Yuki Sakai

ORCID: 0000-0003-4874-7755
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About
Contact & Profiles
Research Areas
  • Seismic Performance and Analysis
  • Earthquake and Disaster Impact Studies
  • Earthquake and Tsunami Effects
  • Structural Health Monitoring Techniques
  • Synthesis of Organic Compounds
  • Seismology and Earthquake Studies
  • Urban and spatial planning
  • Synthesis and Biological Activity
  • Synthesis and Reactions of Organic Compounds
  • Fluorine in Organic Chemistry
  • Structural Engineering and Vibration Analysis
  • Organic and Inorganic Chemical Reactions
  • Wind and Air Flow Studies
  • Luminescence and Fluorescent Materials
  • Oxidative Organic Chemistry Reactions
  • Image Retrieval and Classification Techniques
  • Color perception and design
  • Advanced Image and Video Retrieval Techniques
  • Gaze Tracking and Assistive Technology
  • earthquake and tectonic studies
  • Visual perception and processing mechanisms
  • Helicobacter pylori-related gastroenterology studies
  • Smart Agriculture and AI
  • Polyoxometalates: Synthesis and Applications
  • Radical Photochemical Reactions

Kyoto University
2012-2025

Kyoto Katsura Hospital
2023-2025

Hamamatsu University School of Medicine
2024

Prevention Institute
2021-2024

Brain (Germany)
2023-2024

Yokohama University of Pharmacy
1960-2023

Shimizu (Japan)
2018-2023

Utsunomiya University
2022

Kyushu Institute of Technology
2009-2022

Hosei University
2022

In recent years, Ambient Intelligence (AmI) has attracted increased attention within the advanced technology industry in an effort to modernize and develop a more intelligent reliable information system. Technologies detect specific object images are expected further expand wide range of applications, such as car detection functions for transport system other systems. Computer vision pattern recognition emerging fast will continue grow together with local feature methods. this paper, we used...

10.1109/imis.2016.84 article EN 2016-07-01

In recent years, Ambient Intelligence (AmI) has attracted increased attention within the advanced technology industry in an effort to modernize and develop a more intelligent reliable information system. Technologies detect specific object images are expected further expand wide range of applications, such as car detection functions for Intelligent Transport System (ITS) other systems. Computer vision pattern recognition emerging fast will continue grow together with local feature methods....

10.1109/nbis.2015.121 article EN 2015-09-01

Abstract Novel luminescent dialdiminate complexes of the Group 13 elements were prepared to evaluate effects central element on their properties. We demonstrate that absorption wavelength and response Lewis bases apparently depend atom. The aluminum complex exhibited band in higher‐energy region than gallium indium congeners. Theoretical calculations suggest has a lower‐lying highest‐occupied molecular orbital other complexes. Additionally, emission intensity clearly changed base. Quantum...

10.1002/chem.202300654 article EN Chemistry - A European Journal 2023-04-21

We report synthesis and optical properties of the dimers boron β‐dialdiminate complexes with different connection manners. The series dimers, o‐, m‐, p‐ d‐BisDAI, were prepared, their photophysical compared single unit, DAI. It was found that show characteristic properties: o‐BisDAI showed bathochromic shifts in absorption emission spectra quenching because through‐space interactions, while m‐BisDAI DAI almost identical. extension π‐conjugation p‐BisDAI could induce not only its bands but...

10.1002/chem.202500238 article EN Chemistry - A European Journal 2025-02-20

Helicobacter pylori infects the human stomach and is closely linked with development of gastric cancer. When detected, this pathogen can be eradicated from using wide-spectrum antibiotics. However, year by year, H. strains resistant to antibacterial action antibiotics have been increasing. The new substances effective against drug-resistant urgently required. Our group has recently identified extremely selective bactericidal effects in...

10.1002/lipd.12043 article EN Lipids 2018-04-01

Tourette syndrome (TS) is a developmental neuropsychiatric disorder that characterized by tic movements. Deep brain stimulation (DBS) may be treatment option for severe cases refractory to medical and behavioral therapies. In this study, we reviewed the surgical techniques used DBS in patients with TS its clinical outcomes sought determine optimal procedure current issues based on our experience literature. A total of 14 patients, consisting 13 men 1 woman, who underwent centromedian...

10.2176/jns-nmc.2023-0254 article EN cc-by-nc-nd Neurologia medico-chirurgica 2024-08-15

Abstract The total synthesis of the pentacyclic tetrahydroisoquinoline alkaloid quinocarcin, which possesses intriguing structural and biological features, has been achieved through a gold(I)‐catalyzed regioselective hydroamination reaction. It is noteworthy that regioselectivity intramolecular an unsymmetrical alkyne could be completely switched substrate control. Other key features this include highly stereoselective 2,5‐ cis ‐pyrrolidine amination bromoallene Lewis acid mediated ring...

10.1002/chem.201300687 article EN Chemistry - A European Journal 2013-05-16

This paper describes an along-wind vibration of frame-type pylons Hakucho Suspension Bridge found from longterm monitoring data.It is shown that the very harmonic although its amplitude small and it occurs under certain ranges wind direction (10~30 degree bridge perpendicular axis) velocity (13~25 m/s).The dominant frequency either 0.6 Hz or 0.8 depending on these correspond to natural frequencies in-plane pylon modes suspension bridge.A series tunnel experiments using a spring-supported...

10.5359/jawe.45.41 article EN Wind Engineers JAWE 2020-01-01

Heating of cycloalkanone-2-carboxylate with β-arylethylamine, and oxalylation the resulting enamino-ester followed by Lewis acid-catalyzed intramolecular cyclization afforded various erythrinan-type heterocycles in excellent yields. This method is widely applicable not only to synthesis erythrinans but also that A-nor A-homo analogs ring-D variants erythrinan. The alkoxycarbonyl group on products was readily removed a new decarbalkoxylation (heating magnesium chloride-dimethyl sulfoxide...

10.1248/cpb.38.1462 article EN Chemical and Pharmaceutical Bulletin 1990-01-01

We investigated earthquakes in Japan, where strong ground motion records coincided with building damage data, examining correlation between various indices of seismic destructive power and ratios. also carried out earhtquake response analyses calculated responses to one-cycle sine-wave inputs. proposed the average elastic acceleration or velocity at periods from 1.2 1.5 s a damping factor 0.05 as an optimum index for predicting The period range is based on equivalent that are residences...

10.3130/aijs.67.85_2 article EN Journal of Structural and Construction Engineering (Transactions of AIJ) 2002-01-01

For the prediction of relative stereochemistry 1,3-dimethyl substitution in alkyl chains, a simple approach based on 1H NMR data was recently proposed; Δδ values methylene protons located between methyl-substituted methine carbons can be diagnostic for predicting it. Here we applied this empirical "geminal proton rule" to verucopeptin, lipopeptide from Streptomyces sp. To determine absolute 1,3,5-trimethyl-substituted chain converted corresponding carboxylic acid by oxidative cleavage. The...

10.1021/jo500906v article EN The Journal of Organic Chemistry 2014-07-11

We propose a method of calculating seismic intesities by using response spectra in various period ranges. In the original JMA scale, weak, middle and strong ground motions are measured human body sense indoor objects motions, moderate damage to buildings, heavy respectively. These indices correspond ranges 0.1-1s, 0.5-1s 1-2s. then formulate low, high intensities with average also an algorithm synthesize these into single instrumental intensity.

10.3130/aijs.69.71_4 article EN Journal of Structural and Construction Engineering (Transactions of AIJ) 2004-01-01

Novelty is an important factor of creativity in product design. Acceptance novelty, however, depends on one's emotions. Yanagisawa, the last author, and his colleagues previously developed a mathematical model emotional dimensions associated with novelty such as arousal (surprise) valence (positivity negativity). The formalized Bayesian information gain function based Berlyne's potential theory. One becomes accustomed to by repeated exposure. This so-called habituation design long-term...

10.1109/smc.2019.8914626 article EN 2022 IEEE International Conference on Systems, Man, and Cybernetics (SMC) 2019-10-01

Luminescent materials that respond to changes in microscopic chemical conditions are essential for visualizing and evaluating molecular environments. Boron complexes often employed as robust scaffolds constructing such responsive systems because of their inherent stimuli-responsive properties. However, the case nonresponsive luminophores, absence these intrinsic features limits range applications. In this study, environment-responsive luminescent homopolymers based on boron β-dialdiminate...

10.1002/marc.202400775 article EN Macromolecular Rapid Communications 2024-11-15

Treatment of 2, 8-dioxo-1, 7-cycloerythrinans with phenylselenenyl chloride in the presence BF3·Et2O as a catalyst gave 3-chloro-3-phenylselenenyl derivaties through 3-phenylselenenyl derivative, which changed into Δ3-3-phenylselenenyl derivative on further reaction.Both and derivatives 3, 3-dimethoxy treatment mercury (II) perchlorate (MPC) methanol, thus providing new method for introduction masked carbonyl group at α-position to original group.Thus, reaction 1 under acidic conditions...

10.1248/cpb.39.1365 article EN Chemical and Pharmaceutical Bulletin 1991-01-01

In this study, the mechanisms associated with seismic response of a long-period structure when subjected to excitation are clarified. A typical scale cable-stayed bridge prestressed concrete girders (PC bridge) was selected for analysis. First, we simulated components ground motion at site Ji-Lu Bridge, which damaged in 1999 Chi-Chi, Taiwan earthquake, and damage assessed by nonlinear analysis using excitations. Second, shaking table tests model PC were carried out, consideration similarity...

10.2208/jsceja.64.982 article EN Doboku Gakkai Ronbunshuu A 2008-01-01

A period region of strong ground motions which have close relationship with actural damage to buildings was reinvertigated including the data by 2007 Noto-hanto Earthquake and Niigata-chuetsu-oki Earthquake, where 1.5-2 sec. 2-2.5 dominated records were observed for first time as site building data. I found that 1-1.5 response had closer actual buildings, compare previously proposed 1-2 region. The reason why in stead 1-1.5sec. previous study investigated. JR Takatori record 1995...

10.3130/aijs.74.1531 article EN Journal of Structural and Construction Engineering (Transactions of AIJ) 2009-01-01

We investigated the correspondence of strong ground motions and damage to houses buildings in 2011 Tohoku-Chiho Taiheiyo-oki earthquake. Structural by shaking was very small according investigation around motion observation sites. This because a short period below 0.5 second dominated motions, therefore, 1-2 responses which correlated with severe were small. proposed seismic intensity measure evaluate actual structural more accurately using equivalent damping. simple based on investigation.

10.3130/aijs.78.35 article EN Journal of Structural and Construction Engineering (Transactions of AIJ) 2013-01-01
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