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이상목,최석화,이현하,이원창,Lee Sang-mog,Choi Seok-hwa,Lee Hyun-ha,Lee Won-chang 대한수의사회 1992 대한수의사회지 Vol.28 No.6
This study was performed to investigate the infestation rate of heartworm(Dirofilaria immitis) in the peripheral blood of the dog being raised in Korea. Blood samples were obtained between 17 : 00 and 20 : 00 from June to August, 1991. Heartworm was exami
고식적인 라섹과 웨이브프론트 방식을 이용한 라섹 전후의 고위수차의 변화 비교
이상목,이민정,김미금,위원량,이진학,Sang Mok Lee,Min Joung Lee,Mee Kum Kim,Won Ryang Wee,Jin Hak Lee 대한안과학회 2007 대한안과학회지 Vol.48 No.8
Purpose: To evaluate the postoperative higher-order aberrations (HOAs) and factors affecting postoperative changes in HOAs in eyes that underwent wavefront-guided LASEK (laser-assisted subepithelial keratectomy), compared with the eyes that underwent conventional LASEK. Methods: We reviewed the medical records of 221 patients who had undergone LASEK or wavefront guided LASEK with VISX WaveScan and VISX Star S4 eximer laser by a single surgeon (427 total eye operations). We matched 29 eyes of the LASEK and the wavefront LASEK groups (58 eyes total) according to the guideline: preoperative refractive power differences must be within 1 diopter and preoperative root-mean-square (RMS) of total HOAs differences must be within 0.01 ?m. Preoperative wavefront aberrations and two-months postoperative wavefront aberrations and associated factors were compared and analyzed. Results: Postoperative total HOAs, comas, and spherical aberrations increased significantly from 0.36±0.10 ?m to 0.49±0.16 ?m (p=.001), 0.21±0.09 ?m to 0.31±0.14 ?m (p=.003), and 0.03±0.10 ?m to 0.10±0.20 ?m (p=.043), respectively, in the conventional LASEK group. In the wavefront LASEK group, postoperative HOAs, comas, and spherical aberrations significantly increased from 0.36±0.10 μm to 0.46±0.14 μm (p=.004), 0.18±0.10 ?m to 0.29±0.14 ?m (p=.002), and 0.09±0.14 ?m to 0.19±0.14 ?m (p=.006), respectively. There were no significant differences in HOAs between the two groups. A strong negative correlation between preoperative total HOAs and a multiple of increase in total HOAs postoperatively was found, with the negative correlation being stronger in the wavefront-guided LASEK group (Pearson’s correlation coefficient =-0.697, p<.001) than in the LASEK group (Pearson’s correlation coefficient =-0.632, p<.001). Conclusions: There were no significant decreases in HOAs in the eyes that underwent wavefront-guided LASEK compared with the matched control eyes of patients that underwent conventional LASEK. Analyzing the tendency of a multiple of increase in total HOAs according to the preoperative HOAs, it suggests that the wavefront-guided LASEK may be more effective in suppressing an increase in total HOAs in the eyes with higher preoperative HOAs.
이상목,윤중한,김흥수,Lee, Sang-Mok,Yoon, Joong-Han,Kim, Heung-Soo 한국전기전자학회 2002 전기전자학회논문지 Vol.6 No.1
In this paper, a microstrip array antenna is designed, fabricated and measured for ETCS(Electronic Toll Collection System). To reduce effect of external propagation environment, we use edge-cuffed element and to obtain wider axial ratio and increased bandwidth, we use the sequential rotation array method. Also to fulfill ETCS, roadside equipment are designed to be provide a radiation pattern which can accurately pinpoint the designated communication area without interference of another lanes. And we make and apply an absorber to the array antenna to reduce SLL(Side Lobe Level). From the measurement, we get that return-loss at center frequency is -20.675dB, axial ratio is 0.35dB and the gain is 20.26dBi. And we found that SLL is reduced. 본 논문은 ETCS용 마이크로스트립 배열안테나를 설계, 제작 및 측정하였다. 외부전파환경의 영향을 줄이기 위하여 원형편파안테나를 사용하였으며, 더 넓은 축비대역폭과 반사손실대역폭을 얻기 위하여 시퀸셜 로테이션 배열방법을 사용하였다. 또한 ETCS용 안테나로 사용되기 위하여 노변장치용 안테나는 인접차선과 간섭없이 설정된 통신영역에서 정확히 통신할 수 있는 방사패턴을 제공하도록 설계되어야 한다. 본 논문에서 제작된 노변장치용 안테나의 sidelobe를 감소시키기 위하여 흡수체를 제작 부착하였다. 흡수체를 부착하여 측정한 결과, 중심주파수에서 -20.675dB의 반사손실을 얻었으며, 축비는 0.35dB, 안테나이득은 20.26dBi를 얻었다. 그리고 SLL은 -20dB 이하로 감소된다는 것을 확인하였다.