In this study, the regional frequency analysis is used to determine each subbasin drought frequency with reliable monthly precipitation and the L-Moments method which is almost unbiased and has very nearly a normal distribution is used for the parameter estimation of monthly precipitation time series in Nakdong river basin. As the result of this study, the duration of '93-'94 is most severe drought year than any other water year and the drought frequency is established as compared the regional frequency analysis result of cumulative precipitation of 12th duration months in each subbasin with that of 12th duration months in the major drought duration. The Linear regression equation is induced according to linear regression analysis of drought frequency between Nakdong total basin and each subbasin of the same drought duration. Therefore, as the foundation of this study, it can be applied proposed method and procedure of this study to the water budget analysis considering safety standards for the design of impounding facilities large-scale river basin and for this purpose, above all, it is considered that expansion of reliable preciptation data is needed in watershed rainfall station.

In this study, the Dilution Method is used to measure river discharge through the hydraulic model test. the dilution method is divided into Constant-Rate-Injection Method and Slug-Injection Method in the river discharge measurement techniques. When the dilution method is applied in the hydraulic model flume, it is analyzied that the estimated error of constant-rate-injection method is less than that of the slug-injection method, and the result shows that floodflow analysis is more efficient than lowflow analysis as compared observed discharge with calculated discharge. The result of statistical error analysis shows that the constant-rate-injection method is appropriate technique for the measurement of the river discharge. Therefore, the dilution method among the river discharge measurement techniques can be applied for the river basin which can`t be measured with current meter or unsteady-flow regime in the urban-small drainage or hydraulic structure equipment area and can be obtained more exact results than any other discharge measurement techniques.

본 연구(硏究)는 율무 주산단지(主産團地)인 연천 지역(地域)에서 율무에 피해(被害)를 주는 조명나방에 대한 발생생태(發生生態)를 조사(謂査)하여 방제(防除) 기초자료(基礎資料)로 활용(活用)하고자 조사(調査)한 결과(結果)는 다음과 같다. 1. 율무조명나방은 연간(年間) 3회(回) 발생(發生)하였으며, 1화기(化基)는 5월 중순(中旬)~6월 하순(下旬), 2화기(化期) 7월 하순(下旬)~8월 중순(中旬), 3화기(化期) 8월 하순(下旬)~9월 중순(中旬)이었으며 3화기(化期) 유충(幼蟲)이 율무 그루터기나 줄기측에서 월동(越冬) 후(後) 이듬해5~6월(月)에 번데기 로 되었다. 2. 유충(幼蟲) 월동(越冬) 부위(部位)는 지상부(地上部)에서 68.4%, 지제부 이하(以下)에 31.6%가 분포(分布)하였고 지상부(地上部) 식물체중(植物體中) 1절§in4절까지 분포(分布)하였다. 3. 조명나방의 각(各) 태별(態別) 소요기간(所要期間)은 난기간(卵基間) 3~4일(日), 유충기간(幼蟲期間) 16§in36일(日), 용기간(踊期間) 4~11일(日), 성충(成蟲)의 수명(壽命)은 6~12일(日)이었다. 4. 율무 조명나방의 시기별(時期別) 율무 식물체가해부위(植物體加害部位)는 6月까지 잎, 7月 이후(以後)는 줄기를 식해(食害)하는 것으로 나타났다. 5. 율무 조명나방에 의한 율무 피해(被害)은 7월부터 나타나기 시작하여 9~10월(月)에 피해경율 33.7~37.6%로 가장 높았다.

포유류 배아발생 중 DNA 메틸화는 세포분화와 유전자발현에서 중요한 역할을 하는 것으로 알려져 있다. 그러나, 생쥐 착상전 초기배아 발생 중 메틸화효소에 의해 유지되는 DNA 메틸화의 중요성과 자세한 기작은 잘 이해되고 있지 않다. 이 연구에서 DNA 메틸화의 역할에 관하여 알아보기 위하여, 성숙난자와 착상전 초기배아에서 DNA 메틸전이효소의 발현양상을 조사하였다. 이를 위해, DNA 메틸전이효소를 암호화하고 있는 cDNA에서 primer를 고안하였다.

This study is aimed at the development of the adequate sediment yield formulas in Wi-Stream basin ; IHP representative basin in Korea. As a result of applying outstanding sediment yield formulas among the existing formulas. It is analyzed that including the Engelund & Hansen formula, Yang formula is proper to the Wi-Stream basin. And as a result of sensitivity analysis to the sediment parameters it is analyzed that Rijn and Ackers & White formula is more sensible than any other formulas which has been applied the velocity and depth among the parameters. Also, Engelund & Hansen and Yang formula is less sensible than any other formulas. In Wi-Stream basin, it is analyzed that Yang and Engelund & Hansen formula is the most suitable sediment yield formula in this study. But because the existing formulas had been developed in foreign countries and applied the foreign natural rivers and reservoirs, it makes careful use of Korean alluvial river and hoped that it will be developed the most adequate formula in Wi-Stream basin.

The objectives of this study is to evaluate the total runoff yield, peak flow and peak flow travel time depending on the urbanization, return period and rainfall patterns at the downstream of Manchon urban watershed in TaeGu City. SWMM(Storm Water Management Model) is used for runoff analysis based on 5 different steps of urbanization and 4 different types of Huff`s quartile according to 8 return periods. It is analyzed that the order of total runoff yield according to rainfall patterns is Huff`s 4, Huff`s 2. Huff`s 3 and Huff`s 1 quartile, that of peak flow magnitude is Huff`s 2, Huff`s 1, Huffs`4 and Huff`s 3 quartile at present development ratio. under the 60, 70, 80 and 90% of urbanization to the 50% of urbanization by means of the rainfall patterns, the mean increasing ratio of total runoff yield for each case is 4.55, 11.43, 16.07 and 20.02%, that of peak flow is 5.82, 13.61, 17.15 and 18.83%, the mean decreasing ratio of peak flow travel time is 0.00, 2.44, 5.07, and 6.26%, the mean increasing ratio of runoff depth is 4.51, 11.42, 16.02 and 20.05%, respectively. the mean increasing ratio of total runoff yield by means of each return period & Huff`s 3 quartile is 4.86, 12.11, 17.14 and 21.56%, that of peak flow is 5.89, 13.97, 17.82 and 19.71%. Therefore, as the result of this study, it can be used for principal data as to storm sewage treatment and flood damage protection planning in urban small watershed.

To study the function and structure of Golgi apparatus in the spermiogenesis of long-fingered bat (Miniopterus schreibersi fuliginosus), the testis obtained from adult bat was treated with the prolonged osmification or fixed with ferrocyanide reduced osmium. golgi apparatus was oval shape in early Golgi phase, and was composed of cortex and medullar enclosing acrosome in mid Golgi phase. The vesicles of crescent shape Golgi apparatus were closed or fused with small or large vesicles at the periphery of acrosome. Golgi apparatus moved behing the acrosome face in cap phase, but the Golgi apparatus was still active. According to this, Golgi apparatus appears to be involved in the formation of acrosome and sperm tail. Transfer of materials from Golgi to acrosme seems to be carried out not only by fusion of large vesicles with acrosomal vesicles but also by detachment of coated vesicle from various cisternae of Golgi fusing with acrosomal vesicle.

To investigate the process of spermiogenesis of the Korean eastern Daubenton's bat, Myotis daubentonii ussuriensis, the testis obtained from mature male bats was studied by transmission electron microscope and were based on the variety and diagnostic characters of cell organells. The results obtained from the present study are as follows. According to the differentiation of the cell organells, the spermiogenesis of the Korean eastern Daubenton's bat, M. d. ussuriensis, was divided into Golg, cap, acrosome, maturation and spermiation phases. Besides, these Golgi, cap, acrosome, and maturation phase were subdivided into the steps of early and late phases repectively and matruation phase was subdivided into step of early, mid and late phases. Therfore, the spermiogenesisof M. d. ussuriensis has been divided into a total of 11 phases. The chromatin granules began to condense at the early cap phase, regularized at the acrosome phase, and a perfect nucleus of sperm was formed at the maturation phase. The chromatoid body was occurred in the upper cytoplasm of nucleus at the early Golgi phase, and it was accurred the posterior cytoplasm of the nucleus at the early maturatio phase. The formation of sperm tail began to be develop in the early golgi phase, and completed at the spermiation phase. The fiber structure of middle piece was consisted of nine outer doublets and two central singlet microtubules and Nos. 1, 5, 6 and 9 in the outer dense were larger than the others(2, 3, 4, 7, 8).