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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.
( Masaki Kuwatani ),( Hiroshi Kawakami ),( Yoko Abe ),( Shuhei Kawahata ),( Kazumichi Kawakubo ),( Kimitoshi Kubo ),( Naoya Sakamoto ) The Editorial Office of Gut and Liver 2015 Gut and Liver Vol.9 No.2
A 72-year-old man with jaundice by ampullary adenocarcinoma was treated at our hospital. For biliary decompression, a transpapillary, fully covered, self-expandable metal stent (FCSEMS) was deployed. Four days later, the patient developed acute cholangitis. Endoscopic carbon dioxide cholangiography revealed kinking of the common bile duct above the proximal end of the FCSEMS. A 7-F double-pigtail plastic stent was therefore placed through the FCSEMS to correct the kink, straightening the common bile duct (CBD) and improving cholangitis. This is the first report of a unique use of a double-pigtail plastic stent to correct CBD kinking. The placement of a double-pigtail plastic stent can correct CBD kinking, without requiring replacement or addition of a FCSEMS, and can lead to cost savings. (Gut Liver, 2015;9:251-252)
( Kazumichi Kawakubo ),( Hiroshi Kawakami ),( Masaki Kuwatani ),( Shin Haba ),( Taiki Kudo ),( Yoko Abe ),( Shuhei Kawahata ),( Manabu Onodera ),( Nobuyuki Ehira ),( Hiroaki Yamato ),( Kazunori Eto ) 대한소화기학회 2014 Gut and Liver Vol.8 No.3
Endoscopic ultrasound (EUS) and endoscopic retrograde cholangiopancreatography (ERCP) are essential for diagnosing and treating pancreatobiliary diseases. Single-session EUS and ERCP are considered to be essential in reducing the duration of hospital stays; however, complications are a primary concern. The aim of this study was to evaluate the safety and efficacy of single-session EUS and ERCP. Sixty-eight patients underwent single-session EUS and ERCP at a tertiary referral center between June 2008 and December 2012. We retrospectively reviewed patient data from a prospectively maintained EUS-ERCP database and evaluated the procedural characteristics and complications. Thirty-eight patients (56%) underwent diagnostic EUS, and 30 patients (44%) underwent EUS fine-needle aspiration, which had an overall accuracy of 100%. Sixty patients (89%) underwent therapeutic ERCP, whereas the remaining eight procedures were diagnostic. Thirteen patients underwent biliary stone extraction, and 48 underwent biliary drainage. The median total procedural time was 75 minutes. Complications were observed in seven patients (10%). Six complications were post-ERCP pancreatitis, which were resolved using conservative management. One patient developed Mallory-Weiss syndrome, which required endoscopic hemostasis. No sedation-related cardiopulmonary complications were observed. Single-session EUS and ERCP provided accurate diagnosis and effective management with a minimal complication rate.
Tayyaba Mateen,Kazuaki Okamoto,Sun-Lin Chung,Kuo-Lung Wang,Hao-Yang Lee,Shuhei Abe,Yuji Mita,Hafiz U. Rehman,Masaru Terabayashi,Hiroshi Yamamoto 한국지질과학협의회 2019 Geosciences Journal Vol.23 No.6
U-Pb-Hf isotopes of zircons from the granitic intrusive rocks in the Iwakuni area of southwest Japan are determined by LA-ICP-MS analysis. The Gamano Granodiorite belonging to the Older Ryoke Granites of the Ryoke Belt yielded U-Pb mean age of 92.3 ± 2.6 Ma (MSWD = 1.8). The Namera Granite belonging to the Younger Ryoke Granites of the Ryoke Belt yielded U-Pb mean age of 106.3 ± 1.6 Ma (MSWD = 2.3). The Shimokuhara Granite belonging to the Hiroshima Granites of the San-yo Belt yielded U-Pb mean age of 103.8 ± 1.5 Ma (MSWD = 0.32). A granite porphyry sample taken from about 15 m thick dike discordantly intruded into pelitic schist of the Ryoke metamorphic rocks yielded U-Pb mean age of 92.5 ± 1.6 Ma (MSWD = 0.63). Hf isotope data, obtained from the same dated zircon grains, show initial 176Hf/177Hf isotopic ratios referred to as “εHf(t)” generally ranging between –4.8 and +1.1 except an anomalously low value (–15.0) from an inherited core. The εHf(t) values, calculated with average crustal 176Lu/177Hf ratio of 0.015, correspond to Hf isotope crustal model ages between 1474 to 1087 Ma (Mesoproterozoic). The Gamano Graodiorite has long been regarded to be a syn-tectonic intrusion, but the zircon ages and εHf(t) values are similar to those of the post-tectonic granite porphyry dike. The results of this study together with available U-Pb zircon ages of granitic rocks in the Iwakuni area reported elsewhere reveal that the order of emplacement indicated by the U-Pb zircon ages are much discrepant with the traditional classification, the Older Ryoke, the Younger Ryoke. It is better to refrain from the use of “Older” and “Younger” for the collective names of the granitic intrusive bodies.