基于Handle-c的内部进化DES密码系统设计

DES算法作为全世界使用最广泛的分组密码算法,本文分析DES算法本身以及其硬件实现过程进行分析,利用Handle-C语言编程实现其内部进化电路,最终在xinlinx在Virtex-E系列FPGA上成功实现。实验结果表明,该DES密码系统占用硬件资源少,速度快,能对弱密钥、半弱密钥进行自组织、自修复,提高了DES算法的安全性、灵活性。

基于NILE算法量化热水器参与需求响应的灵活性

居民电热水器(EWH)因其功耗与日负荷模式高度相关且占家庭负荷比重高等特点,在需求响应(DR)市场中极具潜力。识别住宅侧EWH集群的负荷模式及量化其参与DR的灵活性有助于电网运营商制定合理的调控策略。首先,对居民EWH不同时间类型下的负荷模式(用电事件的起止时间和用电时长)建立了概率统计模型。然后,提出了一种基于负荷印记和功率块极值的无训练过程的非侵入式负荷提取(NILE)算法,其可自动分离不同额定功率的EWH负荷。最后,建立了电价激励的DR模型以优化EWH的负荷模式,根据其在优化前后使用行为的变化情况量化其灵活性。此外,在真实数据集上验证了所提算法的有效性,并基于分离的负荷数据在不同情况下量化了EWH集群参与DR的灵活性。

电热水器最佳功率多目标遗传算法优化控制

为了提高电热水器(EWH)的使用效率,从智能用电控制技术角度考虑,对电价改变、外部温度以及用户的用水习惯进行了综合分析,构建了可以同时满足用电成本与舒适度要求的EWH优化策略。优化结果表明:在α取值为11/12时,电费降低了5%,而热不适只小幅增大2%。采用多目标优化控制模式能够获得最优EWH曲线,从而更好地完成需求响应。用户对EWH采取预加热或实时控温的方式,会提高系统的晚高峰用电负荷。为提升用户的舒适度,按照峰谷分时电价完成电价响应,通过发挥EWH储热作用,使负荷群获得的聚合功率保持到早晨。早晨时段属于低谷用电阶段,可以达到削峰填谷效果。该研究对智能家装的效率提高具有很好的实际指导意义。

Analysis of Effective Working Hours of Automatic Assembly Equipment for Aircraft Assembly Stations

To improve the accuracy of capacity analysis and prediction for the aircraft assembly stations,an approach for calculating the effective working hour(EWH)of automatic assembly equipment is introduced by using the dynamic mixed Weibull distribution(DMWD)model.Firstly,according to the features of aircraft assembling,a DMWD model considering the dynamic reliability of multiple subsystems and their synthetic effects on the whole equipment is established.A typical automatic drilling&riveting machine is selected as the research object,and the dynamic weights of reliability of three subsystems are modeled and solved.Subsequently the unknown parameters of the DMWD model are estimated based on maximum likelihood estimation(MLE)and Newton-Raphson method.Finally,the EWH of an automatic station is defined and modeled by using the solved dynamic reliability function.Based on the experimental study on a real automatic drilling&riveting machine from a wing panel assembly station,it is shown that the proposed DMWD and EWH models could effectively calculate the equipment reliability with full consideration of its multiple subsystems.The DMWD model is more suitable for improving the solution precision of EWH than the traditional three-parameter Weibull distribution.

信号、电路实验教学的改革与探索

本文对信号、电路实验教学的改革进行了探索。在分析了传统的实验方式之不足与EDA教学的特点之后 ,作者认为 ,为培养有用人才 ,必须把传统硬件实验与EDA实验有机的结合起来 。

Monthly gravity field recovery from GRACE orbits and K-band measurements using variational equations approach

The Gravity Recovery and Climate Experiment（GRACE） mission can significantly improve our knowledge of the temporal variability of the Earth＇s gravity field.We obtained monthly gravity field solutions based on variational equations approach from GPS-derived positions of GRACE satellites and K-band range-rate measurements.The impact of different fixed data weighting ratios in temporal gravity field recovery while combining the two types of data was investigated for the purpose of deriving the best combined solution.The monthly gravity field solution obtained through above procedures was named as the Institute of Geodesy and Geophysics（IGG） temporal gravity field models.IGG temporal gravity field models were compared with GRACE Release05（RL05） products in following aspects：（i） the trend of the mass anomaly in China and its nearby regions within 2005-2010; （ii） the root mean squares of the global mass anomaly during 2005-2010; （iii） time-series changes in the mean water storage in the region of the Amazon Basin and the Sahara Desert between 2005 and 2010.The results showed that IGG solutions were almost consistent with GRACE RL05 products in above aspects（i）-（iii）.Changes in the annual amplitude of mean water storage in the Amazon Basin were 14.7 ± 1.2 cm for IGG,17.1 ± 1.3 cm for the Centre for Space Research（CSR）,16.4 ± 0.9 cm for the GeoForschungsZentrum（GFZ） and 16.9 ± 1.2 cm for the Jet Propulsion Laboratory（JPL） in terms of equivalent water height（EWH）,respectively.The root mean squares of the mean mass anomaly in Sahara were 1.2 cm,0.9 cm,0.9 cm and 1.2 cm for temporal gravity field models of IGG,CSR,GFZ and JPL,respectively.Comparison suggested that IGG temporal gravity field solutions were at the same accuracy level with the latest temporal gravity field solutions published by CSR,GFZ and JPL.

子宫下段注射垂体后叶素治疗前置胎盘出血65例临床分析

目的：探讨子宫下段注射垂体后叶素治疗前置胎盘出血的临床疗效。方法对妊娠36～40＋周前置胎盘剖宫产的孕妇，随机分成试验组和对照组，试验组：胎盘娩出后以垂体后叶素6 U加生理盐水9 mL，于子宫下段胎盘剥离处肌层分多点注射，每点1～2 mL；如再出血可继续注射至无出血，最大剂量不超过12 U：其余处理方法同对照组；对照组：常规处理（宫肌注缩宫素、欣母沛，压迫、按摩子宫、出血处8字缝扎或补丁式缝合止血）。结果两组产妇在手术止血时间[（4±1.4）∶（24±2.5）min]、产后出血量[（884±401）∶（1902±827） mL的比较，差异有统计学意义（P〈0.05），而在手术时间方面两组比较则差异无统计学意义。结论子宫下段注射垂体后叶素治疗前置胎盘出血疗效确切，止血迅速，安全可靠，可明显减少产后出血量。

基于误差加权哈希的图像检索方法

图像检索技术旨在大规模图像库中准确、快速地检索与查询图像相似的图像。基于此,对误差加权哈希Error Weighted Hashing(EWH)快速近似最近邻搜索算法进行分析,并将其与Locality Sensitive Hashing(LSH)局部敏感哈希、Multi-Index Hashing(MIH)多索引哈希进行分析比较,然后基于误差加权哈希(EWH)算法构建图像检索系统,设计分段哈希索引的结构以及该系统所需要实现的功能模块。

基于卫星重力时变重力场的陆地水储量变化研究

利用卫星重力技术监测全球陆地水储量变化(TWSC)兼具重要的实用价值和科学研究意义。基于GRACE(Gravity recovery and climate experiment)时变重力场模型研究了2002—2020年全球部分流域水储量变化,并探讨了气候和人为因素对区域水储量变化的影响。研究结果显示:地理区域相近流域的水储量时间序列具有相似的周期和振幅,而位于南北半球的临近流域水储量变化则呈现了相反的周期信号;墨累-达令流域内的水储量受到降水和蒸发共同影响,而印度河-恒河流域由于过度抽取地下水造成流域水储量不断下降;亚马逊流域内的GARCE和GLDAS (Global land data assimilation systems)反演水储量变化的相关性达到0.86,同时发现GRACE在探测区域干旱事件方面有独特的优势。

一线多路模块供电系统在夏利轿车上的应用

介绍一种利用编码和解码技术的一线多路供电模块系统在夏利轿车上的应用 ,该系统简化了汽车ECU与车用电器设备之间的信号传输 。

Optimization Method for Electrical Water Heaters Considering Shifting Potentials of Electricity Consumption and Water-use Activities

Electrical water heaters(EWHs)are important can-didates to provide demand-response services.The traditional optimization method for EWHs focuses on the optimization of the electricity consumption,without considering the shifting potential of the wateruse activities.This paper proposes an optimization method for EWHs considering the shifting potentials of both the electricity consumption and wateruse activities.Con-sidering that the wateruse activities could be monolithically shifted,the shifting model of the water-use activities was developed.In addition to the thermodynamic model of the EWH,the optimal scheduling model of the EWH was developed and solved using mixed-integer linear programming.Case studies were performed on a single EWH and aggregate EWHs,demon-strating that the proposed method can shift the water-use activities and therefore increase the load-shifting potential of the EWHs.

基于云模型理论的家用电热水器优化控制策略

针对居民用户家用电热水器(electric water heater,EWH)电能消耗较大的问题,提出一种基于云模型理论的家用电热水器优化控制策略。该控制策略以电热水器水箱内的实时水温和电网下发至居民用户的电价作为云模型发生器的前件,电热水器的实时功率档位值作为云模型发生器的后件,建立以居民用户家用电热水器用电花费最少为优化目标的控制策略。同时,经过云模型控制器对电热水器的用户参数调整,实现了将居民用户早晚用电高峰转移至其他用电低谷时期的良好效果。仿真结果表明,在满足居民用户基本用水温度需求的前提下,该方法能够有效降低电力公司高电价时间段的用电消耗,从而保证了电网的稳定性。最后,还针对云模型内部参数不同的优化效果进行了对比。

Accommodation of curtailed wind power by electric water heaters based on a new hybrid prediction approach

Wind power curtailment is of great importance with the increase of large-scale wind power connected to the grid. A new concept of redundant wind power accommodated by dispatching electric water heaters(EWHs) is developed in the paper. Precise predictions of wind power and EWHs load power are the basis for this work. A hybrid multi-kernel prediction approach integrating an adaptive fruit fly optimization algorithm(AFOA)and multi-kernel relevance vector machine(MKRVM) is proposed to deal with the sample distribution of multisource heterogeneous features uncovered by an energy entropy method, where AFOA is used to determine the kernel parameters in MKRVM adaptively and avoid the arbitrariness. For the large computation of the prediction approach, parallel computation based on the Hadoop cluster is used to accelerate the calculation. Then, an economic dispatching model for accommodating wind power is built taking into account the penalty of curtailed wind power and the operation cost of EWHs. The proposedscheme is implemented in an intelligent residential district.The results show that the optimization performance of the hybrid prediction approach is superior to those of four usual optimization algorithms in this case. Regular or orderly scheduling of EWHs enables accommodation of superfluous wind power and reduces dispatch cost.