基于UC/OS的钣金生产线控制器

以PHILIPS公司的型号为LPC2294的ARM单片机为硬件平台,基于实时操作系统UC/OS的同时控制多条钣金生产线的群控系统的设计思想.系统将UC/OS-II的多任务特点与LPC2294所提供的丰富I/O接口相结合,很好地解决了群控控制的复杂以及实时性的难题.实践表明,该方法大大缩短了软硬件开发周期,提高了系统的性价比,而且软件的实时性,可靠性和可扩展性都得到了提高.     

基于UC3842芯片的驱动电路设计

设计了一种新颖的基于ＵＣ３８４２芯片的功率开关器件驱动电路,此电路可以工作在任意占空比,具有高性能、低成本、保护功能强等优点,适用于功率开关器件ＭＯＳＦＥＴ、ＧＴＲ、ＩＧＢＴ的单管驱动。     

基于防篡改硬件模型的UC安全承诺协议

从通用可组合(UC)框架的基本概念出发,分析UC安全性对承诺协议的要求,得出以下结论：朴素模型中不存在UC安全承诺协议是因为承诺协议的安全需求与UC安全性要求间存在矛盾。在此基础上提出一种基于防篡改硬件模型的UC安全承诺协议UCCOM。分析结果表明,UCCOM的安全性不依赖于可信第三方,与同类协议相比,使用的密码学操作更少,效率更高。     

Molecular Background of Toxic-Substances-Induced Morphological Alterations in the Umbilical Cord Vessels and Fetal Red Blood Cells

The relationship between smoking and human health has been investigated mostly in adults, despite the fact that the chemicals originating from sustained maternal smoking disrupt the carefully orchestrated regulatory cascades in the developing fetus. In this study, we followed molecular alterations in the umbilical cord (UC) vessels and fetal red blood cells (RBCs), which faithfully reflect the in vivo status of the fetus. We showed evidence for the decreased level of DNA-PKcs-positive nuclei in samples with smoking origin, which is associated with the impaired DNA repair system. Furthermore, we pointed out the altered ratio of MMP-9 metalloproteinase and its endogenous inhibitor TIMP-1, which might be a possible explanation for the morphological abnormalities in the UC vessels. The presented in vivo dataset emphasizes the higher vulnerability of the veins, as the primary target for the toxic materials unfiltered by the placenta. All these events become amplified by the functionally impaired fetal RBC population via a crosstalk mechanism between the vessel endothelium and the circulating RBCs. In our ex vivo approach, we looked for the molecular explanation of metal-exposure-induced alterations, where expressions of the selected genes were upregulated in the control group, while samples with smoking origin showed a lack of response, indicative of prior long-term in utero exposure.     

Elevated IL-6 and IL-22 in Early Pregnancy Are Associated with Worse Disease Course in Women with Inflammatory Bowel Disease

Inflammatory bowel diseases (IBD), including Ulcerative Colitis (UC) and Crohn’s disease (CD), are inflammatory conditions of the intestinal tract that affect women in their reproductive years. Pregnancy affects Th1- and Th2-cytokines, but how these changes occur during pregnancy in IBD is unclear. We performed a longitudinal profiling of serum cytokines in a cohort of 11 healthy pregnant women and 76 pregnant women with IBD from the first trimester of pregnancy to the first 12 months post-partum. Participants were monitored for biochemical disease activity (C-reactive protein [CRP] and fecal calprotectin [FCP]) and clinical activities. Maternal cytokines were measured using ELISA. We identified changes in Th1 and Th17 cytokines throughout pregnancy in healthy pregnant women. During pregnancy, maternal serum cytokine expressions were influenced by IBD, disease activity, and medications. Active UC was associated with an elevation in IL-21, whereas active CD was associated with elevated IFN-γ, IL-6, and IL-21. Interestingly, T1 serum cytokine levels of IL-22 (>0.624 pg/mL) and IL-6 (>0.648 pg/mL) were associated with worse IBD disease activity throughout pregnancy in women with UC and CD, respectively. This shows serum cytokines in pregnancy differ by IBD, disease activity, and medications. We show for the first time that T1 IL-22 and IL-6 correlate with IBD disease course throughout pregnancy.     

六辊UC轧机轧制过程混沌的轨迹跟踪控制

采用基于精确反馈线性化的轨迹跟踪控制方法控制六辊UC轧机轧制过程中存在的混沌现象. 这种方法可以根据工业过程或工艺的要求将工业混沌系统控制到任意点或跟踪给定函数, 在具有测量噪声和模型误差的情况下控制仍然有效. 仿真结果说明了该方法的有效性和可行性.     

可信匿名认证协议的研究与设计?

基于可信计算技术,设计可信匿名认证协议,实现用户与服务器间的双向身份认证以及服务器对用户平台的可信性评估。服务器通过为可信用户颁发可多次使用的授权接入证书,以提高工作效率,降低可信平台模块的度量负载。在通用可组合安全模型下的验证结果表明,该协议安全可信,具有高效性、可控性、跨域性等特点。     

基于UC3842的三路输出小功率开关电源设计

针对通信供电系统高效率、小型化、集成化、智能化以及高可靠性的发展趋势,本文以UC3842为PWM 控制器,采用电阻,TL431和线性光耦等元器件构成电压采样反馈电路,设计了一种48V转+5V, 15V开关稳压电源,主输出（+5VDC@2A）：电压精度为0.5%,纹波为0.4％（峰峰值20mV）;辅助输出1（+15VDC@500mA）：电压精度为2％（14.7V）,纹波为0.13％（峰峰值20mV）;辅助输出2（-15VDC@500mA）：电压精度为2％（-14.7V）,纹波为0.33％（峰峰值50mV）;具有精度高,纹波小,效率高,性能可靠等优点,可广泛应用于各类小功率变换场合。     

基于CPK的Mesh网络漫游认证协议

基于椭圆曲线密码体制的组合公钥技术,采用标识自认证方式,提出一种适用于无线Mesh网络漫游场景、支持规模化应用的认证协议。分析结果表明,该协议具有双向认证、交互次数少、认证的同时实现共享密钥建立的特点,并证明其达到通用可组合安全。