예비수학교사의 신념에 따른 교수학적 내용지식(PCK)과의 관련성에 관한 연구

고상숙,김은호,문정윤,배지은,정대진 이화여자대학교 교과교육연구소 2011 교과교육학연구 Vol.15 No.4

This study investigated the relationship between PCK (Pedagogical Content Knowledge) and pre-service mathematics teachers' mathematical beliefs, and the effects of PCK on their teaching. The data were collected through pre & post interviews, a questionnaire, and classroom observations of six pre-service mathematics teachers who were taking their field practica in their senior year. The results indicate that the pre-service mathematics teachers' differing beliefs about the nature of mathematics affected their PCK. This study showed the relationship between their beliefs about teaching and the learning of mathematics and PCK. It is recommended that more opportunities for PCK development, as well as for modifications in of their beliefs have to be offered in education programs for pre-service mathematics teachers. 본 연구의 목적은 예비수학교사들의 수학적 신념과 수업에서 발현된 교수학적 내용지식(PCK)의 특징을 알아보고, 이를 통해 수학적 신념에 따른 PCK의 관련성에 대해 분석하는 것이다. 이 연구는 교육실습 중인 예비수학교사 6명을 대상으로 실시한 PCK 설문지, 인터뷰 자료, 수업관찰 자료를 분석하는 질적 연구 방법을 토대로 하였다. 연구결과, 예비수학교사들의 다양한 수학 본질에 대한 신념은 PCK에 서로 다른 영향을 주었으며, 수학 교수-학습에 대한 신념과 PCK사이에는 밀접한 관련성이 있음을 볼 수 있었다. 따라서 신념과 교수학적 내용지식(PCK)을 함께 발달시킬 수 있는 예비교사 연수 및 지원 프로그램의 확충이 필요하다.

교정용 와이어 및 브라켓에 이산화티탄 광촉매 코팅 시 코팅방법에 따른 비교연구

고은희,조진형 대한치과교정학회 2006 대한치과교정학회지 Vol.36 No.6

본 연구는 항균 교정장치의 개발에 도움이 되고자 이산화티탄 광촉매의 코팅 시 안정적이고 효과적인 방법을 찾기 위하여 시행되었다. 시판되고 있는 교정용 와이어와 브라켓에 sol-gel법, CVD (Chemical Vapor Deposition)법 및 PE-CVD (Plasma Enhanced-CVD)법으로 이산화티탄을 각각 코팅한 다음 각 방법으로 코팅된 이산화티탄 박막의 특성을 알아보고자 주사전자현미경을 이용하여 각 시편의 코팅박막 표면의 거칠기를 관찰하였고 adhesive tape pull test를 이용하여 코팅박막의 접착강도를 측정하였다. 메틸렌블루용액에 각 시편을 침지시킨 후 시간경과에 따른 메틸렌블루용액의 농도변화 측정을 통해 코팅박막의 분해능을 평가하였으며 불화나트륨 용액에 각 시편을 침지시킨 후 주사전자현미경을 이용하여 표면부식 정도를 관찰함으로써 불소화합물에 대한 내부식성을 평가하여 다음과 같은 결과를 얻었다. 코팅박막의 표면은 CVD법 및 PE-CVD법이 sol-gel법이나 코팅되지 않은 시편에 비해 더 매끄러웠다. 코팅박막의 접착강도는 PE-CVD법이 가장 높았고, CVD법, sol-gel법의 순으로 낮게 나타났다. 코팅박막의 메틸렌블루 분해능은 PE-CVD법이 가장 높았고, CVD법, sol-gel법의 순으로 낮게 나타났다. 코팅박막의 불소화합물에 대한 내부식성은 CVD법 및 PE-CVD법이 sol-gel법에 비해 높게 나타났다. 이상의 결과는 교정용 와이어 및 브라켓의 이산화티탄 광촉매 코팅 시 CVD법 및 PE-CVD법이 sol-gel법보다 적절한 방법임을 시사하였다. The purpose of this study was to search for an appropriate method of coating TiO_(2) on orthodontic appliances. TiO_(2) thin films were deposited on orthodontic wires and brackets using sol-gel, CVD(Chemical Vapor Deposition) and PE-CVD (Plasma Enhanced-CVD) methods. The roughness of TiO_(2)-coated surfaces was investigated via scanning electron microscope (SEM) and adhesive strength of TiO_(2) thin films was measured by adhesive tape pull test. Methylene blue degradation test was carried out to evaluate the photocatalytic activity of TiO_(2) and the corrosion resistance of TiO_(2) thin films against fluoride solution was also analyzed by observing the surfaces of TiO_(2)-coated wires and brackets via SEM after immersion in sodium fluoride solution. Through the comparison of properties and photocatalytic activity of TiO_(2) thin films according to the coating methods, the following results were obtained. Smoother surfaces of TiO_(2) thin films were generated by CVD or PE-CVD methods than through the sol-gel method or the control. Adhesive strength of the TiO_(2) thin films was highest in PE-CVD and gradually became lower in the order of CVD, then the sol-gel method. Photocatalytic activity of TiO_(2) thin films on methylene blue was the highest in PE-CVD and gradually became lower in the order of CVD, then the sol-gel method. Corrosion resistance of TiO_(2) thin films against fluoride solution was stronger in CVD and PE-CVD methods than in the sol-gel method. The results of this study suggest that the CVD or PE-CVD methods is more appropriate than the sol-gel method for TiO_(2)coating on orthodontic wires and brackets.

육안적 혈뇨로 내원한 환자에서 발견된 방광 유전분증 : 증례보고

김은진;성 현;홍수민;정성연;박경식;손형래;박일권;구호석;고행일 인제대학교 백병원 2011 仁濟醫學 Vol.32 No.-

Amyloidosis is a disease resulting in deposition of amyloid in the body. The disease can be either primary or secondary. The amyloidosis of urinary bladder is more usually affected by primary amyloidosis and also very rare. The patient with primary amyloidosis of the bladder usually presents with gross hematuria. The amyloidosis resembles bladder cancer in cystoscopy. It can be confirmed by biopsy. The treatment consists of medication (e.g., steroid, antitumor agent, cholchicine, DMSO) and/or transurethral resection. The standard treatment is mephalan and prednisolone. A 49-year-old man complained of recently developed gross hematuria without abdominal pain. We examined urinary bladder cystoscope for gross hematuria. It revealed small bulging mass on trigone are a of bladder. Therefore we did bladder biopsy. Finally, it revealed bladder amyloidosis. The patient was improved by medication (mephalan 2mg and prednisolone 1 mg/kg po daily). We report an unusual case of amyloidosis involving bladder.

정상 성인에서 운동이 혈중 Cortisol과 포도당 및 전해질 농도에 미치는 효과

정진상,정순열,안태순,고성은 최신의학사 1993 最新醫學 Vol.36 No.7

Pb-62% Sn 공정합금의 초소성에 관한 연구

배은현,고광진,장현구 成均館大學校 科學技術硏究所 1989 論文集 Vol.40 No.2

The effects of reduction ratio and purity on the superplasticity of Pb-62%Sn eutectic alloys were studied. The alloys of two values of reduction ratio(r=10 : 1, 25 : 1) and impurity content(alloy A : 0.075%, alloy B : 0.216%) were prepared to compare the flow stress and elongation at constant strain rate. Also, the effect of temperature on the tensile behavior and the structural changes of the surfaces were investigated. Larger elongations were achieved for more worked(r=25 : 1) alloys because of their finer equiaxed grains, and for more purified alloy A in which less impurities inhibit the grain boundary sliding. Maximum elongation of 2300% was obtained for alloy A at room temperature, r = 25 : 1 and strain rate, ε˙= 1.4 x 10 exp(-4)/s. Increase in temperature, caused increase in strain rate sensitivity and decrease in flow stress, which explains that atomic accommodation process and grain boundary migration arc more enhanced at elevated temperature.

왕우렁이(apple snails)의 생리ㆍ생태적 특성에 관한 연구

이상범,고문환,나영은,김진호 한국환경농학회 2002 한국환경농학회지 Vol.21 No.1

왕우렁이가 자연상태에 전파되어 서식되는 경로는 양식장의 배수시, 홍수로 인한 노지 양식장 붕괴 및 제초용 왕우렁이 입식에 의하여 이루어지고 있다. 왕우렁이의 생리적 특성을 보면 알 크기는 2.47 ㎜, 난괴크기는 1.8×4.3×0.94 ㎝, 알무게 12.78 ㎎, 산란수 157∼784개/1마리(평균 321개/마리) 유체크기 1.69×2.15㎜, 유체 무게 3.32㎎ 최저 산란 왕우렁이 크기 2.40×2.26 ㎝ 이상, 1개알 산란소요시간 22.4초 였다. 알의 색변화는 산란직후 우유빛의 연분홍에서 중기에는 선홍색, 부화직전에는 흐린 연보라색으로 변화하면서 부화된다. 왕우렁이 섭식 대상은 벼, 논잡초, 미나리, 토마토, (양)배추, 무, 호박, 콩잎 등 대부분의 농작물을 포함한 식물체 및 동족의 왕우렁이 등 수중동물이었다. 왕우렁이 월동지역은 장항, 장성 및 해남지역으로 양지녘의 식물체 줄기나 벼 그루터기에 산란된 알과 성체 상태로 저수지나 논의 물웅덩이에서 월동고, 5월 중순이후 수로의 벽이나 식물체 줄기에 산란하며 6월과 9월에 번식이 가장 왕성하였다. 서식지 수질특성은 변이 폭이 컸으나 pH가 7.07∼9.50 범위로 알칼리성에서 주로 번성하였다. 왕우렁이에 의한 벼 가해 양상중 바 발아초기에는 왕우렁이 크기에 관계없이 모두 벼싹을 가해하였고, 벼품종과 생육시기에 따라 차이가 있으며 어린묘 일수록 가해율이 높았으며, 이앙후 45일 벼(초장 약 73 ㎝)도 각고 3.3∼3.5 ㎝ 이상의 중형 왕우렁이는 가해하였다. This experiment was carried out to obtain some information about overwintering, physiological and ecological characteristics of apple snails. Another purpose of this experiment was to characterize an appetite for rice plants by apple snails and to elucidate their choice of fresh green ones (vegetables, some other crops, weeds in rice fields). The freshwater snails were found with higher population at sites abundant organic compounds such as plant debris and at regions with high temperature. They also prefer calcium-rich water. This is a naturally occurring process. Apple snails were exceptionally well-adapted to the south regions of Korea, especially Janghang, Jangseong and Haenam, even if the temperature of winter season is cold below 0℃. Apple snails were not very selective in their food choice and eat almost everything available in their environment. A snail have something called a radula in its mouth for grinding up its food. A apple snail also chews on fruits and young succulent plant barks. In case of reproduction, apple snails deposit about 157~784 (average of 321 eggs) milky white to pale orange colored eggs above the waterline. In approximately every 22.4 seconds a new egg appears. The total time needed to deposit a egg mass varies from 58 minutes~4 hours 13 minutes. Apple snails reproduct actively from May to June and from September to October. An appetite of apple snails for rice plants was the different depending on their size and growing stage for rice plants. Apple snails had a great appetite of rice plants as well as dropwort, tomato, cabbage, radish, aquatic plants etc. They preferred to eat young rice plants and drastically quit eating rice plants of over 40 cm in height. Thus considering the food preference of apple snail for various plants including rice, they were thought to be a potentially strong predator in fields, especially, at regions with warmer winter.

폐경기 증후군 환자에서 Cyclofenil의 치료 효과

김덕윤,고은미,우정택,양인명,김진우,김영설,김광원,최영길 최신의학사 1992 最新醫學 Vol.35 No.10

유방암과 섬유선종의 방사선학적 소견 : 유방 단순촬영술과 유방 초음파검사 소견의 비교 연구 Studies on mammographic and ultrasonographic findings evaluation

임한혁,최득린,고은석,이혜경,임철완,이상진,홍현숙,최교창,김영화,박재성 순천향의학연구소 1997 Journal of Soonchunhyang Medical Science Vol.3 No.2

Purpose : To evaluate the utility of mammography and ultrasonography in study of morphologic differential diagnosis between malignant and benign mass. Materials and Methods : Average age of patients with breast cancer was 48.4 year-old, and that of fibroadenoma was 29.4 year-old. The equipments used for examination were MF-159 high frequency mammography(Bennet Co.) and Acoustic image 5200S. We evaluated mammographic findings about breast parenchymal pattern, calcification, margin and size of the mass associated tumor nature, and ultrasonographic findings about shape, height and width, internal homogenicity and echo pattern, wall contour, boundary echo, and posterior shadow in breast mass. Thirty-seven of mammographic findings and 34 cases of ultrasonogreaphic findings in pathologically proven breast cancer and 34 case of mammographic findings and 71 cases of ultrasonographic findings in breast fibroadenoma were reviewed retrospectively. Results : In mammographic study, the parenchymal patterns of breast cancer according to Wolfe classification were NI(16.2%), PI(24.3%), P@(37.8%), and DY(21.6%) and those in fibroadenoma were NI(3.1%), Pl(11.7%), P2(35.2%),and DY(50%). Mammographic findings about presence of calcification were as follows; only calcification(16.2%), only mass(51.3%), and mass with calcification(32.5%) in breast cancer, and only mass(91.2%), mass with calcification(8.8%) in fibroadenoma. The features of mass margins were classified as ill-defined margin(45.9%), well-defined(5.4%), and well-defined with partial spiculation(48.6%) in breast cancer and ill-defined(20.5%), well-defined(73.5%), and well-defined with partial spiculation(5.8%) in fibroadenoma. The mass were grouped by size; 1-2cm(37.8%), 2-4cm(45.9%), and 4-6cm(16.3%) in breast cancer and 1-2cm(79.4%), 2-4cm(17.6%), and 4-6cm (3.0%) in fibroadenoma. On ultrasonographic study, the shape of masses in breast cancer were lobulated(82.3%),oval(14.7%), and round(3.0%),and those in fibroadenoma were lobulated(14.0%), oval(57.7%), and round(18.3%). The cases that the height was longer than width were 32.3% in breast cancer and 0% in fibroadenoma. The findings about homogenecity and echo patterns were as follows; hypoechoic(52.9%) and mixed(47.1%) in breast cancer and hypoechoic(2.8%), hypoechoic(63.4%), and mixed(33.8%) in fibroadenoma. The margin of masses were smooth in 85.9% of fibroadenoma, and irregular in 73.6% of breast cancer. The boundary echoes of masses and decreased posterior echo shadow were seen only in 61.8% and 55.9% of breast cancer, respectively. Conclusion: The margin and calcifications are more clearly delineated on mammography but breast cancer and fibroadenoma, both are more commonly developed in dense parenchymal pattern(P2+DY),and there findings are easily obscured in mammography. So ultrasoography is very useful in these masses evaluation, especially amoung young patients.

전신성 괴사성 혈관염으로 인한 신경병증의 전기진단적 특성

김현숙,고은미,김진석 大韓再活醫學會 1998 Annals of Rehabilitation Medicine Vol.22 No.5

다발성 대장암 간전이 환자의 간절제를 위한 새로운 시도

주종우,김형철,임철완,신응진,조규석,유기원,송옥평,홍대식,박성진,조준희,이혜경,김희경,권계원,고은석 순천향의학연구소;Soonchunhyang Medical Research Institute 2004 Journal of Soonchunhyang Medical Science Vol.10 No.2

Multiple bilobar liver matastases (MBLM) are the main cause of low resectability in the colon cancer liver metastases. The authors experienced one case of initially non-resectable colon cancer liver metastases. He was curatively and safely treated with a two-stage hepatectomy using the new method of future remnant liver volume growing. A 54-year-old man was referred to our department with the sigmoid colon cancer combined with MBLM, which were checked in two small metastatic lesions in the left lobe and five large sized lesions in the right lobe in the computed tomogram (CT). A laparoscopic assisted anterior resection was primarily performed. We performed the 1^(st) stage hepatectomy 3 weeks after the colon resection. Intra-operative Ultrasonogram (US) found 9 small superficial metastatic lesions in the left lobe. All that lesions were completely removed by non-anatomical wedge resection. An occlusion ballon catheter was placed in the right portal vein through a small branch of the inferior mesenteric vein at that time. The future remnant liver volume was sufficiently increased 3 weeks after the 1^(st) hepatectomy. A right hepatectomy was safely performed 22 days after the 1^(st) hepatectomy. The patient received a regional chemotherapy (interleukin2 based immuno-chemotherapy through hepatic artery) for 4 months, then received 9 cycles of systemic chemotherapy (biweekly Oxaliplation, leucovorin, plus 5-fluorouracil) without any recurrence evidence.