Today travel demand continues to increase with spread of economic zones. Also, urban freeway plays an important role in intra-zone transportations as a major corridor in a big city. However, most of urban freeways experience a severe congestion with the excess of inflowing or outflowing traffic through freeway ramps. The purpose of this study is to identify the traffic characteristics, analyze the relationships between the traffic characteristics and finally construct the speed predictive models on the ramp junctions of urban freeway under the intelligent transportation system(ITS) settings. From the analyses of traffic characteristics following results were obtained: ⅰ) 24 hours average traffic characteristics flow, occupancy, speed under the ITS settings showed about 40%, 38%, 8.8% increase each on urban freeway junctions period when compared with that under the non-ITS settings each other. Free flow speed and traffic flow on the mainline sections of urban freeway under the ITS settings also showed about 20% and 17% increase when compared with that under the non-ITS, respectively. ⅱ) The upstream when compared speed( Su)and downstream occupancy( Od) were especially shown to have higher explanatory powers on the stable flow ramp junctions, but the upstream speed( Su) and downstream flow( Vd) were especially shown on the unstable flow ramp junctions of urban freeway under the ITS settings.ngs.ngs.

암컷 미꾸라지, Misgurnus mizolepis와 수컷 미꾸리, M. anguillicaudatus간 잡종과 잡종 3배체를 생산하였으며, 잡종화 및 잡종 3배체화가 망막, 시개 및 trunk kidney에 미치는 영향을 조직학적으로 조사하였다. 잡종은 일부 조직의 핵과 세포 크기에서 양친과 거의 유사하였다. 잡종 3배체는 잡종에 비해 적혈구 세포 및 핵 크기, 망막 내과립층 horizontal cell 핵 크기, 망막신경절 신경세포 층의 신경세포,

Nine districts in Seoul were chosen randomly and a questionnaire containing 23 questions was distributed to survey the perception of noise pollution by the citizens. The results were primarily analyzed to understand the perception of Seoul citizen as a whole, and then analyzed according to 4 demographic variables -district area, age, gender and occupation -to see if there were any possible relation between nonnoise variables and noise annoyance. Actual noise level data measured by the city government were used to compare quantified noise level with the surveyed people`s perception. It was found that people consider road traffic noise to be the main source of noise pollution in Seoul and that most people have experienced annoyance in everyday life. Also it was verified that the responsibility for noise control should be on both city government and the individuals, but it was generally considered that very little effort is actually put into solving noise pollution from both groups. From the survey, it could be analyzed that demographic variables do affect people in the awareness of noise pollution, and that one`s sensitivity and annoyance due to noise increase as one ages. From the study, it was concluded that noise pollution is not considered currently as a hazardous problem to most Seoul citizens, however specific noise reduction policies, especially regarding road traffic noise, should be put into practice in the near future.

유전자원의 장기 안전보존 관리의 기초자료를 얻고자 농촌진흥청 종자저온 저장실에 보관되어 있는 수도 품종중 저장기간이 96, 86. 55, 20개월된 일반계 3품종, 다수계 1품종 모두 4품종을 공시하고 저장조건에 따른 발아력을 30~32℃ 와 15~17℃ 에서 시험 조사한 결과를 요약하면 다음과 같다. 1 저장온도에 따른 발아율은 30~32℃ 의 발아적온에서는 공시품종 모두 89 % 이상이었고 15~17℃ 의 저온에서도 통일을 제외하고는 80 % 이상의 발아율을 보였으며 평균 발아일수 및 발아계수도 저장온도에 따른 차이는 인정할 수 없었다. 2. 저장기간에 따른 발아는 30~32℃ 의 발아적온에서는 발아율, 평균 발아일수 및 발아계수의 차이가 없었으며 15~17℃ 의 저온에서는 저장기간이 길수록 평균 발아일수가 길었고 발아율 및 발아계수가 낮은 경향이었으며 다수계품종(통일)이 일반계품종에 비하여 저온에서의 발아율이 낮았다. 3. 저장기간이 길수록 이당 발아 개체의 출현율이 높은 경향이었다. 4. 저장시 종자내 수분 함량이 높고 공기유통이 되지않는 용기(polyethlene)의 밀봉저장에서 발아력의 상실이 빨랐다.