Dynamic reflection and refraction of neutrons

Optical phenomena that arise in the interaction of a neutron wave with matter characterized by a variable magnetic-induction vector are considered. Since the interaction is time-dependent, the neutron energy is not conserved. Only the neutron velocity component, which is orthogonal to the matter boundary, changes. The changes in the neutron energy and in direction of propagation are closely related to the reversal of the neutron-spin projection. Possibilities of application of the thin slab with rotating magnetization are considered.     

Risk-sensitive dynamic pricing for a single perishable product

We show that the monotone structures of dynamic pricing for a single perishable product under risk-neutrality are preserved under risk-sensitivity with the additive general utility and atemporal exponential utility functions. We also show that the optimal price is decreasing over the degree of risk-sensitivity under the exponential class of both additive and atemporal utility functions.     

用于脉冲功率装置测量的混合式高压分压器

为准确测量脉冲放电电压,提出了固液混合式高压分压器的原理与结构,并进行了标定和实验测试。用简化模型分析了分压器系统的理想响应条件,讨论了两级分压的衰减特性,提出了控制误差的方法。通过负载标定,得到分压器脉冲电压频率响应大于2.9 MHz,最长脉冲宽度40 s,分压比(或衰减系数)为2.60 kV/V,测量误差小于5%。该高压分压器具有造价低、制作易,同时适于ns到s级脉冲电压的测量等优点,可以在实验室中得到应用。     

A new realization scheme for dynamic PFSCL style

In this paper, a new scheme of logic function realization in dynamic positive feedback source-coupled logic (D-PFSCL) style is proposed. The existing scheme implements only NOR/OR based realization of a logic function. Thus, a complex function in D-PFSCL has high gate count which degrades the overall circuit performance measured in terms of power and delay. This paper therefore aims to resolve the issue by proposing a scheme which modifies the structure of a D-PFSCL gate. The modified gate exhibits AND/OR functionality and is used to realize various functions. Simulations have been carried out by implementing various functions and comparing their performance with the existing schemes at 1 GHz. The results of performance comparison with existing schemes indicates significant reuduction in gate count resulting in overall performance improvement.     

基于火箭遥测的地面站接收信号情况预估方法

火箭尾焰造成的信号衰减是地面测量点位选择重点考虑的问题,通常采用传统β角确定火箭尾焰对遥测地面站接收信号的影响程度。针对新型固体火箭发射中β角分析法对遥测地面站接收信号情况预测不准确的问题,文中在分析影响遥测地面站信号接收因素的基础上,提出了一种采用信号衰减方向性预估遥测地面站接收信号情况的模型。通过分析火箭遥测实测飞行姿态、位置以及地面遥测设备实际跟踪信号情况确定了模型参数,并通过实例计算证明了该方法优的优越性。     

Safe and efficient power management of hard real-time networks-on-chip

The power overhead of Networks-on-Chip (NoCs) becomes tremendous in high density Multiprocessor Systems-on-Chip (MPSoCs). Especially in hard real-time and safety-critical systems, power management mechanisms must be developed and efficiently adhered to real-time requirements. However, state-of-the-art solution typically induces a high timing overhead, thus challenging safety, or has limited power saving capabilities. Additionally, current power-gating mechanisms do not provide an upper bound of the latency overhead, and thus no timing guarantees. We propose a safe and enhanced approach for power-gating that allows a global and dynamic power management under timing guarantees, i.e., all deadlines of critical tasks are met. It introduces a control-layer to save power on the NoC data layer using multiple Power-Aware Traffic-Monitor (PATM) units, which apply knowledge of the global state of the system to efficiently save power on NoC routers even at high NoCs utilizations. To safely apply the PATMs in hard real-time systems while meeting the deadlines, we provide a formal worst-case timing analysis to derive PATMs upper bound latency overhead. Experimental results show that our approach efficiently reduces static power consumption, and provides scalability inducing very small area overhead.     

a-Si:H簿膜的晶化与分形结构的形成

利用透射电子显微镜(TEM)观测a-Si:H 薄膜在不同温度下生长的分形结构。实验方法为原位动态技术。对分形结构的TEM形貌像用Sandbox方法计算了其分形维数。450℃时,形成具有类似分叉状的分形结构,分形线数d_f=1.69;800℃时,形成岛状分形结构,分形维数d_f=1.76。实验结果表明,分形结构的形成与薄膜物性的变化相联系。文中还对分形结构与a =Si:H 薄膜晶化的关系进行了讨论。     

A HYBRID DYNAMIC PROGRAM SLICING

This letter proposes a hybrid method for computing dynamic program slicing. The key element is to construct a Coverage-Testing-based Dynamic Dependence Graph (CTDDG),which makes use of both dynamic and static information to get execution status. The approach overcomes the limitations of previous dynamic slicing methods, which have to redo slicing if slice criterion changes.     

电离层吸收衰减预测方法的比较研究

本文对比分析了利用ITU半经验模型和3种电子碰撞模型预测天波链路电离层吸收衰减的方法.利用中国参考电离层模型和质谱仪非相干散射大气模型构建背景电离层和背景大气,在构建的背景环境中利用三维射线追踪方法仿真分析由半经验模型和3种电子碰撞模型计算得到的电离层吸收衰减与电波频率、出射仰角、大圆距离的关系.并进行了大圆距离100...     

基于Agent的动态负载均衡技术及仿真实现

实现负载均衡需要解决三个关键问题，即负载状况的定义、负载探测以及均衡策略。文章分析了现有负载均衡技术存在的问题．这些问题包括负载探测的间接性，负载均衡的单向性、静态性和主观性等；提出一种基于Multi—Agent的动态负载探测技术和均衡策略，给出了相应的结构模型和算法，并进行了仿真试验，结果表明该技术优于其它负载均衡技术。