The decision-making and optimization of two-echelon inventory coordination were analyzed with service level constraint and controllable lead time sensitive to order quantity.First,the basic model of this problem was e...The decision-making and optimization of two-echelon inventory coordination were analyzed with service level constraint and controllable lead time sensitive to order quantity.First,the basic model of this problem was established and based on relevant analysis,the original model could be transformed by minimax method.Then,the optimal order quantity and production quantity influenced by service level constraint were analyzed and the boundary of optimal order quantity and production quantity was given.According to this boundary,the effective method and tactics were put forward to solve the transformed model.In case analysis,the optimal expected total cost of two-echelon inventory can be obtained and it was analyzed how service level constraint and safety factor influence the optimal expected total cost of two-echelon inventory.The results show that the optimal expected total cost of two-echelon inventory is constrained by the higher constraint between service level constraint and safety factor.展开更多
In the field of logistics and transport, safety stock has become an important part of establishing safety stock, which enables enterprises to predict demand which cannot be guaranteed;safety stock build is to improve ...In the field of logistics and transport, safety stock has become an important part of establishing safety stock, which enables enterprises to predict demand which cannot be guaranteed;safety stock build is to improve service levels, and improves consumer the satisfaction, thereby enhancing the credibility of enterprises for corporate profits. However, the establishment of safety stock is bound to make the cost of business increase, after studies show that the safety stock in the logistics field cannot continue to increase down needs and logistics, logistics and speed limit orders supply chain into account, only in this way, the field of logistics safety stock is the most effective method of logistics.展开更多
Road Diets are far from a new technique for designers to apply to roadways. Yet after over 50 years of implementation and countless studies into their effectiveness, it is only relatively recently that the process is ...Road Diets are far from a new technique for designers to apply to roadways. Yet after over 50 years of implementation and countless studies into their effectiveness, it is only relatively recently that the process is gaining widespread recognition and implementation. Each year, more states and countries are examining potential road diets and putting them into place. Still, there remains great skepticism and opposition in many corners. In addition, cities and states may be drawing from many of the same sources in how to go about the process of a road diet and evaluate them, yet their methodology, goals, and even terminology can vary from region to region. This study analyzes the implementation of a road diet along a one-way arterial road, in Newark, Delaware. The primary aim of this analysis is to evaluate the feasibility of introducing a dedicated bicycle infrastructure to enhance local accessibility and to quantify its potential impacts on traffic flow, parking availability, and loading logistics within the vicinity. While the reduction of one lane could be perceived as a constraint on traffic management, the investigation revealed that E Main Street, the roadway analyzed, for the most part, can adequately accommodate its traffic load with a single lane. Detailed findings underscore the notable enhancement in level of service and subsequent reduction in delay times across most surveyed approaches.展开更多
交通安全服务水平(level of service of safety,LOSS)是国内外交通安全研究领域的新概念,用来描述道路的交通安全状况和道路为交通参与者提供交通安全服务的一种质量指标。系统地介绍了交通安全服务水平的国内外研究现状、概念定义、应...交通安全服务水平(level of service of safety,LOSS)是国内外交通安全研究领域的新概念,用来描述道路的交通安全状况和道路为交通参与者提供交通安全服务的一种质量指标。系统地介绍了交通安全服务水平的国内外研究现状、概念定义、应用和研究内容,研究了分级指标的选取,提出了σ理论的交通安全服务水平划分方法,分级量化了我国平原和山区高速公路的交通安全服务水平。交通安全服务水平作为定量评价交通安全的一种新方法,不仅可以用来描述改善交通安全的潜力有多大,而且可以作为交通安全改造工程实施对象的参考。展开更多
基金Project(71102174,71372019)supported by the National Natural Science Foundation of ChinaProject(9123028)supported by the Beijing Natural Science Foundation of China+3 种基金Project(20111101120019)supported by the Specialized Research Fund for Doctoral Program of Higher Education of ChinaProject(11JGC106)supported by the Beijing Philosophy&Social Science Foundation of ChinaProjects(NCET-10-0048,NCET-10-0043)supported by the Program for New Century Excellent Talents in University of ChinaProject(2010YC1307)supported by Excellent Young Teacher in Beijing Institute of Technology of China
文摘The decision-making and optimization of two-echelon inventory coordination were analyzed with service level constraint and controllable lead time sensitive to order quantity.First,the basic model of this problem was established and based on relevant analysis,the original model could be transformed by minimax method.Then,the optimal order quantity and production quantity influenced by service level constraint were analyzed and the boundary of optimal order quantity and production quantity was given.According to this boundary,the effective method and tactics were put forward to solve the transformed model.In case analysis,the optimal expected total cost of two-echelon inventory can be obtained and it was analyzed how service level constraint and safety factor influence the optimal expected total cost of two-echelon inventory.The results show that the optimal expected total cost of two-echelon inventory is constrained by the higher constraint between service level constraint and safety factor.
文摘In the field of logistics and transport, safety stock has become an important part of establishing safety stock, which enables enterprises to predict demand which cannot be guaranteed;safety stock build is to improve service levels, and improves consumer the satisfaction, thereby enhancing the credibility of enterprises for corporate profits. However, the establishment of safety stock is bound to make the cost of business increase, after studies show that the safety stock in the logistics field cannot continue to increase down needs and logistics, logistics and speed limit orders supply chain into account, only in this way, the field of logistics safety stock is the most effective method of logistics.
文摘Road Diets are far from a new technique for designers to apply to roadways. Yet after over 50 years of implementation and countless studies into their effectiveness, it is only relatively recently that the process is gaining widespread recognition and implementation. Each year, more states and countries are examining potential road diets and putting them into place. Still, there remains great skepticism and opposition in many corners. In addition, cities and states may be drawing from many of the same sources in how to go about the process of a road diet and evaluate them, yet their methodology, goals, and even terminology can vary from region to region. This study analyzes the implementation of a road diet along a one-way arterial road, in Newark, Delaware. The primary aim of this analysis is to evaluate the feasibility of introducing a dedicated bicycle infrastructure to enhance local accessibility and to quantify its potential impacts on traffic flow, parking availability, and loading logistics within the vicinity. While the reduction of one lane could be perceived as a constraint on traffic management, the investigation revealed that E Main Street, the roadway analyzed, for the most part, can adequately accommodate its traffic load with a single lane. Detailed findings underscore the notable enhancement in level of service and subsequent reduction in delay times across most surveyed approaches.
文摘交通安全服务水平(level of service of safety,LOSS)是国内外交通安全研究领域的新概念,用来描述道路的交通安全状况和道路为交通参与者提供交通安全服务的一种质量指标。系统地介绍了交通安全服务水平的国内外研究现状、概念定义、应用和研究内容,研究了分级指标的选取,提出了σ理论的交通安全服务水平划分方法,分级量化了我国平原和山区高速公路的交通安全服务水平。交通安全服务水平作为定量评价交通安全的一种新方法,不仅可以用来描述改善交通安全的潜力有多大,而且可以作为交通安全改造工程实施对象的参考。
