排序方式： 共有35条查询结果，搜索用时 31 毫秒
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鲁晓辉 《宁波职业技术学院学报》2015,(3)
针对视频水印的特征,提出一种利用视频帧采样点均值曲线相交性确定嵌入帧的方法：在水印信息嵌入时,利用嵌入帧三个亮度最大分块位置关系和DC值大小实现每帧2bit信息的嵌入。实验证明,该算法对常规攻击具有良好的鲁棒性。 相似文献
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From a number of ML estimators (typically unbiased) of practical interest which include the variance for a Gaussian distribution, the standard deviation for a Laplace distribution, the variance for a Rayleigh distribution and a “spread parameter” for a Cauchy distribution, we design robust estimators according to an emphasis balance between normalized performance and normalized robustness. We measure performance with inverted MSE and robustness with a differential geometric approach. 相似文献
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《Information processing & management》2023,60(2):103223
Aspect-based sentiment analysis aims to determine sentiment polarities toward specific aspect terms within the same sentence or document. Most recent studies adopted attention-based neural network models to implicitly connect aspect terms with context words. However, these studies were limited by insufficient interaction between aspect terms and opinion words, leading to poor performance on robustness test sets. In addition, we have found that robustness test sets create new sentences that interfere with the original information of a sentence, which often makes the text too long and leads to the problem of long-distance dependence. Simultaneously, these new sentences produce more non-target aspect terms, misleading the model because of the lack of relevant knowledge guidance. This study proposes a knowledge guided multi-granularity graph convolutional neural network (KMGCN) to solve these problems. The multi-granularity attention mechanism is designed to enhance the interaction between aspect terms and opinion words. To address the long-distance dependence, KMGCN uses a graph convolutional network that relies on a semantic map based on fine-tuning pre-trained models. In particular, KMGCN uses a mask mechanism guided by conceptual knowledge to encounter more aspect terms (including target and non-target aspect terms). Experiments are conducted on 12 SemEval-2014 variant benchmarking datasets, and the results demonstrated the effectiveness of the proposed framework. 相似文献
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提出一个基于深度防御思想的内网信息防御系统,阐述系统组成结构和各作用模块的作用。从可信任的角度介绍了系统的立体式、全方位防御思想。对系统设计中的重点模块核心技术进行了分析,给出主要模块的完成方案。为了防止系统在工作中异常卸栽或删除,解释了系统的自保护机制完成方案。 相似文献
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鲁棒分析桥接了软件分析与设计之间的鸿沟,是实现软件过程可追溯性的重要环节和不可或缺的技术,但其机理缺乏研究.研究了鲁棒分析的基本思想;解析了其内在机制;探索了鲁棒图中对象之间的交互机理,扩展了其交互规则;分析了鲁棒图的本质和在MDA软件范型中的建模作用,使得模型具有继承性、转化性和进化性. 相似文献
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本文设计了一个典型Mamdani类PD型模糊控制器来研究卫星大角度姿态机动控制问题。卫星姿态机动控制要求控制系统响应快、具有较强鲁棒性。模糊控制器的设计十分灵活,在控制性能方面有自己突出的特点。通过仿真,考察了模糊控制器的隶属函数在各种参数下的不同控制性能,与一个传统I/O解耦PID控制器的控制效果进行比较,并验证了模糊控制器的鲁棒性。仿真结果证实模糊控制用于姿态机动控制有良好的效果。 相似文献
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滑模变结构控制方法在PMSM调速系统中的应用 总被引：2，自引：0，他引：2
论述了滑模变结构控制方法，介绍了滑模变结构控制方法在永磁同步电动机调速系统中的应用。 相似文献
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数字水印技术及应用 总被引：2，自引：0，他引：2
吴淑英 《温州职业技术学院学报》2005,5(4):29-31
多媒体信息的数字化，提高了信息表达的效率和准确度，而数字媒体的易于存储、复制、传播和修改，使得数字多媒体版权盗用问题严重。数字水印技术作为版权保护和安全认证的有效工具，在快速发展的同时得到了广泛的应用。 相似文献
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Components within micro-scale engineering systems are often at the limits of commercial miniaturization and this can cause unexpected behavior and variation in performance. As such, modelling and analysis of system robustness plays an important role in product development. Here, schematic bond graphs are used as a front end in a sensitivity analysis based strategy for modelling robustness in multi-physics micro-scale engineering systems. As an example, the analysis is applied to a behind-the-ear (BTE) hearing aid.By using bond graphs to model power flow through components within different physical domains of the hearing aid, a set of differential equations to describe the system dynamics is collated. Based on these equations, sensitivity analysis calculations are used to approximately model the nature and the sources of output uncertainty during system operation. These calculations represent a robustness evaluation of the current hearing aid design and offer a means of identifying potential for improved designs of multiphysics systems by way of key parameter identification. 相似文献