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| 1 | Cognitive Frequency Hopping Sequences显示文摘Since the immutable conventional Frequency hopping(FH) sequence cannot keep high FH communication reliability in complex electromagnetic environment, we propose an algorithm that can generate high-performance Cognitive frequency hopping sequence(CFHS) for Cognitive frequency hopping(CFH) system.By employing the pseudo-random perturbation mapping,the CFHS is generated by remapping the block cipher FH sequence with the adaptive frequency slot number and frequency gap. The CFHS inherits the great integrated performance and its parameters could change with the electromagnetic environment. The statistics properties of Markov and uniformity are analyzed based on the Markov process theory and probability theory. Simulation results show that CFHS outperforms the widely-used FH sequences on the performance of uniformity, randomness, Hamming correlation, complexity and sensitivity. The proposed CFHS could be extensively applied in high reliable CFH system. | GUAN Lei LI Zan HAO Benjian SI Jiangbo NING Ben | 2016 | Chinese Journal of Electronics2016，25，1： | 3 |
| 2 | A new complexity metric for FH/SS sequences using fuzzy entropy显示文摘This paper presents a new complexity metric to evaluate the unpredictability of a frequencyhopping/spread-spectrum (FH/SS) sequence based on fuzzy entropy (FuzzyEn).According to the property of the FS/SS sequence,the definition of a fuzzy membership function for a complexity metric is presented and a basic theorem for FuzzyEn complexity is proved.Simulation and analytical results show that the proposed FuzzyEn works and can effectively discern the changing complexities of the FH/SS sequences,which are compared with a complexity metric based on approximate entropy (ApEn).The FuzzyEn scheme has obvious advantages in robustness to resolution parameters and sensitivity to vector dimensions. | CHEN XiaoJun SI JiangBo LI Zan CAI JuePing BAI BaoMing | 2011 | Science China(Information Sciences)2011，54，7： | 2 |
| 3 | On the performanceof cognitive relay networks under primary user’soutage constraint显示文摘 | Si Jiangbo Li Zan Cheng Xiaojun | 2011 | IEEE Communications Letters2011，15，4： | 1 |
| 4 | Generation and characterization of orthogonal FH sequences for the cognitive network显示文摘The existing orthogonal frequency hopping(FH) sequence cannot support the high throughput and high spectrum efficient cognitive FH(CFH) network due to its small family size, high computational complexity and short period. To overcome these disadvantages, this paper investigates the generation of the orthogonal FH sequence and analyzes its multiple accessibility performance based on the CFH frequency division multipleaccess(FDMA) network model. By the random mapping and cyclical shift replacement(CSR) scheme, a large family size of orthogonal FH sequence with dynamic frequency slot number is generated. In this case, the external interference could be eliminated by avoiding the interfered frequencies, and blocking mutual interference incurred for the packet by the orthogonal frequencies. Moreover, the theoretical relationships of the throughput and transmission delay with respect to the user number and the packet arrival rate are given, which shows that our proposed orthogonal FH sequence could support high throughput and short packet transmission delay in CFH-FDMA network. The simulation results validate our theoretical analysis of the CFH-FDMA network performance, and show that our proposed sequence outperforms the widely used no hit zone FH sequences in terms of uniformity, randomness, Hamming correlation, complexity and sensitivity, etc. | GUAN Lei LI Zan SI JiangBo HUANG YangChao | 2015 | Science China(Information Sciences)2015，58，2： | 1 |
| 5 | Designing polyoxometalate-based metal-organic framework for oxidation of styrene and cycloaddition of CO_(2) with epoxides显示文摘A photoactive polyoxometalate-based metal-organic framework (POMOF),NiW-DPNDI,was synthesized by combination of Ni(Ⅱ) ions,[ZnW_(12)O_(40)]^(6–)anions,and N,N’-bis(4-pyridylmethyl)naphthalene diimide(DPNDI) molecules into one single framework.Ni W-DPNDI displays a three-dimensional structure by the strong anion···π interactions between the trapped[ZnW_(12)O_(40)]^(6–)anions and the electron-deficient naphthalenic ring centroids and theπ-πstacking interactions between DPNDI moieties.Ni W-DPNDI displayed a highly efficient hole-electron separation and ordered electron transfer under irradiation,thus ensuing its excellent photocatalysis in oxidation of styrene to produce benzaldehyde.In addition,it gave a high efficiency for styrene oxide under thermocatalytic conditions.Because the carbonic anhydrase (CA)-mimicking Ni sites and the negative electron-enriched[ZnW_(12)O_(40)]^(6–)anions are well aligned in the pores,it can promote the cycloaddition of CO_(2) with epoxides under mild conditions. | Xiaomei Yan Jiangbo Xu Ting Zhang Chen Si Jiachen Jiao Jie Li Qiuxia Han | 2023 | Chinese Chemical Letters2023，34，7： | 0 |
| 6 | Influence of Sealing Treatments with Ultrasonic Excitation on Corrosion Resistance of Plasma-sprayed Al_2O_3-13wt%TiO_2 Coatings显示文摘A series of plasma-sprayed Al2O3-13wt%TiO2(AT13)coatings were sealed with silicone resin by using impregnating with and without ultrasonic excitation methods,respectively.And,sealing treatments with ultrasonic excitation(UE)were performed at different temperatures.The corrosion behaviors of the sealed AT13 coatings were investigated by immersion corrosion tests.The microstructure and porosity of the coatings were characterized.The porosity of the AT13 coatings decreases after sealing treatments and the coatings sealed with ultrasonic excitation have the lowest porosity.The result of immersion corrosion in 10vol%HCl aqueous solutions shows that most of UE-sealed coatings have lower weight losses value than that of the coatings sealed by conventional impregnating(CI).The ultrasonic excitation was useful for decreasing the opposing force acting against impregnation driven by moisture and air from pores and cracks,and accelerating the fluidity of sealant,which made the sealant penetrate deeply into the inner part of pores and cracks.All the results indicate that the corrosion resistance of plasma-sprayed AT13 coatings can be effectively improved by sealing treatments with ultrasonic excitation. | Si Liqiong,Wang Zehua,Zhou Zehua,Jiang Shaoqun,Cheng Jiangbo,Wang Gang Hohai University,Nanjing,210098,China | 2012 | 稀有金属材料与工程2012，41，S1： | 0 |
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