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| 1 | Joint User Scheduling and Antenna Selection in Distributed Massive MIMO Systems with Limited Backhaul Capacity显示文摘Massive MIMO systems offer a high spatial resolution that can drastically increase the spectral and/or energy efficiency by employing a large number of antennas at the base station(BS).In a distributed massive MIMO system,the capacity of fiber backhaul that links base station and remote radio heads is usually limited,which becomes a bottleneck for realizing the potential performance gain of both downlink and uplink.To solve this problem,we propose a joint antenna selection and user scheduling which is able to achieve a large portion of the potential gain provided by the massive MIMO array with only limited backhaul capacity.Three sub-optimal iterative algorithms with the objective of sumrate maximization are proposed for the joint optimization of antenna selection and user scheduling,either based on greedy fashion or Frobenius-norm criteria.Convergence and complexity analysis are presented for the algorithms.The provided Monte Carlo simulations show that,one of our algorithms achieves a good tradeoff between complexity and performance and thus is especially fit for massive MIMO systems. | XU Guozhen LIU An JIANG Wei XIANG Haige LUO Wu | 2014 | China Communications2014，11，5： | 9 |
| 2 | An analytic solution describing the visco-elastic deformation of coal pillars in room and pillar mine显示文摘Coal pillar deformation is typically nonlinear and time-dependent. The accurate prediction of this defor- mation has a vital importance for the successful implementation of mining techniques. These methods have proven very important as a way to excavate coal resources from under buildings, railways, or water bodies. Elastic and visco-elastic theory are employed with a Maxwell model to formulate an analytic solution for displacement of coal pillars in room and pillar mine. These results show that the visco-elastic solution adequately predicts the coal pillar deformation over time. We conclude that the visco-elastic solution can predict the coal pillar and roadway displacement from the measured geological parameters of the conditions in situ. Furthermore, this method would be useful for mine design, coal pillar support optimization, ground subsidence prediction, and coal pillar stability analysis. | Li Qiang XU Hui BU Wankui Zhao Guozhen | 2011 | Mining Science and Technology2011，21，6： | 5 |
| 3 | Energy-Efficient Beamforming for Two-Tier Massive MIMO Downlink显示文摘Heterogeneous networks(HetNets)consisting of macro cells with very large antenna arrays and a secondary tier of small cells with a few antennas each can well tackle the contradiction of large coverage of the network and high data rate at the hot spots.However,it is not permissible to assign orthogonal pilot sequences for all the supported users due to the large number.Hence,we propose a pilot reduction scheme based on the heterogeneous system configurations and the unique topology of this HetNet.The reusing of pilot sequences causes the presence of the contaminated channel state information(CSI) and results in receivers' Quality of Service(QoS) outage.With the contaminated CSI,we provide an energy-efficient beamforming based on minimizing the total power consumption while keeping the QoS constraints satisfied and restricting the QoS outage probability below a given specification.By applying the approach of Bernstein approximation and semi-definite relaxation,we transform the original intractable chance constrained program to a convex problem conservatively.Numerical results show that the average power consumption of the proposed beamforming for our pilot reduction scheme is close to that of the perfect CSI case.Since our scheme will greatly compress the length of pilot sequence especially for those highly densified network with large number of small cells,it will be crucially helpful to put such two-tier massive multiple-input and multiple-output(MIMO) systems into practice. | XU Guozhen LIU An JIANG Wei XIANG Haige LUO Wu | 2015 | China Communications2015，12，10： | 3 |
| 4 | Valency Study of Vanadium in Stone Coal of Southern China显示文摘Vanadium-bearing stone coal is a new resource of vanadium. V in stone coal mainly exists in three oxidation states: 7.84%V(Ⅲ), 72.08% Ⅴ(Ⅳ) and 20.08% Ⅴ(Ⅴ). The change and distribution of valency of Ⅴ during oxidizing roasting shows that organicmatter in the coal determines valency of Ⅴ at low temperature; at about 450℃, Ⅴ(Ⅲ) is completely oxidized to Ⅴ(Ⅳ); above500℃, temperature is the most important factor for the oxidation of Ⅴ. At 700~1000℃, 92% of Ⅴ in the coal has been oxidizedto Ⅴ(Ⅴ), at still higher temperature no more oxidation of Ⅴ takes place, an equilibrium being established. The roles of NaCl in therecovery of V2O5 from the coal were discussed. The best conditions for roasting are: the oxidation-chlorination atmosphere,temperature 800℃ for 30 minutes, ore: NaCl=100:10,ηroast reaching 90%. | Xu, Guozhen Ge, Nai'e Chen, Jianping Shen, Shaobo | 1990 | Rare Metals1990，10，2： | 3 |
| 5 | A risk-prediction score for colorectal lesions on 12,628 participants at high risk of colorectal cancer显示文摘Background The uptake of colonoscopy is low in individuals at risk of colorectal cancer(CRC).We constructed a riskprediction score(RPS)in a large community-based sample at high risk of CRC to enable more accurate risk stratification and to motivate and increase the uptake rate of colonoscopy.Methods A total of 12,628 participants classified as high-risk according to positivity of immunochemical fecal occult blood tests or High-Risk Factor Questionnaire underwent colonoscopy.Logistic regression was used to derive a RPS and analysed the associations of the RPS with colorectal lesions,giving odds ratios(ORs)and 95%confidence intervals(CIs).Results Of the participants,men(OR=1.73,95%CI=1.58–1.90),older age(≥65 years;1.41,1.31–1.53),higher body mass index(≥28 kg/m^(2);1.22,1.07–1.39),ever smoking(1.47,1.31–1.65),and weekly alcohol use(1.28,1.09–1.52)were associated with a higher risk of colorectal lesions.We assigned 1 point to each of the above five risk factors and derived a RPS ranging from 0 to 5,with a higher score indicating a higher risk.Compared with a RPS of 0,a RPS of 1,2,3,and 4–5 showed a higher risk of colorectal lesions,with the OR(95%CI)being 1.50(1.37–1.63),2.34(2.12–2.59),3.58(3.13–4.10),and 3.91(3.00–5.10),respectively.The area under the receiver-operating characteristic curve of RPS in predicting colorectal lesions was 0.62.Conclusions Participants with an increase in the RPS of≥1 point had a significantly higher risk of colorectal lesions,suggesting the urgency for measuring colonoscopy in this very high-risk group.High-risk strategies incorporating RPS may be employed to achieve a higher colonoscopy-uptake rate. | Lixin Liang Yingru Liang Ke Li Pengzhe Qin Guozhen Lin Yan Li Huan Xu Suixiang Wang Qinlong Jing Boheng Liang Lin Xu | 2022 | Gastroenterology Report2022，10，1： | 2 |
| 6 | Effect of thermal pretreatment on the surface structure of PtSn/SiO2 catalyst and its performance in acetic acid hydrogenation显示文摘活跃地点和在醋酸(AcOH ) 的 PtSn/SiO 2 催化剂的催化表演上的热预告的处理的效果加氢在这篇文章被调查。催化剂被 N 2 描绘物理吸附, X 光检查衍射,传播电子显微镜学, pyridine Fourier 变换红外线的系列,和它的物理化学的性质上的 H 2-O2 滴定。结果证明那磅种首先在水晶的结构被形成,没有 PtSn x 合金被观察。与热预告的处理温度的增长,同时,磅分散由于磅粒子的聚集显示出一个减少的趋势。同时,路易斯酸地点的数量被拥有到 Sn 种类的作为结果的物理化学的性质变化的如此的热预告的处理显著地影响。有趣地,催化活动与路易斯酸地点的显示出类似的变化趋势,证实在 AcOH 加氢的路易斯酸地点的重要角色。而且,在暴露的磅和路易斯酸地点之间的平衡效果被获得,在 AcOH 加氢导致优异催化表演。 | Guozhen Xu Jian Zhang Shengping Wang Yujun Zhao Xinbin Ma | 2016 | Frontiers of Chemical Science and Engineering2016，10，3： | 2 |
| 7 | Osteosarcoma metastasis: prospective role of ezrin显示文摘 | Yuanjin Zhang Ling Zhang Guofu Zhang Songbai Li Jun Duan Jie Cheng Guozhen Ding Chibing Zhou Jie Zhang Pengcheng Luo Dongbing Cai Lianghong Kuang Yichun Zhou Liqun Tong Xiangdong Yu Lifang Zhang Lijun Xu Li Yu Xiaomei Shi Aihong Ke | 2014 | Tumor Biology2014，，6： | 1 |
| 8 | Effects of spectral linewidth of ultrashort pulses on the spa-tiotemporal distribution of diffraction fields显示文摘The spatiotemporal characteristics of electromagnetic pulses with ultrabroad spectral bandwidth in the far field are analyzed by using classical scalar diffraction theory. The effects of the ratio of the frequency width to the central frequency on the diffraction spatial distribution are discussed. It is concluded that the diffraction spatial distribution of the pulsed radiation gets narrower than a monochromatic wave when the frequency width of the pulse is comparable to or larger than its central frequency. | Jingzhou Xu Li Wang Guozhen Yang | 2001 | Chinese Science Bulletin2001，46，11： | 1 |
| 9 | Seed germinating characteristics of 54 gramineous species in the alpine meadow on the eastern Qinghai-Tibet plateau显示文摘The germination experiment was started on March 3,2004,and seeds were collected from July to October in 2003.We analyzed the percentage of germination,days to first germination,germination period and days to 50%germination.Among the 54 examined species,26 species exceeded 80%germination,11 species exceeded 60%–80%germination,8 exceeded 40%–0%,5 exceeded 20%–40%,and 4 showed less than 20%.A principalcomponent analysis revealed that the species were distributed along two statistically independent axes,the first primarily represented the germination rate and the second represented the time of germination process.Based on scores of germination characteristics,cluster analysis of the 54 gramineous species could be divided into 4 distinct groups:rapid,slow,intermediate germinating(germination percentage>50%),and low germinating(germination percentage<50%).The meaning of different groups to the vegetation regeneration was discussed. | Haiyan BU Qingji REN Xiuli XU Kun LIU Peng JIA Shujun WEN Dashuai SUN Guozhen DU | 2008 | Frontiers in Biology2008，3，2： | 1 |
| 10 | Interfacial-Strain-Induced Structural and Polarization Evolutions in Epitaxial Multiferroic BiFeO_3(001) Thin Films显示文摘Varying the film thickness is a precise route to tune the interfacial strain to manipulate the properties of the multiferroic materials.Here,to explore the effects of the interfacial strain on the properties of the multiferroic BiFeO_3films,we investigated thickness-dependent structural and polarization evolutions of the BiFeO_3 films.The epitaxial growth with an atomic stacking sequence of BiO/TiO_2 at the interface was confirmed by scanning transmission electron microscopy.Combining X-ray diffraction experiments and first-principles calculations,a thickness-dependent structural evolution was observed from a fully strained tetragonality to a partially relaxed one without any structural phase transition or rotated twins.The tetragonality(c/a) of the BiFeO_3 films increases as the film thickness decreases,while the polarization is in contrast with this trend,and the size effect including the depolarization field plays a crucial role in this contradiction in thinner films.These findings offer an alternative strategy to manipulate structural and polarization properties by tuning the interfacial strain in epitaxial multiferroic thin films. | 郭海中 Ruiqiang Zhao Kui-juan Jin Lin Gu Dongdong Xiao Zhenzhong Yang Xiaolong Li Le Wang Xu He Junxing Gu Qian Wan Can Wang Huibin Lu Chen Ge Meng He Guozhen Yang | 2015 | 功能材料信息2015，12，3： | 1 |
| 11 | Molecularly imprinted solid phase extraction coupled to high-performance liquid chromatography for determination of trace dichlorvos residues in vegetables显示文摘 | Xu Zhixiang Fang Guozhen Wang Shuo | 2010 | Food Chem2010，119，： | 1 |
| 12 | Dual-Energy Computed Tomography Imaging of Thyroid Nodule Specimens: Comparison With Pathologic Findings显示文摘 | Ming Li Xiangpeng Zheng Jianying Li Yanli Yang Chen Lu Hua Xu Bo Yu Li Xiao Guozhen Zhang Yanqing Hua | 2012 | Investigative Radiology2012，，1： | 1 |
| 13 | The Organization and Management System of Closing Hillside for Forest as a Regeneration Project (CHFRP)显示文摘By investigation, the thesis analyses and summarizes the forming and developing of CHFRP In Xupu county. We select the Mayandong stock cooperation forest farm as object, adopt the methods such as semi-structure interview, analysing second data and surveying sample plots, analyse and study the process to clarify the property right, the profits allocated forms and the management forms. The results show that CHFRP can tentatively resolve the contradiction between the forestland using right scattered to eve... | LI Tiehua XU Guozhen ZENG Guangzheng XIANG Dong Central-south Forestry University, Zhuzhou 412006. P.R. China Forestry Bureau of Huaihua City, Huaihua 418000. . P.R. China | 2003 | Chinese Forestry Science and Technology2003，2，2： | 1 |
| 14 | Aristolochic acids exposure was not the main cause of liver tumorigenesis in adulthood显示文摘Aristolochic acids(AAs) have long been considered as a potent carcinogen due to its nephrotoxicity. Aristolochic acid I(AAI) reacts with DNA to form covalent aristolactam(AL)-DNA adducts,leading to subsequent A to T transversion mutation, commonly referred as AA mutational signature. Previous research inferred that AAs were widely implicated in liver cancer throughout Asia. In this study, we explored whether AAs exposure was the main cause of liver cancer in the context of HBV infection in China's Mainland. Totally 1256 liver cancer samples were randomly retrieved from 3 medical centers and a refined bioanalytical method was used to detect AAI-DNA adducts. 5.10% of these samples could be identified as AAI positive exposure. Whole genome sequencing suggested 8.41% of 107 liver cancer patients exhibited the dominant AA mutational signature, indicating a relatively low overall AAI exposure rate. In animal models, long-term administration of AAI barely increased liver tumorigenesis in adult mice, opposite from its tumor-inducing role when subjected to infant mice. Furthermore, AAI induced dose-dependent accumulation of AA-DNA adduct in target organs in adult mice, with the most detected in kidney instead of liver. Taken together, our data indicate that AA exposure was not the major threat of liver cancer in adulthood. | Shuzhen Chen Yaping Dong Xinming Qi Qiqi Cao Tao Luo Zhaofang Bai Huisi He Zhecai Fan Lingyan Xu Guozhen Xing Chunyu Wang Zhichao Jin Zhixuan Li Lei Chen Yishan Zhong Jiao Wang Jia Ge Xiaohe Xiao Xiuwu Bian Wen Wen Jin Ren Hongyang Wang | 2022 | Acta Pharmaceutica Sinica B2022，12，5： | 1 |
| 15 | Synthesis and characterization of a molecularly imprinted silica gel sorbent for the on-line determination of trace Sudan I in Chilli powder through high- performance liquid chromatography显示文摘 | WANG Shuo XU Zhixiang FANG Guozhen | 2007 | Journal of Agricultural and Food Chemistry2007，55，10： | 1 |
| 16 | Heart and brain governing mind together显示文摘 | XU Guozhen | 1991 | Journal of New Chinese Medicine1991，22，10： | 1 |
| 17 | Fixed point theorems of 1-set-contractive operators in Banach spaces显示文摘 | Li Guozhen Xu Shaoyuan Duan Huagui | 2006 | Applied Mathematics Letters2006，19，： | 1 |
| 18 | Molecularly imprinted solid phase extraction coupled to highperformance liquid chromatography for determination of trace dichlorvos residues in vegetables 显示文摘 | XU Zhixiang FANG Guozhen WANG Shou | 2010 | Food Chem2010，119，2： | 1 |
| 19 | Characterization and functional analysis of the genes encoding 1-deoxy- d -xylulose-5-phosphate reductoisomerase and 1-deoxy- d -xylulose-5-phosphate synthase, the two enzymes in the MEP pathway, from Amomum villosum Lour显示文摘 | Jinfen Yang Megha Nath Adhikari Hui Liu Hui Xu Guozhen He Ruoting Zhan Jieshu Wei Weiwen Chen | 2012 | Molecular Biology Reports2012，，8： | 1 |
| 20 | Flexible coaxial-type fiber supercapacitor based on NiCo 2 O 4 nanosheets electrodes显示文摘 | Qiufan Wang Xianfu Wang Jing Xu Xia Ouyang Xiaojuan Hou Di Chen Rongming Wang Guozhen Shen | 2014 | Nano Energy2014，，： | 1 |
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