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인공 신경망 모델링을 통한 Proton Exchange Membrane Fuel Cell 비선형 모델 예측 제어
조영탁,황성원 한국공업화학회 2020 한국공업화학회 연구논문 초록집 Vol.2020 No.-
연료전지 모델링은 복잡한 내부 모델이 적용되어 많은 계산량이 요구되기에 실시간 최적화에 어려움이 존재한다. 따라서, 본 연구에서는 연료전지의 기존 물리적 모델을 대체하는 인공 신경망 모델을 적용하여 모델예측제어 시스템을 개발하였다. 이를 위해서, 양성자교환막 연료전지의 확률적 멀티스케일 모델링을 진행한 후에, 다양한 운전 시나리오를 적용하여 운전 데이터를 생성하였다. 도출된 운전 데이터를 사용하여 연료전지의 동적 거동을 모사하는 인공 신경망 모델을 개발하였다. 인공신경망 모델과 최적화 알고리즘의 결합을 통해 연료전지의 실시간 전력 사용량 변화와 비상 시나리오에 대한 운전 전략을 구축하는 제어 시스템을 설계하였다. 마지막으로, Set-point tracking과 Disturbance rejection을 통해 시스템의 성능을 검증하였다.
조영탁,주성우,이중선,주연호 대한신경정신의학회 2019 신경정신의학 Vol.58 No.3
Objectives Several studies have delineated the relationship between hearing disturbances and the prevalence or characteristics of psychotic symptoms; however, most of those studies focused on psychiatric patients and not general inpatients. Delirium has a high incidence among general inpatients, and patients with delirium are easily affected by psychotic symptoms that lead to irritable behaviors. This study examined the relationship between hearing disturbance and psychotic symptoms among patients with delirium. Methods At the Asan Medical Center in Seoul, South Korea, this study examined 27 inpatients who had both delirium and hearing disturbances between January 1, 2009 and December 31, 2018, and 146 inpatients at the Asan Medical Center who had delirium but no hearing disturbances between July 1, 2018 and December 31, 2018. This study investigated whether the two groups showed differences in the prevalence and characteristics of delirium symptoms, particularly psychotic symptoms. In addition, the correlation between clinical characteristics of delirium and the recommended dosage of antipsychotics was analyzed in patients who had been diagnosed with delirium and had hearing disturbances. Results Compared to inpatients who only had delirium, those who had both delirium and hearing disturbances had a significantly higher prevalence of hallucination and delusion. Conclusion The prevalence of psychotic symptoms, such as hallucination and delusion, was higher in patients who had both delirium and hearing disturbances, which is in line with the results from previous studies on psychiatric patients. Physicians should focus on improving communication with such patients by employing non-verbal communication methods.