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황정호,권의용,조남천,Jeong Ho Hwang,Eui Yong Kweon,Nam Chun Cho 대한안과학회 2010 대한안과학회지 Vol.51 No.2
Purpose: To review the management of posterior segment metallic intraocular foreign bodies (IOFB) and to compare the use of an external approach using a large electromagnet and an internal approach using vitrectomy and its tools for their removal. Methods: A retrospective review was performed on 49 eyes of 49 patients who underwent surgical removal of metallic IOFBs with either an internal or an external approach at a single institution between January 2003 and December 2006. We divided 49 eyes into two groups based on the type of approach: 26 external (n=26) and 23 internal (n=23). Visual acuity and the presence of any complications occurring with the two approaches were the main outcome measures studied. Results: Thirty of 49 eyes (61%) showed improvements in visual acuity. When we compared patients treated with an external versus an internal approach, we found no statistically significant difference in regard to visual outcome. Preoperative vitreous hemorrhage and endophthalmitis were more common in the internal approach group. A trend toward a higher rate of reoperation was more common in the external approach group, but they were not statistically significant. Postoperative complications found to be significantly different between the two groups were the rate of postoperative endophthalmitis and retinal detachment, which were more common in the external approach group. Conclusions: Surgical removal of metallic IOFBs results in significant visual improvement regardless of the approach method. The internal approach by vitrectomy is recommended as the first choice in preoperative conditions such as severe cataracts, vitreous hemorrhage and endophthalmitis, as well as in groups at high risk for postoperative endophalmitis and retinal detachment. J Korean Ophthalmol Soc 2010;51(2):270-275
황정호 대한기계학회 1994 大韓機械學會誌 Vol.34 No.4
광섬유 모재제조공정인 OVD와 VAD방식에서의 입자부착 증진을 위해서 외부에서 전기장을 가 해서 실리카입자를 대전시킨 뒤에 타겟으로 부착을 시키는 전기영동원리를 이용하는 방법을 소 개하였다. 실험에서는 디스크형 타겟을 사용하여 타겟 근방에서의 온도, 전기장분포를 측정하였고 입자부착실험을 수행했다. 그 결과 9cm 타겟에 -1.6kv가 가해\ulcorner을 때 전기영동으로 인한 부착률 증가는 열영동으로 인한 효과의 약 35%가 되었다.
황정호,박일석,김용복,양재민 대한이비인후과학회 2004 대한이비인후과학회지 두경부외과학 Vol.47 No.6
Carcinoma ex pleomorphic adenoma is a rare neoplasm of the salivary gland. This lesion occurs when a malignant tumor arises in the epithelial component of a pleomorphic adenoma. The patient was a 35-year-old male with ovoid shaped and protruding cytologic finding by fine needle aspiration biopsy showed highly malignant cells. After submandibular gland extirpation and supraomohyoid neck disection, the histologic examination revealed that tumor was composed partly of a benign pleomorphic adenoma and partly of an adenoid cystic carcinoma component with areas of calcification, capsular invasion, and perineural invasion. The adenoid cystic carcinoma component showed a cribriform pattern, also known as Swiss cheese appearance. We adenoid cystic carcinoma in the submandibular gland.
이하선 절제술 후 발생하는 Frey 증후군의 예방에 대한흉쇄유돌근 피판의 유용성
황정호,양재민,홍성광,김범규,박일석,박범정,김용복,노영수 대한이비인후과학회 2005 대한이비인후과학회지 두경부외과학 Vol.48 No.6
Background and Objectives:Frey’s syndrome is one of the potential sequelae of parotidectomy. Various medical and surgical treatments have been used in attempt to avoid this embarrassing condition. Recently, interposing barriers between the overlying skin flap and the parotid bed, such as the sternocleidomastoid (SCM) muscle flap, have been used to prevent this condition. The purpose of this study was to evaluate the preventive impact of using this flap on the incidence of Frey’s syndrome and to identify the degree of severity in this syndrome between the use of SCM flap and no muscle flap. Subjects and Method:40 patients who underwent superficial parotidectomy from June 1996 to August 2003 were divided into two groups. One group had SCM flap reconstruction (n=20), and the other did not (n=20). A subjective clinical questionnaire and the objective Minor’s starch test were used to evaluate the incidence of this syndrome. A grading system was used to divide Frey’s syndrome into mild or severe Frey’s syndrome to determine its severity. The test of Pearson-x2 was applied. Results:The association between sweating, flushing, or pain and the use of the flap was not significant. Also, there was no significant association with Minor’s starch test and the use of the flap. There was a significant association with mild Frey’s syndrome and the presence of the flap (p=0.014). Conclusion:It would seem that the sternocleidomastoid muscle flap does not reduce the incidence of Frey’s syndrome, but does decrease the degree of severity in Frey’s syndrome.