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Martín-Díaz, Octavio

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omartindiaz@us.es

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Martín-Díaz

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Octavio

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University of Sevilla
Dpto. Lenguajes y Sistemas Informáticos ETS. Ingeniería Informática – Universidad de Sevilla
University of Seville, Spain
Universidad de Sevilla, España
Dpto. Lenguajes y Sistemas Informáticos ETS. Ingeniería Informática – Universidad de Sevilla 41012 Sevilla, España – Spain
Universidad de Sevilla, Spain

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Mostrando 1 - 6 de 6
  • Artículo
    Towards a Comprehensive Purchasing Model for Cloud Services
    Martín-Díaz, Octavio; Fernández Montes, Pablo; García, José María; Ruiz Cortés, Antonio. Actas de las XI Jornadas de Ciencia e Ingeniería de Servicios (JCIS 2015), 2015-09-15.
    The Cloud Service Market has evolved into a complex landscape that challenges the decision making of users as they develop their purchasing process. In particular, we explore the case of cloud infrastructure (IaaS) providers as an example of heterogeneous variety of purchasing options and discounts; this variability represents an important drawback during the decision making process where there is a need to compare and select the best option. In this work, we define a common model to describe purchasing models from different providers taking into account such heterogeneity. This purchasing model represents a first step towards the automated support of decision making problems during the purchasing process. In order to illustrate our approach we apply the model in a real case study of IaaS purchasing.
  • 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
    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
    Automatic Generation of Purchasing Plans for Cloud Services
    Martín-Díaz, Octavio; García, José María; Fernández Montes, Pablo; Ruiz Cortés, Antonio. Actas de las XII Jornadas de Ciencia e Ingeniería de Servicios (JCIS 2016), 2016-07-13.
    The myriad of cloud service providers, as well as their overwhelming variety of configuration and purchasing options, result in a highly complex purchasing scenario. Furthermore, users may specify their needs for cloud services provisioning with a certain scheduling restrictions. There is a need for an automatic support for obtaining an appropriate purchasing plan, which takes into account both service configurations and scheduling needs, while allowing the comparison among different providers and their various offerings. In this work, we present an automatic purchasing plan generator, which analyzes cloud service offerings from several providers to obtain an optimized purchasing plan according to user needs. From the obtained purchasing plan, our solution can provide the corresponding charge plan, possibly including discounts, which serves the purpose of comparing offerings to get the best option.
  • 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.