检索结果-南通市图书馆

Cross-layer scheduling with fairness for multi-user OFDM system:a restless bandit approach

在线全文

学校读者我要写书评

暂无评论

The Journal of China Universities of Posts and Telecommunications 2011年第4期18卷 25-30页

作者： GE wen-dong ji Hong li Xi Key Laboratory of Universal Wireless Communications Ministry of Education Beijing University of Posts and Telecommunications Beijing 100876 China

In OFDM-based System such as long term evolution （LTE）, the scheduling scheme plays an essential role in not only improving the capacity of system, but also guarantee the fairness among the user equipments （UEs）. However, most existing work about scheduling only considers the current throughput in physical layer. Thus in this paper, a cross-layer scheduling with fairness based on restless bandit （CSFRB） scheme with the ＇indexability＇ property is proposed for the multi-user orthogonal frequency-division multiplexing （OFDM） system to minimize the distortion in the application layer, to maximize the throughput and to minimize the energy consumption in the physical layer. The scheduling problem is firstly established as a restless bandit problem, which is solved by the primal-dual index heuristic algorithm based on the first order relaxation with low complexity, to yield the CSFRB scheme. AdditionaUy, this scheme is divided into offiine computation and online selection, where main work will be finished in former one so as to decrease the complexity further. Finally, extensive simulation results illustrate the significant performance improvement of the proposed CSFRB scheme compared to the existing one in different scenarios.

关键词： multi-user OFDM scheduling cross-layer design restless bandits

Effects of patients'understanding and choice of surgical types on postoperative outcomes of Peyronie’s disease:a single-center retrospective study of 108 patients

在线全文

学校读者我要写书评

暂无评论

Asian Journal of Andrology 2021年第5期23卷 484-489页

作者： Da-Chao Zheng jie-wen Bao jian-Hua Guo Min-Kai Xie wen ji li Zhong Wang Department of Urology and Andrology Ninth People's HospitalSchool of MedicineShanghai Jiaotong UniversityShanghai 200011China

Surgical correction can be considered for treating patients with a chronic phase of Peyronie’s disease(PD)and persistent penile *** clinical practice,some patients pay too much attention to surgical complications and refuse the recommended feasible surgical ***,they require operations according to their *** study aimed to evaluate the effects of patients’own choice of surgical type on postoperative *** retrospective study analyzed data from 108 patients with PD who underwent surgical correction according to doctors’recommendations or patients’own *** objective and subjective surgical outcomes were ***1 understanding of the disease was analyzed using a questionnaire *** measurements of surgical outcomes,including penile straightening,penile length,and sexual function,in patients who received the recommended surgery,were similar to those in patients who did not accept the recommended ***,subjective evaluations,including erectile pain,discomfort because of nodules on the penis,and decreased sensitivity in the penis,were more obvious in patients who did not follow doctors’*** addition,a questionnaire survey showed that understanding PD and the purpose of surgery of patients who did not follow doctors’advice were inappropriate,as they did not conform to the principle of *** present study showed that surgical correction seemed to be an objectively effective option in the management of patients in the stable chronic phase of *** patient satisfaction might be related to patients’lack of correct understanding of the disease and its treatment strategy as well as unrealistic expectations.

关键词： grafting procedure patient’s satisfaction penile curvature Peyronie’s disease plication

Effects of plication procedures in special cases of Peyronie’s disease:a single-center retrospective study of 72 patients

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Asian Journal of Andrology 2022年第3期24卷 294-298页

作者： wen ji li jie-wen Bao jian-Hua Guo Da-Chao Zheng Min-Kai Xie Zhong Wang Department of Urology and Andrology Ninth People’s HospitalSchool of MedicineShanghai Jiaotong UniversityShanghai 200011China

General recommendations regarding surgical techniques are not always appropriate for all Peyronie’s disease(PD)***,the purpose of this study was to investigate the effects of plication procedures in PD patients with severe penile curvature and the effects of early surgical correction in patients who no longer have progressive *** clinical data from 72 patients who underwent plication procedures were analyzed in this *** were divided into Groups A and B according to the curvature severity(≤60°or>60°)and Groups 1 and 2 according to the duration of disease stabilization(≥3 months orlication procedures seemed to be an effective choice for the surgical treatment of PD patients with severe penile *** addition,the early surgical treatment seemed to benefit those patients who already had no erectile pain and no longer exhibited progressive deformity.

关键词： penile curvature Peyronie’s disease plication

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

自然低温下红茴香和双蕊野扇花的耐寒性研究

江西农业学报 2024年第9期36卷 52-59页

作者：李盼盼江松霖薛宁涵吉文丽马志林西北农林科技大学风景园林艺术学院陕西杨凌712100 陕西省林业科学院陕西西安710082

以红茴香(Illicium henryi Diels)和双蕊野扇花(Sarcococca hookeriana *** Franch)为试验材料,在越冬期间持续观察叶片的形态变化,并测定植株叶片的叶绿素含量、相对电导率、可溶性糖含量等生理指标,为2种植物在北方地区园林的引种栽... 详细信息

以红茴香(Illicium henryi Diels)和双蕊野扇花(Sarcococca hookeriana *** Franch)为试验材料,在越冬期间持续观察叶片的形态变化,并测定植株叶片的叶绿素含量、相对电导率、可溶性糖含量等生理指标,为2种植物在北方地区园林的引种栽培应用提供依据。结果表明:红茴香和双蕊野扇花在寒冷环境下仍能保持较好的生长状态,表现出较强的耐寒能力;在越冬过程中,红茴香和双蕊野扇花叶片的相对电导率、过氧化物酶活性均呈现出先升后降的变化趋势,可溶性蛋白含量则呈现出先降低后升高的变化趋势,可溶性糖含量随温度下降而升高,各指标与气温之间的相关性也较大。综上,红茴香和双蕊野扇花对引种地的低温环境均表现出了一定适应能力,能及时运行体内各种调节机制抵御低温伤害。

关键词：红茴香双蕊野扇花引种栽培自然低温耐寒性

Synthesis, Properties and Structureof a Novel Unsymmetrical Bis (phenoxo) BridgedBinuclear Copper (Ⅱ) Complex

在线全文

学校读者我要写书评

暂无评论

Chemical Research in Chinese Universities 2001年第2期17卷 148-152页

作者： LU Tong-bu , li Yan-wu, FENG Xiao-long CAl ji-wen, li Xiao-yan and ji liang-nian (Department of Chemistry and Center of Measurement, Zhongshan University, Guangzhou 510275, P. R. China) 中山大学广东广州 510275

A novel bis (phenoxo) bridged binuclear copper ( II) complex with dissimilar coordination environments was synthesized and characterized by spectroscopies and X-ray crystallography. It crystallized in the monoclinic system with space group C2/c, a=2. 241 1(2) nm, b=1. 834 2 (2) nm, c=1.877 9(2) nm, β=122.861(2)°, V=6.484 3(11) nm3, Z=8. Itconsistsof two unsymmetrical Cu (Ⅱ ) centers bridged by two phenolic oxygen atoms to yield a Cu2O2 core with the Cu-Cu separation of 0. 310 2 nm, in which Cul and Cu2 ions exhibit distorted N2O3 and N3O2 square pyramidal geometries, respectively.

关键词： Copper Binuclear complex Crystallization

Dielectric response of ANb_(2)O_(6)(A = Zn, Co, Mn, Ni) columbite niobates: From microwave to terahertz

在线全文

学校读者我要写书评

暂无评论

Journal of Advanced Ceramics 2024年第8期13卷 1189-1197页

作者： Weijia Luo Shun Wang Siyong Zheng jining li Menglong Wang Yongzheng wen ingxia li ji Zhou State Key Laboratory of New Ceramics and Fine Processing School of Materials Science and EngineeringTsinghua UniversityBeijing 100084China Institute of Laser and Optoelectronics School of Precision Instrument and Opto-Electronics EngineeringTianjin UniversityTianjin 300072China Shandong Inspur Artificial Intelligence Research Institute Co. Ltd.Jinan 250013China School of Microelectronics Tianjin UniversityTianjin 300072China

In the upcoming 6-generation(6G)revolution,the achievement of low power consumption has become a key objective in research concerning terahertz *** an important component of passive devices,there are very few low-loss dielectric ceramics in the terahertz *** elucidate the mechanism of loss and promote the application of microwave dielectric ceramics for future 6G technology(covering microwave and terahertz frequencies),the terahertz responses of ANb_(2)O_(6)(A=Zn,Co,Mn,and Ni)columbite niobates were *** influences of magnetic loss on the Qxf values in the microwave range with different transition metal ions in the A-site were reasonably ***,due to the weakened magnetic relaxation properties in the terahertz range,the samples all exhibited low loss and approximate transparency,especially for MnNb_(2)O_(6) and NiNb_(2)O_(6)(tanolidate the applicability of the ANb_(2)O_(6) system in the terahertz band,which is highly important for the development of terahertz ceramic-based passive devices.

关键词： columbite niobates terahertz response transition metal ions magnetic loss ceramic-based metamaterials

Enhanced thermoelectric and mechanical properties of Bi_(0.5)Sb_(1.5)Te_(3) alloy with dispersed yttrium oxide ceramic nanoparticles

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Rare Metals 2024年第4期43卷 1758-1768页

作者： Cun-Cheng li Ming-Wei Zhang ji-Wu Xin Lei Wei wen-Yu Zhao School of Materials Science and Engineering Shandong University of TechnologyZibo255000China School of Electrical and Electronic Engineering Nanyang Technological UniversitySingapore639798Singapore State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan430070China

Reducing thermal conductivity while avoiding adverse interfacial reactions during sintering is crucial for improving the thermoelectric performance of Bi_(2)Te_(3)based *** ceramic nanoparticles are good candidates for achieving this *** this study,we designed and prepared a series of p-type Bi_(0.5)Sb_(1.5)Te_(3)nanocomposites decorated with Y_(2)O_(3)ceramic nanoparticles via ball-milling dispersion and spark-plasma *** to the chemical stability of the ceramics,no traces of atomic doping or interfacial reactions were *** measurements revealed that the Y_(2)O_(3)nanoparticles distributed along the grain boundaries acted as energy-dependent carrier-filtering centers to improve the scattering parameter and Seebeck coefficient,contributing to the elevated power factor even with a decreased electrical ***,the incorporated Y_(2)O_(3)nanoparticles and various defect structures they induced effectively strengthened the phonon scattering and suppressed the lattice thermal ***,a peak figure of merit(ZT)of 1.23 at 313 K was achieved for 0.4%Y_(2)O_(3)/Bi_(0.5)Sb_(1.5)Te_(3),which is 13%higher than that of the *** addition,the Vickers hardness of the composite material was 35%higher than that of the *** study demonstrates the effectiveness of ceramic nanoparticles in synergistic ally improving the thermoelectric and mechanical properties,which may be further extended to other thermoelectric systems.

关键词： Bi_(0.5)Sb_(1.5)Te_3 alloy Y_(2)O_(3) ceramic nanoparticles Microstructures Thermoelectric performance Mechanical properties

One-step construction of strongly coupled Co_(3)V_(2)O_(8)/Co_(3)O_(4)/MXene heterostructure via in-situ Co-F bonds for high performance all-solid-state asymmetric supercapacitors

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2024年第2期43卷 682-691页

作者： ji Zhou Bin-Bin liu Hu Zheng wen-Qing Ma Qian li Cai-Xia Xu Institute for Advanced Interdisciplinary Research(iAIR) Collaborative Innovation Center of Technology and Equipment for Biological Diagnosis and Therapy in Universities of ShandongSchool of Chemistry and Chemical EngineeringUniversity of JinanJinan250022China

Co_(3)V_(2)O_(8)/Co_(3)O_(4)/Ti_(3)C_(2)T_(x) composite was easily synthesized via one-step succinct-operated hydrothermal *** interconnected Co_(3)V_(2)O_(8)/Co_(3)O_(4) nanowires network can in-situ grow and anchor on the surface of Ti_(3)C_(2)T_(x) via the strong Co-F bonds and contribute tremendously to depress Ti_(3)C_(2)T_(x) *** from the synergistically interplayed effect among the multiple interfaces and high conductivity of Ti_(3)C_(2)T_(x) as well as outstanding stability of the as-designed nanostructure,the optimum Co_(3)V_(2)O_(8)/Co_(3)O_(4)/Ti_(3)C_(2)T_(x)electrode reaches a commendable specific capacitance(up to 3800 mF·cm^(−2)),great rate capability(80%capacitance retention after 20-times current increasing),and preeminent cycling stability(95.4%/85.5%retention at 7000th/20,000th cycle).Moreover,the all-solid-state asymmetric supercapacitor based on Co_(3)V_(2)O_(8)/Co_(3)O_(4)/Ti_(3)C_(2)T_(x) and active carbon can deliver a high energy density of 84.0μWh·cm^(−2) at the power energy of 3.2 mW·cm^(−2),and excellent cycling durability with 87.0%of initial capacitance retention upon 20,000 *** work provides a practicable pathway to tailor MXene-based composites for high-performance supercapacitor.

关键词： Ti_(3)C_(2)T_(x) Co_(3)V_(2)O_(8)/Co_(3)O_(4) Heterostructure Cathode Supercapacitor

Index-free triangle-based graph local clustering

在线全文

学校读者我要写书评

暂无评论

Frontiers of Computer Science 2024年第3期18卷 143-153页

作者： Zhe YUAN Zhewei WEI Fangrui LV ji-Rong wen The Country and Area Studies Academy Beijing Foreign Studies UniversityBeijing 100089China Gaoling School of Artificial Intelligence Renmin University of ChinaBeijing 100872China

Motif-based graph local clustering(MGLC)is a popular method for graph mining tasks due to its various ***,the traditional two-phase approach of precomputing motif weights before performing local clustering loses locality and is impractical for large *** some attempts have been made to address the efficiency bottleneck,there is still no applicable algorithm for large scale graphs with billions of *** this paper,we propose a purely local and index-free method called Index-free Triangle-based Graph Local Clustering(TGLC^(*))to solve the MGLC problem w.r.t.a ***^(*)directly estimates the Personalized PageRank(PPR)vector using random walks with the desired triangleweighted distribution and proposes the clustering result using a standard sweep *** demonstrate TGLC^(*)’s scalability through theoretical analysis and its practical benefits through a novel visualization ***^(*)is the first algorithm to solve the MGLC problem without precomputing the motif *** experiments on seven real-world large-scale datasets show that TGLC^(*)is applicable and scalable for large graphs.

关键词： graph local clustering triangle motif index-free sampling method visualization