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위성 SAR용 광대역 이중편파 적층형 패치 배열 안테나 설계 및 제작
이재민,유제우,채희덕,이유리,정화영,김종필,박종국,Lee, Jae-Min,Yu, Je-Woo,Chae, Heeduck,Lee, YuRi,Jung, Hwa-Young,Kim, JongPil,Park, Jongkuk 한국ITS학회 2021 한국ITS학회논문지 Vol.20 No.2
본 논문에서는 위성 SAR 시스템에 적용하기 위한 광대역 이중편파 적층형 패치 안테나를 설계하고 제작 결과를 제시하였다. 위성 SAR 분야에 주로 적용되는 X-대역에서 위성 SAR 시스템의 영상 품질 향상을 위해 손실 최소화, 광대역 동작 그리고 능동위상배열안테나에 적용이 가능하도록 능동반사손실 최소화 관점에서 안테나를 설계하였다. 제작된 안테나의 대역폭은 능동반사손실 -10 dB 이하 기준에서, 수직/수평 편파 각각 19.26%/19.79% 이며, 손실은 주파수 평균으로 수직/수평 편파 각각 0.797 dB/0.799 dB 로 확인되었다. 또한, 근접전계시험으로 안테나의 빔 패턴을 확인하다. 그 결과, 배열이론을 바탕으로 계산된 이상적 패턴과 비교하여, 측정된 패턴 및 지향성이 매우 유사함을 확인하였다. This paper proposes a wide-band dual-polarization stacked patch array antenna for satellite SAR system applications. The array antenna was designed for loss minimization and wide-band characteristics to enhance the performance of the SAR system and optimize it for active return loss in applications to active phased arrays. The fabricated array antenna showed a performance of 19.26%/19.79% fractional bandwidth within the -10 dB reference level of the active return loss and showed loss characteristics of 0.797 dB/0.799 dB averaged within the operational frequency for both H/V-polarization cases. The pattern performance was verified by comparing the measured patterns with the calculated patterns obtained by the array factor.
고해상도 흉부 전산화단층촬영을 이용한 간질성 폐질환을 가진 환자의 자세에 따른 해부학적 구조물 크기 비교
이재민(Jae-min Lee),박제헌(Je-heon Park),김주성(Ju-seong Kim),임청환(Cheong-Hwan Lim),이기백(Ki-Baek Lee) 대한방사선과학회(구 대한방사선기술학회) 2021 방사선기술과학 Vol.44 No.2
High-Resolution thoracic CT (HRCT) is a scanning protocol in which thin slice thickness and sharpness algorithm are utilized to enhance image resolution for diagnosis and assessment of interstitial lung disease (ILD). This examination is sometimes performed in both supine and prone position to improve sensitivity to early changes of these conditions. Anatomical structures (the size of lung field and heart and descending aorta) of 150 patients who underwent HRCT were retrospectively compared. HRCT had been conducted in two positions (supine and prone). Data were divided into five groups according to patient body weights (from 40 to more than 80kg, 10kg intervals, 60 patients/each group). Quantitative analysis was utilized in Image J program. In the supine position defined as the control group, the average values of lung fields and heart size and aorta were compared with the prone position defined as the experimental group. The size of the lungs was found to be higher in the supine position, and it was confirmed that there was a statistically significant difference in patients over 70 kg (p<0.05). In addition, both sizes of the heart and descending aorta were larger in prone position, but in the case of the heart, there was no correlation with the presence or absence of ILD disease (p>0.05). Also, the area of prone in the descending aorta was higher than supine position, but there was no statistically significant difference between supine and prone position (p>0.05). In conclusion, when the severity of ILD disease was severe, there was no statistically significant difference in the area difference between supine and prone position, so it is considered that it will be helpful in diagnostic decision.
권민정(Min Jung Kwon),문은수(Eunsoo Moon),박제민(Je Min Park),이병대(Byung Dae Lee),이영민(Young Min Lee),이재민(Jae Min Lee),김정범(Jung Bum Kim) 대한생물치료정신의학회 2012 생물치료정신의학 Vol.18 No.2
Objectives:This study aimed to compare anger coping strategies between bipolar I disorder and schizophrenia, and to explore the relationship between impulsivity and anger coping strategies. Methods:Forty three bipolar patients who met DSM-IV criteria for bipolar I disorder and forty three schizophrenia controls who were matched by age and sex were included. Anger coping strategies were measured by Anger Coping Scale(ACS), and the levels of impulsivity were also measured by Barratt Impulsiveness Scale(BIS). Independent t-test was used to compare anger coping strategies between two groups, and analysis of covariance(ANCOVA) to adjust the influence of impulsivity. Results:Score of problem-solving coping strategy was significantly higher in bipolar I disorder than schizophrenia (t=-2.047 p=.044). Problem-solving strategy was negatively correlated with total impulsivity in both bipolar patients and schizophrenic controls(bipolar I disorder r=-.376 p=.013 ; schizophrenia r=-.395 p=.009). There was no significant difference of problem-solving coping strategy between two groups after adjusting impulsivity(F=2.385 p=.126). Conclusion:These results suggested that bipolar I patients have a tendency to use more problem-solving coping strategy for anger situation than schizophrenia, which can be influenced by the level of impulsivity.