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Collecting labeling information of time-to-event analysis is naturally very time consuming, i.e., one has to wait for the occurrence of the event of interest, which may not always be observed for every instance. By taking advantage of censored instances, survival analysis methods internally consider more samples than standard regression methods, which partially alleviates this data insufficiency problem...
Sensor based algorithms need to extract features from raw sensor data. However, different devices have different sensor data distributions. This distribution differences lead to a problem that model trained on device A may be invalid when applied to device B. However, it is labor-consuming to collect data and label them on device B from scratch. To solve the problem, a solution is proposed to learn...
For the excellent electrical performance, Gallium Nitride (GaN) new-type semiconductor devices are preferred in high voltage, high frequency and high power applications. However, GaN devices have low on-resistance and the loop layout requires low damping in high frequency loop. These both can lead to voltage and current oscillations under high frequency and even cause uncontrollable oscillations,...
In the research of lightning protection in UHV substation, overvoltage will cause serious damage to the substation when the transmission line enters the lightning strikes. In this paper, combined with substation electrical main wiring, the UHV lightning transient characteristics of the module are considered. Then in the ATP-EMTP simulation environment, the GIS transient model of the key equipments...
In recent years, online video has become more popular on the Internet with mobile terminal video traffic contributing 82% of cellular traffic. Users' sense of satisfaction with the network video business is usually measured by the indicator called “quality of experience”. Now HTTP adaptive streaming has become major method to deliver video traffic. However, TCP which is underlay protocol of HTTP is...
Step change is a key factor affecting the user trajectory and distance, to determine the trajectory of the user is a common indoor positioning method based on inertial navigation line calculation model, the prediction step is mainly based on the linear sensor, acceleration sensor data and the movement of the periodic estimation of pedestrians every step of the displacement distance. In order to improve...
In web-based scenarios, new users and new items frequently join the recommendation system over time without prior events. In addition, users always hold dynamic and diversified preferences. Therefore, cold-start and diversity are two serious challenges of the recommendation system. Recent works show that these problems can be effectively solved by contextual multi-armed bandit (CMAB) algorithms which...
Its obviously that OpenStack provides the biggest Cloud Computing platform. However the virtualization network service of Neutron, one module of OpenStack for network management, it can only realize simple management of networking, and Neutron which is based on SDN spirit also has defects in complexity of operation, more or less the uncontrollability of Neutron flows. The SDN paradigm is a perfect...
A curve fitting method based on automatically extracting subsection points is proposed to fit the wheel tread profile accurately. Firstly, the subsection points are determined by segmenting discrete points of wheel tread profile based on given errors and threshold. Secondly, the segmentation interval is determined with the respective segment point as the center, and the least squares curve fitting...
Currently, the contradiction between the rapid growth of network traffic and the limited network resource is plaguing network operators and Internet users. In this paper, we conduct a survey on how to build efficient streaming systems in edge network under SDN (software defined networking) architecture and on how to manage the large traffic in core network caused by file transferring and media streaming...
Urban function zoning is of great importance for urban structure optimization, urban resource allocation, and urban development planning. Since citizens usually act as a network of motion sensors of the city, their activities could reflect the environment around them. We considered taking advantage of VGI data to classify urban function zones. In this paper, we proposed a framework for automated urban...
Due to the lack of criterion on the efficiency of UHF RFID systems in dense environment, this paper shows a novel test method for UHF EPC C1 G2 RFID readers in a dense environment. A new parameter based on identification rate that describes the performance of readers working in dense environment is demonstrated and a new test method to generate this parameter is given. Experiment show that this test...
Spare parts are indispensable resources to ensure equipment the normal operation and continuous production, especially for urban raü vehicles. When the spare parts storage is insufficient, the equipment can't be replaced or repair ed in time, which can cause serious loss. Therefore, it is important to forecast the demand of the urban rail vehicle spare parts. A combination forecasting method based...
OpenFlow has been applied to a variety of demands of the transmission quality of the Internet business and it is still growing on its way. To test this protocol with its evolution consideration, we analyzed the working process of OpenFlow protocol and constructed the CPN model through phasing firstly and then role division for version 1.0. In addition, the selection of tokens and their given values...
A general approach for in-line filters that contain a set of frequency-variant couplings is presented in this work. By utilizing an absolute matrix transformation process, the synthesis is distinctive from all other similar literatures because no optimization is required. In result, it is shown that multiple transmission zeros can be individually generated by the frequency-variant couplings. Moreover,...
In this paper, microstrip bandpass filters using fragment-type coupling structure based on multi-objective optimization are proposed for the first time. The fragment-type coupling structure allows the design of bandpass filters with improved characteristics. In particular, it can implement filters with desirable upper stopband performance and reduced occupation area. The design of fragment-type coupling...
The frequency diverse multiple-input multiple-output (FD-MIMO) sonar can use a group of small-bandwidth FD pulses to synthesize a large bandwidth signal, which brings a higher range resolution than traditional methods. However the range sidelobe level (SLL) is high due to the cross-correlation function (CCF) interferences and the spectrum leakage between auto-correlation functions (ACFs) of transmitting...
In recent years, using multiple arrays instead of a single array has raised great interest in various applications. In this paper, we consider a distributed signal detection problem using an underwater multi-array system. Beamforming is first performed at each hydrophone array to increase local array output signal-to-noise ratio (SNR). Then these arrays are viewed as “virtual” sensor nodes in an underwater...
Currently, blended learning has become an innovative learning model, which can improve learners' learning effect, expand learners' learning opportunities, enhance interaction between teachers and students, and support learners' self-regulated. The key to develop an effective blended learning is to provide learning support service. The paper advocates that the blended learning mainly needs the support...
The increasing integration of Electric vehicles (EVs) and renewable generators (RGs) is an inevitable trend in power system development to control the release of greenhouse gases and pollution and reduce dependence on fossil fuels. This will challenge distribution networks, which have constrained capacities, due to the intrinsic intermittence of renewable power and additional charging load demand...
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