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- Takaaki Tagawa, Yukihiro Tadokoro, Takehisa Yairi
- ACML
- 2014

This paper proposes a new fault detection and analysis approach which can leverage incomplete prior information. Conventional data-driven approaches suffer from the problem of overfitting and result in high rates of false positives, and model-driven approaches suffer from a lack of specific information about complex systems. We overcome these problems by… (More)

- Shinya Sugiura, Akihisa Ichiki, Yukihiro Tadokoro
- IEEE Signal Processing Letters
- 2012

In this letter, the concept of multiple serially-concatenated codes is invoked in the context of stochastic resonance (SR), where the achievable performance is improved by increasing noise power. More specifically, the receiver's iterative decoding process is characterized with the aid of extrinsic information transfer (EXIT) charts, such that the SR effect… (More)

- Mathieu Lenoble, Kenji Ito, Yukihiro Tadokoro, Masaki Takanashi, Katsushi Sanda
- 2009 IEEE Vehicular Networking Conference (VNC)
- 2009

In the decentralized-TDMA (D-TDMA) protocol the terminals select a free slot based on the frame information (FI) included in each packet to be transmitted. However, the FI constitutes a large portion of the packet which seriously compromised the throughput of the D-TDMA. We are proposing a technique for increasing the throughput by reducing the length of… (More)

- Akihisa Ichiki, Yukihiro Tadokoro
- Physical review. E, Statistical, nonlinear, and…
- 2013

In the study of stochastic resonance, it is often mentioned that nonlinearity can enhance a weak signal embedded in noise. In order to give a systematic proof of the signal enhancement in nonlinear systems, we derive an optimal nonlinearity that maximizes a signal-to-noise ratio (SNR). The obtained optimal nonlinearity yields the maximum unbiased signal… (More)

- Yukihiro Tadokoro, Hiraku Okada, Takaya Yamazato, Masaaki Katayama, Akira Ogawa
- GLOBECOM
- 2001

- Yukihiro Tadokoro, Akihisa Ichiki
- 2013 IEEE International Conference on Acoustics…
- 2013

Stochastic resonance (SR) is a physical phenomenon through which system performance is enhanced by noise. Applications of SR in signal processing are expected to realize the detection of a weak signal buried in strong noise. Extraction of the effect of SR requires the design of an effective nonlinear system. Although a number of studies have investigated… (More)

- Akihisa Ichiki, Yukihiro Tadokoro, Mark I. Dykman
- Physical review. E, Statistical, nonlinear, and…
- 2012

We show that weak periodic driving can exponentially strongly change the rate of escape from a potential well of a system driven by telegraph noise. The analysis refers to an overdamped system, where escape requires that the noise amplitude θ exceed a critical value θ(c). For θ close to θ(c), the exponent of the escape rate displays a nonanalytic dependence… (More)

- Akihisa Ichiki, Yukihiro Tadokoro, Mark I. Dykman
- Physical review. E, Statistical, nonlinear, and…
- 2013

We study the stationary probability distribution of a system driven by shot noise. We find that both in the overdamped and underdamped regime, the coordinate distribution displays power-law singularities in its central part. For sufficiently low rate of noise pulses they correspond to distribution peaks. We find the positions of the peaks and the… (More)

- Satoshi Koide, Yukihiro Tadokoro, Takayoshi Yoshimura
- UrbanGIS@SIGSPATIAL
- 2015

In the present study, we propose a novel spatio-temporal index structure for network-constrained trajectories, SNT-index --- Suffix-array-based Network-constrained Trajectory Index. The proposed method fast finds trajectories that follow a given route pattern within a certain time interval. The proposed method is based on two key concepts. The first is the… (More)

Stochastic resonance (SR) enhances system responses by increasing noise. By applying SR to a receiver, a subthreshold signal not receivable by a conventional linear receiver could be received. Previously, we proposed an analysis method of the SR receiver using a comparator, and evaluated its bit error rate performance. The comparator is known as a simple… (More)