Abstract
Industrial 4.0 (I4.0) is believed to revolutionize supply chain (SC) management and the articles in this domain have experienced remarkable increments in recent years. However, the existing insights are scattered over different sub-topics and most of the existing review papers have ignored the underground decision-making process using OR methods. This paper aims to depict the current state of the art of the articles on SC optimization in I4.0 and identify the frontiers and limitations as well as the promising research avenue in this arena. In this study, the systematic literature review methodology combined with the content analysis is adopted to survey the literature between 2013 and 2022. It contributes to the literature by identifying the four OR innovations to typify the recent advances in SC optimization: new modeling conditions, new inputs, new decisions, and new algorithms. Furthermore, we recommend four promising research avenues in this interplay: (1) incorporating new decisions relevant to data-enabled SC decisions, (2) developing data-enabled modeling approaches, (3) preprocessing parameters, and (4) developing data-enabled algorithms. Scholars can take this investigation as a means to ignite collaborative research that tackles the emerging problems in business, whereas practitioners can glean a better understanding of how to employ their OR experts to support digital SC decision-making.
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1 Introduction
Over the last decades, supply chain (SC) management has been driven by the boom of industrial 4.0 (I4.0) toward a more efficient and greener system. The notion of I4.0 was initially coined by the German economic development agency to represent the emerging information and communication technologies that connect the physical and digital domains in industry (Olsen & Tomlin, 2020). Individually and collectively, this concept encompasses a set of future industrial developments regarding the Internet of Things (IoT), cyber physical systems (CPS), artificial intelligence (AI), machine learning (ML), data mining (DM), cloud computing (CC), blockchain, and big data (BD) analytics. The SC in I4.0 is also labeled as a smart system ( Zhang et al., 2022a, 2022b) or a digital system (Agrawal et al., 2023; Seyedghorban et al., 2020). Although different notions have been used to label the SC in I4.0, two streams of underlying data technologies are worth noting. The first group is relevant to data generation, such as sensors and Radio Frequency Identification (RFID), while the second group is data analytical techniques, such as AI and ML. For SC management, I4.0 builds a data-enriched environment and offers the possibility of cost reduction, flexibility enhancement, and delivery improvement as well as the opportunity to alleviate the inherent tensions between these pivotal operational priorities (Nayernia et al., 2022; Taddei et al., 2022).
The increasing significance of the data to organizational success has stimulated the SC community to explore data-intensive SC optimization (Liu et al., 2021; Nguyen et al., 2022a, 2022b). I4.0 also creates unprecedented modeling challenges for traditional Operation Research (OR) methodologies (Gupta et al., 2022; Hazen et al., 2018; Jabbour et al., 2020). Although the articles in this domain have experienced remarkable increments in recent years, the existing insights are scattered over different literature sources and there is a lack of a structured and unbiased review methodology to systematize the OR methods for SC optimization in I4.0. A comprehensive analysis of noteworthy contributions made in the SC optimization domain can build better OR methods and refine the underlying theories in I4.0.
This paper aims to depict the state-of-art articles on SC optimization in I4.0 and identify the frontiers and limitations as well as the promising research avenue in this interplay. In this study, the systematic literature review (SLR) methodology integrated with the content analysis is adopted to survey the literature on the topic of SC optimization and explore the OR innovations in the context of I4.0 to realize the following: (1) The I4.0 technologies that can be implemented for SC optimization; (2) The SC decisions that can be optimized in I4.0; (3) Establishing the OR methods to address the SC optimization in I4.0; (4) The current challenges for SC optimization while implementing I4.0, and the future directions to be taken in terms of innovations in OR methodology.
To the best of our knowledge, it is among the first efforts to review the present status of the articles on SC optimization in I4.0 from an OR perspective. The linkage between the OR methods and the I4.0 technologies established in this review provides valuable insights to the academic community and industry in exploiting SC optimization at different decision levels.
The rest of the paper proceeds as follows. Section 2 analyzed the previous reviews in this area and identified the research gaps. The research methodology is presented in Sect. 3. The statistical observations are presented in Sect. 4. The review findings are presented in Sect. 5. Section 6 summarizes the gaps and future research needs. Finally, in Sect. 7, we present our conclusions as well as the main contributions. The abbreviations used in this study are presented in Appendix 1.
2 Previous reviews and research gaps
A set of literature reviews on I4.0 technologies and SC has been conducted by scholars. In order to clarify the need for this study, the OR methodologies, Industrial 4.0 technologies, topic, and the year of the review articles of the recent review studies are compared with our paper in Table 1.
Table 1 reports that no comprehensive review analysis in SC optimization, which connects I4.0 technologies with the OR methods, is observed in the current literature. Most of the review papers concentrate on the potential of the I4.0 in SC management, for instance, BDA (Kumar et al., 2023; Talwar et al., 2021) and Blockchain (Antônio Rufino Júnior et al., 2022; Risso et al., 2023). Although the studies by Nguyen et al., (2022a, 2022b) and Agrawal et al., (2023) have used I4.0 and digitalization to represent the data enablers in SC, both of them fall into the description of the potential applications as well as the associated benefits of the data technologies. Gupta et al., (2022a) studied the role of AI in decision support systems with OR approaches. Among all the review papers, only two studies, by Kumar et al., (2023) and Jahani et al., (2023), have mentioned the OR methods in SC management. However, both of them have not addressed the fundamental components in problem-solving, like the decision variables and modeling procedure.
The current studies have paid attention to the impacts of I4.0 on SC but failed to explore how emerging data technologies can contribute to the decision-making process in SC. Moreover, after 2020, a literature review that considers a broad perspective of OR methods crossing maps with the application of I4.0 is still absent. It is worth noting that academic research and industrial engagement in this transformation have been booming in the past years. By completing an up-to-date analysis of current research published from 2013 to 2022, the present study attempts to close this gap.
3 Research methodology
The SLR method and the content analysis were employed to provide an exhaustive overview of the literature on SC optimization in I4.0. The SLR requires a comprehensive research design and has the advantage of minimizing potential bias in collecting and extracting published papers by bringing together the material in an explicitly structured fashion (Kim & Fortado, 2021). The three phases of the SLR are assembling, arranging and assessing of literature, which refers to the acquisition, purification, and evaluation of the candidates (Kumar et al., 2023). We conducted a content analysis of the selected articles during the assessing phase in order to determine the specific categories that could encompass each of these studies. Content analysis is known as a replicable technique that allows researchers to evaluate texts systematically by creating fewer content categories with a manual coding approach (Kim & Fortado, 2021). Thus, the combination of the SLR method and the content analysis enabled us to recognize and highlight the theories and techniques used and reveal similarities, differences, original research gaps, and promising avenues for future research.
3.1 Literature collection and extraction
Literature inclusion and exclusion followed a structured screening process while confining our search to papers published in the period 2013–2022. Figure 1 summarizes the systematic article search and extraction processes.
In Step 1, the scope of the target articles was delimited by focusing on SC optimization in I4.0. Thus, two groups of keywords created 44 combinations of keyword pairs for collecting articles between 2013 and 2022:
Group 1: Words related to industrial 4.0: “RFID”; “cyber”; “big data”; “Industrial 4.0″; “AI/artificial intelligence”; “data mining”; “machine learning”; “smart”; " blockchain”; “cloud computing”; “digital/digitalization”.
Group 2: Words related to SC management: “supply chain”; “logistics”; “supplier”; “inventory”.
In Step 2, the articles whose abstracts contain the combined keywords are collected from two data sources. Data source 1 refers to the core database of the "Web of Science" (WOS), which provides extensive coverage of peer-reviewed scientific literature (Diaz-Balteiro et al., 2017; Wang et al., 2019). Data source 2 represents journals with star ratings above 1 on the Association of Business School list, which are not included in the WOS, in the categories of Operations and Technology Management and Operations Research and Management Science. In this step, 14,847 results were obtained from the two databases.
In Step 3, the articles are examined and eliminated using three criteria. Firstly, the abstract of the articles was examined for related content, namely, papers that failed to address SC optimization with OR methods were excluded. Thus, review and conceptual papers were also removed. Secondly, since the revolutionized impact of I4.0 depends on the value extraction from real-time data and big data, the papers that focus on the foundational value of the information technologies, such as accuracy improvement using RFID or seniors, were excluded. Thirdly, articles confined to AI algorithms, such as artificial bee colony algorithms, fuzzy sets, and artificial neural networks (ANN), were also removed. Finally, we identified 212 highly related papers for further analysis.
3.2 Literature evaluation with content analysis
The content analysis ensures that the classification is trustworthy and thorough. The literature was classified and reviewed with content analysis following the literature evaluation framework in Fig. 2. Both inductive and deductive approaches in content analysis were employed to classify the articles into a set of categories so that their characteristics and contributions are identified and analyzed. In the deductive approach, the categories are defined in advance before analyzing the contents, whereas in the inductive approach, they are identified by analyzing the sample (Abedinnia et al., 2017). The first three groups along with their sub-groups are produced with a deductive approach based on the previous review articles in the literature representing the characteristics of SC optimization I4.0:
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1.
I4.0 technologies: A group of keywords was used to represent the data enablers in I4.0; however, not all technologies were included in the final paper database, as shown in Fig. 2. Most of the papers addressing sensors, digital twins, or I4.0 were conceptual analyses and failed to fit the criteria for further analysis. Hybrid indicates the occurrence of an industrial problem involving two or more I4.0 technologies.
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2.
SC optimization levels: The sample was grouped into three categories according to the duration of the impact of the decisions on SC operations: strategic, tactical, and operational decisions, which were distinguished based on the time duration of their impacts on the SC and were separately evaluated by years, months, weeks, or days (Barbosa-Póvoa et al., 2018). Because low-level decisions are often synchronized with high-level decisions, such as logistics flows and facility location in SC network design, the papers about strategic decisions were grouped at the strategic level. Papers focusing on operational decisions separately were classified into the operational category.
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3.
OR methods: The publications were classified based on the problem scopes, modeling approaches, and the solution approach to solve the SC problem. The linkage among the I4.0 technologies, SC decisions, and OR methods was identified.
The following two groups along with their sub-groups are generated using the inductive method, the contents of the sample articles were analyzed thoroughly to identify the benefits of the adoption of the I4.0 in SC and indicate research frontiers and opportunities for future study.
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4.
Metrics: The metrics in papers indicate the objectives that can be achieved by the organizations by connecting the I4.0 technologies and OR methods.
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5.
Challenges and opportunities: The challenges in terms of four new modeling components and the future research agenda were presented.
4 Publication meta-analyses
To illustrate the distribution of the reviewed articles, we have tailed the collection in the function of publication time, epitomized the contributing journals, compiled the decision levels, and timed the I4.0 technologies and modeling techniques.
4.1 Thematic categorization
Figure 3 shows the chronological development of the collections and their thematic scopes. The different blocks in the figure document the allocation to the eight main I4.0 categories that have been adopted to convey SC optimization with OR methods. The number of studies in this domain has been continuously increasing since 2013. Specifically, the number of articles almost tripled in 2020. Blockchain, IoT and ML are among the top three groups that have been addressed mostly by the selected papers.
4.2 Industrial 4.0 technologies categorization
The implementation of I4.0 in the SC optimization was quite diverse (Fig. 4), and the technology spectrum is still expanding and evolving. To avoid any misunderstanding, we coupled an article with an I4.0 technology only when the paper specified this technology with identified algorithms. For instance, a study investigating data mining was not tagged as a paper with AI. Articles were grouped according to the exact algorithms if more than one I4.0 technology have been mentioned. For instance, both AI and ML are addressed by Euchi et al., (2020), however, it was marked as an ML paper because the proposed solution is mainly based on the k-means clustering method (Gambella et al., 2021). A detailed analysis of the technical terms in I4.0 is available in Dalenogare et al., (2018) and Koh et al., (2019).
Figure 4 shows that 40.1% of the I4.0 technologies were deployed in strategic decision-making. The decisions on the investment in blockchain and IoT are the main contributors to this category. In a similar vein, the two data technologies are also among the mainstreams of the articles at the tactical level. Operational decisions, such as scheduling and delivery, occupied 29.2% of the sample and mainly benefitted from ML.
4.3 Journals categorization
A total of 212 papers, for further analysis, were collected from 53 journals, 11 of which contributed more than five papers (See Fig. 5), and 28 journals encompassed one related paper each. All the top three contributing journals, including the International Journal of Production Research, Computers & Industrial Engineering, and Annals of Operations Research, fall into the Management Science and Operations research spectrum (See Fig. 5). After a thorough scrutinization, it is surprising to observe that some of the leading journals only have limited articles in this crossing domain. For instance, Decision Sciences and Journal of Operations Management, the former has one qualified article (Cai et al., 2020) and no article is detected in the latter. The detailed journal categorization of the selected 212 articles is reported in Appendix 2.
4.4 Modeling methodological categorization
The OR methods used in the reviewed articles are illustrated in Fig. 6. Although such classifications can overlap, attempts were made to place all the articles into appropriate groups. Among these categories, the game-theoretic (GT) approach is the most frequently applied method for assessing the cost and benefit of I4.0. Integer linear programming (ILP)- and fuzzy-based approaches are popular methods. The former is common in vehicle routing problems (VRP) (Chen et al., 2013; Moradi, 2020), whereas the latter is often employed in supplier selection (Chen et al., 2020; Liou et al., 2021) and network design (Abbasi et al., 2020; Hajipour et al., 2019). In this study, we identified a new modeling method, the real-time data-driven programming (RDP) approach, in five articles. Moreover, 47 papers, accounting for 22.3% of the reviewed articles, developed mathematical models that cannot be categorized into one of the well-known modeling methodologies. This implies that the SC optimization becomes more intricate in I4.0, and it is difficult to establish models following the standard programming structure. Thus, innovation in OR approaches is required to respond to the new SC arena.
5 Summary of review findings
5.1 Role of industrial 4.0 technologies in supply chain optimization
Internet of Things IoT is a system of objects equipped with electronics, such as RFID and sensors, with the capability of collecting and sharing data (time, location, quantity, etc.). The IoT allows the items to be sensed and identified remotely across the SC network, creating opportunities for optimizing inventory levels, parcel delivery schedules, and vehicle routes in SC. The most recent industrial advances are related to decreasing product losses and lead time of transportation (Hajipour et al., 2019), detecting anomalies in logistics (Cao et al., 2019; Mejjaouli & Babiceanu, 2015; Sun et al., 2020), monitoring risks in cold chains(Tsang et al., 2018), tracking spare parts (Karatas & Kutanoglu, 2020), screening the perishable inventory level (Liou et al., 2021; Stefánsdóttir et al., 2022; Yang et al., 2019), and dispatching and picking up orders of online services (Liu et al., 2019a, 2019b; Sun & Ji, 2022; Wang et al., 2020).
Artificial intelligence AI is a data-learning system with the ability to discover and reveal hidden rules and patterns in business. Popular AI algorithms comprise bio-inspired algorithms, such as neural networks, swarm intelligence, and algorithms for unstructured data analysis, such as natural languages and cognitive computing. AI is competitive in dealing with sophisticated decision-making problems, where the optimal or exact solutions are either too expensive or difficult to be produced (Preil & Krapp, 2022). It has been integrated with OR methods in demand management (Duan et al., 2019; Liu et al., 2022a, 2022b), inventory control (Preil & Krapp, 2022; Tsang et al., 2020), supplier selection ( Kuo et al., 2015), and SC design (Cai et al., 2022; Zhang et al., 2017).
Machine learning Among the AI spectrum, ML techniques have recently gained attention because of their high efficiency in analyzing real-time data. The widely used ML algorithms in SC are supervised, unsupervised, and reinforcement learning (Riahi et al., 2021). Studies have adopted ML to forecast customer demands (Ren et al., 2020; Zhu et al., 2021), analyze production feasibility in SC design (Bhosekar & Ierapetritou, 2021), and generate vehicle routes for product delivery (Jun & Lee, 2022; Ren et al., 2022). ML has also been combined with the heuristic algorithm to solve OR problems (Chobar et al., 2022; Gumte et al., 2021; Moradi, 2020).
Block chain Blockchain technology changes the power relationships in SC by allowing organizations to manage their data in a decentralized manner via consensus-based validation protocols and cryptographic signatures, rather than in a centralized legacy system. It is often mentioned as a transparent, secure, efficient, confident, and immutable solution for tracking, tracing, and verifying transactions across the SC (Chang et al., 2021; De Giovanni, 2020). The recent progress in blockchain includes intelligent contracting (Choi et al., 2020; Zheng et al., 2020), risk management (Choi, 2020; Lohmer et al., 2020; Niu et al., 2022), quality verification (Shen et al., 2021; Yang et al., 2022a, 2022b), cryptocurrency payment (Yuze Li et al., 2021), and information recording and sharing (Maity et al., 2021; Niu et al., 2021a, 2021b; Wang et al., 2021) in SC.
Data mining DM is the extraction of unexpected valuable knowledge or patterns from large datasets. Its applications have been directed at rule mining, like dispatching rule in logistics (W. Chen et al., 2013), purchase patterns for anticipatory shipping (Lee, 2017; Viet et al., 2020), and rule selection for reducing the inventory level (Dev et al., 2016). Another interesting research stream has used the DM method to preprocess the input data of the parameters in OR models (Gumte et al., 2021; Li, 2019). In addition, it has also been adopted to extract knowledge from historical data for supplier evaluation (Liou et al., 2021).
Big data analytics BD is often referred to as vast volumes and diverse datasets with complex relations. BD has been labeled with 3 V features, namely high volume, variety, and velocity (Lamba & Singh, 2017; Mishra & Singh, 2022) or 5 V features by adding veracity and value (Ivanov et al., 2019). Thus, the term BD analytics is used by academia to interpret the value extraction process (Arunachalam et al., 2018; Gholizadeh et al., 2020; Ying et al., 2022). BD analytics serves the OR approaches by preprocessing the values of parameters, such as customer demands (Gholizadeh et al., 2020; Mishra & Singh, 2022; Wu et al., 2020a, 2020b) and cost values (Gholizadeh et al., 2020; Peng et al., 2022) in SC optimization.
Cloud computing CC represents the on-demand computing services offered to customers via a network in a self-service fashion, independent of the physical location of the hardware and software. CC enhances SC collaboration (Ivanov et al., 2022; Yu et al., 2017) and visibility (Kochan et al., 2018) via information sharing. It also has been used for low-carbon supplier selection by collecting the emission information (A. Singh et al., 2018a, 2018b) and SC design by gathering the cost information (Ali et al., 2021).
Other data enables Leading digital technologies also include additive manufacturing, digital twins, robotics, augmented reality, and other emerging I4.0 technologies that interact with different businesses in SC. However, in current literature, these technologies are mostly addressed concerning production lines, flow shops, or stock management rather than from the SC perspective.
5.2 Data-enabled decisions at different supply chain levels
5.2.1 General overview
Figure 7 shows that strategic decisions, tactical decisions and operational decisions occupy 27.0%, 52.8% and 20.0% of all the decisions respectively. Among the strategic decisions, technology adoption has been investigated more explicitly. At the tactical level, the decisions are diverse and share similar occurrences. The product/service delivery (also mentioned as vehicle routing) optimization using ML is the predominant decision-making operational decision.
5.2.2 Strategic decisions
The most recent strategic decision-making studies also involve some tactical or operational decisions, except for the articles dedicated to partner selection (Chen et al., 2020; Liou et al., 2021), technology adoption ( Manupati et al., 2022), or cyber security investment (Yanhui Li & Xu, 2021; Sawik, 2022; Schmidt et al., 2021). From a detailed content-wise classification standpoint, we analyzed the strategy-level articles by concentrating on I4.0 and its roles, main decisions, and OR methods, as listed in Table 2. The details of the OR aspects of the papers are analyzed in the following subsections.
Network design SC network design often deals with facility locations with a fixed cost consideration. Facility location using ML algorithms in forward SC was the main concern of the authors. Gumte et al., (2021) optimized the numbers and locations of suppliers and manufacturers in biowaste SC. Similarly, for the bio-based energy SC design, the ordinary kriging technique was used by Medina-González et al., (2020). The textual data were transformed into inputs of the location–allocation mixed-integer linear programming (MILP) model by Singh et al., (2018a, 2018b) for cold chain design. However, the 3 V features of big data were absent in this study. Mishra and Singh (2022) have analyzed network configurations in reverse SC with 3 V parameters. An ML-aided metaheuristic framework was developed by Xiao et al., (2022) for a production/distribution system design. Liu et al., (2022a, 2022b) established a MILP model where the ANN was adopted to predict customer demands for E-logistics distribution network design.
Partner selection Most studies have investigated sustainable partner evaluation problems (Chen et al., 2020; Singh et al., 2018a, 2018b). ML was embraced by Wu et al., (2020a, 2020b) to classify partners into strategic, preference, leverage, and routine suppliers. The SVM was exploited by Liou et al., (2021) to extract core criteria from historical data for supplier performance evaluation. Singh et al., (2018a, 2018b) surveyed the low-carbon supplier selection problem in beef SC in a big data context; however, the data analytic approach was absent in this study. The blockchain service platform provider selection problem was studied by Bai et al., (2021).
Technologies adoption The implementation of I4.0 is expensive and needs to be explicitly assessed. The investment in blockchain can be separately assessed (Liu et al., 2021; Yang et al., 2022a, 2022b) or coupled with other SC decisions ( Manupati et al., 2022). The cost allocation of the IoT among the SC was addressed coupled with the environmental concern by Nativi and Lee (2012) and the social welfare consideration by Zhang and Liu (2021). Moreover, Blockchain and IoT adoption problems are often scrutinized in two-echelon SC, while the implementation of BD is common in three-echelon SC. Above all, the potential barriers to I4.0 implementation have not been elaborated explicitly, with the exception of Kazancoglu et al., (2021) and Hosseini Dehshiri et al., (2022).
Cyber security control Cyber security aims at protecting critical data facilities, such as servers and databases, in multi-tier SC with the constraint of investment (Cheung & Bell, 2021; Sawik, 2022; Schmidt et al., 2021). Studies have focused on proactive actions by developing robust cyber-layer networks to enhance the risk-mitigating capabilities of SC. Popular decisions regarding cybersecurity protection include the preferred security level (Cheung & Bell, 2021; Sawik, 2022), safeguard selection (Schmidt et al., 2021), and defense expenditures (Cheung & Bell, 2021; Prajapati et al., 2022).
5.2.3 Tactical decisions
Unlike decision-making at the strategic level, the tactical decisions are rarely considered with a lower level of operational decision. In a general sense, the articles can be classified into six groups based on their main decision variables in the models: wholesale and retail pricing, ordering quantity, inventory level, and SC configuration coupled with order allocation. With similar strategic-level literature scrutinizing schemas, Table 3 documents the tactical decision-making elements.
Wholesale and retail pricing Wholesale and retail pricing can be optimized simultaneously or separately. The first stream of literature studies the pricing decisions of wholesalers and retailers, accompanied by order quantity. Niu et al., (2021a, 2021b) focused on the pricing policies of medicines with blockchain for information transparency and quality trust. The pricing rules of green products in the big data environment are explored by Liu and Zhang (2022) and Li et al., (2022) separately. The second stream of literature includes pricing chilled food with sensor data (Hu et al., 2022; Li & Wang, 2017) and products on the online platform where the quality information is disclosed by blockchain (Ma & Hu, 2022; Xu & He, 2021).
Inventory level The inventory level was optimized isolatedly in this group. Considering the IoT-based forecast updating demand, T.-C. Kuo et al., (2021) analyzed parts inventory allocation policy in manufacturing SC. F. Wang and Lin (2021) addressed the optimum replenishment path, covering inventory level and ordering quantity, for understocked spare parts distributors. Ekren et al., (2021) discussed the re-order and up-to-inventory levels in a lateral inventory share-based system in E-commerce food SC.
SC configuration The SC configuration covers process design and facility incorporation decisions without considering the fixed costs. SC configuration is often determined by order allocation among suppliers (Kaur & Singh, 2018; Kuo et al., 2015; Lin et al., 2022), third-party logistics providers (Kaur & Singh, 2018; Ren et al., 2020), and flexible production facilities (Bhosekar & Ierapetritou, 2021; Rajput & Singh, 2022). This decision often occurs in the context of the manufacturing industry (Dev et al., 2016; Ivanov et al., 2022; Maity et al., 2021), sustainable SC (Kaur & Singh, 2018; Peng et al., 2022; Rajput & Singh, 2022), e-commerce (S. Ren et al., 2020), logistics service procurement (Kong et al., 2021), anticipatory shipping (C. Lee, 2017; Viet et al., 2020), and hospital SC (Kochan et al., 2018). Referring to the I4.0 technologies, all of them have been used with almost the same frequency in SC configuration.
Ordering The occurrence of the ordering decision was verified in both product inventory control and service outsourcing on the cloud platform. The order quantity and re-order point were studied by Yang et al., (2019) and Liou et al., (2021) in perishable and vendor-managed inventories, respectively. The order quantity of hospitals and the transshipment quantities between them were optimized by Abbasi et al., (2020) for blood SC management. Some authors have explored the third-party logistics service provider and customer matching problem (Aghamohammadzadeh et al., 2020; Ran & Liu, 2020) and the optimum order quantity generation in multi-echelon SC on a cloud platform (Y. Yu et al., 2017).
5.2.4 Operational decisions
In addition to articles that have addressed strategic or tactical decisions, several prior studies have also focused on SC optimization at the operational level. The main operational decisions in logistics consist of the scheduling and delivery of products. Those decisions have been made both in manufacturing SC (Ivanov et al., 2016; Jamrus et al., 2020; Zeng et al., 2022) and service SC, such as logistics services (Ran & Liu, 2020; Weaver et al., 2022) and medical services (Euchi et al., 2020). Table 4 lists some of the main elements of the selected literature at the tactical level.
Scheduling Recent articles on scheduling in SC not only have fallen into the manufacturing category but also the service division (Euchi et al., 2020; Weaver et al., 2022; Zahedi et al., 2021). DM is the dominant I4.0 technology that has been implemented to refine the input parameters of the OR models (Smith & Ehmke, 2016) and cluster the customers (M. Wu et al., 2019). A few studies investigated the scheduling problem in the production–distribution system (P. He et al., 2022; R. S. Kumar et al., 2016; Liao & Wang, 2019; Zeynivand et al., 2021). The short-term scheduling in CPS-enabled SC was investigated by Ivanov et al., (2016). Kang et al., (2019) addressed the real-time new order assignments in crowdsourced parcel delivery. J. Sun et al., (2020) constructed a model to determine the optimal switching point in an intelligent production network. P. He et al., (2022) investigated the integrated production and transportation scheduling problem in 3D-printing spare parts SC.
Delivery Product delivery management is often addressed as the VRP in literature but we only focus on those who have addressed I4.0 technologies. In this domain, the articles can be classified into two clusters based on whether they have specific applications. The first cluster aimed at developing innovative algorithms to solve the classical VRP problem by introducing ML (W. Chen et al., 2013; Ghiani et al., 2022; Moradi, 2020; Qin et al., 2021). The second cluster focused on the routing or rerouting the vehicles with distinct applications, such as drone-based routing (X. Chen et al., 2022; Salama & Srinivas, 2020) and real-time rerouting under disruptions (S. Liu et al., 2019a, 2019b; Mejjaouli & Babiceanu, 2018; J. Wang et al., 2020; K. Zhang et al., 2022a, 2022b).
5.3 Operational research methods for supply chain optimization in industrial 4.0
5.3.1 Modeling approaches
5.3.1.1 Game-theoretic approach
The implementation of I4.0 requires cooperation between the players in the SC to share the cost and the benefit. GT models address these advances by creating coordination between players, hence obtaining optimum behaviors in the new data environment. The Stackelberg game model is the most popular method, while the bargaining game model (H. Yang & Chen, 2020), evolutionary game model (W. Liu et al., 2022a, 2022b; W. Liu et al., 2021; Wan & Qie, 2020), differential game model (Ma et al., 2021; M. Xu et al., 2022), and Nash game model (Choi, 2020; Liu & Yi, 2017; Zheng et al., 2020) are also utilized. However, current studies are confined to static games where players make side payments or form coalitions.
More than half of the reviewed papers in this arena have evaluated the investment in IoT (Ben-Daya et al., 2022; X. Li, 2020; H. Yang & Chen, 2020), BD (Liu & Yi, 2018a; H. Song et al., 2022a, 2022b), and blockchain (Choi, 2020; M. Liu et al., 2021; Niu et al., 2021a, 2021b). There is a huge scope to study the investment involving the remaining I4.0 technologies using the GT approach.
The coordination in two-echelon SC has been analyzed explicitly, but is limited to manufacturers and retailers, such as stated by Choi (2020); De Giovanni (2020); Liu and Yi (2018a, 2018b); Ma and Hu (2022), with no mention of manufacturer-supplier SC. A few studies have extended the discussion to multi-player games in two-echelon SC. Liu and Yi (2018a) established a Stackelberg game model, in which a data company is the game leader and sells the BD of consumer preferences to the manufacturer. X.-Y. Wu et al., (2021) defined a Stackelberg game, in which the manufacturer decides the wholesale prices of the fresh product and a third-party logistics provider decides the service price afterward. Only one article considers a multi-echelon SC, where a supplier, manufacturer, and retailer are in a Stackelberg game (Fan et al., 2022).
The multiplayer platform SC is a new application area of game theory. Wan and Qie (2020) analyzed cooperative games between cooperatives and smart SC platforms. W. Liu et al., (2021) defined a three-party evolutionary game to investigate BD discriminatory pricing behavior in platform SC. X. Li (2020) designed a Stackelberg game where the platform SC acts as a connector between manufacturers and consumers in agency selling practices. W. Liu et al., (2022a, 2022b) adopted the evolutionary game theory to analyze smart logistics ecological cooperation with data sharing and platform empowerment. A Stackelberg differential game model is developed by Ma and Hu (2022) to optimize the combination of “blockchain & sales format” in closed-loop SC. This study shows that platform recycling can be improved by building consumer trust with the adoption of blockchain.
5.3.1.2 Integer linear programming-based approaches
The ILP-based approach represents a set of optimization methods, in which both the objective and constraints are integral and linear. The MILP model is the most well-known and widely used ILP-based approach for SC design and VRP problems. ILP-based methods are the main modeling techniques for VRP problems with time windows (Euchi et al., 2020; Moradi, 2020; Yong Wang et al., 2018; Worawattawechai et al., 2022). Most recent studies in this domain aim at deriving efficient algorithms, whereas only a few of them are conducted in a real-world context. The routes of synchronized home healthcare visits were investigated by Euchi et al., (2020) using the MILP technique. Zahedi et al., (2021) established two models for transferring the suspected COVID-19 cases in IoT-enabled relief SC. The first NLP-based model aims at promising an earlier visit to the suspected case with the lowest priority, whereas the second ILP-based model aims at minimizing the total response time. A MILP model was established by Gopalakrishnan et al., (2021) to optimize the quantity of solid waste traded between supplier and consumer companies in a blockchain-based waste recycling SC.
ILP-based models are also used to maximize profit (Gopalakrishnan et al., 2021; Rahmanzadeh et al., 2022) or minimize costs (Euchi et al., 2020; Rajput & Singh, 2022; A. K. Singh et al., 2018a, 2018b; Xiao et al., 2022) of a SC. However, only a few studies have extended the single-objective problem to multi-objective optimization. Medina-González et al., (2020) considered the three objectives of net present value and environmental and social aspects to design a bio-based energy SC. The fleet size and total traveling distance were simultaneously optimized by Moradi (2020) for the VRP problem with time windows. The environmental and economic objectives are considered by Chobar et al., (2022) to design a hub‑spoke network of perishable tourism products.
5.3.1.3 Non-linear programming-based approaches
NLP-based approaches contain nonlinear terms in the objectives or constraints. The intricate relations among the variables and parameters are common in SC optimization. In this subsection, we only analyze articles with NLP-based models that failed to be grouped into other modeling techniques, such as stochastic programming or fuzzy-based methods. A two-objective NLP-based model was developed by H. Lee et al., (2018) to minimize the fuel cost and maximize the service level by optimizing the vessel speed using a weather archive BD.
If the decision variables are confined to the integer values, the NLP-based approach is also mentioned as mixed integer nonlinear programming (MINLP). Vijaya K Manupati et al., (2020) developed a MINLP model to design a blockchain-based SC to minimize cost and emissions. Similarly, a MINLP model was established by Hajipour et al., (2021) to maximize the number of undamaged delivered items in an IoT-enabled relief SC design. Bhosekar and Ierapetritou (2021) also adopted the MINLP approach to analyze the feasibility of configuring a modular manufacturing system. The MINLP method was borrowed by Prajapati et al., (2022) to determine the optimum configuration of the blockchain and IoT-embedded closed-loop SC network in E-commerce. Similarly, the network configuration of an E-commerce SC is investigated by Rahmanzadeh et al., (2022) to maximize the total net profit.
5.3.1.4 Stochastic and robust programming
Ignoring the uncertainties in SC optimization leads to less realistic results. The availability of real-time and big data contributes to foreseeability but can not eliminate all the impacts of unforeseen events. Three modeling techniques—stochastic programming, robust optimization, and fuzzy programming—are widely used to deal with uncertain parameters in this domain.
In stochastic programming, uncertain events are assumed to occur with known probabilities, which is practical in strategic decision-making in SC. Hajipour et al., (2019) established a stochastic MINLP model to optimize the configuration of a traceable closed-loop SC network. Flores and Villalobos (2020) provided a two-stage stochastic framework to optimize the schedule of agricultural production. In this study, the farming technologies were selected for each identified region, and operational decisions were made under various discretized yield and market scenarios. The main ambiguous sources of cybersecurity risks are the occurrence of cyber attacks and the effectiveness of alternative controls. Thus, another application of stochastic programming is to obtain optimal investments in SC by selecting a portfolio of cybersecurity safeguards (Sawik, 2020, 2022; Schmidt et al., 2021). Considering the uncertain demand of customers, two-stage stochastic mathematical models were used by Maity et al., (2021) and Abbasi et al., (2020) to separately allocate the inventory along the SCs. The former aims at determining the quantities of raw materials used in the facilities (first stage) and logistics flows (second stage) in a blockchain-enabled food SC. The latter investigates the transshipment of the blood among the healthy centers by minimizing the cost of the medical SC.
Robust optimization seeks premium results in the worst case when the probabilities of the uncertain parameters are undisclosed. As a popular ambiguity-averse method in SC optimization, it has been undertaken within a limited scope in the context of I4.0, with only a few exceptions. Gumte et al., (2021) considered the worst-case realizations of the uncertain demand and the supply of biomass feed in a biowaste SC network design. Polo et al., (2019) employed the hybrid robust fuzzy stochastic method to generate optimal sustainable procurement and transportation decisions. Z. Cai et al., (2022) adopted the graph theory to design a robust logistics network by building a multi-objective robustness function, including relative robustness, betweenness robustness, edge robustness, and closeness robustness.
5.3.1.5 Fuzzy-based approach
Fuzzy-based approaches represent quantitative models where the fuzzy set theory provides details of vague information in the decision-making process. Triangular fuzzy numbers are the dominant methods to assess the best alternatives (A. Singh et al., 2018a, 2018b; C. Wu et al., 2020a, 2020b) and capture the uncertainties in mathematical programming (Coppolino et al., 2021; Jamrus et al., 2020).
Fuzzy numbers are often integrated with the rough method (Z. Chen et al., 2020) or analytic hierarchy process (AHP) (A. Singh et al., 2018a, 2018b) to mitigate internal and external uncertainties. C. Wu et al., (2020a, 2020b) defined a fuzzy ensemble learning model to classify sustainable partners by considering both qualitative and quantitative inputs. Belhadi et al., (2021) established an AI-based decision framework to identify patterns in the SC resilience strategies. Y. Tsang et al., (2020) adopted the fuzzy triangular method to describe the ambiguous inputs and outputs of the dynamic routing model. Fuzzy trapezoidal numbers were used by Jamrus et al., (2020) to represent the epistemic makespan of the coordinated scheduling in smart production.
5.3.1.6 Simulation approach
Many complex systems cannot be represented using accurate and convenient mathematical models. The advantage of a simulation method is that it mimics the behaviors and intricate inactions of the individuals in the business while avoiding sophisticated problem breakdown or algorithm development. Compared with the models in other categories, the results of simulation-based optimization are built on the assumptions and simulation framework (Illgen & Höck, 2019). Thus, it is essential to validate the findings by repeating the experiments independently several times under various situations (i.e., parameter combinations). However, only a few studies have verified the reliability of simulation results by statistical analysis (L.-M. Chen & Chang, 2021; Nativi & Lee, 2012; Weißhuhn & Hoberg, 2021) or sensitivity analysis (Alqahtani et al., 2022; Dev et al., 2016; Kong et al., 2021).
The discrete-event (DE) simulation has been the mainstay of the simulation community to derive the optimum replenishment policies (Weißhuhn & Hoberg, 2021) and cyber risk mitigations (L.-M. Chen & Chang, 2021; Shi et al., 2021). The ARENA simulation software package with the OptQuest optimizer was used by Ekren et al., (2021) and Nativi and Lee (2012) to conduct DE simulation-based optimization in IoT-empowered SC.
Multi-agent systems (MAS) contain decision-making entities with autonomous behaviors. The cooperation of the agents within a MAS enables it to deal with the uncertainties and dynamics in SC optimization (Dev et al., 2016; Kong et al., 2021; F. Wang & Lin, 2021; X. Xu et al., 2021; Y. Yu et al., 2017). Studies have used the ML technique, such as decision tree learning (Dev et al., 2016; Jelen et al., 2022), Q-learning algorithm (F. Wang & Lin, 2021), and reinforcement learning (Alqahtani et al., 2022), to derive the rules of agent behavior in the MAS.
5.3.1.7 Real-time data-driven programming
Some structural models that share the following characteristics are observed in SC optimization in I4.0: (1) they follow the mathematical programming regimen, for instance, optimization objectives are subject to a set of constraints, but difficult to be grouped into a well-known modeling technique exactly; (2) they have time-dependent decision variables and real-time inputs; and (3) the state of the model is dynamic, similar to the model solving process. Thus, the term RDP technique was used to refer to this approach in this review.
The RDP model is mainly used in VRP problems with real-time data generated by the IoT. S. Liu et al., (2019a, 2019b) developed an RDP model to optimize the costs of task delivery of smart vehicles. A multi-objective RDP model was established by J. Wang et al., (2020) to coordinate customers, order-picking robots, and cloud technology dynamically. Mejjaouli and Babiceanu (2015) constructed an RDP model to determine whether the producer should deliver fresh products to retailers when the spoilage of products is reported by the IoT during transportation. D. Li and Wang (2017) analyzed dynamic pricing policies in light of the identified quality features of the on-shelf products with sensors.
5.3.1.8 Other mathematical approach
The permeation of the I4.0 technologies into SC optimization requires decision-makers to deconstruct the problems in a new pattern and form unstructured analytical models. The modeling process does not follow any fixed rules but serves specific optimized objectives, for example, BC-empowered data sharing (Z. Wang et al., 2021; Q. Xu & He, 2021) and anticipatory shipping with data mining (C. Lee, 2017) in SC. In addition, three recent studies have been dedicated to the newsvendor model in inventory optimization with blockchain (Chang et al., 2021), AI (M. Li & Li, 2022), and deep learning (S. Ren et al., 2020).
5.3.2 Solution methodologies
5.3.2.1 Common observations
The solution methodologies were deployed based on modeling techniques. For instance, the primary models of the simulation approaches, fuzzy-based approaches, and GT models are the analysis and precision. Exact solution generation is often synchronized with state updating in the RDP model. For exact solutions, commercial solvers, such as CPLEX, Gurobi, and LINGO, are also utilized. Nevertheless, heuristic algorithms are efficient in generating a reasonably good solution of the ILP- and NLP-based models for large-scale problems. Surprisingly, ML-based algorithms are becoming popular in solving ILP-based models, but not in NLP-based problems, as they open a completely unexplored research avenue. Another fast-growing aspect of the solution methodologies is the use of Python as the programming environment for Genetic algorithm (GA) (Y. Tsang et al., 2020), ML-based algorithms (Furian et al., 2021; Salama & Srinivas, 2020; Xiao et al., 2022), and Gurobi solver calling (de Carvalho et al., 2022; Schmidt et al., 2021), because it can be extended easily with new functions and data types.
5.3.2.2 Commercial solvers
For small- or medium-scale problems, a commercial solver can generate an optimal or near-optimal exact solution within a reasonable computation time. The literature shows that the Gurobi is preferred to find the portfolio of the cybersecurity mitigations in SC (Sawik, 2022; Schmidt et al., 2021), while the CPLEX works at all three SC decision levels. In contrast, LINGO was only applied to solve the ILP-based models (Mishra & Singh, 2022; Rajput & Singh, 2022) and NLP-based models (Pitakaso et al., 2022; Prajapati et al., 2022). Although some optimization solvers, such as CPLEX and Gurobi, are capable of dealing with the integer quadratic programming model, they have been observed only in one study by Karatas and Kutanoglu (2020).
Remarkably, most commercial solvers are directly exploited for ILP-based models. Only a few studies have deployed commercial solvers to deal with NLP-based models after linearization, for instance, stochastic models (Mishra & Singh, 2022; Sawik, 2022). To avoid nonlinearity in the objective function, new variables and constraints were introduced by Bhosekar and Ierapetritou (2021) and Sawik and Sawik (2022). For the nonlinear terms in the constraints, the binary equivalents and first-order Taylor series approximation were used by Mishra and Singh (2022) and Sawik (2022), respectively. However, the linearization of LP-base models relies on the nature of the objective and constraint expressions, as well as the structure of the optimization problem. As a vital step to use commercial solvers to solve the NLP-based models, linearization approaches need to be investigated in future studies.
5.3.2.3 Heuristic algorithms
For large-scale and complex problems, we cannot expect to obtain the optimal solution within a limited CPU time. Therefore, the authors have exploited heuristic algorithms like GA (Ali et al., 2021; V. K. Manupati et al., 2022; Y. Yang et al., 2019), particle swarm algorithm (PSO)(R. S. Kumar et al., 2016; H. Lee et al., 2018), and physarum-based algorithm (Z. Cai et al., 2022; X. Zhang et al., 2017), to derive reasonably good solutions. Since the heuristic algorithms are diverse and evolving, they should be selected and adapted based on the characteristics of the models. Different heuristic algorithms can be used separately or in combination to exploit their search strengths in solution generation.
GA is one of the most adaptive heuristic algorithms and is preferred by the authors to solve mathematical models individually. Y. Tsang et al., (2020) developed a two-phase multi-objective GA to solve a fuzzy-based programming model where the dynamic delivery schedules are optimized. Using a cluster-based association for purchase pattern mining, C. Lee (2017) modified the GA to optimize anticipatory shipping plans. The neuro-fuzzy C-means clustering method was adopted by Gumte et al., (2021) to convert a large problem to a small one to more efficiently solve the input data of the MILP roust model by the GA. The GA-based approach is adopted by V. K. Manupati et al., (2022) to derive the optimal recovery strategies for a disrupted SC network.
PSO-based hybrid heuristic algorithms have been used in recent studies to solve complex large-scale problems. Hajipour et al., (2019) combined the PSO algorithm and the greedy randomized adaptive search procedure to solve an NLP-based model. The PSO algorithm is integrated with the ANN by R. Kuo et al., (2015) to allocate the order quantity. Initialed by heuristics procedures, the Krylov–Chernousko method of successive approximation approach was exploited by Ivanov et al., (2016) to optimize short-term scheduling in smart SC. The robustness of a logistics network design is analyzed by Z. Cai et al., (2022) with the help of the artificial physarum swarm algorithm. Zahedi et al., (2021) compared the performances of different combinations of the simulated annealing (SA) algorithm, PSO, and social engineering optimization (SEO). Their analysis shows that the hybrid SA and SEO outperforms others in solving a MINLP model in relief SC design. However, studies evaluating the efficiency and effectiveness of individual or hybrid heuristics are scarce and should be explored more explicitly in the future.
5.3.2.4 Machine learning-based algorithms
ML has been recognized as a computational counterpart to decision-makers in identifying patterns based on experience (Furian et al., 2021). Although both supervised and unsupervised learning algorithms are leveraged, they are unable to directly construct solutions for mathematical models and are often integrated with other algorithms, such as heuristic algorithms (Abbasi et al., 2020; Chobar et al., 2022), branch and price algorithms (Furian et al., 2021), and the cutting plane algorithm (Flores & Villalobos, 2020).
Some authors have employed the reinforcement learning (RL) technique to develop an end-to-end solution to the VRP problems with real-time data. To reduce the CPU time to build the solutions, a deep RL algorithm was used by J. J. Q. Yu et al., (2019) to tailor the parameters of an offline neural network model. The RL with a function approximation was utilized by Kang et al., (2019) to determine the admission of new order requests and dynamic routes of vehicles. The ANN, random forest, classification, and regression tree (CART), and multilayer perceptron (MLP) techniques were adopted by Abbasi et al., (2020) to disclose the relations between the input parameters and decision variables in a stochastic model. Their analysis shows that the MLP model outperforms the other ML techniques in terms of the efficiency of obtaining the optimum order quantities in the blood SC. L. Ren et al., (2022) developed a multi-agent RL approach to optimize the route length and the vehicle’s arrival time for VRP problems. In order to extract scalable heuristics from the best feasible solutions, Jun and Lee (2022) proposed an ML-based approach to improve the heuristics by an evolutionary neural network for pickup-and-delivery problems.
The ML-based algorithms have contributed to the generation of programming-based mathematical solutions by integrating them with various heuristics. The k-means clustering has been adopted to derive high-quality initial solutions by decomposing the space into smaller zones in the VRP (Euchi et al., 2020; Salama & Srinivas, 2020). To govern the evolutionary process in the decision tree, the non-Darwinian-type operators were introduced by Moradi (2020). Their analysis shows that the multi-objective discreet learnable evolution model with the new heuristic operators outperforms classical and meta-heuristics. The MLP classifier was embedded by Gutierrez-Rodríguez et al., (2019) to select the best meta-heuristic for the VRP with time windows. Similarly, as the high-level selection strategy, the RL was adopted by Qin et al., (2021) to select meta-heuristics at the low level. Five supervised learning algorithms, including CART, Gaussian Naive Bayes, and SVM, were applied by Dauer and de Athayde Prata (2021) to reduce the size of the time–space network in variable fixing heuristics by predicting the arcs that a vehicle will be allocated to in multiple depot VRP problems. A learning enhanced golden ball algorithm was used by Worawattawechai et al., (2022) for VRP problems with backhauls.
Random forest classifiers were used by Furian et al., (2021) to predict the values of the binary decision variables and branching scores for fractional variables in a reliability-based branching algorithm. The SVM was adopted and coupled with the cutting plane algorithm by Flores and Villalobos (2020) to identify the relationship between first-stage solutions and yield scenarios in the second stage of the agricultural SC design.
6 Frontiers and research needed for SC optimization in I4.0
6.1 Research frontiers by mapping the new modeling components
The recent advance in the OR methods for SC optimization in I4.0 can be summarized as four new modeling components: new modeling conditions, new inputs of models, new decisions, and new algorithms for model solving, as mapped graphically and numerically in Fig. 8. The four components connect I4.0 technologies and OR modeling approaches at all SC optimization levels. The main streams of the literature and under-examined areas are analyzed in the following subsections.
6.1.1 New modeling conditions
Almost one-third of the articles have treated I4.0 as the modeling condition, for instance, one of the main streams of literature starts from the blockchain and covers GT models at the strategic level (See Fig. 8). These studies assume that the utilization of blockchain would build a new data-sharing SC where the competition or cooperation of the firms would be impacted by the quality monitoring (Chang et al., 2021; He et al., 2021; Shen et al., 2022) or cost tracking (Vijaya K Manupati et al., 2020), but failed to address the process of achieving data sharing using blockchain. Similar observations were also observed in other studies in the context of IoT, BD, AI, or CC.
6.1.2 New inputs
Figure 8 shows the main literature streams related to the new inputs that comprise the IoT, BD, and DM, and serve various OR models except those with GT approaches. The I4.0 reforms the inputs of the OR models by introducing the real-time data, BD, and the shared data as well as preprocessing those data to adapt to the mathematical methods.
The real-time updating inputs enabled by IoT require the OR models to run dynamically to obtain time-dependent solutions. Unfortunately, real-time data are used for periodic decision-making (Ekren et al., 2021; Yang et al., 2019; Zahedi et al., 2021), rather than for data-driven decision-making processes in literature.
BD is well known for its 3 V or 5 V features. However, only a few studies have elaborated on the adaption of parameters with 3 V or 5 V characteristics. Most of the reviewed articles claimed to have conducted the study in a BD environment or considered big data parameters without addressing these significant features. Fast-growing digitalization provides massive amounts of random data that can be used for SC optimization. However, most of the data are unstructured or semi-structured. Despite the widespread acceptance of BD analytics as a knowledge extraction technique, its implementation is still scarce in SC optimization.
6.1.3 New decisions
The adoption of I4.0 is expensive and requires an initial investment and incurs variable costs, such as the blockchain (Chang et al., 2021; De Giovanni, 2020; Y. Song et al., 2022a, 2022b) and BD (Liu & Yi, 2017; Liu & Zhang, 2022). Only a few studies have evaluated firms' decisions to invest in data technologies.
In addition to the direct investment of I4.0, exploiting these techniques can lead to other new decision-making problems, such as cybersecurity mitigations (Sawik & Sawik, 2022), blockchain-enabled data-sharing strategies (Z. Wang et al., 2021; M. Xu et al., 2022), and data technology provider selection (Bai et al., 2021; Coppolino et al., 2021). More recent papers have focused on optimizing investments in I4.0 and cybersecurity. However, the integration of the two decisions in SC optimization is still under-examined.
6.1.4 New algorithms
Organizations have rich experience in daily practices in SC. The knowledge in the historical data can be extracted by DM, ML, or AI to serve as a basis for initially achieving optimal/near-optimal solutions (W. Chen et al., 2013). Moreover, the solution generation procedures of many algorithms, for example, heuristic algorithms, are also data generation processes that can be guided by these data analytical techniques. However, only limited articles have exploited these techniques in solution generation.
The ML-based algorithms are competitive in terms of computation time, convergence rate, and solution quality. However, most of the ML-based algorithms are problem-specific and substantially focused on ILP-based models, and more innovations are needed to solve the sophisticated models, for instance, the stochastic MINLP model (Flores & Villalobos, 2020). As an emerging and evolving algorithm, ML-based algorithms are not perfect and exhibit a few shortcomings, such as the risk of missing the optimal solution (Flores & Villalobos, 2020) and the dependence on the knowledge of the domain (Moradi, 2020). Furthermore, it is worthwhile to compare the performance of the hybrid algorithms with the exact approaches, heuristic methods, or individual ML algorithms.
6.2 Future research agenda
6.2.1 Incorporating new decisions relevant to data-enabled SC optimization
Joint decisions: The development of the data collection and value extraction capability of an organization requires long-term investment in hardware, software, and technicians. Simultaneously, the benefits brought by I4.0 are manifold, rather than limited to SC integration (T.-C. Kuo et al., 2021; J. Sun et al., 2020) or any other individual aspect. Thus, future research should evaluate the investment in I4.0 along the multi-tier SC in terms of costs, benefits, and cyber risk.
Decisions related to data centers Data centers offering cloud computing services and data management are a vital part of an SC network (Ali et al., 2021). More effort is required to address the process configuration, data backup scheduling, and network design in this area.
Service vendor selection The evaluations of professional service providers and cloud service vendor platforms for data utilization, such as cloud service vendor platforms and professional service providers for AI and BD analytics, are still absent and should be explored in the future.
Risk management The global SC is under severe strain not only owing to COVID-19, military conflicts between Russia and Ukraine, and their secondary disruption but also due to direct and indirect cyber-related attacks. It is difficult to decouple the physical flow from cyber flow (Shi et al., 2021). The scientific community should assist the decision-makers in identifying and evaluating the risks and optimizing the preparations in the global SC.
Decentralized scheduling One of the main shortcomings of centralized and hierarchical scheduling is its complementary response to disturbances (Y. Liu et al., 2019a, 2019b; J. Sun et al., 2020). Future research can examine decentralized scheduling to realize flexible and real-time decision-making in smart SC.
Spare parts SC with 3D printing Additive manufacturing has shown great potential in spare parts offering because constructing a new manufacturing facility with 3D printers is much more efficient than adding conventional production lines (Muhammad et al., 2022; Tosello et al., 2019). Thus, the dynamic optimization of the spare part inventory and the associated SC configurations can be further studied.
6.2.2 Developing data-enabled modeling approaches
Modeling automation The adoption of I4.0 technologies creates fragmented SC optimization scenarios with specific settings, as the organizations are required to construct customized models. To save the resources (money, machines, energy) of the SC optimization and shorten the customization process, more efforts are needed to acclimate the general OR modeling approaches, for example, MILP, to fit customized operational requirements by learning the rules of mathematical representations to support the automatic decision making in SC. The scholars are encouraged to achieve the OR Modeling automation by taking advantage of the Large Language Models, like the Chat Generative Pre-trained Transformer (ChatGPT) model and the Pathways Language Model (PaLM) model.
Self-tuning models Future OR models should be capable of coping with the dynamics by learning from the BD and the real-time data in the background. The self-tuning capability allows the models to reconstruct quantitative relations between the variables and parameters in objectives and constraints to adapt to the changing decision-making environment, for example, moving from single objective to multi-objective optimization.
Real-time data-driven programming One of the main challenges of SC optimization in I4.0 is building and leveraging dynamic interactions between customers, robots, and systems with real-time data-driven processes. It is necessary to continuously run the model to generate real-time decisions by updating input data (Speranza, 2018). The RDP technique needs to be extended and implemented not only in the VRP problem but also in other SC decision-making scenarios, such as scheduling.
Modeling uncertainties The I4.0 technologies are useful in reducing uncertainties, but they cannot be eliminated, especially at the strategic and tactical SC levels. Future studies should concentrate on robust and stochastic approaches when making new decisions, such as data center network design.
Data-related service vendors Professional data-related service vendors, such as the CC platform (Coppolino et al., 2021) and blockchain platform (Y. Cao et al., 2022), have become the pivotal players of the SC. The GT models can be extended by incorporating the dynamic behaviors of data-related service vendors into games in the analysis.
6.2.3 Preprocessing of parameters
Adapting the parameters of big data The classical OR methods have shown weaknesses in dealing with 3 V or 5 V big data, in terms of computational time and solution generation (Gholizadeh et al., 2020; Kaur & Singh, 2018). In future studies, it is essential to convert the huge and unstructured information into a small volume and refined but high-value dataset by BD analytics, like ML and DM, so that it can be adapted to the OR methods to better support SC optimization.
Uncertainty alleviation and elimination Constrained by the availability of the inputs, many previous studies have been built on delicate assumptions, such as estimating customer demands with optimistic and pessimistic outlooks. The data-rich environment creates an opportunity to eliminate or alleviate the uncertainties in SC optimization, such as customer demand (Liu & Yi, 2018b; Peng et al., 2022). It is imperative to utilize data analytical techniques to alleviate and eliminate the uncertainties of parameters of the OR models by predicting their precise changes.
6.2.4 Developing data-enabled algorithms
Self-adaptive and evolutionary algorithms I4.0 allows decision-makers to construct more realistic models, which also complicates their solution generation. The scientific community should develop self-adaptive and evolutionary algorithms by integrating ML, AI, and DM techniques into the meta- and hyper-heuristics.
Learning-based heuristics Future studies should explore both online and offline learning processes to obtain near-optimal solutions from historical data and ongoing data. To improve the efficiency and the effectiveness of the traditional heuristic algorithms, it is advisable to be integrated with ML by guiding the parameters selection of the heuristics, for example, the mutation and crossover rates in GA, and by developing the operators, for example, neighborhood search strategies.
Hybrid exact algorithms The combination of the data analytical techniques and the exact algorithms, such as the branch-and-price, branch-and-bound, and column generation algorithms, is another worthy research direction.
7 Conclusions
7.1 Main contributions
The contribution of this investigation is trifold: methodological, theoretical, and practical. For the methodological contribution, our proposed SLR methodology integrated with the content analysis as well as the literature evaluation framework are scalable and adaptable, which means it can be tailored for future review research concerning the multi-discipline, multi-topic, and multi-method article collections. In addition, the graphical and numerical mapping approach for the new modeling components provides a way to quantify the innovations and the complicated relations among various elements when deconstructing high-quality articles.
From theoretical perspective, it contributes to the literature by identifying the four OR innovations to typify the recent advances in SC optimization: new modeling conditions, new inputs, new decisions, and new algorithms. OR professionals have long been at the forefront of solving SC problems by using mathematical models. The four new modeling components are supposed to serve as a foundation for building new OR methods. Furthermore, four potential future research avenues are recommended for SC optimization in I4.0: (1) incorporating new decisions relevant to data-enabled SC optimization, both in I4.0 adoption and SC decision aspects; (2) developing data-enabled modeling approaches, such as modeling automation, self-tuning models, and RDP models; (3) preprocessing of parameters, including adapting the parameters of big data and uncertainty elimination and alleviation; and (4) developing data-enabled algorithms, such as self-adaptive and evolutionary algorithms, learning-based heuristics, and hybrid exact algorithms. The set of directions elaborated in the thematic analysis is a starting point to guide the development of upcoming research works and provide directions for further literature reviews to be produced.
From practical perspective, this study contributes to a better understanding of the role of OR approaches for SC practitioners who are struggling to find new solution approaches for business success in their own domains. The description of the new operations models and the rich context in which the models are adapted will guide practitioners to select appropriate OR methods to incorporate a variety of decision-making dimensions at different SC levels. The identification of the exciting opportunities that fuse and cross the boundaries of SC and I4.0 paves the way for managers to achieve a decisive competitive advantage by developing more realistic models.
7.2 Concluding remarks
The growing implementation of I4.0 equips the SC as a data-driven system to deliver products and services in a more accessible and affordable manner. It is believed that I4.0 will revolutionize the SC management. The potential benefits of integrating I4.0 and OR methods have been widely reported by both academics and practitioners. However, due to the fragmentation of the results and the lack of a review perspective on OR methodologies, a clear and systemic analysis of the SC optimization in I4.0 is still missing. In this study, the existing literature was systematically reviewed to survey the recent advances in SC optimization in I4.0. More than 14,000 articles were refined and 212 were examined, classified, and analyzed in terms of the: (1) role of I4.0 technologies, (2) SC decisions, (3) modeling approaches, and (4) solution methodologies. The research frontiers, gaps, and promising future perspectives in different domains of SC optimization in I4.0 are presented.
It is observed that AI, blockchain, ML, and IoT are the most addressed I4.0 technologies in current studies. The OR methods have been implemented innovatively in four aspects for SC optimization in I4.0. GT methods are the most popular, whereas robust and stochastic methods are still under investigation. A new modeling form, the RDP model, was identified and elaborated in this analysis. Future research should take advantage of the big data and real-time data offered by I4.0 to enhance the performance of the SC. The deep analysis of the OR methods and the rich I4.0 context would provide valuable insights to the academic community and industry in exploiting the value of the data generated along the SC. Scholars can take this investigation as a means to ignite collaborative research that tackles the emerging problems in business, whereas practitioners can glean a better understanding of how to employ their OR experts to support digital SC decision-making.
Although the methodology adopted was carefully structured, this study has several limitations that we outline here. The findings of this review are applicable based on the limitations of the data sources, which is the core database of WOS. The combinations of the few keywords are used to collect published papers, which may lead to missing of some publications due to the choice of the keywords. In addition, the analysis of the selected papers is based on our interpretation and thus dependent upon our perceptions and categorizations of the collected documents.
Data availability
The data that support the findings of this study are available from the corresponding author Dr. Adel Elomri and the first author Dr. Zhitao Xu, upon reasonable request.
Change history
18 March 2024
A Correction to this paper has been published: https://doi.org/10.1007/s10479-024-05935-4
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Funding
Open Access funding provided by the Qatar National Library. This work was supported by the Key Project of Philosophy and Social Sciences Research in Jiangsu Universities (Grant No. 2023SJZD127), and the Fundamental Research Funds for the Central Universities (Grant No. ND2023006).
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Appendices
Appendix 1. Abbreviation
No. | Abbreviation | Description |
---|---|---|
1 | AHP | Analytic hierarchy process |
2 | AI | Artificial intelligence |
3 | ANN | Artificial neural network |
4 | BD | Big data |
5 | CART | Classification and regression tree |
6 | CPS | Cyber-physical systems |
7 | DE | Discrete-event |
8 | DM | Data mining |
9 | GA | Genetic algorithm |
10 | GT | Game theory |
11 | I4.0 | Industrial 4.0 |
29 | ILP | Integer linear programming |
14 | IoT | Internet of Things |
15 | LP | Linear programming |
16 | MILP | Mixed integer linear programming |
17 | MINLP | Mixed integer nonlinear programming |
18 | ML | Machine learning |
19 | MLP | Multilayer perceptron |
20 | OR | Operation research |
21 | PSO | Particle swarm algorithm |
22 | RDP | Real-time data-driven programming |
23 | RFID | Radio frequency identification |
24 | RL | Reinforce learning |
25 | SA | Simulated annealing |
26 | SC | Supply chain |
27 | SEO | Social engineering optimization |
28 | SLR | Systematic literature review |
29 | SVM | Support vector machines |
30 | VRP | Vehicle routing problem |
31 | WOS | Web of science |
Appendix 2. Journals categorization of the articles
No. | Journals | Number of articles |
---|---|---|
1 | International Journal of Production Research | 30 |
2 | Computers & Industrial Engineering | 24 |
3 | Annals of Operations Research | 22 |
4 | International Journal of Production Economics | 16 |
5 | Transportation Research Part E: Logistics and Transportation Review | 12 |
6 | Journal of Cleaner Production | 9 |
7 | European Journal of Operational Research | 8 |
8 | Sustainability | 7 |
9 | Computers & Operations Research | 6 |
10 | IEEE Transactions on Intelligent Transportation Systems | 5 |
11 | Production and Operations Management | 5 |
12 | Applied Soft Computing | 4 |
13 | Expert Systems with Applications | 4 |
14 | Soft Computing | 4 |
15 | Transportation Research Part C: Emerging Technologies | 4 |
16 | IEEE Transactions on Engineering Management | 3 |
17 | Industrial Management & Data Systems | 3 |
18 | International Journal of Logistics Research and Applications | 3 |
19 | Journal of Manufacturing Systems | 3 |
20 | Applied Mathematical Modelling | 2 |
21 | Computers & Chemical Engineering | 2 |
22 | Discrete Dynamics in Nature and Society | 2 |
23 | Manufacturing & Service Operations Management | 2 |
24 | OR Spectrum | 2 |
25 | Reliability Engineering & System Safety | 2 |
26 | Applied Mathematics and Computation | 1 |
27 | Arabian journal for science and engineering | 1 |
28 | Computers in Industry | 1 |
29 | Decision Sciences | 1 |
30 | Engineering Applications of Artificial Intelligence | 1 |
31 | EURO Journal on Transportation and Logistics | 1 |
32 | IEEE Transactions on Industrial Informatics | 1 |
33 | IISE Transactions | 1 |
34 | Information Sciences | 1 |
35 | INFORMS Journal on Computing | 1 |
36 | International Journal of Computer Integrated Manufacturing | 1 |
37 | Journal of Computational and Applied Mathematics | 1 |
38 | Journal of Computing and Information Science in Engineering | 1 |
39 | Journal of Industrial and Management Optimization | 1 |
40 | Journal of Industrial Information Integration | 1 |
41 | Journal of Intelligent Manufacturing | 1 |
42 | Kybernetes | 1 |
43 | Mathematics | 1 |
44 | Omega | 1 |
45 | Operational Research | 1 |
46 | Optimization Letters | 1 |
47 | RAIRO-Operations Research | 1 |
48 | Resources, Conservation and Recycling | 1 |
49 | Socio-Economic Planning Sciences | 1 |
50 | Soft Computing volume | 1 |
51 | Technological Forecasting and Social Change | 1 |
52 | Technology Analysis & Strategic Management | 1 |
53 | Waste Management | 1 |
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Xu, Z., Elomri, A., Baldacci, R. et al. Frontiers and trends of supply chain optimization in the age of industry 4.0: an operations research perspective. Ann Oper Res 338, 1359–1401 (2024). https://doi.org/10.1007/s10479-024-05879-9
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DOI: https://doi.org/10.1007/s10479-024-05879-9