著者
Marie KATSURAI Takahiro OGAWA Miki HASEYAMA
出版者
一般社団法人 電子情報通信学会
雑誌
IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences (ISSN:09168508)
巻号頁・発行日
vol.E95.A, no.5, pp.927-937, 2012-05-01 (Released:2012-05-01)
参考文献数
37
被引用文献数
1

In this paper, a novel framework for extracting visual feature-based keyword relationships from an image database is proposed. From the characteristic that a set of relevant keywords tends to have common visual features, the keyword relationships in a target image database are extracted by using the following two steps. First, the relationship between each keyword and its corresponding visual features is modeled by using a classifier. This step enables detection of visual features related to each keyword. In the second step, the keyword relationships are extracted from the obtained results. Specifically, in order to measure the relevance between two keywords, the proposed method removes visual features related to one keyword from training images and monitors the performance of the classifier obtained for the other keyword. This measurement is the biggest difference from other conventional methods that focus on only keyword co-occurrences or visual similarities. Results of experiments conducted using an image database showed the effectiveness of the proposed method.
著者
Keun-Chang Kwak
出版者
一般社団法人 電子情報通信学会
雑誌
IEICE Electronics Express (ISSN:13492543)
巻号頁・発行日
vol.6, no.4, pp.187-192, 2009 (Released:2009-02-25)
参考文献数
6

This paper is concerned with real-time incremental face recognition for home service robots. For this purpose, we use an Incremental Tensor Subspace Analysis (ITSA) to enroll and recognize the user's face through low-price robot camera when robot performs the real-time customized service in home environments. Furthermore, we perform face recognition based on face database constructed in u-robot test bed environments in ETRI (Electronics and Telecommunications Research Institute). Thus it can be used as a core technique in conjunction with Human-Robot Interaction (HRI) that can naturally interact between human and robots in home robot applications. The experimental results on face database reveal that the presented method shows a good performance in comparison with the well-known methods in distant-varying environments.
著者
Shin-ichi Todoroki
出版者
一般社団法人 電子情報通信学会
雑誌
IEICE Electronics Express (ISSN:13492543)
巻号頁・発行日
vol.8, no.23, pp.1978-1982, 2011 (Released:2011-12-10)
参考文献数
11
被引用文献数
1 2

The propagation threshold power through a white tight-buffered single-mode optical fiber was found to be 3% less than that through a transparent acrylate-coated fiber. This is because the white pigments in the buffer layer backscatter the visible emission that pumps a fiber fuse. Namely, the backscattered light is absorbed by the thermal decomposition product SiO in the glass melt surrounding the traveling plasma. This self-pumping effect was revealed by comparing the void trains left in fiber segments coated with white or black oil paint. This threshold reduction compels us to re-examine the power tolerance design of optical networks and fiber fuse terminators.
著者
M. Pirai H. R. Hassani
出版者
一般社団法人 電子情報通信学会
雑誌
IEICE Electronics Express (ISSN:13492543)
巻号頁・発行日
vol.6, no.21, pp.1528-1534, 2009 (Released:2009-11-10)
参考文献数
8
被引用文献数
2 5

In this paper a reduced size microstrip log periodic dipole antenna with top loading of elements is presented. In many situations, the lateral size of the LPDA antenna has to be reduced to fit the antenna into the installation space. In this work, top loaded element structure is adopted to reduce the size of the dipole elements. Each straight dipole element of the LPDA antenna is turned into a T-shaped element whose total length is equal to that of the original straight dipole element length, resulting in a dipole length that is half that of the original dipole element, i.e. lateral size of the LPDA has been reduced by more than half. This procedure can be repeated to reduce the dipole element length even further, by placing a double T-shaped element on top of each other, resulting in an overall length that is almost 46% of the original dipole element length. Comparison of the reduced sized LPDA with that of the original LPDA shows that the VSWR (≤ 2.0) results of the reduced size LPDA are lower than those of the straight elements over the 2.3-8GHz frequency band. For the three LPDA structures results of peak gain shows that on average over the frequency band, 2-8GHz, gain varies between 5-6dBi. Simulation and measured results on VSWR, radiation pattern and gain at the various frequencies are provided.
著者
大賀 寿郎
出版者
一般社団法人 電子情報通信学会
雑誌
電子情報通信学会 基礎・境界ソサイエティ Fundamentals Review (ISSN:18820875)
巻号頁・発行日
vol.1, no.4, pp.4_46-4_61, 2008-04-01 (Released:2011-03-01)
参考文献数
30
被引用文献数
2 2

圧電材料を用いたマイクロホン,スピーカなどの音響部品は構造が簡単なことを特徴とし,長い歴史をもっており,最近の技術の進展にも見るべきものがある.しかし,この種の部品のまとまった技術解説が意外に少ない.ここでは基本的な事項の説明と実用部品の技術の概観を目的として,やや長く詳しい解説を行う.対象としてセラミック圧電材料と高分子圧電材料とを取り上げ,材料の性質,基本的な設計法から最新の研究成果までを述べる.
著者
Babak Mohammadian Abdolreza Nabavi
出版者
一般社団法人 電子情報通信学会
雑誌
IEICE Electronics Express (ISSN:13492543)
巻号頁・発行日
vol.7, no.19, pp.1453-1460, 2010 (Released:2010-10-10)
参考文献数
9
被引用文献数
1 1

A new wideband Orthogonal Frequency Division Multiplexing (OFDM) receiver based on split spectrum processing (SSP) technique is presented. In this receiver, the spectrum of the input signal is first decomposed into a number of sub-bands, and then independently down-converted to baseband for filtering and demodulation. This technique, which is characterized by the number of sub-bands and their bandwidths, reduces the sampling rate of analog-to-digital converter (ADC) by the sub-band bandwidth compared to conventional OFDM system. Analysis and simulation of the phase noise show that the new receiver exhibits the same bit error rate (BER) performance as the conventional OFDM system. Also, the Chebyshev II filter gives rise to superior BER performance compared to Butterworth, Chebyshev I, Elliptic, and Bessel filters. Interestingly, the traditional time domain synchronization algorithms can be employed for the new SSP receiver with only minor modifications.