A novel multicast routing algorithm in sparse splitting WDM network with power attenuation constraint

With the increasing requirement for communication bandwidth, all-optical network has been more and more important owning to its large traffic capability. Multicasting is an important technology in wavelength division multiplexing (WDM) optical network, and has been studied in many works. In this paper, we consider the multicasting technology on all-optical metropolitan area network (MAN) with maximum power attenuation constraint. The objective is to minimize total cost of a multicasting request. This problem is NP-hard. We propose a heuristic, named Power-Constraint Fix-Destination-Path (PC-FDP) algorithm, to solve this maximal power-loss constrained minimizing cost multicasting problem. It means that, during the process of building a multicasting tree, when a destination is reached and its power satisfies the constraint, the path from source to it would be fixed in the tree. Simulation results show that, all multicasting trees building the proposed algorithm satisfy the power constraint, with slight increasing of the total cost.     

{雕刻时光}索尼DVD 602E

对于索尼602E而言，雕刻已经不仅仅是一种艺术，而是一种时尚、一股潮流。[编者按]     

抽水蓄能电站中水力干扰下的过渡过程及其稳定问题的研究

高水头抽水蓄能电站中，常采用一洞多机系统，所以机组之间水力联系紧密，本文建立了对水力干扰进行过渡过程计算所必须的既能进行大波动计算又可进入小波动的数学模型，并编制了计算程序，通过计算研究了部分机组停机过程中，其余机组在水力干扰下的过渡过程及稳定问题。     

实施双网覆盖提升移动数据业务品质

本文主要从运营角度,根据移动通信向数据业务方向发展的特点,结合几种通信技术设备对数据业务支持的差异性,从客户发展、建设成本、支持速度、未来升级等方面,利用理论数据和运营经验,通过对比,得出结论,数据专网＋（GSM或3G）双网覆盖,发挥各自长处,会大大提高移动数据业务的品质,促进信息化的大发展,进一步提高工作效率,改善人民生活质量。     

Ellipse-underlay protection algorithm to deal with regional demolishments in mesh optical networks

For the abundant bandwidth, a malfunction in optical networks causes a great deal of loss to traffic, and hence the survivability of optical networks must be considered. Two technologies, protection and restoration, are used in general, and the former is investigated in this paper. The existing protection strategies mainly cope with a single link failure or a double-link failure in an optical network and not consider what causes these failures. In this paper, we study the reasons which lead to the network malfunctions, and pose a new concept named regional demolishment. A protection algorithm named Ellipse-underlay algorithm is also proposed. We compare the performance of the Ellipse-underlay algorithm to the Node-disjoint algorithm. Simulation results show that the Ellipse-underlay algorithm is more effective to the survivability of traffic than the Node-disjoint algorithm.     

Mechanism of nitrogen-enhanced negative bias temperature instability in pMOSFET

From the detailed analysis of the dependence of threshold voltage shift and positive fixed charge/interface state generation on the stress time/temperature of negative bias temperature instability (NBTI) for various nitrogen concentrations at the oxide/Si interface, the mechanism of nitrogen-enhanced NBTI effect has been studied experimentally. The experimental results can be understood in terms of the reaction energies of the hydrogen trapping reactions at the interface, which are obtained from first-principles calculations. The calculations show that the nitrogen's lone-pair electrons can trap dissociated hydrogen species more easily than oxygen. From the experimental and theoretical studies, one can conclude that the roles of nitrogen in the NBTI are two folds, i.e., it provides more reaction sites, and it can also enhance the NBTI reaction by reducing the reaction energy.     

Analysis of singularities from modulus maxima of complex wavelets

Complex-valued wavelets are normally used to measure instantaneous frequencies, while real wavelets are normally used to detect singularities. We prove that the wavelet modulus maxima with a complex-valued wavelet can detect and characterize singularities. This is an extension of the previous wavelet work of Mallat and Hwang on modulus maxima using a real wavelet. With this extension, we can simultaneously detect instantaneous frequencies and singularities from the wavelet modulus maxima of a complex-valued wavelet. Some results of singularity detection with the modulus maxima from a real wavelet and an analytic complex-valued wavelet are compared. We also demonstrate that singularity detection methods can be employed to detect the corners of a planar object.     

基于序列关联的参差信号分选算法

针对复杂环境下常规直方图信号分选算法对于参差信号分选能力不佳的问题,该文提出一种基于脉冲间隔与单个脉冲关联的直方图算法.该算法根据脉冲间隔与单个脉冲的对应关系建立了脉冲间隔分布矩阵(PIDM),然后通过对PIDM行列的累加计算,得到一种新的直方图,该直方图可避免传统脉冲重复间隔(PRI)变换算法在分选参差信号时对于参差信号帧周期过多抑制的缺陷,且能够通过PIDM对辐射源脉冲串进行序列提取,进而得到参差子序列的周期值.仿真分析结果表明,在不增加计算复杂度的情况下,该算法对存在多部参差辐射源和固定重频辐射源的混合场景仍可保持良好的分选效果.     

Diagnosis knowledge representation and inference

In this article, we presented three graphical modeling techniques for diagnostic knowledge representation and inference: behavioral Petri nets (BPNs), multisignal flow graphs, and Bayesian networks (BNs). By using the same example from (Portinale, 1997) we showed that both multisignal flow graph model and BN model yield the same diagnosis. In addition, we showed that the P-invariant concept in BPN is similar to the D-separation concept in BNs.     

降尘剂兼具金属缓蚀作用的可行性研究

本文提出，将煤矿井下喷雾降尘使用的降尘剂，研制成为同时具有减缓金属腐蚀功能的产品；选用多聚磷酸盐进行试验的结果证明这是可行的。