The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Application of DC resistive superconducting fault current limiters (SFCLs) in HVDC systems can strongly reduce the short-circuit currents. The objective of this paper is to obtain current limiting ratio and current distribution ratio of a DC resistive SFCL. Results of experiments show that the current limiting ratio of superconductor is nearly flat while the perspective current amplitudes increase...
In superconducting power apparatus, electric insulation is one of the most important deciding factors on their performance. There has been investigations about bubble generation and insulation strength in SFCLs. However, the relationship between short circuit current and heat generation is not sufficiently investigated. The objective of this paper is to investigate the influence of short circuit current...
Caching popular contents at the edge of cellular networks has been proposed to reduce the load, and hence the cost of backhaul links. It is significant to decide which files should be cached and where to cache them. In this paper, we propose a distributed caching scheme considering the tradeoff between the diversity and redundancy of base stations' cached contents. Whether it is better to cache the...
Gaussian frequency shift keying (GFSK) is widely used in low power and low cost communication. This paper proposes a novel data-aided symmetry correlation symbol synchronization algorithm (DSCSSA) using the symmetry property of the received signals in zero-IF GFSK demodulator. Compared with conventional schemes, the proposed symbol synchronization circuits based on DSCSSA are just composed of shift...
Auto-reclosing time and the success rate of the single-phase auto-reclosing operation are decided in the extinguishing time of the secondary arc. The extinction characteristic of the secondary arc is the key to guarantee the success of the auto-reclosing operating. At present, the only effective way to achieve the extinction characteristic of secondary arc in UHV transmission lines is often to have...
In Gas Insulated Switchgear (GIS) the loop resistance is a key parameter which can characterize the contact condition of the conductive circuit. The current method to measure loop resistance was mostly proposed and used in routine test, commissioning test and overhaul. The monitoring of abnormal conditions of contacts in operation has not been realized yet. To early detect the hidden contact defects...
This paper describes a design of network structure which combines Wireless Local Area Network (LAN) and Wireless Sensor Network (WSN). The network topology is employed in an enterprise scenario. At hardware side, we have designed a slim Access Point (AP) with embedded OpenWRT Linux System and a ZigBee Dongle and integrated them in a Plug and Play (PnP) manner. The ZigBee dongle has a programmer-friendly...
Device-to-device (D2D) communications allow direct transmissions between two proximate user equipments (UEs), which can improve local services in cellular networks. Considering full-duplex (FD) relaying can achieve higher spectrum and energy efficiency than half-duplex (HD) relaying, we propose a new D2D communication scheme that allows D2D links to underlay cellular downlink by assigning D2D transmitters...
Resistance type superconducting fault current limiter (SFCL) is a promising current limiter. It needs to fulfill the requirement of O-CO-CO duty in power system. So quench recovery time of YBCO superconducting tapes is very important. When superconducting tape is used in SFCL, insulation supporter should be used to support superconducting tapes and insulate it. There are many researches on quench...
In Mobile Social Networks (MSN), users can subscribe to online services and receive service data through base stations in addition to exchanging data directly. When multiple users in the same cell subscribe to the same service, the base station needs to forward the service data to all these users individually, leading to low utilization of the wireless resource. In order to improve the bandwidth efficiency,...
The continuous enlargement of fault current has a significant influence on the stability and safety of power system. A resistive superconducting fault current limiter was investigated to be an effective way to solve the problem in the former work. In this structure, short circuit current will be transferred to parallel reactor side after superconducting coil quenches. Besides, a vacuum interrupter...
The rising rate of short-circuit current in some DC systems is very high, using superconductor in DC systems can limit the fault current quickly far before the peak value of the fault current comes. However, superconductor may be destroyed by high current or long duration current. The objective of this paper is to illustrate impacts of high current on superconductor and long duration current withstanding...
Molecular communication (MC) is a promising bio-inspired communication method in future nano-networks. Diffusion-based channel is the most basic yet active branch of the MC. This paper introduces a new bio-phenomenon into MC, namely, blood capillary. While most work on diffusion-based channel focus on molecules concentration and described by Fick's law, this paper proposes to use Langevin equation...
Device-to-device (D2D) communications allow direct transmissions between two proximate user equipments (UEs) under the control of base stations (BSs), which can improve local services and spectrum efficiency in cellular networks. In this paper, we propose an efficient resource allocation scheme and a low complexity relay selection strategy for D2D communications enabled cellular networks, where a...
There are various kinds of HVDC circuit breakers (CBs) so far, however, their current interrupting capability is limited. Therefore, A DC circuit breaker (DCCB) based on superconducting current-limiting technology and self-excited oscillation technology is proposed to enhance the current interrupting capability. The proposed DCCB has two modules in series, which are superconducting current-limiting...
In this paper the interaction between several users with an energy provider is considered. The users are equipped with smart meters, and also smart meters are connected to the energy consumption controller unit. In this case a smart power infrastructure is formed that connects the users to the energy provider. This paper proposes a real time pricing algorithm based on income maximization for the future...
Sub-GHz gets more attention in the past few years due to unlicensed ubiquitous access in less-interfered frequency band and longer diffraction distance than 2.4 GHz utilized by Zigbee and Wifi. This paper presents the design and implementation of MAC and PHY of a wireless transmission protocol based on Sub-GHz called Micro-Power Wireless Data Transmission Protocol (MPWDTP) with software defined radio...
The multi-tier architecture is prevalently adopted by cloud applications, such as the three-tier web application. It is highly desirable for both tenants and providers to provide virtual networks in an efficient and elastic way, where tenant applications can automatically scale in or out with varying workloads and providers can accommodate as many requests as possible in the underlying network. However,...
Since wireless network virtualization (WNV) enables physical resources abstraction and sharing, the overall resources inefficiency can be reduced dramatically. This paper investigates a pricing-based energy efficient (EE) optimization problem for orthogonal frequency-division multiple Access (OFDMA) WNV. A typical WNV environment consists of an infrastructure provider (InP), virtual network operators...
One of the main purposes for heterogeneous wireless networks is to promote the network energy efficiency. Cell Range Expansion (CRE), as a promising solution to offload macro BS traffic and improve the network capacity, will help to improve the network energy efficiency. Users that offloaded to micro Base Stations (BSs) will always have much lower downlink (DL) signal-to-interference-and-noise ratio...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.