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레이더 신호 탐지를 위한 잡음제거 임계레벨 자동제어 기법
이치헌,Lee, Chi-Hun 한국군사과학기술학회 2013 한국군사과학기술학회지 Vol.16 No.2
In this paper, we proposed an automatic threshold control method for radar warning receiver. Considering the noise level of the environment, this technique can effectively adjust sensitivity level of radar warning receiver and can offer more accurate radar information for aircraft pilot in noisy circumstances.
주요우울장애 환자에서 생애초기스트레스와 연관된 심박변이도의 특성
이치헌,김민경,최선우,박해인,석정호 대한우울조울병학회 2017 우울조울병 Vol.15 No.3
variability (HRV) is a reliable psychophysiological marker for functions of the autonomic nervous system. The purpose of this study was to investigate characteristics of HRV associated with ELS in patients with major depressive disorder (MDD). Methods : We compared HRV measures of MDD patients with ELS and without ELS in a 5-minute resting-state electrocardiogram recoding. Forty subjects participated in the study (25 with ELS, 15 without ELS). The Mann-Whitney test was conducted to identify group differences. Results : We found significant group differences in standard deviation of the NN interval (SDNN) and total power (TP). SDNN was lower in the ELS group (M=38.80 ms, SD=13.05 ms) than in the Non-ELS group (M=53.53 ms, SD=19.47 ms). TP was lower in the ELS group (M=7.07 ms2, SD=0.69 ms2) than in the Non-ELS group (M=7.72 ms2, SD=0.77 ms2). Conclusion : ELS may have a negative impact on the autonomic nervous system function in patients with MDD. ELS and dysfunction of autonomic nervous system should be considered in treatment for patients with MDD.