• Tunnel and Underground Space
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• v.10 no.1
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• pp.33-44
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• 2000

In order to investigate the effect of progressive collapse of underground circular opening on surface subsidence, laboratory model tests were performed. The modelling materials were sand which has been used as KS standard. Six test models which had respectively different depths of openings were produced. Surface subsidence and horizontal displacements were measured according to progressive collapse of underground opening. Some subsidence prediction method such as NCB method, profile function method and influence function method were considered to predict the subsidence of sand models. The profile function method approximated by Gaussian error function was finally suggested as the most appropriate to sand models.

• Korean Journal of Optics and Photonics
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• v.17 no.1
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• pp.23-30
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• 2006

Effects of liquid-crystal droplets size on electro-optical properties of the polymer dispersed liquid crystals are investigated experimentally The liquid crystal droplets size was varied by controlling the Laser power for phase separation and LC/oligomer composition ratio. Electro-optical switching voltage is dependent on the LC/oligomer composition ratio and liquid crystal droplet size. The experimental results showed droplet size will be small and saturation voltage is increased but rise time will be short at high power illumination laser light for phase separation.

• Journal of Korean Society of Steel Construction
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• v.16 no.4 s.71
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• pp.471-478
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• 2004

The object of this study is to experimentally investigate the structural behavior of circular tube column bases under axial loads and to ascertain the test results using elastic numerical analysis. A literature survey was conducted on the AISC design code and a few design formulae. Tests were axially conducted under compressive loads. The thickness of the base plate was the main parameter of the specimens. Nine base plate specimens were used, with thicknesses ranging from 9 millimeters to 35 millimeters. The relationship of the load and the vertical displacement of base plates and the relationship of the load and the strain of the base plates were tested. Ansys version 6.1 was used for the elastic numerical analysis, to ascertain the test results. he test results and the elastic numerical analysis results will be used to suggest design formulae for inelastic numerical analyses that will be conducted later on.

• 한국벤처창업학회:학술대회논문집
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• 2017.04a
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• pp.54-54
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• 2017

이 연구의 목적은 온라인 방송으로 신규 창업점포를 광고 또는 임의 노출했을 때, 시청자들에게 미치는 영향을 측정하고 효율적인 광고를 하면서도 창업점포주들의 만족도를 높이기 위한 영향력을 미치는 변인과 효과적인 매체를 분석하고 조사하는데 있다. 이 목적을 달성하기 위하여 온라인 방송의 여러 매체들간 독립변인들과 대조군을 노출시켜, 이로 나타나는 결과 값들을 비교 분석하는 실험연구를 통해, 효과적인 방송 광고 방안을 제시하고자 한다. 매출 상승 효과를 높이기 위해, 방송중 주목, 흥미, 기억, 용인 등의 요인을 적용하여, 긍정적인 분위기로 시청자들의 창업점포를 각인시키고자 한다. 이를 통해, 온라인 방송으로 신규 창업점포를 광고 또는 임의 노출했을 때, 시청자들에게 미치는 영향을 측정하고 효율적인 광고를 하면서도 창업점포주들의 만족도를 높이기 위한 영향력을 미치는 변인과 효과적인 매체를 분석하고 조사하고자 한다. 실험연구 진행방법으로는 매주 금요일 JBS 방송, 페이스북, 유투브에 노출시켜 점포 매출 전*후를 조사하여 온라인 방송이 매출의 영향을 주는지 알아보고자 한다. 또한 매출에 영향이 미친다면 창업학도로서 큰 의미가 될 것으로 보여 논문 연구 진행중으로, 창업컨설턴트들에게 의미있는 연구를 진행할 것이다.

• Food Science of Animal Resources
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• v.22 no.4
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• pp.316-321
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• 2002

Fresh ground pork was irradiated with the electron beam, and the microbiological and oxidative stability of ground pork was examined during refrigerated and frozen storage. During both storage, with the increase in the irradiation dose from 0 to 3.0 kGy, the inhibition effect of the growth of the total aerobic bacteria and the mesophiles also increased. Psychrotrophic bacteria were not detected at all in the whole experiment. On the other hand, electron beam irradiation promoted the oxidative rancidity of ground pork during refrigerated and frozen storage. The catalytic effect of oxidation was more pronounced with the electron beam dose of 3.0 than that of 1.5 kGy. As a result, the control of lipid oxidation must be achieved to fully utilize the sterilization effect of electron beam in the ground pork.

• Radiation Oncology Journal
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• v.10 no.1
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• pp.95-100
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• 1992

Since LINAC-based stereotactic radiosurgery uses multiple noncoplanar arcs, three-dimensional dose evaluation and many beam parameters, a lengthy computation time is required to optimize even the simplest case by a trial and error. The basic approach presented in this paper is to show promising methods using an experimental optimization and an analytic optimization The purpose of this paper is not to describe the detailed methods, but introduce briefly, proceeding research done currently or in near future. A more detailed description will be shown in ongoing published papers. Experimental optimization is based on two approaches. One is shaping the target volumes through the use of multiple isocenters determined from dose experience and testing. The other method is conformal therapy using a beam's eye view technique and field shaping. The analytic approach is to adapt computer-aided design optimization in finding optimum irradiation parameters automatically.

• Proceedings of the KSCN Conference
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• 1999.05a
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• pp.125-125
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• 1999

• The Journal of the Korean dental association
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• v.15 no.10
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• pp.667-670
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• 1977

• Proceedings of the Korea Water Resources Association Conference
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• 1997.05a
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• pp.480-485
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• 1997

• Tunnel and Underground Space
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• v.5 no.3
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• pp.230-239
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• 1995

암석의 인장강도 실험법의 하나로써 새롭게 개발된 Hoop Test에 대한 이론적 뒷받침을 하고자 유한요소법을 사용하여 응력분포를 해석하였다. 간단하며 사용하기 편리한 실험장치이지만 시료가공시 생길 수 있는 내부공의 지름에 대한 오차, 재부공벽면과 하중장치외벽과의 마찰 등이 있어 이들로부터 발생할 오차를 평가해 보았다. 또한 시료의 안지름과 바깥지름의 비율이 응력의 크기에 끼치는 영향을 조사하였다. 응력해석결과, 일반적인 시료준바에 필요한 주의만 기울이면 실험치에 별다른 영향을 주지않는 것으로 제안되었고 이는 그동안의 실험결과의 신뢰성을 이론적으로 보충해 주었다.