基于聚类分析的3种新香型烤烟烟叶质量特征与香型评价

[目的]建立国产烤烟烟叶新香型风格特征的评价体系,为国内优质特色烟叶识别归类和卷烟生产提供参考。[方法]分别选取清甜香型、蜜甜香型和焦甜焦香型3种不同新香型C2F等级烤烟共60份样品,对其外观质量指标、感官质量指标、常规化学成分及中性香气物质分别采用主成分分析筛选能够有效区分不同香型风格的关键质量指标,最后通过聚类分析利用3组样品进行验证。[结果]主成分分析筛选出了区分3种新香型风格的4类主要质量特征指标,分别为2项外观质量指标(色度和油分)、4项感官质量指标(香气量、感官总分、浓度、刺激性)、3项常规化学成分(氯、总糖、钾)和5项中性香气物质(茄酮、二氢大马酮、巨豆三烯酮、二氢猕猴桃内酯、新植二烯)。筛选的14项质量特征指标能够较为准确地将验证组A组15个样品聚为3类,B组8个样品聚为5类,C组23个样品聚为4类,分类正确率分别为93.33%、87.50%和100%。[结论]筛选出的这14项指标可以准确判别不同烤烟香型风格,并可有效区分这3种不同新香型风格的烟叶。

基于相似论文增广的深度学习专利质量评估

实际操作中的专利质量评估多采用专家打分或者使用专家设计的质量评价指标,这导致评价过程存在主观性强、评价双方认可分歧大的问题,因此提出一种基于相似论文增广的深度学习专利质量评估方法。首先以论文作为客观评价数据,使用论文计算相似度作为增广数据来进行筛选,然后利用深度神经网络训练出能够实现论文相似性对待评估专利质量的映射的质量评估模型,最后利用评估模型估计专利质量。仿真结果表明不同领域下,在以满分为100分的前提下,所提方法得出的专利质量评估分数与对应的专家评价结果的平均误差均低于4,表明所提方法具备有效的专利质量评估能力。

Semi-reference image quality metric for virtual view images in free-viewpoint television

A semi-reference image quality assessment metric based on similarity measurement for synthesized virtual viewpoint image （VVI） in free-viewpoint television system （FFV） is proposed in this paper. The key point of the proposed metric is taking resemblant information between VVI and its neighbor view images for quality assessment to make our metric to be extended to multi-semi-reference image quality assessment easily. The proposed metric first extracts impact factors from image features, then combines an image synthesis technique and similarity functions, in which, disparity information are taken into account for registering the resemblant regions. Experiments are divided into three phases. Phase I is to verify the validation of the proposed metric by taking impaired images and original reference into account. The experimental results show the agreement between evaluation scores and bio-characteristic of human visual system. Phase II shows the accordance with Phase I by taking neighbor view as reference. The proposed metric can be taken as a full reference one to evaluate the image quality even though the original reference is absent. Phase III is then performed to evaluate the quality of WI. Evaluation scores in the experimental results are able to evaluate the quality of VVI.

燃气采暖热水炉星级产品分布分析

依据CGAC—G1—2022《家用燃气器具星级产品认证规则》,统计燃气采暖热水炉(简称燃气热水炉)的星级产品分布和质量特征指标限值分级占比,并进行分析。结果显示:对于星级产品分布,非冷凝式燃气热水炉(简称普通炉)以四星级产品居多,冷凝式燃气热水炉(简称冷凝炉)以五星级产品略居多。对于普通炉,燃气系统密封性、供暖额定热负荷偏差、极限热负荷时CO体积分数、噪声等效声级的A级限值分级占比接近或超过90%,这些指标的改进空间有限;氮氧化物含量、热效率的A级限值分级占比均低于40%,这些指标的改进空间很大。对于冷凝炉,燃气系统密封性、燃烧系统密封性、极限热负荷时CO体积分数、黄焰和不完全燃烧界限气工况下CO体积分数、噪声等效声级的A级限值分级占比均超过95%,这些指标的改进空间有限;氮氧化物含量的A级限值分级占比低于55%,此指标的改进空间很大。