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이영환,이완하,지웅길,김상린 한국약제학회 1985 Journal of Pharmaceutical Investigation Vol.15 No.2
Pivampicillin hydrochloride is a kind of broad spectrum antibiotics with bactericidal action, and is used in many countries, although it has bitter taste, unpleasant odour and side effects of irritating gastric mucosa, nausea, penicillin allergy, etc. For the improvement of such side effects of pivampicillin hydrochloride, microcapsules, with wall of ethylcellulose, have been prepared by coacervation method. The shape was observed through the scanning electron microscope, the release of the drug into an aqueous medium was studied and the effects of core: ethylcellulose ratio were interpreted as well as making sensory evaluation of taste and odour. There was decreasing trend in dissolution rate of the drug with the increase of core: ethylcellulose ratios, and the smaller microcapsules released their contents more rapidly. A linear relationship was established between the amount of ethylcellulose and the time for 60% release of the drug, and the release pattern was found to have similar characteristics to the release of the drug from an insoluble porous matrix. The release of the drug in the artificial intestinal fluids (pH 6.8) was found to be similar to that in water, while the release in the artificial gastric juice (pH 1.2) was slightly slower. Bioavailability of microcapsule was compared with that of pivampicillin hydrochloride in rabbits using serum concentration and urinary excretion measurements. Microcapsule gave showed slightly higher serum level than pivampicillin hydrochloride from 2 hours after administration, while no significant difference was observed in the accumulated urinary excretion rate between pivampicillin hydrochloride and microcapsule. The ulcer index of pivampicillin hydrochloride administered group was 2.6, and microcapsule administered group was 1.5, while control group was 0.8. Therefore it may be concluded that microencapsulation of pivampicillin hydrochloride is a useful pharmaceutical approach to protect the gastrointestinal tract from being injured by direct contact of pivampicillin hydrochloride without any significant difference of bioavailability.
李英煥 서울大學校 保健大學院 1978 보건학논집 Vol.15 No.1
In order to grasp the growth of aging population, which is the population above 65 years old, population data from 1925 to 1990 were used. Tables show the relationship among age structure coefficient, aging population index and aging dependent population index by year and area, and also show aging population density by area. Results obtained are as follows: 1. The aging population of 1.2 billion as of 1975 will be over 2million after 1990. 2. Aging index of 9.14% will be 17.87% in 1990 which is almost double. 3. Aging dependent population index by area varies from 3.0% (Seoul or Pusan) to 10.1% (Jeju). 4. Aging population density of 12.21 will be 22.12 in 1990. which is almost double. 5. Compared Korea's various indices with the ones of the advanced countries, Korea will be reached to the aging of the present advanced countries after 15 or 20 years.
李英煥 서울大學校保建大學院 1977 보건학논집 Vol.14 No.2
C. Gini, the Italian demographer, defined fecundability as the monthly Probability of Concepton in the absence of contraception, outside the gestation period and the temporary sterile period following the temination of a pregnancy. Durng the past few decades demographers have estimated it by using the fitting of a theoretical model such as the Type 1 geometric model, to the observed distribution of conceptive delays of women not practising contraception. The two purposes of this study are: 1) to show that with the aid of improved measures of conceptive delays one can obtain a good fit with the Type 1 geometric model, and 2) to investigate some characteristics of rates of conception in a mixed or heterogeneous populations. Used data are 2,608 married women of Chunseong Gun Pregnancy Cohort Study between the ages 20 to 39 living with their husbands who were not premaritally pregnant, had conceived by the time of interview. The results obtained are as follows: 1) Mean fecundability computed by applying Pearson's Type 1 geometric model was 0.165. 2) The average of time required to conceive from the onset of marriage and the beginning of first conception was 7.6 months, and standard deviation was 9.7 months. 3) To test for goodness of fit, x²for the difference between observation between observation and hypothesis was 21.14,which was not significant at the 5% level. 4) The correlation between the two conception delays for Chunseong Gun was 0.13
협동조합에 대한 신제도론적 접근 - 완주 로컬푸드를 중심으로 -
이영환 21세기기독교사회문화아카데미 2014 신학과 사회 Vol.28 No.3
협동조합기본법 제정이후 우리나라에서는 협동조합의 설립이 활발하게 이루어지고 있다. 하지만 협동조합의 조직적인 특징과 협동조합 설립의 원인에 대한 구체적인 연구가 부족하다. 본 연구는 완주 로컬푸드 협동조합을 대상으로 협동조합 설립의 제도적 원인을 분석하고 이 협동조합이 가지는 특징을 살펴보았다. 신제도론의 거래비용이론을 활용하여 완주 로컬푸드 협동조합을 분석한 결과 완주 로컬푸드는 자산의 특정성이 높고 환경적 불확실성이 높은 것으로 나타났으며 이로 인해 거래비용이 많이 발생하는 구조를 가진 것으로 분석되었다. 거래비용을 완화하기 위해 협동조합을 설립하였는데 협동조합의 조직적 특징인 집단상표와 파트너십의 특징을 가지는 것으로 나타났다. In Korea, a lot of cooperatives are founded after enactment of basic law on cooperative establishment. But there are few studies about the cause of cooperatives and their characteristics. This study, using Wanju local food cooperative, tries to analyse the cause of cooperatives establishment and its organizational feature through new institutional approach. The result shows that Wanju local food cooperative has asset specificity and environmental uncertainty in transaction attributes. Also, this study founded that Wanju local food cooperative has collective brand and partnership which is main feature of cooperative.
ON EFFICIENT TWO-FLOW ZERO-KNOWLEDGE IDENTIFICATION AND SIGNATURE
이영환 한국전산응용수학회 2011 Journal of applied mathematics & informatics Vol.29 No.3
In this paper, we propose an effcient two-flow zero-knowledge blind identification protocol on the elliptic curve cryptographic (ECC) system. A. Saxena et al. first proposed a two-flow blind identification protocol in 2005. But it has a weakness of the active-intruder attack and uses the pairing operation that causes slow implementation in smart cards. But our protocol is secure under such attacks because of using the hash function. In particular, it is fast because we don't use the pairing operation and consists of only two message flows. It does not rely on any underlying signature or encryption scheme. Our protocol is secure assuming the hardness of the Discrete-Logarithm Problem in bilinear groups.
이영환,이명혁 한국세무학회 2016 세무와 회계저널 Vol.17 No.3
The purpose of this paper is to improve the existing management systems for public-service corporations that are not institutionally well equipped. In addition, this study researches how to improve simple incorporation procedures and tax benefits in order to respond to high public demand. This study is briefly summed up as follows. First, this study presents improvements on limitations on the range of public-service corporations for public benefits and the accurate application of tax laws. Second, this study presents the criteria for judgment of public benefits in order to verify the public-service corporations and manage the public-service corporations methodically. Third, this study presents the concrete realization of plans for public benefits verification in order to exclude competent authorities discretion and ensure the transparency of the selection process. Fourth, this study presents improvements that change the certificates of incorporation from approval policies to standing rules or authorizations and revisions of the related open laws in order to broaden the range of public services. As a result, this study expects that the public-service corporations management systems for public benefits that were presented in this study will become more transparent in the future. 공익법인이란 비영리법인으로 공익사업 운영을 위해 주무관청의 허가를 받아 설립된 법인을 말한다. 공익법인은 공익을 목적으로 한다는 점에서 영리법인과 구분되고, 불특정 다수의 이익을 목적으로 한다는 점에서 비영리법인과 구분된다. 공익법인은 그 범주상 비영리법인에 속하지만, 비영리법인 모두가 공익법인에 해당하는 것은 아니다. 이러한 공익법인은 경제․사회 규모가 커짐에 따라 복지실현에 필요한 재정수입을 조세만으로부담하기가 점점 어려워지고 있기 때문이다. 만약 정부의 재정이 부족하게 되면 정부주도의 복지를 축소 또는 포기할 수밖에 없어 복지수준은 낮아지게 된다. 이에 정부에서는 재정지출로 수행해야 할 고유의 기능을 공익법인이 상당부분 대신해 주기를 기대하고 있지만, 다양한 공익목적사업에 대한 정부의 전문성 부족과 주무관청의 재량적 판단에 따른 설립과 허가 등 선정절차와 관리가일원적․체계적이지 못함으로서 투명성이 결여되어 사회적 비난의 대상이 되고 있다. 본 연구는이러한 제도적 문제점을 분석하고, 이를 보완하기 위한 개선방안을 다음과 같이 제시하고 있다. 첫째 세법상 공익법인의 범위를 공익성 중심으로 통일하였다. 세법상 상이한 공익법인의 범위를공익성 중심으로 제한하고 세제혜택이 일관성 있게 적용될 수 있도록 공익법인의 범위를 정하고「상증세법」을 근거법령으로 하여 개별 세법에서 이를 준용토록 하는 것이다. 둘째, 모든 법인에 적용가능한 통일적 공익성 판단기준을 마련한 것이다. 공익에 대한 명확한 개념과 판단기준이 설정되어 주무관청의 재량적 판단의 자의성을 줄이고 객관적 기준에 따라 공익법인이 선정관리 되도록 하는 것이다. 셋째, 공익법인의 설립 및 심사 그리고 체계적 관리감독을 위한 공익 검증기구를 설치하는 것이다. 이는 공익법인의 선정과정의 투명성과 조세지원의 정당성을 확보하기 위하여 공익성 검증과관리 감독이 일원적으로 관리되어야 하기 때문이다.