摘要：指纹的唯一性和不变性使得它在各类生物识别系统中得到了广泛的应用。随着指纹识别技术的发展,大规模的指纹存储和系统高并发的需求给指纹识别系统带来了新的挑战。面对这种挑战,我们设计并实现了一个负载均衡的分布式指纹识别系统,它包括分布式指纹特征提取子系统和分布式指纹特征存储子系统两部分。在指纹特征提取的过程中,特征提取与Hadoop图片处理接口(HIPI)的结合使得特征提取的效率得到大幅度提升;特征存储子系统对MongoD B默认的负载均衡策略进行了优化,使得鲁棒性得到了明显提高。相关的试验和模拟表明,相比于Hadoop默认的小文件处理机制,我们的系统可以在指纹特征提取的过程中减少约70%的处理时间;优化后的MongoD B负载均衡策略可以将分布式MongoD B系统的前端mongos负载差距控制在5%以下,基于操作负载(增、删、改、查)的后端数据存储负载均衡策略将由数据迁移带来的时间开销降低了约40%。

摘要：The many-accelerator architecture, mostly composed of general-purpose cores and accelerator-like function units （FUs）, becomes a great alternative to homogeneous chip multiprocessors （CMPs） for its superior power-efficiency. However, the emerging many-accelerator processor shows a much more complicated memory accessing pattern than general purpose processors （GPPs） because the abundant on-chip FUs tend to generate highly-concurrent memory streams with distinct locality and bandwidth demand. The disordered memory streams issued by diverse accelerators exhibit a mutual- interference behavior and cannot be efficiently handled by the orthodox main memory interface that provides an inflexible data fetching mode. Unlike the traditional DRAM memory, our proposed Aggregation Memory System （AMS） can function adaptively to the characterized memory streams from different FUs, because it provides the FUs with different data fetching sizes and protects their locality in memory access by intelligently interleaving their data to memory devices through sub-rank binding. Moreover, AMS can batch the requests without sub-rank conflict into a read burst with our optimized memory scheduling policy. Experimental results from trace-based simulation show both conspicuous performance boost and energy saving brought by AMS.

摘要：Aerodynamic performance of low-Reynolds-number high-lift airfoil makes a great impact on designing a high-efficiency propeller for low-dynamic vehicles in stratosphere. At high altitude,low-Reynolds-number airfoils are supposed to have high lift-drag ratio or high endurance factor at cruising attack angle along with good stall characteristics. To design such a high-performance low-Reynolds-number high-lift airfoil,the paper established a hierarchical multi-objective optimization platform by combing direct search optimization algorithm EXTREM and airfoil flow field solver XFOIL to automatically and quickly calculate aerodynamic performance function of airfoil by computer. It provides an effective solution to multi-point design problem of low-speed low-Reynolds-number airfoil. It can be seen from the results of three typical optimization examples,the new airfoil E387_OPT2,FX63-137_OPT2 and S1223_OPT2 based on hot low-Reynolds-number high-lift airfoils (Eppler 387 airfoil,Wortmann FX63-137 airfoil and S1223 airfoil) can meet the optimization design requirements and have very good aerodynamic characteristics in both design state and non-design state. Thus,the applicability and effectiveness of hierarchical multi-objective optimization platform are verified.

摘要：Vehicular ad hoc networks(VANets) experiment system is ***,characteristics and research fields of VANets are introduced *** to the characteristics of VANets,key modules that multi-vehicle ad hoc experiment system needs are designed,and each module’s function and practice requirement is *** reliability of experiment system is tested primarily using three experiment scenes of multi-vehicle ad hoc network,car following and wireless *** experiment result shows that multi-vehicle ad hoc experiment system has the capability of the correlated experiment of VANets.

摘要：A kind of closed-loop Hall effect sensor is designed and fabricated by considering several factors such as iron core material,Hall device,as well as selected integrated *** studying the effect of the iron material and structures of current sensor,a kind of optimal Hall effect current sensor is *** experimental results show that the presented closed-loop Hall effect current sensor achieves 1 mA/A *** its linearity and accuracy are 0.1%and 0.35%FS,respectively,at currents ranging from 0 to 50 A.

摘要：锌卟啉更暗淡(1 ) 作为包含 N ligands 的一位新奇主人被设计了并且综合。它的主人客人建筑群的集会行为和 photophysical 变化被 1H NMR，荧光，和紫外可见的滴定评估，并且这些过程表明主人客人集会首先创造稳定的三明治建筑群，然后，轴的协作平衡出现在三明治之间复杂、免费的 ligand。汇编进程的吸收系列的变化依靠熄灭的建筑群，和荧光的稳定性取决于轴的协作平衡，它确实显示轴的 ligation/de-ligation 动力学是来自激动的状态的一条小径到为 metalloporphyrin 建筑群的扎根的状态。

摘要：在这份报纸，可变宇宙适应模糊控制器基于可变获得 H 管理者(VGHR ) 被设计稳定一只四倍的转换摆钟。VGHR 是一条新奇柔韧的安排获得的途径。由利用 VGHR 技术，一个更精确的即时反馈获得矩阵，随着状态正在变化，被获得。经由可变获得矩阵，四倍的转换摆钟的 10 个州的变量在采样时间被转变成一种合成错误(E) 和错误(EC ) 的变化的合成率。因此， multivariable 系统的尺寸被减少并且可变宇宙适应模糊控制器被造。实验说明建议控制计划的有效性。

摘要：Localization is one of the substantial issues in wireless sensor networks. The key problem for the mobile beacon localization is how to choose the appropriate beacon trajectory. However, little research has been done on it. In this paper, firstly, we deduce the number of positions for a beacon to send a packet according to the acreage of ROI (region of interest); and next we present a novel method based on virtual force to arrange the positions in arbitrary ROI; then we apply TSP (travelling salesman problem) algorithm to the positions sequence to obtain the optimal touring path, i.e. the reduced beacon trajectory. When a mobile beacon moves along the touring path, sending RF signals at every position, the sensors in ROI can work out their position with trilateration. Experimental results demonstrate that the localization method, based on the beacon reduced path, is efficient and has flexible accuracy.

摘要：In this paper an adaptive guidance law based on the characteristic model is designed to track a reference drag acceleration for reentry vehicles like the Shuttle. The characteristic modeling method of linear constant systems is extended for single-input and single-output （SlSO） linear time-varying systems so that the characteristic model can be established for reentry vehicles. A new nonlinear differential golden-section adaptive control law is presented. When the coefficients belong to a bounded closed convex set and their rate of change meets some constraints, the uniformly asymptotic stability of the nonlinear differential golden-section adaptive control system is proved. The tracking control law, the nonlinear differential golden-section control law, and the revised logical integral control law are integrated to design an adaptive guidance law based on the characteristic model. This guidance law overcomes the disadvantage of the feedback linearization method which needs the precise model. Simulation results show that the proposed method has better performance of tracking the reference drag acceleration than the feedback linearizaUon one.

摘要：OBJECTIVE:To compare the effects of carbamylβ-methylcholine chloride(CMCC) administered by intra-acupuncture point injection(IAI),intramuscular injection(IMI),and intravenous injection(IVI),and to analyze the ***:In the IAI group,CMCC was injected into the Zusanli acupoint(ST 36) immediately after 30-min stimulation by electro-acupuncture(EA) at the acupoints,and into the femoral vein and skeletal muscle in IVI and IMI groups,***-gastric pressure was *** plasma concentration of CMCC was measured at various ***:The gastric effect of CMCC in the IVI group was enhanced and attenuated more rapidly than in the other *** the IAI group,this effect was significantly stronger than that in the IMI group at 2 min and 15 min,but not significantly different between the two groups at 5 min and 30 *** concentration of CMCC in the IAI group was similar to that in the IVI group at 2 min,but higher than that in the IMI *** concentration in the IAI group was higher than that in the IV group and similar to that in the IMI group at 5,15 and 30 min,indicating rapid increase and slower reduction of the plasma concentration of the drug in the IAI *** was a positive correlation between the plasma concentration of CMCC and intragastric pressure in all ***:The effect of IAI with CMCC was stronger than that of IMI and longer-lasting than that of IVI,which correlated with the blood concentration of CMCC.