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여수철(Su-Cheol Yeo),주우용(Woo-Yong Joo),정봉식(Bong-Sik Jeong) 한국통신학회 2009 한국통신학회 학술대회논문집 Vol.2009 No.6
본 논문에서는 중심주파수가 311MHz/ 44MHz인 이중대역과 차세대 RKE 시스템용으로 사용되는 900MHz/ 2.4GHz의 이중대역을 갖는 소형 패치 안테나를 PCB 상에 설계하였다. 안테나는 프루브 급전하였으며, 급전부에는 중심주파수 조정과 임피던스 정합이 용이하도록 PIFA(Planar Inverted-F Antenna) 구조를 적용하였다. 안테나는 PCB상에 인쇄되며, 30mm×20mm 이내의 크기로 설계하였다. RKE 리더기 케이스의 영향을 고려하여 설계하였으며, 스파이럴 선로 상에 인덕터를 삽입하여 이중 공진을 얻도록 하였다.
여수철(Su-Cheol Yeo),주우용(Woo-Yong Joo),정봉식(Bong-Sik Jeong) 한국정보기술학회 2009 Proceedings of KIIT Conference Vol.2009 No.-
본 논문에서는 900㎒/ 2.4㎓ 대역에서 이중대역 특성을 갖는 소형 패치 안테나를 FR4_epoxy 기판 상에 설계하였다. 안테나는 프루브 급전하였으며, 급전부에는 주파수 조정과 임피던스 정합이 용이하도록 PIFA(Planar Inverted-F Antenna) 개념을 적용하였고, 설계된 안테나는 30㎜×20㎜ 이내의 크기로 설계하였다. 스파이럴 구조와 미앤더 구조를 혼합한 스파이럴 선로 두 개를 사용하여 이중 공진 특성을 구현하였다. In this paper, dual band small patch antenna on FR4_epoxy plate, with the center frequencies of 900㎒ and 2.4㎓, was designed. PIFA concept was applied to tune impedance matching and frequencies easily. The size of antenna designed on FR4_epoxy plate is within 30㎜×20㎜. Two spiral and meander lines are used to generate dual bands.
여수철(Su-Cheol Yeo),주우용(Woo-Yong Joo),정봉식(Bong-Sik Jeong) 제어로봇시스템학회 2009 제어로봇시스템학회 합동학술대회 논문집 Vol.2009 No.12
본 논문은 RKE에 사용되는 311MHz/447MHz 이중대역 안테나와 447MHz/900MHz 이중대역 안테나의 설계에 대해서 다루고 있다. 안테나의 급전부는 공진주파수의 조정과 임피던스의 정합이 쉬운 PIFA(Planar Inverted-F Antenna) 개념을 적용하고, 이중공진 특성은 스파이럴 선로의 중간에 인덕터를 삽입하거나, 스파이럴 선로를 분리시켜 구현하였다. 안테나는 30mm×20mm 이내의 크기를 갖도록 설계하였다.
흡수기 용액 재순환이 흡수식 냉동기 성능에 미치는 영향
정종수,진성민,박찬우,최승학,정봉철,Jeong, Jong-Su,Jin, Seong-Min,Park, Chan-U,Choe, Seung-Hak,Jeong, Bong-Cheol 대한기계학회 2002 大韓機械學會論文集B Vol.26 No.5
If a part of the poor solution from the absorber outlet is recirculated to the absorber inlet, the solution temperature at the solution spray pump can be reduced, and the solution flow rate in the absorber is increased. We have performed the experiments on the influences of the absorption chiller performance according to the ratio of the recirculation, defined as the ratio of the recirculation flow rate to the total solution flow rate at the absorber outlet. As increasing the ratio of the recirculation, the absorption capacity of the solution can be deteriorated. On the other hand, due to the increasing flow rate, the heat transfer rate can be enhanced. As a result, the performance of the absorber and the cooling capacity of the absorption chiller have nothing to do with the recirculation ratio, and the lifetime of the spray pump will be maintained.
배상욱 ( Bae Sang Ug ),정병화 ( Jeong Byeong Hwa ),윤보성 ( Yun Bo Seong ),김의혁 ( Kim Ui Hyeog ),정봉철 ( Jeong Bong Cheol ),박주현 ( Park Ju Hyeon ),신종승 ( Sin Jong Seung ),김세광 ( Kim Se Gwang ),박기현 ( Park Gi Hyeon ) 대한산부인과학회 2004 Obstetrics & Gynecology Science Vol.47 No.5
Objective : To identify 1) whether the endogenous steroid hormone metabolism in patients with pelvic organ prolapse was different from that of normal women, 2) the relationship between endogenous steroid hormone metabolites and the stage of the pelvic organ prolapse. Methods : Twenty postmenopausal women who were clinically diagnosed as having pelvic organ prolapse and 20 volunteer postmenopausal women not having pelvic organ prolapse were included in the study. We compared the urinary profiles of endogenous steroids between the two groups and investigated the relationship between urinary profiles of the endogenous steroids and the degree of pelvic organ prolapse. Urinary profiles of the endogenous steroids were assayed by gas chromatography-mass spectrometry. Results : The ages of the patients and control group were 64.6±6.5 and 63.5±3.9 years, and the Body Mass Index (BMI) was 23.96±3.14 and 24.11± kg/m^2 in patients and in normal subjects, respectively. The number of patients in each stage were 4 in stage Ⅰ, 4 in stage Ⅱ, 6 in stage Ⅲ and 6 in stage Ⅳ. 5-androstene-3β, 16β, 17β-triol (5-AT), 11β-hydroxy androstenedione (An) and 17β-estradiol were significantly increased in patients with pelvic organ prolapse over that of the control group (0.76±0.67 vs 0.06±0.03 μmole/g creatinine; p=0.002, 1.16±0.83 vs 0.65±0.23 μmole/g creatinine; p=0.04, 15.08±9.81 vs 8.53±6.19 μmole/g creatinine; p=0.04). However, tetrahydrocortisone (THE) was significantly increased in the control group over that in patients having pelvic organ prolapse (9.80±6.21 vs 5.22±4.89 μmole/g creatinine; p=0.04). The androgen metabolites, 5-AT and THE significantly correlated with the POP-Q stage (R=0.418; p=0.027, R=0.46; p=0.016). Among the estrogen metabolites, 17β-estradiol was correlated to the POP-Q stage but not mathematically significantly (R=0.38; p=0.05) and the 17β-estradiol/extrone ratio weakly correlated to pelvic organ prolapse stage (R=0.14l p=0.49,), by showing a low correlation coefficiency. Conclusion : The urinary concentrations of 17β-estradiol, 5-AT and 11β-hydroxy an increased in patients with pelvic organ prolapse over that of the control group and 5-AT, THE and 17β-estradiol showed a relationship to the progression of pelvic organ prolapse in Korean women. The metabolites of endogenous steroid hormones could be contributing factors in the pathogenesis of pelvic organ prolapse.