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김병천,김정일 안성산업대학교 1996 論文集 Vol.28 No.-
We propose a fast fractal image coding algorithm to shorten long time to take on fractal image encoding. For its performance evaluation, the algorithm compares with other traditional fractal coding methods. In the traditional fractal image coding methods, an original image is contracted by a factor in order to make the corresponding image to be compared with. Then, the whole area of the contracted image is searched in order to find the fixed point of contractive transformation of the original image corresponding to the contracted image. It needs a lot of searching time on encoding. However, the proposed algorithm considerably reduces encoding time by using scaling method and limited search area method. On comparison of the proposed algorithm with Jacquin's method, the proposed algorithm is at least 180times as fast as that Jacquin's method on encoding time with a little degradation of the decoded image quality and a little increase of the compression rate. Therefore, it is found that the proposed algorithm largely improves the performance in the aspect of encoding time when compared with other fractal image coding methods.
장기간의 갑상선 호르몬 술 후 대체요법 시 골밀도의 변화
김병천,노혜원,정연승,윤인상,정순주,박민호,윤정한,제갈영종,Byung Chun Kim,Hye Won Ro,Yeun Sung Jung,In Sang Yoon,Soon Ju Jeong,Min Ho Park,Jung Han Yoon and Young Jong Jegal 대한갑상선-내분비외과학회 2006 The Koreran journal of Endocrine Surgery Vol.6 No.1
Purpose: Bone turnover is increased in patients suffering with hyperthyroidism, and this results in osteoporosis. Especially after total thyroidectomy for the treatment of thyroid papillary cancer, it is necessary to pay attention to osteoporosis because we must treat these patients with suppressive thyroxine therapy. Methods: Among the patients who underwent endocrine surgery of Chonnam National University, 110 cases had taken thyroxine for more than one year. We analyzed them on the basis of their medical record. The study consisted of women between 45 and 74 years of age who were treated with thyroxine for more than one year, who had total thyroidectomy performed for thyroid papillary carcinoma and who taken thyroxine for 12∼142 months (mean: 53 months). We measured the bone mineral density at the lumbar spine and the femoral neck with using dual energy X-ray absorptiometry. Results: The bone mineral density of the lumbar spine and femur neck was significantly reduced with the increasing the duration of thyroxine medication. Yet this was not significant after adjusting by age. There was correlation between the TSH levels and bone mineral densities. Conclusion: After total thyroidectomy, it may be necessary to evaluate the bone mineral density of the patients who were treated with suppressive thyroxine and also to warn them about osteoporosis. (Korean J Endocrine Surg 2006; 6:1-5)
김병천,박경배 안성산업대학교 1997 論文集 Vol.29 No.1
Most fractal image codings schemes require too much encoding time because a large amount of computation is needed to find an optimal affine transformation point. In general, it is possible to predict more precise and various types of blocs in frequency domain rather than in spatial domain. In this paper, we propose a block classifier to predict the block type using characteristics of DCT(Discrete Cosine Transform) coefficient. AC coefficient values in frequency domain make possible to predict various types of blocks. As the results, the number of comparisons between a range block an the correspoding domain blocks to reach an optimal affine transformation point ca be reduced. Specially, signs of DCT coefficients help to find the optimal affine transformation point with only two onto by eliminating unnecessary isometric transformations among eight isometric transformations used in traditional fractal codings.
나종형나 및 나성결절홍반 환자에서의 뇨중 Neopterin치의 변동
김병천,이규석,송준영,곽춘식 ( Byung Chun Kim,Kyu Suk Lee,Joon Young Song,Chun Sik Kwak ) 대한피부과학회 1988 大韓皮膚科學會誌 Vol.26 No.3
In lepromatous leprosy, it is generally believed that there is not only defective CMl specific for M. leprae, but also generalized impairment of CMI and in erythema nodosum leprosum, an immune complex-mediated pathogenesis as well cell mediated immune pathogenesis have been proposed. Neopterin is a pyrazinopyrirnidine compound derived from GTP, its raised excretion has been related to activation of T-lymphocyte/macrophage axis. A study was performed to evaluate generalized CMI status in the LL and ENL and to investigate a relationship between levels of urinary neopterin and disease activity. Urinary neopterin was measured by high pressure liquid chromatography in 25 healthy subjects, in 25 patients with LL and in 25 patients with ENL. The results were as follaws 1. Urinary Neopterin levels of patients with LL was 188.9+147.3umol/mol creatinine, which was higher than that of control group(144.8+40.4umol/mol creatinine)(p<0.01). 2. Urinary Neopterin levels of patients with ENL was 884.1+970.5umol/mol creatinine, which was higher than of control group, and patients with LL(p<0.01, p<0.01). 3. Serial measurement of urinary neopterin from 1 week to 13 weeks after treatment of ENL in 4 cases of ENL showed good correlation between urinary neopterin levels and disease activity. In summary, it thus appears that measurement of urine neopterin in leprosy provides generalized CMI status and reliable index for activity of disease.