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Synchronization in cross-docking networks: A research classi

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Gailwalin Anggooranon

on 27 October 2014

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Transcript of Synchronization in cross-docking networks: A research classi

Cross-docking
strategy that enables the consolidation of less-than-truckload shipments into full truckloads without long-term storage.
Literature review and classification
The framework
conceptualization
Fig.1
Synchronization in cross-docking networks: A research classification and framework
Due to the absence of a storage buffer inside a cross-dock, local and network-wide cross-docking operations need to be carefully synchronized ranging from strategic design to operational planning.
objective is to fill that gap and advance from an understanding of solving isolated problems
Organized in 6 section
3 common defining elements
1. A few-to-many network
2. A many-to-many network configuration
Fig.2
problem class definitions
First deriving all decision variables from the models pro- posed in the reviewed journal papers.
Next, analyzing whether variables address a similar decision developed a set of distinct decision problems.
Finally, we compared the complete set of decision problems with our observations in practice.

Fig.3
Illustrative cross-docking synchronization problems
Fig.6
1 Tactical-strategic cross-docking synchronization problem
Fig.7
- Network planning >>assigning capacity to the network routes and allocating freight flows to those routes.

-Cross-dock design and planning >> which, and how many, of the dock doors at the RDC should be dedicated

-Synchronization >> specify the individual decision problems from multiple isolated problem
Operational cross-docking synchronization problem
Fig. 8
-
Network scheduling
>> Inbound side, network routes connecting the NDCs to the cross-docks. concerned with dispatching shipments to each trailer departing ,,, outbound side is connecting each cross-dock to its retailers and determining the vehicle routes replenishing the retailers
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Cross-dock scheduling
>> many internal operations, The outbound trailer schedule thus boils down to the decision at which dock door each outbound trailer is served
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Synchronization
>> network and cross-dock schedules are appropriate, or even feasible, depends greatly on the outputs from one another.
3. Solution design methodologies
Conclusions
1. Description of the basic operations performed at the cross-dock.
2. Specification of the typical constraints and objectives associated with operations
3. Purpose of a cross-dock in the distribution network
common in retail distribution, Incoming truckloads from a few distribution centers are split into delivery loads for a large number of retail stores,
originated from opportunistic cross-docking, i.e., products by- passed the storage facilities at distribution centers only if the opportunity occurred.
less-than-truckload and parcel delivery industries.
Cross-dock design
The main aims are to enable rapid transshipment and provide sufficient capacity to meet freight throughput requirements.
Cross-dock planning
A typical objective used by cross-dock managers is to minimize the material handling effort required for moving incoming freight from strip to stack doors.
determining the appropriate workforce and material handling equipment to efficiently handle all freight within the limited time
Cross-dock scheduling
specify the allocation of resources at the cross-dock over time
decisions for serving individual trailers at the cross-dock are aimed at facilitating a smooth flow of freight from the strip to the stack doors.
Network design
determine the physical infrastructure of the cross-docking network such that transportation demand is met at the lowest possible cost.
concerned with shaping the general structure of the network and defining the types of logistics facilities that are established.
Network planning
allocating and utilizing network-wide logistics resources in order to attain economic and customer service level objectives.
assign a destination to each shipment is then part of the network planning.
Network scheduling
considers detailed temporal constraints in routing freight
concerned with dispatching shipments.
specifying if and how many shipments are dispatched onto a given transport service.
geared towards identifying and understanding the strong hierarchical and lateral inter dependencies among the cross-docking problem classes
Sample selection & classification procedure
conducted a search to identify all international journal papers before 2014 and limited our selection
descriptive and normative - to evaluate the benefits of employing a cross-docking strategy or compare different types
Local cross-dock management
Cross-dock design
Cross-dock planning
Cross-dock coordination
Cross-dock scheduling
cross- dock shapes considered are I, L, T, H and X. Each shape is evaluated according to its associated labor costs,
considerably limit the search space of the dock door assignment problem by assuming stack and strip doors are readily specified on opposite sides of the cross-dock
minimize the internal travel distance of material handling equipment and the waiting time of inbound trailers.
aimed at solving trailer-scheduling problems, focused on minimizing the length of the planning horizon. indicate that the total distance traveled and the congestions that appear on-route between dock doors
Cross-docking network management
Specifically aimed at simultaneously solving local cross-dock and network-wide decision problems
Network design >> aimed at determining the best cross-dock locations
Network planning >> proposed model allows freight to be routed either directly or intermediately pass through one of the cross-docks in the network.
Network coordination >> cannot be accomplished within the given time window constraints, Response by extends it by considering also soft time constraints.
Network scheduling >> problem in a setting with centralized net-work coordination, consists of multiple subsystems and each cross-dock operator coordinates the transport services in his own subsystem.
Synchronization
requires local and network-wide operations to be synchronized
corresponding inter dependencies between cross-docking problem classes may occur at the strategic, tactical, and operational level.
Research classification
Shows two potential areas
At the

strategic decision
-making level, problems include both local cross-dock design aspects and cross-docking net- work design aspects.
At
the tactical and operational level
, problems include a combination of coordination problem aspects for the purpose of synchronizing network-wide and local cross-dock operations.
The framework is shown in Fig5
purpose is to support future cross-docking research in acknowledging
Several promising research opportunities reside in addressing these inter dependencies. At a strategic or tactical decision-making level, it may suffice to focus on local or network-wide decision problems.

local cross-dock focus should carefully consider cross-docking network characteristics. Similarly, network oriented cross-docking studies should consider local cross-dock characteristics in detail
The absence of a storage buffer inside a cross-dock translates into tightly coupled local and network-wide cross-docking operations. The research shows that the overwhelming majority of papers address isolated cross- docking problems. Accordingly, a framework is presented to support future research in developing decision models for cross-docking synchronization problems with practical and scientific relevance.
the research classification shows that the overwhelming majority of papers address isolated cross- docking problems. Accordingly, a framework is presented to support future research in developing decision models for cross-docking synchronization problems with practical and scientific relevance.
The problem classes are based on their decision-making level such as strategic, tactical and operational Whether they address decision problems originating locally at the cross-dock. Our research classification resulted in an understanding about the information needs for each problem class. The framework, specifying the interdependencies between the six cross-docking problem classes, is developed based on this understanding
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