521 research outputs found
Development of low cost motion-sensing system
Micro-electro-mechanical system (MEMS) technology offers sensors with lower cost, smaller size, lower power consumption. In this paper, a kind of low cost motion-sensing system based MEMS sensors is developed. The objective of the design is low cost, small volume and light weight in order to be used in many fields. The constituting principle of the system is described. Algorithms and hardware of the system are researched. And the definition of coordinate, calculation of pose angle, transform of acceleration and calculation of the velocities and displacement of the moving object are presented with corresponding mathematics model and algorithms. The experiments are carried out in principle and results are given. It is proved that the low cost motion-sensing system is effective and correct.<br /
Enhancing Detail Preservation for Customized Text-to-Image Generation: A Regularization-Free Approach
Recent text-to-image generation models have demonstrated impressive
capability of generating text-aligned images with high fidelity. However,
generating images of novel concept provided by the user input image is still a
challenging task. To address this problem, researchers have been exploring
various methods for customizing pre-trained text-to-image generation models.
Currently, most existing methods for customizing pre-trained text-to-image
generation models involve the use of regularization techniques to prevent
over-fitting. While regularization will ease the challenge of customization and
leads to successful content creation with respect to text guidance, it may
restrict the model capability, resulting in the loss of detailed information
and inferior performance. In this work, we propose a novel framework for
customized text-to-image generation without the use of regularization.
Specifically, our proposed framework consists of an encoder network and a novel
sampling method which can tackle the over-fitting problem without the use of
regularization. With the proposed framework, we are able to customize a
large-scale text-to-image generation model within half a minute on single GPU,
with only one image provided by the user. We demonstrate in experiments that
our proposed framework outperforms existing methods, and preserves more
fine-grained details
Metabolic profile, bioavailability and toxicokinetics of zearalenone-14-glucoside in rats after oral and intravenous administration by liquid chromatography high-resolution mass spectrometry and tandem mass spectrometry
Zearalenone-14-glucoside (ZEN-14G), a key modified mycotoxin, has attracted a great deal of attention due to the possible conversion to its free form of zearalenone (ZEN) exerting toxicity. In this study, the toxicokinetics of ZEN-14G were investigated in rats after oral and intravenous administration. The plasma concentrations of ZEN-14G and its major five metabolites were quantified using a validated liquid chromatography tandem mass spectrometry (LC-MS/MS) method. The data were analyzed via non-compartmental analysis using software WinNonlin 6.3. The results indicated that ZEN-14G was rapidly hydrolyzed into ZEN in vivo. In addition, the major parameters of ZEN-14G following intravenous administration were: area under the plasma concentration-time curve (AUC), 1.80 h.ng/mL; the apparent volume of distribution (V-Z), 7.25 L/kg; and total body clearance (CL), 5.02 mL/h/kg, respectively. After oral administration, the typical parameters were: AUC, 0.16 h.ng/mL; V-Z, 6.24 mL/kg; and CL, 4.50 mL/h/kg, respectively. The absolute oral bioavailability of ZEN-14G in rats was about 9%, since low levels of ZEN-14G were detected in plasma, which might be attributed to its extensive metabolism. Therefore, liquid chromatography high-resolution mass spectrometry (LC-HRMS) was adopted to clarify the metabolic profile of ZEN-14G in rats' plasma. As a result, eight metabolites were identified in which ZEN-14-glucuronic acid (ZEN-14GlcA) had a large yield from the first time-point and continued accumulating after oral administration, indicating that ZEN-14-glucuronic acid could serve a potential biomarker of ZEN-14G. The obtained outcomes would prompt the accurate safety evaluation of ZEN-14G
Shifted Diffusion for Text-to-image Generation
We present Corgi, a novel method for text-to-image generation. Corgi is based
on our proposed shifted diffusion model, which achieves better image embedding
generation from input text. Unlike the baseline diffusion model used in DALL-E
2, our method seamlessly encodes prior knowledge of the pre-trained CLIP model
in its diffusion process by designing a new initialization distribution and a
new transition step of the diffusion. Compared to the strong DALL-E 2 baseline,
our method performs better in generating image embedding from the text in terms
of both efficiency and effectiveness, resulting in better text-to-image
generation. Extensive large-scale experiments are conducted and evaluated in
terms of both quantitative measures and human evaluation, indicating a stronger
generation ability of our method compared to existing ones. Furthermore, our
model enables semi-supervised and language-free training for text-to-image
generation, where only part or none of the images in the training dataset have
an associated caption. Trained with only 1.7% of the images being captioned,
our semi-supervised model obtains FID results comparable to DALL-E 2 on
zero-shot text-to-image generation evaluated on MS-COCO. Corgi also achieves
new state-of-the-art results across different datasets on downstream
language-free text-to-image generation tasks, outperforming the previous
method, Lafite, by a large margin
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