Better is the Neighbor?

Abstract

This study applies the Sequential Panel Selection Method (SPSM), to investigate the convergence properties of the military expenditure of the North Atlantic Treaty Organization (NATO) during the period of 1990–2015. Compared to the traditional methods, SPSM considers fundamentally general spatial homogeneous and heterogeneous relationships with countries and examines the evolution of military expenditure. We find that four-fifths of NATO member countries have been convergent with the UK, but no country’s military expenditure is convergent with the US. This means that there is no significant linkage effect in the US for NATO military expenditure. While they are allies of the US, the majority of NATO member countries’ military expenditures are consistent with UK military expenditure. The main reasons are due to the geographical space layout and the international relationship convergence. The results indicate that more than four-fifths of NATO member countries have been coordinated with convergence theory and spillover effect.     

Do Military Expenditures Crowd-out Health Expenditures? Evidence from around the World, 2000–2013

Abstract

The paper examines the relationship between health and military expenditures using pooled cross-sectional (197 countries) and time series (2000–2013) data. Simultaneous equation models were employed to estimate the relationship between an array of public sector expenditures in order to address potential endogeneity. Our empirical findings strongly support the crowding-out hypothesis whereby increased military expenditures reduce the capacity of government to direct expenditures to health expenditures. These findings were robust to alternative specifications explored in the sensitivity analyses. Compared with upper-middle-income countries, the crowding-out effect became more pronounced among lower-middle-income countries. Consequently, this study shows that increased military expenditures negatively impacts health expenditures, and therefore poses as an important risk factor for population health and individual well-being. Moreover, it is the poorest of nations that are most sensitive to the negative effects of increased military expenditures.     

基于奇异值分解的潜艇磁场推算

针对潜艇磁性防护,基于磁偶极子阵列模型,建立了潜艇磁性目标高精度磁场计算模型。提出了利用奇异值分解的方法对模型进行求解,利用该求解算法进行了模型计算与实测数据比对,结果表明,该计算方法能够有效适用于计算高精度潜艇磁场。基于奇异分解的方法计算了潜艇高空磁场,计算结果可供潜艇防护磁性探测参考。     

一种用于GAF协议的优化邻居表算法

GAF协议是一种基于地理信息的无线传感器网络路由协议,由于采用多跳传输,将导致热区的产生。提出了一种优化邻居表算法,可以有效辨识GAF虚拟网格内的节点密度,从而选择密度大的网格通行,以均衡热区能耗,延长网络寿命。仿真结果验证了该算法的可行性。     

Steady-state analysis of load balancing with Coxian-2 distributed service times

This paper studies load balancing for many-server (N servers) systems. Each server has a buffer of size b ? 1, and can have at most one job in service and b ? 1 jobs in the buffer. The service time of a job follows the Coxian-2 distribution. We focus on steady-state performance of load balancing policies in the heavy traffic regime such that the normalized load of system is λ = 1 ? N^?α for 0 < α < 0.5. We identify a set of policies that achieve asymptotic zero waiting. The set of policies include several classical policies such as join-the-shortest-queue (JSQ), join-the-idle-queue (JIQ), idle-one-first (I1F) and power-of-d-choices (Po d) with d = O(N^α log N). The proof of the main result is based on Stein's method and state space collapse. A key technical contribution of this paper is the iterative state space collapse approach that leads to a simple generator approximation when applying Stein's method.     

南宋四川山地滨江防卫型城池营建研究——以重庆多功城为例

南宋抗蒙斗争时期,四川军民凭借严密的山地滨江网状防御体系成功地抵御了蒙军长达数十年的进攻。为分析、总结这一体系中山地滨江防卫型城池的营建特征,以其中一个重要城池——重庆多功城为代表,从历史沿革、选址、地形地貌、平面布局、周边道路、环境和主要建筑特征等方面进行分析,并结合相关史书资料和其他城池研究成果,总结出南宋四川山地滨江防卫型城池的营建特征:选址依山临水,择险而立;防御设施完善坚固;后勤保障得力。     

基于ANSYS的油罐拱顶稳定性分析

针对加肋拱顶稳定性十分复杂的问题,基于ANSYS建立了加肋拱顶油罐的三维有限元模型,对加肋拱顶的结构稳定性进行了数值模拟。对加肋拱顶在外压作用下的线性与非线性临界屈曲载荷进行了对比分析,利用弧长法获得了拱顶在加肋情况下径向、环向、轴向的载荷-位移曲线。结果表明:数值模拟的加肋拱顶屈曲方向和屈曲区域与实际失稳结果相一致,可以为加肋拱顶设计和稳定性分析提供一定参考。     

山水自在 筑鉴非凡——重庆商务职业学院新校区规划设计

介绍了重庆商务职业学院新校区的校园规划策略。基于生态保护进行校园规划,通过建筑布局与地形环境的协调共生形成山水校园,结合历史人文营造个性化校园空间。同时,从生态保护、规划分区、建筑布局、景观空间等方面探讨文化内涵与个性校园的规划设计策略,得出自然山水形成了丰富的地域景观,并由此创造出具有个性的地区文化的结论。旨在为山地校园建设起到借鉴作用。     

面向需求变化的军队自动化立体仓库货位优化

为提高军队自动化立体仓库的出库能力,提出应根据需求变化对在库物资货位进行动态调整,从而最大限度地保障军队物资需求。综合考虑堆垛机总行程、货物离散度和出库频率等评价指标,采用遗传算法对该多目标优化问题进行求解,并运用Matalab仿真。结果表明,该方法能较好地提高军队自动化立体仓库在需求动态变化时的出库能力。同时,该研究对一般仓库的货位优化也有一定的借鉴意义。     

管道机器人直线行进过程中多模式模糊PID控制

针对管道机器人PID控制直线行进过程中的跑偏问题,提出了一种改进的多模式模糊PID控制方法。通过建立集成直线行进偏差维度、阈值更新时间维度和初速度维度模式切换自适应阈值模型,减小了因模式切换造成的时间滞后误差。依托能力风暴AS-UⅢ机器人搭建实验测试平台,获取了不同初始速度下驱动轮的轨迹曲线。对比采用改进控制方法前后的轨迹曲线,验证了多模式模糊PID控制方法的有效性和实用性。