• 한국음향학회지
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• 제42권4호
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• pp.298-303
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• 2023

본 연구는 장애음성의 평가에 사용되는 연속발화과제로서 유성음 문장의 임상적 유용성을 알아보기 위한 것이다. 이를 위해, 모음연장발성과제의 음향학적 측정치인 주파수 변동률(jitter percent, jitter), 진폭 변동률(shimmer percent, shimmer), 소음대배음비(Noise to Harmonic Ratio, NHR)와 유성음으로만 이루어진 연속발화과제의 음향학적 측정치로 캡스트럼 분석 측정치인 켑스트럼 피크 현저성(Cepstral Peak Prominence, CPP), 저주파수대고주파수 스펙트럼비(Low/High spectral ratio, L/H ratio)의 상관을 분석하였다. 음성장애 환자 65명을 대상으로 수집된 자료를 분석한 결과, 유성음 문장의 음향학적 측정치인 CPP와 모음연장발성의 측정치인 jitter(r = -.624, p = .000), shimmer (r = -.530, p = .000), NHR(r = -.469, p = .000) 간에 유의한 상관이 나타났다. 이는 유성음 문장의 캡스트럼 측정치가 '연속발화 과제의 변동률 기반 분석 불가능', '분석구간과 길이에 따른 결과차이' 등 언어재활 임상현장이 가지고 있는 장애음성의 음향학적 분석의 제한에 대한 대안으로 유용하게 사용될 수 있음을 시사한다.

• 한국보육지원학회지
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• 제16권6호
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• pp.253-272
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• 2020

Objective: This study aimed to analyze the counseling contents of daycare center teachers by using text mining and semantic network analysis methods to find the necessary support directions for daycare teachers and to improve the quality of child-care. Methods: Five hundred thirteen cases of counseling recorded on the open bulletin board of online counseling (Naver Bands for Nursery Teacher Counseling) were collected, and frequency analysis, centrality solidarity analysis, and machine learning-based topic analysis were conducted using the NetMiner4.3 program. Results: First, 'teacher-to-child ratio' was highest in the frequency. Second, 'colleagues' were all high in all centrality analysis. Third, machine learning-based topical analysis shows that the topics were categorized as subjects about 'childcare and education', 'working environment that supports professional development' and 'working condition', and among them, 'first-time teacher concerns' accounted for 44% of the total counseling content. Conclusion/Implications: This study implied that it is necessary to provide high-quality child-care and education to infants by lowering the 'teacher-to-child ratio', and a systematic program is needed to help improve effective communication skills in interpersonal relationships such as between parents, fellow teachers, and principals. In addition, self-development and efforts to improve teachers expertise should be prioritized in order to improve infant care quality and quality of teachers.

• 대한한방내과학회지
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• 제37권5호
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• pp.763-769
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• 2016

Objective: To confirm the immediate gait improvement in a post-stroke gait disturbance patient equipped with a weighted vest. Methods: We selected a patient who was able to walk without another’s help or with tools. The selected patient had an unstable gait because she had only started an independent gait within the past week, so we thought that a weighted vest could be very helpful for her. We first collected gait parameters using a treadmill gait analysis system while the patient walked on the treadmill without the weighted vest. After a 10-minute break, gait parameters were collected again while the patient walked on the treadmill while wearing the weighted vest. The gait parameters we collected included step length (cm), stance phase (%), swing phase (%), SW/ST, and gait line length (mm). For objective evaluation of gait improvement, we calculated the ratio of gait parameters of the right and left limbs. Results: The gait of the post-stroke patient was more symmetrical when wearing the weighted vest than without the weighted vest. Without the weighted vest, her step length ratio was 0.78, stance phase ratio was 0.88, swing phase ratio was 1.50, SW/ST ratio was 1.70, and gait line length ratio was 0.91. With the weighted vest, her step length ratio was 0.88, stance phase ratio was 0.90, swing phase ratio was 1.38, SW/ST ratio was 1.54, and gait line length ratio was 0.98. No side effects were observed due to the weighted vest.

• 한국유체기계학회 논문집
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• 제14권3호
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• pp.50-58
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• 2011

To utilize wind resources effectively around buildings in urban area, the magnitudes of wind velocity and turbulence intensity are important, which means the need of the information about the relationship between the magnitude of wind velocity and that of fluctuating wind velocity. In the paper, wind-tunnel experiments were performed to provide the information about Characteristic of Wind flow around buildings with the spanwise distance and the side ratio of buildings as variables. For a single building with the side ratios of one and two, the average velocity ratio was 1.4 and the velocity standard deviation ratio ranged from 1.4 to 2.6 at the height of 0.02m at the corner of the windward side, in which flow separation occurred. For twin buildings with the side ratios of one and two, the velocity ratio ranged from 2 to 2.5 as the spanwise distance varied at the height of 0.02m, and the velocity standard deviation ratio varied near 1.25. For twin buildings with the side ratios of one and two, the maximum velocity ratio was 1.75 at the height of 0.6m, and the maximum velocity standard deviation ratio was 2.1. It was also found from the results of CFD analysis and wind-tunnel experiments that for twin buildings with the side ratios of one and two, the difference between the velocity ratio of CFD analysis and that of wind-tunnel experiments at streamwise distances was near 0.75.

• Clinical and Experimental Reproductive Medicine
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• 제48권4호
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• pp.374-379
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• 2021

Objective: We aimed to evaluate associations between the ratio of serum estrone (E1) to estradiol (E2) and parameters related to serum glucose metabolism and insulin resistance in women with polycystic ovary syndrome (PCOS). Methods: In total, 133 women between the ages of 18 and 35 diagnosed with PCOS were enrolled in this study. All participants with PCOS underwent blood tests to determine hormonal and biochemical metabolic parameters and a standard 2-hour 75-g oral glucose tolerance test. They were divided into two groups according to the serum E1-to-E2 ratio: group 1 (E1/E2 ratio <2.0) and group 2 (E1/E2 ratio ≥2.0). Results: In the comparative analysis, the waist-to-hip ratio (WHR) was the only clinical variable that was significantly different between the two groups. Patients with a higher E1/E2 ratio showed higher fasting insulin levels, homeostasis model for insulin resistance, and postprandial glucose level at 2 hours (PPG2). In a correlation analysis, only PPG2 was significantly related to the serum E1/E2 ratio. However, after controlling for the confounding effects of body mass index (BMI) and WHR, fasting glucose was also significantly correlated with the serum E1/E2 ratio. Conclusion: Women with PCOS with a higher serum E1/E2 ratio were found to be more likely to show higher fasting insulin and postprandial glucose levels. Significant correlations were found between the serum E1/E2 ratio and both fasting and postprandial serum glucose levels after adjusting for BMI and WHR in women with PCOS.

• 한국구조물진단유지관리공학회 논문집
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• 제24권1호
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• pp.97-107
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• 2020

본 연구에서는 화재시 매입형 합성기둥의 높은 축력비에 따른 내화성능을 알아보기 위해 유한요소해석 프로그램(ANSYS)을 통한 해석을 실시하였다. 온도에 따른 응력-변형률 곡선을 적용하여 ASTM E 119 가열곡선과 축력비 0.7, 0.6, 0.5에 따른 과도상태 열전달해석 및 정적구조해석을 실시하였으며, 해석조건과 동일한 조건에서의 재하가열실험을 실시하였다. 또한, 기준식(Eurocode 4)에 따라 가열시간에 따른 합성기둥의 공칭압축강도를 산정하고, 축력비로 나타내어 해석값 및 실험값과 비교하였다. 해석 및 실험과 기준(Eurocode 4)을 통해 가열시간에 따른 단면별 온도분포를 확인하고, 이에 따른 내화성능을 측정해 비교분석하였다. 유한요소해석 결과 축력비 0.5에서는 내화시간 180분으로 실험값과 유사한 값이 도출된 반면, 축력비 0.6, 0.7에서 내화시간 150분과 60분이 도출되어 실험결과에 비해 다소 높은 결과가 도출된 것을 알 수 있었다. 그리고 기준식(Eurocode 4)에 따라 산정한 축력비에 따른 내화시간이 실제 실험값에 비해 다소 낮게 평가하고 있다는 것을 확인하였다. 그러나 축력비 0.7에서는 기준(Eurocode 4)이 실험값에 비해 다소 높게 평가하는 것을 확인하였다. 이에 따라 고축력에서의 매입형 합성기둥의 내화특성(시간-축력비 관계)을 확인하고, 도출된 매입형 합성기둥의 실험 및 해석데이터를 Eurocode기준의 검증의 자료로 활용할 수 있을 것으로 보인다.

• 한국IT서비스학회지
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• 제16권4호
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• pp.15-31
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• 2017

This study analyzes 45 Korea IT service companies from 2012 to 2016 using DEA analysis. Large enterprises, medium enterprises and small and medium enterprises (SMEs). CCR model and BCC model were used for efficiency analysis. Among the various analytical objects, the decision objects which yield the maximum output with minimum input are compared with other analysis objects. The relative inefficiency was measured through this, and Technical Efficiency (TE), Pure Technology Efficiency (PTE), Scale Efficiency (SE), scale profit, reference frequency were analyzed. Also, we analyzed the Technology Gap Ratio (TGR), which is the distance between production function and Meta-Frontier for each firm, using Meta-Frontier analysis. Finally, the Tobit model is used to analyze the sources of efficiency and inefficiency. The inputs are assets, capital, and employees, and the output factor is sales. The analysis shows that large firms are achieving technological achievements more efficiently than small and medium enterprises. As a result, medium-sized enterprises and SMEs can improve efficiency overall through efficient operation of workforce and appropriate combination of inputs such as assets and capital. Also, as a result of the influence factor analysis, it was found that the ratio of the managed asset ratio and the management cost ratio were significant factors influencing the efficiency of the IT service companies. This study suggests the efficiency analysis using DEA for many Korea IT service companies. Inefficient parts of each company are classified according to size and technology. Also, we identify the most efficient companies and analyze the causes of those companies whose profits are lower than their size.

• 에너지공학
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• 제18권2호
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• pp.93-100
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• 2009

습식압축으로 압축소요동력을 줄이고 재생기로 배기가스 에너지를 회수함으로써 열효율을 향상시킬 수 있는 습식압축 재생 브레이튼 사이클에 대하여 엑서지 해석을 수행하였다. 해석모델을 통하여 시스템의 엑서지 효율과 요소별 엑서지 파괴비 및 배기가스로 인한 엑서지 손실비에 미치는 압력비와 물분사율의 영향을 조사하였다. 전형적인 운전조건에 대한 계산 결과 습식압축 재생 가스터빈 사이클에 의하여 엑서지 효율을 상당히 향상시킬 수 있음을 확인하였다. 물 분사 효과는 배기가스의 엑서지 손실의 감소와 출력 동력의 증가로 나타난다.

• 한국가구학회지
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• 제23권3호
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• pp.290-297
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• 2012

Recently, interest in wooden construction have been growing by increasing needs and demands for eco-friendly and traditional wooden building(Hanok). Especially, Hanok has the technical development in manufacturing the mortise-tenon joint without fasteners(precut), so it could be called to modernization, industrialization and popularization. But the structural design and analysis of the structure were not regulated and had the difficulty to consider the variation of wooden member and to conduct the difficulty in the structural analysis and the design of the joint. In this study, the stiffness ratio of wooden mortise and tenon joint was evaluated according to the vertical loading, lintel and loading speed. The joint was distinguished in semi-rigid joint regardless of their factors. The stiffness ratio was 0.40 in vertical loading, 0.50 without vertical loading and 0.44 in horizontal loading with high speed. This study would be utilized to the structural analysis and design with structural analysis and design program.

• 동력기계공학회지
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• 제18권1호
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• pp.45-50
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• 2014

This study focuses on the analysis of the cooling and heating load in accordance with apartment houses arrangement type using Ecotect Analysis. Korea have to reduce energy consumption part of building except in industry and transport because the rate of dependence on imports amounts to 94%, Apartment houses built in various forms in order to reduce energy are modelled in each window area ratio, shape, orientation, and climate through simulation. Through this study, we can analyze the cooling and heating load by form, window area ratio, orientation, and climate change and know the optimal elements by the form. In particular, although there have been done research on the window area ratio and the arrangement form, the research of the regional climate characteristics and the direction are hardly carried out. To supplement those problem, adding to seven direction and climatic element of southern region is characteristic(L Type, Y Type, - Type) of this study. The form of apartment houses built 10 years ago is modelled for simulation.