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Magnetism and Multiplets in Fe-phthalocyanine Molecules
Yukie Kitaoka,Kohji Nakamura,Toru Akiyama,Tomonori Ito,M. Weinert,A. J. Freeman 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.63 No.3
Magnetism and multiplets for Fe-phthalocyanine molecules were investigated based on the constraintdensity functional theory (DFT) by imposing a density matrix constraint on the d-orbitaloccupation numbers. We demonstrate that for a single FePc molecule, there are three stationarystates of multiplets, 3Eg, 3A2g, and 3B2g, and that the magnetic anisotropy (MA) strongly dependson the multiplet structures. The ground state of the 3A2g obtained from the constraint DFT totalenergy calculations has planar MA, with the spin moments pointing along the molecule’s planardirection. The columnar stacking structure for α-FePc, with the ground state of the 3Eg, showsplanar MA.
Ito-Takeuchi, Hitomi,Takahashi, Kai,Bouchekioua, Selma,Yamauchi, Chihiro,Takeuchi, Yuki,Hur, Sung-Pyo,Lee, Young-Don,Takemura, Akihiro Informa UK (TaylorFrancis) 2017 Chronobiology international Vol.34 No.8
<P>Most wrasse species swim during the day and bury themselves in the sandy bottoms of shallow reefs at night. This study aimed to evaluate the importance of sandy bottoms to the day-active/ night-inactive rhythmicity of the tropical wrasse Halichoeres trimaculatus. Actogram analysis revealed that fish were active during the photophase and inactive during the scotophase in aquariums with both sandy and bare bottoms. When fish were kept in aquariums with bare bottoms, rhythmicity was maintained under constant dark conditions (DD) but became obscured under constant light conditions (LL), suggesting that a day-active/night-inactive rhythmicity is regulated by the circadian system. Robust fluctuations in Period1 (wPer1) and Period2 (wPer2) expression were observed in the pectoral fin tissue under light-dark conditions (LD). Similar fluctuations in wPer1 expression persisted under DD. When fish were kept under LD conditions for 7 days and then DD for 20 days, the emergence of fish from the sandy bottom was delayed gradually. At the same time, the peak time of wPer1 expression under DD was retarded from 06: 00 to 10:00. Although wPer2 expression was dampened under DD, it increased after exposing fish to light. These results suggest that wPer1 and wPer2 are differentially involved in the day-active/ night-inactive rhythmicity, and that blocking light with a sandy bed at night and exposing fish to light during emergence in the morning play important roles in maintaining consistent activities in wrasse species.</P>
Asynchronous Track Algorithm Using TDOA/FDOA Measurements in the Distributed Sensor Network
Yuki TAKABAYASHI,Takashi MATSUZAKI,Hiroshi KAMEDA,Masayoshi ITO 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
This paper proposes a target tracking algorithm using asynchronous TDOA(Time Difference of Arrival) and FDOA(Frequency Difference of Arrival) measurements for a single target in a distributed sensor network. A conventional algorithm, target localization through TDOA measurements cannot estimate target position when the number of TDOA measurements are not enough for localization at the same time. Thereby, track initialization time is delayed and track accuracy deteriorates in case of that probability of measurements detection for each sensor is low. Our algorithm uses TDOA and FDOA measurements at the different time to compute the position and velocity estimates. Through computer simulation trials, the validity of our algorithm is confirmed.
Oncogenic RUNX3: A Link between p53 Deficiency and MYC Dysregulation
Date, Yuki,Ito, Kosei Korean Society for Molecular and Cellular Biology 2020 Molecules and cells Vol.43 No.2
The RUNX transcription factors serve as master regulators of development and are frequently dysregulated in human cancers. Among the three family members, RUNX3 is the least studied, and has long been considered to be a tumor-suppressor gene in human cancers. This idea is mainly based on the observation that RUNX3 is inactivated by genetic/epigenetic alterations or protein mislocalization during the initiation of tumorigenesis. Recently, this paradigm has been challenged, as several lines of evidence have shown that RUNX3 is upregulated over the course of tumor development. Resolving this paradox and understanding how a single gene can exhibit both oncogenic and tumor-suppressive properties is essential for successful drug targeting of RUNX. We propose a simple explanation for the duality of RUNX3: p53 status. In this model, p53 deficiency causes RUNX3 to become an oncogene, resulting in aberrant upregulation of MYC.
Xinghui Li,Yuki Shimizu,So Ito,Wei Gao 한국정밀공학회 2013 International Journal of Precision Engineering and Vol. No.
This paper presents a cost-effective fabrication method of grating structures with a period of sub-μm for surface encoders. By employing an inexpensive and compact blue laser diode, which has a wavelength of 405 nm and is used in Blu-ray disc drives, a Lloyd’s mirror interferometer has been developed to carry out laser interference lithography for the fabrication of grating structures. Experimental results showed that the developed fabrication system is capable of fabricating grating structures with a pitch of 570 nm. The relative pitch deviation is confirmed to be approximately 1%, which meets the requirement for the scale grating used in a surface encoder. The influence of the limited coherence length of the laser diode on the fabrication area of the grating structures has also been investigated. To expand the fabrication area of the grating structure, a laser source, which has a wavelength of 405 nm and a longer coherence length with a mode selection cavity, is employed in the fabrication system. It has been verified by experiments that the fabrication area of the sub-μm periodic grating structures can be expanded to 300 mm2 with the laser source.
Surface Profile Measurement of Internal Micro-Structures
Bin Xu,Yuki Shimizu,So Ito,Wei Gao 한국정밀공학회 2013 International Journal of Precision Engineering and Vol. No.
A measurement system is presented for surface profile measurements of micro-structures generated on internal cylindrical surfaces of workpieces. The main components of the measurement system are an air-bearing spindle to rotate the measured internal microstructures,an air-bearing displacement sensor with a diamond micro-stylus probe to scan the surface profile of the internal microstructures being measured and a vibration isolation table to reduce the disturbance of the measurement environment. The stability of the air-bearing displacement sensor with a diamond micro-stylus probe was experimentally investigated. Measurements of surface profile of internal micro-structures were also carried out while employing a newly-developed algorithm to correct errors caused by the tip radius of the diamond micro-stylus.
Zhigang Jia,So Ito,Keiichiro Hosobuchi,Shigeaki Goto,Yuki Shimizu,Gaofa He,Wei Gao 한국정밀공학회 2013 International Journal of Precision Engineering and Vol. No.
This paper presents the electrostatic force characterization of a prototype scanning electrostatic force microscope (SEFM) system developed for surface profile measurement in noncontact condition. In the SEFM system, with applying a dual height method, the distance between the probe tip and the sample surface can be accurately obtained by removing the influence of the electric field distribution on the sample surface. Since the electrostatic force is greatly influenced by the capacitance between the probe tip and the sample surface, a new approach for modeling and characterization of the distribution of capacitance between the probe tip with an arbitrary shape and the sample surface with a random topography by using the finite difference method (FDM) is proposed. The electrostatic forces calculated by the FDM method and the conventional sphere-plane model are compared to verify the validity of the FDM method. The frequency shift values measured by the experiment are also compared with the simulation results calculated by the FDM method. It has been demonstrated that the electrostatic force between arbitrary shapes of the probe tip and the sample surface can be well calculated by the FDM.
Siew Leng Tan,Yuki Shimizu,Takayuki Meguro,So Ito,Wei Gao 한국정밀공학회 2015 International Journal of Precision Engineering and Vol. No.
This paper presents the design and construction of a laser autocollimator-based optical sensor for measurement of the tilt angles ofa reflector mounted on the guideways or the moving table of a precision linear slide in the production process of the slide, wherethe measurement is repeatedly carried out together with a hand scraping operation for correction of the form errors of the slideguideways. Differing from a conventional autocollimator, a laser rangefinder unit is integrated with the autocollimation unit fordetection of the positions of the reflector, which is necessary for the efficient error correction of the slide guideways. Theautocollimation unit and the rangefinder unit share the same light source for a compact optical design. The optical power of the laserbeam is first set to be constant for tilt angles measurement. Then the optical power is modulated with a frequency of 66.7 MHz formeasuring the position/distance based on the phase shift method. The resolution of the laser autocollimator is confirmed to be 0.2arc-second over a range of ±50 arc-seconds while the measurement positions can be detected with a resolution of 1 mm by therangefinder, which satisfies the requirements from production of the slide.
Yoshihide Kanno,Kei Ito,Shinsuke Koshita,Takahisa Ogawa,Hiroaki Kusunose,Kaori Masu,Toshitaka Sakai,Toji Murabayashi,Sho Hasegawa,Fumisato Kozakai,Yujiro Kawakami,Yuki Fujii,Yutaka Noda 대한소화기내시경학회 2018 Clinical Endoscopy Vol.51 No.3
Background/Aims: Although both radial- and convex-arrayed endoscopic ultrasonography (EUS) scopes are widely used forobservational EUS examinations, there have been few comparative studies on their power of visualization. The aim of this study was toevaluate the capability of these EUS scopes for observation of the pancreatobiliary junction. Methods: The rate of successful visualization of the pancreatobiliary junction was retrospectively compared between a radial-arrayedand a convex-arrayed echoendoscope, from a prospectively maintained database. Study periods were defined as January 2010 toDecember 2012 for the radial group, and February 2015 to October 2016 for the convex group because the respective scope wasmainly used during those periods. Results: During the study period, 1,660 cases with radial EUS and 1,984 cases with convex EUS were recruited. The success rates ofobservation of the pancreatobiliary junction were 80.0% and 89.5%, respectively (p<0.0001). Conclusions: The capability of visualization of the pancreatobiliary junction in observational EUS was found to be better with aconvex-arrayed than with a radial-arrayed echoendoscope