If there is a continuous flow of production jobs for some machines, the problem of flow shop sche... more If there is a continuous flow of production jobs for some machines, the problem of flow shop scheduling arises. As mentioned in many researches, the complexities of this problem are of exponential kind; therefore it is necessary to design less complex methods or algorithms for solving it. In this paper, a new solution is presented for this kind of scheduling problem by using the idea of neural networks. In fact, this research is a response to the need for solving large and complex problems of this type by non-classical methods. The purpose of the paper is to create an artificial intelligence for doing this kind of scheduling via the neural network training process. Here, the neural network has been trained by using training data obtained from optimal sequence of solved problems of flow shop scheduling. The trained network can provide a priority which shows the sequence of the job and will be very close to the optimal sequence.
Purpose – The growing complexity and pace of industrial technological changes are forcing firms t... more Purpose – The growing complexity and pace of industrial technological changes are forcing firms to forge new alliances and to respond more efficiently to the market changes. This process is leading some companies toward more strategic joint integration with others. The development of new engineering-based products is one of the key factors in both corporate and national success. The importance
Transformers are normally designed and built for utilizing at rated frequency and prefect sinusoi... more Transformers are normally designed and built for utilizing at rated frequency and prefect sinusoidal loads. Supplying non-linear loads by transformer leads to higher losses, early fatigue of insulation, and reduction of the useful life of transformer. To prevent these problems rated capacity of transformer supplying non-linear loads must be reduced. In this paper, at first, a useful model of transformer under harmonic condition is presented. The model in addition to ordinary parameters includes a potential difference defined as the second derivative of the load current that represents eddy current losses in windings and the other stray losses represented as a resistor in series with the leakage inductance and dc resistance. Finally, losses and capacity of 50 KVA transformer under harmonic load current is calculated. This model simulated in MATLAB/Simulink and then its results are compared with losses and capacity calculated by standard.
Aircraft Engineering and Aerospace Technology, 2007
Purpose - The main objective of this paper is to develop a knowledge management (KM)approach in I... more Purpose - The main objective of this paper is to develop a knowledge management (KM)approach in Iran aerospace industries based on the findings through the analysis of successful practices in KM area. Design/methodology/approach - A qualitative case study technique has been used in this paper for data collection and analysis. For that, "grounded theory" research approach has been selected by
Purpose – The purpose of this paper is to show that small and medium enterprises (SMEs) play an i... more Purpose – The purpose of this paper is to show that small and medium enterprises (SMEs) play an important role in national economies. Design/methodology/approach – The paper shows that we are experiencing a new kind of economy in recent times known as the “knowledge economy” which considers knowledge as the main resource of organizations for innovation and competitiveness. Findings –
Design/methodology/approach A questionnaire was designed, applied and then analyzed using stati... more Design/methodology/approach A questionnaire was designed, applied and then analyzed using statistical methods. The results discuss various perspectives from the knowledge management point of view, and provide some important findings and a regression model to show the ...
... Allen, M. (2002), A Study to Examine the Future of Turboprop Aircraft, The George Washington ... more ... Allen, M. (2002), A Study to Examine the Future of Turboprop Aircraft, The George Washington University and Back Aviation ... Diakoulakis, I., Georgopoulos, NB, Koulouriotis, DE, Emiris, DM (2004), "Towards a holistic knowledge management model", Journal of Knowledge ...
Aircraft Engineering and Aerospace Technology, 2007
Page 1. Knowledge management in Iran aerospace industries: a study on critical factors Mostafa Ja... more Page 1. Knowledge management in Iran aerospace industries: a study on critical factors Mostafa Jafari, Peyman Akhavan and Jalal Rezaee Nour Department of IndustrialEngineering, Iran University of Science and Technology, Tehran, Iran, and ...
If there is a continuous flow of production jobs for some machines, the problem of flow shop sche... more If there is a continuous flow of production jobs for some machines, the problem of flow shop scheduling arises. As mentioned in many researches, the complexities of this problem are of exponential kind; therefore it is necessary to design less complex methods or algorithms for solving it. In this paper, a new solution is presented for this kind of scheduling problem by using the idea of neural networks. In fact, this research is a response to the need for solving large and complex problems of this type by non-classical methods. The purpose of the paper is to create an artificial intelligence for doing this kind of scheduling via the neural network training process. Here, the neural network has been trained by using training data obtained from optimal sequence of solved problems of flow shop scheduling. The trained network can provide a priority which shows the sequence of the job and will be very close to the optimal sequence.
Purpose – The growing complexity and pace of industrial technological changes are forcing firms t... more Purpose – The growing complexity and pace of industrial technological changes are forcing firms to forge new alliances and to respond more efficiently to the market changes. This process is leading some companies toward more strategic joint integration with others. The development of new engineering-based products is one of the key factors in both corporate and national success. The importance
Transformers are normally designed and built for utilizing at rated frequency and prefect sinusoi... more Transformers are normally designed and built for utilizing at rated frequency and prefect sinusoidal loads. Supplying non-linear loads by transformer leads to higher losses, early fatigue of insulation, and reduction of the useful life of transformer. To prevent these problems rated capacity of transformer supplying non-linear loads must be reduced. In this paper, at first, a useful model of transformer under harmonic condition is presented. The model in addition to ordinary parameters includes a potential difference defined as the second derivative of the load current that represents eddy current losses in windings and the other stray losses represented as a resistor in series with the leakage inductance and dc resistance. Finally, losses and capacity of 50 KVA transformer under harmonic load current is calculated. This model simulated in MATLAB/Simulink and then its results are compared with losses and capacity calculated by standard.
Aircraft Engineering and Aerospace Technology, 2007
Purpose - The main objective of this paper is to develop a knowledge management (KM)approach in I... more Purpose - The main objective of this paper is to develop a knowledge management (KM)approach in Iran aerospace industries based on the findings through the analysis of successful practices in KM area. Design/methodology/approach - A qualitative case study technique has been used in this paper for data collection and analysis. For that, "grounded theory" research approach has been selected by
Purpose – The purpose of this paper is to show that small and medium enterprises (SMEs) play an i... more Purpose – The purpose of this paper is to show that small and medium enterprises (SMEs) play an important role in national economies. Design/methodology/approach – The paper shows that we are experiencing a new kind of economy in recent times known as the “knowledge economy” which considers knowledge as the main resource of organizations for innovation and competitiveness. Findings –
Design/methodology/approach A questionnaire was designed, applied and then analyzed using stati... more Design/methodology/approach A questionnaire was designed, applied and then analyzed using statistical methods. The results discuss various perspectives from the knowledge management point of view, and provide some important findings and a regression model to show the ...
... Allen, M. (2002), A Study to Examine the Future of Turboprop Aircraft, The George Washington ... more ... Allen, M. (2002), A Study to Examine the Future of Turboprop Aircraft, The George Washington University and Back Aviation ... Diakoulakis, I., Georgopoulos, NB, Koulouriotis, DE, Emiris, DM (2004), "Towards a holistic knowledge management model", Journal of Knowledge ...
Aircraft Engineering and Aerospace Technology, 2007
Page 1. Knowledge management in Iran aerospace industries: a study on critical factors Mostafa Ja... more Page 1. Knowledge management in Iran aerospace industries: a study on critical factors Mostafa Jafari, Peyman Akhavan and Jalal Rezaee Nour Department of IndustrialEngineering, Iran University of Science and Technology, Tehran, Iran, and ...
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