Berth allocation with time-dependent physical limitations on vessels

We consider a berth allocation problem in container terminals in which the assignment of vessels to berths is limited by water depth and tidal condition. We model the problem as a parallel-machine scheduling problem with inclusive processing set restrictions, where the time horizon is divided into two periods and the processing sets in these two periods are different. We consider both the static and dynamic cases of the problem. In the static case all of the vessels are ready for service at time zero, while in the dynamic case the vessels may have nonzero arrival times. We analyze the computational complexity and develop efficient heuristics for these two cases. Computational experiments are performed to test the effectiveness of the heuristics and to evaluate the benefits of taking tidal condition into consideration when making berth allocation decisions.     

Novel constraints satisfaction models for optimization problems in container terminals

The growth of containerization and transporting goods in containers has created many problems for ports. In this paper, we systematically survey a literature over problems in container terminals. The operations that take place in container terminals are described and then the problems are classified into five scheduling decisions. For each of the decisions, an overview of the literature is presented. After that, each of the decisions is formulated as Constraint Satisfaction and Optimization Problems (CSOPs). The literature also includes simulations and performance in container terminals. To evaluate any solution methods to the decisions and to measure its efficiency, several indicators are suggested.     

未来无线终端的展望

对目前市场上各种手持通信终端进行了介绍，分析了其存在的问题，对未来无线终端设计的思路及所需解决的问题进行了讨论。     

Information for routing in energy-constrained ad hoc networks

In wireless ad hoc networks consisting of battery-limited nodes, communication protocols must be energy-aware to prevent early network failure due to radios exhausting their energy supplies. Incorporating current estimates of battery levels into routing metrics has been shown to reduce the demand on radios with little remaining energy and allow them to participate in the network longer. In addition to knowledge of current battery levels, estimates of how quickly radios are consuming energy may also be helpful in extending network lifetime. We present a family of routing metrics that incorporate a radio’s rate of energy consumption. Simulation results show that the proposed family of metrics performs well under a variety of traffic models and network topologies.     

Enabling Components for Multi-Standard Software Radio Base Stations

Receiver and transmitter technology is an enablingfactor for the software radio concept, with analogueto digital conversion being the limiting performancefactor. The requirement for common hardware forseveral different systems leads to parameterizedmodules and higher integration levels. Moduledefinition is closely related to the architecturalchallenges of receiver design. Emerging multi-mode base stations favour larger hardware granularity. Thesoftware radio approach reduces the hardwarecomplexity of a cell site from several racks ofdiscrete single-channel radios to one or two shelvesof open architecture modules.This paper presents critical functional blocks forwide-band multi-mode base stations based on thesoftware radio concept. Major component specificationsare reviewed showing the implications on systemdesign. Functional and performance parameters foranalogue to digital converters (ADCs), digital toanalogue converters (DACs), digital down and upconverters are illustrated using specific products.Applications are presented by revisiting existingtransceiver architectures in the framework of nextgeneration wireless standards.     

智能式LED太阳能路灯控制器的设计

太阳能LED路灯照明系统采用市电互补方式,对推广太阳能LED路灯的应用有着现实和经济意义。为了实现太阳能LED路灯的市电互补控制,设计了一种市电互补LED太阳能路灯控制器。该控制器以ARM处理器为核心,通过对蓄电池电压、太阳能电池电压、环境温度等参数进行采样,进入ARM运算决策,可实现温度补偿修正的高准确控制,且具备蓄电池选择功能及市电供电自动切换功能。该控制器应用于路灯改造,既可以减少一次性投资,又可以取得显著的节能减排效果。     

融合通信安全风险分析及防范策略研究

分析了融合通信中的各种风险,包括新消息、新通话和新联系的安全风险,提出了融合通信不良信息防范策略,包括技术管控和业务管控两个方面。     

海事卫星系统发展及应用

介绍了海事卫星系统的发展概况,包括海事卫星主要技术参数和各种终端,如B/M终端、FLEET终端、BGAN终端等。详细论述了BGAN系统及其终端,包括构成、主要性能和关键技术。从技术、业务和设备实现等角度概括了系统发展特点。给出了海事卫星系统主要应用领域,包括远洋运输、航空通信、陆地移动、应急通信及记者新闻采访。     

VSAT系统网管软件

本文从控制功能、软件流程、模块划分和软件方法等方面介绍了工作于Ｗｉｎｏｄｗｓ一半的ＶＳＡＴ系统网管软件。     

Android平台智能移动终端的网络互连和多媒体资源共享

分析了移动终端智能入网机制及Android系统下的Wifi模块。设计了一种Android平台智能移动终端的联网和多媒体资源共享软件。具有该软件的Android平台的智能终端,可主动接入Wifi为底层的DLNA共享网络,并实现各智能终端之间的多媒体资源共享和服务拓展。