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1.
详细分析了四柱式液压机液压系统的设计原理,总结了其主要的性能和特点。压机采用插装阀式集成阀块,具有多级调压能力,压力高、流量大,泄漏小,动作可靠等诸多优点。 相似文献
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图像翻译是一类重要的视觉问题,其目标是学习两个视觉域之间的映射,同时保持原始结构或语义。图像翻译研究领域主要存在两个难点,一是缺少配对的图片训练集;二是很难由单个输入产生多种输出。基于解表示的图像翻译模型(DRIT)虽然同时解决这两个难点,但输出的结果显示仍然存在生成图像质量不佳的问题。造成输出质量不佳的一个原因是由于从判别器到生成器的梯度反向传播过程较长,使得训练初期生成器的梯度所包含信息量较少。在DRIT模型研究基础上,本文提出了一种基于多层次判别的多目标图像翻译模型,一定程度上解决了生成图像质量不佳的问题。我们的数值实验结果也表明了本文提出的多层次判别结构对输出质量的提高具有一定的帮助。 相似文献
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While the orthogonal design of split-plot fractional factorial experiments has received much attention already, there are still major voids in the literature. First, designs with one or more factors acting at more than two levels have not yet been considered. Second, published work on nonregular fractional factorial split-plot designs was either based only on Plackett–Burman designs, or on small nonregular designs with limited numbers of factors. In this article, we present a novel approach to designing general orthogonal fractional factorial split-plot designs. One key feature of our approach is that it can be used to construct two-level designs as well as designs involving one or more factors with more than two levels. Moreover, the approach can be used to create two-level designs that match or outperform alternative designs in the literature, and to create two-level designs that cannot be constructed using existing methodology. Our new approach involves the use of integer linear programming and mixed integer linear programming, and, for large design problems, it combines integer linear programming with variable neighborhood search. We demonstrate the usefulness of our approach by constructing two-level split-plot designs of 16–96 runs, an 81-run three-level split-plot design, and a 48-run mixed-level split-plot design. Supplementary materials for this article are available online. 相似文献
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Throughout the developed world, community sports clubs are a high-risk setting for alcohol-impaired driving. The Good Sports program accredits community sports clubs to encourage implementation of alcohol-focussed harm-reduction and safe-transport strategies. This study tested for associations between participation in the Good Sports program and reduced rates of drink-driving amongst club members. Multilevel modelling indicated that for each season a club was in the program there was an 8% reduction in the odds of drink-driving. These findings may arise due to clubs with lower rates of alcohol use maintaining longer involvement in the program. However, the findings are also compatible with the intention of the Good Sports program to reduce the risk that club members will drive whilst alcohol impaired. 相似文献
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There is extensive literature concerning the divisible load theory. Based on the divisible load theory (DLT) the load can be divided into some arbitrary independent parts, in which each part can be processed independently by a processor. The divisible load theory has also been examined on the processors that cheat the algorithm, i.e., the processors do not report their true computation rates. According to the literature, if the processors do not report their true computation rates, the divisible load scheduling model fails to achieve its optimal performance. This paper focuses on the divisible load scheduling, where the processors cheat the algorithm. In this paper, a multi-objective method for divisible load scheduling is proposed. The goal is to improve the performance of the divisible load scheduling when the processors cheat the algorithm. The proposed method has been examined on several function approximation problems. The experimental results indicate the proposed method has approximately 66% decrease in finish time in the best case. 相似文献
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This paper proposed a multi-level principal component regression (PCR) modeling strategy for quality prediction and analysis of large-scale processes. Based on decomposition of the large data matrix, the first level PCR model divides the process into different sub-blocks through uncorrelated principal component directions, with a related index defined for determination of variables in each sub-block. In the second level, a PCR model is developed for local quality prediction in each sub-block. Subsequently, the third level PCR model is constructed to combine the local prediction results in different sub-blocks. For process analysis, a sub-block contribution index is defined to identify the critical-to-quality sub-blocks, based on which an inside sub-block contribution index is further defined for determination of the key variables in each sub-block. As a result, correlations between process variables and quality variables can be successfully constructed. A case study on Tennessee Eastman (TE) benchmark process is provided for performance evaluation. 相似文献
7.
随着大功率自关断器件和高速微控制芯片的不断发展,大功率电力电子装置的应用越来越广泛,传统的多重化结构由于受到变压器或电抗器尺寸、效率、价格及可靠性的限制,在功率等级提升的问题上遇到了极大的困难。多电平变流器的出现为解决这一问题提供了机会。在大功率电力电子装置中的另一个重要的问题就是大功率器件的工作频率较低,难以应用PW... 相似文献
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