Jin-Hwan Jeong

Energy-saving set-top box enhancement in BitTorrent networks

BitTorrent is a leading P2P network system for downloading contents. This trend moves the energy use out of the data center and into the homes of content consumers who are also then content distributors. BitTorrent clients must be fully powered-on at all times so that they are part of the swarm. Energy saving mode of the BitTorrent protocol is a critical issue, whether the goal is to reduce energy consumption of consumers or make your data centers room green. In this paper, we explore how the BitTorrent protocol can be changed so that BitTorrent-based IPTV set-top box can hibernate.

Hint file-based implementation of contents navigation methods for set-top box

In this paper, a hint file scheme for contents navigation algorithms specialized for set-top box client is introduced. As a hint file contains overall information of video/audio properties, video frame, and GOP structure, a server can do streaming without parsing elementary streams. Especially, as our scheme aims at the set-top box, a hint file additionally contains information needed for set-top box requests so that a server can process the requests efficiently. This promises great advantages for service providers for set-top box-based systems.

Efficient post-video processing for thin display devices

Display devices of portable devices can express very limited colors so that the dithering at the post-video processing step is inevitable, which degrades greatly the video playback performance. The main cause comes from the huge data size for converting full color RGB to dithered RGB. This paper proposes an efficient post-video processing method that reorders sub-phases of the post-video processing step so as to lighten the computation. This simplifies circuit logic for the post-video processing, and eventually consumer devices drain less battery power for it.

Video block device for user-friendly viewing patterns in IaaS Clouds

Streaming technology based on various service requirements often remains on the elusive benefits of user-friendly video streaming in Cloud computing environments. Cloud computing gives an opportunity to enhance on-demand, dynamic and easily accessible videos. This paper outlines fundamental video block device (VBD) for user-friendly viewing patterns that inherits from user access patterns and provides efficient delivery using BitTorrent protocol.

A privacy enhanced contents sharing in mobile networks

In this paper, we propose an access control model for privacy protection when personal contents are shared in mobile networks via personal CE devices without any centralized server or service provider. We adopt an encryption based content protection with Access Control List (ACL) approach which provides the information about content encryption key only for permitted users. Our scheme is particularly suitable for recent smart phone platforms equipped with hierarchical content structure, which can also communicate with other devices ubiquitously.

Portable Device-Centric Streaming Service

We envision a portable device-centric streaming service system. To cope with the demand for displaying contents stored in a portable device onto a high resolution display device, our system provides an autonomous and seamless device-centric streaming service model. As this model takes pairing phase via Bluetooth and streaming phase via broad band network, consumers do not need to know about specific information of nearby systems for streaming. Along with the user convenience, this approach saves battery power by yielding decoding and frame scaling to the better external device. This promises great convenience for users of HD video recordable consumer electronics.

Cooperative Multimedia Playback Architecture for Pervasive Cellular Phones

Cellular phones as one of the necessities of life has been developed very rapidly, and various services for them are introduced. However, due to the insufficient hardware resources, multimedia services depend on special hardware devices which cause high manufacturing cost and high battery consumption. In this paper, we introduce a software-based multimedia playback architecture that can be used for multimedia services. To realize software-based scheme, we start from video partial decoding and VOCODER timer. With these two tools, we envision multimedia player architecture working with other existing tasks without any modification and without any special hardware device. In experiments, we show that software-base playback is really possible for pervasive cellular phones.

The design of digital items server for processing multi DI clients on ubiquitous environments

To stream adapted contents to a variety of devices such as PDA, PC, HDTV and so on, on ubiquitous environments, digital items (DI) client access DI server to get information for adapted contents streaming and to store data related with streaming service. When a lot of DI client concurrently connect DI server, to increase the performance of the DI server in working process related with adapted streaming, we propose new technique that there are some main controller threads and each main controller thread has its own FIFO, which manages DI messages. Because each main controller thread has its own FIFO, by distributing DI messages to some main controller thread that is less busy, we make DI server keep good performance and condition

On Multiple Description Streaming with Cluster-based Server

The cluster system with shared-nothing storage cannot escape from the problem of skewed request toward specific contents. This paper, therefore, suggests streaming method using MDC (multiple description coding) instead of using single original content; this method is able to cope with skewed request in shared-nothing storage server as well as to continue to provide services in case of the system failure. Also, the system can support adaptive streaming service according to user player type, network status, the load of server, and client