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Deriving deadline and period for update transactions has long been recognized as an important problem in real-time database research. Despite years of active study, the state of the art only focuses on scheduling of update or control transaction separately. In this paper, we study the problem of deriving deadlines for update transactions in co-scheduling environment upon uniprocessor platforms. We...
Smart grids (SG) are essential for efficient management and monitoring of electric power networks. One of the most important tasks in SG focuses on fault detection and automatic network reconfiguration. This process allows minimizing power losses and load balancing in distribution networks. In this paper, an adaptation of the open shortest path first (OSPF) routing protocol to accomplish the network...
Commercial cloud systems allow massively parallel execution of a computing task for little money. We want to exploit this economic opportunity by solving classical problems in Operations Research through complete enumeration, especially if these problems can be expressed as integer programming problems. We propose and evaluate here a data structure, Scalable Virtual Distributed Hashing, that autonomously...
Software Defined Networking (SDN) is attracting many researchers in networking area, especially in the field of network operations and managements. A fine-grained network management that controls traffic dynamically by the unit of flows is one of the key challenges towards a resilient network for the future Internet. To this end, the network is required to re-configure timely, adaptively and dynamically...
Most of query optimizers choose a single query plan for processing all the data based on the average data statistics. But this plan is usually not efficient with the uncertain stream datasets of modern applications as network monitoring, sensor networks and financial applications; where these data have continuous variations over time. In this paper we propose an optimized query mesh for data stream...
Trace-oriented runtime monitoring is a very effective method to improve the reliability of distributed systems. However, for medium-scale distributed systems, existing traceoriented monitoring frameworks are either not powerful or efficient enough, or too complex and expensive to deploy and maintain. In this paper, we present MTracer, which is a lightweight trace-oriented monitoring system for mediumscale...
A Virtual Electronic Patient Record (VEPR) has been deployed at Hospital de S. João since 2005 that retrieves and integrates clinical record data. One of its modules is a MultiAgent system for Integration of Data (MAID) that provides automatic report retrieval from departmental systems. The currently deployed MAID uses a static interval for the scheduling of report references retrieval actions. As...
The future success of the Smart Grid (SG) depends on many technological developments and innovations being created. The SG will be characterized by decentralized generation, improved network communications, demand response, greater reliability and robustness to failures. The future power grid will also have many interacting components needing greater capabilities to coordinate and manage power and...
The emerging computational grid infrastructure consists of widely distributed heterogeneous resources, which makes mapping of increasingly complex applications a very challenging task. Utility Management Systems (UMS) manage large number of workflows with high resource requirements and thereby optimization of resource utilization has to be adapted. In this work we propose the architecture that implements...
With the extensive applications of FFT in digital signal processing and image signal processing which needs a extensive application of large-scale computing, it Become more and more important to improve parallelism, Efficient and Scalable parallel of FFT algorithm. This paper Improve the parallelism of the FFT algorithm based on the Six-Step FFT algorithm, And build up a framework Based on Grid, Through...
The emerging computational grid infrastructure consists of heterogeneous resources in widely distributed autonomous domains, which makes job scheduling very challenging. Although there is much work on static scheduling approaches for workflow applications in parallel environments, little work has been done on a real-world Grid environment for industrial systems. Utility Management Systems (UMS) are...
The evolution of computer is started from human dependent to self-management. With the development of technology, people want to manage the complex systems in an efficient and reliable manner. Database Management Systems (DBMSs) started from the single user with limited operations; and with the passage of time more functionality is added to meet the need of the users. Maximum number of operations,...
Google-Wide Profiling (GWP), a continuous profiling infrastructure for data centers, provides performance insights for cloud applications. With negligible overhead, GWP provides stable, accurate profiles and a datacenter-scale tool for traditional performance analyses. Furthermore, GWP introduces novel applications of its profiles, such as application-platform affinity measurements and identification...
The problem of resource service optimal-selection and composition (RSOSC) in manufacturing grid (MGrid) system is proposed. Based on the authors' previous work, a framework for addressing RSOSC problem in MGrid system is presented. The framework consists of five layers: (1) task layer-responsible for MGrid task decomposition, (2) resource service match and search layer-responsible for searching the...
Robust beat detection under noisy conditions is required in order to obtain a correct clinical interpretation of the ECG in ambulatory settings. This paper describes the evaluation and optimization of a beat detection algorithm that is robust against high levels of noise. An evaluation protocol is defined in order to study four different characteristics of the algorithm: non-rhythmic patterns, different...
This paper analyzes the disadvantages of current popular database connection pooling technologies according to the special requirements of NMVS (Non Motor-Vehicle System) system and puts forward a new proposal of self-adaptive database connection pooling. This new proposal can dynamically adjust XML configuration parameters based on application scope of NMVS, and then select the corresponding management...
In a resource-limited wireless communication environment, various approaches to meet the ever growing application requirements in an efficient and transparent manner, are being researched and developed. Amongst many approaches, cross layer technique is by far one of the significant contributions that has undoubtedly revolutionized the way conventional layered architecture is perceived. In this paper,...
Databases are growing rapidly in scale and complexity. High performance, availability and further policy goals need to be satisfied under any circumstances to please customers. In order to tune the DBMS within their complex environments highly skilled database administrators are required. Unfortunately, they are becoming rarer and more and more expensive. Hence, improving performance analysis and...
Replication in grid file systems can significantly improve I/O performance of data-intensive grid applications, but its manual creation and placement would be impractical in a real grid environment involving thousands to millions of files accessed per application. Although automatic determination of where and how many replicas should be created should be decided with regards to application access...
Multi-core SoC created great opportunities to increase overall system performance while keeping the power in check but also created many design challenges that designers must now overcome. The challenge of doubling performance every two years used to drive superscalar design with more functional units running concurrently or deeper pipeline racing for highest frequency at the cost of higher power...
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