電気学会論文誌C(電子・情報・システム部門誌)
Online ISSN : 1348-8155
Print ISSN : 0385-4221
ISSN-L : 0385-4221
132 巻 , 8 号
選択された号の論文の30件中1~30を表示しています
特集:光・量子ビームによるナノダイナミクス
巻頭言
特集解説
  • 寺西 利治
    2012 年 132 巻 8 号 p. 1251-1254
    発行日: 2012/08/01
    公開日: 2012/08/01
    ジャーナル 認証あり
    Localized surface plasmon polaritons, which are referred to simply as localized surface plasmons, are carrier oscillations in inorganic nanoparticles (NPs) that are excited by incident light waves. At the NP surface, the localized surface plasmons exhibit enhanced near-field amplitudes, which are highly localized at the NP surface and decay rapidly in the dielectric surroundings. A very important aspect of localized surface plasmons is the localization of an enhanced electromagnetic field around the NPs with very high spatial resolution (subwavelength). A precise control over the free electron density of indium tin oxide NPs enables us to tune the LSPR wavelength in the NIR regions. An electric field enhancement based on NIR surface plasmons was estimated to be 5.24-4.41. The surface plasmon coupling between highly symmetrical Au dimers was investigated in detail, and a dark plasmon coupling mode was found to be applied to the plasmon propagation without significant scattering loss.
特集論文
<電子物性・デバイス>
  • 石井 真史, Brian Towlson, 原子 進, 趙 新為, 小室 修二, Bruce Hamilton
    2012 年 132 巻 8 号 p. 1255-1260
    発行日: 2012/08/01
    公開日: 2012/08/01
    ジャーナル 認証あり
    The roles of electrons and holes in photo-excited samarium doped titanium dioxide (TiO2:Sm) thin film were investigated with electric measurement techniques. For this purpose, a structural modification using interface states in silicon oxide between TiO2:Sm and a conductive silicon substrate was used. Since the interface states make a barrier to electrons in positive DC bias VDC, selective injection of holes into TiO2:Sm can be realized in VDC>0. Photo-excited dielectric relaxation (PEDR) technique, namely frequency dispersion measurement of complex impedance under excitation light, and the selective injection revealed that the Sm excitation was induced by an electron trapping with a slow response of ∼12 Hz and following recombination with holes in host TiO2 with ∼950 Hz.
  • 早瀬 和哉, 西谷 智博, 目黒 多加志
    2012 年 132 巻 8 号 p. 1261-1264
    発行日: 2012/08/01
    公開日: 2012/08/01
    ジャーナル 認証あり
    A p-GaN semiconductor is the more suitable photocathode material than a p-GaAs semiconductor, because a p-type semiconductor with wide band gap has large vacuum level shift caused by surface band bending. We measured quantum yield degradation and quantum yield spectrum of a p-GaN photocathode with an NEA surface. The p-GaN photocathode had the process of quantum yield degradation from the extraction of photocurrent and the residual gas, it is found to be important to suppress backs-pattering due to the increase of background pressure. From the dependence of quantum yield of the p-GaN photocathode on excitation wavelength, the quantum yield spectrum rapidly increased around the band gap of GaN as expected.
<光工学>
<生体医工学・福祉工学>
特集資料
<電子物性・デバイス>
  • 龍崎 奏, 尾上 順
    2012 年 132 巻 8 号 p. 1291-1296
    発行日: 2012/08/01
    公開日: 2012/08/01
    ジャーナル 認証あり
    Change in electronic states before and after photo-irradiation at a Donor/Accepter (D/A) interface in organic solar cells consisting of Zinc-porphyrin and fullerene films has been examined using in situ impedance spectroscopy (IS), which makes it possible to non-destructively measure a built-in potential (Vbi) of both D and A films at the D/A interface. Charge accumulation of photo-generated carriers in the vicinity of the D/A interface was found to enlarge the Vbi of both D [Zn(OEP)] and A [C60] films at the interface. In addition, it was noted that the sum of Vbi upon photo-irradiation was in good agreement with the open-circuit voltage (VOC), the origin of which has still remained unsolved for organic solar cells. It was thus found that charge accumulation of photo-generated carriers in the vicinity of the D/A interface plays a key role in determining VOC.
特集研究開発レター
<電子物性・デバイス>
<光工学>
論文
<電気回路・電子回路>
<情報通信工学>
  • 佐々木 範雄, 清野 賢一, 花海 丞, 織田 健志, 安達 文幸
    2012 年 132 巻 8 号 p. 1317-1327
    発行日: 2012/08/01
    公開日: 2012/08/01
    ジャーナル 認証あり
    This paper conducted experiments to model the channel for digital transmission based on the analysis of the experimental results obtained, and revealed the characteristics of propagation loss, characteristics of delay path profile and the noise characteristics of the power line carrier system that uses power transmission lines. In terms of the characteristics of propagation loss, experimental results were subjected to multiple regression analysis and an equation to estimate propagation loss was derived with useful parameters. With the characteristics of delay path profile, additional loss of the delay path was modeled and clarified. It was indicated that delay path travel both by in-phase propagation and out-phase propagation, thus it is important to consider these two propagation characteristics when modeling. With the noise characteristics, it was indicated that they are superposition characteristics of thermal noise and impulse noise and these two characteristics were modeled based on theoretical examination and the cumulative probability distribution. Simulations using these derived models agreed well with the measurement results, indicating these models will be practical for use.
<システム・計測・制御>
<メディア情報,ユーザ・インタフェース>
  • 原 健太, 武村 紀子, 岩井 儀雄, 佐藤 宏介
    2012 年 132 巻 8 号 p. 1340-1346
    発行日: 2012/08/01
    公開日: 2012/08/01
    ジャーナル 認証あり
    Many researches and developments of table-top interface have been proposed in the last decade. In a table-top system, the difference of operations between the digital media and the physical media like a paper gives us unsatisfactory experience and disturbs a comfortable simultaneous using of them. It is required for user satisfaction that the user can operate the digital and physical media seamlessly. In this paper, we propose a table-top interface system that allows users to operate digital media intuitively by using gesture recognition. The proposed table can capture an image of the object on the table by press gesture recognition from users' nail images based on SVM, and can acquire a digital content from a digital paper reader by shake gesture of the device. The evaluation experiments show that the proposed system recognizes users' finger state with higher accuracy and the users can intuitively operate the table without awareness of the data transmission.
  • 豊田 哲也, 延原 肇
    2012 年 132 巻 8 号 p. 1347-1355
    発行日: 2012/08/01
    公開日: 2012/08/01
    ジャーナル 認証あり
    The Internet news are texts which involve from various fields, therefore, when a text data that will show a rapid increase of the number of dimensions of feature vectors of Self-Organizing Map (SOM) is added, these results cannot be reflected to learning. Furthermore, it is difficult for users to recognize the learning results because SOM can not produce any label information by each cluster. In order to solve these problems, we propose SOM with additional learning and dimensional by category mapping which is based on the category structure of Wikipedia. In this method, input vector is generated from each text and the corresponding Wikipedia categories extracted from Wikipedia articles. Input vectors are formed in the common category taking the hierarchical structure of Wikipedia category into consideration. By using the proposed method, the problem of reconfiguration of vector elements caused by dynamic changes in the text can be solved. Moreover, information loss in newly obtained index term can be prevented.
<ソフトコンピューティング・学習>
<情報処理・ソフトウェア>
  • Ji Li, Fuji Ren
    2012 年 132 巻 8 号 p. 1362-1375
    発行日: 2012/08/01
    公開日: 2012/08/01
    ジャーナル 認証あり
    Weblogs have greatly changed the communication ways of mankind. Affective analysis of blog posts is found valuable for many applications such as text-to-speech synthesis or computer-assisted recommendation. Traditional emotion recognition in text based on single-label classification can not satisfy higher requirements of affective computing. In this paper, the automatic identification of sentence emotion in weblogs is modeled as a multi-label text categorization task. Experiments are carried out on 12273 blog sentences from the Chinese emotion corpus Ren_CECps with 8-dimension emotion annotation. An ensemble algorithm RAKEL is used to recognize dominant emotions from the writer's perspective. Our emotion feature using detailed intensity representation for word emotions outperforms the other main features such as the word frequency feature and the traditional lexicon-based feature. In order to deal with relatively complex sentences, we integrate grammatical characteristics of punctuations, disjunctive connectives, modification relations and negation into features. It achieves 13.51% and 12.49% increases for Micro-averaged F1 and Macro-averaged F1 respectively compared to the traditional lexicon-based feature. Result shows that multiple-dimension emotion representation with grammatical features can efficiently classify sentence emotion in a multi-label problem.
<メタボリズム社会,環境システム>
  • 荻本 和彦, 片岡 和人, 池上 貴志, 野中 俊介, 東 仁, 福留 潔
    2012 年 132 巻 8 号 p. 1376-1383
    発行日: 2012/08/01
    公開日: 2012/08/01
    ジャーナル 認証あり
    Under the anticipated high penetration of variable renewable energy generation such as photovoltaics and higher share of nuclear generation, the issue of supply-demand balancing capability should be evaluated and fixed in a future power system. Improvement of existing balancing measures and new technologies such as demand activation and energy storage are expected to solve the issue. Under the situation, a long-range power system supply-demand analysis should have the capability to evaluate the balancing capability and balancing counter measures.
    This paper presents a new analysis methodology of activated demand model and evaluation of supply-demand balancing capability for a long-range power system demand-supply analysis model, ESPRIT. Model analysis was made to verify the new methodology of the tool including day-ahead scheduling of a heat pump water heater, an EV/PHEV and a battery.
資料
<システム・計測・制御>
  • 秋吉 達郎, 今井 純, 舩曳 繁之
    2012 年 132 巻 8 号 p. 1384-1389
    発行日: 2012/08/01
    公開日: 2012/08/01
    ジャーナル 認証あり
    A continuous-time plant with discretized continuous-time controller do not yield stability if the sampling rate is lower than some certain level. Thus far, high functioning electronic control has made use of high cost hardwares which are needed to implement discretized continuous-time controllers, while low cost hardwares generally do not have high enough sampling rate. This technical note presents results comparing performance indices with and without intersample behavior, and some answer to the question how a low specification device can control a plant effectively. We consider a machine simulating wafer handling robots at semiconductor factories, which is an electromechanical system driven by a direct drive motor. We illustrate controller design for the robot with and without intersample behavior, and simulations and experimental results by using these controllers. Taking intersample behavior into account proves to be effective to make control performance better and enables it to choose relatively long sampling period. By controller design via performance index with intersample behavior, we can cope with situation where short enough sampling period may not be employed, and freedom of controller design might be widened especially on choice of sampling period.
研究開発レター
<生体医工学・福祉工学>
 
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