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Algorithm detecting low arousal states of car drivers based on the driver’s eye blinking pattern
Keisuke Suzuki,Kiichi Yamada,Yumie Minakami,Hiroyuki Kawamura 대한인간공학회 2010 대한인간공학회 학술대회논문집 Vol.2010 No.5
In this study, five kinds of state variables characterizing the eye blinking behavior for detecting low arousal level of car drivers were investigated. This investigation was carried out in a driving simulator for clarifying what kind of state variables are useful for designing the algorithm of awaking alarm, in terms of minimizing the missing alarms in low arousal condition and the excess alarms in awaking condition simultaneously. In applying the ratio regarding closing/opening time of eyelid and the variation of this ratio for designing the algorithm, the time frequency of the missing alarms was approximately 1.5 % and extremely lower than the conditions when the algorithm was based on the other state variables like the total time for eye closing or the opening rate of eyelid. The excess alarms in applying this algorithm are also lower than the other algorithms. An effectiveness of awaking alarm based on this algorithm was also evaluated and clarified that the awaking effects by the acoustic alarm evaluated in terms of the fluctuation of RRI (ECG) was not sufficient, and the methodology for awaking the driver should be studied.
Designing Methodologies of Human Machine Interface of Driving Support Systems
( Keisuke Suzuki ) 한국감성과학회 2015 추계학술대회 Vol.2015 No.-
The commercial utilization and spread of traffic-accident avoidance systems is steadily progressing. In this study, I will summarize our research projects with the aim of minimizing traffic accidents for the optimization of Human-Machine Interface (HMI) of the driving support devices. I will especially focus on the designing strategies of information presenting devices at intersections to minimize the risk of collisions which are highly ranked traffic accidents in Japan and Korea. First, I will discuss the designing methodologies of adaptive driving assistant system for elderly drivers. Some of the investigations to optimize the presentation of information based on the braking behavior at intersections and activation level of frontal cortex in terms of Oxy-Hb are discussed. Next, I will discuss the management method for traffic information using peripheral vision. Quantities of information presented on LCD display on the instrument panel for traffic safety are increasing rapidly. For minimizing the mis-understanding and increasing the level of Situation Awareness, usefulness of ambient information in peripheral area is discussed. Lastly, I will summarize the analysis method in terms of the collision mitigation level when utilizing driving support systems which were mentioned above. In addition to this analysis method, the cost and benefit analysis when utilizing the device is discussed. In this study, two different method, Monte-Carlo simulation and system reliability analysis using the database of driving behavior investigated in a driving simulator are discussed. In these simulation and analysis models, the total reliability including driver and system as a human-machine system is discussed.
Development of Seahorse Robot Capable of Expressing Happiness, Sadness and Anger
Keisuke Sayama,Yuki Suzuki,Hun-ok Lim 제어로봇시스템학회 2011 제어로봇시스템학회 국제학술대회 논문집 Vol.2011 No.10
This paper describes the mechanism and the control system of a seahorse robot that is able to express happiness, sadness and anger. MP motion sensors (Pyroelectric Motion Detection Sensor), force sensors, and color sensors are employed to express emotion. The seahorse robot consists of a base, a body and a head. It has 4 DOFs (2 DOFs in the head and 2 DOFs in the body) and it weighs 800 [g]. Emotion expression experiments are conducted to confirm the mechanism and the control system of the robot and are evaluated by ten subjects. After they watch the body color and motion), they select one of five emotions. The effectiveness of the mechanism and the control of the robot are verified through emotion experiments.
Mizuo, Keisuke,Narita, Minoru,Miyagawa, Kazuya,Suzuki, Tsutomu The Korean Society of Applied Pharmacology 2010 Biomolecules & Therapeutics(구 응용약물학회지) Vol.22 No.4
Bisphenol A (BPA) is one of the most common endocrine disrupters. In the last decade, the number of studies concerning the effects of chronic treatment with BPA on the development of the central nervous system (CNS) has increased. However, little is known about the effects of chronic exposure to BPA on higher brain functions such as memory or psychomotor functions. Here, we report our following findings: (1) Prenatal and neonatal exposure to BPA enhances psychostimulant-induced rewarding effects, results in the up- or downregulation of dopamine receptors, causes memory impairment, and decreases choline acetyltransferase (ChAT) activity. (2) BPA activates astrocytes in vivo and in vitro. These findings suggest that prenatal and neonatal exposure to BPA affects the development of the CNS.
( Toshiaki Suzuki ),( Reina Ohba ),( Ei Kataoka ),( Yui Kudo ),( Akira Zeniya ),( Daisuke Segawa ),( Keisuke Oikawa ),( Masaru Odashima ),( Taiji Saga ),( Tomoyuki Kuramitsu ),( Hideaki Sasahara ),( K 대한소화기기능성질환·운동학회 2022 Journal of Neurogastroenterology and Motility (JNM Vol.28 No.1
Background/Aims Gastric acid secretion is suspected to be a pivotal contributor to the pathogenesis of functional dyspepsia. The present study investigates the potential association of the gastric acid secretion estimated by measuring serum pepsinogen with therapeutic responsiveness to the prokinetic drug acotiamide. Methods Dyspeptic patients consulting participating clinics from October 2017 to March 2019 were prospectively enrolled in the study. The dyspeptic symptoms were classified into postprandial distress syndrome (PDS) and epigastric pain syndrome (EPS). Gastric acid secretion levels were estimated by the Helicobacter pylori infection status and serum pepsinogen using established criteria and classified into hypo-, normo-, and hyper-secretion. Each patient was then administered 100 mg acotiamide thrice daily for 4 weeks, and the response rate to the treatment was evaluated using the overall treatment efficacy scale. Results Of the 86 enrolled patients, 56 (65.1%) and 26 (30.2%) were classified into PDS and EPS, respectively. The estimated gastric acid secretion was not significantly different between PDS and EPS. The response rates were 66.0% for PDS and 73.1% for EPS, showing no significant difference. While the response rates were stable, ranging from 61.0% to 75.0% regardless of the estimated gastric acid secretion level among subjects with PDF, the rates were significantly lower in hyper-secretors than in non-hyper-secretors among subjects with EPS (42.0% vs 83.0%, P = 0.046). Conclusion Although acotiamide is effective for treating EPS as well as PDS overall, the efficacy is somewhat limited in EPS with gastric acid hypersecretion, with gastric acid suppressants, such as proton pump inhibitors, being more suitable. (J Neurogastroenterol Motil 2022;28:53-61)