Autor:
Müller, Carlos

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cmuller@us.es

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Müller

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Carlos

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I3US Institute, Universidad de Sevilla, Spain
University of Seville, Spain
Dpto. Lenguajes y Sistemas Informáticos, Universidad de Sevilla, Spain
University of Seville, Universidad de Sevilla, Spain
University of Seville
Universidad de Sevilla, Spain

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Mostrando 1 - 6 de 6
  • Artículo
    A Common Reference Model for Cloud Services Customer Agreements
    García, José María; Martín-Díaz, Octavio; Müller, Carlos; Fernández Montes, Pablo; Ruiz Cortés, Antonio. Actas de las XVII Jornadas de Ciencia e Ingeniería de Servicios (JCIS 2022), 2022-09-05.
    Services in cloud computing are always used under the legal terms defined in their customer agreements. Providers have to specify their terms considering applicable jurisdictions and regulations, using varying terminologies that make their compliance checking and analysis operations difficult to generalize and automate. In this paper, we present a reference model as a first step towards obtaining a common specification that will facilitate the operationalization of the service terms included in CAs, while enabling the alignment of the different terminologies used by service providers.
  • Artículo
    Towards Assessing Open Source Communities’ Health using SOC Concepts
    Franco-Bedoya, Oscar; Oriol, Marc; Müller, Carlos; Marco, Jordi; Fernández Montes, Pablo; Resinas Arias de Reyna, Manuel; Franch, Xavier; Ruiz Cortés, Antonio. Actas de las XI Jornadas de Ciencia e Ingeniería de Servicios (JCIS 2015), 2015-09-15.
    Quality of an open source software ecosystem (OSS ecosystem) is key for different ecosystem actors such as contributors or adopters. In fact, the consideration of several quality aspects(e.g., activeness, visibility, interrelatedness, etc.) as a whole may provide a measure of the healthiness of OSS ecosystems. The more health a OSS ecosystem is, the more and better contributors and adopters it will gather. Some research tools have been developed to gather specific quality information from open source community data sources. However, there exist no frameworks available that can be used to evaluate their quality as a whole in order to obtain the health of an OSS ecosystem. To assess the health of these ecosystems, we propose to adopt robust principles and methods from the Service Oriented Computing field.
  • Artículo
    Supporting Compensations with WS-Agreement
    Müller, Carlos; Fernández Montes, Pablo; Martín-Díaz, Octavio; Gutierrez, Antonio M.; Resinas Arias de Reyna, Manuel; Ruiz Cortés, Antonio. Actas de las XII Jornadas de Ciencia e Ingeniería de Servicios (JCIS 2016), 2016-07-13.
    During the last years the use of service level agreements (SLA) is rising uncontrollably to describe the rights and obligations of parties involved in service provisioning (typically the service consumer and the service provider); amongst other information, SLA could define guarantees associated with the idea of service level objectives (SLOs) that normally represent key performance indicators of either the consumer or the provider. In case the guarantee is under or over fulfilled SLAs could also define some compensations (i.e. penalties or rewards). In such a context, there have been important steps towards the automation of the analysis of SLAs. One of these steps is a characterization model of SLAs with compensations proposed by the authors in a previous work; and another step is the standardisation effort in the SLAs notation made by WS-Agreement. However, real-world SLAs includes complex concepts that must be considered, namely: (i) SLA terms that specify compensations without an explicit SLO; and (ii) a limit for the compensations. In this paper we extend our prior characterization model considering these complex concepts. Specifically, (i) we provide up to five real-world scenarios whose SLAs incorporate aforementioned new concepts; (ii) we extend our model for compensable guarantees considering terms without an explicit SLO; and (iii) we provide a novel WS-Agreement-based syntax to model SLAs with compensations considering these concepts. These contributions aim to establish a foundation to elaborate tools that could provide an automated support to the modelling and analysis of SLAs with compensations.
  • Artículo
    A Service Level Agreement Driven Framework to Customise Cloud Service Billing
    García, José María; Martín-Díaz, Octavio; Fernández Montes, Pablo; Müller, Carlos; Ruiz Cortés, Antonio. Actas de las XV Jornadas de Ciencia e Ingeniería de Servicios (JCIS 2019), 2019-09-02.
    Cloud service providers offer to their customers a variety of pricing policies, which range from the simple, yet widely used pay-as-you-go schema to complex discounted models. When executing the billing process, stakeholders have to consider usage metrics and service level objectives in order to obtain the correct billing and conform to the service level agreement in place. The more metrics, discount and compensations rules are added to the pricing schema, the more complex the billing generation results. In this paper we present a monitoring-based solution that enables the dynamically definition of both service level objectives and discount rules, so that providers can customise the billing generation process in terms of the service level agreement they offer. We validate our proposal in a real-world scenario, introducing a micro-service based software solution deployed in a Kubernetes cluster.
  • Artículo
    Towards a Model-based Regulatory Compliance Checking of Customer Agreements: A Case Study
    Martín-Díaz, Octavio; Müller, Carlos; García, José María; Fernández Montes, Pablo; Ruiz Cortés, Antonio. Actas de las XVIII Jornadas de Ciencia e Ingeniería de Servicios (JCIS 2023), 2023-09-12.
    Services in cloud computing are used under the legal terms defined in their customer agreements. Providers have to specify their terms considering applicable regulations. However, varying terminologies make checking regulatory compliance and other analysis operations difficult to generalize and automate. In this paper, we present a case study for checking the compliance of the Google Maps customer agreement with the European General Data Protection Regulation (GDPR). To do so, we use a reference model to obtain the models for both documents, and check their regulatory compliance. Finally, we also discuss the challenges for automation found in this case study.
  • Artículo
    Devising an SLA-Aware Methodology to Improve Process Performance
    Müller, Carlos; Cho, Minsu; Fernández Montes, Pablo; Song, Minseok; Resinas Arias de Reyna, Manuel; Ruiz Cortés, Antonio. Actas de las XIII Jornadas de Ciencia e Ingeniería de Servicios (JCIS 2017), 2017-07-19.
    Aiming to be as competitive as possible, organisations are always pursuing to improve their business processes applying corrective actions when needed. However, the actual analysis and decision making for those actions is typically a challenging task relying on extensive human-in-the-loop expertise. Specifically, this improvement process usually involves: (i) to analyse evidences to understand the current behavior; (ii) to decide the actual objectives (usually defined in Service Level Agreements -SLAs- based on intuition) and (iii) to establish the improvement plan. In this ongoing work, we aim to propose a data-driven and intuition-free methodology to define an SLA as a governance element that specifies the service level objectives in an explicit way. Such a methodology considers process performance indicators that are analysed by means of inference, optimization, and simulation techniques. In order to motivate and exemplify our work we address a Healthcare scenario.