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Article
Publication date: 29 April 2021

Mohamed Haddache, Allel Hadjali and Hamid Azzoune

The study of the skyline queries has received considerable attention from several database researchers since the end of 2000's. Skyline queries are an appropriate tool…

Abstract

Purpose

The study of the skyline queries has received considerable attention from several database researchers since the end of 2000's. Skyline queries are an appropriate tool that can help users to make intelligent decisions in the presence of multidimensional data when different, and often contradictory criteria are to be taken into account. Based on the concept of Pareto dominance, the skyline process extracts the most interesting (not dominated in the sense of Pareto) objects from a set of data. Skyline computation methods often lead to a set with a large size which is less informative for the end users and not easy to be exploited. The purpose of this paper is to tackle this problem, known as the large size skyline problem, and propose a solution to deal with it by applying an appropriate refining process.

Design/methodology/approach

The problem of the skyline refinement is formalized in the fuzzy formal concept analysis setting. Then, an ideal fuzzy formal concept is computed in the sense of some particular defined criteria. By leveraging the elements of this ideal concept, one can reduce the size of the computed Skyline.

Findings

An appropriate and rational solution is discussed for the problem of interest. Then, a tool, named SkyRef, is developed. Rich experiments are done using this tool on both synthetic and real datasets.

Research limitations/implications

The authors have conducted experiments on synthetic and some real datasets to show the effectiveness of the proposed approaches. However, thorough experiments on large-scale real datasets are highly desirable to show the behavior of the tool with respect to the performance and time execution criteria.

Practical implications

The tool developed SkyRef can have many domains applications that require decision-making, personalized recommendation and where the size of skyline has to be reduced. In particular, SkyRef can be used in several real-world applications such as economic, security, medicine and services.

Social implications

This work can be expected in all domains that require decision-making like hotel finder, restaurant recommender, recruitment of candidates, etc.

Originality/value

This study mixes two research fields artificial intelligence (i.e. formal concept analysis) and databases (i.e. skyline queries). The key elements of the solution proposed for the skyline refinement problem are borrowed from the fuzzy formal concept analysis which makes it clearer and rational, semantically speaking. On the other hand, this study opens the door for using the formal concept analysis and its extensions in solving other issues related to skyline queries, such as relaxation.

Details

International Journal of Intelligent Computing and Cybernetics, vol. 14 no. 3
Type: Research Article
ISSN: 1756-378X

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Article
Publication date: 21 August 2017

Kuo-Cheng Ting, Ruei-Ping Wang, Yi-Chung Chen, Don-Lin Yang and Hsi-Min Chen

Using social networks to identify users with traits similar to those of the target user has proven highly effective in the development of personalized recommendation…

Abstract

Purpose

Using social networks to identify users with traits similar to those of the target user has proven highly effective in the development of personalized recommendation systems. Existing methods treat all dimensions of user data as a whole, despite the fact that most of the information related to different dimensions is discrete. This has prompted researchers to adopt the skyline query for such search functions. Unfortunately, researchers have run into problems of instability in the number of users identified using this approach.

Design/methodology/approach

We thus propose the m-representative skyline queries to provide control over the number of similar users that are returned. We also developed an R-tree-based algorithm to implement the m-representative skyline queries.

Findings

By using the R-tree based algorithm, the processing speed of the m-representative skyline queries can now be accelerated. Experiment results demonstrate the efficacy of the proposed approach.

Originality/value

Note that with this new way of finding similar users in the social network, the performance of the personalized recommendation systems is expected to be enhanced.

Details

Information Discovery and Delivery, vol. 45 no. 3
Type: Research Article
ISSN: 2398-6247

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Article
Publication date: 10 June 2020

Farnaz Mohseni, Silke Weidner and Michael Kloos

The historic city of Shiraz, in the south of Iran, is renowned for its monuments and its remarkable macro skyline, which has been destructively affected by the rapid urban…

Abstract

Purpose

The historic city of Shiraz, in the south of Iran, is renowned for its monuments and its remarkable macro skyline, which has been destructively affected by the rapid urban development. This research proposes a systematic historical analysis, which can discover the driving forces behind the evolution of the macro skyline of Shiraz, in the past as well as contemporary times.

Design/methodology/approach

The proposed general framework of the methodology is constituted of systematic historical mapping and documentation, which is based on a desk study and field research. Moreover, by means of this methodology, different layers and driving forces of shaping the urban macro skyline are extracted.

Findings

The outcome demonstrates 12 driving forces or contributing factors behind the evolution of the urban macro skyline. Based on the results, it is concluded that there was a shift in the subject and content of driving forces during the last century that has contributed to the destructive effects on the silhouette of Shiraz in turn.

Practical implications

It is suggested that the proposed comprehensive method, which is based on the historical analysis and the field survey, can be applied as a documentation platform. It is believed that the analysis and the extraction of driving forces can facilitate future urban landscape management plans as well as possible impact assessments.

Originality/value

Many studies rely on the analysis of historical data in landscape assessment. Nevertheless, this research develops an innovative historical analysis, which identifies the driving forces behind the evolution of the urban macro skyline over time.

Details

Journal of Cultural Heritage Management and Sustainable Development, vol. 10 no. 4
Type: Research Article
ISSN: 2044-1266

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Article
Publication date: 30 April 2021

Francisco Sierra

This paper reviews the current literature on the major challenges faced by building contractors in the UK due to COVID-19 to create an evaluation framework.

Abstract

Purpose

This paper reviews the current literature on the major challenges faced by building contractors in the UK due to COVID-19 to create an evaluation framework.

Design/methodology/approach

A PRISMA scoping review systematically maps the information published and establishes the potential challenges, as a precursor to a literature review that synthesises the data available to establish an initial COVID-19 evaluation framework to build a rationale for a future series of studies.

Findings

The research identified these seven challenges: health and safety on-site, economic cost, possible legal exposures, manpower availability, instability of the supply chain and subcontractors, and the uncertainty related to the constant and unpredictable evolution of the pandemic. The magnitude of each challenge was also found to differ depending on the size of the contractor, the rigor of local regulations and the sector where the contractor works.

Research limitations/implications

This research contributes to increasing understanding on the subject and provides an initial assessment framework, based on these seven parameters, so that contractors can analyse their weaknesses and plan specific priorities so that their companies can remain competitive, minimising the impact of COVID-19 and possible future waves.

Originality/value

This research is timely and relevant as it produces the first academic review on how COVID-19 has affected contractors and the construction stage. This document gives a holistic view of the new scenario created by COVID-19 and creates a self-assessment system for contractors to test their resistance to COVID-19.

Details

Engineering, Construction and Architectural Management, vol. ahead-of-print no. ahead-of-print
Type: Research Article
ISSN: 0969-9988

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Article
Publication date: 1 February 1985

Takeo Taniguchi and Akira Soga

The minimum profile problem of a sparse matrix is theoretically treated, and by using the results a new profile reducer is proposed. Numerical experiments clarify that the…

Abstract

The minimum profile problem of a sparse matrix is theoretically treated, and by using the results a new profile reducer is proposed. Numerical experiments clarify that the new reducer is effective for the node re‐ordering of graphs with rather complex configuration. Further considerations on the proposed method and numerical error of the skyline method are also given.

Details

Engineering Computations, vol. 2 no. 2
Type: Research Article
ISSN: 0264-4401

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Article
Publication date: 1 January 2006

The paper aims to describe the human‐resource (HR) management practices that helped the Sheraton Skyline Hotel to win the London Excellence award for organizational learning.

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Abstract

Purpose

The paper aims to describe the human‐resource (HR) management practices that helped the Sheraton Skyline Hotel to win the London Excellence award for organizational learning.

Design/methodology/approach

The paper draws on information provided by the hotel's general manager.

Findings

The paper describes how the hotel recruits people on the basis of attitude rather than skills, trains them, uses 360‐degree feedback as a basis for setting their development priorities, communicates with them in an innovative way and employs a wide range of incentive schemes to preserve the “family” feel of employment at the hotel.

Practical implications

Contains plenty to interest HR managers operating in areas where employee turnover is traditionally high.

Originality/value

The paper demonstrates that recruiting the right people, training them properly and treating them well in their work can significantly reduce employee turnover and improve customer satisfaction in the hotel industry.

Details

Human Resource Management International Digest, vol. 14 no. 1
Type: Research Article
ISSN: 0967-0734

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Article
Publication date: 3 June 2021

Sabeeh Lafta Farhan, Venus Suleiman Akef and Zuhair Nasar

The objective of this paper is mainly to contribute to and activate, the process of saving and preserving the rich tangible and intangible heritage embraced in the…

Abstract

Purpose

The objective of this paper is mainly to contribute to and activate, the process of saving and preserving the rich tangible and intangible heritage embraced in the historic center of Al-Najaf city. This was possible through examining the existing historic urban and architectural structures of the city, unveiling the major issues that are threatening both its traditional cultural and architectural identity, and finally analyzing similar examples that proved to be successful in addressing similar problems in order to derive possible strategies for saving, preserving and revitalizing the historical center of Al-Najaf Old City.

Design/methodology/approach

This paper addresses the major problems of heritage preservation in Al-Najaf City (750 AD), which is one of the historical and most sacred religious centers especially for Shia Muslims around the world. Despite its importance, the rich cultural and architectural heritage of the city is dramatically neglected and seriously threatened to be lost.

Findings

Preservation in Al-Najaf City is proposed as a sustainable development strategy. Top-down and bottom-up strategies are proposed not only for preserving the historic architectural and urban characteristics of the city but also for reviving its social and cultural activities and traditions.

Originality/value

The major issues addressed in this paper include the fragmentation and decentralization of the cohesive traditional urban fabric, the disruption of the spatial organization, the deformation of the traditional architectural characteristics of the city and its skyline, the discontinuity of facades' patterns, the destruction and demolition of historical buildings, the transformation of land use, and the regression of traditional social and cultural activities.

Details

Journal of Cultural Heritage Management and Sustainable Development, vol. ahead-of-print no. ahead-of-print
Type: Research Article
ISSN: 2044-1266

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Book part
Publication date: 16 May 2013

Monika Grubbauer

This chapter explores how architecture is used as a signifier in the development and promotion of urban megaprojects (UMPs). It argues that these projects rely on…

Abstract

This chapter explores how architecture is used as a signifier in the development and promotion of urban megaprojects (UMPs). It argues that these projects rely on architecture to gain visibility. First, UMPs need to be highly visible in order to justify their exceptional status and second, they have to be visibly new and different in order to initiate the desired symbolic transformations with which they are attributed. Drawing on the case studies of HafenCity in Hamburg and Donau City in Vienna the chapter traces the logics of using architecture as a signifier and means of legitimizing the UMP. Data on the planning history of the two case studies, their administrative and institutional frameworks and the overall urban development strategies is combined with a qualitative text and image centered analysis of marketing material, planning documents, and press articles. The discussion shows how visibility is achieved by very different means. The question of how to distinguish the UMP from other projects and of how to make it uniquely identified with the particular city guides the debate in both cases. However, the lines of argument are not predictable or easily comparable from city to city and “global architecture” emerges as a contradictory and relative concept. Based on a succinct review of the related literature the chapter disputes the alleged uniformity of UMPs and argues for a meaning and discourse-oriented approach to the analysis of architecture as vehicle of urban change and political legitimation.

Details

Urban Megaprojects: A Worldwide View
Type: Book
ISBN: 978-1-78190-593-7

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Article
Publication date: 1 July 1984

Alec Snobel

The author describes his forays into two London hotels and assesses their facilities for business travellers.

Abstract

The author describes his forays into two London hotels and assesses their facilities for business travellers.

Details

Industrial Management & Data Systems, vol. 84 no. 7/8
Type: Research Article
ISSN: 0263-5577

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Case study
Publication date: 17 August 2016

Craig Furfine

With interest rates near all-time lows in late 2015, Stanley Cirano knew it was an opportune time to consider the financing on his portfolio of commercial real estate…

Abstract

With interest rates near all-time lows in late 2015, Stanley Cirano knew it was an opportune time to consider the financing on his portfolio of commercial real estate. Cirano Properties was the general partner on three separate private equity investments of retail shopping centers in suburban Chicago. The first, Brookline Road Shopping Center, had been acquired in 2006 and had been managed through the financial crisis and real estate downturn. The property was performing well and Cirano wondered whether it made sense to refinance or sell. The second property, Columbus Festival Plaza, had been acquired in a 2010 bankruptcy auction. Although the property had needed a good amount of capital improvements, Cirano was proud of the growth in net operating income he had been able to generate. The final property, Deerwood Acres, had been developed by Cirano himself after acquiring the property in 2013 from the previous owner, who had been operating a go-cart track and drive-in theater on the land. Cirano expected great things from the property, though his lease-up had been slower than anticipated.

Although the three properties had different levels of performance and presented different management issues, they all shared the fact that they were all significantly financed, in part, with debt. As the properties were acquired at different times, Cirano had simply selected what seemed like reasonable financing at the time. With his concern that interest rates would soon be rising, Cirano thought it made sense to take a holistic view of his portfolio, consider what debt options were available to him, and make a sound strategic decision on the financing of all his assets at the same time.

Details

Kellogg School of Management Cases, vol. no.
Type: Case Study
ISSN: 2474-6568
Published by: Kellogg School of Management

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