文化遗产数字化与互动性推广模式——基于新媒介载体的文化产业开发

文化遗产的数字化不仅可以有效保护与传承文化,还可以与新媒介结合进行互动式推广。利用数字技术、网络技术、移动通信技术等新媒介推广文化的模式有:富媒体虚拟场景展示、IGA软性推广、虚拟真实互动等。通过这些方式可实现新媒介与文化遗产推广推介的结合、虚拟场景与真实景观的结合、线上互动与线下互动的结合。通过互动性推广,辐射大众、涵盖小众,并影响多目标人群的参与与关注。     

Adaptive multiple importance sampling for Gaussian processes

In applications of Gaussian processes (GPs) where quantification of uncertainty is a strict requirement, it is necessary to accurately characterize the posterior distribution over Gaussian process covariance parameters. This is normally done by means of standard Markov chain Monte Carlo (MCMC) algorithms, which require repeated expensive calculations involving the marginal likelihood. Motivated by the desire to avoid the inefficiencies of MCMC algorithms rejecting a considerable amount of expensive proposals, this paper develops an alternative inference framework based on adaptive multiple importance sampling (AMIS). In particular, this paper studies the application of AMIS for GPs in the case of a Gaussian likelihood, and proposes a novel pseudo-marginal-based AMIS algorithm for non-Gaussian likelihoods, where the marginal likelihood is unbiasedly estimated. The results suggest that the proposed framework outperforms MCMC-based inference of covariance parameters in a wide range of scenarios.     

Bayesian expectile regression with asymmetric normal distribution

In this paper, we adopt the Bayesian approach to expectile regression employing a likelihood function that is based on an asymmetric normal distribution. We demonstrate that improper uniform priors for the unknown model parameters yield a proper joint posterior. Three simulated data sets were generated to evaluate the proposed method which show that Bayesian expectile regression performs well and has different characteristics comparing with Bayesian quantile regression. We also apply this approach into two real data analysis.     

高端装备制造业知识网络有效性影响因素分析

分析影响高端装备制造业知识网络有效性的五个因素,构建知识网络有效性模型并进行仿真分析,得出结论:企业为提高知识吸收能力和知识释放意愿所做投入在一定范围内可以提升知识网络有效性,投入超过一定值后,这种提升作用不再明显;企业较高的知识水平、企业间良好的合作关系与适当的知识势差可以提高知识网络有效性,并根据仿真结果提出相关建议。     

基于个性化需求的产品竞争供应链结构选择

基于"制销分离"与"定制一体"两种结构选择，构建个性化产品供应链处于非竞争与竞争环境下的博弈模型，在引入一个实际案例的基础上，运用算例仿真比较分析两种运营模式下的供应链运作策略和盈利差异。结果显示：与制销分离结构相比，个性化产品供应链选择定制一体结构，有利于匹配产品个性化制造、提升产品个性化水平和市场需求、增加供应链的期望收益；个性化产品供应链选择制销分离结构时，适度的批发价格激励能够提升产品个性化水平、更好满足消费者个性化需求、改善供应链的运营绩效，分销商适度让利加大批发价格激励力度可显著促进产品个性化制造互动、提升产品个性化水平；竞争将消减个性化产品供应链的运营绩效，但选择定制一体结构可显著提升竞争力。     

产品服务供应链的“双重收益共享”合作机制

产品与服务融合缓解了"供需错位"矛盾，使得产品服务供应链探索成为"供给侧结构性改革"下供需结构性匹配的重要路径。本文刻画产品服务视角下供应链组织结构的本质特征，构建产品服务供应链合作模型，探讨合作机制下"帕累托改进"区间存在性，揭示合作机制对产品服务供应链效率的作用机理。核心研究发现：供应链多元化组织结构加剧收益分配冲突，并导致服务规模与供应链效率"倒挂"现象，而合作机制下"双重收益共享"合作模型能提升产品服务供应链效率。     

Bayesian inference for stable Lévy–driven stochastic differential equations with high‐frequency data

In this paper, we consider parametric Bayesian inference for stochastic differential equations driven by a pure‐jump stable Lévy process, which is observed at high frequency. In most cases of practical interest, the likelihood function is not available; hence, we use a quasi‐likelihood and place an associated prior on the unknown parameters. It is shown under regularity conditions that there is a Bernstein–von Mises theorem associated to the posterior. We then develop a Markov chain Monte Carlo algorithm for Bayesian inference, and assisted with theoretical results, we show how to scale Metropolis–Hastings proposals when the frequency of the data grows, in order to prevent the acceptance ratio from going to zero in the large data limit. Our algorithm is presented on numerical examples that help verify our theoretical findings.     

考虑订货协调成本与数量折扣的改良品供应链水平协调

在单个供应商与多个销售商构成的二级改良品供应链中，销售商们采用联合补货方式不仅可以分摊订货成本，而且由于订货批量的增加从而更易获得供应商提供的数量折扣合同。建立多个销售商在独立补货与联合补货中的利润水平函数，推导联合补货优于独立补货的充要条件。将销售商之间的联合补货行为转化成多人合作博弈问题，证明博弈具有的基本性质，设计基于博弈核心的利润分配方法。通过数值算例和敏感性分析验证了文中所构建模型的正确性。     

Predatory purchasing practices in global apparel supply chains and the employment relations squeeze in the Indian garment export industry

While the literature has long acknowledged worker rights abuses in global apparel supply chains, less attention has been paid to the recent worsening of certain decent work deficits and its causes, which this article links to predatory purchasing practices arising from growing power asymmetries. These practices, illustrated here by the garment export industry in India, exert downward pressure on wages and incite non‐standard forms of employment and greater verbal and physical abuse as productivity demands rise. They can be addressed through pricing mechanisms that cover the cost of decent work, appropriate State regulation and worker involvement.     

The translocal villagers. Mining,mobility and stratification in post-apartheid South Africa

Internal labour migration from rural areas to urban centres has been and remains one of the dominant patterns of migration in South Africa. Based on data from ethnographic field research, this paper explores the mobility patterns and translocal relations of miners in the Northern Cape province of South Africa. By considering the tension between mobility and locality in a historical and political perspective, the concept of translocality helps to explain why miners try to expand their action space and, at the same time, why they are embedded in certain places. Thus, a translocal perspective enhances the interpretation of the spatio-temporal transformations in South Africa’s mining communities and beyond, as it sheds light on the agency of mine workers, superseding merely structuralist explanations.