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Various electromagnetic (EM) structures become more complex and often have increasing degrees of design freedom. Classical optimization methods require numerous simulation trials of different parameter combinations, which leads to a low design efficiency. To address this problem, an efficient EM structure optimization algorithm which combines differential evolution (DE) with machine learning technology...
Massive MIMO has been regarded as one of the most promising technologies for the 5G system, where precoding schemes have large potential to improve the network efficiency. However, substantial antennas deployment in massive MIMO systems make the generalized precoding schemes too complex to implement, while two-stage precoding strategies embrace flexible antenna structure and reduce both hardware complexity...
In the era of the Big Data, cache is regarded as one of the most effective technique to improve the performance of accessing data. The majority of caches save each query result as a file, thus it is difficult to reuse the data from parts of some query results in the cache, and consequently some cached data were wasted. Through studying domestic and foreign related technologies, this paper designs...
With the development and evolution of the LTE system, the operators are experiencing huge challenges on operations and service maintenance, which sets off a wave of SON (Self-organizing Network) research. As one of the crucial component of SON, the cell outage detection is an effective way to automatically detect outage cells resulted from hardware or software problems. Our work in this paper aims...
Computer aided programming techniques do not only lead to breakthrough in data management, but also changes the method in realizing sustainability in smart homes. Smart technologies improve the solar energy collection and reduce water wastage in fire protection system tests. It helps us achieve the goal of win-win-win environment, social and economics, i.e. sustainable development in our society.
This article examines the impact of European sovereign debt crisis on China's real estate market with the software EView. It begins with an analysis on the causes of the Euro zone crisis. A multivariate regression analysis is used to determine the effect of the European sovereign debt crisis on China's real estate market. By using the Thomson Reuters' database and other databases, investment and the...
In order to suit high mobility and limited resources of ad hoc networks, a new hybrid routing strategy named Non-Source Non-Certain Routing (NSNCR) is proposed. This paper designs a multi-path judgment method for handling request message in route discovery process. A next hop selecting mechanism used for forwarding packets is proposed, and the mechanism is based on series of collective concepts like...
With the ability to provide on-demand service and to reduce the IT cost, cloud computing becomes more and more popular recently. Virtualization is one of the important technologies in cloud computing, whose main idea is to provide abstractions of the physical resources. However, such abstraction can cause performance degradation, especially for I/O virtualization, which is usually the performance...
This paper puts forward hybrid and hierarchical resource locating model based on Chord (HHRLMC),this model is divided into two layers, the upper layer consisted Super-Peers constructs resource location based on Chord[1] ring, the lower layer adopts centralized scheme with the Super-Peers for center and Pure-Peer for edge. In the process of searching resource, the system can comprehensively use resource...
Load balance is a key technology in future heterogeneous wireless networks due to its merits like improving resource utilization, enlarging system capacity and providing QoS for users. This paper presents a load balancing scheme which is composed of QoS-based and load-related admission control and dynamic vertical handover. The scheme can provide better QoS and jointly optimize resource utilization...
Lithium batteries are commonly used in mobile phones, personal digital assistants (PDA), notebooks and other computer, communication and consumer electronics (3C) products. Lithium batteries in 3C products or electric vehicles must rapidly charge and discharge. Thus, the inner temperature increases rapidly, which is a safety issue. Conversely, over charging results in unstable voltage and current...
Modern underground space planning knowledge sharing no longer depends on face-to-face meetings, lectures or phone calls only. The conventional read-only Web 1.0 was designed by HTML helps us in knowing about the World wide underground space planning. Nevertheless, during the era of Web 1.0, online users can only read but cannot add anything new or express their ideas. The current change to Web 2.0...
A simplified 3D gaze tracking technology with stereo vision has been developed in this paper. A pair of stereo cameras and two point light sources are used to estimate 3D gaze of user's eye. Compared with other 3D systems, there are two improvements to simplify the whole system in this paper: First, 3D gaze is estimated as the line linking 3D cornea center and the virtual image of pupil center using...
As domestic service industry rises, research of supporting system for service industry is getting increasingly important. This paper proposed the management approach of service quality of Value Chain service interface and hierarchy supporting interface with reference to NGOSS as verification, the main function specification, general scenario and architecture of the corresponding IT system were proposed.
As the existence of diverse network technologies, QoS signaling is needed to guarantee the end-to-end QoS for users in complex network environment. Compared with the previous QoS signaling with resource reservation, NSIS (next steps in signaling) proposed by IETF is better in flexibility and scalability. This paper proposes a new mobility-aware scheme for QoS NSLP (NSIS signaling layer protocol) in...
As integration of heterogeneous networks has become one of the most important characters for next-generation networks, it becomes a very challenging issue to ensure effective handoff when mobile node moves between different heterogeneous networks. In this paper we propose an effective handoff mechanism based on location information. By processing geographical data (consisting of information about...
It is necessary to provide seamless multimedia services to mobile users. However, due to the effects of host mobility, it is difficult to achieve seamless QoS guarantee. Several solutions have been proposed to couple QoS with mobility management. In this paper, a QoS-aware HMIPv6 solution using QoS NSLP is proposed. The cross-layer solution takes use of L2 and L3 triggers to execute the resource reservation...
Multi-radio access selection (MRAS) is a key issue to obtain performance improvement in heterogeneous wireless networks. MRAS can affect the users' QoS directly, as well as the resource allocation and load balance for networks. In this paper, a universal MRAS decision model was set up by multi-objective optimization methods. Parameters from upper layer and lower layer related with network selection...
In this paper, we consider an OFDMA-based two-hop relay network which consists of a single base station, dedicated fixed relay stations and subscriber stations. We investigate the optimal location of the relay stations aiming to maximize system throughput. We also focus on the impact of different relay strategies (i.e., decode-and-forward vs. amplify-and-forward) for each source-destination pair on...
In order to avoid the problem caused by single point of failure of the root AAA (authentication, authorization, and accounting) server in hierarchical AAA mobility management (HAMM), a novel robust fault tolerant scheme for hierarchical AAA (RFT-HA) is proposed in Mobile IPv6. In this scheme, the period of detecting the root AAA server's (RAAAS) failure is decreased by adopting ICMPv6 and Diameter...
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