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Publications (10 of 20) Show all publications
Kumar, V., Harper, S. & Pal, R. (2020). A data-driven approach to incorporate multi-level input in Interpretive Structural Modelling with a case example of small-series supply chain network configuration. In: : . Paper presented at 21st International Working Seminar on Production Economics, Innsbruck, February 24-28, 2020..
Open this publication in new window or tab >>A data-driven approach to incorporate multi-level input in Interpretive Structural Modelling with a case example of small-series supply chain network configuration
2020 (English)Conference paper, Published paper (Refereed)
Abstract [en]

Interpretive Structural Modelling (ISM) is widely employed in production research to study the complex interaction among various factors or elements which define a complex production or supply chain problem. It transforms the poorly articulated mental model of the problem into a visible well-defined relational model using an element-relationship-matrix. Building ISM involves primarily pairwise comparison of factors in rotation i.e. each factor is compared with all remaining factors as input. In general, these relations among the compared pairs are defined in binary levels i.e. the relations are defined in terms of “yes/no”; hence, the interactions are treated equally for all levels of interaction magnitude. Consequently, the interpretation of the results does not capture the intensity of interrelation, which limits the exploitation of the relational model for concrete production/supply chain decision-making. This paper introduces a data-driven algorithm to convert a multi-level pairwise comparison into bi-level groups i.e. groups with weak and strong relations, to incorporate and account for non-binary relations. The bi-level groups are created based on a threshold point in multi-level input that simultaneously maximizes the inter-group variance whereas minimizes the intra-group variance. The application of the proposed approach is demonstrated in context to small-series textile/apparel supply network configuration, in order to show its practical significance in strategic decision-making.

Keywords
Interpretive Structural Modelling, Data-driven Threshold, Supply Chain Network Configuration
National Category
Business Administration
Identifiers
urn:nbn:se:hb:diva-22955 (URN)
Conference
21st International Working Seminar on Production Economics, Innsbruck, February 24-28, 2020.
Available from: 2020-03-04 Created: 2020-03-04 Last updated: 2020-03-04Bibliographically approved
Siddharth, S., Kumar, V., Kameswara Rao, P., Sharma, S., Sebők, D., Szenti, I., . . . Kukovecz, A. (2020). Probing the three-dimensional porous and tortuous nature of absorptive glass mat (AGM) separators. Journal of Energy Storage, 2017(101003)
Open this publication in new window or tab >>Probing the three-dimensional porous and tortuous nature of absorptive glass mat (AGM) separators
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2020 (English)In: Journal of Energy Storage, E-ISSN 2352-152X, Vol. 2017, no 101003Article in journal (Refereed) Published
Abstract [en]

The valve regulated lead acid (VRLA) battery is a predominant electrochemical storage system that stores energy in a cheap, reliable and recyclable manner for innumerable applications. The absorptive glass mat (AGM) separator is a key component, which is pivotal for the successful functioning of the VRLA battery. Herein, the intricate three-dimensional (3D) porous structure of AGM separators has been unveiled using X-ray micro-computed tomography (microCT) analysis. X-ray microCT has quantified a variety of fiber and structural parameters including fiber orientation, porosity, tortuosity, pore size distribution, pore interconnectivity and pore volume distribution. A predictive model of hydraulic tortuosity has been developed based upon some of these fiber and structural parameters. Moreover, the pore size distribution extracted via X-ray microCT analysis has served as a benchmark for making a comparison with the existing analytical model of the pore size distribution of AGM separators. Pore size distributions obtained via the existing analytical model and through X-ray microCT analysis are in close agreement.

Keywords
Fiber orientation, Separator, Pore size, Tortuosity, Porosity
National Category
Textile, Rubber and Polymeric Materials
Identifiers
urn:nbn:se:hb:diva-22224 (URN)10.1016/j.est.2019.101003 (DOI)
Available from: 2019-12-18 Created: 2019-12-18 Last updated: 2020-01-07Bibliographically approved
Agrawal, T. K., Kumar, V. & Pal, R. (2019). Blockchain-Based Framework for Traceability – A Case Example of Nonwoven Supply Chain. In: EDANA-Nonwovens Innovation Academy 2019: . Paper presented at The Nonwovens Innovation Academy 2019, DITF - Denkendorf (Germany), October 16-17, 2019.
Open this publication in new window or tab >>Blockchain-Based Framework for Traceability – A Case Example of Nonwoven Supply Chain
2019 (English)In: EDANA-Nonwovens Innovation Academy 2019, 2019Conference paper, Poster (with or without abstract) (Refereed)
Abstract [en]

Supply chain traceability has emerged as a prime requirement for multi-tier supply chains. It not only enables the supply chain visibility but also caters to the consumer requirements related to transparency, quality assurance, and production tracking. Nonwoven supply chain is one such example that particularly requires traceability implementation due to prevailing problems related to information asymmetry and complex supply chain networks. Conversely, it is challenging for supply chain partners to share all the competitive information in the unsecure environment. In this context, in line with Industry 4.0, this study investigates blockchain technology, which uses a shared and secured data infrastructure to keep track of information about assets and requires no central authority to function. It further proposes a blockchain-based traceability framework that explains supply chain partner interaction and network architecture at organizational level and smart contract and transaction validation rules at the operational level. In order to illustrate the application of the framework, the study presents an example of a nonwoven supply chain to track the nonwoven manufacturing and distribution processes. The proposed system can build a technology-based trust among the supply chain actors, where the distributed ledger would be used to store and authenticate of supply chain transactions.

Keywords
Blockchain, Traceability, Nonwoven, Supply chain, Security
National Category
Economics and Business Computer Systems Other Electrical Engineering, Electronic Engineering, Information Engineering
Research subject
Textiles and Fashion (General); Business and IT
Identifiers
urn:nbn:se:hb:diva-21900 (URN)
Conference
The Nonwovens Innovation Academy 2019, DITF - Denkendorf (Germany), October 16-17, 2019
Projects
SMDTex
Available from: 2019-10-28 Created: 2019-10-28 Last updated: 2019-10-29Bibliographically approved
Pal, R., Kumar, V., Agrawal, T. K., Dani, S. & Gunalay, Y. (2019). Blockchain-based traceability for fashion apparel supply chains. In: : . Paper presented at Production and Operations Management Society (POMS) International Conference. Brighton, UK
Open this publication in new window or tab >>Blockchain-based traceability for fashion apparel supply chains
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2019 (English)Conference paper, Oral presentation only (Other academic)
Abstract [en]

The fashion industry is often criticised for lack of traceability. This paper explores the implementation of traceability in the fashion supply chain using blockchain technology (BT). Using a demonstrative simulation we identify what are the sector-specific requirements, main procedures (i.e. smart-contract rules), and how to use them for BT-based traceability.

Place, publisher, year, edition, pages
Brighton, UK: , 2019
National Category
Information Systems Economics and Business
Research subject
Textiles and Fashion (General); Business and IT
Identifiers
urn:nbn:se:hb:diva-21872 (URN)
Conference
Production and Operations Management Society (POMS) International Conference
Projects
SMDTex
Available from: 2019-10-20 Created: 2019-10-20 Last updated: 2019-10-29Bibliographically approved
Harper, S., Pal, R. & Kumar, V. (2019). Supply network configuration and capabilities for high-cost, small series textile/apparel: A TISM approach. In: EurOMA 2019 Proceedings: . Paper presented at 26th International EurOMA Conference, Helsinki, June 17-19, 2019..
Open this publication in new window or tab >>Supply network configuration and capabilities for high-cost, small series textile/apparel: A TISM approach
2019 (English)In: EurOMA 2019 Proceedings, 2019Conference paper, Published paper (Refereed)
Abstract [en]

The increasing emphasis on small series production in higher cost locations is particularly challenging in the textile/apparel industry due to global supply chain configurations. To support (re)configuration in this context, Total interpretive structural modelling (TISM) method is used to gain a deeper understanding of the inter-relationships among configuration/capability related aspects from the literature. TISM interviews were done with 24 industry practitioners producing/sourcing in the EU, or in the process of implementation. The findings validate extensive inter-relations, at the same time highlighting relational aspects, internal integration, and quality as significant drivers. Further in-depth research is required to understand these influences.

Keywords
Supply network configuration, Total interpretive structural model, textile and apparel industry
National Category
Economics and Business
Research subject
Textiles and Fashion (General)
Identifiers
urn:nbn:se:hb:diva-22033 (URN)
Conference
26th International EurOMA Conference, Helsinki, June 17-19, 2019.
Projects
Fashion Big Data Business Model
Funder
EU, Horizon 2020, 761122
Available from: 2019-11-15 Created: 2019-11-15 Last updated: 2019-12-19Bibliographically approved
Agrawal, T. K., Sharma, A. & Kumar, V. (2018). Blockchain-Based Secured Traceability System for Textile and Clothing Supply Chain. In: Sébastien Thomassey, Xianyi Zeng (Ed.), Artificial Intelligence for Fashion Industry in the Big Data Era: (pp. 197-208). Singapore: Springer Publishing Company
Open this publication in new window or tab >>Blockchain-Based Secured Traceability System for Textile and Clothing Supply Chain
2018 (English)In: Artificial Intelligence for Fashion Industry in the Big Data Era / [ed] Sébastien Thomassey, Xianyi Zeng, Singapore: Springer Publishing Company, 2018, p. 197-208Chapter in book (Refereed)
Abstract [en]

Blockchain has emerged as a prominent and reliable solution that can enable and ensure secure information sharing over wide area networks. In an era of digitalisation, blockchain technology is finding wide applications in multiple fields including implementing traceability in the supply chain. In this direction, this chapter explores its potential application in implementing a blockchain-based traceability system for textile and clothing (T&C) supply chain. It examines the necessity and concept of a traceability system, followed by enlisting advantages of blockchain technology for implementing traceability. Further, a case-based example has been used to explain blockchain application in implementing traceability in T&C supply chain. Finally, it mentions the challenges and limitations of such blockchain-based traceability system that can be addressed through further research.

Place, publisher, year, edition, pages
Singapore: Springer Publishing Company, 2018
Series
Springer Series in Fashion Business, ISSN 2366-8776, E-ISSN 2366-8784 ; 15202
Keywords
Blockchain, Traceability, Supply Chain, Textile and clothing
National Category
Business Administration
Research subject
Textiles and Fashion (General)
Identifiers
urn:nbn:se:hb:diva-15067 (URN)10.1007/978-981-13-0080-6 (DOI)978-981-13-0079-0 (ISBN)978-981-13-0080-6 (ISBN)
Projects
SMDTex (Sustainable Management and Design in Textiles)
Available from: 2018-09-06 Created: 2018-09-06 Last updated: 2018-09-06Bibliographically approved
Kumar, V., Rao, P. K. & Rawal, A. (2017). Amplification of electrolyte uptake in the absorptive glass mat (AGM)separator for valve regulated lead acid (VRLA) batteries. Journal of Power Sources, 341, 19-26
Open this publication in new window or tab >>Amplification of electrolyte uptake in the absorptive glass mat (AGM)separator for valve regulated lead acid (VRLA) batteries
2017 (English)In: Journal of Power Sources, ISSN 0378-7753, E-ISSN 1873-2755, Vol. 341, p. 19-26Article in journal (Refereed) Published
Abstract [en]

Absorptive glass mat (AGM) separators are widely used for valve regulated lead acid (VRLA) batteries due to their remarkable fiber and structural characteristics. Discharge performance and recharge effectiveness of VRLA batteries essentially rely on the distribution and saturation levels of the electrolyte within the AGM separator. Herein, we report an analytical model for predicting the wicking characteristics of AGM battery separators under unconfined and confined states. The model of wicking behavior of AGM is based upon Fries and Dreyer's approach that included the effect of gravity component which was neglected in classic Lucas-Washburn's model. In addition, the predictive model of wicking accounted for realistic structural characteristics of AGM via orientation averaging approach. For wicking under confined state, the structural parameters have been updated under defined level of compressive stresses based upon the constitutive equation derived for a planar network of fibers in AGM under transverse loading conditions. A comparison has been made between the theoretical models and experimental results of wicking behavior under unconfined and confined states. Most importantly, the presented work has highlighted the questionable validity of classic Lucas-Washburn model for predicting the wicking characteristics of AGM separator over longer time duration.

Keywords
Fiber orientation, Compression, Separator, Wicking
National Category
Materials Engineering
Identifiers
urn:nbn:se:hb:diva-11376 (URN)10.1016/j.jpowsour.2016.11.027 (DOI)000393003400003 ()2-s2.0-84999287077 (Scopus ID)
Available from: 2016-12-13 Created: 2016-12-13 Last updated: 2018-11-28Bibliographically approved
Kumar, V., Koehl, L., Zeng, X. Z. & Ekwall, D. (2017). Coded yarn based tag for tracking textile supply chain. Journal of manufacturing systems, 42, 124-139
Open this publication in new window or tab >>Coded yarn based tag for tracking textile supply chain
2017 (English)In: Journal of manufacturing systems, ISSN 0278-6125, E-ISSN 1878-6642, Vol. 42, p. 124-139Article in journal (Refereed) Published
Abstract [en]

Traceability has gained considerable attention to facilitate monitored production, product recall, safety and reverse supply chain activities, in recent years. Traceability in manufacturing and distribution involves the use of tracking tags which are attached to the products; consequently, the products are tracked by recording the identity of attached tracking tags in the supply chain. In this context, this paper introduces a new yarn coding-based tracking tag which is fully integrated into textile for tracking the textile supply chain. The new tracking tag involves the use of special yarns which act as information carrier and basic unit of the tracking tag. An implementation scenario is discussed to use the designed tracking tag to monitor the production and authentication purposes. Real prototypes of the fully integrated coded yarn based textile tags are demonstrated in woven and knitted structures and analysed under the effect of washing treatments to simulate realistic conditions. Further, an image pattern recognition based algorithm has been introduced and analysed to extract the information encoded in the tag using coded yarns.

Keywords
Tracking tag, Yarn tag, Traceability, Yarn coding, Image pattern recognition
National Category
Materials Engineering
Research subject
Textiles and Fashion (General)
Identifiers
urn:nbn:se:hb:diva-11534 (URN)10.1016/j.jmsy.2016.11.008 (DOI)000394077400010 ()
Available from: 2016-12-29 Created: 2016-12-29 Last updated: 2018-11-29Bibliographically approved
Rao, P. V., Rawal, A., Kumar, V. & Rajput, K. G. (2017). Compression-recovery model of absorptive glass mat (AGM) separator guided by X-ray micro-computed tomography analysis. Journal of Power Sources, 365, 389-398
Open this publication in new window or tab >>Compression-recovery model of absorptive glass mat (AGM) separator guided by X-ray micro-computed tomography analysis
2017 (English)In: Journal of Power Sources, ISSN 0378-7753, E-ISSN 1873-2755, Vol. 365, p. 389-398Article in journal (Refereed) Published
Abstract [en]

Absorptive glass mat (AGM) separators play a key role in enhancing the cycle life of the valve regulated lead acid (VRLA) batteries by maintaining the elastic characteristics under a defined level of compression force with the plates of the electrodes. Inevitably, there are inherent challenges to maintain the required level of compression characteristics of AGM separators during the charge and discharge of the battery. Herein, we report a three-dimensional (3D) analytical model for predicting the compression-recovery behavior of AGM separators by formulating a direct relationship with the constituent fiber and structural parameters. The analytical model of compression-recovery behavior of AGM separators has successfully included the fiber slippage criterion and internal friction losses. The presented work uses, for the first time, 3D data of fiber orientation from X-ray micro-computed tomography, for predicting the compression-recovery behavior of AGM separators. A comparison has been made between the theoretical and experimental results of compression-recovery behavior of AGM samples with defined fiber orientation characteristics. In general, the theory agreed reasonably well with the experimental results of AGM samples in both dry and wet states. Through theoretical modeling, fiber volume fraction was established as one of the key structural parameters that modulates the compression hysteresis of an AGM separator.

Place, publisher, year, edition, pages
Elsevier, 2017
Keywords
Compression, Recovery, Separator, X-ray micro-computed tomography
National Category
Textile, Rubber and Polymeric Materials
Research subject
Textiles and Fashion (General)
Identifiers
urn:nbn:se:hb:diva-12705 (URN)10.1016/j.jpowsour.2017.08.055 (DOI)000412379200047 ()2-s2.0-85028966112 (Scopus ID)
Available from: 2017-09-21 Created: 2017-09-21 Last updated: 2018-11-29Bibliographically approved
Kumar, V., Agrawal, T. K., Wang, L. & Chen, Y. (2017). Contribution of traceability towards attaining sustainability in the textile sector. Textiles and Clothing Sustainability, 3(5)
Open this publication in new window or tab >>Contribution of traceability towards attaining sustainability in the textile sector
2017 (English)In: Textiles and Clothing Sustainability, ISSN 2197-9936, Vol. 3, no 5Article in journal (Refereed) Published
Abstract [en]

Sustainability is a widely recognized concern and priority for healthy growth of the society and for preservation of the planet. Concerning this, textile sector has seen an unprecedented demand for sustainable products from the consumers, responding to which organizations have undertaken different initiatives. One of the major concerns in the textile sector is its complex supply chain networks and the involvement of numerous actors dealing with diverse raw materials and operations. The effective implementation of sustainability at the industrial scale would require the participation of all supply chain actors, along with an efficient traceability system to monitor and analyze different sustainability aspects. Furthermore, traceability is an integral part of the recycling process which contributes towards the sustainability. Therefore, the present article focuses on the contribution of traceable information towards attaining the sustainability in the textile sector. The three pillars of sustainability, namely, ecological, societal, and economic, are discussed for their relation and dependency on the traceability followed by an overview of the challenges in successful implementation of the traceability system, which is anticipated to shape the future research questions.

National Category
Business Administration
Research subject
Textiles and Fashion (General); Textiles and Fashion (General)
Identifiers
urn:nbn:se:hb:diva-12181 (URN)10.1186/s40689-017-0027-8 (DOI)
Available from: 2017-05-28 Created: 2017-05-28 Last updated: 2017-12-15Bibliographically approved
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0002-9955-6273

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