도저용 착시 도재-금속 개면에서의 원소이동에 관한 실험적 연구

이근우,이호용,Lee, Keun-Woo,Lee, Ho-Yong 대한치과보철학회 1987 대한치과보철학회지 Vol.25 No.1

This study was undertaken to observe the elemental transition of Interface depending on different pretreatment methods, the number of filings, the kinds of porcelain powders and the various alloys in ceramo-metal restoration. The materials used in this study were Pors-on $4^{(R)}$ and Ceramco porcelain powder to compare the differences depending on the pretreatement methods and the number of firings. Ceramco porcelain powder and Vita porcelain powder were used to compare the differences of elemental transition depending on the porcelain powders. The $Parasil^{(R)},\;PGV^{(R)}$ and Pors-on $4^{(R)}$ as Pd-Ag alloy were used to compare the difference of elemental transition depending on the various alloys. The pretreatment methods were : no treatment, treatment under vacuum and air, treatment with 50 % hydrofluoric acid and double heat tretament. The number of firings were 3, 5 and 7 repeated firings All specimens were observed by SEM and concentration of elements were analyzed quantitatively with EPMA The results of this study were obtained as follows : 1. In the groups of air-treatment, concentration of Sn were the highest and widest. A high concentration of In were in the groups of vacuum and air treatment. 2. There were no significant differences in concentration of Sn between the group of vacuum, 5 minutes hydrofluoric acid and double heat treatment. (p>0.05) 3. As the period of time of hydrofluoric acid treatment increased, not only were the trace elements reduced but the main components such as Pd and Ag were also reduced. 4. Concentration of Sn and In increased and diffused with repeated firings but 5 repeated and 7 repeated firings groups had no significant differences. (p>0.05) 5. Sn were more concentrated in the group of Ceramco porcelaion powder than Vita porcelain powder. 6. The higher concentration of trace elements in the alloy, the more increasing concentration of Sn and In in the interface.

Rat에 있어서 ethanol투여가 체조직의 무기질 함량에 미치는 영향

이근우,이현범,Lee, Keun-woo,Lee, Hyun-beom 대한수의학회 1989 大韓獸醫學會誌 Vol.29 No.1

This study was designed in order to clarify the effect of ethanol drinking on the mineral contents on liver, kidney, muscle and hair. Forty-five rats were divided into 2 groups and a control group. The control group received tap water and the other 2 groups were given 8% and 40% ethanol as drinking source. Liver, kindney, muscle and hair samples were taken and analyzed for zinc, calcium and copper contents by atomic absorption spectrophotometric methods. The results obtained are summrized as follows; 1. The zinc content of muscle showed significant (p<0.01) decrease in both groups. 2. The calcium content of hair showed significant (p<0.1) increase in 8% ethanol group. 3. The copper contents of kidney and muscle in 8% ethanol group and liver in 40% ethanol group showed significant (p<0.1) decrease.

섬유주세포에서 Dipyridamole이 활성산소종과 산화스트레스에 미치는 영향

이근우,김재우,Keun Woo Lee,Jae Woo Kim 대한안과학회 2013 대한안과학회지 Vol.54 No.3

Purpose: To investigate the effects of dipyridamole (DPD) on the production of reactive oxygen species (ROS) and oxidative stress in cultured human trabecular meshwork cells (HTMC). Methods: Antioxidant activity of DPD was determined by DPPH assay. Primarily cultured HTMC were exposed to 0, 20, and 50 μm DPD using serum-deprived media. The effect of DPD on the production of ROS was assessed with the DCHFDA assay. The effect of DPD on the t-butyl hydroperoxide (tBHP)-induced oxidative stress was assessed with resazurin assay. Results: DPD showed significant antioxidant activity. DPD significantly decreased the production of ROS (p < 0.05) and improved cellular activity significantly after treatment with t-BHP (p < 0.05). DPD did not affect the generation of nitric oxides. Conclusions: DPD suppressed the formation of ROS and possessed cytoprotective activity against the oxidative stress in HTMC.

사료내의 아연과 칼슘이 돼지 부전각화증의 발생에 미치는 영향

이근우,이현범,Lee Keun-Woo,Lee Hyun-Beom 대한수의사회 1984 대한수의사회지 Vol.20 No.1

Present experiments were conducted in order to clarify the effect of dietary low zinc and excess calcium on the zinc and calcium concentrations of serum and feces, and to show the therapeutic effect of external application of zinc or soybean oil on the sk

사료내 카드뮴 첨가가 체조직과 피모의 카드뮴, 아연, 철 및 구리함량에 미치는 영향

이근우,이현범,Lee, Keun-woo,Lee, Hyun-beom 대한수의학회 1987 大韓獸醫學會誌 Vol.27 No.2

This thesis was designed to find out whether the cadmium content of hair in living animals reflects the status of cadmium accumulation in internal organs or muscles so that this status can be used as a diagnostic method. Forty-five rats were divided into 4 experimental groups and one control group. The control group received a basal diet which contained zinc $100{\mu}g/g$, iron $80{\mu}g/g$ and copper $135{\mu}g/g$. The experimental group received experimental diets sllpplemented with 1, 10, 100 or $1,000{\mu}g/g$ cadmium as cadmium sulfate. Rats were dissected on the 28th or 56th day of experimental periods and tissues, blood and hair samples were taken, dried and burned to ash and analysed. The cadmium, iron zinc and copper concentrations were measured with an atomic absorption spectrophotometer. In addition feed efficiency and hematological changes were observed. The results obtained can be summerized as follows: A marked decrease in feed intake, weight gain and feed efficiency were observed from 1 or 2 weeks of experimental periods, which was in accordance with the dosage and periods. The cadmium contents of kidney, liver, spleen and muscle were significantly increased in all experimental rats; the accumulation was marked in kidney and liver tissues. It was shown that the cadmium contents of hair reflects the cadmium accumulation in internal organs and muscle; the higher the cadmium levels of diet and of rat tissues, the higher the cadmium content of hair. In the $100{\mu}g/g$ group of rats erythrocyte counts and. hemoglobin concentrations were decreased. A significant(p<0.01, p<0.05) increase in iron contents of kidney, liver and muscle was observed in 10, 100, $1,000{\mu}g/g$ groups of rats on the 28th day of experiment. A significant (p<0.01, p<0.05) increase in zinc contents of kidney, liver and muscle was observed in all experimental rats. On the other hand, serum zinc concentration was decreased. A significant(p<0.01) increase in copper contents in the liver was observed on the 28th day in $100{\mu}g/g$ and $1,000{\mu}g/g$ groups of rats. From these results it may be concluded that the analysis of hair for cadmium is a useful diagnostic approach for the cadmium status of internal organs and muscle in living animals.

수지접합 수복물용 합금의 피착면처리에 따른 결합력에 관한 실험적 연구

이근우,Lee, Keun-Woo 대한치과보철학회 1991 대한치과보철학회지 Vol.29 No.1

This study investigated the effects of surface treatment on the tensile bond strength of resinbonded prosthesis. The Rexillium III specimens were treated with $50{\mu}m\;Al_2O_3$ blasting. Type IV gold alloy specimens were treated with $400^{\circ}C$ heating and tin plating method. All specimens were bonded with MBAS composite resin cement and followed by immersion test into the $37^{\circ}C$ water bath for 7 days. The specimens were debonded in tension with an Instron machine and observed with SEM. The modes of failure were recorded also. The following conclusions were obtained : 1. The tensile bond strength decreased in following order. $50{\mu}m\;Al_2O_3$ basted Resillium III group, Type IV gold alloy group treated with $400^{\circ}C$ heat and tin plating type IV gold alloy group, and statistical significant differences were observed(p<0.05). 2. The tensile bond strength decreased in all groups after 7 days immersion test, but statistical significant differences were observed in Rexillium III specimens only. 3. The sharp and irregular surface were observed in Rexillium III, but $400^{\circ}C$ heat treated and tin plated groups had round and broad surface in SEM. 4. The models of bond failure were cohesive-adhesive failure mainly.

특별사법경찰제의 체계적 통일성을 위한 기초연구

이근우 ( Keun Woo Lee ) 안암법학회 2011 안암 법학 Vol.0 No.35

Special Judicial Police has been in our legal system for quite some time. The qualification and scope of function of judicial police officials in regard to forestry, marine affairs, monopolies, taxes, military investigation institution and other special matters shall be provided in Acts (Criminal Procedure Act 197). Although this judicial system had not been in application for long since the birth of it, after recent discussions on feasibility of it, this system has been actively applied This system is evaluated positively in a perspective: those with specific experience in the related field are given roles as judicial police officers and they can enforce a law more professionally without any delay. On the other hand, as the active application of this system been driven mainly by the practical needs, one may question about its adequacy with our existing judicial legal system. Particularly, the professionalism in the related field does not necessarily reach the level of the professionalism that is called for from Judicial Police Officers who conduct Seizure, Search and personal detention. As a result, this system could easily turn into another case of administrative expediency. In this paper, based on awareness of the matters mentioned above, relative consequences are examined. In order for Special Judicial Police to better serve its purpose, we should be able to see more of national-wide unity, instead of implementation by autonomous entity as now. Furthermore, more structured training and systems for Special Judicial Police are highly required.

자본시장법상 조사 제도의 형사법적 문제점

이근우 ( Keun Woo Lee ) 안암법학회 2013 안암 법학 Vol.0 No.40

There is a unique administrative investigation system in the former Securities and Exchange Act and Financial Investment Services and Capital Markets Acts. These acts enact a provision that public officials specified by Presidential Decree (hereinafter referred to as "investigative officials") among those who work for the Financial Services Commission to interrogate the suspect involved in such as violation, seize goods, or search a place of business, etc. The general seizure and search are banned from Korean criminal law, a warrant of seizure or of search shall be issued in cases where a seizure or search is to be affected and shall be executed by a judicial police official under the direction of a public prosecutors. In other words the seizure and search are exceptional constraint disposition. The investigative officials are not the position of special judicial police in Act on the Persons Performing the Duties of Judicial Police Officials and the Scope of their Duties. But the provision includes they can carry out constraint disposition. The problem of an administrative investigation of investigative officials is clear, of course, it is actually vastly underutilized as yet. On the other hand, the proposal to enable this system is coming. This article pointed out the problems of criminal law according to the investigations of the investigation officials who doesn`t have policed powers and proposed an alternative to forced investigative authority of administrative agencies.

행정조사의 형사법적 한계설정

이근우 ( Keun Woo Lee ) 고려대학교 법학연구원 2014 고려법학 Vol.0 No.72

국가의 의미, 기능이 확장됨에 따라 국가의 업무수행 일반을 통칭하던 ‘행정’의 의미와 기능도 변화하고 있다. 이러한 행정 작용에는 그 적절한 행사를 위하여 사전에 정보를 수집하는 것을 의미하는 ‘행정조사’가 필수적이다. 종래에 이러한 행정조사는 단순한 사실행위로 취급되거나, 대상자에게 불이익을 초래하지 않는 작용으로 취급되어 법적 관심에서 상대적으로 소홀하게 취급되어온 것이 사실이다. 그러나 국세청의 ‘세무조사’에서 느껴지는 것처럼 조사라는 이름이 붙어 있다 하더라도 대상자에게 대단히 큰 불이익을 초래할 수 있는 것이 있고, 행정법규 위반에 대한 벌칙으로서 형벌이 규정되어 있는 경우 형사절차에서의 ‘수사’와 그 내용, 기능이 중첩되는 영역이 있는 것이 사실이다. 그런데 몇몇 영역에서는 이러한 중간지대에 대하여 실질을 형사소송법상 수사이면서도 행정조사의 형식으로 이를 수행함으로써, 영장주의, 진술거부권과 같은 형사법이 규정하고 있는 바의 엄격한 형식성, 절차성을 회피하려는 경향을 보이고 있다. 이러한 관점에서 보면 비록 ‘행정조사’라는 이름으로 불리고 있을 지라도 당사자 보호를 위해서 특별한 법적 고려가 필요하다고 본다. 이 글에서는 이러한 시도의 문제점을 지적하고 보호형식성을 제고 할 수 있는 방안을 모색하여 보기로 한다. The meaning and function of ‘administration’ has also changed as the extending of the meaning and function of the State. Administrative means for guaranteeing each citizen or group`s performance of duty have been concentrated on the effectiveness of administrative functions. Administrative investigation which is collecting the information for appropriate exercise of administrative action is essential for administrative action. Conventionally, these investigations were handled as facts or action does not result in a disadvantage for subjects which have been relatively neglected. In other words they have been so much indifferent to the infringement over each citizen or group`s basic human rights. For example, the tax investigation of National Tax Service is called “investigation”, however, that results in very large disadvantages. If there are the penalties for violation of administrative regulations, it has overlapping area of criminal investigation. However, in some areas, this is done in the form of administrative investigation, in fact, in spite of the investigation of criminal procedure law. Through this way, administrative authority tries to avoid the strict format and procedure of criminal procedure law. From this perspective, we need to a special legal consideration for protection the people. Therefore we need to scrutinize administrative investigation system. This article points out the problems these approaches and suggests some method for improving protection.

공익광고 메시지 전달과정의 합리성에 관한 연구 : 한,미,일 공익광고 메시지 전달과정을 중심으로 Korean, U.S., and Japanese Public Announcement Processes Considered

이근우 ( Keun Woo Lee ),박철민 ( Chul Min Park ) 한국지역언론학연합회 2004 언론과학연구 Vol.4 No.2