A Study for Operational Planning for Multi-Temperature Joint Distribution System
|關鍵字:||全溫層物流;供需互動;軸輻網路;差異化運送策略;Multi-Temperature Joint Distribution;Demand-Supply Interaction;Hub andSpoke Network;Discriminatory Delivery Strategy|
The continued growth of demand on multi-temperature products and wide spread of timely customer demand has greatly contributed to the challenge of logistics carriers. Under the multi-temperature joint distribution system and various deterioration of products, how to design a comprehensive hub and spoke network and service strategy to serve consumers with distinct dynamic demand has become an important issue for a multi-temperature joint distribution carrier to achieve cost effective while maintain the maximized customer satisfaction. In practice, the categories of the distribution system include regular and multi-temperature product distribution. Some studies have analyzed the problems on distributing regular and/or specific-temperature products but few of them focused on multi-temperature products. Past studies have largely discussed the development of techniques applied in the multi-temperature joint distribution system. Moreover, in the field of physical distribution problems, the multi-temperature joint distribution problem combined with techniques employed and dynamic demand are seldom discussed. Furthermore, there are no current studies formulating mathematical models and aiming to discuss the discriminatory delivery service strategy for air cargo carrier in response to demand-supply interaction and timely demand of multi-temperature products. The proposed study attempts to explore above issues by formulating a series of models. This study attempts to propose operational planning for multi-temperature joint distribution system under dynamic demand. Then, the study develops a series of models on analyzing land and air cargo carriers』 operational decisions, such as temperature-controlled technique, the size and types of vehicle fleet, vehicle routing, delivery and shipping service strategies, shipping charges for standard and special services by applying network models, heuristics, analytical models and mathematical programming models. The three-year study includes three topics. In the first year, the hub-and-spoke network design problem in response to time-dependent and multi-temperature demand for multi-temperature joint distribution carriers is studied. The hub-and-spoke network design problem in the study solves both strategic and operational decisions by employing two stage heuristic methods. The prior planning problem solves the number of each type of vehicles, types of techniques used in the network and vehicle routing by means of branch-and-bound methods. According to the results obtained from the first stage and relaxations, the linear programming problem in the second stage can be solved in a reasonable time, to determine the product delivery routes, shipping frequency and the size of vehicles. In the second year, this study attempts to optimize a delivery service strategy for multi-temperature joint distribution carries by considering dynamic, spatial and time-dependent demand, demand-supply interaction, and deterioration characteristics of various products. First, this study employs the analytical method to formulate retailer demand function by considering the remaining shelf life of products and shipping fee, where the remaining shelf life depends on the deterioration of products, lead time and delivery time. The costs considered are transportation cost, inventory cost, penalty cost for violating customers』 delivery time-windows and energy cost for maintaining the optimal temperature for various products in the delivery process. Furthermore, this study develops a mathematical programming model for determining the optimal delivery service cycles and charges for shipping differential temperature products, taking into account demand-supply interaction. In the third year, this study not only investigates the relationship between the demand and service strategies of express and standard air service but also proposes a mathematical programming modal on determining flight frequency and shipping charges of various temperature products for air cargo carriers. This study first formulates a shippers』 shipping alternative choice model. Shippers』 choices between express and standard shipping services are dependent on demand factors such as cargo value, amount and temperature-controlled requirement as well as supply attributes such as shipping charge, flight frequency and express handling and custom service. Then, this study formulates air carrier』s cost functions including transportation cost, handling cost and additional cost for temperature controlled equipment with respect to express and standard shipping services. Furthermore, this study formulates a mathematical programming model to determine the optimal flight frequency for express and standard services and surcharge for different temperature products with demand-supply interaction by maximizing the airline』s total profit. Finally, a series of case studies about the selected multi-temperature joint distribution carrier and air cargo carriers will be provided to illustrate the results and the application of the developed models. Consequently, the expected results of the developed models can provide basis on studies regarding distribution routes, product delivery strategy and airline service strategy in the context of multi-temperature joint distribution problems. Furthermore, the results may shed light on multi-temperature joint distribution carrier and airlines regarding their decision-making on operating strategy, marketing, delivery service strategy in response to the determination nature of multi-temperature products and timely delivery requirement of customers.
|Appears in Collections:||Research Plans|