基于主动路由的无线mesh 网络区域移动管理方法

提出了一种无线mesh网络中基于主动路由的区域移动管理(active routing based intra-domain mobilitymanagement,简称ARMM)方法,将移动终端(mobile station,简称MS)的位置更新和mesh路由器(mesh route,简称MR)之间的动态路由相结合,让MR代替附着在它上面的MS进行位置管理,从而实现MR对MS的定位.给出了ARMM方法中的二层路由模型、路由算法及位置更新机制.性能分析结果表明,相对于现有的区域移动管理方法,ARMM方法具有较小的切换延时、位置更新开销和数据传输开销.     

面向二部图的极大缺陷二团高效枚举算法

极大二团枚举问题是二部图分析中的一个基本研究问题. 然而, 在实际应用中, 传统二团模型要求子图必须为完全二部图的约束往往过于严格, 因此需要一些更为宽松的二团模型作为代替. 为此, 提出一种新的称之为k-缺陷二团的松弛二团模型. 该模型允许二部图子图与完全子图二团最多相差k条边. 由于极大k-缺陷二团枚举问题属于NP-难问题, 设计高效的枚举算法是一项极具挑战性的任务. 为解决此问题, 提出一种基于对称集合枚举的算法. 该算法的思想是通过k-缺陷二团中缺失边的数量约束来控制子分支的数量. 为进一步提高计算效率, 还提出一系列优化技术, 包括基于排序的子图划分方法、基于上界的剪枝方法、基于线性时间的更新技术以及分支的优化方法. 此外, 提出的优化算法的时间复杂度与${mathrm{O}}(gamma _k^n) $有关, 其中${gamma _k} lt 2 $, 突破了传统${mathrm{O}}({2^n}) $的时间复杂度. 最后, 大量的实验结果表明, 在大部分参数条件下所提方法的效率相较于传统分支定界方法提高了100倍以上.     

一种基于两级缓存的协同缓存机制

信息中心网络(information-centric networking,简称ICN)将网络通信模式从当前的以地址为中心转变为以信息为中心.泛在化缓存是ICN重要特性之一,它通过赋予网络任意节点缓存的能力来缓和服务器的压力,降低用户访问延迟.然而,由于缺少内容热度的分布感知,现有ICN缓存策略仍存在缓存利用率较低、缓...     

Synthesis and characterization of the molecularly imprinted mesoporous silica based on the self-assembly technique for selective recognition of lomefloxacin in aqueous solution

Based on double-imprinting (surfactant and lomefloxacin templates) concept and self-assembly technique, a new molecularly imprinted mesoporous silica (MIP-MS) was prepared to understand and characterize the mechanism of fast binding and selective recognition of lomefloxacin (LOM) by the adsorption isotherms model, the adsorption kinetic models, and the competitive adsorption. The MIP-MS was prepared by using LOM and surfactant micelles as the templates formed through self-hydrolyzed, self-condensed, and co-condensation of tetraethoxysilane and methyltriethoxysilane in alkaline media, and with the covalently anchored organic groups in the mesoporous silica matrix. Both the molecularly imprinted polymer (MIP) and non-imprinted mesoporous polymer (NIP) were prepared for comparison. The surface area, pore size and pore volume of the MIP-MS are 270 m² g^?1, 4.42 nm and 0.28 cm³ g^?1, respectively. The kinetics studies showed that the pseudo-second-order model was consistent with the kinetic data of the MIP-MS with the fast binding templates (the 95 % uptake of LOM within 10 min). The equilibrium data, at various temperatures, were described successfully by the Langmuir and Freundlich isotherm models. The Freundlich model was found to fit the experiment data well. The thermodynamics parameters (positive values of ΔS, negative values of ΔH and ΔG) indicated that the binding system for the MIP-MS was entropy-gained, exothermic, and the spontaneous adsorptive forces were stronger on MIP-MS than on NIP and MIP. The MIP-MS showed fast binding, higher affinity, and selectivity for the template of LOM compared with the NIP and MIP.     

Fuel-cell sharing for a distributed hybrid power system

This paper investigates the benefits of sharing a proton exchange membrane fuel cell (PEMFC) in a distributed hybrid power system. The PEMFC is usually used as backup power in stationary hybrid power systems; however, in that scenario, it might be working only 2% of the time while incurring 20% of the system expenses. Therefore, this paper examines the potential of sharing a PEMFC among multiple power systems. We develop a distributed hybrid power system that comprises several immovable power stations and a fuel-cell vehicle (FCV). Each power station is equipped with solar panels and batteries, while the FCV contains a PEMFC module and can move among the stations to provide sustainable power as needed. We propose power management strategies and show that the total system costs can be significantly reduced by 10.83% and 17.89% when sharing one FCV between three and twelve power stations, respectively. We also design experiments to demonstrate the feasibility of the proposed distributed hybrid power system. In the future, the developed model can be extended to provide further cost reductions by optimizing distributed hybrid power systems with multiple FCVs.     

某金银矿石浮选—氰化联合流程选矿试验

某金银矿石含金4.80 g/t,含银565 g/t,金矿物主要为自然金,呈独立矿物形式存在,部分以显微或次显微状赋存于褐铁矿及石英中,裸露金占总金的72.29%,铁矿物和硅酸盐矿物包裹金分别占总金的22.08%和5.63%;银矿物主要以辉银矿形式存在,嵌布粒度较粗,硫化银占总银的91.33%,自然银和氯化银含量较低,分别仅占总银的6.55%和2.12%。为实现该金银矿的高效开发利用,进行了选矿试验。结果表明：矿石在磨矿细度为-0.074 mm占74.5%的情况下,采用1粗4精2扫、精选1尾矿精扫选后再返回的浮选流程处理,可获得金品位为77.19 g/t、银品位为11 302 g/t,金、银回收率分别为75.58%和94.02%的精矿;金、银品位分别为1.23 g/t和35.45 g/t的浮选尾矿在再磨细度为-0.043 mm占86%的情况下氰化浸出,浸渣金、银品位分别为0.10 g/t和17.88 g/t,金、银对浮选尾矿的浸出率分别为91.87%和49.56%,全流程金、银总回收率分别达98.01%和96.98%。     

Vibration behavior of light metals: Al–Zn alloy and Mg–Al–Zn alloy

Both Al–Zn alloy and Mg–Al–Zn alloy are considered as high damping and light materials. This study investigated the effects of the structure and the composition on the vibration fracture characteristics of the Al–xZn alloy and the Mg–xAl–Zn alloy under resonance. For Al–xZn (x = 7, 11, 49, and 83 wt.%) alloys, under both constant force and initial-deflection conditions, the 7Zn specimen showed the greatest vibration life. For Mg–xAl–Zn (x = 3, 6, and 9 wt.%) alloys, experimental results indicate that the AZ31-F as-extruded samples showed a greater vibration life, while high Al fully annealed samples (AZ91-O) had greater vibration fracture resistance under constant force conditions.     

Research evaluation of research-oriented universities in Taiwan from 1993 to 2003

Publications have been regarded as the most significant output indicating the research performance of universities. This paper uses ISI Essential Science Indicators (ESI) database to investigate the academic performance of research-oriented universities in Taiwan, adopting the bibliometric method from both quantitative and qualitative perspectives. The data cover the time span for 11 years from 1993 to 2003. The performance indicators applied in this study includes the number of papers, the number of citations, the average citations per paper, the number of highly cited papers, the number of hot papers, and the number of top papers. The research performance and the strength of those universities are revealed in this study, and it is found that National Taiwan University leads among these universities though each university still shows strengths in various specific fields.     

Active Routing Based Intra-Domain Mobility Management for Wireless Mesh Networks

提出了一种无线mesh网络中基于主动路由的区域移动管理(active routing based intra-domain mobility management,简称ARMM)方法,将移动终端(mobile station,简称MS)的位置更新和mesh路由器(mesh route,简称MR)之间的动态路由相结合,让MR代替附着在它上面的MS进行位置管理,从而实现MR对MS的定位.给出了ARMM方法中的二层路由模型、路由算法及位置更新机制.性能分析结果表明,相对于现有的区域移动管理方法,ARMM方法具有较小的切换延时、位置更新开销和数据传输开销.     

Bibliometric characteristics of highly cited papers from Taiwan, 2000–2009

The present study analyzes bibliometric characteristics of Taiwan??s highly cited papers published from 2000 to 2009. During this period, Taiwan ranked within the top 30 countries by number of highly cited papers, defined in Thomson Reuters?? Essential Science Indicators (ESI) as those that rank in the top 1?% by citations for their category and year of publication. Taiwan made notable progress in world-class research in the two consecutive 5-year periods 2000?C2004 and 2005?C2009. For the group of highly cited papers from Taiwan, USA, China, Germany, and Japan were the top collaborating countries over the decade. In recent years, Taiwan has increasingly collaborated with European countries whose output of highly cited papers is relatively high and increasing, rather than with its neighboring countries in Asia. Overall, Taiwan produced highly cited papers in all the 22 ESI subject categories during the 10-year period. Taiwan??s output of highly cited papers was greatest in the categories of Engineering, Clinical Medicine, and Physics, while those in Agricultural Sciences and Mathematics exceeded the expected output level in relative terms. More detailed analyses would be useful for a holistic understanding of Taiwan??s research landscape and their progress in world-class research, combining both bibliometric and non-bibliometric data, such as researcher mobility, research grants, and output from internationally-collaborated research programs.