公交车站牌报站屏的设计

介绍了新型太阳能公交车站牌报站显示系统。该系统利用太阳能、LED显示和微控制技术,采用W78E58单片机作为系统的中央控制单元,可实现同一站牌不同路数公交车站点的静态显示、动态显示和定时显示控制。利用VB软件编程可实现PC机通信,通过RS232接口可对整个系统升级,提高了系统的可操作性。整个系统采用太阳能供电,蓄电池作为后备电源,可有效节约电能。     

基于加强的前景图像纹理的图像检索方法

针对人们对前景图像比较敏感的特性,提出了一种加强前景信息并弱化背景信息的新方法.该方法首先通过图像的阈值得到前景图像与背景图像,利用某个值加强前景并弱化背景,结合原始图像提取纹理特征,从而进行图像检索.对真实图像数据库的检索实验表明,该方法与其他基于纹理的方法相比,具有较好的检索效果和性能.     

一种水下主动探测系统的模拟预处理机设计

模拟预处理机是水下主动探测系统的关键部件.针对水下主动探测系统的应用,设计了一种模拟预处理机,该电路采用分级放大结构,并使用两级滤波器对信号进行滤波处理,在达到对信号放大倍数要求的同时避免了放大器自激,采用噪声性能好的AD867X系列芯片有效抑制了电路噪声对信号的影响.分析了该模拟预处理机的工作原理,给出了电路结构图,并选择了芯片,调试检测结果表明,电路工作正常,性能指标达到要求.     

Harmonic 1-form based skeleton extraction from examples

This paper presents a method to extract skeletons using examples. Our method is based on the observation that many deformations in real-world applications are isometric or near isometric. By taking advantage of the intrinsic property of harmonic 1-form, i.e., it is determined by the metric and independent of the resolution and embedding, our method can easily find a consistent mapping between the reference and example poses which can be in different resolutions and triangulations. We first construct the skeleton-like Reeb graph of a harmonic function defined on the given poses. Then by examining the changes of mean curvatures, we identify the initial locations of joints. Finally we refine the joint locations by solving a constrained optimization problem. We demonstrate the efficacy of the proposed framework by pose space deformation, skeleton transfer, shape segmentation and pose-invariant shape signature.     

一个手机整句输入算法的研究与实现

随着时代的发展,手机在人们生活中起着越来越重要的作用。目前,相对于其他丰富多采的手机应用,手机输入法研究相对较少。该文针对手机存储空间小、计算能力低的特点,提出了一种整句查找算法。文章首先介绍了使用倒序排列的文件结构,然后根据该文件结构设计出一种宽度为N的整句查找算法,并在手机S60平台上实现了整句输入系统。文章最后对该整句算法的输入正确率进行了测试。实验结果表明,该算法有着较好的效果。     

Response map evaluation for RGBT tracking

Neural Computing and Applications - In recent years, RGB and thermal sensors are widely used. There is complementary information from these two types of sensors. A fundamental task which arises in...     

一种特征转移和域自适应的异质缺陷预测方法

软件缺陷预测是软件工程领域中的一个研究热点.跨项目缺陷预测(Cross-Project Defect Prediction, CPDP)采用源项目的缺陷数据来预测目标项目的缺陷倾向性.然而,源项目和目标项目的特征可能会有所不同.因此,研究人员提出了异质缺陷预测(Heterogeneous Defect Prediction, HDP).为了提高HDP模型的性能,本文提出了一种基于特征迁移和域自适应的异质缺陷预测(Feature Transfer and Domain Adaptation, FTDA)方法.首先,FTDA使用基于相关性的特征选择算法从源项目的特征集中选择最优的特征子集.随后,使用欧氏距离进行匹配特征,并为每个目标项目选择最合适的源项目.再次,使用TCA算法解决不同项目之间的分布差异问题.最后,使用SMOTETomek算法处理类不平衡问题.为了验证FTDA方法的有效性,本文对AEEEM,PROMISE,NASA和Relink数据集中的24个项目进行了实证研究.实证研究表明,FTDA显著提高了异质缺陷预测的性能.     

In Situ Observation of Crystallization of Methylammonium Lead Iodide Perovskite from Microdroplets

It is of great importance to investigate the crystallization of organometallic perovskite from solution for enhancing performance of perovskite solar cells. Here, this study develops a facile method for in situ observation of crystallization and growth of the methylammonium lead iodide (MAPbI₃) perovskite from microdroplets ejected by an alternating viscous and inertial force jetting method. It is found that there are two crystallization modes when MAPbI₃ grows from the CH₃NH₃I (MAI)/PbI₂/N,N‐dimethylformamide (DMF) solution: needle precursors and granular perovskites. Generally, needle Lewis adduct of MAPbI₃·DMF tends to nucleate and grow from the solution due to low solubility of PbI₂. The growth of MAPbI₃·DMF depends on both the concentration of MAI and temperature. It tends to form large perovskite domains on substrates at high temperature. The MAPbI₃·DMF coverts to nanocrystalline perovskite due to lattice shrinkage when DMF molecules escape from the Lewis adduct. Granular perovskite can also directly nucleate from the solution at high concentration of MAI due to compositional segregation.     

A Metal–Polyphenol Network Coated Nanotheranostic System for Metastatic Tumor Treatments

As a characteristic trait of most tumor types, metastasis is the major cause of the death of patients. In this study, a photothermal agent based on gold nanorod is coated with metal (Gd³⁺)‐organic (polyphenol) network to realize combination therapy for metastatic tumors. This nanotheranostic system significantly enhances antitumor therapeutic effects in vitro and in vivo with the combination of photothermal therapy (PTT) and chemotherapy, also can remarkably prevent the invasion and metastasis due to the presence of polyphenol. After the treatment, an 81% decrease in primary tumor volumes and a 58% decrease in lung metastasis are observed. In addition, the good performance in magnetic resonance imaging, computerized tomography, and photothermal imaging of the nanotheranostic system can realize image‐guided therapy. The multifunctional nanotheranostic system will find a great potential in diagnosis and treatment integration in tumor treatments, and broaden the applications of PTT treatment.     

Design of dynamic genetic memory

In electronic systems, dynamic random access memory (DRAM) is one of the core modules in the modern silicon computer. As for a bio‐computer, one would need a mechanism for storage of bio‐information named ‘data’, which, in binary logic, has two levels, logical high and logical low, or in the normalised form, ‘1’ and ‘0’. This study proposes a possible genetic DRAM based on the modified electronic configuration, which uses the biological reaction to fulfil an equivalent RC circuit constituting a memory cell. The authors implement fundamental functions of the genetic DRAM by incorporating a genetic toggle switch for data hold. The results of simulation verify that the basic function can be used on a bio‐storage module for the future bio‐computer.Inspec keywords: DRAM chips, genetic engineering, biocomputers, bioinformatics, equivalent circuits, RC circuitsOther keywords: dynamic genetic memory design, electronic systems, dynamic random access memory, modern silicon computer, biocomputer, bioinformation, binary logic, logical high level, logical low level, normalised form, genetic DRAM, modified electronic configuration, biological reaction, equivalent RC circuit, memory cell, fundamental functions, genetic toggle switch, data hold, biostorage module