Synergetic optimization operation method for distribution network based on SOP and PV

The integration of distributed generation brings in new challenges for the operation of distribution networks,including out-of-limit voltage and power flow control.Soft open points(SOP)are new power electronic devices that can flexibly control active and reactive power flows.With the exception of active power output,photovoltaic(PV)devices can provide reactive power compensation through an inverter.Thus,a synergetic optimization operation method for SOP and PV in a distribution network is proposed.A synergetic optimization model was developed.The voltage deviation,network loss,and ratio of photovoltaic abandonment were selected as the objective functions.The PV model was improved by considering the three reactive power output modes of the PV inverter.Both the load fluctuation and loss of the SOP were considered.Three multi-objective optimization algorithms were used,and a compromise optimal solution was calculated.Case studies were conducted using an IEEE 33-node system.The simulation results indicated that the SOP and PVs complemented each other in terms of active power transmission and reactive power compensation.Synergetic optimization improves power control capability and flexibility,providing better power quality and PV consumption rate.

Development of a DFN-based probabilistic block theory approach for bench face angle design in open pit mining

In open pit mining,uncontrolled block instabilities have serious social,economic and regulatory consequences,such as casualties,disruption of operation and increased regulation difficulties.For this reason,bench face angle,as one of the controlling parameters associated with block instabilities,should be carefully designed for sustainable mining.This study introduces a discrete fracture network(DFN)-based probabilistic block theory approach for the fast design of the bench face angle.A major advantage is the explicit incorporation of discontinuity size and spatial distribution in the procedure of key blocks testing.The proposed approach was applied to a granite mine in China.First,DFN models were generated from a multi-step modeling procedure to simulate the complex structural characteristics of pit slopes.Then,a modified key blocks searching method was applied to the slope faces modeled,and a cumulative probability of failure was obtained for each sector.Finally,a bench face angle was determined commensurate with an acceptable risk level of stability.The simulation results have shown that the number of hazardous traces exposed on the slope face can be significantly reduced when the suggested bench face angle is adopted,indicating an extremely low risk of uncontrolled block instabilities.

低空智联网中基于多质心OpenMax的无人机开集识别方法

随着网络化、智能化的发展,无人机(Unmanned aerial vehicles, UAVs)逐渐成为低空智联网(Low-altitude intelligent network, LAIN)的重要组成部分,但如何对低空智联网中的无人机平台进行有效的管理仍面临严峻挑战。基于无人机信号中的细微特征可对无人机进行个体识别,并检测是否为非法无人机,从而实现低空智联网中无人机的身份识别和管理。针对低空领域信道环境复杂且无法提前获取非法无人机信号样本的问题,本文提出了基于差值时频和多质心OpenMax的无人机开集识别方法。首先,提出了与信道无关的差值时频特征来降低多径信道环境对射频指纹(Radio frequency fingerprinting, RFF)特征的影响,并利用数据增强提高了识别模型的准确率和鲁棒性。其次,利用多质心OpenMax替代神经网络Softmax层,以实现无人机个体的开集识别。最后,对神经网络的损失函数进行了改进,提高了开集识别准确率。本文利用真实环境采集的数据对所提算法进行了验证,在多径信道环境中开放度为0.087时,开集识别准确率达到了93.23%,与基准算法相比,准确率分别提高了7.61%和13.4%。本文提出的算法可在复杂信道环境中有效识别无人机个体并检测出首次出现的非法无人机。

Decoupled Delay and Bandwidth Centralized Queue-Based QoS Scheme in OpenFlow Networks

There are an increasing of scenarios that require the independent bandwidth and delay demands. For instance, in a data center, the interactive message would not occupy much bandwidth, but it requires the rigorous demands for the delay. However, the existing QoS approaches are mainly bandwidth based, which are inappropriate for these scenarios. Hence, we propose the decoupled scheme in the OpenFlow networks to provide the centralized differential bandwidth and delay control. We leverage the mature HTB to manage the bandwidth. And we design the Queue Delay Management Scheme (QDMS) for queuing delay arrangement, as well as the Comprehensive Parameters based Dijkstra Route algorithm (CPDR) for the propagation delay control. The evaluation results verify the decoupling effectiveness. And the decoupled scheme can reduce the delay for high priority flows.

Open Queueing Network Model of Shanghai Public Transportation Problem

In this paper, the open queueing network model is proposed for solving the problem of public transportation in cities. The vertices of the networks(i.e., the bus stops) are determined by means of the fuzzy clustering method. The arcs (i.e., the paths of the public transportation) can be set up by using the shortest path model in the time sense or the 0 1 integer programming method.Applying the statistics method, we can calculate the parameters(such as the passenger flow's distribution, passenger flow's transition probability, mean waiting time for the bus etc. ) of the public transportation network. In this paper, we suggest to divide the network into two or three stages to implement the public transportation system in the form of ``frog jumping' fast transfer and ``permeation' fast dispersion.Combining the computer simulation and the evaluation of the achievement and effect of public transportation system, we modify the model so as to solve the public transportation problem better.

Open World Recognition of Communication Jamming Signals

To improve the recognition ability of communication jamming signals,Siamese Neural Network-based Open World Recognition(SNNOWR)is proposed.The algorithm can recognize known jamming classes,detect new(unknown)jamming classes,and unsupervised cluseter new classes.The network of SNN-OWR is trained supervised with paired input data consisting of two samples from a known dataset.On the one hand,the network is required to have the ability to distinguish whether two samples are from the same class.On the other hand,the latent distribution of known class is forced to approach their own unique Gaussian distribution,which is prepared for the subsequent open set testing.During the test,the unknown class detection process based on Gaussian probability density function threshold is designed,and an unsupervised clustering algorithm of the unknown jamming is realized by using the prior knowledge of known classes.The simulation results show that when the jamming-to-noise ratio is more than 0d B,the accuracy of SNN-OWR algorithm for known jamming classes recognition,unknown jamming detection and unsupervised clustering of unknown jamming is about 95%.This indicates that the SNN-OWR algorithm can make the effect of the recognition of unknown jamming be almost the same as that of known jamming.

Multi-source coordinated stochastic restoration for SOP in distribution networks with a two-stage algorithm

After suffering from a grid blackout, distributed energy resources(DERs), such as local renewable energy and controllable distributed generators and energy storage can be used to restore loads enhancing the system’s resilience. In this study, a multi-source coordinated load restoration strategy was investigated for a distribution network with soft open points(SOPs). Here, the flexible regulation ability of the SOPs is fully utilized to improve the load restoration level while mitigating voltage deviations. Owing to the uncertainty, a scenario-based stochastic optimization approach was employed,and the load restoration problem was formulated as a mixed-integer nonlinear programming model. A computationally efficient solution algorithm was developed for the model using convex relaxation and linearization methods. The algorithm is organized into a two-stage structure, in which the energy storage system is dispatched in the first stage by solving a relaxed convex problem. In the second stage, an integer programming problem is calculated to acquire the outputs of both SOPs and power resources. A numerical test was conducted on both IEEE 33-bus and IEEE 123-bus systems to validate the effectiveness of the proposed strategy.

GPP Based Open Cellular Network Towards 5G

Due to 5G's stringent and uncertainty traffic requirements,open ecosystem would be one inevitable way to develop 5G.On the other hand,GPP based mobile communication becomes appealing recently attributed to its striking advantage in flexibility and re-configurability.In this paper,both the advantages and challenges of GPP platform are detailed analyzed.Furthermore,both GPP based software and hardware architectures for open 5G are presented and the performances of real-time signal processing and power consumption are also evaluated.The evaluation results indicate that turbo and power consumption may be another challengeable problem should be further solved to meet the requirements of realistic deployments.

A Scalable Architecture for Network Traffic Monitoring and Analysis Using Free Open Source Software

The lack of current network dynamics studies that evaluate the effects of new application and protocol deployment or long-term studies that observe the effect of incremental changes on the Internet, and the change in the overall stability of the Internet under various conditions and threats has made network monitoring challenging. A good understanding of the nature and type of network traffic is the key to solving congestion problems. In this paper we describe the architecture and implementation of a scalable network traffic moni-toring and analysis system. The gigabit interface on the monitoring system was configured to capture network traffic and the Multi Router Traffic Grapher (MRTG) and Webalizer produces graphical and detailed traffic analysis. This system is in use at the Obafemi Awolowo University, IleIfe, Nigeria;we describe how this system can be replicated in another environment.

Open Access to Geological Research of China——“Geoscience Periodical Network China”

＂Geoscience Periodical Network of China＂ is composed of 233 Chinese geological journals, which covers all kinds of geological research fields of China. All papers of this site comprise English abstract, and some papers have figures with English description. Papers present as the PDF format with two types： （1） papers can be downloaded for opening access; and （2） the others provide both Chinese and English abstract, which can be downloaded after registration. Welcome to visit our website： http：//www.geojournals.cn/

Open Access to Geological Research of China——"Geoscience Periodical Network of China"

＂Geoscience Periodical Network of China＂ is composed of 233 Chinese geological journals, which covers all kinds of geological research fields of China. All papers of this site comprise English abstract, and some papers have figures with English description. Papers present as the PDF format with two types： （1） papers can be downloaded for opening access; and （2） the others provide both Chinese and English abstract, which can be downloaded after registration. Welcome to visit our website： http：//www.geojournals.cn/

Open Access to Geological Research of China—“Geoscience Periodical Network of China”

＂Geoscience Periodical Network of China＂ is composed of 233 Chinese geological journals, which covers all kinds of geological research fields of China. All papers of this site comprise English abstract, and some papers have figures with English description. Papers present as the PDF format with two types： （1） papers can be downloaded for opening access; and （2） the others provide both Chirtese and English abstract, which can be downloaded after registration.

Open Access to Geological Research of China—"Geoscience Periodical Network of China"

＂Geoscience Periodical Network of China＂ is composed of 233 Chinese geological journals, which covers all kinds of geological research fields of China. All papers of this site comprise English abstract, and some papers have figures with English description. Papers present as the PDF format with two types： （1） papers can be downloaded for opening access; and （2） the others provide both Chinese and English abstract, which can be downloaded after registration. Welcome to visit our website： http：//www.geojournals.cn/

Open Access to Geological Research of China—"Geoscience Periodical Network of China"

＂Geoscience Periodical Network of China＂ is composed of 233 Chinese geological journals, which covers all kinds of geological research fields of China. All papers of this site comprise English abstract, and some papers have figures with English description. Papers present as the PDF format with two types： （1） papers can be downloaded for opening access;

Open Access to Geological Research of China-“Geoscience Periodical Network of China”

＂Geoscience Periodical Network of China＂ is composed of 233 Chinese geological journals, which covers all kinds of geological research fields of China. All papers of this site comprise English abstract, and some papers have figures with English description. Papers present as the PDF format with two types： （1） papers can be downloaded for opening access; and （2） the others provide both Chinese and English abstract, which can be downloaded after registration. Welcome to visit our website： http：//www.geojournals.cn/

Open Access to Geological Research of China—“Geoscience Periodical Network of China”

＂Geoscience Periodical Network of China＂ is composed of 233 Chinese geological journals, which covers all kinds of geological research fields of China. All papers of this site comprise English abstract, and some papers have figures with English description. Papers present as the PDF format with two types： （1） papers can be downloaded for opening access; and （2） the others provide both Chinese and English abstract, which can be downloaded after registration.

Open Access to Geological Research of China——"Geoscience Periodical Network of China"

＂Geoscience Periodical Network of China＂ is composed of 233 Chinese geological journals, which covers all kinds of geological research fields of China. All papers of this site comprise English abstract, and some papers have figures with English description. Papers present as the PDF format with two types： （1） papers can he downloaded for opening access; and （2） the others provide both Chinese and English abstract, which can be downloaded after registration. Welcome to visit our website： http：//www.geojournals.cn/

Open Access to Geological Research of China — "Geoscience Periodical Network of China"

＂Geoscience Periodical Network of China＂ is composed of 233 Chinese geological journals, which covers all kinds of geological research fields of China. All papers of this site comprise English abstract, and some papers have figures with English description. Papers present as the PDF format with two types： （1） papers can be downloaded for opening access; and （2） the others provide both Chinese and English abstract, which can be downloaded after registration. Welcome to visit our website： http：//www.geojournals.cn/

Open Access to Geological Research of China — "Geoscience Periodical Network of China"

Geoscience Periodical Network of China a"is s composed of 233 Chinese geological journals,which covers all kinds of geological research fi(elds of China.All papers of this site comprise English abstract,and some papers have figures with English description.Papers present as the

Open Access to Geological Research of China— "Geoscience Periodical Network of China"

＂Geoscience Periodical Network of China＂ is composed of 233 Chinese geological journals, which covers all kinds of geological research fields of China. All papers of this site comprise English abstract, and some papers have figures with English description. Papers present as the PDF format with two types： （1） papers can be downloaded for opening access; and （2） the others provide both Chinese and English abstract, which can be downloaded after registration. Welcome to visit our website： http：//www.geojournals.cn/