1,721,024 research outputs found
Graph-based selective outlier ensembles
No full textAn ensemble technique is characterized by the mechanism that generates the components and by the mechanism that combines them. A common way to achieve the consensus is to enable each component to equally participate in the aggregation process. A problem with this approach is that poor components are likely to negatively affect the quality of the consensus result. To address this issue, alternatives have been explored in the literature to build selective classifier and cluster ensembles, where only a subset of the components contributes to the computation of the consensus. Of the family of ensemble methods, outlier ensembles are the least studied. Only recently, the selection problem for outlier ensembles has been discussed. In this work we define a new graph-based class of ranking selection methods. A method in this class is characterized by two main steps: (1) Mapping the rankings onto a graph structure; and (2) Mining the resulting graph to identify a subset of rankings. We define a specific instance of the graph-based ranking selection class. Specifically, we map the problem of selecting ensemble components onto a mining problem in a graph. An extensive evaluation was conducted on a variety of heterogeneous data and methods. Our empirical results show that our approach outperforms state-of-the-art selective outlier ensemble techniques
Effect of Applying Business Intelligence on Export Development and Brand Internationalization in Large Industrial Firms
Full text linkEvaluating urban housing development patterns in developing countries: Case study of Worn-out Urban Fabrics in Iran
Full text linkThe restoration of Worn-out Urban Fabrics (WoUFs), i.e., the disfiguration of fabric components of the city from their main shape, and the implementation of the urban housing development plan have always been pivotal activities for designing livable cities – especially in developing countries. Prior research, however, did not identify an appropriate model of sustainable housing development for the recovery of WoUFs. To fill this gap, housing development patterns – i.e., supportive housing, Mehr housing, rental, and social housing – aimed at restoring the WoUF of the Hemmatabad district in Isfahan city (Iran) were studied. Expert opinions, on the criteria affecting the selection of housing development patterns, from 40 professionals in urban management and urban development models were collected and then analyzed by the Analytic Hierarchical Process and VIKOR method. It resulted that, in order to revive the WoUF of Hemmatabad, social housing is the more desirable pattern of housing development (Qi = 1) compared to supportive housing (Qi = 0.911), Mehr housing (Qi = 0.117) and rental housing (Qi = 0.004). Results help governments of developing countries in directing their effort in the decision of which housing development pattern for WoUFs to implement
Assessing the Barriers and Risks to Private Sector Participation in Infrastructure Construction Projects in Developing Countries of Middle East
Full text linkIn developing countries, governments are often unable to implement urban infrastructure construction projects (UICPs) on their own, mainly due to budget and financial resource limitations. The participation of the private sector, through public–private partnerships (PPPs), has been considered as an alternative effective method for increasing the efficiency and productivity of urban infrastructure development. However, in many developing countries such as those situated in the Middle East, attracting private sector investments for UICPs uncovers profound challenges that have not ever been comprehensively accounted for and prioritized. To fill this knowledge gap, this study seeks to determine and prioritize the major barriers and risks faced by governments and urban managers in attracting private sector investments through the PPP schemes launched by developing countries in the Middle East. Based on a Delphi study conducted in Iran as an example, the opinions of 60 UICPs experts in both the public and private sectors were collected and analyzed. Results show that technical and organizational barriers and risks were perceived as the most important to private sector participation, followed by economic and financial barriers and risks, and then political and legal barriers and risk
Determining and assessing the risks of commercial and recreational complex building projects in developing countries: a survey of experts in Iran
No full textAs construction of commercial and recreational complex building projects (CRCBPs) is one of the most important issues in many developing countries and requires a very high cost of implementation, it is important to identify and prioritize the risks of such projects. Therefore, the purpose of this study is to identify and rank the risks of CRCBPs by studying the case of the “Hamedanian Memorial,” a CRCBP in Iran. To pursue this aim, a descriptive-survey method was used. The statistical population of the study consists of 30 experienced experts (consultants, contractors and employers) of the “Hamedanian Memorial” project selected according to the Cochran formula and minimum population census. A questionnaire was used as the data collection tool, administered in all stages of risk identification and evaluation, and was devised by using library and field methods based on the literature and research background, as well as interviewing experts in the risk identification and evaluation stages. Kendall’s coefficient of agreement was used to validate the experts’ opinions in the risk identification stage. The ranking in qualitative evaluation was done based on the risk intensity and the cumulative risk index. The results show that the risks are associated with exchange rate fluctuation, inflation fluctuation, access to skilled workers, contractors’ claims and foreign threats from international relations. The results and findings of the present study can be of interest to the executives of large commercial, leisure, public and private projects in developing and developed countries; understanding risks can significantly improve the decision-making process of CRCBPs
Factors affecting suppliers' capacity in outsourcing: a study of the Water and Wastewater Company of Iran
No full textWhat are the major factors able to increase the capacity of suppliers
in outsourcing processes? To answer this research question, a three-round
Delphi survey was administered to an expert panel composed of 50 industrial
experts of the Water and Wastewater Company (WWC) in Iran. The
administered questionnaire – based on 50 items categorised into four groups:
judicial-legal, contract, management and financial – was developed based on
prior literature and experts’ answers. Respondents have been asked to evaluate
each item with regard to the capacity of suppliers in outsourcing processes on a
five-point Likert scale. Factor analysis, one-sample t-test and the Friedman test
were used for data analysis. Results show that the factor categories able to
increase the capacity of suppliers in outsourcing processes at WWC are the
following, in order of importance: financial, judicial-legal, contracts and
management. The findings help to focus on shortcomings and deficiencies of
current outsourcing processes
Barriers and solutions in adopting public-private partnerships in road transportation infrastructure projects for developing countries: results of a Delphi survey in Iran
No full textPurpose
Sustainable economic growth in both developed and developing countries requires the restructuring and expansion of road transportation infrastructures (RTIs). However, RTIs are always subject to high costs and delays, especially in developing countries with fewer resources than developed ones. Cost overruns and inaccurate forecasts usually lead to project failures. In this regard, some governments in developing countries have adopted public–private partnerships (PPPs) to deliver RTI projects with very positive outcomes. However, academic research has not yet studied the most recurring barriers and associated solutions to adopting PPPs in RTIs particularly for developing countries. This paper aims to fill up this knowledge gap in the existing literature.
Design/methodology/approach
A Delphi survey method involving 103 experts in RTIs based in Iran was implemented. Results indicated that the most perceived barriers to applying PPPs in RTIs in developing countries are linked to political, legal and economic factors. Ten other experts also participated in semistructured interviews, which were thematically analyzed to provide practical effective solutions for overcoming those identified barriers.
Findings
The findings indicated that all the presented barriers achieved above-average scores and could be considered severe obstacles of applying PPPs in RTIs for developing countries. In terms of barriers and solutions reported, these seem to converge on three profound elements: political stability, legal framework and conjoint management.
Originality/value
To the best of the authors’ knowledge, this is the first-ever research study regarding the barriers to adopting PPPs in delivering RTI projects for developing countries. Practical recommendations for overcoming these perceived barriers and achieving better implementation of PPPs in RTIs for developing countries were advocated. This work has contributed to the extant PPP theory as the management of coproduction in delivering RTI projects
Completing abandoned public facility projects by the private sector: results of a Delphi survey in the Iranian Water and Wastewater Company
No full textPurpose
Completion of abandoned public facility projects is one of the major concerns of governments struggling with budget issues. Various research studies have shown that this can only be solved with the help of the private sector. Therefore, this study aims to investigate the capacity of the private sector to complete abandoned public facility projects through the study of the Water and Wastewater Company in Iran.
Design/methodology/approach
The Delphi survey questionnaires, which were distributed to and responded by a panel of experts – i.e. three groups of employers of the Iranian Water and Wastewater Company, consulting agents and private sector stakeholders engaging with Water and Wastewater Company projects – identified 50 critical factors allowing the private sector to carry out abandoned facility projects. These have been categorized into four components: financial capacities, management competency, knowledge and expertise and resources and facilities. A descriptive survey method was used to determine and prioritize these factors.
Findings
The survey findings indicate that knowledge and expertise are the main important clusters of factors influencing the completion of abandoned public facility projects. The value of these results is essential in providing the sound basis for mutual trust between the private sector and the public sector for greater participation, thereby helping to complete abandoned public facility projects.
Originality/value
To the best of the authors’ knowledge, this is the first study attempting to investigate the capacity of the private sector to complete abandoned public facility projects through an empirical analysis of factors influencing their completion
Identification and Prioritization of Critical Risk Factors of Commercial and Recreational Complex Building Projects: A Delphi Study Using the TOPSIS Method
Full text linkConstruction development of Commercial and Recreational Complex Building Projects (CRCBPs) is one of the community needs of many developing countries. Since the implementation of these projects is usually very costly, identifying and evaluating their Critical Risk Factors (CRFs) are of significant importance. Therefore, the current study aims to identify and prioritize CRFs of CRCBPs in the Iranian context. A descriptive-survey method was used in this research; the statistical population, selected based on the purposive sampling method, includes 30 construction experts with hands-on experience in CRCBPs. A questionnaire related to the risk identification stage was developed based on a detailed study of the research literature and also using the Delphi survey method; 82 various risks were finally identified. In order to confirm the opinions of experts in identifying the potential risks, Kendall’s coefficient of concordance was used. In the first stage of data analysis, qualitative evaluation was performed by calculating the severity of risk effect and determining the cumulative risk index, based on which 25 CRFs of CRCBPs were identified for more accurate evaluation. At this stage, the identified CRFs were evaluated based on multi-criteria decision-making techniques and using the TOPSIS technique. Results show that the ten CRFs of CRCBPs are external threats from international relations, exchange rate changes, bank interest rate fluctuations, traffic licenses, access to skilled labor, changes in regional regulations, the condition of adjacent buildings, fluctuations and changes in inflation, failure to select a suitable and qualified consultant, and employer’s previous experiences and records. Obviously, the current study’s results and findings can be considered by CRCBPs in both the private and public sectors for proper effective risk identification, evaluation, and mitigatio
Barriers to Attracting Private Sector Investment in Public Road Infrastructure Projects in the Developing Country of Iran
Full text linkAbstract
Private sector investment, the mainstream financing method for procuring public road transport development projects, has encountered several profound difficulties and risks during execution, particularly in developing countries. However, there needs to be more extensive investigations on the major barriers facing road transport infrastructure projects in these countries. In this vein, the present study aims to identify and assess the perceived barriers inhibiting private sector investment in delivering public road transport infrastructure projects in the developing country of Iran. The research method adopted is based on a descriptive survey with a three-round Delphi technique with 35 experts from both the private and public sector in Iran. According to the research study results, four main groups of legal and organizational, political, economic, and operational barriers have been found to significantly impact the attraction of private sector investment in such projects. The three most significant obstacles for public road transport infrastructure projects in developing countries include: (i) a lack of financial and investment safety; (ii) a lack of proficient managers and policies of public organizations in order to facilitate the process of privatization; and (iii) corruption in the privatization process. The survey findings can help the government and policymakers to eliminate or alleviate the potential barriers towards private sector participation in future public road infrastructure projects, particularly in those developing countries such as Iran
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