Takuya Koizumi

ORCID: 0000-0003-3039-3733
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About
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Research Areas
  • Liver Disease Diagnosis and Treatment
  • Reconstructive Surgery and Microvascular Techniques
  • Speech Recognition and Synthesis
  • Liver Disease and Transplantation
  • Cardiac Arrhythmias and Treatments
  • Reconstructive Facial Surgery Techniques
  • Cardiac electrophysiology and arrhythmias
  • Hepatocellular Carcinoma Treatment and Prognosis
  • Cellular and Composite Structures
  • Cardiac pacing and defibrillation studies
  • Cleft Lip and Palate Research
  • Neural Networks and Applications
  • Speech and Audio Processing
  • Voice and Speech Disorders
  • Facial Trauma and Fracture Management
  • Diabetes Treatment and Management
  • Atrial Fibrillation Management and Outcomes
  • Metallurgical Processes and Thermodynamics
  • Facial Nerve Paralysis Treatment and Research
  • Pancreatic function and diabetes
  • Cardiac Imaging and Diagnostics
  • Robotics and Sensor-Based Localization
  • Cardiovascular Function and Risk Factors
  • Robotic Path Planning Algorithms
  • Advanced Thermoelectric Materials and Devices

Hokkaido University
1999-2024

Solutions Inc. (Japan)
2024

Gifu Prefectural General Medical Center
2022

Hokkaido University Hospital
2020-2022

YKK (Japan)
2011-2021

Nippon Medical School
2021

National Institute Of Technology, Ishikawa College
2020

National Institute of Technology
2020

Osaka University
1967-2019

Hakodate National Hospital
2019

We propose a design and fabrication process for fabrics containing thermoelectric generators (TEGs) in the form of carbon nanotube composite threads intended energy harvesting low-temperature waste heat.

10.1039/c7ta00304h article EN Journal of Materials Chemistry A 2017-01-01

Recent studies have demonstrated that sodium-glucose co-transporter-2 inhibitors (SGLT2-i) reduce the risk of atrial fibrillation (AF) in patients with diabetes mellitus (DM), which oxidative stress due to increased reactive oxygen species (ROS) contributes pathogenesis AF. We aimed further investigate this, and examine whether SGLT2-i empagliflozin suppresses mitochondrial-ROS generation mitigates fibrosis.A high-fat diet low-dose streptozotocin treatment were used induce type-2 DM (T2DM)...

10.3389/fcvm.2023.1005408 article EN cc-by Frontiers in Cardiovascular Medicine 2023-02-06

Diabetic cardiomyopathy has been reported to increase the risk of fatal ventricular arrhythmia. The beneficial effects selective sodium-glucose cotransporter-2 inhibitor have not fully examined in context antiarrhythmic therapy, especially its direct cardioprotective despite negligible SGLT2 expression cardiomyocytes. We aimed examine empagliflozin (EMPA) treatment on diabetic cardiomyocytes, with a special focus Ca2+ handling. conducted echocardiography and hemodynamic studies studied...

10.1152/ajpheart.00391.2022 article EN AJP Heart and Circulatory Physiology 2023-01-06

Metallic foams are commonly produced using hydride foaming agents. Carbonates safer to handle than hydrides; however, their use in the powder metallurgy (PM) route obtaining a fine and homogenous cell structure has not been evaluated. In this study, carbonates hydroxides were investigated as agents for production of Al-Si-Cu alloy by PM route. The thermal decomposition behavior was evaluated conjunction with aluminum produced. From results, it clarified that agent began decomposing after...

10.2320/matertrans.m2010401 article EN MATERIALS TRANSACTIONS 2011-01-01

Abstract Epicardial adipose tissue (EAT) is an active endocrine organ that closely associated with occurrence of atrial fibrillation (AF). However, the role EAT in development postoperative AF (POAF) remains unclear. We aimed to investigate association between profile and POAF patients who underwent cardiovascular surgery. obtained samples from 53 evaluate gene expression, histological changes, mitochondrial oxidative phosphorylation (OXPHOS) capacity EAT, protein secretion EAT‐conditioned...

10.14814/phy2.15957 article EN cc-by Physiological Reports 2024-03-01

We studied gastrointestinal motility in 20 infants, using a modified manometric method for neonates, and compared it to that adults. Changes the intragastric intraduodenal pressures were recorded 3 h after ingestion of milk. Bands contractions with same rhythmicity as phase III activity adults frequently recorded. Some them migrated caudally speculated be equivalent interdigestive migrating complex (IMC) However, others did not migrate showed some differences from infants time occurrence,...

10.1159/000242145 article EN Neonatology 1985-01-01

This paper presents development of a quad rotor tail-sitter VTOL UAV (Vertical Takeoff and Landing Unmanned Aerial Vehicle) which is composed four rotors fixed wing. The conventional UAVs have drawback in the accuracy attitude control stationary hovering because they were developed based on fixed-wing aircraft used surfaces, such as aileron, elevator, rudder for control. To overcome drawback, we UAV. realizes high with like helicopter achieves level flight airplane. remarkable characteristic...

10.1109/icra.2013.6630594 article EN 2013-05-01

Background Low‐voltage areas in the left atrium predict atrial fibrillation recurrence after catheter ablation and are associated with adverse outcomes like death, heart failure, stroke. Detecting low‐voltage (LVAs) typically requires invasive procedures, highlighting need for a simple, minimally marker. Vasoactive intestinal peptide (VIP), neuropeptide released during parasympathetic stimulation, affects electrophysiological remodeling fibrillation. We hypothesized that serum VIP could...

10.1161/jaha.124.039192 article EN cc-by-nc-nd Journal of the American Heart Association 2025-03-21

The cephalic index is a method of assessing skull morphology in craniosynostosis. There are known racial differences; however, there few reports on this Japan. In study, we investigated the indices Japanese children with normal brain development using axial slice computed tomography. Children presented to our institution because head injuries but received no particular diagnosis. One hundred four (62 males and 42 females) were divided into 7 age categories, namely, 4 categories for those...

10.1097/scs.0b013e3181ecc2f3 article EN Journal of Craniofacial Surgery 2010-09-01

It is known that breast milk empties more quickly from the stomach than does infant formula. We studied difference in gastroduodenal motility between neonates fed with human and those Twenty-four five-to 36-day-old were mother's or a cow's milk-based Postprandlial contractions recorded manometrically for three hours. Repetitive, high-amplitude nonmigrating dominant wave form during postprandial period. The number of episodes, duration, amplitude, frequency not different following feedings....

10.1542/peds.80.3.434 article EN PEDIATRICS 1987-09-01

Three new two-mass models of the vocal cords are treated. First, features, structure, and differential equations motion described for each compared with those previous models. Second, performances discussed in terms glottal volume flow, area, radiated sound pressure, trajectories mass movement, running spectra output perceptual naturalness sound. Finally, major effects source-vocal tract interaction including skewing, truncation, superposition investigated, using one simplest types two load...

10.1121/1.395254 article EN The Journal of the Acoustical Society of America 1987-10-01

Reconstruction using flaps with good blood circulation is appropriate for covering an intractable ulcer or a fistula in which tendon bones are exposed. A non-vascularised perifascial areolar tissue (PAT) graft can also survive such area. This study reports the versatile application of PAT use as material. total 32 patients were treated between April 2004 and December 2010 (16 men 16 women). The donor sites inguinal region 20, thigh 11, subclavian one. There 13 inlay grafts to dead space...

10.3109/2000656x.2012.759955 article EN Journal of Plastic Surgery and Hand Surgery 2013-05-28

Multiple-suture synostosis is a rare condition among patients with craniosynostosis. Their cranial shapes demonstrate various types depending on the fused sutures, and it tends to be less consistent in comparison single-suture synostosis. The details regarding surgical intervention for multiple-suture have rarely been documented. This report presents 4 nonsyndromic who were incidentally diagnosed as school-aged children. age at time of surgery ranged from 7 11 years. All demonstrated digital...

10.1097/scs.0b013e31819b9845 article EN Journal of Craniofacial Surgery 2009-03-01

Metallic foams are commonly produced using titanium hydride as a foaming agent. Carbonates produce aluminum foam with fine and homogenous cell structure. However, carbonates show marked shrinkage, which is clearly different from those hydride. It essential for practical applications to clarify shrinkage establish method of preventing it. In this research, structures were observed study the carbonates. The cells dolomite agent connected each other maximum expansion. was estimated that gas...

10.3390/met2010001 article EN cc-by Metals 2011-12-23

Sir: The treatment of skin ulcers and fistulas with poor blood circulation associated tendon bone exposure1,2 is frequently difficult. Various distant flaps free are used for treatment; however, Kouraba et al. have recently advocated the use perifascial areolar tissue as a graft material, which survives on such areas.3–5 Perifascial loose connective deep fascias has an abundant vascular plexus. This study reports utility minimally invasive surgical material accompanied by or exposure....

10.1097/prs.0b013e3181ea91e3 article EN Plastic & Reconstructive Surgery 2010-10-01

Portosystemic shunting was evaluated with rectal administration of iodine-123 iodoamphetamine (IMP) in seven patients without liver disease and 53 cirrhosis. IMP (2-3 mCi [74-111 MBq]) administered to the rectum through a catheter. Images chest abdomen were obtained for up 60 minutes scintillation camera interfaced computer. In all patients, images and/or lungs observed within 5-10 became clear time. disease, only could be obtained, whereas lung visualized or The portosystemic shunt index...

10.1148/radiology.169.1.3420249 article EN Radiology 1988-10-01

This paper deals with recurrent neural networks of multilayer perceptron type which are well-suited for speech recognition, specially phoneme recognition. The ability these has been investigated by recognition experiments using a number Japanese words uttered native male speaker in quiet environment. Results the show that rates achieved higher than those obtained conventional non-recurrent networks.

10.1109/icslp.1996.607119 article EN 2002-12-24

The problem of glottal source–vocal tract interaction is treated. effect the first formant load on waveform volume flow investigated by solving a nonlinear differential equation which describes variation pressure drop across load. calculated under influence supraglottal and subglottal loads. estimation area function discussed as an application theory developed.

10.1121/1.392789 article EN The Journal of the Acoustical Society of America 1985-11-01

Recent developments in metal foams, especially aluminum, have produced a new class of lightweight materials at the side traditional ones such as polymers, ceramics or glass. The combination metallic character together with cellular structure gives an interesting potential for wide application this material, particularly high volume markets automotive industry. Increased demands concerning cost economy, passenger safety automobiles and recycling all bring constructors now to use foams. Hereby...

10.4144/rpsj.60.5 article EN Resources Processing 2013-01-01
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