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Is Amyloid-Related Toxicity an Inevitable Consequence of Ageing?
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A simplified reverse beamforming algorithm based on simplex downhill optimization method for DS/CDMA Communication
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학교에서의 방과후 프로그램에 대한 참여 학생의 평가 = Student Participants’ Evaluation on After School Learning Programs
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Association between Multiple Sclerosis and Cystic Structures in Cerebrospinal Fluid
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Information and management . v.4(1981)
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Update on omicron variant: What we know so far
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- 저자 : Feihu Liu (검색결과 3 건)
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Feihu Liu,Dengyun Yu,Cong Wang,Guangyuan Wang 한국항공우주학회 2024 International Journal of Aeronautical and Space Sc Vol.25 No.2
Optical imaging spacecraft needs adaptable vibration isolators to convey maneuvering forces stably and attenuate disturbances effectively, especially under multiple-level on-orbit working conditions. This paper proposes an active–passive integrated variable stiffness vibration isolator (API-VSVI), which employs a heterogeneous-signal fixed-step least mean square (HS- FSLMS) algorithm, to provide the necessary adaptability. Furthermore, the actuator’s capacity requirements can be further optimized based on the stiffness adjustment method. The API-VSVI prototype was firstly introduced, and the dynamic model was subsequently developed based on the derived equation of the stiffness. Then, the HS-FSLMS algorithm was proposed to simultaneously process the displacement and force signals for two different goals concerning different frequency bands. Through the comparative study of parameters, the appropriate range of the dynamic and control parameters was analyzed, following which one stiffness adjustment method was proposed according to the discussion on multilevel input modes. Finally, it was demonstrated by experiment results that the API-VSVI outperformed the VSVI in shaping the transmitted force. It appears that the maneuvering force amplification is actively regulated at less than 4%, and the disturbance suppression is improved to 92.7% by lowering the stiffness and then actively controlled to 98.5%.
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Robust Vehicle-Infrastructure Localization Using Factor Graph and Probability Data Association
Feihu Zhang,Mingyong Liu,Dhiraj Gulati,Alois Knoll 한국통신학회 2018 Journal of communications and networks Vol.20 No.4
This paper presents a robust graph-based optimizationframework for vehicle-infrastructure cooperative localization. Compared to the state-of-the-art approaches, the proposed solutionkeeps high performance in presence of unknown data associationenvironments. In this paper, the association probability of eachmeasurement is calculated, and then assigned to the correspondingedges on the graph, in which the nonlinear least square method isutilized to optimize the state. Thus the proposed approach presentsa robust framework in the presence of high association uncertaintyduring vehicle-infrastructure cooperative localization, in which thecorresponding weights from outliers are lower than the true vehicles. The experimental results demonstrate the good robustness insimulated data.
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Xiaowei Ding,Kaihui Liu,Yonggui Zhang,Feihu Liu 한국미생물학회 2017 The journal of microbiology Vol.55 No.11
In the present study, we identified genes that are putatively involved in the production of fungal 10-hydroxycamptothecin via transcriptome sequencing and characterization of the Xylaria sp. M71 treated with salicylic acid (SA). A total of 60,664,200 raw reads were assembled into 26,044 unigenes. BLAST assigned 8,767 (33.7%) and 10,840 (41.6%) unigenes to 40 Gene Ontology (GO) annotations and 108 Kyoto Encyclopedia of Genes and Genomes (KEGG) pathways, respectively. A total of 3,713 unigenes comprising 1,504 upregulated and 2,209 downregulated unigenes were found to be differentially expressed between SA-induced and control fungi. Based on the camptothecin biosynthesis pathway in plants, 13 functional genes of Xylaria sp. M71 were mapped to the mevalonate (MVA) pathway, suggesting that the fungal 10-hydroxycamptothecin is produced via the MVA pathway. In summary, analysis of the Xylaria sp. M71 transcriptome allowed the identification of unigenes that are putatively involved in 10-hydroxycamptothecin biosynthesis in fungi.
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