Yosuke Kurihara
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View article: Numerical Integration Error in Linear Ordinary Differential Equations—Characteristic Root Distortion by Integration
Numerical Integration Error in Linear Ordinary Differential Equations—Characteristic Root Distortion by Integration Open
Obtaining solutions to large-scale linear ordinary differential equations (ODEs) inevitably relies on numerical integration methods that have developed in various contexts to ultimately approximate the differentiation of continuous-time va…
View article: Unified Framework for Evaluating Numerical Integration Methods Through Characteristic Root Distortion in Linear Ordinary Differential Equations
Unified Framework for Evaluating Numerical Integration Methods Through Characteristic Root Distortion in Linear Ordinary Differential Equations Open
Analytically solving complex or large-scale differential equations is often difficult or even impossible, making numerical integration methods indispensable. However, as all numerical integration methods approximate a continuous-time equat…
View article: Energy-Harvesting System and Transfer Matrix Model for Pressure Regulators
Energy-Harvesting System and Transfer Matrix Model for Pressure Regulators Open
This study is focused on energy harvesting. The goal was to develop a new energy-harvesting system using a pressure regulator and establish an efficient energy flow model within it. The harvested electrical energy can be used as a power so…
View article: Handy Kitchen Liquid Food Viscometer Using a DC Motor as Actuator and Sensor
Handy Kitchen Liquid Food Viscometer Using a DC Motor as Actuator and Sensor Open
Liquid food can likely cause accidental ingestion in patients with dysphagia. This study proposes a handheld stirrer-type rotational viscometer that can be used in the kitchen or at meals for dysphagia. A novel rotational viscometer is pro…
View article: Using Granger Causal Test Associated with Trait Anxiety to Estimate STAI Scores by Constructing a Brain Activity Interdependence Network
Using Granger Causal Test Associated with Trait Anxiety to Estimate STAI Scores by Constructing a Brain Activity Interdependence Network Open
In recent years, many stress-related health problems have been reported, and an estimated 50% of suicide victims suffered from mental disorders. The State-Trait Anxiety Inventory (STAI), which measures trait and state anxieties, is one of …
View article: Method for Estimating Gaensler's Forced Expiratory Volume in One Second Percent Using a Built-in Stethoscope for Diagnosing Chronic Obstructive Pulmonary Disease
Method for Estimating Gaensler's Forced Expiratory Volume in One Second Percent Using a Built-in Stethoscope for Diagnosing Chronic Obstructive Pulmonary Disease Open
Respiratory disorders such as chronic obstructive pulmonary disease (COPD) have received significant attention. COPD diagnosis is processed by measuring the expiratory flow rate through pulmonary function test called spirometry, with Gaens…
View article: Proposal of FIM Value Estimation Method with Emphasis on Low Frequency using Mel Spectrum
Proposal of FIM Value Estimation Method with Emphasis on Low Frequency using Mel Spectrum Open
Long-term rehabilitation is necessary to restore motor function that has declined due to a tickle. The functional independence measure (FIM) is used as an index for the recovery of motor function. In this study, we propose a method to auto…
View article: Evaluation of colour space effect on estimation accuracy of hyperspectral image by dimension extension based on RGB image
Evaluation of colour space effect on estimation accuracy of hyperspectral image by dimension extension based on RGB image Open
Recently, the utilization of hyperspectral images containing several hundred wavelength information has been increasing in various fields. If a hyperspectral image can be estimated from a low-cost RGB image that has only R, G, and B wavele…
View article: Optimal Parameter Determination in Trunk Control Articulated Model by Applying Sequential Genetic Algorithm for mFIM Estimation
Optimal Parameter Determination in Trunk Control Articulated Model by Applying Sequential Genetic Algorithm for mFIM Estimation Open
Long-term rehabilitation is required to restore motor function, which is reduced because of stroke. The functional independence assessment method (FIM), which is an evaluation of daily life movements by caregivers, was adopted as an index …
View article: Proposal of Features and Denoising Method Considering Time Variation and Local Characteristics of Cerebral Blood Flow
Proposal of Features and Denoising Method Considering Time Variation and Local Characteristics of Cerebral Blood Flow Open
This research proposed a model of cerebral blood flow responses due to work in a work environment. Based on the model, features were proposed to capture the temporal changes and localization of cerebral blood flows, focusing on the periodi…
View article: Gaensler's Forced Expiratory Volume in One-Second Percent Estimating Method by Unconstrained Bed-Type Sensing Device for Diagnosing Chronic Obstructive Pulmonary Disease
Gaensler's Forced Expiratory Volume in One-Second Percent Estimating Method by Unconstrained Bed-Type Sensing Device for Diagnosing Chronic Obstructive Pulmonary Disease Open
Recently, respiratory disorders such as chronic obstructive pulmonary disease (COPD) have been garnering attention. COPD diagnosis is achieved by measuring expiratory flow rate via spirometry, with the Gaensler's forced expiratory volume i…
View article: Estimation of Functional Independence Measure Motor Score Based on a Trunk Control Model
Estimation of Functional Independence Measure Motor Score Based on a Trunk Control Model Open
The functional independence measure (FIM) is a metric of activities of daily living in stroke patients, but its accurate assessment requires experienced nurses. Therefore, we propose a system for estimating FIM scores easily at home based …
View article: Classification of Unconstrained Respiratory States Utilising Multidimensional Probability Distribution Based on Respiratory Frequency Information at Each Time Step
Classification of Unconstrained Respiratory States Utilising Multidimensional Probability Distribution Based on Respiratory Frequency Information at Each Time Step Open
In this study, an unconstrained respiratory state classification system is proposed at each time step to detect the symptoms of sleep apnoea. An air mattress-type pressure sensor was developed to unconstrainedly measure the respiration sig…
View article: Evolution of the primate glutamate taste sensor from a nucleotide sensor
Evolution of the primate glutamate taste sensor from a nucleotide sensor Open
(Current Biology 31, 4641–4649.e1–e5; October 25, 2021) In the originally published version of Figure 3A, amino acids at the T1R1 key sites of the three nonprimate mammals (horse, cat, and pig) were erroneously swapped. This error does not…
View article: Development of a Bed-Based Unconstrained Cardiac Auscultation Method
Development of a Bed-Based Unconstrained Cardiac Auscultation Method Open
In this letter, we propose a bed-based unconstrained cardiac auscultation method to obtain heart sounds while a person is lying on a bed. In the proposed method, a sensing device with a resonance frequency in the frequency range of heart s…
View article: Predicting the bladder urinary volume with a reabsorbed primitive urine model
Predicting the bladder urinary volume with a reabsorbed primitive urine model Open
With the rapid aging of the population, urination management is one of the challenges experienced in nursing homes. Although constrained devices, such as ultrasonic sensors, have been used for urination management, and they can sequentiall…
View article: Functional Independence Measure Motor Score Estimation Method Considering Instability of Movement
Functional Independence Measure Motor Score Estimation Method Considering Instability of Movement Open
In Japan, stroke is the second leading cause of long-term care. Therefore, patients with stroke need long-term rehabilitation. The Functional Independence Measure (FIM) is a measure of activities of daily living in stroke patients, which i…
View article: Unconstrained Respiration States Classification by Detecting Respiratory Cycle Using Autocorrelation
Unconstrained Respiration States Classification by Detecting Respiratory Cycle Using Autocorrelation Open
Daily sleep monitoring is necessary to make potential patients with sleep apnea syndrome aware of their respiration state during sleep. Although it is desirable to have an unconstrained system for daily monitoring in a home environment, th…
View article: Simultaneous Determination of Theatrical Casting and Ticket Distribution Using Scheduling Auction
Simultaneous Determination of Theatrical Casting and Ticket Distribution Using Scheduling Auction Open
The value or social surplus created by a theatrical drama is determined by the content of the drama, such as the cast, and ticket prices. The desirable cast and suitable ticket price depend on the preferences of the customers; however, in …
View article: Island-wide Distribution of Japanese Macaques in Yakushima Revealed by Census Targeting Feces on Roads in 2017-2018
Island-wide Distribution of Japanese Macaques in Yakushima Revealed by Census Targeting Feces on Roads in 2017-2018 Open
We studied the island-wide distribution of wild Japanese macaques in Yakushima (Macaca fuscata yakui) in May 2017 and 2018. We walked 165.4 km along roads and recorded the location of 842 macaque feces. We divided the roads into segments 5…
View article: Model of Urine Accumulation in the Bladder and Method for Predicting Unconstrained Urine Volume Based on Absorption Spectrum of Urine
Model of Urine Accumulation in the Bladder and Method for Predicting Unconstrained Urine Volume Based on Absorption Spectrum of Urine Open
As part of their excretion care protocol, many of the senior citizens living in nursing homes are required to wear a diaper for urinary incontinence. However, the diaper must be changed by the caregiver after each incontinence episode, and…
View article: Classification System for Golf Ball Initial Conditions using CNN Based on High-Time Resolution Images
Classification System for Golf Ball Initial Conditions using CNN Based on High-Time Resolution Images Open
To accurately estimate the trajectory of a golf ball after a swing impact, the initial conditions—i.e., initial velocity, angle, and backspin—need to be considered. In this paper, we propose an estimation system that can classify these ini…
View article: AFTER FALL MOTION DISCRIMINATION SYSTEM USING AUTOENCODER
AFTER FALL MOTION DISCRIMINATION SYSTEM USING AUTOENCODER Open
With the increase in world?s older population, the cases of fall accidents among the elderly has increased, with 32% - 42% of the annual fall accidents from people aged 70 years and older. Because the impact of falls can cause some serious…
View article: Data and codes of "Behavioral responses of Japanese macaques to playback-simulated intergroup encounters"
Data and codes of "Behavioral responses of Japanese macaques to playback-simulated intergroup encounters" Open
(1) "data_coo.csv": data on coo calling(2) "data_vs.csv": data on visual scanning(3) "data_prox.csv": data on the maximum number of group members within sight (a measure of the group cohesion)(4) "code_coo.stan"…
View article: Discrimination of Verbal/Visuospatial Memory Retrieval Processes by Measuring Prefrontal Lobe Blood Volume With Functional Near-Infrared Spectrometry
Discrimination of Verbal/Visuospatial Memory Retrieval Processes by Measuring Prefrontal Lobe Blood Volume With Functional Near-Infrared Spectrometry Open
In cognitive task execution, retrieval processes transfer memories from long-term storage to working memory, comprising three short-term memories-phonological loop, visuospatial sketchpad, and episodic buffer-controlled by a short-term-mem…
View article: UNCONSTRAINED CARDIAC SOUND MEASUREMENT METHOD UTILIZING A PNEUMATIC SENSING METHOD
UNCONSTRAINED CARDIAC SOUND MEASUREMENT METHOD UTILIZING A PNEUMATIC SENSING METHOD Open
Diagnoses based on the cardiac sound by auscultation that require doctors to obtain cardiac sound in front of a patient is the de facto standard at medical institutions.From the viewpoint of home health management, the burden of the daily …
View article: DEVELOPMENT OF ONE SENSOR MULTI-PHYSICAL QUANTITIES SENSING DEVICE BASED ON PIEZOELECTRIC FILM -APPLICATION TO DETECTING OF SECURITY EVENTS-
DEVELOPMENT OF ONE SENSOR MULTI-PHYSICAL QUANTITIES SENSING DEVICE BASED ON PIEZOELECTRIC FILM -APPLICATION TO DETECTING OF SECURITY EVENTS- Open
Generally, a sensor is specialized to measure a targeted physical quantity. Hence, to measure multi-physical quantities, the same numbers of types of sensors as physical quantities to be measured are required. However, applying plural type…
View article: AUTOMATIC CONTROL OF A ROOM VENTILATION SYSTEM BY A SINGLE FAN ACTUATOR
AUTOMATIC CONTROL OF A ROOM VENTILATION SYSTEM BY A SINGLE FAN ACTUATOR Open
Ventilation with a combination of active aeration fans and passive openings is essential for keeping rooms in houses comfortable. However, excessive use of an exhaust fan may prevent doors from being opened because of decreasing pressure i…
View article: CONSUMER PURCHASING BEHAVIOR ANALYSIS USING CVS POS DATA
CONSUMER PURCHASING BEHAVIOR ANALYSIS USING CVS POS DATA Open
In this study, the purchase behavior of customers is analyzed using the purchase history data of convenience stores for one year. Therefore, considering the number of visits to the store, the purchase price, and personal attributes, we use…
View article: OPTIMIZATION OF AN INFORMATION DIFFUSION MODEL OF INFLUENCER MARKETING -EVALUATION OF SPEED- AND COST-ORIENTED MARKETING BASED ON INFLUENCER-MARKET ELASTICITY-
OPTIMIZATION OF AN INFORMATION DIFFUSION MODEL OF INFLUENCER MARKETING -EVALUATION OF SPEED- AND COST-ORIENTED MARKETING BASED ON INFLUENCER-MARKET ELASTICITY- Open
Owing to its high degree of credibility, influencer marketing is incorporated into the advertising activities of many companies.However, it is often unclear for the company which market initiator (defined as the consumer to whom a company …