• 한국조경학회지
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• 제28권5호
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• pp.87-92
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• 2000

The purpose of this study is to investigate Ozone which we have to contact in our daily lives. Recently Ozone becomes a serious pollutant in the inside and outside. To select th indicator plants or the purifier plants for air pollution caused by ozone, this stud has been conducted with interior landscape plant of 10 species. The results are as follows; 1) The visible demage by Ozone was firstly observed on Viburnum awabuki among 10 species, and it occurred after the lapse of 10, 8 and 4 hours on 0.5, 1.0 and 2.0 ppm ozone treatment, respectively. The first symptom of visible demage appeared on chlorosis or blotting of leaves, then progressed on necrosis of leaves. 2) On the other hand, Litsea japonica and Ardisia japonica were so resistant against Ozone fumigation that they were not demage independently of Ozone concentration till the lapse of 60 hours. 3) Chlorophyll contents were decreased by the increased Ozone concentration. At this time, grana destruction was observed. The most sensitive plant to ozone was Viburnum awabuki, and we suggest that Viburnum awabuki would be possible one to use for the indicator plant. The most resistance plant to Ozone was Litsea japonic and Ardisia japonica, we suggest that Litsea japonica and Ardisia japonica would be possible to use for the purifier plant for Ozone pollution.

• 정보보호학회논문지
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• 제27권5호
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• pp.1189-1199
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• 2017

스마트폰의 보급으로 인하여 문자메세지를 활용하는 스미싱이 급증하고 있으며, 그로 인한 금전적 피해가 크게 증가하고 있다. 본 논문에서는 이러한 피해를 줄이기 위하여, 스미싱 및 스미싱과 관련된 모바일 소액결제에 관련된 제도들의 현황을 살펴본다. 현황 조사 결과 제도적인 노력을 통해서 스미싱 억제는 잘 되고 있지만, 소액결제의 피해는 증가하고 있다는 점을 파악하여 모바일 소액결제 시스템의 보안 강화에 대한 의무 제도의 부재, 소액결제 피해 발생 시 소액결제 참여자(이동통신사, 콘텐츠제공자, 결제대행사) 간 피해보상 주체에 대한 모호성 등과 같은 한계점을 식별하였다. 이러한 한계점을 해결하기 위해서 소액결제 시스템의 보안을 강화하고 의무화 할 수 있도록 소액 결제 사업자에 대한 정보보안 평가제도, 소액결제 피해 발생 시 손해배상 책임자에 대한 구체적 명시 제도 및 법안을 제안한다.

• 전자공학회논문지CI
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• 제47권3호
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• pp.42-50
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• 2010

기존의 선박 USN 관련 시스템은 선박 USN에서 획득한 데이터를 단순히 모니터링 하는 데 그치고 있으므로 해양의 특성을 고려한 지능적인 의사 결정 알고리즘을 갖는 시스템 구현이 필요하다. 본 논문에서는 사례 기반 추론 기법을 이용하여 디지털 선박의 화재, 파손에 관한 사례를 지식 베이스로 구축하고 추론하는 시스템을 설계하였다. 가장 유사한 사례 추천을 위해 KNN 알고리즘을 이용하였고 화재 상황과 파손 상황 사례 베이스를 구축하기 위하여 각 상황별로 3,000 건의 데이터를 입력받아 실험하였다. 실험 결과 화재 사례와 파손 사례에 대한 평균 정확도는 약 82.5%, 80.1%를 나타냈고 유사도 분류 k 개수가 7인 경우에 최적의 수행 결과를 나타냈다. 또한, 추론된 결과를 이용하여 선박 모니터링 시스템을 구현하였다.

• 한국세라믹학회:학술대회논문집
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• 한국세라믹학회 2003년도 춘계총회 및 연구발표회 초록집
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• pp.138.1-138
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• 2003

• 전기저널
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• 11호통권131호
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• pp.15-19
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• 1987

• 한국국방경영분석학회지
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• 제29권2호
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• pp.26-44
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• 2003

This study Is to forecast the damage of smallpox as a biological weapon and to measure the effect of potential responses (quarantine, vaccination and cure) to the spread of smallpox infection when a smallpox bioterrorism attack occurs. We designed the smallpox spreading simulation model through the literature study on a basis of some existing infectious disease models such as SIR, SEIR model by using Vensim program. In order to evaluate the performance of responses to smallpox, we measure the total infection population, infection sustaining duration, average infection rate and the infection spreading behavior of the smallpox. This study can help those who are related to the bioterrorism forecast the present and possible demage, and take more effective actions for minimizing the damage by smallpox bioterrorism.

• Journal of the Korean Data and Information Science Society
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• 제19권2호
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• pp.463-473
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• 2008

In this study, we measure damage depth and calculate effective impact speed in case of rear-end collision using real car insurance data. We study the relationship between demage depth and effective impact speed, and present statistical model for these two variables. In our real data study, 3-degree polynomial equation model is better fit to effective impact speed and demage depth than the simple linear model that are estimated in previous other studies. Damage depth is a major factor to see the extent of impact in a car collision, and by using this equation, it is possible to evaluate the severity of driver's injury.

• 한국조명전기설비학회:학술대회논문집
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• 한국조명전기설비학회 2004년도 학술대회 논문집
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• pp.131-135
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• 2004

The molecules of the substance absorbing a light obtains the radiant energy to the wavelength of the light to make thermal reactions or photochemical reactions. Specially, thermal reactions by infrared radiation brings about physical damage by temperature rise process or temperature drop process of the material. In this study, a measuring system was set up to measure the temperature rise and temperature drop of each sample by infrared radiation from light source. And a physical demage of samples by infrared radiation were measured using the measuring system.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2000년도 추계학술대회 논문집
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• pp.524-527
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• 2000

In this paper, we have studied minimization of the burr which occurred after $\mu$-BGA(ball grid array) singulation process, singulation of the multilayer with a pulsed Nd:YAG(266, 532 nm) laser is used to cut the metal layer which doesn't well absorb laser beam. Especially, the photoresist and $N_2$blowing is effective to minimize of the surface demage and burr. In this experiment, the $N_2$ blowing reduces a laser energy loss by debris and suppress a surface oxidation. The SEM(scanning electron microscopes) and non-contact 3D inspector are used to measure cutting line-width and surface demage. The $\mu$-BGA singulation threshold energy is 75.0 J/cm$^2$at 30 ${\mu}{\textrm}{m}$/s scan speed.

• 한국정밀공학회지
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• 제15권9호
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• pp.145-151
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• 1998

In this study, the experimental and analytic investigation with cold air system has been performed for improving the working environment of the conventional grinding fluid. Very simple cold air system was developed which could replace by the conventional grinding fluid system. The identification of heat of grinding Bone is very important for precision grinding. The experimental data was analysed to investigate the heat which was transferred to the workpiece. It was found that 45∼55％ of the total energy for dry grinding, 22∼28％ for wet grinding, and 32∼35％ for cold air system are conducted to the workpiece in grinding with cubic boron nitride wheel. Cubic boron nitride wheel could reduce the residual stress and thermal demage comparing with aluminium oxide wheel, because cubic boron nitride wheel has very high extreme thermal conductivity.