Search results for: H. Kawanaka

Items from 1 to 20 out of 58 results

chapter

A Hardware Implementation of PRAM and its Performance Evaluation

M. Imai, Y. Hayakawa, H. Kawanaka, W. Chen, more

Lecture Notes in Computer Science > Parallel and Distributed Processing > 143-148

A PRAM (Parallel Random Access Machine) [4] is the parallel computational model most notable for supporting the parallel algorithmic theory. It consists of a number of processors sharing a common memory. The processors communicate by exchanging data through a shared memory cell. Each processor can access any memory cell at one unit of time and all processors operate synchronously under the control...

chapter

Quantitative Assessment of Left Ventricular Myocardial Motion Using Shape-Constraint Elastic Link Model

Y. Maeda, W. Ohyama, H. Kawanaka, S. Tsuruoka, more

IFMBE Proceedings > 13th International Conference on Biomedical Engineering > Clinical Engineering; Telemedicine & Healthcare; Computer-Assisted Surgery; Medical Robotics; Rehabilitation Engineering & Assistive Technology > 1102-1106

We propose a novel technique to track the motion of the left ventricular myocardium on a sequence of transthoracic two-dimensional echocardiogram. Although the proposed method is generally based on the traditional correlation based motion tracking, the tracking accuracy and stability are improved by the introduction of new objective function. In our method, the objective function is defined from the...

article

Prognostic Impact of Des-γ-carboxyl Prothrombin in Living-Donor Liver Transplantation for Recurrent Hepatocellular Carcinoma

N. Harimoto, Y. Yoshida, T. Kurihara, K. Takeishi, more

Transplantation Proceedings > 2015 > 47 > 3 > 703-704

Although the Milan criteria are widely accepted for liver transplantation (LT) in patients for hepatocellular carcinoma (HCC), they have not been fully evaluated for salvage LT in patients with recurrent HCC. We have previously reported outcomes of living-donor LT (LDLT) for HCC and identified 2 risk factors affecting recurrence-free survival (RFS): tumor size >5 cm and des-γ-carboxyl prothrombin...

article

Triple Therapy Using Direct-Acting Agents for Recurrent Hepatitis C After Liver Transplantation: A Single-Center Experience

T. Ikegami, T. Yoshizumi, Y. Soejima, N. Harimoto, more

Transplantation Proceedings > 2015 > 47 > 3 > 730-732

Hepatitis C viral graft reinfection is almost a universal event after liver transplantation with consequent disease progression.We applied triple therapy (n = 21) with the use of telaprevir (TVR; n = 12) or simeprevir (SVR; n = 9).TVR was given at the dose 1,500 mg daily (n = 11) with reduced dose of cyclosporine at 25% to 50%, and SVR was given at the dose 100 mg daily with unadjusted cyclosporine,...

article

Impact of Platelets and Serotonin on Liver Regeneration After Living Donor Hepatectomy

T. Yoshizumi, S. Itoh, D. Imai, T. Ikegami, more

Transplantation Proceedings > 2015 > 47 > 3 > 683-685

Several animal models have revealed that platelet-derived serotonin initiates liver regeneration after hepatectomy. However, there are few reports regarding the effects of serotonin in the clinical setting. The aim of this study was to explore the impact of serotonin and platelets in the early phase after healthy living donor hepatectomy.Stored samples from 34 living donors who received left lobectomy...

article

Effect of laparoscopic splenectomy on portal haemodynamics in patients with liver cirrhosis and portal hypertension

H. Kawanaka, T. Akahoshi, N. Kinjo, T. Iguchi, more

British Journal of Surgery > 101 > 12 > 1585 - 1593

BackgroundThe effect of splenomegaly in patients with liver cirrhosis and portal hypertension is not fully understood. This study was designed to determine the effect of laparoscopic splenectomy on portal haemodynamics in these patients. MethodsPatients with liver cirrhosis and portal hypertension who underwent laparoscopic splenectomy in Kyushu University Hospital from January 2006 to March 2009...

article

Characteristics of splenic CD8⁺ T cell exhaustion in patients with hepatitis C

K. Sumida, S. Shimoda, S. Iwasaka, S. Hisamoto, more

Clinical & Experimental Immunology > 174 > 1 > 172 - 178

There is increasing interest in the role of T cell exhaustion and it is well known that the natural history of chronic hepatitis C virus infection (HCV) is modulated by CD8⁺T cell immunobiology. There are many pathways that alter the presence of exhaustive T cells and, in particular, they are functionally impaired by inhibitory receptors, such as programmed death‐1 (PD‐1) and T cell immunoglobulin...

article

Modulation of CD4⁺ T cell responses following splenectomy in hepatitis C virus‐related liver cirrhosis

N. Hashimoto, S. Shimoda, H. Kawanaka, K. Tsuneyama, more

Clinical & Experimental Immunology > 165 > 2 > 243 - 250

Dysfunction of T cells is a common feature in chronic persistent viral infections, including hepatitis C virus (HCV), and although hepatic and peripheral T cells have been studied extensively in chronic HCV hepatitis, the role of splenic T cell responses in such patients is poorly defined. This is an important issue, as thrombocytopenia is a complication of HCV‐related liver cirrhosis (LC), due to...

article

Electrical- and magneto-resistance control for magnetite nanoparticle sinter by regulation of heat treatment temperature

H. Kobori, T. Asahi, A. Yamasaki, A. Sugimura, more

Journal of Magnetism and Magnetic Materials > 2011 > 323 > 6 > 686-690

We investigated electrical- and magneto-resistance control in magnetite (Fe ₃ O ₄ ) nanoparticle sinter (MNPS) by the regulation of heat treatment (HT) temperature. MNPS was produced from hematite (α-Fe ₂ O ₃ ) nanoparticles (HNP’s) using a deoxidization reaction. The average size of HNP was 30nm, and HT was carried out between 400 and 800°C. X-ray diffraction, magnetization,...

chapter

Personal Dictionaries for Handwritten Character Recognition Using Characters Written by a Similar Writer

S Tsuruoka, M Hattori, Mohd Fadzil bin Abdul Kadir, T Takano, more

2010 12th International Conference on Frontiers in Handwriting Recognition > 599 - 604

2010 12th International Conference on Frontiers in Handwriting Recognition (ICFHR 2010)

We propose two new generation methods of personal dictionary for handwritten character recognition using the set of characters written by a similar writer. The methods employ only one character written by one specific writer, and its character selects the set of characters written by the similar writer to generate the personal dictionary for the specific writer. The first type (similar mean) dictionary...

chapter

A proposal of 3D analytical method for designing a comfortable grip form

H Kawanaka, K Yamamoto, K Takahashi, K Suzuki

2010 16th International Conference on Virtual Systems and Multimedia > 267 - 273

2010 16th International Conference on Virtual Systems and Multimedia (VSMM 2010)

Gripping is a very important function in daily life and there will be a best form for gripping for each person. If the form is best, then it will contain some information about the physical and mental condition of the person, and there might be some common mathematical formulas by which we can describe the best form to each person. Such concept as to best fit everybody may be the concept of universal...

chapter

Effect of pattern recognition features on detection for driver's cognitive distraction

M Miyaji, H Kawanaka, K Oguri

13th International IEEE Conference on Intelligent Transportation Systems > 605 - 610

2010 13th International IEEE Conference on Intelligent Transportation Systems (ITSC 2010)

Constituent technology of a driver monitor system using information of a driver's psychosomatic states is expected to create driver's states adaptive drive supporting system for the reduction of traffic accidents. In this study we identified a driver's distraction as one of major psychosomatic states which may result in a traffic accident by using Internet based survey on a questionnaire basis. Then...

article

Risk factors for portal venous thrombosis after splenectomy in patients with cirrhosis and portal hypertension

N. Kinjo, H. Kawanaka, T. Akahoshi, M. Tomikawa, more

British Journal of Surgery > 97 > 6 > 910 - 916

Background:Portal venous thrombosis (PVT) is a potentially fatal complication following splenectomy. Its mechanisms and risk factors are poorly understood, especially in patients with cirrhosis and portal hypertension. This study investigated risk factors for PVT following splenectomy in such patients. Methods:All consecutive patients with cirrhosis who underwent splenectomy in Kyushu University...

article

Enhancement of negative magnetoresistance due to weak localization in In2O3 thin films on Si substrate

A. Fujimoto, M. Kitamura, H. Kobori, A. Yamasaki, more

Physica E: Low-dimensional Systems and Nanostructures > 2010 > 42 > 4 > 1134-1137

The structural and electrical properties of In2O3 films on Si (100) single crystal and a-SiO2 glass substrates grown by RF-magnetron sputtering method were investigated. As the results of X-ray diffraction spectra and atomic force microscope images of the films, we found that In2O3 film on Si has better crystalline quality than that on a-SiO2. Negative magnetoresistance (MR) caused by weak localization...

chapter

Study on effect of adding pupil diameter as recognition features for driver's cognitive distraction detection

M Miyaji, H Kawanaka, K Oguri

2010 7th International Symposium on Communication Systems, Networks&Digital Signal Processing (CSNDSP 2010) > 406 - 411

2010 7th International Symposium on Communication Systems, Networks & Digital Signal Processing (CSNDSP 2010)

Driver states adaptive drive supporting system is highly expected in use for the reduction of the number of traffic accidents. This study aimed at creating a constituent technology for detecting driver's cognitive distraction, which may be one of major factors of driver's psychosomatic states just before a traffic accident. We reproduced driver's cognitive distraction by means of imposing cognitive...

chapter

Automated updating of camera parameters for user-friendly driver monitoring system

T. Hirata, M. Danno, M. Miyaji, H. Kawanaka, more

2009 IEEE International Conference on Vehicular Electronics and Safety (ICVES) > 91 - 96

2009 IEEE International Conference on Vehicular Electronics and Safety (ICVES 2009)

This paper points to a component technology of driver monitoring system which has not been explored yet, namely, automated camera calibration. It proposes that the calibration should not be left to be done manually, as is the case now, but should be automated. In particular, this paper describes an algorithm to automatically update the camera parameters of the in-vehicle driver monitoring camera system...

chapter

Multi-class identification of driver's cognitive distraction with error-correcting output coding (ECOC) method

A. Nagase, H. Kawanaka, M.S. Bhuiyan, K. Oguri

2009 12th International IEEE Conference on Intelligent Transportation Systems > 1 - 6

2009 12th International IEEE Conference on Intelligent Transportation Systems (ITSC)

Human cognitive state monitoring is quite important for active safety which is a technology to prevent accidents. While driving, cognitive distraction like conversation or thoughts unrelated to driving has potential hazards. Identification of cognitive distraction has already been reported in literature. However, multi-class identification of cognitive distraction has yet to be reported. This paper...

chapter

Driver's cognitive distraction detection using physiological features by the adaboost

M. Miyaji, H. Kawanaka, K. Oguri

2009 12th International IEEE Conference on Intelligent Transportation Systems > 1 - 6

2009 12th International IEEE Conference on Intelligent Transportation Systems (ITSC)

Effects of driver's states adaptive driving support systems is highly expected for the prevention of traffic accidents. In order to create this constituent technology, detecting driver's psychosomatic states which occurs just before a traffic accident is essential. Therefore driver's distraction is thought as one of important factors. This study focused on detecting driver's cognitive distraction,...

chapter

Obstacle to training SpikeProp networks — Cause of surges in training process —

H. Takase, M. Fujita, H. Kawanaka, S. Tsuruoka, more

2009 International Joint Conference on Neural Networks > 3062 - 3066

2009 International Joint Conference on Neural Networks (IJCNN 2009 - Atlanta)

In this paper, we discuss an obstacle to training in SpikeProp, which is a type of supervised learning algorithms for spiking neural networks. In the original publication of SpikeProp, weights with mixed signs are suspected to cause failures of training. We pointed out the cause of it through some experiments. Weights with mixed signs make the dynamics of the unit's activity twisted, and the twisted...

article

QS21. Laparoscopic Splenectomy as a Breakthrough of Completion of Peginterferon and Ribavirin Therapy in Patients With HCV Cirrhosis and Hypersplenism

T. Akahoshi, H. Kawanaka, M. Tomikawa, N. Kinjo, more

Journal of Surgical Research > 2009 > 151 > 2 > 283

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INFONA - science communication portal

Search results for: H. Kawanaka

A Hardware Implementation of PRAM and its Performance Evaluation

Quantitative Assessment of Left Ventricular Myocardial Motion Using Shape-Constraint Elastic Link Model

Prognostic Impact of Des-γ-carboxyl Prothrombin in Living-Donor Liver Transplantation for Recurrent Hepatocellular Carcinoma

Triple Therapy Using Direct-Acting Agents for Recurrent Hepatitis C After Liver Transplantation: A Single-Center Experience

Impact of Platelets and Serotonin on Liver Regeneration After Living Donor Hepatectomy

Effect of laparoscopic splenectomy on portal haemodynamics in patients with liver cirrhosis and portal hypertension

Characteristics of splenic CD8⁺ T cell exhaustion in patients with hepatitis C

Modulation of CD4⁺ T cell responses following splenectomy in hepatitis C virus‐related liver cirrhosis

Electrical- and magneto-resistance control for magnetite nanoparticle sinter by regulation of heat treatment temperature

Personal Dictionaries for Handwritten Character Recognition Using Characters Written by a Similar Writer

A proposal of 3D analytical method for designing a comfortable grip form

Effect of pattern recognition features on detection for driver's cognitive distraction

Risk factors for portal venous thrombosis after splenectomy in patients with cirrhosis and portal hypertension

Enhancement of negative magnetoresistance due to weak localization in In2O3 thin films on Si substrate

Study on effect of adding pupil diameter as recognition features for driver's cognitive distraction detection

Automated updating of camera parameters for user-friendly driver monitoring system

Multi-class identification of driver's cognitive distraction with error-correcting output coding (ECOC) method

Driver's cognitive distraction detection using physiological features by the adaboost

Obstacle to training SpikeProp networks — Cause of surges in training process —

QS21. Laparoscopic Splenectomy as a Breakthrough of Completion of Peginterferon and Ribavirin Therapy in Patients With HCV Cirrhosis and Hypersplenism

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