Chienhua Chen

Learn More
Ah.slracl In order to meet the growing requirement in bandwidth for multimedia services in an IEEE 802.11 wireless local area network, we propose four polling schemes (RR, FIFO, Priority, and Priority-ELF schemes) combined with the Point Coordination Function (PCF) to improve the utilization of the wireless channel and support certain Quality of Service(More)
Dharma P. Agrawal a, Chienhua Chen b and J. Richard Burke c a Department of Electrical and Computer Engineering and Computer Science, University of Cincinnati, Cincinnati, OH 45221-0030, USA E-mail: dpa@ececs.uc.edu b Computer Science and Engineering Department, Tatung Institute of Technology, 40 Chungshan North Road, 3rd Section, Taipei, Taiwan E-mail:(More)
A simple approach to Ag2S quantum dot (QD) modification was used to tune the field emission (FE) properties of ZnO nanowire arrays (NWAs). By a simple and facile successive ionic layer adsorption and reaction (SILAR) approach, Ag2S QDs were uniformly and densely packed on ZnO nanowires (NWs) to form ZnO-Ag2S core-shell heterojunction structures. The FE(More)
A series of ZnO-CdS-Ag2S ternary nanostructures with different amounts of Ag2S were prepared using simple and low-cost successive ionic layer adsorption and reaction (SILAR) and a chemical precipitation method. The ZnO nanowires, with a diameter of ∼ 100 nm and a length of ∼ 1 μm, were modified by coating CdS and Ag2S. CdS has a high absorption coefficient(More)
A single stage interconnection network (SSIN) consists of only one stage of switches and recirculation through processors is used to provide the desired source-destination permutations. This correspondence intruduces an analytical probability model for SSI”s using 2 x 2 switches and compares it to simulation results. Four SSM’s with different network sizes,(More)
ZnO nanorod/porous silicon nanowire (ZnO/PSiNW) hybrids with three different structures as highly sensitive NO2 gas sensors were obtained. PSiNWs were first synthesized by metal-assisted chemical etching, and then seeded in three different ways. After that ZnO nanorods were grown on the seeded surface of PSiNWs using a hydrothermal procedure. ZnO/PSiNW(More)