DS(Dempster-Shafer)证据理论具有结合多源数据的能力,在遥感分类中应用越来越广泛。然而,并不是所有数据源利用证据理论结合后都能提高目标类别的基本概率分配(Basic Probability Assignment,BPA),从而提高遥感分类效果。如何对证据结...DS(Dempster-Shafer)证据理论具有结合多源数据的能力,在遥感分类中应用越来越广泛。然而,并不是所有数据源利用证据理论结合后都能提高目标类别的基本概率分配(Basic Probability Assignment,BPA),从而提高遥感分类效果。如何对证据结合的效果进行评价已成为应用证据理论的一个关键问题。本文提出了评价证据结合效果的证据结合指数(evidence combine index,eci),选择TM影像的第5、7波段作为验证eci的多源数据,应用eci评价证据结合效果,利用证据理论遥感分类Kappa系数的变化对证据结合指数进行了验证。结果表明,该指数能够反映证据理论结合效果,为定量评价证据理论结合多源数据效果奠定了基础。展开更多
Objective: To evaluate relations between production and conjugation of biliru bin in the pathophysiology of jaundice in glucose- 6- phosophate dehydrogenase (G6PD) deficient neonates. Methods: Term and borderline prem...Objective: To evaluate relations between production and conjugation of biliru bin in the pathophysiology of jaundice in glucose- 6- phosophate dehydrogenase (G6PD) deficient neonates. Methods: Term and borderline premature (35- 37 week s gestational age), healthy, male, G6PD deficient neonates were studied close to the beginning of the 3rd day. Blood carboxyhaemogobin corrected for inspired CO (COHbc; an index of bilirubin production) and serum total conjugated bilirubin (TCB; a reflection of bilirubin conjugation) were measured in simultaneously dra wn blood samples by gas chromatography and reverse phase high performance liquid chromatography respectively. A bilirubin production- conjugation index compris ing COHbc/TCB was determined; a high index reflects imbalance between the biliru bin production and conjugation processes. COHbc and TCB individually and the pro duction- conjugation index were studied in relation to serum total bilirubin (S TB)- concentration. Results: Fifty one G6PD deficient neonates were sampled at 51 (8) hours. COHbc values did not correlate with STB (r = 0.22, p = 0.15). TCB did correlate inversely with STB (r = - 0.42, p = 0.004), and there was a posit ive correlation between the production- conjugation index and STB (r = 0.45, p = 0.002). The production- conjugation index (median (interquartile range))was h igher in the premature (n = 8) than term neonates (2.31 (2.12- 3.08) v 1.05 (0. 53- 1.81), p = 0.003). This difference was the result of changes in TCB. Conclu sions: The data show that jaundice in G6PD deficient neonates is the result of a n imbalance between production and conjugation of bilirubin with a tendency for inefficient bilirubin conjugation over increased haemolysis in its pathogenesis. Borderline premature infants are at especial risk of bilirubin production- con jugation imbalance.展开更多
文摘DS(Dempster-Shafer)证据理论具有结合多源数据的能力,在遥感分类中应用越来越广泛。然而,并不是所有数据源利用证据理论结合后都能提高目标类别的基本概率分配(Basic Probability Assignment,BPA),从而提高遥感分类效果。如何对证据结合的效果进行评价已成为应用证据理论的一个关键问题。本文提出了评价证据结合效果的证据结合指数(evidence combine index,eci),选择TM影像的第5、7波段作为验证eci的多源数据,应用eci评价证据结合效果,利用证据理论遥感分类Kappa系数的变化对证据结合指数进行了验证。结果表明,该指数能够反映证据理论结合效果,为定量评价证据理论结合多源数据效果奠定了基础。
文摘Objective: To evaluate relations between production and conjugation of biliru bin in the pathophysiology of jaundice in glucose- 6- phosophate dehydrogenase (G6PD) deficient neonates. Methods: Term and borderline premature (35- 37 week s gestational age), healthy, male, G6PD deficient neonates were studied close to the beginning of the 3rd day. Blood carboxyhaemogobin corrected for inspired CO (COHbc; an index of bilirubin production) and serum total conjugated bilirubin (TCB; a reflection of bilirubin conjugation) were measured in simultaneously dra wn blood samples by gas chromatography and reverse phase high performance liquid chromatography respectively. A bilirubin production- conjugation index compris ing COHbc/TCB was determined; a high index reflects imbalance between the biliru bin production and conjugation processes. COHbc and TCB individually and the pro duction- conjugation index were studied in relation to serum total bilirubin (S TB)- concentration. Results: Fifty one G6PD deficient neonates were sampled at 51 (8) hours. COHbc values did not correlate with STB (r = 0.22, p = 0.15). TCB did correlate inversely with STB (r = - 0.42, p = 0.004), and there was a posit ive correlation between the production- conjugation index and STB (r = 0.45, p = 0.002). The production- conjugation index (median (interquartile range))was h igher in the premature (n = 8) than term neonates (2.31 (2.12- 3.08) v 1.05 (0. 53- 1.81), p = 0.003). This difference was the result of changes in TCB. Conclu sions: The data show that jaundice in G6PD deficient neonates is the result of a n imbalance between production and conjugation of bilirubin with a tendency for inefficient bilirubin conjugation over increased haemolysis in its pathogenesis. Borderline premature infants are at especial risk of bilirubin production- con jugation imbalance.
