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Optimization model and algorithm for mixed traffic of urban road network with flow interference

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Science China(Technological Sciences) 2008年第12期51卷 2213-2222页

作者： SI BingFeng,LONG JianCeng & GAO ZiYou State Key Laboratory of rail Traffic Control and Safety,Beijing Jiaotong University,Beijing 100044,China State Key Laboratory of rail Traffic Control and Safety Beijing Jiaotong University Beijing China

In this paper,the problem of interferences between motors and non-motors in urban road mixed traffic network is considered and the corresponding link impedance function is presented based on travel *** the base of this,the main factors that influence travelers' traffic choices are all considered and a combined model including flow-split and assignment problem is *** a bilevel model with its algorithm for system optimization of urban road mixed traffic network is *** the application of the model and its algorithm is illus-trated with a numerical example.

关键词： mixed traffic impedance function user equilibrium optimization

Computing Power network:The Architecture of Convergence of Computing and networking towards 6G Requirement

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China Communications 2021年第2期18卷 175-185页

作者： Xiongyan Tang Chang Cao Youxiang Wang Shuai Zhang Ying Liu Mingxuan Li Tao He Future network Research Department China Unicom Network Technology Research InstituteBeijing 100048China

In 6G era,service forms in which computing power acts as the core will be ubiquitous in the *** the same time,the collaboration among edge computing,cloud computing and network is needed to support edge computing service with strong demand for computing power,so as to realize the optimization of resource *** on this,the article discusses the research background,key techniques and main application scenarios of computing power *** the demonstration,it can be concluded that the technical solution of computing power network can effectively meet the multi-level deployment and flexible scheduling needs of the future 6G business for computing,storage and network,and adapt to the integration needs of computing power and network in various scenarios,such as user oriented,government enterprise oriented,computing power open and so on.

关键词： 6G edge computing cloud computing convergence of cloud and network computing power network

Minimizing Maximum Risk for Fair network Connection with Interval Data

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Acta Mathematicae Applicatae Sinica 2010年第1期26卷 33-40页

作者： Jie Hu State Key Laboratory of rail Traffic Control and Safety Beijing Jiaotong University Beijing 100044 China

In this paper we introduce a minimax model for network connection problems with interval parameters. We consider how to connect given nodes in a network with a path or a spanning tree under a given budget, where each link is associated with an interval and can be established at a cost of any value in the interval. The quality of an individual link （or the risk of link failure, etc.） depends on its construction cost and associated interval. To achieve fairness of the network connection, our model aims at the minimization of the maximum risk over all links used. We propose two algorithms that find optimal paths and spanning trees in polynomial time, respectively. The polynomial solvability indicates salient difference between our minimax model and the model of robust deviation criterion for network connection with interval data, which gives rise to NP-hard optimization problems.

关键词： network connection interval data shortest path spanning tree minimax approach

An Improved Walk Model for Train Movement on railway network

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Communications in Theoretical Physics 2009年第6期51卷 979-984页

作者： LI Ke-Ping MAO Bo-Hua GAO Zi-You State Key Laboratory of rail Traffic Control and Safety Beijing Jiaotong University Beijing 100044 China

In this paper, we propose an improved walk model for simulating the train movement on railway network. In the proposed method, walkers represent trains. The improved walk model is a kind of the network-based simulation analysis model. Using some management rules for walker movement, walker can dynamically determine its departure and arrival times at stations. In order to test the proposed method, we simulate the train movement on a part of railway network. The numerical simulation and analytical results demonstrate that the improved model is an effective tool for simulating the train movement on railway network. Moreover, it can well capture the characteristic behaviors of train scheduling in railway traffic.

关键词： train movement random-walk model train timetable

Coalition Game Based Full-Duplex Concurrent Scheduling in Millimeter Wave Wireless Backhaul network

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China Communications 2019年第2期16卷 59-75页

作者： Haiyan Jiang Yong Niu Jiayi Zhang Bo Ai Zhangdui Zhong The State Key Laboratory of rail Traffic Control and Safety and the School of Electronic and Information EngineeringBeijing Jiaotong University

With the development of self-interference(SI) cancelation technology, full-duplex(FD) communication becomes possible. FD communication can theoretically double the spectral efficiency. When the time slot(TS) resources are limited and the number of flows is large, the scheduling mechanism of the flows becomes more important. Therefore, the effectiveness of FD scheduling mechanism for the flows is studied in millimeter wave wireless backhaul network with the limited TS resources. We proposed a full duplex concurrent scheduling algorithm based on coalition game(FDCG) to maximize the number of flows with their QoS requirements satisfied. We transformed the problem of maximizing the number of flows with their QoS requirements satisfied into the problem of maximizing sum rate of concurrently scheduled flows in each slot. We obtained the scheduled flows with maximum sum rate in first slot by using coalition *** then with certain restrictions, the maximum sum rate of concurrently scheduled flows can also be achieved in subsequent time slots. The simulation results show that the proposed FDCG algorithm canachieve superior performance in terms of the number of flows that meet their QoS requirements and system throughput compared with other three algorithms.

关键词： millimeter wave wireless backhaul network coalition game concurrent scheduling maximum sum rate

Short-term passenger flow prediction of rail transit based on VMD-LSTM neural network combination model

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Short-term passenger flow prediction of rail transit based o...

Multi-pair massive MIMO amplify-and-forward relaying system with low-resolution ADCs:performance analysis and power control

第32届中国控制与决策会议

作者： Dong Liang Jie Xu Siyao Li Chuankai Sun State Key Laboratory of rail Control and Safety Beijing Jiaotong University School of Traffic and Transportation Beijing Jiaotong University Beijing Research Center of Urban Traffic Information Sensing and Service Technologies Research and Development Center of Transport Industry of Technologies and Equipment of Urban rail Operation Safety Management MOTPRC

The short-term passenger flow of urban rail transit has obvious characteristics of non-linearity and non-stationarity,and the traditional prediction method has poor *** on this,this paper proposes a VMD-LSTM combination model for the prediction of short-term passenger flow in urban rail transit and verifies it by an *** results show that:（1） the prediction effect of the LSTM neural network is better than the RNN neural network;（2） the VMD-LSTM neural network combined model prediction is more accurate than the prediction using the LSTM neural network ***,the combined model is suitable for the prediction of short-term passenger flow in rail transit,which helps the subway company to grasp the law of passenger flow change,so as to formulate a practical traffic management plan and improve operational efficiency.

关键词： passenger flow prediction VMD decomposition LSTM neural network combined prediction model

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Science China(Information Sciences) 2018年第2期61卷 164-181页

作者： Qimei CUI Yinjun LIU Yinsheng LIU Weiliang XIE Yong ZHAO National Engineering Laboratory for Mobile network Security Beijing University of Posts and Telecommunications State Key Laboratory of rail Traffic Control and Safety Beijing Jiaotong University China Telecom Corporation Limited

In this paper, we focus on a general multi-pair massive MIMO amplify-and-forward(AF) relaying system where the relay antennas employ low-resolution analog-to-digital converters(ADCs) to reduce the hardware cost. First, considering the effect of low quantization on channel estimation, a tight closed form approximation of the system ergodic achievable rate is derived. Second, some asymptotic analysis is presented to reveal the impacts of the system parameters on the achievable rate. Particularly, the generalized power scaling schemes are characterized. The results indicate that in some cases, when the number of relay antennas grows without bound, the impact of the finite resolution ADCs on data transmission can be eliminated. To enhance the achievable rate of the quantized systems, the optimal user and relay power control schemes are proposed. Furthermore, to reap all the benefits of low-resolution ADCs, another power control scheme is also designed to minimize the total power consumption while guaranteeing the quality-of-service(Qo S)requirement of each user, which can help draw some useful insights into the optimal ADC resolution from power saving perspectives. The simulation results confirm the accuracy of our theoretical analysis and the effectiveness of the proposed power control schemes.

关键词： massive MIMO relaying system imperfect CSI low quantization power control

Synchronous hybrid transport network design

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Journal of Central South University 2009年第2期16卷 332-338页

作者：李夏苗曾明华傅白白朱晓立 School of Traffic and Transport Engineering Central South University State Key Laboratory of rail Traffic Control and Safety Beijing Jiaotong University

Delay,as an inevitable real-world phenomenon,is usually ignored in transport network design.A model of urban hybrid transport system with stochastic delay was created on the basis of the idealized public transport system *** formulating the total trip time cost composed of accessing time in the sub-region of the city,waiting time at the public transport station,and in-vehicle time in the public transit network,the analytical properties of the total trip time cost function were *** results show that in the urban hybrid transport network design,the total trip time cost reaches its approximate minimum in a δ-neighbourhood of buffer time of 1.5 min,and that through modelling optimal delay in hybrid transport system,the maximal synchronization can be achieved and operational efficiency and passenger satisfaction can be *** proposed modelling and analytical investigations are attempts to contribute to more realistic modelling of future idealized public transport system that involves more practical constraints.

关键词： transport network design delay synchronization total trip time cost

Glia-to-neuron reprogramming to the rescue?

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Neural Regeneration Research 2025年第5期20卷 1395-1396页

作者： Jack W.Hickmott Cindi M.Morshead Department of Surgery University of TorontoTorontoONCanada Donnelly Centre for Cellular and Biomolecular Research TorontoONCanada Institute of Biomedical Engineering University of TorontoTorontoONCanada The KITE Research Institute Toronto Rehabilitation InstituteUniversity Health NetworkTorontoONCanada

Over the last two decades,the dogma that cell fate is immutable has been increasingly challenged,with important implications for regenerative *** brea kth rough discovery that induced pluripotent stem cells could be generated from adult mouse fibroblasts is powerful proof that cell fate can be *** exciting extension of the discovery of cell fate impermanence is the direct cellular reprogram ming hypothesis-that terminally differentiated cells can be reprogrammed into other adult cell fates without first passing through a stem cell state.

关键词： programming passing proof