We consider a class of optimal stopping problems where the ability to stop depends on exogenous Poisson signal process – one can only stop at the Poisson jump times. Even though the time variable in these problems has a discrete aspect, a variational inequality can be obtained by considering an underlying continuous time structure. Depending on whether stopping is allowed at t = 0, the value fu...

The paper considers the problem of minimizing the energy used to transmit packets over a wireless link via lazy schedules that judiciously vary packet transmission times. The problem is motivated by the following observation. With many channel coding schemes, the energy required to transmit a packet can be significantly reduced by lowering transmission power and code rate, and therefore transmi...

Most bus transit systems only offer direct service between a small fraction of the origin/destination pairs that they serve. As a consequence, many travelers must transfer between bus lines to complete their journey. In this paper schedule control policies are created to minimize transfer time under stochastic conditions. We determine how long a bus should be held at a transfer stop in anticipa...

A firm receives orders that will be required at an uncertain time given by an Erlang distribution, and over time observes the associated independent exponential events. The firm, in turn, places orders at a linear cost from a supplier with fixed lead time l and has the option of converting (expediting) each order, at a cost, over a certain time interval after the order is originally placed. A c...

Inspections have been shown to be an effective means of detecting defects early on in the software development life cycle. However, they are not always successful or beneficial as they are affected by a number of technical and managerial factors. One important aspect is to understand what are the factors that affect inspection effectiveness (the rate of detected defects) in a given environment,...

This paper introduces a Weibull hazard model formulated by the aggregated Markov method to forecast the expected life length of highway facilities and equipments and the inspection/replacement processes of tunnel lighting systems. First, the paper focuses on presenting a methodology to overcome the estimation bias issues caused by the incompleteness of the data set due to the lack of full life ...

In this paper few edge detection techniques viz. Optimal & Template Based are compared to inspect the over and under fill liquid level of bottle in machine vision system. The text represents the steps and approaches for the inspection of over and under filled level in the bottle which would not only be helpful for quality inspection but in précised time too using different edge detection techni...

Field inspection is one of the core operations of municipalities. There are over ten types of field inspection in a typical municipality, including inspection of building, road digging, food sales, food processing services, ad signs, malls, city development projects, cattle slaughterhouses, lodging services, and the inspection team itself. Inspection activities are carried out either periodical...