The problem of filtering low-frequency trend from a given time series is considered. In order to solve this problem, a nonparametric technique called empirical mode decomposition trend filtering is developed. A key assumption is that the trend is representable as the sum of intrinsic mode functions produced by the empirical mode decomposition (EMD) of the time series. Based on an empirical anal...

The final quarter of the twentieth century has seen the arrival of the claim for educational malpractice, or educational negligence, by students who have failed to learn. Generally speaking, the claim has been that the professional behaviour of teachers, or educational psychologists and/or other providers of educational services has breached the duty of care to educate, with the consequence tha...

We study inventory control for rental operations in a closed-loop supply chain. In such a system (e.g., Netflix), customers create online queues in a service provider’s website to indicate the items that they would like to rent. Leveraging this advance demand information, we propose effective forecast models and formulate a multi-item inventory control problem. We prove that the (L,U) policy is...

innovation has attracted considerable interest in recent years in improving competitive advantage for both profit and nonprofit organizations. service innovation offers the potential for substantially improving the performance, but performance gains are often obstructed by users’ unwillingness to accept and use available systems. this research aims to use the concept of reasoned action theory t...

One of the earliest results in flow shop scheduling theory is an algorithm given by Johnson’s [1] for scheduling jobs on two or three machines to minimize the total elapsed time whenever the processing times of jobs are random. The present paper is an attempt to develop a heuristic algorithm for two stages specially structured flow shop scheduling in which the processing times of the jobs a...

service oriented enterprises (soes) are subject to constant change and variation. in this paper, the changes are considered from an economic perspective based on service culture notion. once a change is implemented, the costs of some member services may increase, whereas the costs of some other services may reduce. we construct a game theoretic model trying to capture the possible conflicting i...

OBJECTIVES Studies have shown that head injuries are the leading cause of death on ski slopes. Statistics on helmet rental practices at ski areas across the United States have never been reported. This study sought to determine the prevalence of United States ski areas offering helmet rental during the 2002-03 ski season. Secondarily it sought to analyze the relationships of geographic region a...