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| 1 | Joint Optimal Energy-Efficient Cooperative Spectrum Sensing and Transmission in Cognitive Radio显示文摘In order to improve the energy efficiency(EE) in cognitive radio(CR), a joint optimal energy-efficient cooperative spectrum sensing(CSS) and transmission in multi-channel CR is proposed in this paper. EE is described as a tradeoff between the throughput and the entirely consumed power. A joint optimization problem is formulated to maximize EE by jointly optimizing local sensing time, number of cooperative sensing secondary users(SU), transmission bandwidth and power. A combined optimization algorithm of bi-level optimization, Polyblock optimization and Dinkelbach's optimization is proposed to solve the proposed non-convex optimization problem effectively. The simulation results show that, compared with throughput maximization model(TMM), the energy efficiency maximization model(EEMM) improves EE of the CR system and limits the excessive power consumption effectively. | Weizhi Zhong Kunqi Chen Xin Liu | 2017 | China Communications2017，14，1： | 3 |
| 2 | Utility function based fair data scheduling algorithm for OFDM wireless network显示文摘A system model is formulated as the maximization of a total utility function to achieve fair downlink data scheduling in multiuser orthogonal frequency division multiplexing (OFDM) wireless networks. A dynamic subcarrier allocation algorithm (DSAA) is proposed, to optimize the system model. The subcarrier allocation decision is made by the proposed DSAA according to the maximum value of total utility function with respect to the queue mean waiting time. Simulation results demonstrate that compared to the conventional algorithms, the proposed algorithm has better delay performance and can provide fairness under different loads by using different utility functions. | Guo Kunqi Sun Lixin Jia Shilou | 2007 | Journal of Systems Engineering and Electronics2007，18，4： | 3 |
| 3 | Local electrical charac terization of t wo-dimensional mat erials with functional atomic force microscopy显示文摘Research about two-dimensional (2D) materials is growing exponentially across various scientific and engineering disciplines due to the wealth of unusual physical phenomena that occur when charge transport is confined to a plane. The applications of 2D materials are highly affected by the electrical properties of these mat erials, including curren t dist ribution, surface pot ential, dielectric response, conductivity, perm计tivity, and piezoelectric response. Hence, it is very crucial to characterize these properties at the nanoscale. The Atomic Force Microscopy (AFM)-based techniques are powerful tools that can simultaneously characterize morphology and electrical properties of 2D materials with high spatial resolution, thus being more and more extensively used in this research field. Here, the principles of these AFM techniques are reviewed in detail. After that, their representative applications are further demonstrated in the local characterization of various 2D materials? elcctrical properties. | Sabir Hussain Kunqi Xu Shili Ye Le Lei Xinmeng Liu Rui Xu Liming Xie Zhihai Cheng | 2019 | Frontiers of physics2019，14，3： | 2 |
| 4 | Channel-aware and queue-aware joint-layer resource optimization for cognitive radio networks显示文摘An optimization model is derived to maximize the utilization efficiency of the idle channels of primary users(PU) in cognitive radio networks.In the optimization model,Lyapunov optimization method is used to allocate the idle channels of PU to secondary user(SU) most efficiently.The time distribution of the idle channels of PU is predicted by a low-pass time window.An algorithm is proposed to implement the optimization process.The algorithm is efficient because of using a greedy selection mechanism.The efficiency of the algorithm is demonstrated by mathematic analyses and simulation results. | GUO KunQi SUN LiXin LI Yong JIA ShiLou | 2010 | Science China(Information Sciences)2010，53，12： | 2 |
| 5 | Research On A Novel Approach To Multi-axis Line Contact Milling显示文摘 | WANG Kunqi WANG Runxiao YU Binggao ZHANG Changfu | 2006 | International Technology And Innovation Conference2006，，11： | 1 |
| 6 | m6A-TSHub:Unveiling the Context-specific m^(6)A Methylation and m^(6)A-affecting Mutations in 23 Human Tissues显示文摘As the most pervasive epigenetic marker present on mRNAs and long non-coding RNAs(lncRNAs),N6-methyladenosine(m^(6)A)RNA methylation has been shown to participate in essential biological processes.Recent studies have revealed the distinct patterns of m^(6)A methylome across human tissues,and a major challenge remains in elucidating the tissue-specific presence and circuitry of m^(6)A methylation.We present here a comprehensive online platform,m^(6)A-TSHub,for unveiling the context-specific m^(6)A methylation and genetic mutations that potentially regulate m^(6)A epigenetic mark.m^(6)A-TSHub consists of four core components,including(1)m^(6)A-TSDB,a comprehensive database of 184,554 functionally annotated m^(6)A sites derived from 23 human tissues and 499,369 m^(6)A sites from 25 tumor conditions,respectively;(2)m^(6)A-TSFinder,a web server for high-accuracy prediction of m^(6)A methylation sites within a specific tissue from RNA sequences,which was constructed using multi-instance deep neural networks with gated attention;(3)m^(6)ATSVar,a web server for assessing the impact of genetic variants on tissue-specific m^(6)A RNA modifications;and(4)m^(6)A-CAVar,a database of 587,983 The Cancer Genome Atlas(TCGA)cancer mutations(derived from 27 cancer types)that were predicted to affect m^(6)A modifications in the primary tissue of cancers.The database should make a useful resource for studying the m^(6)A methylome and the genetic factors of epitranscriptome disturbance in a specific tissue(or cancer type).m^(6)A-TSHub is accessible at www.xjtlu.edu.cn/biologicalsciences/m^(6)ats. | Bowen Song Daiyun Huang Yuxin Zhang Zhen Wei Jionglong Su João Pedro de Magalhães Daniel J.Rigden Jia Meng Kunqi Chen | 2023 | Genomics, Proteomics & Bioinformatics2023，21，4： | 1 |
| 7 | Photoelectrochemical biofuel cell using porphyrin-sensitized nanocrystalline titanium dioxide mesoporous film as photoanode显示文摘 | Kunqi Wang Jing Yang Ligang Feng Yuwei Zhang Liang Liang Wei Xing Changpeng Liu | 2011 | Biosensors and Bioelectronics2011，，1： | 1 |
| 8 | Efficiency-aware and fairness-aware joint-layer optimization for downlink data scheduling in OFDM显示文摘Efficiency and fairness are two crucial issues to be considered for resource alloca- tion in multi-user wireless networks.Based on the joint optimization of physical layer and data link layer,an optimization model is derived to achieve efficient and fair downlink data scheduling in multi-user OFDM wireless networks by maximizing the total utility function with respect to the average waiting time of user queue.A dynamic sub-carrier allocation algorithm(DSAA)based on the optimization model is proposed in order to obtain the maximization of the total scheduling utility.Effi- ciency is improved by combining DSAA with time scale interference predictor(TSIP) which at large time scales predict ON/OFF period of user data with temporal corre- lation structure across multiple time scales in multi-user interference environment. Simulation results verify the efficiency and fairness of the scheme. | GUO KunQi SUN LiXin WANG Ping JIA ShiLou | 2008 | Science in China(Series F)2008，51，2： | 1 |
| 9 | Differential evolution algorithm based on simulated annealing显示文摘 | Lin Kunqi Du Xin Kang Lishan | 2007 | Lecture Notes in Computer Science2007，4683，： | 1 |
| 10 | Researeh On A Novel Approaeh To Multi-axis Line Contact Milling显示文摘 | WANG Kunqi WANG Runxiao YU Binggao etal | 2006 | International Teehnology And Innovation Conference2006，，11： | 1 |
| 11 | Research On A Novel Approach To Multi-axis Line Contact Milling 显示文摘 | WANG Kunqi WANG Runxiao YU Binggao ZHANG Changfu | 2006 | International Technology And Innovation Conference2006，，11： | 1 |
| 12 | Distribution, modes of occurrence, and main factors influencing lead enrichment in Chinese coals显示文摘Lead is a potentially harmful element that has caused serious environmental pollution during its mining and use along with serious human health problems.This study assessed lead in Chinese coals based on published literature,with a particular focus on data reported since 2004.The analysis included 9447 individual samples from 103 coalfields or mines in 28 provinces in China.The arithmetic mean content of lead in the studied coals was 15.0μg/g.Considering the coal reserves,the weighted-average lead concentration in Chinese coals was calculated to be 19.6μg/g.Lead was significantly enriched in the coals from Henan Province and enriched in the coals from the Tibet Autonomous Region.The coals from Tibet–Western Yunnan and the southern areas of China had elevated lead concentrations.Sulfides are the primary hosts of lead in Chinese coals,although other hosts include silicates,organic matter,carbonates,and other minerals.Source rocks in the sediment-source region and marine environments may be the most significant factors contributing to lead enrichment in Chinese coals.Hydrothermal fluids and peat-forming plants also contribute to lead enrichment in some Chinese coals. | Kunqi Lin Wenhui Huang Robert BFinkelman Jing Chen Shuo Yi Xiaonan Cui Yuanzheng Wang | 2020 | International Journal of Coal Science & Technology2020，7，1： | 1 |
| 13 | Heuristic based data scheduling algorithm for OFDMA wireless network显示文摘A system model based on joint layer mechanism is formulated for optimal data scheduling over fixed point-to-point links in OFDMA ad-hoc wireless networks. A distributed scheduling algorithm (DSA) for system model optimization is proposed that combines the randomly chosen subcarrier according to the channel condition of local subcarriers with link power control to limit interference caused by the reuse of subcarrier among links. For the global fairness improvement of algorithms, a global power control scheduling algorithm (GPCSA) based on the proposed DSA is presented and dynamically allocates global power according to difference between average carrier-noise-ratio of selected local links and system link protection ratio. Simulation results demonstrate that the proposed algorithms achieve better efficiency and fairness compared with other existing algorithms. | Guo Kunqi Sun Lixin Jia Shilou Yu Xiaoyang | 2008 | Journal of Systems Engineering and Electronics2008，19，1： | 0 |
| 14 | Characterization of Self-driven Cascode-Configuration Synchronous Rectifiers显示文摘This paper presents a cascode configuration synchronous rectifier device based on silicon MOSFET and Schottky diode,which can replace traditional power diode directly.This structure has self-driven ability with simple external circuit,and the conduction characteristic is preferable to a power diode.Static characterization and switching behavior analysis of proposed structure are conducted in this paper.The switching process is illustrated in detail using real model which considers the parasitic inductances and the nonlinearity of junction capacitors.The real time internal voltage and current value during switching transition are deduced with the equivalent circuit.To validate the analysis,two voltage specification rectifiers are built.Finally,double-pulse test results and the practical design example verify the performance advantages of proposed structure. | REN Xiaoyong LI Kunqi CHEN Qianhong | 2019 | Transactions of Nanjing University of Aeronautics and Astronautics2019，36，6： | 0 |
| 15 | Toplayer-dependent crystallographic orientation imaging in the bilayer two-dimensional materials with transverse shear microscopy显示文摘Nanocontact properties of two-dimensional(2D)materials are closely dependent on their unique nanomechanical systems,such as the number of atomic layers and the supporting substrate.Here,we report a direct observation of toplayer-dependent crystallographic orientation imaging of 2D materials with the transverse shear microscopy(TSM).Three typical nanomechanical systems,MoS_(2) on the amorphous SiO_(2)/Si,graphene on the amorphous SiO_(2)/Si,and MoS_(2) on the crystallized Al_(2)O_(3),have been investigated in detail.This experimental observation reveals that puckering behaviour mainly occurs on the top layer of 2D materials,which is attributed to its direct contact adhesion with the AFM tip.Furthermore,the result of crystallographic orientation imaging of MoS_(2)/SiO_(2)/Si and MoS_(2)/Al_(2)O_(3) indicated that the underlying crystalline substrates almost do not contribute to the puckering effect of 2D materials.Our work directly revealed the top layer dependent puckering properties of 2D material,and demonstrate the general applications of TSM in the bilayer 2D systems. | Sabir Hussain Rui Xu Kunqi Xu Le Lei Shuya Xing Jianfeng Guo Haoyu Dong Adeel Liaqat Rashid Iqbal Muhammad Ahsan Iqbal Shangzhi Gu Feiyue Cao Yan Jun Li Yasuhiro Sugawara Fei Pang Wei Ji Liming Xie Shanshan Chen Zhihai Cheng | 2021 | Frontiers of physics2021，16，5： | 0 |
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