V. V. Singh, Abubakkar Idris Mohhammad, Kabiru Hamisu Ibrahim and Ibrahim Yusuf
This paper analyzed a complex system consisting n-identical units under a k-out-of-n: G; configuration via a new method which has not been studied by previous researchers. The…
Abstract
Purpose
This paper analyzed a complex system consisting n-identical units under a k-out-of-n: G; configuration via a new method which has not been studied by previous researchers. The computed results are more supportable for repairable system performability analysis.
Design/methodology/approach
In this paper, the authors have analyzed a complex system consisting n-identical units under a k-out-of-n: G; configuration via a new method which has not been studied by previous researchers. The supplementary variable technique has employed for analyzing the performance of the system.
Findings
Reliability measures have been computed for different types of configuration. It generalized the results for purely series and purely parallel configurations.
Research limitations/implications
This research may be beneficial for industrial system performances whereas a k-out-of-n-type configuration exists.
Practical implications
Not sure as it is a theoretical assessment.
Social implications
This research may not have social implications.
Originality/value
This work is the sole work of authors that have not been communicated to any other journal before.
Details
Keywords
Ismail Muhammad Musa and Ibrahim Yusuf
The purpose of this paper is to model and to improve the stability and long-lasting operation of the small home solar system configuration regarding the reliability, availability…
Abstract
Purpose
The purpose of this paper is to model and to improve the stability and long-lasting operation of the small home solar system configuration regarding the reliability, availability, sensitivity, cost analysis and mean time to failure (MTTF).
Design/methodology/approach
A model of a small home solar system is designed in this write up. It is designed in a series–parallel configuration, such that four panels are arranged in parallel, working under 1-out-of-4: G; policy and two batteries configured in parallel also, working under 1-out-of-2: G; policy. The panels are connected to a charge controller, then to the batteries and lastly to an inverter, all connected together in series configuration. Different types of system reliability such as reliability, sensitivity, availability, MTTF and cost analysis for particular values of the failure and repair rates have been evaluated by using a supplementary variable and Laplace transforms and demonstrated the computed results on tables and graphs. The main objective here is to improve the stability and long-lasting operation of the small solar system configuration regarding the reliability, availability, sensitivity, cost analysis and MTTF.
Findings
The future behavior of the small solar system and similar systems can be easily predicted at any given time for any parametric values, it is also better to provide repair than replacements in the system for better availability and reliability, it signifies that
Originality/value
This paper provides a model of small home solar system and its reliability analysis.
Details
Keywords
Abdulkareem Lado Ismail, Sanusi Abdullahi and Ibrahim Yusuf
This study deals with the reliability analysis of a hybrid series–parallel system consisting of two subsystems A and B with two human operators. Subsystem A has two units in…
Abstract
Purpose
This study deals with the reliability analysis of a hybrid series–parallel system consisting of two subsystems A and B with two human operators. Subsystem A has two units in active parallel while subsystem B consists of two-out-of-four units. Both units have exponential failure and repair time. The system under consideration has two states: partial failure state and complete failure state. The mathematical equations associated with the transition diagram have been formulated using regenerative point techniques. The system is analysed using Laplace transforms to solve the mathematical equations. Some important measures of reliability such as availability of system, reliability of the system, mean time to failure (MTTF), sensitivity for MTTF and cost analysis have been discussed. Some particular cases have also been derived and examined to see the practical effect of the model. The computed results are demonstrated by tables and graphs. Furthermore, the results of the designed model are beneficial for system engineers and designers, reliability and maintenance managers.
Design/methodology/approach
This paper considered a hybrid series–parallel system consisting of two subsystems A and B with two human operators. The performance of the system is studied using the supplementary variable technique and Laplace transforms. The various measures of reliability such as availability, reliability, mean time to system failure (MTSF), sensitivity for MTTF and cost analysis have been computed for various values of failure and repair rates. Maple 13 software has been used for computations.
Findings
In this research paper, the authors have computed various measures of reliability such as availability, reliability, MTSF, sensitivity for MTTF and cost analysis for various values of failure and repair rates and find that failure due to human operators are more responsible for successful operation of the system and also regular repair should be invoked to improve system performance.
Originality/value
This research paper is the original work of authors. The references are well cited based on the importance of study. Nothing has been detached from any research paper or books.
Details
Keywords
Yusuf Ibrahim Kofarmata and Abubakar Hamid Danlami
The purpose of this paper is to model credit rationing among farmers in rural developing areas, based on micro level data of Kano State, Nigeria.
Abstract
Purpose
The purpose of this paper is to model credit rationing among farmers in rural developing areas, based on micro level data of Kano State, Nigeria.
Design/methodology/approach
A total of 835 households and 45 microfinance banks were utilized as the samples of the study which were selected using multi-stage stratified sampling technique. Multinomial logit model was used to estimate the factors that determine credit rationing among the rural farmers in Nigeria.
Findings
The result of the discrete choice model shows that farmers who are either being engaged in subsistence farming or trading have a significant effect on credit rationing with the greatest impacts found on the farm profit and farmers’ location.
Research limitations/implications
This study failed to carry out a dynamic analysis regarding agricultural credit rationing. Also, it is well known that formal credit interacts with informal credit sector; nevertheless, this interaction was unaccounted for in this study. Therefore, future studies can expand the scope of this research to account for this interaction. In fact, investigating heterogeneity among credit providers will be an important topic in the future.
Practical implications
Clear and sound policies are required for the establishment of new agencies and financial institutions devoted to agricultural sector. Similarly, an integrated system of forward-looking policies based on tax and subsidy-regimes to augment desired incentives for private financial sector and NGOs to lend money to the farmers are needed.
Originality/value
Consistent with risk-balancing theory, the good story for farmers is that profit making farmers are less likely to be among the constrained borrowers. It turned out from the credit rationing model that urban farmers had a greater chance of being successful applicants in the Nigerian agricultural credit market. In comparison to farmers at periphery, urban residents are less likely to be associated with being constrained borrowers.
Details
Keywords
Anas Sani Maihulla, Ibrahim Yusuf and Muhammad Salihu Isa
Solar photovoltaic (PV) is commonly used as a renewable energy source to provide electrical power to customers. This research establishes a method for testing the performance…
Abstract
Purpose
Solar photovoltaic (PV) is commonly used as a renewable energy source to provide electrical power to customers. This research establishes a method for testing the performance reliability of large grid-connected PV power systems. Solar PV can turn unrestricted amounts of sunlight into energy without releasing carbon dioxide or other contaminants into the atmosphere. Because of these advantages, large-scale solar PV generation has been increasingly incorporated into power grids to meet energy demand. The capability of the installation and the position of the PV are the most important considerations for a utility company when installing solar PV generation in their system. Because of the unpredictability of sunlight, the amount of solar penetration in a device is generally restricted by reliability constraints. PV power systems are made up of five PV modules, with three of them needing to be operational at the same time. In other words, three out of five. Then there is a charge controller and a battery bank with three batteries, two of which must be consecutively be in operation. i.e. two out of three. Inverter and two distributors, all of which were involved at the same time. i.e. two out of two. In order to evaluate real-world grid-connected PV networks, state enumeration is used. To measure the reliability of PV systems, a collection of reliability indices has been created. Furthermore, detailed sensitivity tests are carried out to examine the effect of various factors on the efficiency of PV power systems. Every module's test results on a realistic 10-kW PV system. To see how the model works in practice, many scenarios are considered. Tables and graphs are used to show the findings.
Design/methodology/approach
The system of first-order differential equations is formulated and solved using Laplace transforms using regenerative point techniques. Several scenarios were examined to determine the impact of the model under consideration. The calculations were done with Maple 13 software.
Findings
The authors get availability, reliability, mean time to failure (MTTF), MTTF sensitivity and gain feature in this research. To measure the reliability of PV systems, a collection of reliability indices has been created. Furthermore, detailed sensitivity tests are carried out to examine the effect of various factors on the efficiency of PV power systems.
Originality/value
This is the authors' original copy of the paper. Because of the importance of the study, the references are well-cited. Nothing from any previously published articles or textbooks has been withdrawn.
Details
Keywords
Camillus Abawiera Wongnaa, Peter Addai, Prince Quainoo, Kwasi Ohene-Yankyera, Kwame Enoch Tham-Agyekum and Dadson Awunyo-Vitor
This study examined the factors influencing oil palm farmers’ decisions to engage in contract farming as well as their extent of participation.
Abstract
Purpose
This study examined the factors influencing oil palm farmers’ decisions to engage in contract farming as well as their extent of participation.
Design/methodology/approach
The study used cross-sectional data collected from 210 oil palm producers in the western region of Ghana. Descriptive statistics and Cragg’s double hurdle model were the methods of analysis.
Findings
The results showed that household size, membership of farmer association, farm size, market knowledge and loan availability significantly positively influence farmers’ decisions to engage in contract farming. Also, while membership in farmer associations and market knowledge exerted significant positive influences on the extent to which farmers participated in contract farming, extension contacts and distance to the farm exerted significant negative influences on the extent of farmers’ participation.
Practical implications
The government, in collaboration with other interested parties, should educate and encourage farmers on the benefits of participating in contract farming arrangements with reputable and well-known institutions that have taken steps to make their services available to farmers.
Social implications
The study recommends that the government and other contracting firms, like the Golden Star Oil Palm Plantation, should make farm credit a key aspect of their packages, as this will be more attractive to the smallholders.
Originality/value
The study adds to existing literature by providing contracting companies with helpful information on factors influencing oil palm farmers’ decisions to engage in contract farming.
Peer review
The peer review history for this article is available at: https://publons.com/publon/10.1108/IJSE-03-2024-0284
Details
Keywords
Arianne Maraj, Domenique Sherab, Milagros Calderon-Moya and Ratna Ghosh
Transnational shifts experienced by Syrian refugee young adults disrupt their lives. Many start their journey as children, transition into adolescents often in countries of…
Abstract
Transnational shifts experienced by Syrian refugee young adults disrupt their lives. Many start their journey as children, transition into adolescents often in countries of asylum, and resettle as young adults in countries such as Canada with the dream to rebuild their lives. Too old (+16) for the traditional school cycle, they are encouraged into adult education (AE) as their only choice to complete their high school diplomas to obtain minimum wage jobs or continue to higher education. Their progress through AE continues their destabilization, particularly in terms of their aspirations, hopes and dreams. The authors focus on the educational journeys of this population who have largely been forgotten by policies and programs for refugee integration. Drawing upon 29 interviews with Syrian refugee young adults in Quebec, using a theoretical framework of migration/aspirations and critical race theory, the authors highlight how disruption is perpetuated in their education after their arrival rather than stability.
Details
Keywords
The purpose of this qualitative study is to identify and highlight the challenges faced by the dual-career couples with one or multiple child/children in maintaining their…
Abstract
Purpose
The purpose of this qualitative study is to identify and highlight the challenges faced by the dual-career couples with one or multiple child/children in maintaining their work–family balance based on family systems theory.
Design/methodology/approach
The author purposely selected 26 families (52 participants) in Bangladesh where both husbands and wives work on a full-time basis having one or multiple child/children. The author used focus group discussion (FGD) technique to identify the challenges encountered by them.
Findings
After summarising the FGD results, the study identified several challenges faced by those dual-career couples, such as inability to differentiate between professional and family lives, lack of quality time for partners/children, challenges to raise children, lack of childcare centres and lack of professionalism of care workers; and tension and anxiety for their child/children while at offices.
Originality/value
The author expects the results of this qualitative study to be conductive as groundwork for upcoming research studies concerning dual-career couples with child/children. The author also hopes that such results will assist the human resource managers in efficiently crafting and executing some policies regarding dual-career couples with one or multiple child/children.
Details
Keywords
Abbas Bin Jibril, V.V. Singh and Dilip Kumar Rawal
The purpose of this paper is to deliberate the system reliability of a system in combination of three subsystems in a series configuration in which all three subsystems function…
Abstract
Purpose
The purpose of this paper is to deliberate the system reliability of a system in combination of three subsystems in a series configuration in which all three subsystems function under a k-out-of-n: G operational scheme. Based on computed results, it has been demonstrated that copula repair is better than general repair for system better performance. The supplementary variable approach with implications of copula distribution has been employed for assessing the system performance.
Design/methodology/approach
Probabilistic assessment of complex system consisting three subsystems, multi-failure threats and copula repair approach is used in this study. Abbas Jubrin Bin, V.V. Singh, D.K. Rawal, in this research paper, have analyzed a system consisting of three subsystems in a series configuration in which all three subsystems function under a k-out-of-n: G operational scheme. The supplementary variable approach with implications of copula distribution has been employed for assessing the system performance. Based on computed results, it has been demonstrated that copula repair is better than general repair for system better performance.
Findings
In this analysis, four different cases of availability are analysed for Gumbel–Hougaard family copula and also four cases for general repair with similar failure rates are studied. The authors found that when failure rates increase, the system availability decreases, and when the system follows copula repair distribution, the system availability is better than general repair.
Research limitations/implications
This research may be implemented in various industrial systems where the subsystems are configured under k-out-of-n: G working policy. It is also advisable that copula repair is highly recommended for best performances from the system. On the basis of mean time to system failure (MTSF) computations, the failure rate which affects system failure more needs to be controlled by monitoring, servicing and replacing stratagem.
Practical implications
This research work has great implications in various industrial systems like power plant systems, nuclear power plant, electricity distributions system, etc. where the k-out-of-n-type of system operation scheme is validated for system operations with the multi-repair.
Originality/value
This work is a new work by authors. In the previously available technical analysis of the system, the researchers have analyzed the repairable system either supplementary variable approach, supplementary variable and system which have two subsystems in a series configuration. This research work analyzed a system with three subsystems with a multi-repair approach and supplementary variables.