백서피부의 화상 손상에 따른 효소조직화학적 변화

조백현,김영길,허우회,최석현 大韓成形外科學會 1983 Archives of Plastic Surgery Vol.10 No.2

The purpose of this study was to investigate the sequential changes of enzyme activities in severely burned skin of rat at intervals of 2 hours, 8 hours, 1 day and 3 days by histochemical methods. The results obtained were as follows. 1. Acid phosphatase activity was found to be transient increase in dermis and mild decrease in epidermis, hair follicle and sebaceous gland at 2 hour after burning. The activity was not seen in skin after 8 hours. 2. Alkaline phosphatase was found to be decreased in blood vessel and dermal papillae of hair follicle at 2 hour after burning and then was progressively decreased after 8 hours. 3.α-naphtyl acetate esterase activity was found to be decreased in epidermis, dermis and hair follicle at 2 hours after burning and was not seen in skin after 8 hours. There was no significant changes in sebaceous gland after burning.

문서화상의 신뢰성 향상을 위한 효율적 합성알고리즘

우종원,김호걸,최길성,유재수,조기형 충북대학교 컴퓨터 정보통신 연구소 1998 컴퓨터정보통신연구 Vol.6 No.2

본 논문은 Distance 합성알고리즘과 Runlength-Distance 합성알고리즘을 이용하여 효율적으로 문서화상을 합성하기 위한 방법을 제안한다. 데이터 또는 문서의 화소정보를 비밀리에 화상에 혼합하는 합성 알고리즘에는 임 Runlength 합성알고리즘(RM), Distance 합성알고리즘(DM), Runlength-Distance 합성알고리즘(RDM)등이 제안되었다. 그러나 이러한 합성알고리즘들을 적용한 기존의 방법은 암호화 시간이 길어지고 신뢰도가 떨어지는 문제점을 갖는다. 본 논문에서는 DM과 RDM 알고리즘을 보다 효율적으로 적용하여 암호화 시간을 단축시켰다. 또한, 기존 합성알고리즘에서의 합성방법을 변형한 형태로서 모듈별로 디지털 서명을 합성하는 방법을 제안한다. 이렇게 모듈별로 디지털 서명을 가함으로써 보안 전송에 있어서 가장 중요한 요소인 신뢰도를 증가시키도록 하였다. Runlength Mixing(RM), Distance Mixing(DM) and Runlength-Distance Mixing(RDM) algorithms have been proposed for mixing of bits of document-images security. However the existing mixing algorithms have some problems that increase cryptographic time and reduce confidence. In this paper, we propose an algorithm for mixing document images efficiently by using DM and RDM. When we mix digital signatures and secure documents, by using DM the proposed algorithm reduces the encryption time of document images. In addition the proposed algorithm mixes digital signatures by each module in order to increase confidence. It is shown through the experiments that our algorithm outperforms the existing mixing algorithms in terms of encryption time and confidence.

기관지 낭종의 전산화단층촬영 소견

조길호,박복환,변우목,조현철,장재천,조재호,이용우,황미수 영남대학교 의과대학 1995 Yeungnam University Journal of Medicine Vol.12 No.2

이 연구의 목적은 기관지낭조의 CT소견을 분석하여 그 특징을 알아보고자 하였다. 수술후 조직학적으로 기관지낭종으로 확진된 11명의 CT소견을 후향적으로 분석하였다. 전 예에서 조영증강 전 수의 CT가 시행되었고 CT상 병변의 위치, 크기, CT 음영과 조영증강 정도, 석회화 유무 등을 중심으로 분석하였다. 총 11 례중 3례는 폐실질내에 8례는 종격동내에 위치하였다. 폐실질내 기관지낭종 3례중 2례는 우하엽, 1례는 좌하엽에 위치하였고, 평균 크기는 9.7cm 이었다. CT상 1례는 공기로만 찬 낭포, 1례는 균질한 물음영의 낭종, 1례는 공기방울을 가지는 고음영의 낭종으로 보였다. 종격동내 기관지낭종 8례중 5례는 후종격동, 2례는 상종격동, 1례는 중종격동에 위치하였으며 평균 크기는 5.0cm 이었다. CT상 5례는 균질한 물음영으로 나타났고, 1례는 공기수면상을 보였으며, 2례는 근육과 비슷한 정도의 고음영으로 나타났고 그중 1례는 65 HU를 보였다. 모든 예에서 석회화나 조영증강은 보이지 않았다. 수술소견상 폐실질내 기관지낭종은 3례 모두에서 낭종내에 지저분한 농양의 액체를 가지고 있었고 종격동내 기관지낭종은 8례 모두에서 희거나 노란색의 점액질 액체를 보였다. 기관지낭종은 균일한 물음영을 보이는 경우가 가장 많으며, 그 외 근육과 비슷산 정도의 고음영, 공기수면상, 공기로만 찬 낭포 등으로 보였으며 이와 같은 소견은 기관지낭종의 진단과 감별에 도움이 될 것으로 생각한다. . We studied to evaluate CT characteristics of bronchogenic cysts. We retrospectively evaluated CT of 11 patients with pathologically proved bronchogenic cyst. Precontrast and postcontrast CT scan was performed in all. We analyzed CT with viewpoints of location, size, attenuation on pre- and postcontrast scan, and calcification. Three of 11 bronchogenic cysts were intrapulmonary in location and eight were located in the mediastinum. Two of 3 intrapulmonary bronchogenic cysts were located in the right lower lobe, and the remaining one was left lower lobe. Intrapulmonary bronchogenic cysts ranged from 6 cm to 12 cm in diameter(average, 9.7 cm). On CT, intrapulmonary bronchogenic cysts appeared as thin-wall air cyst, homogenous water attenuation and soft tissue attenuation with air bubble respectively. Mediastinal bronchogenic cysts were located in posterior mediastinum(n=5), superior mediastinum(n=2), middle mediastinum(n=1) respectively. These cysts ranged in size from 3cm to 8cm in diameter(average, 5.0 cm). On CT, five showed homogenous water attenuation, two soft tissue attenuation similar to that of muscle, one air-fluid level. Calcification or contrast enhancement was not detected in any cases. One operative findings, all of intrapulmonary bronchogenic cysts contained dirty pus-like material and all of mediastinal bronchogenic cysts contained whitish or yellowish mucus material. Bronchogenic cysts showed homogenous water density in many cases, homogenous soft tissue density, air-fluid level and air-filled cyst. The constellation of CT findings may be helpful in the diagnosis and differentiation of bronchogenic cyst.

Chemical Modification of Brain Glutamate Dehydrogenase Isoproteins with Phenylglyoxal

Cho, Sung-Woo,Ahn, Jee-Yin,Cho, Eun-Hee,Lee, Kil-Soo,Choi, Soo-Young The Korea Science and Technology Center 1999 BMB Reports Vol.32 No.5

Incubation of two types of glutamate dehydrogenase isoproteins from bovine brain with the arginine-specific dicarbonyl reagent phenylglyoxal resulted in a biphasic loss of enzyme activity. Reaction of the glutamate dehydrogenase isoproteins with phenylglyoxal caused a rapid loss of 53∼62% of the enzyme activities and modification of two residues of arginine per enzyme subunit. Prolonged incubation of the glutamate dyhydrogenase isoproteins with phenylglyoxal resulted in the modification of an additional four residues of arginine per enzyme subunit without further loss of the residual activities. Partial protection against inactivation was provided by the coenzyme NADH or substrate 2-oxoglutarate. The most marked decreased in the rate of inactivation was observed by the combined addition of NADH and 2-oxoglutarate, suggesting that the first two modified arginine residues are in the vicinity of the catalytic site. However, inactivation of the glutamate dehydrogenase isoproteins by phenylglyoxal appears to be partial with approximately 40% activity remained after an extended reaction time with excess reagent, suggesting that the modified arginine residues may not be directly involved in catalysis. The lack of complete protection by substrates also suggest the possibility that the modified arginine residues are not directly involved at the active site, and the partial loss of activity by the modification of arginine residues may be due to a conformational change. There were no significant differences between the two glutamate dehydrogenase isoproteins in sensitivities to inactivation by phenylglyoxal, indicating that the microenvironmental structures of the glutamate dehydrogenase isoproteins are very similar to each other.

환율의 통화론적 모형에 의한 장단기예측

조우길(Woo Kil Cho),모수원(Soo Won Mo) 한국무역학회 1996 貿易學會誌 Vol.21 No.1

멜론 춘계 포복재배시 품종특성

조용조(Cho Yong-Cho),한길영(Han Kil-Yeong),신정호(Shin Jung-Ho),송근우(Song Geun-Woo) 한국원예학회 1999 원예과학기술지 Vol.17 No.2

마늘珠芽의 化學的 處理와 播種時期가 生育, 收量 및 球의 成分에 미치는 影響

趙鏞祚(Cho Yong Cho),曹宇石(Cho Woo Suk),韓吉永(Han Kil Young),宋根禹(Song Geun Woo),辛元敎(Shin Won Kyo),鄭秉龍(Jeong Byoung Ryong) 한국원예학회 1995 한국원예학회 학술발표요지 Vol.13 No.1

지역경제통합과 원산지규정의 효력

조우길(Woo-Kil Cho),장흥훈(Heung-Hoon Jang) 한국무역학회 2002 무역학자 전국대회 발표논문집 Vol.2002 No.8

換率의 變移性이 貿易에 미치는 影響

조우길(Cho Woo-Kil) 한국항만경제학회 1998 韓國港灣經濟學會誌 Vol.14 No.-

This paper examines the relationships between nominal exchange rate volatility and trade balances as well as the causal relationships between trade balance and exchange rates in Korea. We investigates whether the ARCH conditional variance(exchange rate volatility) has a statistically significant impact on the trade balance. This study also provides the empirical overviews of the trade account and Korean won-dollar exchange rate using integer and fractional cointegration approach. This paper shows that all the fractional estimates of d not only lie between 0 and 1, but are greater than 0, suggesting a mean-reverting bahaviors.

지역경제통합과 원산지 규정의 효력

조우길(Woo-kil Cho),장흥훈(Heung-hoon Chang) 한국국제상학회 2003 國際商學 Vol.18 No.4

In a regional trading blocs of Free-Trade Area(FTA), member countries remove tariffs, but each member determines its own tariff structure towards nonmembers. This create an incentive for nonmember countries to export their goods to high-tariff members via members with low tariffs. To prevent this problem of trade deflection, each member must apply Rules of Origin(ROO), which specify the conditions under which a good may move, duty-free, among member countries. ROO generates distortions in the world trading system via the restrictive impact, but the work of designing global ROO within the framework of WTO is still in its introductive phase. This study explores the possibility of making them to promote the desirable goals of the international community at large. This study suggests employing asymmetrical ROO and cumulation of origin to promote valuable aims for the international community. Asymmetrical ROO may alleviate the problem of asymmetric factor endowments pools, and cumulation of origin could stimulate co-operation and enhance peace and stability in embattled regions as Korean Peninsular.