基于重要度的民机备件单级初始库存优化配置

为了研究重要度对民机备件库存配置的影响,基于波音、空客模型理论建立了单级初始库存优化配置模型,结合边际分析法提出了分解协调边际分析法,实现了消耗件、周转件和可修件的库存优化配置.首先,阐述了考虑重要度情况的备件单级初始库存优化配置流程;其次,构建以机队可用度为优化目标,备件费用和保障概率为约束的备件单级初始库存优化配置模型;再次,运用分解协调边际分析法完成备件单级初始库存优化配置模型的求解;最后,将民机舱门系统作为研究对象,对其备件进行了初始库存优化配置.通过分析得到了满足约束条件的各个备件的初始库存优化配置数量,费用为170 684. 61美元,机队可用度为0. 9999;通过与传统的备件库存优化配置比较,验证了所提出方法的可行性和有效性.

传播隐私管理视阈下社会化媒体个人信息分享的边际困境

社会化媒体在移动互联网时代蓬勃发展,为人们提供了一个可以共享的虚拟仪式互动空间;人们被自我表露与交流的便捷性所驱动而参与到个人信息分享的传播行为当中,对风险的误判与感知钝化使得个人信息管理面临隐私悖论。传播隐私管理理论指出,信息传播形式的分散与人际交往圈层的模糊让个人信息分享的边际处于隐匿而变动的失调状态,对传播契约规则的商讨与对隐私保护体系及意识的强化有利于协调这种边际困境。

Controversy of International Carbon-motivated Border Tax Adjustment and Its Impact on China's Manufacturing Industries

Carbon-motivated border tax adjustment （BTA） aims to compensate for the loss of competitiveness of carbon intensive products due to carbon dioxide abatement actions. Based on the analysis of the international background of carbon-motivated BTAs, this paper discusses the fundamental motivation leading to US policy transformation, the potential impacts of the policy on China＇s manufacturing industries, and the compatibility of the policy to WTO rules. Carbon-motivated BTAs violate the fundamental principle of the UNFCCC, and potentially conflict with the core WTO principle of non-discrimination reflected in the GATT Articles 1 and III. However, Article XX of the GATT may be applicable. Thus, the author suggests several measures to alleviate the impacts of carbon-motivated BTAs, and puts forward countermeasures based on carbon consumption per capita.