Benefits of Hybrid Lateral Transshipments in Multi‐Item Inventory Systems under Periodic Replenishment

Lateral transshipments are a method of responding to shortages of stock in a network of inventory‐holding locations. Conventional reactive approaches only seek to meet immediate shortages. The study proposes hybrid transshipments which exploit economies of scale by moving additional stock between locations to prevent future shortages in addition to meeting immediate ones. The setting considered is motivated by retailers who operate networks of outlets supplying car parts via a system of periodic replenishment. It is novel in allowing non‐stationary stochastic demand and general patterns of dependence between multiple item types. The generality of our work makes it widely applicable. We develop an easy‐to‐compute quasi‐myopic heuristic for determining how hybrid transshipments should be made. We obtain simple characterizations of the heuristic and demonstrate its strong cost performance in both small and large networks in an extensive numerical study.     

试论数字色彩应用

介绍色彩数字编程和色彩数字设计方法。将数字的可变性应用到色彩编程和色彩设计之中,以期对艺术设计中手工颜料调配、提高色彩的准确度及色彩的复制与研究提供参考。     

Hard thresholding regression

In this paper, we propose the hard thresholding regression (HTR) for estimating high‐dimensional sparse linear regression models. HTR uses a two‐stage convex algorithm to approximate the ?₀‐penalized regression: The first stage calculates a coarse initial estimator, and the second stage identifies the oracle estimator by borrowing information from the first one. Theoretically, the HTR estimator achieves the strong oracle property over a wide range of regularization parameters. Numerical examples and a real data example lend further support to our proposed methodology.     

Building Virtual Age-Friendly Communities in Minecraft

A key theme of Age-Friendly Honolulu’s initiative is intergenerational exchange. The initiative believes that youth need to be aware of aging issues, demographic change, and think critically about the potential impact on their lives. The goal of the Age-Friendly Honolulu Youth Engagement Initiative is to teach youth about the role of the built environment and community features in promoting active aging and engagement among older adults. This article describes a new program in the field that teaches youth and older adults to assess the built environment and then use design thinking and Minecraft (a popular video game in which players use 3-D blocks to create virtual lands) to develop and envision ideas to improve the livability of their neighborhood.     

多阶段均值—半方差模糊投资组合决策研究

考虑交易成本、借款限制、阀值约束和基数约束,提出多阶段均值—半方差模糊投资组合模型。在该模型中,收益水平被定义为可能的平均回报,风险水平被定义为回报的半方差。由于交易成本和基数约束,多阶段投资组合模型为具有路径依赖性的混合整数动态优化问题。文章提出了前向动态规划方法求解。最后,以一个具体的算例比较了不同的基数约束投资组合的最优投资策略。     

均值绝对偏差资产组合选择模型的算法

对均值绝对偏差模型进行了简化,并利用一种旋转算法求解。这种算法比单纯形算法的计算简便,且计算量更小。利用上海和深圳股市1 072支股票70期周末收盘价所作的实验结果表明,对于资产无上界限制的模型,计算20个不同最优投资组合需要1 274次旋转运算,上界为10%时需要1 570次旋转运算,每 次旋转运算约需1 14171次加法和乘法运算。     

非计算机专业“计算机程序设计”课程教学调查与思考

针对高校非计算机专业学生“计算机程序设计”课程分析教学方面存在的问题,指出非计算机专业程序设计课程教学模式改革,需要避免教学目标单一性,加强相关专业的结合,创新教学手段。     

一类投资组合模型的模糊两阶段算法

对多目标证券组合投资模型进行了研究,模型以风险损失率作为风险。该模型是一多目标线性优化问题,我们采用模糊折衷算法对模型进行了求解,算例给出了该模型的一个实例的最优解。     

走出误区——浅论酒店公关策划的媒介选择

媒介选择是酒店公关策划的重要内容之一,但在中国酒店公关策划的实践中,此环节往往出现种种偏误,从而妨碍了公关功能的有效发挥.造成此种状况的原因,既有意识、理念方面的因素,也有运作模式上的障碍.为更有效利用各种媒介,实现酒店公关工作的目标,在进行媒介选择时,酒店公关策划者应依据公关策划目标、公关对象特点、媒介传播规律和效益原则来选择酒店公关信息的传播媒介.     

计算机在酸碱溶液pH值计算中的应用

设计了一种计算强酸(碱)及三元以内弱酸(碱)pH 值的通用程序。该程序解决了多元酸(碱)二级电离不可忽略的计算问题,其计算结果与实验值相一致。