Publications by authors named "Hongshan Yu"

In this study, icariside II was prepared from icariin by a special enzyme. The yield of the substrate icariin from a powdered extract of the popular herb was 16.9%.

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In this paper, an event-triggered adaptive neural prescribed performance admittance control (ETANPPAC) scheme is proposed to control the constrained robotic systems without velocity sensors. To ensure compliance during human-robot interaction, the reference trajectory is obtained by reshaping the desired trajectory for the robotic systems based on the admittance relationship, where a saturation function is used to constrain the reference trajectory, avoiding excessive contact forces that could render the trajectory inexecutable. Moreover, a barrier Lyapunov function is used to constrain the tracking errors for prescribed performance, where a velocity observer and a radial basis function neural network are designed to estimate the velocity and the uncertainty of the robotic systems, respectively, to enhance control performance.

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Point cloud processing methods exploit local point features and global context through aggregation which does not explicitly model the internal correlations between local and global features. To address this problem, we propose full point encoding which is applicable to convolution and transformer architectures. Specifically, we propose full point convolution (FuPConv) and full point transformer (FPTransformer) architectures.

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Article Synopsis
  • Deep learning excels in computer vision, but needs large labeled datasets, which are costly and hard to gather.
  • This article introduces a self-supervised learning framework that uses a jigsaw puzzle approach to learn from unlabeled data, improving semantic segmentation.
  • The method enhances model performance by 5.8% on the Cityscapes dataset using fewer training images and shows competitive results on the PASCAL VOC2012 dataset with less pretraining time.
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In this study, to obtain icaritin with high pharmacological activities from icariin, which has a content ratio of over 58% in the total flavonoids of herb, a special flavonoid-glycosidase was produced, purified and characterized from sp.y848 strain. The optimal enzyme production was gained in a medium containing 5% (w/v) wheat bran extract and 0.

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Indirect methods for visual SLAM are gaining popularity due to their robustness to environmental variations. ORB-SLAM2 (Mur-Artal and Tardós, 2017) is a benchmark method in this domain, however, it consumes significant time for computing descriptors that never get reused unless a frame is selected as a keyframe. To overcome these problems, we present FastORB-SLAM which is light-weight and efficient as it tracks keypoints between adjacent frames without computing descriptors.

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It is well known that many chronic diseases are associated with unhealthy diet. Although improving diet is critical, adopting a healthy diet is difficult despite its benefits being well understood. Technology is needed to allow an assessment of dietary intake accurately and easily in real-world settings so that effective intervention to manage being overweight, obesity, and related chronic diseases can be developed.

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Semantic segmentation is a key step in scene understanding for autonomous driving. Although deep learning has significantly improved the segmentation accuracy, current highquality models such as PSPNet and DeepLabV3 are inefficient given their complex architectures and reliance on multi-scale inputs. Thus, it is difficult to apply them to real-time or practical applications.

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Background: Notoginseng stem-leaf (NGL) ginsenosides have not been well used. To improve their utilization, the biotransformation of NGL ginsenosides was studied using ginsenosidase type-I from g.848.

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Correction for 'Icariin and icaritin recover UVB-induced photoaging by stimulating Nrf2/ARE and reducing AP-1 and NF-κB signaling pathways: a comparative study on UVB-irradiated human keratinocytes' by Eunson Hwang et al., Photochem. Photobiol.

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Icariin (ICA) and icaritin (ICT) exhibit many pharmacological functions including anti-osteoporosis, anti-cardiovascular, and anti-cancer activities; however, there are few comprehensive studies that track the detailed effects on UVB-induced photoaging. The recovery effects of ICA and ICT were investigated in UVB-irradiated human keratinocytes (HaCaTs). The results indicated that ICT and ICA showed strong radical scavenging activity, and the reactive oxygen species (ROS) scavenging activity of ICT was superior.

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Ginsenoside Rb1 is an important saponin of ginseng(s); however, Rb1, with 3-O- and 20-O-sugar moieties, has low bioavailability. Here, we report the derivatization of ginsenoside Rb1 to completely generate six types of highly bioactive minor ginsenoside Rg3 and its derivatives by FeCl catalysis, the reaction conditions are similar to enzymatic reaction conditions. In FeCl catalysis, the only 20-O-sugar-moiety of ginsenoside Rb1 was decomposed into the minor ginsenosides Rk1 and Rg5 with newly produced C-20 ethylene bands; but also hydrolyzed into 20(S)-Rg3 and 20(R)-Rg3; subsequently the C-24(25) ethylene bands of 20(S)-Rg3 and 20(R)-Rg3 were hydrated to 20(S)-25-OH-Rg3 and 20(R)-25-OH-Rg3.

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Article Synopsis
  • A new bacterium, designated Gsoil 653, was discovered in ginseng cultivating soil and is characterized as a Gram-positive, aerobic, nonmotile, yellowish coccus-rod shape.
  • Phylogenetic analysis revealed that Gsoil 653 is closely related to other species in the genus Terrabacter, showing over 98% similarity to several known strains, but it has low DNA-DNA relatedness, indicating its uniqueness.
  • Based on its genetic and phenotypic characteristics, Gsoil 653 has been proposed as a novel species, named Terrabacter ginsengisoli sp. nov.
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A taxonomic study was conducted on BR7-21, a bacterial strain isolated from the soil of a ginseng field in Baekdu Mountain. Comparative studies of the 16S rRNA gene sequence showed that the isolate was most closely related to Conexibacter woesei DSM 14684, Solirubrobacter pauli ATCC BAA-492, Patulibacter minatonensis JCM 12834, with 93.8%, 92.

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Camera calibration plays a critical role in 3D computer vision tasks. The most commonly used calibration method utilizes a planar checkerboard and can be done nearly fully automatically. However, it requires the user to move either the camera or the checkerboard during the capture step.

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Background: Ginsenoside F1, a pharmaceutical component of ginseng, is known to have antiaging, antioxidant, anticancer, and keratinocyte protective effects. However, the usage of ginsenoside F1 is restricted owing to the small amount found in Korean ginseng.

Methods: To enhance the production of ginsenoside F1 as a 10 g unit with high specificity, yield, and purity, an enzymatic bioconversion method was developed to adopt the commercial enzyme Cellulase KN from Aspergillus niger with food grade, which has ginsenoside-transforming ability.

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A Gram-reaction-negative, aerobic, heterotrophic, non-motile, non-spore-forming, rod-shaped bacterial strain, designated Gsoil 032T, was isolated from soil of a ginseng field in Pocheon Province, South Korea, and its taxonomic position was investigated by using a polyphasic approach. Strain Gsoil 032T grew at 10-42 °C and at pH 5.0-10.

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Strain THG-SQM11(T), a Gram-negative, aerobic, non-motile, coccus-shaped bacterium, was isolated from wheat seedlings plant in P. R. China.

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A Gram-reaction-positive, aerobic, coccus- to rod-shaped, non-motile, non-spore-forming bacterium (strain UKS-03T) was isolated from a sediment sample of Ungok Lake in Gochang, Republic of Korea. The taxonomic position of this bacterium was determined in an investigation based on a polyphasic approach. On the basis of 16S rRNA gene sequence analysis, strain UKS-03T was shown to belong to the family Nocardioidaceae and to be related most closely to Nocardioides ginsengisegetis Gsoil 485T (98.

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A novel bacterial strain THG-MM13(T) was isolated from rhizospheric soil sample and was characterized by using a polyphasic approach. Cells were Gram-reaction-negative, non-motile and rod-shaped. The strain was aerobic, catalase and oxidase positive, and optimum growth temperature and pH were 28 °C and 7.

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A Gram-reaction-negative, aerobic, non-motile and rod-shaped bacterial strain designated Gsoil 636T was isolated from soil of a ginseng cultivation field in Pocheon Province, South Korea and its taxonomic position was investigated using a polyphasic approach. Gsoil 636T grew at 18-30 °C and at pH 6.0-8.

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Strain THG-SQA7(T), a Gram-negative, strictly aerobic, non-motile, rod-shaped bacterium was isolated from rhizosphere soil of a rose in PR China. Strain THG-SQA7(T) is closely related to the members of the genus Sphingobium, showing the highest 16S rRNA gene sequence similarities with Sphingobium lactosutens KACC 18100(T) (98.2%) and Sphingobium abikonense KCTC 2864(T) (98.

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Article Synopsis
  • Strain THG-MD12T is a new species of bacterium isolated from the rhizosphere of Ophiopogon japonicus in China, identified as a member of the genus Pseudoclavibacter.
  • It shows high genetic similarities to Pseudoclavibacter helvolus and Pseudoclavibacter chungangensis, with DNA-DNA hybridization revealing moderate levels of genetic relatedness.
  • Chemotaxonomic analysis indicates specific characteristics like predominant menaquinone-9 and a unique fatty acid composition, supporting the classification of THG-MD12T as Pseudoclavibacter terrae sp. nov.
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Background: Minor ginsenosides, those having low content in ginseng, have higher pharmacological activities. To obtain minor ginsenosides, the biotransformation of American ginseng protopanaxadiol (PPD)-ginsenoside was studied using special ginsenosidase type-I from Aspergillus niger g.848.

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Dietary flavonoids show beneficial effects in the prevention of chronic diseases. However, flavonoid bioavailability is poor, probably due to their interaction with serum albumins. In the current work, the binding interactions of eight related flavonoids, sharing a similar core structure, with bovine serum albumin (BSA) were investigated by fluorescence spectroscopy.

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