摘要：The influence of the period of rotation on the effectiveness of the thermophotovoltaic （TPV） rotary regenerator was theoretically and experimentally investi- gated. It was found that the deviations of the theoretical results from the experimental ones decrease with the increase of the period of rotation. To the TPV system of 10 kW combustion power, the deviation is 3.5% when the rotation period is 3 s; while the deviation decreases to 1.5% when the rotation period increases to 15 s. The deviation could be mainly attributed to the cold and hot fluids carryover loss which was not considered in the model. With a new model taking account of the carryover loss established, the predicted results were greatly improved. Based on the modified model, the influence of geometrical parameters of rotary regenerator on the effectiveness was analyzed for TPV systems of various combustion power. The results demonstrate that the effectiveness increases with the increase of the rotary regenerator diameter and height, while fluid carryover loss increases at the same time, which weakens the impact of geometrical parameters.

摘要：针对合成孔径雷达(SAR)目标识别,提出一种联合非线性相关信息熵(NCIE)和多分辨表示的方法。采用NCIE对原始SAR图像的多分辨率表示进行选择,获得内在相关较强的若干分辨率。然后,采用联合稀疏表示对选取的多分辨率样本进行联合表征和分类。实验中,以MSTAR数据集为基础设计多种操作条件对不同方法进行测试,结果表明了所提方法的有效性。

摘要：该文研究了岩沥青改性沥青混合料的耐久性及抗裂性能,并探讨其在凤凰大桥工程中的应用。通过详细介绍岩沥青的物理化学性质和改性机理,分析了其对沥青混合料性能的影响。针对凤凰大桥的设计需求,优化了材料选择与配合比设计,并通过室内外性能测试评估了高温稳定性、低温抗裂性、水稳定性及疲劳性能。实际应用表明,岩沥青改性沥青混合料在凤凰大桥中表现出优异的耐久性和抗裂性能。

摘要：云计算环境下的大数据特征挖掘是大数据统计及分析的基础。为了提高聚类的准确度和速度,设计了一种基于分布式Hadoop平台和熵加权特征选择的数据挖掘方案。该方案首先采用无回路有向图对Hadoop平台下的Map Reduce作业流调度问题进行了分析。然后采用并行Map Reduce执行过程完成分布式计算。最后,采用熵加权聚类算法实现海量数据挖掘。仿真结果显示,提出的数据挖掘方案具有较好聚类效果和运行效率。

摘要：In view of the problem that the current single-antenna GPS attitude determination system can only determine the body attitude when the sideslip angle is zero and the multiantenna GPS/SINS integrated navigation system is of large volume, high cost, and complex structure, this approach is presented to determine the attitude based on vector space with single-antenna GPS and accelerometers in the micro inertial measurement unit （MIMU）. It can provide real-time and accurate attitude information. Subsequently, the single-antenna GPS/SINS integrated navigation system is designed based on the combination of position, velocity, and attitude. Finally the semi- physical simulations of single-antenna GPS attitude determination system and single-antenna GPS/SINS integrated navigation system are carried out. The simulation results, based on measured data, show that the single-antenna GPS/SINS system can provide more accurate navigation information compared to the GPS/SINS system, based on the combination of position and velocity. Furthermore, the single-antenna GPS/SINS system is characteristic of lower cost and simpler structure. It provides the basis for the application of a single-antenna GPS/SINS integrated navigation system in a micro aerial vehicle （MAV）.

摘要：尺寸精度是影响熔融沉积成型方法应用的重要因素。因此,需要进行熔融沉积成型尺寸偏差预测。以填充率、打印速度、层高及打印温度为研究对象,提出了一种基于工艺参数的尺寸偏差建模方法。基于极差思想研究了各工艺参数对尺寸精度的影响权重,结果表明,打印温度、填充率、层高及打印速度对尺寸精度的影响权重分别为33.17%、28.04%、26.04%及12.74%。设计了训练样本及验证样本分别用作模型学习及验证。结果表明,研究案例中,3个尺寸对象的模型预测及实测值的平均绝对偏差分别为0.3129、0.2970及0.4360;模型预测及实测差值集的标准差分别为0.1885、0.2004及0.2549。该方法能有效地预测熔融沉积成型零件的尺寸偏差。

摘要：Biological inspiration has spawned a wealth of solutions to both mechanical design and control schemes in the efforts to develop agile legged machines. This paper presents a compliant leg mechanism for a small six-legged robot, HITCR-ll, based on abstracted anatomy from insect legs. Kinematic structure, relative proportion of leg segment lengths and actuation system were analyzed in consideration of anatomical structure as well as muscle system of insect legs and desired mobility. A spring based passive compliance mechanism inspired by musculoskeletal structures of biological systems was integrated into distal segment of the leg to soften foot impact on touchdown. In addition, an efficient locomotion planner capable of generating natural movements for the legs during swing phase was proposed. The problem of leg swing was formulated as an optimal control procedure that satisfies a series of locomotion task terms while minimizing a biologically-based objective function, which was solved by a Gauss Pseudospectral Method （GPM） based numerical technique. We applied this swing generation algorithm to both a simulation platform and a robot prototype. Results show that the proposed leg structure and swing planner are able to successfully perform effective swing movements on rugged terrains.

摘要：高光谱图像变化检测通过分析同一区域不同时间拍摄的高光谱图像,识别自然场景中地物变化。现有基于深度学习的检测方法主要包括卷积神经网络和基于注意力的方法两类:卷积神经网络方法使用卷积核提取特征,但感受野较小,关注局部信息,缺乏全局建模能力;而基于注意力的方法专注于全局依赖性建模,但对局部特征的捕捉不足,导致检测中漏检、误检现象严重。针对这些不足,提出了一种联合多尺度高低频信息融合的变化检测方法。具体而言,通过金字塔多尺度网络提取多时相高光谱图像的高低频信息,不同尺度的高频信息关注边界区域,低频信息捕捉背景区域细节。高频信息通过残差卷积算子网络提取多尺度局部特征;低频信息通过基于自注意力的网络提取全局特征,以此对图像全局和局部信息进行有效建模。为进一步增强特征提取的有效性,设计了双时相差分分类决策网络,自适应学习各分支的分类权重系数,生成最终的加权预测结果。在三个真实高光谱数据集上的实验表明,方法在可视化和定量性能上均优于现有方法,实现了更高的分类精度和更稳定的变化检测效果。

摘要：The letter proposes a three-layer manageable media distribution network system architecture called MSPnet, which is based on Session Initiation ProtocolIll and Peer to Peer （SIP P2P） technology. MSPnet performs application-level structured DHT routing and resource location among domains and unstructured ones in domain. Except for media distribution, it can be used to support a variety of P2P applications, including video broadcasting, video on demand, VoIP, etc. MSPnet is composed of three layers, namely, the signal control layer, the management layer, and the media transportation layer. The MSPnet prototype consists of the SIP server, the management server, the media server, and the node User Agent （UA）. Results from a prototype experiment in a large-scale Internet environment show that MSPnet is feasible, scalable and manageable.

摘要：集成电路是信息时代重要的技术基础,也是国家战略竞争力的重要标志.在全球范围内,集成电路技术正处于快速变革与创新的新时期.面向集成电路未来发展,需要针对先进器件及集成工艺、模拟与混合电路、电路设计方法、新型计算架构等方面开展前沿研究,加强规划布局,完善创新系统,推动我国集成电路产业在未来发展中占得先机.基于第347期“双清论坛(青年)”,本文总结了我国集成电路科学研究及产业发展面临的国家重大需求,研判分析了集成电路领域国内外的发展态势和关键问题,展望了该领域重大的前沿发展趋势,探讨了前沿研究方向和科学基金资助战略,以期助推我国集成电路技术高质量发展.