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이정한(Jeonghan Lee),박한훈(Hanhoon Park) 한국통신학회 2022 한국통신학회 학술대회논문집 Vol.2022 No.2
본 논문은 딥페이크(deepfake) 영상 검출을 위해 영상을 패치로 나누고 패치별로 위조 여부를 판별한 후, 각 패치에 대한 판별 결과를 취합하는 방법을 제시하고, StyleGAN2로 생성된 영상에 대한 검출 성능을 실험을 통해 검증한다. 실험 결과, 패치 크기에 따라 검출 정확도는 달라졌으나, 전반적으로 패치 기반 방법은 검출 정확도를 크게 개선할 수 있으며, 신뢰도가 높은 패치를 선별하는 과정을 추가함으로써 검출 정확도를 보다 향상시킬 수 있음을 확인하였다.
이정한(Jeonghan Lee),조경석(Kyungseok Cho),선효성(Hyosung Sun),신형기(Hyungki Shin),이수갑(Soogab Lee) 한국유체기계학회 1998 유체기계 연구개발 발표회 논문집 Vol.- No.-
Aerodynamic noise generated by automobile cooling fan is investigated. Automobile cooling fans radiate both discrete frequency noise as well as broadband noise. In the present work, the former is considered through free-wake panel method coupled with acoustic analogy fully considering the retarded time variation on the blade surface, while the latter is taken into account by three well-established broadband noise components. Experiments were performed to supplement necessary inputs as well as to provide the final comparison with the predicted noise spectrum. The predicted noise levels at blade passing frequencies agree well with the experimental data for the first few harmonics. Although the predicted broadband noise levels at higher frequencies fall below the experimental data due to the fundamental shortcomings of the utilized formulations, the analysis offers a detailed physical understanding of the fan noise generation processes.
기승희,Lee Dongeon,Lee Wonjin,Cho Kwangrae,Han Yongjae,Lee Jeonghan 대한마취통증의학회 2022 Anesthesia and pain medicine Vol.17 No.1
Background: Differences in the effects of propofol and dexmedetomidine sedation on electroencephalogram patterns have been reported previously. However, the reliability of the Bispectral Index (BIS) value for assessing the sedation caused by dexmedetomidine remains debatable. The purpose of this study is to evaluate the correlation between the BIS value and the Modified Observer’s Assessment of Alertness/Sedation (MOAA/S) scale in patients sedated with dexmedetomidine. Methods: Forty-two patients (age range, 20–80 years) who were scheduled for elective surgery under spinal anesthesia were enrolled in this study. Spinal anesthesia was performed using 0.5% bupivacaine, which was followed by dexmedetomidine infusion (loading dose, 0.5–1 μg/kg for 10 min; maintenance dose, 0.3–0.6 μg/kg/h). The MOAA/S score was used to evaluate the level of sedation, and the Vital Recorder program was used to collect data (vital signs and BIS values). Results: A total of 215082 MOAA/S scores and BIS data pairs were analyzed. The baseline variability of the BIS value was 7.024%, and the decrease in the BIS value was associated with a decrease in the MOAA/S score. The correlation coefficient and prediction probability between the two measurements were 0.566 (P < 0.0001) and 0.636, respectively. The mean ± standard deviation values of the BIS were 87.22 ± 7.06, 75.85 ± 9.81, and 68.29 ± 12.65 when the MOAA/S scores were 5, 3, and 1, respectively. Furthermore, the cut-off BIS values in the receiver operating characteristic analysis at MOAA/S scores of 5, 3, and 1 were 82, 79, and 73, respectively. Conclusion: The BIS values were significantly correlated with the MOAA/S scores. Thus, the BIS along with the clinical sedation scale might prove useful in assessing the hypnotic depth of a patient during sedation with dexmedetomidine.