关于张家口住宅开发市场的思考

合理的户型设计将成为未来住宅市场上的核心竞争力．通过分析当前张家口住宅产业发展现状和市场需求,提出了进行中小套型住宅的开发策略．     

Expected role of nuclear science and technology to support the sustainable supply of energy in Indonesia

Energy resources are available in Indonesia but small per capita. The increase of oil price and its reserve depletion rate dictates to decrease the oil consumption. Therefore, it is imperative to increase the shares of other fossils as well as the new and renewable sources of energy in various energy sectors substituting the oil. The introduction of nuclear power plant becomes more indispensable, although the share is to be small but significantly important for electric generation in Java–Madura–Bali grid. Nuclear technology can have also important role enabling the increase of the shares of renewable, e.g. geothermal, hydro and bio-fuels as well as fossil energies to meet more sustainable energy mix sufficing the energy demand to attain intended economic and population growths while maintaining the environment. The first introduced nuclear power plant is to be the proven ones, but the innovative nuclear energy systems being developed by various countries will eventually also be partially employed to further improve the sustainability. The nuclear science and technology are to be symbiotic and synergistic to other sources of energy to enhance the sustainable supply of energy.     

基于蒙特卡罗方法的复合材料辐射屏蔽设计北大核心CSCD

在乏燃料后处理厂的工作环境中可能存在着低能中子-γ射线混合辐射,严重威胁工作人员的人身安全。本文针对上述混合辐射环境,利用蒙特卡罗程序Geant4模拟计算了一种钨/硼纤维增强含硼/铋聚合物复合材料中不同材料参数对低能中子和γ射线综合防护效果的影响。结果显示,此种钨/硼纤维复合材料对低能中子和γ射线均具有良好的屏蔽效果。文章证实了纤维垂直排布方式具有比平行排布方式更优的屏蔽效果,且垂直排布方式下透过粒子束的强度分布更加均匀。此外,在聚合物基体中掺杂一定质量分数的硼/铋可以进一步增强复合材料的辐射屏蔽效果。依据这些结果我们认为此种复合材料可以为后处理厂等辐射环境中的防护服及相关防护用具提供参考。     

Procedural Synthesis using Vortex Particle Method for Fluid Simulation

We propose a fast and effective technique to improve sub‐grid visual details of the grid based fluid simulation. Our method procedurally synthesizes the flow fields coming from the incompressible Navier‐Stokes solver and the vorticity fields generated by vortex particle method for sub‐grid turbulence. We are able to efficiently animate smoke which is highly turbulent and swirling with small scale details. Since this technique does not solve the linear system in high‐resolution grids, it can perform fluid simulation more rapidly. We can easily estimate the influence of turbulent and swirling effect to the fluid flow.     

一维驱动二维跟踪太阳自动跟踪系统设计

本文从对太阳方位变化规律的分析计算入手,利用天文时间来提供准确可靠的自动跟踪信号,并采用一维驱动实现二维精密跟踪的新技术。依此所设计的新型太阳能聚光器自动跟踪系统与同类产品相比,具有准确可靠、抗干扰能力强、成本低、方便实用等特点;这对于通过聚光方式推动太阳能应用具有重大的现实意义。     

基于用户回答顺序的社区问答答案质量预测研究

近年来,随着互联网的普及和知识爆炸性的增长,社区问答网站积累了大量的用户和内容,同时也产生了大量的低质量文本,极大地影响了用户检索满意答案的效率,因此如何提升答案质量预测的性能十分重要。目前,社区问答答案质量预测方面的研究大都是使用点方式(pointwise)来实现分类模型,但由于问题的难度不同,对答案的要求也有所差异,使用点方式会忽略掉部分答案的特点,所以该文使用点对方式(pairwise)来预测答案质量。另外,已有的研究工作表明,社区问答中同一问题下的答案数量特征对答案质量预测没有效果,甚至有冗余作用。对于时间差也有相同的结论,即不能提升预测性能。该文提出了一种将上述两者结合在一起的新特征,实验结果表明,该特征能显著提高社区问答答案质量预测的性能。     

一种RBF网络结构调整的稳健增量学习方法

以实现RBF网络的增量学习能力和提高其增量学习的稳健性为目的,给出了一种RBF网络增量学习算法.算法首先对初始数据集进行聚类得到初始的RBF网络结构,然后采用GAP-RBF算法中的隐层节点调整策略动态调整网络结构实现RBF网络增量学习.RBF网络的初始化降低了初始数据集样本训练顺序对RBF网络性能的影响,增强了其增量学习的稳健性.IRIS数据集和雷达实测数据集仿真实验表明,算法具有较好的增量学习能力.     

Fat-tree routing and node ordering providing contention free traffic for MPI global collectives

As the size of High Performance Computing clusters grows, so does the probability of interconnect hot spots that degrade the latency and effective bandwidth the network provides. This paper presents a solution to this scalability problem for real life constant bisectional-bandwidth fat-tree topologies. It is shown that maximal bandwidth and cut-through latency can be achieved for MPI global collective traffic. To form such a congestion-free configuration, MPI programs should utilize collective communication, MPI-node-order should be topology aware, and the packet routing should match the MPI communication patterns. First, we show that MPI collectives can be classified into unidirectional and bidirectional shifts. Using this property, we propose a scheme for congestion-free routing of the global collectives in fully and partially populated fat trees running a single job. The no-contention result is then obtained for multiple jobs running on the same fat-tree by applying some job size and placement restrictions. Simulation results of the proposed routing, MPI-node-order and communication patterns show no contention which provides a 40% throughput improvement over previously published results for all-to-all collectives.     

动态核的形态分解联想算法及抗随机噪声研究

在灰度图像分解算法和动态核形态联想记忆网络的基础上,提出了一种新的联想记忆算法--动态核的形态分解联想算法.该方法显著地提高了联想记忆抗随机噪声的能力,较好地解决了灰度图像在含噪时的联想记忆和识别的问题,从而给出了一种恢复含噪灰度图像的途径,并把该方法推广到了彩色图像的处理.通过实验,验证了该方法的良好性能,取得了理想的结果.     

第三方软件项目咨询的作用与实践

通过对中小软件企业在项目过程中存在的问题分析,提出了引入第三方软件项目咨询的解决方案。以具体软件项目咨询实践为例,结合软件工程与项目管理方法论,论述了软件项目咨询为提高中小软件企业的项目实效所发挥的作用。