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과학활동에서의 프로젝트 접근이 유아의 과학적 문제해결력에 미치는 효과
승순화(Sung Sunhwa),김덕건(Kim Duckgun) 한국열린유아교육학회 2003 열린유아교육연구 Vol.8 No.3
본 연구는 과학활동에 대한 프로젝트 접근이 유아의 과학적 문제해결력에 어떠한 효과가 있는지를 알아보기 위해 J도에 소재한 병설유치원 유아 20명을 대상으로 연구하였다. 실험집단은 과학적 주제로 ‘자전거’ 에 대한 프로젝트 활동을 실시하였고 비교 집단은 단원중심 과학활동을 실시하였다. 연구 결과 프로젝트 활동을 한 실험집단이 단원중심 과학활동을 한 비교집단보다 문제해결력에서 유아들의 점수가 더 높은 것으로 나타났다. 따라서 과학활동에 대한 프로젝트 접근이 유아들의 과학적 문제해결력을 신장시키는데 효과적이라고 결론지을 수 있다. The purpose of this research is to recognize what effects of using project approach on children's scientific problem-solving ability. The 20 subjects for this study were selected from kindergarten students in elementary school. The 10 students were placed in the experimental group and the 10 students were positioned in the control group. The study process was as follows: training the subjects, testing the project preparatorily, pre-testing, experimenting, post-testing and processing data. The experiment was conducted with the project on bicycles on the experimental group doing the project practice and on the control group doing a unit-oriented science practice 14 times for 7 weeks. In order to recognize whether the ability to scientifically solve problems was improved, I took the pretest and post-test using t-test. While both the groups proved to be the same group through the pretest, through the post-test the experimental group doing the project practice was proved to get higher scores than the control group doing a unit-oriented science practice. According to the findings, I got the following conclusion: the project approach method which enables children to find problems for themselves, to operate them, to think about them is suitable for improving the ability to solve problems scientifically. And I came to get the thought that researches to find new teaching-learning methods to improve the ability to solve problems scientifically should be performed continually.
Simultaneous uterine adenocaricnoma and leiomyoma with ovarian interstitial cell tumor in a cat
Okjin Kim, Sung-Jin Cho, Sunhwa Hong, Hyun-A Lee, Yung-Ho Chung 충북대학교 동물의학연구소 2012 Journal of Biomedical and Translational Research Vol.13 No.4
A three-year-old Russian Blue female cat was presented for long-standing infertility and recent development of male behavior. From one to three years of age, the cat had been bred, however, pregnancy never resulted. Abnormal enlargement of the uterus and ovaries was observed by abdominal sonography and radiography. An ovariohystectomy was performed. In the uterus, adenocaricnoma lesions were found and characterized microscopically by replacement of the endometrium with a population of large polyhedral cells with a tubulopapillary or nested arrangement and a supporting fibrous stroma with minimal vascularization. In addition, the pedunculated mass was diagnosed as leiomyoma, which was continuous with the myometrium, composed of closely packed sheets of spindle cells embedded in vascularized stroma, and covered with a discontinuous endometrial epithelium. The ovarian neoplasm was diagnosed as an ovarian interstitial cell tumor. Based on the histopathological characteristics, this case was diagnosed as a simultaneous occurrence of an ovarian interstitial-cell tumor and uterine adenocarcinoma and leiomyoma in a female cat. To the best of our knowledge, this report represents a rare case of multiple tumors in the genital organs of a cat.
Effects of onion peel water extracts on swimming endurance in rat
Joon-Ho Choi, Sang-Jun Han, Sunhwa Hong, Sang-Ho Park, Yung-Ho Chung, Okjin Kim 충북대학교 동물의학연구소 2013 Journal of Biomedical and Translational Research Vol.14 No.2
Onion (Allium cepa L.) contains high levels of dietary fibers and antioxidants, including vitamin C, D, and folates. Onion is also known as a quercetin-rich vegetable with high flavonoid content. Onion peel contains over 20 times more quercetin than onion flesh. The aim of this study was to examine the question of whether onion peel extract supplementation has an effect on maximal exercise performance in rat. Onion peel extracts were extracted with hot water. Thirty male Sprague Dawley rats were maintained on a pellet diet for one week, and then randomly divided into five groups: Normal control, Positive control (quercetin 20 mg/kg), Onion peel 4 mg/kg, Onion peel 20 mg/kg, and Onion peel 100 mg/kg. Oral administration was performed daily. The experimental period was four weeks. Thereafter, animals were then forced to swim in water and the maximal exercise performance period from the swimming start time to the exhausted time, in which they failed to rise to the surface of the water to breathe within a 7 second period, was measured. After necropsy, weights of gastrocnemius muscles were measured. Lactate dehydrogenase concentration in serum was measured using an enzymatic method, using a commercial kit. The maximal exercise performance period was significantly longer in the onion peel extracts fed groups, compared with the control group. The lactate dehydrogenase concentration of the onion peel extracts fed groups was significantly lower, compared with the control group. Based on these results, we suggest that onion peel water extract supplementation can enhance exercise capacity caused by the mechanism of decreasing lactate dehydrogenase concentration.