Search results

1 – 10 of 310
Per page
102050
Citations:
Loading...
Access Restricted. View access options
Article
Publication date: 1 June 1997

K.A.H. Kobbacy, D.F. Percy and B.B. Fawzi

Preventive maintenance (PM) is an effective maintenance policy which is widely applied in industry. Reviews the main approaches of modelling PM and discusses the characteristics…

1015

Abstract

Preventive maintenance (PM) is an effective maintenance policy which is widely applied in industry. Reviews the main approaches of modelling PM and discusses the characteristics of real life PM data which influence the methods for modelling PM. The most salient features of these data are the limited size and intensive censoring effect. Then introduces a parametric bootstrap method for fitting PM data to distributions. A simulation study to compare this method with the established Akaike and Schwarz criteria shows that while the bootstrap method is marginally better in identifying the true distribution, this is counterbalanced by the intensive computational effort needed.

Details

Journal of Quality in Maintenance Engineering, vol. 3 no. 2
Type: Research Article
ISSN: 1355-2511

Keywords

Access Restricted. View access options
Book part
Publication date: 10 February 2025

Loukia G. Tsaprouni

Air pollution poses a significant global threat to both human health and environmental stability, acknowledged by the World Health Organization as a leading cause of…

Abstract

Air pollution poses a significant global threat to both human health and environmental stability, acknowledged by the World Health Organization as a leading cause of non-communicable diseases (NCDs) and a notable contributor to climate change. This chapter offers a comprehensive review of the impacts of air pollution on health, highlighting the complex interactions with genetic predispositions and epigenetic mechanisms. The consequences of air pollution to health are extensive, spanning respiratory diseases, cardiovascular disorders, adverse pregnancy outcomes, neurodevelopmental disorders, and heightened mortality rates. Genetic factors play a pivotal role in shaping individual responses to air pollution, influencing susceptibility to respiratory illnesses and the severity of symptoms. Additionally, epigenetic changes triggered by exposure to pollutants have been linked to respiratory health issues, cancer development and progression, and even transgenerational effects spanning multiple generations. As countries, including the UK, pursue ambitious targets for reducing emissions, ongoing research into the complex interplay of air pollution, genetics, and epigenetics is essential. By unravelling the underlying mechanisms and advancing preventive and therapeutic strategies, we can protect public health and promote sustainable environmental practices in the face of this pervasive global challenge.

Details

Examining Net Zero: Creating Solutions for a Greener Society and Sustainable Economic Growth
Type: Book
ISBN: 978-1-83608-574-4

Keywords

Access Restricted. View access options
Article
Publication date: 10 July 2017

Lauren Grace Moulds and Andrew Day

Adolescent violence towards parents (AVTP) has damaging impacts on family relationships, however, little is known about the characteristics of the families in which it occurs. The…

439

Abstract

Purpose

Adolescent violence towards parents (AVTP) has damaging impacts on family relationships, however, little is known about the characteristics of the families in which it occurs. The purpose of this paper is to synthesize current knowledge of the AVTP characteristics to help to inform the development of more effective community responses.

Design/methodology/approach

The paper opted for a Rapid Evidence Assessment taking an ecological approach to organize current knowledge about the characteristics of both victims and perpetrators of AVTP. It synthesized 20 empirical studies identified from a systemic review of published literature.

Findings

The assessment concludes that adolescents who perpetrate AVTP typically experience high levels of comorbid mental health concerns, drug and alcohol use, anger difficulties and trauma. The victims (parents) are characterized as having strained relationships with other family members and trauma profiles.

Practical implications

Policy and practice responses should be tailored to systemically address needs in the identified areas. This review further illustrates the limitations of current knowledge, highlighting inconsistencies in both definitions and findings, particularly related to key characteristics.

Originality/value

This paper is the first of its kind to systemically search this literature and only include the most rigorously designed studies. It adds value to the developing field of AVTP by providing the scaffolding of the characteristics of families who have been impacted.

Details

Journal of Aggression, Conflict and Peace Research, vol. 9 no. 3
Type: Research Article
ISSN: 1759-6599

Keywords

Access Restricted. View access options
Article
Publication date: 20 June 2019

Fernanda Leite-Pereira, Filipa Brandao and Rui Costa

Diverse factors may influence travelers when choosing a hotel. Even though breakfast is often commented on in hotel and booking sites, its relative role in hotel selection is…

903

Abstract

Purpose

Diverse factors may influence travelers when choosing a hotel. Even though breakfast is often commented on in hotel and booking sites, its relative role in hotel selection is rarely studied. This paper aims to determine which attributes clients consider essential regarding the option towards a hotel and their hierarchy namely of breakfast.

Design/methodology/approach

A systematic review was performed in Scopus, ISI-Web of Science and Google Scholar, including relevant original manuscripts published in all languages between 1998 and 2018.

Findings

Out of 337 initial references, 25 manuscripts were included. Features related to facilities and services were considered in most manuscripts with 21 and 20 citations, respectively, as being the more relevant factors in hotel selection. Room and accommodation were ranked first as the most important characteristic regarding the option for a hotel, whereas breakfast was only referred to in two articles, published in 2015 and 2017, rated in the tenth and fourth positions, respectively.

Research limitations/implications

Breakfast seems to be addressed in recent published manuscripts, what may reflect a trend toward its evaluation in travelling experiences. More studies should address the relevance of breakfast and food to (diverse type of) costumers, and managers should also consider these factors when advertising their hotels.

Originality/value

To the best of the authors’ knowledge, this is the first systematic approach to this question, emphasizing the apparent contradiction of breakfast being often cited in booking sites and not adequately studied in tourism research.

Details

International Journal of Culture, Tourism and Hospitality Research, vol. 13 no. 2
Type: Research Article
ISSN: 1750-6182

Keywords

Access Restricted. View access options
Article
Publication date: 8 May 2017

Ernnie Illyani Basri, Izatul Hamimi Abdul Razak, Hasnida Ab-Samat and Shahrul Kamaruddin

The purpose of this paper is to provide comprehensive information on preventive maintenance (PM) planning and methods used in the industry in order to achieve an effective…

5231

Abstract

Purpose

The purpose of this paper is to provide comprehensive information on preventive maintenance (PM) planning and methods used in the industry in order to achieve an effective maintenance system.

Design/methodology/approach

The literature review is organized in a way that provides the general overview of the researches done in the PM. This paper discusses the literatures that had been reviewed on four main topics, which are the holistic view of maintenance policies, PM planning, PM planning concept and PM planning-based in developing optimal planning in executing PM actions.

Findings

PM policy is one of the original proactive techniques that has been used since the start of researches on maintenance system. Review of the methods presented in this paper shows that most researches analyse effectiveness using artificial intelligence, simulation, mathematical formulation, matrix formation, critical analysis and multi-criteria method. While in practice, PM activities were either planned based on cost, time or failure. Research trends on planning and methods for PM show that the variation of approaches used over the year from early 1990s until today.

Practical implications

Research about PM is known to be extensively conducted and majority of companies applied the policy in their production line. However, most analysis and method suggested in published literatures were done based on mathematical computation rather than focussing on solution to real problems in the industry. This normally would lead to the problems in understanding by the practitioner. Therefore, this paper presented researches on PM planning and suggested on the methods that are practical, simple and effective for application in the real industry.

Originality/value

The originality of this paper comes from its detail analysis of PM planning in term of its research focus and also direction for application. Extensive reviews on the methods adopted in relation to PM planning based on the planning-based such as cost-based, time-based and failure-based were also provided.

Details

Journal of Quality in Maintenance Engineering, vol. 23 no. 2
Type: Research Article
ISSN: 1355-2511

Keywords

Access Restricted. View access options
Article
Publication date: 17 December 2021

Farouq Alhourani, Jean Essila and Bernie Farkas

The purpose of this paper is to develop an efficient and effective preventive maintenance (PM) plan that considers machines’ maintenance needs in addition to their reliability…

328

Abstract

Purpose

The purpose of this paper is to develop an efficient and effective preventive maintenance (PM) plan that considers machines’ maintenance needs in addition to their reliability factor.

Design/methodology/approach

Similarity coefficient method in group technology (GT) philosophy is used. Machines’ reliability factor is considered to develop virtual machine cells based on their need for maintenance according to the type of failures they encounter.

Findings

Using similarity coefficient method in GT philosophy for PM planning results in grouping machines based on their common failures and maintenance needs. Using machines' reliability factor makes the plan more efficient since machines will be maintained at the same time intervals and when their maintenance is due. This helps to schedule a standard and efficient maintenance process where maintenance material, tools and labor are scheduled accordingly.

Practical implications

The proposed procedure will assist maintenance managers in developing an efficient and effective PM plans. These maintenance plans provide better inventory management for the maintenance materials and tools needed using the developed virtual machine cells.

Originality/value

This paper presents a new procedure to implement PM using the similarity coefficient method in GT. A new similarity coefficient equation that considers machines reliability is developed. Also a clustering algorithm that calculates the similarity between machine groups and form virtual machine cells is developed. A numerical example adopted from the literature is solved to demonstrate the proposed heuristic method.

Details

Journal of Quality in Maintenance Engineering, vol. 29 no. 1
Type: Research Article
ISSN: 1355-2511

Keywords

Access Restricted. View access options
Article
Publication date: 9 April 2020

Jozaa Z. ALTamimi, Nora A. ALFaris, Fatima Ail Alghamdi, Hind A. Abu-Hiamed, Nawal A. ALbadr and Lujain Abdulaziz Almousa

The purpose of this study is to investigate the effect of roselle flower extract and date palm pollen on the nutritional and sensory qualities of date palm spathe beverage (DPSB).

217

Abstract

Purpose

The purpose of this study is to investigate the effect of roselle flower extract and date palm pollen on the nutritional and sensory qualities of date palm spathe beverage (DPSB).

Design/methodology/approach

The nutritional composition and sensorial quality of the date palm spathe-based beverage were evaluated. The product was fortified with different concentrations (1 per cent and 5 per cent) of roselle flowers and 1 per cent date palm pollen grains.

Findings

Generally, fortification of the DPSB with roselle flowers only or the combination of roselle flowers and date palm pollen grains significantly affected the nutritional and sensory properties of the products. The total dissolved solids, turbidity and total contents of proteins; fats; carbohydrates; vitamins A, E and C; iron; nickel and copper were highest in the DPSB fortified with a mixture of 1 per cent roselle flower extract and 1 per cent pollen grains and lowest in the DPSB supplemented with 1 per cent roselle flower extract. The manganese and selenium contents were both highest and lowest in DPSB supplemented with 5 per cent and 1 per cent roselle flower extract, respectively. Antioxidant activity was highest in DPSB supplemented with the 5 per cent roselle flower extract and lowest in unfortified DPSB. Boron, molybdenum and zinc contents were highest in unfortified DPSB. All sensory attributes were highest in both the unfortified DPSB and that fortified with 1 per cent roselle flower extract.

Originality/value

While fortification with a combination of 1 per cent roselle flower extract and 1 per cent date palm pollen grains improved the nutritional quality of the DPSB, it negatively affected the sensory attributes of the products.

Details

British Food Journal, vol. 122 no. 7
Type: Research Article
ISSN: 0007-070X

Keywords

Access Restricted. View access options
Article
Publication date: 3 August 2015

Maria Nnyepi, Maurice R. Bennink, Jose Jackson-Malete, Sumathi Venkatesh, Leapetswe Malete, Lucky Mokgatlhe, Philemon Lyoka, Gabriel M. Anabwani, Jerry Makhanda and Lorraine J. Weatherspoon

Identifying and addressing poor nutritional status in school-aged children is often not prioritized relative to HIV/AIDS treatment. The purpose of this paper is to elucidate the…

538

Abstract

Purpose

Identifying and addressing poor nutritional status in school-aged children is often not prioritized relative to HIV/AIDS treatment. The purpose of this paper is to elucidate the benefits of integrating nutrition (assessment and culturally acceptable food supplement intervention) in the treatment strategy for this target group.

Design/methodology/approach

The authors conducted a randomized, double blind pre-/post-intervention trial with 201 HIV-positive children (six to 15 years) in Botswana. Eligibility included CD4 cell counts < 700/mm3 (a marker for the severity of HIV infection), documented treatment with antiretroviral (ARV) drugs, and no reported evidence of taking supplemental food products with one or more added nutrients in the six-month period prior to the study. The intervention (12 months) consisted of two food supplements for ethical reason, one with a higher protein content, bean (bean-sorghum based) group (n=97) and a cereal (sorghum) group (n=104) both of which contained added energy- and micro- nutrients. Anthropometric and biochemical nutritional status indicators (stunting, wasting, underweight, skinfolds for fat and muscle protein reserves, and hemoglobin levels) were compared within and between the bean and the cereal groups pre- and post-intervention separately for children six to nine years and ten to 15 years.

Findings

Older children (ten to 15 years) fared worse overall compared to those who were younger (six to nine years) children in anthropometric and protein status indicators both at baseline and post-intervention. Among children six to nine years, the mid arm circumference and blood hemoglobin levels improved significantly in both the bean and cereal groups (p < 0.01 and p < 0.05, respectively). Although the BMI for age z-score and the triceps skinfold decreased significantly in the bean group, the post-intervention subscapular skinfold (fat stores) was significantly higher for the bean group compared to the cereal group (p < 0.05). Among children ten to 15 years, both the bean and the cereal groups also showed improvement in mid arm circumference (p < 0.001), but only those in the bean group showed improvement in hemoglobin (p < 0.01) post-intervention.

Originality/value

Similar significant nutritional status findings and trends were found for both food interventions and age within group pre- vs post-comparisons, except hemoglobin in the older children. Post-intervention hemoglobin levels for the type food supplement was higher for the “bean” vs the “cereal” food in the younger age group. The fact that all children, but especially those who were older were in poor nutritional status supports the need for nutrition intervention in conjunction with ARV treatment in children with HIV/AIDS, perhaps using a scaled up future approach to enhance desired outcomes.

Details

Health Education, vol. 115 no. 5
Type: Research Article
ISSN: 0965-4283

Keywords

Access Restricted. View access options
Article
Publication date: 1 February 2006

S.A. Oke and O.E. Charles‐Owaba

The purpose of this paper is to work on an analytical approach to test sensitivity of a maintenance‐scheduling model. Any model without sensitivity analysis is a “paper work”…

3301

Abstract

Purpose

The purpose of this paper is to work on an analytical approach to test sensitivity of a maintenance‐scheduling model. Any model without sensitivity analysis is a “paper work” without advancing for wider applications. Thus, the simulation of simultaneous scheduling of maintenance and operation in a resource‐constrained environment is very important in quality problem and especially in maintenance.

Design/methodology/approach

The paper uses an existing model and presents a sensitivity analysis by utilising an optimal initial starting transportation tableau. This is used as input into the Gantt charting model employed in the traditional production scheduling system. The degree of responsiveness of the model parameters is tested.

Findings

The paper concludes that some of these parameters and variables are sensitive to changes in values while others are not.

Research limitations/implications

The maintenance engineering community is exposed to various optimal models in the resource‐constraint‐based operational and maintenance arena. However, the models do lack the sensitivity analysis where the present authors have worked. The work seems significant since the parameters have the boundary values so the user knows where he can apply the model after considering the constraints therein.

Originality/value

The underlying quest for testing the sensitivity of the model parameters of a maintenance scheduling model in a multi‐variable operation and maintenance environment with resource constraints is a novel approach. An optimal solution has to be tested for robustness, considering the complexity of the variables and criteria. The objective to test the model parameters is a rather new approach in maintenance engineering discipline. The work hopefully opens a wide gate of research opportunity for members of the maintenance scheduling community.

Details

International Journal of Quality & Reliability Management, vol. 23 no. 2
Type: Research Article
ISSN: 0265-671X

Keywords

Access Restricted. View access options
Article
Publication date: 2 October 2007

C.A.V. Cavalcante and A.T. de Almeida

The purpose of this paper is to develop a model that permits more rational planning for preventive maintenance, by controlling failures in the specific context of equipment…

1928

Abstract

Purpose

The purpose of this paper is to develop a model that permits more rational planning for preventive maintenance, by controlling failures in the specific context of equipment breakdown. Thus not only the cost and reliability parameters are dealt with, but also the peculiarities of different contexts in which maintenance activities occur. Furthermore, it aims to include Bayesian methodology in the procedure to overcome main difficulties in failure data.

Design/methodology/approach

A multi‐criteria decision‐aiding model capable of overcoming the two main difficulties related to preventive maintenance: establishing a replacement periodicity based on more than one criterion, and the ability to provide a solution in uncertainties situations, has been developed from adaptation of classical models. This model also uses Bayesian elements to address uncertainties during equipment failures.

Findings

The paper finds that in a preventive maintenance planning, as a multi‐criteria decision problem, different types of uncertainties may be identified, which may be categorized as external uncertainties and internal uncertainties. In the proposed model a division of procedures has been established, dealing with external uncertainties first, then the internal uncertainties related to the structure of the problem and analysis of the decision are addressed using the multi‐criteria decision‐making method PROMETHEE III that allows the amplification of the notion of indifference. In this way, a suitable structure to connect two types of uncertainties was structured.

Practical implications

The model will assist the decision‐maker in preventive maintenance planning to take uncertainties into account, seeing the alternatives that are closest, through an amplification of the notion of indifference provided by PROMETHEE III. Furthermore, in practice the proposed model have an impact on maintenance cost and reliability of production plant.

Originality/value

This paper proposes a multi‐criteria decision‐aiding model capable of overcoming the two main difficulties related to preventive maintenance: establishing a replacement periodicity based on more than one criterion; and the ability to provide a solution even when failure data are unavailable or incomplete.

Details

Journal of Quality in Maintenance Engineering, vol. 13 no. 4
Type: Research Article
ISSN: 1355-2511

Keywords

1 – 10 of 310
Per page
102050