Oladipupo A. Olaitan and John Geraghty
The aims of this paper is to investigate simulation‐based optimisation and stochastic dominance testing while employing kanban‐like production control strategies (PCS) operating…
Abstract
Purpose
The aims of this paper is to investigate simulation‐based optimisation and stochastic dominance testing while employing kanban‐like production control strategies (PCS) operating dedicated and, where applicable, shared kanban card allocation policies in a multi‐product system with negligible set‐up times and with consideration for robustness to uncertainty.
Design/methodology/approach
Discrete event simulation and a genetic algorithm were utilised to optimise the control parameters for dedicated kanban control strategy (KCS), CONWIP and base stock control strategy (BSCS), extended kanban control strategy (EKCS) and generalised kanban control strategy (GKCS) as well as the shared versions of EKCS and GKCS. All‐pairwise comparisons and a ranking and selection technique were employed to compare the performances of the strategies and select the best strategy without consideration of robustness to uncertainty. A latin hypercube sampling experimental design and stochastic dominance testing were utilised to determine the preferred strategy when robustness to uncertainty is considered.
Findings
The findings of this work show that shared GKCS outperforms other strategies when robustness is not considered. However, when robustness of the strategies to uncertainty in the production environment is considered, the results of our research show that the dedicated EKCS is preferred. The effect of system bottleneck location on the inventory accumulation behaviour of different strategies is reported and this was also observed to have a relationship to the nature of a PCS's kanban information transmission.
Practical implications
The findings of this study are directly relevant to industry where increasing market pressures for product diversity require operating multi‐product production lines with negligible set‐up times. The optimization and robustness test approaches employed in this work can be extended to the analysis of more complicated system configurations and higher number of product types.
Originality/value
This work involves further investigation into the performance of multi‐product kanban‐like PCS by examining their robustness to common sources of uncertainties after they have been initially optimized for base scenarios. The results of the robustness tests also provide new insights into how dedicated kanban card allocation policies might offer higher flexibility and robustness over shared policies under conditions of uncertainty.
Details
Keywords
Family planning is one of the services that has positive influence on the social welfare and health of the mothers and directly contributes to reduction of maternal morbidity and…
Abstract
Family planning is one of the services that has positive influence on the social welfare and health of the mothers and directly contributes to reduction of maternal morbidity and mortality. Family planning is a major health issue in Africa and it has degenerated more into socioeconomic problems like poverty, overpopulation, delinquent children, and so on. Studies have shown that family planning is safe to use but this has remains obscure to most women in developing countries such as Nigeria. Fewer numbers of women have knowledge and access to family planning but majority of Nigerians failed to adopt the habit as a result of many factors such as education, age, culture, religion, income, and health status which influence their attitude toward family planning among others. Social Action Theory was used as the theoretical guide in examining the behavior, attitude, and perception of women toward family planning as well as to give a clear knowledge about the importance of family planning on individual, family, and society at large. This chapter reveals that population explosion, malnutrition, and diseases such as HIV (and other diseases) are trending in Nigeria. Hence, it was recommended that every health worker should engage more in community-based awareness and enlightenment on the utilization of family planning; also, there is a need to intensify information dissemination and educational campaigns through the media. Furthermore, importance should be placed on modern contraceptives.