Hayoung Yoon

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Providing on-demand video streaming services to large numbers of nodes in mobile wireless networks is a challenging task. We propose MOVi (mobile opportunistic video-on-demand), a mobile peer-to-peer video-on-demand application based on ubiquitous WiFi enabled devices such as smartphones and Ultra Mobile PCs. MOVi poses new challenges in on-demand video(More)
In this paper, we propose a cross-layered network-adaptive high definition (HD) video streaming system using a sender-driven wireless channel monitoring over the wireless local area network (WLAN) for the digital audio/visual (A/V) home network. For the wireless channel monitoring, an intelligent intermediate sender with an embedded wireless access point(More)
In this paper, we introduce a dynamic admission control (DAC) to protect and maintain QoS-demanding traffic streams in IEEE 802.11e enhanced distributed channel access (EDCA) based wireless home network. The proposed DAC dynamically adjusts to achieve high bandwidth utilization while maintaining the desired QoS in a deteriorative channel condition. The(More)
Existing 802.11 direct link setup (DLS) protocol specifies procedures for direct communication between a pair of stations within the same basic service set (BSS). This eliminates the unnecessary triangular traffic route through an access point and increases the overall effective throughput within the BSS. In this paper, an inter-BSS direct link setup (iDLS)(More)
Fluorescent and magnetic Fe3O4@coordination polymer (Fe3O4@CP) nanochains are synthesized via a simple one-pot solvothermal reaction of magnetite (Fe3O4) and coordination polymer precursors in the presence of an external magnetic field. The shell thickness within Fe3O4@CPs was easily regulated by varying the amounts of coordination polymer precursors used(More)
Repeatable experiments to study the performance or behavior of wireless mobile adhoc network (MANET) systems such as a delay (or disruption) tolerant network (DTN) are challenging tasks. One approach to do this is to build a realistic mobile testbed, on which the mobile devices and test applications or network protocols can be deployed. This testbed(More)
In this paper, we introduce a saturation throughput analysis of IEEE 802.11e enhanced distributed channel access (EDCA) based WLAN under saturation condition. To estimate the wireless channel capacity, we extend a well-known Bianchi model for the multiple access categories (ACs), inner station collision (in other words, virtual collision) handling, and(More)
We previously reported that Skp1, a component of the Skp1-Cullin-F-box protein (SCF) complex essential for the timely degradation of cell cycle proteins by ubiquitination, physically interacts with Bfa1, which is a key negative regulator of the mitotic exit network (MEN) in response to diverse checkpoint-activating stresses in budding yeast. In this study,(More)