Bi-Objective Competition Pricing Model for Component Web Service Economy

2021 ◽  
Vol 18 (2) ◽  
pp. 76-100
Author(s):  
Yu Wang ◽  
XiaoLin Li ◽  
HuaPing Chen
Keyword(s):  
Web Service ◽  
Service Providers ◽  
Service Networks ◽  
Composite Service ◽  
Proposed Model ◽  
Numerical Experimentation ◽  
Objective Model ◽  
Composite Services ◽  
The Individual ◽  
Individual Service

In the web service marketplace, component-based economy has been proposed for describing participants' behavioral patterns. Composite service networks combine multiple composite services required by various service consumers. With each composite service as a product, web services comprise heterogeneous products. In this study, the pricing behavior of networked individual service providers is investigated. With the objective of service survival or high profitability, service providers compete both on the single-service and service-network levels. Using examples, several mild assumptions are formulated and analyzed. Then, a bi-objective optimization model is proposed based on these assumptions, which attempts to maintain a reasonable effectiveness-fairness trade-off from the individual service providers' perspective. The NP-completeness of the single-objective version is demonstrated by transforming the problem into a subset sum problem, which highlights the challenge of obtaining a pareto set for the bi-objective model. Finally, to validate the proposed model, numerical experimentation and case study are conducted, and both the bi-objective and many-objective versions of the problem are discussed.

A Practical Approach to Enhancement of Accuracy of Similarity Model Using WordNet towards Semantic Service Discovery

2014 ◽  
pp. 245-265
Author(s):  
Chellammal Surianarayanan ◽  
Gopinath Ganapathy ◽  
Manikandan Sethunarayanan Ramasamy
Keyword(s):  
Web Service ◽  
Service Discovery ◽  
Service Providers ◽  
Computation Time ◽  
Proposed Model ◽  
Similarity Model ◽  
Domain Ontologies ◽  
Semantic Service ◽  
General Ontology ◽  
Semantic Web Service Discovery

Semantic Web service discovery provides high retrieval accuracy. However, it imposes an implicit constraint to service clients that the clients must express their queries with the same domain ontologies as used by the service providers. Fulfilling this criterion is very tedious. Hence, a WordNet (general ontology)-based similarity model is proposed for service discovery, and its accuracy is enhanced to a level comparable to the accuracy of computing similarity using service specific ontologies. This is done by optimizing similarity threshold, which refers to a minimum similarity that is required to decide whether a given pair of services is similar or not. The proposed model is implemented and results are presented. The approach warrants clients to express their queries without specifying any ontology and alleviates the problem of maintaining complex domain ontologies. Moreover, the computation time of WordNet-based model is very low when compared to specific ontology-based model.

scholarly journals Variations in seasonality in spa centres of Serbia

2021 ◽  
Vol 101 (1) ◽  
pp. 89-110
Author(s):  
Sanja Pavlovic ◽  
Nikola Todorovic ◽  
Jelena Bolovic ◽  
Marina Vesic
Keyword(s):  
Gini Index ◽  
Service Providers ◽  
Seasonal Fluctuation ◽  
Economic Effects ◽  
Tourism Destinations ◽  
Tourist Demand ◽  
The Individual ◽  
High Degree ◽  
Demand Seasonality ◽  
Individual Service

Seasonality of tourist demand imposes a number of issues related to the destination?s carrying capacity and business activities of the individual service providers in tourism. As one indicator of seasonal fluctuation of tourist demand, the Gini index is identified in order to establish monthly concentration of tourists. In this study, the Gini index was calculated for four spa tourism destinations in Serbia (Vrnjacka Banja, Sokobanja, Niska Banja, and Prolom Banja), in order to establish variability in the seasonality. The research took into consideration the period 2010-2019. Research results indicate that Niska Banja Spa has the lowest values of the Gini index, while Vrnjacka Banja Spa and Sokobanja Spa have the highest values, whereby no values are higher that .45 (mostly between .30 and .39). Given that the theoretically lowest value of the Gini index is 0 (smallest seasonal concentration) and the highest is 1 (biggest concentration), the selected spas still do not have particularly high degree of seasonal concentration of tourists. Possibilities for reduction of tourist demand seasonality are pointed out, given its impact on tourism planning and its economic effects.

A Pricing Model for Effective Radio Spectrum Utilization

2019 ◽  
Vol 10 (4) ◽  
pp. 41-65 ◽  
Author(s):  
Sunil Kumar Singh ◽  
Deo Prakash Vidyarthi
Keyword(s):  
Service Provider ◽  
Service Providers ◽  
Radio Spectrum ◽  
Mobile Users ◽  
Mobile Service ◽  
Spectrum Utilization ◽  
Service Pricing ◽  
Proposed Model ◽  
Utmost Care ◽  
The Individual

Mobile users expect uninterrupted radio services whether operating in a host network or a foreign network. To support this, the cooperation of various mobile service providers becomes very important as they can share their available but unused resources among the mobile users. It has become possible for the mobile users to churn and leave the current service provider, if not happy with the offered services. This, eventually, may affect the revenue severely of the individual service provider besides defaming it. This work proposes a model on service pricing based on service providers' cooperation that utilizes the channels effectively and minimizes the call block and call drop. A penalty, on the service provider, is incorporated in the pricing which encourages a service provider to give utmost care to its users. A simulation experiment was carried out to study the performance of the proposed model, indicating the effectiveness of the model.

Optimal Compensation for Hierarchical Web Services Compositions Under Restricted Visibility

2011 ◽  
Vol 3 (4) ◽  
pp. 22-38 ◽  
Author(s):  
Debmalya Biswas ◽  
Krishnamurthy Vidyasankar
Keyword(s):  
Fault Tolerance ◽  
Web Services ◽  
Web Service ◽  
Database Systems ◽  
Privacy And Security ◽  
Organizational Boundaries ◽  
Composite Service ◽  
Composite Services ◽  
Reliability And Robustness ◽  
Different Levels

Over the years, the notion of transactions has become synonymous with providing fault-tolerance, reliability and robustness to database systems. To extend the same transactional guarantees to new and evolving paradigms, such as Web service, the transactional mechanisms must first be adapted to the distinguishing characteristics of Web services, mainly composability, long-running nature, and privacy and security concerns. Composability refers to the ability to form new composite services by combining the functionalities of existing services. Due to their long-running nature, compensation based mechanisms are usually preferred to provide transactional guarantees for Web services. Compensation requires access (visibility) over the execution details of the services in the composition. However, such visibility may not always be feasible in a compositional context where component services are provided by different providers across organizational boundaries, with very strong privacy and security constraints. This paper looks at compensation options for Web services in a hierarchical composition. Multiple compensation options may be available for a composite service both at the same level and at different levels of the hierarchy. This paper shows how to find an optimal compensation option under restricted visibility.

A Dynamic Two-Phase Commit Protocol for Adaptive Composite Services

2011 ◽  
pp. 2465-2486
Author(s):  
Weihai Yu ◽  
Calton Pu
Keyword(s):  
Web Service ◽  
System Performance ◽  
Two Phase ◽  
Commit Protocols ◽  
Composite Web Service ◽  
Distributed Transaction ◽  
Composite Services ◽  
Adaptive Composite ◽  
Individual Service ◽  
Commit Protocol

Next-generation applications based on Web services impose additional requirements on the use of coordination protocols with various optimizations, such as the two-phase commit protocol (2PC). This article analyses the well-known 2PC optimizations “presumed commit” and “presumed abort,” and presents an improved 2PC that is suitable for Web-service-based applications. More specifically, the protocol allows every individual service provider to choose dynamically the most appropriate presumption for any distributed transaction. This new capability is especially useful when a composite Web service is integrating component services that make different presumptions in their commit protocols. The protocol does not introduce extra overhead to the previous 2PC variants in terms of number of messages and log records, and it is easy to understand and realize. Our simulation shows that the choice of appropriate presumption has significant influence on system performance, and that in some heterogeneous settings, combining different presumptions in individual transactions outperforms adopting only one single presumption.

Optimal Compensation for Hierarchical Web Services Compositions under Restricted Visibility

2013 ◽  
pp. 205-222
Author(s):  
Debmalya Biswas ◽  
Krishnamurthy Vidyasankar
Keyword(s):  
Fault Tolerance ◽  
Web Services ◽  
Web Service ◽  
Database Systems ◽  
Privacy And Security ◽  
Organizational Boundaries ◽  
Composite Service ◽  
Composite Services ◽  
Reliability And Robustness ◽  
Different Levels

Over the years, the notion of transactions has become synonymous with providing fault-tolerance, reliability and robustness to database systems. To extend the same transactional guarantees to new and evolving paradigms, such as Web service, the transactional mechanisms must first be adapted to the distinguishing characteristics of Web services, mainly composability, long-running nature, and privacy and security concerns. Composability refers to the ability to form new composite services by combining the functionalities of existing services. Due to their long-running nature, compensation based mechanisms are usually preferred to provide transactional guarantees for Web services. Compensation requires access (visibility) over the execution details of the services in the composition. However, such visibility may not always be feasible in a compositional context where component services are provided by different providers across organizational boundaries, with very strong privacy and security constraints. This paper looks at compensation options for Web services in a hierarchical composition. Multiple compensation options may be available for a composite service both at the same level and at different levels of the hierarchy. This paper shows how to find an optimal compensation option under restricted visibility.

scholarly journals Approaches to Web Service Composition for the Semantic Web

2021 ◽  
Vol 1 (3) ◽  
pp. 35-43
Author(s):  
Mohammed H. Ramadhan
Keyword(s):  
Web Services ◽  
Semantic Web ◽  
Web Service ◽  
Service Composition ◽  
Web Service Composition ◽  
Common Goal ◽  
Composite Service ◽  
Abstract Service ◽  
Web Contents ◽  
Individual Service

Abstract—Service composition is gaining popularity because a composite service can perform functions that an individual service cannot. There are multiple web services available on the web for different tasks. The semantic web is an advanced form of the current web in which all contents have well-defined meanings due to nature, allowing machines to process web contents automatically. A web service composition is a collection of web services that collaborate to achieve a common goal. They reveal the established methods for web service composition in both syntactic and semantic environments. In this study Initially, we identify the existing techniques used for the composition. We classified these approaches according to the processing of the service descriptions, which can be syntactic or semantic-based service processes. We have reviewed more than 14 articles in this domain and concluded the merits of the methodologies applied for the implementation of web service composition.

A New Model for Web Service Composition

2011 ◽  
Vol 219-220 ◽  
pp. 638-642
Author(s):  
Long Hao
Keyword(s):  
Web Service ◽  
Service Composition ◽  
Optimization Methods ◽  
Web Service Composition ◽  
New Model ◽  
Model Based ◽  
Multiple Input ◽  
Composite Services ◽  
Individual Service

To support automated Web service composition, it is compelling to provide a template, or model that dictates the ways in which services can be composed. In this paper, a novel composition model based on the relative vector is proposed, where individual services, composite services, and user objectives are described with the relative vectors, through a series of operators defined on the relative vector, available composite services can be found, and how much they meet user objectives can be evaluated. A significant advantage of our approach is that many existing optimization methods can be used to search optimized compositions, where parallel or choice structure is enabled, individual service with multiple input or output parameters is allowed.

A Circular Business Model for Cloud Computing Services Providers

10.31355/33 ◽  
2018 ◽  
Vol 2 ◽  
pp. 105-120
Author(s):  
Hamed Motaghi ◽  
Saeed Nosratabadi ◽  
Thabit Qasem Atobishi
Keyword(s):  
Cloud Computing ◽  
Business Model ◽  
Circular Economy ◽  
Service Providers ◽  
Sustainable Consumption ◽  
Future Research ◽  
Extensive Literature ◽  
Computing Services ◽  
Proposed Model ◽  
Cloud Computing Service

NOTE: THIS ARTICLE WAS PUBLISHED WITH THE INFORMING SCIENCE INSTITUTE. Aim/Purpose................................................................................................................................................................................................. The main objective of the current study is to develop a business model for service providers of cloud computing which is designed based on circular economy principles and can ensure the sustainable consumption. Background Even though the demand for cloud computing technology is increasing day by day in all over the world, the current the linear economy principles are incapable to ensure society development needs. To consider the benefit of the society and the vendors at the same time, the principles of circular economy can address this issue. Methodology................................................................................................................................................................................................. An extensive literature review on consumption, sustainable consumption, circular economic, business model, and cloud computing were conducted. the proposed model of Osterwalder, Pigneur and Tucci (2005) is admitted designing the circular business model. Contribution................................................................................................................................................................................................. The proposed model of the study is the contribution of this study where provides the guidelines for the cloud computing service providers to achieve both their economic profits and the society’ needs. Findings Finding reveals that if the cloud computing service providers design their business model based on the “access” principle of circular economy, they can meet their economic profits and the society’ needs at a same time. Recommendations for Practitioners.............................................................................................................................................................. It is recommended to the startup and the existing businesses to utilize the proposed model of this study to reach a sustainable development. Recommendation for Researchers................................................................................................................................................................ It proposes a new circular business model and its linkages with community building. Impact on Society............................................................................................................................................................................................ The proposed model of the study provides guidelines to the cloud computing service providers to design a business model which is able not only to meet their economic profit, but also to meet the society’s and customers’ benefits. Future Research............................................................................................................................................................................................... Future researches can build on this research model which proposed in this study to examine the limitations of this model by using empirical researches.

scholarly journals Economical Speed for Optimizing the Travel Time and Energy Consumption in Train Scheduling using a Fuzzy Multi-Objective Model

2021 ◽  
Author(s):  
Ahmad Reza Jafarian-Moghaddam
Keyword(s):  
Energy Consumption ◽  
Travel Time ◽  
Pollutant Emissions ◽  
Scheduling Problems ◽  
Train Scheduling ◽  
Multi Objective ◽  
Consumption Ratio ◽  
Proposed Model ◽  
Objective Model ◽  
Time And Energy

AbstractSpeed is one of the most influential variables in both energy consumption and train scheduling problems. Increasing speed guarantees punctuality, thereby improving railroad capacity and railway stakeholders’ satisfaction and revenues. However, a rise in speed leads to more energy consumption, costs, and thus, more pollutant emissions. Therefore, determining an economic speed, which requires a trade-off between the user’s expectations and the capabilities of the railway system in providing tractive forces to overcome the running resistance due to rail route and moving conditions, is a critical challenge in railway studies. This paper proposes a new fuzzy multi-objective model, which, by integrating micro and macro levels and determining the economical speed for trains in block sections, can optimize train travel time and energy consumption. Implementing the proposed model in a real case with different scenarios for train scheduling reveals that this model can enhance the total travel time by 19% without changing the energy consumption ratio. The proposed model has little need for input from experts’ opinions to determine the rates and parameters.

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