| 1. |
- Gustavsson, Patrik, 1988-
(författare)
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Virtual Reality Platform for Design and Evaluation of the Interaction in Human-Robot Collaborative Tasks in Assembly Manufacturing
- 2020
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Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
- Industry is on the threshold of the fourth industrial revolution where smart factories area necessity to meet customer demands for increasing volumes of individualized products. Within the smart factory, cyber-physical production systems are becoming important to deal with changing production. Human-robot collaboration is an example of a cyber-physical system in which humans and robots share a workspace. By introducing robots and humans into the same working cell, the two can collaborate by allowing the robot to deal with heavy lifting, repetitive, and high accuracy tasks, while the human focuses on tasks that need intelligence, flexibility, and adaptability. There are few such collaborative applications in industry today. In the implementations that actually exist, the robots are mainly working side-by-side with humans rather than truly collaborating. Three main factors that limit the widespread application of human-robot collaboration can be identified: lack of knowledge regarding suitable human-robot collaboration tasks, lack of knowledge regarding efficient communication technologies for enabling interaction between humans and robots when carrying out tasks, and lack of efficient ways to safely analyze and evaluate collaborative tasks.The overall aim of this thesis is to address these problems and facilitate and improve interaction between humans and robots, with a special focus on assembly manufacturing tasks. To fulfill this aim, an assembly workstation for human-robot collaboration has been developed and implemented both physically and virtually. A virtual reality platform called ViCoR has been developed that can be used to investigate, evaluate, and analyze the interaction between humans and robots and thereby facilitate the implementation of new human-robot collaboration cells. The workstation developed has also been used for data collection and experiments during the thesis work, and used to extract knowledge of how the interaction between human and robot can be improved.
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| 2. |
- Kurdve, Martin, et al.
(författare)
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Production System Change Strategy in Lightweight Manufacturing
- 2016
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Ingår i: Procedia CIRP. - : Elsevier BV. - 2212-8271. ; , s. 160-165
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Konferensbidrag (refereegranskat)abstract
- Two change management strategies: a minimum change, exploitation strategy (kaizen) and a maximum output, exploration strategy (kaikaku) have been applied in a manufacturing case study. Value stream mapping and discrete event simulation were used to analyse the production system changes, with regards to robustness and total lead-time, to increase knowledge of how to choose change management strategy. The results point out that available time is crucial. It is important to consider not only product specification and return of investment, but also the change and risk management. Future research should develop engineering change management further.
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| 3. |
- Abid, Muhammad, 1981-
(författare)
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Global Supply Chain Design : Exploring configurational and coordination factors
- 2015
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Licentiatavhandling (övrigt vetenskapligt/konstnärligt)abstract
- This thesis addresses the topic of global supply chain design. One major challenge concerns how to manage the tension between separation and integration pertaining to the localization of business activities. In this regard Ferdows (2008) worked to create two new production network models (rooted production network and footloose production network). Earlier studies have highlighted the choices that are involved in the network of facilities but lack in providing a comprehensive picture in terms of both configurational and coordination factors that govern the design of global supply chain. There is a need for a conceptual model where factors affecting the design process of a global supply chain can be applied. Two main research questions have been addressed in this study. First, exploring and identifying the factors affecting global supply chain design. Second, investigating the factors that influence the position on the spectrum of rooted and footloose supply chain design. A literature review analysis and multi-case studies have been performed for this study in order to explore the factors. The companies were selected in order to reflect upon the two types of network, i.e., rooted and footloose. The primary data were selected through interviews with the managers.This study highlighted that there are many factors that affect configurational and coordination decision areas within a global supply chain. This study categorized the factors and the configurational/coordination decision areas with two main competitive priorities, i.e., cost and differentiation in the form of a “conceptual model.” The study also highlighted the factors in a matrix, which showed their position on the spectrum of rooted and footloose network configurations. For instance, the coordination factors that drive towards a footloose network include: high orchestration capabilities, need access to new technology and knowledge, proximity to suppliers, etc. The configurational factors that drive towards a rooted network include: economic stability, proximity to market, concerns for sustainability issues, high transportation cost, need for high proximity between key functions, need for intellectual property rights protection, etc.
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| 4. |
- Agrawal, Tarun Kumar, et al.
(författare)
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Blockchain-Based Secured Collaborative Model for Supply Chain Resource Sharing and Visibility
- 2020
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Ingår i: IFIP Advances in Information and Communication Technology. - Cham : Springer. ; , s. 259-266
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Konferensbidrag (refereegranskat)abstract
- Globalization, escalating competition, and demand for sustainable practices have required supply chain and production managers to consider various capabilities and value creation strategies for the customers. Rapid technological advancement in the current production environment calls for integrative and collaborative efforts for effective resource utilization and better visibility to gain competitive advantages. However, privacy risks and trust have always been a significant barrier for organizations’ efforts towards supply chain integration. Supply chain stakeholders fear these collaborate practices might weaken their bargaining power, accelerate risk of data manipulation and result in loss of information advantages. Addressing these issues, the study proposes a Blockchain-based collaborative model for production visibility and resource sharing. It demonstrates the framework for stakeholders’ interaction over a central procurement system backed with blockchain technology. The study further lays down the notion of production capacity backed smart contract rules. These smart contracts will run on the proposed blockchain network to reduce the possibilities of fraudulent transactions and capacity overbooking- leading to illegitimate subcontracting. The overall network will stimulate visibility and develop a technology-based trust among partners which ensuring sustainability by effective utilization of resources.
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| 5. |
- Agrawal, Tarun Kumar, et al.
(författare)
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Demonstration of a blockchain-based framework using smart contracts for supply chain collaboration
- 2023
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Ingår i: International Journal of Production Research. - : Informa UK Limited. - 0020-7543 .- 1366-588X. ; 61:5, s. 1497-1516
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Tidskriftsartikel (refereegranskat)abstract
- Blockchain technologies can support traceability, transparency and trust among participants. This has primarily been explored in established supply chains and not in the growing use of business networks or ecosystems, which is a notable limitation since supply chains typically are organised with a dominant actor that ensures common information systems and standards that negate blockchain benefits. Hence, this study explores the design of a blockchain-based collaborative framework for resource sharing using smart contracts. These are particularly well-suited for supporting operations in broader networks or ecosystems beyond supply chains with established collaborations and hierarchies. Based on a systematic literature review, a demonstrator framework was developed for stakeholder interactions through a procurement and distribution unit backed with blockchain technology. The framework consists of (a) network architecture to demonstrate partner interactions; (b) rules for network working principles based on supply collaboration requirements; (c) UML diagram to define smart contract interaction sequence; and (d) algorithm for smart contract network verification and validation. Applicability of these smart contracts was verified by deployment on an Ethereum blockchain. The demonstrator framework ensures quality and data authenticity in supply networks, so it is useful for effective resource utilisation in networks where outsourcing and production surpluses are major issues.
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| 6. |
- Agrawal, Tarun Kumar, et al.
(författare)
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Enabling circularity of electric vehicle batteries-the need for appropriate traceability
- 2021
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Ingår i: 2021 IEEE International Conference on Technology Management, Operations and Decisions, ICTMOD 2021. - : Institute of Electrical and Electronics Engineers (IEEE).
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Konferensbidrag (refereegranskat)abstract
- With the increased electrification of transportation, there is a growth in the number of electric vehicles (EV) in use, and hence also discarded EV batteries. It is critical to trace the batteries so that the policy of electrification does not lead to a negative impact on sustainability. To achieve the goals of circular economy, it is necessary to consider the sustainable extended life cycle strategies of reduce, reuse and recycle. Information gathering and sharing through the supply chain is the key driver for enabling the tracking and tracing of materials and services needed. Traceability indicators across the value chain may enable the creation of a comprehensive database that aids the circular economy goals. In this study, we discuss three different circular economy business models and identify the key traceability indicators for enabling circularity in the lithium-ion battery application in the automotive sector. Insights are used to develop a framework for viable EV battery circularity, capturing three key circular economy elements and four traceability characteristics for different circularity types.
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| 7. |
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| 8. |
- Agrawal, Tarun Kumar, 1989-, et al.
(författare)
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Understanding Supply Chain Visibility Through Experts’ Perspective: A Delphi Based Approach
- 2021
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Ingår i: Advances in Production Management Systems. Artificial Intelligence for Sustainable and Resilient Production Systems. - Cham : Springer Nature. ; 633 IFIP, s. 189-196
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Konferensbidrag (refereegranskat)abstract
- Visibility in production logistics and across the supply chain has become a key concern for organizations. Its need has been further emphasized due to the current COVID 19 crisis. Organizations find it challenging to prepare the internal logistics and supply chain, and quickly respond to such unexpected events, due to low visibility. Against this backdrop, the paper, which is a work-in-progress, systematically documents different factors influencing supply chain visibility and crucial information that should be collected and shared among supply chain partners for better visibility. A Delphi analysis is being conducted with twenty-six supply chain experts from various globally recognized enterprises with manufacturing units located worldwide. The study starts with a short open-ended questioner to collect a comprehensive list of antecedents, drivers, barriers, effects, and visibility information based on the qualitative response from the experts. The preliminary results from the first round of the Delphi analysis indicate that risk management, environmental sustainability, and supply chain control are some of the key drivers. Lack of IT infrastructure and maturity are some of the barriers, integrated systems, and technology maturity are among the key antecedents and gaining planning capability and better customer service are some of the positive effects of supply chain visibility as per the experts’ opinion. In addition, information related to planning, supplier location, and deviation are among the crucial ones that require the collection and sharing for better supply chain visibility. This research study is among the few that empirically explores factors influencing supply chain visibility and generates new insights as to why the barriers can be difficult to overcome in complex supply chain settings.
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| 9. |
- Agrawal, Tarun, 1989, et al.
(författare)
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Supply chain visibility: A Delphi study on managerial perspectives and priorities
- 2022
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Ingår i: International Journal of Production Research. - : Informa UK Limited. - 0020-7543 .- 1366-588X. ; 62:8, s. 2927-2942
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Tidskriftsartikel (refereegranskat)abstract
- Visibility across supply chains has been a key concern for organisations for many years, but the tools and information systems to achieve real-time visibility have not been available until recently. In response to uncertainty and complexity, advanced information and communication technologies have been explored for supply chain visibility (SCV). However, managerial perspectives are largely absent from the current literature. In response, this paper systematically documents managerial factors influencing SCV and information that should be collected and shared among supply chain partners for better visibility. A multi-stage Delphi analysis was conducted with 26 supply chain experts from various globally recognised enterprises with manufacturing units located worldwide. The results provide details on prioritised managerial perspectives and experiences within (1) factors affecting SCV (drivers, enablers, challenges and contingencies), (2) SCV content (supplier, internal and customer information) and (3) implications of SCV (capabilities and performance effects). One observation was that forecasting is not deemed as important due to severe disruptions in supply chains. Real-time visibility for better predictability emerged as the top priority. This study is among the few that empirically explores factors influencing supply chain visibility and generates new insights into why barriers can be difficult to overcome in complex supply chain settings.
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| 10. |
- Ai Jun, Hou, et al.
(författare)
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Variance based efficiency test of OMX index option markat
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Ingår i: European Journal of Finance. - 1351-847X .- 1466-4364.
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Tidskriftsartikel (refereegranskat)abstract
- n this paper, followed by the market efficiency definition of the absence of arbitrage opportunity in the market, we test the market efficiency of the OMXS30 index option market.We first check the arbitrage opportunity by examining the boundary conditions and thePut Call Parity that must be satisfied in the market. Then a variance based efficiency test is performed by establishing arisk neutral portfolio and re-balancing the initial portfolio in different trading strategies. In order to choose the most appropriate model for option price and hedging strategies, we calibrate several most applied models, i.e. the Black Scholes, Merton, Heston, Bates, and Affine Jump Diffusion models. Our results indicate that the Affine Jump Diffusion model significantly outperforms other models in the option price forecast and the trading strategies. Both the boundary and the Put Call Parity tests and the dynamic hedging strategy give evidence that no significant abnormal returns can be obtained in the OMXS30 option market, thereby supporting the market efficiency.
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