课程文献中心 更多>>

关键词： 神经网络   系统识别   非线性振动  

摘要： 本文从工程应用的实际出发，提出了一种适用于非线性振动系统识别的神经网络模式。文中以非线性振动为物理模型对象，通过时序列脉冲响应的学习实现强制激振响应的预测例，验证了所提出的神经网络模型中的预测结构形式与输入和输出的构成，以及有限学习信息利用方法的有效性。

关键词： 信号处理   信号畸变   信号恢复   神经网络   学习算法  

摘要： 本文主要讨论了快脉冲信号在传输过程中发生畸变后的恢复问题，提出一种神经网络方法。文中给出了网络结构、学习算法。

关键词： 神经网络   瞬态性能   电火工品   实验分析  

摘要： 本文介绍了神经网络在电火工品瞬态脉冲实验分析中的应用,具体说明了训练样本的选取和识别验证的结果。

关键词： 非线性   神经网络   混沌   控制混沌  

摘要： 本文研究一类离散神经网络中的混沌及控制混沌问题 .对一类神经元对中的混沌给出其吸引域划分的规律 .研究了周期比例脉冲方法 (GM方法 )控制混沌的离散神经网络中的应用 ,提出了一种改进的控制方法 ,即变幅值脉冲方法 ,数值实验证明 。

摘要： Flow cytometry was used in the identification of human microsporidia belonging to the genus Encephalitozoon. Microsporidian spores of Encephalitozoon hellem, E. cuniculi, and E. intestinalis were propagated in axenic cultures of monkey kidney E6 cells, purified with Percoll, and exposed to homologous and heterologous rabbit antiserum and monoclonal antibody prepared against E. hellem spores. After reaction to goat anti-rabbit immunoglobulin G (IgG) or goat anti-mouse IgG conjugated to fluorescein isothiocyanate, fluorescence histograms from gated data on light-scatter profiles showed that rabbit anti-E. hellem serum was reactive to E. hellem spores but also had cross-reactivity to spores of E. cuniculi and E. intestinalis. On the other hand, fluorescence histograms showed that rabbit anti-E cuniculi and rabbit anti-E. intestinalis sera were reactive with homologous spores only. Monoclonal antibody prepared against E. hellem reacted only with spores of E. hellem. Neither the polyclonal antibodies nor the monoclonal antibodies reacted with Cryptosporidium parvum oocysts. Fluorescence histograms of spores treated with 10% formalin also showed reactivity, but the number of events in the most intense peaks of fluorescence was fewer (7 to 42%, depending on species) than the number of events in the most intense peaks of fluorescence for nontreated spores. By flow cytometry, formalin-treated and nontreated spores of Encephalitozoon were identified to the species lever by using gated data on Fight-scatter profiles and analyzing the fluorescence histograms from the indirect immunofluorescence of the spores. Once a procedure is established for the isolation of Encephalitozoon spores from clinical specimens, identification of spores by flow cytometry may be useful not only for diagnosis but also for epidemiologic studies.

摘要： We compared memory disorders of three patient groups suffering from brain lesions with a word list corresponding to the California Verbal Learning Test (CVLTgcor). Dependent measures were learning rate and efficiency, retention, and strategic control of the learning process. Compared to a control group of patients with right hemispheric lesions, a left Arteria cerebri posterior (LACP) group showed general memory deficits, an inflated recency effect, and increased serial clustering. A left prefrontal cortex (LPFC) group documented slowed learning and increased recall after semantic cues. Discriminant analysis correctly classified 86.11% of the patients. It is argued that (a) the CVLT helps to cover differences in memory disorders recently discussed in cognitive neuropsychology;(b) differences between PFC and ACP patients become evident only if strategic aspects of learning and increased recall after semantic cueing are taken into account. The results are discussed within the framework of recent cognitive neuropsychological findings and with a distinction between fronto-subcortical and cortical memory disorders.

关键词： adrenal cortical carcinoma   mitotane   cisplatin   etoposide  

摘要： Adrenocortical carcinoma (ACC) is a rare tumour with a poor prognosis. Cisplatin is the most widely tested cytotoxic agent in this disease. A total of 18 patients with advanced ACC were enrolled. Cytotoxic therapy consisted of etoposide (VP16) (100 mg m(-2) day(-1) on days 1-3) and cisplatin (100 mg m(-2) day(-1) on day 1) every 4 weeks. Mitotane treatment was maintained during chemotherapy in 14 patients. A complete response was observed in three cases and a partial response in three cases, giving an overall response rate of 33%. Tumour response was observed in three of the six patients with progressive disease during treatment with mitotane given at an effective dosage, as shown by serum levels >14 mg l(-1). Toxic effects were as expected and were non-life-threatening;no treatment interruption was required.

关键词： 脉冲   时滞   神经网络   稳定性  

摘要： 基于众多领域及生物神经网络本身所存在的脉冲瞬动现象，本文首次提出并研究了带时滞的脉冲型Hopfield神经网络的全局指定稳定性问题，并讨论了其平衡态的存在唯一性．

关键词： 鲸类   脑   认识能力   结构特征  

摘要： 本文总结了有关鲸脑的研究结果，并通过与其他动物进行比较，阐述了鲸类认会。能力与鲸脑在形态结构及生长发育上的进步性的关系。

关键词： 构效关系   脑显像剂   锝99m   脑吸收值  

摘要： 采用多元回归分析方法，对９９Ｔｃｍ标记的两类Ｎ２Ｓ２类脑显像剂配体结构与脑吸收活性关系进行回归分析研究，得到了较为理想的ＱＳＡＲ方程，并且找到了该类脑显像剂影响脑吸收的结构主导因素，提出用脑吸收标度作为度量该类脑显像剂脑吸收值的尺度。