Entity

Time filter

Source Type

Niigata-shi, Japan

Niigata University of International and Information Studies is a private university in Niigata, Niigata, Japan. It was established in 1994. Wikipedia.


Shirai K.,Niigata University of International and Information Studies | Amano Y.,Kyohnan Elecs co.
International Journal of Innovative Computing, Information and Control | Year: 2014

We analyze a production process based on the nonlinearity of the rate of return on sales. The mathematical model leads to a van der Pol differential equation. We propose a stochastic field that is analogous to the mechanical field of physics. In the stochastic field of a production process with nonlinear characteristics, we clarify the condition that yields a stable cyclic solution using cost parameters and nonlinear characteristics parameters. We consider that overcoming the nonlinearity of production will lead to improved productivity. In a real production process, we introduce a case of throughput improvement by implementing a recombination of the process. © 2014 ISSN 1349-4198.


Shirai K.,Niigata University of International and Information Studies | Amano Y.,Kyohnan Elecs co.
IEEJ Transactions on Electronics, Information and Systems | Year: 2012

When we call the production flow to transition elements in the next step in the process of product manufactured one, the production flow is considered to be displaced in the direction of the unit production density. Density and production, as captured from different perspectives, also said production costs per unit of production. However, it is assumed that contributed to the production cost of manufacturing 100 percent. They may not correspond to the physical propagation conditions after each step of the production density, the equations governing the manufacturing process, which is intended to be represented by a single diffusion equation. We can also apply the concept of energy levels in statistical mechanics, production density function, in other words, in statistical mechanics "place" that if you use the world of manufacturing and production term. If the free energy in this production (potential) that are consuming the substance is nothing but the entropy production. That is, productivity is defined as the entropy production has to be. Normally, when we increase the number of production units, the product nears completion at year-end number of units completed and will aim to be delivered to the contractor from the turnover order. However, if you stop at any number of units, that will increase production density over time. Thus, the diffusion does not proceed from that would be irreversible. In other words, the congestion will occur in production. This fact and to report the results of analysis based on real data. © 2012 The Institute of Electrical Engineers of Japan.


Shirai K.,Niigata University of International and Information Studies | Amano Y.,Kyohnan Elecs co.
IEEJ Transactions on Electronics, Information and Systems | Year: 2012

In this present paper, we apply a stochastic differential equation(SDE) for mathematical model which describes manufacturing process from input materials to an end of manufacturing process. We utilize a risk-neutral principal in stochastic calculus based on the SDE. We extend the mathematical model to allow for objective evaluation. In order to improve a lead-time in manufacturing process, we introduce a evaluation equation which satisfy a certain compatibility constraint with lead-time. A certain compatibility constraint with lead-time means a strategy, that is, "Cut off irrelevant process in entire process, and Bring back its improved the process". It is assumed that the probability density function of log-normal type which is a probability density function from input materials to an end of process. This present paper evaluate a certain compatibility constraint with lead-time by applying the risk neutrality and martingale measure of stochastic integral under this assumption. After its evaluation value calculated by a evaluation equation, a process control system evaluates the each subprocess, and reschedules to improve the utilization efficiency of the entire manufacturing process. Thus, a front-end-process is to cancel the request to the process, and follows the instructions on the process control systems. But, this present paper gives only simulation evaluation calculated the parameter, the paper does not discuss a compatibility between a evaluation value of calculated manufacturing lead-time compatibility constraint and a the real system. However, this present paper gives a idea to search bottleneck sub-process in the manufacturing process, and gives a idea of software tool for process synchronization. © 2012 The Institute of Electrical Engineers of Japan.


Shirai K.,Niigata University of International and Information Studies | Amano Y.,Kyohnan Elecs co.
International Journal of Innovative Computing, Information and Control | Year: 2014

We clarify the self-similarity of fluctuations in a supply chain system and present a size-independent mathematical model of a supply chain system using Langevintype stochastic differential equations. As numerical examples, we provide density spectra (criteria of synchronization processes) for a given frequency ranges (lead time). The self-similarity of fluctuations is given by the function of throughput deviations within the process. We also demonstrate that for this supply chain system, when the time constant of the time correlation function possesses a uniform Poisson distribution, the system exhibits f-1 fluctuation and when this time constant possesses a uniform distribution, the system exhibits f-2 fluctuation. Furthermore, the supply chain system has a Lorentzian spectrum under the condition of fluctuations having spectral density. We also verify the self-similarity in the supply chain system. The probability distribution of cost rate based on the lead time exhibits a normal distribution. Furthermore, the probability distribution for the absolute value of the cost rate deviation based on the lead time exhibits a power-law distribution. Finally, regarding the management strategy to be taken by the manufacturer, we propose that profit can be increased when adopting a strategy that purposefully leads to a state of excessive production or one of excessive order entries. © 2014 ICIC International.


Shirai K.,Niigata University of International and Information Studies | Amano Y.,Kyohnan Elecs co. | Omatu S.,Osaka Institute of Technology
International Journal of Innovative Computing, Information and Control | Year: 2013

In order to analyze a manufacturing process, the present paper makes discussion from a physical point of view, not from a conventional management engineering point of view. That is, an idea of a production level corresponding to an energy level being discussed in physics is introduced. When information needed over a whole manufacturing process period is not available 100, an expected value and variance of throughput of the whole process period is estimated by utilizing Kalman filter theory having been used for a state estimation problem in the control theory. Process throughput is evaluated by taking an estimated expected value and variance of a throughput rate as an evaluation criterion, and a cash flow proportional to a manufacturing period as an evaluated value. Finally, a result of numerical value simulation of process throughput evaluation is shown. © 2013 ICIC International.

Discover hidden collaborations