489 research outputs found
Data-centric communication framework for multicast iec 61850 routable GOOSE messages over the WAN in modern power systems
In this paper, a data-centric communication framework is proposed for multicast routable generic object-oriented substation event (GOOSE) messages (MRGM) over the wide area network (WAN) for effective substation-to-substation (SS2SS) and substation to control center (SS2CC) communications. In this structure, the IEC 61850 GOOSE message is transmitted over the WAN using the data distribution service (DDS) as a fast, reliable, and secure data-centric communication middleware. The main feature of this framework is its multicast capability, where several authorized subscribers can receive a published message simultaneously. This can significantly improve the system monitoring and control of the protection systems in modern smart grids, where intelligent schemes can be applied. The effectiveness of the proposed platform, in terms of total end-to-end delay between participants, is evaluated through experimental results obtained from the actual hardware-based test setup developed at the Florida International University (FIU) smart grid testbed. The results demonstrate that the latency between sending and receiving a GOOSE message among participants is within its maximum time span defined by the IEC 61850-90-5 working group for communications over the WAN
Deep Space Network information system architecture study
The purpose of this article is to describe an architecture for the Deep Space Network (DSN) information system in the years 2000-2010 and to provide guidelines for its evolution during the 1990s. The study scope is defined to be from the front-end areas at the antennas to the end users (spacecraft teams, principal investigators, archival storage systems, and non-NASA partners). The architectural vision provides guidance for major DSN implementation efforts during the next decade. A strong motivation for the study is an expected dramatic improvement in information-systems technologies, such as the following: computer processing, automation technology (including knowledge-based systems), networking and data transport, software and hardware engineering, and human-interface technology. The proposed Ground Information System has the following major features: unified architecture from the front-end area to the end user; open-systems standards to achieve interoperability; DSN production of level 0 data; delivery of level 0 data from the Deep Space Communications Complex, if desired; dedicated telemetry processors for each receiver; security against unauthorized access and errors; and highly automated monitor and control
Distributed control of reconfigurable mobile network agents for resource coordination
Includes abstract.Includes bibliographical references.Considering the tremendous growth of internet applications and network resource federation proposed towards future open access network (FOAN), the need to analyze the robustness of the classical signalling mechanisms across multiple network operators cannot be over-emphasized. It is envisaged, there will be additional challenges in meeting the bandwidth requirements and network management...The first objective of this project is to describe the networking environment based on the support for heterogeneity of network components..
Major requirements for building Smart Homes in Smart Cities based on Internet of Things technologies
The recent boom in the Internet of Things (IoT) will turn Smart Cities and Smart Homes (SH) from hype to reality. SH is the major building block for Smart Cities and have long been a dream for decades, hobbyists in the late 1970s made Home Automation (HA) possible when personal computers started invading home spaces. While SH can share most of the IoT technologies, there are unique characteristics that make SH special. From the result of a recent research survey on SH and IoT technologies, this paper defines the major requirements for building SH. Seven unique requirement recommendations are defined and classified according to the specific quality of the SH building blocks
Amphibious operation simulation.
Since the price of personal computers is coming down, it is
possible to have computers in a small ship that has a limited
budget. The commanding officer of a small ship needs a support
system for making decisions in amphibious operations. A personal
computer would be helpful in saving time manipulating the information
used to make decisions in amphibious operations.http://archive.org/details/amphibiousoperat00hongLieutenant, Royal Thai NavyApproved for public release; distribution is unlimited
Digital document imaging systems: An overview and guide
This is an aid to NASA managers in planning the selection of a Digital Document Imaging System (DDIS) as a possible solution for document information processing and storage. Intended to serve as a manager's guide, this document contains basic information on digital imaging systems, technology, equipment standards, issues of interoperability and interconnectivity, and issues related to selecting appropriate imaging equipment based upon well defined needs
A reference architecture for flexibly integrating machine vision within manufacturing
A reference architecture provides an overall framework that may embrace models, methodologies and
mechanisms which can support the lifecycle of their target domain. The work described in this thesis
makes a contribution to establishing such a generally applicable reference architecture for supporting
the lifecycIe of a new generation of integrated machine vision systems.
Contemporary machine vision systems consist of a complex combination of mechanical engineering,
the hardware and software of an electronic processor, plus optical, sensory and lighting components.
"This thesis is concerned with the structure of the software which characterises the system application.
The machine vision systems which are currently used within manufacturing industry are difficult to
integrate within the information systems required within modem manufacturing enterprises. They are
inflexible in all but the execution of a range of similar operations, and their design and implementation
is often such that they are difficult to update in the face of the required change inherent within modem
manufacturing.
The proposed reference architecture provides an overall framework within which a number of supporting
models, design methodologies, and implementation mechanisms can combine to provide support
for the rapid creation and maintenance of highly structured machine vision applications. These applications
comprise modules which can be considered as building blocks of CIM systems. Their integrated
interoperation can be enabled by the emerging infrastructural tools which will be required to underpin
the next generation of flexibly integrated manufacturing systems.
The work described in this thesis concludes that the issues of machine vision applications and the
issues of integration of these applications within manufacturing systems are entirely separate. This separation
is reflected in the structure of the thesis. PART B details vision application issues while PAIIT C
deals with integration. The criteria for next generation integrated machine vision systems, derived in
PART A of the thesis, are extensive. In order to address these criteria and propose a complete architecture,
a "thin slice" is taken through the areas of vision application, and integration at the lifecycle
stages of design, implementation, runtime and maintenance.
The thesis describes the reference architecture, demonstrates its use though a proof of concept implementation
and evaluates the support offered by the architecture for easing the problems of software change
Standards in Library Automation and Networking
The paper presented as a tutorial discusses the metadata and interoperability standards that a modern web-based library automation should be compliant with. It also emphasizes the need and reasons why Indian libraries should adopt such standards in their work and in planning and seeking both automation and networking solutions
Internet of Things-aided Smart Grid: Technologies, Architectures, Applications, Prototypes, and Future Research Directions
Traditional power grids are being transformed into Smart Grids (SGs) to
address the issues in existing power system due to uni-directional information
flow, energy wastage, growing energy demand, reliability and security. SGs
offer bi-directional energy flow between service providers and consumers,
involving power generation, transmission, distribution and utilization systems.
SGs employ various devices for the monitoring, analysis and control of the
grid, deployed at power plants, distribution centers and in consumers' premises
in a very large number. Hence, an SG requires connectivity, automation and the
tracking of such devices. This is achieved with the help of Internet of Things
(IoT). IoT helps SG systems to support various network functions throughout the
generation, transmission, distribution and consumption of energy by
incorporating IoT devices (such as sensors, actuators and smart meters), as
well as by providing the connectivity, automation and tracking for such
devices. In this paper, we provide a comprehensive survey on IoT-aided SG
systems, which includes the existing architectures, applications and prototypes
of IoT-aided SG systems. This survey also highlights the open issues,
challenges and future research directions for IoT-aided SG systems
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