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역병렬 다이오드를 이용한 초광대역 시스템용 3~5 GHz 혼합기 설계
정구영,이동환,윤태열,Jung Goo-Young,Lee Dong-Hwan,Yun Tae-Yeoul 한국전자파학회 2005 한국전자파학회논문지 Vol.16 No.7
본 논문에서는 IEEE 802.15.3a의 초광대역(Ultra Wideband: UWB) 시스템용 직접 변환 혼합기를 설계 및 제작하였다. 직접 변환 방식을 사용하는 UWB 혼합기는 dc offset, 2차 고조파 왜곡 등을 발생시키는데, 이 문제를 해결하기 위해 역병렬 다이오드 쌍을 이용하였다. 본 논문에서는 $3.1\~4.8$ GHz 동위상 전력분배기와 $1.5\~2.4$ GHz 광대역 $45^{\circ}$ 위상 분배기 설계를 위하여 결합선로를 이용한 새로운 월킨슨 분배기를 제안하였다. 역병렬 다이오드 구조와 광대역 소자를 이용한 혼합기의 제작 결과는 주파수 변환 손실이 약 18 dB, input third order intercept point($IIP_3$)는 약 15 dBm, 그리고 1-dB gain compression point($P_{1dB}$)는 2 dBm으로 측정되었다. I/Q 출력 양단 간의 전력오차는 0.5 dB, 그리고 위상오차는 ${\times}3^{\circ}$를 지닌 초광대역 쿼드러쳐 혼합기로 동작하였다. This paper presents an ultra wide band(UWB) mixer using anti-parallel diode pair(APDP) with simulation and measurement results. The proposed mixer adopts the even-harmonic direct conversion mixing, which consists of a couple of filter, in-phase wilkinson power divider, wideband $45^{\circ}$ power divider, and APDP. The m mixer is operating over 3.1 to 4.8 GHz and producing quadrature(I/Q) outputs with a conversion loss of 18 dB and input third order intercept point($IIP_3$) of 15 dBm. I/Q outputs also have difference of about 0.5 dB and phase difference of ${\times}3^{\circ}$ and $P_{1dB}$ of 2 dBm.
2차 고조파를 이용한 UWB 시스템용 쿼드러쳐 혼합기 설계
정구영,임종혁,최병현,윤태열,Jung, Goo-Young,Lim, Jong-Hyuk,Choi, Byung-Hyun,Yun, Tae-Yeoul 한국전자파학회 2006 한국전자파학회논문지 Vol.17 No.12
본 논문에서는 IEEE 802.15.3a의 초광대역(Ultra Wideband: UWB) 시스템용 직접 변환 혼합기를 설계 및 제작하였다. 직접 변환 방식을 사용하는 UWB 혼합기는 dc offset, 2차 고조파 왜곡 등을 발생시키는데, 이 문제를 해결하기 위해 역병렬 다이오드 쌍을 이용하였다. $3.1{\sim}4.8GHz$ 동위상 전력분배기와 $1.5{\sim}2.4GHz$ 광대역 $45^{\circ}$ 전력분배기를 사용하였고, RF-LO의 격리도를 높이기 위하여 RF 신호는 -0.5 dB 이상 손실로 통과시키고 LO 신호는 -10 dB 이하로 차단하는 광대역 여파기를 작은 크기로 설계하였다. 이와 더불어, 역병렬 다이오드와 광대역 소자의 초광대역 임피던스 정합을 통해 주파수 변환 손실을 최소로 하였다. 제안된 혼합기의 측정 결과는 주파수 변환 손실이 13.5 dB, input third-order intercept-point($IIP_3$)는 7 dBm, 그리고 1-dB gain compression point ($P_{1dB}$)는 -4 dBm이다. I/Q 출력 양단간의 전력 오차는 1 dB, 그리고 위상오차는 ${\pm}3^{\circ}$이내의 초광대역 쿼드러쳐 혼합기로 동작하였다. This paper presents an ultra wideband(UWB) direct conversion mixer for IEEE 802.15.3a applications with simulation and measurement results. Since the direct conversion mixing causes dc-offset and even-order distortion, the proposed mixer adopts an anti-parallel diode pairs(APDPs) to solve these problems. The proposed mixer consists of an in-phase wilkinson power divider over $3.1{\sim}4.8GHz$, a wideband $45^{\circ}$ power divider over $1.5{\sim}2.4GHz$, and miniatured band pass filters(BPFs) for RF-LO isolations. The conversion loss is optimized with impedance matchings between APDPs and wideband components. The measured mixer shows the conversion loss of 13.5 dB, input third-order intercept-point($IIP_3$) of 7 dBm, and 1-dB gam compression point($P_{1dB}$) of -4 dBm. Quadrature(I/Q) outputs have the magnitude difference of about 1 dB and phase difference of ${\pm}3^{\circ}$.
초등학교 고학년 남학생의 자아탄력성이 학교생활적응에 미치는 영향
최영철(Choi, Young-Chyul),정구영(Jung, Goo-Young),이준우(Lee, Jun-Woo) 한국체육과학회 2015 한국체육과학회지 Vol.24 No.6
This study was to examine on the basis of the impact of self-elasticity on school life adaptation of the senior elementary school male students whether the participation in physical activity in the form of after-school Taekwondo was acting as an adjustment variable in the relationship between them. To do this, the data were collected from 327 elementary school male students in the 5-6th grade and they were divided into groups by whether they participated in Taekwondo activity or not. In addition, the statistical analysis SPSS 18.0 and AMOS 18.0 program were used in order to solve the study problem presented in this study. As for the confirmation of the normality of the general characteristics and data of the subjects, descriptive statistics and correlation analysis were conducted and the verification of reliability were identified by exploratory factor analysis and Cronbach"s α . Finally, for α the impact of the self-elasticity of senior elementary school male students on school life adaptation and for the verification of the adjustment effectiveness of after-school Taekwondo training participation, a structural equation model was applied. Conclusions obtained from these procedures are as follows. First, the higher the self-elasticity of elementary school male students was, the higher the school life adaptation was. Second, the after-school Taekwondo activity was acting as an adjustment variable in terms of the impact of self-elasticity on school life adaptation as it showed higher influence on the subjects than on the male students who did not participate. Since enhancing the school life adaptation of the elementary school students was a policy that could raise the feeling of happy school life, a general conclusion was reached that enhancing self-elasticity and participating directly in physical activities such as Taekwondo could be helpful.
최재일(Choi Jae-Il),정구영(Jung Goo-Young) 한국체육과학회 2008 한국체육과학회지 Vol.17 No.4
The purpose of this study was to investigate the research injuries in KLPGA golf athletes. KLPGA golfers were randomly assigned to two group; (a) excellence players (b) general players Result of this study were as follows, (1) Sports injuries types and diagnosis of professional Golfers. (2) Sports injuries types and diagnosis to Game First, there were in practice(55.8%), in field(31.0%), in game(2.5%) of resulting injury time. Second, there were driver shot(40.1%), wood shot(26.4%), long-iron shot(24.9%), middle-iron shot(6.1%), short-iron shot(2.5%) of resulting injury movements. Third, there were self-treatment(16.2%), a coach(42.6%), a doctor(22.8%), a colleague of resulting emergency needs Fourth, there were 1-5 days(34.7%), 6-10 days(13.7%), 11-15 days(13.7%), 16-20 days(7.4%), more 30 days(22.1%) medical treatment period.
중요타자의 참가지지가 시니어 남자 골프선수의 자아존중감, 참가노력 및 지속참가의사에 미치는 영향
곽규훈(Kwak, Kyu-Hoon),정구영(Jung, Goo-Young),성용석(Sung, Yong-Suk) 한국체육과학회 2019 한국체육과학회지 Vol.28 No.2
This study aims to define the effects of important others` participation support on senior male golf players` self-esteem, their efforts for participation, their continuous participation intention. To that end, this study analyzed the survey data of 1 02 participants in KPGA Champions Tour held in April 2018. The following conclusion thus was reached. First, family support had positive effects on the self-pride of self-esteem, on all sub-factors of efforts for participation, and on continuous participation intention. Further, friends and colleagues` support had positive effects only on a change to passion for efforts for participation and on partner search factors, thus suggesting that, in important others` participation support, the family support factor is the most important for senior male golf players. Second, in senior male golf players` self-esteem, the self-pride factor had positive effects on all sub-factors of continuous participation intention and efforts for participation, and the self-satisfaction factor of self-esteem had positive effects only on the partner search factor of efforts for participation, suggesting that the self-pride of self-esteem worked importantly for senior male golf players. Third, in senior male golf players` efforts for participation, partner search and monetary factors had positive effects on continuous participation intention, suggesting that the stronger the inclination of homogeneous group is and yet the more effective the economic help is, positive effects are created to bring on continuous participation in competitions. Hence, it is concluded that, for senior male golf players to continue to participate in competitions, family support and self-esteem improvement are important, and this makes it possible to reactivate the player`s life and to seek the individual`s happiness.
구홍두,최옥경,장석준,정구영,이정운,김승호 대한응급의학회 1993 대한응급의학회지 Vol.4 No.2
Inspite of immunization, TETANUS remains a disease with a high morbidity and mortality rate. Tetanus has been still occurred more frequently in developing countries where immunization programs are inadequate. In Korea, there is a routine immunuzation schedule with diphtheria, pertussis, and tetanus(DPT) vaccines at 2,4,6 month after birth at 18 month. But further prophylactic programs are not exist. Moreover, we have usually used only passive immunization, tetanus antitoxin, as a prophylactic regimen for injured patients instead of guidelines of Center for Disease Control. The purpose of this study was to assess the baseline tetanus immunity state and to suggest the proper immunization schedule and adequate prophylactic guideline for injured patients in Korea. One hundred thirty one trauma patients from emergency department of Severance hospital from September to November of 1993 were included. Antietanus antibody titers of the patients were analyzed by ELISA assay. The mean antitetanus antibody titer was 0.728 ±0.236IU/mL. The titers were diminished rapidly with age. In pediatric group(age under 15), the mean titer was 3.251 ±0.426 IU/mL and in geriatric group(age over 64), the mean titer was 0.007 ±0.002 IU/mL which was below the minimal protective antibody titer(0.01 IU/mL). While all of the pediatric patients have protective antibody titer, only 69.2% of young adults(15-39, n=65), 56.7% of adults(40-64, n=30), and 57.2% of geriatrics(>65, n=14) have protective antibody titer. Our results suggest that tetanus prophylaxis is unnecessary in the age under 14. In other age groups, however, our data strongly support the need of prophyulaxis.