Development and Testing of a Real-time Lowcost PPP and MEMS INS Loosely Coupled Georeferencing System for Small UAVs under Challenging Environments

2019 ◽  
Author(s):  
Zhitao Lyu ◽  
Yang Jiang ◽  
Wei Ding ◽  
Yang Gao
Keyword(s):  
Real Time ◽  
Loosely Coupled

Service Discovery Framework for Distributed Embedded Real-Time Systems

2014 ◽  
pp. 126-147 ◽  
Author(s):  
Furkh Zeshan ◽  
Radziah Mohamad ◽  
Mohammad Nazir Ahmad
Keyword(s):  
Web Services ◽  
Real Time ◽  
Context Awareness ◽  
Service Discovery ◽  
Low Cost ◽  
High Volume ◽  
Heterogeneous Environments ◽  
Real Time Systems ◽  
Loosely Coupled ◽  
Time Systems

Embedded systems are supporting the trend of moving away from centralised, high-cost products towards low-cost and high-volume products; yet, the non-functional constraints and the device heterogeneity can lead to system complexity. In this regard, Service-Oriented Architecture (SOA) is the best methodology for developing a loosely coupled, dynamic, flexible, distributed, and cost-effective application. SOA relies heavily on services, and the Semantic Web, as the advanced form of the Web, handles the application complexity and heterogeneity with the help of ontology. With an ever-increasing number of similar Web services in UDDI, a functional description of Web services is not sufficient for the discovery process. It is also difficult to rank the similar services based on their functionality. Therefore, the Quality of Service (QoS) description of Web services plays an important role in ranking services within many similar functional services. Context-awareness has been widely studied in embedded and real-time systems and can also play an important role in service ranking as an additional set of criteria. In addition, it can enhance human-computer interaction with the help of ontologies in distributed and heterogeneous environments. In order to address the issues involved in ranking similar services based on the QoS and context-awareness, the authors propose a service discovery framework for distributed embedded real-time systems in this chapter. The proposed framework considers user priorities, QoS, and the context-awareness to enable the user to select the best service among many functional similar services.

scholarly journals A real-time virtual machine for task placement in loosely-coupled computer systems

Heliyon ◽  
2019 ◽  
Vol 5 (6) ◽  
pp. e01998 ◽  
Author(s):  
Mohamed O. Elsedfy ◽  
Wael A. Murtada ◽  
Ezz F. Abdulqawi ◽  
Mahmoud Gad-Allah
Keyword(s):  
Real Time ◽  
Virtual Machine ◽  
Computer Systems ◽  
Loosely Coupled ◽  
Task Placement

Reliable Robot Communication on Web Services

2006 ◽  
Vol 18 (1) ◽  
pp. 36-43 ◽  
Author(s):  
Masahiko Narita ◽  
◽  
Makiko Shimamura ◽  
Makoto Oya ◽  
Keyword(s):  
Web Services ◽  
Real Time ◽  
Transport Layer ◽  
Application Layer ◽  
Public Network ◽  
Loosely Coupled ◽  
Standardized Protocol ◽  
Mission Critical ◽  
Control Study ◽  
Robot Communication

Remote-robot-control study and standardization have mainly focused on real-time mission-critical communication. As robot technology expands in non-industrial areas such as entertainment and home use, a more flexible communication is required to realize communication between robots and between robots and computers in open/public network space, which need not be real-time or mission-critical. The RoboLink Protocol, developed as a standardized protocol for such communication, is based on Web services technology to ensure flexibility. We discuss requirements for robot communication reliability, an important practical issue, especially in loosely coupled environments, wireless networks, and WANs. To ensure reliability, we propose combining two solutions: one for the transport layer using standard messaging technology and the other for the application layer implementing transaction behavior with recovery for fatal failures. We provide a guideline for developers on how to implement recovery easily in their applications. We confirmed the feasibility of our proposal using sample implementation developed as a plug-in handler for the Web server.

Power Control Based on Pub/Sub for DFIG Wind Farm

2011 ◽  
Vol 343-344 ◽  
pp. 33-37
Author(s):  
Ling Ling Qiao ◽  
Zhi Gang Tian
Keyword(s):  
Power Control ◽  
Real Time ◽  
Wind Farm ◽  
Wind Farms ◽  
Real Time Control ◽  
Control Loops ◽  
Loosely Coupled ◽  
Time Control ◽  
Large Wind

Power control in large wind farm has a big impact on the Grid, especially in low connectivity ratio. Publish subscribe technology is asynchronous loosely coupled, and multi-to-multipoint communication as adapted for large distributed real-time control of network communications needs in the wind farm. This paper presents publish subscribe-based real-time power command-delivery method. It is well used to deliver the control of wind farm, reducing the time-delay in control loops. Simulation results show that the method further improves the quality of the power control of common coupling in large wind farms.

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