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Monitoring Fatigue Damge with a Crack Propagation Senson
Takeshi Mori,Kazuki Komon,Makoto Abe 한국강구조학회 2006 International Journal of Steel Structures Vol.6 No.4
If fatigue damage or its possibility can be estimated easily and economically, the eficiency of maintenance inspection forsteel bridges is considered to be drastically advanced. For this purpose, a system in which thin stainless steel with a crack isstuck on a bridge member to measure crack propagation and the cumulative amount of fatigue damage was developed.made clear yet. This study aims at making the quantitative relationship clear and developing a high sensitive monitoring sensorin order to accumulate the crack propagation and shorten the monitoring period, and the applicability and accuracy of thefatigue damage monitoring sensors have been examined through stress intensity factor analyses and fatigue crack propagationtests.
Takeshi Mori 한국강구조학회 2008 International Journal of Steel Structures Vol.8 No.3
Fatigue strength and crack propagation behavior of cruciform welded joints in which fatigue cracks originate from weld roots have been already examined by a lot of studies under single axial loading condition. In the present study, fatigue strength evaluation formula for cruciform welded joints failing from weld roots under bi-axial loading condition has been proposed on the basis of the results of fatigue tests on 2 types of specimens with different weld penetration and fatigue crack propagation analyses on models with various plate thickness, weld size and weld penetration depth under several bi-axial loading conditions.
Mori, Kenjiro,Ito, Takumi,Sato, Hanako,Munemura, Hiroka,Matsumoto, Takeshi,Choi, Changhoon Council on Tall Building and Urban Habitat Korea 2015 International journal of high-rise buildings Vol.4 No.1
Recently, new keywords such as "Resilience" and "Repairability" have been discussed from the perspective of the sustainability of damaged structures after a severe disaster. To evaluate the repairability and recovery of structures, it is necessary to establish an analytical method that can simulate the behavior of repaired structures. Furthermore, it is desirable to establish an evaluation method for the structural performance of repaired structures. This study investigates the repairability and recovery of steel members that are damaged by local buckling or cracks. This paper suggests a simple analytical model for repaired steel members, in order to simulate the inelastic behavior and evaluate the recoverability of the structural performance. There is good agreement between the analytical results and the test results. The proposed analytical method and model can effectively evaluate the recoverability.
Takeshi Okamoto,Takashi Sasaki,Tsuyoshi Takeda,Takafumi Mie,Chinatsu Mori,Takaaki Furukawa,Yuto Yamada,Akiyoshi Kasuga,Masato Matsuyama,Masato Ozaka,Naoki Sasahira 대한소화기내시경학회 2024 Clinical Endoscopy Vol.57 No.1
Background/Aims: Selective bile duct or pancreatic duct cannulation remains a significant initial hurdle in endoscopic retrograde cholangiopancreatography (ERCP) despite advances in endoscopy and accessories. This study evaluated our experience with a rotatable sphincterotome in cases of difficult cannulation. Methods: We retrospectively reviewed ERCP cases using TRUEtome, a rotatable sphincterotome, as a rescue device for cannulation at a cancer institute in Japan from October 2014 to December 2021. Results: TRUEtome was used in 88 patients. Duodenoscopes were used for 51 patients, while single-balloon enteroscopes (SBE) were used for 37 patients. TRUEtome was used for biliary and pancreatic duct cannulation (84.1%), intrahepatic bile duct selection (12.5%), and strictures of the afferent limb (3.4%). Cannulation success rates were similar in the duodenoscope and SBE groups (86.3% vs. 75.7%, p=0.213). TRUEtome was more commonly used in cases with steep cannulation angles in the duodenoscope group and in cases requiring cannulation in different directions in the SBE group. There were no significant differences in adverse events between the two groups. Conclusions: The cannulation sphincterotome was useful for difficult cannulations in both unaltered and surgically altered anatomies. It may be an option to consider before high-risk procedures such as precut and endoscopic ultrasound-guided rendezvous techniques.
Differences in the panoramic appearance of cleft alveolus patients with or without a cleft palate
Fujii Takeshi,Kuwada Chiaki,Kise Yoshitaka,Fukuda Motoki,Mori Mizuho,Nishiyama Masako,Nozawa Michihito,Naitoh Munetaka,Ariji Yoshiko,Ariji Eiichiro 대한영상치의학회 2024 Imaging Science in Dentistry Vol.54 No.1
Purpose: The purpose of this study was to clarify the panoramic image differences of cleft alveolus patients with or without a cleft palate, with emphases on the visibility of the line formed by the junction between the nasal septum and nasal floor (the upper line) and the appearances of the maxillary lateral incisor. Materials and Methods: Panoramic radiographs of 238 patients with cleft alveolus were analyzed for the visibility of the upper line, including clear, obscure or invisible, and the appearances of the maxillary lateral incisor, regarding congenital absence, incomplete growth, delayed eruption and medial inclination. Differences in the distribution ratio of these visibility and appearances were verified between the patients with and without a cleft palate using the chi- square test. Results: There was a significant difference in the visibility distribution of the upper line between the patients with and without a cleft palate (p<0.05). In most of the patients with a cleft palate, the upper line was not observed. In the unilateral cleft alveolus patients, the medial inclination of the maxillary lateral incisor was more frequently observed in patients with a cleft palate than in patients without a cleft palate. Conclusion: Two differences were identified in panoramic appearances. The first was the disappearance (invisible appearance) of the upper line in patients with a cleft palate, and the second was a change in the medial inclination on the affected side maxillary lateral incisor in unilateral cleft alveolus patients with a cleft palate.
Synthesis of Soluble Oligo(spiroorthocarbonate)s and Their Application to Networked Polymers
( Yasuyuki Mori ),( Takeshi Endo ) 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.1
A series of soluble oligo(spiroorthocarbonate)s (OSOCs) were synthesized by polycondensation of tetraethylorthocarbonate with pentaerythritol derivatives. The pentaerythritol derivatives used herein were synthesized from pentaerythritol by attaching substituents on it to improve the solubility of themselves and the resulting OSOCs. The OSOCs were employed as comonomers in the cationic polymerization of epoxide initiated by sulfonium salt. The resulting volume changes during the copolymerization were evaluated. As a result, the spiroorthocarbonate moiety of OSOCs underwent double ring-opening reaction, leading to the efficient diminution of the volume shrinkage upon the copolymerization.
Sumire Mori,Toshihiko Tomita,Kazuki Fujimura,Haruki Asano,Tomohiro Ogawa,Takahisa Yamasaki,Takashi Kondo,Tomoaki Kono,Katsuyuki Tozawa,Tadayuki Oshima,Hirokazu Fukui,Takeshi Kimura,Jiro Watari,Hiroto 대한소화기 기능성질환∙운동학회 2019 Journal of Neurogastroenterology and Motility (JNM Vol.25 No.4
Background/Aims Magnesium oxide (MgO) has been frequently used as a treatment for chronic constipation (CC) since the 1980s in Japan. The aim of this study is to evaluate its therapeutic effects of MgO in Japanese CC patients. Methods We conducted a randomized, double-blind placebo-controlled study. Thirty-four female patients with mild to moderate constipation were randomly assigned to either placebo (n = 17) or MgO group (n = 17) 0.5 g × 3/day for 28 days. Primary endpoint was overall improvement over the 4-week study period. Secondary endpoints were changes from baseline in spontaneous bowel movement (SBM), response rates of complete spontaneous bowel movement (CSBM), stool form, colonic transit time (CTT), abdominal symptom, and quality of life. Results One patient failed to complete the medication regimen and was omitted from analysis: data from 16 placebo and 17 MgO patients were analyzed. The primary endpoint was met by 25.0% of placebo vs 70.6% of MgO group (P = 0.015). MgO significantly improved SBM changes compared to placebo (P = 0.002). However, MgO did not significantly improved response rates of CSBM compared to placebo (P = 0.76). In addition, MgO significantly improved Bristol stool form scale changes (P < 0.001) and significantly improved CTT compared to the placebo group (P < 0.001). MgO significantly improved the Japanese version of the patient assessment of constipation quality of life (P = 0.003). Conclusion Our placebo-controlled study demonstrated that MgO was effective treatment for improving defecation status and shortened CTT in Japanese CC patients with mild to moderate symptoms. Background/Aims Magnesium oxide (MgO) has been frequently used as a treatment for chronic constipation (CC) since the 1980s in Japan. The aim of this study is to evaluate its therapeutic effects of MgO in Japanese CC patients. Methods We conducted a randomized, double-blind placebo-controlled study. Thirty-four female patients with mild to moderate constipation were randomly assigned to either placebo (n = 17) or MgO group (n = 17) 0.5 g × 3/day for 28 days. Primary endpoint was overall improvement over the 4-week study period. Secondary endpoints were changes from baseline in spontaneous bowel movement (SBM), response rates of complete spontaneous bowel movement (CSBM), stool form, colonic transit time (CTT), abdominal symptom, and quality of life. Results One patient failed to complete the medication regimen and was omitted from analysis: data from 16 placebo and 17 MgO patients were analyzed. The primary endpoint was met by 25.0% of placebo vs 70.6% of MgO group (P = 0.015). MgO significantly improved SBM changes compared to placebo (P = 0.002). However, MgO did not significantly improved response rates of CSBM compared to placebo (P = 0.76). In addition, MgO significantly improved Bristol stool form scale changes (P < 0.001) and significantly improved CTT compared to the placebo group (P < 0.001). MgO significantly improved the Japanese version of the patient assessment of constipation quality of life (P = 0.003). Conclusion Our placebo-controlled study demonstrated that MgO was effective treatment for improving defecation status and shortened CTT in Japanese CC patients with mild to moderate symptoms.