一种基于逆向通告的SIP Retargeting呼叫响应身份鉴别机制

会话初始协议(SIP)是以软交换为基础的下一代网络的核心信令控制协议,被广泛应用于基于IP的实时多媒体会话的控制与管理;Retargeting是SIP呼叫过程中普遍存在的一种路由模式。Retargeting呼叫模式下的响应身份问题是SIP安全研究领域的一个难点。该文首先阐述了该问题的产生机理,然后提出了一种基于逆向通告的响应身份鉴别机制,最后对其安全性能进行了概要分析。     

崩积物的热释光测年研究

以怀来八营槽为研究基础，分析研究了崩积物的沉积和岩相特征及其ＴＬ测年的适用性，并测定了样品的ＴＬ年龄，根据Ｔ年龄及其岩相部位，在该探槽内可划分出两次断层活动事件，事件Ｉ距今约２７ｋａ，事件Ⅱ距今约１５ｋａ。     

PL/I as a discrete event simulation tool

The programming language PL/I is considered as a most useful and portable discrete event simulation tool. This paper discusses design facilities required in simulation languages, making use of a model described in PL/I. The problem of queues, parallelism and synchronization in a simulator is solved. The structure of the simulator is considered.     

基于March C-算法的SRAM芯片的SEU失效测试系统

本文为实现SRAM芯片的单粒子翻转故障检测,基于LabVIEW和FPGA设计了一套存储器测试系统：故障监测端基于LabVIEW开发了可视化的测试平台,执行数据的采集、存储及结果分析任务;板卡测试端通过FPGA向参考SRAM和待测SRAM注入基于March C-算法的测试向量,通过NI公司的HSDIO-6548板卡采集两个SRAM的数据,根据其比较结果判定SEU故障是否发生。该系统可以实时监测故障状态及测试进程,并且具有较好的可扩展性。     

岩石单轴压缩破坏声发射特性试验研究

通过5种岩石试样的单轴压缩破坏全过程的声发射试验,研究了不同岩石受力变形的声发射特性,应力、应变与声发射的关系,应力、声发射与时间的关系。通过试验发现,岩石在单轴受压破坏全过程中都会产生声发射事件,声发射事件的特性与岩石的强度、质密程度、构造面的发育程度等有关;岩石在峰值破坏前的声发射事件数、应力、应变和时间之间的相互关系呈3种典型的类型;部分岩石试样在临近破坏前,其声发射事件率出现明显下降,这种岩石破坏的前兆现象可以用来解释岩体声发射现场监测时,在冒顶、片帮和岩爆等发生前会出现声发射事件反常现象,这对岩体工程稳定性监测预报、提高预报的准确性具有重要的指导作用和应用价值。     

Designing robust threshold gates against soft errors

In applications where issues like power efficiency, high performance, and more noise tolerance are important, asynchronous design methodology can play a significant role. However, as a result of technology shrinkage, combinational asynchronous circuits have become vulnerable in presence of particle strikes. In this paper, we design robust quasi-delay insensitive (QDI) asynchronous circuits against soft errors. Null Convention Logic (NCL) gates used as one of the basic techniques in asynchronous circuits, are redesigned to increase their robustness against Single Event Upset (SEU). We analyze our design for various NCL structures and compare them with another design in Kuang et al. (2007) [4], and show that our proposed approach is more robust against SEU. The effect of some parameters such as power consumption, delay, and the influence of transistor sizing on soft error tolerance are discussed.     

基于XML的粒子物理数据分析的接口及框架

介绍了一个基于可扩展标记语言(XML)的粒子物理数据分析接口及其框架的实现.该接口采用简明的XML表达数据分析中的基本过程:如事例筛选,运动学拟合,粒子鉴别等,以及基本逻辑流程:只有前一过程成功时才继续下一过程.该框架通过解析XML界面文件,采用运行时配置和动态执行的模式,从而无需编译即可执行分析.与使用C++编写分析...     

以城市事件为契机的旧工业区改造与再发展研究——以瑞典马尔默住宅展为例

主要研究以城市事件为契机的旧工业区改造对中小城市更新发展的作用机制。以瑞典马尔默住宅展为例,通过对住宅展的背景、选址、资金及主题研究,分析旧工业城市向知识信息型生态可持续城市转化的过程:以暂时性的城市事件为机遇,树立生态可持续的新型社区示范项目,逐步推动西港口地区改造及城市发展。最后讨论该住宅展对于中国中小城市改造可能的借鉴意义。     

Swarm intelligence driven design space exploration of optimal k-cycle transient fault secured datapath during high level synthesis based on user power–delay budget

Fault security indicates ability to provide error detection or fetch correct output. Fault security assures possibility of using either hardware redundancy or time redundancy to optimize the overheads associated with fault security. However, generation (design space exploration (DSE)) of an optimal fault secured datapath structure based on user power–delay budget during high level synthesis (HLS) in the context k-cycle transient fault is considered an intractable problem. This is due to the fact that for every type of candidate design solution produced during exploration, a feasible k-cycle fault secured datapath may not exist which satisfies the conflicting user constraints/budget. Secondly, insertion of inapt cut (resulting in an additional checkpoint) to optimize delay overhead associated with fault security in most cases may not result in optimal solutions in the context of user constraints/budgets. The solutions to the above problems have not been addressed in the literature so far. The paper therefore presents the following novelties: (a) an algorithm for fault secured DSE process (b) handling k-cycle transient faults during DSE (c) schemes for selecting appropriate edges for inserting cuts that selects available locations in the scheduled Control Data Flow Graph (CDFG) which minimizes delay overhead associated with fault security (d) swarm intelligence (particle swarm optimization) driven DSE process that adaptively/intelligently computes the candidate design solutions for generating an optimal fault secured datapath.Results of the proposed approach when tested on standard benchmarks yielded optimal results in most cases as evident from the data obtained for generational distance (GD), spacing (S), spreading (Δ) and weighted metric (W_m). Further, results of comparison with a recent approaches indicated significant reduction of final cost (better quality) for the proposed approach.     

蓝牙技术应用

文章着重分析蓝牙协议栈中HCI所起的作用及其使用环境,在此基础上详细介绍如何利用ROK 001 007蓝牙芯片,实现两台微机间数据通信的过程,并附有电路原理图.