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Transcript of Ivanov 2015
ScienceDirectIFAC-PapersOnLine 48-3 (2015) 1700–1707
Available online at www.sciencedirect.com
2405-8963 © 2015, IFAC (International Federation of Automatic Control) Hosting by Elsevier Ltd. All rights reserved.Peer review under responsibility of International Federation of Automatic Control.10.1016/j.ifacol.2015.06.331
Dmitry Ivanov et al. / IFAC-PapersOnLine 48-3 (2015) 1700–1707
© 2015, IFAC (International Federation of Automatic Control) Hosting by Elsevier Ltd. All rights reserved.
Supply Chain Design With Disruption Considerations:
Review of Research Streams on the Ripple Effect in the Supply Chain
Dmitry Ivanov1, Alexandre Dolgui
2, Boris Sokolov
3,4
1Berlin School of Economics and Law, Department of Business Administration
Chair of International Supply Chain Management, 10825 Berlin, Germany
Phone: +49 3085789155; E-Mail: [email protected] 2Ecole Nationale Supérieure des Mines, UMR CNRS 6158, LIMOS,
158, Cours Fauriel, 42023 Saint-Etienne cedex 2, France E-Mail: [email protected] 3St. Petersburg Institute for Informatics and Automation of the RAS (SPIIRAS)
V.O. 14 line, 39 199178 St. Petersburg, Russia; E-Mail: [email protected] 4University ITMO, St. Petersburg, Russia; E-Mail: [email protected]
Abstract: This study aims at analysing recent research on supply chain design with disruption considera-
tions in terms of the ripple effect in the supply chain. It develops different dimensions of the ripple-effect
and summarizes recent developments in the field of supply chain disruption management from a multi-
disciplinary perspective. We observe that the analysis of how to achieve planned economic performance in
a real-time, uncertain and perturbed execution environment is a vital and up-to-date issue in many supply
chains. Te ripple effect can be the phenomenon that is able to consolidate research in supply chain
tion management and recovery similar to the bullwhip effect regarding demand and lead time fluctuations.
This may build the agenda for future research on supply chain dynamics, control, continuity, and disrup-
tion management, making supply chains more robust, adaptable, and profitable. Copyright © 2015 IFAC
Keywords: supply chain, ripple effect, dynamics, control, resilience, robustness, disruption management,
event management, quantitative analysis, information technology.
1. INTRODUCTION
Supply chain design (SCD) has been a visible and influential
topic in the field of production, operations, and supply chain
management (SCM) over the past two decades. A large num-
ber of approaches have been proposed for the design of sup-
ply chains (SC) (Drezner 1995, Daskin 1995, Amiri 2006,
Melo et al. 2009, Georgiadis et al. 2011, Constantino et al.
2012). Typically, cost or service level optimization has been
included in the objective functions. In many cases, inventory,
lead-time, and demand fluctuations have been integrated into
those models (Sourirajan et al., 2009, Sadjady and Davoud-
pour 2012, Kumar and Tiwari 2013, Askin et al. 2014).
The risks of demand and supply uncertainty are related to the
random uncertainty and business-as-usual situation. Such
risks are also known as recurrent or operational risks (Cho-
pra et al. 2007, Wilson 2007, Singh et al. 2012). SC managers
achieved significant improvements at managing the SCs and
mitigating recurrent SC in risks through improved planning
and execution (Chopra and Sodhi 2014). Disruptive risks
represent now a new challenge for SC managers who face the
ripple effect that arises from vulnerability, instability, and
disruptions in SCs (Ivanov et al. 2014a).
The ripple effect describes the impact of a disruption on SC
performance and disruption-based scope of changes in the SC
structures and parameters (Ivanov et al. 2014a). Following a
disruption, its effect ripples through the SC. The scope of the
rippling and its impact on economic performance depends
both on robustness reserves (e.g., redundancies like inventory
or capacity buffers) and speed and scale of recovery measures
(Sheffi and Rice 2005, Tomlin 2006, Bode et al. 2011,
Ivanov and Sokolov 2013, Kim and Tomlin, 2013). Since the
research community distinguishes between operational and
disruption risks, the ripple-effect can be considered for dis-
ruption risks while for operational risks the bullwhip-effect is
typically studies. The differences are presented in Table 1.
Table 1: Ripple effect and bullwhip effect
Feature Ripple-Effect Bullwhip-Effect
Risks Disruptions (e.g., a plant
explosion)
Operational (e.g., de-
mand fluctuation)
Affected
areas
Structures and critical
parameters (like lead-time
and inventory)
Critical parameters like
lost sales
Recov-
ery
Middle- and long-term;
coordination efforts and
investments
Short-term coordination
to balance demand and
supply
Affected
Perfor-
mance
Output performance like
annual revenues
Current performance
like daily stock-
out/overage costs
Proceedigs of the 15th IFAC Symposium onInformation Control Problems in ManufacturingMay 11-13, 2015. Ottawa, Canada
Copyright © 2015 IFAC 1770
Supply Chain Design With Disruption Considerations:
Review of Research Streams on the Ripple Effect in the Supply Chain
Dmitry Ivanov1, Alexandre Dolgui
2, Boris Sokolov
3,4
1Berlin School of Economics and Law, Department of Business Administration
Chair of International Supply Chain Management, 10825 Berlin, Germany
Phone: +49 3085789155; E-Mail: [email protected] 2Ecole Nationale Supérieure des Mines, UMR CNRS 6158, LIMOS,
158, Cours Fauriel, 42023 Saint-Etienne cedex 2, France E-Mail: [email protected] 3St. Petersburg Institute for Informatics and Automation of the RAS (SPIIRAS)
V.O. 14 line, 39 199178 St. Petersburg, Russia; E-Mail: [email protected] 4University ITMO, St. Petersburg, Russia; E-Mail: [email protected]
Abstract: This study aims at analysing recent research on supply chain design with disruption considera-
tions in terms of the ripple effect in the supply chain. It develops different dimensions of the ripple-effect
and summarizes recent developments in the field of supply chain disruption management from a multi-
disciplinary perspective. We observe that the analysis of how to achieve planned economic performance in
a real-time, uncertain and perturbed execution environment is a vital and up-to-date issue in many supply
chains. Te ripple effect can be the phenomenon that is able to consolidate research in supply chain
tion management and recovery similar to the bullwhip effect regarding demand and lead time fluctuations.
This may build the agenda for future research on supply chain dynamics, control, continuity, and disrup-
tion management, making supply chains more robust, adaptable, and profitable. Copyright © 2015 IFAC
Keywords: supply chain, ripple effect, dynamics, control, resilience, robustness, disruption management,
event management, quantitative analysis, information technology.
1. INTRODUCTION
Supply chain design (SCD) has been a visible and influential
topic in the field of production, operations, and supply chain
management (SCM) over the past two decades. A large num-
ber of approaches have been proposed for the design of sup-
ply chains (SC) (Drezner 1995, Daskin 1995, Amiri 2006,
Melo et al. 2009, Georgiadis et al. 2011, Constantino et al.
2012). Typically, cost or service level optimization has been
included in the objective functions. In many cases, inventory,
lead-time, and demand fluctuations have been integrated into
those models (Sourirajan et al., 2009, Sadjady and Davoud-
pour 2012, Kumar and Tiwari 2013, Askin et al. 2014).
The risks of demand and supply uncertainty are related to the
random uncertainty and business-as-usual situation. Such
risks are also known as recurrent or operational risks (Cho-
pra et al. 2007, Wilson 2007, Singh et al. 2012). SC managers
achieved significant improvements at managing the SCs and
mitigating recurrent SC in risks through improved planning
and execution (Chopra and Sodhi 2014). Disruptive risks
represent now a new challenge for SC managers who face the
ripple effect that arises from vulnerability, instability, and
disruptions in SCs (Ivanov et al. 2014a).
The ripple effect describes the impact of a disruption on SC
performance and disruption-based scope of changes in the SC
structures and parameters (Ivanov et al. 2014a). Following a
disruption, its effect ripples through the SC. The scope of the
rippling and its impact on economic performance depends
both on robustness reserves (e.g., redundancies like inventory
or capacity buffers) and speed and scale of recovery measures
(Sheffi and Rice 2005, Tomlin 2006, Bode et al. 2011,
Ivanov and Sokolov 2013, Kim and Tomlin, 2013). Since the
research community distinguishes between operational and
disruption risks, the ripple-effect can be considered for dis-
ruption risks while for operational risks the bullwhip-effect is
typically studies. The differences are presented in Table 1.
Table 1: Ripple effect and bullwhip effect
Feature Ripple-Effect Bullwhip-Effect
Risks Disruptions (e.g., a plant
explosion)
Operational (e.g., de-
mand fluctuation)
Affected
areas
Structures and critical
parameters (like lead-time
and inventory)
Critical parameters like
lost sales
Recov-
ery
Middle- and long-term;
coordination efforts and
investments
Short-term coordination
to balance demand and
supply
Affected
Perfor-
mance
Output performance like
annual revenues
Current performance
like daily stock-
out/overage costs
Proceedigs of the 15th IFAC Symposium onInformation Control Problems in ManufacturingMay 11-13, 2015. Ottawa, Canada
Copyright © 2015 IFAC 1770
Supply Chain Design With Disruption Considerations:
Review of Research Streams on the Ripple Effect in the Supply Chain
Dmitry Ivanov1, Alexandre Dolgui
2, Boris Sokolov
3,4
1Berlin School of Economics and Law, Department of Business Administration
Chair of International Supply Chain Management, 10825 Berlin, Germany
Phone: +49 3085789155; E-Mail: [email protected] 2Ecole Nationale Supérieure des Mines, UMR CNRS 6158, LIMOS,
158, Cours Fauriel, 42023 Saint-Etienne cedex 2, France E-Mail: [email protected] 3St. Petersburg Institute for Informatics and Automation of the RAS (SPIIRAS)
V.O. 14 line, 39 199178 St. Petersburg, Russia; E-Mail: [email protected] 4University ITMO, St. Petersburg, Russia; E-Mail: [email protected]
Abstract: This study aims at analysing recent research on supply chain design with disruption considera-
tions in terms of the ripple effect in the supply chain. It develops different dimensions of the ripple-effect
and summarizes recent developments in the field of supply chain disruption management from a multi-
disciplinary perspective. We observe that the analysis of how to achieve planned economic performance in
a real-time, uncertain and perturbed execution environment is a vital and up-to-date issue in many supply
chains. Te ripple effect can be the phenomenon that is able to consolidate research in supply chain
tion management and recovery similar to the bullwhip effect regarding demand and lead time fluctuations.
This may build the agenda for future research on supply chain dynamics, control, continuity, and disrup-
tion management, making supply chains more robust, adaptable, and profitable. Copyright © 2015 IFAC
Keywords: supply chain, ripple effect, dynamics, control, resilience, robustness, disruption management,
event management, quantitative analysis, information technology.
1. INTRODUCTION
Supply chain design (SCD) has been a visible and influential
topic in the field of production, operations, and supply chain
management (SCM) over the past two decades. A large num-
ber of approaches have been proposed for the design of sup-
ply chains (SC) (Drezner 1995, Daskin 1995, Amiri 2006,
Melo et al. 2009, Georgiadis et al. 2011, Constantino et al.
2012). Typically, cost or service level optimization has been
included in the objective functions. In many cases, inventory,
lead-time, and demand fluctuations have been integrated into
those models (Sourirajan et al., 2009, Sadjady and Davoud-
pour 2012, Kumar and Tiwari 2013, Askin et al. 2014).
The risks of demand and supply uncertainty are related to the
random uncertainty and business-as-usual situation. Such
risks are also known as recurrent or operational risks (Cho-
pra et al. 2007, Wilson 2007, Singh et al. 2012). SC managers
achieved significant improvements at managing the SCs and
mitigating recurrent SC in risks through improved planning
and execution (Chopra and Sodhi 2014). Disruptive risks
represent now a new challenge for SC managers who face the
ripple effect that arises from vulnerability, instability, and
disruptions in SCs (Ivanov et al. 2014a).
The ripple effect describes the impact of a disruption on SC
performance and disruption-based scope of changes in the SC
structures and parameters (Ivanov et al. 2014a). Following a
disruption, its effect ripples through the SC. The scope of the
rippling and its impact on economic performance depends
both on robustness reserves (e.g., redundancies like inventory
or capacity buffers) and speed and scale of recovery measures
(Sheffi and Rice 2005, Tomlin 2006, Bode et al. 2011,
Ivanov and Sokolov 2013, Kim and Tomlin, 2013). Since the
research community distinguishes between operational and
disruption risks, the ripple-effect can be considered for dis-
ruption risks while for operational risks the bullwhip-effect is
typically studies. The differences are presented in Table 1.
Table 1: Ripple effect and bullwhip effect
Feature Ripple-Effect Bullwhip-Effect
Risks Disruptions (e.g., a plant
explosion)
Operational (e.g., de-
mand fluctuation)
Affected
areas
Structures and critical
parameters (like lead-time
and inventory)
Critical parameters like
lost sales
Recov-
ery
Middle- and long-term;
coordination efforts and
investments
Short-term coordination
to balance demand and
supply
Affected
Perfor-
mance
Output performance like
annual revenues
Current performance
like daily stock-
out/overage costs
Proceedigs of the 15th IFAC Symposium onInformation Control Problems in ManufacturingMay 11-13, 2015. Ottawa, Canada
Copyright © 2015 IFAC 1770
Dmitry Ivanov et al. / IFAC-PapersOnLine 48-3 (2015) 1700–1707 1701
At the design stage (the so called proactive stage), contin-
gency plans or backup planning (e.g., alternative suppliers or
shipping routes) are developed (Knemeyer et al. 2009, Cui et
al. 2010, Benyoucef et al. 2013, Li et al. 2013). During the
execution (the so called reactive stage), the recovery must
happen quickly to expedite stabilization and adaptation in
order to ensure SC continuity and avoid long-term impact
(Sheffi and Rice 2005, Simchi-Levi et al. 2014, Chopra and
Sodhi 2014).
In this setting, it is vital to extend existing SCD models by
integrating objectives like flexibility, robustness, stability,
resilience into multi-criteria SCD selection procedures
(Snyder and Daskin 2005, Wilson 2007, Klibi et al. 2010,
Peng et al. 2011, Baghalian et al. 2013). Such research can
provide professionals with useful tools to analyse perfor-
mance and resilience of SCs simultaneously.
2. STATE-OF-THE-ART
2.1 Pro-active approach
Studies by Snyder and Daskin (2005), Wilson (2007), Qi and
Chen (2010), Cui et al. (2010), Klibi et al. (2010), Schmitt
and Singh (2012), Lim et al. (2010, 2013), Peng et al. (2011),
Li et al. (2013), Ivanov and Sokolov (2013), Kim and Tomlin
(2013), and Ivanov et al. (2014a) indicated that understanding
and finding SCD with effective and efficient constellations of
economic performance, complexity, robustness, flexibility,
adaptability and resilience is a promising research area with
high practical applicability.
2.1.1 Mixed-integer programming
Mixed-integer programming (MIP) with application to relia-
ble SCD has been a broad research avenue over the past ten
years. More precisely, incapacitated fixed charge location
model – UFL and P-median problem have been mostly stu-
died. The reliable location model was first introduced by
Snyder and Daskin (2005). UFL model aims at finding op-
timal SCD with assignments of the customers to the locations
with the objective to minimize the sum of fixed and transpor-
tation costs in the SC. The study by Snyder and Daskin
(2005) assumed equal estimations of probability failures for
all the SC nodes and considered a case with 49 cities in U.S.
This model has been extended by Shen et al. (2009) and Cui
et al. (2010) by relaxing the assumption on homogenous fail-
ure probability. In addition, Cui et al. (2010) paid attention to
the fact that total transportation costs in the SC should not
increase after a disruption. They model provides the solution
without an increase in transportation costs for both normal
and disruptive modes. For medium-size problems, as docu-
mented in Li et al. (2013) Lagrangian relaxation also allows
finding optimal solution in reasonable time.
Next development of MIP models in the ripple-effect context
can be considered regarding the facility fortification. Lim et
al. (2010) incorporated a totally reliable bаck-up supplier that
is used if a primary supplier is destroyed. The related costs
are incorporated into the objective function but the fortifica-
tion budget remained incapacitated. Li et al. (2013) extended
this model by introducing the limits on the fortification budg-
et in a single-product case with eight distributors and up to
150 customers.
In addition, inventory considerations have also been included.
Chen et al. (2011) presented a joint inventory-location model
under the risk of probabilistic facility disruptions. Benyoucef
et al. (2013) considers SCD with unreliable suppliers. The
objective is to minimise fixed location costs, inventory and
safety stock costs at the distribution centres and ordering
costs and transportation costs across the network. The non-
linear MIP model is solved with the help of Lagrangian re-
laxation. Inventory management under SC disruption in-
volves nonlinear cost components. Therefore heuristic solu-
tion methods are typically used. In addition, lead-time uncer-
tainty constraints may be included into consideration (Mo-
hebbi et al. 2003, Aсar et al., 2010).
Rafiei et al. (2013) developed a comprehensive model for a
problem statement with multiple products and many periods.
They consider the levels of inventory, back-ordering, the
available machine capacity and labor levels for each source,
transportation capacity at each transshipment node and avail-
able warehouse space at each destination. The problem also
considers the facility fortification by taking into account
backup supplier with reserved capacity and backup trans-
shipment node that satisfies demands at higher price without
disruption facility. The solution to the model is based on a
priority-based genetic algorithm.
2.1.2 Stochastic programming
It is to distinguish between classical stochastic programming
models (Tsiakis et al. 2001, Santoso 2005, Goh et al. 2007)
where demand is uncertain parameter and robust stochastic
programming models (Azaron et al. 2008) where also facility
disruptions and capacity expansion costs are considered to be
uncertain. Recently, Schütz et al. (2009), Iakovou et al.
(2010), Li and Wang (2011), and Baghalian et al. (2013) ex-
tended the existing models by considering demand-side and
supply-side uncertainties simultaneously.
Benyoucef et al. (2013) considers two-period SCD model in
which selected suppliers are reliable in the first period and
can fail in the second period. The corresponding facility loca-
tion/supplier reliability problem is formulated as a non-linear
stochastic programming problem. The authors use Monte
Carlo optimisation approach in combination with the Lagran-
gian relaxation. Sawik (2013) developed a stochastic pro-
gramming model to integrated supplier selection, order quan-
tity allocation and customer order scheduling in the presence
of SC disruption risks.
2.1.3 Fuzzy, robust, and goal optimization
The study by Petrovic et al. (1998) was among first papers on
fuzzy optimization application to SCD with the uncertainty of
demands and external supply. The objective was to determine
the stock levels and order quantities to obtain an acceptable
delivery performance at a reasonable total cost for the SC.
Aliev et al. (2007) applied fuzzy mathematical programming
with a fuzzy objective function solved by genetic algorithm.
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Similar to Petrovic et al. (1998), this study considered cus-
tomer demand and production capacity as uncertainties. The
objective was to provide a sound trade-off between maximi-
zation of profit and service level. Constantino et al. (2011)
presented a fuzzy programming approach for the strategic
design of distribution networks.
Gulpınar et al. (2012) formulates a stochastic model for mul-
tiple capacitated facilities that serve customers with a single
product, and a stockout probabilistic requirement as a chance
constraint. Based on robust optimization, they present numer-
ical experiments to illustrate the performance of the different
robust formulations. Pishvaee et al. (2012) presented a robust
possibilistic programming approach to socially responsible
SCD.
2.1.5 Simulation, system science and control theory
Simulation approaches have been proved to be a suitable tool
for analysis of SCD in terms of the ripple effect. Wu et al.
(2007) presented a Petri net-based modeling approach to
model how disruptions propagate through a SC and evaluate
the impact of the disruption on the SC performance. Another
application of Petri net-based simulation to SCs is presented
by Tuncel and Alpan (2010) in order to evaluate the impact
of multiple disruption scenarios (disruptions in demand,
transportation and quality) and possible mitigation actions on
the SC performance.
Monte Carlo approach based on a generalized semi-Markov
process is taken to assess the disruptions caused by a specific
type of hazard on an SC (Deleris and Erhun, 2011). This
model estimates the probability distribution of the loss in the
SC output caused by the occurrence of hazards within the SC.
Zegordi and Davarzani (2012) present an SC disruption anal-
ysis model based on colored Petri nets for better visual repre-
sentation.
Lewis et al. (2013) analyse the disruptions risks at ports-of-
entry with the help of closure likelihood and duration which
are modeled using a completely observed, exogenous Markov
chain. They developed a periodic-review inventory control
model that indicates for studied scenarios that operating mar-
gins may decrease 10% for reasonable-length port-of-entry
closures or eliminated completely without contingency plans,
and that expected holding and penalty costs may increase
20% for anticipated increases in port-of-entry utilization.
Swaminathan et al. (1998) and Surana et al. (2005) applied
agent systems and adaptive principles to SC dynamics analy-
sis. Kamath and Roy (2007) analysed capacity augmentation
decisions for products with short life-cycles and unpredicta-
bly high demand with the help of the system dynamics ap-
proach. Xu et al. (2014) used AnyLogic software and mod-
elled SC as an agent system to study the disruption at suppli-
ers and recovery policies on SC service level.
Schönlein et al. (2013) apply stability analysis based on mul-
ticlass queuing network. The authors study different destabi-
lization inputs and formulate a mathematical program that
minimizes the required network capacity, while ensuring a
desired level of robustness.
To study the impact of transportation disruptions on SC per-
formance, Ivanov et al. (2010) developed a structure dynam-
ics control approach to SCD with the simultaneous considera-
tion of multiple SC structures (i.e., material, information,
product, technology, and finance) and their dynamics. They
presented solution methods based on a combination of optim-
al control and mathematical programming.
Teimoury and Fathi (2013) along with Zhou et al. (2013)
faced the issues of SC resilience through flexibility increase
and applied queuing models to analyse the impacts of post-
ponement on SC performance. Meisel and Bierwirth (2014)
also applied simulation and optimization method to analyse
performance of a make-to-order strategy in presence of un-
certainties.
Recently Ivanov et al. (2013) and (2014b) developed a model
for multi-period and multi-commodity SCD with structure
dynamics considerations. The original idea of these studies is
SC description as a non-stationary dynamic control system
along with a linear programming (LP) model. In contrast to
MIP formulation, they distribute static and dynamic parame-
ters between the LP and control models.
2.2. Re-active approach
Investment in SC protection can help to avoid many prob-
lems with disruptive events. However, it is impossible to
avoid disruption. Therefore, adaptation is needed to change
SC plans, schedules or inventory policies in order to achieve
the desired output performance (Ivanov and Sokolov, 2013).
Modelling SCs and operations using system dynamics and
control theory using differential equations holds great appeal
for the scientific community (Riddals et al. 2000, Sarimveis
et al. 2008, Ivanov et al. 2012, Harjunkoski et al. 2014). This
is because many of the influential characteristics of the prob-
lem can be succinctly expressed in dynamic form. Then, a
vast array of tools and methodologies can be invoked to gain
insight into the system dynamics. Dynamic methods also
have the advantage of being conduits into the adapta-
tion/recovery domain.
Wilson (2007) presented a system dynamics model for a mul-
ti-stage SC. Different transportation disruptions are modeled
and their impact on customer orders fulfillment rate and in-
ventory fluctuations are evaluated. The greatest impact oc-
curs when transportation is disrupted between the Tier-1 sup-
plier and the warehouse.
Schmitt and Singh (2012) presented a quantitative estimation
of the disruption risk in a multi-echelon SC using simulation.
The disruption risk is measured by “weeks of recovery” as
the amplification of the disruption. Carvalho et al. (2012)
analysed impacts of disruptions on lead-time and overall SC
costs using ARENA-based simulation model.
Bensoussan et al. (2007) considered disruptions in informa-
tion structure as possible information delay and incomplete-
ness in the ordering policies for inventory decisions with the
help of linear control theory. Hwarng and Xie (2008) ana-
lysed SC dynamics from chaos theory perspective. Schmitt
(2011) modelled strategies that include satisfying demand
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from an alternate location in the network; procuring material
or transportation from an alternative source or route; and
holding strategic inventory reserves throughout the network.
The very extensive area of research on SC adaptation is mod-
el predictive control (MPC) (Wang et al., 2007). In MPC, a
system model and current and historical measurements of the
process are used to predict system behaviour at future pre-
determined times. A control-relevant objective function is
then optimized to calculate a control sequence that must satis-
fy the system constraints.
Applications of MPC to multi-echelon production–inventory
problems and SCs have been examined previously in the lite-
rature. Perea et al. (2000) modelled multi-plant, multi-
product polymer processes through difference equations, and
schedule optimization in an MPC framework. Braun et al.
(2003) developed a decentralized MPC implementation for a
six-node, two-product, and three-echelon demand network
problem. In the study by Puigjaner and Lainez (2008), a mul-
ti-stage stochastic model has been employed. Mastragostino
et al. (2014) analysed SC performance in the presence of un-
certainty in the model parameter and demand considering
service level in the SC.
Apart from control approaches, other techniques have also
been applied in this domain. Unnikrishnan and Figliozzi
(2011) developed a scenario-based model with an adaptive
routing policy. Vahdani et al. (2011) applied fuzzy program
evaluation and review technique to calculate the completion
time of SC operations in the case of a severe disruption. Shao
and Dong (2012) considered supply disruption and reactive
strategies in an assemble-to-order SC with time-sensitive
demand. Ivanov et al. (2013) included transportation reconfi-
guration in the case of SC disruptions into the SCD in a mul-
ti-period model based on a combination of LP and optimal
control. Xu et al. (2014) developed an approach to predict SC
resilience by including recovery measures that uses the anal-
ogy to biological cells with the abilities to self-adaptation and
self-recovery. Paul et al. (2014) analysed series of disruptions
over time and presented an inventory control-based model to
develop optimal recovery policies real time disruption man-
agement for a two-stage batch production–inventory system
with reliability considerations. They consider multiple dis-
ruptions and cases where new disruption may or may not
affect the recovery plan of earlier disruptions.
3. ANALYIS AND OBSERVATIONS
3.1. Types of risks
The analysed literature suggests four basic types of disruptive
risks that should be considered by SC managers:
• Production and transportation disruptions, especially
in global SCs
• Product-related disruption risks due to high degree
of supplier specialization
• Information flow disruptions
• Disruptions in financial flows
First, globalization and outsourcing trends make SC more
complex and less observable and controllable. According to
complexity theory, such systems become more sensitive to
disruptions. Special focus in this area is directed to disrup-
tions in transportation channels. Second, the efficiency para-
digms of lean processes, single sourcing, etc. have failed in
disruption situations. As a consequence, SC became more
vulnerable even to minor perturbations. Any disruption in a
global SC, especially in its supply base, does immediately
affect the entire SC. Third, with the increased specialization
and geographical concentration of manufacturing, disruptions
in one or several nodes affect almost all the nodes and links
in the SC. Fourth, IT became the crucial element of global
SCs, since disruptions in IT may have significant impacts on
disruptions in material flows (Soroor et al. 2009, Tang and
Musa 2011). Fifth, contracting, costs, and profit coordination
issues are important for analyzing disruptive risks in the SCs.
3.2 Pro-active SC protection
Next, recent literature discussed different risk mitigation
strategies. Six elements of pro-active SC protection can be
classified:
• Back-up suppliers, depots and transportation channels
• Inventory and capacity buffers
• SC localization and segmentation
• Product and process flexibility
• Coordination and contracting
• Back-up IT
3.3 Re-active SC recovery policies
Reaction to disruptive events can be performed in five basic
ways depending on the severity of disruptions:
• Parametrical adaptation
• Process and product adaptation
• Structure adaptation
• System adaptation
Parametrical adaptation represents the simplest case where
stabilization and recovery are possible through tuning of
some critical parameters like lead-time or inventory. Process
and product adaptation refer to flexibility reserves. Structure
adaptation considers back-up supplier on contingency trans-
portation plans. System adaption is the highest level of adap-
tation where strategy and organization have to be recovered.
Re-active approaches can be based either on purely recovery
policies without any SC pro-active protection or integrated in
or with the pro-active approaches. We focus on the second
case. Many pro-active techniques actually include the re-
active elements. MIP formulations with facility fortification
consider product shift to back-up suppliers if primary suppli-
ers are disrupted. MPC models implement rolling planning
policy and include the re-planning elements explicitly. Inven-
tory control models also suggest policies for recovery. Simu-
lation techniques consider “what-if” scenarios which can be
used by SC managers in the case of disruption occurrence to
quickly estimate the recovery policies and impacts on opera-
tional and financial performance.
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3.4. Method overview
MIP models provide interesting managerial insights and can
be successfully used in the cases where disruption probabili-
ties can be fairly estimated. Second, most of the MIP solu-
tions suggest opening new facilities. That increases total costs
even if transportation costs are not increased.
However, as pointed out in recent articles by Chopra and
Sodhi (2014) and Simchi-Levi et al. (2014) it is almost im-
possible to determine probability of factory fires, natural dis-
asters, or piracy in a certain region. That is why one has to
concentrate mostly on mitigation strategies and identification
of the impact of disruption on financial and operational per-
formance regardless of what caused the disruption.
In addition, a general shortcoming of the existing studies, as
pointed out by Cui et al. (2010) and Li et al. (2013) is that the
dynamics of the SC execution is not considered. The disrup-
tions are mostly considered as static events, without taking
into account their duration, stabilization/ recovery policies.
Similar to MIP, the assumptions on known reliability of the
suppliers and parametric probabilities make the stochastic
programming models generally difficult to handle and im-
plement. In addition, scenario-based approach exponentially
increases the number of variables and constraints in stochas-
tic formulations. For some practical challenges and solutions
in this direction, we refer to van Delft and Vial (2004).
Generally the application of fuzzy and robust optimization is
related mostly to operational risks (e.g., demand fluctuations)
and tactical planning level with some episodical interfaces to
SCD. The same can be stated for MPC models. In addition,
as general shortcoming of robust optimization, the tendency
to quite pessimistic solution has to be named. In practice, it is
hardly to assume that managers will accept SCDs with low
efficiency and high fixed-costs just in the anticipation of the
worst-case.
Summarizing, management science and operations research
along with system dynamics and control theory contain a
number of useful methods that can be used for analysis and
for mitigating the ripple effect. Different methods are suited
to different problems. No single technique is likely to prove a
panacea in this field. While mathematical and stochastic op-
timization have their place at the strategic and tactical level at
SC design and planning stages, they fail to throw much light
on the dynamic behaviour of the SC as a whole. The implica-
tions of strategic SC design and tactical plans on SC perfor-
mance at the execution and recovery stage can be enhanced
by using models based on the dynamics of the execution
processes.
The research described in this paper is partially supported by
the Russian Foundation for Basic Research (grants 13-07-
00279, 13-08-00702, 13-08-01250, 13-06-00877, 13-07-
12120-офи-м, 15-29-01294-ofi-m, 15-07-08391, 15-08-
08459), grant 074-U01 supported by Government of Russian
Federation), Program “5-100-2020” supported by Govern-
ment of Russian Federation, Department of nanotechnologies
and information technologies of the RAS (project 2.11), by
ESTLATRUS projects 1.2./ELRI-121/2011/13 «Baltic ICT
Platform» and 2.1/ELRI-184/2011/14 «Integrated Intelligent
Platform for Monitoring the Cross-Border Natural-
Technological Systems»
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