ELECTROCHEMICAL PROPERTIES OF MUIJTIWALL CARBON NANOTUBES

Article先進繊維技術科学に関する研究報告 平成11年度成果報告 6: 17-19(2000)research repor

Intelligent Wireless Sensor Nodes for Human Footstep Sound Classification for Security Application

Sensor nodes present in a wireless sensor network (WSN) for security surveillance applications should preferably be small, energy-efficient and inexpensive with on-sensor computational abilities. An appropriate data processing scheme in the sensor node can help in reducing the power dissipation of the transceiver through compression of information to be communicated. In this paper, authors have attempted a simulation-based study of human footstep sound classification in natural surroundings using simple time-domain features. We used a spiking neural network (SNN), a computationally low weight classifier, derived from an artificial neural network (ANN), for classification. A classification accuracy greater than 85% is achieved using an SNN, degradation of ~5% as compared to ANN. The SNN scheme, along with the required feature extraction scheme, can be amenable to low power sub-threshold analog implementation. Results show that all analog implementation of the proposed SNN scheme can achieve significant power savings over the digital implementation of the same computing scheme and also over other conventional digital architectures using frequency-domain feature extraction and ANN-based classification.Comment: 12 pages, Journa

カーボンナノチューブによるエネルギー貯蔵･変換

Article先進繊維技術科学に関する研究成果報告書 8: 4-4(2002)research repor

Diaspora Groups and the Duration of Civil War

Previous studies examining civil war have been limited in overlooking transnational factors. One of these factors are diaspora, groups who despite migrating from their homeland, stay oriented to it, and often involve themselves when conflict occurs. With international migrant stocks estimated at 3.6% of the world’s population they embody a potent force, representing a significant and puzzling omission in the analysis of the determinants of civil war. In this thesis, identifying three mechanisms of mobilized diaspora involvement, I argue that diaspora group involvement leads to longer duration homeland conflicts. I test these hypotheses in a quantitative study, using new data and novel diaspora mobilization variables. Using a Cox (1972) proportional hazards model I find evidence that all three mechanisms of diaspora involvement in their homeland increases the likelihood of longer duration civil wars, following the expectations of my hypotheses

Genetic Algorithm and Simulated Annealing based Approaches to Categorical Data Clustering

Abstract—Recently, categorical data clustering has been gaining significant attention from researchers, because most of the real life data sets are categorical in nature. In contrast to numerical domain, no natural ordering can be found among the elements of a categorical domain. Hence no inherent distance measure, like the Euclidean distance, would work to compute the distance between two categorical objects. In this article, genetic algorithm and simulated annealing based categorical data clustering algorithms have been proposed. The performances of the proposed algorithms have been compared with that of different well known categorical data clustering algorithms and demonstrated for a variety of artificial and real life categorical data sets. Keywords: Genetic Algorith

Controlled Growth of Polyaniline Fractals on HOPG through Potentiodynamic Electropolymerization

Polyaniline (PANI) in fractal dimension has been electrodeposited reproducibly on highly oriented pyrolytic graphite (HOPG) from 0.2 M aniline in 1 M aqueous HCl solution by potentiodynamic sweeping in the range of −0.2 to 0.76 V vs Ag/AgCl at room temperature. Fractal growth of PANI dendrimers is affected by diffusion limited polymerization (DLP) at a sweep rate of 15 mV s^–1 for 43 min. This type of PANI dendrimer is prepared for the first time on such large area HOPG substrate by electrochemical technique using rather simple cell setup. The fractal dimension has been determined by chronoamperometry (CA) and box counting technique and is found to vary from 1.4 to 1.9 with the duration of electropolymerization. The sweep rate, terminal oxidation potential, and the diverse surface anisotropy of the HOPG surface are found to be crucial factors in controlling the growth of such PANI fractals

Electrocatalysts for Fuel Cells and Hydrogen Evolution - Theory to Design

The book starts with a theoretical understanding of electrocatalysis in the framework of density functional theory followed by a vivid review of oxygen reduction reactions. A special emphasis has been placed on electrocatalysts for a proton-exchange membrane-based fuel cell where graphene with noble metal dispersion plays a significant role in electron transfer at thermodynamically favourable conditions. The latter part of the book deals with two 2D materials with high economic viability and process ability and MoS2 and WS2 for their prospects in water-splitting from renewable energy