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基于个性化度的个性化产品评价体系研究 被引量:2
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作者 杨沁 韩江洪 朱家诚 《农业机械学报》 EI CAS CSCD 北大核心 2006年第4期119-124,共6页
通过个性化产品的特征信息结构,基于个性化产品整个生命周期,构建产品的个性化度的评价模型和评价指标体系。着重讨论了开放度、约束度、关联度、复杂度及依赖度等指标的量化方法,从而确定个性化产品的个性化度的综合评价的量化指标,为... 通过个性化产品的特征信息结构,基于个性化产品整个生命周期,构建产品的个性化度的评价模型和评价指标体系。着重讨论了开放度、约束度、关联度、复杂度及依赖度等指标的量化方法,从而确定个性化产品的个性化度的综合评价的量化指标,为个性化产品的设计提供参考依据。最后通过应用举例来介绍产品个性化度的评价方法。 展开更多
关键词 个性化产品 特征信息结构 评价体系 评价指标 个性化度
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No-Reference Quality Assessment of Enhanced Images
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作者 Leida Li Wei Shen +3 位作者 Ke Gu Jinjian Wu Beijing Chen Jianying Zhang 《China Communications》 SCIE CSCD 2016年第9期121-130,共10页
Image enhancement is a popular technique,which is widely used to improve the visual quality of images.While image enhancement has been extensively investigated,the relevant quality assessment of enhanced images remain... Image enhancement is a popular technique,which is widely used to improve the visual quality of images.While image enhancement has been extensively investigated,the relevant quality assessment of enhanced images remains an open problem,which may hinder further development of enhancement techniques.In this paper,a no-reference quality metric for digitally enhanced images is proposed.Three kinds of features are extracted for characterizing the quality of enhanced images,including non-structural information,sharpness and naturalness.Specifically,a total of 42 perceptual features are extracted and used to train a support vector regression(SVR) model.Finally,the trained SVR model is used for predicting the quality of enhanced images.The performance of the proposed method is evaluated on several enhancement-related databases,including a new enhanced image database built by the authors.The experimental results demonstrate the efficiency and advantage of the proposed metric. 展开更多
关键词 image enhancement quality assessment NO-REFERENCE perceptual feature SVR
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Fatigue reliability assessment for bridge welded details using long-term monitoring data 被引量:24
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作者 DENG Yang DING YouLiang +1 位作者 LI AiQun ZHOU GuangDong 《Science China(Technological Sciences)》 SCIE EI CAS 2011年第12期3371-3381,共11页
A reliability assessment method of fatigue life based on the long-term monitoring data is developed for welded details in steel box girder,and the application research is presented with examples of welded rib-to-deck ... A reliability assessment method of fatigue life based on the long-term monitoring data is developed for welded details in steel box girder,and the application research is presented with examples of welded rib-to-deck details in Runyang Bridges. Firstly the fatigue damage limit-state function is established based on S-N curves and Miner's rule,and the probability distribution characteristics of the coefficients in the function are discussed in detail. The uncertainties in fatigue loading effects are mainly studied based on long-term monitoring data. In the traditional studies,only the uncertainty of equivalent stress range is considered in fatigue reliability assessment. However,stress cycle number is also treated as a random variable in this paper because we know traffic flow every day differs in a thousand ways. Then the optimization method is employed to calculate the fatigue reliability. After studying the changing law of the reliability indices with time and the effect of the randomness of stress cycle number on reliability,the effect of the traffic growth on the reliability is studied. This study shows that the uncertainty in the fatigue life of the welded details can be well studied based on structural health monitoring,so it is necessary to carry out long-term strain monitoring of the welded details for accurate fatigue reliability assessment during the whole service period. 展开更多
关键词 steel box girder fatigue loading effects equivalent stress range stress cycle number fatigue reliability traffic growth
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