Browsing by Author "Vadivel, V."

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    Application of Multi-criteria Decision-Making Method for the Evaluation of Tamilnadu Private Bus Companies
    (Springer, 2020) Vadivel, V.; Sequeira, A.H.; Jauhar, S.K.; Baskaran, R.; Robert Rajkumar, S.
    The rapid growth of Tamilnadu sub-urban population has put enormous efforts on all modes of transportation systems, particularly the bus transportation. The increasing population far exceeds the limited supply of transport infrastructure and services. Mostly, traveling on a public bus and train services are overcrowded, undependable, slow, inconvenient, uncoordinated, and dangerous. Tamilnadu sub-urban desperately needs to improve and expand private transportation services to improve passengers’ satisfaction. In this paper, we have presented a multi-criteria decision-making approach for selecting the best private bus operators in Tamilnadu, the southern part of India. The evaluation has been made based on six criteria, twenty-eight sub-criteria, and eight private bus operators as alternatives. © 2020, Springer Nature Singapore Pte Ltd.
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    CNC Machine Shop Floor Facility Layout Design Using Genetic Algorithm
    (Springer, 2020) Vadivel, V.; Sequeira, A.H.; Jauhar, S.K.; Amirthagadeswaran, K.S.; Aravind Krishna, T.
    The facility layout is a well-planned process to assimilate equipment, human resources, and materials for processing a product most effectively. The facility layout problem (FLP) is an optimization problem that involves determining the shape and location of various departments within a facility, based on the inter-department distance and volume measures. CRAFT algorithm is one of the primary methods currently used for the optimization of facility layouts. The aim of this is analyzing and assessing various proposed layouts through this algorithm. The objective is to minimize the total layout cost. It depends on the material flow and distance between the departments. An attempt has also been made to optimize the layout through GA. © 2020, Springer Nature Singapore Pte Ltd.
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    Enhancement of mail operational performance of India post facility layout using AHP
    (Springer, 2020) Vadivel, V.; Sequeira, A.H.; Shetty, D.S.; Jauhar, S.K.
    The paper intends to evaluate the facility layout design (FLD) models using the analytical hierarchy process (AHP) method. FLD focuses on streamlining the workflow and increasing productivity. This study examines how the model can help to find out the optimum layout to improve the production metrics through improving operations and the working environment attributes. In this study, seven layout designs have been discussed under critical parameters of optimal layouts such as cost (operation and flexibility) and working environment (safety, facilities, and control). This case study FLD conducted in national sorting hub, Mangalore, and Karnataka State in the southern part of India. Empirical results show that the AHP method is one of the promising ways to solve the FLD problem. © 2019, The Society for Reliability Engineering, Quality and Operations Management (SREQOM), India and The Division of Operation and Maintenance, Lulea University of Technology, Sweden.
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    Enhancing the operational performance of mail processing facility layout selection using multi-criteria decision making methods
    (Inderscience Enterprises Ltd. editor@inderscience.com 29, route de Pre-Bois Case Postale 856, CH-1215 Geneva 15 CH-1215, 2020) Vadivel, V.; Sequeira, A.H.
    Generally, facility layout design (FLD) has a significant impact on the performance of a manufacturing or service industry which comes under multi-objective problem. Facility layout design is aimed to streamline the work flow and increasing the productivity. This paper attempts to incorporate multi-criteria decision making process (MCDM) methods to find the optimum layout to improve the operational performance through lean service, workplace environment and ergonomics approach. Layout design focuses on identification and elimination of waste (non-value added activities) and comfortable workplace environment with suitable ergonomics conditions in order to achieve the target production. The proposed methods are exemplified through practical applications in Indian postal manual speed post sorting facility layouts. In this case study, we have proposed three methods: analytical hierarchy process (AHP), technique for order preference by similarity to ideal solution (TOPSIS) and fuzzy TOPSIS. Empirical results are encouraging for implementing feasible methods in solving a layout design problem. © © 2020 Inderscience Enterprises Ltd.
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    Growth of octahedral structured AgBiS2 single crystals and its insights on the high performance electrocatalytic hydrogen generation
    (Elsevier Ltd, 2024) Jauhar, R.O.M.; Ramachandran, K.; Deepapriya, S.; Joshi, S.; Ghfar, A.A.; Rao, L.; Badekai Ramachandra, B.R.; Udayashankar, N.K.; Vadivel, V.; Raji, R.; Kim, B.C.; Rodney, J.D.
    Given the enormous depletion of fossil fuels and growing environmental concerns, there is an immediate need to develop alternative and clean energy sources. Hydrogen (H2), recognized for its cleanliness and renewability, is poised to meet future energy requirements. Consequently, ongoing research is focused on the development of electro-active, durable, and cost-effective catalysts to replace expensive noble metal-based electrocatalysts. In this study, microscale AgBiS2 chalcogenide derived from a single crystal is reported as promising electrocatalysts for the Hydrogen Evolution Reaction (HER) with a remarkably low overpotential. The physico-chemical characterization of the AgBiS2 catalyst has been investigated using various analytical techniques. The synthesized AgBiS2 catalyst exhibits excellent HER activity, manifesting a low overpotential of 86 mV at a current density of 10 mA cm−2 and a Tafel slope of 44 mV dec−1, along with superior stability even after 24 h in HER at a very high current density. The developed AgBiS2 also showcased stable production when subjected to a two-electrode system. The enhanced alkaline HER activity of AgBiS2 can be attributed to its phase purity, high crystallinity, and the presence of high active sites. The observed high electrochemical performance and stability position AgBiS2 as a potential electrocatalyst for the hydrogen evolution reaction. This finding holds significant promise in the quest for efficient, durable, and economically viable catalysts to drive the shift towards clean and renewable energy sources. © 2024 Hydrogen Energy Publications LLC
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    Sustainable postal service design: integrating quality function deployment from the customers perspective
    (Springer, 2020) Vadivel, V.; Sequeira, A.H.; Jauhar, S.K.; Kumar, V.
    The need of the hour today is to incorporate sustainable principles to the public postal service facilities to withstand in the market. This paper objective is to develop a model to explore the quality function deployment (QFD) concept and technique to be incorporated in India post service operations. It aims to support sustainability by finding customer factors (queries) that affect service quality design/dimensions. This survey will be helpful, to understand how India post can remain strategically sustainable for the next few decades. It has an extensive network of logistics to serve customers throughout the country. This study improves QFD tools for the postal service quality design known as House of Quality Sustainable Design. © 2020, The Society for Reliability Engineering, Quality and Operations Management (SREQOM), India and The Division of Operation and Maintenance, Lulea University of Technology, Sweden.
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    Sustained hydrogen production through alkaline water electrolysis using Bridgman–Stockbarger derived indium-impregnated copper chromium selenospinel
    (Elsevier Ltd, 2024) Jauhar, R.M.; Raji, R.; Deepapriya, S.; Raja, A.; Rao, L.; Joshi, S.; Era, P.; Badekai Ramachandra, B.R.; Udayashankar, N.K.; Vadivel, V.; Mangalaraja, R.V.; J, J.; Ghfar, A.A.; Senthilpandian, M.; Kim, B.C.; Rodney, J.D.
    The depletion of conventional fossil fuels necessitates the development of sustainable energy alternatives, with electrochemical water splitting for hydrogen (H2) production being a promising solution. However, large-scale hydrogen generation is hindered by the scarcity of cost-effective electrocatalysts to replace noble metals such as Pt and RuO2 in the Oxygen Evolution Reaction (OER) and Hydrogen Evolution Reaction (HER). In this study, we report the synthesis of CuCr2-xInxSe4 (x = 0, 0.2, 0.4) using a dual approach combining the Bridgman-Stockbarger method and ball milling. Among the synthesized materials, CuCr1.8In0.2Se4 demonstrates outstanding HER activity in 1.0 M KOH, achieving a potential of ?0.16 V vs. RHE at a current density of 10 mA cm?2. Moreover, the material shows remarkable durability during a three-electrode accelerated degradation test in an alkaline medium, maintaining its performance over 24 h at a constant current density of ?200 mA cm?2, with a stable potential of ?0.57 V vs. RHE. Additionally, CuCr1.8In0.2Se4 was tested in a two-electrode configuration alongside CoFe LDH, achieving a benchmark of 1.7 V for overall water splitting. It sustained a current density of 400 mA cm?2 for 24 h in an accelerated degradation test, exhibiting a minimal loss of 0.1 V after the testing period. These results highlight CuCr1.8In0.2Se4 as a promising non-noble metal catalyst for HER, demonstrating its potential to reduce reliance on noble materials for large-scale hydrogen production. © 2024 Hydrogen Energy Publications LLC