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| 1 | A numerically stable coupled-mode formulation for acoustic propagation in range-dependent waveguides显示文摘In this paper,a stepwise coupled-mode model with the use of the direct global matrix approach is proposed.This method is capable of handling two-dimensional problems with either a point source in cylindrical geometry or a line source in plane geometry.With the use of the direct global matrix approach,this method is numerically stable.In addition,by introducing appropriately normalized range solutions,this model is free from the numerical overflow problem.Furthermore,we put forward source conditions appropriate for the line-source problem in plane geometry.As a result,this method is capable of addressing the scenario with a line source on top of a sloping bottom.Closed-form expressions for coupling matrices are derived and applied in this paper for handling problems with pressure-release boundaries and a homogeneous water column.The numerical simulations indicate that the proposed model is accurate,efficient,and numerically stable.Consequently,this model can serve as a benchmark model in range-dependent propagation modeling.Although this method is verified by an ideal wedge problem in this paper,the formulation applies to realistic problems as well. | LUO WenYu YANG ChunMei QIN JiXing ZHANG RenHe | 2012 | Science China(Physics,Mechanics & Astronomy)2012，55，4： | 13 |
| 2 | Robust secure transmission for multiuser MISO systems with probabilistic QoS constraints显示文摘This paper considers a unicast multiuser multiple-input single-output(MISO) downlink system overheard by multiple single-antenna eavesdroppers. The objective is to jointly design the beamforming vectors and the artificial noise(AN) covariance matrix with imperfect channel state information(CSI) at the transmitter,such that the total transmit power is minimized while satisfying probabilistic quality of service(Qo S) constraints at legitimate users and the eavesdroppers. Using Bernstein-type inequalities and the S-procedure, we recast the non-convex power minimization problem as two different convex semidefinite programs(SDPs) which can be solved using interior-point methods. Simulation results show that the proposed methods outperform a nonrobust method and the ones using the isotropic AN. | Lijian ZHANG Liang JIN Wenyu LUO Chunming WANG Yanqun TANG | 2016 | Science China(Information Sciences)2016，59，2： | 7 |
| 3 | Experimental analysis on air-to-water sound transmission loss in shallow water显示文摘The research of propagation characteristics of air-to-water sound transmission is of great importance to the detection of aerial targets from underwater.In order to study the propagation characteristics of air-to-water sound transmission in shallow water,State Key Laboratory of Acoustics,Institute of Acoustics,conducted an experiment in the South China Sea in March,2013.During the experiment,multi-frequency signals transmitted by a hooter hung on a research ship were received by an underwater hydrophone,and the distance between the hooter and the hydrophone was from 2.4 km to 9.8 km approximately.Through analyzing experimental data in this work,the experimental air-to-water transmission loss at frequencies128 Hz and 256 Hz is estimated up to 9.8 km in range,and its oscillation structure is evident.The wave-number integration approach is used to simulate theoretical air-to-water transmission losses,which are in good agreement with experimental values and to explain the experimental air-to-water sound transmission characteristics. | ZHANG Lingshan PENG Zhaohui WANG Guangxu LUO Wenyu | 2017 | Chinese Journal of Acoustics2017，36，2： | 7 |
| 4 | Transport Accessibility and Spatial Connections of Cities in the Guangdong-Hong Kong-Macao Greater Bay Area显示文摘Based on geographic information system(GIS) spatial analysis technology, the spatial pattern of raster grid transport accessibility for the Guangdong-Hong Kong-Macao Greater Bay area was studied and the states of spatial connectedness were simulated using highway passenger transport, railway passenger transport, port passenger transport and aviation passenger transport data. The result shows that transport accessibility within the Guangdong-Hong Kong-Macao Greater Bay area costs ‘one hour’ and the spatial distribution of accessibility in the area presents clear ‘core-periphery’ spatial characteristics, with Guangzhou, Foshan, Shenzhen constituting the core. The transport accessibility of Guangdong-Hong Kong-Macao is high. Average accessibility of urban nodes as measured by travel time is 0.99 h, and the areas accessible within 1.42 h occupy 79.14% of the total area. Most of the areas with the lowest accessibility are found in the peripheral area, with the worst accessibility being 4.73 h. Compared with the west-side cities, the economically developed east-side cities of the Guangdong-Hong Kong-Macao Greater Bay area have higher connectivity with roads, railways, ports, and aviation transport. Guangzhou, Foshan, Zhuhai, Shenzhen, Hong Kong and Macao are closely linked. The higher the accessibility, the closer the intercity connectedness. | CAO Xiaoshu OUYANG Shishu YANG Wenyue LUO Yi LI Baochao LIU Dan | 2019 | Chinese Geographical Science2019，29，5： | 6 |
| 5 | A Tractable Approach to Analyzing the Physical-Layer Security in K-Tier Heterogeneous Cellular Networks显示文摘This study proposes a tractable approach to analyze the physical-layer security in the downlink of a multi-tier heterogeneous cellular network. This method is based on stochastic geometry, has low computational complexity, and uses the two-dimensional Poisson point process to model the locations of K-tier base stations and receivers, including those of legitimate users and eavesdroppers. Then, the achievable secrecy rates for an arbitrary user are determined and the upper and lower bounds of secrecy coverage probability derived on the condition that cross-tier interference is the main contributor to aggregate interference. Finally, our analysis results reveal the innate connections between information-theoretic security and the spatial densities of legitimate and malicious nodes. | ZHONG Zhihao PENG Janhua LUO Wenyu HUANG Kaizhi | 2015 | China Communications2015，12，S1： | 6 |
| 6 | Sound propagation from the shelfbreak to deep water显示文摘Motivated by a phenomenon in an experiment conducted in the Northwestern Pacific indicating that the energy of the received signal around the sound channel axis is much greater than that at shallower depths,we study sound propagation from the transitional area(shelfbreak)to deep water.Numerical simulations with different source depths are first performed,from which we reach the following conclusions.When the source is located near the sea surface,sound will be strongly attenuated by bottom losses in a range-independent oceanic environment,whereas it can propagate to a very long range because of the continental slope.When the source is mounted on the bottom in shallow water,acoustic energy will be trapped near the sound channel axis,and it converges more evidently than the case where the source is located near the sea surface.Then,numerical simulations with different source ranges are performed.By comparing the relative energy level in the vertical direction between the numerical simulations and the experimental data,the range of the air-gun source can be approximated. | QIN JiXing ZHANG RenHe LUO WenYu PENG ZhaoHui LIU JianJun WANG DeJun | 2014 | Science China(Physics,Mechanics & Astronomy)2014，57，6： | 3 |
| 7 | Stability and a fast calculation method of travel speed of pulse peak in convergence zone显示文摘A long-range sound propagation experiment was conducted in the West Pacific Ocean in summer 2013.The signals received by a towed array indicate that the travel speed of pulse peak(TSPP)in the convergence zones is stable.Therefore,an equivalent sound speed can be used at all ranges in the convergence zones.A fast calculation method based on the beam-displace-ment ray-mode(BDRM)theory and convergence zone theory is proposed to calculate this equivalent sound speed.The computation speed of this proposed method is over 1000 times faster than that of the conventional calculation method based on the normal mode theory,with the computation error less than 0.4%compared with the experimental result.Also,the effect of frequency and sound speed profile on the TSPP is studied with the conventional and fast calculation methods,showing that the TSPP is almost independent of the frequency and sound speed profile in the ocean surface layer. | REN Yun ZHANG RenHe WANG Jun GUO YongGang Luo WenYu | 2014 | Science China(Physics,Mechanics & Astronomy)2014，57，7： | 3 |
| 8 | Magmatic Hydrothermal Origin of the Wenyu Copper Polymetallic Deposit, Southern Lancangjiang Zone, SW China显示文摘The Wenyu copper polymetallic deposit,with proven reserves of about 0.23 Mt Cu,394 t Ag and0.04 Mt Pb,is located in the central part of the Lancangjiang volcanic rock belt(Fig.1a),which is one of the most potential copper polymetallic exploration areas in SW China.The Wenyu deposit is hosted in the Xiaodingxi Formation | YANG Yongfei FAN Wenyu LUO Maojin SHI Hongzhao | 2015 | Acta Geologica Sinica(English Edition)2015，89，5： | 2 |
| 9 | Structure formation dynamics in drawing silica photonic crystal fibres显示文摘 | Wenyu WANG Ghazal Fallah TAFTI Mingjie DING Yanhua LUO Yuan TIAN Shuai WANG Tomasz KARPISZ John CANNING Kevin COOK Gang-Ding PENG | 2018 | Frontiers of Optoelectronics2018，11，1： | 2 |
| 10 | Analysis and comparison between two coupled-mode methods for acoustic propagation in range-dependent waveguides显示文摘Two coupled-mode methods,namely DGMCM(Direct-Global-Matrix CoupledMode Method)and CCMM(Consistent Coupled-Mode Method),are analyzed and compared.First,both of these two methods provide two-way solutions,and hence they are accurate models.Second、the series of local vertical modes in DGMCM converges as fast as that in CCMM,whereas DGMCM has a more tolerable requirement of the number of segments than CCMM.Third,these two models obtain the field solution by solving the coupled-mode system with different coefficient matrices,in which the computational etfort for the required parameters is almost the same.Finally,DGMCM can handle some problems which are difficult for CCMM,such as in a waveguide with a rough bottom,a line source located right on top of a sloping bottom,or in the presence of multiple sources.In DGMCM,closed-form expressions for coupling matrices in a two-layer waveguide are given.In addition.the formulation for the line-source problem in plane geometry is derived to update CCMM. | QIN Jixing LUO Wenyu ZHANG Renhe YANG Chunmei | 2014 | Chinese Journal of Acoustics2014，33，1： | 2 |
| 11 | Learning to focus: cascaded feature matching network for few-shot image recognition显示文摘Generally, deep networks learn to recognize a category of objects by training on a large number of annotated images accurately. However, a meta-learning problem known as a low-shot image recognition task occurs when a few images with annotations are available for learning a recognition model for a single category. Consequently, the objects in testing/query and training/support image datasets are likely to vary in terms of size, location, style, and so on. In this paper, we propose a method, cascaded feature matching network(CFMN), to solve this problem. We train the meta-learner to learn a more fine-grained and adaptive deep distance metric using feature matching block, which aligns associated features together and naturally ignores non-discriminative features. By applying the proposed feature matching block in different layers of the network, multi-scale information among the compared images is incorporated into the final cascaded matching feature, which boosts the recognition performance and generalizes better by learning on relationships. Moreover, the experiments for few-shot learning(FSL) using two standard datasets:miniImageNet and Omniglot, confirm the effectiveness of our proposed method. Besides, the multi-label fewshot task is first studied on a new data split of the COCO dataset, which further shows the superiority of the proposed feature matching network when performing the FSL in complex images. | Mengting CHEN Xinggang WANG Heng LUO Yifeng GENG Wenyu LIU | 2021 | Science China(Information Sciences)2021，64，9： | 2 |
| 12 | Development of an engineered soil bacterium enabling to convert both insoluble inorganic and organic phosphate into plant available phosphate and its use as a biofertilizer显示文摘 | Liu Lili Du Wenya Luo Wenyu | 2015 | Molecular Biotechnology2015，57，5： | 1 |
| 13 | 全脑放疗同步或序贯替尼泊甙、顺铂治疗小细胞肺癌脑转移(英文)显示文摘Objective: The aim of the study was to compare efficacies and safeties of 2 different treatments of whole brain radiotherapy (WBRT) sequential or concomitant Vm26/DDP for small cell lung cancer (SCLC) patients with brain metastases. Methods: A total of 39 patients were randomly divided into sequential chemoradiotherapy regime (A group, 20 patients) and concomitant chemoradiotherapy regime (B group, 19 patients). The dose of WBRT was 36 Gy in 18–20 fractions, chemotherapy of Vm26/DDP regimen with teniposide 60 mg/m2 on d1 to d3 and cisplatin 20 mg/m2 on d1 to d5, repeating every 3 weeks. The response was evaluated after WBRT and 2 cycles of chemotherapy. Results: Total response rates of A and B groups were 70.0% and 78.9% respectively (P = 0.520). The median survival was 11 months in A group and 10 months in B group. Six, twelve and eighteen months cumulative survival rates of A and B groups were 75.0%, 42.5%, 26.2%, and 81.6%, 26.4%, 10.5%, respectively (χ2 = 0.383, P > 0.05). Response rate and the number of brain metastases were independent prognostic factors. Conclusion: Both sequential and concomitant chemoradiotherapy groups are effective, and the main toxicity with myelosuppression is tolerable after therapy. It can be applied firstly and effectively to the SCLC patients with brain metastases in clinic . | Mingyue Liu Yun Zhou Qian Han Tianhui Gao Zhifen Luo Wenyu Wang | 2010 | The Chinese-German Journal of Clinical Oncology2010，9，1： | 1 |
| 14 | Environmental microcystin exposure triggers the poor prognosis of prostate cancer: Evidence from case-control, animal, and in vitro studies显示文摘Microcystin-leucine-arginine(MC-LR)is positively linked with multiple cancers in humans.However,the association between MC-LR and the risk and prognosis of prostate cancer has not been conducted in epidemiological studies.No reported studies have linked MC-LR exposure to the poor prognosis of prostate cancer by conducting experimental studies.The content of MC-LR was detected in most of the aquatic food in wet markets and supermarkets in Nanjing and posed a health risk for consumers.MC-LR levels in both prostate cancer tissues and serum were significantly higher than controls.The adjusted odds ratio(OR)for prostate cancer risk by serum MC-LR was 1.75(95%CI:1.21-2.52)in the whole subjects,and a positive correlation between MC-LR and advanced tumor stage was observed.Survival curve analysis indicated patients with higher MC-LR levels in tissues exhibited poorer overall survival.Human,animal,and cell studies confirmed that MC-LR exposure increases the expression of estrogen receptor-α(ERα)and promotes epithelial-mesenchymal transition(EMT)in prostate cancer.Moreover,MC-LR-induced decreased E-cadherin levels,increased vimentin levels,and increased migratory and invasive capacities of prostate cancer cells were markedly suppressed upon ERαknockdown.MC-LR-induced xenograft tumor growth and lungmetastasis in BALB/c nude mice can be effectively alleviated with ERαknockdown.Our data demonstrated that MC-LR upregulated vimentin and downregulated E-cadherin through activating ERα,promoting migration and invasion of prostate cancer cells.Our findings highlight the role of MC-LR in prostate cancer,providing new perspectives to understand MC-LR-induced prostatic toxicity. | Chun Pan Haixiang Qin Minghao Yan Xuefeng Qiu Wenyue Gong Wenxin Luo Hongqian Guo Xiaodong Han | 2023 | Journal of Environmental Sciences2023，，5： | 1 |
| 15 | A machine learning vibrational spectroscopy protocol for spectrum prediction and spectrum-based structure recognition显示文摘Vibrational spectroscopy is one of the most commonly applied techniques for determining molecular structures.Conventional applications often involve extensive expertise or expensive first-principles computational effort in order to establish one-to-one spectrum-structure relationships.Here we developed a machine-learning protocol to correlate spectral fingerprints with local molecular structures.Our protocol enables not only quick and accurate prediction of infrared(IR)absorption and Raman vibrational spectra based on molecular structures,but more importantly,also enables structure recognition of chemical groups from vibrational spectral features.IR and Raman spectral features arising from different selection rules were recurrently fed to the model to achieve a nearly zero error rate in structure recognition.Both the spectrum prediction and structure recognition models have good transferability,implying a high possibility of being extended to various spectral or non-spectral characteristics.This machine learning protocol may provide impovements to real-time field applications in many areas of spectroscopy. | Hao Ren Hao Li Qian Zhang Lijun Liang Wenyue Guo Fang Huang Yi Luo Jun Jiang | 2021 | Fundamental Research2021，1，4： | 0 |
| 16 | Impairment of Autophagic Flux After Hypobaric Hypoxia Potentiates Oxidative Stress and Cognitive Function Disturbances in Mice显示文摘Acute hypobaric hypoxic brain damage is a potentially fatal high-altitude sickness.Autophagy plays a critical role in ischemic brain injury,but its role in hypo-baric hypoxia(HH)remains unknown.Here we used an HH chamber to demonstrate that acute HH exposure impairs autophagic activity in both the early and late stages of the mouse brain,and is partially responsible for HH-induced oxidative stress,neuronal loss,and brain damage.The autophagic agonist rapamycin only promotes the initiation of autophagy.By proteome analysis,a screen showed that protein dynamin2(DNM2)potentially regulates autophagic flux.Overexpression of DNM2 significantly increased the formation of autolysosomes,thus maintaining autophagic flux in combination with rapamycin.Furthermore,the enhancement of autophagic activity attenuated oxidative stress and neurological deficits after HH exposure.These results contribute to evidence supporting the conclusion that DNM2-mediated autophagic flux represents a new therapeutic target in HH-induced brain damage. | Shuhui Dai Yuan Feng Chuanhao Lu Hongchen Zhang Wenke Ma Wenyu Xie Xiuquan Wu Peng Luo Lei Zhang Fei Fei Zhou Fei Xia Li | 2024 | Neuroscience Bulletin2024，40，1： | 0 |
| 17 | The Nearest Complex Polynomial with a Prescribed Zero显示文摘Nearest polynomial with given properties has many applications in control theory and applied mathematics. Given a complex univariate polynomial f(z) and a zero α, in this paper we explore the problem of computing a complex polynomial f(z) such that f(α) = 0 and the distance ∥f-f ∥ is minimal. Considering most of the existing works focus on either certain polynomial basis or certain vector norm, we propose a common computation framework based on both general polynomial basis and general vector norm, and summarize the computing process into a four-step algorithm. Further, to find the explicit expression of f(z), we focus on two specific norms which generalize the familiar lp-norm and mixed norm studied in the existing works, and then compute f(z) explicitly based on the proposed algorithm. We finally give a numerical example to show the effectiveness of our method. | Wenyu HU Zhongxuan LUO | 2015 | Journal of Mathematical Research with Applications2015，35，1： | 0 |
| 18 | An efficient broadband coupled-mode model using the Hamiltonian method for modal solutions显示文摘A numerically efficient broadband, range-dependent propagation model is proposed, which incorporates the Hamiltonian method into the coupled-mode model DGMCM. The Hamiltonian method is highly efficient for finding broadband eigenvalues, and DGMCM is an accurate model for range-dependent propagation in the frequency domain. Consequently, the proposed broadband model combining the Hamiltonian method and DGMCM has significant virtue in terms of both efficiency and accuracy. Numerical simulations are also provided. The numerical results indicate that the proposed model has a better performance over the broadband model using the Fourier synthesis and COUPLE, while retaining the same level of accuracy. | XueFeng Yang WenYu Luo HaoZhong Wang ChangQing Hu | 2017 | Science China(Physics,Mechanics & Astronomy)2017，60，9： | 0 |
| 19 | Ⅲ–Ⅴ compound materials and lasers on silicon显示文摘Silicon-based photonic integration has attracted the interest of semiconductor scientists because it has high luminous efficiency and electron mobility.Breakthroughs have been made in silicon-based integrated lasers over the past few decades.Here we review three main methods of integration ofⅢ–Ⅴ materials on Si,namely direct growth,bonding,and selectivearea hetero-epitaxy.TheⅢ–Ⅴmaterials we introduced mainly include materials such as GaAs and InP.The lasers are mainly lasers of related communication bands.We also introduced the advantages and challenges of the three methods. | Wenyu Yang Yajie Li Fangyuan Meng Hongyan Yu Mengqi Wang Pengfei Wang Guangzhen Luo Xuliang Zhou Jiaoqing Pan | 2019 | Journal of Semiconductors2019，40，10： | 0 |
| 20 | A two-way marching coupled-mode method for range-dependent propagation显示文摘An efficient,accurate,and numerically stable coupled-mode solution is presented for acoustic propagation in a range-dependent waveguide.This method is numerically stable due to the appropriately normalized range solutions introduced in the formulation.In addition,by combining a forward marching and a backward marching,this method provides accurate solutions for range-dependent propagation problems,especially those characterized by large bottom slope angle and/or high impedance contrast between water and the bottom.Furthermore,this two-way solution also provides high efficiency,which is achieved by applying the single-scatter approximation.Numerical examples are also provided to demonstrate the efficiency,accuracy, and stability of this method. | LUO Wenyu ZHANG Renhe SCHMIDT Henrik | 2012 | Chinese Journal of Acoustics2012，31，4： | 0 |
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