초등 과학 생명 영역 내용에 대한 학생들의 의문 유형과 해결방법에 관한 연구

임채성,최은아,박정인,이수진 부산교육대학교 과학교육연구소 2004 科學敎育硏究 Vol.29 No.-

In this study, the frequencies and types of questions about LIFE areas of the Science Curriculum of elementary school students were investigated through in-depth interviews with twelve 4th and 5th graders. The results of the research can be summarized as follows: (1) In conjectural question, the proportions of 'object exploration question' and 'object verification question' were high in all of the 4th graders and the students of low achievement level. (2) The numbers of causal questions generated by the 4th graders were much higher than those of the 5th graders. (3) The frequencies of the predictive, methodological, applicative questions were very low both in 4th and 5th grade students. (4) The numbers of conjectural questions were more in all students except the low achievement level of 4th graders at not-yet-taken contents than at already-taken ones. (5) The numbers of causal questions were more in all students except the low and middle achievement levels of 4th graders at not-yet-taken contents than at already-taken ones. (6) The numbers of the predictive, methodological, applicative questions of the 4th graders were more at not-yet-taken contents than at already-taken ones, whereas opposite trend in the 5th graders. (7) The numbers of students' curriculum-related questions were more in all students except the low and middle achievement levels of 4th graders at not-yet-taken contents than at already-taken ones. (8) As ways for solving or seeking answers about questions, the 4th graders suggested methods of consulting experts or teachers (23.9%), internet searching (21.6%), and books or science-related encyclopedia (20.3%), while the 5th graders suggested the internet searching (36.5%), consulting experts or teachers (24.8%), and books or science-related encyclopedia (17.7%). Based an these results, we suggest several ways for improving the question-posing abilities of the students and adequate use of students' questions in the process of science teaching learning.

국내외 ‘영아’ 관련 연구물의 최근 동향 분석 : 2000년~2013년 발간 논문을 대상으로

이승연,권수현,권연정,김언경,나영이,유주연,최정아 이화여자대학교 교육과학연구소 2015 교육과학연구 Vol.46 No.3

The purpose of this study was to examine research trends in infant research published from 2000 to 2013, in order to understand overall aspects in research topics, methods, and subjects in infant research and to suggest directions for future infant research. A total of 2916 journal articles and theses/dissertations, both domestic and foreign, were selected for the analysis. The findings of this study were as follows: First, for the 14 year period, 737 domestic articles, 634 domestic theses/ dissertations, 1242 foreign articles, and 303 foreign dissertations on infant research were published, and there was a steady increase in the number of articles and theses/dissertations over the years. Second, in terms of research topics, different patterns were found between the domestic ones and the foreign ones; the topic of “education and teachers” in the domestic ones and “development” in the foreign ones occurred most frequently. Third, in terms of research methods, the domestic ones employed “survey” the most, and the foreign ones employed “experiment” the most among quantitative research methods; when analyzing the relation between methods and topics, the foreign ones showed clear matches between topics and research methods, while the domestic ones preferred “survey” regardless of the topics. Fourth, in terms of subjects/participants, “infants” were the most researched in both the domestic ones and the foreign ones, followed by “parent” and “teachers.” Among the infants, the domestic ones focused on 25~36-month olds the most, while the foreign ones focused most on 0~12-month olds. In addition, in all types of infant research, there were more single subject studies than multiple subject ones.

Development of Double Swirl Combustor for Thermal Treatment with Waste Refrigerants (HFCs)

( Su-ah Choi ),( Jong-seung Chae ),( Ho-hyun Shin ),( Tae-in Ohm ) 한국폐기물자원순환학회(구 한국폐기물학회) 2015 한국폐기물자원순환학회 3RINCs초록집 Vol.2015 No.-

Recently, as an eco-friendly method of treating waste refrigerants having the high GWP, an HF gas neutralizing method in which the waste refrigerant is completely destroyed at high temperature and then discharged in the form of a gas phase is widely used. However, this method has large auxiliary energy consumption, and thus the development of a new combustor is required. This study is to develop a double swirl combustor, thereby reducing the auxiliary energy consumption. The combustor is manufactured in a double pipe type, and air is swirlingly supplied in an air preheating chamber in which the air is preheated and a combustion chamber, respectively. In the case of the double swirl-type air supplying manner, since the air can be preheated at high temperature due to radiation heat transfer from flame in the combustion chamber, the auxiliary fuel can be minimally consumed, while the waste refrigerant is destroyed at the high temperature.

Engineering of the Biotransformation Process to Overproduce Lysolecithin from Lecithin

Su-Ah CHOI,Yeji HWANG,Ara CHO,Jin-Byung PARK 한국생물공학회 2019 한국생물공학회 학술대회 Vol.2019 No.10

Decompressive C1 Laminectomy without Fusion for the Treatment of Craniovertebral Junction Stenosis with Myelopathy: Could It be One of Option?

Choi Seon-Ah,Kim Kyung Hyun,Choi Un Yong,Park Jeong Yoon,Kuh Sung-Uk,Chin Dong Kyu,Kim Keun Su,Cho Yong Eun 대한말초신경학회 2019 The Nerve Vol.5 No.2

Objective Trans-oral approach or occipitocervical/atlantoaxial fusion with/without posterior decompression has been considered to be an appropriate surgical strategy for craniovertebral junction (CVJ) stenosis with myelopathy. However, decompressive C1 laminectomy without posterior stabilization was reported recently for treating retro-odontoid pseudotumor. This study aimed to evaluate surgical outcomes of the patients treated with decompressive C1 laminectomy without posterior stabilization for CVJ stenosis with myelopathy. Methods Ten patients underwent decompressive C1 laminectomy without posterior stabilization for CVJ stenosis with myelopathy from August 2007 to December 2016. All patients were evaluated preoperatively for spinal canal stenosis, cord signal changes, and instability based on preoperative computed tomography, magnetic resonance imaging, and plain dynamogram. We retrospectively reviewed the clinic charts and radiographs for investigating clinical outcomes such as the visual analog scale (VAS), and Ranawat grade scale and complications. Radiographic parameters including pre- and postoperative atlas-dens interval change in flexion and extension, O-C2 angle, C2-C7 Cobb angle, and C2-C7 sagittal vertical axis were measured. Results The mean follow-up time was 41 months. Eight men and 2 women with a mean age of 58 years (range, 45-69 years) were enrolled. Preoperative neck pain by the VAS was improved significantly in all patients (p<0.01). Nine of 10 patients showed improvement on the Ranawat grading scale, but 1 patient who required a Halo-vest due to aggravated instability after surgery remained unchanged. The statistical results of the preoperative and postoperative radiographic measurements were not significant. Conclusion In select patients with certain indications, decompressive C1 laminectomy could be a viable option, especially in the elderly, patients with comorbidity, and patients with poor bone quality.

Pediatric Extracorporeal Membrane Oxygenation in Korea: A Multicenter Retrospective Study on Utilization and Outcomes Spanning Over a Decade

Choi Yu Hyeon,Jhang Won Kyoung,Park Seong Jong,Choi Hee Joung,Oh Min-su,Kwon Jung Eun,Kim Beom Joon,Shin Ju Ae,Lee In Kyung,Park June Dong,Lee Bongjin,Chung Hyun,Na Jae Yoon,Choi Ah Young,Cho Joongbum 대한의학회 2024 Journal of Korean medical science Vol.39 No.3

Background: Over the last decade, extracorporeal membrane oxygenation (ECMO) use in critically ill children has increased and is associated with favorable outcomes. Our study aims to evaluate the current status of pediatric ECMO in Korea, with a specific focus on its volume and changes in survival rates based on diagnostic indications. Methods: This multicenter study retrospectively analyzed the indications and outcomes of pediatric ECMO over 10 years in patients at 14 hospitals in Korea from January 2012 to December 2021. Four diagnostic categories (neonatal respiratory, pediatric respiratory, postcardiotomy, and cardiac-medical) and trends were compared between periods 1 (2012–2016) and 2 (2017–2021). Results: Overall, 1065 ECMO runs were performed on 1032 patients, with the annual number of cases remaining unchanged over the 10 years. ECMO was most frequently used for post-cardiotomy (42.4%), cardiac-medical (31.8%), pediatric respiratory (17.5%), and neonatal respiratory (8.2%) cases. A 3.7% increase and 6.1% decrease in pediatric respiratory and post-cardiotomy cases, respectively, were noted between periods 1 and 2. Among the four groups, the cardiac-medical group had the highest survival rate (51.2%), followed by the pediatric respiratory (46.4%), post-cardiotomy (36.5%), and neonatal respiratory (29.4%) groups. A consistent improvement was noted in patient survival over the 10 years, with a significant increase between the two periods from 38.2% to 47.1% (P = 0.004). Improvement in survival was evident in post-cardiotomy cases (30–45%, P = 0.002). Significant associations with mortality were observed in neonates, patients requiring dialysis, and those treated with extracorporeal cardiopulmonary resuscitation (P < 0.001). In pediatric respiratory ECMO, immunocompromised patients also showed a significant correlation with mortality (P < 0.001). Conclusion: Pediatric ECMO demonstrated a steady increase in overall survival in Korea; however, further efforts are needed since the outcomes remain suboptimal compared with global outcomes.

Health-related Quality of Life Outcomes of Adalimumab for Patients With Rheumatoid Arthritis in Korea

( Myeung-su Lee ),( Chang Hoon Lee ),( Hye Soon Lee ),( Yoon-kyoung Sung ),( Jung Ran Choi ),( Kyungsu Park ),( Mi-kyoung Lim ),( Byoong Yong Choi ),( Hyoun-ah Kim ),( Seung Won Choi ),( Yusun Lee ),( 대한류마티스학회 2021 대한류마티스학회지 Vol.28 No.2

Objective. Rheumatoid arthritis (RA) is a chronic, progressive, autoimmune disorder that impairs patients’ overall health-related quality of life (HRQOL). In this study, we evaluated the effect of adalimumab in Korean patients with active RA on HRQOL. Methods. Patients included in the study had moderate to severe active RA that did not respond to conventional drugs with a Disease Activity Score of 28 joints >3.2 and were biologics-naïve. All patients received adalimumab 40 mg subcutaneously every other week and were followed for 24 weeks. The primary endpoint was the change in baseline Health Assessment Questionnaire Disability Index (HAQ-DI) score at week 24. Secondary endpoints were changes in the EuroQol 5-dimension 3-Level (EQ-5D-3L) baseline score and Short Form 36-Item Health Survey (SF-36) domain scores at weeks 12 and 24 and change in baseline HAQ-DI score at week 12. Results. In total, 91 Korean patients were included. Ninety-three percent of patients were in high disease activity with a baseline mean DAS28 value of 6.1 within all patients. The mean change from baseline in HAQ-DI scores were -0.46 at week 12 and∼0.67 at week 24 (p<0.0001). Additionally, EQ-5D-3L score at weeks 12 and 24 had significantly improved (p<0.0001) compared to baseline. SF-36 at weeks 12 and 24 had significantly improved (p<0.0001, p=0.0001) compared to baseline. Conclusion. Treatment with adalimumab resulted in significant improvement in HAQ-DI, EQ-5D-3L, and SF-36 scores at 12 and 24 weeks in Korean RA patient. (J Rheum Dis 2021;28:68-75)

삼점 신호 평균기법에 의한 요속신호의 잡음 축소 기법

최성수(Seong-Su Choi),이인광(In-Kwang Lee),이상봉(Sang-Bong Lee),박준오(Jun-Oh Park),이수옥(Su-Ok Lee),차은종(Eun-Jong Cha),김경아(Kyung-Ah Kim) 대한전기학회 2009 전기학회논문지 Vol.58 No.8

Uroflowmetry is a convenient clinical test to screen the benign prostatic hyperplasia(BPH) common in the aged men. A load cell is located beneath the urine container to measure the weight of urine. However, it is sensitive to the impact applied on the bottom of the container by the urine stream, which could be a noise source lowering the reliability of the system. With this aim, our study proposed a noise reduction technique by computing ensemble average of the weighted signals that were acquired from three-load cells forming a regular triangle beneath the urine container. Simulated urination experiment was performed with three different collection methods, all of which demonstrated significant noise reduction by ensemble averaging. Furthermore, the best results can be obtained without any special urine collection devices. Thus, our novel method can be usefully applied to uroflowmetry for enhancing measurement in terms of accuracy and reliability.

Intraluminal High-Dose-Rate Brachytherapy for the Tumors of Gastrointestinal Tract

최병옥(Byung Ock Choi),최일봉(Ihl Bhong Choi),정수미(Su mi Chung),김인아(In Ah Kim),최명규(Myoung Gyu Choi),장석균(Suk Kyun Chang),신경섭(Kyeong Sub Shinn) 대한방사선종양학회 1995 Radiation Oncology Journal Vol.13 No.3

목적 : 위장관종양에 대한 고선량율 강내 방사선치료의 결과를 분석하고자 하였다. 방법 : 카톨릭의대 성모병원 치료방사선과에서는 1991년 2월부터 1993년 7월까지 18명의 수술을 할 수 없는 중증의 위장관종양 환자들(식도암-8, 직장암-10)을 대상으로 Iridium-192을 사용하여 원격조정 고선량율 강내 방사선치료에 대한 후향적 분석을 하였다. 연령 분포는 47-87세로, 평균 71세였다. 모든 환자들은 이전에 수술적 조작을 받은적이 없었고, 외부 방사선치료 이후 2주 이내에 고선량율 강내 방사선치료를 하였으며, 고선량율 강내 방사선치료의 일일 조사량은 3-5 Gy(3-4회/1주), 총 조사량은 12-20Gy로 평균 17Gy였다. 외부방사선 총 조사량은 41.4-59.4Gy로 평균 49.6Gy였다. 추적기간은 3개월에서 31개월이었고, 중앙추적기간은 19개월이었다. 결과 : 식도암에서 완전관해와 부분관해는 각각 38%로 같은 결과를 보였으며, 중앙 생존기간과 2년 생존율은 10개월과 13%였다. 직장암 10명 중 60%의 환자에서 부분반응을 보였으며, 완전반응은 없었지만, 모든 환자에서 현저한 증상개선을 보였다. 저자는 고선량율 강내 방사선 일일 조사량 및 총 조사량, 외부방사선 조사량이 국소반응율과 생존율에 미치는 영향을 분석, 조사하였다. 이 중, 고선량율 강내 방사선 일일 조사량 및 총 조사량이 직장암의 국소반응율에 가장 큰 영향을 미쳤으며, 이는 통계적 유의성을 보였다 (p<0.05). 식도암에서는 고선량율 강내 방사선 총 조사량이 국소반응율과 생존율에 각각 영향을 미쳤으나, 이는 통계적 유의성은 없었다. 또한, 외부방사선 조사량은 모든 환자에게서 국소반응율과 생존율에 영향을 미치지 않는 것으로 나타났다. 모든 환자들에게서 치료 후 현저한 증상개선을 보였으며, 합병증은 대부분의 환자에서 발생하였는데, 대개의 경우 그 증상이 미비하였고, 수일 이내에 회복되었다. 결론 : 이 논문에서는 상대적으로 짧은 추적기간과 적은 수의 환자들을 대상으로 분석을 하였으나, 고선량율 강내 방사선치료 조작은 위장관 종양의 치료에서 외부 방사선치료의 추가적 요법으로 사용할 수 있을 것으로 생각된다. Purpose : Intraluminal high dose rate brachytherapy is an accepted treatment for the tumors of GI tract. However, there is only some limited clinical data for intraluminal high dose rate brachytherapy for the tumors of GI tract. Materials and Methods : Between February 1991 and July 1993, 18 patients who have the tumors of GI tract (esophageal cancer-8 cases, rectal cancer-10 cases) were treated with high dose rate Iridium-192 afterloading system (Microselectron-HDR, Nucleron CO, Netherland) at the department of therapeutic radiology, St. Mary's hospital. Catholic university medical college. Age rage was 47-87 years with a mean age 71 years. All patients were treated with intraluminal high dose rate brachytherapy within two weeks after conventional external radiation therapy and received 3-5 Gy/fraction 3-4 times per week to a total dose 12-20 Gy (mean 17 Gy), Standard fractionation and conventional dose were delivered for external radiation therapy. Total dose of external radiation therapy ranged 41.4-59.4 Gy(mean 49.6Gy). Median follow up was 19 months. Results : The analysis was based on 18 patients. The complete response and partial response in esophageal cancer wassimilar (38%). Two year rates for survival and median survival were 13% and 10 months, respectively. Among 10 patients of rectal cancers, partial response was obtained in 6 patients (60%). There was no complete response in the patients with rectal cancer, but good palliative results were achieved in all patients. Conclusion : Although the number of patients was not large and the follow-up period was relatively short, these findings suggested that intraluminal high dose rate brachytherapy could be useful in the treatment of the patients with advanced tumors of GI tract.

A study on the generation status of non-household waste with city type in South Korea

Ah Hyeon Jeon,Kyu Yeon Kim,Sung Su Rhee,Jun Gu Kang,Jun Seok Cha,Gil Jong Oh,Hun Geun Choi 한국폐기물자원순환학회 2011 한국폐기물자원순환학회 학술대회 Vol.2011 No.1