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Transformers in outdoor substations often need to comply with strict noise regulation standards in urban areas. In this paper the authors propose a practical method for determining the acoustic noise levels of transformers to be reduced in an urban outdoor substation. The proposed algorithm is based on a pseudo-inverse calculation using an empirical formula for noise levels at the boundary points...
Recently, environment monitoring system attracts attention because global and/or local disasters such as global warming problem, air pollution, heavy rain and flood etc. occur everywhere. In addition, some people and companies have a weather sensor and broad band internet service become widespread as weather sensor and internet service cost lower. Many of these existing sensor network are operated...
We propose an online anomal movement detection method using incremental unsupervised learning. As the feature for discrimination, we extract the principal component of the spatio-temporal feature by incremental PCA. We then detect anomal movements by an incremental 1-class SVM. In order to use principal component as the feature for discrimination while supporting incrementation of the subspace, we...
The k-nearest neighbor(k-NN) is improved by applying rough set and distance functions with relearning and ensemble computations to classify data with the higher accuracy values. Then, the proposed relearning and combining ensemble computations are an effective technique for improving accuracy. We develop a new approach to combine kNN classifier based on rough set and distance functions with relearning...
We have shown that a capacity of the transpacific system designed to support 8 times 2.5 Gbit/s can be increased to a factor of eight by using 16 times 10 Gbit/s RZ-DPSK in transmission experiments using a deployed submarine cable.
This paper proposes a simple and practical method for determining the optimal acoustic noise levels of transformers to be replaced in an aged substation. The proposed algorithm is based on a reverse calculation method and Linear Programming using an empirical formula for estimating noise levels at the boundary points around the substation premises. Necessary input parameters are three dimensions of...
In the paper, we have shown that averaging the radiation patterns over several distances between two antennas is useful in order to reduce the influence of reflection waves, using simulation software FEKO. In the conditions with and without reflection waves we simulate the radiation patterns of the biconical antenna (the operation band is from 30 MHz to 300 MHz) in distance between antennas from 315...
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