JaLCDOI 10.18926/14158
フルテキストURL Mem_Fac_Eng_39_1_93.pdf
著者 五百旗頭 健吾| 豊田 啓孝| 和田 修己| 古賀 隆治|
抄録 The optical properties of clouds were measured with a polarization Mie lidar during April, 2004 and investigated to categorize the particles detected by the lidar. The cloud layers were categorized into five types according to the depolarization ratios, as follows: (I) constant and small (less than 5%); increasing with height (II) nearly from 0% and (III) from about 50%; (IV) large and varying with the backscattering coefficient; and (V) sharply decreasing. This categorization of clouds enabled us to separate aerosols from clouds in a lidar signal. Comparison of the backscattering coefficients between clouds of types (I) and (II) suggested that the depolarization ratio induced by multiple scattering in dense clouds does not depend on the particle density. Estimation of the particle phase for the five cloud categories was also examined.
出版物タイトル Memoirs of the Faculty of Engineering, Okayama University
発行日 2005-01
39巻
1号
開始ページ 93
終了ページ 101
ISSN 0475-0071
言語 English
論文のバージョン publisher
NAID 120002308479
JaLCDOI 10.18926/46983
フルテキストURL mfe_37_2_089_097.pdf
著者 Iokibe, Kengo| Toyota, Yoshitaka| Wada, Osami| Koga, Ryuji|
抄録 Aerosol extinction coefficients of clouds and dust were continuously measured in the year of 2002 with a polarized Mie-scattering lidar controlled by an automatic and remotely operating system utilizing internet services. Measured cloud extinctions were greater than 1.0 km(-1) below the altitude 6 km, 0.17 - 1.0 km(-1) between 6 and 10 km, and 0.091 - 0.3 km(-1) beyond 10km. Extinction of dust were 0.10 and 0.20 km(-1) for Asian dust and 0.057 km(-1) for urban dust.
出版物タイトル Memoirs of the Faculty of Engineering, Okayama University
発行日 2003-03
37巻
2号
開始ページ 89
終了ページ 97
ISSN 0475-0071
言語 English
論文のバージョン publisher
NAID 120003457336
著者 Wang, Zhi Liang| Wada, Osami| Toyota, Yoshitaka| 古賀 隆治|
発行日 2003-11
出版物タイトル Environmental Electromagnetics
資料タイプ 学術雑誌論文
JaLCDOI 10.18926/47028
フルテキストURL mfe_36_2_073_082.pdf
著者 Hidayat, Iip Syarif| Toyota, Yoshitaka| Torigoe, Osamu| Wada, Osami| Koga, Ryuji|
抄録 A multi-path ring-resonator (MPRR) was proposed to extend FSR of ring resonator. However, it is complicated to analyze the MPRR by using well-known analysis techniques such as scattering matrix or other numerical methods. This paper describes procedure for deriving transfer matrix by means of signal flow-chart to analyze the MPRR. We do not need complicated calculation for steady state analysis because transfer matrix elements are formulated clearly. As a result, The calcultaion time in this method can be reduced 1/3 to 1/20 times compared with using scattering matirx method. Furthermore, a transmittance characteristics of the MPRR at FSR extension-factor of 10 will also be shown. This suggests that analysis of other types of the MPRR by using this method can be performed simply and take a shorter time.
出版物タイトル Memoirs of the Faculty of Engineering, Okayama University
発行日 2002-03
36巻
2号
開始ページ 73
終了ページ 82
ISSN 0475-0071
言語 English
論文のバージョン publisher
NAID 120003497050
著者 Wang, Zhi Liang| Wada, Osami| Toyota, Yoshitaka| 古賀 隆治|
発行日 2002-5
出版物タイトル Electromagnetic Compatibility
資料タイプ 学術雑誌論文
著者 Wang, Zhi Liang| Wada, Osami| Toyota, Yoshitaka| Koga, Ryuji|
発行日 2005-2
出版物タイトル Electromagnetic Compatibility
47巻
1号
資料タイプ 学術雑誌論文
JaLCDOI 10.18926/15360
フルテキストURL Mem_Fac_Eng_OU_34_27.pdf
著者 Wei, He| 古賀 隆治| 五百旗頭 健吾| 和田 修己| 豊田 啓孝|
抄録 In spring of 1998, Asian dust was observed with a Mie LIDAR in Okayama University, which can measure depolarization ratio. Three events of intense Asian dust were occurred in the period and medially detailed structure of atmosphere was found after examining records. Asian dust was distinguished from water droplets and the possibility to study three dimensional dynamic structure of atmosphere were demonstrated.
キーワード Mie lidar Asian dust (KOSA) depolarization ratio backscattering ratio range normalized
出版物タイトル Memoirs of the Faculty of Engineering, Okayama University
発行日 2000-03-27
34巻
1-2号
開始ページ 27
終了ページ 37
ISSN 0475-0071
言語 English
論文のバージョン publisher
NAID 120002307539
JaLCDOI 10.18926/47029
フルテキストURL mfe_36_2_083_089.pdf
著者 Watanabe, Tetsushi| Wada, Osami| Koga, Ryuji| Toyota, Yoshitaka| Miyashita, Takuya|
抄録 Suppression of common-mode current is important to achieve electromagnetic compatibility of high-speed and high-density electronic circuits. The authors have focused on the common mode current flowing on a printed circuit board (PCB) to explain the excitation mechanism. A narrow ground pattern in microstrip structure excites common-mode current. In the previous paper, the authors explained the mechanism of common mode generation by means of "current division factor" for simple PCBs. The estimated radiation from a simple PCB agreed well with measured one. In this paper, the authors extend the theory to be applied to generalize ground structure. The validity of the theory is confirmed by comparing the measured radiation and the estimated value using the common-mode model for a test PCB. The estimated radiation agrees well with the measured one within 3 dB up to 900 MHz.
出版物タイトル Memoirs of the Faculty of Engineering, Okayama University
発行日 2002-03
36巻
2号
開始ページ 83
終了ページ 89
ISSN 0475-0071
言語 English
論文のバージョン publisher
NAID 120003497051
JaLCDOI 10.18926/46972
フルテキストURL mfe_37_1_051_060.pdf
著者 Namba, Akihiro| Toyota, Yoshitaka| Wada, Osami| Koga, Ryuji|
抄録 This paper presents pulse timing control method to reduce electromagnetic emission from multiple signal interconnections. Pulse timing control gives intentional skew between signals. Higher order harmonics are canceled because of the difference of the phase between the signals. Using this property, pulse timing control can reduce the EMI in wide frequency range. In this paper, we show that radiated electromagnetic field from multiple signal lines reduces its intensity to the same level of the field from one line by using pulse timing control. The result of measurement shows that EMI from four differential transmission lines can be reduced more than 9 dB in the 200 MHz to 800 MHz frequency range.
出版物タイトル Memoirs of the Faculty of Engineering, Okayama University
発行日 2002-11
37巻
1号
開始ページ 51
終了ページ 60
ISSN 0475-0071
言語 English
論文のバージョン publisher
NAID 80015683518