Temporal Relations in Multimedia Objects: WWW Presentation from HyTime Specification

The representation of temporal relations in multimedia objects is based on models of time that allow the identification and the specification of temporal relations among different media, particularly those relations relevant to the process of multimedia synchronization. Initially, this paper discusses the use of HyTime for the specification of binary temporal relations. Next, the paper discusses an approach to the automatic transformation of the HyTime synchronization specifications into elements to be presented in the context of the World Wide Web environment. Keywords: Media Scheduling and Synchronization; Synchronization Specification; HyTime; WWW presentation. 1. Introduction Research in multimedia systems involves the investigation of problems that arise in the integration of distinct media such as text, images, audio and video. The presentation of continuous media such as audio and video, when components of a multimedia object, requires the correct positioning in time of each ..

Low Complexity Cooperative Multicast Beamforming in Heterogeneous Networks

The increasing popularity of distance education courses, including Massive Open Online Courses (MOOCs), creates a demand for the production of quality video-based educational material. In order to reduce the costs involved in the production of video lectures, several researchers have investigated alternatives for capture and access systems which automatically capture lecture contents to generate corresponding video lectures. We also developed a system for this purpose; however our system generates Interactive Multimedia Learning Objects (iMLO) instead of a traditional (linear) video lecture. The iMLO’s features and its interface are important issues for the development of the capture and access system. Interface aspects, such as which are proper ways to present content for users and which navigation facilities are more useful, are distinctive requirements and may impact the user experience. In this paper we present a novel design for the iMLOs which results from an evolution process supported by feedbacks from the main stakeholders: students and lecturers. The feedbacks have been acquired by analyzing the interaction of students with the iMLOs in real scenarios. Based on these feedbacks, we have identified several design implications. We present the proposed interfaces and proof-of-concepts implementations and report lessons learned during the development of the final design solution, which can guide other designers in the conception of new iMLOs. The whole process is documented by means of Design Rationale.São Paulo Research Foundation – FAPESP (process no. 13/50469-5)CAPESCNPQInternational Conference on Human-Computer Interaction - HCI (2015 Los Angeles) \ud International Conference on Learning and Collaboration Technologies - LCT (2. 2015 Los Angeles

TOWARD SEMANTIC WEB SERVICES AS MVC APPLICATIONS: FROM OWL-S VIA UML

OWL-S is an application of OWL, the Web Ontology Language, that describes the semantics of Web Services so that their discovery, selection, invocation and composition can be automated. The research literature reports the use of UML diagrams for the automatic generation of Semantic Web Service descriptions in OWL-S. This paper demonstrates a higher level of automation by generating complete complete Web applications from OWL-S descriptions that have themselves been generated from UML. Previously, we proposed an approach for processing OWL-S descriptions in order to produce MVC-based skeletons for Web applications. The OWL-S ontology undergoes a series of transformations in order to generate a Model-View-Controller application implemented by a combination of Java Beans, JSP, and Servlets code, respectively. In this paper, we show in detail the documents produced at each processing step. We highlight the connections between OWL-S specifications and executable code in the various Java dialects and show the Web interfaces that result from this process.FAPESPCAPESFINEPCNPqRNPMC

Discrimination of media moments and media intervals: sticker-based watch-and-comment annotation

In this paper we discuss the problem of how to discriminate moments of interest on videos or live broadcast shows. The primary contribution is a system which allows users to personalize their programs with previously created media stickers-pieces of content that may be temporarily attached to the original video. We present the system's architecture and implementation, which offer users operators to transparently annotate videos while watching them. We offered a soccer fan the opportunity to add stickers to the video while watching a live match: the user reported both enjoying and being comfortable using the stickers during the match-relevant results even though the experience was not fully representative.CAPESCNPqFAPESPFINEPMCT/CTI