Dynamics of General Purpose Technologies in an Open Economy

While the Helpman-Trajtenberg model is successful in explaining the macroeconomic cycle generated by GPT in the context of a closed economy, open-economy implications regarding GPT have received scant attention. We seek to fill such void in the previous literature by developing a dynamic North-South trade model with GPT. Our major findings are : 1) the introduction of GPT causes a product cycle from the North to the South followed by a reverse product cycle from the South to the North; 2) the presence of trading partner can cushion the macroeconomic shock experienced by the North.Open Economy, General Purpose Technologies, Trade Pattern, Real GDP Growth

FDI and Technology Spillovers in China

Using a database of Chinese firms, we examine the effects of technology spillovers not only between foreign entrants and local firms but also between "modernized" local firms to other local firms. Our results show that the increased presence of foreign multinationals within industries and in their upstream sectors positively affected the productivity of local firms. The positive intra-industry spillover effect from wholly owned subsidiaries becomes evident when the Chinese government's restriction on foreign ownership was lifted. We also find strong spillover effects among local firms.foreign direct investment, spillover effects, China

Monoblock Craniofacial Internal Distraction in a Child with Pfeiffer Syndrome: A Case Report

A 7-yr-old boy visited our surgical center with Pfeiffer syndrome type 1, presenting with macrocrania, broad big toe and thumb, exophthalmos, tongue protrusion, malocclusion with midfacial retrusion, mild respiratory difficulty due to minor upper airway obstruction, and developmental delay. He also exhibited anthrophobia with a passive character. The patient was treated with internal monoblock distraction osteogenesis to increase the intracranial and intraorbital volumes, and the nasal and pharyngeal airway spaces using two modular mid-facial internal distractors. For distraction, the latency period was 1 week, the daily activation of 1.0 mm was 20 days (total advancement 20 mm at the midline), and the consolidation period was 3 months. The follow-up computed tomography 12 months after surgery showed expansion of the brain and proper ossification in the distracted area. The patient also showed aesthetically good cranial contours, improved tongue and eyeball protrusion, no respiratory difficulty, and improved learning. We suggest that the internal distraction may last longer than an external type, resulting in a better bone fusion rate and successful expansion of craniofacial bones

A Case of Pfeiffer Syndrome

Pfeiffer Syndrome is as rare as Apert syndrome in the Western population. This condition is very rare in the Asian population and has not been previously reported in Korea. The authors report with a review of literature the case of a newborn baby with Pfeiffer syndrome, manifested by bicoronal craniosynostosis, broad thumbs, and big toes. The infant also had bilateral syndactyly of the fingers and toes, mild proptosis, choanal hypoplasia and maxillary hypoplasia

Dynamics of General Purpose Technologies in an Open Economy

While the Helpman-Trajtenberg model is successful in explaining the macroeconomic cycle generated by GPT in the context of a closed economy, open-economy implications regarding GPT have received scant attention. We seek to fill such void in the previous literature by developing a dynamic North-South trade model with GPT. Our major findings are : 1) the introduction of GPT causes a product cycle from the North to the South followed by a reverse product cycle from the South to the North; 2) the presence of trading partner can cushion the macroeconomic shock experienced by the North