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数据驱动的复杂系统非预期故障诊断通用过程模型 被引量:12
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作者 陈彧赟 侯博文 +1 位作者 何章鸣 王炯琦 《国防科技大学学报》 EI CAS CSCD 北大核心 2017年第6期126-133,共8页
提高对复杂系统非预期故障诊断能力是故障诊断领域的难点。结合非预期故障诊断内涵及基本原理,构建了一种用于复杂系统非预期故障诊断的通用过程模型。该模型采用四层递进结构,包括四个主要模型,即预期(已知)故障检测模型、预期(已知)... 提高对复杂系统非预期故障诊断能力是故障诊断领域的难点。结合非预期故障诊断内涵及基本原理,构建了一种用于复杂系统非预期故障诊断的通用过程模型。该模型采用四层递进结构,包括四个主要模型,即预期(已知)故障检测模型、预期(已知)故障识别模型、非预期(未知)故障检测模型和非预期(未知)故障识别模型。分析了各模型所包含的关键问题及其相应的实现算法,包括检测统计量的构建及评估、故障特征方向提取、故障识别器设计及故障贡献率计算。该通用过程模型规范了复杂系统非预期故障的诊断流程,明确了数据驱动的实现原理。以卫星姿态控制系统为例,验证了非预期故障诊断通用过程模型的有效性。 展开更多
关键词 预期故障诊断 通用过程模型 数据驱动 检测统计量 偏离度 贡献率
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Serum inter-cellular adhesion molecule 1 is an early marker of diagnosis and prediction of severe acute pancreatitis 被引量:8
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作者 Hai-Hang Zhu Lin-Lin Jiang 《World Journal of Gastroenterology》 SCIE CAS CSCD 2012年第20期2554-2560,共7页
AIM:To determine if serum inter-cellular adhesion molecule 1(ICAM-1)is an early marker of the diagnosis and prediction of severe acute pancreatitis(SAP) within 24 h of onset of pain,and to compare the sensitivity,spec... AIM:To determine if serum inter-cellular adhesion molecule 1(ICAM-1)is an early marker of the diagnosis and prediction of severe acute pancreatitis(SAP) within 24 h of onset of pain,and to compare the sensitivity,specificity and prognostic value of this test with those of acute physiology and chronic health evaluation(APACHE)Ⅱscore and interleukin-6(IL-6). METHODS:Patients with acute pancreatitis(AP)were divided into two groups according to the Ranson's criteria:mild acute pancreatitis(MAP)group and SAP group.Serum ICAM-1,APACHEⅡand IL-6 levels were detected in all the patients.The sensitivity,specificity and prognostic value of the ICAM-1,APACHEⅡscore and IL-6 were evaluated. RESULTS:The ICAM-1 level in 36 patients with SAP within 24 h of onset of pain was increased and was significantly higher than that in the 50 patients with MAP and the 15 healthy volunteers(P<0.01).The ICAM-1 level(25 ng/mL)was chosen as the optimum cutoff to distinguish SAP from MAP,and the sensitivity,specificity,positive predictive value,negative predictive value(NPV),positive likelihood ratio and negative likelihood ratio were 61.11%,71.42%,0.6111,0.7142, 2.1382 and 0.5445,respectively.The area under the curve demonstrated that the prognostic accuracy of ICAM-1(0.712)was similar to the APACHE-Ⅱscoring system(0.770)and superior to IL-6(0.508)in distinguishing SAP from MAP. CONCLUSION:ICAM-1 test is a simple,rapid and reliable method in clinical practice.It is an early marker of diagnosis and prediction of SAP within the first 24 h after onset of pain or on admission.As it has a relatively low NPV and does not allow it to be a stand-alone test for the diagnosis of AP,other conventional diagnostic tests are required. 展开更多
关键词 Intercellular adhesion molecule-1 Severe acute pancreatitis Early prediction
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RASSFIA Promoter Hypermethylation as a Prognosis and Diagnosis for Breast Cancer in Vietnamese Population
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作者 Truong Kim Phuong Lao Duc Thuan +1 位作者 Doan Thi Phuong Thao Le Huyen Ai Thuy 《Journal of Life Sciences》 2014年第4期316-321,共6页
Aberrant tumor suppressor gene promoter methylation was associated with the several cancers, including breast cancer, which was the common female deaths in most countries involved in Vietnam. The methylation in tumor ... Aberrant tumor suppressor gene promoter methylation was associated with the several cancers, including breast cancer, which was the common female deaths in most countries involved in Vietnam. The methylation in tumor suppressor genes, including RASSFIA, were the key targets of establishing the potential biomarkers for prognosis and early diagnosis of breast cancer. In present study, with the aim towards using the hypermethylation at CpG islands of promoter of RASSFIA as the biomarker for breast cancer in Vietnamese population, MSP (methyl specific PCR) was carried out to analyze the hypermethylation status ofRASSFIA gene in 115 samples including 95 breast cancer specimens and 20 normal breast tissues from another disease (not breast cancer). All samples were obtained from Ho Chi Minh City Medical Hospital, Vietnam. The known predictive and prognostic factors: HER2/neu overexpression was immunohistochemistry stained as input value for breast cancer specimens. For input value confirmed, the overexpression of p53 protein was also analyzed together with prior immunochemical assay. The results indicated that the hypermethylation of frequencies for methylation of given gene reached 42.1% (P 〈 0.05). In addition, the DNA hypermethylation of RASSFIA gene increased the possibility to be breast cancer with high incidence via calculated of odd ratio (P 〈 0.05). In conclusion, the hypermethylation of candidate genes could be used as the promising biomarkers applying in Vietnamese breast cancer patients. 展开更多
关键词 RASSFIA HYPERMETHYLATION MSP bisulfite modification breast cancer.
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“三重压力”叠加冲击与“双支柱”调控策略研究
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作者 李力 《管理世界》 CSSCI 北大核心 2024年第8期60-80,共21页
近年来,需求收缩、供给冲击、预期转弱“三重压力”成为推动我国经济回升向好需要克服的重要挑战。本文首先在Proxy-SVAR模型中结合符号约束和工具变量同时识别出需求冲击、供给冲击和预期冲击,进一步构建包含金融摩擦和诊断式预期的DSG... 近年来,需求收缩、供给冲击、预期转弱“三重压力”成为推动我国经济回升向好需要克服的重要挑战。本文首先在Proxy-SVAR模型中结合符号约束和工具变量同时识别出需求冲击、供给冲击和预期冲击,进一步构建包含金融摩擦和诊断式预期的DSGE模型对三重冲击进行理论建模。研究发现:需求收缩、供给冲击和预期转弱均会对我国实体经济带来紧缩性压力,且三重不利冲击的相互叠加会形成反馈效应。不利供给变动会进一步放大预期转弱对于产出的不利影响,而预期转弱则会强化需求收缩对产出的紧缩效应。诊断式预期形成机制下经济主体预期的内生变化会进一步加剧三重不利冲击导致的实体经济和信贷市场的波动。基于DSGE模型的机制分析表明:预期转弱引发的资产价格下跌,会加剧不利需求冲击对实体部门的紧缩效应;而不利供给冲击带来的劳动时长与企业R&D投资规模的下降,则会进一步加大预期转弱对实体经济活动的不利影响。政策福利分析表明:逆周期的宏观审慎政策应该搭配审慎型货币政策,且审慎型货币政策应重点关注资产价格,而宏观审慎政策则应主要盯住杠杆率和信贷等变量,同时二者还应根据不同的冲击类型瞄准风险溢价等其他合意指标。 展开更多
关键词 三重压力 双支柱调控 诊断预期 Proxy-SVAR模型 DSGE模型
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中国消费者信心指数脱钩的行为经济学分析 被引量:2
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作者 孙立 《财经科学》 CSSCI 北大核心 2020年第6期105-119,共15页
本文从诊断预期模型出发分析研究中国消费者信心指数中的漂移特征,通过1999-2019年消费者信心预期和满意指数构建粘性因子,并利用央行城镇储户调查数据实证得出:(1)消费者信心指数与现实宏观经济周期脱钩;(2)这种脱钩现象是由于消费者... 本文从诊断预期模型出发分析研究中国消费者信心指数中的漂移特征,通过1999-2019年消费者信心预期和满意指数构建粘性因子,并利用央行城镇储户调查数据实证得出:(1)消费者信心指数与现实宏观经济周期脱钩;(2)这种脱钩现象是由于消费者认知行为中过于看重房地产价格变化并轻视其余经济变量的非理性认知造成的;(3)与消费者相比,具有专业知识的代理人信心指数更趋理性。最后本文给出消费者信心脱钩的心理学解释--"代表性"(representativeness)。 展开更多
关键词 诊断预期 消费者信心 粘性因子 代表性
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SIOOB protein and its clinical effect on craniocerebra injury 被引量:8
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作者 袁雪松 卞晓星 《Chinese Journal of Traumatology》 CAS 2008年第1期54-57,共4页
Objective: To explore the role of S100B protein in the early diagnosis, treatment, and prognosis judgement of craniocerebral injury. Methods: In this study, we reviewed the domestic and foreign research reports abo... Objective: To explore the role of S100B protein in the early diagnosis, treatment, and prognosis judgement of craniocerebral injury. Methods: In this study, we reviewed the domestic and foreign research reports about the relationship between S100B protein and craniocerebral injury. Results: The concentration of S100B protein had a different increase based on the degree of injury in early stage after craniocerebral injury, and the increasing degree of S100B protein showed a positive correlation with the grading of pathogenetic condition and prognosis of craniocerebral injury. Conclusions: S100B protein may be taken as a specific index of early diagnosis, grading of pathogenetic condition, and prognosis judgement after craniocerebral injury. To grasp and regulate the mechanism of neurotoxicity and to elucidate the therapeutic effect of S100B protein will be a research direction in clinical treatment of craniocerebral injury. 展开更多
关键词 Craniocerebral trauma Early diagnosis PROGNOSIS S100B protein
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