基于深度强化学习的有轨电车信号优先控制

现有的有轨电车信号优先控制系统存在诸多问题, 如无法适应实时交通变化、优化求解较为复杂等. 本文提出了一种基于深度强化学习的有轨电车信号优先控制策略. 不依赖于交叉口复杂交通建模, 采用实时交通信息作为输入, 在有轨电车整个通行过程中连续动态调整交通信号. 协同考虑有轨电车与社会车辆的通行需求, 在尽量保证有轨电车无需停车的同时, 降低社会车辆的通行延误. 采用深度Q网络算法进行问题求解, 并利用竞争架构、双Q网络和加权样本池改善学习性能. 基于SUMO的实验表明, 该模型能够有效地协同提高有轨电车与社会车辆的通行效率.     

基于BDS/GPS和百度地图的现代有轨电车监控系统的设计

为实现对现代有轨电车车辆的位置及运行状态进行实时监控,设计了一个基于BDS/GPS和百度地图的现代有轨电车监控系统;定位终端以具有我国自主知识产权的BDS/GPS双模定位模块为主,RFID系统作为辅助定位手段;数据通过HTTP的GET方法提交至服务器,由服务器端的PHP页面自动处理后存储到MySQL数据库,中心管理平台显示页面调用百度地图API,将数据显示在百度地图上;最终该系统可以实时获取并存储列车的位置坐标、速度、时间等信息,并在百度地图上以点、线和图表的形式显示出车辆的坐标和运行轨迹等;测试结果表明,该系统运行稳定,定位精度高,获取数据准确、时延小,能够满足应用需求。     

Information system FOLKLORE: A new technique for system documentation

Effective system documentation is an essential part of a management information system. Yet it is common to witness users struggling with a system that has incomplete or missing documentation. This is a consequence of systems analysts feeling that there is no time to even start documenting; preferring to do more desirable or rewarding tasks; or simply being concerned that their documentation of an inherited system might be wrong. To overcome these barriers to good documentation, FOLKLORE was created and is now implemented at the University of Nebraska-Lincoln. The framework for FOLKLORE, its costs and benefits, and examples from FOLKLORE documents are presented.     

Eurotra: General system design

This article gives a general overview of the technical, scientific and philosophical character of the Eurotra machine translation program, outlines its developmental history and lists some plans for future work.The authors thank Steven Krauwer for valuable comments.     

Stratigraphic analysis system: SAS

Stratigraphic Analysis System (SAS) is an on-line, interactive data-base analysis system designed for use in a subsurface laboratory. The program is written in FORTRAN and ALGOL W and presently runs under the Michigan Terminal System at the University of Michigan.The SAS system was designed to overcome several problems in geological data-base systems. Both data discontinuities and substring indexing have been considered as well as three-dimensional location of information.The system consists of four procedures; the command processor, the user aid package, the data-set loader and general data processors. The data set is composed of hierarchical records in a one-dimensional array which consists of logical flags to index an internal dictionary.Presently output contains well listings, well displays, data editing and data search capabilities.     

Ex-W-Pert system: A Web-based distributed expert system for groupware design

The World Wide Web (Web) allows people at remotely located sites to communicate and share their ideas using a common communication protocol. A common use of the Web system is running a client application, using a browsing tool, by pointing to a local or proxy server to browse data written in the hypertext format that contains anchors that address other URLs. In this paper a new application of the Web system for sharing knowledge-based systems and groupware development activities is introduced. An architecture for a Web-based Distributed Expert System (Ex-W-Pert System) is proposed and an implementation of the proposed architecture in groupware design is demonstrated. The resources and knowledge bases are distributed and can be accessed through the internet.     

The graf system: An interactive graphic system for teaching mathematics

GRAF is a software package developed to visualize real functions of the form y = f (x) of x = x (t), y = y (t). It also allows the study of rotations, translations, enlargements, compositions of functions and so on. The user is given uniform and easy interaction possibilities with the package. GRAF is written in the BASIC language and run on a Tektronix 4051 graphic desktop computer. This package has been developed for didactical application, particularly in high schools. It has been tested with students in many mathematic courses.     

Web system requirements: an overview

The development of online and Web-based systems is becoming increasingly critical to the business strategy of many organisations. Although this development can be viewed as a form of software development, it has various unique characteristics. One of the most significant is the uncertainty in domain understanding by both clients and developers. Another is the way in which Web solutions typically lead to changes in business models and hence requirements. These are manifested as significant volatility in the requirements of these systems. In this survey paper we investigate the handling of requirements for Web systems including looking at both commercial practice and current research. We report on the outcomes of a comprehensive set of interviews and follow-up surveys, and argue that the Web system requirements process needs to be fundamentally different from more conventional systems, incorporating the design process into the identification of requirements resulting in a design-driven requirements process.     

TMS: A free-form text-management system

TMS (Text Management System) is a database management system that supports an access method based on both select and search queries. TMS provides support for variable-length records with pointer fields within the relation. Pointers can be used to support not only text but data from any media, such as graphics and images. An inverted index based on the variable-length record structure is used for speedy retrieval of records based on keywords. In this paper, the variable length record management of TMS and the keyword-based retrieval mechanism are described.     

Multiple-bus shared-memory system: Aquarius project

A multiple-bus architecture called a multi-multi is presented. The architecture is designed to handle several dimensions with a moderate number of processors per bus. It provides scaling to a large number of processors in a system. A key characteristic of the architecture is the large amount of bandwidth it provides. Each node in the architecture contains a microprocessor, memory, and a cache. The cache-coherence protocol for the multi-multi architecture combines features of snooping cache schemes, to provide consistency on individual buses, with features of directory schemes, to provide consistency between buses. The snooping cache component can take advantage of the low-latency communication possible on shared buses for efficiency, yet the complete protocol will support many more processors than a single bus can. The resulting protocol naturally extends cache coherence from a multi to a multi-multi. Cache and directory states are described. Concepts that allow efficient performance, namely, local sharing, root node, and bus addresses in the directory, are discussed     

THRED: a two-handed design system

This paper describes a computer-aided design system for sketching free-form polygonal surfaces such as terrains and other natural objects. The user manipulates two 3D position and orientation trackers with three buttons, one for each hand. Each hand has a distinct role to play, with the dominant hand being responsible for picking and manipulation, and the less dominant hand being responsible for context setting of various kinds. The less dominant hand holds the workpiece, sets which refinement level that can be picked by the dominant hand, sets the constraint mode and the reshape operator, and generally acts as a counterpoint to the dominant hand. In this paper, the architecture of the system is outlined, the interaction techniques are presented, and a simple surface is shown.     

ES-Kit: An object-oriented distributed system

This paper describes the design, implementation, and performance of ES-Kit, a distributed object-oriented system being developed by the Experimental Systems Project at the Microelectronics and Computer Technology Corporation. The operating system consists of a kernel and a set of Public Service Objects which dynamically extend the functionality of the kernel by providing several traditional operating system services when required by application objects. Applications for the ES-Kit environment are written in GNU C++ and do not require additional language primitives for distributed execution. Initial performance results from a representative set of applications indicate that the object-oriented paradigm provides a powerful solution to distributed programming.     

Mosys: the MODULA-2 system

Over the past three decades, hardware engineering has increased the density of systems by several orders of magnitude by using large-scale integration of components into more and more comprehensive and useful modules. Unfortunately, the development of software has lagged behind because neither the intellectual nor the practical tools have been available for software engineers to use the same techniques to improve their productivity in a similar way. The Mosys system — with its combination of work environments, project management support, modula-2 and an extensible library of software components packaged into modules — provides the tools needed for building and supporting modern systems for personal-computer, workstation, realtime and embedded computer applications. This paper reviews the design rationale and structure of the Mosys system.     

TraPhyC-BV: A hydrologic information system

Digital Elevation Models are used to automatically map the drainage network, the stream channel and divide networks of a watershed. This has been done with the TraPhyC-BV software package. Construction of a code describing the network may form the basis for an efficient hydrologic information system. This form of discretization of a watershed produces natural units for problems involving surface or subsurface water flow. This methodology is designed to aid in the parametrization of a distributed components approach to watershed simulation in the fields of hydrology, sedimentology and geomorphology.     

ANEMIA: an expert consultation system

Anemia is a knowledge-based consultation program for anemic states. It has been built using an artificial intelligence programming scheme, called EXPERT, which was developed at Rutgers University. At present, ANEMIA is able to provide assistance in the diagnosis and management of 64 disease entities. They include iron deficiency anemias, anemias due to chronic disorders, thalassemias, hemolytic anemias, arigenerative anemias, and a few other miscellaneous conditions. ANEMIA was tested against a data base of 220 retrospective and 100 new cases and the overall accuracy in the diagnostic performance was pretty good. Our intent is that ANEMIA ultimately will be able to serve as surrogate for the hematologist with the nonhematologist physician-user.