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EFFECTIVE WAY OF MEASURING K₁ BY MEANS OF ACPD TECHNIQUE
Saka, M.,Abe, H.,Lee, J. H. ENGINEERING TRIBOLOGY RESEARCH INSTITUTE KYUNGPOOK 1998 INTERNATIONAL SYMPOSIUM ON HIGH PERFORMANCE OF TRI Vol.1998 No.-
In order to develop an effective way of meaduring the ModeⅠstress intensity factor, K₁, by means of the alternating current potential drop(ACPD) technique, the change in potential drop due to load for both ferromagnetic and paramagnetic materials contaning a two-dimensional surface crack was investigated. The effects of the magnetic field, the demagnetization and the crack length on the change in potential drop were examined. The amount of the change in potential drop was shown to increase largely by increasing the amount of the magentic flux in the measuring system. Also in the case of the measuring system with a large amount of the magnetic flux in the air, the relationship between the change in potential drop and that in K₁was indicated to be linear without any treatment and it was shown that the demagnetization had almost no effect on the change in potential drop. The change in potential drop was independent of the crack length. The effective way of determining K₁by means of the ACPD technique is to use a measuring system with a large amount of the magnetic flux in the air.
Shinichi Abe,Masayuki Fukuda,Shigeki Yamane,Hideki Saka,Yukio Katori,Jose Francisco Rodrí,guez-Vá,zquez,Gen Murakami 대한해부학회 2013 Anatomy & Cell Biology Vol.46 No.2
We examined pharyngeal nerve courses in paraffin-embedded sagittal sections from 10 human fetuses, at 25–35 weeks of gestation, by using S100 protein immunohistochemical analysis. After diverging from the glossopharyngeal and vagus nerves at the level of the hyoid bone, the pharyngeal nerves entered the constrictor pharyngis medius muscle, then turned upward and ran superiorly and medially through the constrictor pharyngis superior muscle, to reach either the levator veli palatini muscle or the palatopharyngeus muscle. None of the nerves showed a tendency to run along the posterior surface of the pharyngeal muscles. Therefore, the pharyngeal nerve plexus in adults may become established by exposure of the fetal intramuscular nerves to the posterior aspect of the pharyngeal wall because of muscle degeneration and the subsequent rearrangement of the topographical relationship between the muscles that occurs after birth.
Case Study of Landslide Monitoring based on GNSS measurement and LiDAR Analysis
( Shuhei Abe ),( Norio Oikawa ),( Tomoyuki Takami ),( Takumi Sato ),( Sakae Mukoyama ) 대한지질공학회 2019 대한지질공학회 학술발표회논문집 Vol.2019 No.2
Recently, the application of GNSS measurement and LiDAR analysis at landslide sites has been increasing in Japan. In 2018, a large scale landslide occurred at Agatsu, Fukushima Pref., Japan, during snow-melting period. The field reconnaissance assumed the high speed displacement at site. To investigate the displacement behavior of the ground surface in the whole area, we conducted Image matching analysis using LiDAR-DEM data of two different time periods. Furthermore, we also conducted observation by a statistical analysis based on GNSS measurement in order to observe the mm-order displacement in real time. As result, two areas were detected in this site, which had different trends in the displacement direction and the displacement amount. The cumulative displacement and the displacement velocity of the river facing area were ~4 m and ~28 mm/h as of June 12th 2018, respectively. The failure of the site was forecasted to occur within few days, but GNSS measurement observation showed that the displacement was converged as result from applying emergency countermeasures such as deep wells. The case study shows the effective application of GNSS measurement and LiDAR analysis in monitoring the behavior of the landslide site.
Hiroki Sato,Yusuke Fujiyoshi,Hirofumi Abe,Hironari Shiwaku,Junya Shiota,Chiaki Sato,Hiroyuki Sakae,Masaki Ominami,Yoshitaka Hata,Hisashi Fukuda,Ryo Ogawa,Jun Nakamura,Tetsuya Tatsuta,Yuichiro Ikebuchi 대한소화기 기능성질환∙운동학회 2022 Journal of Neurogastroenterology and Motility (JNM Vol.28 No.2
Background/AimsPatients with achalasia-related esophageal motility disorders (AEMDs) frequently present with dilated and sigmoid esophagus, and develop esophageal diverticulum (ED), although the prevalence and patients characteristics require further elucidation. MethodsWe conducted a multicenter cohort study of 3707 patients with AEMDs from 14 facilities in Japan. Esophagography on 3682 patients were analyzed. ResultsStraight (n = 2798), sigmoid (n = 684), and advanced sigmoid esophagus (n = 200) were diagnosed. Multivariate analysis revealed that long disease duration, advanced age, obesity, and type I achalasia correlate positively, whereas severe symptoms and integrated relaxation pressure correlate negatively with development of sigmoid esophagus. In contrast, Grade II dilation (3.5-6.0 cm) was the most common (52.9%), while grade III dilation (≥ 6 cm) was rare (5.0%). We found early onset, male, obesity, and type I achalasia correlated positively, while advanced age correlated negatively with esophageal dilation. Dilated and sigmoid esophagus were found mostly in types I and II achalasia, but typically not found in spastic disorders. The prevalence of ED was low (n = 63, 1.7%), and non-dilated esophagus and advanced age correlated with ED development. Patients with right-sided ED (n = 35) had a long disease duration (P = 0.005) with low integrated relaxation pressure values (P = 0.008) compared with patients with left-sided ED (n = 22). Patients with multiple EDs (n = 6) had lower symptom severity than patients with a single ED (P = 0.022). ConclusionsThe etiologies of dilated esophagus, sigmoid esophagus, and ED are considered multifactorial and different. Early diagnosis and optimal treatment of AEMDs are necessary to prevent these conditions.