جستجوی مقالات مرتبط با کلیدواژه « Collaboration » در نشریات گروه « فنی و مهندسی »

The success of PPP projects depends on various factors. The main concern is to develop an underlying theoretical model of desirable collaboration in freeway projects in Iran. In this research, antecedents and consequences of collaboration have been extracted. In order to conduct the research, the multi-case study method has been used to collect data and the Grounded Theory has been applied to analyze them. Then, the theoretical model of collaboration between the public sector and the private sector has been presented. According to the research findings, the collaboration phenomenon in this type of partnership is defined by collaboration categories, such as providing resources, project definition, facilitating bureaucratic processes, legal, risk sharing, meeting benefits, stakeholder management, upgrading new construction methods, and information sharing. The causal antecedents for collaboration include: characteristics of the public and private sectors, joint decision making, trust, commitment, members’ believe in the benefits of collaboration, and process/structure. The categories of financing system, macro-economy, administrative system, trade union interaction, sanctions, maturity of rules, and government meritocracy were also identified as the contextual factors for collaboration. Finally, the consequences of collaboration were identified as efficiency, innovation, satisfaction, benefits of parties, and willingness to invest in the future.

This research proposes a multi-objective and robust model considering both cost and risks related to the environment (water consumption and environmental pollution), social responsibility (working conditions and employee health), operations (change in demand and return rates), and disruption (accs and diseases such as COVID-19) in the supply chain, using horizontal collaboration to deal with it.

In this research, mixed-integer linear programming and robust optimization technique have been used for closed-loop supply chain network design and a multi-objective method has been developed to solve the problem and create Pareto spaces.

The results of the calculations show the effect of failure probability on the capacity of the facility, the total cost of the network and the degree of collaboration between members of the supply chain to deal with the risk. Also, the amount of cost required for allocation to reliable and unreliable facilities and also creating a suitable Pareto space for deciding on the optimal choice of facilities, capacity and flow between them and iron and steel production technology, according to sustainability and social responsibility indicators, are other research findings.

Originality/Value:

 In this study, for the first time, the design of a robust, sustainable, and resilient network of iron and steel under different risks has been studied. Horizontal collaboration has been used as a new approach to deal with risk and solution method for multi-objective problems has been developed. Using the results of this study, the decision-maker can make informed decisions about the supply chain under risk conditions by considering suitability for each of the objectives.

The present study aims at presenting the pathological model of the process of collaboration between the public and nongovernmental sectors as one of the key factors affecting project performance utilizing multi-case research method as well as the grounded theory for data analysis. This research tries to find quality partnerships for implementing projects that are delivered by BOT. These drivers will include the causal conditions, structures, processes, and mechanisms of actors involved in public-private partnerships. In this regard, at first step, by reviewing the literature, the approach of developed and developing countries, and the way, in which, the parties engage in different contexts are investigated.Then, the required data is collected to be used in the grounded theory by referring to the successful and unsuccessful cases in collaboration between the governmental and nongovernmental sections, and conducting interviews with different individuals from different levels of management from both sectors, attending meetings of the committee of investment companies in the construction of Iranian freeways and memorization from our observations of how the dialogue, behavior and interaction of the parties. Then, by analyzing the acquired data, the Pathology Model of the collaborative process between public sector and non-governmental sector in BOT freeway projects is developed.According the obtained results in this study, the lack of respect, risk coverage, and joint decision making constitute the phenomenon of undesirable partnership. Finally, while comparing this research findings with those existing in the literature, executive suggestions are made to reduce challenges and promote existing collaborative efforts.

Optimal collaboration of the partners in a project is identified as one of its success factors. Presentation of the theory/the model of the optimal collaboration in the private sector with the public sector in Iran's freeway projects is the main concern of this research. In this study, while trying to scrutinize the concept of collaboration and identify the various dimensions of this phenomenon, the factors contributing to the optimal collaboration and its outcomes will be investigated. To this end, the case study research method is used to collect data and the grounded theory is utilized to analyze data. After analyzing the data, by selecting an appropriate model, the main categories associated with the phenomenon are identified. In this research, private sector investment in BOT projects was considered. Therefore, a critical review of the research literature was carried out at the first step. Then, by referring to a partnership with different actors, different levels of responsibility are interviewed from both public and private sectors. Then, the data from the speech, the behavior and cooperation of the parties to the partnership are gathered at the meetings of the committee of the investment companies. In the following, the data are analyzed and the theoretical model of collaboration is presented. According to the obtained results of this research, the capability of the private sector, capital security, stakeholder engagement, contract, government managers' competence, risk sharing, and joint decision-making are identified as the factors affecting the optimal collaboration. Besides, the completion of the project with the appropriate cost, time and quality, the achievement of the public sector benefits, the private sector financial profit, the satisfaction of the private sector, and the promotion of the public sector's belief in engagement with the private sector as the result of optimal collaboration between the parties are identified.

In the last two decades, many researchers have focused on the problem of automation of vehicles, and many research has been devoted to solving the challenges posed by this area. One of the important aspects in this area is the problem of localizing the vehicle and mapping the environment simultaneously in an unknown environment, which is briefly referred to as SLAM. So far, many methods have been proposed to solve this problem, but few of these researches have been implemented on the platform of collaborative robots. In this paper, SLAM problem is extended to multi robot platform by employing extended kalman filter. Due to lack of knowledge about the measurement noise covariance, the elements of this matrix adapted according to the actual data received from the sensor by employing particle swarm optimization technique. Then, to solve this problem in the dynamic environment, probability hypothesis density filter is used to track the dynamic objects in the field of view of sensors. Finally, the performance of the algorithm is evaluated in a MATLAB environment.