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In the steel industry the roll grinding machine has become important for maintenance. The rolls always have surface or shape errors after plastically deforming steel slabs to the steel plate. This error affects the manufacturing quality of the steel plate manufacturing process. There are many parameters for the manufacture of the roll grinding machine, such as speed of roll, speed of grinding wheel...
Changes in environment badly affect the performance of the cellular manufacturing system (CMS). Changes in environment are generally reflected in the demand of the items, which are produced in the CMS. The variation in demand can be characterised probabilistically. Two ways of characterisation of this demand are discrete random product mix and random product demand. This paper suggests that, a better...
Colored Petri net (CPN) is a powerful tool for modeling, simulation and analysis for manufacturing system. As the emergency of Distributed Manufacturing System (DMS), CPN has to be extended to competent for larger and more complex model. Meanwhile, DMS becomes an important issue for industry and how to model a complex manufacturing network for better throughout needs further investigation. This paper...
Flexible manufacturing system (FMS) has been a focal point in manufacturing related research for improving competitiveness. Machine loading problem in FMS is known to be NP-hard problems and its complexity so extensive that even small problems take excessive computational time to reach the optimal solution. Since the problem has been recognized as one of the most important planning problems, it needs...
This research aims to propose a collaborative QFD approach, and to develop a web-based collaborative QFD system. Hence, the proposed system was developed, and an industrial case was chosen to validate the capabilities of the proposed system, which include extraction of advices and comments from cross-field experts, direct connection of the relations between users' needs, and product attributes, elimination...
Following the construction completion of the new infrastructures of sewerage, sewerage rehabilitation planning is the major work. This paper presents a systematic sewerage rehabilitation planning consisting of sewer inspection, diagnosis of pipe defects, grading of sewerage structural conditions, and determination of cost-effectiveness rehabilitation methods and substitution pipe materials. The main...
As service organizations have realized that service is fundamental to establish their competitive advantage, waiting time management has been a subject of much service research. This study aims to explore how waiting time impact on tourist satisfaction in theme parks. The findings from a survey of 102 tourists from the theme park in Shenzhen City in China confirm that perceived waiting time, waiting...
Nowadays, the body of literature has been almost unanimous for the needs of sustainable production and consumption. A Product-Service System (PSS) is a promising and prevalent concept for this purpose, selling an integrated offering of products and services, rather than selling a single product. Even PSS has received a great attention in both academia and practice; there has been a lack of research...
This paper develops a reference framework called iSIM (industrial-oriented Service Innovation Methodology) for service innovation, which focuses on design and plan stage, with its purpose for fostering and developing new service industries. Our experiences on executing a four-year-long project, namely “Development of technology-enabled innovative service business models” sponsored by DOIT, MOEA, Taiwan...
Proposed here is a novel architecture for a fault-tolerant real-time system. We employ a checkpoint rollback strategy with double modular redundancy. Main consideration is given to how to recover from both transient and permanent faults without any built-in fault-detection modules or spare processors. Besides state comparison between duplicated tasks, the system has access to the state of the previous...
There have already been a number of managerial and engineering articles that focus on modularity, but none on the issues that the optimal modularity level of complex systems poses in terms of real options and coordination theory. To fill this gap, we develop a modularity profit model based on real options and coordination theory to examine the trade-off between modularity values and costs especially...
Resource constraint project scheduling problem under stochastic circumstances have been considered in recent decades where uncertainty is modeled by means of activities' duration. In this paper we study an extension of basic stochastic RCPSP in which uncertainty come to play on resource availabilities. We have also pursued preempt-resume mode in case of activities breakdown due to resource infeasibility...
Many software reliability growth models (SRGMs) based on non-homogeneous Poisson process (NHPP) framework have been proposed for estimating the reliability growth of products. However, some concerns regarding the properties of NHPP framework were exposed and discussed while the NHPP models have received considerable attention. Two main concerns are (I) the variance of an NHPP-based model grows as...
We look into project scheduling with expected-NPV objective and stochastic activity durations. Individual activities carry a risk of failure, and an activity's failure can cause the overall project to fail. More than one alternative may exist for reaching intermediate project deliverables, and these alternatives can be implemented either in parallel or sequentially. In this paper, optimal solutions...
We often observe a phenomenon that stochastic characteristics of the software failure-occurrence time or software failure-occurrence time-interval changes notably in an actual testing-phase of a software development process. The testing-time when such phenomenon is observed is called change-point. It is said that the effect of change-point on the software reliability growth process influences accuracy...
This paper demonstrates a mathematical model based on Markov Modeling of a complex multi-state repairable bubble gum production system with an attempt to improve its availability. The preemptive resume priority repair discipline is followed to carry out repairs of sub-units of the system. The failure rates of all the different subcomponents of the system are taken as constant whereas their repair...
This paper investigates a residual-based maintenance policy for a stochastic deteriorating system, which is influenced by a Markovian covariates process. The baseline stochastic deterioration is modeled by a Gamma process, and the covariates process is assumed to be a time-homogeneous finite-state Markov chain. A model similar to the proportional hazards model is used to represent the influence of...
In order to increase a company's competition edge, the main focus of a management strategy is to improve service quality. Indentifying the dimensions of the service quality would definitely help managers in the challenge of improving the service quality. This study is to presents an fuzzy approach to evaluate service quality. Two evaluation indices, optimistic-expectation index (OEI) and pessimistic-expectation...
This paper presents a two-machine flowshop scheduling problem with family sequence-dependent setup times and a common due window. The objective is to minimize the sum of earliness and tardiness according to the common due window. The problem is found to be NP-hard. And a niche genetic algorithm (NGA) with sharing as the population diversity mechanism is developed for it, in which the distance of two...
Construction companies over the last years the have been implementing ERP systems to integrate their business processes and to become more efficient. Due to the complexity of the factors involved in the construction industry, the selection of an ERP system is a difficult process. This paper proposes a methodology applying the fuzzy set theory to the selection process an ERP system for companies within...
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