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오형식 한국경영과학회 1986 한국경영과학회지 Vol.11 No.2
The problem of strategic R&D investment is formulated as a differential game model and solved explicitly for a special case. It is shown that, at equilibrium, and increase in the intensity of market competition or a decrease in the role of technology transfer results in an increase in the initial rate of investment by competing firms. The increased initial investment rate may enhance the rat of technology development. This dynamic model can be used to propose non-cooperative R&D investment policies in technologically competitive situations.
오형식,김상희,김길현,이학수,장일환,김지혜 대한소아청소년과학회 2001 Clinical and Experimental Pediatrics (CEP) Vol.44 No.1
The cause of congenital nasal pyriform aperture stenosis is unclear. The development of the facial skeleton occurs between the fifth and the eighth week of gestation. It is at this stage that the stenosis occurs due to overgrowth of the ossification of the maxilla. Infants are obligate nasal breathers. Incomplete and milder forms of nasal airway obstruction may be present with mild respiratory distress, cyanosis, respiratory failure, asphyxia and eventual death. The diagnosis is done by CT, which demonstrates marked narrowing of the nasal inlet. Mild stenosis can be managed conservatively with humidification and topical decongestants but if conservative treatment fails, surgical intervention is candidate. We report a case of congenital nasal pyriform aperture stenosis. The patient, a 2-day old male neonate, had cyanosis during feeding and noisy breathing relieved by crying. His symptoms and signs were improved with surgical intervention without development disturbances. 선천성 비이상구 협착은 비기도 폐쇄를 가지고 있는 환아에서 감별하야만 하며 그것은 독립된 기형이거나 혹은 다른 선천성 기형과 연관될 수도 있다. 만일 내분비기능이 살아있고 다른 선천성 기형이 없다면 환아들의 신경학적 발달은 정상이며, 발달 지체 현상이 있다면 뇌하수체의 기능부전일 수 있다.