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전성우 대한상부위장관ㆍ헬리코박터학회 2020 Korean Journal of Helicobacter Upper Gastrointesti Vol.20 No.2
Gastritis is the term used to describe the inflammatory condition of the stomach. However, the ambiguous application of this term in clinical practice, such as in endoscopic or histological diagnosis, makes its diagnosis and treatment unclear. Atrophic gastritis is the most common finding in screening endoscopy, especially in patients with high risk of gastric adenocarcinoma; thus, definite diagnosis of the premalignant condition is important. Several classification systems and associated terminologies have been used to define the inflammatory condition of the stomach. However, many of them are based on histological findings, and their clinical application is limited in endoscopic diagnosis. Recently, with the advancement of endoscopic imaging techniques such as narrow-band imaging, atrophy and intestinal metaplasia can now be defined more precisely. Currently, many attempts have been made to classify the condition of the stomach on the basis of endoscopic findings, focusing on the risk of gastric adenocarcinoma and the presence of Helicobacter pylori.
무인 잠수정의 깊이 제어를 위한 T-S 퍼지 모델 기반 H<sub>∞</sub> 제어기 설계: 선형 행렬 부등식 접근법
전성우,김도완,이호재,Jun, Sung-Woo,Kim, Do-Wan,Lee, Ho-Jae 한국지능시스템학회 2012 한국지능시스템학회논문지 Vol.22 No.4
This paper presents a design technique of a Takagi-Sugeno (T-S) fuzzy-model-based $H_{\infty}$ controller for autonomous underwater vehicles (AUVs). The design procedure aims to render the stabilizing controller which satisfies performance of the diving control for AUVs in the presence of the disturbance. A nonlinear AUV is modeled by the T-S fuzzy system through the sector nonlinearity. By using Lyapunov function, the sufficient conditions are derived to guarantee the performance of robust depth control in the format of linear matrix inequality (LMI). To succeed for diving control of AUV, we add the constraints on the diving and pitch angles in the LMI conditions. Through the simulation, we confirm the effectiveness of the proposed methodology. 본 논문은 무인 잠수정(Autonomous underwater vehicles: AUVs)의 타카기-수게노 (Takagi-Sugeno: T-S) 퍼지 모델 기반 $H_{\infty}$ 제어기 설계 기법을 제안한다. 설계 기법은 외란을 갖는 무인 잠수정의 깊이 제어 성능을 보장하는 안정성 있는 제어기 설계에 초점을 맞춘다. 비선형 무인 잠수정 시스템은 Sector nonlinearity 기법을 이용하여 T-S 퍼지 시스템으로 모델링된다. 리아푸노프(Lyapunov) 함수를 이용해 제어 성능을 보장하는 선형 행렬 부등식(linear matrix inequality: LMI) 형태의 $H_{\infty}$ 제어기 설계 조건을 유도한다. 성공적인 무인 잠수정의 깊이 제어를 위해 선형 행렬 부등식에 심도각과 피치각의 제한 조건을 고려한다. 시뮬레이션을 통해 제안된 기법의 성능을 검증한다.