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| 1 | Background modeling methods in video analysis: A review and comparative evaluation显示文摘 | Yong Xu Jixiang Dong Bob Zhang Daoyun Xu | 2016 | CAAI Transactions on Intelligence Technology2016，1，1： | 4 |
| 2 | Study on establishment of standardized load spectrum on bogie frames of high-speed trains显示文摘Establishing structural load spectrum under actual operating conditions is a major problem in structural fatigue life analysis. This study introduces the load measuring method for the bogie frame structure. The load-measuring frame based on quasi-static can measure different load systems synchronously. The t-test method is employed to evaluate the least test time of deducing the parent distribution. In order to fit the load spectrum distribution accurately, the kernel density estimation method is employed which is based on the sample characteristics. The expansion factor method is used to deduce the maximum load. The formula of standardized load spectrum derives from the deduced maximum load, the linear factor between operating condition length and cumulative frequency and the parent distribution of each load system. The damage consistency criterion is performed by solving the objective function with constraint conditions. The calibrated damage provides a suitable representation of the real damage under actual operating conditions. By processing and analyzing the load spectrum and stress spectrum data of the measured lines, it is verified that the standardized load spectrum established in this paper is superior to the European specification and the Japanese specification in evaluating the fatigue reliability of the structure. | Daoyun Chen Qian Xiao Minghui Mou Shouguang Sun Qiang Li | 2019 | Acta Mechanica Sinica2019，35，4： | 4 |
| 3 | 可满足性问题的归约技术(英文)显示文摘通过一个恰当的归约变换,可以将一个CNF公式变换为另一个具有某种特殊结构或性质的公式,使其两者具有相同的可满足性。一个典型的归约是将一般的CNF公式变换为3-CNF公式。通过构造一些恰当的工具,可以将公式类变换为所要求的正则类。极小不可满足公式具有一个临界特征,公式本身不可满足,从原始公式中删去任意一个子句后得到的公式可满足。我们提供了一种归约技术,通过构造恰当的极小不可满足公式作为工具,将公式类变换为具有正则结构的公式类。研究正则结构的公式的复杂性及性质很有意义。如,将一个从3-CNF公式变换为(34)-CNF公式,这里(34)-CNF公式是指公式中每个子句的长度恰为3,每个变元出现的次数恰为4。因此,(34)-SAT是一个NP-完全问题,并且正则二部图的诸多良好性质对于研究正则结构的SAT问题具有许多潜在的作用。 | Daoyun Xu 许道云 王晓峰 | 2012 | 逻辑学研究2012，5，1： | 3 |
| 4 | Biocompatibility of Mg-Nd-Zn-Zr alloy with rabbit blood显示文摘In this study, in vitro blood biocompatibility of Mg-Nd-Zn-Zr (JDBM) alloy was investigated to determine its suitability as a degradable medical biomaterial. Blood biocompatibility was assessed by blood cell aggregation, platelet adhesion, and protein adsorption. A titanium alloy was used as control. The results showed that the JDBM alloy did not induce significant blood cell aggregation, platelet adhesion, and protein adsorption comparison with the titanium alloy (P>0.05). Our data indicate that the JDBM alloy has excellent in vitro blood compatibility, and thus can be considered as a potential degradable biomaterial for medical applications with respect to hemocompatibility. | WANG YongPing OUYANG YuanMing HE YaoHua CHEN DaoYun JIANG Yao MAO Lin NIU JiaLin ZHANG Jian YUAN GuangYin | 2013 | Chinese Science Bulletin2013，58，23： | 2 |
| 5 | Influence of Nano-Al_2O_3 on Properties of Magnesia Chrome Refractories显示文摘Magnesia chrome bricks were prepared with fused MgO-Cr2O3 synthesized material,fused magnesite and chrome ore as main starting materials. Nano-Al2O3 was added into refractories ( 2% ,4% and 6% in mass) substituting for Al2O3 micropowder. After mixing and shaping,the bricks were fired at 1 550 ℃ ,1 600 ℃ , 1 650 ℃ and 1 750 ℃ ,respectively. The microstruc-ture,sintering property,mechanical properties,thermal shock resistance and slag resistance of the specimens with the addition of nano-Al2O3 were investigated. The re-sults indicate that the performance of brick with 4 mass% of nano-Al2O3 is greatly improved after firing at 1 650 ℃ . | ZHANG Daoyun IIANG Mingxue XIAO Guoqing HUANG Shaobo | 2012 | China's Refractories2012，21，2： | 1 |
| 6 | Biocompatibility of magnesium-zinc alloy in biodegradable orthopedicimplants显示文摘 | Daoyun Chen Yaohua He Hairong Tao Yan Zhang Yao Jiang Xiaonong Zhang Shaoxiang Zhang | 2011 | International Journal of Molecular Medicine2011，，3： | 1 |
| 7 | Thiazide-like diuretics attenuate agonist-induced vasoconstriction by calcium desensitization linked to Rho kinase显示文摘 | ZHU Zhiming ZHU Shanjun LIU Daoyun | | 0，，02： | 1 |
| 8 | Ultra-broadband near infrared phosphor with wide spectral range and long peak wavelength achieved by double-site occupation显示文摘The miniaturization and intelligence of near infrared(NIR)devices urgently require an excellent broadband NIR phosphor.However,emission spectra of most NIR phosphors cover less than 1200 nm with a full width at half maximum(FWHM)less than 200 nm and a peak wavelength less than 900 nm.Here,we successfully developed ultra-broadband NIR phosphors ScNbO_(4):Cr^(3+)which can overcome the above shortcomings based on a double-site occupancy strategy.The phosphors achieve ultra-broadband NIR emission from 800 to 1400 nm with a peak wavelength at 980 nm.Its FWHM is up to 217 nm.The valence state of Cr ions in phosphors was analyzed.The double-site occupancy of Cr^(3+)ions in the host and the relationship between host structure and optical properties are discussed in detail.NIR light transmission experiments show that phosphors have potential application value in non-destructive analysis.This work develops an excellent NIR luminescent material and provides an efficient method to obtain ultra-broadband NIR phosphors with longer peak wavelength. | Shuwen Yuan Fugen Wu Jin Wang Lulu Lou Shuang Zhao Daoyun Zhu Zhongfei Mu | 2023 | Journal of Rare Earths2023，41，11： | 1 |
| 9 | 显示文摘 | Zhu Daoyun Zheng Changxi Liu Yi | 2006 | Surf Coat Technol2006，201，： | 1 |
| 10 | Grinding-Hardening of Face Gears Under Minimum Quantity Lubrication with Disc Wheels显示文摘To shorten the process of face gears,the grinding-hardening effect experiment of face gears under minimum quantity lubrication(MQL)was carried out.Firstly,the grinding method of face gears was analyzed based on the envelope principle,and the control equation of grinding movement was constructed.Secondly,the distribution ratio equation of heat flux density was established,and the theoretical calculation formula of triangle heat source was derived.Thirdly,since a MATLAB calculation program was compiled,the temperature change law under MQL grinding was analyzed.In the end,the influence of grinding parameters on the grinding-hardening layer depth was analyzed.The results demonstrate that MQL grinding achieves the grinding-hardening effect. | Yanzhong Wang Guoying Su Daoyun Qiao Weiwei Feng Yuxia Pei | 2020 | Journal of Beijing Institute of Technology2020，29，4： | 0 |
| 11 | An algorithm for solving satisfiability problem based on the structural information of formulas显示文摘1 Introduction The propositional satisfiability(SAT)problem is an important and prototypical NP-hard problem in theoretical computer science[1].Many efforts have been made for designing high-performance SAT solvers.The existing practical techniques for solving SAT problems are mainly divided into two categories:complete search technique and stochastic local search technique. | Zaijun ZHANG Daoyun XU Jincheng ZHOU | 2021 | Frontiers of Computer Science2021，15，6： | 0 |
| 12 | Satisfiability threshold of the random regular(s,c,k)-SAT problem显示文摘1Introduction The satisfiability(SAT)problem is always a core problem in the field of computer science.Its theoretical and applied research have long been the common attention of many scholars in the field of artificial intelligence and mathematical logic.In the real world,all issues related to combinatorial optimization and coordination verification are closely related to SAT problem. | Xiaoling MO Daoyun XU Kai YAN Zaijun ZHANG | 2022 | Frontiers of Computer Science2022，16，3： | 0 |
| 13 | Strength Evaluation of a Bogie Frame by Different Methods显示文摘Some crucial loads that current strength design specifications have not taken into ac-count are also considered when assessing the strength of a bogie frame.Calculation methods of these loads come from load analysis.Finite element simulation and fa-tigue test rig have been used to assess static strength and fatigue strength of a bogie frame.In addition to the two methods,actual running test is also used to assess bogie frame fatigue strength.In finite element simulation method,endurance limit and modified Goodman fatigue limit diagram are two important tools to judge whether fatigue strength of a bogie frame meets requirement.In actual running test method,Miner linear cumulative damage rule is used to assess bogie frame fatigue strength.Endurance limit and modified Goodman fatigue limit diagram are two effective tools to judge fatigue strength of the frame.For the measured dynamic stress data,Miner linear cumulative damage rule seems to be very effective when judging fatigue strength of the frame.All the above methods have proved that static and fatigue strength of the tested bogie frame meets requirement. | Daoyun Chen Shouguang Sun Qiang Li | 2019 | Mechanical Engineering Science2019，1，1： | 0 |
| 14 | Evolution of Overlap in Hopfield Network with Continuous Transfer Function显示文摘The evolution of overlap which is easily obtained in Hopfield neural network with continuous hyperbolic tangent thresholding function is equivalent to that in corresponding two-state neural network with finite temperature.The attractors of two simple cases,the Hopfield model with independent random patterns and pair correlated patterns,are analyzed. | JI Daoyun ZHOU Changqi CHEN Tianlun | 1994 | Chinese Physics Letters1994，11，6： | 0 |
| 15 | Application of Fourier Transform in Signal Processing显示文摘Fourier transform is a special integral transformation. The Fourier transform transforms the signal from the time domain to the frequency domain, and the frequency domain method has many outstanding advantages compared with the classical time domain method. Although Fourier analysis is not the only transform domain method in the field of information science and technology, it has to be recognized that Fourier transform analysis has always been widely used in this field. Fourier transform is used to realize the filtering, modulation and sampling of the signal, which is the most important application of Fourier transform in signal processing. Through the modulation of the signal can be low-frequency components of the signal modulation to high frequency, to achieve the spectrum shift, to reduce inter-code crosstalk, improve the new noise resistance, is conducive to long-distance transmission of the signal. In addition, the signal sampling can be continuous signal discretization, help to use the computer to deal with the signal. In short, Fourier transform has a very important role in signal processing, learning Fourier transform is the basis for learning other frequency domain transformations. | Lina Sun Derong You Daoyun Qi | 2018 | Signal and Information Processing2018，1，1： | 0 |
| 16 | Properties of the satisfiability threshold of the strictly d-regular random(3,2s)-SAT problem显示文摘A k-CNF(conjunctive normal form)formula is a regular(k,s)-CNF one if every variable occurs s times in the formula,where k≥2 and s>0 are integers.Regular(3,s)-CNF formulas have some good structural properties,so carry-ing out a probability analysis of the structure for random formulas of this type is easier than conducting such an analysisfor random 3-CNF formulas.Some subclasses of the regular(3,s)-CNF formula have also characteristics of intractabilitythat differ from random 3-CNF formulas.For this purpose,we propose strictly d-regular(k,2s)-CNF formula,which is aregular(k,2s)-CNF formula for which d≥0 is an even num-ber and each literal occurs s-d/2 or s+d/2 times(the literals from a variable x are x and-x,where x is positive and-x isnegative).In this paper,we present a new model to generatestrictly d-regular random(k,2s)-CNF formulas,and focuson the strictly d-regular random(3,2s)-CNF formulas.Let F be a strictly d-regular random(3,2s)-CNF formula suchthat 2s>d.We show that there exists a real number so suchthat the formula F is unsatisfiable with high probability whens>so,and present a numerical solution for the real numberso.The result is supported by simulated experiments,and isconsistent with the existing conclusion for the case of d=0.Furthermore,we have a conjecture:for a given d,the strictlyd-regular random(3,2s)-SAT problem has an SAT-UNSAT(satisfiable-unsatisfiable)phase transition.Our experimentssupport this conjecture.Finally,our experiments also showthat the parameter d is correlated with the intractability of the 3-SAT problem.Therefore,our research maybe helpful for generating random hard instances of the 3-CNF formula. | Yongping WANG Daoyun XU | 2020 | Frontiers of Computer Science2020，14，6： | 0 |
| 17 | Broadening and enhancing emission of Cr^(3+) simultaneously by co-doping Yb^(3+) in Ga1.4ln0.6SnO5显示文摘Cr^(3+)doped broadband near-infrared(NIR) emitting phosphors are currently the focus of research.Researchers have developed a variety of strategies to achieve broad and strong NIR emission,However,it is a conundrum to simultaneously broaden and enhance the emission of Cr^(3+)with a single strategy,In this work,we solved this problem by co-doping Yb^(3+).Under 452 nm excitation,Ga_(1.4)In_(0.6)SnO_(5)(GISO):0.01Cr^(3+)shows ultrabroadband NIR emission covering 650-1300 nm with a peak of 884 nm,The full width half maximum(FWHM) of the emission is 215 nm and the internal quantum yield(IQY) is 25%.This indicates that the double sites occupation strategy is favorable to achieve ultra-broadband NIR emission.The co-doping of Yb^(3+)can effectively broaden and enhance the emission of Cr^(3+).The FWHM for GISO:0.01Cr^(3+),0.002Yb^(3+)extends to 245 nm,and the IQY increases to 28%.Further increasing the concentration of Yb^(3+)to 0.005,the IQY is lifted to 32%.Finally,a phosphor-co nverted light emitting diode(pc-LED) was prepared by integrating the GISO:0.01Cr^(3+),0.002Yb^(3+)with a blue light chip.Under the current drive of 40 mA,the maximum output power of pc-LED is 4.54 mW,and the photoelectric conversion efficiency is 4.12%.These results indicate that Yb^(3+)ions can simultaneously broaden the emission band and improve the emission efficiency.This work provides an effective strategy for the design of efficient broadband NIR phosphors in the future. | Shuang Zhao Zhongfei Mu Lulu Lou Shuwen Yuan Min Liao Qiuming Lin Daoyun Zhu Fugen Wu | 2023 | Journal of Rare Earths2023，41，12： | 0 |
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