Jeongjoon Lee

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Minimizing energy consumption is crucial for portable wireless stations because they operate on a limited battery supply. For example, the IEEE 802.11 standard includes a mechanism called power-saving mode (PSM), which allows a network interface on a mobile station to enter a sleep state whenever possible to reduce its energy consumption. We consider a(More)
Liu, Xin. Ph.D., Purdue University, December, 2002. Opportunistic Scheduling in Wireless Communication Networks. Major Professors: Edwin K. P. Chong and Ness B. Shroff. Wireless spectrum efficiency is becoming increasingly important with the growing demand for wideband wireless services. In this dissertation, we present a unified framework for opportunistic(More)
Acylase (AC) was immobilized and stabilized on carboxylated polyaniline nanofibers (cPANFs) for the development of antifouling nanobiocatalysts with high enzyme loading and stability. AC was immobilized via three different approaches: covalent attachment (CA), enzyme coating (EC), and magnetically separable enzyme precipitate coating (Mag-EPC). The enzyme(More)
The duty cycle of a wireless sensor node is a key factor that determines the life time of a wireless sensor network. In general, sensor medium access control protocols reduce the duty cycle to achieve longer lifetime. However, we found out that their performance improvements substantially decrease under extremely low duty cycles (<0.1%). Our proposed W-MAC(More)
Minimizing energy consumption is crucial for portable wireless communication systems because they operate on a limited battery supply. For example, the IEEE 802.11 standard includes a mechanism called power-saving mode (PSM), which allows a network interface on a mobile station to enter a sleep state whenever possible to reduce its energy consumption.(More)
Koo, Gar Man Simon Paul. Ph.D., Purdue University, August, 2005. Bulk Content Distribution Using Peer-to-Peer Overlay: Design and Analysis. Major Professors: C. S. George Lee and Karthik Kannan. The research focus on Peer-to-Peer (P2P) networks had been on low-complexity content mapping and efficient search mechanisms, and many of the existing P2P(More)
The duty cycle of wireless nodes is a key factor that determines the life time of wireless sensor networks. In general, sensor medium access control (MAC) protocols reduce duty cycle to achieve longer life time. However, we can find that their performances substantially decrease under extremely low duty cycle (<0.1%). Our proposed U-MAC (Ultra low duty(More)