Faculty Publications

Permanent URI for this communityhttps://idr.nitk.ac.in/handle/123456789/18736

Publications by NITK Faculty

Browse

Author: search.filters.author.Saha, S.

Search Results

Now showing 1 - 10 of 25
  • No Thumbnail Available
    Item
    Use of concrete wastes as the partial replacement of natural fine aggregates in the production of concrete
    (Springer, 2019) Saha, S.; C, C.; Vinay, K.
    Due to rapid development of construction industries in various dimensions, demand for construction materials is also gaining high momentum. Therefore, availability of natural sources of construction materials is going to be in decreasing trend to cope up with the high demand. Again currently, quantity of construction and demolition waste is also going too high day by day. Reuse of these construction and demolition waste is one of the promising solutions to protect natural fine aggregates. This study aims at investigations the possibility of the usage of these construction and demolition wastes to produce the fresh concrete with desirable properties. Natural fine aggregates (river sand) are replaced by the recycled fine aggregates by the different percentage levels for the production of fresh concrete. A comparative interpretation on the strength characteristics of the concrete produced with Ordinary Portland Cement and Portland Pozzolana Cement is also presented and discussed in this paper. © Springer Nature Singapore Pte Ltd. 2019.
  • No Thumbnail Available
    Item
    Use of foundry sand as partial replacement of natural fine aggregate for the production of concrete
    (Springer, 2019) Saha, S.; C, C.; More, A.P.
    The scarcity of natural fine aggregate becomes prominent in the present scenario due to high consumption of natural fine aggregate as the demand for concrete is increasing day by day. As a result, environmental degradation also becomes very significant. In this experimental study, an effort has been made to study the feasibility of using foundry sand as partial replacement for natural fine aggregate to produce concrete with desired properties. Physical and mechanical properties of the produced concrete were studied by incorporating foundry sand, 10, 20, 30, and 40% of the mass of total fine aggregate in the mixes. For achieving the desired strength of concrete mixes, 30% replacement of natural fine aggregates by foundry sand was observed in this work to be considered for the production of fresh concrete. Use of certain percentage of foundry sand as alternative for natural fine aggregate to produce concrete will lead to protect the natural resources, save the environmental system, and promote sustainability in concrete industries. © Springer Nature Singapore Pte Ltd. 2019.
  • No Thumbnail Available
    Item
    An experimental investigation to determine the properties of fly ash based geopolymers as per indian standards
    (Springer, 2019) Saha, S.; C, C.
    Production of ordinary Portland cement requires huge quantity of natural resources and also releases huge quantity of carbon dioxide into the atmosphere. Research efforts have been continuing to establish geopolymer as an alternative cementitious material for the replacement of ordinary Portland cement. This paper presents the study to find out the properties of fly ash based geopolymer paste and 28 days compressive strength of geopolymer mortar. Standard consistency, setting time of geopolymer paste has been determined using vicat’s apparatus (according to Indian Standards), which is followed for cement paste, varying the concentration of sodium hydroxide solution from 6 to 16 M. Results indicate higher standard consistency, more time required for setting for fly ash based geopolymer than that of cement paste. Compressive strength of the geopolymer paste and mortar 17 specimens increases with the increase of the concentration of sodium hydroxide solution and decrease beyond 14 M. © 2019, Springer Nature Singapore Pte Ltd.
  • No Thumbnail Available
    Item
    A hybrid model of convo-GAN to detect fake images
    (Grenze Scientific Society, 2021) Saha, S.; Rudra, B.
    With advancements in the field of Deep Learning, it has become easy to generate face swaps, thereby creating fake images which look extremely realistic, leaving few traces which cannot be detected by bare human eyes. Such images are known as ‘DeepFakes’ that can be used to create a ruckus and affect the quality of public discourse on sensitive issues, defame an individual’s profile, create political distress, blackmail a person or envision fake cyber terrorists. This paper proposes methods to detect fake images with the help of hybrid models having Convolutional Neural Network with Error Level Analysis, Gated Recurrent Unit neural network, Long Short Term Memory recurrent neural network and Generative Adversarial Network respectively. The 2019 ‘Real and Fake Face Detection’ dataset from Kaggle [7] is used to train the models and by experimentation we are able to prove that the combined model of Convolutional Neural Network and Generative Adversarial Network outperforms other models. © Grenze Scientific Society, 2021.
  • No Thumbnail Available
    Item
    Function Scheduling with Data Security in Serverless Computing Systems
    (Institute of Electrical and Electronics Engineers Inc., 2025) Saha, S.; Pandey, A.; Addya, S.K.; Brata Nath, S.
    In serverless computing, the service provider takes full responsibility for function management. However, serverless computing has many challenges regarding data security and function scheduling. To address these challenges, we have proposed a system to secure the data of an end-user. We also aim to meet the quality of service (QoS) for the end-user requests. This work presents a Simulated Annealing-based optimization algorithm for function placement. Also, we have Hyperledger Fabric, a blockchain framework in the system architecture for securing the data of an end-user. We have conducted experiments in Amazon Elastic Compute Cloud (EC2) taking virtual machine instances. The experiments in Amazon EC2 indicate that the proposed system secures the data and enhances the end-user's QoS. © 2025 IEEE.
  • No Thumbnail Available
    Item
    Empirical validation of dimensionality of quality of work life in India
    (Serials Publications scienti@sancharnet.in, 2016) Saha, S.; Kumar, S.P.
    Purpose - Quality of work life is a unique and distinctive construct that is highly valued in organizations. The purpose of this paper is to identify the dimensions of quality of work life from Indian perspective. Design/methodology/approach - Exploratory factor analysis was employed to identify the constituent dimensions suitable to measure quality of work life. Confirmatory factor analysis was then performed on these identified dimensions and their items to check validity, reliability and dimensionality and determine a factor structure. Findings - Results obtained suggested a three-dimensional conceptualization of quality of work life with twelve items. The dimensions identified are entitled as quality of work life with health and safety (QWLHS), family and pay (QWLFP) and knowledge (QWLK). Research limitations/implications - The findings can benefit managers at an operational level. They can make their employees work effectively with focus to improve every smallest aspect of work life. Originality/value - This paper is the first of its kind to conduct exploratory factor analysis followed by confirmatory factor analysis to identify a three-factor quality of work life conceptualization in Indian context.
  • No Thumbnail Available
    Item
    Mechanical properties of recycled aggregate concrete produced with Portland Pozzolana Cement
    (Techno Press technop2@chollian.net, 2016) Saha, S.; C, C.
    The quantity of construction and demolition waste has been greatly increasing recently. It causes many problems to the environment. For this reason, demolition waste management becomes inevitable in order to overcome the environmental issues. The present study aims to evaluate the effects of using recycled coarse aggregate, which is generated from construction and demolition waste, on the properties of recycled aggregate concrete. An experimental investigation on the strength characteristics of concrete made with recycled coarse aggregate is presented and discussed in this paper. In this study, Portland Pozzolana Cement (fly ash based) is used instead of ordinary Portland cement. The results of this investigation show the possibility of the use of recycled coarse aggregates in the production of fresh concrete. Use of demolition waste as coarse aggregate will lead to a cleaner environment with a significant reduction of the consumption of natural resources. A comparative study on the strength characteristics of recycled aggregate concrete made with Ordinary Portland Cement and Portland Pozzolana Cement is presented and discussed in this paper. © 2016 Techno-Press, Ltd.
  • No Thumbnail Available
    Item
    Impact of demographics on multiple commitments: Empirical evidence from Indian public sector undertakings
    (Associated Management Consultants Pvt. Ltd. editor@indianjournalofmarketing.com, 2016) Saha, S.; Kumar, S.
    Purpose: The purpose of this study was to determine the demographics that impact multiple commitments in Indian businesses. Design/Methodology/Approach: This research was conducted with the responses of 712 managerial employees working in Indian public sector undertakings. Findings: The results indicated that affective commitment is positively impacted by education. Continuance commitment is positively impacted by age, education, and tenure. Normative commitment is positively impacted by education and tenure. Group commitment is positively related to tenure. Job involvement is positively impacted by age and tenure. Implications: These findings are important for managers so that they can help build and improve different types of commitment of employees in organizations. Originality: This study is unique because it is the first of its kind in India to have investigated demographics for multiple commitments.
  • No Thumbnail Available
    Item
    Influence of participation in decision making on job satisfaction, group learning, and group commitment: Empirical study of public sector undertakings in India
    (Penerbit Universiti Sains Malaysia aamj@usm.my, 2017) Saha, S.; Kumar, S.
    This study assesses the impact of participation in decision making on job satisfaction, group commitment, and group learning. Data were collected from 397 managerial employees working in public sector undertakings across India. Structural equation modeling as a statistical technique and WarpPLS as a statistical tool was used to verify the proposed relationships. The findings of the study suggest that participation in decision making had a positive and significant relationship with job satisfaction. Further, participation in decision making had significant impact on group learning, but had no impact on group commitment. Job satisfaction had a positive and significant impact on group commitment. Group learning was positively and significantly related to job satisfaction and group commitment. The results suggest that employee participation in decision making process is highly desirable as it elevates employee identification with their respective organisation. The findings of the study are relevant to the people holding key managerial positions in public sector undertakings and they are discussed in detail. © Asian Academy of Management and Penerbit Universiti Sains Malaysia, 2017.
  • No Thumbnail Available
    Item
    Enhancement of the properties of fly ash based geopolymer paste by incorporating ground granulated blast furnace slag
    (Elsevier Ltd, 2017) Saha, S.; C, C.
    Research efforts have been made continuously to establish fly ash based geopolymer as an alternative binder material for the production of fresh concrete because production of Ordinary Portland Cement degrades the environment by huge emissions of carbon-di-oxide and also by consuming lot of natural resources. But most of the study reveals, fly ash based geopolymer paste needs more time to get set when it is cured at ambient temperature. As a result, it is quite impractical to use fly ash based geopolymer paste as an alternative to Ordinary Portland Cement in faster construction. In this study, an effort has been made to enhance the properties of fly ash based geopolymer paste by incorporating ground granulated blast furnace slag at various percentage levels. Microstructure of the geopolymer paste is studied using Scanning Electron Microscopy. Result of this investigation shows that significant improvement on setting time and compressive strength can be obtained by adding ground granulated blast furnace slag in the mixes. © 2017 Elsevier Ltd