257 research outputs found
An improved support vector regression and its modelling of manoeuvring performance in multidisciplinary ship design optimization
In this paper, the combination of the Laplace loss function and Support Vector Regression (SVR) are presented for the estimation of manoeuvring performance in multidisciplinary ship design optimization, and a new SVR algorithm was proposed, which has only one parameter to control the errors and automatically minimized with v, and adds b2/2 b to the item of confidence interval. It is shown that the proposed SVR algorithm in conjunction with the Laplace loss function can estimate the ship manoeuvring performance appropriately compared to the simulation results with Napa software and other approximation methods such as Artificial Neural Network (ANN) and classic SVR. In this article, we also gather enough ship information about the offshore support vessel; the Latin Hypercube Design is employed to explore the design space. Instead of requiring the evaluation of expensive simulation codes, we establish the metamedels of ship manoeuvring performance; all the numerical results show the effectiveness and practicability of the new approximation algorithms
Gene expression profile indicates involvement of NO in Camellia sinensis pollen tube growth at low temperature
DEGs identified from the comparison between control (CsPT-CK) and 4 °C-treated (CsPT-LT) pollen tbues. All of the samples were replicated three times. CK and LT FPKM: fragments per kb per million reads for each unigene in the CK and LT libraries, respectively. The log2Ratio (LT/CK): ratio between the FPKM of LT and CK. The absolute values of log2Ratio > 1 and probability > 0.7 were used as threshold for assigning significance. Annotation of DEGs against NR, NT, Swiss-Prot protein, KEGG, COG and GO were all reported in the tables. “-”: no hit. (XLS 381 kb
TagCLIP: A Local-to-Global Framework to Enhance Open-Vocabulary Multi-Label Classification of CLIP Without Training
Contrastive Language-Image Pre-training (CLIP) has demonstrated impressive
capabilities in open-vocabulary classification. The class token in the image
encoder is trained to capture the global features to distinguish different text
descriptions supervised by contrastive loss, making it highly effective for
single-label classification. However, it shows poor performance on multi-label
datasets because the global feature tends to be dominated by the most prominent
class and the contrastive nature of softmax operation aggravates it. In this
study, we observe that the multi-label classification results heavily rely on
discriminative local features but are overlooked by CLIP. As a result, we
dissect the preservation of patch-wise spatial information in CLIP and proposed
a local-to-global framework to obtain image tags. It comprises three steps: (1)
patch-level classification to obtain coarse scores; (2) dual-masking attention
refinement (DMAR) module to refine the coarse scores; (3) class-wise
reidentification (CWR) module to remedy predictions from a global perspective.
This framework is solely based on frozen CLIP and significantly enhances its
multi-label classification performance on various benchmarks without
dataset-specific training. Besides, to comprehensively assess the quality and
practicality of generated tags, we extend their application to the downstream
task, i.e., weakly supervised semantic segmentation (WSSS) with generated tags
as image-level pseudo labels. Experiments demonstrate that this
classify-then-segment paradigm dramatically outperforms other annotation-free
segmentation methods and validates the effectiveness of generated tags. Our
code is available at https://github.com/linyq2117/TagCLIP.Comment: Accepted by AAAI202
Quantitative analysis of multi-components by single marker method combined with UPLC-PAD fingerprint analysis based on saikosaponin for discrimination of Bupleuri Radix according to geographical origin
Background: Saikosaponins are regarded as one of the most likely antipyretic constituents of Bupleuri Radix, establishing a comprehensive method that can reflect both the proportion of all constituents and the content of each saikosaponin is critical for its quality evaluation.Methods: In this study, the combination method of quantitative analysis of multiple components with a single marker (QAMS) and fingerprint was firstly established for simultaneous determination of 7 kinds of saikosaponins in Bupleuri Radix by ultra-high performance liquid chromatography (UPLC).Results: The results showed that saikosaponin d was identified as the optimum IR by evaluating the fluctuations and stability of the relative calibration factors (RCFs) under four different conditions. The new QAMS method has been confirmed to accurately quantify the 7 kinds of saikosaponins by comparing the obtained results with those obtained from external standard method and successfully classify the 20 batches of Bupleuri Radix from 8 provinces of China. The experimental time of fingerprint was significantly reduced to approximate 0.5 h through UPLC-PAD method, a total of 17 common peaks were identified.Conclusion: The QAMS-fingerprint method is feasible and reliable for the quality evaluation of Bupleuri Radix. This method could be considered to be spread in the production enterprises of Bupleuri Radix
Discovery of electromagnetic polarization in Asian rice wine deterioration process and its applications
Rice wine, known as yellow wine in China and Japan, possesses considerable nutritional value and holds significant global influence. This study addresses the challenge of preserving rice wine, which is prone to rancidity due to its low alcohol content. Conventional storage techniques employing pottery jars often result in substantial spoilage losses. Through rigorous investigation, this research identifies a polarization phenomenon exhibited by degraded rice wine when subjected to high-frequency microwaves(>60GHz), presenting a pioneering method for detecting spoilage, even within sealed containers. Employing a multi-channel microwave radar apparatus, the study delves into the susceptibility of rice wine to electromagnetic waves across various frequencies, uncovering pronounced polarization traits in deteriorated samples within the E-band microwave spectrum. Furthermore, lab-controlled simulations elucidate a direct correlation between physicochemical alterations and high-frequency Radar Cross Section (RCS) signals during the wine’s deterioration process. A novel six-membered Hydrated Cluster hypothesis is proposed, offering insights into the molecular mechanisms underlying this phenomenon. Additionally, dielectric property assessments conducted using vector network analyzers (VNA) reveal noteworthy enhancements in the dielectric constant of deteriorated rice wine, particularly within the high-frequency domain, thereby augmenting detectability. These findings carry implications for refining rice wine preservation techniques and contribute to the advancement of non-destructive testing technologies, enabling the detection of rice wine deterioration or indications thereof, even within sealed vessels
Mapping the Distribution of Water Resource Security in the Beijing-Tianjin-Hebei Region at the County Level under a Changing Context
The Beijing-Tianjin-Hebei (Jingjinji) region is the most densely populated region in China
and suffers from severe water resource shortage, with considerable water-related issues emerging
under a changing context such as construction of water diversion projects (WDP), regional synergistic
development, and climate change. To this end, this paper develops a framework to examine the water
resource security for 200 counties in the Jingjinji region under these changes. Thus, county-level
water resource security is assessed in terms of the long-term annual mean and selected typical years
(i.e., dry, normal, and wet years), with and without the WDP, and under the current and projected
future (i.e., regional synergistic development and climate change). The outcomes of such scenarios
are assessed based on two water-crowding indicators, two use-to-availability indicators, and one
composite indicator. Results indicate first that the water resources are distributed unevenly, relatively
more abundant in the northeastern counties and extremely limited in the other counties. The water
resources are very limited at the regional level, with the water availability per capita and per unit
gross domestic product (GDP) being only 279/290 m3 and 46/18 m3
in the current and projected future
scenarios, respectively, even when considering the WDP. Second, the population carrying capacity
is currently the dominant influence, while economic development will be the controlling factor in
the future for most middle and southern counties. This suggests that significant improvement in
water-saving technologies, vigorous replacement of industries from high to low water consumption,
as well as water from other supplies for large-scale applications are greatly needed. Third, the research
identifies those counties most at risk to water scarcity and shows that most of them can be greatly
relieved after supplementation by the planned WDP. Finally, more attention should be paid to the
southern counties because their water resources are not only limited but also much more sensitive and
vulnerable to climate change. This work should benefit water resource management and allocation
decisions in the Jingjinji region, and the proposed assessment framework can be applied to other
similar problems.This study is supported by the National Key Research and Development Program of China
(2016YFC0401401) and the National Natural Science Foundation of China (51609256, 51609122, 51522907, 51739011,
and 51569026). Partial support is also from the Young Elite Scientists Sponsorship Program by the China
Association for Science and Technology (2017QNRC001
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