Uniform Optical Flow Model by Foveation Effect for Virtual Cylindrical Screen Algorithm

Sota Shimizu,Takumi Hashizume 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8

This paper focuses on extending the Virtual Cylindrical Screen (VCS) algorithm for detecting stationary objects inside a VCS, when a sensor moves forward along the optical axis. Effect by foveation in use of the VCS algorithm are simulated and discussed by comparing a pinhole camera (PHC) model with 2 foveation models, that is, a sine curve (SC) model and Advanced Wide Angle Foveated (AdWAF) odel. The foveation models reduce the optical flow and also its variation. Correction weight function (CWF) is defined for estimating error of the optical flow computed in each image model. Moreover, Uniform Optical Flow (UOF) model is designed as a foveation model for the VCS algorithm, and its properties are discussed. Accuracy of the optical flow corresponding to the VCS is simulated using CWF. AdWAF model has advantages of accuracy comparing with not only the PHC model but also the SC model when the v??t /R is less than 0.14. Experiments using the Lucas-Kanade method are demonstrated for the images by UOF model.

Suppressive Effects of Mesenchymal Stem Cells in Adipose Tissue on Allergic Contact Dermatitis

( Sota Kikuchi ),( Koichi Yanaba ),( Yoshimasa Nobeyama ),( Shigeharu Yabe ),( Masahiro Kiso ),( Hidehisa Saeki ),( Yayoi Tada ),( Hidemi Nakagawa ),( Hitoshi Okochi ) 대한피부과학회 2017 Annals of Dermatology Vol.29 No.4

Background: Allergic contact dermatitis (ACD), which is ac-celerated by interferon (IFN)-γ and suppressed by inter-leukin (IL)-10 as regulators, is generally self-limited after re-moval of the contact allergen. Adipose tissue-derived multi-potent mesenchymal stem cells (ASCs) potentially exert im-munomodulatory effects. Considering that subcutaneous adipose tissue is located close to the site of ACD and includes mesenchymal stem cells (MSCs), the MSCs in adipose tissue could contribute to the self-limiting course of ACD. Objective: The aims of the present study were to elucidate the effects of MSCs in adipose tissue on ACD and to examine any cyto-kine- mediated mechanisms involved. Methods: Ear thick-ness in a C57BL/6 mouse model of ACD using contact hyper-sensitivity (CHS) elicited by 2,4,6-trinitro-1-chlorobenzene was evaluated as a marker of inflammation level. Five and nine mice were injected with ASCs and phosphate-buffered saline (PBS), respectively. After ASC or PBS injection, re-al- time reverse transcription-polymerase chain reaction and enzyme-linked immunosorbent assay were performed. Results: Histology showed that CHS was self-limited and ear thickness was suppressed by ASCs in a dose-dependent manner. IFN-γ expression in the elicited skin site and re-gional lymph nodes was significantly lower in ASC-treated mice than in control mice. IL-10 expression did not differ be-tween treated and control mice. The suppressive effects of ASCs on CHS response did not differ between IL-10 knock-out C57BL/6 mice and wild-type mice. Conclusion: The present findings suggest that MSCs in adipose tissue may contribute to the self-limiting course of ACD through de-creased expression of IFN-γ, but not through increased ex-pression of IL-10. (Ann Dermatol 29(4) 391∼399, 2017)

Caught Between Two Worlds : Political Change in Japan

Sota Kato 동아시아재단 2009 Global Asia Vol.4 No.1

Slightly-slacked dropout for improving neural network learning on FPGA

Sota Sawaguchi,Hiroaki Nishi 한국통신학회 2018 ICT Express Vol.4 No.2

Neural Network Learning (NNL) is compute-intensive. It often involves a dropout technique which effectively regularizes the network to avoid overfitting. As such, a hardware accelerator for dropout NNL has been proposed; however, the existing method encounters a huge transfer cost between hardware and software. This paper proposes Slightly-Slacked Dropout (SS-Dropout), a novel deterministic dropout technique to address the transfer cost while accelerating the process. Experimental results show that our SS-Dropout technique improves both the usual and dropout NNL accelerator, i.e., 1.55 times speed-up and three order-of-magnitude less transfer cost, respectively.

Dramatic Developmental Change of the Native Capsicum chinense from Seychelles in Relative Warm Temperature around 24℃

Sota Koeda,Munetaka Hosokawa,Byoung-Cheorl Kang,Doil Choi,Susumu Yazawa 한국원예학회 2008 한국원예학회 기타간행물 Vol.- No.-

Effects of RF power on Au-induced layer-exchange crystalline Ge formation using sputtering deposition

Sota TANAMI,Yoshinori OIDE,Daisuke YAMASHITA,Hyunwoong SEO,Naho ITAGAKI,Kazunori KOGA,Masaharu SHIRATANI 한국진공학회 2016 한국진공학회 학술발표회초록집 Vol.2016 No.8

Numerical Study of Roton-Like Collective Excitations in Glassy Materials

Shigetoshi Sota,Masaki Itoh 한국물리학회 2009 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.54 No.1

Roton-like collective excitations of non-quantum origin have been recognized for quite a long time in many structurally disordered materials. A classical study is attempted of a computer-quenched Lennard-Jones glass in the present article. We show that the collective excitations involve vortex motions, as argued by Feynman for quantum liquids. Adopting the harmonic approximation, we constructed the dynamical structure factor and calculated its eigenvectors at several frequencies in order to visualize the respective atomic motions. Some of them are just like those predicted by Feynman, although we obtained them irrelevant of the Bose statistics. We also calculated the dynamical structure factor and confirmed the characteristic roton minimum in the dispersion relation, which is quantitatively close to that observed for liquid Ar.

Calculating the Eigenvalue Spectrum and the Eigenvectors of a Large Matrix: an Efficient Scheme with Application to Electron Transport

Shigetoshi Sota,Masaki Itoh 한국물리학회 2009 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.54 No.1

The kernel polynomial method (KPM), developed by Voter et al, has been recognized as an effective order-N method for calculating the eigenvalue spectrum of a large Hamiltonian. The efficiency of its algorithm is due to the three-term recurrence formula of the polynomial. The central issue is, however, how the Gibbs oscillation can be suppressed and the technique of the Gibbs damping factor has been used with the aid of a particular property of the Chebysheff polynoimial. In this study, we propose a new method that substitutes for the original KPM by using Legendre polynomial. Instead of using the damping factor, we introduce a new basis set by regulating the polynomial in such a way that the series is bound to converge to the exact Green's function without having Gibbs oscillations. The scheme is general enough to deal with the entire family of physical quantities that can be related to the Green's function. This includes the two-particle properties such as electron transport. It further enables the eigenvectors to be calculated in the same algorithm. In all these calculations, the numerical precision is unlimited and is controlled solely by the order of the truncation. The accuracy is confirmed up to six digits in our numerical tests for the dynamics of a simple cubic lattice of 19^3 atoms. We also show a preliminary calculation of the dc transport for the 2D-Anderson model. The kernel polynomial method (KPM), developed by Voter et al, has been recognized as an effective order-N method for calculating the eigenvalue spectrum of a large Hamiltonian. The efficiency of its algorithm is due to the three-term recurrence formula of the polynomial. The central issue is, however, how the Gibbs oscillation can be suppressed and the technique of the Gibbs damping factor has been used with the aid of a particular property of the Chebysheff polynoimial. In this study, we propose a new method that substitutes for the original KPM by using Legendre polynomial. Instead of using the damping factor, we introduce a new basis set by regulating the polynomial in such a way that the series is bound to converge to the exact Green's function without having Gibbs oscillations. The scheme is general enough to deal with the entire family of physical quantities that can be related to the Green's function. This includes the two-particle properties such as electron transport. It further enables the eigenvectors to be calculated in the same algorithm. In all these calculations, the numerical precision is unlimited and is controlled solely by the order of the truncation. The accuracy is confirmed up to six digits in our numerical tests for the dynamics of a simple cubic lattice of 19^3 atoms. We also show a preliminary calculation of the dc transport for the 2D-Anderson model.

A Map-based Cloning Approach for the Identification of a Low Temperature Sensitive Gene sy-2 in Chilli pepper (Capsicum chinense)

L iLiu,Jin-Ho Kang,Yeong Deuk Jo,Sota Koeda,Munetaka Hosokawa,Doil Choi,Byoung-Cheorl Kang 한국육종학회 2014 한국육종학회 심포지엄 Vol.2014 No.07

sy-2 (Seychelles-2) is a temperature sensitive mutant of Capsicum chinense and native to Seychelles Island in Africa. Previously we showed that sy-2 leaves were irregularly shaped and defective in chlorophyll development at temperatures lower than 24℃. A segregation test revealed that the sy-2 gene is controlled by a single recessive gene. To identify the sy-2 gene, we performed a map-based cloning approach using a total of 1,010 F2 plants derived from crossing sy-2 and the wild type C. chinense ‘No.3341’. sy-2 gene is located on chromosome 1, 0.3 cM and 0.1cM away from cosII markers C2_At4g29120 and C2_At1g09070, respectively. The tomato genome sequence between those two markers was compared with pepper genome sequence. We found three of pepper scaffold sequences in this region. We developed seven ingle nucleotide polymorphism (SNP) markers on the pepper scaffold sequences, among which five SNP markers were co-segregated with sy-2. To fill the gap between the scaffolds which contains co-segregating markers, we screened a bacterial artificial chromosome (BAC) library, and end-sequences of total of 22 AC clones were i. We found that five clones were overlapped to cover the gap. We fully sequenced four AC clones and found that the physical distance between C2_At4g29120 and C2_At1g09070 is 343kb. This region contains 70 putative genes such as HSP90-like ATPase family proteins, lipid-transfer proteins, calmodulin-domain protein kinases, and zinc finger proteins (ZFPs). To identify the sy-2 gene, we performed RT-PCR and found that a ZFP-like gene is differentially expressed between WT and sy-2 leaves. This result suggests that the ZFP-like gene is a strong candidate for the sy-2 gene. We are currently characterizing this candidate gene.

Sensilla on the External Genitalia of the Carabid Beetle, Carabus (Ohomopterus) dehaanii dehaanii (Coleoptera, Carabidae)

김중락,Sota TEIJI 한국곤충학회 2004 Entomological Research Vol.34 No.3

Sensilla on the male and female external genitalia of the carabid beetle, Carabus(Ohomopterus) dehaanii dehaanii Chaudoir, were investigated with scanning electron microscopy.The investigation for female genitalia was conducted on the coxites and styli. As a result, 4 typesof sensilla were distinguished. In male, a total of 6 types of sensilla were identified on theaedeagus. The external morphology and distribution pattern of each type of the sensilla in bothsexes were described. Results are expected to provide a ground work for future research on thephylogenetic study of the genus Carabus and the comparative ultrastructure or behavior in thecarabid beetle.