a deterioration and the consequent status of feeblemindedness, this child must receive treatment different from that given the entirely normal individual. The mentality, both functional and structural, must be determined by an analysis which will reveal the phases where special training is required by the child. This analysis is made by the use of well defined and carefully administered tests. ...

In this study we consider the single machine scheduling problems with sum-of-logarithmprocessing-times based deterioration, i.e., the actual job processing time is a function of the sum of the logarithm of the processing times of the jobs already processed. We show that even with the introduction of the sum-of-logarithm-processing-times based deterioration to job processing times, single machin...

Iron loss is a possible source of performance deterioration, especially for a torque regulation, in field oriented induction machine. In this paper, study on the model of an induction machine with iron losses, a flux estimation strategy, the design of direct and indirect field oriented controller, a precise torque regulation scheme and the determination of a core loss resistance are discussed. ...

Although scheduling with deteriorating jobs and learning effect has been widely investigated, scheduling research has seldom considered the two phenomena simultaneously. However, job deterioration and learning co-exist in many realistic scheduling situations. In this paper we introduce a new scheduling model in which both job deterioration and learning exist simultaneously. The actual processin...

This paper considers the impact of inflation on the EPQ model for deteriorating items subject to random machine breakdowns and fixed maintenance period. The demand rate is assumed to be a function of inflation and the demand increase due to inflation. The objective is to determine the optimal production uptime that minimizes the present value of expected total costs per unit time consisting of ...

ON OPTIMAL POLICIES FOR MULTI·REPAIR·TYPE MARKOV MAINTENANCE MODELS Yukio Hatoyama Tokyo Institute of Technology (Received April 6, 1978) This paper treats an extension of an optimal machine maintenance model with Markovian deterioration introduced by Derman. The system consists of an operating machine whose deterioration is Markovian, a finite number of identical spare machines, and several ty...

The first aim of this study was to determine the age group at which marathon performance declines in top male and female runners and to compare that to the runners of average ability. Another aim of this of this study was to examine the age-related yearly decline in marathon performance between age group winners and the average marathon finisher. Data from the New York (NYC), Boston, and Chicag...

Improving operational performance and reducing fuel consumption is increasingly important for shipping companies. Ship degrades over time due to hull propeller fouling; therefore assessing when fouling effects are significant enough warrant cleaning critical. Advancements in onboard data logging systems, combined with machine learning techniques, unlock the potential predict accurately determin...