Drift displacement data based estimation of cumulative plastic deformation ratios for buildings

Akira Nishitani,Chisa Matsui,Yushiro Hara,Ping Xiang,Yoshihiro Nitta,Tomohiko Hatada,Ryota Katamura,Iwao Matsuya,Takashi Tanii 국제구조공학회 2015 Smart Structures and Systems, An International Jou Vol.15 No.3

The authors’ research group has developed a noncontact type of sensors which directly measurethe inter-story drift displacements of a building during a seismic event. Soon after that event, suchseismically-induced drift displacement data would provide structural engineers with useful information tojudge how the stories have been damaged. This paper presents a scheme of estimating the story cumulativeplastic deformation ratios based on such measured drift displacement information toward the building safetymonitoring. The presented scheme requires the data of story drift displacements and the ground motionacceleration. The involved calculations are rather simple without any detailed information on structuralelements required: the story hysteresis loops are first estimated and then the cumulative plastic deformationratio of each story is evaluated from the estimated hysteresis. The effectiveness of the scheme isdemonstrated by utilizing the data of full-scale building model experiment performed at E-defense andconducting numerical simulations.

Poster Session : PS 0295 ; Geriatrics : Changes of Physical Strength, Serum Adiponectin and Serum Lipids for 5-Years Time Course of the Elderly in a Japanese Countryside

( Motohiko Hara ),( Hiromi Nakamura Thomas ),( Kuniyasu Takahashi ),( Hiroaki Nobuhara ),( Ikuo Murohashi ),( Sachiko Yoshioka ),( Akira Haketa ),( Takahiro Ueno ),( Masayoshi Soma ) 대한내과학회 2014 대한내과학회 추계학술대회 Vol.2014 No.1

Background: We studied changes of physical strength, serum adiponectin and serum lipids in the same elder individuals for 5-years. Methods: We examined 156 volunteers (37 males and 119 females, mean age: 71. 5 years) in Ogano- town, Saitama, Japan. All subjects were examined in a battery of physical strength tests and serum laboratory examinations including BMI, blood pressure (BP), grip strength (GS), 10m walking time (10m WT), timed up and go test (TUG) and serum examinations consisting of HDL-cholesterol (HDL), triglyceride (TG) and adiponectin. All subjects were re-tested the battery of tests 5 years later. Results: In the 5-years, the significant changes from the baseline showed in the mean values of GS, TUG and serum adiponectin (males:6. 5μg/ml to 4. 8μg/ml, females: 8. 8μg/ml to 6. 7μg/ml) (p<0. 05, paired-t test). We divided the subjects into 3 groups by serum adiponectin levels; less than 4. 0μg/ml (19 males and 27 females), 4. 0 to 10. 0μg/ ml (14males and 72 females) and higher than 10. 0μg/ml (4 males and 20 females), and compared each groups. In the group of low adiponectin level, mean values of TG (males: 191. 7mg/dl, females: 176. 9mg/dl) was signifi cant higher than that of normal adiponectin level group (TG: males:116. 9mg/dl, females:138. 2mg/dl) and high adiponectin level group (TG: males: 102. 6mg/dl, females: 102. 7mg/dl), and mean values of HDL (males: 48. 5mg/ dl, females: 53. 0mg/dl) was signifi cant lower than that of normal adiponectin level group (HDL: males: 56. 8mg/dl, females: 58. 1mg/dl) and high adiponectin level group (HDL: males: 64. 3mg/dl, females: 70. 0mg/dl) in both of males and females. Conclusions: In elderly, 5-year changes are clear in physical tests. Serum adiponectin level showed decreasing for 5-years in males and females, and low serum adiponectin value has some relation with serum high TG and low HDL.

Partial state setting of controller for constrained systems

Naoyuki Hara,Akira Kojima 제어로봇시스템학회 2006 제어로봇시스템학회 국제학술대회 논문집 Vol.2006 No.10

Drift displacement data based estimation of cumulative plastic deformation ratios for buildings

Nishitani, Akira,Matsui, Chisa,Hara, Yushiro,Xiang, Ping,Nitta, Yoshihiro,Hatada, Tomohiko,Katamura, Ryota,Matsuya, Iwao,Tanii, Takashi Techno-Press 2015 Smart Structures and Systems, An International Jou Vol.15 No.3

The authors' research group has developed a noncontact type of sensors which directly measure the inter-story drift displacements of a building during a seismic event. Soon after that event, such seismically-induced drift displacement data would provide structural engineers with useful information to judge how the stories have been damaged. This paper presents a scheme of estimating the story cumulative plastic deformation ratios based on such measured drift displacement information toward the building safety monitoring. The presented scheme requires the data of story drift displacements and the ground motion acceleration. The involved calculations are rather simple without any detailed information on structural elements required: the story hysteresis loops are first estimated and then the cumulative plastic deformation ratio of each story is evaluated from the estimated hysteresis. The effectiveness of the scheme is demonstrated by utilizing the data of full-scale building model experiment performed at E-defense and conducting numerical simulations.

Ultrasonically Assisted Grinding for Mirror Surface Finishing of Dies with Electroplated Diamond Tools

Isobe, Hiromi,Hara, Keisuke,Kyusojin, Akira,Okada, Manabu,Yoshihara, Hideo Korean Society for Precision Engineering 2007 International Journal of Precision Engineering and Vol.8 No.2

This paper describes ultrasonically assisted grinding used to obtain a glossy surface quickly and precisely. High-quality surfaces are required for plastic injection molding dies used in the production of plastic parts such as dials for cellular phones. Traditionally, in order to finish the dies, manual polishing by a skilled worker has been required after the machining processes, such as electro discharge machining (EDM), which leaves an affected layer, and milling, which leaves tooling marks. However, manual polishing causes detrimental geometrical deviations of the die and consumes several days to finish a die surface. Therefore, a machining process for finishing dies without manual polishing to improve the surface roughness and form accuracy would be extremely valuable. In this study, a 3D positioning machine equipped with an ultrasonic spindle was used to conduct grinding experiments. An electroplated diamond tool was used for these experiments. Generally, diamond tools cannot grind steel because of excessive wear as a result of carbon atoms diffusing into bulk steel and chips. However, ultrasonically assisted grinding can achieve a fine surface (roughness Rz of $0.4{\mu}m$) on die steel without severe tool wear. The final aim of this study is to realize mirror surface grinding for injection molding dies without manual polishing. To do this, it is necessary to fabricate an electroplated diamond tool with high form accuracy and low run-out. This paper describes a tool-making method for high precision grinding and the grinding performance of a self-electroplated tool. The ground surface textures, tool performance and tool life were investigated A ground surface roughness Rz of 0.14 um was achieved Our results show that the spindle speed, feed rate and cross feed affected the surface texture. One tool could finish $5000mm^2$ of die steel surface without any deterioration of the ground surface roughness.

Ultrasonically Assisted Grinding for Mirror Surface Finishing of Dies with Electroplated Diamond Tools

Hiromi Isobe,Keisuke Hara,Akira Kyusojin,Manabu Okada,Hideo Yoshihara 한국정밀공학회 2007 International Journal of Precision Engineering and Vol.8 No.2

This paper describes ultrasonically assisted grinding used to obtain a glossy surface quickly and precisely. High-quality surfaces are required for plastic injection molding dies used in the production of plastic parts such as dials for cellular phones. Traditionally, in order to finish the dies, manual polishing by a skilled worker has been required after the machining processes, such as electro discharge machining (EDM), which leaves an affected layer, and milling, which leaves tooling marks. However, manual polishing causes detrimental geometrical deviations of the die and consumes several days to finish a die surface. Therefore, a machining process for finishing dies without manual polishing to improve the surface roughness and form accuracy would be extremely valuable. In this study, a 3D positioning machine equipped with an ultrasonic spindle was used to conduct grinding experiments. An electroplated diamond tool was used for these experiments. Generally, diamond tools cannot grind steel because of excessive wear as a result of carbon atoms diffusing into bulk steel and chips. However, ultrasonically assisted grinding can achieve a fine surface (roughness Rz of 0.4 ㎛) on die steel without severe tool wear. The final aim of this study is to realize mirror surface grinding for injection molding dies without manual polishing. To do this, it is necessary to fabricate an electroplated diamond tool with high form accuracy and low run-out. This paper describes a tool-making method for high precision grinding and the grinding performance of a self-electroplated tool. The ground surface textures, tool performance and tool life were investigated. A ground surface roughness Rz of 0.14 ㎛ was achieved. Our results show that the spindle speed, feed rate and cross feed affected the surface texture. One tool could finish 5000㎟ of die steel surface without any deterioration of the ground surface roughness.

High-Resolution Probe-Based Confocal Laser Endomicroscopy for Diagnosing Biliary Diseases

Hiroki Koda,Kazuo Hara,Okuno Nozomi,Takamichi Kuwahara,Mizuno Nobumasa,Shin Haba,Miyano Akira,Isomoto Hajime 대한소화기내시경학회 2021 Clinical Endoscopy Vol.54 No.6

Probe-based confocal laser endomicroscopy is an endoscopic technique that enables in vivo histological evaluation using fluorescentpigment. The ability to diagnostically differentiate between benign and malignant biliary disease using the “CholangioFlexTM”, adedicated biliary device, has been reported. However, the Miami and Paris classifications, used as diagnostic criteria, mainly evaluatefindings in the submucosa, and visualizing the epithelium as the main site of lesions remains difficult. To address this problem, weverified the imaging findings and diagnostic ability of three types of probes: CholangioFlexTM, GastroFlexTM, and AlveoFlexTM. WithGastroFlexTM, the clear mucosal epithelium was observed, and differential diagnoses as benign/malignant could be made based onepithelial findings. GastroFlexTM may be a good first-choice probe for probe-based confocal laser endomicroscopy of biliary diseases,and a new diagnostic classification based on bile duct epithelial findings may provide useful criteria independent of the Miami orParis classifications.

Outcomes of Endoscopic Ultrasound-Guided Biliary Drainage in Patients Undergoing Antithrombotic Therapy

Nozomi Okuno,Kazuo Hara,Nobumasa Mizuno,Shin Haba,Takamichi Kuwahara,Hiroki Koda,Masahiro Tajika,Tsutomu Tanaka,Sachiyo Onishi,Keisaku Yamada,Akira Miyano,Daiki Fumihara,Moaz Elshair 대한소화기내시경학회 2021 Clinical Endoscopy Vol.54 No.4

Background/Aims: The Japan Gastroenterological Endoscopy Society (JGES) has published guidelines for gastroenterologicalendoscopy in patients undergoing antithrombotic treatment. These guidelines classify endoscopic ultrasound-guided biliary drainage(EUS-BD) as a high-risk procedure. Nevertheless, the bleeding risk of EUS-BD in patients undergoing antithrombotic therapy isuncertain. Therefore, this study aimed to assess the bleeding risk in patients undergoing antithrombotic therapy. Methods: This single-center retrospective study included 220 consecutive patients who underwent EUS-BD between January 2013and December 2018. We managed the withdrawal and continuation of antithrombotic agents according to the JGES guidelines. Wecompared the bleeding event rates among patients who received and those who did not receive antithrombotic agents. Results: A total of 18 patients (8.1 %) received antithrombotic agents and 202 patients (91.8 %) did not. Three patients experiencedbleeding events, with an overall bleeding event rate of 1.3% (3/220): one patient was in the antithrombotic group (5.5%) and twopatients were in the non-antithrombotic group (0.9%) (p=0.10). All cases were moderate. The sole thromboembolic event (0.4%) wasa cerebral infarction in a patient in the non-antithrombotic group. Conclusions: The rate of EUS-BD-related bleeding events was low. Even in patients receiving antithrombotic therapy, the bleedingevent rates were not significantly different from those in patients not receiving antithrombotic therapy.

Endoscopic ultrasound-guided portal vein coiling: troubleshooting interventional endoscopic ultrasonography

Shin Haba,Kazuo Hara,Nobumasa Mizuno,Takamichi Kuwahara,Nozomi Okuno,Akira Miyano,Daiki Fumihara,Moaz Elshair 대한소화기내시경학회 2022 Clinical Endoscopy Vol.55 No.3

Endoscopic ultrasound (EUS)-guided hepaticogastrostomy (HGS) is widely performed not only as an alternative to transpapillary biliarydrainage, but also as primary drainage for malignant biliary obstruction. For anatomical reasons, this technique carries an unavoidablerisk of mispuncturing intrahepatic vessels. We report a technique for troubleshooting EUS-guided portal vein coiling to preventbleeding from the intrahepatic portal vein after mispuncture during interventional EUS. EUS-HGS was planned for a 59-year-old malepatient with unresectable pancreatic cancer. The dilated bile duct (lumen diameter, 2.8 mm) was punctured with a 19-gauge needle,and a guidewire was inserted. After bougie dilation, the guidewire was found to be inside the intrahepatic portal vein. Embolizing coilswere placed to prevent bleeding. Embolization coils were successfully inserted under stabilization of the catheter using a double-lumencannula with a guidewire. Following these procedures, the patient was asymptomatic. Computed tomography performed the next dayrevealed no complications.

Review : EUS-Guided Biliary Drainage

( Kenji Yamao ),( Kazuo Hara ),( Nobumasa Mizuno ),( Akira Sawaki ),( Susumu Hijioka ),( Yasumasa Niwa ),( Masahiro Tajika ),( Hiroki Kawai ),( Shinya Kondo ),( Yasuhiro Shimizu ),( Vikram Bhatia ) The Editorial Office of Gut and Liver 2010 Gut and Liver Vol.4 No.s1

Endoscopic ultrasonography (EUS) combines endoscopy and intraluminal ultrasonography, and allows imaging with a high-frequency transducer over a short distance to generate high-resolution ultrasonographic images. EUS is now a widely accepted modality for diagnosing pancreatobiliary diseases. EUS-guided fineneedle aspiration (EUS-FNA) using a curved linear- array echoendoscope was initially described more than 20 years ago, and since then many researchers have expanded its indications to sample diverse lesions and have also used it for various therapeutic purposes. EUS-guided biliary drainage (EUS-BD) is one of the therapeutic procedures that has been developed using a curved linear-array echoendoscope. Technically, EUS-BD includes rendezvous techniques via transesophageal, transgastric, and transduodenal routes, EUS-guided choledochoduodenostomy (EUS-CDS), and EUS-guided hepaticogastrostomy (EUS-HGS). Published data have demonstrated a high success rate, albeit with a comparatively high rate of nonfatal complications for EUS-CDS and EUS-HGS, and a comparatively low success rate with a low complication rate for the rendezvous technique. At present, these procedures represent an alternative to surgery or percutaneous transhepatic biliary drainage (PTBD) for patients with obstructive jaundice when endoscopic biliary drainage (EBD) has failed. However, these procedures should be performed in centers with extensive experience in linear EUS and therapeutic biliary ERCP. Large prospective studies are needed in the near future to establish standardized EUS-BD procedures as well as to perform controlled comparative trials between EUS-BD and PTBD, between rendezvous techniques and direct-access techniques (EUS-CDS and EUS-HGS), and between EBD and EUS-BD. (Gut Liver 2010;4(Suppl. 1):S67-75)