Abstract: A calculator calculates, using a model of a process relating to water treatment, an output variable including an effluent water quality indicating a quality of effluent water flowing out of the process based on input variables including an influent water quality indicating a quality of influent water flowing into the process and a manipulated value for the process. The calculator acquires a combination satisfying a predetermined constraint condition among combinations of the manipulated value and the output variable. A controller controls the process based on the manipulated value in the combination acquired by the calculator.

Abstract: An operational improvement effect calculation method includes: retrieving, from inputted plant operation data relating to operations of a plant, comparison target plant operation data which includes more than one plant operation data points similar to a plant operation indicated by evaluation target plant operation data which is plant operation data of an evaluation target; calculating a post-improvement evaluation indicator based on the evaluation target plant operation data and a pre-improvement evaluation indicator based on each of the comparison target plant operation data; calculating a confidence interval, based on each data point of the comparison target plant operation data; calculating a baseline, which is a reference when comparing the post-improvement evaluation indicator and the pre-improvement evaluation indicator and corresponds to the pre-improvement evaluation indicator, based on the confidence interval; and calculating an evaluation result on the plant, based on the post-improvement evaluatio

Abstract: An operation plan decision method includes deriving an feasible solution by using a constraint violation minimization model, updating candidates for an optimum solution and adding the updated candidates to a candidate list by taking the derived feasible solution, as an initial value of a candidate for the optimum solution, and by using a time cross-section division model that is obtained by dividing an optimization model for each time cross-section, and selecting the optimum solution from the candidate list to which the updated candidates are added.

Abstract: An operation plan decision method includes deriving an feasible solution by using a constraint violation minimization model, updating candidates for an optimum solution and adding the updated candidates to a candidate list by taking the derived feasible solution, as an initial value of a candidate for the optimum solution, and by using a time cross-section division model that is obtained by dividing an optimization model for each time cross-section, and selecting the optimum solution from the candidate list to which the updated candidates are added.

Abstract: Provided is an energy management method using estimate models which correspond to each of a plurality of targets of energy management and which estimate energy consumption and/or energy conversion as the respective targets of energy management are activated. The estimate models are subdivided to correspond to each of a plurality of statuses of the targets of energy management, transitioning upon a temporal axis as the targets of energy management are activated.