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A pendulum-like tuned vibration absorber and its application to a multi-mode system
XingLong Gong,Chao Peng,ShouHu Xuan,Yulei Xu,Zhenbang Xu 대한기계학회 2012 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.26 No.11
This paper presents the design of a pendulum-like adaptive tuned vibration absorber (ATVA) and its application to a multi-mode system. The natural frequency of the pendulum-like ATVA can be adjusted in real time by adjusting its geometric parameters. The principle and the dynamic property of the ATVA are theoretically analyzed. Based on the analysis, a prototype of the ATVA is proposed and developed. Simulations are carried out to predict the effectiveness of the ATVA when applied to the multi-mode system. The simulated results are verified by experimental studies, which are conducted on a multi-mode platform that comprises mass, isolator, and a flexible base. The results indicate that the ATVA installed on an optimized location in the system can effectively reduce vibration over a broad frequency range and can perform better than a tuned vibration absorber.
Functional mechanisms for diabetic nephropathy-associated genetic variants
Hong Xu,Chengxin Gong,Yonghu Xu,Yongfang Fan,Xingzi Liu,Chaopeng Xiong,Luling He,Changle Liu,Shenqiang Rao,Wen Xiao,Lu Ding,Lan Tang,Fangfang Hu,Mengqi Xiong,Mei Yang,Shangdong Liang 한국유전학회 2016 Genes & Genomics Vol.38 No.7
Diabetic nephropathy (DN) is one of the major complications of diabetes. A tremendous amount of genetic variations have been identified to be associated with DN. However, most of them only generate from statistical associations at the DNA level, generally without direct functional evidence regarding their association mechanisms underlying DN. Based on the publicly available datasets and resources, this study performed integrative analyses (expression quantitative trait loci analysis, differential gene expression analysis and functional prediction analysis) to detect the molecular functional mechanisms underlying the associations for DN. Among 150 selected (P\E-4) genetic associations that were archived in the public databases, two single nucleotide polymorphisms (SNPs) (rs3135377 and rs9469220) have been found to act as cis-effect regulators of the ‘‘identified’’ gene (HLADRA and HLA-DRB1). These eQTL genes have differential expression signals in the DN-associated cell groups. These SNPs were predicted as regulatory sites by utilizing online prediction tools. Our data suggest potential mechanistic links underlying the association between DN and two identified SNPs. These results could help us to have a deeper understanding of the functional relevance of genetic variants with susceptibility to DN, which is useful for pursuit of in-depth validation studies to dissect their involvements and molecular functional mechanisms in DN.
Peng, Xu,Yu, Le,Gong, Kaiyue,Liu, Xiaohan,Yang, Guolong,Xu, Jiangjun,Zhou, Chao,Gao, Lixia,Zhu, Xinyu The Korean Institute of Power Electronics 2021 JOURNAL OF POWER ELECTRONICS Vol.21 No.8
An aircraft ground power unit (GPU) can replace the auxiliary power unit (APU) in an aircraft while the aircraft is parked at an airport. Therefore, the problems associated with the oil consumption and air pollution of the APU are solved. However, the GPU is faced with challenges in terms of utilization, power quality, and fault tolerance. Thus, a novel centralized aircraft GPU based on a three-level neutral point clamped cascaded converter (3LNPC-CC) is introduced in this paper to improve utilization and power quality. Furthermore, an evaluation voltage balance strategy is proposed for the DC-port fault tolerance of the 3LNPC-CC. In addition, both the modulation of the phase shift pulse width modulation (PSPWM) and the control of the double closed loop are used in the 3LNPC-CC. A simulation platform including the control, modulation, and fault tolerance of the system is established to verify the feasibility and performance of the proposed GPU. In particular, it is used to evaluate the voltage balance strategy for DC-port faults. Moreover, a prototype of the GPU and relevant experiments are completed to verify the correctness and feasibility of the system and the strategy.
Haidi Xu,Yuanshan Li,Baoqiang Xu,Yi Cao,Xi Feng,Mengmeng Sun,Maochu Gong,Yaoqiang Chen 한국공업화학회 2016 Journal of Industrial and Engineering Chemistry Vol.36 No.-
FeWx/Ce0.68Zr0.32O2 (x = 0, 0.35, 0.7, 1.03, 1.38) catalysts with different molar ratios (x) of W/Fe wereprepared for NH3-SCR. The experimental results showed that catalytic performances of catalysts wereobviously improved by adjusting the molar ratio of W/Fe. FeW1.03/Ce0.68Zr0.32O2 catalyst with W/Fe of1.03 displayed the best catalytic performance, it could obtain higher than 95% NOx conversion and nearly100% N2 selectivity in the temperature range of 250–435 8C. The characterization results indicated thatmore active species of Fe3+, chemical adsorbed oxygen species and surface acid sites would togethercontribute to the excellent NH3-SCR performance of FeW1.03/Ce0.68Zr0.32O2 catalyst.
On Translation Competence -An Approach in the Light of Mother Tongue Acquisition
GONG Ying-rui,XU Li-na 한국어문화교육학회 2017 한국어문화교육 Vol.11 No.1
본 논문은 모국어 습득의 연구 성과를 이용하여 문법번역과 직업번역 간의 구별을 검토하였다. 문법번역은 외국어 습득에 있어서 학습을 보조하는 도구이다. 하지만, 직업번역은 두 언어 사이에서 교제하는 도구이다. 이 두 가지 다른 성질을 가지는 번역 사이에서 대응 관계와 모국어 습득은 발전 단계상 유사점이 있다. 언어 습득 및 번역 기능 습득을 이해하는 과정은 학생 번역자에게 이성적으로 번역 전략을 운용하여 문제를 해결하는 능력을 양성하는 데 도움이 된다. The paper explores the fundamental differences between grammatical translation and professional translation in the light of mother tongue acquisition. The former serves as a tool for foreign language learning and the latter for communication between two mutually incomprehensible tongues. The two types of translating performance come into a relay relationship, which has something in common with the developments of mother tongue acquisition. A rational exposure to what happens in translating and language learning provides student translators with a strategic approach to the solutions desired for their daily performance.
Xu-Lei Fan,Ya-Jun Gong,Peng-Yan Chen,Qing-Qing Tan,Jiang-Li Tan,Shu-Jun Wei 한국응용곤충학회 2017 Journal of Asia-Pacific Entomology Vol.20 No.3
For the first time the mitochondrial genome of a Dolichovespula species, D. panda Archer (Hymenoptera: Vespidae), was sequenced with a next-generation sequencing approach. The sequenced mitochondrial genome is 17137 bp long and consists of 13 protein-coding, 22 tRNA and two rRNA genes, as well as a partial A +T-rich region. Twenty-two of the genes are encoded on the majority strand and 15 genes on the minority strand. All protein-coding genes start with ATN codons and have a TAA termination codon, except for one with a TA codon. Compared with the putative ancestral arrangement of insects, the D. panda mitochondrial genome shows the shuffling of trnN and trnE, and of trnQ and trnM, the translocation of trnY to upstream of trnI, and of trnL1 to the region between trnS2 and nad1 and a reversal of trnS1. A phylogenetic tree within the Vespidae was reconstructed using the 13 protein-coding mitochondrial genes. This shows a sister group relationship between Dolichovespula and a clade formed by Vespa and Vespula. It also corroborated the position of Eumeninae as sister group of the clade Polistinae +Vespinae.
Xu Han,Xianhao Wang,Chong Chen,Gong Li,Chang-hao Piao 한국정보처리학회 2023 Journal of information processing systems Vol.19 No.6
The manual inspection of photovoltaic (PV) panels to meet the requirements of inspection work for large-scalePV power plants is challenging. We present a hot spot detection and positioning method to detect hot spots inbatches and locate their latitudes and longitudes. First, a network based on the YOLOv3 architecture wasutilized to identify hot spots. The innovation is to modify the RU_1 unit in the YOLOv3 model for hot spotdetection in the far field of view and add a neural network residual unit for fusion. In addition, because of themisidentification problem in the infrared images of the solar PV panels, the DeepLab v3+ model was adoptedto segment the PV panels to filter out the misidentification caused by bright spots on the ground. Finally, thelatitude and longitude of the hot spot are calculated according to the geometric positioning method utilizingknown information such as the drone's yaw angle, shooting height, and lens field-of-view. The experimentalresults indicate that the hot spot recognition rate accuracy is above 98%. When keeping the drone 25 m off theground, the hot spot positioning error is at the decimeter level.