Hybrid and multi-cloud become prominent infrastructure strategy of enterprise. However, the complexity of such infrastructure is a considerable challenge. It is common to see that multi-cloud infrastructure is divided into several smaller units to facilitate the management. The division criteria are geolocation, cost, security, etc. Therefore, how to manage application deployment in such partitioned environment is an intriguing topic of multi-cloud management. We propose a policy-based deployment in multi-cloud infrastructure, which contains policy evaluation and TOSCA standard based orchestration. The system architecture is introduced and a case study with two empirical scenarios is discussed. The results indicate that the proposed policy-based deployment is useful in finding suitable resource and improving deployment efficiency.

This paper states the research done in building a Wildfire Propagation Simulation tool able to present graphically, how the fire will be propagated in case of a wildfire. The core of this tool was developed using Cellular Automata (CA) relayed on mathematical foundations for modeling the propagation and the transition rules of the CA. Also, the mathematical model was combined with a geographical information system provided by Google Maps API, allowing to conduct a simulation that considers the kind and density of vegetation in a specific zone of interest. Finally, we define and perform a full simulation providing information for managing and predicting wildfires and, the future works derived from this research.

This paper describes a proof of concept of a Fast-Data architecture to generate early response alerts on unforeseen events. For achieving that, in this work is presented the implementation of a fully integrated system capable to handle and process streaming data in order to generate an alert response for each generated event. The deployment stated are composed by a simulated wireless sensor network for generating environmental values, a centralized Kafka server for data segmentation and a machine learning model deployed in a Spark cluster for generating the emergency alerts. Also, a simulation was conducted assuming that a fire had affected the simulated scenario in order to determine and evaluate the system's behavior. Finally, the classification model is presented as an early system alternative based on real-time processing and can be used in different areas of occupational safety.

This paper presents a simulation that models the satisfactory evacuation index of elderly people in case a building structure is affected by an earthquake. The simulation considers some parameters like earthquake magnitude, Body Mass Index (BMI), person location inside the building, and current evacuation routes. To determine if a person inside the building could or not go out of it, the simulation uses a dataset of people age, genre and location in the building, also, it defines two scenarios, the first where people are located only in the base floor infrastructure, and the second, where people are spread out through various floors of the building.

Over the last few years, videoconferencing systems have experienced several changes that enable videoconferencing applications in personal devices to a high number of users. To efficiently attend this high and variable demand, deploying distributed videoconferencing servers in cloud-based infrastructures is highly recommended. However, videoconferencing systems have particular characteristics that impede the application of regular resource scheduling solutions used in other kinds of distributed environments. In this paper, we propose a methodology to design and evaluate scheduling strategies adapted to the necessities of each specific scenario. It involves using a new metric to estimate the resource consumption of each connection and provides a set of coefficients to evaluate the efficiency of the strategy. We test the methodology in a real setup and compare the behavior and performance of three scheduling algorithms. The conclusion is that the proposed methodology allows us to configure decision policies adapted to the requirements and necessities of a range of use cases. Thereby, we achieve a more efficient way of using cloud resources, improving the service performance and saving costs.

P2P streaming today is one of the most challenging techniques to deliver real-time streaming on the Internet. Incentive mechanisms make a crucial part of the P2P algorithms in order to avoid uncooperative and eliminate malicious behavior. In this paper we present a monetary incentive mechanism based on the taxation incentive schemes. We use a model of a P2P streaming service to apply the idea and validate the quantitative effect on both the users' and the provider's welfare in the system. A billing model based on QoS levels for the perceived video that offers a remuneration inventive for the cooperative users, contributes to the P2P streaming because of the two main reasons: increases provider's welfare in terms of monetary benefit and saves infrastructure cost; increases users' welfare in terms of increased cooperation and motivation to participate in the streaming.

Today, telcos and Internet players are obliged to define new business models sustainable. In the telcos, Service Deliver Platform (SDP) is a key logical entity to deliver services and is the point where mix Internet and telco assets. In parallel, Cloud Computing has become a major issue to offer services on demand. In our approach, we tackle a step forward to build up a SDP in the cloud, which can be offered to those operators with lacks in the SDP infrastructure needed to deliver new services to the clients.

This paper proposes a new methodology focused on implementing cost effective architectures on Cloud Computing systems. With this methodology the paper presents some disadvantages of systems that are based on single Cloud architectures and gives some advices for taking into account in the development of hybrid systems. The work also includes a validation of these ideas implemented in a complete videoconference service developed with our research group. This service allows a great number of users per conference, multiple simultaneous conferences, different client software (requiring transcodification of audio and video flows) and provides a service like automatic recording. Furthermore it offers different kinds of connectivity including SIP clients and a client based on Web 2.0. The ideas proposed in this article are intended to be a useful resource for any researcher or developer who wants to implement cost effective systems on several Clouds.

The number of online real-time streaming services deployed over network topologies like P2P or centralized ones has remarkably increased in the recent years. This has revealed the lack of networks that are well prepared to respond to this kind of traffic. A hybrid distribution network can be an efficient solution for real-time streaming services. This paper contains the experimental results of streaming distribution in a hybrid architecture that consist of mixed connections among P2P and Cloud nodes that can interoperate together. We have chosen to represent the P2P nodes as Planet Lab machines over the world and the cloud nodes using a Cloud provider's network. First we present an experimental validation of the Cloud infrastructure's ability to distribute streaming sessions with respect to some key streaming QoS parameters: jitter, throughput and packet losses. Next we show the results obtained from different test scenarios, when a hybrid distribution network is used. The scenarios measure the improvement of the multimedia QoS parameters, when nodes in the streaming distribution network (located in different continents) are gradually moved into the Cloud provider infrastructure. The overall conclusion is that the QoS of a streaming service can be efficiently improved, unlike in traditional P2P systems and CDN, by deploying a hybrid streaming architecture. This enhancement can be obtained by strategic placing of certain distribution network nodes into the Cloud provider infrastructure, taking advantage of the reduced packet loss and low latency that exists among its datacenters.

Since its appearance, peer-to-peer technology has given raise to various multimedia streaming applications. Today, cloud computing offers different service models as a base for successful end user applications. In this paper we propose joining peer-to-peer and cloud computing into new architectural realization of a distributed cloud computing network for multimedia streaming, in a both centralized and peer-to-peer distributed manner. This architecture merges private and public clouds and it is intended for a commercial use, but in the same time scalable to offer the possibility of non-profitable use. In order to take advantage of the cloud paradigm and make multimedia streaming more efficient, we introduce APIs in the cloud, containing build-in functions for automatic QoS calculation, which permits negotiating QoS parameters such as bandwidth, jitter and latency, among a cloud service provider and its potential clients.

Internet is a place nowadays where interoperating services are offered which can be integrated or mashed up in order to fulfill user demands. This paper proposes a way to offer videoconference as a Web service over an interface which can be used by third parties to enrich their applications. This in

In order to allow the development of joint degrees through heterogeneous e-learning systems, we propose a federation services architecture whose implementation will be based on Web services. Our main objective is to allow e-learning systems to be able to work in a collaborative way; combining their data and functionality through the integration of their services. These services will be combined and federated, according to collaboration agreements between Universities. Joint degrees through e-learning systems will allow the development of new joint curricula and the participation in the convergence of higher education

This paper proposes the creation of an architectural layer for integration of all the resources and members participating in a given collaborative activity into a unified framework which is referred as the collaborative environment integration layer (CEIL). This layer is considered a necessary step for integrating with open standards all the collaborative resources or components into a tightly coupled collaborative environment which implements activity orientation. The proposal considers two architectural elements. The first element is the collaborative environment description language (CEDL), which is the formal language for describing all the elements and associated parameters relevant for modeling and managing a collaborative environment. The second one is the collaborative environment management interface (CEMI), which is the unified interface which provides uniform management and configuration of the collaborative components of an environment. This layer includes accurate descriptions of the virtual organizations associated to collaborative activity, including participants, roles, rights, hierarchies, etc being able to model the variety of existing virtual organization models

Computer supported collaborative work (CSCW) has typically been bound within organizations. Groupware applications are designed with organizational structures in mind, in a top-down approach that predicts communication and collaboration interactions between people. With Internet adoption in society, CSCW overflows organizational borders towards Internet supported collaborative work (ISCW), where the organization of work becomes decentralized, centered on individual interests and pretty dynamic. This paper proposes a Web collaboration architecture for the new Web environment. The article reviews common groupware problems and reflects recent organizational changes. It presents Web 2.0 features and technical state-of-the-art. Then, it describes the architecture proposed, to finish with conclusions and future research lines

This case study summarizes the demonstration of a semantic network of interoperable educational systems referred to as Smart Space for Learningtrade. We started connecting several educational nodes in projects such as Elena, Prolearn, and Icamp. Integration was achieved by using the interaction standard SQI, common schemas for querying and results presentation, and query exchange language, e.g. QEL. The paper particularly focuses on how heterogeneous nodes can be made interoperable by reusing generalizations of mediating components - building blocks for a Smart Space for Learningtrade

Social applications associate a set of user defined keywords named tags when publishing social objects in order to locate them later. We propose T-DHT, a hybrid unstructured-structured DHT based approach, to cope with the high demanding requirements of social applications, in a fully scalable, distributed and balanced way. T-DHT behaves as a structured DHT when publishing "tag, social-object" associations, and as an unstructured filter driven network when searching for the social-objects by means of any tag combination. The publishing process stores tag information across node links in order to drive adequately the later search operations in at most O(Log(N)). The search process takes at most O(logN) node hops for any tag combination and uses the previously stored node link tag information. Although T-DHT has been devised to build a scalable social application infrastructure, it can also be applied to solve general peer-to-peer keyword search problems

Isabel is a P2P like multipoint group collaboration tool for the Internet, which implements an innovative service concept for synchronous collaborations based on a flexible and programmable floor control. This approach leads to a more natural and effective management of collaboration sessions. The flexible and programmable floor control incorporates the experience gained in many years of service trials with real users in distributed conferences, classrooms or meetings. The main conclusion after all those trials is that services should use more or less the same media components (audio, video or application sharing), but differ in the floor control model used. The flexible floor control is especially well suited for multipoint audience interconnection in distributed classrooms, conferences, meetings, etc. The development of Isabel started in 1993 for the distribution of the RACE Summer Schools on Advanced Broadband Communication (ABC93-6) where the early versions of this service concept were developed and tuned. The effectiveness of the Isabel service concept has been proven and enhanced since then in many other distributed events, such as Global360x, IDC9x, Global IPv6 Summitts, Telecom I+D, etc. The adaptation of Isabel to the broadband Internet (including VPNs, IPv4/IPv6 transition scenarios, mixtures of unicast and multicast) has reached maturity recently