DOI: 10.3217/jucs-024-03-0249

Authors: Hoon Ko, Seogchan Hwang, Libor Mesicek, Jongsun Choi, Junho Choi, Pankoo Kim

Abstract: This paper is to study how to provide smart services by analyzing each service history based on Cloud computing in smart cities. Normally, users use each smart device to receive their services while they stay in a place. In case they move and visit to other place, the system prepares the service based on their services history. At that time, although the users had visited and had services in past, this visiting may ask other services. Then the existing system usually generates new service, and next it provides the service to the user. However, this method is inefficient, because the system has to accept the number of process whenever all users request the service. In this paper, it suggests the smart service model that it keeps users' services history, which had used them while the user stays to a place. The system catches the user's visiting with the user's contexts in the smart device. The model considers their plan/purpose based on old services, and it decides if they modifies them by editing extra services. It calls the system optimization and the suggesting method shows better efficiency after experimenting.

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DOI: 10.3217/jucs-019-02-0186

Authors: Federico Tomassetti, Marco Torchiano, Lorenzo Bazzani

Abstract: This article presents the knowledge and experience acquired trough the process ofestablishing MDD practices within a small Italian company. Special attention has been devoted to project constraints, perceived risks, and relative mitigation strategies. Moreover the articleevaluates how the introduction of the MDD approach was received by different stakeholders. In particular a structured questionnaire was the instrument used to reveal and collect the perceptionsby different roles involved in the MDD adoption process. The case study considered development of applications conforming to a prescriptive architectural framework, which addresses a complexmulti-tier architecture; the solution aims at describing component composition while avoiding both repeating tasks and writing awkward configurations.

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DOI: 10.3217/jucs-015-05-1023

Authors: Shiguo Lian, Yan Zhang

Abstract: Normally, the multimedia content provider and network service providers are separated in mobile TV systems. The TV programs are broadcasted from the content provider to the mobile terminals through Digital Video Broadcasting Transmission System for Handheld Terminals (DVB-H), and the access information is unicasted from the service provider to the user via General Packet Radio Services (GPRS) networks. Due to the network architecture heterogeneity, protocols variation and algorithms difference, securing mobile TV content is becoming a significant challenge. In this paper, we present the architecture, protocol, user identification and digital right management (DRM) for protecting mobile TV multimedia content. The network architecture describes the integrated DVB-H and GPRS to provide secure mobile TV services. The efficient protocols and algorithms are proposed to encrypt the content and also decrypt the coded content. The user identification is able to identify the legal user by matching the username-password pair or the scanned fingerprint. The DRM is able to protect the data from both DVB-H and GPRS. Following this framework, the illegal usage of the mobile TV services can be efficiently prevented and the real-time multimedia Quality-of-Service (QoS) with respect to delay can be guaranteed. The real implementation has demonstrated the effectiveness of the multimedia content protection in the heterogeneous mobile networks. In addition, the delay is sufficiently low to provide live TV.

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DOI: 10.3217/jucs-014-19-3114

Authors: Jesús Ibáñez, David García, Oscar Serrano

Abstract: This paper presents Musimage, a novel system which displays pictures according to the songs being played at the same time. By using the interface the user selects the songs to be played, but the pictures are automatically selected. For each song to be played, the system selects a set of pictures, according to various criteria corresponding to some features of the song. In this sense, the pictures to be shown are, metaphorically, triggered by the songs.

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