基于CiteSpace的旅游服务设计研究可视化分析

目的 旅游服务设计发展态势良好，从旅游服务设计的角度进行文献可视化分析，可从中获得当前领域的知识结构、研究热点和发展态势，为未来提供旅游服务设计研究和旅游产业的服务设计参考。方法 从CNKI和Web of Science数据库收集1990—2020年国内外的相关数据，运用CiteSpace对旅游服务设计的文献发表时间、高度被引用的文献、研究热点和研究前沿进行可视化分析，比较国内外研究差异。结论 在1990—2020年国内外旅游服务设计研究皆呈上升趋势。国外的研究热度、被引频次高于国内，以跨学科领域研究尤为突出，研究重点在建筑环境和交通相关策略;而国内研究以产品服务系统为主，偏向于技术的实现方式。综观研究现状和趋势，本文从智慧科技旅游、可持续发展和全域旅游进行深入探讨，提出旅游服务设计新发展趋势。     

互联网时代下的学校图书管理信息化建设

如何在互联网时代打造一个信息化的管理模式,已经成为广大学校图书管理发展过程中亟待处理的问题。文章就互联网时代下的高职图书管理信息化建设进行了详细探讨,以期能够给广大同仁提供一些借鉴参考,共同为图书管理工作的现代化改革和发展贡献力量。     

基于形态审美的产品基因网络造型研究

目的 利用产品形态审美基因网络，对台灯外轮廓曲线的相关性进行综合分析，析出产品优化与创新设计的关键要素。方法 以三次贝塞尔曲线对台灯的外轮廓曲线进行基因编码，规律性调整控制点的坐标生成新曲线形态，进行曲线视觉力感知识别，挖掘曲线间的相关性;以曲线基因为节点，相关性为边构建产品形态审美基因网络，并对网络进行拓扑分析，析出关键设计节点辅助设计者进行产品设计。结果 运用产品形态基因网络的理论找到原型设计的关键性节点，并进行设计优化，使产品造型设计更符合消费者的审美习惯和偏好。结论 通过对台灯外轮廓线的案例实践，证实了产品形态基因网络在产品细节优化和造型创新设计方面具有实用性和可靠性，能够辅助设计者找到关键设计节点并协调设计的基因集团。     

新媒体环境下智慧化阅读推广研究——以重庆第二师范学院为例

开展智慧化阅读推广,紧跟时代步伐,有效提升读者多重阅读体验和满意度,增强智慧化阅读推广的价值,促进智慧化阅读推广服务的有效化、规范化、科学化、常态化、长期化发展,已成为当前阅读推广研究中一个重要的切入点。文章基于智慧化阅读研究,结合"新媒体"高新技术环境,提出智慧化阅读推广的内容分析、具体实施、环境构建、推广评估与效果、推广改进等几个方面组成的以读者为中心的核心服务体系。本文分析了智慧化阅读基本方面,以我校图书馆实际运用推广效果,智慧化阅读存在的优、劣势及相应的对策。     

No-Reference Video Quality Assessment using novel hybrid features and two-stage hybrid regression for score level fusion

This paper presents a novel No-Reference Video Quality Assessment (NR-VQA) model that utilizes proposed 3D steerable wavelet transform-based Natural Video Statistics (NVS) features as well as human perceptual features. Additionally, we proposed a novel two-stage regression scheme that significantly improves the overall performance of quality estimation. In the first stage, transform-based NVS and human perceptual features are separately passed through the proposed hybrid regression scheme: Support Vector Regression (SVR) followed by Polynomial curve fitting. The two visual quality scores predicted from the first stage are then used as features for the similar second stage. This predicts the final quality scores of distorted videos by achieving score level fusion. Extensive experiments were conducted using five authentic and four synthetic distortion databases. Experimental results demonstrate that the proposed method outperforms other published state-of-the-art benchmark methods on synthetic distortion databases and is among the top performers on authentic distortion databases. The source code is available at https://github.com/anishVNIT/two-stage-vqa.     

Benchmark experiment of large-angle scattering reaction cross section of iron at 14 MeV using two shadow bars – Comparison of experimental results with ENDF/B-VIII –

ABSTRACT

It is important to perform neutron transport simulations with accurate nuclear data in the neutronics design of a fusion reactor. However, absolute values of large-angle scattering cross sections vary among nuclear data libraries even for well-examined nuclide of iron. Benchmark experiments focusing on large-angle scattering cross sections were thus performed to confirm the correctness of nuclear data libraries. The series benchmark experiments were performed at a DT neutron source facility, OKTAVIAN of Osaka University, Japan, by the unique experimental system established by the authors’ group, which can extract only the contribution of large-angle scattering reactions. This system consists of two shadow bars, target plate (iron), and neutron detector (niobium). Two types of shadow bars were used and four irradiations were conducted for one experiment, so that contribution of room-return neutrons was effectively removed and only large-angle scattering neutrons were extracted from the measured four Nb reaction rates. The obtained experimental results were compared with calculations for five nuclear data libraries including JENDL-4.0, JEFF.-3.3, FENDL-3.1, ENDF/B- VII, and recently released ENDF/B-VIII. It was found from the comparison that ENDF/B-VIII showed the best result, though ENDF/B-VII showed overestimation and others are in large underestimation at 14 MeV.     

一种X射线环焊缝图像质量评价方法

为了缩小增强后环焊缝图像质量主客观评价的差距,提出了一种基于人眼视觉的无参考质量评价指标。通过分析人眼的视觉特性,建立图像模糊评价模型,设定主观评价方法;主客观评价值进行曲线拟合,经验证,评价结果与主观评价结果具有线性拟合关系,评价结果接近人眼最佳视觉,验证了评价指标的可行性。     

Training visual attention in a naturalistic visual environment

The efficiency of training visual attention in the central and peripheral visual field was investigated by means of a visual detection task that was performed in a naturalistic visual environment including numerous, time-varying visual distractors. We investigated the minimum number of repetitions of the training required to obtain the top performance and whether intra-day training improved performance as efficiently as inter-day training. Additionally, our research aimed to find out whether exposure to a demanding task such as a microsurgical intervention may cancel out the effects of training.

Results showed that performance in visual attention peaked within three (for tasks in the central visual field) to seven (for tasks in the periphery) days subsequent to training. Intra-day training had no significant effect on performance. When attention training was administered after exposure to stress, improvement of attentional performance was more pronounced than when training was completed before the exposure. Our findings support the implementation of training in situ at work for more efficient results.

Practitioner Summary: Visual attention is important in an increasing number of workplaces, such as with surveillance, inspection, or driving. This study shows that it is possible to train visual attention efficiently within three to seven days. Because our study was executed in a naturalistic environment, training results are more likely to reflect the effects in the real workplace.     

宏基因组文库新型β-葡萄糖苷酶的筛选、克隆及酶学性质分析

利用宏基因组文库方法,通过功能筛选法从文库中筛选到一个新型β-葡萄糖苷酶基因bgl2238(Gen Bank:KU320675.1),对新基因进行生物信息学分析和原核表达,并研究其酶学性质。结果表明,该基因全长2 238 bp,可编码745个氨基酸,通过氨基酸序列分析,预测bgl2238蛋白分子质量为80.67 k Da,p I值为4.95,是一种结构较稳定、疏水性高且无信号肽序列的酸性蛋白质;经同源性分析,发现其与来源于Bacteroides thetaiotaomicron的β-葡萄糖苷酶具有58%的相似性,属于GH3超家族和GH3C超家族酶。将重组质粒p ET-32a(+)-bgl2238转化入Escherichia coli BL2l(DE3)细胞进行异源表达,酶学性质测定结果显示,以对硝基苯基-β-D-吡喃葡萄糖苷(p-nitrophenyl-β-D-glucopyranoside,p NPG)为底物,β-葡萄糖苷酶bgl2238最适反应p H值和温度分别为6.10、44℃,此时该酶最大比活力达到29.1 U/mg;且在4~50℃范围内,热处理β-葡萄糖苷酶bgl2238 4 h后仍保留70%以上的酶活力,热稳定性较好;其动力学参数Vmax为576?μmo L/(L·min),Km为0.296 mmol/L;不同浓度的K+、Na~+、Fe~(2+)、Mg~(2+)、Mn~(2+)、Ca~(2+)、Co~(2+)和Ni~(2+)对酶活力均有较大促进作用,其中Fe~(2+)对bgl2238酶活力的促进作用最大,10 mmol/L Fe~(2+)使相对酶活力高达260%,而重金属离子Ag~+、Hg~(2+)及Cu~(2+)对酶活力有抑制作用。bgl2238具有良好的酶学性质,可以尝试应用于工业上纤维素降解的生产。     

基于深度卷积神经网络的视觉里程计研究

视觉里程计利用视频信息来估计相机运动的位姿参数，实现对智能体的定位。传统视觉里程计方法需要特征提取、特征匹配/跟踪、外点剔除、运动估计、优化等流程，解算非常复杂，因此，提出了基于卷积神经网络的方法来实现端对端的单目视觉里程计。借助卷积神经网络对彩色图片自动学习提取图像帧间变化的全局特征，将用于分类的卷积神经网络转化为帧间时序特征网络，通过三层全连接层输出相机的帧间相对位姿参数。在KITTI数据集上的实验结果表明，提出的Deep-CNN-VO模型可以较准确地估计车辆的运动轨迹，证明了方法的可行性。在简化了复杂模型的基础上，与传统的视觉里程计系统相比，该模型的精度也有所提高。