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김선희,한상섭 한국임학회 2000 한국산림과학회지 Vol.89 No.4
This study was carried out to investigate the characteristics of longitudinal permeability and hydraulic resistance, and to compare the longitudinal permeability (K_E) calculated by the Hagen-Poiseuille's law (Siau, 1971) and the longitudinal permeability (K) measured in sapwood of Acer mono stem. The volume flow rate (Q) in a vessel was 0.80 × 10^(-4) ㎤/sec and the hydraulic resistance (R_s) to viscous flow through a vessel was, on average, 1.37 × 10^(10) dyn · sec · cm^(-3) · cm^(-2) The average value of volume flow rate (Q_N) through the cross section of sapwood was 0.32㎤ · sec^(-1)·cm^(-2) , and the average resistance (R_(SN)) was 3.59×10^6 dyn · sec · cm^(-3) _ cm^(-2) . The values of K decreased as the diameter of stem increases, which was attributable to variations in the number of vessel per unit area rather than in vessel diameter, and to different resistances in the conducting tissues of each part of the stem. The average value of K measured at breast height was 31% of average value of K_E. The K/K_E ratios were 100% in 4 to 6 year-old stems and more than 90% in 7 to 27 year-old stems. The K/K_E ratio decreased as the age of stems increases, and was not more than 20% in near-ground parts of stem.
로지스틱 회귀분석과 다수준 분석을 이용한 Craniotomy 환자의 사망률 평가결과의 일치도 분석
김선희,이광수 보건의료산업학회 2015 보건의료산업학회지 Vol.9 No.2
The purpose of this study was to compare the risk-adjusted in-hospital mortality for craniotomies between logistic regression and multilevel analysis. By using patient sample data from the Health Insurance Review & Assessment Service, in-patients with a craniotomy were selected as the survey target. The sample data were collected from a total number of 2,335 patients from 90 hospitals. The sample data were analyzed with SAS 9.3. From the results of the existing logistic regression analysis and multilevel analysis, the values from the multilevel analysis represented a better model than that of logistic regression. The intra-class correlation (ICC) was 18.0%. It was found that risk-adjusted in-hospital mortality for craniotomies may vary in every hospital. The agreement by kappa coefficient between the two methods was good for the risk-adjusted in-hospital mortality for craniotomies, but the factors influencing the outcome for that were different.
음성정보와 문법정보를 이용한 한국어 운율 경계의 자동 추정
김선희,전재훈,홍혜진,정민화,Kim, Sun-Hee,Jeon, Je-Hun,Hong, Hye-Jin,Chung, Min-Hwa 대한음성학회 2008 말소리 Vol.66 No.-
This paper presents a method for automatically detecting Korean prosodic boundaries using both acoustic and grammatical information for the performance improvement of speech information processing systems. While most of previous works are solely based on grammatical information, our method utilizes not only grammatical information constructed by a Maximum-Entropy-based grammar model using 10 grammatical features, but also acoustical information constructed by a GMM-based acoustic model using 14 acoustic features. Given that Korean prosodic structure has two intonationally defined prosodic units, intonation phrase (IP) and accentual phrase (AP), experimental results show that the detection rate of AP boundaries is 82.6%, which is higher than the labeler agreement rate in hand transcribing, and that the detection rate of IP boundaries is 88.7%, which is slightly lower than the labeler agreement rate.