Application software

About: Application software is a research topic. Over the lifetime, 12185 publications have been published within this topic receiving 219822 citations. The topic is also known as: software application & application software.

Architectural principles for safety-critical real-time applications

Abstract: This paper addresses the general area of computer architectures for safety-critical real time applications. The maximum acceptable probability of failure for these applications ranges from about 10/sup /spl minus/4/ to 10/sup /spl minus/10/ per hour depending on whether it is a military or civil application. Typical examples include commercial and military aircraft fly-by-wire, full authority engine control, satellite and launch vehicle control, ground transport vehicles, etc. Realtime response requirements for these applications are also very demanding, with correct control inputs required every 10 to 100 ms, depending on the application. These dual goals of ultrahigh reliability and real-time response necessitate computer systems that are quite different from other dependable systems in their architecture, design and development methodology, validation and verification, and operational philosophy. This paper highlights these differences by describing each of these aspects of safety-critical systems. Architectural principles and techniques to address these unique requirements are described. >

Transaction dispatcher for a passenger entertainment system, method and article of manufacture

Abstract: A computer is used to manage communication over a network between one or more network addressable units and a plurality of physical devices of a passenger entertainment system. The system is configured and operated using software to provide passenger entertainment services including audio and video on-demand, information dissemination, product and service order processing, video teleconferencing and data communication services. The system includes a system server and a network supporting multiple computer processors. The processors and the server comprise application software that control telephony applications and network services. The server is coupled by way of the network to physical devices of the system. The server comprises software that instantiates a network addressable unit server that interfaces to one or more network addressable units, that instantiates a services server that interfaces to one or more service clients that provide services of the passenger entertainment system, and that instantiates a router and one or more mail slots comprising a lookup table that identify each of the clients. Data comprising a network routing address and a physical device type are used to access the lookup table to determine message destinations. The respective servers interface to their clients by way of named pipes that translate messages from a first format to a second format. The server also comprises software that instantiates intranodal thread processors that route messages between processes on the physical devices and the one or more service clients to route services of the passenger entertainment system to the processes on the physical devices.

Towards physical mashups in the Web of Things

Abstract: Wireless Sensor Networks (WSNs) have promising industrial applications, since they reduce the gap between traditional enterprise systems and the real world. However, every particular application requires complex integration work, and therefore technical expertise, effort and time which prevents users from creating small tactical, ad-hoc applications using sensor networks. Following the success of Web 2.0 “mashups”, we propose a similar lightweight approach for combining enterprise services (e.g. ERPs) with WSNs. Specifically, we discuss the traditional integration solutions, propose and implement an alternative architecture where sensor nodes are accessible according to the REST principles. With this approach, the nodes become part of a “Web of Things” and interacting with them as well as composing their services with existing ones, becomes almost as easy as browsing the web.

The LiteOS Operating System: Towards Unix-Like Abstractions for Wireless Sensor Networks

Abstract: This paper presents LiteOS, a multi-threaded operating system that provides Unix-like abstractions for wireless sensor networks. Aiming to be an easy-to-use platform, LiteOS offers a number of novel features, including: (1) a hierarchical file system and a wireless shell interface for user interaction using UNIX-like commands; (2) kernel support for dynamic loading and native execution of multithreaded applications; and (3) online debugging, dynamic memory, and file system assisted communication stacks. LiteOS also supports software updates through a separation between the kernel and user applications, which are bridged through a suite of system calls. Besides the features that have been implemented, we also describe our perspective on LiteOS as an enabling platform. We evaluate the platform experimentally by measuring the performance of common tasks, and demonstrate its programmability through twenty-one example applications.

RTDS - A Fully Digital Power System Simulator Operating in Real Time

Abstract: Abstruct - This paper presents details on the design, architectural features and applications of a real-time digital simulator (RTDSm) developed at the Manitoba HVDC Research Centre (Winnipeg, Canada). Custom hardware and software have been developed and collectively applied to the simulation and study of electromagnetic transients phenomenon in power systems in real-time. The combination of real-time operation, flexible YO, graphical user interface and an extensive library of accurate power system component models make the RTDS an ideal simulation tool with a wide range of applications. I. INTRODUCTION Simulation has long been recognized as an important and necessary step in the development, design and testing of power generation and transmission systems. A wide variety of both analogue and digital simulation tools are available and typically used during various stages of system development. Recent advances in both computing hardware and sophisticated power system component modelling techniques have significantly increased the application of digital simulation in the power system industry. Of particular interest in the context of this paper are the advances made in the study of electromagnetic transients phenomenon.