88 research outputs found
PixelHuman: Animatable Neural Radiance Fields from Few Images
In this paper, we propose PixelHuman, a novel human rendering model that
generates animatable human scenes from a few images of a person with unseen
identity, views, and poses. Previous work have demonstrated reasonable
performance in novel view and pose synthesis, but they rely on a large number
of images to train and are trained per scene from videos, which requires
significant amount of time to produce animatable scenes from unseen human
images. Our method differs from existing methods in that it can generalize to
any input image for animatable human synthesis. Given a random pose sequence,
our method synthesizes each target scene using a neural radiance field that is
conditioned on a canonical representation and pose-aware pixel-aligned
features, both of which can be obtained through deformation fields learned in a
data-driven manner. Our experiments show that our method achieves
state-of-the-art performance in multiview and novel pose synthesis from
few-shot images.Comment: 8 page
RobustSwap: A Simple yet Robust Face Swapping Model against Attribute Leakage
Face swapping aims at injecting a source image's identity (i.e., facial
features) into a target image, while strictly preserving the target's
attributes, which are irrelevant to identity. However, we observed that
previous approaches still suffer from source attribute leakage, where the
source image's attributes interfere with the target image's. In this paper, we
analyze the latent space of StyleGAN and find the adequate combination of the
latents geared for face swapping task. Based on the findings, we develop a
simple yet robust face swapping model, RobustSwap, which is resistant to the
potential source attribute leakage. Moreover, we exploit the coordination of
3DMM's implicit and explicit information as a guidance to incorporate the
structure of the source image and the precise pose of the target image. Despite
our method solely utilizing an image dataset without identity labels for
training, our model has the capability to generate high-fidelity and temporally
consistent videos. Through extensive qualitative and quantitative evaluations,
we demonstrate that our method shows significant improvements compared with the
previous face swapping models in synthesizing both images and videos. Project
page is available at https://robustswap.github.io/Comment: 21 page
A clustering-based approach to automatic harmonic analysis: an exploratory study of harmony and form in Mozart’s piano sonatas
We implement a novel approach to automatic harmonic analysis using a clustering method on pitch-class vectors (chroma vectors). The advantage of this method is its lack of top-down assumptions, allowing us to objectively validate the basic music theory premise of a chord lexicon consisting of triads and seventh chords, which is presumed by most research in automatic harmonic analysis. We use the discrete Fourier transform and hierarchical clustering to analyse features of the clustering solutions and illustrate associations between the features and the distribution of clusters over sections of the sonata forms. We also analyse the transition matrix, recovering elements of harmonic function theory.Published versio
Endogenous metabolic markers for predicting the activity of dihydropyrimidine dehydrogenase
Five-fluorouracil (5-FU) is a chemotherapeutic agent that is mainly metabolized by the rate-limiting enzyme dihydropyrimidine dehydrogenase (DPD). The DPD enzyme activity deficiency involves a wide range of severities. Previous studies have demonstrated the effect of a DPYD single nucleotide polymorphism on 5-FU efficacy and highlighted the importance of studying such genes for cancer treatment. Common polymorphisms of DPYD in European ancestry populations are less frequently present in Koreans. DPD is also responsible for the conversion of endogenous uracil (U) into dihydrouracil (DHU). We quantified U and DHU in plasma samples of healthy male Korean subjects, and samples were classified into two groups based on DHU/U ratio. The calculated DHU/U ratios ranged from 0.52 to 7.12, and the two groups were classified into the 10th percentile and 90th percentile for untargeted metabolomics analysis using liquid chromatography-quantitative time-of-flight-mass spectrometry. A total of 4440 compounds were detected and filtered out based on a coefficient of variation below 30%. Our results revealed that six metabolites differed significantly between the high activity group and low activity group (false discovery rate q-value \u3c 0.05). Uridine was significantly higher in the low DPD activity group and is a precursor of U involved in pyrimidine metabolism; therefore, we speculated that DPD deficiency can influence uridine levels in plasma. Furthermore, the cutoff values for detecting DPD deficient patients from previous studies were unsuitable for Koreans. Our metabolomics approach is the first study that reported the DHU/U ratio distribution in healthy Korean subjects and identified a new biomarker of DPD deficiency
Association between Alcohol Intake and Abdominal Obesity among the Korean Population
OBJECTIVES: Although abdominal obesity has been reported to be highly related with alcohol intake, the results are still inconclusive. Therefore, this study was conducted to explore the association between alcohol and abdominal obesity among the Korean population.
METHODS: This study included 8,603 participants (men: 5,195, women: 3,408) aged 30 to 87 who visited the health promotion centers in Seoul for routine health examinations from April, 2006 to June, 2007. Abdominal obesity was defined as WC ≥90 cm for men and ≥85 cm for women in accordance with the Korean Society for the Study of Obesity. For ever drinkers, total alcohol consumption in grams was classified into four groups (group 1, non-drinkers; group 2, 1-10 g of alcohol per day; group 3, 11-20 g of alcohol per day; and group 4, over 20 g of alcohol per day).
RESULTS: The mean age of the study population was 45.4 yr old (men) and 45.3 yr (women). The average waist circumference was 85.3 cm in men and 75.3 cm in women. A high alcohol intake was associated with high waist circumference in both genders. In multivariate analysis, the group of men and women drinkers consuming >20 g in a day had a large waist circumference compared with men and women non-drinkers.
CONCLUSION: This study showed that a high alcohol intake was related to high waist circumference. Such association remained independently even after adjustment for smoking, which is strongly related to abdominal obesity.ope
Synthesis and Characterization of Polycarbonate Copolymers Containing Benzoyl Groups on the Side Chain for Scratch Resistance
The purpose of this study was to enhance the scratch resistance of polycarbonate copolymer by using 3,3′-dibenzoyl-4,4′-dihydroxybiphenyl (DBHP) monomer, containing benzoyl moieties on the ortho positions. DBHP monomer was synthesized from 4,4′-dihydroxybiphenyl and benzoyl chloride, followed by the Friedel-Craft rearrangement reaction with AlCl3. The polymerizations were conducted following the low-temperature procedure, which is carried out in methylene chloride by using triphosgene, triethylamine, bisphenol-A, and DBHP. The chemical structures of the polycarbonate copolymers were confirmed by 1H-NMR. The thermal properties of copolymers were investigated by thermogravimetric analysis and differential scanning calorimetry, and also surface morphologies were assessed by atomic force microscopy. The scratch resistance of homopolymer film (100 μm) changed from 6B to 1B, and the contact angle of a sessile water drop onto the homopolymer film also increased
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