아산화질소의 선택적 촉매 제거반응을 위한 Clinoptilolite형 천연제올라이트 촉매 개발

추수태,정우현,조성수 한국공업화학회 2003 공업화학 Vol.14 No.7

지구 온난화 가스로 알려져 있는 아산화질소(N₂O)를 제거하기 위해서 Fe, Co, 및 Cu 등의 다양한 금속이온이 교환된 국내산 clinoptilolite형 천연 제올라이트 촉매를 사용하여 고정층 흐름반응기에서 연구되었다. 공간속도 15000 h^(-1)의 반응조건에서 천연제올라이트 촉매들은 반응온도 400~450℃의 온도에서 가장 높은 활성이 관찰되었다. 본 연구에서 사용된 천연제올라이트 촉매의 경우, 선택적 촉매 환원반응을 위해 주입되는 메탄 혹은 프로판이 우수한 제거활성이 관찰되었는데 질산 혹은 아디프산 제조공정에서 발생하는 N₂O 제거반응에 효과적으로 사용될 수 있을 것으로 판단된다. Metal(Fe, Co, and Cu) ion-exchanged natural clipnotilolite-type zeolite catalysts have been investigated to selectively reduce nitrous oxide(N₂O), known well as a greenhouse gas, by reductants in the fixed-bed flow reactor system. These zeolite based catalysts show the highest catalytic activity for N₂O removal in the reaction conditions of reaction temperature of 400-500℃ and space velocity of 15000h^(-1). In the selective reduction of N₂O using natural zeolite catalyst, Ch₄, or C₃H^(8) gases seems to be used effectively as reductants to eliminate the greenhouse gas produced from the nitric acid or adipic acid manufacturing processes.

財閥企業과 非財閥企業간 技術革新에 관한 比較硏究

신태곤,주수현 釜山大學校 商科大學 1994 釜山商大論集 Vol.65 No.-

The purpose of this paper is to analyze empirically the difference of innovation between the Chaebol and Non-Chaebol in Korean manufacturing industries and suggest some policy implication for the purpose of promoting research and development on the basis of the empirical results. The classical Schumpeter's hypothesis states that there is a positive relationship between monopoly and degrees of innovation and that large firms are more innovative than small firms. Since then, however, empirical studies of the Schumpeterian hypothesis do not support this hypothesis. Instead, a new hypothesis has emerged : An effective oligopoly market (intermediate firms) promotes the highest rate of innovative activity. The empirical results are as follows: ① In linear regression analysis of R&D expenditure and firm size, R&D expenditure generally increases less than proportionately with firm size. In the two degree-polynominal relationship between R&D expenditure and firm size, it is found that the relationship has maximum point. Therefore, innovation is actively performed in the intermediate firms over large firms or small firms. In this case the Schumpeterian's hypothesis is unaccepted. ② The concentration of economic power in Korean economy is an important problem. Korean business groups are, in fact, controlled by a handful of owners in most cases. The relationship between group dummy variable and R&D intensity is a positive relationship. In LOGIT model estimation of group, a group is empirically explained with the diversity, ownership structure, etc. The impact of advertising intensity, growth of industry, capital/labors on R&D intensity is positive. The profitability, debt ratio is a negative relationship with R&D intensity. ③ This paper has examined the relationship between management stock holding and R&D expenditures of a firm respect to moral hazard and adverse selection in asymatric information. Agency theory implies that a manger is reluctant to take R&D expenditure. Management stockholding generally works to reduce agency problems between share holders and mangers. Empirical results show that R&D intensity rises as the increasing of management stock holding. In particular, it is found that the relationship has maximum point. The findings above suggest a valuable policy implication. The future R&D strategy have basically to strengthen the competition for innovation to maximize the profit resulting from it, and the policies to induce this circumstance must be enforced. Also, industrial innovation policy is needed to strengthen innovation by way of a harmonized promotion of both demand policy and supply policy.

제1형 당뇨병 환자에서 췌도세포 동종이식의 반복시행

양태영,정인경,서인아,오은영,조건영,오승훈,김성주,정재훈,민용기,이명식,이문규,김광원,도영수,주성욱 대한당뇨병학회 2002 Diabetes and Metabolism Journal Vol.24 No.4

연구배경:췌도세포 이식은 시술이 간편하고 안전하기 때문에 반복이식이 가능하여 그 동안 여러 센터에서 반복이식의 성공을 보고한 바 있다. 국내에서도 본 병원을 비롯하여 몇몇 센터에서 췌도세포 이식이 활발히 시도되고 있으나 사람에서의 동종이식 및 동종 이식의 반복시행은 보고된 바 없는 실정이다. 저자 등은 국내 최초로 췌도세포 동종이식을 시행하여, 혈청 C­펩타이드가 증가하고 인슐린 요구량이 감소하였으며, 혈당농도와 당화혈색소의 안정을 보였다. 그러나 이식 70일 후 다시 인슐린 요구량이 증가하고 C­펩타이드가 감소하여 췌도세포 이식을 다시 시행한 바 있다. 2차 이식 후 70여일이 지난 현재 다시 혈청 C­펩타이드가 증가하고, 인슐린 요구량이 더 감소되어 췌도세포 이식에서 반복 시행의 유용성을 보고하는 바이다. 방법:환자는 32세 남자로 17년전 당뇨병 진단 후 인슐린 치료 중이었으며, 3년전 부터는 만성신부전증으로 혈액툭석을 하고있었다. 1999년 12월 25일 신장이식을 하였고 3일 후 췌도이식을 하였으며, 두번째 이식은 70일 후 시행하였다. 췌도분리는 변형된 Recordi방법과 비연속성 자당 농도차(discontinuous density gradient)를 이용하였으며 분리한 췌도는 배양 후 환자의 신장기능이 정상화되고 미생물학 검사에서 음성을 확인한 후 경피경간으로 간문맥을 접근하여 16G 폴리 에틸렌 카테터를 이용하여 간실질에 이식하였다. 결과:1차 췌도이식시 순수분리전 췌도수는 210,000개, 순수분리후 획득한 췌도수는 90,000개, 순도 95%, 세포양 1.0mL 이었고, 2차 췌도이식시 순수분리전 췌도수는 420,000개, 순수분리후 획득한 췌도수는 370,000개, 순도 95%, 세포양 1.5mL 이었다. 1,2차 모두 간문맥을 통해 약 20분에 걸쳐 간실질에 주입하였다. 췌도이식전 인슐린요구량은 75∼75U/일, HbA1e 8∼10%, C­펩타이드 0.6ng/mL 였으며, 1차 췌도이식수 7일째 인슐린 요구량은 40U/일, C­펩타이드 1.5ng/mL, FPS 109mg/mL 였고, 40일 추적관찰 후 인슐린 요구량이 36U/일, C­펩타이드 1.8ng/mL, HbA1e 6.5∼7.0%로 안정되었다. 그러나 이식 50일째부터 인슐린 요구량이 50∼56U/일, C­펩타이드 0.6ng/mL, FPS 130∼200mg/dL로 혈당 조절이 불안정하여 다시 췌도이식을 시행하였다. 2차 이식후 50일이 경과한 현재, 인슐린 요구량은 26U/일, C­펩타이드 1.8ng/mL, FPS 90∼120mg/dL로 다시 안정되었다. 결론:췌도이식은 반복이식이 가능하며, 본 환자의 경우 인슐린요구량 감소, 혈당의 안정화 및 C­펩타이드가 상승하여 이식한 췌도의 기능을 확인할 수 있었고, 향후 스테로이드 등 면역억제가 유지 용량으로 감량되면 인슐린 요구량은 더 감소될 것으로 기대된다. Over the past 20 years, significant advances have been made in human islet transplantation. However, cases of prolonged insulin independence after islet allotransplantation have rarely been reported and over time, a slight, gradual decrease in insulin secretion appears to occur, as suggested by the lower C-peptide. Although preliminary clinical success achieved over the past few years has been considerably higher with whole pancreatic transplant than with isolated islet grafts, both approaches remain experimental. Islet grafts might gain, over time, increasing credibility and might eventually provide an easier alternative in terms of grafting procedures and patient management, as compared with the more "traumatizing" whole-pancreas transplantation. Also, using islet, re-transplantation is possible. But it is not known whether re-transplantation of islet could be suitable for those patients who lost grafted islet function. The aim of the present study was to investigate the benefits of re-transplantation of islet in previously simultaneous islets-kidney transplant (SIK) patient who have lost graft function. Methods : The recipient was a 32 year old male. First islet transplantation was underwent at December 25, 1999. However, the grafted islets lost function after 70 days. So we performed re-transplantation of islets. The isolation of islet was conducted sterilely on a laminarflow hood and isolated by a modified Recordimethod. The islet was injected slowly into the liver via a cannular placed in the potalvein for 20 minutes. Results : Transplanted islets were 90,000 IEq at first islet transplantation, 370,000 IEq at second islet transplantation. The insulin requirement was reduced from 75-85 to 35-40 U/day, the basal C-peptide level was 1.5 ng/mL at 7 days posttransplant Unfortunately, the grafted islets lost function after 70 days. After second transplantation, the insulin requirement was reduced to 26 U/day. Conclusions : Despite the continuous need for exogenous insulin therapy, islet transplantation can prevent wide glucose fluctuations, thus resulting in normalization of glycemic control and improvement in HbAlc, and also, show that islets can be successfully and safely re-transplanted intraportally in patients who have lost previously grafted islet function (J Kor Diabetes Asso 457~466, 2000).

危機對處政策의 類型에 관한 硏究 : 國家自律性과 「維新」 The State Autonomy and YUSHIN

姜珉,朱秀基,姜太勳 단국대학교 1985 論文集 Vol.19 No.-

The important issue in understanding the dependent capitalist state appears to be concerned with the state role and state autonomy. In this vein, the functions and characteristics of the state need to be reanalyzed in their interrelationships. Under what condition and circumstance enjoy autonomy from the ruling classes and others? How are the state autonomy and the policy mechanism interrelated in the crisis situations? These are primary concerns in this study. The purpose of the present study is to formulate a conceptual framework for analyzing the policy styles of crisis management and, then, apply the formulated framework to an actual case (YUSHIN is selected in this study). To do so, the study reviews ⅰ) the state role and crisis dimensions, ⅱ) the situational determinants and variables in the state autonomy, and ⅲ) the instrumental autonomy and policy styles. In order to understand the crisis syndromes of national security during the Third Republic, the present study places its emphases on the undermining factors in inter-Korean relations, those changes in international context, and the disturbances in international political economy. Then, the present study focuses upon the capital accumulation, the legitimacy crisis and the stateautonomy in terms of state unity, state power, cohesiveness of the ruling class, and activation of the popular class. The following conclusions are secured from this study on the policy styles of crisis management by examining the state autonomy and YUSHIN. First. The state managers have demonstrated an active attitude in coping with the immediate problems, and their styles of policy implementation can be characterized by the imposition pattern--rather than by the consensus pattern. Second. The aforementioned policy pattern resulted in the concentration ofl politiacal power on the part of the President and his subordinate technocrats. Third. Thus, the state autonomy has been strengthened furthermore. In other words, state unity, the cohesiveness of the ruling class and state power have been reinforced consequently. Fourth. The political and economic demands of the popular classes, which have been increased in the process of industrialization, became greatly activated. Finally, it emerged as a political force which could decrease the level of state autonomy. Fifth. Viewed from a comparative perspective, YUNSHIN reveals some distinctive characteristics in comparison with other crisis situations. In YUSHIN, the military did not participate actively and openly in coping with the crisis, and it stood on the same side with the ruling elites in the existing political system. In other words, the military directly intervened into the political scene with physical forces in the crises such as 「4.19」,「5.16」and「10.26」. To the contrary, in the case of YUNSHIN, the crisis was rather successfully managed only with the side support from the military.

백혈병환자의 정신병리

김은혜,한진희,김광수,유태열,김춘추 가톨릭 중앙의료원 가톨릭 암센터 1991 가톨릭 암센터 論集 Vol.5 No.1

Characteristics of Ni/YSZ Cermet Prepared by Mechanical Alloying Method for the High Temperature Electrolysis of Steam

Choo, Soo-Tae,Kang, Kyoung-Hoon,Chae, Ui-Seok,Hong, Hyun-Seon,Hwang, Kab-Jin,Bae, Ki-Kwang,Shin, Seock-Jae The Korean Ceramic Society 2006 한국세라믹학회지 Vol.43 No.12

Ni/YSZ $(Y_2O_3-stabilized\;ZrO_2)$ composite as an electrode component for High Temperature Electrolysis (HTE) was fabricated by mechanical alloying method using Ni and YSZ powders. Characterization of the synthesized composite was investigated with various analysis tools, including XRD, SEM and PSA, and a self-supporting planar unit cell prepared with the Ni/YSZ composite was prepared to study the electrochemical reactions for the production of hydrogen. The Ni/YSZ cermet is composed of crystalline Ni and YSZ, in a sub-micro scale, and has an even distribution without aggregated particles. In addition, under an electrochemical reaction, the unit cell showed an $H_2$ evolution rate from steam of 14 Nml/min and $600mA/cm^2$ of current density at the electrode.

Effect of Calcination Temperature on the Characteristics of SO^2-_4/TiO_2 Catalysts for the Reduction of NO by NH_3

Choo, Soo Tae,Nam, In-Sik,Ham, Sung-Won,Lee, Jeong-Bin 한국화학공학회 2003 Korean Journal of Chemical Engineering Vol.20 No.2

The catalytic activity of sulfated titania(ST) calcined at a variety of temperatures has been investigated for selective catalytic reduction(SCR) of NO by NH_3. The NO removal activity of ST catalyst mainly depends on its sulfur content, critical role of sulfur species on the surface of TiO_2. The role of sulfur is mainly the formation of acid sites on the catalyst surface. The presence of both Brφnsted and Lewis acid sites on the surface of sulfated titania has been identified vy IR study with the adsorption of NH_3 and pyridine on ST. The reduction of the intensity of IR bands representing Bφnsted acid sites is more pronounced than that revealing Lewis acid sites as the calcination temperature increase. It has been further clarified by IR study of ST500 catalyst evacuated at a variety of temperatures. The NO removal activity also decreases with the increase of the catalyst calcination temperature. It simply reveals that Brφnsted acid sites induced by sulfate on the catalyst surface are primarily responsible for the enhancement of catalytic activity of ST catalyst containing sulfur for NO reduction by NH_3.

변전소 자동화 시스템에 적용된 XML 연구

정태선(Tae Sun Chung),김정수(Jeong Soo Kim),송운식(Un Sig Song),장혁수(Hyuk Soo Jang),장병태(Byung Tae Jang),이재욱(Jae Wook Lee),추진부(Jin Boo Choo) 대한전기학회 2005 대한전기학회 학술대회 논문집 Vol.2005 No.7

산업체 VOC/악취 저감기술

추수태(Soo-Tae Choo),남창모(Chang Mo Nam) 한국산업융합학회 2004 한국산업융합학회 논문집 Vol.7 No.3

Emissions of volatile organic compounds and odors from various industrial processes not only pollute surrounding life environments, but also lead to the deterioration of the working environments, causing various industrial health and business problems. These pollutants are usually stimulating, irritating, malodorous and sometimes carcinogenic, Which should be reduced in the pollutants formation, stage, but the practical processes do not allow The paper describes the major sources of VOC and odors, and their sampling/analysis methods. Furtbermore, various removal technologies for these pollutants are suggested, which particularly include the characteristics of the catalytic and scrubber/carbon filter combined process, and even process design technologies<br/>

고온 수증기 전기분해용 고체산화물 전지 시스템 개발

추수태(Soo-Tae Choo),채의석(Ui-Seok Chae),홍현선(Hyun Seon Hong) 한국가스학회 2005 한국가스학회 학술대회논문집 Vol.2005 No.5