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CLOUD PROFILING RADAR ON EARTHCARE SATELLITE
Nobuhiro Takahashi,Toshiyoshi Kimura,Yuichi Ohno,Hiroaki Horie,Hirotaka Nakatsuka,Kenji Sato,Yasuo Sakaide,Kazuyuki Okada,Hiroshi Kumagai 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
The design and current status of EarthCARE/CPR are described in this report. Basic design of CPR will be confirmed in this year, and engineering model development and testing will be done this year and the next year. In parallel with the development activity of CPR, algorithm development activity is in progress. The data from CPR is expected to contribute to reveal the detailed information of clouds and to the studies on global warming. It is also expected the continuation of cloud observation from CloudSat data that was launched in 2006[4].
Takahashi, Keitaro,Ueno, Nobuhiro,Sasaki, Takahiro,Kobayashi, Yu,Sugiyama, Yuya,Murakami, Yuki,Kunogi, Takehito,Ando, Katsuyoshi,Kashima, Shin,Moriichi, Kentaro,Tanabe, Hiroki,Kamikokura, Yuki,Yuzawa, The Korean Gastric Cancer Association 2021 Journal of gastric cancer Vol.21 No.1
Gastric adenocarcinoma of the fundic gland mucosa type (GA-FGM) was proposed as a new variant of gastric adenocarcinoma of the fundic gland type (GA-FG). However, at present, the influence of Helicobacter pylori and the speed of progression and degree of malignancy in GA-FGM remain unclear. Herein, we report the first case of intramucosal GA-FGM that was endoscopically observed before and after H. pylori eradication over 15 years. The lesion showed the same tumor size with no submucosal invasion and a low MIB-1 labeling index 15 years after its detection using endoscopy. The endoscopic morphology changed from 0-IIa before H. pylori eradication to 0-IIa+IIc and then 0-I after H. pylori eradication. These findings suggest that the unaltered tumor size reflects low-grade malignancy and slow growth, and that the endoscopic morphology is influenced by H. pylori eradication.
Toyoshima, Morio,Takahashi, Nobuhiro,Jono, Takashi,Yamawaki, Toshihiko,Nakagawa, Keizo,Arai, Katsuyoshi 통신위성우주산업연구회 2002 Joint Conference on Satellite Communications Vol.2002 No.-
Optical communications in the presence of atmospheric turbulence are affected by the tubulence-induced optical scintillation. The optical scintillation makes the communication quality, i.e. bit error rate (BER), degrade. Because of the intrinsically narrow optical beam, the random pointing-jitter also generates additional signal fading on the communication signal. A broader optical beam could mitigate the signal fading, but would require greater transmitted power than that for the original beam to achieve the same required BER. In this paper, the average BER is derived from the probability density function (PDF) of the optical signal in the presence of atmospheric turbulence and random pointing-jitter. The joint PDF, of the lognormal PDF caused by atmospheric turbulence and the beta PDF of the random pointing-jitter, is derived by using the characteristic function of each PDF. It is shown that an optimum beam divergence of the transmitting laser beam exists, and the optimum value changes slightly with the atmospheric conditions. The beam divergence angle should be about 7 times larger than the random pointing-jitter of the optical tracking system. An example of the optimum link estimates for the tracking and communication channels are shown for a ground-to-satellite optical communication link.
Application of C-band polarimetric radar on rainfall-type classification
Yukari Shusse,Nobuhiro Takahashi,Katsuhiro Nakagawa,Shinsuke Satoh,Toshio Iguchi 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
The rainfall-type classification method which gives a judgment of the presence of the melting layer in addition to a conventional convective-stratiform classification was developed using a C-band polarimetric radar. The convective-stratiform separation was conducted based on the horizontal Zhh field. The melting layer was detected using the vertical profile of phv. Four rainfall types are identified by a combination of these two classifications: 1) convective rainfall with melting layer, 2) convective rainfall with no melting layer, 3) stratiform rainfall with melting layer, and 4) stratiform rainfall with no melting layer.
Overview of Optical Inter-orbit Communication Engineering Test Satellite (OICETS)
Yamakawa, Shiro,Toyoshima, Morio,Takahashi, Nobuhiro,Yamawaki, Toshihiko,Arai, Katsuyoshi 통신위성우주산업연구회 2003 Joint Conference on Satellite Communications Vol.2003 No.-
The optical inter-orbit communication test satellite (OICETS) has been developed by NASDA (National Space Development Agency of Japan) in order to perform the inter-satellite optical link experiment with a GEO-satellite of ESA (European Space Agency) named "ARTEMIS (Advanced Relay and Technology Mission Satellite)". OICETS will be launched into a circular low earth orbit in 2005. In this paper, the overview of OICETS and the optical terminal "LUCE(Laser Utilizing Communications Equipment)" boarded on OICETS is introduced. The objective of OICETS and the optical terminal "LUCE(Laser Utilizing Communications Equipment)" boarded on OICETS is introduced. The objective of OICETS is to perform on-orbit demonstrations of pointing, acquisition and tracking technologies, and other key technology elements for optical inter-orbit communications. The data rates for forward (ARTEMIS to OICETS) and return (OICETS to ARTEMIS) links correspond to 2 and 50 Mbps at the optical wavelength of $0.8\mum$, respectively. The proto-flight tests of the OICETS flight model was finished in January 2002. In addition, results of an optical compatibility test between LUCE and the optical terminal of ARTEMIS in geo-stationary orbit at $21.5^{\circ}$ East is described. The engineering model (EM) of LUCE is placed at ESAs Optical Ground Station (OGS) in Tenerife, Canary Island. The aim of the test is to verify the end-to-end optical interfaces such as intensity, wavelength, polarization, modulation scheme of optical signals and also acquisition sequences between both optical terminals.
16S rRNA Genes PCR-RFLP Analysis for Rapid Identification of Oral Anaerobic Gram-Positive Bacilli
Sato, Takuichi,Matsuyama, Junko,Takahashi, Nobuhiro Korean Academy of Oral Biology and the UCLA Dental 2000 International Journal of Oral Biology Vol.25 No.3
Oral anaerobic gram-positive bacilli are frequently isolated from oral infectious sites including carious, endodontic and periodontal lesions. Identification of these bacteria by conventional methods are labor-intensive and time-consuming because of poor growth and non-reactivity in most of the biochemical tests. In this study, in order to develop the rapid identification method for these bacteria, restriction fragment length polymorphism analysis of PCR-amplified 16S ribosomal RNA genes〔16S rRNA genes PCR-RFLP〕was applied to anaerobic gram-positive bacilli such as Eubacterium, Mogibacterium and Pseudoramibacter, and the obtained findings were compared with the results of biochemical identification methods. 16S rRNA gene sequences were amplified from isolated genomic DNA samples by the PCR with universal primers. The PCR products were then purified and characterized by single digestion with restriction endonuclease HpaII, and this allowed discrimination among the respective reference strains〔type strains of ATCC〕. In addition, 55 strains were assigned to one of the reference species on the basis of their restriction profiles by digestion with HpaII, and these results were corresponded to those of biochemical identification methods. Furthermore, the 16S rRNA gene sequences were accessed from the GenBank and the RDP data base, and the restriction profiles expected are in accordance with the obtained RFLP patterns in this study. therefore, 16S rRNA genes PCR-RFLP is a rapid and reliable identification method for oral gram-positive bacilli including Eubacterium, Mogibacterium and Pseudoramibacter.
Matsuyama, Junko,Sato, Takuichi,Takahashi, Nobuhiro Korean Academy of Oral Biology and the UCLA Dental 2000 International Journal of Oral Biology Vol.25 No.3
Restriction fragment length polymorphism (RFLP) analysis of polymerase chain reaction〔PCR〕-amplified 16S ribosomal RNA genes〔16S rRNA genes PCR-RFLP〕using MnlI has been shown to be a useful tool in defferentiating oral Actinomyces species. In this study, the method was applied to Actinomyces isolates from human dental plaque〔n=77〕, and the findings were compared with those obtained by biochemical identification methods. As a result, 46 strains out of 55 A. naeslundii genospecies 1 strains were mis-identified as A. israelii〔n=35〕 and A. meyeri〔n=11〕; and 2 strains out of 12 A. naeslundii genospecies 2 strains were mis-identified as A. israelii by biochemical identification methods. Therefore, one should pay attention to the mis-identification of a. naeslundii species by conventional biochemical tests.
Yasuhiro Ito,Takuichi Sato,Keiko Yamaki,Gen Mayanagi,Kazuhiro Hashimoto,Hidetoshi Shimauchi,Nobuhiro Takahashi 한국미생물학회 2012 The journal of microbiology Vol.50 No.1
This study aimed to profile the microflora in infected root canals before and after root canal treatment using cultureindependent methods. Six infected root canals in singlerooted teeth with periapical lesions from five subjects were included. Quantification of total bacteria was performed by real-time PCR with primers targeting 16S rRNA genes. PCR products with universal 16S rRNA gene primers were cloned and partially sequenced, and bacterial identification at the species level was performed by comparative analysis with the GenBank database. The concentration of extracted DNA before treatment was higher than that after root canal treatment, although the difference was not statistically significant. Sequence analysis revealed that oral bacteria such as Fusobacterium, Streptococcus, Olsenella, and Pseudoramibacter detected in cases before root canal treatment disappeared after treatment. These results suggest that the root canal microflora are distinct before and after root canal treatment, and that treatment changes the microflora in both quantity and quality.