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| 1 | SEGREGATION EFFECT ON SURFACE COMPOSITION IN ALLOY SPUTTERING显示文摘The modified dynamic TCIS(Transport and atomic Collision cascade of energetic Ions an Solids)Monte Carlo program including the radiation-enhanced Gibbsian segregation(REGS)is employed to estimate the compositional distributions at surface of the Au_(0.56)Cu_(0.44) alloy under 2keV Ar^(+) ion bombardment at high dose.The calculation results exhibit that the Au composition enriches in the first layer(74 at.%),depletes in the second layer(37 at.%)and gradually rises with depth to the bulk composition.The effect of the relation between sputter depth and segregation layer on the surface concentration of Au_(0.56)Cu_(0.44) is also discussed. | ZHENG Liping LI Risheng LI Mingyao CUI Fuzhai | 1990 | Chinese Physics Letters1990，7，3： | 2 |
| 2 | Near-field wideband channel estimation for extremely large-scale MIMO显示文摘Extremely large-scale multiple-input-multiple-output(XL-MIMO)at millimeter-wave(mm Wave)and terahertz(THz)bands plays an important role in supporting extreme high beamforming gain as well as ultra-wideband spectrum resources.Unfortunately,accurate wideband XL-MIMO channel estimation suffers from a new challenge called the near-field beam split effect.Prior studies either neglect the accurate nearfield channel model or fail to exploit the beam split effect,resulting in poor channel estimation accuracy for wideband XL-MIMO.To tackle this problem,this paper proposes a bilinear pattern detection(BPD)-based approach to accurately recover the wideband XL-MIMO channel.Specifically,by analyzing the characteristics of near-field wideband channels,we first reveal the bilinear pattern of the near-field beam split effect,which implies that the sparse support set of near-field channels in both the angle and the distance domains can be regarded as a linear function against frequency.Then,inspired by the classical simultaneously orthogonal matching pursuit technique,we use the bilinear pattern to estimate the angle-of-arrival(Ao A)and distance parameters of each near-field path component at all frequencies.In this way,the entire wideband XL-MIMO channel can be recovered by compressed sensing algorithms.Moreover,we provide the computational complexity of the proposed algorithm compared with existing algorithms.Finally,simulation results demonstrate that our scheme can achieve the accurate estimation of the near-field wideband XL-MIMO channel in the presence of near-field beam split effect. | Mingyao CUI Linglong DAI | 2023 | Science China(Information Sciences)2023，66，7： | 1 |
| 3 | GPR54 deficiency reduces the Treg population and aggravates experimental autoimmune encephalomyelitis in mice显示文摘GPR54 is highly expressed in the central nervous system and plays a crucial role in pubertal development. However, GRP54 is also expressed in the immune system, implying possible immunoregulatory functions. Here we investigated the role of GPR54 in T cell and immune tolerance. GPR54 deficiency led to an enlarged thymus, an increased number of thymocytes, and altered thymic micro-architecture starting around puberty, indicating GPR54 function in T-cell development through its regulatory effect on the gonadal system. However, flow cytometry revealed a significant reduction in the peripheral regulatory T cell population and a moderate decrease in CD4 single-positive thymocytes in prepubertal Gpr54^(-/-) mice. These phenotypes were confirmed in chimeric mice with GPR54 deficient bone marrow-derived cells. In addition, we found elevated T cell activation in peripheral and thymic T cells in Gpr54^(-/-) mice. When intact mice were immunized with myelin oligodendrocyte glycoprotein, a more severe experimental autoimmune encephalomyelitis(EAE) developed in the Gpr54^(-/-) mice. Interestingly, aggravated EAE disease was also manifested in castrated and bone marrow chimeric Gpr54^(-/-) mice compared to the respective wild-type control,suggesting a defect in self-tolerance resulting from GPR54 deletion through a mechanism that bypassed sex hormones. These findings demonstrate a novel role for GPR54 in regulating self-tolerant immunity in a sex hormone independent manner. | Roumei Xing Fang Liu Yiqing Yang Xueqin Cui Tongtong Wang Ling Xie Yongliang Zhao Lei Fang Tingfang Yi Biao Zheng Mingyao Liu Huaqing Chen | 2018 | Science China(Life Sciences)2018，61，6： | 1 |
| 4 | Continuous-Time Channel Prediction Based on Tensor Neural Ordinary Differential Equation显示文摘Channel prediction is critical to address the channel aging issue in mobile scenarios.Existing channel prediction techniques are mainly designed for discrete channel prediction,which can only predict the future channel in a fixed time slot per frame,while the other intra-frame channels are usually recovered by interpolation.However,these approaches suffer from a serious interpolation loss,especially for mobile millimeter-wave communications.To solve this challenging problem,we propose a tensor neural ordinary differential equation(TN-ODE)based continuous-time channel prediction scheme to realize the direct prediction of intra-frame channels.Specifically,inspired by the recently developed continuous mapping model named neural ODE in the field of machine learning,we first utilize the neural ODE model to predict future continuous-time channels.To improve the channel prediction accuracy and reduce computational complexity,we then propose the TN-ODE scheme to learn the structural characteristics of the high-dimensional channel by low-dimensional learnable transform.Simulation results show that the proposed scheme is able to achieve higher intra-frame channel prediction accuracy than existing schemes. | Mingyao Cui Hao Jiang Yuhao Chen Yang Du Linglong Dai | 2024 | China Communications2024，21，1： | 0 |
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