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Enclosure circulation of Gas Insulated Switchgear (GIS) and Very Fast Transient Overvoltage (VFTO) are harmful to many respects of power system, including system's security, stability and economic. The effective inhibition of GIS enclosure circulation and VFTO has attracted wide attention. In this paper, GIS enclosure circulation and transient ground potential has been modeled and analyzed. Firstly,...
There are two typical types of sampling mode in the geolocation of satellite interference: ultra-wideband sampling and narrowband sampling. Besides the measurement error, in narrowband case, the process of ephemeris correction will introduce considerable approximation error and crystal drift error in down convertor (DC), due to both the time-varying feature of ephemeris and non-synchronous sampling...
LTE-PON hybrid access architecture for Power Distribution Communication Network (PDCN) allows a good trade-off among cost, flexibility, and reliability. In this paper, we focus on the case where LTE-based wireless power private network already deployed in PDCN and Aggregation Points (APs), which forward data between client terminals and the control center, can be served by either LTE network or PON...
At present, the energy consumption of wireless communication network accounts for the vast majority of the operator's expenses. A cooperative energy saving mechanism is proposed in the framework of the self-organized network, based on the hybrid energy supplied, aiming at the energy consumption of cellular is too large and the utilization rate of green energy is low. According to the framework, the...
Due to the lack of spectrum resource of power wireless private network, it is difficult to guarantee the transmission for the services in the distribution network. In order to enhance the network resource utilization, this paper puts forward a method for the uplink resource scheduling of power wireless private network based on NB-IoT and LTE hybrid transmission. Firstly, through the cognizing for...
Mechanical properties at nanoscale are crucial fators in the applications such as nanoscale interconnects and active components in electronic, optoelectronic, and electromechanical devices. Determination of the hardness of nanostructures, especially nano-thin-film, with regime from several to hundreds nanometers is a challenge. In this study, we proposed an ultrasonic vibration (USV)-assisted atomic...
Device to Device (D2D) multicast communication is an effective method for local transmission. In this paper, a joint power and resource allocations scheme is proposed to maximize the number of accessed D2D groups while minimizing the total terminal transmission power for D2D underlay multicast communication. Since the derived optimization is a mixed integer nonlinear programming problem with high...
LTE-based Public Safety Network (PSN) is a wireless communication network which can provide efficient and reliable communication in disasters or emergencies for disaster relief and public protection. Therefore, ensuring that network congestion will not happen in PSN during an emergency is becoming increasingly important. LTE-based PSN is easy to be congested because part of spectrum resources is compressed...
This paper proposes a novel Gain-Aware Uplink-Downlink(GAUD) jointly resource allocation scheme to maximize the Device-to-Device(D2D) throughput while guaranteeing Quality of Service (QoS) of cellular users. We formulate the global optimization problem as a mixed integer nonlinear programming problem and decompose it into three sub-problems. Firstly, a method of jointly uplink and downlink reuse mode...
The high profile of the space-fed antennas is the main restriction for practical applications. Traditional design method to pursue high compactness of this kind of antenna is to decrease the focus-to-diameter ratio (F/D), but suffers from performance degradation. To address this issue, a small dipole array is chosen as the feed in our design. By employing conjugate field matching (CFM) technology,...
This paper proposes a risk assessment model of key service and optimization methods to reduce service risk in smart grid communication network. Firstly, we analyze the probability of failure of communication link and node which is induced by external factors, like natural disaster, human attack and system disturbances. Then using importance of services, links and nodes, we build the risk model of...
Recently, densified small cell deployment with overlay coverage through Heterogeneous Networks (HetNets) has emerged as a viable solution for 5G mobile networks. Cell Outage Detection (COD) which is the essential functionality in Self-Organizing Network (SON) is designed to autonomously deal with unexpected faults. Typical methods for detecting cell outage are usually based on Manual Drive Tests (MDT)...
Vulnerability assessment and optimization for wide area monitoring, protection and control system (WAMPAC) can enhance the robustness and sustainability of network. However, current assessment methods are incomplete and optimization methods ignore dynamic process. A comprehensive vulnerability assessment and optimization method is proposed. Firstly, for assessment, a comprehensive vulnerability indicator...
The video segmentation is the basis of video analysis and digging, the results directly affect the accuracy of follow-up processing. For the video segmentation, the predecessors have done a IoT of research. We have achieved very good results in regard to the mutant lens, but there is no good way for the gradient. Because football is a popular sports, it has a very practical significance for the process...
As an ideal candidate for biology information detection, flexible resistance-array-type sensors have attracted extensive attention. But owing to the Neighbor Disturbance in resistance array, the accuracy of the sensors has been limited greatly. In the presented work, a novel resistance measuring circuit has been developed with equipotential shielding method, which shows a better accuracy in detecting...
In designing acoustic detection systems for stored grain state, acoustic attenuation coefficient of stored grain, that is, the amount of attenuation of sound waves due to scattering and absorption in the propagation path per unit length is a crucial knowledge. When the sound source emits a single tone signal, it comes down to the problem of the amplitude estimation of a sinusoidal signal. A measurement...
A wideband mechanical beam steering lens antenna was proposed in this paper. Referring to the operating principle of Risley beam steering system, a fixed beam array antenna was utilized to excite the dielectric wedge lens at Ku-band. By controlling the relative rotation between the feed and the lens, the whole antenna system can scan to ±50° in all directions. The whole profile was integrated to minimum...
Reflectarrays and transmitarrays are extremely important in the applications of terahertz (THz) technologies, as they feature merits like high gain and low cost. In this work, a reflectarray and a transmitarray are designed at 300GHz. A 32 × 50 offset-fed wideband reflectarray antenna, based on single-layer elements with a large and linear phase response, shows a fixed beam direction without frequency...
In this work, large crystal atomic layer PtSe2 with a narrow band gap is synthesized by chemical transfer method. We then demonstrated, for the first time, mid-infrared photodetectors based on bilayer PtSe2 with fast response time and high responsivity up to 4.5 A/W under mid-infrared illumination (10 μm) at room temperature.
Metal-insulator-semiconductor structures has widely adopted in plasmonics lasers. However, we found that the insulator is not necessary if permittivity combination of laser structures is properly designed. Single-mode laser operation was demonstrate in devices without artificial insulator layers. Moreover, the operation temperature can achieve to 353 K.
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