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Bry-Boschan 알고리즘을 이용한 부산지역 선행종합지수 전환점 분석
서혜성(Seo Hye-Seong),주수현(Joo Soo-Hyeon),유영명(Yoo Young-Myung) 한국지역사회학회 2012 지역사회연구 Vol.20 No.1
The purpose of this article is to analyze the regional business cycle in Busan metropolitan area, especially reviewing its leading composite index. As a result of studying, the following conclusion could be obtained. First, basic statistical data should be accurately examined to raise the usefulness of regional composite. For Busan, it would be desirable to utilize coincident composite index and indices focusing on the Intermediate Goods Shipment Index, Building Permit Area, Composite Stock Price Index, CSI Index made by the Bank of Korea, Import of Capital Goods, Loans for Facilities Investment, Net Barter Terms of Trade. Second, it is confirmed that there has been a high correlation between Busan and Korea in the concept of business cycle phases until 2005. But since then, Busan has steadily lagged behind nationwide movement pattern according to the leading composite index. What's more, time gap between Coincident and Leading Composite Index has shortened. These situations will make it hard to predict regional economic activity. So it is necessary to develop a variety of techniques to analyze many different indices such as diffusion index, econometric model, business survey and consumer sentiment indices.
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서혜성(Hye Seong Seo),김연하(Yeon Ha Kim) 한국아동학회 2014 아동학회지 Vol.35 No.5
This study explored the determinants of smartphone addiction among mothers of infants, focusing on their socio-demographic characteristics, parental stress, and parental knowledge. A total 220 mothers of infants were surveyed and the collected data were analyzed by binary logistic regression. A considerable percentage (16%) of mothers of infants were observed to be at a risk of smartphone addiction, which was significantly higher than the percentage (8%) of adult population at risk of smartphone addiction reported by the Korean government. Parental stress from dysfunctional parent-child relationships was a risk factor and parental knowledge about infant development was observed to be a protective factor when it came to the smartphone addiction of mothers` with infants. However, socio-demographic characteristics (number of children, age, education, family income, and job) did not have statistically significant associations with their smartphone addiction.
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티타늄과 탄소 섬유 강화 PEEK로 구성된 요추 유합술용 연결봉의 의공학적 영향에 대한 비교 분석
서혜성 ( Hye-Sung Seo ),강해성 ( Hae-seong Kang ),전흥재 ( Houng-jae Chun ) 한국복합재료학회 2021 Composites research Vol.34 No.3
요추에 퇴행이 발생하였을 때 이를 치료하기 위해 요추 유합술이 시행된다. 유합술은 척추체 사이의 추간판을 제거하고 뼈 그래프트 등을 삽입하여 굳혀 하나 이상의 분절을 완전히 고정시켜 척추의 안정성을 복원한다. 둘 이상의 척추체가 단단히 유합될 수 있게끔 척추체를 고정하는 수단으로 척추경 나사못과 연결봉이 환자의 체내에 삽입된다. 본 연구에서는 중증 요추 퇴행성 질환의 치료에 쓰이는 척추 유합술에서 사용하는 척추경 나사못 구조물이 적용된 총 7개의 환자 맞춤형 요추 유한 요소 모델을 생성하였다. 생성한 모델에 각각 티타늄과 CFR-PEEK로 구성된 연결봉을 구성하였다. 척추의 4가지 대표적 거동에 대해 유한요소해석과 통계적 분석을 진행하여 연결봉의 재질이 척추 상태에 미치는 의공학적 영향을 조사하였다. 인접 분절의 추간판 내 압력과 각 분절의 관절 구동 범위가 의공학적 영향을 확인하기 위한 지표로 사용되었다. 연결봉에 CFR-PEEK를 사용한 경우 Ti 연결봉에 비해 인접 분절의 추간판 내 압력은 감소하였고 각 분절의 관절 구동 범위는 증가하였다. 그러나 모든 하중 조건에서 통계학적으로 유의미한 경향성 차이는 관찰되지 않았다. The lumbar spinal fusion is a treatment performed to restore the stability of the degenerated lumbar. In this study, the intervertebral discs between two or more segments are removed and a bone graft is inserted to harden the segments. The pedicle screw system is inserted to vertebral bodies to fix two or more segments so that they can be firmly fused. In this study, a total of 7 patient-specific lumbar finite element models were created and pedicle screw systems were installed. The connecting rods made of titanium and CFR-PEEK was inserted to the generated models. Finite element analysis was conducted for four representative spine behaviors and statistical analysis was performed to investigate the biomechanical effects by the material properties of connecting rods. The intradiscal pressure of adjacent segments and the range of motion of the joints of each segment were investigated. In the subjects who used CFR-PEEK instead of Ti for connecting rods, the intradiscal pressure of adjacent segments tend to decrease and the range of motion of each segment tend to increase. However, no statistically significant difference in tendency was observed under all loading conditions.
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