基于暗通道先验与 YOLO 的水下河蟹识别研究

为解决全自动均匀投饵作业船在河蟹养殖过程中投饵不精准问题,引入水下摄像设备采集图像,但采集的图像存在对比度低、模糊和图像退化等问题。为此,采用暗通道先验提高图像对比度。利用 YOLO 卷积神经网络技术快速准确地识别出低照度环境下的河蟹,识别准确率达到 98%,平均耗时 50ms。获得河蟹生长、分布信息后测算出河蟹养殖密度,为全自动均匀投饵作业船精准投饲提供数据支持     

Modelling impact of dredging and dumping in ebb-flood channel systems

For a channel-shoal system in a funnel-shaped basin the impact of dredging and dumping is investigated using a complex process-based model. First, the residual flow and sediment transport circulations are analysed for the channel-shoal pattern, which has emerged after a long-term model simulation. Results are compared to the Western Scheldt estuary, which forms the inspiration for this study. Subsequently, different dredge and dump scenarios are modelled, according to a conceptual model, in which ebb-and flood-channels and enclosed shoals form morphodynamic units (cells) with their own sediment circulation. Model results show that dumping sediment in a channel further reduces the channel depth and induces erosion in the opposite channel, which enhances tilting of the cross-section of the cell and eventually can lead to the degeneration of a multiple channel system into a single channel. The impact of different dredging and dumping cases agrees with results from a stability analysis. This means that this type of model applied to a realistic geometry can potentially be used for better prediction of the impact of human interventions.     

鲁西北地下水资源与水环境问题探讨

鲁西北古河道沉积具明显的阶段性,在垂向上,古河道自下而上粒径愈上愈细;横向上,沉积物自古河道主流带向两侧变细．古河道纵向上连续性好,是优良的含水层．对古河道区的水资源进行了分析和评价,认为本区的古河道可作为供水源地．分析地下水资源赋存条件和地下水资源开发利用的现状,揭示了因超量开采地下水而引发的诸多水环境问题,提出了合理开发利用对策与措施．     

高校突发事件网络舆情现状分析及疏导策略思考

以高校突发事件网络舆情为主要研究内容,通过对其基本概念阐述以及现状分析,进而试图寻找高校突发事件网络舆情的疏导策略和可行性建议,以此应对并消解互联网发展过程中给高校网络空间带来的挑战及负面影响。从而营造更加清朗、健康、和谐的校园网络环境,进一步筑牢大学生成长、成才的高校网络阵地。     

关于构建和谐楚雄的思考

和谐楚雄应该是民主法治、公平正义、诚信友爱、充满活力、安定有序、人与自然和谐相处的社会。构建和谐楚雄，当前应从以下六个方面做好工作：一要发扬民主，推进法治；二要维护安定，确保有序；三要注重公平，维护正义；四要崇尚诚信，增进友谊；五要加强统筹，全面发展；六要保护自然，促进人与自然和谐。     

上市公司国有股减持方式的多渠道选择

国有股比重过高且不能流通已经成为制约我国证券市场发展的现实障碍。本阐述了国有股减持的现实意义和操作过程中应遵循的基本,并详细分析了国有股减持在实际操作过程中存在的难点，而问题的解决依赖于多渠道的减持方式的顺利推行，并探讨了包括建立国有股减持基金、转换优先股、发行可转换债券、债权转股权和经营股票期权的国有股减持的多种方案。     

A simple channel estimator for space-time coded OFDM systems in rapid fading channels

A simple channel estimator for space-time coded orthogonal frequency division multiplexing (OFDM) systems in rapid fading channels is proposed. The channels at the training bauds are estimated using the EM (expectation-maximization) algorithm, while the channels at the data bauds are estimated based on the method for modelling the time-varying channel as the linear combination of several time-invariant "Doppler channels". Computer simulations showed that this estimator outperforms the decision-directed tracking in rapid fading channels and that the performance of this method can be improved by iteration.     

PhotoShop中蒙版、Alpha通道的概念及其应用

从理论联系实际的角度介绍图像处理软件PhotoShop中蒙版、通道和Alpha通道的概念,并且通过举例说明其具体用法.     

蜂窝系统中的同频干扰分析

基于Okumura-Hata传播模型，提出了一套新的同频干扰的估算方法，它考虑了移动通信中随机信道的特点、时间和地点概率、随机信号的非相干性、天线高度、发射功率、天线增益、路径距离以及蜂窝频率复用模式等多种因素对载干比得影响，同时在研究中还兼顾到不同地形地貌对信号的影响、单个干扰源和多个干扰源对信号接收的影响，提高了干扰计算的准确度和可信度。     

浅谈多媒体作品开发中的关键技术——Alpha通道

Alpha通道实质上是8位灰度图像,用来存储图像文件中代表各像素点透明度的附加信息。在多媒体作品开发中,对对象的透明度的处理相对灵活而且重要,因此Alpha通道技术就成了其中的关键技术。本文主要阐述了Alpha通道在常用多媒体作品开发软件中具体的应用方法。