• Journal of dental hygiene science
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• v.5 no.4
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• pp.221-225
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• 2005

In this study, survey is conducted to make aware of importance which personal protection was accomplished at the dentistry. It investigated the performance of infection control and X-ray safety management to the third grade of D-Health College. 1. The infection control is recognized to high level and practiced certainly at actual training of oral prophylaxis. 2. The infection control is recognized to low level relatively at actual training of radiography. 3. The infection control is not practiced at actual training of radiography except for the film holder. 4. The X-ray safety management is recognized to high level and conducted certainly at actual training of radiography. To consider the above result, the infection control is not nearly practiced at radiography. In accordance with, the education must be demanded that the infection control is practiced throughly at radiography for raising a necessary against the recognization and practice of the infection control.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2015.07a
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• pp.82-84
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• 2015

유한요소법을 이용하여 카페리선 제작 시 축계의 제작 및 강도의 문제를 Campbell Diagram 및 Modal 해석을 통한 동특성 분석을 하였다. 이를 통하여 양방향 차도선의 추진 방향 및 후진 방향 축계 작동 시 공진 현상 및 위험속도를 분석 결과 안정성을 보인 것으로 판단된다.

• Proceedings of the Korean Institute of Intelligent Systems Conference
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• 1995.10b
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• pp.110-117
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• 1995

본 연구는 퍼지모델링을 이용한 고속 소형선의 전체 저항곡선 및 마력곡선을 고속 소형선의 선형요소 자료들로부터 퍼지모델링 알고리즘을 통해 도출하고, 그 결과를 모형시 험 결과와 비교하고 있다. 또한 퍼지모델링 알고리즘에 의한 전체 저항곡선 및 마력곡선이 고속 소형선의 선형요소 결정에 효율적으로 적용됨을 보이고 있다.

• Research in Plant Disease
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• v.20 no.2
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• pp.79-86
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• 2014

In order to seek more eco-friend, economic and safer quarantine method than current methyl bromide fumigation, the convergent treatment with 200 Gy of gamma irradiation and several chemicals such as nano-siver particles (NSS), sodium dichloroisocyanurate (NaDCC) was tried on the cuttings of lily in the packing of catonnage box for export. With 6 independent experiments of gamma irradiation on the three lily cultivars, cvs. Siberia, Le reve and Sorbonne, incidence and severity of lily leaf blight was investigated on leaves and petals at 8-d after infection. 200 Gy of gamma irradiation decreased at 13-25% of severity on the leaf of Sorbonne, but it increased at 2-5% of severity on the leaf of Siberia and Le reve. Chemical substitutes such as NSS and NaDCC were not effective to control of lily blight on cuttings. By 200 Gy of gamma irradiation treatment, chlorophyll contents were statistically significantly decreased at 12-d after irradiation and the longevities vaselife of fully open flower of Siberia and Sorbonne were increased at 0.4 to 1.2 days. In addition, the relative fresh weights of the gamma irradiated cuttings were severely dried compared to the non-irradiated control. On the other hands, the symptoms of phyto-toxicity of high dose gamma irradiation at 1 or 2 kGy on cv. Siberia were to be blight at the tip of bloom, bent necks of flower, and delayed the process of flowering.

• Journal of Navigation and Port Research
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• v.43 no.1
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• pp.72-78
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• 2019

The second-hand ship market provides immediate access to the freight market for shipping investors. When introducing second-hand vessels, the precise estimate of the price is crucial to the decision-making process because it directly affects the burden of capital cost to investors in the future. Previous studies on the second-hand market have mainly focused on the market efficiency. The number of papers on the estimation of second-hand vessel values is very limited. This study proposes an artificial neural network model that has not been attempted in previous studies. Six factors, freight, new-building price, orderbook, scrap price, age and vessel size, that affect the second-hand ship price were identified through literature review. The employed data is 366 real trading records of Panamax second-hand vessels reported to Clarkson between January 2016 and December 2018. Statistical filtering was carried out through correlation analysis and stepwise regression analysis, and three parameters, which are freight, age and size, were selected. Ten-fold cross validation was used to estimate the hyper-parameters of the artificial neural network model. The result of this study confirmed that the performance of the artificial neural network model is better than that of simple stepwise regression analysis. The application of the statistical verification process and artificial neural network model differentiates this paper from others. In addition, it is expected that a scientific model that satisfies both statistical rationality and accuracy of the results will make a contribution to real-life practices.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.26 no.4D
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• pp.679-686
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• 2006

Recently, the city railway in the Seoul Metropolitan Area (SMA) has offered a low quality of service as a passage time, because it was operated slowly. So, the people who live in modern society are not satisfied about passage time, therefore, this study tried to make that the subway in the SMA becomes a more functional and effective wide-area-transportation-network through an express train introduction's method which examined cases from abroad and current system. and then presented how express train could be applied to current system. In a case study, We used the An-San Line and Su-In Line as a examples and developed a schedule which can minimize the delaying time of subway by using Branch & Bound Algorithm. The train operational plan was loaded to consider a railroad siding, Obtained site, and the dispatch interval(three to ten minutes) for the express and local lines and finally, We presented an alternative operational plan which made by those factors.

• Proceedings of the IEEK Conference
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• 2001.09a
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• pp.539-542
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• 2001

본 논문에서는 검출기의 반응 특성을 선형화 모델링 하여 정규화 할 수 있는 방법을 제안한다. 디지털 의료영상 시스템에서 X-선을 검출하는 검출기의 반응 특성이 모든 검출기마다 다르기 때문에 이 특성을 쉽고 빠르게 정규화 하는 방법이 필요하다. 본 논문에서는 균일한 피사체에 X-선 조사량의 비율을 다르게 하여 두 번 찍은 영상으로 검출기의 반응 특성을 정규화 한다. 실험 결과 일정한 두께의 납 평판에 조사량을 달리하여 촬영한 두 개의 결과 영상을 가지고 검출기의 반응 특성을 보정하면 매우 안정된 결과 영상을 얻을 수 있다.

• Tunnel and Underground Space
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• v.9 no.4
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• pp.364-372
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• 1999

In this paper, mechanical characteristics of micro-defects in granitic rock was studied. Crack spacing and length were investigated by scanline survey in specimen of granite. To estimate the direction and distribution of potential microcrack in granite, thin sections were made for three direction of Rift, Grain and Hardway axis of the rock specimen. The density and length of microcrack were investigated quantitatively. Three directions of microcracks are comparatively perpendicular. Crack density varies as direction differs, but crack length doesn't show influence of direction.

• Proceedings of the Korean Association for Survey Research Conference
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• 2001.11a
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• pp.135-147
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• 2001

본 연구는 소비자의 일상생활 행동을 다각적이며 심층적으로 파악하기 위한 하나의 방법으로 다양한 조사방법론을 활용하였다. 본 연구는 디지털 제품 선도 소비자(lead consumer)를 대상으로 구조화된 설문조사법 이외에 심층면접(In Depth-Interview), 쉐도우 서베이(Shadow Survey), 홈비지팅(Home-Visiting) 등의 방법론을 사용하였다. 즉, 일반 소비자와 선도 소비자의 일반적 특성을 파악하기 위해 질문지를 이용한 설문조사방법과 선도 소비자의 일상생활 행동, 행동의 원인, 행동의 결과 등을 심층면접, 쉐도우(Shadow) 관찰조사 방법, 가정 생활을 관찰하기 위한 홈비지팅(Home-visiting) 조사를 실시하였다. 그 결과 의사소통관련 행동은 가족 및 친구를 위한 활동, 정보처리관련 행동은 사회(3차집단)을 위한 활동, 엔터테이먼트 관련 행동은 개인을 위한 활동 목적이 많은 것으로 나타났다. 추후 연구는 상황(Situation)-차이(Gap)-사용(Use)이라는 Sense-Making Theory로 활용되어지며, 이러한 결과는 신상품 컨셉 개발을 위해 활용되어질 것이다. 그러나 본 연구는 견고한 이론적 틀 보다는 목적 지향적이며 실천 지향적 성격이 강하다. 따라서 추후 연구들은 체계적이며, 다학제적인 연구를 통해 조사방법의 체계를 다져야 할 것이다.

• Proceedings of the Korean Nuclear Society Conference
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• 1997.05b
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• pp.350-355
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• 1997

가압중수로(PHWR)형 원자력발전소의 저장수조에 보관중인 사용후핵연료를 대상으로 하는 핵물질 보장조치(safeguards) 이행에 필요한 핵연료다발 수중검증장치를 개발하였다. 본 장치는 CdTe 감마선검출기, 차폐체 및 시준기등으로 구성된 검출부와 이를 지지 및 구동하기 위한 구동부로 구성되어 있다. 검출부에 대하여 감마선 표준선원 및 사용후핵연료 시료를 사용하여 성능시험을 수행한 결과 현장검증시의 요건을 만족하였고, 구동부의 경우 건식조(dry pit)에서 수행한 예비실험 결과 검증목적에 적합하였다. 따라서, PHWR형 원자력발전소인 월성 1 호기의 수중저장조에 있는 사용후CANDU핵연료에 대한 현장성능시험을 현재 준비중에 있으며 그 결과를 바탕으로 하여 국가사찰시에 본 장치를 사용할 예정이며, 향후 IAEA의 공인을 획득하여 IAEA 사찰용 장비로도 활용할 계획이다.