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135 巻, 12 号
選択された号の論文の15件中1～15を表示しています
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特集：スマートな社会を支える最新計測技術
特集論文
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布施 匡章, 野田 華子, 木村 幸泰, 河村 尚志, 大谷 昭仁2015 年 135 巻 12 号 p. 729-735
発行日: 2015/12/01
公開日: 2015/12/01
ジャーナル フリーRecently, Millimeter-wave band is becoming more important in next-generation wireless application, such as automotive radar, IEEE802.11ad, mobile backhaul (5G wireless system). This report shows the advantage of preselected millimeter-wave spectrum analyzer through the measurement results. Moreover, we measured a 120 GHz QPSK modulation wave to demonstrate the effectiveness of this system with pre-selector.抄録全体を表示PDF形式でダウンロード (1350K) -
河村 尚志, 大谷 昭仁2015 年 135 巻 12 号 p. 736-742
発行日: 2015/12/01
公開日: 2015/12/01
ジャーナル フリーFor the realization of the smart community, the IoT and sensor technology in the millimeter-wave band is necessary. The development of these technologies requires accurate spectrum analysis in the frequency domain over 100 GHz. A tunable pre-selection filter is a key device in building such a spectrum analyzer. In this paper, we propose use of a ridge waveguide to achieve frequency tuning over a wider bandwidth. In addition, we demonstrate an example design and prototype for a filter with a relative bandwidth of 38 % (75 GHz to 110 GHz) and 32 % (78.1 GHz to 107.5 GHz) respectively.抄録全体を表示PDF形式でダウンロード (2036K) -
木村 幸泰, 新井 茂雄, 大谷 昭仁2015 年 135 巻 12 号 p. 743-748
発行日: 2015/12/01
公開日: 2015/12/01
ジャーナル フリーThis report is regarding to a new measurement method of a millimeter-wave using optical power. A calorie meter conventionally has been used to measure the millimeter-wave power above 100 GHz, which has high temperature dependence, and therefore finds the difficulty of small power measurement. To overcome this difficulty, we propose the new method to estimate millimeter-wave power by measuring optical power of optical 2-tone signals. This proposed method has low temperature dependence due to optical power, and therefore makes the small power of the above millimeter-wave enable. The principle and the estimation methods of this new method, and its experimental methods and results are explained. Noble results show that the difference between estimated and experiment value is maximally 0.99 dB at 110 GHz, the measurement possibility of frequency extending more than 170 GHz is referred to.抄録全体を表示PDF形式でダウンロード (1132K) -
松村 太陽, 上平 一柄, 伊藤 克麿, 小野 隆2015 年 135 巻 12 号 p. 749-755
発行日: 2015/12/01
公開日: 2015/12/01
ジャーナル フリーSolitary death by the aging society in Japan has become a serious problem. Therefore, the construction of protection system which single people can live safely is required. This study, using multiple sensors so that watch the live action of the single person, it is judged abnormal conditions such as poor physical and fall accident, is intended to construct a system that notifies the relatives or third parties. In this paper, we propose a method for detecting an abnormality in a short time by using the Local Outlier Factor which is density-based outlier detection.抄録全体を表示PDF形式でダウンロード (1736K) -
Tatsuya Yamaguchi, Yukitaka Shinoda2015 年 135 巻 12 号 p. 756-761
発行日: 2015/12/01
公開日: 2015/12/01
ジャーナル フリーThe objective of this research is to construct a structural health monitoring system that can determine the soundness of a structure. We have constructed a system that measures the reflection wavelength of fiber Bragg gratings (FBG) with a wavelength-swept light source that has a variable sweeping frequency. This paper describes the development of a flexible system in which the temporal resolution of measurement can be set arbitrarily down to 0.2 ms and demonstrates that the system is capable of measuring the reflection wavelengths of multiple FBG at high speed over long periods of time.抄録全体を表示PDF形式でダウンロード (1075K) -
坂東 靜, 野澤 昭雄, 松谷 康之2015 年 135 巻 12 号 p. 762-767
発行日: 2015/12/01
公開日: 2015/12/01
ジャーナル フリーThe objective of this study is to objectively evaluate the subjective complexity by change in oxygenated hemoglobin and hemodynamics for the developing the relief method of stress based on improving preference by subjective complexity. The change in oxygenated hemoglobin concentration (ΔoxyHb) and hemodynamic parameters as physiological indices and psychological intensity as psychological indices were measured when performing the four auditory stimuli repeatedly. As a result, comfort and subjective complexity indicated the inverted “U” shape function. The tendency of the correlation between ΔoxyHb and subjective complexity was categorized into three main types. Significant differences of stress coping were found by hemodynamics. It was clarified that physiological responses to subjective complexity were assessable objectively.抄録全体を表示PDF形式でダウンロード (1233K)
論文
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松畑 洋文, 山口 博隆, 関口 隆史, 陳 斌, 佐々木 雅之, 大野 俊之, 鈴木 拓馬, 畠山 哲夫, 辻 崇, 米澤 喜幸, 荒井 ...2015 年 135 巻 12 号 p. 768-779
発行日: 2015/12/01
公開日: 2015/12/01
ジャーナル フリーCurrent 4H-SiC wafers contain certain amount of dislocations, stacking faults and other lattice-defects. These defect structures evolve during various processes for power device fabrication. It is very important to examine evolutions of dislocation structures during power device processes, as well as the effect of dislocations on performances of fabricated power devices. Since lattice defects can be observed at only subsurface regions selectively by Berg-Barrett X-ray topography, we have applied this useful observation technique to 4H-SiC technology to solve various technological issues. Appearances of scratch-like surface morphology after epi-film growth on very flat substrate surface by CMP were examined by this technique, and the mechanism was discussed. Analysis of dislocation structure evolutions during epi-film growth, also basal-plane dislocation glide by recombination of electrons and holes were discussed. Effects of threading screw dislocations on reliability of MOS structures, and on current leakage in pn-junction under reversed bias condition were investigated and discussed. Various important suggestions for 4H-SiC industries were obtained.抄録全体を表示PDF形式でダウンロード (3248K) -
藤村 浩志, 屋鋪 裕義, 児嶋 浩, 中山 大成2015 年 135 巻 12 号 p. 780-785
発行日: 2015/12/01
公開日: 2015/12/01
ジャーナル フリーLess deterioration in magnetic properties of laminated cores, produced in the manufacturing process by automatic interlocking die, is important in order to reduce energy loss in motors. This report evaluates the influences of interlocking shape on magnetic properties of laminated ring cores. Core losses increases because of the deformation around the interlocking protuberances. In the case of annealing for removing stress distortion, the eddy current losses of the core, having circular-flat shaped interlocking, remarkably increase due to the electrically short-circuit between sheets in the interlocking parts. Numerical calculations by considering the short-circuit were performed using finite element method of the electromagnetic field analysis in order to evaluate some interlocking shape factors and so on quantitatively. As a result, core losses could be reduced by narrowing interlocking width or locating the interlocking on a part of the low density of magnetic flux.抄録全体を表示PDF形式でダウンロード (2858K) -
福岡 克弘, 小林 正樹, 尾崎 智裕, 及川 芳朗2015 年 135 巻 12 号 p. 786-791
発行日: 2015/12/01
公開日: 2015/12/01
ジャーナル フリーThe maximum magnetic flux leakage from a crack is obtained when the magnetic flux is distributed to the longitudinal direction of the crack in the orthogonal direction. In magnetic-particle testing with a yoke method, since we usually cannot predict the direction of the crack to be detected, it is necessary to perform the testing at least two times by changing the direction of magnetization. In a rotating magnetic field type magnetizer using a three-pole coil (a three-phase alternating current), omnidirectional crack can be detected by a single testing. However, the rotating magnetic field becomes no homogeneous distribution at a position far from the center of the magnetizer, and the strong magnetic field is generated in a specific direction. In this research, the multi coil magnetizer that widely obtained uniform rotating field distribution was developed. The distribution of the rotating magnetic flux density on the steel plate was evaluated with a finite element method analysis. In addition, a prototype magnetizer was produced based on the analytical results, and the characteristic was evaluated.抄録全体を表示PDF形式でダウンロード (3105K) -
吉玉 拓, 田島 大輔, 迫田 達也, 林 則行, 湯原 将光, 宇都宮 隆2015 年 135 巻 12 号 p. 792-798
発行日: 2015/12/01
公開日: 2015/12/01
ジャーナル フリーChemical analysis was carried out before and after the constant voltage hold test that was an acceleration deterioration examination to clarify deterioration factors of electric double-layer capacitor (EDLC). The results showed that the stress test slightly caused the increase of internal resistance. It was also confirmed that the range of fluorochemicals was formed on the electrode surface for approximately 10 nm in depth using electron spectroscopy for chemical analysis (ESCA). From the chemical analysis of the electrolyte using an inductively coupling plasma emission analyzer (ICP-OES), it was confirmed that the electrolyte included silicone which is one of the ingredient elements of an electrode and that the increase in holding voltage in the stress test decreased the silicone density in the electrolyte.抄録全体を表示PDF形式でダウンロード (1622K)
研究開発レター
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白濱 弘幸, 山岡 武邦2015 年 135 巻 12 号 p. 799-800
発行日: 2015/12/01
公開日: 2015/12/01
ジャーナル フリーIn this paper, we proposed and implemented an example of teaching materials requiring responsible determination to results in numerical simulations through the cognitive conflict. The logistic map is not able to calculate the exact solution in a certain parameter region because of its instability, in spite of the low dimensional map. In this implementation, we let students in upper secondary school trace the root around a fixed point by a simple pocket calculator, step by step. Through the comparison with the static analytical root and the dynamic calculated root, students could explain the relation between a suitable root and calculating conditions. The growth of the proper attitude for calculations/simulations is also quite important from the viewpoint of the education about the scientific attitude.抄録全体を表示PDF形式でダウンロード (215K) -
中野 拓真, 片山 昇, 小越 澄雄2015 年 135 巻 12 号 p. 801-802
発行日: 2015/12/01
公開日: 2015/12/01
ジャーナル フリーIt has been shown experimentally that a degree of the oxygen deficiency of TiO2 can be estimated from the peak value of visible-light absorption spectra of TiO2 for low degrees of the oxygen deficiency. TiO2 with a low degree of the oxygen deficiency is important because it shows a photocatalytic activity under visible-light irradiation although it is difficult to measure a low degree of the oxygen deficiency.抄録全体を表示PDF形式でダウンロード (807K)
部門記事
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鈴木 浩2015 年 135 巻 12 号 p. NL12_1
発行日: 2015/12/01
公開日: 2015/12/01
ジャーナル フリーPDF形式でダウンロード (944K) -
2015 年 135 巻 12 号 p. NL12_2
発行日: 2015/12/01
公開日: 2015/12/01
ジャーナル フリーPDF形式でダウンロード (591K)
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2015 年 135 巻 12 号 p. L12_1
発行日: 2015/12/01
公開日: 2015/12/01
ジャーナル フリーPDF形式でダウンロード (82K)
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