이 연구의 목적은 황산구리를 통해 초등학교 4학년과 6학년 학생들의 물질에 대한 관찰능력과 사전지식 수준 및 종류를 조사하고 비교하여, 초등학교 실험 학습 활동을 위한 학습 자료를 마련하기 위한 것이다. 연구를 위하여 80명의 초등학교 4학년과 6학년 학생들을 대상으로 시범실험을 실시하고, 끝이 열린 질문지로 설문조사를 수행하였다. 연구 결과, 첫 번째, 황산구리 결정보다는 황산구리 가루에 대한 시각과 촉각의 감각기관을 통한 관찰 활동에서 더 많은 학생들이 더 다양하게 관찰을 하였다. 두 번째, 황산구리의 물리적 변화에 대한 관찰 활동에서 4학년과 6학년 학생들의 대부분이 용해 개념에 대한 이해가 부족하였으며, 재결정에 대해서도 다양한 의견을 제시하였다. 세 번째, 황산구리의 화학적 변화에 대한 실험 학습 활동에서 4학년 학생들의 응답이 6학년 학생들의 응답보다 다양했다. 그러나 4학년 학생들의 응답은 화학반응 과정 중의 일부 현상에 한정된 장면 관찰이었고, 6학년 학생들의 응답은 화학반응으로 변화되는 과정을 포함한 과정 관찰이었다. 네 번째, 황산구리의 구조에 대한 예상에서 학생들은 다양한 유형의 구조를 제시하였으나, 아무도 과학적으로 인정되는 구조를 제시하지는 못했다. 그러나 초등학교 학생들이 관찰 활동과 시범 실험을 통하여 나름대로 다양한 형태의 황산구리 구조를 예상하는 것으로부터 초등학교 학생들의 다양한 탐구 능력을 엿볼 수 있었다. 따라서 초등학교 학생들에게 황산구리와 같은 친숙한 학습 자료를 이용하여, 물질 분야의 과학적 개념을 지도하는 실험 학습 활동 중심의 과학교육을 지속적으로 시도해야 할 것이다.

Present study was designed to characterize the concentrations of major roadside air pollutants in Daegu and to compare with those of Seoul and Busan. Evaluated were the exceedance frequence of mean concentrations of target compounds(CO, NO2, O3, PM10, SO2) and the relationship for time variation. Two air pollution monitoring stations(one roadside station and one residential station) in Daegu were selected for this study. In addition, one roadside monitoring station from each of Seoul and Busan was chosen for the comparison of Daegu monitoring stations. The data analyzed in the current study were collected from 1998 to 2000 by Daegu Regional Environmental Management Office. The roadside concentrations of NO2 and PM10 and the exceedance frequency of ambient air standard levels in Daegu were higher than those of Seoul and Busan. Except O3, the roadside concentrations of all target compounds showed following three distinguished patterns; first, possibly due to increased traffic density, the concentrations increased from 0500 to 0900(LST), second, the concentrations decreased from 0900 to 1700(LST) possibly due to the increased wind velocity and decreased traffic density, and finally, increased traffic density, the concentrations increased again from 1700 to 2100(LST). An implication was that major air pollution sources shifted from residential area to road-area during rush hours.

This study investigated the distributive property of micropollutants in sediment around Gwang-yang bay using simultaneous analytical method of 310 chemicals. In the results, the major micropollutants detected were CH type chemicals such as aliphatic, polycyclic compounds, benzenes, and CHN(O) type chemicals aromatic amines, and pesticides. Insecticides of pesticide type were frequently detected at all sampling site. The total concentration of micropollutants were higher in summer than in winter and measured within the range of ND ～ 36.50㎍/L. Also, because of effect of seomjin river, GY6 of all sampling site detected by the highest concentration, GY10 and 11 located in Gwang-yang outside bay were not detected the micropollutants. From the result of this study, we should estimated that the industrial complex located in Gwang-yang inside bay and an inflow of fresh water through the Seomjin river are major pollution sources of Gwang-yang bay.

It was compared the reduction effect of contaminants and odor according to DO change and EM (effective microorganisms) addition in maturation process of piggery slurry. The maturation processes were divided into three cases as follows: R-1 was operated at 2.5 mg/ℓ of DO without the addition of EM, R-2 was operated at 7.5 mg/ℓ of DO without the addition of EM and R-3 was operated at 2.5 mg/ℓ of DO with the addition of EM. The addition of EM was more effective than the increase of DO for the reduction of CODcr, NH3-N and T-N in the maturation of piggery slurry. In addition, the reducing effect of odor intensity appeared high even in the short-term maturation period in case of adding EM and one could not even smell the stimulating odor of piggery slurry.

강변여과는 강물을 강변의 충적대수층에 통과시켜 지층의 자체정화능력을 이용하여 오염물질을 상당량 저감시킨 후 양수하는 방식이다. 국내에서는 대부분의 원수를 지표수에서 취수하여 사용하고 있는 실정이나, 오염물질의 증가로 인하여 지표수를 원수로 사용하기가 점점 어려워지고 있다. 강변여과를 이용하여 양질의 원수를 확보하기 위해서는 오염물 이동에 관한 이해가 중요하다. 본 연구에서는 대수층에 용존성 유기물질(DOM)과 박테리아가 동시에 존재할 경우를 대상으로 대

The effects of pre-treatments by plants growth substances and functional substances on vase life and physiological character of cut Lillium oriental hybrid 'Siberia' and Lillium asiatic hybrid 'Dream Land' were studied. For Lilium oriental hybrid Siberia, the vase life of 1st floret was extended by dip treated with Promalin and spray treated with Dan-solution Ⅱ(Nano colloidal Ag+ ion + Chitosan) and the vase life of 2nd floret was effected by dip treated with Promalin and Dan-solution Ⅱ. In case Lilium asiatic hybrid Dream Land, the vase life of 1st floret was extended by spray treated with Promalin and Dan-solution Ⅱ. The vase life of 2nd floret was increased by dip and spray treated with Promalin and by spray treated with Dan-solution Ⅱ. Water uptake of Siberiawas increased by all pre-treatment but wasn't showed significance. Also water uptake of Dream Land was increased by spray treated with Dan-solution Ⅱ. In case Siberia, fresh weight was increased with Dan-solution Ⅱ and was increased by dip treated with Promalin and by spray treated with Dan-solution Ⅱ in Dream Land. The amount of ethylene production of Siberia wasn't showed significance in all pre-treatment but when floret of Dream Land was treated with Dan-solution Ⅱ, the peak point was showed in 1st day. The respiration rate was showed climacteric rise type by all pre-treatment in Siberia and Dream Landand the peak point was a little decreased by Dan-solution Ⅱ treatment. Sugar contents were remarkably promoted in petal when florets of Siberia was treated with Distilled water and Dan-solution Ⅱ treatments, but were decreased in leaf and ovary. In case Dream Land, glucose content was not showed changes in leaf but fructose content was decreased. Also sugar content of ovary and petal were showed tendency such as Siberia.

본 연구에서는 자료수집과 적용에 상당한 시간과 노력이 요구되는 기존의 수치모형들 대신에 최소한의 유역정보를 이용해 오염물질의 이동시간과 확산을 예측할 수 있는 방법을 제시하고자 하였다. 즉, 하천에서 오염물질의 이동속도, 시간에 따른 오염물질의 첨두농도, 오염물질이 하천의 한 점을 통과하는데 소요되는 시간장경 등의 요소들을 이용한 단위오염도의 개념을 도입하였으며, 이들 요소들의 추정을 위해서는 미국 내의 수많은 하천을 대상으로 개발된 회귀방정식을 이용하