Euihyun Paik

The DLNA Proxy System Architecture for Sharing In-Home Media Contents via Internet

This paper proposes a digital living network alliance (DLNA) proxy system, to provide services for accessing and sharing various DLNA-based media contents which are distributed over his/her or others home facilities via home network or the Internet

Design and Implementation of the Location-Based Personalized Social Media Service

Although the conventional Social Network Services (SNS) provides a solution for internetworking social users to share information and social media contents based on the Web, there are further requirements to support increasing demands of social users with commencing Web 2.0 and ubiquitous computing technologies. Especially with increasing popularity of the User Created Contents (UCC) and handheld mobile devices, there are requirements for supporting active media streaming services with smart phones based on the personalized SNS services. In order to overcome the limitations of the traditional SNS services, the paper proposes methods to provide a personalized Social UCC service based on the locality and sociality relations with relationship, active information and knowledge management based on the ontology schemes. To do so, the paper proposes and implements a social media platform that composed of GPS equipped smart phones, a social media server system, and an integrated service ontology for providing the personalized Social UCC service.

EAFR-based DLNA proxy for high-quality video distribution in extended home space

We propose a DLNA proxy for home-to-home content distribution that enables a source DLNA-compliant device to multicast a high-quality video to target ones in different UPnP-enabled home networks by applying a large-scale media distribution scheme to the DLNA architecture. The proposed EAFR scheme helps the DLNA proxy efficiently distribute overall network traffic load for a massive content delivered to the DLNA devices placed on different home networks by utilizing unused forwarding bandwidth on delivery paths, among them based on a multiple multicast trees approach.

Developing Ontology for Intelligent Home Service Framework

Home services are all kind of services which are provided in home environment. Legacy Researches was focused on controlling home devices and appliances. And recent works focus on the multimedia services. In the future, devices existing in the home would infer the status and intention of users and provide intelligent home services without much intervention of users. To do this, there must be context-aware technologies [1]. This research focused on the ontology which is the core technology of the context information management [2]. Through developing ontology for the home services, we classified services into several categories and, described requirements for the service execution. And then, we adopted the ontology for the intelligent home service framework called iHSF. Ontology designed for the home services consists of the concept of users, places (semantic locations), environment around the specific places, devices and individual services and subordinate concepts of them, which all concepts have properties and relations among them [2]. Ontology for the iHSF has form of RDF (resource description framework) [3, 4, 5] and OWL (web ontology language) [6, 7] in order to be interpreted by devices. Ontology should mirror the constantly varying environment of the home dynamically. iHSF using well-designed ontology reacts to the constantly varying .context on a real time basis.

Personalized Recommendation System for the Social Network Services Based on Psychographics

Although various Social Network Services available on the Web, there are additional requirements for sharing systematic knowledge and experiences that are formed in u-Computing environment in relation to the physical location information to support problem solutions more effectively. As the numbers of information available increases, there are more inadequate and junk information which consume efforts and time for information search and sharing. In order to support personalized social network services, there are technical and service oriented requirements for managing and providing accumulative experiences of social users according to their own knowledge and life-style. Such social network services generally implements a recommendation system that provides services based on user history and profiles including statistics information for service customization. Therefore there is probability of producing irrelevant information results because of the fact that the conventional recommendation system does not consider to support a dynamic generation of the context information of users. In order to overcome accuracy problems for the conventional recommendations, the paper proposes a personalized recommendation system using psychographics information, which explains users lifestyle.

Provision of the expressive multisensory adaptation platform for heterogeneous multimedia devices in the ubiquitous home

This paper presents a multimedia service platform to express multisensory media effects for heterogeneous appliances and a home server in the ubiquitous home networks. The platform is equipped with an adaptation technology to process multimedia service based on a home server. The proposed adaptation consists of a multimedia parser, analyzer, device profile gatherer, device selector and a media player. The multisensory adaptation communicates with service modules for integrating the control of various home appliances. The multimedia service supports not only multimedia contents subscriptions but also presents additional sensory effects to the high quality multimedia services for various different homes via the adaptation.

Effective encoding of TV-Anytime metadata using EXI

The TVA metadata allows consumers to find, navigate, and manage contents through a variety of terminal devices including PDR, DTV, and IPTV. In general, a TVA metadata description is delivered from a content provider to a terminal device over a transport link. Because such metadata description can become very large, it is essential to encode each fragment of the metadata description in a compressed format before the delivery and then decode the encoded fragments at the terminal device. This paper proposes a new encoding procedure for TVA metadata based on the EXI and presents performance comparison results between the proposed encoding procedure and the existing TVA encoding procedure.

Location-aware UPnP AV session manager for smart home

In this paper, we design a location-aware UPnP AV session manager1. This system automatically detects a users movement using RFID technology, and then captures or restores his UPnP A/V session information by invoking service actions defined in the UPnP AV architecture. The designed system is based on RFID-based multi-user access control algorithm to reduce both service transition time from a person in service to another person, and unnecessary processing time, by filtering invalid tags.

A Dynamic Conditional Access System for IPTV Multimedia Systems

An IPTV system that transmits contents through anIP network needs to adopt a conditional access system allowingonly authorized subscribers to view premium content as inother Pay-TV systems. IPTV systems adopting one ofconditional access systems provided by a specific major vendorhave a difficulty in changing the conditional access systemloaded on a set-top box or on a removable hardware device,such as Smart card. However, a software download schemethrough an IP network enables an IPTV set-top box to changethe existing conditional access system in a secure way. Thispaper proposes a dynamic conditional access system for anIPTV set-top box that securely downloads cryptographicsoftware and dynamically executes the cryptographic softwarewhen it is required. Therefore, the proposed system enables anIPTV multimedia system to provide seamless conditionalaccess services to IPTV subscribers without rebooting theIPTV set-top box or replacing a hardware security devicewhile changing the running cryptographic software.

Achieving Interoperability in Conditional Access Systems through the Dynamic Download and Execution of Cryptographic Software for the IPTV System

An IPTV system that transmits multimedia contents through the IP network needs to adopt a conditional access system allowing the only entitled subscribers to view the premium content as other pay-TV systems do. Although several standard specifications have been published for interoperable models of conditional access systems, the proposed models are based on the unidirectional or restricted bidirectional broadcasting network and do not utilize the characteristics of the IP network. However, software download scheme through the bidirectional IP network enables it to change existing conditional access systems in a secure way. This paper introduces an interoperable conditional access system that can update any cryptographic software provided by different conditional access system vendors through downloading and executing dynamically the downloaded conditional access software only if the software follows the pre-defined interfaces.