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CIRCA: a cooperative intelligent real-time control architecture

D.J. Musliner, E.H. Durfee, K.G. Shin
1993 IEEE Transactions on Systems, Man and Cybernetics  
Most research into applying AI techniques to real-time control problems has limited the power of AI methods or embedded \reactivity" in an AI system.  ...  With its abilities to guarantee or trade o the timeliness, precision, con dence, and completeness of its output, CIRCA provides more exible performance than previous systems.  ...  characteristics to deal with control-level problems that require guaranteed response times.  ... 
doi:10.1109/21.257754 fatcat:rw74bhspmbcczaeqh2t3jjamri

Programmable temporal isolation in real-time and embedded execution environments

Silviu S. Craciunas, Christoph M. Kirsch, Hannes Payer, Harald Röck, Ana Sokolova
2009 Proceedings of the Second Workshop on Isolation and Integration in Embedded Systems - IIES '09  
We begin this paper with a wish list of features that we feel a modern real-time and embedded execution environment should offer.  ...  We then look at some of the key weaknesses of conventional real-time operating systems (RTOS) and limitations of virtual execution environments (VEE), which typically offer some of the features but not  ...  with real time.  ... 
doi:10.1145/1519130.1519134 fatcat:xhpqixxgorh2zgjosauusiq2ky

Issues in building dynamic real-time systems

S. Natarajan, W. Zhao
1992 IEEE Software  
You can then guarantee that an application's requirements will be satisfied with a given time. The stage at whch you can predict and guarantee distinguishes static and dynam-ic real-time systems.  ...  In "resources," we include hardware @e processors), software (like servers), and data (like input). Recent research has focused on achieving timing correctness through predictability and guarantees.  ...  You can then guarantee that an application's requirements will be satisfied with a given time. The stage at whch you can predict and guarantee distinguishes static and dynam-ic real-time systems.  ... 
doi:10.1109/52.156893 fatcat:ifk6ciar55enlcztyuytuplm6q

eQoS: Provisioning of Client-Perceived End-to-End QoS Guarantees in Web Servers

Jianbin Wei, Cheng-Zhong Xu
2006 IEEE transactions on computers  
web servers is feasible and the eQoS is effective in such provisioning: The average deviation from a target response time 5 seconds with respect to whole web pages is only 1 second.  ...  It is important to guarantee client-perceived end-toend quality of service (QoS). Existing work, however, are limited to either server-side or network-side delays only.  ...  To provide such QoS guarantees, service quality must accurately measured in real time so that server resources can be allocated promptly.  ... 
doi:10.1109/tc.2006.197 fatcat:czzk6ovqtnhwpeifqpa45shlgy

Planning and resource allocation for hard real-time, fault-tolerant plan execution

Ella M. Atkins, Tarek F. Abdelzaher, Kang G. Shin, Edmund H. Durfee
1999 Proceedings of the third annual conference on Autonomous Agents - AGENTS '99  
We describe the interface between a real-time resource allocation system with an AI planner in order to create fault-tolerant plans that are guaranteed to execute in hard real-time.  ...  We situate this work in the context of CIRCA, the Cooperative Intelligent Real-time Control Architecture, which f o c u s e s o n d e v eloping and scheduling plans that make hard real-time safety guarantees  ...  Related Work The phrase \real-time" is not new to the planning community, but few architectures guarantee high quality, hard real-time response.  ... 
doi:10.1145/301136.301204 dblp:conf/agents/AtkinsASD99 fatcat:uw4erbjenfeuzmxa3mn4vx5bie

Real-time computing: a new discipline of computer science and engineering

K.G. Shin, P. Ramanathan
1994 Proceedings of the IEEE  
This paper surveys the state of the art in real-time computing. It introduces basic concepts and identifies key issues in the design of real-time systems.  ...  characteristics to deal with control-level problems that require guaranteed response times.  ...  CIRCA [60] was designed to meet these demands by guaranteeing that it will produce a precise, high-confidence response in a timely fashion to a limited set of inputs.  ... 
doi:10.1109/5.259423 fatcat:r6n5b64xqvg7ln2hc4aqupykwy

The Spring kernel: a new paradigm for real-time operating systems

J. A. Stankovic, K. Ramamritham
1989 ACM SIGOPS Operating Systems Review  
for on-line dynamic guarantees of deadlines.  ...  Next generation real-time systems will require greater flexibility and predictability than is commonly found in today's systems.  ...  Fairness and minimizing average response time are not important in a real-time system.  ... 
doi:10.1145/71021.71024 fatcat:vgua2mrtlvfr7osw2icyfoscta

DROPS

Hermann Härtig, Robert Baumgartl, Martin Borriss, Claude-Joachim Hamann, Micheal Hohmuth, Frank Mehnert, Lars Reuther, Sebastian Schönberg, Jean Wolter
1998 Proceedings of the 8th ACM SIGOPS European workshop on Support for composing distributed applications - EW 8  
It allows the coexistence of timesharing applications (with no reservations) and real-time applications (with reservations).  ...  DROPS (Dresden Real-time OPerating System) is being built to remedy that situation by providing resource managers that allow the reservation of resources in advance and enforce that reservations.  ...  A process exceeding its guaranteed CPU time is to be notified. Within the limits of their reserved cycles events needing higher responsiveness need to have priority over other processes.  ... 
doi:10.1145/319195.319226 dblp:conf/sigopsE/HartigBBHHMRSW98 fatcat:72lbf7xpmzhgpo75w75qtac53u

Selecting a Scheduling Policy for Embedded Real-Time Monitor and Control Systems [chapter]

Qingxu Deng, Mingsong Lv, Ge Yu
2005 Lecture Notes in Computer Science  
An integrated solution to guarantee real-time requirements in embedded real-time monitor and control systems is presented in this paper.  ...  First a typical task model is abstracted from such a control system, together with specific characteristics of the tasks.  ...  In conclusion, the RM algorithm guarantees that all hard real-time tasks meet their deadlines and the Sporadic Server algorithm can provide the shortest response time for soft real-time tasks.  ... 
doi:10.1007/11535409_72 fatcat:chhl2rdg2ffkzgava4ehilthia

World modeling for the dynamic construction of real-time control plans

David J. Musliner, Edmund H. Durfee, Kang G. Shin
1995 Artificial Intelligence  
CIRCA's world model provides the information required to make real-time performance guarantees, but avoids unnecessary complexity. * Corresponding author. Fax: (612) 951-7438.  ...  Building an agent that can flexibly achieve its goals in changing environments requires a blending of real-time computing and AI technologies, The Cooperative Intelligent Real-time Control Architecture  ...  CIRCA's second way of dealing with resource limitations is to gracefully degrade its guarantees.  ... 
doi:10.1016/0004-3702(94)00008-o fatcat:jxd4mzr6jney5hryfmcdzzqsxy

'QoS Safe' kernel extensions for real-time resource management

R. West, J. Gloudon
2002 Proceedings 14th Euromicro Conference on Real-Time Systems. Euromicro RTS 2002  
General-purpose operating systems are ill-equipped to meet the quality of service (QoS) requirements of complex real-time applications.  ...  We introduce the notion of 'QoS safety', which is concerned with meeting the QoS constraints of applications while maintaining system integrity.  ...  Furthermore, our approach supports extensions that monitor and adapt resource usage, to guarantee or improve QoS for real-time applications.  ... 
doi:10.1109/emrts.2002.1019188 dblp:conf/ecrts/WestG02 fatcat:wusf3guq3vff3k77raeqfelhvm

Imposing Real-Time Constraints on Self-Adaptive Controller Synthesis [chapter]

David J. Musliner
2000 Lecture Notes in Computer Science  
, self-adaptive system responding in real-time to perceived changes.  ...  the SA-CIRCA architecture for intelligent autonomous systems can automatically synthesize customized control software on the y, a n d h o w that synthesis process itself can be managed to conform to real-time  ...  Summary and Future Directions The ability t o m a k e performance tradeo s in the face of resource limitations is a fundamental requirement for intelligent real-time systems, since the very nature of real-time  ... 
doi:10.1007/3-540-44584-6_12 fatcat:iq36l5xgqfcjznaw3fafrpg6va

New Trends in Real Time Operating Systems

Vijaybhai Parmar
2017 International Journal for Research in Applied Science and Engineering Technology  
Still timely responses to events have to be provided within precise timing constraints in order to guarantee a desired level of performance.  ...  Guaranteeing timing behaviour requires that the system be predictable. Most real -time systems interface with and control hardware directly. The software for such systems is mostly custom developed.  ...  Still timely responses to events have to be provided within precise timing constraints in order to guarantee a desired level of performance.  ... 
doi:10.22214/ijraset.2017.9033 fatcat:wyclcrtpkfaonbklarliad7d2m

New Trends in Real Time Operating Systems

Ms. Shraddha S. Nakate
2012 IOSR Journal of Engineering  
Still timely responses to events have to be provided within precise timing constraints in order to guarantee a desired level of performance.  ...  Hence, embedded systems are, by nature, inherently real-time.  ...  Still timely responses to events have to be provided within precise timing constraints in order to guarantee a desired level of performance.  ... 
doi:10.9790/3021-0204883892 fatcat:33y4ita445aftnzd4kcjohv5du

n-Dimensional QoS Framework for Real-Time Service-Oriented Architectures

David Wesley McKee, Stephen Clement, Jie Xu, Dave Battersby
2017 2017 IEEE International Conference on Internet of Things (iThings) and IEEE Green Computing and Communications (GreenCom) and IEEE Cyber, Physical and Social Computing (CPSCom) and IEEE Smart Data (SmartData)  
Real-Time Systems Scheduling In order to guarantee the timely delivery of service, the appropriate formalisms from real-time systems research in real-time systems worst-case response times can be computed  ...  If the service description specifies a response-time that could only achieved under certain circumstances a late timing fault can occur due to resource limitations.  ... 
doi:10.1109/ithings-greencom-cpscom-smartdata.2017.34 dblp:conf/ithings/McKeeCXB17 fatcat:67rnoqj7sfftzitwt7prx33ofa
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