Youngho Jeong

A novel protocol for downloadable CAS

This paper presents a novel protocol for downloadable conditional access system (DCAS) which can securely download conditional access (CA) software via bidirectional communication channel. The proposed DCAS protocol uses pre-assigned keys and certificates for mutual authentication between a DCAS headend and DCAS host, and then it shares a session key for encrypting and decrypting CA software to be downloaded to a DCAS host. In order to verify the stability and effectiveness of the proposed protocol, we implement the DCAS protocol simulator. It can emulate the function of DCAS entities and the process of messages for mutual authentication, session key sharing and code downloading. Finally, experimental results indicate that the proposed protocol satisfies the design requirements for DCAS1.

Real Time Traffic Information Service Using Terrestrial Digital Multimedia Broadcasting System

The major contribution of this paper is the implementation of real time traffic and traveler information service through the terrestrial digital multimedia broadcasting (T-DMB) system, which are known to be suitable for the mobile data services as well as audio and video services. The implemented system converts the Korean characteristic traffic information into the transport protocol expert group (TPEG) messages, and provides them to the T-DMB system. By testing the service with the TPEG message decoder implemented in the navigation system on PDA and laptop, it has turned out that it can be used as a highly efficient traffic information service system that could be adopted in Korea as well as in European countries

A novel TPEG application for location based service using terrestrial-DMB

This paper presents a new economic and effective TPEG (transport protocol experts group) application for location based service (LBS) that can be provided in terrestrial-digital multimedia broadcasting (T-DMB) transmission system. We propose a novel point-of-interest (POI) application interoperable with TPEG protocol, and introduce the POI data server/client and the DMB receiver with TPEG decoder implemented by using the proposed protocol. The stability and effectiveness of the proposed protocol is verified through the experimental broadcasting, and the pilot service using the commercial T-DMB network is being provided successfully

An efficient transmission of traffic and traveler information using digital multimedia broadcasting network

This paper introduces an efficient transmission of traffic and traveler information through digital multimedia broadcasting system, which is a multimedia and mobility empowered version of European digital audio broadcasting system. By introducing Korean characteristic traffic information into the transport protocol expert group messages, we could get highly efficient traffic and traveler information system that could be used in Korea as well as in European countries Keywords-component; traffic and traveler information, digital multimedia broadcasting, digital audio broadcasting

A Traveler Information Service Structure in Hybrid T-DMB and Cellular Communication Network

This paper introduces a structure of delivering traveler information service including point of interest information through the terrestrial multimedia broadcasting system, in which, the receiver is connected with cellular communication terminal to enable the interactivity of the service. By combining real time traffic information and point of interest information, we could get an efficient traffic and traveler information service system that could be used for many location based applications

Design and Implementation for Interactive Augmented Broadcasting System

In a typical augmented reality (AR), users can rotate, resize, or move AR objects, usually in application programs on handheld devices. In addition, users can instruct them to do an animation. Moreover, various types of application programs are provided and various ways of interactions are tried out for more natural user experience. On the other hand, in regular TV, an AR-applied TV program may be a composite video of original video and AR objects, which was already processed by the transmit side of broadcasting system and thus the TV viewer cannot influence the representation of TV program. Thus, until now, it can be said that an authentic AR service on TV broadcasting is not practically provided. In this paper, a new alternative paradigm of AR service in TV broadcasting is introduced. To provide an interactive AR experience to the viewer, first of all, we propose that the place where the original video and the augmented objects are composited needs to be moved from the transmit side to the TV terminal. Therefore, all augmented objects should be graphically rendered on the TV terminal. Considering the prerequisite, we propose an augmented broadcasting service system based on a hybrid framework that combines the conventional TV broadcasting and the broadband Internet. In the proposed system, the augmented objects are downloaded and rendered in compliance with instructions described in a metadata. The metadata includes the time information to synchronize the representation of the original video images and the rendered augmented-object images. And the metadata is delivered in compliance with MPEG-2 system. Inevitably, the architecture of the MPEG-2 transmission stream multiplexer should be slightly modified to insert the time information for the synchronously compositing. The metadata should be packetized in compliance with the MPEG-2 system. So, we propose a packetized elementary stream format for the metadata. Additionally, we propose an interaction mechanism using a second-screen device that supports touch-screen capability. With second-screen devices, TV viewers can manipulate the augmented objects displayed on TV screen. Moreover, a lot of additive contents synchronized or correlated to TV programs can be automatically popped up on the screen of second-screen device.

Gaze detection based on head pose estimation in smart TV

In this paper, we propose a new gaze detection method based on head pose estimation in smart TV. First, the face, eyes and center of both nostrils positions are detected by using Adaboost method. After that, the proposed method uses the template matching method to find the position of the users shoulder as well as the left and right boundaries of the face. Based on the positions of the detected shoulder and faces boundary, the horizontal and vertical head poses are estimated. Experimental results show that our method shows a good performance in users gaze detection.

Delivery of New TTI Services over Terrestrial DMB and a Bidirectional network

This paper proposes the network structure and service model to deliver new traffic and travel information (TTI) services over terrestrial digital multimedia broadcasting (T-DMB) and a bidirectional network. We have newly specified a POI (point-of-interest) and a NWS (news information) application services which are perfectly compatible with TPEG (transport protocol expert group) protocols, and implemented T-DMB based TTI systems including TPEG encoder/decoder and a return-channel server system through CDMA as a bidirectional network. In the real-field environment as verifying the proposed services and systems above, we showed their stability and effectiveness by the excellent results in this paper.

New TPEG applications based on digital multimedia broadcasting

The digital multimedia broadcasting (DMB) allows can provide an economical way of massive multimedia data services, thus, it is emerging as an optimal solution to address the several drawbacks of the mobile communication network. Among the data services based on the DMB, the traffic and travel Information (TTI) service has been spotlighted in aspects of economic influence and information usability. For example, the demand of TTI service has dramatically increased due to rapid increase in the number of vehicles and population of frequently traveling on long-weekends. In order to satisfying such a demanding, a transport protocol experts group (TPEG) protocol was developed. However, TPEG has been applied merely to two application areas up to now and there is no consideration to standardize new services very valuable for drivers and travelers. This paper presents new economic and effective point of interest (POI) and news services compatible to TPEG that can be provided in the DMB. To verify the stability of POI and news protocols, we implemented the TTI data server/client, and the DMB/DAB receiver with the TTI decoder. Through the experimental broadcasting in the local DMB network, it is shown that the proposed protocol operates stably and effectively in the navigation system.

Method for efficient CA software provisioning in downloadable conditional access system

A downloadable conditional access system (DCAS) focuses on transmitting conditional access (CA) software into a set-top-box (STB) securely via a bi-directional communication channel. This paper presents the method to provision CA software onto STBs efficiently for the purpose. In order to achieve this goal, we defined the DCAS policy on CA softwares configuration and downloading method, and designed DCAS headend servers which execute authentication and downloading according to the DCAS policy. Especially, a policy server (DPS) which plays an important role of generating and distributing the policy, is presented in detail. Also we implemented the DCAS system and showed the stability and effectiveness by verifying the implemented results in a testbed1.