• 대한기관식도과학회:학술대회논문집
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• 대한기관식도과학회 1982년도 제16차 학술대회연제순서 및 초록
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• pp.9.2-9
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• 1982

최근 문명의 발달과 함께 증가추세를 보이고 있는 여러 형태의 사고(교통사고, 뇌졸중 등)시 응급처치의 일환으로 임상각과에서 시행하고 있는 기관내 삽관혹은 기관절개술은 생명유지에 있어서 꼭 필요한 기본처치라 하겠다. 그러나 응급이라는 말 그대로 조급한 수술 및 그에 따른 제반문제, 술후 불충분한 기관 cannula 관리, 장기간의 삽관 등으로 인해 여러가지 합병증이 발생될 수 있는 것으로 알려져 있으며, 근자에 와서 특히 이비인후과영역에서 심각하게 대두되고 있는 문제가 기관협착증 및 기관 cannula 조거곤난증이라 하겠다. 이는 이차적 감염 및 육아조직의 형성, high tracheostomy, 유소아의 해부학적 구조, 불적절한 cannula의 사용, 기관 전벽의 광범위한 절제, 그외 정신적 요소 등이 원인으로서 작용한다고 한다. 근래 항생제의 개발과 수술 및 치료방법의 진보에 따라 그 빈도가 다소 멸소되었다고 하나 현재까지도 임상각과에서 종종 보고되고 있으며 한국의 홍 등은 과거 10연간 기관절개를 받은 1514 예중 23예( 1.5 %)에서, Meclelland는 389 예중 14 예중 (3.6%)에서 기관협착증이 발생하였다고 하였으며 조등은 363 예중 3예( 1 %), Meade는 212예중 5 %에서 기관 cannula 발거곤난증이 발생하였다고 보고하였다. 치료로서는 크게 나누어서 수술적료법과 보존적료법으로 대별할 수 있는 데 보존적료법중의 하나인 silastic T_tube의 사용은 적절한 기도유지와 함께 삽입하기에 좋은 flexibility 및 경미한 tissue reaction등으로 최근 주목을 받고 있다. 저자들은 최근 교통사고로 인하여 신경외과에서 기관절개술을 시행한 22세된 남자로서, 술후 4개월만에 기관절개 부위의 육아조직의 증식 및 2차적 감염으로 인해 발생한 기관협착증 1예와, 낙상으로 인해 기관절개술을 시행한 5세된 여아로서 수술당시 high tracheostomy 및 기관전벽의 광범위한 절제로 인하여 발생되었을 것이라고 사료되는 기관 Cannula 발거곤난증 1예를 각각 경험하고, silicone T_tube를 약 3개월간 삽입하여 좋은 결과를 얻었기에 문헌적 고찰과 함께 보고하는 바이다.

• Tuberculosis and Respiratory Diseases
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• 제50권6호
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• pp.740-746
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• 2001

Background : A 35-year-old woman was admitted to the emergency room with sudden dyspnea that developed one day prior. The initial Chest X-ray showed multiple bullous changes at the right middle and lower lung field and long standing fibrotic tuberculous changes at the right upper lung field. The left lung field was totally collapsed by an fibrotic old tuberculous lesion. In spite of supportive medical care with oxygen therapy after admission, the radiographic lesions were no significant change but the respiratory distress had worsened. The patient suffered respiratory failure and received mechanical ventilatory support. The HRCT showed a localized tension pneumothorax mimicking multiple giant bullae at the right lower lung field. Immediately after a closed thoracostomy with a 32 French chest tube and air drainage, her vital signs and dyspnea were gradually improved. The patient was successfully weaned from mechanical ventilation after 5 days of mechanical ventilatory support. The patient had received talc pleurodesis through a chest tube to prevent the recurrence of the life-threatening localized pneumothorax. The patient was discharged without recurrence of the pneumothorax.

• Journal of Periodontal and Implant Science
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• 제53권3호
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• pp.218-232
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• 2023

Purpose: This study evaluated the efficacy of a tube-shaped poly(ε) caprolactone - β tricalcium phosphate (PCL-TCP) scaffold with the incorporation of human umbilical cord-derived mesenchymal stem cells (hUCMSCs) and platelet-rich plasma (PRP) for bone regeneration in the procedure of single-stage sinus augmentation and dental implantation in minipigs. Methods: Implants were placed in the bilateral sides of the maxillary sinuses of 5 minipigs and allocated to a PCL-TCP+hUCMSCs+PRP group (n=5), a PCL-TCP+PRP group (n=5), and a PCL-TCP-only group (n=6). After 12 weeks, bone regeneration was evaluated with soft X-rays, micro-computed tomography, fluorescence microscopy, and histomorphometric analysis. Results: Four implants failed (2 each in the PCL-TCP+hUCMSCs+PRP and PCLTCP+hUCMSC groups). An analysis of the grayscale levels and bone-implant contact ratio showed significantly higher mean values in the PCL-TCP+hUCMSCs+PRP than in the PCL-TCP group (P=0.045 and P=0.016, respectively). In fluoromicroscopic images, new bone formation around the outer surfaces of the scaffolds was observed in the PCLTCP+hUCMSCs+PRP group, suggesting a tenting effect of the specially designed scaffolds. Bone regeneration at the scaffold-implant interfaces was observed in all 3 groups. Conclusions: Using a tube-shaped, honeycombed PCL-TCP scaffold with hUCMSCs and PRP may serve to enhance bone formation and dental implants' osseointegration in the procedure of simultaneous sinus lifting and dental implantation.

• 한국정밀공학회지
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• 제29권1호
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• pp.33-40
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• 2012

The scaffold serves as 3D substrate for the cells adhesion and mechanical support for the newly grown tissue by maintaining the 3D structure for the regeneration of tissue and organ. In this paper, we proposed integrated scaffold fabrication system using multi-axis rapid prototyping (RP) technology. It can fabricate various types of scaffolds: arbitrary sculptured shape, primitive shape, and tube shape scaffolds by layered dispensing biocompatible/ biodegradable polymer strands in designated patterns. In order to fabricate the 3D scaffold, we need to generate the plotting path way for the scaffold fabrication system. We design a data processing program - scaffold plotting software, which can convert the 3D STL file, primitive and tube model images into the NC code for the system. Finally, we fabricated the customized 3D scaffolds with high accuracy using the plotting software and the fabrication system.

• Environmental Engineering Research
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• 제22권4호
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• pp.377-383
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• 2017

A tube-type ceramic membrane for microfiltration was developed, and the membrane module comprised of three membranes was also applied to biological carbon and nitrogen removal processes for post-treatment. Manufacturing the microfiltration membrane was successful with the structure and boundary of the coated and support layers within the membrane module clearly observable. Total kjeldahl nitrogen removal from effluent was additionally achieved through the elimination of solids containing organic nitrogen by use of the ceramic membrane module. Removal of suspended solids and colloidal substances were noticeably improved after membrane filtration, and the filtration function of the ceramic membrane could also easily be recovered by physical cleaning. By using the ceramic membrane module, the system showed average removals of organics, nitrogen, and solids up to 98%, 80% and 99.9%, respectively. Thus, this microfiltration system appears to be an alternative and flexible option for existing biological nutrient removal processes suffering from poor settling performance due to the use of a clarifier.

• 대한인간공학회지
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• 제22권3호
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• pp.27-44
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• 2003

An experiment was carried out to compare the suitability in visual tasks between flat and conventional (convex) cathode-ray tube (CRT) displays. The subjects performed visual search tasks during 2-h for detecting target words among distracters presented on the screen. The subjects' visual performance was evaluated with average time and number of errors made to complete the tasks. Visual fatigue after the search tasks was also evaluated in terms of degradations in accommodative power and subjective ratings. Difference was not found in task time between the two displays, but flat CRT showed a lower number of errors than conventional CRT. The difference in number of errors was statistically significant at 0=0.05. Although there was no difference between the displays in degradations of accommodative power, results from the subjective ratings showed that flat CRT yields less fatigue than conventional CRT. The results partially support the hypothesis that panel convexity of CRT displays has a significant effect on the performance and fatigue during visual tasks and thus flat CRT is the better display than conventional one.

• 한국컴퓨터정보학회:학술대회논문집
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• 한국컴퓨터정보학회 2018년도 제58차 하계학술대회논문집 26권2호
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• pp.53-54
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• 2018

최근 화력 발전소 보일러 튜브의 노후화로 인해서 불시정지 빈도수 및 재가동 시간이 늦춰지고 있다. 이는 막대한 경제적, 사회적 손실로 이어지며, 이를 예방하기 위해서는 상태기반 정비가 필요하다. 현재의 상태기반 정비는 센서, 신호 수집장치, 신호 분석단계를 거쳐 전문가가 진단하기 때문에 즉각적으로 대응하기 어려운 문제점이 있어서 설비의 재가동 시간이 늦춰지고 있다. 따라서 본 논문에서는 전문가의 도움 없이 자동으로 상태를 진단하기 위해서 머신러닝 기법 중 하나인 서포트 벡터 머신(SVM)을 이용한 진단 알고리즘을 구현하고, 이를 탑재한 진단장치를 개발하여 비전문가들도 즉각적으로 대응할 수 있게 하여 불시정지 시간과 빈도수를 줄이고자 한다.

• 한국압력기기공학회 논문집
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• 제7권3호
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• pp.8-14
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• 2011

The clogging of the flow area at the tube support plates(TSPs), especially at the upper TSPs results in the water level oscillation of a steam generator during normal operation. A reduction of the TSP flow area causes to increase in pressure drop within the two-phase flow zone, which destabilizes the boiling flow through the tube bundle. This phenomenon was occasionally observed at a few domestic and foreign nuclear power plants. One of the methods for defining the flow area clogging is visual inspection, which is the most effective inspection method. The results of the visual inspection for TSPs' flow area are clogging images on TSPs' quartrefoil lobes. These images are complexly distorted due to lens aberration and external factors like the distance to a subject and angle etc. In this work, we developed the analysis algorithm for clogging image of the TSP flow area of steam generators. For this purpose, we designed an image verification device applicable to the camera employed in the field for visual inspection and then, we demonstrated the validity of image analysis algorithm by using this device and commercial autoCAD program.

• 천문학회보
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• 제39권1호
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• pp.69.1-69.1
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• 2014

We perform an MHD simulation combined with observed vector field data to clarify an eruptive dynamics in the solar flare. We first extrapolate a 3D coronal magnetic field under a Nonlinear Force-Free Field (NLFFF) approximation based on the vector field, and then we perform an MHD simulation where the NLFFF prior to the flare is set as an initial condition. Vector field was obtained by the Soar Dynamics Observatory (SDO) at 00:00 UT on February 15, which is about 90 minutes before the X2.2-class flare. As a result, the MHD simulation successfully shows an eruption of strongly twisted lines whose values are over one-turn twist, which are produced through the tether-cut magnetic reconnection in strongly twisted lines of the NLFFF. Eventually, we found that they exceed a critical height at which the flux tube becomes unstable to the torus instability determining the condition that whether a flux tube might escape from the overlying field lines or not. In addition to these, we found that the distribution of the observed two-ribbon flares is similar to the spatial variance of the footpoints caused by the reconnection of the twisted lines being resided above the polarity inversion line. Furthermore, because the post flare loops obtained from MHD simulation well capture that in EUV image taken by SDO, these results support the reliability of our simulation.

• 한국정보시스템학회지:정보시스템연구
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• 제32권2호
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• pp.87-108
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• 2023

Purpose The main purpose of this study is to improve fake news detection performance by using video information to overcome the limitations of extant text- and image-oriented studies that do not reflect the latest news consumption trend. Design/methodology/approach This study collected video clips and related information including news scripts, speakers' facial expression, and video metadata from YouTube to develop fake news detection model. Based on the collected data, seven combinations of related information (i.e. scripts, video metadata, facial expression, scripts and video metadata, scripts and facial expression, and scripts, video metadata, and facial expression) were used as an input for taining and evaluation. The input data was analyzed using six models such as support vector machine and deep neural network. The area under the curve(AUC) was used to evaluate the performance of classification model. Findings The results showed that the ACU and accuracy values of three features combination (scripts, video metadata, and facial expression) were the highest in logistic regression, naïve bayes, and deep neural network models. This result implied that the fake news detection could be improved by using video information(video metadata and facial expression). Sample size of this study was relatively small. The generalizablity of the results would be enhanced with a larger sample size.