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황기태(Hwang, Kee-Tae),장극관(Chang, Kug-Kwan),서대원(Seo, Dae-Won) 대한건축학회 2012 大韓建築學會論文集 : 構造系 Vol.28 No.7
Access floor is finding increasing use in industrial and commercial facilities such as data processing centers and high technology production. Due to the relatively recent use of access floors, there is little data available on the performance of these structural systems when subjected to strong ground shaking. However, building code in the Korea did not address the seismic design of raised access floors until recently. Most existing floors have been installed without proper consideration for seismic performance. This paper discuss the evaluation methods of seismic performance of access floor system for equipment used in telecommunication facilities, electric power facilities and other applications. Also, this paper presented the test and evaluate the lateral load carrying ability of existing raised access floors and seismically strengthening access floor systems. The tested access floor system was assembled by 5×5 panels with pedestal-stringer frame structure, supporting a simulated equipment with varies weight, the size of the panel is 600×600mm, the height of the pedestal is 600mm. The test results showed that specially designed seismic resistant access floor system can be used to reduce earthquake vulnerability.
황기태(Ki-Tae Hwang),정중기(Jung Kee Chung),정인목(In Mok Jung),허승철(Seung Chul Heo),안영준(Young Joon Ahn),안혜성(Hye Seong Ahn),장미수(Mee Soo Chang),김병재(Byung-Jae Kim) 대한외과학회 2010 Annals of Surgical Treatment and Research(ASRT) Vol.79 No.6
Dermatofibrosarcoma protuberans is a rare tumor that occurs in the dermis or subcutaneous tissue of the trunk or extremities in relatively young adults. There are few reports of Dermatofibrosarcoma protuberans associated with pregnancy. We experienced a 28-year-old pregnant female patient with an abdominal wall mass, which grew rapidly during pregnancy. Excisional biopsy was performed and the pathologic diagnosis was fibrosarcoma transformed from Dermatofibrosarcoma protuberans. Dermatofibrosarcoma protuberans showed a positive CD34 immunostaining while fibrosarcoma showed a negative CD34. There was no recurrence or metastasis with the follow up period of 2 years. We report here a rare case of Dermatofibrosarcoma protuberans aggravated during pregnancy with a review of the literature.
부신 종양으로 오인된 일차성 후복막 악성 위장관 기질성 종양
황기태(Ki-Tae Hwang),정중기(Jung Kee Chung),정인목(In Mok Jung),허승철(Seung Chul Heo),안영준(Young Joon Ahn),안혜성(Hye Seong Ahn),장미수(Mee Soo Chang) 대한외과학회 2009 Annals of Surgical Treatment and Research(ASRT) Vol.77 No.5
Gastrointestinal stromal tumor (GIST) is the most common non-epithelial tumor in the gastrointestinal tract. Although GIST occurs mainly in the gastrointestinal tract, it also occurs, rarely, in non-gastrointestinal tract and in this case, it is often named as extra-gastrointestinal stromal tumor (EGIST). We experienced a 68-year-old male patient who had been diagnosed preoperatively with accidentaloma of the left adrenal gland by computed tomography, and finally diagnosed as primary retroperitoneal malignant GIST, postoperatively. The operation was performed via anterior abdominal approach, and complete surgical resection was done for a 7 ㎝ sized retroperitoneal tumor near the left adrenal gland. Primary retroperitoneal malignant GIST was the final pathologic diagnosis and the size of the tumor was 6.5 ㎝ and the mitotic count was 7 per high-power field. Diffuse strong positive staining for c-kit protein, CD34 and negative staining for desmin were observed in a immunohistochemistry test. We report here the unusual case of primary retroperitoneal malignant GIST mimicking adrenal mass.
황기태(Ki-Tae Hwang),정중기(Jung Kee Chung),정인목(In Mok Jung),허승철(Seung Chul Heo),안영준(Young Joon Ahn),장미수(Mee Soo Chang) 대한외과학회 2009 Annals of Surgical Treatment and Research(ASRT) Vol.77 No.3
Obturator hernia is a rare type of pelvic hernia and occurs most commonly in elderly and debilitated women. It is still a challenge for surgeons to diagnose precisely in early stages because of its nonspecific symptoms and consequently delayed diagnosis could lead to high morbidity and mortality. We experienced a 92-year old patient who was diagnosed as obturator hernia which was confirmed by computed tomography scan of the abdomen and pelvis. The operation was delayed due to the refusal of family members but eventually done after 12 days from initial diagnosis. After manual reduction of small bowel impacted into right obturator foramen, segmental resection of impacted small bowel and anastomosis was done. The hernial defect was closed by primary closure with Dexon suture material. After the operation, the patient was discharged without significant complications. We report here successful results of delayed operation for obturator hernia.