RISS 학술연구정보서비스

검색
다국어 입력

http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.

변환된 중국어를 복사하여 사용하시면 됩니다.

예시)
  • 中文 을 입력하시려면 zhongwen을 입력하시고 space를누르시면됩니다.
  • 北京 을 입력하시려면 beijing을 입력하시고 space를 누르시면 됩니다.
닫기
    인기검색어 순위 펼치기

    RISS 인기검색어

      검색결과 좁혀 보기

      선택해제
      • 좁혀본 항목 보기순서

        • 원문유무
        • 원문제공처
        • 등재정보
          펼치기
        • 학술지명
          펼치기
        • 주제분류
        • 발행연도
          펼치기
        • 작성언어

      오늘 본 자료

      • 오늘 본 자료가 없습니다.
      더보기
      • 무료
      • 기관 내 무료
      • 유료
      • A Single-Stage High-Frequency-Link Microinverter with Split-Phase Structure

        Xuewen Li,Jia Liu,Guozhong Zhu,Fangchao Ji,Jianyue Di,Yue Wang,Jinjun Liu 전력전자학회 2023 ICPE(ISPE)논문집 Vol.2023 No.-

        High-frequency link (HFL) inverters have drawn a lot of attention as a promising structure, owing to their high transformer utilization factor, bidirectional energy transfer, and easy implementation of soft switching. However, the use of HFI structures in split-phase systems is rarely studied. Therefore, a novel single-stage high-frequency link microinverter with a split-phase structure is proposed in this paper. The proposed microinverter can provide two different output-voltage levels matching the single-phase three-wire power system. The output voltages of the two phases can be balanced naturally without dedicated control. It has grid-forming capability, which can be used in both grid-connected applications and islanded applications. With a secondary-side modulation (SSM) strategy, zero-voltage switching (ZVS) can be realized in the proposed microinverter. A 600-W prototype is established, and the experimental and simulation results verify the proposed microinverter.

      • KCI등재

        A drug delivery system constructed by a fusion peptide capturing exosomes targets to titanium implants accurately resulting the enhancement of osseointegration peri-implant

        Li Xuewen,Liu Zihao,Xu Shendan,Ma Xinying,Zhao Zhezhe,Hu Han,Deng Jiayin,Peng Cheng,Wang Yonglan,Ma Shiqing 한국생체재료학회 2023 생체재료학회지 Vol.27 No.00

        Exosomes derived from bone marrow mesenchymal stem cells (BMSC-exos) have been shown triggering osteogenic differentiation and mineralization of MSCs, but exosomes administered via bolus injections are rapidly sequestered and cleared. Therefore, we considered the implant as a new organ of patient’s body and expected to find a method to treat implant with BMSC-exos in vivo directly.A fusion peptide (PEP), as a drug delivery system (DDS) which contained a titanium-binding peptide (TBP) possessing the ability to selectively bind to the titanium surface and another peptide CP05 being able to capture exosomes expertly, is constructed to modify the titanium surface.Both in vitro and in vivo experiments prove PEP retains the ability to bind titanium and exosome simultaneously, and the DDS gain the ability to target exosomes to titanium implants surface following enhancing osseointegration post-implantation. Moreover, the DDS constructed by exosomes of diverse origins shows the similar combination rate and efficiency of therapy.This drug delivery system demonstrates the concept that EXO-PEP system can offer an accurate and efficient therapy for treating implants with long-term effect.

      • KCI등재

        Design and simulation for a hydraulic actuated quadruped robot

        Xuewen Rong,Yibin Li,Jiuhong Ruan,Bin Li 대한기계학회 2012 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.26 No.4

        This paper describes the mechanical configuration of a quadruped robot firstly. Each of the four legs consists of three rotary joints. All joints of the robot are actuated by linear hydraulic servo cylinders. Then it deduces the forward and inverse kinematic equations for four legs with D-H transformation matrices. Furthermore, it gives a composite foot trajectory composed of cubic curve and straight line,which greatly reduces the velocity and acceleration fluctuations of the torso along forward and vertical directions. Finally, dynamics cosimulation is given with MSC.ADAMS and MATLAB. The results of co-simulation provide important guidance to mechanism design and parameters preference for the linear hydraulic servo cylinders.

      • KCI등재

        Review on the research of contact parameters calibration of particle system

        Xuewen Wang,Haozhou Ma,Bo Li,Tiejun Li,Rui Xia,Qingbao Bao 대한기계학회 2022 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.36 No.3

        With the widespread application of the discrete element method, research on accurate simulation of particle systems has attracted significant attention. However, there is no accurate process for the parameter calibration of particle systems. Most calibrations use a direct measurement method or test-simulation combined calibration method. Both methods have their advantages and disadvantages. This study reviews the calibration of contact parameters of particle systems, introduces the main calibration methods of different contact parameters, and summarizes the advantages and disadvantages of two main measurement methods. For the parameter measurement of particle systems, the accurate representation of particle shape and the reasonable optimization of simulation time are still not perfect. Furthermore, the correction of parameters after calibration applied to subsequent simulation needs further discussion.

      • KCI등재후보

        SODIUM TANTALATE SPHERES PREPARED VIA AN ELECTROCHEMICAL PROCESS AND THEIR PHOTOELECTROCHEMICAL BEHAVIOR

        XUEWEN WANG,LI ZHOU 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2013 NANO Vol.8 No.3

        Photocatalytic activity can be improved through modified morphology and structure. Sodium tantalate (NaTaO3) as a semiconductor photocatalyst is extensively used for photocatalytic water splitting. A novel electrochemical route was developed for preparing NaTaO3 spheres. The method can easily and fast synthesize high pure phase NaTaO3 spheres at room temperature. The NaTaO3 sphere structure consists of a crystalline core and an amorphous shell. After a thermal treatment, the NaTaO3 spheres show an enhanced photoelectrochemical water splitting ability.

      • KCI등재

        Differential Profile of Plasma Circular RNAs in Type 1 Diabetes Mellitus

        Yangyang Li,Ying Zhou,Minghui Zhao,Jing Zou,Yuxiao Zhu,Xuewen Yuan,Qianqi Liu,Hanqing Cai,Cong-Qiu Chu,Yu Liu 대한당뇨병학회 2020 Diabetes and Metabolism Journal Vol.44 No.6

        Background No currently available biomarkers or treatment regimens fully meet therapeutic needs of type 1 diabetes mellitus (T1DM). Circular RNA (circRNA) is a recently identified class of stable noncoding RNA that have been documented as potential biomarkers for various diseases. Our objective was to identify and analyze plasma circRNAs altered in T1DM. Methods We used microarray to screen differentially expressed plasma circRNAs in patients with new onset T1DM (n=3) and age-/gender-matched healthy controls (n=3). Then, we selected six candidates with highest fold-change and validated them by quantitative real-time polymerase chain reaction in independent human cohort samples (n=12). Bioinformatic tools were adopted to predict putative microRNAs (miRNAs) sponged by these validated circRNAs and their downstream messenger RNAs (mRNAs). Gene Ontology (GO) and Kyoto Encyclopedia of Genes and Genomes (KEGG) pathway analyses were performed to gain further insights into T1DM pathogenesis. Results We identified 68 differentially expressed circRNAs, with 61 and seven being up- and downregulated respectively. Four of the six selected candidates were successfully validated. Curations of their predicted interacting miRNAs revealed critical roles in inflammation and pathogenesis of autoimmune disorders. Functional relations were visualized by a circRNA-miRNA-mRNA network. GO and KEGG analyses identified multiple inflammation-related processes that could be potentially associated with T1DM pathogenesis, including cytokine-cytokine receptor interaction, inflammatory mediator regulation of transient receptor potential channels and leukocyte activation involved in immune response. Conclusion Our study report, for the first time, a profile of differentially expressed plasma circRNAs in new onset T1DM. Further in silico annotations and bioinformatics analyses supported future application of circRNAs as novel biomarkers of T1DM.

      • KCI등재후보

        ELECTRONIC STRUCTURES AND TRANSPORT PROPERTIES OF SINGLE CRYSTALLINE GaN NANOTUBES

        ENLING LI,LIPING HOU,ZHEN CUI,DANNA ZHAO,MANCANG LIU,XUEWEN WANG 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2012 NANO Vol.7 No.3

        The electronic structures and transport properties of single crystalline GaN nanotubes with 0.92nm inner diameter and di®erent wall thicknesses of 0.08 nm, 0.26 nm and 0.54 nm are studied based on the generalized gradient approximation (GGA) of density functional theory (DFT) and the nonequilibrium green's function (NEGF). The research shows that (1) the three single crystalline GaN nanotubes have direct band gaps, decreasing with the increase of wall thickness;(2) the electronic density of state and electronic transmission spectra of two-probe system have their own pulse-type sharp peaks with almost the same location of electron energy; (3) under di®erent bias-voltages, two-probe systems of the single crystalline GaN nanotubes have the I?V properties which reveal that the single-wall GaN nanotube and the single-layer GaN nanotube are semiconducting and the double-layer GaN nanotube appears nearly metallic.

      • KCI등재

        Design and control method of a hydraulic power unit for a wheel-legged robot

        Zemin Cui,Xuewen Rong,Yibin Li 대한기계학회 2022 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.36 No.4

        For a hydraulic wheel-legged robot (WLR), it is essential to have a powerful and lightweight power supply. In this paper, a compact hydraulic power unit (HPU) is developed, and a control method to reduce the energy consumption of the robot is proposed. To achieve a high jump of the robot, an accumulator serves as an auxiliary oil source. To reduce the pressure loss caused by the throttle of the servo valve, we control the pressure of the system through load sensing. Simulation results showed that the power of the HPU using the accumulator could be amplified 3.3 times. The experimental results obtained through physical testing showed that the power consumption of the system using the load sensing mechanism was reduced by more than 50 %.

      • KCI등재

        A free gait generation method for quadruped robots over rough terrains containing forbidden areas

        Shuaishuai Zhang,Xuewen Rong,Yi-bin Li,Bin Li 대한기계학회 2015 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.29 No.9

        Planning a robust gait is one of the most basic aspects to enable a quadruped robot to walk stably on rough terrains. In this paper, wefocus on the scenario where a quadruped robot travelling on the rough terrains containing forbidden areas, and a free gait generationmethod for quadruped robot is proposed. Under the assumption that a set of the positions which can be selected as the foothold is given,the quadruped robot can select the swing foot sequence and choose the best foothold for the swing foot automatically. A body sway motionis included into the motion planning of the free gait to enlarge the stability margin of the robot. With the aid of the sway motion, thestability margin of the robot is no less than the minimum stability margin during the whole walking process. In order to guarantee thelocomotion continuity of the quadruped robot, a COG trajectory which has continuous velocity and acceleration profiles is automaticallygenerated. Moreover, the locomotion speed of the robot is improved by ensuring the kinematic margin of the selected swing foot to bezero just before this foot lift-off the ground. With the free gait generation method proposed in this paper, the robot can autonomouslynavigate through rough terrains as soon as possible on the condition that the robot has enough stability margin. The simulation resultsshow the correctness and effectiveness of the proposed method.

      • Acetylation of Smc3 by Eco1 Is Required for S Phase Sister Chromatid Cohesion in Both Human and Yeast

        Zhang, Jinglan,Shi, Xiaomin,Li, Yehua,Kim, Beom-Jun,Jia, Junling,Huang, Zhiwei,Yang, Tao,Fu, Xiaoyong,Jung, Sung Yun,Wang, Yi,Zhang, Pumin,Kim, Seong-Tae,Pan, Xuewen,Qin, Jun Elsevier 2008 Molecular cell Vol.31 No.1

        <P><B>Summary</B></P><P>Sister chromatid cohesion is normally established in S phase in a process that depends on the cohesion establishment factor Eco1, a conserved acetyltransferase. However, due to the lack of known in vivo substrates, how Eco1 regulates cohesion is not understood. Here we report that yeast Eco1 and its human ortholog, ESCO1, both acetylate Smc3, a component of the cohesin complex that physically holds the sister chromatid together, at two conserved lysine residues. Mutating these lysine residues to a nonacetylatable form leads to increased loss of sister chromatid cohesion and genome instability in both yeast and human. In addition, we clarified that the acetyltransferase activity of Eco1 is essential for its function. Our study thus identified a molecular target for the acetyltransferase Eco1 and revealed that Smc3 acetylation is a conserved mechanism in regulating sister chromatid cohesion.</P>

      연관 검색어 추천

      이 검색어로 많이 본 자료

      활용도 높은 자료

      해외이동버튼