• Proceedings of the Korea Association of Information Systems Conference
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• 2001.12a
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• pp.209-215
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• 2001

본 연구에서는 다양한 멀티미디어 기술과 인터넷의 열린 접근성을 이용하여 고등학교 윤리과목에 대해서 폐쇄적 운영이 가능한 학습 시스템을 개발하였다 이 개별 학습별 수업의 요구에 부응하여 학습자와 상호작용이 가능하며 즉각적인 피드백을 통해 학습자에게 적절한 자극을 줌으로써 학습의욕의 고취를 강화할 수 있고 학습자의 능력에 따라 학습의 속도를 조절이 가능하여서 개별학습의 효과를 높여줄 수있도록 계획되었다. 특히 문자, 그래픽, 영상, 음향, 음성 그리고 비디오 등과 같은 여러 미디어를 병합시켜 표현하는 멀티미디어를 교육에 적용시킨 하이퍼미디어 학습 코스웨어는 학습자의 주의력과 상상력을 키워 줄 수 있으며 학습자가 학습에 흥미를 갖고 학습 과정에 능동적으로 참여할 수 있도록 하며 적극적으로 원하는 정보를 선정하고 학습 순서를 조정하는 등 학습 동기가 높은 상호 작용적 학습 환경을 창조하고 자신에게 적합하게 여러 주제로 이동하고 정보를 연결해 보다 융통성 있는 시스템을 이용함으로써 학습의 효과를 높일 수 있음을 살펴보았다. 이러한 멀티미디어의 특성을 이용하여 교수의 효율성을 최대한으로 살리기 위해 고등학교 윤리과목에 대한 멀티미디어 CAI와 폐쇄적으로 운영가능한 학습사이트를 설계 및 개발하였다.

• Tuberculosis and Respiratory Diseases
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• v.45 no.2
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• pp.457-464
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• 1998

This report describes a 5-month follow-up of the efficacy of Herbst oral appliance(OA) in a obstructive sleep apnea syndrome patient who has failed with uvulopalatopharyngoplasty(UPPP) and was unable to tolerate to subsequent nasal continuous positive airway pressure(CPAP) because of mouth air leak. The obstructive sleep apnea and daytime performance were markedly improved by regular home use of OA, and the patient still continues to use OA without complications. It is suggested that OA can be a successful alternative therapeutic modality in patients who are unable to tolerate to nasal CP AP, especially after UPPP.

• Tuberculosis and Respiratory Diseases
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• v.61 no.6
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• pp.533-546
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• 2006

Background: The aim of this study was to determine the effectiveness of self-efficacy promoting pulmonary rehabilitation in patients with chronic obstructive pulmonary disease (COPD). Methods: thirty six patients, with clinically stable COPD were randomly assigned: 18 to a rehabilitation group and another 18 as a control group, The subjects participated in a the self-efficacy promoting pulmonary rehabilitation program for 8 weeks. This program consisted of education, breathing retraining, exercise training, relaxation and counseling. The control group received education only. The outcome variables were self-efficacy, dyspnea, exercise endurance, pulmonary function, and quality of life. Dyspnea was measured using the modified Borg scale. Exercise endurance was measured by the six minute walking distance. The quality of life was measured by the quality of life index for pulmonary disease patients. Results: In the rehabilitation group after performing the self-efficacy promoting pulmonary rehabilitation program, the self-efficacy score, exercise endurance, and quality of life score were higher than the control group (p=0.007, p=0.038, and p=0.039, respectively). and the exertional dyspnea score was significantly lower than controls(p=0.045). However, the dyspnea score and FEV1 were similar after performing the self-efficacy promoting pulmonary rehabilitation program. Conclusion: The self-efficacy promoting pulmonary rehabilitation program is effective to in improve self-efficacy, exertional dyspnea, exercise endurance and quality of life in patients with COPD.

• Clinical and Experimental Pediatrics
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• v.48 no.11
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• pp.1212-1218
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• 2005

Purpose : Forward pulmonary blood flow may be absent in some neonates with Ebstein's anomaly by anatomical or functional pulmonary atresia in association with the elevated pulmonary vascular resistance, patent ductus arteriosus and tricuspid regurgitation. We reviewed the presentation and outcomes of symptomatic neonates with Ebstein's anomaly focusing on the pulmonary atresia. Methods : Clinical presentation and outcome of 15 symptomatic neonates with Ebstein's anomaly seen at Asan medical center from 1998 to 2004 were reviewed. Results : Ten(67%) of 15 patients showed no forward pulmonary blood flow and 6 of them had functional pulmonary atresia. $O_2$ saturation and pH were lower and cardiothoracic(CT) ratio in chest radiography was more increased in the patients with pulmonary atresia than in the patients without pulmonary atresia(P<0.05). pH and CT ratio were not different between the anatomical and functional pulmonary atresia group, but $O_2$ saturation was lower in functional atresia group(P<0.05). 13 patients(87%) were managed with $PGE_1$. 4 of 6 patients with functional pulmonary atresia were treated with inhaled nitric oxide. Surgery was performed in 1 of 5 patients without pulmonary atresia and in 8 of 10 patients with pulmonary atresia during follow-up period(mean 37 months). 3 patients(20%) died and none of patients without pulmonary atresia died. Conclusion : We found that most symptomatic neonates with Ebstein's anomaly had functional or anatomical pulmonary atresia. The neonates with Ebstein's anomaly who had no forward pulmonary blood flow were more symptomatic and needed surgery earlier. Further studies will be needed to distinguish effectively functional and anatomical pulmonary atresia and to manage appropriately neonates with functional atresia.

• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.33 no.7
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• pp.1-8
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• 2005

For study on the unsteady wall interference effect, flows around a circular cylinder in closed test-section wind tunnels have been numerically investigated by solving compressible Navier-Stokes equations. The numerical scheme is based on a node-based finite-volume method with the Roe's flux-difference splitting and an implicit time-integration method coupled with dual time-step sub-iteration. The computed results showed that the unsteady pressure gradient over the cylinder is enhanced by the wall interference, and as a result the fluctuations of lift and drag are augmented. The drag is further increased because of the lower base pressure. The vortex shedding frequency is also increased by the wall interference. The pressure on the test section wall shows the harmonics having the shedding frequency contained in the wall effect.

• Journal of the Korean Solar Energy Society
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• v.34 no.3
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• pp.98-106
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• 2014

The effect of blockage ratio on wind tunnel testing of small vertical-axis wind turbine has been investigated in this study. Height and rotor diameter of the three blades Darrieus vertical axis wind turbine used in present test were 0.4m and 0.35m respectively. We measured the wind speeds and power coefficient at three different wind tunnels where blockage ratio were 3.5%, 13.4% and 24.7% respectively. The test results show that the measured powers have been strongly influenced by blockage ratio, generally increased as the blockage ratio increases. The maximum power at higher blockage ratio has been obtained at relatively high tip speed ratio compared with that at low blockage ratio. The measured power coefficients under high blockage ratio can be improved from proper correction using the simple correction equation based on blockage factor. In present study, the correction error for power coefficient can be less than 5%, however correction effectiveness reveals relatively poor at high blockage ratio and low wind speed.

• The Journal of the Acoustical Society of Korea
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• v.35 no.4
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• pp.319-329
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• 2016

The present study was to test if breathing training in melodic intonation therapy (MIT) ameliorated the articulation intelligibility of Broca's aphasics or not. The experimental group did breathing training (2 stages) that preceded the MIT. In order to evaluate the efficacy of the MIT intervention, the VOT (Voice Onset Time), the TD (Total Delay), the voice sound intensity and the expiratory volume of the subjects, closely associated with articulation intelligibility were measured before and after the intervention. It was shown that, in the experimental group after the MIT intervention, the VOT and TD were increased on bilabial/p/, alveolar consonant /t/, and soft palatal /k/(p < 0.05), but no significant differences were found on affricate /c/ and fricative /s/(p > 0.05). In the control group, no significant increases in the VOT and TD were observed on all articulation points(p > 0.05). The voice sound intensity which influences the verbal articulation increased in the experimental group after the intervention(p < 0.05), whereas no significant changes were observed in the control group. In conclusion, the breathing training in the MIT was found to result in improving the articulation intelligibility of Broca's aphasiacs.

• Restorative Dentistry and Endodontics
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• v.17 no.2
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• pp.343-354
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• 1992

The purpose of this study was to analyze the relationship between linear and volumetric measurements of apical dye penetration in canals obturated by various kinds of methods. The canals of 108 roots without crown were conventionally prepared and randomly assigned to four group. The canals of group I a2 were obturated by lateral condensation with sealer, group II a2 by thermoplasticized low-temperature ($70^{\circ}C$) gutta-percha with sealer, group III by Thermafil endodntic obturation with sealer and group IV by injection-molded thermop-lasticized guttapercha One mm of root apex was exposed to a 2 % methylene blue solution at $7^{\circ}C$or 10 days, and the quality of apical seals was assessed by measuring the leakage linearly and volumetrically. The obtained results were as follows: In linear measurements, group II showed significanty less leakage than group III, I and group III also showed less than group N, but no statistically significant difference was demonstrated between the others. In volumetric measurements, group II showed significantly less leakage than group I and II, and no significant differnce from group III. There was a weak significant correlation between the linear measurement and the volumetric measurement(r=0.3391, P<0.001).

• Pediatric Infection and Vaccine
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• v.28 no.2
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• pp.57-65
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• 2021

School closures during the coronavirus disease 2019 (COVID-19) pandemic have been outlined in studies from different disciplines, including economics, sociology, mathematical modeling, epidemiology, and public health. In this review, we discuss the implications of school closures in the context of the current COVID-19 pandemic. Modeling studies of the effects of school closures, largely derived from the pandemic influenza model, on severe acute respiratory syndrome coronavirus 2 produced conflicting results. Earlier studies assessed the risk of school reopening by modeling transmission across schools and communities; however, it remains unclear whether the risk is due to increased transmission in adults or children. The empirical findings of the impact of school closures on COVID-19 outbreaks suggest no clear effect, likely because of heterogeneity in community infection pressure, differences in school closure strategies, or the use of multiple interventions. The benefits of school closings are unclear and not readily quantifiable; however, they must be weighed against the potential high social costs, which can also negatively affect the health of this generation.

• Journal of Industrial Convergence
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• v.21 no.8
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• pp.97-110
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• 2023

This study presents a systematic literature review aimed at integrating and analyzing the research findings regarding the components of various self-care intervention programs conducted for individuals with chronic obstructive pulmonary disease (COPD) both domestically and internationally. The paper selection criteria were established based on materials from PubMed, CINAHL, EMBASE, /MEDLINE, RISS, DBpia, KISS, and KMbase databases, covering the period from January 1, 2000, to September 30, 2022. The inclusion criteria included controlled pre-post experimental study designs. A total of 23 studies were included in this systematic review. The intervention-related factors examined included the sample size, type of intervention mediator, intervention frequency, and duration. Additionally, factors associated with intervention effects, such as measurement tools and variables, were analyzed. The findings of the analysis support the notion that self-care intervention programs for COPD can contribute to the prevention of symptom exacerbation and hospital readmissions among patients. Consequently, the development of a tailored self-care intervention program specifically designed for COPD patients in South Korea is warranted, considering aspects such as patient accessibility, convenience, and motivation for long-term sustainability.