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X-대역에서 중간동기결합 발진기의 설계 및 제작에 관한 연구
김희곤(Hee-gon Kim),서경환(Kyung-Hwan Seo) 한국컴퓨터정보학회 2007 한국컴퓨터정보학회지 Vol.15 No.1
본 논문에서는 X-band용 두 개의 발진기를 사용하여 중간결합을 통한 위상잡음 특성을 개선할 목적으로 중간동기결합 구조의 발진기를 제안하였다. 제안된 구조는 각각의 발진기는 Hair-Pin을 이용한 발진기로 설계를 하였으며, 두 발진기가 중간결합을 위해 갖는 위상차는 발진기들의 바이어스를 이용하여 조정을 한다. 제안된 구조의 수치계산을 통한 설계, 하드웨어 구현 및 실험을 통해 측정된 결과를 제시하였으며, 측정 결과로 위상잡음 특성이 약 10㏈c/㎐ 개선됨을 보였다.
김진용(Jin-Yong Kim),서경환(Kyong-Hwan Seo),예상욱(Sang-Wook Yeh),김현경(Hyun-Kyung Kim),임소영(So-Young Yim),이현수(Hyun-Soo Lee),권민호(MinHo Kown),함유근(Yoo-Geun Ham) 한국기상학회 2017 대기 Vol.27 No.3
Characteristics of precipitation in South Korea during the 2016 Changma period (6/18~7/30) are analyzed in great details. El Niño-induced tropical Indian Ocean (IO) basin-wide warming lasts from spring to early summer and induces the western North Pacific subtropical high (WNPSH) circulation anomaly through an equatorial Kelvin wave during the 2016 Changma period. Along the northern edge of the WNPSH, strong precipitation occurred, in particular, over eastern China and southern Japan. During the Changma period, South Korea had the near-normal mean precipitation amount (~332 mm). However, about 226 mm of rain fell in South Korea during 1 July to 6 July, which amounts to 67% of total Changma precipitation in that year. Upper-level synoptic migratory lows and low-level moisture transport played an essential role, especially from 1 July to 3 July, in triggering an abrupt development of fronts over the Korean Peninsula and the eastern continent China. The front over the eastern China migrates progressively eastward, which results in heavy rainfall over the Korean peninsula from 1 to 3 July. In contrast, from 4 to 6 July, the typhoon (NEPARTAK) affected an abrupt northward advance of the North Pacific subtropical high (NPSH). The northward extension of the NPSH strengthens the Changma front and induces the southerly flows toward the Korean peninsula, giving rise to an increase in heavy rainfall. The NEPARTAK is generated due to interaction of the Madden-Julian Oscillation (MJO), equatorial Rossby wave and Kelvin waves.
長壽에 關한 老人醫學的硏究 : 老人 人口의 傷病과 醫療를 中心으로
徐敬煥 서울大學校 保健大學院 1966 公衆保健雜誌 Vol.3 No.2
A study was carried out toward 1,497 persons (male 522, female 975), randomly selected, whose ages were over 60 years old, residing in Seoul city and Kyung Ki, choong chung Nam and choong chung puk provinces for the purpose of finding out their living status, hereditary tendency, relating to longevity, morbidity and medical care. the results were obtained as follows; 1) Living status a) It was observed that 57.6% of male and 53.2% of female are born in rural area and more people lived in rural area when they married. b) Average ages at marriage are shown as 19.2±4.5 for males and 16.3±3.4 for females. 66.6% of the males were older than their wife, while 34.1 percent of them were younger. Most of interviewees which occupy 87.9 percent of males and 95.7 percent of females had married once. c) The total number of live births per person averaged 4.54±2.85 and the number of living children averaged 3.25±2.14 d) majority or 75.3% of males and 97.4% of females did not have any occupation. 2) Hereditary tendency in longevity a) Average ages at death of grandparents and parents were 58.9±11.8 years for grand fathers, 60.0±10.4 years for grand mother, 59.2±14.5 years for father and 62.7±12.0 years for mother, in general, their grandparents and parents lived longer. b) Average age at death of the siblings who lived over 5 years of age was 59.0±13.5 years and it is longer than the expectation of life of the group of five years in general population of Korea. 3) Morbidity status a) Morbidity status by showed that, in male the average sickness days for a year was 60.1±18.6 days, Bed rest days averaged 19,.2±5.1 days and The days treated averaged 11.7±6.1 days. in female, the average sickness days for a year appeared to be 57.8±12.8 days, Bed rest days averaged 16.4±6.4 days and the days treated showed 11.8±4.6 days in average. the days treated is comparable with one fifth or one sixth of the total sickoness days. b) Disease-specific morbidity showed that diseases respiratory system were the most frequent one with 670 cases, the disease of the circulatory system and symptoms, senility and ill-defined conditions among the aged showed higher rate in morbidity than that of general population. 4) Medical care a) Total expenses for medical care by disease groups showed that the expenses for the diseases of the circulatory system amounted highest with 327,153 Won, while the expenes for the diseases of the blood and blood forming organs amounted least with 2,510 won. the expenses for medical care by Case showed that the expenses for Neoplosm were spent most with 2,100±796won per case and the cases of symptoms, senility and ill-defined canditions spent least with 145±46 won per case. b) The expenses for medical care by its kind showed that the most expenses were spent for modern medical care which was followed by the expenses for herbmedicine The expenses for care by health center were least. c) Medical expenses of the aged over 60 years had no significent differences according to their ages and educational level.