A Divided Scheduling Method based on Structural Characteristics in Wireless

Yoshino, Yuriko,Hashimoto, Masafumi,Wakamiya, Naoki Korea Multimedia Society 2016 The journal of multimedia information system Vol.3 No.4

Wireless mesh networks (WMNs) are used for metropolitan area network that requires high network throughput for handling many users. TDMA-based access is a common solution for this problem and several scheduling methods have been proposed. However, existing heuristic methods have room for improvement at network throughput although they are low complexity. In this paper, we propose a novel divided scheduling method based on structural characteristics in order to improve network throughput in WMNs. It separately schedules neighbor links of gateways and that of the other links by different scheduling algorithms. Simulation-based evaluations show that our proposal improves up to 14% of network throughput compared with conventional scheduling algorithm script.

Guide Following Control Using Laser Range Sensor for a Smart Wheelchair

Koji Miyazaki,Masafumi Hashimoto,Masanari Shimada,Kazuhiko Takahashi 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8

This paper presents a guide following control(adriving support control) for a smart electric wheelchair, so that the wheelchair can follow a preceding person(guide). A walking guide is obtained from lasers can images by a nin-vehicle laser range sensor based on Kalman filter and data association, and the guide foot print is estimated. Based on position data of the foot print, acubicspline generate satarget path for the wheelchair. The wheelchair is controlled so that it can move along the guide foot print at a constant gap between the wheelchair and the guide. The experimental result validated the feasibility of the control method.

Successful endoscopic closure of an esophageal leak after endoscopic ultrasound-guided hepaticoesophagostomy by using n-butyl-2 cyanoacrylate

Renma Ito,Yusuke Hashimoto,Masafumi Ikeda 소화기인터벤션의학회 2019 International journal of gastrointestinal interven Vol.8 No.3

Endoscopic ultrasound-guided hepaticoesophagostomy (EUS-HES) refers to EUS-guided biliary access from the abdominal part of the esophagus, an uncommon choice of route for biliary drainage. In the patient reported herein, an esophageal laceration and leakage at the site of placement of a metal stent occurred a few days after EUS-HES. To plug the laceration, 0.5 mL of n-butyl-2 cyanoacrylate mixed with 1 mL of lipiodol was injected through an endoscopic retrograde cholangiopancreatography catheter. We performed EUS-guided transgastric drainage for drainage of the peritoneal fluid collection. The procedures were successful and the laceration eventually healed, with no further leakage.

Conversion of percutaneous cholecystostomy to transmural endoscopic ultrasound-guided gallbladder drainage in malignant biliary obstruction

Motoyasu Kan,Yusuke Hashimoto,Taro Shibuki,Gen Kimura,Kumiko Umemoto,Kazuo Watanabe,Mitsuhito Sasaki,Hideaki Takahashi,Hiroshi Imaoka,Izumi Ohno,Shuichi Mitsunaga,Masafumi Ikeda 소화기인터벤션의학회 2019 International journal of gastrointestinal interven Vol.8 No.2

Background: In patients with distal malignant biliary obstruction, it is a challenge to manage acute cholecystitis secondary to cystic duct obstruc-tion associated with tumor progression or stent compression. Percutaneous transhepatic gallbladder drainage (PTGBD) has been used as the treatment option of choice, because of its ease of performance and safety, but because of the use of an external drainage tube, some patients experience a de-creased quality of life. We report the technical success and clinical success of conversion from PTGBD to endoscopic ultrasound-guided gallbladder drainage (EUS-GBD) for the treatment of acute cholecystitis in patients with unresectable malignant biliary obstruction.Methods: We included the patients with cholecystitis secondary to unresectable malignant biliary obstruction who underwent conversion from PT-GBD to EUS-GBD in the study. After PTGBD for the treatment of acute cholecystitis, we performed EUS-GBD and a plastic stent or a self-expandable metal stent (SEMS) was placed for fistulostomy.Results: Fourteen patients (median age, 69 years; 9 males and 5 females) underwent conversion to EUS-GBD after clinical improvement of cholecys-titis by PTGBD. The technical success rate of the conversion from PTGBD to EUS-GBD was 100% (14/14). EUS-GBD was performed in a median of 9.5 days (range, 3–51 days) after PTGBD procedure, using mainly a plastic stent (13 patients) and a covered SEMS in one patient. The early (within 24 hours) adverse events rate was 14.3% (2/14), and the late (after 24 hours) adverse events rate was 7.1% (1/14). The rate of recurrence of cholecystitis was 28.6% (4/14). These patients underwent endoscopic re-intervention and there were no cases of further recurrence of cholecystitis. Conclusion: Conversion of PTGBD to EUS-GBD demonstrated a feasible and safe technique for acute cholecystitis in non-surgical candidates with malignant biliary obstruction.

Successful endoscopic closure of an esophageal leak after endoscopic ultrasound-guided hepaticoesophagostomy by using n-butyl-2 cyanoacrylate

Renma Ito,Yusuke Hashimoto,Masafumi Ikeda 소화기인터벤션의학회 2019 Gastrointestinal Intervention Vol.8 No.3

Endoscopic ultrasound-guided hepaticoesophagostomy (EUS-HES) refers to EUS-guided biliary access from the abdominal part of the esophagus, an uncommon choice of route for biliary drainage. In the patient reported herein, an esophageal laceration and leakage at the site of placement of a metal stent occurred a few days after EUS-HES. To plug the laceration, 0.5 mL of n-butyl-2 cyanoacrylate mixed with 1 mL of lipiodol was injected through an endoscopic retrograde cholangiopancreatography catheter. We performed EUS-guided transgastric drainage for drainage of the peritoneal fluid collection. The procedures were successful and the laceration eventually healed, with no further leakage.

Conversion of percutaneous cholecystostomy to transmural endoscopic ultrasound-guided gallbladder drainage in malignant biliary obstruction

Motoyasu Kan,Yusuke Hashimoto,Taro Shibuki,Gen Kimura,Kumiko Umemoto,Kazuo Watanabe,Mitsuhito Sasaki,Hideaki Takahashi,Hiroshi Imaoka,Izumi Ohno,Shuichi Mitsunaga,Masafumi Ikeda 소화기인터벤션의학회 2019 Gastrointestinal Intervention Vol.8 No.2

Background: In patients with distal malignant biliary obstruction, it is a challenge to manage acute cholecystitis secondary to cystic duct obstruc-tion associated with tumor progression or stent compression. Percutaneous transhepatic gallbladder drainage (PTGBD) has been used as the treatment option of choice, because of its ease of performance and safety, but because of the use of an external drainage tube, some patients experience a de-creased quality of life. We report the technical success and clinical success of conversion from PTGBD to endoscopic ultrasound-guided gallbladder drainage (EUS-GBD) for the treatment of acute cholecystitis in patients with unresectable malignant biliary obstruction.Methods: We included the patients with cholecystitis secondary to unresectable malignant biliary obstruction who underwent conversion from PT-GBD to EUS-GBD in the study. After PTGBD for the treatment of acute cholecystitis, we performed EUS-GBD and a plastic stent or a self-expandable metal stent (SEMS) was placed for fistulostomy.Results: Fourteen patients (median age, 69 years; 9 males and 5 females) underwent conversion to EUS-GBD after clinical improvement of cholecys-titis by PTGBD. The technical success rate of the conversion from PTGBD to EUS-GBD was 100% (14/14). EUS-GBD was performed in a median of 9.5 days (range, 3–51 days) after PTGBD procedure, using mainly a plastic stent (13 patients) and a covered SEMS in one patient. The early (within 24 hours) adverse events rate was 14.3% (2/14), and the late (after 24 hours) adverse events rate was 7.1% (1/14). The rate of recurrence of cholecystitis was 28.6% (4/14). These patients underwent endoscopic re-intervention and there were no cases of further recurrence of cholecystitis. Conclusion: Conversion of PTGBD to EUS-GBD demonstrated a feasible and safe technique for acute cholecystitis in non-surgical candidates with malignant biliary obstruction.

Human Behavior recognition Using Regression Models

Mamoru Saito,Katsuhisa Kitaguchi,Hiroyuki Nishida,Masafumi Hashimoto 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8

This paper proposes a method for human behavior recognition by estimating the human state, i.e., position and orientation, using regression models. In the method, human silhouette in video images is detected by background sub traction technique, and the upper part of human silhouette is used for extracting the image feature. Linear regression technique is introduced to create a model that associates the image feature with human state. Human state estimation from the currently observed image is being performed through this model. Experiments are conducted on indoor space where an Omni Directional Vision(ODV) sensor is installed to the ceiling of crossing hall way. The feasibility and accuracy of our method is discussed through the experimental results.

Endoscopic Findings and Treatment of Gastric Neoplasms in Familial Adenomatous Polyposis

Sato, Chihiro,Takahashi, Kazuya,Sato, Hiroki,Naruse, Takumi,Nakajima, Nao,Takatsuna, Masafumi,Mizuno, Ken-ichi,Hashimoto, Satoru,Takeuchi, Manabu,Yokoyama, Junji,Kobayashi, Masaaki,Terai, Shuji The Korean Gastric Cancer Association 2022 Journal of gastric cancer Vol.22 No.-

Purpose: Gastric neoplasia is a common manifestation of familial adenomatous polyposis (FAP). This study aimed to elucidate the clinical characteristics, endoscopic features including fundic gland polyposis (FGPsis), and treatment outcomes of gastric neoplasms (GNs) in patients with FAP. Materials and Methods: A total of 35 patients diagnosed with FAP, including nine patients from four pedigrees who underwent esophagogastroduodenoscopy (EGD), were investigated regarding patient characteristics, GN morphology, and treatment outcomes. Results: Twenty-one patients (60.0%) had 38 GNs; 33 (86.8%) and 5 (13.2%) were histologically diagnosed with adenocarcinoma and adenoma, respectively. There were no specific patient characteristics related to GNs.Nodule-type GNs were more prevalent in patients with FGP than without (52.2% vs. 0.0%, P=0.002) in the upper body of the stomach. Conversely, depressed-type GNs were fewer in patients with FGPsis than in those without (13.0% vs. 73.3%, P<0.001). Slightly elevated-type GNs were observed in both groups (34.8% vs. 20.0%, P=0.538). Even within pedigrees, the background gastric mucosa and types of GNs varied. In total, 24 GNs were treated with endoscopic submucosal dissection (ESD) and eight with endoscopic mucosal resection (EMR). EMR was selected for GNs with FGPsis because of the technical difficulty of ESD, resulting in a lower en bloc resection rate (62.5% vs. 100%, P=0.014). Conclusions: Our study indicates the necessity of routine EGD surveillance in patients diagnosed with FAP. Notably, the morphology and location of GNs differed between patients with and without FGPsis. Endoscopic treatment and outcomes require more attention in cases of FGPsis.

Endoscopic Findings and Treatment of Gastric Neoplasms in Familial Adenomatous Polyposis

Sato Chihiro,Takahashi Kazuya,Sato Hiroki,Naruse Takumi,Nakajima Nao,Takatsuna Masafumi,Mizuno Ken-ichi,Hashimoto Satoru,Takeuchi Manabu,Yokoyama Junji,Kobayashi Masaaki,Terai Shuji 대한위암학회 2022 Journal of gastric cancer Vol.22 No.4

Purpose Gastric neoplasia is a common manifestation of familial adenomatous polyposis (FAP). This study aimed to elucidate the clinical characteristics, endoscopic features including fundic gland polyposis (FGPsis), and treatment outcomes of gastric neoplasms (GNs) in patients with FAP. Materials and Methods A total of 35 patients diagnosed with FAP, including nine patients from four pedigrees who underwent esophagogastroduodenoscopy (EGD), were investigated regarding patient characteristics, GN morphology, and treatment outcomes. Results Twenty-one patients (60.0%) had 38 GNs; 33 (86.8%) and 5 (13.2%) were histologically diagnosed with adenocarcinoma and adenoma, respectively. There were no specific patient characteristics related to GNs. Nodule-type GNs were more prevalent in patients with FGP than without (52.2% vs. 0.0%, P=0.002) in the upper body of the stomach. Conversely, depressed-type GNs were fewer in patients with FGPsis than in those without (13.0% vs. 73.3%, P<0.001). Slightly elevated-type GNs were observed in both groups (34.8% vs. 20.0%, P=0.538). Even within pedigrees, the background gastric mucosa and types of GNs varied. In total, 24 GNs were treated with endoscopic submucosal dissection (ESD) and eight with endoscopic mucosal resection (EMR). EMR was selected for GNs with FGPsis because of the technical difficulty of ESD, resulting in a lower en bloc resection rate (62.5% vs. 100%, P=0.014). Conclusions Our study indicates the necessity of routine EGD surveillance in patients diagnosed with FAP. Notably, the morphology and location of GNs differed between patients with and without FGPsis. Endoscopic treatment and outcomes require more attention in cases of FGPsis. Purpose Gastric neoplasia is a common manifestation of familial adenomatous polyposis (FAP). This study aimed to elucidate the clinical characteristics, endoscopic features including fundic gland polyposis (FGPsis), and treatment outcomes of gastric neoplasms (GNs) in patients with FAP. Materials and Methods A total of 35 patients diagnosed with FAP, including nine patients from four pedigrees who underwent esophagogastroduodenoscopy (EGD), were investigated regarding patient characteristics, GN morphology, and treatment outcomes. Results Twenty-one patients (60.0%) had 38 GNs; 33 (86.8%) and 5 (13.2%) were histologically diagnosed with adenocarcinoma and adenoma, respectively. There were no specific patient characteristics related to GNs. Nodule-type GNs were more prevalent in patients with FGP than without (52.2% vs. 0.0%, P=0.002) in the upper body of the stomach. Conversely, depressed-type GNs were fewer in patients with FGPsis than in those without (13.0% vs. 73.3%, P<0.001). Slightly elevated-type GNs were observed in both groups (34.8% vs. 20.0%, P=0.538). Even within pedigrees, the background gastric mucosa and types of GNs varied. In total, 24 GNs were treated with endoscopic submucosal dissection (ESD) and eight with endoscopic mucosal resection (EMR). EMR was selected for GNs with FGPsis because of the technical difficulty of ESD, resulting in a lower en bloc resection rate (62.5% vs. 100%, P=0.014). Conclusions Our study indicates the necessity of routine EGD surveillance in patients diagnosed with FAP. Notably, the morphology and location of GNs differed between patients with and without FGPsis. Endoscopic treatment and outcomes require more attention in cases of FGPsis.