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OMAPL138和FPGA的合并单元设计方案 总被引:1,自引:0,他引:1
提出了一种基于ARM9+DSP双核处理器OMAPL-138和FPGA的合并单元设计方案。给出了该方案的原理框图,以及具体的程序流程图,并在CCS开发环境下完成了软件编程,实现了合并单元按照IEC61850标准规定的格式进行数字量以太网传输。实验结果证明了该设计方案的可行性与正确性,为合并单元的设计提供了一种新的思路。 相似文献
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针对基于PC机和专用运功控制卡的传统数控系统的不足,以及基于ARM和DSP的多处理器在通信上的不足。提出基于多核异构的OMAPL138处理器的嵌入式处理方案,构建CNC控制器的硬件控制系统,同时利用FPGA的现场可编程特性完成控制器扩展模块设计。该设计解决了PC机所缺乏的实时性以及资源的专用性问题和多处理器通信数据丢失、易出错、难维护的缺陷,并实现了现代CNC系统所需求的高性能、模块化、柔性化以及开放性。 相似文献
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从北京地区公众成年人~(232)Th 的膳食日食入量,空气日吸入量,以及骨中~(232)Th 的沉积量出发,利用 ICRP 30号报告中参考人的代谢参数和内照射的库室模型,估算了北京地区公众成年人膳食摄入~(232)Th 后经胃肠道向体液转移份额 f_1值。结果表明,对于公众中成年人0.005是 f_1值的合适代表值,是 ICRP 30号报告推荐值 f_1=0.0002的25倍。虽然 ICRP 推荐值并不用于公众,但可以对群体有所了解;而北京地区从实测数据资料出发导出的 f_1值可能是更适于公众的。 相似文献
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《Journal of Nuclear Science and Technology》2013,50(6):577-580
A calculational model for a modified diffusion coefficient has been developed to incorporate the neutron streaming effect in heterogeneous low-density channels accurately into diffusion theory calculations. The model uses a supercell, and the axial and radial diffusion coefficients of the heterogeneous inner cell are so defined that they can reproduce Benoist's axial and radial diffusion coefficients of the supercell when the diffusion coefficient of the outer cell is given as 1/3 Σtr . In the case of the axial diffusion coefficient, the axial buckling effect is taken into account by modifying the neutron path length within the streaming channel in calculating the collision probabilities. This model has been applied to an RZ fast reactor Core model with a gas expansion module (GEM). By using the axial diffusion coefficient obtained with the presented model, calculational error of GEM worth was reduced to less than 1/7 compared to the formula of Rowlands and Eaton. 相似文献
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针对无人机光电任务载荷轻量化、小型化和高性能的需求,本文基于 ARM+DSP 的双核异构 OMAPL138处理器,设计了一种兼具多任务管理和伺服稳定控制功能的光电任务载荷控制器。设计中扩展了8通道 EMIF总线接口方式的串口,运用了 GDB和CCS相结合的动态双核调试法,实现了利用消息队列和环形缓冲区的核间通信,完成了光电任务载荷的高效准确控制。该设计改善了控制器的体积和功耗,提高了核间通信的速度与可靠性,具有一定的工程应用价值。 相似文献
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基于Protues的16×32点阵LED汉字显示屏的开发 总被引:1,自引:0,他引:1
毛敏 《工业仪表与自动化装置》2010,(5):96-98
Proteus是世界上著名的仿真软件,实现了电路仿真软件、PCB设计软件和虚拟模型仿真软件三合一的设计平台。该文介绍利用Proteus仿真软件开发的基于单片机的16×32点阵LED汉字显示屏,实现了LED点阵屏核心功能即汉字、数字、字母的多样化显示。 相似文献
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Rui Li Wei-Chang Chen Xue-Qin Pang Chen Hua Ling Li Xue-Guang Zhang 《International journal of molecular sciences》2009,10(9):3900-3917
To study expression of CD40 and CD40L in gastric cancer tissue we assessed gastric cancer patients admitted to the Department of Gastroenterology of The First Affiliated Hospital of Soochow University and control subjects. Gastric cancer and normal (from around tumours) tissue samples were obtained from patients. Venous blood samples (gastric cancer and ulcer groups) were drawn on the morning of the day before surgery for the measurement of peripheral sCD40L. The expression of CD40 in gastric carcinoma specimens was examined immuno-histochemically. The clinicopathological factors, including age, sex, tumor size, gross appearance, degree of cellular differentiation, histological classification, depth of tumor invasion, lymph node metastasis, peritoneal dissemination, and TNM stage were analyzed according to the different expression of CD40. The results indicated a high CD40 expression in gastric cancer tissues. This positive expression of CD40 revealed a significant (P < 0.05) correlation with lymphatic metastasis and tumor TNM stage in gastric cancer patients. It is concluded that higher CD40 expression existed in expanding type tumors and could play an important role in clinical diagnosis of gastric cancer patients. 相似文献