基于改进GA 的多机舰面转运规划

针对复杂环境下的多舰载机舰面同时转运避碰规划问题,提出基于遗传算法的路径规划方法。分析多机 同时转运问题,设计目标函数和约束条件;建立舰载机碰撞检测计算公式、基于交通规则的等停策略和重规划策略、 非均匀有理B 样条(non-uniform ration B-spline,NURBS)平滑策略;通过遗传算法对不同数量舰载机同时转运场景 进行仿真。仿真试验结果表明：该方法在复杂环境下能有效规划出转运路径,可靠性好、适航性强,能为多机舰面 同时转运提供科学有效的决策方法。     

Self‐Powered Distributed Water Level Sensors Based on Liquid–Solid Triboelectric Nanogenerators for Ship Draft Detecting

Ship draft measurement is of great significance for ensuring navigation safety and facilitating ship control. In this work, a self‐powered water level sensor based on a liquid–solid tubular triboelectric nanogenerator (LST‐TENG) is proposed and analyzed. The LST‐TENG is made of multiple copper electrodes uniformly distributed along a polytetrafluoroethylene (PTFE) tube. When water flows into the PTFE tube, it induces alternating flows of electrons between the main electrode and the distributed bottom electrodes. The obvious peaks in the derivative of open‐circuit voltage with respect to time are found to correspond with the electrode distribution. Then it can be utilized as a robust and sensitive indicator for detecting the water level as the number of obvious peaks in the derivative of open‐circuit voltage is directly related to the water level height. The ship draft is successfully detected using the LST‐TENG with an accuracy of 10 mm. It shows that the water level sensor has stable performance for liquid–solid interface monitoring. Therefore, this LST‐TENG is self‐powered, robust, and accurate for extensive applications in marine industry.     

Local Immune‐Triggered Surface‐Modified Stem Cells for Solid Tumor Immunotherapy

Here, described are additional treatment strategies that make use of human mesenchymal stem cell (hMSC)‐based local immunotherapeutic agents for the treatment of solid tumors. Dibenzocyclooctyne‐poly(ethylene glycol)‐pheophorbide A conjugates are engineered for cell surface conjugation by copper‐free click chemistry and are subsequently conjugated to hMSC (hMSC‐DPP). hMSC‐DPP can recognize and migrate toward cancer lesions, where they secrete pro‐inflammatory cytokines such as interleukin (IL)‐6, IL‐8, and heat shock protein 70 in pursuance of photodynamic therapy‐mediated cell death. The secreted immune factors trigger interferon gamma, IL‐2, IL‐4, IL‐12, and granulocyte‐macrophage colony‐stimulating factor, resulting in the local accumulation of T cells, B cells, natural killer cells, and antigen presenting cells at the tumor site. Treatment with hMSC‐DPP induces the accumulation of cytokines at the cancer site and minimizes systemic immune‐based side effects. This strategy is expected to increase the vulnerability of cancer cells to immune cells and cytokines, thus aiding in the development of a robust treatment platform for cancer immunotherapy.     

Mimicking Neuroplasticity in a Hybrid Biopolymer Transistor by Dual Modes Modulation

Neuromorphic computing systems that are capable of parallel information storage and processing with high area and energy efficiencies, offer important opportunities for future storage systems and in‐memory computing. Here, it is shown that a carbon dots/silk protein (CDs/silk) blend can be used as a light‐tunable charge trapping medium to fabricate an electro‐photoactive transistor synapse. The synaptic device can be optically operated in volatile or nonvolatile modes, ensuring concomitant short‐term and long‐term neuroplasticity. The synaptic‐like behaviors are attributed to the photogating effect induced by trapped photogenerated electrons in the hybrid CDs/silk film which is confirmed with atomic force microscopy based electrical techniques. In addition, system‐level pattern recognition capability of the synaptic device is evaluated by a single‐layer perceptron model. The remote optical operation of neuromorphic architecture provides promising building blocks to complete bioinspired photonic computing paradigms.     

融合用户信任度和相似度的基于核心用户抽取的鲁棒性推荐算法

推荐系统可以方便地帮助人们做出决策,然而,目前很少有研究考虑到剔除不相关噪声用户的影响,保留少量核心用户做推荐。该文提出基于信任关系和兴趣相似度的核心用户抽取的新方法。首先计算所有用户对之间的信任度和兴趣相似度并且排序,然后根据用户在最近邻列表中出现的频率和位置权重两种策略选择候选核心用户集合,最后利用用户的推荐能力筛选出最终的核心用户并且做推荐。实验表明利用核心用户做推荐的有效性,并且证明了利用20%的核心用户做推荐,可以达到超过90%的准确性,而且利用核心用户做推荐能很好地抵御托攻击对推荐系统造成的负面影响。

     

High efficiency,high switching speed,AlGaAs/GaAs P-HEMT DC–DC converter for integrated power amplifier modules

This paper presents a high efficiency, high switching frequency DC–DC buck converter in AlGaAs/GaAs technology, targeting integrated power amplifier modules for wireless communications. The switch mode, inductor load DC–DC converter adopts an interleaved structure with negatively coupled inductors. Analysis of the effect of negative coupling on the steady state and transient response of the converter is given. The coupling factor is selected to achieve a maximum power efficiency under a given duty cycle with a minimum penalty on the current ripple performance. The DC–DC converter is implemented in 0.5 μm GaAs p-HEMT process and occupies 2 × 2.1 mm² without the output network. An 8.7 nH filter inductor is implemented in 65 μm thick top copper metal layer, and flip chip bonded to the DC–DC converter board. The integrated inductor achieves a quality factor of 26 at 150 MHz. The proposed converter converts 4.5 V input to 3.3 V output for 1 A load current under 150 MHz switching frequency with a measured power efficiency of 84%, which is one of the highest efficiencies reported to date for similar current/voltage ratings.     

High performance and low-cost single switch energy-recovery sustaining driver for AC plasma display panel

A new energy-recovery sustaining driver for an AC plasma display panel (PDP) is proposed. Since it has only one auxiliary switch compared with the four of the prior circuit, its size and cost can be greatly reduced. Moreover, it features the fast transition time of the panel polarity, fully charged and discharged PDP and soft switching of all power switches.     

A simulation-based multi-objective design optimization of electronic packages under thermal cycling and bending

In this study, a simulation-based multi-objective design optimization methodology was developed for improving electronic packaging reliability. It was demonstrated using a generic model of an electronic package on a printed wiring board. The objective for the optimization was to improve the reliability of solder joints under both thermal cycling and bending by optimizing a group of design parameters. A parametric finite element model was developed using ANSYS for both load conditions. To improve the numerical efficiency of the optimization, a multi-quadric response surface method was implemented to approximate the response of finite element simulations for each loading condition. Subsequently, the multi-objective optimization of solder joint reliability was implemented using a Minmax principle on all response surfaces and a differential evolution algorithm as optimal search engine, which is capable of finding global minimum when local minima exist. Our study demonstrated that the reliability of the solder joints is significantly improved for this given generic model of electronic package. The proposed methodology can be effectively used in improving the reliability of electronic packages.     

地下综合管线信息系统中矢量图元的开发与嵌入

数字化地形图的获取和更新是地下综合管线系统大规模应用的一个瓶颈。通过对大量矢量图元的分析和研究，提出了利用矢量图元开发和嵌入的方法解决上述问题，并且用Visual Basic和Maplnfo、Delphi和MapX分别实现了矢量图元的开发和嵌入。经实验验证，该方法正确、合理，满足了地下综合管线信息系统推广的要求。     

本原a-LFSR序列的迹表示及其应用

-LFSR是一基于字的LFSR模型,它的设计充分利用了现代CPU特点,可很好地应用于设计适合快速软件实现的序列密码算法中.而在实际应用中,本原-LFSR序列具有最核心的作用.该文分析了本原-LFSR序列的产生条件,利用其迭代关系式和有限域的迹函数,给出了它的具体表达式,从而得到本原-LFSR序列的迹表示;其次由本原-LFSR序列的迹表示,给出了一个-LFSR序列为本原的充要条件.它们为进一步研究本原-LFSR序列提供了新的工具.