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Search Results: 1 - 10 of 59408 matches for " Tingting Yang "
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A Study of Multi-Node and Dual-Hop Collaborative Communication Performance Based on Harmonic Mean Method  [PDF]
Tingting YANG, Shufang ZHANG
Communications and Network (CN) , 2009, DOI: 10.4236/cn.2009.11006
Abstract: Closed form expressions for the PDF and MGF of the harmonic mean of two independent exponential variates are cited and derived, and then applied to study the performance of cellular multi-node and dual-hop cooperative communication systems with non-regenerative relays over flat Rayleigh fading channels. We derive the probability density function (PDF) and asymptotic symbol error rate (SER) expression with MRC scheme. Then we use Matlab to simulate the performance.
Analysis of Five Typical Localization Algorithms for Wireless Sensor Networks  [PDF]
Shelei Li, Xueyong Ding, Tingting Yang
Wireless Sensor Network (WSN) , 2015, DOI: 10.4236/wsn.2015.74004
Abstract: In this paper, the self-localization problem is studied. It is one of the key technologies in wireless sensor networks (WSNs). And five localization algorithms: Centroid algorithm, Amorphous algorithm, DV-hop algorithm, APIT algorithm and Bounding Box algorithm are discussed. Simulation of those five localization algorithms is done by MATLAB. The simulation results show that the positioning error of Amorphous algorithm is the minimum. Considering economy and localization accuracy, the Amorphous algorithm can achieve the best localization performance under certain conditions.
On the Feasibility of Linear Interference Alignment for MIMO Interference Broadcast Channels with Constant Coefficients
Tingting Liu,Chenyang Yang
Mathematics , 2012, DOI: 10.1109/TSP.2013.2248005
Abstract: In this paper, we analyze the feasibility of linear interference alignment (IA) for multi-input-multi-output (MIMO) interference broadcast channel (MIMO-IBC) with constant coefficients. We pose and prove the necessary conditions of linear IA feasibility for general MIMO-IBC. Except for the proper condition, we find another necessary condition to ensure a kind of irreducible interference to be eliminated. We then prove the necessary and sufficient conditions for a special class of MIMO-IBC, where the numbers of antennas are divisible by the number of data streams per user. Since finding an invertible Jacobian matrix is crucial for the sufficiency proof, we first analyze the impact of sparse structure and repeated structure of the Jacobian matrix. Considering that for the MIMO-IBC the sub-matrices of the Jacobian matrix corresponding to the transmit and receive matrices have different repeated structure, we find an invertible Jacobian matrix by constructing the two sub-matrices separately. We show that for the MIMO-IBC where each user has one desired data stream, a proper system is feasible. For symmetric MIMO-IBC, we provide proper but infeasible region of antenna configurations by analyzing the difference between the necessary conditions and the sufficient conditions of linear IA feasibility.
On the Degrees of Freedom of Asymmetric MIMO Interference Broadcast Channels
Tingting Liu,Chenyang Yang
Computer Science , 2013,
Abstract: In this paper, we study the degrees of freedom (DoF) of the asymmetric multi-input-multi-output interference broadcast channel (MIMO-IBC). By introducing a notion of connection pattern chain, we generalize the genie chain proposed in [11] to derive and prove the necessary condition of IA feasibility for asymmetric MIMO-IBC, which is denoted as irreducible condition. It is necessary for both linear interference alignment (IA) and asymptotic IA feasibility in MIMO-IBC with arbitrary configurations. In a special class of asymmetric two-cell MIMOIBC, the irreducible condition is proved to be the sufficient and necessary condition for asymptotic IA feasibility, while the combination of proper condition and irreducible condition is proved to the sufficient and necessary condition for linear IA feasibility. From these conditions, we derive the information theoretic maximal DoF per user and the maximal DoF per user achieved by linear IA, and these DoFs are also the DoF per user upper-bounds of asymmetric G-cell MIMO-IBC with asymptotic IA and linear IA, respectively.
Genie Chain and Degrees of Freedom of Symmetric MIMO Interference Broadcast Channels
Tingting Liu,Chenyang Yang
Computer Science , 2013,
Abstract: In this paper, we study the information theoretic degrees of freedom (DoF) for symmetric multi-input-multi-output interference broadcast channel (MIMO-IBC) with arbitrary configuration. We find the maximal DoF achieved by linear interference alignment (IA), and prove when linear IA can achieve the information theoretic maximal DoF. Specifically, we find that the information theoretic DoF can be divided into two regions according to the ratio of the number of antennas at each base station (BS) to that at each user. In Region I, the sum DoF of the system linearly increases with the number of cells, which can be achieved by asymptotic IA but not by linear IA, where infinite time/frequency extension is necessary. In Region II, the DoF is a piecewise linear function, depending on the number of antennas at each BS or that at each user alternately, which can be achieved by linear IA without the need of infinite time/frequency extension, and the sum DoF cannot exceed the sum number of antennas at each BS and each user. We propose and prove the information theoretic DoF upper-bound for general MIMO-IBC including the system settings in Regions I and II, by constructing a useful and smart genie chain. We prove the achievability of the upper-bound in Region II by proposing a unified way to design closed-form linear IA. From the proof we reveal when proper systems are feasible or infeasible and explain why. The approach of the proof can be extended to more general asymmetric MIMO-IBC.
Analysis of Chemical Composition Characteristics and Cause of Formation of Karst Water of Taiyuan Formation in the Lower Part of the Coal Seam in Panxie Mining Area  [PDF]
Tingting Yang, Guangquan Xu
Open Journal of Geology (OJG) , 2019, DOI: 10.4236/ojg.2019.99035
Abstract: Huainan mining area is located in the southern margin of the North China Plate, which is an important coal-producing base in the eastern part of China, its deep coal seam mining is threatened by karst water inrush disasters in the bottom plate, analyzing hydrogeochemical characteristics and exploring its causes are an important prerequisite for preventing karst water hazards in the coal floor. This paper takes the karst water of the Taiyuan Formation in the lower part of the A-group coal seam of the Xieqiao-Zhangji-Gubei three mines in the Panxie mining area as the research object, and multivariate statistics, hydrochemical analysis were combined with hydrogeochemical simulation. The hydrogeochemical Component characteristics and cause of formation of the karst water-bearing system covered by huge thick unconsolidated layer are discussed. The results show that the cations are dominated by Na+ + K+, and the anions are mainly Cl and HCO3 in the karst water in Taiyuan Formation in the study area, mainly affected by the dissolution of salt rock and the oxidation of pyrite, there are cations exchange and adsorption and desulfurization.
Content Characteristics of Rare Earth Elements in Stone Coal and Parting in Southern Shaanxi, China  [PDF]
Weiguo Zhang, Jianye Yang, Yuan Shi, Tingting Lv, Mengmeng Fan
International Journal of Clean Coal and Energy (IJCCE) , 2019, DOI: 10.4236/ijcce.2019.81001
Abstract: Stone coal is a special resource, because it is associated with a variety of rare metal elements. The elemental geochemical characteristics of stone coal can provide useful information for the study of its formation and evolution history. The content of rare earth elements in stone coal has been the focus of attention. Stone coal is widely distributed in southern Shaanxi province of China. In order to study the content and distribution of rare earth elements in stone coal, and provide a plan for the comprehensive development and utilization of stone coal, this study tested the rare earth elements content of stone coal, parting and coal ash samples, respectively, compared the content of rare earth elements in stone coal, parting, coal ash with the mean value of China coal, the mean value of world coal and the abundance value of upper crust, and discussed the features of rare earth elements content in different types of samples in southern Shaanxi province of China. The average contents of rare earth elements in the samples of stone coal, parting and coal ash were calculated, and the enrichment coefficients of the samples with the mean value of China coal, the mean value of world coal and the abundance value of upper crust were listed. The distribution rules and characteristics of the contents of rare earth elements in different types of samples in southern Shaanxi province of China were summarized.
Distinct RGK GTPases Differentially Use α1- and Auxiliary β-Binding-Dependent Mechanisms to Inhibit CaV1.2/CaV2.2 Channels
Tingting Yang, Akil Puckerin, Henry M. Colecraft
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0037079
Abstract: CaV1/CaV2 channels, comprised of pore-forming α1 and auxiliary (β,α2δ) subunits, control diverse biological responses in excitable cells. Molecules blocking CaV1/CaV2 channel currents (ICa) profoundly regulate physiology and have many therapeutic applications. Rad/Rem/Rem2/Gem GTPases (RGKs) strongly inhibit CaV1/CaV2 channels. Understanding how RGKs block ICa is critical for insights into their physiological function, and may provide design principles for developing novel CaV1/CaV2 channel inhibitors. The RGK binding sites within CaV1/CaV2 channel complexes responsible for ICa inhibition are ambiguous, and it is unclear whether there are mechanistic differences among distinct RGKs. All RGKs bind β subunits, but it is unknown if and how this interaction contributes to ICa inhibition. We investigated the role of RGK/β interaction in Rem inhibition of recombinant CaV1.2 channels, using a mutated β (β2aTM) selectively lacking RGK binding. Rem blocked β2aTM-reconstituted channels (74% inhibition) less potently than channels containing wild-type β2a (96% inhibition), suggesting the prevalence of both β-binding-dependent and independent modes of inhibition. Two mechanistic signatures of Rem inhibition of CaV1.2 channels (decreased channel surface density and open probability), but not a third (reduced maximal gating charge), depended on Rem binding to β. We identified a novel Rem binding site in CaV1.2 α1C N-terminus that mediated β-binding-independent inhibition. The CaV2.2 α1B subunit lacks the Rem binding site in the N-terminus and displays a solely β-binding-dependent form of channel inhibition. Finally, we discovered an unexpected functional dichotomy amongst distinct RGKs— while Rem and Rad use both β-binding-dependent and independent mechanisms, Gem and Rem2 use only a β-binding-dependent method to inhibit CaV1.2 channels. The results provide new mechanistic perspectives, and reveal unexpected variations in determinants, underlying inhibition of CaV1.2/CaV2.2 channels by distinct RGK GTPases.
A Pilot Study on the Development of the Experienced Rural Tourism in Shijiazhuang of China
Zhiguo Zhang,Tingting Yang,Wenjie Gao
Journal of Geography and Geology , 2009, DOI: 10.5539/jgg.v1n1p31
Abstract: Based on the feasibility analysis that China develops the experienced rural tourism, we analyzed the tourism resources around Shijiazhuang in this article, and divided the tourism sites around Shijiazhuang into five types. We pointed out the advantages and limited factors that Shijiazhuang developed the experienced rural tourism and respectively put forward different development advices combining with various types. We put forward the new opinion developing the experienced rural tourism to promote the new countryside building, and advised taking the development of rural tourism as the change to build the new socialist countryside.
Inventory Control Involving Unknown Demand of Discrete Nonperishable Items - Analysis of a Newsvendor-based Policy
Michael N. Katehakis,Jian Yang,Tingting Zhou
Statistics , 2015,
Abstract: Inventory control with unknown demand distribution is considered, with emphasis placed on the case involving discrete nonperishable items. We focus on an adaptive policy which in every period uses, as much as possible, the optimal newsvendor ordering quantity for the empirical distribution learned up to that period. The policy is assessed using the regret criterion, which measures the price paid for ambiguity on demand distribution over $T$ periods. When there are guarantees on the latter's separation from the critical newsvendor parameter $\beta=b/(h+b)$, a constant upper bound on regret can be found. Without any prior information on the demand distribution, we show that the regret does not grow faster than the rate $T^{1/2+\epsilon}$ for any $\epsilon>0$. In view of a known lower bound, this is almost the best one could hope for. Simulation studies involving this along with other policies are also conducted.
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