• Journal of Chest Surgery
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• 제12권2호
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• pp.127-134
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• 1979

During the 4 years period to be reported, 34 operations were performed on the mitral valve in the department of Thoracic and cardiovascular surgery, Korea University hospital, from Aug. 1975 to April 1979. At the first 1-year period, the closed technique was used in 12 patients. After that, open-heart surgery was used routinely; 8 patients had open mitral commissurotomy and 14 patients had valve replacement. There were 18 men and 16 women with sex ratio of 1.1: 1. The age of the patients varied widely from 18 years of the youngest to 46 years of the oldest-average aged of 32.5 years. All had symptoms and the mean duration of symptoms was 6 years and 1 month. Preoperative atrial fibrillation was 47% and embolizations were in 3 of 34 patients. The operative mortality was none for the closed and 14% for the open technique combined rate of 9 per cent which were valve thrombosis, brain embolism and left pulmonary vein rupture in deauriculization. But surviving patients undergoing open heart surgery enjoyed symptomatic benefits comparable to these of the patients of closed.

• Restorative Dentistry and Endodontics
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• 제25권3호
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• pp.435-445
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• 2000

The purpose of this study was to compare the leakage of four different obturation techniques in conjunction with immediate apical barrier of ${\beta}$-tricalcium phosphate(TCP) in teeth with open apex. Eighty single-rooted human premolar teeth were prepared and sectioned horizontally, so maximum diameter in apex was 4mm. Apical defects that were similar to open apex, were created with #1/2 round bur and SF104R bur. The apical foramen were opened to a size 80 file extended 3mm beyond the apex. The teeth were placed into the oasis block soaked saline to simulate periapical tissue often associated with pulpless teeth and received apical barriers consisting of TCP followed by obturation using lateral condensation technique, vertical condensation technique, continuous wave technique and thermoplasticized gutta-percha injection technique. Two unobturated teeth served as positive and negative controls. Teeth were immersed in resorcinol-formaldehyde resin for S days at $4^{\circ}C$, and the resin was allowed to polymerize completely for 4 days at room temperature. Teeth were then sectioned horizontally at 1.5mm(level 1), 2.5mm(level 2) and 3.5mm(level 3) from the apex, and examined under a stereomicroscope at ${\times}40$ magnification. The photographs were taken at ${\times}40$ magnification of the filling in each level and scanned. The leakage length in tooth/resin interface was measured at each of the three levels. Each ratio of leakage was obtained by calculating the ratio of the leakage length of canal wall infiltrated with resin to the total length of the canal and was analyzed statistically(One-way ANOVA and Scheffe test). The result were as follows : 1. At the level 1, there was the least leakage in the thermoplasticized gutta-percha injection technique group(group 4), but there was statistically significant(p<0.05). 2. At the level 2, there was the least leakage in the thermoplasticized gutta-percha injection technique group(group 4), and the most leakage in the continuous wave technique group(group 3). There was statistically significant difference between the thermoplasticized gutta-percha injection technique group and the continuous wave technique group(p<0.05). 3. At the level 3, there was the least leakage in the thermoplasticized gutta-percha injection technique group(group 4), but there were no statistically significant differences between other groups(p>0.05). These results suggest that thermoplasticized gutta-percha injection technique which had 1mm apical gutta-percha matrix after the formation of TCP apical barrier, can demonstrate favorable apical sealing.

• 정보처리학회논문지D
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• 제12D권3호
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• pp.335-344
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• 2005

근래들어 구성 요소가 빠른 속도로 지속적으로 발생되는 무한 집합으로 정의되는 데이터 스트림에 대한 개방 데이터 마이닝 방법들이 활발히 제안되고 있다. 데이터 스트림에 내재된 정보들은 시간 흐름에 따른 변화의 가능성이 매우 높다. 따라서, 이러한 변화를 빠른 시간에 분석할 수 있다면 해당 데이터 스트림에 대한 분석에서 보다 유용한 정보를 제공할 수 있다. 본 논문에서는 개방 데이터 마이닝 환경에서 효율적인 최근 빈발 항목 탐색을 위한 이동 윈도우 기법을 제시한다. 해당 기법에서는 데이터 스트림이 지속적으로 확장되더라도 지연 추가 및 전지 작업을 적용하여 마이닝 수행과정에서의 메모리 사용량이 매우 작게 유지되며, 분석 대상 범위의 데이터 객체들을 반복적으로 탐색하지 않기 때문에 각 시점에서 마이닝 결과를 짧은 시간에 구할 수 있다. 더불어, 해당 방법은 데이터 스트림의 최근 정보에 집중한 분석을 통해 해당 데이터 집합의 변화를 효율적으로 감지할 수 있다.

• 한국지역지리학회지
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• 제4권2호
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• pp.139-150
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• 1998

인트라넷 환경에서 개방형 GIS 구축을 위한 사용자 전용의 GUI 개발에 있어서는 GIS의 운용에 필요한 기능을 효과적으로 프로그래밍 할 수 있는 윈도우즈 프로그래밍 기술과 개발된 GUI에 대한 인터넷 연동 기술의 적용이 중요하다. 본 논문에서는 컴포넌트 소프트웨어 제작 기술인 OLE 자동화를 사용하여 GUI를 개발하는 방법과, ActiveX/COM의 표준을 적용한 인터넷 연동 방법을 제시하고, 대구시립 공공 도서관의 GIS 구축 사례를 통하여 제시한 방법의 성과를 평가하였다.

• 경영과학
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• 제10권2호
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• pp.79-91
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• 1993

Strategic decisions related to the design of a physical distribution system can be classified into three basic components : facility location, transportation, inventory decisions. In this research the interdependence of those decisions are expressed in a mathematical model such that the total relevant cost of the system is minimized. We suggested a heuristic technique for solving the model. In broad terms, our solution technique combines a heuristic method for determining which candidate DCs to open and an exact method for minimizing costs given a set of open DCs. And we also developed a decision supporting package for the design of a physical distribution system.

• Archives of Plastic Surgery
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• 제37권4호
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• pp.499-530
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• 2010

Purpose: Lateral osteotomy is an essential step in the correction of nasal bony asymmetry. Direct visualization allows accurate repositioning of the nasal bones compared to blind techniques, which require precision and manual dexterity. We propose direct visualization procedures in open corrective rhinoplasty. Methods: The technique was used on 16 patients. All patients underwent open rhinoplasty with a columellar incision. The marginal incisions were extended on either side to allow access to the piriform aperture. A double hook was used to caudally retract the lower lateral cartilages and the fibrous connections between the upper and lower lateral cartilages were released until the piriform aperture was visualized. Through the incision, lateral osteotomy was performed using a reciprocating saw at that time with direct visualization. Additional procedures including augmentation rhinoplasty, hump resection, septoplasty and tip plasty were performed simultaneously. Results: This method provided excellent exposure to the lateral nasal bones and allowed the lateral osteotomy to be carried out precisely using the reciprocating saw. Conclusion: This extended open rhinoplasty method is suitable for most individuals, allowing a wide surgical field.

• Geomechanics and Engineering
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• 제31권2호
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• pp.209-222
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• 2022

Finite element analyses using coupled Eulerian-Lagrangian technique are performed to investigate the effect of soil conditions on plugging of open-ended piles in sands. Results from numerical simulations are compared against the data from field load tests on three open-ended piles and show very good agreement. A parametric study focusing on determination of the coefficient of lateral earth pressure (K) in soil plug after pile driving are then performed for various soil densities, end-bearing conditions, and layering conditions. Results from the parametric study suggest that the K value in the soil plug - and hence the degree of soil plugging - increases with increasing soil densities. The analysis results further show that the K value within the soil plug can reach about 63 to 71% of the coefficient of passive earth pressure after pile driving. For layered soil profiles, the greater K values are achieved after pile driving when the denser soil layer is present near the pile base regardless of number of soil layers. This study provides comprehensive numerical and experimental data that can be used to develop advanced theory for analysis and design of open-ended pipe piles, especially for estimation of inner shaft resistance after pile driving.

• 정보과학회 논문지
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• 제42권6호
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• pp.713-722
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• 2015

OSS(Open-Source Software)의 사용 증가와 함께 라이선스 위반, 취약한 소스코드 재사용 등에 의한 분쟁 및 피해가 빈번해지고 있다. 이에, 실행파일(바이너리) 수준에서 프로그램에 OSS 모듈이 포함되었는지 여부를 확인하는 기술이 필요해졌다. 본 논문에서는 바이너리에서 함수 수준의 특징정보를 사용하여 OSS 모듈을 탐지하는 기법을 제안한다. 기존 소프트웨어 특징정보(버스마크) 기반 도용 탐지 기법들은 프로그램 전체 간 유사성을 비교하기 때문에 프로그램의 일부로 포함된 OSS 모듈들을 탐지하는데 부적합하다. 본 논문에서는, 함수 수준의 실행명령어, 제어 흐름 그래프(Control Flow Graph)와 개선된 함수 수준 구조적 특징정보를 추출하고 유사성을 비교하여 OSS 모듈의 임의 사용 여부를 탐지한다. 제안기법의 효율성과 각 특징정보들의 OSS 탐지 성능을 평가하기 위해, 특징정보량, OSS 모듈 탐지 시간 및 정확도, 컴파일러 최적화에 대한 강인성을 실험하였다.

• 전자공학회논문지D
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• 제35D권10호
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• pp.7-12
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• 1998

본 논문에서는 다양한 물질에 접촉해 있는 여러 형태의 동축선 끝단에서의 전파반사를 FDTD 방법으로 해석하였다. 3차원의 해석 구조를 2차원 원통 좌표계로 변환하여 매우 효율적으로 계산할 수 있었다. FDTD 계산결과를 통하여, 주파수가 높아지거나 또는 동축선로의 직경이 증가할 때 동축선 끝단에서의 반사크기가 줄어든다는 것을 알았다. 이 방법을 적용하여 다층 구조에서의 전파반사도 해석하였으며, 측정결과와 이론식을 이용하여 본 해석 방법을 검증하였다.

• 대한족부족관절학회지
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• 제25권1호
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• pp.25-31
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• 2021

The open Broström procedure is considered the surgery of choice for treating chronic lateral ankle instability. The role of arthroscopy has gained popularity in the surgical treatment of chronic lateral ankle instability, partly for the ability to manage the intra-articular pathology combined with ankle instability. Arthroscopic techniques can be divided broadly into the arthroscopic-assisted Broström technique and arthroscopic all-inside ligament repair. The clinical results of these arthroscopic techniques are similar to open procedures. The arthroscopic technique may be an excellent alternative to the open Broström procedure in treating chronic lateral ankle instability when applying the appropriate indications.