危险理论DCA入侵检测算法中阈值预测的研究

免疫危险理论的最新研究成果是树突状细胞算法（Dendritic Cell Algorithm,DCA）.该算法应用在实时入侵检测时具有较优越的性能,该算法通过计算成熟环境抗原值（Mature Context AntigenValue,MCAV）来表示抗原异常度的信息.文章提出了一种基于改进的树突状细胞算法,使算法中的参数其阈值范围可预测,从而能有效的计算成熟环境抗原值表示出模型的异常度.最后通过仿真实验,实验结果表明新算法使树突状细胞算法的异常度量更加精确,算法的检测正确率提高了21.3%～33.5%.     

基于自然语言理解的机械产品需求分析及用例转换研究

本文论述了基于自然语言理解的机械产品需求分析基本模型和用例转换解决方案。在自然语言理解的基础上,通过对ICTCLAS分词系统的优化,利用计算机技术将需求分解为用例元,并对用例元进行分析,以获得产品需求信息和准则。     

ATM网及其实现

本文介绍了 ATM网络的结构原理及工作方式 ,并对信息传输控制做了一定程度的探讨。     

柔性制造系统的单元控制器

从ＦＭＳ递阶控制结构出发，分析出单元控制器的设计是ＦＭＳ研究的重点和难点，着重对单元层控制问题包括单元控制器的功能和软硬件结构进行了阐述，最后综述了当前国内外研究状况并探讨了今后的发展趋势     

光导光度吸光度表达式的简化与应用

考虑各类分光光度计的工作特点,在线状入射光束条件下,从简推导了光导吸收池中按子午线全反射导光时吸光度A的积分表达式,并采用数值积分法计算了A对摩尔吸光系数和浓度的乘积ac、吸收池的长度b以及溶剂的表观散射系数β之间的依赖关系。结果表明,光导吸收池的A仍和c及b有线性响应关系。这为光导吸收池与普通分光光度计配套使用提供了理论依据。     

电池反应与电池及电动势的对应关系

对于一个有不止一种价态的过渡元素及其离子的氧化还原反应，可以对应两种电池，这两种电池的电动势相差简单整数倍；而由汞及其两种离子的溶液组成的两种电池的电动势是相等的。     

Arresting the mitotic oscillator and the control of cell proliferation: insights from a cascade model for cdc2 kinase activation

We consider a minimal cascade model previously proposed¹¹ for the mitotic oscillator driving the embryonic cell division cycle. The model is based on a bicyclic phosphorylation-dephosphorylation cascade involving cyclin and cdc2 kinase. By constructing stability diagrams showing domains of periodic behavior as a function of the maximum rates of the kinases and phosphatases involved in the two cycles of the cascade, we investigate the role of these converter enzymes in the oscillatory mechanism. Oscillations occur when the balance of kinase and phosphatase rates in each cycle is in a range bounded by two critical values. The results suggest ways to arrest the mitotic oscillator by altering the maximum rates of the converter enzymes. These results bear on the control of cell proliferation.     

Microstructural characterization and hydrogenation performance of Zr_xV_5Fe(x=3-9) alloys

Zr_xV_5 Fe(x=3,5,7,8,9) alloys were designed to investigate the influence of Zr addition on hydrogenation performance.The alloys were prepared by arc melting and then annealed at 1273 K for 168 h.The results showed that the alloys were composed of α-Zr and C15-ZrV2 phases.The cell volume of C15-ZrV_2 phase firstly increased and then decreased as the content of Zr increased,while the reversed trend was found for the cell volume of α-Zr phase,which was related to the stoichiometric ratio of elements.α-Zr phase distributed in C15-ZrV2 phase matrix in Zr_xV_5 Fe(x=5,7,8,9) alloys,among which Zr7 V5 Fe alloy showed the best distribution.The PCT curves of the alloys under 623 K,673 K and 723 K showed that the hydrogen absorption plateau pressure of the phases in different alloys decreased gradually with the increasing content of Zr.However C15-ZrV2 phase in Zr7 V5 Fe alloy had the lowest hydrogen absorption plateau pressure at room temperature,which was consistent with the change tendency of the corresponding cell volume.Moreover,the kinetic curves of hydrogen absorption at 623 K revealed that Zr7 V5 Fe alloy with the smallest average particle size and the largest phase boundary area showed the fastest hydrogen absorption kinetics.Compared with other four alloys(including St707 alloy),Zr_7 V_5 Fe alloy is more suitable for the use of getter.     

RBM5蛋白的RNA识别区在肿瘤细胞周期调控中作用的研究

为分析RNA识别区(RNA recognition motif,RRM)在RBM5蛋白调控肿瘤细胞周期中的作用,本研究利用低表达RBM5的A549细胞系构建了A549/Vector、A549/RBM5-WT、A549/RBM5-△RRM三种稳定细胞株,通过流式细胞术检测,发现仅有A549/RBM5-WT能显著阻滞细胞于G1期,说明RRM区是RBM5抑制细胞周期进程必不可少的区域.利用Western Blot检测细胞中cyclin A与Phospho-Rb(ser 795)的蛋白水平差异,证明了RBM5蛋白的RRM能够参与其介导的pRb去磷酸化以及抑制cyclin A表达,从而抑制细胞周期进程.     

Marc-145细胞库的建立及其生物学特性研究

从中国典型培养物保藏中心(CCTCC)引进Marc-145细胞,建立了原始细胞库、主细胞库和工作细胞库,并对工作细胞库的细胞复苏后进行了活力、形态、生长特性、微生物污染、核型、乳酸脱氢酶同工酶和对猪繁殖与呼吸综合征病毒(PRRSV)敏感性等特性进行了鉴定.结果显示,Marc-145细胞为上皮型细胞,生长状态良好,生长曲线呈"S"型,最大增殖浓度为4.71×105/mL,倍增时间为26.1h,细菌、真菌、支原体和红细胞吸附检测均为阴性,染色体核型为2n=60,对PRRSV敏感.建立的细胞,为开展猪繁殖与呼吸综合征病毒及其疫苗研究提供了细胞资源.