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Estimation Method for Pitching Moment Non-linearities of Cranked Arrow Wing at Low Speed
Hiroki Ishibashi,Taro Imamura,Kenichi Rinoie 한국항공우주학회 2022 International Journal of Aeronautical and Space Sc Vol.23 No.4
Cranked arrow wing is a wing planform often used for supersonic transport (SST) to satisfy both low-speed characteristics during takeoff/landing and supersonic flight characteristics. During take-off and landing, an angle of attack (AoA) of the SST becomes high to generate sufficient lift. Leading-edge vortices generate additional lift (vortex lift) in such a situation. Additionally, vortex breakdown and outboard flow separation caused by the interference of leading-edge vortices occur. The wing’s aerodynamic forces change non-linearly with increasing AoA due to these phenomena. An estimation program based on potential flow for aerodynamic forces of the wing has been developed to investigate wing planforms and high-lift devices in past studies. The estimation program has three methods for modifying the results of potential flow to estimate the non-linear change of aerodynamic forces. In this study, a method to estimate the outboard flow separation is developed, and a method to estimate the vortex breakdown is improved to reduce differences between estimated and experimental results. By comparing estimated results using the present method with some experimental results, improvement of estimated results is observed.
Hiroyuki Takashima,Tsuneo Takebayashi,Hiroki Shishido,Mitsunori Yoshimoto,Rui Imamura,Yoshihiro Akatsuka,Yoshinori Terashima,Hiroyoshi Fujiwara,Masateru Nagae,Toshikazu Kubo,Toshihiko Yamashita 대한척추외과학회 2016 Asian Spine Journal Vol.10 No.1
Study Design: Prospective study based on magnetic resonance (MR) imaging of the lumbar spinal root of the intervertebral foramen. Purpose: This study was to compare MR three-dimensional (3D) sequences for the evaluation of the lumbar spinal root of the intervertebral foramen. Overview of Literature: The diagnosis of spinal disorders by MR imaging is commonly performed using two-dimensional T1- and T2-weighted images, whereas 3D MR images can be used for acquiring further detailed data using thin slices with multi-planar reconstruction. Methods: On twenty healthy volunteers, we investigated the contrast-to-noise ratio (CNR) of the lumbar spinal root of the intervertebral foramen with a 3D balanced sequence. The sequences used were the fast imaging employing steady state acquisition and the coherent oscillatory state acquisition for the manipulation of image contrast (COSMIC). COSMIC can be used with or without fat suppression (FS). We compared these sequence to determine the optimized visualization sequence for the lumbar spinal root of the intervertebral foramen. Results: For the CNR between the nerve root and the peripheral tissue, these were no significant differences between the sequences at the entry of foramen. There was a significant difference and the highest CNR was seen with COSMIC-FS for the intra- and extraforamen. Conclusions: In this study, the findings suggest that the COSMIC-FS sequences should be used for the internal or external foramen for spinal root disorders.
Monocular 3D Palm Posture Estimation Based on Feature-Points Robust against Finger Motion
Yoshiaki Mizuchi,Yoshinobu Hagiwara,Akimasa Suzuki,Hiroki Imamura,Yongwoon Choi 제어로봇시스템학회 2013 제어로봇시스템학회 국제학술대회 논문집 Vol.2013 No.10
The usability of wearable augmented reality (AR) systems would improve by letting users arbitrarily display virtual information on their palm and simultaneously manipulate it as tablet computers or smartphones. To realize such interaction between users and virtual information, we aim to robustly estimate 3-D palm posture against finger motion. This is based on the assumption that finger motion is separately estimated from palm posture and applied to manipulation of displayed information. In addition, the capability of electric sources, sensors, and processors are very limited in wearable computers. For this reason, by using a monocular camera and estimating palm posture from only a few image feature-points, we achieve an efficient estimation that satisfies real-time constraint on wearable computers. The accuracy and the robustness of our method are demonstrated by qualitative and quantitative comparison with a widely-used cardboard maker. Additionally, we confirmed that our method is run on a mobile computer at the average of 12.44 msec per frame.
Tadayuki Takagi,Mitsuru Sugimoto,Hidemichi Imamura,Yosuke Takahata,Yuki Nakajima,Rei Suzuki,Naoki Konno,Hiroyuki Asama,Yuki Sato,Hiroki Irie,Jun Nakamura,Mika Takasumi,Minami Hashimoto,Tsunetaka Kato 대한소화기내시경학회 2023 Clinical Endoscopy Vol.56 No.1
high tumors. Therefore, sufficient sampling of histological specimens is necessary in cases of unresectable pancreatic cancer (UR-PC). This multicenter study investigated the efficacy of endoscopic ultrasound-guided fine-needle biopsy (EUS-FNB) using a Franseen needlefor MSI evaluation in patients with UR-PC. Methods: A total of 89 patients with UR-PC who underwent endoscopic ultrasound-guided fine-needle aspiration (EUS-FNA) orEUS-FNB using 22-G needles at three hospitals in Japan (2018–2021) were enrolled. Fifty-six of these patients (FNB 23 and FNA 33)were followed up or evaluated for MSI. Patient characteristics, UR-PC data, and procedural outcomes were compared between patientswho underwent EUS-FNB and those who underwent EUS-FNA. Results: No significant difference in terms of sufficient tissue acquisition for histology was observed between patients who underwentEUS-FNB and those who underwent EUS-FNA. MSI evaluation was possible significantly more with tissue samples obtained usingEUS-FNB than with tissue samples obtained using EUS-FNA (82.6% [19/23] vs. 45.5% [15/33], respectively; p<0.01). In the multivariateanalysis, EUS-FNB was the only significant factor influencing the possibility of MSI evaluation. Conclusions: EUS-FNB using a Franseen needle is desirable for ensuring sufficient tissue acquisition for MSI evaluation.