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Landscape structures of the Central Yangtze region, China
Tang, Zhi Yao,Fang, Jing Yun,Zhao, Shu Qing,Rao, Sheng,Lei, Guang Chun,Cui, Hai Ting 대한원격탐사학회 2000 International Symposium on Remote Sensing Vol.16 No.1
As habitats for many migratory birds, the plain regions of Central Yangtze plays an important role in biodiversity conservation, especially in conservation for birds and fishes. In this study, the landscape structures of the plain regions of the Central Yangtze were analyzed by using remote sensing image data (Landsat TM) and technique of geographical information system (GIS). The landscape component was divided into eight types, broad-leaved forest, shrub, meadow, water body, cropland, urban and bared land. The main results are summarized as follow: (1) Broad-leaved forest is almost made of small patches, while water body and cropland mainly made of large-area patches, suggesting that water body and cropland are the dominant components for landscape structures. (2) Shrub and meadow are highly fragmented, compared to cropland and water body. Water body, meadow and shrub are randomly distributed, whilst bared land and urban occur aggregately. (3) Places with high fragmentation index show a low dominance index value and unapparent dominant components, while the areas with low fragmentation indices, such as Dongting Lake, Poyang Lake and Jianghan Plain, indicate a high dominance index value in which the dominant components were distinct.
Tang, Chang-Quan,Tang, Rui-Ren,Tang, Chun-Hua,Zeng, Zhi-Wen Korean Chemical Society 2010 Bulletin of the Korean Chemical Society Vol.31 No.5
A novel polyaminopolycarboxylate ligand with many coordination sites, N,N,$N^1,N^1,N^2,N^2$-[( 2,4,6-tri(aminomethyl)-pyridine]hexakis(acetic acid) (TPHA), was designed and synthesized and its lanthanide complexes $Na_6Tb_2$(TPHA)$Cl_6{\cdot}14H_2O$, $Na_6Eu_2$(TPHA)$Cl_6{\cdot}8H_2O$, $Na_6Gd_2$(TPHA)$Cl_6{\cdot}11H_2O$ and $Na_6Sm_2$(TPHA)$Cl_6{\cdot}9H_2O$ were successfully prepared. The ligand and the complexes were characterized by elemental analysis, IR, mass, NMR and TG-DTA. The TG-DTA studies indicated that the complexes had a high thermal stability, whose initial decomposition temperature was over $270^{\circ}C$. The luminescence properties of the complexes in solid state were investigated and the results suggested that $Tb^{3+}$ and $Eu^{3+}$ ions could be sensitized efficiently by the ligand, especially the Tb(III) complex displayed a very strong luminescence intensity (> 10000) and only displayed characteristic metal-centered luminescence. Also, the correlative comparison between the structure of ligand and luminescence properties showed how the number of the coordination atoms of ligand can be a prominent factor in the effectiveness of ligand-to-metal energy transfer.
( Zhi-ling Tang ),( Si-min Li ) 한국인터넷정보학회 2017 KSII Transactions on Internet and Information Syst Vol.11 No.6
The main processes of a cognitive radio system include spectrum sensing, spectrum decision, spectrum sharing, and spectrum conversion. Experimental results show that these stages introduce a time delay that affects the spectrum sensing accuracy, reducing its efficiency. To reduce the time delay, the frequency spectrum prediction was proposed to alleviate the burden on the spectrum sensing. In this paper, the deep recurrent neural network (DRNN) was proposed to predict the spectrum of multiple time slots, since the existing methods only predict the spectrum of one time slot. The continuous state of a channel is divided into a many time slots, forming a time series of the channel state. Since there are more hidden layers in the DRNN than in the RNN, the DRNN has fading memory in its bottom layer as well as in the past input. In addition, the extended Kalman filter was used to train the DRNN, which overcomes the problem of slow convergence and the vanishing gradient of the gradient descent method. The spectrum prediction based on the DRNN was verified with a WiFi signal, and the error of the prediction was analyzed. The simulation results proved that the multiple slot spectrum prediction improved the spectrum efficiency and reduced the energy consumption of spectrum sensing.
A Bottom-up Algorithm for XML Twig Queries
Tang Zhi-xian,Feng Jun,Xu Li-ming,Shi Ya-qing 보안공학연구지원센터 2015 International Journal of Database Theory and Appli Vol.8 No.4
Twig query is a core operation in processing and optimizing XML structural queries. Recently, various algorithms have been proposed for finding twig patterns efficiently. Most of them are based on region labeling, pay little attention on nodes level information, and require additional caches such as stacks or lists to maintain the intermediate matching results, which cause the performance bottleneck of these algorithms. In contrast to previous work, we present a bottom-up algorithm for twig queries, which does not require additional caches and introduces idea of string searching to determine binary relationship between two nodes. Be- sides, this paper presents a node filtering mechanism–PathLevel, which can also be used in other algorithms for speeding up the query. Comprehensive experiments on several datasets demonstrate our method is an effective way for twig query.
A CPU-GPGPU Based Multithread File Chunking System
단지(Zhi Tang),원유집(Youjip Won) 한국정보과학회 2011 한국정보과학회 학술발표논문집 Vol.38 No.1B
The popularity of general purpose GPU(GPGPU)makes the CPU-GPGPU heterogeneous archite cture normal. Therefore, tradeoff the usage of CPU and GPGPU becomes a way to improve perfor mance of programs. In this work, we exploit the properties of the CPU-GPGPU heterogeneous arc hitecture and use them to accelerate the content based chunking operation of deduplication. We built a prototype system which is able to coordinate CPU and GPGPU to chunk file and has been proven to have a better performance compared to using either CPU or GPGPU alone.
Hao Tang,Nian-Guang Li,Zhi-Hao Shi,Yu-Ping Tang,Qian-Ping Shi,Ze-Xi Dong,Peng-Xuan Zhang,Jin-ao Duan 대한약학회 2015 Archives of Pharmacal Research Vol.38 No.10
The binding abilities of scutellarin (Scu) andscutellarein (Scue) with bovine serum albumin (BSA) wereinvestigated using equilibrium dialysis, high performanceliquid chromatography, fluorescence spectroscopy, competitivesite marker and molecular docking. The resultsshowed that the average protein binding ratios of Scu andScue with BSA were (79.85 ± 1.83) and (85.49 ± 1.21) %respectively. Under simulated physiological conditions, thefluorescence data indicated that Scu and Scue bound withBSA through a static mechanism. The thermodynamicparameters indicated that the interactions of Scu-BSA andScue-BSA mainly occurred by van der Waals forces andhydrogen bonds and it was easier for Scue to bind withBSA than Scu, indicating that the glucuronic acid moleculein Scu decreased the binding affinity. Site competitivemarker experiments showed that the binding sites of Scuand Scue mainly located within the sub-domain IIA ofBSA. Furthermore, molecular docking studies indicatedthat one BSA could bind three Scue, while one BSA couldcarry only two Scu. All these results clearly indicated theinteractions of Scu and Scue with BSA, which will lay thefoundation for further research to determine the pharmacologyand pharmacodynamics of Scu and Scue for treatingischemic cerebrovascular disease.
Chang-quan Tang,Rui-ren Tang,Chun-hua Tang,Zhi-wen Zeng 대한화학회 2010 Bulletin of the Korean Chemical Society Vol.31 No.5
A novel polyaminopolycarboxylate ligand with many coordination sites, N,N,N1,N1,N2,N2-[( 2,4,6-tri(aminomethyl)-pyridine]hexakis(acetic acid) (TPHA), was designed and synthesized and its lanthanide complexes Na6Tb2(TPHA)Cl6·14H2O, Na6Eu2(TPHA)Cl6·8H2O, Na6Gd2(TPHA)Cl6·11H2O and Na6Sm2(TPHA)Cl6·9H2O were successfully prepared. The ligand and the complexes were characterized by elemental analysis, IR, mass, NMR and TG-DTA. The TG-DTA studies indicated that the complexes had a high thermal stability, whose initial decomposition temperature was over 270 oC. The luminescence properties of the complexes in solid state were investigated and the results suggested that Tb3+ and Eu3+ ions could be sensitized efficiently by the ligand, especially the Tb(III) complex displayed a very strong luminescence intensity (> 10000) and only displayed characteristic metal-centered luminescence. Also, the correlative comparison between the structure of ligand and luminescence properties showed how the number of the coordination atoms of ligand can be a prominent factor in the effectiveness of ligand-to-metal energy transfer.