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노정현,민준원,명나혜,김유미 대한영상의학회 2018 대한영상의학회지 Vol.78 No.5
Dermatofibrosarcoma protuberans (DFSP) is a rare, malignant soft tissue tumor. It arises from the dermis, however, a few lesions are known to infiltrate into deeper layers. It commonly occurs on the trunk and extremities, but rarely involves the breast. We report a case of a 43-year-old woman who had histologically proven DFSP of the breast, with emphasis on ultrasonographic findings and pathological features. In our case, the ultrasonographic features of DFSP revealed an ovalshaped hypoechoic mass in the dermis of left breast with surrounded by increased levels of echogenic subcutaneous fat. This ultrasonographic finding correlated with pathologic features of infiltration of tumor cells into the subcutaneous fat. No previous study reported this feature of DFSP associated with the breast.
고속도로 이용차량에 대한 통행분포 모형의 적합성 연구- 중력모형과 간섭기회 모형의 비교 -
노정현,김재진,김태균 국토연구원 2005 국토연구 Vol.45 No.-
The gravity models including the entropy maximization model has been applied to almost every trip distribution analyses between regions not only in passenger trips but also in freight movements. In this study, the gravity model and the intervening opportunity model are theoretically compared and empirically examined using TCS(Toll Collecting System) data of Korean Express Highway Company to show the suitability of the models. As a result, the intervening opportunity model is more suitable than the entropy maximization type gravity model in case of heavy truck movements which are usually used for long-distance shipment. This means that long-distance vehicular movements are influenced much more by the opportunities, which reflect the social and economic attractiveness, allowed in destination than by the travel costs to destination. In conclusion, this study suggests that different types of trip distribution models should be applied to estimate the interregional movements of heavy trucks and passenger vehicles.