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An Optical Graphene-silicon Resonator Phase Shifter Suitable for Universal Linear Circuits
Changling Liu,Jianping Wang,Hongyao Chen,Zizheng Li 한국광학회 2022 Current Optics and Photonics Vol.6 No.1
This paper describes the construction of a phase shifter with low loss and small volume. To construct it, we use the two graphene layers that are separated by a hexagonal boron nitride (hBN) and embedded in a silicon waveguide. The refractive index of the waveguide is adjusted by applying a bias voltage to the graphene sheet to create an optical phase shift. This waveguide is a compact device that only has a radius of 5 μm. It has a phase shift of 6π. In addition, the extinction ratio (ER) is 11.6 dB and the inser-tion loss (IL) is 0.031 dB. Due to its unique characteristics, this device has great potential in silicon onchip optical interconnection and all-optical multiple-input multiple-output processing.
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Gravity balance mechanism for a spatial robotic manipulator
Yanyan Chen,Yubin Liu,Changle Li,Gangfeng Liu,Yanhe Zhu,Jie Zhao,Hegao Cai 대한기계학회 2016 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.30 No.2
A gravity balance mechanism for spatial robotic manipulator is proposed. In this design, a parallelogram linkage mechanism, pulleys and springs are utilized to accomplish the balance. As a passive structure, it needs no motors or actuators, and safety is another great highlight of the mechanism. The balance mechanism can solve the balance problem of both planar 2-link mechanism and spatial 2-link mechanism (a roll-pitch-yaw-roll 2-link mechanism) by adding a rotational degree of freedom. This is a more simple and effective method to solve the balance problem of spatial linkage system, especially the linkage system of multi-degree of freedom joint. And the mechanism can be extended to solve a multilink balance problem.
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Performance Analysis of IEEE 802.15.4e Time Slotted Channel Hopping for Low-Rate Wireless Networks
( Shuguang Chen ),( Tingting Sun ),( Jingjing Yuan ),( Xiaoyan Geng ),( Changle Li ),( Sana Ullah ),( Mohammed Abdullah Alnuem ) 한국인터넷정보학회 2013 KSII Transactions on Internet and Information Syst Vol.7 No.1
The release of IEEE 802.15.4e specification significantly develops IEEE 802.15.4. The most inspiring improvement is the enhancement for medium access control (MAC) sublayer. To study the performance of IEEE 802.15.4e MAC, in this paper we first present an overview of IEEE 802.15.4e and introduce three MAC mechanisms in IEEE 802.15.4e. And the major concern here is the Time Slotted Channel Hopping (TSCH) mode that provides deterministic access and increases network capacity. Then a detailed analytical Markov chain model for TSCH carrier sense multiple access with collision avoidance (CSMA-CA) is presented. Expressions which cover most of the crucial issues in performance analysis such as the packet loss rate, energy consumption, normalized throughput, and average access delay are presented. Finally the performance evaluation for the TSCH mode is given and we make a comprehensive comparison with unslotted CSMA-CA in non-beacon enabled mode of IEEE 802.15.4. It can validate IEEE 802.15.4e network can provide low energy consumption, deterministic access and increase network capacity.
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An Efficient Downlink MAC Protocol for Multi-User MIMO WLANs
( Kui Liu ),( Changle Li ),( Chao Guo ),( Rui Chen ) 한국인터넷정보학회 2017 KSII Transactions on Internet and Information Syst Vol.11 No.9
Multi-User Multiple-Input Multiple-Output (MU-MIMO) technology has recently attracted significant attention from academia and industry because of it is increasingly important role in improving networks` capacity and data rate. Moreover, MU-MIMO systems for the Fifth Generation (5G) have already been researched. High Quality of Service (QoS) and efficient operations at the Medium Access Control (MAC) layer have become key requirements. In this paper, we propose a downlink MU-MIMO MAC protocol based on adaptive Channel State Information (CSI) feedback (called MMM-A) for Wireless Local Area Networks (WLANs). A modified CSMA/CA mechanism using new frame formats is adopted in the proposed protocol. Specifically, the CSI is exchanged between stations (STAs) in an adaptive way, and a packet selection strategy which can guarantee a fairer QoS for scenarios with differentiated traffic is also included in the MMM-A protocol. We then derive the expressions of the throughput and access delay, and analyze the performance of the protocol. It is easy to find that the MMM-A protocol outperforms the commonly used protocols in terms of the saturated throughput and access delay through simulation and analysis results.
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Qian Yexiong,Ren Qiaoyu,Jiang Lingyu,Zhang Jing,Chen Changle,Chen Liang 한국식물생명공학회 2020 Plant biotechnology reports Vol.14 No.3
Methyl-CpG-binding domain (MBD) proteins in plants are important trans-acting factors specifically recognizing methylated DNA. The MBD proteins can compact chromatins to repress transcription by recruiting chromatin-modifying complexes that contain histone deacetylase activities and chromatin remodeling factors, and play a crucial biological role in the growth and development in plants. Currently, very little is known regarding the structure and function of MBD genes in plants. In this study, we performed a genome-wide identification and expression profile analysis of maize MBD genes (ZmMBDs) from the latest version of the maize (B73) genome. By analyzing phylogenetic relationship of MBD gene families from Arabidopsis, rice, wheat, and maize, all 14 MBD proteins in maize were categorized into four subclasses. Furthermore, chromosome location and schematic structure revealed an unevenly distribution on chromosomes and structure features of MBD genes in maize, respectively. Eventually, EST expression data mining, microarray data clustering analysis, and semi-quantitative and quantitative expression profile analyses detected in seedling leaves and stems by heat, drought, and salt-stress treatments have demonstrated that these genes had temporal and spatial expression pattern and exhibited different expression levels under heat, drought, and salt-stress conditions, suggesting that functional diversification of the MBD gene family in maize. In addition, through electrophoretic mobility shift assay (EMSA) a representative MBD protein, ZmMBD11, exhibited in vitro DNA-binding activity, indicating that that the MBD proteins in maize might play a role in reading cytosine methylation. Taken together, these results would provide an important theoretical basis for future functional verification of ZmMBD genes and also facilitate future experimental research to further unravel the mechanisms of epigenetic regulation in plants.
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