Jiwei Chen

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— This paper studies the TCP performance with delayed ack in wireless networks (including ad hoc and WLANs) which use IEEE 802.11 MAC protocol as the underlying medium access control. Our analysis and simulations show that TCP throughput does not always benefit from an unrestricted delay policy. In fact, for a given topology and flow pattern, there exists(More)
This paper concerns TCP Westwood (TCPW), a recently developed modification of TCP, in combination with RED queue management. We develop a fluid-flow model of TCPW with RED and use it to study both equilibrium and dynamic features. On the equilibrium side, we identify the scaling of window with loss-probability, and compare it to TCP NewReno. We also use the(More)
— TCP Newreno inefficiency and unfairness in multihop ad hoc wireless networks is a well known and often reported phenomenon. This problem originates in part from the nature of the shared wireless medium, from link ARQ and from the interplay between 802.11 MAC and TCP. Several remedies have been proposed, some trying to fix the MAC directly; others(More)
— Wireless mesh networks are the next step in the evolution of wireless architecture, delivering wireless services for a large variety of applications in personal, local , campus, and metropolitan areas. Unlike WLANs, Mesh networks are self-configuring systems where each Access Point (AP) can relay messages on behalf of others, thus increasing the range and(More)
The X protein (HBx) of hepatitis B virus (HBV) is involved in the development of hepatocellular carcinoma (HCC), and methionine adenosyltransferase 2A (MAT2A) promotes the growth of liver cancer cells through altering S-adenosylmethionine homeostasis. Thus, we speculated that a link between HBx and MAT2A may contribute to HCC development. In this study, the(More)
Popular ad hoc routing protocols such as DSDV and AODV use " predecessor " based forwarding, namely, the packet is forwarded to the predecessor that advertised the shortest path to destination during the last update. However, if the predecessor moves, the routing table entry becomes invalid and predecessor based forwarding fails! To overcome the stale(More)
Human sulfatase-1 (hSulf-1) has been shown to desulfate cellular heparin sulfate proteoglycans and modulate several growth factors and cytokines. However, hSulf-1 has not been previously shown to mediate the signal transducer and activator of transcription 3 (stat3) signaling pathway, which is known to regulate cell proliferation, motility and apoptosis.(More)