Technology cycles in the computer peripherals sector: a test of the demand heterogeneity theory

This study set out to test the claims of demand heterogeneity theory (Adner & Levinthal, 2001) regarding the dynamics of demand cycles in the personal computers graphics cards sector. The demand heterogeneity theory claims that technology firms continue to engage in product innovation in mature product classes and offer products featuring increasing performance at stable prices. Adner and Levinthal (2001) posit that the answer to this phenomenon lies in the demand context: technology that meets consumers' functionality and net utility thresholds leads to the emergence of technologically satisfied consumers. In the face of satiated technological needs, firms engage in product differentiation strategies and continued innovation due to fierce competition for technologically satisfied consumers. The consumers in turn enjoy additional functional benefits and luxurious bargains. The theory is based on mathematical modeling and remains empirically untested in the management science literature.

Technology cycles in the computer peripherals sector: a test of the demand heterogeneity theory

This study set out to test the claims of demand heterogeneity theory (Adner & Levinthal, 2001) regarding the dynamics of demand cycles in the personal computers graphics cards sector. The demand heterogeneity theory claims that technology firms continue to engage in product innovation in mature product classes and offer products featuring increasing performance at stable prices. Adner and Levinthal (2001) posit that the answer to this phenomenon lies in the demand context: technology that meets consumers' functionality and net utility thresholds leads to the emergence of technologically satisfied consumers. In the face of satiated technological needs, firms engage in product differentiation strategies and continued innovation due to fierce competition for technologically satisfied consumers. The consumers in turn enjoy additional functional benefits and luxurious bargains. The theory is based on mathematical modeling and remains empirically untested in the management science literature.

The predictive value of serial serum estradiol and serial endometrial volume on endometrial receptivity on assisted reproductive technology cycles

Background Diagnosis of endometrial receptivity is still unclear and conflicting. Despite advances in embryo development during assisted reproductive technologies (ART) cycles, the intricate process of implantation is still matter for debate and research. Materials and methods Prospective case control of 169 subjects during ovarian controlled stimulation for ART. Endometrial receptivity assessment to predict clinical pregnancy with serial continuous biochemical (serum estradiol) and biophysical (endometrial volume and adjusted endometrial volume) parameters were used. Both parameters were compared between negative and positive outcome in terms of clinical pregnancy. Results No statistical difference was noted between the two groups in terms of demographics and ART procedures and scores. Serum estradiol was significantly higher in the positive group from day 8 after ovarian controlled stimulation. Endometrial volume and adjusted endometrial volume were significantly higher in the positive group as soon as day 6 of ovarian controlled stimulation. Conclusions Continuous serum estradiol and 3D endometrial volume and adjusted endometrial volumes may reflect endometrial changes during ART procedures and provide a useful real time tool for clinicians in predicting endometrial receptivity.