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A STUDY ON VQ BASED COMPRESSION OF HIGH DYNAMIC RANGE IMAGES
Nagisa Sugiyama,Masahiro Okuda 대한전자공학회 2008 ITC-CSCC :International Technical Conference on Ci Vol.2008 No.7
An encoding method of the high dynamic range (HDR) images based on Vector Quantization is discussed. The HDR images have much higher dynamic ranges compared with the low dynamic range (LDR) images. Due to its high dynamic range, the size is often huge, thus development for functional compression is needed. On the other hand, we often need to convert them into the LDR images because the existing output devices cannot directly output the dynamic ranges of HDR images. Our goal is to develop a HDRI compression method that minimizes the error of the tone-mapped LDR images. Therefore we applied the adjustment of scale and the evaluation of the error in the log domain. Our method improves a compression performance, compared to methods that directly apply the conventional vector quantization to the HDR images.
PROPERTIES OF DUST OBSCURED GALAXIES IN THE NEP-DEEP FIELD
Nagisa Oi,Hideo Matsuhara,CHRIS PEARSON,Veronique Buat,Denis Burgarella,Matt Malkan,Takamitsu Miyaji 한국천문학회 2017 天文學論叢 Vol.32 No.1
We selected 47 DOGs at z ~ 1.5 using optical $R$ (or $r^{'}$), AKARI 18 $\mu$m, and 24 $\mu$m color in the AKARI North Ecliptic Pole (NEP) Deep survey field. Using the colors among 3, 4, 7, and $9\mu$m, we classified them into 3 groups; bump DOGs (23 sources), power-law DOGs (16 sources), and unknown DOGs (8 sources). We built spectral energy distributions (SEDs) with optical to far-infrared photometric data and investigated their properties using SED fitting method. We found that AGN activity such as a AGN contribution to the infrared luminosity and a Chandra detection rate for bump and power-law DOGs are significantly different, while stellar component properties like a stellar mass and a star-formation rate are similar to each other. A specific star-formation rate range of power-law DOGs is slightly higher than that of bump DOGs with wide overlap. Herschel/PACS detection rates are almost the same between bump and power-law DOGs. On the other hand SPIRE detection rates show large differences between bump and power-law DOGs. These results might be explained by differences in dust temperatures. Both groups of DOGs host hot and/or warm dust (~ 50 Kelvin), and many bump DOGs contain cooler dust ($\hspace{0.3em}\raisebox{0.4ex}{$<$}\hspace{-0.75em}\raisebox{-.7ex}{$\sim$}\hspace{0.3em}$ 30 Kelvin).
ON SOME PROPERTIES OF BOUNDED HOMOMORPHISMS AND DERIVATIONS OF A C*-ALGEBRA
Nagisa, Masaru,Nam, Young-Man The Youngnam Mathematical Society Korea 1988 East Asian mathematical journal Vol.4 No.-
We consider some properties of the completely bounded representations of C*-algebras. We discuss the relation between the k-similarity and the property $D_k$ and get the result every k-similar C*-algebra has property $D_k$. Moreover we determine the similarity problem for the algebra C$\bigoplus$C precisely and constructively.
EVOLUTION OF LUMINOUS INFRARED GALAXIES REVEALED BY NEAR-INFRARED MULTI-BAND IMAGING OF THEIR HOSTS
Oi, Nagisa,Imanishi, Masatoshi The Korean Astronomical Society 2012 天文學論叢 Vol.27 No.4
We present the result of our near infrared J- (${\lambda}=1.25{\mu}m$), H- (${\lambda}=1.63{\mu}m$), and $K_s$-band (${\lambda}=2.14{\mu}m$) imaging of ultraluminous ($L_{IR}$ > $10^{12}L_{\odot}$) and luminous ($L_{IR}=10^{11-12}L_{\odot}$) infrared galaxies (ULIRGs and LIRGs), to investigate their relationship through properties of their host galaxies. We find that (1) for single-nucleus ULIRGs and LIRGs, their spheroidal host galaxies have similar properties, but ULIRGs display a substantially higher level of nuclear activity than LIRGs, suggesting that their infrared luminosity difference comes primarily from the different level of current nuclear activity. We infer that LIRGs and ULIRGs have similar progenitor galaxies, follow similar evolutionary processes, and may evolve into optically-selected QSOs. (2) Largely-separated multiple-nuclei ULIRGs have significantly brighter host galaxies than single-nucleus ULIRGs and LIRGs in $K_s$-band, indicating that multiple-nuclei ULIRGs have a bias towards mergers of intrinsically large progenitor galaxies, in order to produce high infrared luminosity ($L_{IR}$ > $10^{12}L_{\odot}$) even at the early merging stage. (3) We derive dust extinction of host galaxies of ULIRGs and LIRGs to be $A_V$ ~ 14 mag in the optical or equivalently $A_K$ ~ 0.8 mag in the near-infrared $K_s$-band, based on the comparison of host galaxy's luminosities in the J-, H-, and $K_s$-bands.
Optical – near-infrared catalog for the AKARI north ecliptic pole Deep field
Oi, Nagisa,Matsuhara, Hideo,Murata, Kazumi,Goto, Tomotsugu,Wada, Takehiko,Takagi, Toshinobu,Ohyama, Youichi,Malkan, Matthew,Im, Myungshin,Shim, Hyunjin,Serjeant, Stephen,Pearson, Chris Springer-Verlag 2014 Astronomy and astrophysics Vol.566 No.-
( Kazuko Iwata ),( Nagisa Hara ),( Masumi Ishidome ),( Hirohide Miyachi ),( Motoh Iwasa ),( Yoshiyuki Takei ) 한국정맥경장영양학회 2014 한국정맥경장영양학회 학술대회집 Vol.2014 No.-
Objective: Liver cirrhosis (LC) is frequently complicated by protein-energy malnutrition (PEM) and the prognosis in such patients is poor. The body composition of patients with PEM comprises increased total body water and decreased fat and muscle mass. Body composition analyzers based on multi-frequency bioelectrical impedance (MF-BIA) are becoming increasingly available in clinical settings. Functional hepatic reserve as represented by the Child-Pugh score is often used to determine survival prognosis in LC patients; however, the relationship between body composition and prognosis has not been adequately investigated. Furthermore, while differences in body composition between men and women are known to exist in healthy populations, the details of sex differences in body composition in LC patients are unclear. The present study measured body composition in LC patients using BIA, analyzed the relationship between body composition and survival prognosis, and investigated sex differences. Methods: Adult patients with LC who underwent nutritional assessment at our hospital were eligible. In addition to blood screening and evaluation of clinical characteristics, body mass index (BMI; kg/m2), visceral fat area (VFA; cm2), edema rate (extracellular water/total body water); and regional skeletal muscle mass (kg) were measured using an InBody720® (Biospace) body composition analyzer. Patient survival rates were investigated and Kaplan-Meier survival analysis was performed using each parameter: sex, age (cutoff: 65 years), presence or absence of secondary hepatocellular carcinoma (HCC), serum albumin (cutoff: 3.5 g/dl), Child-Pugh classification (A vs. B+C), use or non-use of branched chain amino acids (BCAAs), BMI (cutoff: 22 kg/m2), VFA (cutoff: 70 cm2), arm index (arm skeletal muscle mass/height; cutoff: men, 1.7 kg/m2; women, 1.2 kg/m2) and edema rate (cutoff: 0.398). Results: Subjects comprised 161 LC patients (94 men, 67 women; mean age, 67.9 years). The causative factors of LC comprised hepatitis B virus (n=9), hepatitis C virus (n=101), alcoholism (n=26) and other causes (n=25). The mean Child-Pugh score was 6.8±1.7 and 81 subjects had HCC (50%). No sex differences were observed for serum albumin levels, LC severity, or HCC rates. Survival analysis by sex revealed that survival prognosis was worse among elderly women but was unaffected by the presence or absence of HCC in either sex. In both men and women, serum albumin <3.5 g/dl, a Child-Pugh classification of B or C, and use of BCAAs were all associated with poorer prognosis. With regard to body composition parameters, survival prognosis was worse for men with a decreased VFA and arm index and women with a high edema rate. Conclusion: Because BIA is based on measurements of total body water, its accuracy is affected by edemaand ascites. In the present study, arm measurements were used to evaluate skeletal muscle in order to minimize these effects. The present findings revealed that survival prognosis in LC is related to body composition parameters such as decreased VFA, arm index and high edema rate, in addition to known factors such as low serum albumin and a high Child-Pugh score. BIA is a useful method of assessing body composition; however, the sex differences in body composition mean that care is required when estimating survival prognosis based on body composition measurements in women.
ON THE EXTENDED HAAGERUP TENSOR PRODUCT IN OPERATOR SPACES
Itoh, Takashi,Nagisa, Masaru Korean Mathematical Society 2014 대한수학회지 Vol.51 No.2
We describe the Haagerup tensor product ${\ell}^{\infty}{\otimes}_h{\ell}^{\infty}$ and the extended Haagerup tensor product ${\ell}^{\infty}{\otimes}_{eh}{\ell}^{\infty}$ in terms of Schur product maps, and show that ${\ell}^{\infty}{\otimes}_h{\ell}^{\infty}{\cap}\mathbb{B}({\ell}^2)$(resp. ${\ell}^{\infty}{\otimes}_{eh}{\ell}^{\infty}{\cap}\mathbb{B}({\ell}^2)$) coincides with $c_0{\otimes}_hc_0{\cap}\mathbb{B}({\ell}^2)$(resp. $c_0{\otimes}_{eh}c_0{\cap}\mathbb{B}({\ell}^2)$). For $C^*2$-algebras A, B, it is shown that $A{\otimes}_hB=A{\otimes}_{eh}B$ if and only if A or B is finite-dimensional.
Satoshi Koyama,Nagisa Yoshihara,Atsushi Takagi,Etsuko Komiyama,Akira Oka,Shigaku Ikeda 대한피부과학회 2023 Annals of Dermatology Vol.35 No.5
Background: Alopecia areata (AA) is considered complex genetic and tissue-specific autoimmune disease. We recently discovered a nonsynonymous variant in the coiled-coil alphahelical rod protein 1 (CCHCR1) gene within the AA risk haplotype. And a water avoidance stress test on CCHCR1 knockout mice induced AA-like lesions. Objective: To investigate the difference clinical findings of AA in patients with the CCHCR1 variant and without. Methods: We conducted a retrospective analysis of the data from 142 AA patients. Among these patients, 20 (14.1%) had a variant of CCHCR1. We evaluated the sex distribution of the patients, age at onset, distribution of the clinical types, prevalence of a positive family history of AA, prevalence of association of AA with atopic dermatitis, response to steroid therapy, and recurrence rate. We used multivariate logistic regression analysis and Fisher’s exact test for statistical analysis. We also investigate electron microscopic observations of hair samples with the CCHCR1 variant and without. Results: The results showed a significant correlation between the CCHCR1 variant and the recurrence rate compared with the variant-negative group (p=0.0072). Electron microscopy revealed abnormalities in the hair shaft structure and hair cuticle in patients with the CCHCR1 variant (p=0.00174). Conclusion: Our results suggest that AA with CCHCR1 variant is clinically characterized by a high recurrence rate and hair morphological abnormality