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PN 부호 알고리즘의 개선을 통한 사용자간 다원접속간섭 제거에 관한 연구
김나영(Kim, Na-Young),김지희(Kim, Jee-Hee),최성민(Choi, Seong-Min),손동철(Son, Dong-Cheul),김희선(Kim, Hee-Sun) 한국산학기술학회 2010 한국산학기술학회논문지 Vol.11 No.8
DS-CDMA 방식은 하나의 무선 채널을 다수의 이동국들이 시간과 주파수를 공유하여 사용하게 되는데, 이때 이동국 간의 간섭 최소화를 목적으로 PN 부호(Pseudo-noise Code)를 사용한다. 하지만 PN 부호는 상관 특성으로 시 간지연이 0일 때 상관 값이 1이 되지만, 시간지연이 0이 아닐 때는 상관 값이 1/N이 되어 완전한 상관 특성을 이루 지 못하게 된다. 이로 인해 사용자가 증가될 경우 사용자 간의 간섭에 의해 성능 저하 및 시스템 용량 제한 문제가 여전히 발생할 수 있다. 따라서 본 논문에서는 PN 부호가 이상적인 자기 상관관계를 가지게 하고, 오프셋(offset)을 가진 PN 부호를 사용함으로써 사용자들 간의 다원접속간섭(Multiple Access Interferemce)을 제거함을 증명하였다. In DS-CDMA method, Mobile Stations own jointly one radio channel and are made to use a PN code (Pseudo-Noise Code) for the purpose of minimize interference. However, corelation value of PN code is one when time delay is zero but the corelation value is 1 / N when time delay is not 0. Therefore corelation characteristic does not fully attained. As a result, when the user increase, the performance degradation and system capacity problem will be able to occur by interference among users. In this paper, the PN code has ideally self corelation. It was proved that PN code could depress interference from other users in multiple access system.
정윤석(Yoon Sok Chung),김현만(Hyeon Man Kim),이은직(Eun Jig Lee),정재희(Jae Hee Chung),이경미(Kyung Mi Lee),박석원(Seog Won Park),조홍근(Hong Keun Cho),이현철(Hyun Chul Lee),허갑범(Kap Bum Huh),박유경(Yoo Kyoung Park),김희선(Hee Son 대한내과학회 1994 대한내과학회지 Vol.47 No.3
N/A Objectives: Growth hormone secretory capacity of adults decrease with aging, Growth hormone secretory capacity and prevalence of growth hormone deficiency in Korean adults were studied. Methods: History, physical examination, and routine blood tests were performed to roule out ill patients among ordinary subjects. Anthropometry, nutritional history, serum insulin-like growth factor-1 (IGF-1) levels, L-dopa stimulation tests, and urinary growth hormone levels were measured in 309 Korean adults, ages 20-87 years. Results: The mean serum IGF-1 levels were 258,2+6. 8 ng/ml. The mean serum IGF-1 levels of adult males were significantly higher than those of the females. The serum IGF-1 levels decreased with aging. The prevalence of growth hormone deficiency defined by serum IGF-1 levels (< 150 ng/ml) were 0.0% in the 3rd decade, 5.5% in the 4th decade, 12.2% in the 5th decade, 10.0% in the 6th decade, 32.1% in the 7th decade, 48.1% in the 8th decade, respectively. The serum IGF-1 levels were positively correlated with total energy expenditure, but negatively correlated with body fat mass. The peak serum growth hormone levels after L-dopa stimulation and urinary growth hormone levels of the younger subjects were significantly higher than those of the older subjects, There were goad correlations among serum IGF-1 levels, peak growth hormone levels after L-dopa stimulation, and urinary growth hormone levels. Conclusion: Growth hormone secretory capacity decreased significantly with aging, and growth hormone deficiency was found in about 1/3 of subjects aged over 60 years.
김희선,이종호,홍기영,이현철,임승길,이은직,김경래,정윤석,원영준,박유경,허갑범 대한내분비학회 1993 Endocrinology and metabolism Vol.8 No.3
Inriflavone, synthetic isoflavone, reduces bone resorption by inhibiting osteoclastic activiy. Compared to estrogen replacement therapy, ipriflavone had no risk of breast or endometrial cancer. We studed 24 cases of postmenopausal women. Nineteen patients on postmenopausal women were treated with 600 mg/day of ipriflavone (Teobone) by oral administration in 3 daily doses (treatment group), and five patients with placebo (control group). We studed nutritoinal status, biochemical bone marker, night time 12-hour urine pyridinoline/creatinine(PYD/Cr), and serum osteocalcin level. Our results were as followed. 1. Mean age of treated group and control group were 62±6 years, and 58±2 years old, respectively. Total calcium and animal calcium intake were 654±270 vs 599±254 mg/day and 276±199 vs 244±289mg/day, respectively. 2. Degree of bone pains was divided into no pain (0 pint), mild (1 point), moderate(2 points), and severe group (3 points). Treatment group improved pain score from 2.05±0.62 to 1.26±0.45 but control group had no interval change. 3. Serum level of calcium and inorganic phosphorus had no interval change before and after treatment, but serum level of alkaline phosphatase was significantly increased from 55±17 IU/L to 61±19 IU/L in control group. However ther was no change in treatment group. 4. Night time collected 12-hour urine PYD/Cr ratio was significantly decreased from 53±33 nM/mM to 42±32 nM/mM in reatment group, but there was no significant change in control group. Serum osteocalcin level was not significantly changed in treatment group. In conclusion, ipriflavone had effect on reliving bon pain and inhibiting bone resorption in patients with postmenopaual osteoporosis (J Kor Sco Endocrinol 8: 259~264, 1993)
김희선,신현용,한인기,이종욱 한국수학교육학회 1999 수학교육 Vol.38 No.2
Russia is a country which is interested in mathematics education for gifted students for a long time. Some aspect of education for the gifted students in Russia(for example, mathematics curriculum, contents and activities of study, and selection of students in Russian physio-mathematics school) has already been studied. The purpose of this work was to introduce system of the mathematics education by correspondence for gifted students in Russia. In order to achieve this goal, we analyzed Russian literatures and articles published by the various physio-mathematics correspondence schools for gifted students. In this article, we gave some characteristics of the physio-mathematics correspondence schools for gifted students: various types of mathematics education by correspondence, curriculum, practical materials for mathematics education by correspondence.