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
137 巻 , 7 号
選択された号の論文の25件中1~25を表示しています
特集:平成28年電子・情報・システム部門大会
特集論文
<情報通信工学>
  • Ryosuke Kawami, Akira Hirabayashi, Nobuyuki Tanaka, Takashi Ijiri, Shi ...
    2017 年 137 巻 7 号 p. 864-870
    発行日: 2017/07/01
    公開日: 2017/07/01
    ジャーナル 認証あり

    This paper proposes a compressive sensing method for the phased array weather radar (PAWR), which is capable of three-dimensional observation with high spatial resolution in 30 seconds. Because of the large amount of observation data, which is approximately 1 gigabyte per minute, data compression is an essential technology to operate PAWR in the real world. Even though many conventional studies applied compressive sensing (CS) to weather radar measurements, their reconstruction quality should be further improved. To this end, we define a new cost function that expresses prior knowledge about weather radar measurements, i.e., local similarities. Since the cost function is convex, we can derive an efficient algorithm based on the so-called convex optimization techniques, in particular simultaneous direction method of multipliers (SDMM). Simulation results show that the proposed method outperforms the conventional methods for real observation data with improvement of 4% in the normalized error.

<生体医工学・福祉工学>
<システム・計測・制御>
  • 丸山 喜久, 永田 茂
    2017 年 137 巻 7 号 p. 877-883
    発行日: 2017/07/01
    公開日: 2017/07/01
    ジャーナル 認証あり

    This study aims to develop a numerical model to evaluate the road roughness condition using acceleration time histories recorded by car navigation systems. The acceleration record of transverse component of the vehicle is employed to detect the road sections with the international roughness index (IRI) of 12 mm/m or above. To achieve the objective, the IRI was measured with the interval of 10 m in Yokohama City and Chofu City. The relationship between the IRI and the accelerations recorded by car navigation system was evaluated, and logistic regression analyses were performed. The discrimination ability of the numerical model was revealed, and the model was applied to the acceleration time histories accumulated in March, 2015.

  • 松井 義弘, 綾野 秀樹, 増田 士朗, 中野 和司
    2017 年 137 巻 7 号 p. 884-890
    発行日: 2017/07/01
    公開日: 2017/07/01
    ジャーナル 認証あり

    In this paper, a realizing method of a prefilter to cancel the effect of input/output data of plants on controller tuning with Virtual Reference Feedback Tuning (VRFT) is proposed. VRFT tunes controllers based on model matching. The reference model of the model matching for VRFT is a desired complementary sensitivity function. The corresponding transfer function to the reference model consists of the plant and the controller to be tuned. The controller is tuned so that the squared 2-norm of the error between the impulse responses of these transfer functions is minimized. To obtain the impulse response of the latter transfer function, the impulse response of the plant is necessary. An inverse filter, which is a finite impulse response filter and is contained in the prefilter, is employed to reproduce the plant impulse response from the data. Therefore, the ideal model matching error not affected by the data can be obtained. The usefulness of the method is shown through numerical examples.

  • 津久井 文哉, 増田 士朗
    2017 年 137 巻 7 号 p. 891-897
    発行日: 2017/07/01
    公開日: 2017/07/01
    ジャーナル 認証あり

    This paper proposes a data-driven control parameter tuning based on fictitious reference iterative tuning (FRIT) for a class of continuous-time nonlinear systems with unknown parameters. This paper considers a single input, single output, continuous time, nonlinear affine system with linear input term. The controlled system can be stabilized by way of feedback linearization, but it is supposed to have unknown parameters. Hence, the controller based on feedback linearization has unknown parameters to be estimated. The present work introduces the idea of FRIT approach in order to tune controller parameters directly from closed-loop input and output data. In the proposed method, the controller parameters are tuned directly from collected closed-loop input and output data, and are obtained by optimizing the cost criterion composed of a fictitious reference signal. The paper also examines the well-posedness of the proposed nonlinear feedback controller. Finally, a numerical example is shown to demonstrate the effectiveness of the proposed method.

<メディア情報,ユーザ・インタフェース>
  • 高橋 陽香, 坂東 靜, 大岩 孝輔, 野澤 昭雄, 石川 智治, 三井 実
    2017 年 137 巻 7 号 p. 898-903
    発行日: 2017/07/01
    公開日: 2017/07/01
    ジャーナル 認証あり

    Extra-high-quality audio devices, which is reproducible sound of broadband, have appeared in recent years. Such audio devices of broadband can feel like a deeper sense of realism as an air field by feeling the vibration of the air with entire body. This technology is expected application as sense of presentation technology. Using this technology, development of the new stimulus medium that is the field generating device, such as wrapped up in air is enabled. The purpose of this study is to create a completely new sense with the airflow stimulus termed “air-sensation” by using the air field. In this study, we measured the psychophysical quantities to clarify the cognitive characterization of air-sensation as a basic examination. Specifically, we measured the absolute thresholds to detect the air-flow stimulus and sensitivity characteristics with respect to the strength of the stimulus. Consequently, it was revealed that cognitive characterizations vary with the properties of signal waveform, stimulus-presentation site, and stimulus-presentation order.

特集資料
<メタボリズム社会,環境システム>
特集研究開発レター
<生体医工学・福祉工学>
<システム・計測・制御>
  • 松井 智哉, 由井 四海, 水本 巌
    2017 年 137 巻 7 号 p. 912-913
    発行日: 2017/07/01
    公開日: 2017/07/01
    ジャーナル 認証あり

    Measurement system using conventional optical devices using a laser of 1520nm and its second harmonic generated (SHG) beam of 760nm for simultaneous measurement of oxygen and acetylene is described. A SHG light of 760nm with an output power of 1.8mW is generated by the PPLN module and combined with a DFB laser. A single spectrum which two absorption spectra of each gas are superimposed with each other is measured in a single wavelength scan. Signal intensity of the 2nd derivative absorption spectrum varies with the wavelength modulation width and a high signal intensity of the absorption was observed with modulation width of 7.4GHz when two gases are measured simultaneously.

  • Qiuhao Fu, Kazushige Koiwai, Toru Yamamoto
    2017 年 137 巻 7 号 p. 914-915
    発行日: 2017/07/01
    公開日: 2017/07/01
    ジャーナル 認証あり

    Recently, the data-oriented control method that directly designs the control parameters from the closed-loop data has been attracting attention. However, the structure of the controller should be determined previously in order to design a controller. Therefore, it is difficult to get the desired control performances for some complicated systems. In this paper, a new controller design method that designs both the controller structure and the control parameters simultaneously is proposed. The controller structure is determined by a genetic algorithm, and the control parameters are computed by using the least squares method. Furthermore, an experimental example is examined in order to verify the effectiveness of the proposed control scheme.

<音声画像処理・認識>
論文
<電子物性・デバイス>
<電気回路・電子回路>
  • 八本 大希, 庄野 和宏
    2017 年 137 巻 7 号 p. 927-933
    発行日: 2017/07/01
    公開日: 2017/07/01
    ジャーナル 認証あり

    In this paper, a new method for synthesizing a higher-order passive complex filter using autotransformers is proposed. The proposed filter can be synthesized approximately by transforming the conventional one. Since the proposed transformation replaces all transformers with autotransformers, the proposed filter has no floating windings. As examples, both first-order and third-order complex filters are synthesized. The validity of the proposed method was confirmed through computer simulation and experiment. Due to approximate synthesis, the transfer function of the real output is different from that of the imaginary output. However, both of them have roughly the same response near the passband. Experimental results show good agreement with the theoretical value. It means that the proposed method is valid for the practical application.

<生体医工学・福祉工学>
  • 岡島 恵子, 佐久間 俊, 山口 梢, 水野(松本) 由子
    2017 年 137 巻 7 号 p. 934-940
    発行日: 2017/07/01
    公開日: 2017/07/01
    ジャーナル 認証あり

    The objectives of this study were to quantify changes in autonomic nervous function in shift workers after work using a finger plethysmogram and to evaluate their psychological states by means of psychological questionnaire. Eight female participated in the study. After a day shift (AD), after a night shift (AN), and on a holiday (OH) (referred to as “conditions”), the subjects' plethysmogram was continuously recorded while they performed tasks that would induce mental workload. Also, psychological questionnaire were conducted. The subjects engaged in four tasks: they gazed at a cross-shaped symbol on a computer screen (cross: “CS”), then they closed their eyes and rested (baseline: “BL”), they performed a mental arithmetic task (“AC”), and finally they rested (closed eyes: “CE”). The results showed that, the pulse wave amplitude during the “AC” task was significantly lower as compared to the figures during the “CS” task after a day and a night shift. The “CE” task was significantly higher than “AC” task after a day shift. The pulse wave length during the “CE” task was significantly higher than “AC” task after a day shift and on a holiday. The results of the psychological tests showed that fatigue levels were significantly higher than vigor levels after a night shift. These results suggest that the sympathetic nervous system becomes dominant during the mental workload after a night shift and that sympathetic dominance remains unchanged even after completing tasks.

  • 佐藤 巧, 加藤 和夫, 志子田 有光, 黒木 友裕, 石川 敦雄
    2017 年 137 巻 7 号 p. 941-947
    発行日: 2017/07/01
    公開日: 2017/07/01
    ジャーナル 認証あり

    To design novel displays guiding gaze, it is important to know how the visual search affects the perception and cognitive processing of objects. The purpose of this study was to investigate the characteristics of the visual search that are controlled by spatial frequency. We measured the detection time, accuracy rate, and scan path during eye movement in response to target stimuli. The stimuli, embedded in one of 30 areas (6 horizontal × 5 vertical directions) in background image with the broad frequency range, were presented while the spatial frequency parameter β was varied; this corresponded to the slope of the luminance power spectrum in the target stimuli. Twelve healthy men (aged 21-23 years) with normal vision participated in the experiment. The results showed a visual search threshold of 0.5 of β for both subjective and objective responses, corresponding to oral responses and support vector machine (SVM) applied to the deviation of the scan path from the target stimuli, respectively. Furthermore, the objective responses observed using SVM suggest the possibility of subconscious discrimination of target stimuli even when the subjects could not discriminate the target stimuli subjectively.

<音声画像処理・認識>
  • 佐藤 真悟, 田中 秀明, 山本 正信
    2017 年 137 巻 7 号 p. 948-956
    発行日: 2017/07/01
    公開日: 2017/07/01
    ジャーナル 認証あり

    Polishing operation of metal surface of industrial product with high quality needs skillful working. This paper shows several conditions for skillful polish of wings of an aircraft. A motion capture system from multiple cameras measures movements of some workers, i.e. master, senior, junior and Novice, who have different skill for polishing the wings. Several expert workers present 9 conditions explaining a skillful polishing operation. We can find three important conditions by a multiple linear regressive analysis of the movements of polishing workers, i.e. (1) synchronized movements of both arms, (2) forearm bending with 45° to upper arm, (3) smooth movements. According to the three conditions, we can evaluate skill of worker polishing wings.

<ソフトコンピューティング・学習>
<情報システム,エレクトロニック・コマース>
  • 橋本 誠志
    2017 年 137 巻 7 号 p. 967-973
    発行日: 2017/07/01
    公開日: 2017/07/01
    ジャーナル 認証あり

    IoT is one of embedded systems and bases on distributed system including cloud computing. Devices used in IoT have characteristics including long-term application, unification between hardware and software, and purification for devices. IoT system may make us difficult to maintain securities on networks. During bankruptcy, the trustees of the concerned company face a dilemma regarding the protection of personal data managed by the bankrupt businesses between creditors and data subjects under liquidation since during liquidation, it is not clear whether such data belong to the creditors or the data subjects. Particularly in the case of this system, trustees find it difficult to obtain an overall view of the personal data managed by the bankrupt firm.

    This paper suggests a burden of responsibilities for administrators under bankruptcies in IoT stage.

  • 上辻 慶典, 柳本 豪一, 吉岡 理文
    2017 年 137 巻 7 号 p. 974-979
    発行日: 2017/07/01
    公開日: 2017/07/01
    ジャーナル 認証あり

    There are many online shops in the Internet and a lot of persons buy products in those shops. Many online shops provide advertisements and item recommendations to attract their customers, but to achieve satisfactory customer experience, shops have to change advertisement and recommendation strategies for every customer's intents, since his/her intent decides whether provided advertisements and recommendations are useful or not. Hence it is important for online shops to estimate customer's intents. One of the resources we can use to estimate is an access log, including information on customer's movement in the online shop. If the movements depend on customer's intents, we can extract knowledge on them from the access logs. However, tracking user's changeable intents is difficult for existing time-series topic models since there would be few user activities in a time slice. In this paper, we propose a new topic model combining a topic model for behavior analysis with a model for short text analysis. In experiments, we show that our new model can track user's intents appropriately.

<情報処理・ソフトウェア>
  • 志田 剛, 押野 智樹, 津田 和彦
    2017 年 137 巻 7 号 p. 980-986
    発行日: 2017/07/01
    公開日: 2017/07/01
    ジャーナル 認証あり

    It is necessary to have an agreement between the customer and the IT vendor which they understand the result and process of project delivery estimation. However the IT vendors have difficulty to explain complexity and dynamic difficulty of the project specification for the customers who do not have the IT expertise. On the other hand the customers feel unsatisfied about the present situation because they often receive unexpected project estimation from the IT vendors without clarifying the way of the estimation. It said that only 14% of customers were satisfied with the estimation and the pricing in JUAS IT trend survey, 2011. From that survey shows that there is huge gap between the customers and IT vendors about the feeling convinced and satisfied with the estimation. Therefore this study clarifies the estimation process and variation factors, and makes it visible.

  • 湯本 剛, 植月 啓次, 松尾谷 徹, 津田 和彦
    2017 年 137 巻 7 号 p. 987-994
    発行日: 2017/07/01
    公開日: 2017/07/01
    ジャーナル 認証あり

    Along with a rapid increase in the size and complexity of software today, the number of required test cases is also increasing. Although a lot of approaches to derive test cases are proposed, in case of deriving test cases for combination of state transition, N-switch coverage using state transition testing is only one approach. This approach cannot manage increasing test cases. In this paper, a practical knowledge to derive high priority procedural combination test cases in test cases from 1-switch coverage using state transition testing is formalized. Procedural combinations between tasks to be tested which is derived from data design documents are defined as rules. It is confirmed that the expected procedural combination test cases can be derived using this approach from a concrete instance of an IT system.

研究開発レター
<情報通信工学>
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