• EDISON SW 활용 경진대회 논문집
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• 제6회(2017년)
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• pp.404-411
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• 2017

이 논문에서는 2차원 화합물 반도체인 Indium Selenide monolayer의 효과적인 도펀트 원소를 탐색해보았다. 총 4가지 종류의 원소를 도핑시켜 계산을 했다. In 자리에 Mg과 Sn을 도핑시켜 각각 p-type과 n-type으로 만들고 Se 자리에 As과 Br을 도핑시켜 각각 p-type과 n-type으로 만들었다. 변화한 성질을 알아보기 위해 전자 구조를 분석하고 band structure와 DOS를 살펴보았다. P-type 같은 경우, Mg doped InSe는 shallow defect level이 생겨 좋은 반도체로 쓰일 수 있지만 As을 도핑한 InSe는 deep defect states가 생겼다. VBM에서 약 0.67 eV만큼 떨어져있는데 이 수치는 실험값과 비슷한 값이다. N-type 경우에는 Sn doped InSe는 deep defect states가 생겼고, CBM 아래로 약 0.08eV만큼 defect가 생긴 것이 실험값과 비슷하다. Br doped InSe는 Sn doped InSe보다 안정적인 n형 반도체가 될 수 있다.

• 한국건축시공학회지
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• 제15권5호
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• pp.491-500
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• 2015

본 연구에서는 공동주택에서 건설 공사비 증가의 원인이 되는 하자에 대하여 건설업체의 공급자 중심이 아닌, 소비자가 법적인 하자보수 책임기간 만기를 앞두고 안전진단 전문기관에 의뢰하여 얻은 하자진단 결과보고서 자료를 근거로 공종별 하자실태를 조사하였다. 또한, 보수비용적 측면에서 세부요인을 분석하여, 시공단계에서의 품질향상과 하자분쟁 해결의 객관적이며 기초적인 자료를 제시하였다.

• 산업경영시스템학회지
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• 제45권4호
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• pp.157-166
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• 2022

In the case of a die-casting process, defects that are difficult to confirm by visual inspection, such as shrinkage bubbles, may occur due to an error in maintaining a vacuum state. Since these casting defects are discovered during post-processing operations such as heat treatment or finishing work, they cannot be taken in advance at the casting time, which can cause a large number of defects. In this study, we propose an approach that can predict the occurrence of casting defects by defect type using machine learning technology based on casting parameter data collected from equipment in the die casting process in real time. Die-casting parameter data can basically be collected through the casting equipment controller. In order to perform classification analysis for predicting defects by defect type, labeling of casting parameters must be performed. In this study, first, the defective data set is separated by performing the primary clustering based on the total defect rate obtained during the post-processing. Second, the secondary cluster analysis is performed using the defect rate by type for the separated defect data set, and the labeling task is performed by defect type using the cluster analysis result. Finally, a classification learning model is created by collecting the entire labeled data set, and a real-time monitoring system for defect prediction using LabView and Python was implemented. When a defect is predicted, notification is performed so that the operator can cope with it, such as displaying on the monitoring screen and alarm notification.

• Journal of Chest Surgery
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• 제17권1호
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• pp.74-77
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• 1984

Left ventricular-Right atrial canal is a rare congenital heart disease. The vast majority of the cases reported in the literature are clinically diagnosed as atrial septal defect or ventricular septal defect. The method of choice in establishing the diagnosis of left ventricular-right atrlal canal is selective left ventriculography. Recently we experienced one case of left ventricular-right atrial canal which was diagnosed as ventricular septal defect preoperatively. The type of defect was tricuspid perforation of infravalvular type, and repaired with direct suture. Postoperative course was uneventful and discharged without complication.

• Journal of Chest Surgery
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• 제12권2호
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• pp.113-118
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• 1979

The muscular variety of congenital ventricular septal defect [Type IV VSD] comprises from 2 to 18% of the total number of patients and has multiple defects. It is difficult to diagnose by usual angiographic study. Out of 116 cases of isolated ventricular septal defects repaired at this hospital in 20 years period from 1959 and to May 8, 1979, 2 cases had muscular defect which was treated through vertical right ventriculotomy without any problems. Single defect was found in both cases and in one case PDA was associated with Type IV VSD.

• 한국세라믹학회지
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• 제41권9호
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• pp.647-652
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• 2004

In aqueous tape casting of alumina slurry systems, the relationships between the suspension compositions and the defects of the dried tapes were discussed. The suspensions compositions were controlled with the ratios of the solids, water and organics binder contents. The effects of the thickness of dried tape and kinds of binder system were also examined. In the defect free region, the apparent viscosity showed nearly same value due to the count balancing effect of solid and organic binder content on the apparent viscosity. When water content was constant, increasing solid led to decrease of organic binder content. The defect free region was narrowed with increasing of casting thickness. When linear type acrylic emulsion binders system (D1000 and D 1035) were used, defect free zone formed the belt type in the triangle of solid, water and organic binder content according to the line of constant water contents. However the defect free region was not found in the cross-link type emulsion binder system (D 1050).

• Journal of Chest Surgery
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• 제8권1호
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• pp.69-74
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• 1975

Twenty-nine cases of ventricular septal defect operated in this department during the period from 1969 to May 1975 were presented. Out of 29 cases, there were 20 cases of type II defects, 8 cases of type I, and one case of type III, and the last case was multiple defect. The anomalies associated with ventricular septal defect were eight in all; three patent ductus arteriosus, one atrial septal defect, one tricuspid insufficiency and an aortic insufficiency. Over all mortality was 17%. The causes of death were complete heart block in a case, respiratory distress due to excessive administration of morphine in one, low cardiac output in two and perforation of the aortic annulus after repair of the ventricular septal defect associated with aortic insufficiency.

• 한국세라믹학회지
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• 제42권1호
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• pp.1-6
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• 2005

In aqueous alumina tape casting, the effects of altering the composition of the suspensions, the binders and the casting thickness were studied. The rheological behavior of the suspensions and the defects of the dried tapes were examined and the relationships between them are discussed. The changes in the defect regions reported in the previous paper were related with the rheological properties with variations of the binder, the composition and the casting thickness. The shear thinning factor increased with the organic content and the solid content (the decrease of water content). The apparent viscosity increased with the shear thinning factor. The relation between the shear thinning factor and the log apparent viscosity was similar for all binder types. In the relation between the defect free region and the rheological properties, the defect free region became narrower with increasing casting thickness. The defect free region is independent of binder type. Therefore, the thicker tape is more difficult to produce in aqueous alumina tape casting. Knowledge of the rheological properties of the suspensions could help Predict the defect type and the possibility of defect free dried tapes.

• Journal of Chest Surgery
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• 제16권3호
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• pp.310-315
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• 1983

The combined anomaly of pulmonary stenosis with atrial or ventricular septal defects is usually associated with decreased pulmonary blood flow and right to left shunt, and result in generalized cyanosis. Non-cyanotic pulmonary stenosis patients have generally been considered to have isolated pulmonary stenosis with intact septa. We are going to report a case of pulmonary stenosis with septal defects who have no frank cyanosis at rest because of the predominant intracardiac shunt from left to right. Recently, we managed surgically a case of pulmonary valvular stenosis combined with secundum type atrial septal defect, type II ventricular septal defect, and patent ductus arteriosus. The clinical manifestations of this patient were exertional dyspnea, frequent upper respiratory infection, chest discomfortness and lethargy since late childhood and these had been progressively aggravated. Pulmonary valvular stenosis, atrial septal defect and ventricular septal defect were closed through simply right atriotomy and patent ductus arteriosus through pulmonary arteriotomy. Immediate postoperative course was uneventful and one year follow up is excellent.

• Journal of Korean Neurosurgical Society
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• 제58권6호
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• pp.528-533
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• 2015

Objective : We sought to examine anatomic variations of the atlas and the clinical significance of these variations. Methods : We retrospectively reviewed 1029 cervical 3-dimensional (3D) CT images. Cervical 3D CT was performed between November 2011 and August 2014. Arcuate foramina were classified as partial or complete and left and/or right. Occipitalization of the atlas was classified in accordance with criteria specified by Mudaliar et al. Posterior arch defects of the atlas were classified in accordance with criteria specified by Currarino et al. Results : One hundred and eight vertebrae (108/1029, 10.5%) showed an arcuate foramen. Bilateral arcuate foramina were present in 41 of these vertebrae and the remaining 67 arcuate foramina were unilateral (right 31, left 36). Right-side arcuate foramina were partial on 18 sides and complete on 54 sides. Left-side arcuate foramina were partial on 24 sides and complete on 53 sides. One case of atlas assimilation was found. Twelve patients (12/1029, 1.17%) had a defect of the atlantal posterior arch. Nine of these patients (9/1029, 0.87%) had a type A posterior arch defect. We also identified one type B, one type D, and one type E defect. Conclusion : Preoperative diagnosis of occipitalization of the atlas and arcuate foramina using 3D CT is of paramount importance in avoiding neurovascular injury during surgery. It is important to be aware of posterior arch defects of the atlas because they may be misdiagnosed as a fracture.