图像中的声音表达--中国古代听松图的跨媒介阐释

图像何以表现声音,是一个艺术跨媒介表达的问题。中国古代听松图通过强化主体的听觉性在场、“一主一仆”图式的“合唱队”效果、构图留白隐喻风孔、以题画诗弥补画面松声等手段,使图像的松声得以审美显现。并且,频繁使用临水听松、松下士人图式,以音助圣,敞开自然的审美空间。此外,静听松风也是松声转化为遗音的过程,由实到虚,绵延回旋。对于听松图而言,与其说松声是通过画面空间表现的,不如说是由松声通过艺术动势,召唤空间、创造空间,以时间统领空间,从而完成了跨媒介的艺术表达。

A Novel Cross-Media Layered Semantic Mining Model

This paper presents a cross-media semantic mining model （CSMM） based on object semantic. This model obtains object-level semantic information in terms of maximum probability principle. Then semantic templates are trained and constructed with STTS （Semantic Template Training System）, which are taken as the bridge to realize the transition from various low-level media feature to object semantic. Furthermore, we put forward a kind of double layers metadata structure to efficaciously store and manage mined low-level feature and high-level semantic. This model has broad application in lots of domains such as intelligent retrieval engine, medical diagnoses, multimedia design and so on.

中国基础教育跨国吸引力的研究--基于242份英媒PISA文本的分析

在教育国际治理中,排行榜扮演了越来越重要的角色。以中国为代表的亚洲国家的基础教育系统在PISA排行榜中表现优异,近年来,西方发达国家逐渐改变了对亚洲基础教育系统的偏见,英国对上海的教育政策借鉴是反映中国基础教育系统跨国吸引力显著提升的典型案例。本研究运用菲利普斯的跨国吸引力理论对英国媒体关于中国基础教育的报道展开深入分析,发现中国基础教育对英跨国吸引力的产生是一个政策借鉴国和输出国双向互动的过程。受到内部不满、政治事务以及负面外部评价等因素影响希望进行教育改革的英国,经过对中国基础教育系统的调查了解,发现中国基础教育系统的指导哲学、目标、措施和支持结构对其具有吸引力。

Modeling of flow of oil-in-water emulsions through porous media

Formation and flow of emulsions in porous media are common in all enhanced oil recovery tech- niques. In most cases, oil-in-water （O/W） emulsions are formed in porous media due to oil-water interaction. Even now, detailed flow mechanisms of emulsions through porous media are not well understood. In this study, variation of rate of flow of O/W emulsions with pressure drop was studied experimentally, and rheological pa- rameters were calculated. The pressure drop increases with an increase in oil concentration in the O/W emulsion due to high viscosity. The effective viscosity of the emulsion was calculated from the derived model and expressed as a function of shear rate while flowing through porous media. Flow of O/W emulsions of different concentrations was evaluated in sand packs of different sand sizes. Emulsions were characterized by analyzing their stability, rheological properties, and tem- perature effects on rheological properties.

Bayesian Markov chain Monte Carlo inversion for anisotropy of PP-and PS-wave in weakly anisotropic and heterogeneous media

A single set of vertically aligned cracks embedded in a purely isotropic background may be con- sidered as a long-wavelength effective transversely iso- tropy （HTI） medium with a horizontal symmetry axis. The crack-induced HTI anisotropy can be characterized by the weakly anisotropic parameters introduced by Thomsen. The seismic scattering theory can be utilized for the inversion for the anisotropic parameters in weakly aniso- tropic and heterogeneous HTI media. Based on the seismic scattering theory, we first derived the linearized PP- and PS-wave reflection coefficients in terms of P- and S-wave impedances, density as well as three anisotropic parameters in HTI media. Then, we proposed a novel Bayesian Mar- kov chain Monte Carlo inversion method of PP- and PS- wave for six elastic and anisotropic parameters directly. Tests on synthetic azimuthal seismic data contaminated by random errors demonstrated that this method appears more accurate, anti-noise and stable owing to the usage of the constrained PS-wave compared with the standards inver- sion scheme taking only the PP-wave into account.

传统的内爆--当代版画的跨媒介可能

由于媒介的局限,当前版画的发展处于一种裹足不前的僵局状态。虽然传统的版画形式,如木刻、石版、丝网印刷、凹版,以及数字版画等并没有停止脚步,尤其是在学院之中,但这并不能掩盖版画在当代艺术格局中渐行渐远的失落局面。囿于自身技术局限的当代版画的未来在哪里?如何向前发展和创新,以便跟上时代和社会的步伐?本文追溯了版画角色的历史变迁,并在传统与当代的艺术史线性逻辑之中探讨当代版画的跨媒介可能。

A New Perspective on the Demand of the Cross-cultural Audiences:Lacuna and Universal Model

Lacuna and Universal Model provides a new terminology and classification for the factors behind the success and failure of cross-cultural media content,and thus forms an analysis framework for the study of the cross-cultural audiences'need.According to this model,the audience will dislike or not select foreign media content under these circumstances:(1)audiences find that the content is irrelevant or unsuitable;(2)audiences cannot comprehend the content;3)they do not like the style of such content.This model also argues that cross-cultural media content is successfully spread under these circumstances:(1)the media content shows attractive attribute to cross-cultural audience;(2)the media content is open to alternative readings.

Mobile Cloud for Personalized Any-Media Services

In this paper, we define mobile cloud computing and describe how it can be used for delivering advanced any-media services to both nomadic and mobile users. We focus on service delivery that is localized and personalized and suggest that virtualization and tighter cross-layer communication allows for convergence and seamless transition of services. These are also creating new and never-before seen ways of developing and delivering personalized any-media services. We discuss current paradigms for implementing cloud-based any-media services that generate revenue. Future research topics and requirements for evolving network and service elements are also discussed.

Variance Reduction Technique for Estimating Value-at-Risk based on the Cross - Entropy

Value-at-Risk （VaR） estimation via Monte Carlo （MC） simulation is studied here. The variance reduction technique is proposed in order to speed up MC algorithm. The algorithm for estimating the probability of high portfolio losses （more general risk measure） based on the Cross - Entropy importance sampling is developed. This algorithm can easily be applied in any light- or heavy-tailed case without an extra adaptation. Besides, it does not loose in the performance in comparison to other known methods. A numerical study in both cases is performed and the variance reduction rate is compared with other known methods. The problem of VaR estimation using procedures for estimating the probability of high portfolio losses is also discussed.

基于Resnet-Bert网络模型的跨媒体检索方法

针对跨模态检索研究中模态较少以及效果不佳问题,提出一种基于Resnet-Bert网络模型的跨媒体检索方法。利用图像识别较佳的卷积神经网络模型Resnet与文本处理效果较佳的Bert模型,在图像、视频、音频和文本四种媒体类型数据之间建立跨媒体统一表征类别标签空间。通过不同模态信息的迁移学习与关联挖掘,实现了更高的跨媒体检索精度。在公开数据集上进行实验,采用平均精度均值指标作为评价指标。试验表明,提出的方法在跨媒体检索效果上具有提升作用。

“内外兼修”企业社交媒体使用对突破式创新的驱动机制研究

数字化时代社交媒体蓬勃发展,为企业突破式创新带来了机遇。现实中,如何运用社交媒体实现突破式创新是企业面临的重要问题。结合组织学习理论、社会资本理论,从内外部视角探索两种社交媒体可供性对企业突破式创新的差异化作用机制。结果显示,内部整合导向的社交媒体使用通过组织忘却学习促进突破式创新,外部营销导向的社交媒体使用通过加深跨界用户嵌入促进突破式创新。此外,双元战略导向在两条路径上分别发挥调节作用。创业导向水平越高,内部整合导向的社交媒体使用对组织忘却学习的促进作用越显著;市场导向水平越高,外部营销导向的社交媒体使用对跨界用户嵌入的推动作用越显著。结论有助于丰富社交媒体与突破式创新相关研究,为企业应用社交媒体技术实现突破式创新提供启示。

当代的艺术跨媒介性与“诗意中心”

随着“音舞诗画”等新兴艺术形式的流行,艺术作品的跨媒介特质已成为一个较为“亮眼”的存在。交往、融合、间性是艺术作品跨媒介性的三个重要范畴。艺术媒介的间性一方面保留了艺术自身的高度自主性,另一方面也阻碍了媒介间的良性交往和融合。当下复合型艺术媒介的形式越发多样,因此有必要寻找间性的中心位,以它为“轴”去观测艺术媒介交往、融合、间性三者联动的可能,并寻找联动的“最大公约数”。诗意因其开放的朦胧多义性、瞬时的感悟性和优雅的艺术品格,可以成为跨媒介性的观察中心。面对进入21世纪以来蓬勃、繁杂的艺术现场,以诗意中心为轴,可以灵活化解间性可能对跨媒介艺术进一步融合造成的阻碍。

First assessment of Noise-Equivalent Sigma-Zero in GF3-02 TOPSAR mode with sea surface wind speed retrieval

Gaofen-3-02(GF3-02)is the first C-band synthetic aperture radar(SAR)satellite with terrain observation with progressive scans of SAR(TOPSAR)imaging mode in China,which plays an essential role in marine environment monitoring.Given the weak scattering characteristics of the ocean,the system thermal noise superimposed on SAR images has significant interference,especially in cross-polarization channels.Noise-Equivalent Sigma-Zero(NESZ)is a measure of the sensitivity of the radar to areas of low backscatter.The NESZ is defined to be the scattering cross-section coefficient of an area which contributes a mean level in the image equal to the signal-independent additive noise level.For TOPSAR,NESZ exhibits the shape of the SAR scanning gain curve in the azimuth and the shape of the antenna pattern in the range.Therefore,the accurate measurement of NESZ plays a vital role in the application of spaceborne SAR sea surface cross-polarization data.This paper proposes a theoretical calculation method for the NESZ curve in GF3-02 TOPSAR mode based on SAR noise inner calibration data and the imaging algorithm.A method for correcting the error existing in the theoretical curve of NESZ is also proposed according to the relationship between sea surface backscattering and wind speed and the same characteristics of target scattering in the overlapping area of adjacent sub-swaths.According to assessment with wide-swath TOPSAR cross-polarization data,the GF3-02 TOPSAR mode has a very low thermal noise level,which is better than−33 dB at the edge of each beam,and controlled below−38 dB at the center of the beam.The two-dimensional reference curves of the NESZ of each beam are provided to the GF3-02 TOPSAR users.After discussing the relationship between normalized radar cross section(NRCS)and wind speed,we provide a formula for NRCS related to wind speed and radar incidence angle.Compared with the NRCS derived from this formula and the NESZ-subtracted NRCS of SAR images,the bias is−0.0048 dB,the Root Mean Square Error is 1.671 dB and the correlation coefficient is 0.939.

基于扎根理论的跨境电商品牌形象塑造研究

为指导跨境电商企业更好地在海外市场塑造品牌形象,提升品牌的国际竞争力,文章基于扎根理论,以跨境电商代表性品牌SHEIN为例,对其在社交平台Instagram上发布的956张宣传图片进行内容分析。借助NVivo 11.0软件,完成201个节点编码,并以此生成34个初始范畴、11个主范畴和5个核心范畴。研究发现,基于社交媒体渠道的跨境电商品牌形象塑造,围绕产品特性、消费者形象、品牌价值表达、营销活动、服务互动五个维度展开,其中产品特性与消费者形象传播最为主要,而采用符号化语言的内容输出进一步丰富了品牌跨文化背景下的个性表达。

利用数字媒体和多元化途径助推中国文化遗产的国际传播

随着全球化的发展,文化交流已成为连接不同国家和民族的重要桥梁。文化遗产作为一个国家文化软实力和展示国际形象的载体,在国际交流中发挥着举足轻重的作用。传统的推广方式已无法满足今天的时代发展,数字媒体为文化遗产的海外传播提供了新的平台和可能。同时,文化艺术交流、教育交流、旅游合作等多种方式也有助于扩大文化遗产的国际影响力。通过对国内外相关文化遗产的案例研究,分析数字媒体和多元化方式在传递价值观、增强国际认同感和激发创新思维方面的应用,探讨传播过程中存在的问题和挑战,采取多维策略确保文化遗产传播的积极影响,有利于提升中国文化遗产的国际传播效果。

用于跨介质航行器的后掠机构分析

主要阐述跨介质航行器后掠结构的设计和分析。对航行器介质转换的平滑过渡,包括机翼的收放机制、结构设计、静力学和动力学分析等多个方面进行重点研究。利用有限元分析和模态分析,展示了机翼结构在受到载荷时的响应,分析了机翼在折叠展开过程中对机构整体的气动影响。此外,通过力矩仿真进一步验证后掠机构设计的合理性和实用性,有效减弱50%入水冲击,水下航行速度提升2.5倍,过渡时间缩短1.8 s。研究成果揭示了后掠机构在改善航行器介质转换性能方面的有效性,为跨介质航行器的设计和性能优化提供了新方法。

基于异质图注意力网络与多特征融合的跨社交媒体用户识别研究

跨社交媒体用户识别对于网络舆情的协同治理以及用户偏好的全方位识别与预测具有重要的指导意义。针对现有方法存在数据表达能力弱、忽略用户信息的动态性和关联性的问题,本文提出一种融合异质特征嵌入与实体动态关联的跨社交媒体用户识别模型。首先,整合用户的基本属性、生成内容和社交结构信息,构建各个社交媒体的异质信息网络;其次,通过设计新的元路径识别策略构造邻接矩阵,使用异质图注意力网络模型汇聚用户节点信息,增强节点特征的表示能力;再其次,引入了3种连续时间衰减函数,对跨社交媒体的实体相似矩阵进行加权,增强实体之间的动态关联;最后,融合单社交网络和跨社交网络中的以上特征,利用多层感知机实现跨社交媒体用户的识别和预测。在微博-知乎真实数据集中的研究结果显示,本文模型的整体性能优于其他基准模型,特别是线性衰减函数,其展现了最佳效果,且本文提出的元路径识别策略对提升用户识别效果具有重要作用。

Fixed-Bed Column Adsorption Modeling of MnO4- Ions from Acidic Aqueous Solutions on Activated Carbons Prepared with the Biomass

Activated carbons calcined at 400˚C and 600˚C (AC-400 and AC-600), prepared using palm nuts, collected in the town of Franceville in Gabon, were used to study the dynamic adsorption of MnO4- ions in acidic media on fixed bed column and on the kinetic modeling of experimental data of breakthrough curves of MnO4- ions obtained. Results on the adsorption of MnO4- ions in fixed-bed dynamics obtained on AC-400 and AC-600 adsorbents beds indicated that the AC-400 bed appears to be the most efficient in removing MnO4- ions in acidic media. Indeed, the adsorbed amounts, the adsorbed capacities at saturation and the elimination percentage of MnO4- ions obtained with AC-400 (31.24 mg;52.06 mg·g-1 and 41.65% respectively) were higher compared to those obtained with AC-600 (9.87 mg;16.45 mg·g-1 and 17.79% respectively). The breakthrough curves kinetic modeling revealed that the Thomas model and the pseudo-first-order kinetic model were the most suitable models to describe the adsorption of MnO4- ions on adsorbents studied in our experimental conditions. The results of the intraparticle diffusion model showed that intraparticle diffusion was involved in the adsorption mechanism of MnO4- ions on investigated adsorbents and was not the limiting step and the only process controlling MnO4- ions adsorption. In contrast to AC-400, the intraparticle diffusion on AC-600 bed plays an important role in the adsorption mechanism of MnO4- ions.

“前推”与“主导”:艺术时空体与跨媒介叙事

在艺术“分立”之后,特定媒介艺术的发展有两种方式:求“纯”或求“异”。求“纯”即通过发挥并强化特定媒介的“本位”特色来发展门类艺术;求“异”其实就是我们所说的跨界融合或跨媒介叙事问题。跨媒介叙事主要有三种基本类型:时间艺术与空间艺术之间的相互模仿;一种空间艺术与另一种空间艺术之间的相互模仿;一种时间艺术与另一种时间艺术之间的相互模仿。其中第一种是最主要的跨媒介叙事类型。无论是对于哪种情况的跨媒介叙事现象,我们都可以运用穆卡洛夫斯基的“前推”思想、雅各布森的“主导”思想,并结合巴赫金的“艺术时空体”理论而进行合理的解释。一切文学艺术作品都是艺术时空体,所谓跨媒介叙事无非是违反或背离艺术媒介的本质特性,在小说等时间艺术叙事中把本来处于“背景”位置的空间元素“前推”为“主导”元素,在绘画等空间艺术叙事中把本来处于“背景”位置的时间元素“前推”为“主导”元素。

计及筒盖与筒口气团的航行体出筒流场演化分析

筒口结构及流场环境是影响航行体出筒过程多相流场与载荷特性的重要因素,文章数值研究了计及筒内高温高压气体作用的航行体出筒过程,分析了不同初始条件、边界条件对航行体头部、尾部气团演化过程及筒内“水体倒灌”效应的影响及航行体、筒盖的载荷特性.结果表明:横向牵连速度条件下,航行体头部出筒伴随筒口气团的偏移、破碎、分离和汇集过程;尾出筒时高温高压气团与周围附体气团融合,并经膨胀、颈缩后产生回射流现象;随着尾空泡形成,筒口截面处气团发生二次拉断、射流偏移现象,筒内“水体倒灌”呈“螺旋”倒灌方式.横向牵连速度主导着筒口绕流流场特征,其降低50%时筒盖载荷峰值降低了58.27%;筒口气团初体积直接影响出筒航行体附体气团体积,筒口气团初始高度增加50%时筒盖载荷峰值降低了17.64%;筒盖形状决定着其绕流流场载荷特性,相比之下筒盖弯曲系数较小时,筒盖载荷峰值降低31.48%;而筒盖开盖角度是诱导气团二次拉断射流偏移的主要原因,开盖角度由60°降低到30°时,筒盖最大受载峰值降低72.03%.