Database-centric architecture

About: Database-centric architecture is a research topic. Over the lifetime, 1799 publications have been published within this topic receiving 48836 citations.

Control and Actuation in Data-Centric Wireless Sensor Networks

Abstract: In this paper we will explore control and actuation mechanisms in sensor networks. Dynamic changes in link quality encourage the use of connection-less, best effort communication protocols. Large scale and ad hoc methods of deployment, coupled with resource-constrained small form factor nodes, suggest the use of data*centric routing mechanics. Directed diffusion [1] is one of such mechanism. Through its use of data-centric routing, allows for energy savings during request and data dissemination in the network. This makes it suitable for use in wireless ad-hoc sensor networks in environmental sensing and monitoring. Sensing and monitoring applications have been the primary focus of most research in the area of data-centric networks. However, control and actuation in such networks has received insufficient attention. Resource constraints and energy limits encourage the use of tiered architectures. Such architectures would include nodes with different sensing, actuation and processing characteristics. Some nodes may have fixed location, while others may be mobile. Static nodes might perform sensing and locally distributed computations, while mobile nodes roam the network providing additional services such as high-fidelity sample collection, augmentation, and in some cases remediation and computation. A scenario that would leverage such an architecture might be a set of static nodes requesting additional sensing capability from a mobile network tier. The mobile tier in turn would self-organize and attempt to fulfill the request. This scenario suggests the need for in-network control and actuation protocols. The latency benefits of distributed in-network processing (as contrasted with cenwalized edge processing) are particularly critical for actuation. In this paper we explore one possible approach to control and actuation in datacentric sensor networks, Two-Way diffusion. The key to our approach is the use of the communication protocols that are native to the data-centric sensor network. Such homogeneity of communications seems to promise a more simple implementation, which translates into lower resource and energy requirements. The sequence of events is the following:

Structuring distributed shared memory with the pi architecture

Abstract: The authors examine the use of a new architecture for the design of system software. The architecture allows the construction of flexible system software components, and the resulting realizations can be tailored to the needs of various applications. The focus is on the application of that architecture to distributed shared memory (DSM). The system software architecture, called pi , defines elements of system software as generalized objects. These x objects have two interfaces: one for usage and one for additional control. pi enables system software components to evolve as computer hardware evolves and it addresses the demands emerging classes of applications like object-oriented databases and multimedia. The pi architecture and its use in a DSM subsystem for clustered workstations are discussed. >

Models of Architecture: Reproducible Efficiency Evaluation for Signal Processing Systems

Abstract: The current trend in high performance and embedded signal processing consists of designing increasingly complex heterogeneous hardware architectures with non-uniform communication resources. In order to take hardware and software design decisions, early evaluations of the system non-functional properties are needed. These evaluations of system efficiency require high-level information on both the algorithms and the architecture. In this paper, we define the notion of Model of Architecture (MoA) and study the combination of a Model of Computation (MoC) and an MoA to provide a design space exploration environment for the study of the algorithmic and architectural choices. A cost is computed from the mapping of an application, represented by a model conforming a MoC onto an architecture represented by a model conforming an MoA. The cost is composed of a processing-related part and a communication-related part. It is an abstract scalar value to be minimized and can represent any non-functional requirement of a system such as memory, energy, throughput or latency.

Describing software architectures by system structure and properties

Abstract: To support architecture based development, different modeling notations and languages, so called architecture description languages (ADLs), have been designed. To be of help in the development process, software architectures must be described in a complete and consistent manner but without being overloaded with information provided to the system stakeholders. Current architecture description languages provide information about software architectures in a domain independent way. This may lead to inappropriate and incomplete descriptions of software architectures. We introduce a flexible and extensible language called Architecture Structure Description Language (ASDL) developed for describing structural aspects of software architectures and their properties. We thereby focus on the domain of embedded real time systems that have to meet certain timing and safety constraints. The language was developed in an architecture recovery process of a real world Train Control System (TCS) and has been used to describe and reason about TCS's architecture.

Application Specific Instruction Set Processors: redefining hardware-software boundary

Abstract: Logic functions have many different architectural alternatives for their implementations. These range from dedicated combinational and sequential architectures to different types of programmable CPU architectures. Each architectural alternative presents a unique set of advantages and limitations. The choice of an architecture is decided based on how well the speed-power-cost and design time trade-offs that the architectures offers matches the design's requirement. While both the dedicated hardware architectures and the software architectures (programmable CPU based) have a long history of research and exploration, it is comparatively more recently that one has started seeing the trend of leveraging the best features of both these kinds of architectures via designing new programmable architectures, namely the Application Specific Instruction Set Processor (ASIP) architectures. The idea of present paper is to discuss the comparative benefits and limitations of both the dedicated hardware architectures and the software based general purpose architectures and identify how the benefit of these architectures can be realized through a single architecture-the ASIP architecture.