房地产开发企业的成本管理与控制

企业对开发成本各项费用的管理主要体现在对项目的策划、规划设计、招投标、施工、材料及设备采购、销售、工程预结算、物业管理等几个环节的成本控制。该文主要针对各个阶段成本管理与控制的主要内容、要点及方法提出了一些建议。     

并联式混合动力城市客车驱动系统研究

针对城市公交运行工况的特点,以混合动力系统为研究对象,设计集中变速电驱动的单轴并联式混合动力系统,对动力系统主要部件进行匹配与设计,并进行实车道路试验。试验表明,该方案能够实现整车的燃油经济性和动力性目标,并且成本控制合理。     

输出端口编码的可扩展快速转发方法

提出了一种基于路由器端口编码的转发方法（OPCF）,该方法通过在通信源和目的间预先建立起面向连接的端口编码路径,可直接根据端口编码对数据包进行路由,避免了路由表查询开销,实现了基于显式路由的灵活快速转发,有助于网络服务质量的提高和流量工程的实现．由于不需要路由器存储和管理除路由表外的额外信息,OPCF可获得良好的扩展性．由于可隐藏数据包的IP地址信息,OPCF能有效增强网络通信的安全性．原型系统上的实验结果表明,该方法能实现比MPLS更低的端到端延时并能有效提高网络的吞吐量．     

Terminal investment timing decisions in a competitive setting with uncertainty using a real option approach

This paper uses a real option approach to analyze terminal investment timing decisions for situations in which a port faces competition from its rivals in an uncertain market. We propose a network model to describe carriers’ cargo routing decisions and competition among rival ports. We then transform this model into a multicommodity flow problem and use the column generation algorithm to solve it. After obtaining a port’s possible future annual revenues and the potential net present value (NPV) for its terminal construction project through the network model, we adopt the expanded NPV rule and transform the investment timing decision into an optimal stopping problem. A least squares Monte Carlo simulation algorithm is proposed to find the investing probabilities for future years. The proposed models are applied to a steel cargo terminal investment case in the Port of Bengbu in Anhui province of China. The impacts on the investing probability and the expanded NPV of changes in the demand volatility, the initial investment and the port discharging rate are analyzed to provide managerial insights for port managers.     

小缸径低速柴油机加装EcoEGR系统设计与布置

某型火车滚装船布置2台小缸径低速柴油机加装经济型废气再循环（Economical Exhaust Gas Recirculation,EcoEGR）系统,以满足Tier Ⅲ排放要求。以该船为依托,对该类型主机及相应船舶管路与控制系统的原理设计、实船布置等进行介绍和深入分析,为后续或类似船舶的小缸径低速柴油机加装EcoEGR系统及设备设计与建造提供有价值的参考。     

基于全寿命保障的舰船交互式电子技术手册应用技术研究

交互式电子技术手册(IETM)是全寿命保障的关键应用技术之一,在提高工作效率,增强舰船维修性和保障性方面有较显著优势。文章以电子手册编制为起点,结合舰船研制与设计特点以及规范素材要求,依据相关标准进行产品结构SNS确认,进而选取合理的信息码,最终确认型号的DMRL清单。考虑到舰上人员变动快、自训能力滞后,探讨电子手册与培训系统内容集成的可行性,切实提高电子技术手册的实用性。     

基于实数编码遗传算法的基础沉降预报

提出一种基于实数编码的遗传算法的地基基础沉降预测方法。根据施工中地基基础沉降的观测资料,对以后地基基础沉降值做出预报。计算实例表明,用该方法进行地基基础沉降预报有较高的精度,而且对基础上部荷载有变化的情况也能做出较精确的预报,可以应用到实际工程中。     

Assessment of investment decision in the dry bulk shipping market based on real options thinking and the shipping cycle perspective

As the dry bulk shipping market seems to have been stuck in a trough period for a long time, investors need to pay more attention to their investment strategies to survive during this period. This study aimed to find a suitable model to assess dry bulk ship investment decisions in the tough and peak periods based on real options theories. Two options, involving an abandonment option and a deferrable option, were used to define investors’ responses to the uncertainty in investment processes such as stopping or selling vessels. The option valuation was solved by using a binomial valuation model, due to data limitations. In accordance with shipping cycle theories, different volatility parameters for the tough and peak periods were calculated using a generalized autoregressive conditional heteroskedasticity (GARCH) model. The application of the real options model to a case study involving secondhand ship trading indicated its viability. According to the results of the case study, the new model has advantages over the traditional net present value (NPV) method in uncertain investment environments. Thus, the results demonstrate that the real options model is a more suitable method for use in the current dry bulk shipping market.     

一种适合地面遥测接收站的语音编码方法

论文提出了一种适用于地面遥测接收站的语音编码方法。针对地面简易站扩频接收带宽小的特点,在混合激励线性预测（MELP）算法的基础上,设计了一种2．4Kbps的低速率语音编码算法。该算法通过增加帧长、多帧联合及参数内插等方法降低语音的编码速率。经仿真结果表明该语音编码方法适合目前地面遥测接收站技术要求,实用性强,适合在其它遥测系统中推广应用。     

基于设计生产管理一体化的船舶物资编码研究

从设计生产管理一体化的角度分析了现代造船企业中船舶物资编码的现状和存在问题,阐述了现行的物资编码体系无法实施的原因,在此基础上提出了符合设计生产管理一体化的物资编码方案,并对该方案下的物资编码自动生成过程进行了详细描述。