고리 및 영광 논토양에 대한 ^137Cs의 모의 사고 침적시 토양-벼 전이계수

최용호,임광묵,박효국,최희주,이한수 대한방사선 방어학회 2002 방사선방어학회지 Vol.27 No.4

고리 및 영광 원전 반경 5km 내 11곳의 논토양을 원상대로 재배상자에 채취하여 실험 온실로 운반한 후 벼의 이식 전과 생육중에 ^137Cs을 담수의 표면에 처리하였다. 이식전 처리시 ^137Cs의 토양-작물체 전이계수(m²kg^-1-dry plant)는 토양에 따라 8배 정도의 변이를 보였고 평균은 지역간 차이가 거의 없이 쌀알의 경우 1.1 x 10^-4 , 볏짚의 경우 2.7 x 10^-4 이었다. 분얼초기 처리와 수잉기 처리시 전이계수는 이식전 처리에 비해 대체로 2∼3 배 및 15∼30 배 정도 높았다. 토양 유기물 함량과 전이계수 간에는 정의 상관이 있었다. 본 실험결과에 입각하여 우리나라 논에 대한 일회성 사고침적시 적용할 수 있는 ^137Cs 전이계수의 대표치를 침적시기별로 제안하였다. Undisturbed soil blocks were taken into culture boxes from 11 paddy fields within 5 km radii of Kori and Yonggwang NPPs and carried to a greenhouse where ^137Cs was applied to the surface of standing water before rice transplanting and during its growth. Transfer factors (m²kg^-1-dry plant) of ^137Cs applied before transplanting varied with soils by a factor of about 8. The mean was 1.1 x 10^-4 for hulled rice seeds and 2.7 x 10^-4 for straw without significant regional differences. The ^137Cs applications at the early tillering stage and booting stage resulted in, on the whole, 2∼3 and 15∼30 times, respectively, higher transfer factors than the application before transplanting. A positive correlation was found between soil organic matter and transfer factor. Generic values of transfer factors were proposed for an acute accidental deposition of ^137Cs onto Korean paddy fields in different times of the year.

황해에 분포하는 오징어의 어황특성

최광호,조규대,김동선,김주일,김상우 한국수산자원학회 2003 한국수산자원학회지 Vol.6 No.-

황해에 분포하는 오징어는 1981년에 어장이 형성되어 1987년 최고의 어획수준을 보인 후 감소하여 1989년까지 어장이 형성되었다. 주어기는 8∼9월로 연간전체어획량의 60% 정도를 차지하였으며, 동해에 비하여 주어기가 짧게 나타났다. 월별 어장분포에 기초한 어군의 회유는 4월에 북상하여 11월에 남하하였으며, 서해에서 수온의 상승과 하강 시기와 잘 일치하였다. 서행에서 오징어 주어기인 8월과 10월의 수온전선대는 남북으로 길게 형성되었지만, 어황이 좋았던 1987년은 동서로 형성되어 어군의 밀집에 유리한 수온장벽의 역할을 하였다. 오징어의 동장조성은 6월에 16-23㎝의 범위로 평균 18.7㎝에서 12월 21-31㎝의 범위로 평균 26.0㎝를 나타내어 월의 이행과 함께 어획되는 오징어의 평균동장은 점차 증가하였다. In the Yellow Sea, the fishing ground of squid was formed from 1981 to 1989. Main fishing season was from Septembr to October, caught 60% of annual catch. The distribution periods of the squid in the Yellow Sea were short compared to those in the East Sea. due to retaining period of optimumal temperature. Squid migrated northward in April and southward in November. Because the migration pattern of squid related to a rise and drop time of water temperature. The catch of squid related to the forming direction of thermal fronts. The thermal front was formed in the south-west direction which runs parallel to the coast from August to October in normal year. But the catch was relatively high when the thermal front was formed in the east-west direction from August to October in 1987.

다양한 함불소가스들의 고비점 용매에 관한 용해도 측정 및 엑막에 의한 분리

최평호,이상학,김철웅,김범식,김광주,이정민,박인준 한국공업화학회 2002 응용화학 Vol.6 No.2

The solubility of various fluoro-gases in high boiling-point solvents, n-Cnh_2n+_1OH(6<n<10)and ionic liquids(+ ions: 1-Buty 1-3-methy1-imidazolium, 1-Ethy1-3-methy1-imidazolium, - ions:BF_4, PF_6, S_6F_6, F_6O_4S_6) were measured at temperatures from 0 to 30℃, at total pressures up to 4 bat Solubility increased significantly with the decrease of n in n-Cn_2N+OH and showed no such a difference in the types of ionic liquids, Especially, the solubility of R22 gas in these solvents increases rapidly with increases in pressure and decreases in temperature, whereas other fluoro-gases were showed a little solubility Liquid-supported membranes were prepared with these solvents and polymer matrix and were applied to the separation of fluoro-gases including R22 gas. A high permeability and selectivity were exhibited in R22 gas against other fluoro-gases.

韓國産 다람쥐의 結核菌 崔少 感染量에 關한 硏究

崔大卿,柳駿,金周德,金聖光,邊于燮 연세대학교 의과대학 1972 연세의대논문집 Vol.5 No.1

Gd₂O₃-doped CeO₂의 소결성에 미치는 Gd₂O₃의 첨가효과

최광훈,이주신 경성대학교 공학기술연구소 2003 공학기술연구지 Vol.10 No.-

The effects of Ga₂0₃ additions on sintering behavior of Gd₂0₃-doped CeO₂ were systematically investigated from the following aspects: the variation in sintered density, the variation in grain size, and the forms and existence position of Ga₂0₃ in Ce0₂. Sintered density increased up to 5 mo1% Ga₂0₃ addition, and then it decreased. Grain size increased up to 5 mo1% Ga₂0₃ addition also. Over 5 mol% Ga₂0₃ addition, grain size was decreased by a pinning effect of Ga₂0₃ precipitation at grain boundary. Lattice constant decreased with increasing Ga₂0₃ content up to 5 mol%. This decrease will be due to the substitution of smaller Ga^(3+) ions for Ce^(4+) ions in the Ce0₂ structure. According to the results obtained from SEM and XRD analyses, the solubility limit of Ga₂0₃ in Ce_(0.8)Gd(0.2)0_(1.9) ceramics can be estimated to be nearly 5 mol%. The addition of Ga₂0₃ up to solubility limit was found to promote the sintering properties.

소수성 촉매를 이용한 수소동위원소 교환 반응 측정을 위한 순환 반응기

최희주,이한수,안도희,강희석,김광락 한국공업화학회 2002 응용화학 Vol.6 No.2

The catalytic rate constants of hydrophobic catalysts developed for the removal of tritium mainly generated in the pressurized heavy water reactors should be measured. A recycle reactor was designed and built for characterzing the long-term behavior of the catalyst performance at the various temperatures and gas velocities.The catalytic rate constants were measured at the apparent gas velocity of 0.5 m/s and the temperature of 60℃. The initial catalytic constant was 8.44×10^-4mol/g.sec. This value is much greater than that considered in the design of Wolsong Tritium Removal Facility.

Strontium gallate의 첨가에 따른 Gd_(2)O_(3)-doped Ceo_(2) 세라믹스의 소결특성

최광훈,이주신 경성대학교 공학기술연구소 2004 공학기술연구지 Vol.11 No.-

The densification behavior of Ce_(0.8)Gd_(0.2)O_(1.9) ceramics was investigated with the strontium gallate concentration ranging from 0 to 5 mol%. Sintered density was the highest at the specimen containing 0.5 mol% Sr_(2)Ga_(2)O_(5). 0.5 mol% Sr_(2)Ga_(2)O_(5)-added specimen had the relative density of 97%. Overall, sintered density of specimens containing Sr_(2)Ga_(2)O_(5) was higher than that of pure specimen. Sr_(2)Ga_(2)O_(5) addition gave good effect on sinterability of Gd_(2)O_(3)-doped CeO_(2).

High energy milling process에 의한 Gd₂O₃-doped CeO₂의 소결성 증진

최광훈,이주신 경성대학교 공학기술연구소 2003 공학기술연구지 Vol.S1 No.2

Gd₂O₃-doped CeO₂ powders with Ga₂O₃ addition were prepared by ball milling and high energy milling, respectively. The powders prepared by high energy milling showed the particle size of average 0.52 μm and narrow particle size distribution than ball milled powders. The specimens prepared by high energy milled powders showed higher sintered density than ball milled specimens. Also, the specimens containing 0.5 mol% Ga₂O₃ had the highest relative density of 97%, but it decreased with further addition of Ga₂O₃.. High energy milling process and Ga₂O₃ addition gave good effect on sinterability of Gd₂O₃-doped CeO₂.

안전한 감사 로깅 시스템을 위한 논리적 모델 설계

주광로,최성복 서강정보대학 1996 論文集 Vol.15 No.-

As the development of infocommunicational technologies and the increase of computer utilization have accelerated the information-oriented society, the security problem of information systems is getting a growing interest and the importance of regulations and procedures for the security problem is increasing. Information systems have to secure the auditability in order to prevent the illegal leakage of information and to track down the violators of control principles. And they also need an audit trail mechanism in order to clarify the information system managers' liabilities and to visualize those users' behaviors. Fundamentally, the audit trail is used as a method for the statistical accountability that tracks down who used which resources in what time and in which order and for the claim of using charge, the maintenance of statistics, the backup and so on. Recently, with the addition of security issues that supervise and log the inappropriate use of system resources, how to track down the illegal access to the information system has become the main issue. In order to construct the audit trail mechanism as above-mentioned, this study proposes a logical model for safe audit logging system based on UNIX system, according to the utility, the security and the perpetuity of audit log and the implantation onto the existing systems.

방울토마토중 Dichlofluanid 및 Iprodione의 생산단계별 잔류농약 경시변화

최규일,성기용,정태균,이주환,허장현,고광용,이규승 한국환경농학회 2002 한국환경농학회지 Vol.21 No.4

방울토마토의 생산단계에서의 잔류허용기준 설정과 수확후 저장기간중 경시변화 및 세척에 의한 잔류농약의 감소양상을 파악하였다. 해당약제를 안전사용기준의 기준량 및 배량을 각각 시설재배 포장에서 살포후 10일간 잔류양상을 조사하였고, 실온 및 냉장조건 하에서의 저장실험 및 세척에 따른 전류농약의 잔소량을 파악하여 생산단계부터, 출하, 저장, 소비단계까지의 잔류량을 예측할 수 있는 모델개발을 위한 자료로 이용하고자 연구를 수행하였다. Dichlofluanid와 iprodione은 포장조건에서 반감일수가 기준량 2.2, 3.3일 이었으며, 배량은 3.5, 5.4일로 나타났다. 저장조건하에서의 약제별 반감기는 포장조건보다 잔류량의 감소속도가 느린 것으로 나타나 반감일수가 증가하였고, 세척방법에 의한 잔류농약의 감소량을 조사한 결과 세제 사용시의 평균제거율은 dichlofluanid는 73.7%, iprodione은 64.3%로 나타났고, tap-water 사용시에는 dichlofluanid 73.5%, iprodione 63.5%로 나타났다. 이러한 결과는 작물의 생산단계에서 구한 합리적인 희귀식을 이용하여 잔류농약의 경시변화를 파악하고, 저장 및 세척과정을 거쳐 최종 소비단계에서의 잔류농약의 수준을 평가할 수 있었다. We studied the residual patterns of two fungicides, dichlofluanid and iprodione, in cherry tomato greenhouse after applying with the recommended and double dose. Also, the degradation patterns during storage periods of up to ten days were compared between at room temperature (20℃) and at cold temperature (4℃). Removal rates of fungicides by washing with tap-water and detergent solution (0.1%, 0.2%) were measured. Half-lives of dichlofluanid and iprodione in greenhouse cherrytomato were 2.2~3.5 and 3.3~5.4 days, respectively. During the storage period, the residues were dissipated more slow. Removal rates were 62.8~80.3% by tap-water, 60.4~83.1% by 0.1% detergent solution, and 65.3~77.6% by 0.2% detergent solution. So, we can predict of terminal residues from cultivation period to marketing, storage and consuming.