scholarly journals Spare CASH: Reclaiming Holes to Minimize Aperiodic Response Times in a Firm Real-Time Environment

2006 ◽  
Author(s):  
D.C. Thomas ◽  
S. Gopalakrishnan ◽  
M. Caccamo ◽  
Chang-Gun Lee
Keyword(s):  
Real Time ◽  
Response Times

Timely Autonomic Adaptation of Publish/Subscribe Middleware in Dynamic Environments

2011 ◽  
Vol 2 (4) ◽  
pp. 1-24 ◽  
Author(s):  
Joe Hoffert ◽  
Aniruddha Gokhale ◽  
Douglas C. Schmidt
Keyword(s):  
Quality Of Service ◽  
Embedded Systems ◽  
Real Time ◽  
Data Dissemination ◽  
Response Times ◽  
Dynamic Environments ◽  
Power Grids ◽  
Disaster Relief Operations ◽  
Relief Operations

Quality-of-service enabled publish/subscribe (pub/sub) middleware provides powerful support for scalable data dissemination. It is difficult to maintain key quality of service properties (such as reliability and latency) in dynamic environments for distributed real-time and embedded systems (such as disaster relief operations or power grids). Managing quality of service manually is often not feasible in dynamic environments due to slow response times, the complexity of managing multiple interrelated quality of service settings, and the scale of the systems being managed. For certain domains, distributed real-time and embedded systems must be able to reflect on the conditions of their environment and adapt accordingly in a bounded amount of time. This paper describes an architecture of quality of service-enabled middleware and corresponding algorithms to support specified quality of service in dynamic environments.

Best-Case Response Times and Jitter Analysis of Real-Time Tasks

2004 ◽  
Vol 7 (2) ◽  
pp. 133-147 ◽  
Author(s):  
Reinder J. Bril ◽  
Elisabeth F.M. Steffens ◽  
Wim F.J. Verhaegh
Keyword(s):  
Real Time ◽  
Response Times ◽  
Case Response

scholarly journals Novel Instrumentation for Real-Time Monitoring Using Miniaturized Flow Systems with Integrated Biosensors

1997 ◽  
Vol 34 (3) ◽  
pp. 291-302 ◽  
Author(s):  
R Freaney ◽  
A McShane ◽  
T V Keaveny ◽  
M McKenna ◽  
K Rabenstein ◽  
...  
Keyword(s):  
Real Time ◽  
Response Times ◽  
Computer Software ◽  
Dead Volume ◽  
System Response ◽  
Small Scale ◽  
Biosensor Array ◽  
In Vivo Testing ◽  
On Line

A prototype miniaturized Total Chemical Analysis System (μTAS) has been developed and applied to on-line monitoring of glucose and lactate in the core blood of anaesthetized dogs. The system consists of a highly efficient microdialysis sampling interface sited in a small-scale extracorporeal shunt circuit (‘MiniShunt’), a silicon machined microflow manifold and integrated biosensor array for glucose and lactate detection with associated computer software for analytical process control. During in-vivo testing the device allowed real-time on-screen monitoring of glucose and lactate with system response times of less than 5 min, made possible by the small dead volume of the microflow system. On-line glucose and lactate measurements were made in the basal state as well as during intravenous infusion of glucose or lactate. The prototype μTAS is currently suitable for trend monitoring but refinements are necessary before application of the system for determination of individual lactate values.

scholarly journals Hierarchical Scheduling for Real-Time Periodic Tasks in Symmetric Multiprocessing

2021 ◽  
Author(s):  
Tom Springer ◽  
Peiyi Zhao
Keyword(s):  
Real Time ◽  
Response Times ◽  
Periodic Tasks ◽  
Global Scheduling ◽  
Hierarchical Scheduling ◽  
Time Performance ◽  
Performance Guarantees ◽  
Partitioned Scheduling ◽  
Hard Real Time ◽  
Time Periodic

In this paper, we present a new hierarchical scheduling framework for periodic tasks in symmetric multiprocessor (SMP) platforms. Partitioned and global scheduling are the two main approaches used by SMP based systems where global scheduling is recommended for overall performance and partitioned scheduling is recommended for hard real-time performance. Our approach combines both the global and partitioned approaches of traditional SMP-based schedulers to provide hard real-time performance guarantees for critical tasks and improved response times for soft real-time tasks. Implemented as part of VxWorks, the results are confirmed using a real-time benchmark application, where response times were improved for soft real-time tasks while still providing hard real-time performance.

scholarly journals Hydrogel-coating improves the in-vivo stability of electrochemical aptamer-based biosensors

2020 ◽  
Author(s):  
Shaoguang Li ◽  
Jun Dai ◽  
Man Zhu ◽  
Netzahualcóyotl Arroyo-Currás ◽  
Hongxing Li ◽  
...  
Keyword(s):  
Real Time ◽  
Response Times ◽  
Protective Layer ◽  
Drift Correction ◽  
Living Body ◽  
Agarose Hydrogel ◽  
Improved Stability ◽  
Varying Environments

AbstractThe ability to track the levels of specific molecules, such as drugs, metabolites, and biomarkers, in the living body, in real time and for long durations would improve our understanding of health and our ability to diagnose, treat and monitor disease. To this end, we are developing electrochemical aptamer-based (E-AB) biosensors, a general platform supporting high-frequency, real-time molecular measurements in the living body. Here we report that the addition of an agarose hydrogel protective layer to E-AB sensors significantly improves their baseline stability when deployed in the complex, highly time-varying environments found in vivo. The improved stability is sufficient that these hydrogel-protected sensors achieved good baseline stability when deployed in situ in the veins, muscles, bladder, or tumors of living rats without the use of the drift correction approaches traditionally required in such placements. Finally, this improved stability is achieved without any significant, associated “costs” in terms of detection limits, response times, or biocompatibility.

scholarly journals Blockchain-enabled real-time SLA monitoring for cloud-hosted services

2021 ◽  
Author(s):  
Kashif Mehboob Khan ◽  
Junaid Arshad ◽  
Waheed Iqbal ◽  
Sidrah Abdullah ◽  
Hassan Zaib
Keyword(s):  
Cloud Computing ◽  
Real Time ◽  
Service Providers ◽  
Response Times ◽  
Cloud Service ◽  
Service Level ◽  
Cloud Services ◽  
Blockchain Technology ◽  
Manual Processing ◽  
And Performance

AbstractCloud computing is an important technology for businesses and individual users to obtain computing resources over the Internet on-demand and flexibly. Although cloud computing has been adopted across diverse applications, the owners of time-and-performance critical applications require cloud service providers’ guarantees about their services, such as availability and response times. Service Level Agreements (SLAs) are a mechanism to communicate and enforce such guarantees typically represented as service level objectives (SLOs), and financial penalties are imposed on SLO violations. Due to delays and inaccuracies caused by manual processing, an automatic method to periodically verify SLA terms in a transparent and trustworthy manner is fundamental to effective SLA monitoring, leading to the acceptance and credibility of such service to the customers of cloud services. This paper presents a blockchain-based distributed infrastructure that leverages fundamental blockchain properties to achieve immutable and trustworthy SLA monitoring within cloud services. The paper carries out an in-depth empirical investigation for the scalability of the proposed system in order to address the challenge of transparently enforcing real-time monitoring of cloud-hosted services leveraging blockchain technology. This will enable all the stakeholders to enforce accurate execution of SLA without any imprecisions and delays by maintaining an immutable ledger publicly across blockchain network. The experimentation takes into consideration several attributes of blockchain which are critical in achieving optimum performance. The paper also investigates key characteristics of these factors and their impact to the behaviour of the system for further scaling it up under various cases for increased service utilization.

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