Anonimous cowar. Conflicts due to open participation in a colaborative comunity Simetric ethnography of a cooperative weblog focused in the news’s production through filtering

The present study is the result of an ethnographic research in a cooperative weblog, an open community where anybody can participate. The community’s objective of news’s productio relies in a colaborative system of filtering thouigh which the community hierarchize users’s contributions. Through this filtering system and through the registry mechanism (by which users create a permanent identity) the community segments information’s visibility and credibility depending on the user’s identity, whter he is a registered user or an anonomous one. The study demonstrates how the filtering processes not only hierarchize the information but organize and structre the community.El presente estudio es el resultado de la investigación etnográfica de un weblog colaborativo. Un entorno abierto a la participación y libre expresión de cualquier usuario. La comunidad tiene como objetivo la producción de noticias significativas, para lo cual recurre a un sistema colectivo de filtrado de la información que sirve para jerarquizar las contribuciones de los usuarios. A través de este sistema de filtrado y mediante el mecanismo de registro (por el que los usuarios crean una identidad permanente) la comunidad segmenta la visibilidad y credibilidad de las informaciones según procedan de usuarios registrados o anónimos. El estudio demuestra que los procesos de selección y filtrado no sólo jerarquizan la información, sino que organizan y estructuran socialmente a la comunidad

Injúria, calumnia i dret a la imatge

Injúria, calumnia i dret a la imatg

Pobrecito hablador. Conflictos por la libre participación en una comunidad colaborativa : etnografía simétrica de un weblog colectivo dedicado a la producción de noticias mediante filtrado

El presente estudio es el resultado de la investigación etnográfica de un weblog colaborativo. Un entorno abierto a la participación y libre expresión de cualquier usuario. La comunidad tiene como objetivo la producción de noticias significativas, para lo cual recurre a un sistema colectivo de filtrado de la información que sirve para jerarquizar las contribuciones de los usuarios. A través de este sistema de filtrado y mediante el mecanismo de registro (por el que los usuarios crean una identidad permanente) la comunidad segmenta la visibilidad y credibilidad de las informaciones según procedan de usuarios registrados o anónimos. El estudio demuestra que los procesos de selección y filtrado no sólo jerarquizan la información, sino que organizan y estructuran socialmente a la comunidad.The present study is the result of an ethnographic research in a cooperative weblog, an open community where anybody can participate. The community's objective of news's productio relies in a colaborative system of filtering thouigh which the community hierarchize users's contributions. Through this filtering system and through the registry mechanism (by which users create a permanent identity) the community segments information's visibility and credibility depending on the user's identity, whter he is a registered user or an anonomous one. The study demonstrates how the filtering processes not only hierarchize the information but organize and structre the community

Customer-oriented risk assessment in Network Utilities

For companies that distribute services such as telecommunications, water, energy, gas, etc., quality perceived by the customers has a strong impact on the fulfillment of financial goals, positively increasing the demand and negatively increasing the risk of customer churn (loss of customers). Failures by these companies may cause customer affection in a massive way, augmenting the intention to leave the company. Therefore, maintenance performance and specifically service reliability has a strong influence on financial goals. This paper proposes a methodology to evaluate the contribution of the maintenance department in economic terms, based on service unreliability by network failures. The developed methodology aims to provide an analysis of failures to facilitate decision making about maintenance (preventive/predictive and corrective) costs versus negative impacts in end-customer invoicing based on the probability of losing customers. Survival analysis of recurrent failures with the General Renewal Process distribution is used for this novel purpose with the intention to be applied as a standard procedure to calculate the expected maintenance financial impact, for a given period of time. Also, geographical areas of coverage are distinguished, enabling the comparison of different technical or management alternatives. Two case studies in a telecommunications services company are presented in order to illustrate the applicability of the methodology

Failure mode prediction and energy forecasting of PV plants to assist dynamic maintenance tasks by ANN based models

In the field of renewable energy, reliability analysis techniques combining the operating time of the system with the observation of operational and environmental conditions, are gaining importance over time. In this paper, reliability models are adapted to incorporate monitoring data on operating assets, as well as information on their environmental conditions, in their calculations. To that end, a logical decision tool based on two artificial neural networks models is presented. This tool allows updating assets reliability analysis according to changes in operational and/or environmental conditions. The proposed tool could easily be automated within a supervisory control and data acquisition system, where reference values and corresponding warnings and alarms could be now dynamically generated using the tool. Thanks to this capability, on-line diagnosis and/or potential asset degradation prediction can be certainly improved. Reliability models in the tool presented are developed according to the available amount of failure data and are used for early detection of degradation in energy production due to power inverter and solar trackers functional failures. Another capability of the tool presented in the paper is to assess the economic risk associated with the system under existing conditions and for a certain period of time. This information can then also be used to trigger preventive maintenance activities

Analysis of the impact of the Asset Health Index in a Maintenance Strategy

Hosted by the Johannes Kepler University, Linz, Austria. May 23-24, 2019 - European Safety, Reliability & Data Association (ESReDA)During many years, asset management methodologies used in industry were focused on knowing and analysing the operational control of the daily work and the impact of the maintenance on the availability. Later, the costs turn into the priority, and strategies were focused on assesses a longer lifecycle and optimizing processes and contracts. Finally, recent normative have included concepts as “knowing and managing the risks” and the target is to prioritize the maintenance tasks to the critical assets. However, taking a balanced asset management model for the operational environment, quite a lot of facilities of Oil & Gas sector are reaching the end of their initially estimated lifecycle. New challenges are related to extend the life of the main items of the facilities or at least, to find the optimal replacement moment that guarantees that the maintenance strategy is being optimized. Asset Health Index methodology considers a theoretical lifecycle of an item, in which depending on the proximity to the end of the useful life, the probability of failure increases. But take this theoretical lifecycle as a base, different operation location factors or O&M aspects can modify this period. All these factor are quantified and permit us to calculate a new theoretical profile. This paper is about assess the impact of the AHI into the maintenance strategy optimisation. AHI enables us to compare future alternative cost profiles and assess the impact in the failure probability of the item. As a result, we are able to know the risk that is taken when we enlarge the operation of an item, and the impact in the operational costs

A framework for effective management of condition based maintenance programs in the context of industrial development of E-Maintenance strategies

CBM (Condition Based Maintenance) solutions are increasingly present in industrial systems due to two main circumstances: rapid evolution, without precedents, in the capture and analysis of data and significant cost reduction of supporting technologies. CBM programs in industrial systems can become extremely complex, especially when considering the effective introduction of new capabilities provided by PHM (Prognostics and Health Management) and E-maintenance disciplines. In this scenario, any CBM solution involves the management of numerous technical aspects, that the maintenance manager needs to understand, in order to be implemented properly and effectively, according to the company’s strategy. This paper provides a comprehensive representation of the key components of a generic CBM solution, this is presented using a framework or supporting structure for an effective management of the CBM programs. The concept “symptom of failure”, its corresponding analysis techniques (introduced by ISO 13379-1 and linked with RCM/FMEA analysis), and other international standard for CBM open-software application development (for instance, ISO 13374 and OSA-CBM), are used in the paper for the development of the framework. An original template has been developed, adopting the formal structure of RCM analysis templates, to integrate the information of the PHM techniques used to capture the failure mode behaviour and to manage maintenance. Finally, a case study describes the framework using the referred template.Gobierno de Andalucía P11-TEP-7303 M

Non-Lipschitz differentiable functions on slit domains

It is proved the existence of large algebraic structures –including large vector subspaces or infinitely generated free algebras– inside the family of non-Lipschitz differentiable real functions with bounded gradient defined on special non-convex plane domains. In particular, this yields that there are many differentiable functions on plane domains that do not satisfy the Mean Value Theorem.Plan Andaluz de Investigación (Junta de Andalucía)Ministerio de Economía y Competitividad (MINECO). Españ

Criticality Analysis for Maintenance Purposes: A Study for Complex In‐service Engineering Assets

The purpose of this paper is to establish a basis for a criticality analysis, considered here as a prerequisite, a first required step to review the current maintenance programs, of complex in‐service engineering assets. Review is understood as a reality check, a testing of whether the current maintenance activities are well aligned to actual business objectives and needs. This paper describes an efficient and rational working process and a model resulting in a hierarchy of assets, based on risk analysis and cost–benefit principles, which will be ranked according to their importance for the business to meet specific goals. Starting from a multicriteria analysis, the proposed model converts relevant criteria impacting equipment criticality into a single score presenting the criticality level. Although detailed implementation of techniques like Root Cause Failure Analysis and Reliability Centered Maintenance will be recommended for further optimization of the maintenance activities, the reasons why criticality analysis deserves the attention of engineers and maintenance and reliability managers are precisely explained here. A case study is presented to help the reader understand the process and to operationalize the mode

Socio-economic impacts of the exposure to Roman ceramics in the inland Iron Age communities of the NW Iberian Peninsula: a quantitative approach

How did the first ever exposure to Roman imported material culture at inland sites affect local material culture practices? What does this reveal about the speed and nature of cross-cultural influence between Roman and Iron Age communities? And about the specific dynamics of integration within the Roman Empire of inland sites? Our ability to address these key questions about the exposure of Iron Age communities to the Roman world is hampered by a research bias in classical archaeology towards the study of ceramics contexts from coastal sites. In this paper we present the first replicable quantified contextualised ceramics data analysis to address these questions, through a study of more than 150,000 sherds from inland sites in the northwestern Iberian Peninsula. We conclude that century-long gradual changes in local common wares and amphorae from Iron Age traditions to Roman-inspired forms reflect changing food production and consumption behaviours. This transition is also reflected in an increasing presence of imported Roman goods. Our results suggest very gradual but increasing integration with the Roman world and ceramic data patterns correlate with known events from textual sources: Caesar’s campaign, the Augustan Cantabrian wars, and the Flavian reformsS