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Arai, Makoto The Society of Naval Architects of Korea 2002 Journal of ship and ocean technology Vol.6 No.1
A new concept for launching free-fall lifeboats, proposed by Yokohama National University is described in this paper. It has been pointed out that, using the conventional single-skid free-fall system, the potential for dangerous lifeboat motions (in which the lifeboat moves backward or jerks on the surface after entering the water) increases with the fall height of the lifeboat. One of the principal causes of this undesirable motion is vertical rotation of the lifeboat during its restricted fall at the edge of the launching skid. Thus a new "double-skid"launching concept is proposed to effectively eliminate the rotation of the lifeboat at the skid end and to enable the lifeboat to move smoothly after entering the water. In order to evaluate the performance of the proposed method, a series of model experiments and numerical simulations is carried out in which two lifeboat models with overall lengths of 1 meter and 6 meters are used. The effects of design parameters such as skid angle and skid height are investigated, and an example of the implementation of this new system at the stern of a large merchant ship is illustrated.
Tsunenori Arai,Minoru Obara,Miya yoshikawa,Makoto Kikuchi,Satoko Kawauchi,Hiroko Matsuyama 慶熙大學校 레이저 工學硏究所 1996 레이저공학 Vol.7 No.-
We developed novel monitoring of corneal surface hydration during photorefractive keratectomy (PRK) in order to improve undercorrection of the central part of cornea (Central Island), which might be attributed to excessive hydration. We employed pulsed photothermal radiometry(PPTR), noncontact and noninvasive method to measure the absorption coefficient, to monitor corneal surface hydration. We performed two model experiments: gelatin gel experiments and porcine corneal in vitro experiments. In the case of the gelatin gel experiments, the absorption coefficient of the gelatin gel was changed by gelatin density. The e-folding decay time of transient infrared radiation waveform from the irradiated surface was prolonged with decreasing gelatin density. This measured e-folding decay time was good agreement with the result of theoretical calculations. Using porcine cornea, we observed the e-folding decay time extension during ArF excimer laser ablation of the porcine cornea. Our method may be available to improve the reproducibility in PRK.
( Kenichiro Okimoto ),( Makoto Arai ),( Hideaki Ishigami ),( Keiko Saito ),( Shoko Minemura ),( Daisuke Maruoka ),( Tomoaki Matsumura ),( Tomoo Nakagawa ),( Tatsuro Katsuno ),( Masaki Suzuki ),( Yukio 대한간학회 2018 Gut and Liver Vol.12 No.1
Background/Aims: Eosinophilic esophagitis (EoE) is often erroneously diagnosed as gastroesophageal reflux disease (GERD). The aim of this study is to investigate the prevalence of EoE and the expression of tight junction (TJ) proteins in patients with GERD symptoms. Methods: One hundred patients with GERD symptoms and 10 healthy controls were prospectively studied. Sixty-two patients had symptoms refractory to proton pump inhibitors (PPI). All patients underwent esophageal biopsy. Patients were diagnosed with EoE if the number of eosinophil granulocytes per high-power field was ≥15. Immunohistochemical analysis of TJ proteins (claudin-1, claudin-4, occludin, and zonula occludin-1 [ZO-1]) was performed. Results: EoE was diagnosed in six of 100 patients (6%) with GERD symptoms and in six patients (9.7%) of 62 patients with PPI-refractory GERD. Only one had typical EoE endoscopic findings. The proportion of ZO-1-positive cells was significantly lower in the lower than in the middle esophagus (56.0%±14.0% vs 66.0%±11.5%, p<0.05). There were no significant correlations between TJ protein expression and GERD symptoms. Conclusions: The prevalence of EoE among patients with PPI-refractory GERD is approximately 10%. Regardless of endoscopic findings, esophageal biopsy is crucial in diagnosing EoE. The disruption of ZO-1 expression in the lower esophagus is significantly associated with GERD symptoms. (Gut Liver 2018;12:30-37)
Shuhei Fujita,Makoto Tomita,문승호,Hirokuni Arai 한국자료분석학회 2013 Journal of the Korean Data Analysis Society Vol.15 No.3
In clinical practice, medical professionals are likely to rely on various scoring systems and their suggested cutoffs to evaluate the severity of disease or the risk to patients and the key of scoring system and database is the reliable cutoff. We herein report a novel and concise method to calculate the significant cutoff by exploiting serial testing with the result of tricuspid valve surgery. In tricuspid surgery, tricuspid annuloplication with annuloplasty ring has been common procedure to fix tricuspid regurgitation, but the optimal ring size has not been determined. We defined the new index TARI (Tricuspid Annuloplasty Ring size Index), which normalizes the ring size by body surface area. We tested all cutoff candidates of TARI sequentially and confirmed which value was the most significant cutoff to achieve the best result. Our method would be simple and be widely applicable for any dataset that has negative or positive correlations.
Young-Chang P. Arai,Makoto Nishihara,Jun Sato,Takahiro Ushida,Atsuko Morimoto,Hiroki Sakurai,Yusuke Ohmichi,Izumi Makino,Chiharu Suzuki 셀메드 세포교정의약학회 2012 셀메드 (CellMed) Vol.2 No.2
Kampo medicine, a Japanese traditional herbal medicine, has been used in clinical practice in Japan. The most appropriate Kampo formula should be chosen for each individual by the four diagnostic procedures. Fuku shin, the abdominal exam, is one of the most important approaches in the procedures. There are several abdominal conformations (signs) when administering Fuku shin. In Kampo medicine, psychiatric illness-marked by depression and anxiety-has been shown to be related with an abdominal conformation, Shin ka hi koh (Epigastric Obstructive Hardness). The aim was to see the occurrence of abdominal conformations in each level of depression and anxiety symptoms. Two hundred fifteen patients were assigned to high-, moderate-, or low-level psychiatric comorbidity based on the Hospital Anxiety and Depression Scale and were studied regarding the occurrence of major abdominal conformations. Moderate and high psychopathological groups showed the higher occurrence of Shin ka hi koh [Low, 21%; Moderate, 67%; High, 74%] (p < 0.0001). In conclusion, moderate and high psychopathological patients showed the higher occurrence of a specific abdominal sign.
Fabrication of Large-area Micro-lens Arrays with Fast Tool Control
Young Jin Noh,Yoshikazu Arai,Makoto Tano,Wei Gao 한국정밀공학회 2008 International Journal of Precision Engineering and Vol.9 No.4
This paper describes a fast tool control (FTC)-based diamond turning process for fabricating large-area high-quality micro-lens arrays. The developed FTC unit has a stroke of 48 ㎛ and a resonance frequency of 4.9 kHz. Micro-lens arrays were fabricated using a micro-cutting tool with a nose radius of 50 ㎛. The FTC unit was integrated 'with a force sensor so that the initial position of the micro-cutting tool with respect 10 the workpiece surface could be detected through monitoring the contacting force. The length and depth of the designed parabolic micro-lens profile were 190 ㎛ and 20㎛, respectively. A micro-lens array was fabricated on a cylinder surface over an area of φ 55 ㎜ × 40 ㎜.
Fabrication of Large-area Micro-lens Arrays with Fast Tool Control
Noh, Young-Jin,Arai, Yoshikazu,Tano, Makoto,Gao, Wei Korean Society for Precision Engineering 2008 International Journal of Precision Engineering and Vol.9 No.4
This paper describes a fast tool control (FTC)-based diamond turning process for fabricating large-area high-quality micro-lens arrays. The developed FTC unit has a stroke of $48{\mu}m$ and a resonance frequency of 4.9 kHz. Micro-lens arrays were fabricated using a micro-cutting tool with a nose radius of $50{\mu}m$. The FTC unit was integrated with a force sensor so that the initial position of the micro-cutting tool with respect to the workpiece surface could be detected through monitoring the contacting force. The length and depth of the designed parabolic micro-lens profile were $190{\mu}m$ and $20{\mu}m$, respectively. A micro-lens array was fabricated on a cylinder surface over an area of ${\phi}55 mm{\times}40 mm$.
( Takeshi Suzuki ),( Yosuke Seki ),( Tomoaki Matsumura ),( Makoto Arai ),( Toyoyuki Hanazawa ),( Yoshitaka Okamoto ),( Haruhiko Suzuki ),( Kazunori Kasama ),( Akiko Umezawa ),( Yoshimoti Kurokawa ),( 대한소화기기능성질환·운동학회 2022 Journal of Neurogastroenterology and Motility (JNM Vol.28 No.1
Background/Aims The Lyon Consensus defined parameters based on upper endoscopy and 24-hour combined multichannel intraluminal impedancepH (MII-pH), that conclusively establish the presence of gastroesophageal reflux disease (GERD). However, the true role of upper endoscopy and MII-pH to evaluate patients with extraesophageal symptoms (EES) has not been well established. Hypopharyngeal MII (HMII), which directly measures laryngopharyngeal reflux (LPR) events, has been utilized to evaluate patients with EES suggestive of LPR. Methods This was a retrospective study involving patients with EES for > 12 weeks despite proton pump inhibitor therapy, and had no endoscopic confirmatory evidence for GERD and negative MII-pH. All patients were subsequently referred for further evaluation of EES with “unknown” etiology and underwent laryngoscopy and HMII. Based on HMII, abnormal proximal exposure (APE) was defined as LPR ≥ 1/day and/or full column reflux (reflux 2 cm distal to the upper esophageal sphincter) > 4/day. Patients with APE were offered antireflux surgery (ARS) and the outcome of ARS was objectively assessed using Reflux Symptom Index. Results Of 21 patients with EES which was thought to be GERD-unrelated based on endoscopy and MII-pH, 17 patients (81%) had APE. Eight patients with APE who had undergone ARS had significant symptomatic improvement in the Reflux Symptom Index score (19.6 ± 4.9 pre-ARS to 5.8 ± 1.4 post-ARS, P = 0.008). Conclusions A conventional diagnostic approach using endoscopy and MII-pH may not be sufficient to evaluate patients with EES suggestive of LPR. HMII is essential to evaluate patients with EES, and APE could be a reliable indicator for successful treatment outcomes. (J Neurogastroenterol Motil 2022;28:69-77)