A new scheduling algorithm to provide proportional QoS in optical burst switching networks

A new scheduling algorithm, which aims to provide proportional and controllable QoS （Quality of Service） in terms of burst loss probability for OBS （Optical Burst Switching） networks, is proposed on the basis of a survey of QoS schemes in current OBS networks. With simulations, performance analysis and comparisons are carried out in detail. The results show that, in the proposed scheme, burst loss probabilities are proportional to the given factors and the control of QoS performance can be achieved with better performance. This scheme will be beneficial to the OBS network management and the tariffpolicy making.     

延迟容忍移动传感器网络中基于社会网络的数据传输策略

延迟容忍移动传感器网络(DTMSN)是一种广泛应用的数据采集网络.提出一种基于社会网络的数据传输策略SNBD(social network-based data delivery scheme)应用于DTMSN.SNBD引入社会网络中的相互作用强度和相称机制,通过计算两传感器节点之间的相互作用强度值和相称值,作为消息传输时选择下一跳的依据.为了优化节点队列,SNBD采用消息的重要因子和TTL决定队列中消息传递的优先顺序和丢弃原则.模拟实验表明,与现有的几种数据传输策略相比,SNBD不但具有较高的数据传输成功率,而且具有较低的数据传输能耗和传输延迟,并且通过分析发现SNBD的网络寿命是SRAD和FAD的8倍.     

基于耕地“力业相称”的城镇与农村居民点减少用地的挂钩分析

本文根据我国历史上耕地面积和人口数量,得到传统耕作方式下农业“力业相称”时每个农村劳动力的最大耕种面积。以此数据为基点,推算了在复种指数为1、复种指数为1.26、复种指数1.26和最小规模化经营3种情况下,2008年、2020年、2030年耕地能够承载的最小劳动力,需要转入城市的人口数量。按照城镇规划的标准,计算出了我国城镇建设占用的总面积,城镇还需占用的土地面积。转入城镇的农村人口留下的农村居民点经过复垦整理增加的耕地面积和建设用地占用耕地面积相挂钩,最后得出我国耕地保有量的面积。     

On Submanifolds in Locally Symmetric and Conformally Flat Riemannian Manifolds

Let N^n p be an (n p)-dimensional locally symmetric and conformally flat Riemannian manifold and M^n be an n-dimenslonal compact submanifold minimally immersed in N^n p. Instead of (n p)-dimensional unit sphere, we generalize Pinching Theorems about submanifolds in unit sphere and get theorems about submanifolds in locally symmetric and conformally flat Riemannian manifold.     

使用分级方案应用研究堆应急准备与响应要求研究

我国当前的研究堆应急管理没有对不同类别研究堆的应急准备与响应作出差异性要求,分级方案是根据与反应堆相关的潜在危害正当应用这些安全要求的良好手段。按照分级方案的步骤,基于我国当前研究堆安全分类准则、国际原子能机构（IAEA）功率相关应急威胁分类准则以及应用IAEA应急准备与响应要求的分级方案的依据,提出了我国研究堆的应急管理分类准则以及对不同应急管理类别研究堆应急状态分级和应急计划区（EPZ）要求,这为简化低功率研究堆营运单位应急预案的内容和细节的范围、程度和水平以及建立与不同类别研究堆危害评定结果相称的我国研究堆应急管理系统提供了依据。      

The identification algorithm time-invariant for commensurate order linear fractional systems

An efficient identification algorithm is given for commensurate order linear time - invariant fractional systems. This algorithm can identify not only model coefficients of the system, but also its differential order at the same time. The basic idea is to change the system matrix into a diagonal one through basis transformation. This makes it possible to turn the system＇ s input-output relationships into the summation of several simple subsystems, and after the identification of these subsystems, the whole identification system is obtained which is algebraically equivalent to the former system. Finally an identification example verifies the effectiveness of the method previously mentioned.