Visualizing the ground motions of the 1906 San Francisco earthquake

With advances in computational capabilities and refinement of seismic wave-propagation models in the past decade large three-dimensional simulations of earthquake ground motion have become possible. The resulting datasets from these simulations are multivariate, temporal and multi-terabyte in size. Past visual representations of results from seismic studies have been largely confined to static two-dimensional maps. New visual representations provide scientists with alternate ways of viewing and interacting with these results potentially leading to new and significant insight into the physical phenomena. Visualizations can also be used for pedagogic and general dissemination purposes. We present a workflow for visual representation of the data from a ground motion simulation of the great 1906 San Francisco earthquake. We have employed state of the art animation tools for visualization of the ground motions with a high degree of accuracy and visual realism.     

Remote sensing of salinity in the San Francisco Bay Delta

Salinity of the San Francisco Bay Delta has been studied for the past seven decades. There is a significant gradient in salinity within this estuarine system that influences the growth and distribution of phytoplankton as well as the abundance and migration of shrimp and fish population. Several government agencies which have jurisdictions over this area are attempting to gather extensive data for effectively monitoring of this estuary. Repetitive remotely sensed data acquired from Landsat may be considered by these agencies as having the potential to provide a cost-effective method for gathering and processing water quality related data. In this study, Landsat multispectral scanner (MSS) data and color and color infrared photographs acquired from a U-2 aircraft were combined with surface measurements for salinity mapping of the San Francisco Bay Delta. The salinity measurements and U-2 photography were obtained simultaneously and coincident with landsat overpass. A regression model was developed between the surface truth data and Landsat digital data for 29 preselected sample sites and was then extended to the entire study area. The results included a salinity map of the study area and the statistical summaries. The results were in general agreement with the reported distribution of salinity values in the literature for the same time of the year. Based on the results and the associated analyses of natural color and color infrared photographs and Landsat color composite imagery, it was concluded that: (1) it was virtually impossible, at least within this test site, to establish any quantitative judgement regarding the salinity values by visual interpretation of the imagery; and (2) the present study constitutes the first effort to successfully use Landsat digital data for salinity mapping, by means of digital processing, for this geographic area.     

Non-technical communication factors at the Vessel Traffic Services

This study done at the Vessel Traffic Services (VTS) explored how the VTS operators (VTSOs) communicated with ships and other actors in the maritime sociotechnical system and how decisions were made with regard to assisting traffic in maintaining safe passage in port areas, where most vessel movements are seen and accidents occur. The fieldwork was done during four independent visits to a VTS centre under the Swedish Maritime Authority, with a total sample of six VTSOs and one VTS instructor. The qualitative data were sorted and coded using a grounded theory approach. The data pointed at non-technical information processing and communication factors that play a role in decision-making and ultimately in safety. During protocol operations at the VTS, these factors influenced how VTSOs judged the skills of the vessels’ bridge teams, and how they approached them. This is a time where much effort is being put into upgrading technological systems, and these will have the power to change the ways in which the maritime network obtains and processes information, as well as how they can communicate with each other. The further development of technological systems, work protocols and training programmes can benefit from taking the soft aspects of communication and the needs of the operators and their tasks into account for the enhancement of safety.     

Delphi在基于网络通信的城市交通诱导屏系统的应用

本文介绍了城市交通诱导屏系统，并详细描述了Delphi6.0的TNMUDP组件在城市交通诱导屏网络通信中的应用。     

公交车辆的监控和调度系统

开发了一个简易多功能的公交车辆监控和调度系统,系统由多功能车载终端和监控调度软件组成;车载终端由超低功耗单片机MSP430F1611、GPS、GPRS和自动计数等模块组成,该终端以最低的硬件资源实现了远程监控、自动报站和超速报警等多项功能;监控调度软件结合GIS平台和智能调度管理,实现对车辆实时动态地监控和智能调度;TCP/IP通讯协议保证了数据交换的实时性和准确性;系统测试证明了该系统的可靠性和稳定性.     

A Closed-Loop Control Traffic Engineering System for the Dynamic Load Balancing of Inter-AS Traffic

Inter-AS outbound traffic engineering (TE) is a set of techniques for controlling inter-AS traffic exiting an autonomous system (AS) by assigning the traffic to the best egress points (i.e. routers or links) from which the traffic is forwarded to adjacent ASes towards the destinations. In practice, changing network conditions such as inter-AS traffic demand variation, link failures and inter-AS routing changes occur dynamically. These changes can make fixed outbound TE solutions inadequate and may subsequently cause inter-AS links to become congested. In order to overcome this problem, we propose the deployment of a closed-loop control traffic engineering system that makes outbound traffic robust to inter-AS link failures and adaptive to changing network conditions. The objective is to keep the inter-AS link utilization balanced under unexpected events while reducing service disruptions and reconfiguration overheads. Our evaluation results show that the proposed system can successfully achieve better load balancing with less service disruption and re-configuration overhead in comparison to alternative approaches.     

The ISPS 2017 editorial for the 26th annual conference on information storage and processing systems,San Francisco,California, USA

Microsystem Technologies -     

交通灯的一种智能模糊控制系统

本文设计了一种新型交通灯智能模糊控制系统，突破了传统机械的定时模式，利用模糊控制算法对四相位三车道单交叉口的交通灯进行控制．可以依据实时交通流量灵活运行。通过模糊规则，即对当前等待队列长与通行队列长以模糊推理，得到最佳的绿灯延时时间。仿真结果表明模糊控制方法在车辆延误时间上较之传统定时控制方法大为改善，使公路利用率产生可观的经济效益。     

通用网络流量监测报警系统的设计与实现

针对日趋复杂的网络系统环境，提出一种基于SNMP网络管理协议，使用JAVA语言和科学的网络测量方法，实现对网络流量的采集、计算网络带宽利用率等功能的网络流量监测系统，同时使用修正后的指数平滑法建立自适应流量预测模型，进行网络流量的预测，对网络流量突发情况及时报警，以达到科学、有效、精确地管理网络。     

交通灯的一种智能模糊控制系统

本文设计了一种新型交通灯智能模糊控制系统,突破了传统机械的定时模式,利用模糊控制算法对四相位三车道单交叉口的交通灯进行控制,可以依据实时交通流量灵活运行。通过模糊规则,即对当前等待队列长与通行队列长以模糊推理,得到最佳的绿灯延时时间。仿真结果表明模糊控制方法在车辆延误时间上较之传统定时控制方法大为改善,使公路利用率产生可观的经济效益。     

Adaptive Multiagent System for Network Traffic Monitoring

An application of agent-based data mining for near-real time detection of attacks against the computer networks and connected hosts is based on processing network traffic statistics provided by high-speed network monitoring cards and using a set of known anomaly-detection techniques to identify the anomalous behavior. The individual anomaly-detection methods have relatively high error rates that make them unfit for most practical deployments. Using the agent-based trust modeling technique, the Camnep system fuses the data provided by anomaly-detection methods and progressively builds a better classification with an acceptable error rate. The system uses agent-based self-adaptation techniques to dynamically align its structure with the changes in network traffic structure and attacks.     

基于视网膜血管分割的系统设计与实现

视网膜血管是唯一一种可直接观测的人体微型血管。医生可通过观察视网膜中的微血管结构,有效判断患者是否存在疾病。通过模糊C-均值聚类算法和均值滤波算法分割视网膜血管边缘,利用MATLAB的图形用户界面开发环境设计控件,通过性能测试将分割的视网膜血管和测试数据进行对比,得出算法的准确率,保证图像分割的正确性、准确性。     

Ajax在油藏模型显示分析系统的应用

为了解决油藏模型显示分析系统中存在的服务器响应延迟、用户等待时间长等问题,提出一种将Ajax技术应用到原系统的改进方案.在原有系统架构的基础上增加Ajax引擎,分担服务器的部分业务逻辑,将页面表现与应用逻辑进行分离.通过页面的局部更新,实现了地图加载与信息查询过程的页面无刷新.实验结果表明,Ajax技术在系统中的应用,有效减少了网络中的数据传输与处理,降低了服务器负载,避免了服务器响应延迟,使用户体验得到了优化.     

An economical tonal display for interactive graphics and image analysis data

The use of tonal displays in image analysis and interactive graphics has always dictated the use of expensive refresh memories for the display output device. This has involved the use of high speed digital drums, multiple head discs, and analog storage tubes. Recently, the introduction of very long shift registers has allowed the designer to consider their use for refresh memories. A prototype display using 1024 bit MOS static shift registers has been developed. It has been shown that a reasonable cost versus performance tradeoff can be obtained. The first efforts has resulted in a 128 × 128 × 4 bit (64k) memory; it is now in the process of being expanded to 256 × 256 × 8 bits (512k). This memory is cost competitive with digital disc memories and both cost and performance competitive with storage tube scan converters.     

面向流量经营的网关系统的引入及应用分析

基于流量经营,分析了流量的3个层次,并探讨了面向平台层流量,在业务网络侧引入网关系统——流量综合网关,并通过流量综合网关对平台层流量的干预和深加工,突破流量层次,实现流量的增值。     

MOTHER: System for continuous capturing of display stream

This paper describes an efficient technique to record display output stream with memory resident software. This kind of recording can be made useful for studying text writing processes experimentally, for example programmers behaviour during coding. The system is inconspicuous in test situation and does not seem to affect the testees working. Separate software has been developed for reviewing captured sessions.     

轨道交通电力培训仿真系统

前言由于近年来城市建设的发展，轨道交通已显得越来越重要。为此，我们综合上海轨道交通明珠线供电系统（以下简称明珠线）的应用经验上，开发了轨道交通电力培训仿真系统。系统结构及组成本系统是网络化多媒体的电力仿真系统。系统结构如图1所示，由一套多媒体教学系统、九台计算机和一台打印机组成。其中一台为教师用机，八台为学员用机，如有需要，学员用机可扩展。系统运行在WindowsNT4.0操作系统下，运用最新的计算机网络技术和多媒体技术，具有界面直观友好、灵活易用，并可随意升级、免维护等优点。多媒体教学教师机打印机学员用…     

交通灯智能控制系统的设计与实现

针对传统交通灯存在不能根据车流量大小自动调节通车时间的缺点,提出利用单片机设计智能交通灯的方案。进一步作系统硬件电路和系统程序的分析与设计;简介PROTEUS的功能及用PROTEUS对电路进行仿真的过程和结果。并且说明硬件制作的过程与安装调试的结果。