62 research outputs found
Liposomal formulations for enhanced lymphatic drug delivery
AbstractThe lymphatic system that extends throughout the whole body is one of useful targets for efficient drug delivery. The intestinal lymphatic drug delivery has been actively studied to date because administered drugs can avoid the first-pass metabolism in the liver, resulting in improvement of oral bioavailability. Drugs must be hydrophobic in order to be transported into the intestinal lymphatics because the lipid absorption mechanism in the intestine is involved in the lymphatic delivery. Therefore, various lipid-based drug carrier systems have been recently utilized to increase the transport of drug into the intestinal lymphatics. Lipidic molecules of the lipid-based drug delivery systems stimulate production of chylomicrons in the enterocytes, resulting in an increase in drug transport into lymphatic in the enterocytes. This review summarizes recently reported information on development of liposomal carriers for the intestinal lymphatic delivery and covers important determinants for successful lymphatic delivery
N-RPN: Hard Example Learning for Region Proposal Networks
The region proposal task is to generate a set of candidate regions that
contain an object. In this task, it is most important to propose as many
candidates of ground-truth as possible in a fixed number of proposals. In a
typical image, however, there are too few hard negative examples compared to
the vast number of easy negatives, so region proposal networks struggle to
train on hard negatives. Because of this problem, networks tend to propose hard
negatives as candidates, while failing to propose ground-truth candidates,
which leads to poor performance. In this paper, we propose a Negative Region
Proposal Network(nRPN) to improve Region Proposal Network(RPN). The nRPN learns
from the RPN's false positives and provide hard negative examples to the RPN.
Our proposed nRPN leads to a reduction in false positives and better RPN
performance. An RPN trained with an nRPN achieves performance improvements on
the PASCAL VOC 2007 dataset
UGPNet: Universal Generative Prior for Image Restoration
Recent image restoration methods can be broadly categorized into two classes:
(1) regression methods that recover the rough structure of the original image
without synthesizing high-frequency details and (2) generative methods that
synthesize perceptually-realistic high-frequency details even though the
resulting image deviates from the original structure of the input. While both
directions have been extensively studied in isolation, merging their benefits
with a single framework has been rarely studied. In this paper, we propose
UGPNet, a universal image restoration framework that can effectively achieve
the benefits of both approaches by simply adopting a pair of an existing
regression model and a generative model. UGPNet first restores the image
structure of a degraded input using a regression model and synthesizes a
perceptually-realistic image with a generative model on top of the regressed
output. UGPNet then combines the regressed output and the synthesized output,
resulting in a final result that faithfully reconstructs the structure of the
original image in addition to perceptually-realistic textures. Our extensive
experiments on deblurring, denoising, and super-resolution demonstrate that
UGPNet can successfully exploit both regression and generative methods for
high-fidelity image restoration.Comment: Accepted to WACV 202
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