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Skemp 이론에 기초한 놀이학습 프로그램이 수학학습능력과 수학적 태도에 미치는 영향
정찬식,정영옥 진주교육대학교 초등교육연구소 2005 科學敎育硏究 Vol.28 No.-
This study aims to facilitate play-activities in 6-Ga stage primary school mathematics curriculum through developing play-activities program based on Skemp's theory and analyzing its effects on mathematics learning abilities and mathematical attitudes of students in the primary school. In order to work out these questions, this study adopted pretest-posttest control group design in quasi-experimental designs. The subjects of study were 68 students attending the J primary school in Jinju city. The newly developed program was applied to the experimental group, while the current mathematics textbook was implemented to the control group. Based on the results of the experiment, the following conclusions were drawn. Firstly, the developed play activities program based on Skemp's theory were consisted of 25 play-activities which can be classified in 4 types of play activity such as concept formation, principle discovery, skill practice and problem solving. Secondly, it proved that the developed play-activities program based on Skemp's theory was more effective to higher level of student than other average and lower level of students. Thirdly, the developed play-activities program based on Skemp's theory was more effective than the one in school now for improving mathematical attitudes. In conclusion, the developed play-activities program based on Skemp's theory has positive effects on improving students' mathematics learning abilities and mathematical attitudes.
Chan Sik Jung,Ju Hyun Kim,Sang Hyun Koh,Yeong Jin Chung,Sang Chul Shin 한국응용곤충학회 2009 한국응용곤충학회 학술대회논문집 Vol.2009 No.10
Monochamus alternatus and M. saltuarius were reported as the vectors of Bursaphelenchus xylophilus, pine wood nematode in Korea. According to Kwon et al. (2006), each of 2 species has occupied their own regional distribution : M. saltuarius in southern part including Jeju island and M. alternatus in mid-northern part of Korean peninsula. We measured the supercooling point (SCP) of 2 species (laboratory-reared populations) by each of developmental stages. The SCPs of 2nd, 3rd and 5th instar larvae of M. saltuarius were -7.68±0.19℃, -7.02±0.69℃, -4.93±1.34℃ each of stages. On the other hand, the SCPs of 3rd, 4th, 5th instar larvae and pupae of M. alternatus. were -4.46±1.12℃, -5.94±1.33℃, -7.83±1.44℃, -9.53±1.78℃ each of stages. The SCPs of M. saltuarius larvae generally was lower than that of M. alternatus. The pupae of M. alternatus and 2nd instar larvae of M. saltuarius had the lowest SCP among measured samples. On the other hand, the highest SCP were recorded in 2nd and 5th instar larvae, each. This result shows that regional distribution of 2 beetles may be associated with the adaptation capacity to low temperature represented by the SCP as well as the developmental temperature. However, beetles experimented were not collected from pine forest fields. In further study, we are planning experiments with field populations and all developmental stages.
Copper Schottky Contacts to Oxygen-plasma-treated n-type Ge
Chan Yeong Jung,김세현,김호경 한국물리학회 2015 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.66 No.8
Using current−voltage (I −V ) measurements, we investigated the effect of oxygen plasma treatment on the electrical properties of Cu/n-type Ge Schottky contacts. Compared to untreated n-Ge, oxygen plasma was found to produce a higher (lower) barrier height and a lower (higher) ideality factor at a plasma power of 100 W (250 W). Compared to untreated n-Ge, the series resistance was decreased at low plasma power and increased at high plasma power, which was associated with the removal of the native oxide layer and the induced defects near the Ge surface, respectively. The smaller variations in the electrical parameters for oxygen-plasma-treated n-Ge suggest that oxygen-plasma treatment improved the homogeneity of the Schottky barrier’s interface. Our results suggest that optimized oxygen plasma can be used as a pretreatment method before depositing a thin insulating layer.
( Seong-chan Jung ),( In-young Kim ),( Shin Jung ),( Tae-young Jung ),( Kyung-sub Moon ),( Yeong-jin Kim ),( Sue-jee Park ),( Kyung-hwa Lee ) 대한뇌종양학회·대한신경종양학회·대한소아뇌종양학회 2024 Brain Tumor Research and Treatment Vol.12 No.1
We report a patient with whole neuroaxis dissemination of a sporadic supratentorial hemangioblastoma (HB) for more than 15 years. A 68-year-old female patient presented with severe radiating pain in the right leg. Gadolinium-enhanced lumbar spine MRI showed an intradural mass (2.5 cm in diameter) at the L4 level. The patient had been severely disabled for 22 years after a previous intraventricular brain tumor resection. At that time, the diagnosis was angioblastic meningioma, which was thought to be incorrect. At 14 years after the brain surgery, gamma knife radiosurgery was performed three times for newly developed or recurred supratentorial and infratentorial tumors in the cerebrospinal fluid pathway. The patient underwent lumbar spinal surgery, and a gross total removal of the mass was performed, which confirmed the histopathological diagnosis of HB. We reexamined the old histopathological specimen of the intraventricular tumor from 20 years ago and changed the diagnosis from angioblastic meningioma to supratentorial HB. Six months after spinal surgery, the patient underwent a second spinal surgery and brain surgery, and the histopathological diagnosis was HB following both surgeries, which was the same following the first spinal surgery. Here, we report a sporadic supratentorial HB patient who showed cranial and spinal disseminations for more than two decades along with a literature review.
지방유래 줄기세포가 이식된 Vicryl Mesh의 섬유화와 육아조직 형성에 미치는 영향
허찬영 ( Chan Yeong Heo ),하현정 ( Hyun Jung Ha ),김지회 ( Ji Hoe Kim ),정의철 ( Eui Cheol Jeong ),은석찬 ( Seok Chan Eun ),백롱민 ( Rong Min Baek ),김석화 ( Suk Wha Kim ),민경원 ( Kyung Won Minn ) 한국조직공학·재생의학회 2010 조직공학과 재생의학 Vol.7 No.1
Vicryl mesh consists of polyglactin 910, a synthetic absorbable copolymer made from 90% glycolide and 10% L-lactide. The empirical formula is (C2H2O2)m(C3H4O2)n. The mesh is knitted from uncoated and undyed fiber identical in composition to that used in Vicryl sutures, which has been found to be inert, nonantigenic, nonpyrogenic and to elicit only a mild tissue reaction during absorption. It may be used wherever temporary wound or organ support is required, particularly in instances in which compliant and stretchable support is desired. Successful use is reported for instance as support for the correction of breast deformity. Because a putative potential stem cell population within the adipose tissue has been found to possess therapeutic potentials, we authors sought to determine the effect of adipose tissue-derived stem cells(ADSCs) on Vicryl mesh implantation. Sprague-Dawley rats were divided into two groups one is control, given the surgery of simple Vicryl mesh implantation and the other is stem cell group, given the surgery of mesh implantation and ADSCs(N=12 for each group). Before the surgery ADSCs of stem cell group were isolated from the inguinal fat pads and expanded ex vivo for three passages. Control group received multi-folded Vicryl mesh implantation to the back of the rats and Stem cell group received the surgery of Vicryl mesh implantation and ADSCs. After four weeks of operation, matrix formation, capillary density and collagen production were assessed quantatively under the light microscope. ADSCs led to a statistically significant increase in fibrosis and mature scar formation compared with the control group in histologic examination (p < 0.05). ADSCs was found to be efficacious in promoting fibrosis and scar maturation leading volume replacement on experimental Vicryl mesh implantation. This study might be used as useful volume replacement with Vicryl mesh for correcting breast deformity after conservative surgery.