TiO₂/SiO₂ 박막 코팅에 의한 폴리카보네이트 특성 개선

원동수,이원규,Won, Dong So,Lee, Won Gyu 한국공업화학회 2014 공업화학 Vol.25 No.1

폴리카보네이트의 표면에 무기계 $SiO_2$ 박막을 바인더로 코팅한 후 광촉매 특성을 갖는 $TiO_2$ 박막을 추가로 형성하여 모재의 특성을 향상시키는 연구가 수행되었다. 바인더로 사용되는 $SiO_2$ 박막은 광투과 특성이 우수하며, 상압플라즈마처리를 통한 친수성의 증가로 $TiO_2$ 함유 수용액의 도포성을 향상시켜 균일한 박막을 형성시킬 수 있었다. 약 200 nm이상으로 코팅된 $TiO_2$ 박막은 180~400 nm의 자외선을 차단하여 폴리카보네이트의 황변현상을 억제하고 내열성을 크게 향상하는데 기여하였다. 최외층에 형성된 $TiO_2$ 박막은 자외선의 흡수로 활성화되는 표면산화특성으로 유기 오염물의 분해반응 촉진과 표면의 친수성의 증가에 따른 자기세정특성을 나타내었다. $TiO_2$ 박막과 폴리카보네이트 기재 사이에 $SiO_2$ 박막의 적용은 기재의 부식에 의한 코팅된 $TiO_2$ 층의 박리를 억제하여 구조 안정성을 유지할 수 있었다. The property improvement of polycarbonate coated with a multilayer film composed of an inorganic $SiO_2$ film and a photocatalytic $TiO_2$ film was studied. The $SiO_2$ film as a binder had an excellent light transmission characteristic. After the treatment with atmospheric pressure plasma, the surface of $SiO_2$ film showed the hydrophilicity, which increased the film coating uniformity with a $TiO_2$-containing aqueous solution. When $TiO_2$ film was over 200 nm thick, the absorption effect of UV rays in the range of 180~400 nm suppressed the yellowing phenomena of polycarbonate substrate. The inorganic film improved the heat resistance of polycarbonate substrates. $TiO_2$ film in the outmost under the exposure of UV rays promotes the catalytic oxidation characteristics and yields the capability to the decomposition of organic contaminants, and also increases the self-cleaning properties due to the increase of hydrophilicity. Structural stability of the polycarbonate substrate coated with inorganic $TiO_2$ and $SiO_2$ film was shown. The role of $SiO_2$ film between $TiO_2$ and polycarbonate substrate suppressed the peeling of $TiO_2$ film by inhibiting the photocatalytic oxidation effect of $TiO_2$ film on the polycarbonate substrate.

신장 이식을 위한 HLA 교차시험에서 전혈 유세포분석법의 실험적 적용

원동일 대한진단검사의학회 2006 Annals of Laboratory Medicine Vol.26 No.1

서론 : 신장 이식을 위한 유세포분석법에 의한 HLA 교차시험(flow cytometry crossmatch, FCXM)에서 공여자 말초혈액에서 분리한 림프구가 사용된다. 본 연구에서는 FCXM에서 림프구분리 과정 없이 전혈을 이용하는 방법을 시도하여 보았다.방법 : 신장이식을 위한 T 세포 FCXM에서 20예(양성 5예 포함)를 대상으로, 단핵구를 분리하여 검사하는 방법(표준법)을 기준으로 전혈을 이용한 두 가지 변법을 비교하였다. 전혈을 이용하는 경우, 공여자 전혈과 과량의 수여자 혈청을 반응시킨 후 적혈구를 용혈(전혈용혈법)시키거나, 용혈시키지 않고 fluorescencesignal triggering 기법으로 T 세포의 신호를 수집(전혈법)하였다.결과 판정을 위하여 시험 혈청의 측정치를 음성 대조로 나눈 값,즉 평균형광강도비(MFI ratio)를 구하였다.결과 :표준법, 전혈용혈법, 전혈법에 의한 20예의 MFI 비는 각각 4.9±8.1, 5.4±9.7, 4.8±7.8로, 전혈용혈법과 전혈법 둘 다 표준법과 비교하여 유의한 차이가 없었다(각 P=0.313, 0.831, pa-ired t-test). 정성 판정은 1예를 제외한 모든 예에서 일치하였다.불일치한 1예는 전혈용혈법에서만 MFI 비 2.2의 약양성이었다.

군집 저궤도 위성의 통신제약조건을 고려한 분산 베이지안 학습 기반의 정보 융합

원동식(Dongshik Won),이헌철(Heoncheol Lee),한명훈(Myoung-hun Han) 한국항공우주학회 2023 한국항공우주학회 학술발표회 논문집 Vol.2023 No.4

구미제국을 다녀와서 ( 2 )

원동진 대한지방행정공제회 1971 地方行政 Vol.20 No.208

항응고제 비의존성 응집소에 의한 위혈소판감소증

원동일,권오건,윤갑준 대한임상병리학회 1999 대한임상병리학회지 Vol.19 No.6

환경정책권과 재산권

원동철(Dongchul Won) 한국경제연구원 1998 한국경제연구원 연구보고서 Vol.1998 No.-

The primary role of the government for the market economy lies in establishing the system of property rights and administering it in an efficient way. Environmental issues may not be exceptional in that the rights to the environment can be set up. The Constitution of our country specifies that people have the right to live in a healthy and clean environment. This is one of the most natural rights for life People cannot live without consuming environmental resources like the air and water. Thus the Constitution gives people the right to use the environment directly for life. On the other hand, Environmental Law allows firms to emit pollution to the environment to the degree that legal emission standards are not violated. The Law gives people the right to pollute the environment in producing means of living like goods and services. This right is concerned about the way in which the environment is used indirectly for life. Both rights are indispensable for human life. The forner can be considered the environmental right and the latter the emission right. Conflicts between the two rights have been aggravated as industrial production is expanded. Social dissatisfaction with environmental qualities seems to worsen in the face of stricter environmental regulations and increased expenditures for pollution abatement. It means that environmental problem is not properly managed. There may be several reasons for environmental mismanagement. First of all, environmental standards might be too loose compared to environmental amenity the society wants to live with. Second, even if the standards are properly set, they might be implemented inefficiently or inappropriately. Those issues are related to the establishment of property rights to the environment. Specirically, we need to check that environmental standards are suitable to balance environmental rights against emission rights and that these rights are protected and traded as efficiently as possible. The goal of the paper is to propose an alternative approach to the environmental problem of our country from the perspective of the theory of property rights based upon the review of environmental realities and on the evaluation of policy instruments. We emphasize that property rights can be effective in dealing with environmental issues which allows the government to play its primary role of protecting and monitoring the rights to the environment and that the market principle must be adopted in allocating externalities which deserves property rights. It is a matter of convention to take for granted the intervention in exercising emission rights and to think enforcing a special type of soap in the bathroom as a violation of the human right to have clean life. To attain our goal, performance of environmental policy is evaluated by analyzing environmental statistics about water and air qualities With reference to environmental standards and comparing pollution abatement expenditures With those of the OECD countries. To figure out how people feels about the current quality of the environment, a survey about social consciousness of the environmental problem is discussed Coase. Theorem is applied to the allocation of property rights to the environment. We emphasize the impact of transaction costs on assigning property rights to externalities Liability rule takes an advantage over property rule in cases that voluntary transactions are not feasible. Environmental policy instruments are compared within those theoretical framework. We argue that the market principle must be adopted where it can work. To illustrate how marketbased policies work, we take a case study of water pollution issues of Nakdong River renewed by building Uycheon lndustrial District.

중증의 저역가 한랭혈구응집질환 1예

원동일,권오건,윤갑준,김황민 대한임상병리학회 2000 대한임상병리학회지 Vol.20 No.1

새시대의 교육

원동연 연세대학교 신과대학·연합신학대학원 2000 연세대학교 연신원 목회자 하기 신학세미나 강의집 Vol.- No.20

7년전, 본인의 자녀가 중학생일 때 일인데, 무엇이 될 것인지에 대해서 질문을 했다. 그러자 아들은 되고 싶은 것이 없고, 되지 않고 싶은 사람은 있는데, 그것이 바로 아빠같은 사람이라고 말했다. 그때, 나는 우리 교육이 가지고 있는 아픔 두가지를 발견하게 되었다. 첫째는, 성적과 실력의 괴리이다. 영어 성적은 높지만, 영어를 잘 하지 못하고 역사 성적은 높지만, 역사의식을 가진 사람은 없다. 이것이 우리 교육의 가장 큰 약점이다. 이것은 개인의 문제가 아니다. 우리나라가 경제규모는 10위 내외이지만, 국가 경쟁력은 30-40위를 오르내린다. 이처럼 우리나라에는 개인이건 집단이건 실력과 성적에 엄청난 괴리를 갖고 있는 것이다. 그리고 이것 보다 더 심각한 문제는, 성적이 떨어지면, 실력을 쌓을 기회를 박탈당한다는 것이다. 이런 구조적인 모순에서 우리 나라의 모든 사람들이 열병을 앓고 있는 것이 사실이다.

Digital 增幅器와 減衰器 에 관한 硏究

元東豪 成均館大學校 科學技術硏究所 1983 論文集 Vol.34 No.1

In this paper, by using elastic store, a digital amplifier and a digital attenuator with 1 dB step which, no conversion to analog, are composed of shift registers, full adders and full subtracters were introduced and their characteristics have been studied. In case of the digital amplifier, the experimental results indicated that the large gain and the large input signal make it reduce nonlinearity due to Quantization and shift

Equilibrium in Constrained Financial Markets

원동철,한광석 한국계량경제학회 2020 계량경제학보 Vol.31 No.4

Redundant assets give rise to peculiar portfolios, called `link portfolios,' under portfolio constraints. Link portfolios are jointly spanned by constrained null-income portfolios and form a linear subspace. The paper provides a general methodology for showing the existence of equilibrium under portfolio constraints by building two theoretical pillars to deal with link portfolios. The two pillars consist of the fundamental theorem of portfolio decomposition and the allocational equivalence between the original economy and the artificial economy built from projecting away link portfolios from the portfolio constraints. Investigating the existence of equilibrium in constrained financial markets boils down to finding a sufficient condition for the fundamental theorem of portfolio constraints to hold. The sufficient condition of the paper is general enough to encompass other sufficient conditions of the literature.