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Virtual network embedding (VNE), which is a significant problem in cloud computing, has gained much attention among many researchers recently. Due to the NP-hardness of VNE, the existing solvers are either inefficient or inaccurate. This paper develops a novel algorithm based on the ant colony system (ACS). To solve the VNE problem, the algorithm structure concentrates on the link mapping from virtual...
Big data processing applications have been migrated into cloud gradually, due to the advantages of cloud computing. Hadoop Distributed File System (HDFS), is one of the fundamental support systems for big data processing on MapReduce-like frameworks, such as Hadoop and Spark. However, the default block allocation scheme of HDFS doesn't fit well in the cloud environments behaving in two aspects: data...
Downlink Carrier Aggregation is a promising LTE-Advanced technology which is introduced in 3GPP LTE Release 10. Meanwhile, it introduces some challenges since more uplink control information needs to be fed backed from UE to eNB to enable the carrier aggregation. In this paper, we firstly introduce the CA feature in LTE-Advanced, and present the PUCCH format 1b with channel selection and PUCCH format...
As the most commonly techniques to landslide inventory mapping, visual interpretation and geomorphological field surveys are time-consuming and labor-intensive. In this paper, a probabilistic topic model, maximum entropy discrimination latent Dirichlet allocation (MedLDA), is presented to detect landslides with satellite images of two different spatial resolutions in a weakly supervised way. A two-stage...
Federated scheduling is a strategy to schedule parallel real-time tasks: It allocates a dedicated cluster of cores to each high-utilization task (utilization ≥ 1); It uses a multiprocessor scheduling algorithm to schedule and execute all low-utilization tasks sequentially, on a shared cluster of the remaining cores. Prior work has shown that federated scheduling has the best known capacity augmentation...
This paper considers a multi-input multi-output (MIMO) wireless relay network, where the source S communicates wirelessly to the destination D via the help of a nonregenerative relay R. Previous studies are almost exclusively based on the assumptions of equal time-duration phases for S-R and R-D transmission and equal number of multiple antennas for every node, and the results concerning arbitrary...
This paper considers a multiuser two-way relaying system with time division broadcast (TDBC) protocol, where one multiantenna base station (BS) and one out of N single-antenna mobile stations (MSs) exchange information with the aid of one single-antenna amplify-and-forward (AF) relay. We first propose an optimal joint user-antenna selection scheme, which minimizes the system outage probability. Then...
Energy efficiency (EE) is among the main considerations in the design of modern wireless networks. In this paper, we investigate the EE enhancement for asymmetric analog network coding (ANC) protocol of a two-way relay system based on statistical channel information. A power allocation problem is formulated as the system EE maximization problem with objective function quantified by Goodbit-per-Energy...
Femtocells will be widely employed in the next generation wireless networks since they improve indoor capacity and coverage with low cost and low power characteristics. However since macro cells may have to share the same spectrum with femtocells, resource allocation schemes have been a key challenge to manage interference. In this paper, we propose a novel resource allocation scheme based on cognitive...
Cloud computing service provides elastic and infinite computing resources to meet users' QoS requirements such as deadline and service cost. However, some tasks may be delayed because of the long waiting time before their resources are available. So, how to supply dynamic resource scaling and task migration is an important question which determines users' Service-level agreement(SLA) whether can be...
An over-booking based dynamic spectrum management (DSM) scheme is conceived for improving the attainable spectral efficiency. All secondary users (SU) will be categorized into different classes and they borrow spectral resource from the primary users (PU) before data transmission. Under the risk-based policy model, the effects of both booking cancellations and 'no-show' reservations are analyzed....
The realistic organizational connection structure of logistics network displays a complicated situation, and the multidimensional heterogeneity is one of most important causes. In this paper, we develop a definition of network heterogeneity in general social and economic network research according to managerial reality with a sharing coefficient. Then, we analysis the network formative mechanism based...
Based on the theory of non-convex interval goal programming and the discrete resources ideology, this paper constructs three basic storage resources allocation models, to illustrate the relationship between the aggregate requirement and the gross capability of storage in a group enterprise. Numerical results for the oil country tubular goods (OCTG) of 17 subcompanies of a group oil enterprise, verified...
This paper devises a novel group frequency-hopping (FH) scheme for OFDM modulated multiuser system, in order to optimize the resource reuse efficiency and resolve the performance degradation due to the deep fading in the same time. In the OFDM modulated multiuser system, the traditional FH schemes can work in a multipath fading environment and achieve a moderate bit-error-rate (BER). However, when...
This paper studies the relay-assisted inter-vehicular communications (IVCs) with double Rayleigh fading vehicle-to-vehicle links. The OPA (optimal power allocation) solution is derived through maximizing source-to-destination channel capacity assuming amplify-and-forward relaying. The outage performance is discussed and the lower bound on outage probability at medium to high SNR (signal-to-noise ratio)...
Based on revenue management and analysis of uncertainties of air cargo, a robust optimization model for multi-leg capacity inventory control is proposed. This model expresses uncertain parameters as ellipsoid for solving uncertain problems effectively. To deal with the pre-maturity of canonical genetic algorithm, niche genetic algorithm was adopted. Experimental results show the algorithm is effective...
A networked distributed inventory management system of logistics based on coordination center is established in this paper. The storage data consists of user information, delivery time, requirement information and the inventory of warehouse. Through the coordination center, the funds and supply ability between suppliers are dispensed to satisfy the demands of customers. The warehouse orders and allocation...
Grid resource management plays an important role while enabling the sharing and coordinating of resources in grid computing environments. Resource reservation is an important part of the grid resource management. An advance reservation is a scheduling object which reserves a group of resources for a particular timeframe for access only by a specified entity or group of entities. Combining resource...
Cooperative diversity is an emerging technique that enables single-antenna terminals to share their resources (bandwidth and power) and achieve transmit diversity in a distributed fashion. In this work, an adaptive decode-and-forward(DF) cooperative diversity system based on quadrature signaling is proposed. Then a tight closed-form approximate bit error rate(BER) expression is derived in terms of...
The design of micro-mobility management protocols stands out as an important challenge in integrating wireless networks into the IP-based Internet, especially when such networks are deployed for real-time multimedia applications. We present a new load balancing hierarchical model for micro-mobility management for the wireless access network. The scheme includes a novel anchor selection algorithm....
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