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Blind Spectrum Selection in a Decentralized Cognitive Radio Networks with Heterogeneous Applications
Yongqun Chen,Huaibei Zhou,Ruoshan Kong,Junyuan Huang,Hang Qin 보안공학연구지원센터 2016 International Journal of Signal Processing, Image Vol.9 No.2
In this paper, we consider a cognitive radio network in which the sensing ability of cognitive radio is limited and the channel statistics are not known as a priori information in the opportunistic spectrum access(OSA) framework. It is a special challenge to design a joint spectrum sensing and access strategy for secondary users with diverse service requirements of heterogeneous applications, i.e. the real-time applications and best-effort applications. We formulate the spectrum decision problem as a decentralized multi-armed bandit problem and propose slot structures for cognitive radio network to cope with collisions between heterogeneous applications. The proposed scheme is proved achieving logarithmic regrets in time asymptotically and simulation results show that each user orthogonalizes into their rank-optimal channels according to their pre-allocated priorities, which indicates efficient spectrum utilization while satisfying service requirements.
Construction Mechanism of Reticular Structure of Plant Fiber
Yongqun Xie,Queju Tong,Yan Cheon 한국가구학회 2008 한국가구학회지 Vol.19 No.2
This paper investigated and validated the mechanisms and principles for constructing reticular structure of plant fiber through frothing solution approach. After process, plant fibers became low-density reticular-structured block with all properties meeting Chinese standards for cushion packing materials. The bonds between fibers acted as knots in a truss and were strong enough to keep space occupied by bubbles in the frothing solution from shrinking in the subsequent draining process. The formation of the reticular structure depends mainly on the pressure difference between inside and outside bubble, the effect of surface adsorbent force on bubble film, and hydrogen bond among fiber hydroxide.
SOME EQUALITIES FOR CONTINUED FRACTIONS OF GENERALIZED ROGERS-RAMANUJAN TYPE
Yongqun Li,Xiantao Wang 대한수학회 2011 대한수학회지 Vol.48 No.5
In this paper, we rst discuss the convergence of the con-tinued fractions of generalized Rogers-Ramanujan type in the modied sense. Then we prove several equalities concerning these continued frac-tions. The proofs of our main results are mainly based on the Bauer-Muir transformation.
SOME EQUALITIES FOR CONTINUED FRACTIONS OF GENERALIZED ROGERS-RAMANUJAN TYPE
Li, Yongqun,Wang, Xiantao Korean Mathematical Society 2011 대한수학회지 Vol.48 No.5
In this paper, we first discuss the convergence of the continued fractions of generalized Rogers-Ramanujan type in the modified sense. Then we prove several equalities concerning these continued fractions. The proofs of our main results are mainly based on the Bauer-Muir transformation.
Construction Mechanism of Reticular Structure of Plant Fiber
Xie, Yongqun,Tong, Queju,Chen, Yan Korea Furniture Society 2008 한국가구학회지 Vol.19 No.2
This paper investigated and validated the mechanisms and principles for constructing reticular structure of plant fiber through frothing solution approach. After process, plant fibers became low-density reticular-structured block with all properties meeting Chinese standards for cushion packing materials. The bonds between fibers acted as knots in a truss and were strong enough to keep space occupied by bubbles in the frothing solution from shrinking in the subsequent draining process. The formation of the reticular structure depends mainly on the pressure difference between inside and outside bubble, the effect of surface adsorbent force on bubble film, and hydrogen bond among fiber hydroxide.
Li Yao,Yongqun Zhu,Wenzhi Xu,Hong Wang,Xie Wang,Jianhua Zhang,Haitao Liu,Chaowen Lin 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.72 No.-
In this study, the combination of dispersive solid phase extraction (DSPE) with dispersive liquid–liquidmicroextraction (DLLME) was proposed as a novel sequential speciation method for Cr determination bygraphite furnace atomic absorption spectrometry. In thefirst step, the selective extraction of Cr(III) byDSPE was achieved using graphene oxide (GO) nanoparticles as the adsorbent. The difficulty of separationand collection of GO in analytical performance was solved by the introduction of the syringe nanofilter. Then Cr(VI) was enriched by DLLME using [Omim] [PF6] as the extraction solvent. The experimentalparameters affecting the performance of both preconcentration methods were investigated andoptimized. Under the optimal conditions including the initial pH value of 7, 150 mg GO, 2 min ultrasoundtime, 210 mL elution solvent (first step), secondary pH value of 4, 0.15% (m/v) Aliquat-336, 120 mL of[Omim] [PF6] and 3 min ultrasound time (second step), the linear range of 0.06–5 ng/mL (R > 0.997), thelimits of detection of 0.015 and 0.02 ng/mL were achieved for Cr(III) and Cr(VI), respectively. The relativestandard deviations (n = 5) of 0.6 ng/mL Cr(III) and Cr(VI) were 3.2% and 4.6%, respectively. Finally, thisnewly developed method was applied for the speciation and determination of Cr species in differentwater samples and satisfactory results were obtained.
Zhenzeng Wu,Tingjie Chen,John Tosin Aladejana,Yves Kouomo Guelifack,Dehong Li,Xinjun Hou,Xiaodong (Alice) Wang,Min Niu,Yongqun Xie 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.98 No.-
Fire safety issues have attracted much attention since they cause enormous loss of lives and properties. Inthis study, the sustainable aluminophosphate (AP) adhesive is developed as afire retardant for improvingthefire performance of medium-densityfiberboard (MDF). The properties of AP adhesive and AP-basedMDF were evaluated based on a scanning electron microscope, thermogravimetric analysis, X-raydiffraction, X-ray photoelectron spectroscopy, and cone calorimetry. The thermostability andfireperformance of MDF are significantly improved by the deposition of the AP inorganic layer on the woodfibers surface, which could protect woodfibers from further oxidation and take away part of the heat. Compared to control sample (UF sample), the pkHRR (151.7 kW m 2), THR (66.0 MJ m 2), TTI (21 s), andmean EHC (14.6 MJ kg 1) of AP-based MDF was reduced by 52.7%, 39.0%, 41.7%, and 32.8%, respectively. Also, the existence of the AP inorganic layer is beneficial to netting the solid phase and volatileflammablecomponents in char residue of MDF, resulting in large mass loss rate, off-gases (CO and CO2) release andsmoke suppression properties. Therefore, AP could improve thefire performance of MDF.