철근콘크리트 초고층 주상복합 건물의 시공 중 구조성능 분석

황영진,김재요,Hwang, Young-Jin,Kim, Jae-Yo 한국전산구조공학회 2015 한국전산구조공학회논문집 Vol.28 No.1

근래 국내 초고층 주상복합 건물에는 철근콘크리트구조가 보편적으로 적용되는데, 이러한 철근콘크리트 초고층 주상복합 건물은 시공 시점에 따라 구조적인 문제가 발생할 수 있다. 따라서, 시공 중인 철근콘크리트 초고층 주상복합 건물에 대하여, 시공 시점별 구조 안전성 및 횡력저항성능을 검토하고자 한다. 이를 위해, 예제 모델로 탑상형의 초고층 주상복합 60층 건물을 선정했고, 기존의 범용구조해석 프로그램을 사용하여 구조해석을 수행하였다. 각 시공 시점별 10층, 20층, 30층, 40층, 50층, 60층 완료모델과 60층 완공단계 모델의 구조성능을 비교하였다. 구조성능 비교를 위해 이 모델들의 고유치해석을 수행하였으며, 횡력저항성능과 부재별 단면성능을 검토하였다. 횡력저항성능 검토를 위해 횡변위비와 층간변위비를 검토했고, 부재별 단면성능 검토는 완공단계에 대한 설계강도비와 시공단계의 설계강도비를 비교하여 부재안전성을 검토하였다. 이 연구를 통해, 시공 중인 철근콘크리트 초고층 건물의 구조 안전성을 검토하고 시공단계에 적합한 구조해석 및 설계하중의 가이드라인을 제시하고자 한다. Recently, the most of domestic high-rise residential complex buildings are constructed with reinforced concrete structures, which may bring structural problems during construction. This study is aimed to analyze structural safety and lateral load-resisting performance of RC high-rise residential complex building under construction. The tower-typed building with 60 floors is selected as a sample model, and numerical analyses are performed. The structural performances of building structures at construction stages, which are resulted form the analyses of numerical models completed up to 10th, 20th, 30th, 40th, 50th, or 60th floor, are compared to those of the completed building structure. For the comparisons of structural performances, modal shapes and fundamental periods of building structures, lateral load-resisting performances, and structural design performances of structural members are considered. The lateral displacement and story drift ratio are analyzed for lateral load-resisting performances, and comparisons of design ratios at construction and design stages are performed for structural design performances of structural members. The guideline of design loads and structural analysis schemes for checking the safety of RC high-rise building under construction is presented.

CPAP 치료 프로그램이 이완형 마비성구어장애자의 과대비성 개선에 미치는 효과

황영진,김하경,정옥란,예미경,Hwang, Young-Jin,Kim, Ha-Kyung,Jeong, Ok-Ran,Ye, Mi-Kyung 한국음성학회 2005 음성과학 Vol.12 No.2

This study aimed at investigating the effects of CPAP therapy on hypernasality in flaccid dysarthria. The subject was a flaccid dysarthric patient with hypernasality. An A-B-A experimental research design was used. The therapy program was conducted 16 sessions. During CPAP therapy, the subjects was required to repeat single-word utterances in the form VNCV. The results showed some improvement in decreasing hypernasality.

족삼리(足三里) 천궁(川芎) 약침(藥鍼)이 Collagen-induced Arthritis에 미치는 영향

황영진,임윤경,이현,Hwang, Young-Jin,Yim, Yun-Kyoung,Lee, Hyun 대한침구의학회 2007 대한침구의학회지 Vol.24 No.4

Objective: The purpose of this study was to observe the effects of Cnidii Rhizoma herbal-acupuncture solution(CR-HAS) at Joksamni($ST_{36}$) on arthritis induced by Collagen II in mice. Methods : The author performed several experimental items. The severity of arthritis, changes of mouse weight, size of the spleen and the degree of stenosis, changes of cytokine level, IgG, IgM and anti-collagen II, changes of immunocyte count, histological changes of the CIA mouse joint were analyzed. Results: 1. In the CR-HA, the arthritis index, the incidence of arthritis, the degree of joint edema was significantly decreased. 2. In the CR-HA, weight, spleen size and stenosis rate was low and maintained as the normal group was. 3. In the CR-HA, cytokine level, IgG, IgM and anti-collagen II were significantly decreased. 4. In the CR-HA, on changes of immunocyte count were maintained to the levels of normal group. 5. In histological changes of the CIA mouse joint, the cartilage destruction and synovial cell proliferation were decreased. Conclusions : These results suggest that CR-HA at the $ST_{36}$ has an important role to control the immune reactions and suppress inflammatory response on the collagen induced rheumatoid arthritis. This study can be a significant supporting evidence that CR-HA will be chosen to be the principal therapy for clinical practice of the rheumatoid arthritis in the future.

응집공정이 세라믹 정밀여과막 파울링에 미치는 영향

황영진 ( Young Jin Hwang ),임재림 ( Jae Lim Lim ),최영종 ( Young Jong Choi ),왕창근 ( Chang Gun Wang ) 대한상하수도학회 2009 상하수도학회지 Vol.23 No.4

성별 및 지역 간 정상 성인의 비성도 연구

황영진(Young Jin Hwang) 한국언어청각임상학회 2007 Communication Sciences and Disorders Vol.12 No.3

배경 및 목적: 비성도 측정은 공명평가에 유용한 요소로서 잘 알려져 있다. 이에, 본 논문에서는 성별 및 지역 간 정상 성인의 비성도 차이를 연구하고, 그에 대한 정상 규준치를 제공하고자 하였다. 방법: 연구에 참여한 피검자는 총 482명(남자 237명, 여자 245명)이었다. 사용된 검사어는 ‘엄마 문장’, ‘동물원 문장’, ‘아저씨 문장’, ‘바닷가 문장’이었다. 실험 전, 연구자는 대상자에게 실험 조건과 실험 방법을 설명하였고, 이해를 돕기 위해 모음 /아/를 이용하여 선행 연습을 실시하였다. 검사어는 무작위 순서로 제시하였다. NasalView를 이용하여 평균 비성도(%)를 구하였고 모든 데이터는 녹음하였다. 결과: 성별 및 지역에 따른 평균 비성도는 ‘엄마 문장’, ‘동물원 문장’, ‘아저씨 문장’, ‘바닷가 문장’ 순으로 높았다. 성별에 따른 문장의 평균 비성도는 ‘동물원 문장’, ‘아저씨 문장’, ‘바닷가 문장’에서 여성이 남성에 비해 높았다. 지역에 따른 문장의 평균 비성도 차이 또한 통계적으로 유의하였다. 논의 및 결론: 성별에 따른 문장의 평균 비성도는 ‘동물원 문장’, ‘아저씨 문장’, ‘바닷가 문장’에서 여성이 남성에 비해 높았다. 지역에 따른 비성도 차이는 모든 문장에서 유의하였다. Background & Objectives: The measurement of nasalance has often been described as a useful component in resonance evaluation. This study aimed to obtain normative nasalance scores and determine differences as a function of gender and residential area. Methods: Four hundred eighty-two subjects participated in this study: 237 males and 245 females from five different residential areas in Korea. The stimuli used in this experiment were four sentences: ‘Mother passage (nasal consonants ratio[ncr]: 100%),’ ‘Zoo sentence(ncr: 50%),’ ‘Uncle sentence(ncr: 0%),’ and ‘Sea sentence(ncr: 0%)’. The test sentences were presented in a random order. The NasalView was used to measure the recorded signals and to obtain mean nasalance values. Results: In the analysis of normative nasalance data as a function of gender and residential area, the order of the average nasalance scores from lowest to highest was ‘Sea sentence,’ ‘Uncle sentence,’ ‘Zoo sentence,’ and ‘Mother sentence’. The average nasalance score was higher in females than in males in ‘Sea sentence,’ ‘Uncle sentence,’ and ‘Zoo sentence.’ In the analysis of normative nasalance data as a function of residential area, the order of the average nasalance scores from highest to lowest was Chungcheong-do, Jeolla-do, Gyeonggi-do, Gangwon-do, and Gyeongsang-do in all sentences except for ‘Mother sentence.’ Discussion & Conclusion: The results provide regional criteria to help evaluate hypernasal and hyponasal speech due to a velopharyngeal inadequacy in a Korean speaker using NasalView. Also, the four reading sentences, which are relatively short in length, could be used effectively for children as well as adults.

다양한 선폭 및 선 간격을 갖는 금속 메쉬에 대한 탄소 나노튜브의 코팅 효과

황영진(Young-Jin Hwang),김부종(Bu-jong Kim),박종설(Jong-seol Park),박진석(Jin-Seok Park) 대한전기학회 2015 대한전기학회 학술대회 논문집 Vol.2015 No.7

동태적 모형 선택법을 이용한 주택가격 예측 변수 분석

황영진 ( Young Jin Hwang ) 한국부동산분석학회 2013 不動産學硏究 Vol.19 No.4

This paper presents a time series forecasting model of the Korean housing prices using the dynamic model selection. This methodology is attractive in that not only model coefficients but also the entire forecasting model (i.e., predictors) are allowed to change over time. It is found that dynamic model selection performs better than other alternative popular forecasting models including conventional regressions, random walk, autoregressive models, and time-varying parameter models. When looked at which sets of predictors are relevant for forecasting in each period, there are noticeable changes in predictors over forecast horizons. For short horizons, housing prices seem to be largely affected by housing market developments and business cycles; however, GDP and consumption seem to play a lesser role during housing market booms. For medium-run horizons, monetary aggregates and financial market variables appear to replace the aforementioned variables and have more predictive power, indicating that portfolio adjustment in asset markets may be a critical factor in housing price changes.

논문(論文) : CFD모사 기법을 이용한 관내 혼화장치내 수두손실 발생 특성 평가

황영진 ( Young Jin Hwang ),임성은 ( Sung Eun Lim ),김성수 ( Seong Su Kim ),박노석 ( No Suk Park ),왕창근 ( Chang Keun Wang ) 대한상하수도학회 2009 상하수도학회지 Vol.23 No.1

한국 주택 가격의 경기 순환: 특징 및 함의

황영진 ( Young Jin Hwang ) 한국부동산분석학회 2015 不動産學硏究 Vol.21 No.4

This paper examines the cyclical characteristics of monthly Korean housing prices using a variety of detrending/filtering methods that take into account several issues in identifying and estimating trend/cycle decomposition. Specifically, the methods we employ include first differences, linear detrending, Hodrick-Prescott filter, band pass filter, Beveridge-Nelson decomposition, and unobserved component models. While the estimated cyclical components exhibit varying behavior across methods (with reasonable interpretation), the author found largely similar patterns for cyclical behavior of housing prices. The overall findings based on estimation results are as follows. First, approximately five cycles of housing prices during the period of 1986-2014 were identified as were additional tentative peaks and trough dates. Second, changing behavior in housing price cycles was identified. Cyclic persistence and volatility tended to decrease over time (in particular, after the Asian financial crisis of 1997). Third, the author provides some evidence that housing market cycles are asynchronous with overall macro cycles. The estimated turning points in housing market cycles do not seem to correspond to official reference cycle dates and the movements of housing prices tend to have lower correlation with aggregate real variables such as the industrial production index and composite cyclical indices. These features are more pronounced during housing market booms.

적층형 도체를 이용한 2병렬 솔레노이드 코일의 교류손실 연구

황영진(Young Jin Hwang),최석진(Sukjin Choi),장기성(Ki Sung Chang),고태국(Tae Kuk Ko) 대한전기학회 2009 대한전기학회 학술대회 논문집 Vol.2009 No.7

전력기기는 일반적으로 상용주파수인 60 Hz의 교류 전원하에서 운용된다. 따라서 고온초전도체를 전력기기에 응용하는데 있어 교류전류나 교류자장에 의한 교류손실 발생 문제는 전력기기의 경제적 운용과 관련하여 중요하게 부각되어 왔다. 또한 고온초전도체에서 발생하는 교류손실은 에너지의 열적 변환으로 인한 냉동부하 문제와도 관련되어 있기 때문에 전력기기의 안정적인 운용을 위해서도 반드시 연구되어야 할 부분이다. 특히 변압기와 같이 유도형 권선이 필요한 전력기기의 경우에는 무유도 권선 형태가 적용되는 다른 전력기기에 비해 교류 손실의 크기가 매우 크기 때문에 이를 줄이기 위한 방안에 대한 연구가 다각도로 이루어지고 있다. 본 연구에서는 임계전류와 인덕턴스의 크기는 동일하지만 권선 형태를 다르게 할 수 있는 유도형 솔레노이드 코일을 제작하였다. 그리고 제작된 솔레노이드 코일의 병렬연결 구조를 달리하여 각각의 구조에 대한 교류손실의 차이를 측정하고 분석하였다. 그리하여 측정된 결과를 토대로 고온초전도 선재를 이용한 솔레노이드 코일에서 교류손실을 줄이기 위한 구조적 방안을 제시하고자 한다.