Search results
1 – 10 of over 170000Kong Fah Tee and Ejiroghene Ekpiwhre
The purpose of this paper is to propose and confer a strategic cost model as a concept for good decision making for highway asset treatment in the transport industry.
Abstract
Purpose
The purpose of this paper is to propose and confer a strategic cost model as a concept for good decision making for highway asset treatment in the transport industry.
Design/methodology/approach
The paper is based on asset performance condition and treatment renewals using a five-point performance for developing prospective treatment strategies. The strategic cost model is presented in the similitude of picturesque and its outcomes via an exploratory data analysis.
Findings
The results articulate the best maintenance plan for the forthcoming and future years. The strategic cost model uses the combination of the current condition band, the sample area and likely treatment cost for proposing the optimal treatment solution based on consideration of desired treatment level.
Practical implications
The strategic cost model is suitable for outlining the asset performance condition, treatment renewals and analytical cost optimisation. The formulated analytical cost model and developed prospective strategies enable good decision making, long-term contract negotiations and whole life cost maintenance and management.
Originality/value
Embracing eminent performance condition from the research area of lifecycle planning and deterioration models of a physical asset, a prospective cost strategy for asset maintenance is proposed in the study. The resultant treatment strategies using the analytical approach portray the ability that enables the adaptation of expected outcomes.
Details
Keywords
The Equal Pay Act 1970 (which came into operation on 29 December 1975) provides for an “equality clause” to be written into all contracts of employment. S.1(2) (a) of the 1970 Act…
Abstract
The Equal Pay Act 1970 (which came into operation on 29 December 1975) provides for an “equality clause” to be written into all contracts of employment. S.1(2) (a) of the 1970 Act (which has been amended by the Sex Discrimination Act 1975) provides:
Kong Fah Tee, Ejiroghene Ekpiwhre and Zhang Yi
Automated condition surveys have been recently introduced for condition assessment of highway infrastructures worldwide. Accurate predictions of the current state, median life…
Abstract
Purpose
Automated condition surveys have been recently introduced for condition assessment of highway infrastructures worldwide. Accurate predictions of the current state, median life (ML) and future state of highway infrastructures are crucial for developing appropriate inspection and maintenance strategies for newly created as well as existing aging highway infrastructures. The paper aims to discuss these issues.
Design/methodology/approach
This paper proposes Markov Chain based deterioration modelling using a linear transition probability (LTP) matrix method and a median life expectancy (MLE) algorithm. The proposed method is applied and evaluated using condition improvement between the two successive inspections from the Surface Condition Assessment of National Network of Roads survey of the UK Pavement Management System.
Findings
The proposed LTP matrix model utilises better insight than the generic or decoupling linear approach used in estimating transition probabilities formulated in the past. The simulated LTP predicted conditions are portrayed in a deterioration profile and a pairwise correlation. The MLs are computed statistically with a cumulative distribution function plot.
Originality/value
The paper concludes that MLE is ideal for projecting half asset life, and the LTP matrix approach presents a feasible approach for new maintenance regime when more certain deterioration data become available.
Details
Keywords
XiaoHu Wang and Kuotsai Tom Liou
This study assesses the change in states’ financial condition by examining their financial data in fiscal years (FY) 2003 and 2004. It explores and explains how much the change…
Abstract
This study assesses the change in states’ financial condition by examining their financial data in fiscal years (FY) 2003 and 2004. It explores and explains how much the change was, how it occurred, and whether and how closely the change might respond to states’ socioeconomic development. The study finds that states’ financial condition varied significantly from FY 2003 to FY 2004. Changes in different aspects of financial condition are interrelated, although these changes may not occur simultaneously at the same pace. The change in financial condition may result from the multi-year cumulative socioeconomic development in personal income and employment, but not in population. The impact of personal income and employment on financial condition of a government is likely long term; it may take 3-4 years for the growth in personal income and employment to benefit a government’s financial condition. The results also suggest that the cumulative improvement of personal income and employment for consecutive years prior to a fiscal year is more likely to improve the financial condition of that year than a personal income or employment increase that follows an up-and-down pattern of growth. These findings can be used to develop effective strategies to improve financial conditions in government.
Most of the literature on the topic of alcohol consumption and externalities related to it identify adverse effects. The effects of these possible externalities on government…
Abstract
Purpose
Most of the literature on the topic of alcohol consumption and externalities related to it identify adverse effects. The effects of these possible externalities on government financial condition remain relatively unexplored in the literature. In economics, the theory of social costs related to unrestricted economic behavior such as alcohol consumption has been explored since the early twentieth century which spread into the field of public administration through welfare economics. The paper aims to discuss these issues.
Design/methodology/approach
This paper is a study of the possible effects of alcohol consumption on state financial condition across state governments in the USA, based on a mediation analysis with PROCESS.
Findings
This paper finds that there is a significant mediated effect of alcohol consumption on state financial condition through some economic and demographic variables. The paper explores these findings as well as future research.
Originality/value
This is the first paper that takes an interdisciplinary approach to the social cost and public finance literature with a specific focus on alcohol consumption.
Details
Keywords
REINI WIRAHADIKUSUMAH, DULCY M. ABRAHAM and JUDY CASTELLO
Finding the optimal solution to address problems in sewer management systems has always challenged asset managers. An understanding of deterioration mechanisms in sewers can help…
Abstract
Finding the optimal solution to address problems in sewer management systems has always challenged asset managers. An understanding of deterioration mechanisms in sewers can help asset managers in developing prediction models for estimating whether or not sewer collapse is likely. The effective use of deterioration prediction models along with the development and use of life cycle cost analysis (LCCA) can contribute to the goals of reducing construction, operation and maintenance costs in sewer systems. When sewer system maintenance/rehabilitation options are viewed as investment alternatives, it is important, and in some cases, imperative, to make decisions based on life cycle costs instead of relying totally on initial construction costs. The objective of this paper is to discuss the application of deterioration modelling and life cycle cost principles in sewer system management, and to explore the role of the Markov chain model in decision making regarding sewer rehabilitation. A test case is used to demonstrate the application of the Markov chain decision model for sewer system management. The analysis includes evaluation of this concept using dynamic programming and the policy improvement algorithm.
Details
Keywords
Using a case study for electrical power equipment, the purpose of this paper is to investigate the importance of dependence between series-connected system components in…
Abstract
Purpose
Using a case study for electrical power equipment, the purpose of this paper is to investigate the importance of dependence between series-connected system components in maintenance decisions.
Design/methodology/approach
A continuous-time Markov decision model is formulated to find a minimum cost maintenance policy for a circuit breaker as an independent component while considering a downstream transformer as a dependent component. Maintenance of the dependent component is included implicitly in terms of the costs associated with certain state-action pairs. For policy and cost comparisons, a separate model is also formulated that considers only the circuit breaker as the independent component. After uniformizing the continuous-time models to discrete time, standard methods are used to solve for the average-cost-optimal policies of each model.
Findings
The optimal maintenance policy and its cost differ significantly depending on whether or not the dependent component is considered.
Research limitations/implications
Data used are from manufacturer databases; additional model validation could be conducted if applied to an electric utility asset fleet within their generation, transmission, and/or distribution system. This model and methodology are already being applied in other contexts such as industrial machinery and equipment, jet engines, amusement park rides, etc.
Practical implications
The outcome of this model can be utilized by asset and operations managers to make maintenance decisions based on prediction rather than more traditional time- or condition-based maintenance methodologies. This model is being developed for use as a module in a larger maintenance information system, specifically linking condition monitor data from the field to a predictive maintenance model. Similar methods are being applied to other applications outside the electrical equipment case detailed herein.
Originality/value
This model provides a structured approach for managers to decide how to best allocate their resources across a network of inter-connected equipment. Work in this area has not fully considered the importance of dependency on systems maintenance, particularly in applications with highly variable repair and replacement costs.
Details
Keywords
Presents the thoughts on decision processes of Chester I. Barnard, one of the century’s greatest management theorists. Includes his classic article, “Mind in everyday affairs”;…
Abstract
Presents the thoughts on decision processes of Chester I. Barnard, one of the century’s greatest management theorists. Includes his classic article, “Mind in everyday affairs”; his unpublished book, “The Significance of Decisive Behaviour in Social Action”; his correspondence with Herbert Simon, and significant comments found in his personal papers.
Details
Keywords
Guillermo A. Riveros and Manuel E. Rosario-Pérez
The combined effects of several complex phenomena cause the deterioration of elements in steel hydraulic structures (SHSs) within the US lock system: corrosion, cracking and…
Abstract
Purpose
The combined effects of several complex phenomena cause the deterioration of elements in steel hydraulic structures (SHSs) within the US lock system: corrosion, cracking and fatigue, impact and overloads. Predicting the future condition state of these structures by the use of current condition state inspection data can be achieved through the probabilistic chain deterioration model. The purpose of this study is to derive the transition probability matrix using final elements modeling of a miter gate.
Design/methodology/approach
If predicted accurately, this information would yield benefits in determining the need for rehabilitation or replacement of SHS. However, because of the complexity and difficulties on obtaining sufficient inspection data, there is a lack of available condition states needed to formulate proper transition probability matrices for each deterioration case.
Findings
This study focuses on using a three-dimensional explicit finite element analysis (FEM) of a miter gate that has been fully validated with experimental data to derive the transition probability matrix when the loss of flexural capacity in a corroded member is simulated.
Practical implications
New methodology using computational mechanics to derive the transition probability matrices of navigation steel structures has been presented.
Originality/value
The difficulty of deriving the transition probability matrix to perform a Markovian analysis increases when limited amount of inspection data is available. The used state of practice FEM to derive the transition probability matrix is not just necessary but also essential when the need for proper maintenance is required but limited amount of the condition of the structural system is unknown.
Details