On‐line detection of persistently high packet‐rate flows via a sliding window scheme with random packet sampling

We consider on‐line detection of persistently high packet‐rate flows. We assume that flow information is collected via a time‐based sliding window scheme with random packet sampling. In this framework, we propose a method of determining the threshold of the number of sampled packets, which guarantees the false negative ratio. We also formulate and solve the design problem of our scheme, where we aim to minimize the false positive ratio. We then conduct sampling experiments with public trace data and confirm that our method works well as designed. Copyright © 2013 John Wiley & Sons, Ltd.     

Pudding-Mold-Type Band as an Origin of the Large Seebeck Coefficient Coexisting with Metallic Conductivity in Carrier-Doped FeAs2 and PtSe2

We theoretically study the thermoelectric properties of electron-doped FeAs₂ and hole-doped PtSe₂ from a band-structure point of view using first-principles band calculations. The band structure of both materials has a peculiar band shape with a flat portion at the top (bottom) of the band, namely the pudding-mold-type band as found in Na _x CoO₂. The pudding-mold-type band has a quasi-one-dimensional nature in FeAs₂ and a quasi-two-dimensional nature in PtSe₂. We study the origins of the pudding-mold-type band and find that the \( d_{z^2} \) orbital in FeAs₂, and not only the p _z but also the p _x and the p _y orbitals in PtSe₂ play an important role in making the pudding-mold-type band. We calculate the Seebeck coefficients by the Boltzmann equation approach using a tight-binding model constructed from first-principles band calculations, finding values close to experimental observations. The present study shows the general efficiency of the pudding-mold-type band. We suggest that an efficient route towards obtaining good thermoelectric materials is to realize ideal pudding-mold-type bands by modification of lattice structures.     

Non-parametric classifier-independent feature selection

Feature selection is used for finding a feature subset that has the most discriminative information from the original feature set. In practice, since we do not know the classifier to be used after feature selection, it is desirable to find a feature subset that is universally effective for any classifier. Such a trial is called classifier-independent feature selection. In this study, we propose a novel classifier-independent feature selection method on the basis of the estimation of Bayes discrimination boundary. The experimental results on 12 real-world datasets showed the fundamental effectiveness of the proposed method.     

Telomerase and proliferative activity in placenta from women with and without fetal growth restriction

-Natriuretic peptides suppress adrenergic neurotransmission by a mechanism sensitive to pertussis toxin, suggesting that GTP-binding proteins are involved in the response. The major GTP-binding proteins present in the pheochromocytoma (PC12) cells used in this report are Goalpha and Gialpha2. We tested the hypothesis that the more abundant GTP-binding protein, Goalpha, mediates natriuretic peptide effects in PC12 cells by selectively ablating Goalpha from the cells with antisense oligodeoxynucleotides. The results indicate that a selective ablation of Goalpha with this technique eliminated C-type natriuretic peptide (CNP) effects and suppressed dopamine efflux evoked by a depolarizing stimulus. However, the activation of guanylyl cyclase (GC) by CNP was sustained after the Goalpha ablation. Further, Nomega-nitro-L-arginine methyl ester suppressed evoked dopamine efflux equally in the presence and absence of Goalpha. These results suggest that CNP attenuates evoked catecholamine efflux from PC12 cells by a mechanism requiring Goalpha but independent of GC activation.     

Design and Development of Highly Efficient Rectangular Column Structured Titanium Oxide Photocatalysts Anchored onto Silica Sheets

The purpose of this study is to design and develop highly efficient photocatalysts that can be anchored onto a substrate, and to this end we have prepared a titanium oxide photocatalyst using a wet process or a dry process. The results of this study led to the successful development of highly efficient rectangular column structured titanium oxide photocatalysts which could be anchored onto silica sheets.     

PD time‐sequential properties of SF6 and SF6 gas mixture including CO2

This paper deals with partial discharge (PD) time‐sequential properties of SF₆/N₂/CO₂ ternary gas mixture as well as SF₆ and SF₆/N₂ gas mixture under AC and positive DC voltage applications. The measurements were carried out by changing the gas pressure up to 0.6 MPa and applied voltage with the N‐shape characteristics of breakdown voltage versus gas pressure for each tested gas considered. We obtained experimental results of the gas pressure dependence of maximum peak value of PD current pulse as well as the relationship between the time interval of PD pulses and the peak value of PD pulse. We discuss the mechanism of increase in breakdown voltage by adding CO₂ into SF₆/N₂ gas mixtures in terms of change of PD type from streamer to leader discharge. © 2005 Wiley Periodicals, Inc. Electr Eng Jpn, 151(3): 32–40, 2005; Published online in Wiley InterScience ( www.interscience.wiley.com ). DOI 10.1002/eej.20073     

A 5-6.4-Gb/s 12-channel transceiver with pre-emphasis and equalization

A 5-6.4 Gb/s transceiver, consisting of a parallel 12-channel transmitter (Tx), 12-channel receiver (Rx), clock generators based on LC-VCO phase-locked loops (PLLs), and a clock recovery unit, was developed. The Tx has a five-tap pre-emphasis filter, and the Rx has an equalizer with an intersymbol interference (ISI) monitor. Monitoring the ISI enables fine adjustment of loss compensation. The pre-emphasis filter in the Tx and the equalizer in the Rx compensate for transmission losses of up to 20 dB at 6.4 Gb/s, respectively. Both the Tx and Rx channels, including the PLLs, are 3.92 mm/sup 2/ in area. The transmitter dissipates 150 mW/channel at 6.4 Gb/s when compensating for a loss of 20 dB, and the receiver 90 mW/channel when compensating for the same loss.