알파분광법에 의한 의 정량방법을 검토하였다. 황산염 매질에서 전류세기, 전착시간 및 유기물 첨가제 둥의 변화에 따른 의 전착조건을 찾은 결과 A에서 유기첨가제 없이 시간 동안 전착하는 것이 효율적이었다. 을 4.16 Bq에서 0.0264 Bq(1ng) 까지 전착한 결과 농도가 낮을수록 전착율 및 재현성이 낮아졌으며 1 ng 까지 측정이 가능하였다. 사용후 핵연료 합성용액에서 을 분리한 후 알파분광법으로 측정하여 정량한 결과 (n=4)의 회수율을 나타내었다. 사용후 핵연료 시료용액 중 을 정량하였으며 계산 값과 비교한 결과 10% 이내에서 서로 일치하였다.

Cyclooxygenase- 2 (COX-2) is an inducible enzyme that is not found in normal conditions,. but is induced by a varie ty of pathophysiologic conditions of tissues by growth factors. inflammatory stimuli. oncogenes and tumor promoters, COX-2 is upregulated in a number of epithelial cancers. including in oral premalignant and malignant lesions, The mode of action of COX-2 in carcinogenesis may include mutiple mechanisms that may be acting at different stages of malignant disease, In this study. the expression of COX- 2 protein was assessed quantitatively 없d qualitatively by immunohistochemistry during DMBA-induced hamster buccal pouch carcinogenesis, The immunoreactivity for COX-2 protein increased as the tissue passed from hyperplasia to dysplasia and SCC, The highest mean expression was SCC at 14 week, The differences between COX-2 expression in the normal and that the dysplastic and carcinomatous lesions was statistically significant, In addition. the mean values of COX -2 expression in the stromal cells increased gradually during malignant progression, The results suggest that increased COX-2 expression may be associated with the chemically induced carcinogenic progression of hamster buccal pouch model, The gradual increasing COX-2 expression de tected during the progressive manner toward more malignant lesions shows that the COX-2 protein can have an important role in both the early and the later stages of multistep oral carcinogenesis

Amino acid transporters play an important role in supplying organic nutrient to cells. The expression of L-type arnino acid transporter 1 (LATl) and its subunit 4F2 heavy chain (4F2hc) was evaluated to deterrnine the alterations to these transporters in oral norrnal mucosa (ONM) , oral precancerous lesion (OPL) and oral squamous cell carcinoma (OSCC). Sections from formalin-ftxed, paraffm-embedded S따nples of ONM, OPL or OSCC were exarnined using immunohistochernical staining to detect LATl and 4F2hc proteins. 까le LATl and 4F강lC expression increased progressively from ONM to hypeφ，Iastic and to dysplastic lesions and OSCC. In partiαlar， LATl rnay be a more S야dftc indicator of tumor prog~않sion than 4F2hc. 까le gradually increasing LA Tl and 4F2hc expression detected during the multistep progressive change shows that the protein rnay have an important role in the early stages of multistep oral carcinogenesis. In addition, the specific inhibition of LA Tl and 4F2hc rnight be a new rationale to suppress oral cancer progression.

A survey on the preferences and notion about kimchi and kimchi products was conducted from july to october, 1999 to investigate basic information for increasing the consumption of kimchi for sale. 1,241 subjects of women and men aged 10 to 60 in Kyung-nam area participated in this survey. Most of the subjects made kimchi by themselves at home but this rate of making kimchi at home became lower than past, so increment of consumption of kimchi for sale will be expected in the future. When the people buy kimchi, they considered taste first, and then hygiene, nutrition in order. When they purchase kimchi, more men (69.1%) than women(56%) considered taste, but more women(36.1%) than men(20.6%) considered hygiene first. Subjects aged 30 or older groups considered more the hygiene of kimchi than the subjects of 10~20 age groups did.(p〈0.05) And people of household income over 3 million wons considered more hygiene than people of below 1 million wons income group did. People liked manufactured kimchi the packed with whole or partly transparent material in order to observe the contents.(p〈0.05) They liked better kimchi packed with bottle(46.1%) and vinyl(39.6%) than plastic(14.3%) and this tendency was more in the subjects of women(49.8%) and over 30 age groups.(p〈0.05) They prefered 200~500g packing unit of kimchi whether the family size were big or small. Among the processed kimchi products, men liked better a rice covered up with kimchi, a pot stew with kimchi or a soup with kimchi, On the other hand, women liked better a dumplings with kimchi, a grilled food with kimchi, a pizza with kimchi.(p〈0.05) Subjects aged 10 to 20 years old liked all kinds of kimchi products, but people aged 40 or older disliked them.(p〈0.001)

A survey on the preference of kimchi and actual amounts of kimchi intake conducted from july to october 1999 to get basic information needed for the augmentation of kimchi intake. Total 1,241 of women and men aged 10~60 in kyung-nam area participated in this survey. Except people aged 20~30, all of subjects, especially in people aged 60 and over, liked fresh prepared kimchi best, and then fermented kimchi. But all of subjects disliked over fermented kimchi.(p〈0.001) And women(4.3±0.9) liked better fresh prepared kimchi than men(4.2±1.0), men(4.0±0.9) liked better fermented kimchi than women(3.9±1.1).(p〈0.05) In subjects aged above 40, as age grow up, the preference of fermented kimchi and over fermented kimchi grew lower. All of subjects best liked chinease cabbage kimchi, and then chonggak kimchi, kakdugi, yeulmu kimchi, dongchimi in order. And women liked better nabag kimchi, yeulmu kimchi, sesame leaf kimchi, bek kimchi, cucumber kimchi, godulppegi kimchi than men and men liked better chinease cabbage kimchi, kakdugi, dongchimi than women.(p〈0.05) People aged 10~20 and above 60 disliked chonggag kimchi. The preference of kakdugi were high in people aged 10~20, but as age grow up, the preference of kakdugi became lower.(p〈0.001) The preference of nabak kimchi and dongchimi with juice were significantly high in people aged 60 and over but people aged 10~20 disliked. Also subjects aged 10~20 disliked significantly yeulmu kimchi, sesame leaf kimchi, green onion kimchi, bek kimchi, cucumber kimchi, mustard leaf kimchi and godulppegi kimchi and subjects aged 20~30 disliked significantly yeulmu kimchi, mustard leaf kimchi, godulppegi kimchi(p〈0.001). But subject aged 30 and older liked all kinds of kimchi. The amounts of kimchi intake in Kyung-nam area were same level of average amount(100g) of korean intake but the amounts of kimchi intake of men(106.4±74.0) were more than women(96.9±69.5)(p〈0.05)

BaO.Nd2O3.4TiO2세라믹스에서 Bi 치환위치 및 Bi 치환 량에 따른 상, 미세구조, 마이크로파 유전특성 등을 조사하였다. BaO.Nd2O3.4TiO2 세라믹스의 Nd 치환되어 BaO.(Nd1-xBix)2O3.4TiO2고용체 (0≤x≤0.2)를 형성하였다. BaO.(Nd1-xBix)2O3.4TiO2에서 Bi 치환 량이 x=0에서 x=0.2까지 증가됨에 따라 입자크기가 계속 증가하였으며, 유전상수는 84에서 108까지 계속 증가하였고, 공진 주파수의 온도계수는 44 ppm˚C에서 -30ppm˚C로 계속 감소하였다. BaO.(Nd1-xBix)2O3.4TiO2조성에서 Bi 치환 량이 x=0.04에서 0.08사이일 때 가장 양호한 마이크로파 유전특성이 얻어졌으며 이 때의 유전상수 (εr)는 89~92, Q, f는 5855-6091 GHz, 그리고 공진 주파수의 온도계수 (τf)는 -7.7-7.5 ppm/˚C이었다.

Sn-rich합금의 석출 현상을 조사하였다. 첫째, 대기중과 진공 중에서 용해된 90Sn-o10Bi(wt%)합금을 140˚C에서 용체화 처리한 후 석출반응을 조사하였다. 90Sn-10Bi(wt%)합금은 불연속 석출(DP)현상을 나타냈다. 공기 중에서 용융된 시료의 DP반응이 진공 중에서 용융된 시료보다 빠르게 진행되었다. 이것은 공기 중에서 용융하는 과정에서 시료에 용존된 산소에 의해 입계 에너지가 감소한 것에 기인하는 것으로 판단된다. 둘째, 용융 후 서냉 응고된 Sn-Bi(-In)합금을 140˚C이하의 온도에서 열처리하여 미세조직 변화를 조사하였다. 명확한 고경각 입계가 존재하지 않는 응고조직에서, 편석영역으로부터 DP반응이 진행되어 석출셈이 형성되었다. DP반응선단에는 반응계면이 관찰되었다. 이 현상은, 이제까지 알려진 바와는 다르게, DP반응이 반응 전에 존재하는 고경각 입계뿐만 아니라 재결정현상에 의해 새로운 석출계면이 생성될 수 있음을 의미한다. 이러한 재결정 현상은 확산에 의한 정합변형(coherency strain)으로 설명된다.

Cu-brazed layer between the sintered-cam(Fe-5Cr-lMo-0.5P-2.5C, wt%) and seamless steelpipe(0.25-0.35C, 0.3-1.0 Mn, bal Fe, wt%) in the camshaft shows a columnar structure of -phase growing from the steel pipe. Liquid phase sintered 60Fe-40Cu alloys are carburized to simulate the brazing process giving rise to the columnar growth. Liquid film migrations and columnar growth of -grains are observed in the carburized regions. The -grains grow in the same direction as the C-diffusion. Fe-solubility in the liquid of carburized region is higher than in the uncarburized by about 0.3 at%. The columnar growth is driven by the gradient of the supersaturated Fe-solute in the liquid between two adjacent -grains.