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우상욱,김상욱,김정한,남석진,양정현,Sang-Uk Woo,Sang-Wook Kim,Jeong-Han Kim,Seok-Jin Nam,and Jung-Hyun Yang,F,A,C,S 대한갑상선-내분비외과학회 2004 The Koreran journal of Endocrine Surgery Vol.4 No.1
Purpose: Most patients with thyroid cancer have a good prognosis. However, it has been difficult to study a large number of patients succumbing to thyroid carcinoma due to the low mortality rate and the long follow-up period associated with differentiated thyroid cancer. Therefore, we evaluated characteristics of metastasis and deaths, sites of metastasis, difference of survival from pathologic classification and treatments and the cause of deaths. Methods: From June 1995 to December 2003, fifty-four patients who died due to distant metastasis and recurrence of thyroid cancer in Samsung Seoul Medical Center were analyzed. Results: We analyzed cause of death in 55 fatal cases. Single fatal conditions could not be specified in 13 patients. In the remaining 42 patients, respiratory failure (57.1%) was the most common specific fatal condition, followed by airway obstruction (26.2%), renal failure (7.1%) and sepsis (7.1%). According to histologic subtype, overall survival and relapse survival were statistically significant (P<0.005). However, No significant difference in disease free survival was observed (P=0.09).Conclusion: Early diagnosis and suitable treatment were also important factors for thyroid cancer. There was shorter relapse survival length in papillary cancers than that of follicular cancers. Anaplastic cancers had a poorer survival. We couldn't find difference of relapse survival result from the treatments of metastatic thyroid cancer. (Korean J Endocrine Surg 2004;4:21-25)
컴퓨터 그래픽에서의 효율적인 2차원 직선클리핑 알고리즘
禹相旭,趙源敬 慶熙大學校 1990 論文集 Vol.19 No.-
This paper proposes a development algorithm for clipping a line in two dimensions against a rectangular window. This algorithm avoids computation of intersection points which are not end point of the output line segment. In order to compare performance with previous algorithm, this paper is compared with number of arithmetic operations needed for clipping in all conditions which can be occurred. As a result of comparing it was proved that proposed algorithm is more efficient than CS and TR chipping algorithm in same conditions.