• Journal of Chest Surgery
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• 제35권3호
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• pp.177-181
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• 2002

배경: 폰탄 술식의 여러 변형에 대한 술후 성적은 시간이 지날수록 점차 향상되고는 있으나 아직까지 만족할 만한 수준은 아니다. 본 교실에서는 향후 폰탄 수술의 변형법의 재고를 위해 최근 실시한 심외도관 폰탄수술의 조기 결과를 분석하고 자기공명촬영술을 이용해 술 후 심외 도관의 내경의 변화를 관찰하였다. 대상및 방법: 1997년 4월부터 2000년 7월까지 본원에서 심외도관 폰탄 수술을 시행한 12명의 환아를 대상으로 후향적 조사를 하였다. 남녀 각각 6명이었고 수술당시 평균연령과 체중은 각각 42.04$\pm$12.43개월(26.5~~65개월)과 13.80$\pm$1.94kg(11.0~l7.9kg)이었다. 평균수술시간은 455$\pm$89.51분(360~615분)이었으며, 평균 체외순환시간은 109.7$\pm$26.99(67~165)분이었다. 모든 례에서 대동맥차단은 필요치 않았으며 10례(83.3%)에서 4mm 혹은 5mm의 Gore-Tex도관을 이용한 심방과의 개통(Fenestration)을 만들어 주었다. 결과: 수술사망 및 술후 사망은 없었으며 술후 모든 환자에서 정상동율동이 유지되었다. 지연 흉막 삼출(Prolonged pleural effusion)은 4례(33.3%)에서 발생하였으며 이 중 4주이상 흉막삼출이 지속되었던 경우가 1례(8.3%)였다 술 후 혈전전색증은 없었으며 단백 소실성 장염이 1례(8.3%)였다. 자기공명혈관촬영(MR angiography)상 전 환자에서 심외도관의 협착이나 혈전은 발견되지 않았고 자기공명촬영술Magnetic resonance image)로 측정한 심외도관의 내경은 평균 17.5$\pm$0.66mm(16.6~18.6mm)로 실제도관의 내경보다 평균 1.9$\pm$0.88mm(9.84$\pm$3.84%)로 좁아져 있어 비교적 매우 넓은 내경을 유지하고 있음을 확인하였다. 추적기간과 내경의 감소의 정도는편상관분석한 결과 상관계수(r)이 0.019로 도출되어 통계학적으로 상관이 없었다(p=0.955). 결론: 심외 도관 폰탄 술식이 단심실의 생리학적 기능을 가진 여러 가지 다양한 복잡 심기형 환자에게 여전히 유용한 수술적 고려가 될 수 있으며 중 단기 추적조사 결과 도관 내경의 감소는 술 후 기간과는 통계학적 상관관계가 없었다.

• 한국산학기술학회논문지
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• 제21권8호
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• pp.557-562
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• 2020

코로나19로 인해서 비대면 강의환경에서 온라인 학습이 교육환경의 주요 학습기법으로 채택되고 있다. 온라인 학습패턴이 학업성적에 어떤 영향을 미치는지에 관한 연구가 부족하여, 본 연구에서는 학습자들의 온라인 동영상 학습횟수와 시간을 주요 요소로 두고, 매 학습에 대한 형성 평가와 함께 중간고사 기말고사를 바탕으로 학습효과의 상관관계를 분석하였다. 분석 대상은 대학에서 예체능 학부 학생들이 가장 어려워하는 교양 과목 중 컴퓨터 프로그래밍 교과목을 분석하였다. 실제 학생들의 사례를 분석한 결과 매주 실시한 형성 평가와 학습회수, 학습 시간과는 상관관계가 없는 것으로 나타났고, 중간고사와 기말고사와는 평소 학습회수(r=.39 p<0.05)와 학습 시간(r=.42 p<0.05)이 상관관계가 있는 것으로 나타났다. 강의 진행 과정에서 SMS 문자, 게시판, 메일 등의 요소는 모든 학생이 접하지 못하여 제외하였으므로, 앞으로는 좀 더 다양한 요인을 고려하여 비대면 강의환경에서의 학습자 패턴을 분석하고 연구한다면 학습자들의 요구와 학습효과를 향상할 수 있을 것이다.

• Journal of Chest Surgery
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• 제47권3호
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• pp.225-232
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• 2014

Background: Redo coronary artery bypass grafting (CABG) is still associated with increased morbidity and mortality as compared to the first-time operation. Further, the application of the off-pump technique to redo CABG is limited due to technical difficulties. The aim of this retrospective study was to analyze early and midterm results after redo CABG and compare the outcome of redo on-pump and off-pump CABG. Methods: From June 1996 to October 2011, elective redo CABG was performed in 32 patients. Mean age was 64.8 years (on pump 64.3 years vs. off pump 65.5 years; p=0.658), and 21 patients were male. Among these patients, 14 (43.8%) underwent on-pump CABG, and 18 (56.2%) underwent off-pump CABG. Results: Internal thoracic artery was used in 22 patients (68.8%), and total arterial revascularization was achieved in 17 patients (53.1%). The average number of distal anastomoses was 2.13, and the rate of incomplete revascularization was 43.8%. The rate of total arterial revascularization was higher in the off-pump group (14.3% vs. 83.3%, p<0.001), and the use of saphenous vein graft was more in the on-pump group (78.6% vs. 16.7%, p<0.001). Overall hospital mortality was 3.1% (n=1) and was comparable in both groups (on pump 7.1% vs. off pump 0%; p=0.249). Postoperative complications occurred in 9 patients (64.2%), and the rate of complications was high in the on-pump group without statistical significance (64.2% vs. 33.3%, p=0.082). The mean follow-up duration was 5.4 years, and overall survival at 10 years was $86.0%{\pm}10.5%$. There was no significant difference in the 10-year survival rate between the two groups (79.6% vs. 100%, p=0.225). Conclusion: Redo CABG can be safely performed with acceptable mortality. Redo off-pump coronary artery bypass is feasible with low mortality and morbidity, comparable target vessel bypass grafting, and long-term survival. The off-pump technique might be considered a safe option for redo CABG in high-risk patients.

• 대한족부족관절학회지
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• 제24권4호
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• pp.135-141
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• 2020

Purpose: This study evaluated the results of two groups-the early group and midterm group-comparatively in the treatment of hallux valgus using a scarf osteotomy. Materials and Methods: From January 2005 to December 2009 (Group 1) and from January 2010 to December 2013 (Group 2), this study compared hallux valgus cases treated by a scarf osteotomy by a single surgeon with at least a five-year follow-up. Results: The average ages of Group 1 and Group 2 were 50.5 and 51.7 years old, respectively. The average follow-up of Groups 1 and 2 were 7.4 and 6.2 years, respectively. Groups 1 and 2 had 86 cases (53 patients) and 93 cases (64 patients) with at least a five-year follow-up, respectively. The average hallux valgus angle (HVA) and 1-2 intermetatarsal angle (IMA) of Group 1 were improved from 31.3° and 13.9° preoperatively to 11.3° and 6.8° at the final follow-up, respectively (p<0.001). The average HVA and 1-2 IMA of Group 2 were improved from 31.7° and 13.4° preoperatively to 8.9° and 6.6° at the final follow-up, respectively (p<0.001). The mean American Orthopaedic Foot and Ankle Society (AOFAS) score of both groups increased from 48.5 and 45.0 points preoperatively to 73.7 and 82.4 points at the final follow-up, respectively. The numbers of patient-assessed subjective satisfaction of Groups 1 and 2 at the final follow-ups were as follows: excellent, 27 and 36 (31.4%, 38.7%); good, 34 and 49 (39.5%, 52.7%); fair, 13 and 5 (15.1%, 5.4%); poor, 12 and 3 (13.9%, 3.2%); respectively. Neither troughing nor stress fractures occurred in both groups. Conclusion: Scarf osteotomy for treating hallux valgus is an excellent surgical method with a relatively low incidence of complications. The results in Group 2 were better than those in Group 1, showing that more surgical experience and evolution of the techniques provided better results.

• 대한수학교육학회지:수학교육학연구
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• 제24권4호
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• pp.573-594
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• 2014

교사의 평가 전문성의 영역 중에서도 평가 문항 제작 능력은 평가의 타당도, 신뢰도에 있어 필수적인 요소이다. 다시 말해, 평가문항의 내용적인 측면과 형식적인 측면에서의 오류는 올바른 평가를 저해하는 요소이며 이러한 평가를 통하여 긍정적 피드백이 이루어질 수 없다. 본 연구는 서울 경기 인천 일반고등학교 45개교 수학과 중간고사와 기말고사 기하와 벡터 60개 시험지의 문항 분석을 통하여 지필평가의 내용적인 측면과 형식적인 측면에서의 문항 오류와 개선점에 대하여 논하고, 이를 통하여 교사들의 평가 문항 제작에 대한 능력 제고를 그 목적으로 하고 있다.

• Journal of Korean Neurosurgical Society
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• 제52권3호
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• pp.187-192
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• 2012

Objective : Stent-assisted coiling on intracranial aneurysm has been considered as an effective technique and has made the complex aneurysms amenable to coiling. To achieve reconstruction of intracranial vessels with preservation of parent artery the use of stents has the greatest potential for assisted coiling. We report the results of our experiences in ruptured wide-necked intracranial aneurysms using Y-stent coiling. Methods : From October 2003 to October 2011, 12 patients (3 men, 9 women; mean age, 62.6) harboring 12 complex ruptured aneurysms (3 middle cerebral artery, 9 basilar tip) were treated by Y-stent coiling by using self-expandable intracranial stents. Procedural complications, clinical outcome, and initial and midterm angiographic results were evaluated. The definition of broad-necked aneurysm is neck diameter over than 4 mm or an aneurysm with a neck diameter smaller than 4 mm in which the dome/neck ratio was less than 2. Results : In all patients, the aneurysm was successfully occluded with no apparent procedure-related complication. There was no evidence of thromboembolic complication, arterial dissection and spasm during procedure. Follow-up studies showed stable and complete occlusion of the aneurysm in all patients with no neurologic deficits. Conclusion : The present study did show that the Y-stent coiling seemed to facilitate endovascular treatment of ruptured wide-necked intracranial aneurysms. More clinical data with longer follow-up are needed to establish the role of Y-stent coiling in ruptured aneurysms.

• Journal of Chest Surgery
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• 제41권5호
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• pp.640-642
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• 2008

고령은 심장이식 후 사망의 위험인자로 상대적 금기로 알려져 왔으나 최근 일부 연구에 의하면 젊은 환자에 비교하여 초기 및 중기 생존률의 통계적 차이가 없다고 보고되고 있다. 평균 수명의 연장과 보전적 투약 치료의 발전으로 심장이식수술이 유일한 치료로서 합당한 고령의 말기 심질환 환자가 증가하는 추세이다. 본 저자들은 78세의 고령의 환자에게 성공적으로 심장이식수술을 시행하였기에 그 사례를 보고하는 바이다.

• 한국콘텐츠학회논문지
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• 제20권7호
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• pp.282-291
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• 2020

본 연구는 PBL 활동에서 교육과정 편성 과제의 구조화 정도에 따라 학생들의 문제해결력에 미치는 영향을 탐색하기 위해서 수행되었다. 연구는 교육과정 수업을 수강하는 대학생 60명을 대상으로 하였다. 학기 초 문제 해결력을 측정하였고, 중간고사 실시 이후에 PBL활동을 수행하였다. 실험집단 30명은 비구조화 된 PBL 형태의 과제를 수행하였고, 비교집단 30명은 반 구조화된 문제를 수행하였다. 과제 종료 후 학기 말에 문제해결력을 측정하였다. 사전·사후 검사 자료의 분석을 위해서 ANCOVA를 사용하였다. 그 결과 실험집단은 비교집단 보다 정보수집요인과 확산적 사고 그리고 평가 및 피드백 수준이 통계적으로 유의미하게 향상되었다.

• 보존과학연구
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• 통권29호
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• pp.255-278
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• 2008

Considering the physical quality of the wall body in this study we tried to select a replenishing that is proper for filling the cracked part of the painting wall layer and apply the natural adhesives that have traditionally been used, investigating whether it is possible to substitute those for the chemical adhesive which is used at present time. The result of this study showed the red algae adhesive was, in a weathering environment, as safe as the synthetic resin originated from the polyvinyl acetate which is used generally on the present spot, and it was concluded that although the starch adhesive displayed its superiority in enhancing the strength of the earth mortar and its work disposition, it seemed proper for it to be used as a filling adhesive for the first or midterm layer because it showed a surface hardening phenomenon. And also the glue and fish glue were judged they were not qualified as a filling adhesive due to mold occurring in a environment of high moisture that is a biological problem, showing at same time a weak physical feature in a weathering environment. Therefore it would be possible to use the red algae adhesive or starch one substituting them for the original one sold on the present market, if among natural adhesives the weak points of the them were to be corrected.

• 한국의류산업학회지
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• 제5권5호
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• pp.539-544
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• 2003

The purpose of this study is to research source of soil which is available for non-detergent course, and to develop optimum non-detergent course of washing machine for water soluble soil. The water soluble soil such as grape juice, soy bean paste and soy sauce were easily removed from the fabric but the oil soluble soils such as sesame oil and steak sauce were insurfficiently removed in washing solution without detergent. In the absence of detergent, amount of residual soils increased linearly with increasing number of soiling and washing. To search optimum conditions of washing for non-detergent course, the effect of temperature, washing time and washing method on detergency of soil in non-detergent washing solution was examined. The optimum washing temperature and washing time for non-detergent course were about $40^{\circ}C$, and 7 minutes, respectively. And in the non-detergent washing solution, midterm drain-resupply of water during washing process was good for removal of water soluble soil.