元代邮驿史研究综述

近年来不少学者致力于元代邮驿史的研究,内容涉及到元代邮驿的方方面面,有通史性研究、区域性研究,也有驿路、驿站及元代牌符方面的研究,出版了不少专著和论文,取得了很大的成果,表明元代邮驿史的研究大有可为。对已经发表的元代邮驿史研究文章进行了系统的梳理和归纳总结,探讨了他们的不足,对未来元代邮驿史的研究提出了建议。只有不断进行阅读、比较、借鉴,及时总结经验教训,合理运用古籍图书、文牍史料,元代邮驿史的研究才会达到新的高度。

抓小偷义不容辞

6月27日下午1时许,兰州支队特勤中队战士魏永庆、曹宏去天水路邮电局汇款。正当他们在汇款处排队等候时。

Multi-objective evolutionary approach for UAV cruise route planning to collect traffic information

Unmanned aerial vehicle(UAV)was introduced as a novel traffic device to collect road traffic information and its cruise route planning problem was considered.Firstly,a multi-objective optimization model was proposed aiming at minimizing the total cruise distance and the number of UAVs used,which used UAV maximum cruise distance,the number of UAVs available and time window of each monitored target as constraints.Then,a novel multi-objective evolutionary algorithm was proposed.Next,a case study with three time window scenarios was implemented.The results show that both the total cruise distance and the number of UAVs used continue to increase with the time window constraint becoming narrower.Compared with the initial optimal solutions,the optimal total cruise distance and the number of UAVs used fall by an average of 30.93% and 31.74%,respectively.Finally,some concerns using UAV to collect road traffic information were discussed.

THE PN2I NETWORK: A SCALABLE BANYAN NETWORK

To design a Banyan network with an arbitrary even-sized port number, the PN2I network is proposed. The PN2I network can be divided into two classes: the complete and incomplete versions. A simple routing algorithm is given, but in the incomplete PN2I networks,this routing algorithm fails to make the traffic in links even, which deteriorates the performance badly. Thus a new routing algorithm is proposed, which makes the incomplete PN2I networks behave almost the same as the PN2I networks with respect to the performance issues.

Applying Hopfield neural networkto QoSroutingin communication network

The main goal of routing solutions is to satisfy the requirements of the Quality of Service (QoS) for every admitted connection as well as to achieve a global efficiency in resource utilization.In this paper proposes a solution based on Hopfield neural network (HNN) to deal with one of representative routing problems in uni-cast routing,i.e.the multi-constrained(MC) routing problem.Computer simulation shows that we can obtain the optimal path very rapidly with our new Lyapunov energy functions.

Topology aggregation with multiple QoS parametersfor scalable routing problem

In this paper, we investigate the problem of topology aggregation in QoS-based routing. We propose a new algorithm to perform full-mesh and modified-star aggregation, which is simple and effective in a network with additive and concave parameters constrained. The time complexity is O(b^2), where b is the number of border nodes. We extend the algorithm to topology aggregation with multi-parameters constrained. The simulation results show that our algorithm has very good performance in terms of success ratio.

Distributed QoS-aware source-specific multicast routing protocol

A distributed QoS (quality of service) -aware source-specific multicast routing protocol—DQSSMR is proposed to increase the successful join ratio and lower the overhead of the control message in QoS required multicast routing. By an improved searching strategy, the cost of message control is reduced and the successful join ratio is increased. The network load is balanced due to the distributed routing operation and the scalability is enhanced further because of the usage of SSM (source- specific multicast) service model in DQSSMR. The analysis results indicate that DQSSMR performs as expected.

提倡立体集邮

“立体集邮”乃我新创的一个名词。何谓“立体集邮”?是相对于邮票——邮册——邮集的“平面集邮”而言。何谓“平面集邮”?邮折上、邮册里的邮票、邮品,不论你怎么摆放,都是平面的、二维的;邯集贴页上的邮票、邮品,不论你如何展出,也是平面的、二维的。常规的集邮,不论是传统集邮的方式,还是专题集邮的方式,不论是搜集、整理,还是欣赏、研究,基本上是静态的“平面集邮”,只有少数集邮类别如极限集邮、原地集邮和某些需要实地考查邮路邮史的例外。“立体集邮”就是让邮票立起来,让集邮者走近邮票、走进邮票。