The Wi-Fi broadcast system using the broadcast packet transmits the multimedia contents to many local mobile users in real time and it must use the FEC technology to recover the broadcast packet loss, because Media Access Control layer retransmission is not supported for broadcast packet loss. Equally adding the redundant packet is not very efficient […]
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Intelligence Networking & Computing Lab, Busan, Rep. of Korea
We approach our projects with strategic and creative thinking. We partner with our clients to create big ideas and digital experiences.
Feb
Sep
In the wireless sensor network, there are cluster based routing protocols for the network monitoring like LEACH. In earlier works, the data aggregation periods of these protocols are the same, although each cluster can have different environments or situations for time-varying. Thus, it occurred to inefficiently consume energy in non-interested areas. In addition, it is […]
May
DTN (Delay- or disruption- tolerant networking)is often found in heterogeneous networks, mobile or extreme terrestrial networks, or planned networks in space. In this paper,we examine the metropolitan bus network as a research target of DTN. We analyze the metropolitan bus network through spatial and temporal modeling by reusing the existing database of the Bus Information […]
May
ecent trend in the research of networking in defense development tends to communicate via DDS (Data Distribution Service)-based middleware, since target environments often integrate thousands of nodes through heterogeneous networks. Heterogeneous network often consists of wired and wireless coexisted network; however constructing DDS-based system in the wireless network is challenging work because recent DDS is […]
Aug
This letter presents a hybrid conditional access system (CAS) for advanced terrestrial digital multimedia broadcasting (AT‐DMB). The proposed architecture is characterized by its use of a unified CAS channel and various communication networks for CAS message transmissions. We implement a prototype CAS based on the hybrid architecture, which improves the CAS message transmission efficiency greatly […]
Jul
Time synchronization in wireless sensor networks (WSNs) is a fundamental issue for the coordination of distributed entities and events. Non-deterministic latency, which may decrease the accuracy and precision of time synchronization can occur at any point in the network layers. Specially, random back-off by channel contention leads to a large uncertainty. In order to reduce […]
Jun
As the era of the ubiquitous computing is ushered in, consumers have been primed for a variety of automation applications. Active RFIDs can be used for a number of automation applications because it may also have other sensors to extend its applications. An active RFID instinctively focuses on a long communication range. Nevertheless, active RFIDs […]
May
ISO/IEC 18000-7 Active RFID standard, a single channel system operating at 433 MHz, faces technical difficulties in supporting some recently introduced application demands because of its low transmission rates and vulnerability to radio interference between the readers. We propose a new multi-channel active RFID system operating at the 2.4 GHz band. The special feature of […]
Mar
In the upcoming ubiquitous computing environment, almost every object that needs to be identified will be attached to an radio frequency identification (RFID) tag. Omnipresent RFID tags lead to the concern that huge volumes of RFID data could easily overwhelm related networks and systems. However, for most applications, only a small subset of ID data […]
Feb
This paper introduces a novel approach for extending DMB service area by making use of existing IP networks. DMBonIP Gateway, which provides RTP/SDP based internet streaming service by generating media streams in real time from the DMB ensemble received from the air, is introduced for this purpose. This paper addresses key functional components of DMBonIP […]
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