The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
The quality of service multicast routing problem (QoSMRP) is a very interesting research issue for transmission in communication networks. It is known to be an NP-hard problem, so many heuristic algorithms have been employed for solving this problem. This paper proposes two hybrid approaches based on the hybridization of Firefly algorithm (FA) with Quantum Evolutionary algorithm (QEA) to solve the...
Cognitive radio (CR) is the current growing technology in wireless communication field and has increase the ability to use the frequency spectrum more properly. The main objective of cognitive radios is to sense the surrounding and use primary user's vacant spaces and allot them to the secondary users without interference each other. This paper presents the optimal solution and optimizes the Quality...
Future wireless systems must be designed to meet high data rates and a variety of services such as voice, video, etc. which consume more energy. Therefore, designing energy-efficient systems in recent years has become an inevitable trend. In this paper energy efficient resource allocation in orthogonal frequency division multiple access (OFDMA) systems is discussed. After formulating the resource...
In order to improve the efficiency of web service composition based on traditional heuristic algorithm, this paper focuses on the web service composition method by merging genetic algorithm(GA) and ant colony algorithm(ACA). Firstly, this paper transforms web service composition into finding a QoS global optimal path, then obtains the initial pheromone distribution of ACA by running GA, finally works...
Web service selection is a key step to construct a Web service composition system. For each system function, a suitable Web service must be selected from many candidate component services, respectively. However, when there exist complex dependency relationships between component services, it is difficult to make global service selections without any selection conflict. Therefore, we present a conflict-free...
Quality of Service Multicast routing has been classified as an NP-Complete problem. As a consequence, multiple bio-inspired models have been implemented to solve it. Before implementing the bio-inspired models is necessary to select and encoding system. It denotes the way of representing the problem such that the bio-inspired models understand it and can be used to solve it. In this work we present...
With the development of web service technology, it is necessary to combine the existing web service to complete the complex functions. With the increasing of web service's quantity, users are not only satisfied to get web service combination, but also have certain requirements of the service quality, and want to get better quality or the best service combination. This paper uses genetic algorithm...
After analyzing the essence of service selection, an optimum service selection genetic algorithm with multi-objective constraints is proposed. The algorithm includes a matrix-coding scheme of chromosomes that expresses the relationship between service providers, services and end-users. Special crossover and mutation operations based on matrix-coding are constructed, and both operations can ensure...
The QoS based route optimization is a key issue of the wireless network, which is a NPC-hard multi-objective discrete optimization problem. In this paper, an efficient multi-objective artificial bee colony optimization algorithm based on Pareto dominance called MOABC is proposed to tackle this problem. The algorithm was evaluated on a set of different scale test problems and compared with GA based...
Now-a-days the Most of the Computer systems work in a network and the routing of the packets efficiently and pace fully is required to maintain the performance of the system. The performance of the system may vary from user to user as simple routing can work for simple transferring but as the new era techniques of come into existence new parameters came into existence like the bandwidth requirement...
Software as a Service (SaaS) is a software delivery model for application vendors to serve large amount of users with customized services. To meet the different non-functional requirements of different users, multi-tenant SaaS applications must support different QoS level of different tenants. To ensure QoS level while maintaining high resource utilizing efficiency, this paper proposes a user requirement...
Service-Oriented Architecture enables the composition of loosely coupled services provided with varying Quality of Service (QoS) levels. Given a composition, finding the set of services that optimizes some QoS attributes under given QoS constraints has been shown to be NP-hard. Therefore, heuristic algorithms are widely used, finding acceptable solutions in polynomial time. Still the time complexity...
OSPF is one of the routing protocols which is the most widely used in internet and intranet today. The link-state algorithm in OSPF is based on the thought of local optimization, but in certain cases, routing algorithms based on local optimization might lead to a disadvantage which will remarkably depress global performances. A self-adaptive method based on the genetic algorithm is proposed, which...
An adaptive Genetic Algorithm is presented to select optimal web service composite plan from a lot of composite plans on the basis of global Quality-of-Service (QoS) constraints. In this Genetic Algorithm, a population diversity measurement and an adaptive crossover strategy are proposed to further improve the efficiency and convergence of Genetic Algorithm. The probability value of the crossover...
The problem of Web services selection based on quality of service (QoS) hasn't be essentially solved by the single objective optimal algorithm which optimizes service selection by aggregating multiple QoS parameters to form a composite objective function using weighted scoring method. This paper presents a Web services selection algorithm of QoS-aware and global multi-objective optimization, termed...
Grid provides efficient environment to execute application faster, with desired Quality of Service (QoS) constraints. Performance of grid (mainly time to execute applications) is dependent on the job scheduling strategy used to map applications or the job (collection of atomic tasks) grid resources. Grid Scheduling Algorithms (GSA) generates schedule of jobs and the corresponding resource which satisfy...
In this paper, an improved genetic algorithm to solve the unicast routing problem with QoS restrictions is proposed. The proposed algorithm uses real-coded strategy, which has unique crossover strategy, mutation strategy and fitness function, and in addition, the strategy of introducing alien species is adopted in the algorithm, in order to enhance the algorithm's global search ability. The simulation...
In the data grid environment, when users access to files, how to select the best site to obtain files from multiple replicas and reach the highest QOS (quality of service) in the cost of same price is a problem that need to be studied urgently, that is replica selection. In this paper, it proposes a new combination algorithm based on genetic algorithm and ant algorithm, which not only solves the inefficient...
This paper presents a new QoS multicast routing algorithm TPMA for MPLS-TE. The algorithm first modifies the evolution equation to improve standard PSO, and then utilizes TS technique to realize the balance of global and local search, further combines Fitness function to enhanced the global search ability, simultaneously considers other QoS parameters. The main objective of TPMA is to build a QoS...
Web service is an application program, which is based on internet, distributed, self-included, self-described and modular. It possesses the attributes of well encapsulation and loose coupling. With the prevailing of Web service, how to select a set of services among large body of services with the same function in order to make the Composite Web Service achieve better performance and better quality...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.