Service composition in the multi cloud environment

2017 ◽  
Vol 13 (4) ◽  
pp. 471-484 ◽  
Author(s):  
Abdelbasset Barkat ◽  
Kazar Okba ◽  
Samir Bourekkache
Keyword(s):  
Service Composition ◽  
User Satisfaction ◽  
Design Methodology ◽  
Programming Model ◽  
Cloud Environment ◽  
Content Type ◽  
Water Drops ◽  
Multiple Services ◽  
Composition Process ◽  
Multi Cloud

Purpose User requests over the cloud are not achievable with one single service, multiple services need to be executed to fulfill what a user asks for. Typically, such services are composed and presented as one global service. Moreover, the same operation can be achieved by multiple services available at different clouds, which can result in different possibilities in composing them. This paper aims to decrease the number of clouds involved in the composition process, so that user requests are satisfied with minimal cost (communication costs, execution time and financial charges). Design/methodology/approach This paper investigates the use of an intelligent water drops (IWDs) optimization-based algorithm, and an integer linear programming model to optimize the number of cloud bases involved in the composition process. A comparison of the solutions found by these two techniques is presented in the paper. Findings The obtained results show that the number of cloud bases can be decreased without affecting user satisfaction. Originality/value The paper is a first attempt to use the IWDs algorithm for service composition, tested with big-size data.

scholarly journals Location of regional and international hub ports in liner shipping

2017 ◽  
Vol 2 (2) ◽  
pp. 114-125 ◽  
Author(s):  
Jianfeng Zheng ◽  
Cong Fu ◽  
Haibo Kuang
Keyword(s):  
Design Methodology ◽  
Location Problem ◽  
Programming Model ◽  
Liner Shipping ◽  
Mixed Integer ◽  
Eastern Asia ◽  
Hub Location ◽  
Hub Location Problem ◽  
Content Type ◽  
Western Asia

Purpose This paper aims to investigate the location of regional and international hub ports in liner shipping by proposing a hierarchical hub location problem. Design/methodology/approach This paper develops a mixed-integer linear programming model for the authors’ proposed problem. Numerical experiments based on a realistic Asia-Europe-Oceania liner shipping network are carried out to account for the effectiveness of this model. Findings The results show that one international hub port (i.e. Rotterdam) and one regional hub port (i.e. Zeebrugge) are opened in Europe. Two international hub ports (i.e. Sokhna and Salalah) are located in Western Asia, where no regional hub port is established. One international hub port (i.e. Colombo) and one regional hub port (i.e. Cochin) are opened in Southern Asia. One international hub port (i.e. Singapore) and one regional hub port (i.e. Jakarta) are opened in Southeastern Asia and Australia. Three international hub ports (i.e. Hong Kong, Shanghai and Yokohama) and two regional hub ports (i.e. Qingdao and Kwangyang) are opened in Eastern Asia. Originality/value This paper proposes a hierarchical hub location problem, in which the authors distinguish between regional and international hub ports in liner shipping. Moreover, scale economies in ship size are considered. Furthermore, the proposed problem introduces the main ports.

A privacy protection approach for XML-based archives management in a cloud environment

2019 ◽  
Vol 37 (6) ◽  
pp. 970-983 ◽  
Author(s):  
Zongda Wu ◽  
Jian Xie ◽  
Xinze Lian ◽  
Jun Pan
Keyword(s):  
Cloud Computing ◽  
Privacy Protection ◽  
Design Methodology ◽  
Digital Archive ◽  
Cloud Environment ◽  
System Availability ◽  
Encrypted Data ◽  
Content Type ◽  
Main Obstacle ◽  
Overall Performance

Purpose The security of archival privacy data in the cloud has become the main obstacle to the application of cloud computing in archives management. To this end, aiming at XML archives, this paper aims to present a privacy protection approach that can ensure the security of privacy data in the untrusted cloud, without compromising the system availability. Design/methodology/approach The basic idea of the approach is as follows. First, the privacy data before being submitted to the cloud should be strictly encrypted on a trusted client to ensure the security. Then, to query the encrypted data efficiently, the approach constructs some key feature data for the encrypted data, so that each XML query defined on the privacy data can be executed correctly in the cloud. Findings Finally, both theoretical analysis and experimental evaluation demonstrate the overall performance of the approach in terms of security, efficiency and accuracy. Originality/value This paper presents a valuable study attempting to protect privacy for the management of XML archives in a cloud environment, so it has a positive significance to promote the application of cloud computing in a digital archive system.

scholarly journals The unit train make-up scheme for loaded direction in the heavy haul railway

2019 ◽  
Vol 1 (1) ◽  
pp. 30-44 ◽  
Author(s):  
Yuqiang Wang ◽  
Yuguang Wei ◽  
Hua Shi ◽  
Xinyu Liu ◽  
Liyuan Feng ◽  
...  
Keyword(s):  
Integer Programming ◽  
Design Methodology ◽  
Arrival Time ◽  
Programming Model ◽  
Nonlinear Integer Programming ◽  
Content Type ◽  
Proposed Model ◽  
Heavy Haul ◽  
Heavy Haul Railway

Purpose The purpose of this paper is to study the unit train make-up scheme for loaded direction in the heavy haul railway. Design/methodology/approach A 0-1 nonlinear integer programming model with the aim of minimizing the idling period between actual train arrival time and expected train arrival time for all loaded unit trains are proposed. Findings The proposed model is applied into a case study based on Daqin heavy haul railway. Results show that the proposed model can offer operators an optimal unit train make-up scheme for loaded direction in heavy haul railway. Originality/value The proposed model can offer operators an optimal unit train make-up scheme for loaded direction in heavy haul railway.

Clear skies or cloudy forecast?

2014 ◽  
Vol 24 (1) ◽  
pp. 56-73 ◽  
Author(s):  
Elaine Goh
Keyword(s):  
North America ◽  
Design Methodology ◽  
Data Flow ◽  
Develop Model ◽  
Court Cases ◽  
Cloud Environment ◽  
Content Type ◽  
Maritime Law ◽  
The Pacific ◽  
Legal Risks

Purpose – Using the example of audiovisual materials, this paper aims to illustrate how records-related and archival legislation lags behind advances in technology. As more audiovisual materials are created on the cloud, questions arise about the applicability of national laws over the control, ownership, and custody of data and records. Design/methodology/approach – This paper analyses court cases relating to audiovisual materials in the cloud and archival legislation from three Commonwealth countries: Canada, Australia, and Singapore – representing North America, the Pacific, and Asia respectively. Findings – Current records-related and archival legislation does not effectively address the creation, processing, and preservation of records and data in a cloud environment. The paper identifies several records-related risks linked to the cloud – risks related to the ownership and custody of data, legal risks due to transborder data flow, and risks due to differing interpretations on the act of copying and ownership of audiovisual materials. Research limitations/implications – The paper identifies the need for records professionals to pay greater attention to the implications of the emerging cloud environment. There is a need for further research on how the concept of extraterritoriality and transborder laws can be applied to develop model laws for the management and preservation of records in the cloud. Originality/value – The paper identifies record-related risks linked to the cloud by analyzing court cases and archival legislation. The paper examines maritime law to find useful principles that the archival field could draw on to mitigate some of these risks.

Assessing the effectiveness of a national resource sharing system

2014 ◽  
Vol 42 (2/3) ◽  
pp. 98-104 ◽  
Author(s):  
Silvana Mangiaracina ◽  
Cristina Cocever ◽  
Marco Chiandoni ◽  
Stefania Arabito
Keyword(s):  
User Satisfaction ◽  
Resource Sharing ◽  
Design Methodology ◽  
Swot Analysis ◽  
Qualitative Assessment ◽  
Library Services ◽  
Content Type ◽  
Italian Studies ◽  
User Expectations ◽  
National Resource

Purpose – The purpose of this paper is to report on the surveys, carried out during 2011 and 2013, regarding the functionality of and possible improvements to Italy’s nationwide resource sharing service NILDE (Network for Inter-Library Document Exchange). Design/methodology/approach – The methodology comprises both an analysis of quantitative data about ILL transactions initiated during a 2011 study and a qualitative assessment of the system based on information obtained from the surveys and a SWOT analysis. This proved to be an effective methodology, and a new survey was launched in 2013 to verify whether the choices made and the projects undertaken were in line with user expectations. Findings – The results turned out to be particularly interesting and a source of hints for planning future improvements. Originality/value – Italian studies for assessing user satisfaction of library services, based on user surveys, often relate to a single library or a single University. The NILDE survey was delivered nationwide to all the registered users of NILDE. This is the most extensive survey for the number of libraries and the various types of end users involved.

How to protect reader lending privacy under a cloud environment: a technical method

2020 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Zongda Wu ◽  
Shigen Shen ◽  
Chenglang Lu ◽  
Huxiong Li ◽  
Xinning Su
Keyword(s):  
Theoretical Analysis ◽  
Digital Library ◽  
Experimental Evaluation ◽  
Privacy Protection ◽  
Design Methodology ◽  
Cloud Environment ◽  
Effective Mechanism ◽  
Database Queries ◽  
Content Type ◽  
Cloud Database

PurposeIn this paper, the authors propose an effective mechanism for the protection of digital library readers' lending privacy under a cloud environment.Design/methodology/approachThe basic idea of the method is that for each literature circulation record, before being submitted to the untrusted cloud database of a digital library for storage, its reader number has to be encrypted strictly at a client, so as to make it unable for an attacker at the cloud to know the specific reader associated with each circulation record and thus protect readers' lending privacy. Moreover, the authors design an effective method for querying the encrypted literature circulation records, so as to ensure the accuracy and efficiency of each kind of database queries related to the encrypted reader number field of literature circulation records.FindingsFinally, both theoretical analysis and experimental evaluation demonstrate the effectiveness of the proposed methods.Originality/valueThis paper presents the first study attempt to the privacy protection of readers' literature circulations, which can improve the security of readers' lending privacy in the untrusted cloud, without compromising the accuracy and efficiency of each kind of database queries in the digital library. It is of positive significance to construct a privacy-preserving digital library platform.

User satisfaction with outsourced facility management (FM) services in multi-tenanted shopping malls in Ghana

Facilities ◽  
2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Oliver Tannor ◽  
Elvis Attakora-Amaniampong ◽  
Williams Miller Appau
Keyword(s):  
Decision Making ◽  
User Satisfaction ◽  
Design Methodology ◽  
Facility Management ◽  
Shopping Malls ◽  
Content Type ◽  
Four Dimensions ◽  
Perceived Satisfaction ◽  
Property Owners ◽  
Levels Of Service

Purpose This study aims to assess the satisfaction of users with outsourced facility management (FM) services in multi-tenant shopping malls (SMs) in Accra, Ghana. Design/methodology/approach This study measured user satisfaction (US) with 15 FM services using the perception of internal users about the attitude and courtesy of the personnel who provide the services, the reliability of the services, their responsiveness and their competence. This study used survey data from 117 users who have actively used these services for at least 12 months using structured questionnaires. The data was descriptively analysed to assess the perceived satisfaction of the users in five SMs. Findings The results showed that users were satisfied with the delivery of all 15 services (each had a mean above 3.0 which is the benchmark satisfaction point). The findings also showed high levels of service quality with the four dimensions of satisfaction investigated. Originality/value This study demonstrates US with outsourced FM services for multi-tenant SMs in Ghana. Practically, property owners, potential investors and other stakeholders can rely on the findings for effective FM strategy decision-making. Facility managers can rely on these findings to review their service delivery for the better.

Analysis of user satisfaction for unisex medical uniforms

2017 ◽  
Vol 21 (3) ◽  
pp. 162-177
Author(s):  
Injoo Kim ◽  
Brooke Brandewie ◽  
Myoung-Ok Kim
Keyword(s):  
User Satisfaction ◽  
Medical Staff ◽  
Design Methodology ◽  
Current Medical ◽  
Satisfaction Level ◽  
Design Development ◽  
Content Type ◽  
Sizing System ◽  
Practical Implications

Purpose This paper aims to analyze the medical uniform wearers’ needs by surveying the current medical uniform sizing system and issues, and to evaluate fit satisfaction level of medical uniform wear by gender with scrub shirts, pants and coats. Design/methodology/approach Research was conducted using a quantitative questionnaire, and the respondents’ data results were analyzed using SPSS. Findings The distinguished difference from the medical uniform and daily wear was that the medical garments’ sizing system had only alphabet sizing options, and the wearing ease was larger than that of daily wear. Fabric preferences included the combination of “stretch fabrics + non-stretch fabrics”. All male respondents’ satisfaction levels were reported higher than those of female respondents. Respondents were the least satisfied with the pants, followed by the shirts, and the coat in that order. As the current medical uniform has been developed based on the male figure, there were significant needs overall for improving the fit of the female medical uniform. Practical implications The study quantified fit satisfaction levels to suggest specific improvements that should be made to the design and fit of the female pants along with the coat using new comfortable textiles to achieve better performance for all medical staff. Originality/value This research specifically evaluated fit satisfaction levels of the medical uniform provided by hospital institutions in Ohio, attempting to suggest improvements for future medical uniform and design development to increase overall fit satisfaction.

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