Search results for "Operations"
showing 10 items of 1692 documents
Recent Developments in Heterogeneous Photoreactor Modelling
1991
A selection of recently proposed heterogeneous photoreactors is presented. In some cases efforts have been made for the formulation of models able to describe the photoreactor behaviour with regard to the absorption of radiation. Examples of proposals of both novel photoreactor and models are critically reviewed.
An exact algorithm for preventive maintenance planning of series-parallel systems
2009
Reliability is a meaningful parameter in assessing the performance of systems such as chemical processing facilities, power plant, aircrafts, ships, etc. In the literature, reliability optimization is widely considered during the system design phase and it is carried out by an opportune selection of both system components and redundancy. On the other hand, the problem of maintaining a required level of reliability by an opportune maintenance policy has been poorly examined. The paper tackles this problem for a system whose major components can be maintained only during a planned system downtime. An exact algorithm is proposed in order to single out the set of components that must be maintai…
Integrated Production and Predictive Maintenance Planning based on Prognostic Information
2019
International audience; This paper address the problem of scheduling production and maintenance operation in predictive maintenance context. It proposes a contribution in the decision making phase of the prognostic and health management framework. Theprognostics and decision processes are merged and an ant colony optimization approach for finding the sequence of decisions that optimizes the benefits of a production system is developed. A case study on a single machine composed of several components where machine can have several usage profiles. The results show thatour approach surpasses classical condition based maintenance policy.
Managing Greenhouse Gas Emissions for Airport Inventories: An Overview
2011
For some years now, problems relating to gas emissions that affect climate and result from human activities have assumed a global dimension of large importance. The climate is, indeed, influenced by the concentrations of some pollutants in the atmosphere; these pollutants trap the long wave radiation emitted by the Earth and alter the energy balance, causing an accentuation of the natural greenhouse effect. In this view an inventory of greenhouse gases can become the benchmark against which to measure the achievement of quantitative targets set at the political level in the fight against climate change. Contrary to a general inventory of emissions related with air quality objectives and loc…
The Traceability Study in the Process of Manufacturing the Cheese With Romano Hard Paste
2014
Abstract A constant concern of the scientific research in the field of food safety is the identification of methods, to determine in an objective way, the quality of the food, available on the market. The paper analyzes the traceability concept, the importance of traceability implementation of a traceability system, in an organization within the food chain.
Performance-based research funding: Evidence from the largest natural experiment worldwide
2023
A performance-based research funding system (PRFS) is a nationwide incentive scheme that promotes and rewards university research performance through competition for government funding. The UK’s PRFS, currently the Research Excellence Framework (REF), is considered the oldest, largest and most developed payment-by-results system in academia worldwide. Surprisingly, and despite the strong criticisms, little has been done to quantitatively and casually evaluate the intended and unintended effects of the PRFSs. In this paper, we evaluate the incremental impact of the REF 2014 in the fields of Economics and Business. We use a synthetic control method to compare the performance of UK universitie…
Innovative Research Design – A Journey into the Information Typhoon
2014
Abstract Disasters are often characterized by their sudden onset and complex nature. The need for innovative and trans-disciplinary research that starts from the practice of disaster response is uncontested. Yet, the realities of field research require a rework of research design and processes. In the aftermath of Typhoon Haiyan that hit the Philippines in November 2013, a small team of researchers with different backgrounds came together in an innovative setting to investigate information management for decision support and sensemaking in the field. We combined the research in the field with remote support for logistics, communication and spot analyses. This letter describes our findings i…
Dimensions of scientific collaboration and its contribution to the academic research groups´ scientific quality
2009
11 pages, 3 tables, 3 figures
On the Influence of the Evaluation Methods in Conjoint Design — Some Empirical Results
2000
It is the goal of conjoint analysis to explain and predict preferences of customers (Schweikl 1985). Variants of predefined manifestations of attributes of various product concepts (both real and hypothetical) are created, and these are presented to test persons for evaluation. The contributions (partial benefits) the various attributes make to overall preference (overall benefit) are estimated on the basis of overall preference judgments (Green and Srinivasan 1978).
Resilience practices and patient safety: a multiple case study
2017
Organizations’ resiliency is receiving more and more attention within the operations management academic community because of the general awareness regarding the impossibility to prevent any kind of failure/disaster that may occur in whatever work system. Although healthcare organizations everyday manage those operational failures which treat the patient safety, in healthcare management domain there is a “lack of knowledge” about resilience practices, even if few authors have studied similar concepts, such as the work-around practices. In this paper we present an exploratory study we have conducted within two Italian hospitals to comprehend the main capabilities which enable healthcare resi…