The authors develop a framework that incorporates projected profitability of customers in the computation of lifetime duration. Furthermore, the authors identify factors under a manager’s control that explain the variation in the profitable lifetime duration. They also compare other frameworks with the traditional methods such as the recency, frequency, and monetary value framework and past cus...

As reliability based methods gain increased acceptance, there is greater opportunity to use scarce resources more efficiently while maintaining a prescribed level of reliability of a structure throughout its service life. The goal is to provide management decisions that will balance lifetime system reliability and expected lifecycle cost in an optimal manner. This study proposes a system reliab...

In this paper I describe my approach to teaching introductory software engineering, a three-credit upper-level undergraduate course. What I believe is innovative is not the particular concepts or techniques but the way they are woven together, using the unifying concept of dependency management. The specific techniques I teach are the use of interfaces and factory design patterns. Interfaces ar...

Analytical models of object lifetimes are appealing because they would enable mathematical analysis or fast simulation of the memory management behavior of programs. In this paper, we investigate models for object-oriented programs such as Java and Smalltalk. We present analytical models and compare them with observed lifetimes for 58 Smalltalk and Java programs. We find that observed lifetime ...

Object-oriented applications of database systems require database transformations involving non-standard functionalities such as set manipulation and object creation, i.e., the introduction of new domain elements. To deal with these functionalities, Abiteboul and Kanellakis introduced the \determinate" transformations as a generalization of the standard domain-preserving transformations. The ob...

Spatial data types or algebras for database systems should (i) be fully general (which means, closed under set operations, hence e.g. a region value can be a set of polygons with holes), (ii) have formally defined semantics, (iii) be defined in terms of finite representations available in computers, (iv) offer facilities to enforce geometric consistency of related spatial objects, and (v) be in...

Enhanced RFID tag technology especially in the UHF frequency range provides extended functionality like high operating range and sensing and monitoring capabilities. Such functionality requiring extended system structures including data acquisition units, real time clocks and active transmitters causes a high energy consumption of the tag and requires an on board energy store (battery). As a ke...

Reliability analysis of fatigue lifetime design has two assignments: a. To forecast fatigue lifetime of the structure on given reliability level, b. To evaluate reliability level of the structure on given service conditions, material features and designing dimensions. It aims at evaluating the structure’s designing quality and providing a basis for designing improvement or manufacturing. At mea...

In this paper, a special class of redundancy optimization problem with fuzzy random variables is presented. In this model, fuzzy random lifetimes are considered as basic parameters and the Er-expected of system lifetime is used as a major type of system performance. Then a redundancy optimization problem is formulated as a binary integer programming model. Furthermore, illustrative numerical ex...

background : quality management is one of the most effective strategies for improving health system performance in developed and developing countries. this research was a comparative study on quality management models in health system of several countries. the main goal of this study was to identify the most significant dimensions of quality management and propose appropriate model for health s...