플립드러닝 기반 문제중심학습이 수학과 학업 성취도와 태도에 미치는 효과

장유현 ( Jang Yoo Hyun ) 대경교육학회 2022 교육학논총 Vol.43 No.2

본 연구는 플립드러닝 기반 문제중심학습을 적용한 수업이 학습자들의 수학과 학업성취도 및 수학적 태도에 미치는 영향을 살펴보고 이러한 수업에 대한 학습자들의 만족도 및 인식을 살펴보는 데 주요 목적이 있다. 이를 위하여 D시에 소재한 P초등학교 5학년의 2개 학급을 실험집단과 비교집단으로 선정하였다. 실험집단은 플립드러닝 기반 문제중심학습을 6주간 총 24차시에 걸쳐 적용하였으며 통제집단에는 실험집단과 동일한 단원, 차시를 교사의 설명식 수업방법으로 진행하였다. 플립드러닝 기반 문제중심학습의 효과성을 확인하기 위해 수업실시 전후로 수학과 학업성취도와 수학적 태도 사전-사후검사를 실시한 후 순위 공변량 분석(ranked ANCOVA)과 공변량 분석 (ANCOVA)을 통해 분석하였다. 본 연구를 통해 밝혀진 결과 첫째, 실험집단과 비교집단 간 학업성취도에 있어 통계적으로 유의미한 차이가 있는 것으로 나타났다. 둘째, 수학적 태도 하위 요인 중 수학 흥미 요인, 학습태도 요인, 가치 요인, 학습 의지 요인, 내적 동기 요인, 효능감에서 두 집단간 유의미한 차이가 있는 것을 확인하였다. 본 연구의 결과를 종합해 볼 때, 플립드러닝 기반 문제중심학습은 초등학생들의 학업성취도와 수학적 태도를 향상시키는데 긍정적으로 기여할 것으로 기대된다. The main purpose of this study is to examine the effects on learners’ learning achievement and attitude in mathematics. The research also examined students’ satisfaction and perception toward flipped learning based PBL. The subjects of this study were two 5th grade classes from an elementary school in Daegu Metropolitan City. The classes were assigned into a treatment group and a control group. A treatment group which applied flipped learning based PBL had 17 students. A control group which applied the traditional teaching method was comprised of 15 students. Flipped learning based PBL was implemented for 6 weeks in treatment group. A ranked analysis of covariance(ranked ANCOVA) and analysis of covariance(ANCOVA) were conducted to examine the effects of the students’ achievement and attitude in mathematics between the two groups. The results were as the follow. First flipped learning based PBL had positive effect on the improvement of learning achievement in mathematics compared to the traditional teaching method. Second, flipped learning based PBL had a positive effect on improving students’ attitude towards mathematics compared to the traditional teaching method. Among sub-categories of mathematical attitudes, all factors except for recognition-desire showed significant differences between treatment and control group. In addition, treatment group showed higher scores for all attitude variables than control group. Third, it was found that learners who participated in the flipped learning based PBL showed high satisfaction with the course. The results of this study show that flipped learning based PBL significantly improve students’ learning achievement and attitude in mathematics. Further research is required to develop more concrete strategies and guidelines to support teachers to apply flipped learning based PBL in their classrooms.

흡수장애 증후군으로 나타난 악성림프종과 동반된 유전분증

김태헌(Tae Hun Kim),김재규(Jae Gyu Kim),장유현(Yoo Hyun Jang),송상용(Sang Yong Song),정현채(Hyun Chae Jung),송인성(In Sung Song),조한익(Han Ik Jo),김용일(Yong Il Kim),최규완(Kyoo Wan Choi),김정룡(Chung Yong Kim) 대한소화기학회 1995 대한소화기학회지 Vol.27 No.4

Amyloidosis is known as a disease that affects almost all organs, and may especially cause wides- pread damage to the gastrointestinal tract. Intestinal amyloid may cause motility disturbances with diarrhea or constipation, malabsorption, bleeding, and perforation. We report a case of systemic amyloidosis presenting as a malabsorption syndrome. A59-year old woman with abdominal pain and chronic diarrhea turned out to have malignant lymphoma, GI amyloidosis, monoclonal gammopathy, and malabsorption syndrome. Well differentiated lymphocytic lymphoma was diagnosed by bone marrow biopsy. Endoscopic biopsy tissues from duodenum and rectum showed typical electron microscopic and staining features of amyloidosis. Serum protein electrophoresis revealed IgG k monoclonal gammopathy. D-xylose test and a- anti-trypsin clearance test confirmed malabsorption and protein-losing enteropathy, respectively. (Korean J Gastroenterol 1995;27: 481-487)

회장의 염증성 섬유양 용종에 의한 성인 장중첩증 1 예

이창수(Chang Soo Lee),남수연(Su Youn Nam),박란연(Ran Young Park),이지현(Jee Hyun Lee),정의준(Euh Jun Jeung),장유현(Yoo Hyun Jang),이계희(Kye Heui Lee),노은진(Eun Jin Rho),김나래(Na Rae Kim),양대현(Dae Hyun Yang) 대한소화기학회 2002 대한소화기학회지 Vol.40 No.1

N/A

장림프관확장증

송인성(In Sung Song),최규완(Kyoo Wan Choi),김정룡(Chung Yong Kim),고광철(Kwang Cheol Koh),김용태(Yong Tae Kim),류지곤(Ji Kon Ryu),전재석(Jae Seok jeon),장유현(Yoo Hyun Jang),김태유(Tae Yoo Kim) 대한소화기학회 1993 대한소화기학회지 Vol.25 No.6

Intestinal lymphangiectasia is a disorder of small intestine, which is associated with dilation of intestinal lymphatics and leakage from ruptured lacteals to intestinal lumen of intestinal lymoh which contains plasma proteins, chylomicrons, and small lymphocytes. Congenital or primary intestinal lymphangiectasia is due to a malformation of lymphatic systems, whereas secondary intestinal lymphangiectasia is preceded by inflammatory or neoplastic disease and is also caused oy decrease in lymph flow from thoracic duct due to elevated pressure in the left subclavian vein, Recently we experienced a 23 year-old female patient with recurrent tetanic attacks and the features of protein-losing enteropathy confirmed by a1-antitrypsin clearance test. And with the aid of blind peroral jejunal biopsy we diagnosed her as having intestinal lymphangiectasia, showing dilated lymphatics in the lamina propria. So, we report the first adult case of intestinal lymphangiectasia confirmed by histologic findings in Korea, without apparent secondary cause.

복강내 종괴로 나타난 닭뼈에 의한 장천공 1 예

박정진(Jeong Jin Park),임선희(Seon Hee Lim),김봉룡(Bong Ryong Kim),김형완(Hyoung Wan Kim),김준완(Joon Wan Kim),김태형(Tae Hyong Kim),장유현(Yoo hyun Jang),이계희(Kyu Heui Lee),양대현(Dae Hyun Yang) 대한소화기학회 2001 대한소화기학회지 Vol.38 No.1

Idiopathic portal hypertension (IPH) is a rare disease characterized by overt splenomegaly and portal hypertension in the absence of cirrhosis or vascular obstruction. The most common cause of death in IPH patients is known to be variceal bleeding, which is usually treated with surgical method. Recently, interventional radiologic methods such as transjugular intrahepatic portocaval shunt, ballon-occluded retrograde transvenous obliteration, or partial splenic embolization (PSE), have been tried to control portal hypertension. A 24-year-old man presented with repeated gastrointestinal bleeding due to rupture of esophageal varices, but his liver function tests were completely normal and any possible etiologies of his portal hypertension couldn’t be demonstrated. He was diagnosed as IPH by laparoscopic liver biopsy after PSE, which could control portal hypertension as well. For twelve months after PSE, he hasn’t experienced bleeding again. We report the case of PSE to control portal hypertension in a patient with IPH who presented with variceal bleeding. (Korean J Gastroenterol 2001;38:48-52)

십이지장암으로 오인된 비후형 십이지장 결핵 1 예

김태형,임선희,장유현,김형완,김준완,김봉룡,박정진,이계희,최신은 대한소화기내시경학회 2001 Clinical Endoscopy Vol.23 No.1

The prevalence of intestinal tuberculosis has been markedly decreased with the development of antituberculoug chemotherapy, improved economic conditions, preventive medicine and early detection and treatment of pulmonary tuberculosis. An even more impressive resurgence of pulmonary and extrapulmonary tuber culosis has been seen in recent years among persons infected with the human immunodeficiency virus. The most common signs of infeshna1 tuberculosis is the ileocecal region, and duodenum is a rare site. Symptoms and signs of duodenal tuberculosis are nonspecific. The gross pathologic appearance of the duodeznal tuberculous lesions has to its traditional categoriration into three farms. 1) ulcerative, 2) hypertrophic, and 3) ulcerohypertrophic (mixed). Hypertrophic lesions of the duodenal tuberculosis should be differentiated from duodenal adenocarcinoma and lymphoma. We herein report a case of duodenal tuberculosis presenting as intraluminal protruding mass in gastroduodenoscopy and multiple intraabdomina1 lymphadenopathy on abdominal CT. We have confirmed the duodena1 tuberculosis by endoscopic biopsy, and review the current literatures.

우리나라 간암 환자에서의 Cytochrome p450 2E1유전자의 다형성에 관한 연구

백승운,이효석,김정룡,윤정환,장유현,황유진 대한소화기학회 1998 대한소화기학회지 Vol.30 No.4

Background/Airns: Cytochrome P450 2E1(CYP2EI) is the only enzyme that rnetabolizes very low doses of N-nitrosodimethylamine(NDMA) and is characterized by its ethanol inducibility. Recently, it has been shown in an animal-experimental study that NDMAinduced hepatocarcinogenes was facilitated by chronic alcohol ingestion. CYP2E1 expression in human beings was reported to be about 10 times higher in genotype c2/c2 than in genotype c1/c1. Bacause CYP2El gene expression is the highest in the liver, we hypothesized that the polymorphism of CYP2E1 may affect the risk of hepatocellular carcinoma(HCC), especially in patients with chronic alcohol consumption. Methods: We enrolled 46 HCC patients and 32 age-sex-matcied healthy controls without liver disease or cancer in any other organ. The genotypes in the 5-flanking region of CYP2E1 gene were determined by restriction fragment length polymorphisms using two endonucleases: PstI and RsaI. Results: The frequencies of genotype A(c1/c1), B(c1/c2) and C(c2/c2) were 56.5%, 39.1%, 4.4% in HCC patients, and 62.5%, 28.1%, 4.4% in controls, regiectively. The frequency of allele c2 was 23.9% in HCC patients and 23.4% in control, re.;pectively. The difference in the frequencies of both CYP2E1 genotyps and alleles was not statistically significant between the HCC patients and controls. The HCC patients with a history of ckonic alcohol ingestion were more like]y to carry genotype B and C than in patients without such history, even though the differences are not statistically significant(p=0.077). Conclusions: Although polymorphisms of CYP2E1 gene is not a major genetic risk factor for the development of HCC, it might increase the risk of HCC in patients with chronic HBV or HCV infection and chronic alcohol consumption. Further study to test this bypothesis on a large number of patients and on patients of different ethnic groups is warranted.

직장 출혈을 보인 생선뼈 이물의 내시경적 제거 1 예

임병철,김태형,임선희,장유현,김형완,김준완,김봉룡,박정진,이계희 대한소화기내시경학회 2001 Clinical Endoscopy Vol.23 No.1

Impaction of an ingesfed foreigm body in the colon is uncommon but surgical or endoscopic intervention is occasionally needed when serious complicafions such as perforation, obstruction or hemorrhage occur. Several factors may predispose a patient to ingestion and subsequent impaction of lower intestinal foreign body. It is more common in the elderly who wear dentures, in the mentally infirm, in chronic alcoholics or rapid eating. The majority of impaction occurs at narrowing and angulation such as ileocecal valve or rectosigmoid junction. The diagnosis of lower intestinal foreign body should be considered, among more common conditions, in the differential diagnosis of elderly patients who present with altered bowel habits. We report the case with a literature review that successfully endoscopically removed the fish bones impacted in the rectosigmoid colon complicated by rectal bleeding.

전신 부종으로 발현한 단백 상실성 위암 1 예

김태헌,송인성,정현채,최규완,김정룡,한철주,이동수,장유현,신건성,조창락 대한내과학회 1996 대한내과학회지 Vol.50 No.1

Hypoalbuminemia due to gastrointestinal loss of protein has been reported in association with many pathologic conditions of stomach and bowel. We have recently experienced a 63 year old man with stomach cancer presenting with generalized edema. The patient .had severe hypoalbuminemia and we confirmed protein loss through the gastric mucosa as its cause by ^(99m)Tc labled albumin scan and alpha 1 antitrypsin clearance test. The possiblility of other coincidental gastrointestinal lesion was excluded. After total gastrectomy, hypoalbuminemia was corrected to normal range without replacement of albumin and follow up albumin scan revealed no albumin loss. To our knowledge there have been a few case reports of protein losing gastroenteropathy due to stomach cancer. Therefore, it is recommended to exclude cancer at first, when an etiologic diagnosis is scheduled for the differentiation of protein losing enteropathy in this country.

췌장암 및 만성 췌장염 환자에서 경피적 세침 흡인으로 얻은 검체의 K-ras 유전자 변이 검출과 이의 유용성

이우진,김용태,김정룡,한준구,윤용범,류지곤,장유현 대한소화기학회 2000 대한소화기학회지 Vol.35 No.1

Background/Aims: K-ras gene mutation is present in 80-90% of human pancreatic cancer and thus, could be used as a new diagnostic tool. The purpose of this study was to assess the utility of K-ras mutation analysis in the differential diagnosis of pancreatic diseases using the percutaneous needle aspirates of pancreatic masses. Methods: Aspirates of 16 patients with pancreatic cancer, 4 patients with chronic pancreatitis and 4 patients with pancreatic cysts were collected prospectively. Cytological analysis was performed and DNA was extracted simultaneously from the samples. K-ras mutations were detected by the enriched polymerase chain reaction-restriction fragment length polymorphism method and the DNA sequence was analyzed. Results: K-ras mutations were detected in 9 (56%) of 16 cases of pancreatic cancer. Cytological analysis for the patients with pancreatic cancer revealed malignant tumors in nine patients, atypia in two, and benign tumors in five. In combination with cytological analysis, detection of K-ras mutations offered a diagnostic sensitivty of 81%. The most frequently observed mutation was G-A transitions (GGT-GAT) at codon 12, resulting in alteration of Glycine to Aspartic acid. However, 1 of 4 patients with chronic pancreatitis and 2 of 4 patients with pancreatic cysts also showed K-ras mutation. Conclusions: Although the detection of K-ras mutation from the percutaneous needle aspirates can enhance the sensitivity for the diagnosis of pancreatic cancer, its clinical use is limited because of the nonspecificity.