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Numerical Study on Microbial Depolymerization Process of Xenobiotic Polymer

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Numerical Study on Microbial Depolymerization Process of Xen...

Mathematical Modeling and Computational Analysis of Underwater Topography with Global Positioning and Echo Sounder Data

作者： masaji watanabe Fusako Kawai Okayama University

关键词： Biodegradation Polymer Mathematical Model Inverse Problem Numerical Simulation

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Journal of Applied Mathematics and Physics 2021年第5期9卷 1171-1179页

作者： Satoshi Iwakami Masahiko Tamega Masahide Sanada Michiaki Mohri Yoshitaka Iwakami Naoki Okamoto Ryousuke Asou Shuji Jimbo masaji watanabe Earth Rise Company Inc. Okayama Japan Visiting Researcher Okayama University Okayama Japan Specially Appointed Professor Okayama University Okayama Japan

This study focuses on change of topography in a water area. Output data from a GPS unit and an echo sounder data were incorporated into analysis for construction of underwater topography. Comparison of two data sets ... 详细信息

关键词： Underwater Topography RTK-GPS Echo Sounder

Study on Change of Topography in Water Area with Field Measurement

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Study on Change of Topography in Water Area with Field Measu...

Mathematical Modeling and Computational Analysis of Underwater Topography with Global Positioning and Echo Sounder Data

作者： Satoshi Iwakami Masahiko Tamega Masahide Sanada Michiaki Mohri Yoshitaka Iwakami Naoki Okamoto Shuji Jimbo masaji watanabe Earth Rise Company Inc. Okayama University

Disastrous flood events in recent years include 2018 Japan floods（July 2018）,Typhoon 19（Hagibis, October 2019） and the following heavy rain event, and July 2020 heavy rain disaster. Such disastrous flood events are expected to occur more frequently as the climate change progresses, and it is indispensable to update information regarding water areas such as rivers, reservoirs, and coastal waters. This study demonstrates practical techniques to analyze underwater topography. Longitude and latitude components of ellipsoidal data recorded by a GPS receiver are projected to a rectangular coordinate system,and results are combined with vertical components including data recorded by an echo sounder unit so that tracks on an underwater floor are obtained. A mapping on a finite dimensional space of continuous functions over a triangular mesh is formulated, and its fixed point gives rise to an underwater floor that fits the tracks. Our techniques are illustrated with data obtained in measurement conducted in a reservoir called Kojima Lake located in Okayama Prefecture, Japan.

关键词： Underwater Topography RTK-GPS Echo Sounder Triangular Mesh Fixed Point Iteration

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Mathematical Modeling and Computational Analysis of Underwat...

Liver resection for hepatocellular carcinoma using a microwave tissue coagulator: Experience of 1118 cases

作者： Satoshi Iwakami Masahiko Tamega Masahide Sanada Michiaki Mohri Yoshitaka Iwakami Naoki Okamoto Ryousuke Asou Shuji Jimbo masaji watanabe Earth Rise Company Inc. Visiting Researcher Okayama University Specially Appointed Professor Okayama University

关键词： Underwater Topography RTK-GPS Echo Sounder

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World Journal of Gastroenterology 2015年第36期21卷 10400-10408页

作者： Kazunari Sasaki Masamichi Matsuda masaji Hashimoto Goro watanabe Department of Digestive Surgery Hepato-pancreatobiliary Surgery UnitToranomon Hospital

A I M : To present our extensive experience of hepatectomy for hepatocellular carcinoma using a microwave tissue coagulator to demonstrate the effectiveness of this device. METHODS: A total of 1118 cases(1990-2013) were reviewed,with an emphasis on intraoperative blood loss,postoperative bile leakage and fluid/abscess formation,and adaptability to anatomical resection and hepatectomy with hilar ***: The median intraoperative blood loss was 250 m L; postoperative bile leakage and fluid/abscess formation were seen in 3.0% and 3.3% of cases,respectively. Anatomical resection was performed in 275 cases,including 103 cases of hilar dissection that required application of microwave coagulation near the hepatic hilum. There was no clinically relevant biliary tract stricture or any vascular problems due to heat injury. Regarding the influence of cirrhosis on intraoperative blood loss,no significant difference was seen between cirrhotic and non-cirrhotic patients(P = 0.38),although cirrhotic patients tended to have smaller tumors and underwent less invasive operations. CONCLUSION: This study demonstrated outcomes of an extensive experience of hepatectomy using heat coagulative necrosis by microwave tissue coagulator.

关键词： Hepatectomy Hepatocellular carcinoma Microwave Mic

Surgical approach for hepatitis C virus-related hepatocellular carcinoma

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World Journal of Hepatology 2015年第1期7卷 70-77页

作者： Junichi Shindoh masaji Hashimoto Goro watanabe Hepatobiliary-pancreatic Surgery Division Department of Digestive SurgeryToranomon HospitalTokyo 105-8470Japan Okinaka Memorial Research Center for Adult Diseases Tokyo 105-8470Japan

Hepatitis C is a strong prognostic factor for patients with hepatocellular carcinoma(HCC). Although liver resection and liver transplantation offer the chance of a cure for HCC,adequate management of co-existing infection with hepatitis C virus(HCV) is important to enable better long-term outcomes after surgery for HCV-related HCC. For patients undergoing liver resection,perioperative anti-viral treatment is recommended,since a decreased HCV viral load itself is reportedly associated with a lower tumor recurrence rate and a longer overall survival. For patients undergoing transplanatations for HCC complicated by end-stage liver disease,the post-transplant management of HCV infection is also necessary to prevent progressive graft injury caused by active hepatitis under the immunosuppressive condition that is needed after liver transplantation. Although only a few lines of solid evidence are available for postoperative antiviral treatment because of the limited indication and frequent adverse events caused by conventional high-dose combination interferon therapy,new direct acting anti-viral agents would enable interferon-free anti-viral treatment with a higher virologic response and minimal side effects.

关键词： Hepatocellular carcinoma Hepatitis C Liverresection Liver transplantation Adjuvant therapy

Right hepatectomy for giant cavernous hemangioma with diffuse hemangiomatosis around Glisson's capsule

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World Journal of Gastroenterology 2014年第25期20卷 8312-8316页

作者： Yu Ohkura masaji Hashimoto Seigi Lee Kazunari Sasaki Masamichi Matsuda Goro watanabe Department of Digestive Surgery Hepato Pancreato Billiary Surgery UnitToranomon HospitalTokyo 105-8470Japan

Diffuse liver hemangiomatosis with giant cavernous hemangioma in adult is extremely rare. A 35 year-old woman presented to hospital with main complaint of epigastric pain and abdominal fullness. An enhanced computed tomography scan revealed a massive liver tumor in right lobe about 150 mm in size. There was contrast enhancement at the periphery of the mass consistent with a cavernous hemangioma. She underwent right hepatectomy. Histologically, it was diagnosed as a cavernous hemangioma. And also, hemangiomatous lesions were scattered around the Glisson’s capsule on the back ground liver. These hemangiomatous lesions were not recognized preoperatively. Even if we couldn’t diagnose hemangiomatosis around the main giant hemangioma preoperatively, we need to take enough surgical margins because the giant hemangioma has the potential to have small hemangiomatous lesions around the tumor. We reported right hepatectomy for giant cavernous hemangioma with diffuse hepatic hemangiomatosis without an extrahepatic lesion in an adult.

关键词： Giant cavernous hemangioma Hemangiomatosis Right hepatectomy Around Glisson’ s capsule Surgery

Retroperitoneal cavernous hemangioma resected by a pylorus preserving pancreaticoduodenectomy

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World Journal of Gastroenterology 2013年第28期19卷 4624-4629页

作者： Marie Hanaoka masaji Hashimoto Kazunari Sasaki Masamichi Matsuda Takeshi Fujii Kenichi Ohashi Goro watanabe Department of Digestive Surgery Toranomon Hospital Tokyo 105-8470 Japan Department of Pathology Toranomon Hospital Tokyo 105-8470 Japan Department of Pathology Yokohama City University Graduate School of Medicine Kanagawa 236-0004 Japan

A retroperitoneal hemangioma is a rare disease. We report on the diagnosis and treatment of a retroperitoneal hemangioma which had uncommonly invaded into both the pancreas and duodenum, thus requiring a pylorus preserving pancreaticoduodenectomy (PpPD). A 36-year-old man presented to our hospital with abdominal pain. An enhanced computed tomography scan without contrast enhancement revealed a 12 cm × 9 cm mass between the pancreas head and right kidney. Given the high rate of malignancy associated with retroperitoneal tumors, surgical resection was performed. Intraoperatively, the tumor was inseparable from both the duodenum and pancreas and PpPD was performed due to the invasive behavior. Although malignancy was suspected, pathological diagnosis identified the tumor as a retroperitoneal cavernous hemangioma for which surgical resection was the proper diagnostic and therapeutic procedure. Reteoperitoneal cavernous hemangioma is unique in that it is typically separated from the surrounding organs. However, clinicians need to be aware of the possibility of a case, such as this, which has invaded into the surrounding organs despite its benign etiology. From this case, we recommend that combined resection of inseparable organs should be performed if the mass has invaded into other tissues due to the hazardous nature of local recurrence. In summary, this report is the first to describe a case of retroperitoneal hemangioma that had uniquely invaded into surrounding organs and was treated with PpPD.

关键词： Retroperitoneal tumor Retroperitoneal cavernous hemangioma Cavernous hemangioma Pancreaticoduodenectomy Pylorus preserving pancreaticoduodenectomy

Original single-incision laparoscopic cholecystectomy for acute inflammation of the gallbladder

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World Journal of Gastroenterology 2012年第9期18卷 944-951页

作者： Kazunari Sasaki Goro watanabe Masamichi Matsuda masaji Hashimoto Department of Digestive Surgery Hepato Pancreato Biliary Surgery UnitToranomon Hospital

AIM： To investigate the safety and feasibility of our original single-incision laparoscopic cholecystectomy （SII_C） for acute inflamed gallbladder （AIG）.

关键词： Single-incision laparoscopic cholecystectomy Acute cholecystitis Acute cholangitis