Environmental Stress and Plants

Land plants are constantly subjected to multiple unfavorable or even adverse environmental conditions. Among them, abiotic stresses (such as salt, drought, heat, cold, heavy metals, ozone, UV radiation, and nutrient deficiencies) have detrimental effects on plant growth and productivity and are increasingly important considering the direct or indirect effects of climate change. Plants respond in many ways to abiotic stresses, from gene expression to physiology, from plant architecture to primary, and secondary metabolism. These complex changes allow plants to tolerate and/or adapt to adverse conditions. The complexity of plant response can be further influenced by the duration and intensity of stress, the plant genotype, the combination of different stresses, the exposed tissue and cell type, and the developmental stage at which plants perceive the stress. It is therefore important to understand more about how plants perceive stress conditions and how they respond and adapt (both in natural and anthropogenic environments). These concepts were the basis of the Special Issue that International Journal of Molecular Sciences expressly addressed to the relationship between environmental stresses and plants and that resulted in the publication of 5 reviews and 38 original research articles. The large participation of several authors and the good number of contributions testifies to the considerable interest that the topic currently receives in the plant science community, especially in the light of the foreseeable climate changes. Here, we briefly summarize the contributions included in the Special Issue, both original articles categorized by stress type and reviews that discuss more comprehensive responses to various stresses.     

FNN与混合遗传算法在智能优化的策略比较

FNN是一种重要的神经网络结构,混合遗传算法是一种正在兴起的启发式随机搜索技术,两者在智能优化中得到了广泛的应用。两者的优化机理不同,方法不同,各有千秋。论文从提高两者的优化性能出发,研究其智能优化的实现策略,并对两者进行了比较,得出了有意义的结论。     

路易斯·康的话语方式和修辞策略

以路易斯·康的论文《Order Is》为例,对法则问题及其研究方法的未来走向进行了思考。     

基于MATLAB的IIR数字滤波器的设计

数字滤波器在数字信号处理领域中已经得到广泛应用,MATLAB软件的频谱分析和滤波器的分析设计功能很强,从而使数字信号处理变得十分简单。利用MATLAB的数字滤波器设计工具箱可以快速有效地设计各种数字滤波器,设计简单方便。介绍了IIR数字滤波器的设计原理、步骤以及在MATLAB中的实现。     

扫描摆镜控制的数字PID实现

介绍了一个应用数字PID技术实现对红外系统扫描摆镜进行控制的电路。首先分析了PID的控制原理及该控制算法的数字实现，然后，给出了该电路的具体实现方法，并附测试结果。     

Statistical analysis of large on-chip power grid networks by variational reduction scheme

One of the most critical challenges in today's CMOS VLSI design is the lack of predictability in chip performance at design stage. One of the process variabilities comes from the voltage drop variations in on-chip power distribution networks. In this paper, we present a novel analysis approach for computing voltage drops of large power grid networks under process variations. The new algorithm is very efficient and scalable for huge networks with a large number of variational variables. This approach, called variational extended truncated balanced realization (varETBR), is based on model order reduction techniques to reduce the circuit matrices before the variational simulation. It performs the parameterized reduction on the original system using variation-bearing subspaces. After the reduction, Monte Carlo based statistical simulation is performed on the reduced system and the statistical responses of the original system are obtained thereafter. varETBR calculates variational response Grammians by Monte Carlo based numerical integration considering both system and input source variations in generating the projection subspace. varETBR is very scalable for the number of variables and flexible for different variational distributions and ranges as demonstrated in experimental results. Experimental results, on a number of IBM benchmark circuits up to 1.6 million nodes, show that the varETBR can be 1900X faster than the Monte Carlo method and is much more scalable than one of the recently proposed approaches.     

TD-SCDMA终端测量过程研究

先对TD-SCDMA终端七种类型的测量进行了介绍,然后基于高层协议对连接模式下的测量过程进行了描述,最后通过一个测试例具体分析了测量的详细实现过程,并给出了详细的流程图。     

嵌入式系统网卡驱动模型设计与实现

以嵌入式系统下网卡驱动的功能为出发点,提出了一种嵌入式系统下网卡驱动设计模型,通过在网络协议层与网卡驱动之间增加一个网卡驱动功能抽象中间层,有效地隔离上层网络协议与底层具体的网卡驱动,使得驱动实现的细节对上层协议透明。中间层作为网卡驱动的抽象层,在提供网卡驱动控制服务的同时,可实现网络层协议与驱动之间的交互;有效地简化网卡驱动的设计工作。通过在合适的平台上进行验证和测试,实验结果证明该模型能有效指导嵌入式系统网卡驱动的设计,网卡驱动能正确,可靠地工作,网络通信功能正常。     

MPLS-TP多业务在OTN中的传送策略与实现

针对现有传输技术在OTN中传送MPLS-TP多业务存在的不足,提出一种在OTN中区分优先级的MPLS-TP多业务传送策略.在分析MPLS-TP多业务特点的基础上,给出了策略的具体实施方法,设计了区分优先级的MPLS-TP多业务传送系统的总体结构,重点阐述了业务入口节点和业务出口节点的实现过程.     

X86结构中微程序ROM的实现技术浅析

微程序控制是X86结构的一个显著特点,深入剖析了X86结构中微程序部件的结构形式,对微程序ROM的结构组织、具体电路的实现形式等问题进行了较为详尽的阐述。