Visual Basic语言在公路工程设计中的应用

介绍了Visual Basic语言的特点,并通过与实际开发项目相结合,介绍了Visual Basic编程语言在公路工程中的应用.     

本科教学工作水平评估指标体系研究

对现在使用的我国普通高等学校本科教学工作水平评估指标体系的主要优点和问题进行分析，提出完善我国普通高等学校本科教学工作水平评估指标体系的建议。     

Admission control scheme for handover service in high-speed train communication system

Admission control in high-speed train communication system is quite different from admission control in traditional cellular networks. Conventional admission control strategies cannot be directly applied to this special communication scenario. In this paper, the problem of admission control for handover service is investigated in high-speed train communication environment. An admission control scheme considering bit error rate(BER)and bandwidth borrowing strategy is proposed. On the basis of admission control decision rule taking BER into account, a part of bandwidth obtained by compressing variable rate service in the networks is provided for handover services. The admission control scheme can admit handover services as more as possible while it guarantees the lowest data rate of different services in the networks. Simulation results show that the proposed admission control scheme has a better performance than existing admission control schemes.     

船舶电力变频器电压抑制策略研究

为解决常规船舶电力变频器电压抑制方法存在抑制有效性较低不足,提出一种新的船舶电力变频器电压抑制策略。基于船舶电力变频电压抑制模块,以及船舶电力变频电压抑制程序的搭建,实现变频器电压抑制模型的构建;依托电压抑制参数的确定以及抑制过程的设计,实现了船舶电力变频器电压抑制策略,试验数据表明,本文变频器电压抑制方法较常规抑制方法,平均抑制有效性提高53.71%,适合船舶电力变频器电压抑制。     

船用电力变压器故障在线检测系统设计与实现

现有的电力变压器故障在线检测系统具有检测精度差、效率低的弊端,为此引入光声光谱技术对船用电力变压器故障在线检测系统进行设计与实现。电力变压器故障在线检测系统硬件设计主要包括油气分离装置、光声腔与锁相放大器设计,软件主要包括光声信号处理模块、锁相放大模块与电力变压器故障判定模块。通过硬件与软件的设计实现了电力变压器故障在线检测系统的运行。通过实验验证,与现有的电力变压器故障在线检测系统相比,设计的电力变压器故障在线检测系统极大的提升了检测的精度与效率,充分说明设计的电力变压器故障在线检测系统具备更好的检测性能。     

A Distributed Power Allocation Scheme in Green Cognitive Radio Ad Hoc Networks

For the realization of green communications in cognitive radio ad hoc networks(CRAHNs), selfadaptive and efficient power allocation for secondary users(SUs) is essential. With the distributed and timevarying network topology, it needs to consider how to optimize the throughput and power consuming, avoid the interference to primary users(PUs) and other SUs, and pay attention to the convergence and fairness of the algorithm. In this study, this problem is modeled as a constraint optimization problem. Each SU would adjust its power and corresponding strategy with the goal of maximizing its throughput. By studying the interactions between SUs in power allocation and strategy selection, we introduce best-response dynamics game theory and prove the existence of Nash equilibrium(NE) point for performance analysis. We further design a fully distributed algorithm to make the SUs formulate their strategy based on their utility functions, the strategy and number of neighbors in local area. Compared with the water-filling(WF) algorithm, the proposed scheme can significantly increase convergent speed and average throughput, and decrease the power consuming of SUs.