英語語形成硏究

이두철 高麗大學校 1991 국내박사

運動負荷에 따른 血液成分의 變化硏究

이두철 國民大學校 敎育大學院 1987 국내석사

英語의 格理論에 關한 硏究 : On case theory in English

이두철 高麗大學校 1983 국내석사

연마시 여러가지 수복재와 이장재의 사용에 따른 치수내 온도변화

이두철 全北大學校 1999 국내석사

Hydrogen peroxide 농도와 적용시간이 hydroxyapatite discs의 미백과 물리적 성질에 미치는 영향

이두철 全北大學校 2006 국내석사

The purpose of this study was to evaluate the effect of various concentration and application time of hydrogen peroxide on tooth whitening and physical properties. The hydroxyapatite (HA) discs of 12 ㎜ (Φ)×1.2 ㎜ (t) in dimensions were made by compression (100 kg/cm2) and sintering (at 1350℃ for 2 hours). All specimens were polished sequentially with #240 through #2000 emery paper and one side of each specimen was polished finally with 0.3 ㎛ alumina paste. The discs were placed in sterile whole stimulated saliv47a overnight at 37℃ in order to form an in vitro pellicle layer. Then the discs were rinsed with distilled water and soaked into staining broth at 37℃ for 7 days. These stained specimens were bleached with hydrogen peroxide according to the change of concentration (3~30%) and application time (3~10 days). The specimens were analyzed with a spectrophotometer, X-ray diffractometer (XRD), scanning electron microscope (SEM), surface roughness tester, and microhardness tester. Biaxial flexural strength was measured using a ball-on-three-ball loading device at a crosshead speed of 0.5 ㎜/min. The results showed that the bleaching effect was increased according to the increased concentration and application time of hydrogen peroxide. The surface roughness was increased with the increased concentration and extended time. There wasn’t significant difference in 3% and 7% concentration with each application time but there were significant differences in 15% for 10 days, 30% for 7days and 10 days respectively(p<0.05). The change of crystal phase before and after bleaching were examined by XRD and there were not any differences. The biaxial flexural strength was significantly decreased after bleaching of 30% hydrogen peroxide for 7 and 10 days(p<0.05), and the Vickers hardness was significantly decreased after bleaching of 15% hydrogen peroxide for 10 days and 30%, for 3, 7, & 10 days respectively(p<0.05). The micropores was increased with the increasing concentration and application time of hydrogen peroxide in all experimental groups which was taken by a SEM(scanning electron microscope)(X 500). The highest increase was shown in 30% for 10 days. Although the tooth bleaching effect was greater when the high concentration was applied, further in vivo experiment will be needed to prove it's safety.

정보보호 위험관리를 위한 정보시스템 운영감리 개선 연구

이두철 건국대학교 정보통신대학원 2015 국내석사

정보의 고도화, 대규모화 되면서 개인정보유출, 내부 대외비 등 중요자료 유출 등 내·외부의 위협에 노출될 수 있는 상황이 빈번히 발생하고 있다. 이러한 위험으로부터 정보시스템의 안전한 설계, 구축, 운영에 이르기까지 조직의 자산에 대한 위험을 감수할 수 있는 수준으로 유지할 필요가 있다. 이를 위해 내부에서 운영하고 있는 정보자산에 대한 위험을 분석·평가하여 도출된 위험으로부터 보호대책을 수립하여 비용 대비 효과적인 방안을 마련하기 위함이다. 본 연구의 목적은 정보시스템 개발에 따른 정보보호 위험관리 및 위험관리의 정성적·정량적 평가, 이에 따른 정보시스템 개발 시 위험관리 프로세스 및 위험관리 범위산정에 대해 논의하고자 한다. 또한 정보보호 위험관리를 위한 정보시스템 감리 활성화를 위해 국제 표준 위험관리와 국내 표준 정보 보호를 위한 정보보호 관리체계(ISMS) 방법론을 기반으로 정보시스템 감리 지침 개선방안에 대해 실증 연구하고자 한다. 따라서 기존 정보시스템 감리모형을 바탕으로 정보보호 관리체계(ISMS)의 위험관리 절차와 정보보호를 효과적으로 수행하기 위해 국·내외 정보시스템 위험관리체계를 비교하고 세부 점검 항목을 도출하여, 정보시스템 위험관리를 위한 개선 방안을 제시하고자 한다. 또한 기존 정보시스템 감리 지침서를 기반으로 각 단계 별 필요한 정보보호 위험관리 기반 정보시스템 감리 점검 항목들을 설계하였다. 본 논문을 실증 검증하기 위한 설문조사는 기업 보안 부서에서 근무하고 있는 담당자와 보안 관련 업계 종사자 그리고 정보시스템 감리 전문가 등 IT업계 종사자들을 대상으로 설문조사를 실시하였다. 이를 통해 정보보호 위험관리를 위한 정보시스템 감리에서 신규로 도출된 점검 항목을 적용하여, 정보시스템의 위험에 대한 사전 조치가 이루어지고 추후 발생할 정보시스템 위험에 대한 발생 빈도를 줄일 수 있도록 최선을 다해야 할 것이다. 마지막으로 정보시스템 위험관리와 정보보호 수준을 높일 수 있도록 정보보호 위험관리를 위한 정보시스템 감리를 체계화하고 표준화하여 기업 조직원과 고객 서비스에 대한 신뢰를 향상 시킬 수 있는 대안을 제시해야 할 것이다.

韓國企業의 外國資本投資誘因에 關한 硏究 : 製造業의 經營實態分析을 中心으로

이두철 檀國大學校 1982 국내석사

The economy of our country that could not promote the economIcgrowth due to the shortage of the national capital have made astrikIng growth during the past ten years. This economic growthowes Its high level to the inducement of the foreign capital. Therefore in this thesis it aims to present some reasonablesuggestions for the investment inducement of -the foreign capital,by which the economy of our country can be improved from thedeveloping country to the advanced country in the future. These suggestions were also based upon the theoretical analysIsand case studies as to the investment inducement of the foreigncapItal which is inevitable to self-economy achievement, and wereoffered through analysis of the management aspect and revelatIon ofproblems in our manufacturing industry. This thesis, handling the invest'nent inducement of foreigncapItal as the -nain subject, was studied and analyzed under theclassIfication of external & internal causes of the enterprise. The proble'ns on the external causes of the enterprise are, First, about those of invest-nent system. The details are asfollows: (I) Prohibitative or limitative measures regarding the invest-ment lines should be taken so as to exclude the possibIlityof beinp: economically subordinated by the recipientcountry. (2) As a Problem reUardinU foreigners* stock holdIng ratIo,provisions upon the investment ratio have been lacked. (3) As a problem rea-ardinp employment and domestic productionof foreign Uoods, Provisions upon these problems are lacked. Under the consideration of the above proble'ns, the economiceffects, due to the concentration into only quantitative side ininvestment system, seem to have been ignored. Second: The Investment enviromnen+ of our country was muchmore favorable in comparision of that of other developing countries. Third; Withdrawal of -principal and remittance of its returnsa-Ue not hampered by any limitative measures, No limitation upon stock dividends should not be added, but limitation upon stock sale differential, on purpose of preventinp speculation, is desirable. The problems on the internal causes of the enterprise are as follows; First: Problems ca"i be found through analysis of manaUement -B-s-pect, and imbalance of financial structure and inappropriateness of financial ratio were revealed throuerh the analysis. All indexes such as owned capital ratio, fixed assets ratIoand deepening condition of reliability ratio of borrowed capital tocover the fund pressure resulted from profit deterioration under thebusiness de-pression particularly from the second half of 1979, werefound to the extent of threatinR the enterprise stability. Seconds In aspect of productivity of labor, owing to the in-fluence of the increased labor cost from the latter half of 1970*s,inability o? satisfying "owing to obtainment of the productIvityeasily and cheaply", which marked the first place amonU motivatIonsof overseas investment, could be pointed out. Third: In aspect of fund supply, enterprises were moredependent upon indirect financing than direct financing. Particu-larly fund supply ratio by means of stock issuIng was found to bedecreased bv degrees. Finally it was found that the entrepreneur, by using soundmeans, should improve his enterprise and entrepreneurs' ethics withintention of serving to the society should be established. ThIs thesis is designed to contribute to the extension of theranee of foreisn capital inducement inevitable to promote the highlevel of economic iUrowth, and to contribute to the selective induce-ment of favorable foreleg capItal under the favorable terms.