特征选择是面向对象信息提取的关键步骤之一。本文针对分离阈值(separability and threshold,SEaTH)这一特征选择方法在实际应用中存在的不足,例如未考虑特征值的离散程度,仅利用J-M距离评判单一特征,特征间可能存在较强相关性,以及无...特征选择是面向对象信息提取的关键步骤之一。本文针对分离阈值(separability and threshold,SEaTH)这一特征选择方法在实际应用中存在的不足,例如未考虑特征值的离散程度,仅利用J-M距离评判单一特征,特征间可能存在较强相关性,以及无法有效确定出分类顺序,提出了一种改进的SEaTH算法(optimized SEaTH,OPSEaTH)。OPSEaTH算法首先在J-M距离基础上构建了一类特征评价指标(E值),有效解决了特征值的离散度问题;然后,基于E值构建出特征组合评价指标(C_(e)值),可有效评估得到每种地物的最佳特征组合并自动确定出地物的分类顺序;最后基于eCognition等分类器可完成对地物对象的最终有效分类。利用高分二号遥感影像数据对本文方法进行了测试,并将结果分别与SEaTH算法、DPC、OIF和最近邻分类器的分类结果进行了对比,结果表明:OPSEaTH算法不仅能有效降低特征维数、优化特征空间,还能够对分类顺序进行自动化合理确定,总体精度和Kappa系数及其他精度指标,均显著优于基于SEaTH算法的特征选择结果。本文方法无论从特征降维效果、分类结果精度还是计算效率方面均优于DPC、OIF和最近邻分类器结果。OPSEaTH是一种更优的特征选择方法。展开更多
China’s domestic animation industry is deeply rooted in its rich traditional cultural heritage.While continuously exploring and showcasing the unique charm of such cultural heritage through storytelling,imagery estab...China’s domestic animation industry is deeply rooted in its rich traditional cultural heritage.While continuously exploring and showcasing the unique charm of such cultural heritage through storytelling,imagery establishment,and spirit creation,Chinese animation also seamlessly integrates modern aesthetic characteristics and cultural values into its development within the context of the new era.By adopting a contemporary perspective,it innovatively expresses the essence of traditional culture while striving to shape and present a reliable,admirable and respectable image of China.Chinese animation aims to create credible contemporary animation images by drawing inspiration from traditional Chinese cultural archetypes.It also seeks to revitalize admirable traditional cultural imagery using vibrant and prevailing ACGN visuals,while shaping credible characters with richer cultural connotations and crafting stories with more enchanting plots to convey the spiritual essence of the Chinese nation.By establishing reliable,admirable and respectable animation images,the Chinese animation industry strives to enhance its capability to“tell China’s stories well and make the voice of China heard,”to better promote the image of China in the new era from a global perspective.展开更多
文摘特征选择是面向对象信息提取的关键步骤之一。本文针对分离阈值(separability and threshold,SEaTH)这一特征选择方法在实际应用中存在的不足,例如未考虑特征值的离散程度,仅利用J-M距离评判单一特征,特征间可能存在较强相关性,以及无法有效确定出分类顺序,提出了一种改进的SEaTH算法(optimized SEaTH,OPSEaTH)。OPSEaTH算法首先在J-M距离基础上构建了一类特征评价指标(E值),有效解决了特征值的离散度问题;然后,基于E值构建出特征组合评价指标(C_(e)值),可有效评估得到每种地物的最佳特征组合并自动确定出地物的分类顺序;最后基于eCognition等分类器可完成对地物对象的最终有效分类。利用高分二号遥感影像数据对本文方法进行了测试,并将结果分别与SEaTH算法、DPC、OIF和最近邻分类器的分类结果进行了对比,结果表明:OPSEaTH算法不仅能有效降低特征维数、优化特征空间,还能够对分类顺序进行自动化合理确定,总体精度和Kappa系数及其他精度指标,均显著优于基于SEaTH算法的特征选择结果。本文方法无论从特征降维效果、分类结果精度还是计算效率方面均优于DPC、OIF和最近邻分类器结果。OPSEaTH是一种更优的特征选择方法。
文摘目的:探讨降钙素原(procalcitonin,PCT)和可溶性白细胞分化抗原14亚型(soluble cell differentiation antigen 14,sCD14,又称presepsin,PSPN)对急性髓系白血病(acute myeloid leukemia,AML)化疗期间发热性中性粒细胞减少症(febrile neutropenia,FN)患者细菌感染的鉴别价值。方法:纳入2018年07月至2022年02月期间在我院接受化疗且出现FN的121例AML患者,分为非细菌感染组化疗期间发生FN且发热原因不明(细菌培养阴性,无临床迹象表明存在感染)与细菌感染组菌血症(血培养阳性)和局部感染(血培养阴性,细菌培养提示局部感染)。通过酶联免疫吸附试验试剂盒检测FN发病第1至3天血浆PCT和PSPN水平。结果:与非细菌感染组相比,细菌感染组患者FN发病第1至3天的PCT和PSPN水平明显更高,差异有统计学意义(P<0.05)。第1、2、3天的PCT水平鉴别FN细菌感染的曲线下面积(area under the curve,AUC)分别为0.882、0.737、0.715,而PSPN诊断AUC分别为0.799、0.729、0.703。此外,PCT和PSPN联用可进一步提高对FN细菌感染诊断的AUC值(0.892、0.808、0.763)。发病第1天PCT≥2.02 ng/mL或者PSPN≥2.40μg/L,FN细菌感染风险显著增加(P<0.05);校正混杂因素后,当PSPN≥2.91μg/L时,AML患者FN细菌感染风险增加2.177~2.624倍(P<0.05)。Spearman相关性分析显示PCT与细菌性脓毒症患者序贯器官功能衰竭评分(sequential organ failure assessment,SOFA)呈正相关(P<0.001),PSPN值与SOFA评分无显著相关性(P>0.05)。结论:PCT较PSPN在区分FN细菌感染性病因和非感染病因方面准确性更高,其浓度与细菌性脓毒症的严重程度有关;二者联用能进一步提高PCT对FN细菌感染的诊断效能。
基金funded by “Multi-dimensional Reconstruction and Symbol Hybridity:Research on Innovative Expression of Traditional Culture in Domestic Animated Films”(WHCY2023B28)a project funded by the Cultural Industry Development Research Center of Sichuan Provincial Key Research Base of Philosophy and Social Sciences+1 种基金funded by “An Intertextual Analysis of Li Bing’s Story from a Cross-media Perspective”(RX2300002875)a research project funded by the Li Bing Research Center at the Sichuan Provincial Key Research Base of Philosophy and Social Sciences
文摘China’s domestic animation industry is deeply rooted in its rich traditional cultural heritage.While continuously exploring and showcasing the unique charm of such cultural heritage through storytelling,imagery establishment,and spirit creation,Chinese animation also seamlessly integrates modern aesthetic characteristics and cultural values into its development within the context of the new era.By adopting a contemporary perspective,it innovatively expresses the essence of traditional culture while striving to shape and present a reliable,admirable and respectable image of China.Chinese animation aims to create credible contemporary animation images by drawing inspiration from traditional Chinese cultural archetypes.It also seeks to revitalize admirable traditional cultural imagery using vibrant and prevailing ACGN visuals,while shaping credible characters with richer cultural connotations and crafting stories with more enchanting plots to convey the spiritual essence of the Chinese nation.By establishing reliable,admirable and respectable animation images,the Chinese animation industry strives to enhance its capability to“tell China’s stories well and make the voice of China heard,”to better promote the image of China in the new era from a global perspective.
