 시 자기다짐 성능을 확보하기 위한 배합조건은 물-결합재비 38%에서 단위결합재양은 $430kg/m^3{\sim}470kg/m^3$, 잔골재율은 40%~46% 수준이 추천될 수 있었다.

• 한국추진공학회:학술대회논문집
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• 한국추진공학회 2011년도 제36회 춘계학술대회논문집
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• pp.193-195
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• 2011

An abrupt increase of duct cross-section is frequently encountered in pressure reducing devices, valves of internal combustion engines and in gas pipelines. Supersonic flow in a rectangular duct passing an abrupt increase of cross-section is studied numerically. The behavior of base pressure of the dead-air region at sudden enlargement of the duct is clarified. This investigation concerns the determination of the base pressure, which is independent of the size of the enlarged part. Several flow patterns are identified with different enlargements according to the ratio between the downstream ambient pressure and the upstream reservoir pressure. Base pressure and the resulting shock-structure are highly depending on the size of duct enlargement. For a given duct, base pressure tends to minimum for a particular pressure ratio. In addition, the locations of secondary separation and reattachment points of the jet plume are found with respect to different duct enlargements.

• 대한소아치과학회지
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• 제28권1호
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• pp.185-194
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• 2001

측두 규격방사전사진 촬영시 피사체의 정중시상면과 필름의 평행관계가 유지된 상태에서 피사체의 수직회전 그리고 피사체의 정중시상면과 필름의 평행이 이루어지지 않는 피사체의 수평회전에 따른 확대율의 변화를 평가하고자 하였다. 이를 위하여 수직회전 및 수평회전을 정밀하게 재현할 수 있는 입체적 기구를 제작하여 측두 규격방사선사진을 촬영한 후, 현상된 필름 상에서 선계측치 및 각도계측치에서의 확대율, 그리고 피사체의 정중시상면을 중심으로 한 좌우 대칭적인 해부학적 구조물 간의 거리차에 의한 확대율의 차이를 비교하였다. 그 결과, 측두 규격방사선사진을 촬영시 피사체의 정중시상면과 필름의 평행관계가 유지된 상태에서 두부 고정장치의 양측 귀꽂이를 중심축으로 한 수직회전은 모든 계측치의 확대율에 영향을 미치지 않으나, 정중시상면의 수평회전이 커질수록 수평계측치에서는 대체로 확대율의 감소가 커지는 반면. 필름 우측의 수직계측치에서는 확대율의 점진적인 증가가, 좌측의 수직계측치에서는 확대율의 점진적인 감소가 나타나며, 동일한 회전량일 때 수직계측치에서보다 수평계측치에서 대체로 더 큰 차이가 나타나 측두 규격방사선사진의 촬영 시에는 피사체의 정중시상면과 필름과의 평행관계 유지의 중요성과 함께 피사체의 수평회전의 정도에 따른 필름의 부위별 확대율 변화의 유형을 숙지해야 할 것으로 가늠된다.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2005년도 춘계 학술기술논문발표대회 논문집
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• pp.93-98
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• 2005

The purpose of this study was to analyze the compression strength research by aerated concrete as mixing ratio This Study used foaming-agent and produced aerated concrete by pre-foam way that is used in construction site. An experiment changes unit cement amount, w/c and the glass fiber mixing rate and 'measured capacity change, unit capacity weight and compressive strength. The results obtained from experimental study are as following; Research to reduce unit capacity weight in condition more than unit cement amount 500kgf is considered should be gone side by side. The highest compressive strength result appeared in aerated concrete that cement amount 600kgf and w/c ratio $45\%$, $50\%$. compressive strength was increased maximum $34%$ when glass fiber $0.7\%$ addition cause by coherence enlargement to enlargement of cement paste and glass fiber addition per unit volume