Strategies for customer service level protection under multi-echelon supply chain disruption risk

We model a multi-echelon system where disruptions can occur at any stage and evaluate multiple strategies for protecting customer service if a disruption should occur. The strategies considered take advantage of the network itself and include satisfying demand from an alternate location in the network, procuring material or transportation from an alternate source or route, and holding strategic inventory reserves throughout the network. Unmet demand is modeled using a mix of backordering and lost sales. We conduct numerical analysis and provide recommendations on selecting strategic mitigation methods to diminish the impact of disruptions on customer service. We demonstrate that the greatest service level improvements can be made by providing both proactive inventory placement to cover short disruptions or the start of long disruptions, and reactive back-up methods to help the supply chain recover after long or permanent disruptions.     

Supply Chain Cooperation between Coal Enterprise and Electric Power Enterprise in China

Based on the two-stage Stackelberg game method, value creation of supply chain cooperation between coal enterprise and power utilities is studied by formulating profit functions of coal and power enterprises and calculating the maximum profit. According to the analysis, it is found that the profit from supply chain cooperation between coal and power enterprises is more than that of non- cooperation. The cooperation is validated to be beneficial for both units; however, the profit is mainly taken by the power enterprise. Thus, it is necessary to set up the incentive mechanism to distribute cooperation value between coal and power enterprises to promote their continual cooperation.     

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电力工业是国民经济发展的最重要的基础能源产业,做好电力物流和供应链的管理在电力产业中具有重要意义。本文简要介绍了电力物流以及电力供应链的基本概念,分析了电力供应链的特点及传统电力供应链管理模式的问题,结合现代供应链管理的方法与观念探讨了电力供应链管理方法的改革设想。     

基于职业能力培养的高职供应链管理课程教学改革与优化

《供应链管理》是高职物流管理专业的专业核心课程之一,该课程对于学生的职业素质养成及基于供应链的现代物流经营与管理职业能力培养具有非常重要的时代意义。该课程的主要核心内容为较抽象的企业间博弈关系,课程面向的工作对象具有时间跨度长和空间跨度大的特点。通过重新设计和定位课程,重组教学内容,创新教学模式并对教学方法和手段等进行改革,增强了学生学习的积极性和主动性,强化了学生职业素质的养成及关键能力和职业能力的培养。     

基于iPOE电源的新型船用iDC数据中心集成方案设计

分析船舶网络应用现状和POE电源的不足,提出一种新型i DC数据中心设计方案。该方案将船舶网络中的服务器、交换机、路由器、iPOE电源、无线接入设备和配线架等集成到一个紧凑型的桌面或墙挂机箱中,同时改进传统的POE电源为强化监管和控制的iPOE电源。具体研发内容包括以太网交换机、WiFi/Bluetooth LE路由器、iPSE控制器、iPD设备端分离器、iPD延长器、iPD合成器/分离器等电路设计和软件设计,网络服务器主板选型,以及iDC整机设计和控制软件设计。实船验证表明,该方案使设备体积减小了80倍,重量减小了25倍,功耗减小了9倍,成本减小了2倍,并降低了船上布线工程复杂度,方便了网络使用。     

Assessment of product debundling trends in the US airline industry: Customer service and public policy implications

This paper reviews product debundling trends that have occurred in the US airline industry. Multiple sources of ancillary fees related to ticketing refunds and exchanges, checked baggage, on-board pets, preferred and/or advanced seating assignments, frequent flyer ticket redemptions, and day of departure standby policies are reviewed. Despite the fact that both low cost and network carriers stress the importance of future ancillary fees in their investor reports, our assessment suggests that these fees will be more broadly adopted by low cost carriers. We anticipate that many network carriers will eliminate ancillary fees, particularly as they begin to recognize how these fees can impact other system performance objectives such as minimizing the number of misconnecting passengers. We estimate that the debundling phenomenon has diluted revenues to the US Airport and Airways Trust Fund by at least 5%.     

基于供应链视角的黄磏站石碴运输组织优化研究

石碴作为常见的建筑材料,是建筑产业依赖的建筑原料之一。黄磏站作为重庆市办理石碴运输的重要车站,以其毗邻长江的区位优势,石碴运输量日渐增加,在阐述黄磏站石碴运输组织现状的基础上,分析黄磏站石碴运输组织存在的问题,通过构建黄磏站石碴运输组织SCOR模型,以供应链视角,结合目前供应链模型中各个环节出现的问题,从托运环节、承运环节、收货环节、搬出环节和生产环节提出黄磏站石碴运输组织优化对策,以有效提高黄磏站石碴运输组织效率,带动重庆市乃至西南地区的建筑产业的健康发展,为黄磏站有效融入铁水联运体系打下坚实基础。     

Modal split in offshore supply network under the objective of emissions minimization

We study modal split under the objective of emissions minimization in the transportation of cargo from centralized vendors in the oil and gas industry to decentralized supply bases on the Norwegian coast. The supply network includes direct road transport and a sea route along the coast. To gain insight into modal split decisions between road and sea transport from the shipper’s perspective multi-period mixed integer optimization models are formulated. Particularly the models give possibilities to examine how weekly demand patterns at supply bases, cargo commitments to sea transport, storage possibilities at supply bases, and shipper’s responsibility for a certain share of vessel capacity may effect the emissions and the modal split. Experiments on real data from an oil and gas company operating offshore show that the size of the share of vessel capacity and the possibility for storage at supply bases are the major determinants for a larger shift to environmentally friendly sea transport. The models can be used as means for making decisions regarding how a shipper can commit to sea transport to achieve less emissions.     

Robust supply vessel routing and scheduling

We solve the problem of tactical supply vessel planning arising in the upstream offshore petroleum logistics. Supply vessels deliver all the necessary materials and equipment to offshore installations from an onshore supply base according to a delivery schedule. The planning of supply vessels should be done so that their number is minimized and at the same time provide a reliable flow of supplies from the base. The execution of a weekly sailing plan is affected by weather conditions, especially in winter time. Harsh weather conditions increase the number of vessels required to perform the operations as well as the service times at the installations, and thus disrupt the schedule, leading to additional costs and reduced service level. We present a methodology for robust supply vessel planning enabling a trade-off analysis to be made between the schedules’ service level and vessels’ cost. The methodology involves the generation of multiple vessel schedules with different level of robustness using an adaptive large neighbourhood search metaheuristic and a subsequent discrete event simulation procedure for the assessment of the service level. To control the level of robustness we developed a concept of slacks and incorporated it into the metaheuristic algorithm.     

施工企业财务风险的形成与对策分析

分析了施工企业财务风险的形成,提出降低财务风险的对策。