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In this study, we propose a stochastic model for estimating elevator performance criteria from the average number of passenger arrivals. We present a basic framework for our model and try to construct a mathematical formulation. More specifically, a probability distribution of service times for one operation is formulated, where the elevator starts service for the first passenger, finishes all services,...
Due to the increase in environmental concerns and the environmental regulations enacted by governments, green supply chain has received more attention. In this paper, a mixed-integer linear programming model is presented for supply chain planning under emission trading scheme in which carbon footprints is considered in transportation, storage and production. Moreover, since machine upgrade would influence...
This study illustrates an estimation tool for software test that provides the estimated time and the cost of any sort of software test project. There are different well-recognized estimation tools for software development process [9], however, there remains a lack of standard tools for estimation of Software Test phase. Therefore, the authors developed a web base tool (www.4beats.net/tpet/) in order...
This paper explains attributes that can affect people's behavior in evacuation decision-making from Mount Merapi eruption, starting from pre-evacuation phase, vehicle selection phase, to evacuation route selection phase to reach a safe point. These factors were obtained through previous research, relevant to the characteristics of communities around Mount Merapi in facing an emergency evacuation from...
During the use phase of Product-Service Systems (PSS) various kinds of usage data describing the interaction of user and PSS are collected. This information could be used to design PSS tailored to the needs of the users, but in industry this possibility is not utilized due to a lack of support for the analysis of the data. In this paper we present an approach and a model for systematically integrating...
This paper deals with the supply planning for two level assembly systems under stochastic lead time and random failure machine. The objective is to determine the optimal supply planning of the assembly system while considering the maintenance actions and then to study their impact on the optimal release dates for the components at level 2. The optimal supply planning minimizes the total cost which...
Disassembly planning aims to determine the quantity of end-of-life products in order to satisfy the demand of leaf items over a given planning horizon while minimizing several costs. Disassembly planning problem with two levels, multi-products type and capacity constraints is treated by developing a linear programming model. The objective of this model is to minimize the sum of the fixed costs of...
The resource transfer problem (RTP) is a generic framework for integrated scheduling and routing problems, which allows for modeling and solving complex scheduling and rich vehicle routing problems as well as their hybrids in a unified way. Many constraints and specific requirements arising in scheduling and routing applications are covered by the RTP. Basically, the problem consists in scheduling...
In the recreational vehicle rental business, the problem of preparing a schedule for each vehicle in the fleet (by assigning accepted bookings to available vehicles over the planning horizon) is known as the recreational vehicle scheduling problem (RVSP). The problem belongs to the class of minimum cost multicommodity network flow problems which is known to be NP-hard. A formulation of the RVSP from...
Reverse logistics is an activity associated with a product/service after the point of sale, the ultimate goal to optimize or make more efficient aftermarket activity. Enterprises that have implemented reverse logistics have been able to enhance consumer service and response times, minimize environmental influences by minimizing waste and enhance complete corporate citizenship. In this connection,...
QFD is a well-known tool that forms a cross-functional planning process to transform customers' needs into detailed requirements. However, it is not that famous in the field of smart applications since technical people usually rely on customer relationship management people to identify their customers' needs and work accordingly. This article describes how public sector entities can use QFD to identify...
Lean Six Sigma is a popular approach that promotes the improvement of systems, processes, or any other type of entity. On the other hand, quality management systems based on the ISO 9001 standard encourage organizations to adopt various forms of improvement to consistently enhance its overall performance, to better be able to meet customer and other stakeholder requirements, as well as to address...
Aggregate production planning is a planning process and control of entire production activities to meet the variable demands of aggregate products. The goal is to determine the production and inventory levels to minimize the total production cost with limited resources of workforce and equipment. On the other hand, the aim of maintenance planning is to improve the efficiency of equipment to satisfy...
Market trends of the last two decades showed a high demand for customer innovated products. The production of individualized batch-size-one products requires a production planning and control (PPC) paradigm shift. This paper therefore provides an insight into requirements for PPC of customer innovated products. Customer-specific order processing, an approach to time and capacity planning as well as...
Emergent changes are common in large engineering projects and in such dynamic project environments planning and documentation work are often deprioritized in favor of actionable decisions. Previous research has failed to look at the planning and documentation problem as a sociotechnical system as it relates to project managers' and engineer's practical work. In this article, a single case study approach...
Production facilities deliver value as subsets of larger corporate entities with a key enabler being systems, inclusive of Enterprise Resource Planning (ERP) and Manufacturing Systems. This research focuses on the development of an evaluation toolset for Manufacturing Execution Systems maturity, specifically determining a ‘Business Units’ maturity relative to a fully automated corporate process enablement...
Nowadays, effective and accurate analysis of customer requirements (CRs) is vital in the new product development process, especially in the early design stage, where corresponding changes can be made easily into the further development stages. Quality function deployment (QFD), acting as a customer-centric product development tool, is widely utilized in the product planning stage. Despite its “House...
This paper presents a simulation-based optimisation approach for planning railway hump yard operations. A hump yard is used for processing carriages (cars) brought by incoming trains, through a set of classification tracks, into newly formed outbound trains. There are specific constraints on the order in which each operation can be carried out, as well the standing order of cars in each outbound train...
The number and frequency of project activities increase in daily working life. Consequently, the significance of project success gains in importance which requires high accuracy of the project results regarding time / progress, budget and resources. A foundation of project success is built by project planning - especially by project resource planning. Objective resource planning is based on project's...
Critical success factors (CSFs) are factors that dictate the successful accomplishment of an organization's vision, mission and strategy, if performed exceptionally well. The aim of the current research was to develop a rank ordering of CSFs of building maintenance for the Part I municipalities in Namibia. A questionnaire survey and interviews were used to invite respondents (managers, supervisors...
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