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양해원,장충현,강민구 대한두개안면성형외과학회 2009 Archives of Craniofacial Surgery Vol.10 No.1
Purpose: Langerhans cell histiocytosis is a heterogenous group of Langerhans cell proliferative disorders and includes eosinophilic granuloma, Letterer-Siwe diseases, and Hand- Schuller Christian disease. We report a case of eosinophilic granuloma on frontal area. Methods: A 17-year-old male presented with swelling and tenderness on Lt. frontal and periorbital area. CT and MRI showed a 33 × 25 mm sized mass that involved Lt. frontal calvarium, frontotemporal meninges, and orbital roof. Results: Total excision of the mass and adjacent soft tissue, calvarium, and orbital roof was performed. Orbital roof defect was reconstructed with absorbable plate and calvarial defect was done with outer cortex of temporal bone flap. The histology revealed proliferation of histiocytes and eosinophils. Immunologically, these histiocytic cells expressed S-100 protein and CD1a. The patient is currently taking conservative treatment. Conclusion: The severity of these disease and their prognosis and treatments are various. For unifocal cranial Langerhans cell histiocytosis, complete excision is the treatment of choice. We report this case with review of literature.
양해원 대한전기학회 1987 전기의 세계 Vol.36 No.7
본고에서는 현재까지 확립된 적응제어의 설계이론 특히 기준모델형 적응제어에 중점을 두고 소개하였으며, 최근에 활발하게 연구가 진행되고 있는 강인성(robustness)해석 및 개선 즉 위에서 언급한 제약을 풀어 나가기 위한 시도들의 일부에 대하여 기술하였다.