In the present work, we demonstrate the feasibility to form an aligned Nb(2)O(5) nanotube layer by self-organizing anodization of Nb in a NH(4)F-glycerol electrolyte. In order to achieve a nanotubular rather than a nanoporous layer, careful optimization of the anodization electrolyte is required. We show that only in a narrow window of electrolyte parameters highly aligned nanotubes of 50 nm in...

Spatial Pyramid Matching (SPM) has been a major breakthrough in the field of object and scene recognition. Using this approach, an image is divided into 2 × 2 disjoint sub-windows for each pyramid level l. However, the disjoint arrangement of the sub-windows can be too restrictive, especially when we consider that each window may benefit from broader context. Inspired by human habit in viewing ...

A pixel classifier is driving our winning approach to neural structure segmentation in electron microscopy images. Without explicit feature computation, the label of each pixel (membrane or nonmembrane) is predicted from raw pixel values in a square window centered on it. The classifier is a special type of feed-forward neural network trained by plain gradient descent. The input layer maps each...

Processing strategies are presented for controlling junction quality as both window and absorber layer thickness are reduced in polycrystalline superstrate CdS/CdTe thin-film solar cells. High resistance In2O3 and SnO2 oxide buffer layers improve coverage of chemical bath deposited CdS and device performance with PVD CdTe, resulting in efficiencies >13.5%. A new method of CdS and Cd1-xZnxS chem...

The TRANSAT [1] satellite architecture is intended to provide efficient Internet access services over DVB-RCS satellite links. One of the key features in the TRANSAT architecture is the Satellite-Link Aware Communication Protocol (S-LACP), which operates at the link layer, and is employed over a satellite segment to decrease the residual packet error rate down to an acceptable level. In this si...

Given the wide and rapid deployment of “visitor networks” [1], how to authenticate the user and account the usage on the per-packet basis securely and yet efficiently is still a challenging problem. In this paper, we explore the tradeoff between performance and security, and propose a per-datapacket authentication and access control protocol called RBWA (Random-Bit Window-based Authentication)....

In this paper, the performance of the carrier sense multiple access with collision avoidance (CSMA/CA) protocol at MAC layer with sensing errors at physical layer is investigated. Here the sensing errors are captured by modifying the Markov chain model widely used for the CSMA/CA analysis called Bianchi’s model. We investigate the throughput as a function of carrier sensing error probabilities:...

Rate control plays a very important role in video coding. A low complexity macroblock (MB) layer rate control scheme for H.264 encoder is presented in this paper. Based on the analysis of the relationship among the quantization parameter (QP), mean absolute distortion (MAD) and the coded bits, a weighted-window model is proposed. A weighted-window based QP decision and MAD prediction model is p...

A transparent flexible graphene nano-floating gate transistor memory (NFGTM) device was developed by combining a single-layer graphene active channel with gold nanoparticle (AuNP) charge trap elements. We systematically controlled the sizes of the AuNPs, the thickness of the tunneling dielectric layer, and the graphene doping level. In particular, we propose that the conductance difference (i.e...

In previous work (‘Network coding meets TCP’) we proposed a new protocol that interfaces network coding with TCP by means of a coding layer between TCP and IP. Unlike the usual batch-based coding schemes, the protocol uses a TCPcompatible sliding window code in combination with new rules for acknowledging bytes to TCP that take into account the network coding operations in the lower layer. The ...