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Acoustic radiation from flows around a cascade of flat plates
Hiroshi Yokoyama,Akiyoshi Iida 한국전산유체공학회 2012 한국전산유체공학회 학술대회논문집 Vol.2012 No.11
To clarify the effects of acoustic resonance on flows around a cascade of flat plates, direct simulations and experiments were performed. The Reynolds number based on the chord length and the freestream velocity is 8.7×10<SUP>4</SUP>. The separation-to-thickness ratio s/d is 6.0. The results show that large-scale vortices composed of fine-scale vortices are shed from the downstream edges of the plates. When the acoustic resonance occurs, the coherence between the velocity fluctuations in the wake of a plate and that of the neighboring plate becomes higher. This means that the synchronization of the shedding of the vortices occurs in the wakes of the neighboring plates. The mode of the synchronization is an anti-phase mode. As a result, the acoustic waves radiated from neighboring plates are superposed on each other, and the standing waves generated between plates are reinforced.
( Akihito Iida ),( Hiroshi Kaneko ),( Toshihiro Konagaya ),( Kunio Kasugai ) 대한소화기기능성질환·운동학회(구 대한소화관운동학회) 2012 Journal of Neurogastroenterology and Motility (JNM Vol.18 No.3
The gastric barostat study is the gold standard method for evaluating gastric perception and accommodation. This technique has serious drawbacks, such as expense and invasiveness. Several drinking tests have been developed as noninvasive methods. Such tests are easily performed without special instruments and are well tolerated. We have reported that (1) a threshold volume inducing mild bloating in the slow nutrient drinking test might be an alternative parameter of gastric accommodation volume as determined by the barostat method and (2) the maximum satiety volume in the drinking test correlated positively with the pressure to induce severe discomfort in healthy volunteers, indicating that the slow nutrient drinking test may be useful for evaluating accommodation volume and the threshold to induce severe discomfort. However, the correlation between the maximum satiety drinking volume and accommodation volume as measured by the barostat study has been controversial. Therefore, validation of a certain nutrient drink test for measuring gastroduodenal function might be recommended in each institution. (J Neurogastroenterol Motil 2012;18:332-335)
( Tomoya Iida ),( Suguru Nakagaki ),( Shuji Satoh ),( Haruo Shimizu ),( Hiroyuki Kaneto ),( Hiroshi Nakase ) 대한장연구학회 2017 Intestinal Research Vol.15 No.2
Background/Aims: Although multiple treatment options exist for the management of sigmoid colon volvulus, no study has examined the factors associated with successful endoscopic detorsion. This study aimed to examine the clinical course of patients with sigmoid colon volvulus and to identify factors related to successful endoscopic detorsion. Methods: This study included 30 cases (21 patients) of sigmoid volvulus from among 545 cases of intestinal obstruction at a single center. We retrospectively examined the clinical course and the factors associated with the possibility of endoscopic detorsion of sigmoid colon volvulus. Results: The rate of laxative use among the study participants was 76.2%; the rate of comorbid neuropsychiatric disorders was 61.9%; and 57.1% of patients had a history of open abdominal surgery. All patients were initially treated with endoscopic detorsion, and this procedure had a 61.9% success rate. The recurrence rate after detorsion was as high as 46.2%, but detorsion during revision endoscopy was possible in all cases. Statistical analysis revealed that the absence of abdominal tenderness (P =0.027), the use of laxatives (P =0.027), and a history of open abdominal surgery (P =0.032) were factors predictive of successful endoscopic detorsion. Conclusions: The results of our study are consistent with previous reports with respect to the success rate of endoscopic detorsion, the subsequent recurrence rate, and the proportion of patients requiring surgical treatment. In addition, we identified the absence of abdominal tenderness, the use of laxatives, and history of open abdominal surgery as factors predicting successful endoscopic detorsion of sigmoid colon volvulus. (Intest Res 2017;15:215-220)
( Takashi Nonaka ),( Yusuke Sekino ),( Hiroshi Iida ),( Eiji Yamada ),( Hidenori Ohkubo ),( Eiji Sakai ),( Takuma Higurashi ),( Kunihiro Hosono ),( Hiroki Endo ),( Tomoko Koide ),( Hirokazu Takahashi 대한소화기기능성질환·운동학회 2013 Journal of Neurogastroenterology and Motility (JNM Vol.19 No.2
The gastrointestinal motility effects of endogenous incretin hormones enhanced by dipeptidyl peptidase-IV (DPP-IV) inhibitors have not yet been sufficiently investigated. The aim of this study was to determine whether single pre-prandial sitagliptin, the DPP-IV inhibitor, administration might have an effect on the rate of liquid gastric emptying using the 13C-acetic acid breath test. Methods Ten healthy male volunteers participated in this randomized, two-way crossover study. The subjects fasted for overnight and were randomly assigned to receive 50 mg sitagliptin 2 hours before ingestion of the liquid test meal (200 kcal per 200 mL, containing 100 mg 13C-acetate) or the test meal alone. Under both conditions, breath samples were collected for 150 minutes following the meal. Liquid gastric emptying was estimated by the values of the following parameters: the time required for 50% emptying of the labeled meal (T1/2), the analog to the scintigraphy lag time for 10% emptying of the labeled meal (Tlag), the gastric emptying coefficient and the regression-estimated constants (β and k), calculated by using the 13CO2 breath excretion curve using the conventional formulae. The parameters between the 2 test conditions were compared statistically. Results No significant differences in the calculated parameters, including T1/2, Tlag, gastric emptying coefficient or β and k, were observed between the 2 test conditions. Conclusions The present study revealed that single-dose sitagliptin intake had no significant influence on the rate of liquid gastric emptying in asymptomatic volunteers.
Munhoz Luciana,Nishimura Danielle Ayumi,Iida Christyan Hiroshi,Watanabe Plauto Christopher Aranha,Arita Emiko Saito 대한영상치의학회 2021 Imaging Science in Dentistry Vol.51 No.3
Purpose: This study aimed to summarize the impact of neck and head radiation treatment on maxillofacial structures detected on panoramic radiographs. Materials and Methods: In this systematic review, the authors searched PubMed Central, Embase, Scopus, Cochrane Central Register of Controlled Trials, Web of Science, and Google Scholar for original research studies up to February 2020 that included the following Medical Subject Headings keywords: words related to “radiotherapy” and synonyms combined with keywords related to “panoramic radiography” and “oral diagnosis” and synonyms. Only original studies in English that investigated the maxillofacial effects of radiotherapy via panoramic radiographs were included. The quality of the selected manuscripts was evaluated by assessing the risk of bias using Cochrane’s ROBINS-I tool for non-randomized studies. Results: Thirty-three studies were eligible and included in this review. The main objectives pertained to the assessment of the effects of radiation on maxillofacial structures, including bone architecture alterations, periodontal space widening, teeth development abnormalities, osteoradionecrosis, and implant bone loss. The number of participants evaluated ranged from 8 to 176. Conclusion: The interaction between ionizing radiation and maxillofacial structures results in hazard to the tissues involved, particularly the bone tissue, periosteum, connective tissue of the mucosa, and endothelium. Hard tissue changes due to radiation therapy can be detected on panoramic radiographs.
Munhoz, Luciana,Nishimura, Danielle Ayumi,Iida, Christyan Hiroshi,Watanabe, Plauto Christopher Aranha,Arita, Emiko Saito Korean Academy of Oral and Maxillofacial Radiology 2021 Imaging Science in Dentistry Vol.51 No.-
Purpose: This study aimed to summarize the impact of neck and head radiation treatment on maxillofacial structures detected on panoramic radiographs. Materials and Methods: In this systematic review, the authors searched PubMed Central, Embase, Scopus, Cochrane Central Register of Controlled Trials, Web of Science, and Google Scholar for original research studies up to February 2020 that included the following Medical Subject Headings keywords: words related to "radiotherapy" and synonyms combined with keywords related to "panoramic radiography" and "oral diagnosis" and synonyms. Only original studies in English that investigated the maxillofacial effects of radiotherapy via panoramic radiographs were included. The quality of the selected manuscripts was evaluated by assessing the risk of bias using Cochrane's ROBINS-I tool for non-randomized studies. Results: Thirty-three studies were eligible and included in this review. The main objectives pertained to the assessment of the effects of radiation on maxillofacial structures, including bone architecture alterations, periodontal space widening, teeth development abnormalities, osteoradionecrosis, and implant bone loss. The number of participants evaluated ranged from 8 to 176. Conclusion: The interaction between ionizing radiation and maxillofacial structures results in hazard to the tissues involved, particularly the bone tissue, periosteum, connective tissue of the mucosa, and endothelium. Hard tissue changes due to radiation therapy can be detected on panoramic radiographs.
OH, Hong-Shik,YOSHINAGA, Yuko,KANEKO, Takane,IIDA, Hiroshi,MO ̄RI, Takayuki 濟州大學校 基礎科學硏究所 2003 基礎科學硏究 Vol.16 No.2
In order to re-examine the taxonomic position of the Korean striped field mouse, Apodemus agrarius chejuensis from the Cheju Island, external value and skull characters were compared among A. agratius coreae from the Korean Peninsula, A. speciosus, A. argenteus, and A. semotus. Skull characters of A. agratius chejuensis (Cheju population) and A. agrarius coreae (mainland population) were fitted onto different clines. In particular, distances between the posterior and of incisive foramina and anterior end of the first upper molar were critically different between these two subspecies. These evidences support the specific division of 'Apodemus chejuensis' for the population inhabiting the Cheju Island from A. agratius in the mainland, as proposed by Koh and Yoo(1992).