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류상욱,이남화,이연수,조인휘,민경육,김택수 한국반도체디스플레이기술학회 2020 반도체디스플레이기술학회지 Vol.19 No.2
In this paper, the new architecture of seizure prediction using CNN and LSTM and DWT was presented. In the proposed architecture, EEG data was labeled into a preictal and interictal section, and DWT was adopted to the preprocessing process to apply the characteristics of the time and frequency domain of the processed EEG signal. Also, CNN was applied to extract the spatial characteristics of each electrode used for EEG measurement, and LSTM neural network was applied to verify the logical order of the preictal section. The learning of the proposed architecture utilizes the CHB-MIT Scalp EEG dataset, and the sliding window technique is applied to balance the dataset between the number of interictal sections and the number of preictal sections. As a result of the simulation of the proposed architecture, a sensitivity of 81.22% and an FPR of 0.174 were obtained.
류상욱,김봉재,정광조,정원용,이수흠 한국조명전기설비학회 1994 조명.전기설비 Vol.8 No.3
본 연구에서는 공정제어에 널리 사용되는 PID제어기의 최적 자동 동조(Auto-tuning)에 관한 새로운 방법을 제안한다. 이 방법은 먼저 제어대상의 계단응답으로부터 모델링된 1차 지연계를 파데근사화하고, Ziegler-Nichols의 방법으로 초기값을 정한 후, 최대 오버슈트, 감쇠비, 상승시간, 정정시간을 포함하는 퍼지 평가함수를 최대로 하는 PID계수를 구함으로써 제어대상의 특성이나 부동작시간의 변화에도 적응성이 좋다는 장점이 있다. We propose a new method to deal with optimal auto-tuning of the PID controller which is used to process control in various fields. First of all, in this method, 1st order system which was modeled from the unit step response of the system is Pade-approximated, then initial values are determined by the Ziegler-Nichols method. Finally, we can find the parameters of PID controller so as to maximize the fuzzy criterion function which includes the maximum overshoot, damping ratio, rising time and settling time. The Proposed method also shows good adaptability for variations in characteristics and dead m e of the system.
이수흠,류상욱 慶南大學校 附設 工業技術硏究所 1992 硏究論文集 Vol.10 No.-
TV 화상의 ghost 제거는 현재까지 시행착오적인 방법에 의한 안테나 조정에 의존하여 왔다. 본 연구에서는 이런 점에 착안하여 TV 수신에서의 방해파 위상을 π/2 지연시킨 신호를 합성하는 방법에 의해 이를 제거할 수 있음을 보이고, 실험을 통하여 16㏈ 정도의 방해파 제거효과를 확인함으로써 그 효용성을 입증하였다. It could suppress the undesired signals by adjust the amplitude and phase shift with π/2 of the mixed field intensity that received by the combined system with two antenna which were installed in the constant distance to cancel an undesired signals. The characteristics of the system which were designed by the author were showed that it was cancelled the undesired signal about 16㏈ than the conventional antenna.