253,329 research outputs found
Development of an Extended Product Lifecycle Management through Service Oriented Architecture.
Organised by: Cranfield UniversityThe aim of this work is to define new business opportunities through the concept of Extended Product
Lifecycle Management (ExtPLM), analysing its potential implementation within a Service Oriented
Architecture. ExtPLM merges the concepts of Extended Product, Avatar and PLM. It aims at allowing a
closer interaction between enterprises and their customers, who are integrated in all phases of the life cycle,
creating new technical functionalities and services, improving both the practical (e.g. improving usage,
improving safety, allowing predictive maintenance) and the emotional side (e.g. extreme customization) of
the product.Mori Seiki â The Machine Tool Company; BAE Systems; S4T â Support Service Solutions: Strategy and Transitio
Study on thermal model for calculating transformer hot Spot temperature
A power transformer is a static piece of apparatus with two or more windings which, by
electromagnetic induction, transforms a system of alternating voltage and current into another
system of voltage and current usually of different values and at same frequency for the purpose
of transmitting electrical power.
The hot spot temperature depends on instantaneous load and ambient temperature,
winding design and also cooling model. There are two possible methods for hotspot temperature
determination. The first method is to measure the hot spot temperature using a fiber optic, and
other is to calculation the hotspot temperature using transformer thermal models. It was noticed
that the hot spot temperature rise over top oil temperature due to load changes is a function
depending on time as well as the transformer loading (overshoot time dependent function). It has
also been noticed that the top oil temperature time constant is shorter than the time constant
suggested by the present IEC loading guide, especially in cases where the oil is guided through
the windings in a zigzag pattern for the ONAN and ONAF cooling modes. This results in winding
hottest spot temperatures higher than those predicted by the loading guides during transient states
after the load current increases, before the corresponding steady states have been reached.
This thesis presents more accurate temperature calculation methods taking into account
the findings mentioned above. The models are based on heat transfer theory, application of the
lumped capacitance method, the thermal-electrical analogy and definition of nonlinear thermal
resistances at different locations within a power transformer. The methods presented in this
thesis take into account all oil physical parameters change and loss variation with temperature.
In addition, the proposed equations are used to estimate the equivalent thermal capacitances of
the transformer oil for different transformer designs and winding-oil circulations. The models are
validated using experimental results, which have been obtained from the normal heat run test
performed by the transformer manufacturer at varying load current on a 250-MVA-ONAFcooled
unit, a 400-MVA-ONAF-cooled
unit and a 2500-KVA-ONAN-cooled
unit. The results
are also compared with the IEC 60076-7:2005 loading guide method.
Keywords: power transformers, hot spot temperature, top oil temperature, non-linear therma
Methodological Approaches to Modeling Information Architecture of the Organization in the Conditions of Digital Economy
It is significant for businesses, especially in the digital economy, the solution of theoretical and methodological justifications and the development of practical recommendations for building an organization\u27s information architecture as a holistic description of its key strategies, related to business, information, application systems and technologies, and also their impact on the functions and business processes of an organization.
The article discusses issues, related to methodological approaches to modeling an organization\u27s information architectureб using information management tools to help manage innovation in information systems (IS) and information technologies (IT). The relevance of organizational provisions to determine the way, in which a business entity\u27s business model is functionally integrated with the IS architecture is substantiated. The consideration and analysis of the use of industrial standards for describing the architecture of an organization, adopted by such institutions as the International Organization for Standardization (ISO), The Open Group, Institute of Electrical and Electronics Engineers (IEEE), etc. reveal that none of these standards is dominant and does not provide teams, responsible for the architecture development with all the tools, necessary from the methodological point of view and from the point of view of the templates, used to describe the architecture. Recommendations are given on the theoretical and methodological substantiation and construction of the information architecture of an organization as a complete description of its key strategies related to business, information, application systems and technologies, as well as their impact on the functions and business processes of an organization
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Aligning enterprise risk management with business strategy and information systems
Business leaders recognise effective risk management as one of the main success drivers for enterprises. Even though the Enterprise Risk Management (ERM) concept has evolved significantly in the past years, in the aftermath of recent economic crises it became evident some of its critical challenges still need to be addressed. The review of subject literature led to a conclusion that current ERM approaches failed to protect enterprise value in turbulent and risky market conditions. Therefore, this paper aims to provide a conceptual analysis of the most common ERM practices and frameworks, in order to identify their shortcomings and areas requiring development. It is further aimed to provide guidance to business practitioners in implementing more integrated and effective Enterprise Risk Management (ERM) solutions. This research recognises the importance of aligning ERM programmes with business strategies, and with consolidated Information Systems. A âNew Approach ERM Modelâ is developed as guidance for a successful alignment of ERM with enterprise business strategy, and for an effective adaption of Information Systems to requirements of ERM programmes. The âNew Approach ERM Modelâ steers risk management initiatives and strategies in the same direction, and consequently allows enterprises to improve organisational effectiveness, increase shareholders value, and gain competitive advantage in the market
Enabling Distributed Knowledge Management: Managerial and Technological Implications
In this paper we show that the typical architecture of current KM systems re.ects an objectivistic epistemology and a traditional managerial control paradigm. We argue that such an objectivistic epistemology is inconsistent with many theories on the nature of knowledge, in which subjectivity and sociality are taken as essential features of knowledge creation and sharing. We show that adopting such a new epistemological view has dramatic consequences at an architectural, managerial and technological level
Thought for Food: the impact of ICT on agribusiness
This report outlines the impact of ICT on the food economy. On the basis of a literature review from four disciplines - knowledge management, management information systems, operations research and logistics, and economics - the demand for new ICT applications, the supply of new applications and the match between demand and supply are identified. Subsequently the impact of new ICT applications on the food economy is discussed. The report relates the development of new technologies to innovation and adoption processes and economic growth, and to concepts of open innovations and living lab
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