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Izabela Nielsen
Department of Materials and Production, Aalborg University, 9220 Aalborg, Denmark

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Journal article
Published: 13 August 2021 in Applied Sciences
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Over the past decades, developments and scientific breakthroughs in the field of robotics have shown the replacement of wheeled robots with legged robots, which are often inspired by the biological characteristics of legged animals. Many industries and urban-based applications promote quadruped robots because of their dexterous ability to efficiently handle multiple tasks in the working environment. Motivated from the recent works in the field of quadruped robots, this research aims to develop and investigate gaits for a 2 DoF mammal-inspired quadruped robot that incorporates 4 hip and 4 knee servo motors as its locomotion element. Forward and inverse kinematic techniques are used to determine the joint angle required for the locomotion and stability calculation are presented to determine the center of mass/center of gravity of the robot. Three types of gaits such as walk, trot, and pace are developed while keeping the center of mass inside the support polygon using a closed-loop control system. To minimize errors and improve the performance of the robot due to its non-linearity, a meta-heuristic algorithm has been developed and addressed in this work. The fitness function is derived based on the Euclidean distance between the target and robot’s current position and kinematic equations are used to obtain the relation between joints and coordinates. Based on the literature, particle swarm optimization (PSO) was found to be a promising algorithm for this problem and is developed using Python’s ‘Pyswarms’ package. Experimental studies are carried out quantitatively to determine the convergence characteristics of the control algorithm and to investigate the distance traveled by the robot for different target positions and gaits. Comparison between experimental and theoretical results prove the efficiency of the proposed algorithm and stability of the robot during various gait movements.

ACS Style

Taarun Srinivas; Adithya Krishna Karigiri Madhusudhan; Lokeshwaran Manohar; Nikhit Mathew Stephen Pushpagiri; Kuppan Chetty Ramanathan; Mukund Janardhanan; Izabela Nielsen. Valkyrie—Design and Development of Gaits for Quadruped Robot Using Particle Swarm Optimization. Applied Sciences 2021, 11, 7458 .

AMA Style

Taarun Srinivas, Adithya Krishna Karigiri Madhusudhan, Lokeshwaran Manohar, Nikhit Mathew Stephen Pushpagiri, Kuppan Chetty Ramanathan, Mukund Janardhanan, Izabela Nielsen. Valkyrie—Design and Development of Gaits for Quadruped Robot Using Particle Swarm Optimization. Applied Sciences. 2021; 11 (16):7458.

Chicago/Turabian Style

Taarun Srinivas; Adithya Krishna Karigiri Madhusudhan; Lokeshwaran Manohar; Nikhit Mathew Stephen Pushpagiri; Kuppan Chetty Ramanathan; Mukund Janardhanan; Izabela Nielsen. 2021. "Valkyrie—Design and Development of Gaits for Quadruped Robot Using Particle Swarm Optimization." Applied Sciences 11, no. 16: 7458.

Original paper
Published: 07 July 2021 in Operational Research
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This study explores two competing manufacturers’ green investment decisions with different market sizes in selling price- and green-level-differentiated substitutable green products through a retailer. Five game structures are considered in examining the impacts of power structures on the optimal price and green level decisions and the corresponding equilibrium decisions. A two-way revenue-sharing contract is proposed from the perspective of improving the performance of each member. Numerical experiments are conducted to illustrate the results and gain managerial insights for green product manufacturing and selling in a competitive market. The results demonstrate that the two competing manufacturers need to cooperate rather than compete if cross-price elasticity or the difference between market potentials is too high. In this scenario, the equilibrium outcome can outperform the overall green supply chain’s performance compared to those achieved under the Bertrand or Nash game. The retailer also receives benefits. Due to a higher variation in market size and price sensitivity, the retailer may receive higher profits under the manufacturer’s leadership and vice versa. Therefore, the results contradict the common consensus. Although greening levels remain higher if the retailer dominates or the members have equal power, every member can receive suboptimal profits in these scenarios. It is found that a two-way revenue-sharing contract mechanism based on product market sizes can improve the overall green supply chain’s performance and allocate profit surplus arbitrarily.

ACS Style

Subrata Saha; Zbigniew Banaszak; Grzegorz Bocewicz; Izabela Ewa Nielsen. Pricing and quality competition for substitutable green products with a common retailer. Operational Research 2021, 1 -34.

AMA Style

Subrata Saha, Zbigniew Banaszak, Grzegorz Bocewicz, Izabela Ewa Nielsen. Pricing and quality competition for substitutable green products with a common retailer. Operational Research. 2021; ():1-34.

Chicago/Turabian Style

Subrata Saha; Zbigniew Banaszak; Grzegorz Bocewicz; Izabela Ewa Nielsen. 2021. "Pricing and quality competition for substitutable green products with a common retailer." Operational Research , no. : 1-34.

Conference paper
Published: 09 June 2021 in Algorithms and Data Structures
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We consider a dynamic vehicle routing problem in which a fleet of vehicles delivers ordered services or goods to spatially distributed customers while moving along separate milk-run routes over a given periodically repeating time horizon. Customer orders and the feasible time windows for the execution of those orders can be dynamically revealed over time. The problem essentially entails the rerouting of routes determined in the course of their proactive planning. Rerouting takes into account current order changes, while proactive route planning takes into account anticipated (previously assumed) changes in customer orders. Changes to planned orders may apply to both changes in the date of services provided and emerging notifications of additional customers. The considered problem is formulated as a constraint satisfaction problem using the ordered fuzzy number (OFN) formalism, which allows us to handle the fuzzy nature of the variables involved, e.g., the timeliness of the deliveries performed, through an algebraic approach. The computational results show that the proposed solution outperforms the commonly used computer simulation methods.

ACS Style

Grzegorz Bocewicz; Izabela Nielsen; Czeslaw Smutnicki; Zbigniew Banaszak. Out-Plant Milk-Run-Driven Mission Planning Subject to Dynamic Changes of Date and Place Delivery. Algorithms and Data Structures 2021, 151 -167.

AMA Style

Grzegorz Bocewicz, Izabela Nielsen, Czeslaw Smutnicki, Zbigniew Banaszak. Out-Plant Milk-Run-Driven Mission Planning Subject to Dynamic Changes of Date and Place Delivery. Algorithms and Data Structures. 2021; ():151-167.

Chicago/Turabian Style

Grzegorz Bocewicz; Izabela Nielsen; Czeslaw Smutnicki; Zbigniew Banaszak. 2021. "Out-Plant Milk-Run-Driven Mission Planning Subject to Dynamic Changes of Date and Place Delivery." Algorithms and Data Structures , no. : 151-167.

Journal article
Published: 17 May 2021 in Electronics
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Unmanned aerial vehicles (UAVs) have been used extensively for search and rescue operations, surveillance, disaster monitoring, attacking terrorists, etc. due to their growing advantages of low-cost, high maneuverability, and easy deployability. This study proposes a mixed-integer programming model under a multi-objective optimization framework to design trajectories that enable a set of UAVs to execute surveillance tasks. The first objective maximizes the cumulative probability of target detection to aim for mission planning success. The second objective ensures minimization of cumulative path length to provide a higher resource utilization goal. A two-step variable neighborhood search (VNS) algorithm is offered, which addresses the combinatorial optimization issue for determining the near-optimal sequence for cell visiting to reach the target. Numerical experiments and simulation results are evaluated in numerous benchmark instances. Results demonstrate that the proposed approach can favorably support practical deployability purposes.

ACS Style

Subrata Saha; Alex Vasegaard; Izabela Nielsen; Aneta Hapka; Henryk Budzisz. UAVs Path Planning under a Bi-Objective Optimization Framework for Smart Cities. Electronics 2021, 10, 1193 .

AMA Style

Subrata Saha, Alex Vasegaard, Izabela Nielsen, Aneta Hapka, Henryk Budzisz. UAVs Path Planning under a Bi-Objective Optimization Framework for Smart Cities. Electronics. 2021; 10 (10):1193.

Chicago/Turabian Style

Subrata Saha; Alex Vasegaard; Izabela Nielsen; Aneta Hapka; Henryk Budzisz. 2021. "UAVs Path Planning under a Bi-Objective Optimization Framework for Smart Cities." Electronics 10, no. 10: 1193.

Original article
Published: 07 May 2021 in Toxicology and Environmental Health Sciences
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The main objectives of this research were to identify if the presence of the aquatic weed Pistia stratiotes in the medium could influence the growth of the fish Cyprinus carpio when chronically exposed to sub-lethal concentrations of Cu (0.05 and 0.1 mg/L) and Ni (0.5 and 1.0 mg/L) in the presence of the weed and to compare between effects of Cu and Ni. Experiments were conducted in cement tanks for 90 days. Accumulation of Cu and Ni in water, sediment, fish and weed was determined by Atomic Absorption Spectrophotometer at the end of the experiments. The data were taken as factors to evaluate the interaction between the treatments of metals and weed and their impact on the growth of the fish. Multiple quadratic regression models followed by surface response plots were used to evaluate the interactions and their effects on the growth of C. carpio. The results indicated that the presence of the weed could reduce the accumulation of Cu and Ni in the sediment and fish and thus could ameliorate the ill effects of these metals on the growth of the fish. But there was a difference in growth response between the metals. By using the quadratic polynomial regression model and the surface response plot, it was revealed that Cu produced more deleterious effects on the growth of C. carpio than Ni. The weed interacted better with Cu than Ni, but for both the metals, the weed failed to prevent adverse effects on the growth of fish at a higher concentration of the metals used. The quadratic polynomial regression model followed by the surface response plot is a powerful tool to analyze the interaction between the weed and the treatments of metals and to compare the adverse effects of Cu and Ni on the growth of C. carpio.

ACS Style

Anupam Ghosh; Anilava Kaviraj; Izabela Ewa Nielsen; Subrata Saha. A comparative evaluation of the effects of copper and nickel on the growth of the freshwater fish Cyprinus carpio and amelioration by Pistia stratiotes. Toxicology and Environmental Health Sciences 2021, 1 -12.

AMA Style

Anupam Ghosh, Anilava Kaviraj, Izabela Ewa Nielsen, Subrata Saha. A comparative evaluation of the effects of copper and nickel on the growth of the freshwater fish Cyprinus carpio and amelioration by Pistia stratiotes. Toxicology and Environmental Health Sciences. 2021; ():1-12.

Chicago/Turabian Style

Anupam Ghosh; Anilava Kaviraj; Izabela Ewa Nielsen; Subrata Saha. 2021. "A comparative evaluation of the effects of copper and nickel on the growth of the freshwater fish Cyprinus carpio and amelioration by Pistia stratiotes." Toxicology and Environmental Health Sciences , no. : 1-12.

Journal article
Published: 07 May 2021 in Sustainability
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Unmanned aerial vehicles (UAVs) create an interesting alternative for establishing more sustainable urban freight deliveries. The substitution of traditional trucks in the last-mile distribution by a UAV fleet can contribute to urban sustainability by reducing air pollution and increasing urban freight efficiency. This paper presents a novel approach to the joint proactive and reactive planning of deliveries by a UAV fleet. We develop a receding horizon-based approach to reactive, online planning for the UAV fleet’s mission. We considered the delivery of goods to spatially dispersed customers over an assumed time horizon. Forecasted weather changes affect the energy consumption of UAVs and limit their range. Therefore, consideration should be given to plans for follow-up tasks, previously unmet needs, and predictions of disturbances over a moving time horizon. We propose a set of reaction rules that can be encountered during delivery in a highly dynamic and unpredictable environment. We implement a constraint programming paradigm, which is well suited to cope with the nonlinearity of the system’s characteristics. The proposed approach to online reactive UAV routing is evaluated in several instances. The computational experiments have shown that the developed model is capable of providing feasible plans for a UAV fleet’s mission that are robust to changes in weather and customer’s orders.

ACS Style

Grzegorz Radzki; Izabela Nielsen; Paulina Golińska-Dawson; Grzegorz Bocewicz; Zbigniew Banaszak. Reactive UAV Fleet’s Mission Planning in Highly Dynamic and Unpredictable Environments. Sustainability 2021, 13, 5228 .

AMA Style

Grzegorz Radzki, Izabela Nielsen, Paulina Golińska-Dawson, Grzegorz Bocewicz, Zbigniew Banaszak. Reactive UAV Fleet’s Mission Planning in Highly Dynamic and Unpredictable Environments. Sustainability. 2021; 13 (9):5228.

Chicago/Turabian Style

Grzegorz Radzki; Izabela Nielsen; Paulina Golińska-Dawson; Grzegorz Bocewicz; Zbigniew Banaszak. 2021. "Reactive UAV Fleet’s Mission Planning in Highly Dynamic and Unpredictable Environments." Sustainability 13, no. 9: 5228.

Chapter
Published: 16 March 2021 in Developments in Advanced Control and Intelligent Automation for Complex Systems
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Today the concept of mass customization is becoming increasingly important for project-oriented companies manufacturing assembled products. Expectations imposed by mass customization challenges force producers to increase flexibility of exploited manufacturing systems. In turn, since systems flexibility assumes the possibility of its adaptation to the conditions and requirements set by implemented production orders, a reconfigurability understood as its ability to adjust the functionality and capacity at the correct level begins to play a key role. In this context our study considers a multi-item assembly system where in-plant transportation operations are organized in milk-run loops. Assuming that production flows both before and after the disturbance retain a cyclical nature, the considered problem boils down to whether there exist reroutings and reschedules enabling transition from one cyclical production run to a new one determined after the disturbance occurrence or not. In other words, assuming a given structure of a milk-run serviced multi-item production system as well as specifications of production orders implemented in it, the sufficient conditions guaranteeing transitions between different cyclic steady states following order sets flow are sought. The purpose of this research is to develop a declarative model and a heuristic approach which are used to define and evaluate the reconfigurability level of the considered production system. The feasibility of the proposed method of production flow re-planning is analyzed for its computational complexity and evaluated through many numerical experiments. Presented results of conducted experiments demonstrate the system-wide performance benefits of simultaneous logistic trains rerouting and rescheduling, compared to commonly used sequential trains fleet rerouting and rescheduling approaches. Outcomes from this study provide an approach to avoid time consuming computer simulation-based calculations of logistic trains routing and scheduling, aimed at updating the production flow plan adapting it to changes forced by introducing new orders and/or damage to the transport sectors.

ACS Style

Grzegorz Bocewicz; Izabela Nielsen; Zbigniew Banaszak. Rerouting and Rescheduling of In-Plant Milk Run Based Delivery Subject to Supply Reconfigurability Constraints. Developments in Advanced Control and Intelligent Automation for Complex Systems 2021, 55 -78.

AMA Style

Grzegorz Bocewicz, Izabela Nielsen, Zbigniew Banaszak. Rerouting and Rescheduling of In-Plant Milk Run Based Delivery Subject to Supply Reconfigurability Constraints. Developments in Advanced Control and Intelligent Automation for Complex Systems. 2021; ():55-78.

Chicago/Turabian Style

Grzegorz Bocewicz; Izabela Nielsen; Zbigniew Banaszak. 2021. "Rerouting and Rescheduling of In-Plant Milk Run Based Delivery Subject to Supply Reconfigurability Constraints." Developments in Advanced Control and Intelligent Automation for Complex Systems , no. : 55-78.

Journal article
Published: 27 February 2021 in Mathematical Problems in Engineering
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This paper investigates the impact of the subsidy and horizontal strategic cooperation on a green supply chain where two competing manufacturers distribute substitutable green products through exclusive retailers. Models are formulated in three-stage game structures in five different scenarios, where the government organization determines optimal subsidy by pursuing social welfare maximization. Both manufacturers invest in improving green quality levels of products. The study aims to explore the advantage of vertical integration and strategic collusion from the perspective of green supply chain practice in the presence of subsidy. The key contributions from the present study indicate that under competition, members of both supply chains are able to receive higher profits through horizontal collusion, but green quality levels of the product remain suboptimal. If upstream manufacturers cooperate, government subsidy does not necessarily improve product quality level, and the amount of government expenditure increased substantially. By comparing outcomes where members are vertically integrated with scenarios where members make strategic collusion, we found that the former might outperform by later. Cross-price sensitivity appears as a significant parameter affecting supply chain members’ performance and the amount of government expenditure. Cooperation between members at the horizontal level is a more robust strategic measure than vertical integration if consumers are highly price-sensitive.

ACS Style

Subrata Saha; Izabela Nielsen; Shib Sankar Sana. Effect of Optimal Subsidy Rate and Strategic Behaviour of Supply Chain Members under Competition on Green Product Retailing. Mathematical Problems in Engineering 2021, 2021, 1 -23.

AMA Style

Subrata Saha, Izabela Nielsen, Shib Sankar Sana. Effect of Optimal Subsidy Rate and Strategic Behaviour of Supply Chain Members under Competition on Green Product Retailing. Mathematical Problems in Engineering. 2021; 2021 ():1-23.

Chicago/Turabian Style

Subrata Saha; Izabela Nielsen; Shib Sankar Sana. 2021. "Effect of Optimal Subsidy Rate and Strategic Behaviour of Supply Chain Members under Competition on Green Product Retailing." Mathematical Problems in Engineering 2021, no. : 1-23.

Journal article
Published: 31 December 2020 in Symmetry
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This study explores the pricing decisions of substitutable products for two competing supply chains in the presence of an online channel. Each supply chain consisting of a single manufacturer and an exclusive retailer and one of the manufacturers distributes products through the online channel. We examine optimal decisions under five scenarios to explore how the strategic cooperation between two manufacturers at the upstream horizontal level or with the retailer at the vertical level affects product pricing decisions and the performance of two supply chains? The results reveal that decisions for cooperation with competing manufacturers and opening an online channel are correlated. In the absence of an online channel, cooperation with their respective retailer can lead to a higher supply chain profit. However, if a manufacturer opens an online channel, then cooperation with competing manufacturers can lead to a higher supply chain profit. Under the vertical integration, total supply chain profit might be lower compared to a scenario where members in each supply chain remain independent. Consumers also need to pay more for products.

ACS Style

Subrata Saha; Izabela Nielsen. Strategic Integration Decision under Supply Chain Competition in the Presence of Online Channel. Symmetry 2020, 13, 58 .

AMA Style

Subrata Saha, Izabela Nielsen. Strategic Integration Decision under Supply Chain Competition in the Presence of Online Channel. Symmetry. 2020; 13 (1):58.

Chicago/Turabian Style

Subrata Saha; Izabela Nielsen. 2020. "Strategic Integration Decision under Supply Chain Competition in the Presence of Online Channel." Symmetry 13, no. 1: 58.

Articles
Published: 25 December 2020 in Journal of Information and Telecommunication
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Selection of competent employees is one of the numerous factors that determine the success of a project. The literature describes many approaches that help decision makers to recruit candidates with the required skills. Only a few of them consider the disruptions that can occur during the implementation of a project, such as employee absenteeism and fluctuations in the duration of activities, etc. Collectively, what these approaches amount to is proactive planning of employee teams with redundant competences. Searching for competence frameworks robust to disruptions involves time-consuming calculations, which do not guarantee that an admissible solution will be found. In view of this, in the present study, we propose sufficient conditions, the fulfilment of which guarantees the existence of such a solution. By testing these conditions, one can determine whether there exists an admissible solution, i.e. whether it is at all worth searching for a robust competence framework. The possibilities of practical application of the proposed method are illustrated with an example.

ACS Style

Eryk Szwarc; Izabela Nielsen; Czesław Smutnicki; Grzegorz Bocewicz; Zbigniew Banaszak; Jakub Bilski. Competence-oriented project team planning – university case study. Journal of Information and Telecommunication 2020, 1 -24.

AMA Style

Eryk Szwarc, Izabela Nielsen, Czesław Smutnicki, Grzegorz Bocewicz, Zbigniew Banaszak, Jakub Bilski. Competence-oriented project team planning – university case study. Journal of Information and Telecommunication. 2020; ():1-24.

Chicago/Turabian Style

Eryk Szwarc; Izabela Nielsen; Czesław Smutnicki; Grzegorz Bocewicz; Zbigniew Banaszak; Jakub Bilski. 2020. "Competence-oriented project team planning – university case study." Journal of Information and Telecommunication , no. : 1-24.

Journal article
Published: 08 December 2020 in Sustainability
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This study explores the optimal pricing and investment decision for two competing green supply chains, both consisting of a manufacturer and an exclusive retailer. Our focus is to explore, does the strategic integration decision with rivals at the horizontal level or with partners at the vertical level have any effect on green product types? The results reveal the following insights: retailer-retailer strategic integration at downstream level leads to a sub-optimal total supply chain profit and green quality level for a development-intensive green product. Two competing manufacturers can produce products at a higher level if they are vertically integrated with respective retailers. Manufacturer-manufacturer integration at upstream level sometimes leads to higher profits and product quality level if cross price-elasticity of consumers is high. However, an opposite phenomenon is observed while they are selling for a marginal-intensive green product, horizontal integration can improve green quality levels, but supply chain members will receive a lower profit. Therefore, selection of green product types and strategic integration decision are interrelated to achieve the profit maximization goal along with the aim to offer products at a higher green quality level. Vertical integration strategy can outperform horizontal integration strategy, especially if cross-price elastic for green products remain high.

ACS Style

Izabela Nielsen; Sani Majumder; Eryk Szwarc; Subrata Saha. Impact of Strategic Cooperation under Competition on Green Product Manufacturing. Sustainability 2020, 12, 10248 .

AMA Style

Izabela Nielsen, Sani Majumder, Eryk Szwarc, Subrata Saha. Impact of Strategic Cooperation under Competition on Green Product Manufacturing. Sustainability. 2020; 12 (24):10248.

Chicago/Turabian Style

Izabela Nielsen; Sani Majumder; Eryk Szwarc; Subrata Saha. 2020. "Impact of Strategic Cooperation under Competition on Green Product Manufacturing." Sustainability 12, no. 24: 10248.

Research article
Published: 06 August 2020 in Proceedings of the Zoological Society
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Optimum replacement of fishmeal (FM) is a challenge for scientists to develop low-cost feed for fish. In this study five experimental feeds were formulated by replacing 0 (control), 25, 50, 75 and 100% of FM by fermented animal protein blend (FAPB). Fingerlings of Mystus vittatus (average wt. 3.27 g) reared on these feeds for 12 weeks showed a significant reduction in growth and deposition of nutrients and amino acids in muscles in 100% replacement level, but exhibited an anomalous pattern of these parameters in other replacement levels. Multi-Objective Programming based on four growth parameters (weight gain, specific growth rate, feed conversion ratio, and protein efficiency ratio) produced optimum fishmeal replacement level (OFRL) as 38.43%, while it changed to 39.67% based on the growth parameters and crude protein (CP) and 51.22% based on the growth parameters, CP and crude lipid together. OFRL for maximum deposition of essential and non-essential amino acids (EAA & NAA) was found 31.54% and 51.32% respectively. Applying structural equation modeling we found that the histidine, lysine (EAA), aspartic acid and glycine (NAA) would produce negative effects on weight gain when FAPB was used as a FM replacer. While histidine was deficient, lysine, aspartic acid and glycine deposited in excess in muscle. It is concluded from this study that FM replacement level by FAPB in the diet of M. vittatus needs to be determined by considering the influence of CP, EAA and NAA to avoid excessive deposition of some amino acids and to obtain a compromise FM based on decision-makers goal.

ACS Style

Ayan Samaddar; Anilava Kaviraj; Izabela Ewa Nielsen; Subrata Saha. Replacement of Fishmeal by Fermented Animal Protein Blend in the Feed of Mystus vittatus: Analysis of Optimality By Programming and Modeling. Proceedings of the Zoological Society 2020, 74, 62 -72.

AMA Style

Ayan Samaddar, Anilava Kaviraj, Izabela Ewa Nielsen, Subrata Saha. Replacement of Fishmeal by Fermented Animal Protein Blend in the Feed of Mystus vittatus: Analysis of Optimality By Programming and Modeling. Proceedings of the Zoological Society. 2020; 74 (1):62-72.

Chicago/Turabian Style

Ayan Samaddar; Anilava Kaviraj; Izabela Ewa Nielsen; Subrata Saha. 2020. "Replacement of Fishmeal by Fermented Animal Protein Blend in the Feed of Mystus vittatus: Analysis of Optimality By Programming and Modeling." Proceedings of the Zoological Society 74, no. 1: 62-72.

Articles
Published: 11 June 2020 in International Journal of Production Research
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A declarative model is developed in this study. It allows us to formulate a constraint satisfaction problem that supports making decisions in the process of seeking a periodic distribution policy with a plan of whom to serve, how much to deliver, by which fleet of logistic trains travelling regularly, and on which routes. Implemented through a constrained, programming-driven solver, it allows for the formulation of forward and reverse milk-run vehicle routing and scheduling problems, subject to the constraints imposed by an in-plant distribution network. Consequently, it can be used to determine the number of transport trips and their organisation in time and space needed for the timely delivery of material to specific loading/unloading points. In this context, the proposed model meets the needs of an interactive search for solutions by the alternate and iterative formulation of successive forward and reverse decision problems.

ACS Style

Bocewicz Grzegorz; Nielsen Izabela; Gola Arkadiusz; Banaszak Zbigniew. Reference model of milk-run traffic systems prototyping. International Journal of Production Research 2020, 1 -18.

AMA Style

Bocewicz Grzegorz, Nielsen Izabela, Gola Arkadiusz, Banaszak Zbigniew. Reference model of milk-run traffic systems prototyping. International Journal of Production Research. 2020; ():1-18.

Chicago/Turabian Style

Bocewicz Grzegorz; Nielsen Izabela; Gola Arkadiusz; Banaszak Zbigniew. 2020. "Reference model of milk-run traffic systems prototyping." International Journal of Production Research , no. : 1-18.

Journal article
Published: 04 April 2020 in International Journal of Environmental Research and Public Health
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Efficient human resource deployment is one of the key aspects of road traffic management for maintaining the lifelines of any metropolitan city. The problem becomes relevant when collaboration between human resources with different skills in day-to-day operations is necessary to maintain public and commercial transport, manage various social events and emergency situations, and hence reduce congestion, injuries, emissions, etc. This study proposes a two-phase fuzzy multi-objective binary programming model for optimal allocation of five different categories of human resources to minimize the overall operational cost, maximize the allocation to accident-prone road segments, minimize the number of volunteer personnel and maximize the direct contact to reduce emissions and road traffic violations, simultaneously. A binary programming model is formulated to provide an efficient individual manpower allocation schedule for multiple road segments at different shifts. A case study is proposed for model evaluation and to derive managerial implications. The proposed model can be used to draw insights into human resource allocation planning in traffic management to reduce road traffic congestion, injuries and vehicular emissions.

ACS Style

Soumendra Nath Sanyal; Izabela Nielsen; Subrata Saha. Multi-Objective Human Resource Allocation Approach for Sustainable Traffic Management. International Journal of Environmental Research and Public Health 2020, 17, 2470 .

AMA Style

Soumendra Nath Sanyal, Izabela Nielsen, Subrata Saha. Multi-Objective Human Resource Allocation Approach for Sustainable Traffic Management. International Journal of Environmental Research and Public Health. 2020; 17 (7):2470.

Chicago/Turabian Style

Soumendra Nath Sanyal; Izabela Nielsen; Subrata Saha. 2020. "Multi-Objective Human Resource Allocation Approach for Sustainable Traffic Management." International Journal of Environmental Research and Public Health 17, no. 7: 2470.

Conference paper
Published: 04 March 2020 in Transactions on Petri Nets and Other Models of Concurrency XV
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The paper is concerned with using computational intelligence for identifying the relationships between variables and constraint programming for searching variants of completing a new product development project. The relationships are used to the cost estimation of new product development (NPD) and to the search for possible variants of reaching the desirable NPD cost. The main contribution of this paper is the use of constraint programming to a project prototyping problem in the context of product development. Moreover, the paper presents a method for estimating the NPD cost and searching variants that can ensure the desirable NPD cost. The project prototyping problem is formulated in terms of a constraint satisfaction problem and implemented using constraint programming techniques. These techniques enable declarative description of the considered problem and effective search strategies for finding admissible solutions. An example illustrates the applicability of the proposed approach for solving an NPD project prototyping problem.

ACS Style

Marcin Relich; Izabela Nielsen; Grzegorz Bocewicz; Zbigniew Banaszak. Constraint Programming for New Product Development Project Prototyping. Transactions on Petri Nets and Other Models of Concurrency XV 2020, 26 -37.

AMA Style

Marcin Relich, Izabela Nielsen, Grzegorz Bocewicz, Zbigniew Banaszak. Constraint Programming for New Product Development Project Prototyping. Transactions on Petri Nets and Other Models of Concurrency XV. 2020; ():26-37.

Chicago/Turabian Style

Marcin Relich; Izabela Nielsen; Grzegorz Bocewicz; Zbigniew Banaszak. 2020. "Constraint Programming for New Product Development Project Prototyping." Transactions on Petri Nets and Other Models of Concurrency XV , no. : 26-37.

Conference paper
Published: 04 March 2020 in Transactions on Petri Nets and Other Models of Concurrency XV
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Selection of competent employees is one of the numerous factors that determine the success of a project. The literature describes many approaches that help decision makers to recruit candidates with the required skills. Only a few of them take into account the disruptions that can occur during the implementation of a project, caused by employee absenteeism, fluctuations in the duration of activities, etc. Collectively, what these approaches amount to is proactive planning of employee teams with redundant competences. Searching for competence frameworks robust to disruptions involves time-consuming calculations, which do not guarantee that an admissible solution will be found. In view of this, in the present study, we propose sufficient conditions, the fulfilment of which guarantees the existence of such a solution. By testing these conditions, one can determine whether there exists an admissible solution, i.e. whether it is at all worth searching for a robust competence framework. The possibilities of practical application of the proposed method are illustrated with an example.

ACS Style

Eryk Szwarc; Izabela Nielsen; Czesław Smutnicki; Grzegorz Bocewicz. Competence-Oriented Recruitment of a Project Team Robust to Disruptions. Transactions on Petri Nets and Other Models of Concurrency XV 2020, 13 -25.

AMA Style

Eryk Szwarc, Izabela Nielsen, Czesław Smutnicki, Grzegorz Bocewicz. Competence-Oriented Recruitment of a Project Team Robust to Disruptions. Transactions on Petri Nets and Other Models of Concurrency XV. 2020; ():13-25.

Chicago/Turabian Style

Eryk Szwarc; Izabela Nielsen; Czesław Smutnicki; Grzegorz Bocewicz. 2020. "Competence-Oriented Recruitment of a Project Team Robust to Disruptions." Transactions on Petri Nets and Other Models of Concurrency XV , no. : 13-25.

Journal article
Published: 01 January 2020 in IFAC-PapersOnLine
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The paper is concerned with using constraint programming for simulating an alternative project completion of new product development (NPD). All possible variants of project completion are sought within the company’s resources and requirements for an NPD project. A company and its projects can be considered in terms of variables and constraints that constitute the systems approach for a project prototyping problem. This problem is described in the form of a constraint satisfaction problem and implemented with the use of constraint programming techniques. The paper also presents a method for estimating the NPD cost and unit production cost, and simulating variants that ensure the desirable level of costs, including the impact of granularity on the number of solutions. An example shows the applicability of the proposed approach in the context of NPD projects.

ACS Style

Marcin Relich; Izabela Nielsen; Grzegorz Bocewicz; Czeslaw Smutnicki; Zbigniew Banaszak. Declarative Modelling Approach for New Product Development. IFAC-PapersOnLine 2020, 53, 10525 -10530.

AMA Style

Marcin Relich, Izabela Nielsen, Grzegorz Bocewicz, Czeslaw Smutnicki, Zbigniew Banaszak. Declarative Modelling Approach for New Product Development. IFAC-PapersOnLine. 2020; 53 (2):10525-10530.

Chicago/Turabian Style

Marcin Relich; Izabela Nielsen; Grzegorz Bocewicz; Czeslaw Smutnicki; Zbigniew Banaszak. 2020. "Declarative Modelling Approach for New Product Development." IFAC-PapersOnLine 53, no. 2: 10525-10530.

Journal article
Published: 01 January 2020 in IFAC-PapersOnLine
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A fleet of homogeneous UAVs fly in a 2D plane matching a distribution network to service customers in a collision-free manner. Limited UAVs’ battery capacity and UAVs’ weight reduction during they traveling along planned routes and goods delivery as well as changing weather conditions are also taken into account. The goal is to determine a set of routings covering all delivery points so that the total distance traveled by the UAVs fleet is constrained by a battery capacity limit. All customers’ demands are realized within a given time horizon and take into account forecasted weather constraints, focusing on changes in a wind speed and direction. In this context, the main objective is to propose a declarative model allowing one to prototype proactive routings of UAVs fleet mission. Computational experiments assessing alternative strategies of UAVs fleet mission robust to forecast weather conditions are discussed.

ACS Style

Grzegorz Bocewicz; Grzegorz Radzki; Izabela Nielsen; Marcin Witczak; Banaszak Zbigniew. UAVs fleet mission planning robust to changing weather conditions. IFAC-PapersOnLine 2020, 53, 10518 -10524.

AMA Style

Grzegorz Bocewicz, Grzegorz Radzki, Izabela Nielsen, Marcin Witczak, Banaszak Zbigniew. UAVs fleet mission planning robust to changing weather conditions. IFAC-PapersOnLine. 2020; 53 (2):10518-10524.

Chicago/Turabian Style

Grzegorz Bocewicz; Grzegorz Radzki; Izabela Nielsen; Marcin Witczak; Banaszak Zbigniew. 2020. "UAVs fleet mission planning robust to changing weather conditions." IFAC-PapersOnLine 53, no. 2: 10518-10524.

Journal article
Published: 25 December 2019 in IFAC-PapersOnLine
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In the present study, a declarative model is developed which allows to formulate a constraint satisfaction problem that provides decision support for prototyping in-plant milk-run traffic systems. In particular, the model is used to determine the number of transport trips and their organization in time and space needed for timely delivery of material to specific loading/unloading points. Implemented in a constraints programming driven solver, it allows to formulate forward and reverse milk-run vehicle routing and scheduling problems subject to constraints imposed by an in-plant distribution network. In this context, our contribution can be seen as an alternative approach to DSS design, which allows one to search for solutions by alternate and iterative formulation of successive forward and reverse decision problems.

ACS Style

Grzegorz Bocewicz; Izabela Nielsen; Banaszak Zbigniew. A decision support model for prototyping in-plant milk-run traffic systems. IFAC-PapersOnLine 2019, 52, 814 -819.

AMA Style

Grzegorz Bocewicz, Izabela Nielsen, Banaszak Zbigniew. A decision support model for prototyping in-plant milk-run traffic systems. IFAC-PapersOnLine. 2019; 52 (13):814-819.

Chicago/Turabian Style

Grzegorz Bocewicz; Izabela Nielsen; Banaszak Zbigniew. 2019. "A decision support model for prototyping in-plant milk-run traffic systems." IFAC-PapersOnLine 52, no. 13: 814-819.

Journal article
Published: 23 December 2019 in Applied Sciences
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The pros and cons of government subsidy policies in a closed-loop supply chain (CLSC) setting on optimal pricing, investment decisions in improving product quality, and used product collection under social welfare (SW) optimization goal have not been examined comprehensively. This study compares the outcomes of three government policies under manufacturer-Stackelberg (MS) and retailer-Stackelberg (RS), namely (i) direct subsidy to the consumer, (ii) subsidy to the manufacturer to stimulate used product collection, and (iii) subsidy to the manufacturer to improve product quality. Results demonstrate that the greening level, used product collection, and SW are always higher under the RS game, but the rate of a subsidy granted by the government is always higher under the MS game. Profits for the CLSC members and SW are always higher if the government provides a subsidy directly to the consumer, but productivity of investment in the perspective of the manufacturer or government are less. In a second policy, the government organizations grant a subsidy to the manufacturer to stimulate used product collection, but it does not necessarily yield the desired outcome compared to others. In a third policy, the manufacturer receives a subsidy on a research and development (R&D) investment, but it yields a sub-optimal greening level. This study reveals that the outcomes of subsidy policies can bring benefit to consumers and add a degree of complication for CLSC members; government organizations need to inspect carefully among attributes, mainly product type, power of CLSC members, and investment efficiency for the manufacturer, before implementing any subsidy policies so that it can lead to an environmentally and economically viable outcome.

ACS Style

Izabela Ewa Nielsen; Sani Majumder; Subrata Saha. Game-Theoretic Analysis to Examine How Government Subsidy Policies Affect a Closed-Loop Supply Chain Decision. Applied Sciences 2019, 10, 145 .

AMA Style

Izabela Ewa Nielsen, Sani Majumder, Subrata Saha. Game-Theoretic Analysis to Examine How Government Subsidy Policies Affect a Closed-Loop Supply Chain Decision. Applied Sciences. 2019; 10 (1):145.

Chicago/Turabian Style

Izabela Ewa Nielsen; Sani Majumder; Subrata Saha. 2019. "Game-Theoretic Analysis to Examine How Government Subsidy Policies Affect a Closed-Loop Supply Chain Decision." Applied Sciences 10, no. 1: 145.