Pub Date : 2015-10-01DOI: 10.1109/IESM.2015.7380281
N. Nahas, M. Nourelfath
In this paper, we consider a serial production line consisting of n unreliable machines with n-1 buffers. The objective is to determine the optimal preventive maintenance policy, the optimal selection of machines and the optimal buffer allocation that will minimize the total system cost subject to a given system throughput level. We assume that the mean time between failures (MTBF) of all machines will be increased when performing periodic preventive maintenance. An analytical decomposition-type approximation is used to estimate the production line throughput. The optimal design problem is formulated as a combinatorial optimization one where the decision variables are buffer levels, types of machines and times between preventive maintenance. To solve this problem, a Genetic algorithm is proposed. A numerical example is presented to illustrate the model.
{"title":"Buffer allocation, machine selection and preventive maintenance optimization in unreliable production lines","authors":"N. Nahas, M. Nourelfath","doi":"10.1109/IESM.2015.7380281","DOIUrl":"https://doi.org/10.1109/IESM.2015.7380281","url":null,"abstract":"In this paper, we consider a serial production line consisting of n unreliable machines with n-1 buffers. The objective is to determine the optimal preventive maintenance policy, the optimal selection of machines and the optimal buffer allocation that will minimize the total system cost subject to a given system throughput level. We assume that the mean time between failures (MTBF) of all machines will be increased when performing periodic preventive maintenance. An analytical decomposition-type approximation is used to estimate the production line throughput. The optimal design problem is formulated as a combinatorial optimization one where the decision variables are buffer levels, types of machines and times between preventive maintenance. To solve this problem, a Genetic algorithm is proposed. A numerical example is presented to illustrate the model.","PeriodicalId":308675,"journal":{"name":"2015 International Conference on Industrial Engineering and Systems Management (IESM)","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114854347","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-10-01DOI: 10.1109/IESM.2015.7380274
D. Horla
In this regular session some different research areas are introduced with regards to the Operations, Human Factor and Safety problems.
在这个定期会议上，介绍了有关操作，人为因素和安全问题的一些不同的研究领域。
{"title":"Regular session industrial processes","authors":"D. Horla","doi":"10.1109/IESM.2015.7380274","DOIUrl":"https://doi.org/10.1109/IESM.2015.7380274","url":null,"abstract":"In this regular session some different research areas are introduced with regards to the Operations, Human Factor and Safety problems.","PeriodicalId":308675,"journal":{"name":"2015 International Conference on Industrial Engineering and Systems Management (IESM)","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121905310","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-10-01DOI: 10.1109/IESM.2015.7380138
Eva Vallada, Rubén Ruiz
The gap between scheduling theory and practice has been long known, recognized and studied. More often than not, elaborated scheduling models and procedures are proven to be extremely effective in controlled and synthetic laboratory problems but rarely applied in practical manufacturing scheduling. Real scheduling problems are varied, big and rich in the number of constraints and special characteristics.
{"title":"Realistic manufacturing scheduling - 1","authors":"Eva Vallada, Rubén Ruiz","doi":"10.1109/IESM.2015.7380138","DOIUrl":"https://doi.org/10.1109/IESM.2015.7380138","url":null,"abstract":"The gap between scheduling theory and practice has been long known, recognized and studied. More often than not, elaborated scheduling models and procedures are proven to be extremely effective in controlled and synthetic laboratory problems but rarely applied in practical manufacturing scheduling. Real scheduling problems are varied, big and rich in the number of constraints and special characteristics.","PeriodicalId":308675,"journal":{"name":"2015 International Conference on Industrial Engineering and Systems Management (IESM)","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121982832","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-10-01DOI: 10.1109/IESM.2015.7380310
Asma Boussellaa, M. Abed
The work presented in this paper is the modeling of an information system supporting all activities of the reverse logistics(RL). In order to gather knowledge about the current state of the art on this topic, a literature review is established for the available research works which are classified using a suitable criteria. Based on this review, our work consist of developing an information system (IS) design for reverse logistics (RL) management. The proposed modeling is based on an object-oriented analysis approach. The results announced at the analysis step includes the use case diagrams which modeling the dynamic aspect of the system with the actors interacting processes and a class diagram that models the key concepts of information managed in the system. This modeling is generic for a company which takes into account good practices in RL.
{"title":"Information system design for reverse logistics management using UML","authors":"Asma Boussellaa, M. Abed","doi":"10.1109/IESM.2015.7380310","DOIUrl":"https://doi.org/10.1109/IESM.2015.7380310","url":null,"abstract":"The work presented in this paper is the modeling of an information system supporting all activities of the reverse logistics(RL). In order to gather knowledge about the current state of the art on this topic, a literature review is established for the available research works which are classified using a suitable criteria. Based on this review, our work consist of developing an information system (IS) design for reverse logistics (RL) management. The proposed modeling is based on an object-oriented analysis approach. The results announced at the analysis step includes the use case diagrams which modeling the dynamic aspect of the system with the actors interacting processes and a class diagram that models the key concepts of information managed in the system. This modeling is generic for a company which takes into account good practices in RL.","PeriodicalId":308675,"journal":{"name":"2015 International Conference on Industrial Engineering and Systems Management (IESM)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130357874","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-10-01DOI: 10.1109/IESM.2015.7380157
F. Kristjanpoller, M. López-Campos, P. Viveros, A. Crespo Márquez
The present study defines a methodology to analyze the relationship between the failure rate of any component and the factors that can influence it, in order to link time independent operating variables to the reliability study. Characterizing the failure rate using these variables is especially useful for changing time operational contexts. To do this, a study of traditional and modern methods of analysis, together with the assumptions that must be fulfill for its implementation and the methodology for testing the assumptions is performed. Specifically, the methodology proposed in this paper is used to develop a complete study of the influence of the energy consumption of a component, at the rate of engine failure. As can be inferred, there is a relationship between energy consumption and the rate of failure; the practical experience reveals that companies frequently use the energy expenditure variable, but documented studies that corroborate their decision are not found in the literature.
{"title":"Reliability assessment based on energy consumption as a failure rate factor","authors":"F. Kristjanpoller, M. López-Campos, P. Viveros, A. Crespo Márquez","doi":"10.1109/IESM.2015.7380157","DOIUrl":"https://doi.org/10.1109/IESM.2015.7380157","url":null,"abstract":"The present study defines a methodology to analyze the relationship between the failure rate of any component and the factors that can influence it, in order to link time independent operating variables to the reliability study. Characterizing the failure rate using these variables is especially useful for changing time operational contexts. To do this, a study of traditional and modern methods of analysis, together with the assumptions that must be fulfill for its implementation and the methodology for testing the assumptions is performed. Specifically, the methodology proposed in this paper is used to develop a complete study of the influence of the energy consumption of a component, at the rate of engine failure. As can be inferred, there is a relationship between energy consumption and the rate of failure; the practical experience reveals that companies frequently use the energy expenditure variable, but documented studies that corroborate their decision are not found in the literature.","PeriodicalId":308675,"journal":{"name":"2015 International Conference on Industrial Engineering and Systems Management (IESM)","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125706566","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-10-01DOI: 10.1109/IESM.2015.7380293
Amílcar Arantes, Pedro Fernandez da Silva, L. Ferreira
The main aim of this paper is to identify the main causes for the delays in the Portuguese construction industry and its impact, with the purpose of increasing knowledge on the causes and impacts of delays in construction projects. The Relative Importance Index was adopted to classify the importance of the 47 causes and six impacts identified causes of delays. Results show the main causes of delay are slow decision-making, changes to orders, unrealistic timescales and poor contract specifications, financial constraints on the contractor and the type of bidding and contract award process. The main impacts are time and cost overruns and disputes. Factor analysis revealed eight high-level causes that result in 26 of the original causes. Finally, Pearson correlation coefficients were calculated to find the relationship between the extracted factors (latent causes) and impacts, revealing that lack of commitment and substandard contracts are positively correlated with all impacts, and poor consultant performance is negatively correlated with time overrun. These findings are expected to improve the scientific community's knowledge of construction management.
{"title":"Delays in construction projects - causes and impacts","authors":"Amílcar Arantes, Pedro Fernandez da Silva, L. Ferreira","doi":"10.1109/IESM.2015.7380293","DOIUrl":"https://doi.org/10.1109/IESM.2015.7380293","url":null,"abstract":"The main aim of this paper is to identify the main causes for the delays in the Portuguese construction industry and its impact, with the purpose of increasing knowledge on the causes and impacts of delays in construction projects. The Relative Importance Index was adopted to classify the importance of the 47 causes and six impacts identified causes of delays. Results show the main causes of delay are slow decision-making, changes to orders, unrealistic timescales and poor contract specifications, financial constraints on the contractor and the type of bidding and contract award process. The main impacts are time and cost overruns and disputes. Factor analysis revealed eight high-level causes that result in 26 of the original causes. Finally, Pearson correlation coefficients were calculated to find the relationship between the extracted factors (latent causes) and impacts, revealing that lack of commitment and substandard contracts are positively correlated with all impacts, and poor consultant performance is negatively correlated with time overrun. These findings are expected to improve the scientific community's knowledge of construction management.","PeriodicalId":308675,"journal":{"name":"2015 International Conference on Industrial Engineering and Systems Management (IESM)","volume":"62 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126272328","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-10-01DOI: 10.1109/IESM.2015.7380185
M. Bevilacqua, F. Ciarapica, Ilaria De Sanctis, G. Mazzuto, C. Paciarotti
The purpose of this paper is to automate a manual assembly line following a structured framework, in a motorcyclist industry. Process re-engineering is implemented in order to improve and automate the assembly process of a manufacturing company. The transition from the manual process to the new semi-automated assembly line is composed of 4 main steps: the as-is analysis, the Process reengineering and layout design, the training and finally the mass production. The study has shown that the line automation yields significant improvements: sizeable increase of the workstations saturation, better cohesion with Just in Time principles, reduction of the employed working force, and increase of the quality control process rigor. The scope of the study was limited to one of the firm assembly line. In future, the company plans to perform similar studies on the other lines. This investigation shows significant benefit associated with a structured implementation automation in the field of assembly process. The findings will mainly be relevant for process and logistics managers involved in the planning of a new assembly line or in the redesign of an existing one. This paper provides an original case study of as-is analysis, re-design, training and testing of an improved assembly line.
{"title":"The automation of an assembly system: A business process re-engineering (BPR) perspective","authors":"M. Bevilacqua, F. Ciarapica, Ilaria De Sanctis, G. Mazzuto, C. Paciarotti","doi":"10.1109/IESM.2015.7380185","DOIUrl":"https://doi.org/10.1109/IESM.2015.7380185","url":null,"abstract":"The purpose of this paper is to automate a manual assembly line following a structured framework, in a motorcyclist industry. Process re-engineering is implemented in order to improve and automate the assembly process of a manufacturing company. The transition from the manual process to the new semi-automated assembly line is composed of 4 main steps: the as-is analysis, the Process reengineering and layout design, the training and finally the mass production. The study has shown that the line automation yields significant improvements: sizeable increase of the workstations saturation, better cohesion with Just in Time principles, reduction of the employed working force, and increase of the quality control process rigor. The scope of the study was limited to one of the firm assembly line. In future, the company plans to perform similar studies on the other lines. This investigation shows significant benefit associated with a structured implementation automation in the field of assembly process. The findings will mainly be relevant for process and logistics managers involved in the planning of a new assembly line or in the redesign of an existing one. This paper provides an original case study of as-is analysis, re-design, training and testing of an improved assembly line.","PeriodicalId":308675,"journal":{"name":"2015 International Conference on Industrial Engineering and Systems Management (IESM)","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126921419","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-10-01DOI: 10.1109/IESM.2015.7380326
Dan Zheng, Hong Zheng, Dongni Li, Miao Li
Intercell transfers make the idea of creating independent cells in cellular manufacturing systems impossible, but are essential for enterprises to reduce the costs. Because intercell transportation in the equipment manufacturing industry cannot be neglected, the problem of intercell scheduling with a limited transportation capacity constraint, which is essentially the integration of part scheduling and transportation, is addressed in this paper. An artificial bee colony (ABC) with aging leader in the elite group (ALEG) approach is proposed. Different from the basic ABC algorithm, a leading mechanism, namely ALEG is used in the onlooker bee phase, which provides the colony with more opportunities to search in promising regions. Aiming at minimizing the total weighted tardiness, the experiment is conducted by applying two leading mechanisms, i.e., ALEG and the one proposed in the previous study, to ABC, respectively. Computational results show that the proposed approach is better than the latter one.
{"title":"An artificial bee colony with aging leader in the elite group approach for intercell scheduling considering transportation capacity","authors":"Dan Zheng, Hong Zheng, Dongni Li, Miao Li","doi":"10.1109/IESM.2015.7380326","DOIUrl":"https://doi.org/10.1109/IESM.2015.7380326","url":null,"abstract":"Intercell transfers make the idea of creating independent cells in cellular manufacturing systems impossible, but are essential for enterprises to reduce the costs. Because intercell transportation in the equipment manufacturing industry cannot be neglected, the problem of intercell scheduling with a limited transportation capacity constraint, which is essentially the integration of part scheduling and transportation, is addressed in this paper. An artificial bee colony (ABC) with aging leader in the elite group (ALEG) approach is proposed. Different from the basic ABC algorithm, a leading mechanism, namely ALEG is used in the onlooker bee phase, which provides the colony with more opportunities to search in promising regions. Aiming at minimizing the total weighted tardiness, the experiment is conducted by applying two leading mechanisms, i.e., ALEG and the one proposed in the previous study, to ABC, respectively. Computational results show that the proposed approach is better than the latter one.","PeriodicalId":308675,"journal":{"name":"2015 International Conference on Industrial Engineering and Systems Management (IESM)","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127032811","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-10-01DOI: 10.1109/IESM.2015.7380300
M. Bahroun, S. Harbi
In today's increasingly risky and uncertain business and industrial environments, supply chains need to be more flexible and more robust to improve their performance. During the last decade supply chain risk management has emerged as a challenge on the strategic and operational supply chain issues. A deeply analysis of a case study has revealed that modern retail industry needs decision support tools to manage supply chain risks. These tools should cope with emerging practices and integrate many categories of risks. Of course, it has to be understood that risks can differ from one sector to another and from one supply chain to another and one country to another. In this paper we present preliminary research concepts and findings concerning the identification, the analysis and the modeling of risks in the modern retail supply chains. We propose a new framework for categorizing the risks in order to assess the overall impact on the performance of the retail supply chain. These risks were selected based on the literature review and on a case study of a leading retail company in Tunisia. Review of the literature on supply chain risk modeling techniques are presented and discussed. The paper concludes with numerical analysis of supply risk and comments on opportunities for further research on the area of supply chain risk and performance trade-off.
{"title":"Risk management in the modern retail supply chain: Lessons from a case study and literature review","authors":"M. Bahroun, S. Harbi","doi":"10.1109/IESM.2015.7380300","DOIUrl":"https://doi.org/10.1109/IESM.2015.7380300","url":null,"abstract":"In today's increasingly risky and uncertain business and industrial environments, supply chains need to be more flexible and more robust to improve their performance. During the last decade supply chain risk management has emerged as a challenge on the strategic and operational supply chain issues. A deeply analysis of a case study has revealed that modern retail industry needs decision support tools to manage supply chain risks. These tools should cope with emerging practices and integrate many categories of risks. Of course, it has to be understood that risks can differ from one sector to another and from one supply chain to another and one country to another. In this paper we present preliminary research concepts and findings concerning the identification, the analysis and the modeling of risks in the modern retail supply chains. We propose a new framework for categorizing the risks in order to assess the overall impact on the performance of the retail supply chain. These risks were selected based on the literature review and on a case study of a leading retail company in Tunisia. Review of the literature on supply chain risk modeling techniques are presented and discussed. The paper concludes with numerical analysis of supply risk and comments on opportunities for further research on the area of supply chain risk and performance trade-off.","PeriodicalId":308675,"journal":{"name":"2015 International Conference on Industrial Engineering and Systems Management (IESM)","volume":"92 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127056934","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-10-01DOI: 10.1109/IESM.2015.7380276
D. Horla, A. Owczarkowski
The paper presents analysis of two control strategies, i.e. LQR and LQI, in application to control of continuous-time nonlinear system on the basis of its linearised discrete-time model, taking robustness approach into account. The applied control laws assure robustness subject to actuator failure what has been used to obtain better control quality (in the sense of selected performance indexes) in comparison to control laws that take no uncertainty into account. The uncertainty resembles here actuator failure or mismodeling case, whenever applied control signal results in different behaviour of the closed-loop system than desired, as in actuator failure case alone.
{"title":"Robust LQR with actuator failure control strategies for 4DoF model of unmanned bicycle robot stabilised by inertial wheel","authors":"D. Horla, A. Owczarkowski","doi":"10.1109/IESM.2015.7380276","DOIUrl":"https://doi.org/10.1109/IESM.2015.7380276","url":null,"abstract":"The paper presents analysis of two control strategies, i.e. LQR and LQI, in application to control of continuous-time nonlinear system on the basis of its linearised discrete-time model, taking robustness approach into account. The applied control laws assure robustness subject to actuator failure what has been used to obtain better control quality (in the sense of selected performance indexes) in comparison to control laws that take no uncertainty into account. The uncertainty resembles here actuator failure or mismodeling case, whenever applied control signal results in different behaviour of the closed-loop system than desired, as in actuator failure case alone.","PeriodicalId":308675,"journal":{"name":"2015 International Conference on Industrial Engineering and Systems Management (IESM)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126724228","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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