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Kalman Filter-based Fault Detection and Isolation of Direct Current Motor
TaeDong, Park,kiheon, Park 제어로봇시스템학회 2008 제어로봇시스템학회 국제학술대회 논문집 Vol.2008 No.10
In recent years, as engineering systems have increased in complexity, aspects of reliability and safety are attracting more and more attention. Improved methods for detecting and isolating faults in engineering systems are of great practical importance. Traditional approaches to these methods have involved the limit checking of variables or applications of redundant sensors. More advanced methods have used residual analysis of signals by means of a comparing of actual plant behavior with the characteristics of a mathematical model. However, fault detection can be problematic because an “"unknown uncertainty”" is difficult to express in terms of a mathematical model. If these uncertainties can be considered, errors in fault detection and isolation in physical systems can be reduced. Therefore, this paper assesses a system’"s state after eliminating uncertainty with the kalman filter, and uses the experiment results to analyze and evaluate the performance of fault detection and isolation for a direct current motor.
Decoupling Controller Design for H<sub>∞</sub> Performance Condition
Taedong Park,Goon-Ho Choi,Yong-Seok Cho,Kiheon Park 대한전기학회 2011 Journal of Electrical Engineering & Technology Vol.6 No.6
The decoupling design for the one-degree-of-freedom controller system is treated within the H<sub>∽</sub> framework. In the present study, we demonstrate that the H<sub>∽</sub> performance problem in the decoupling design is reduced into interpolation problems on scalar functions. To guarantee the properness of decoupling controllers and the overall transfer matrix, the relative degree conditions on the interpolating scalar functions are derived. To find the interpolating functions with relative degree constraints, Nevanlinna-Pick algorithm with starting function constraint is utilized in the present study. An illustrative example is given to provide details regarding the solution.
Sliding Mode Control Based on Pole-Placement Method for Position Control of Linear Stage
TaeDong, Park,kiheon, Park 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
The sliding mode control method is one of the robust control techniques and a particular type of variable structure control. Sliding mode control can change the system performance on the switching surface. In this paper, a sliding surface design method using the pole-placement method for the sliding mode control and then experimentally analyzes the advantage to this method when used in a linear position system. Also, this control input with chattering behavior is not acceptable for systems intended to control electric motors and power converters. One possible solution in this paper is to make use of the sigmoid-like function instead of signum function.
박태동(TaeDong Park),이재호(Jeaho Lee),백산림(Shanlin Bai),박기헌(Kiheon Park) 대한전기학회 2008 정보 및 제어 심포지엄 논문집 Vol.2008 No.1
Demand for reliability and safety in modem systems has been increased in the research on fault detection and isolation. At traditional approaches to fault detection, redundant sensors have been used. More advanced methods are the residual analysis of signals which are created by the comparison between the actual plant behavior and the output response of a mathematical model. However, mathematical system models are difficult to obtain by using physical laws. These problems can be solved by system identification. In this paper, the transfer function of a direct current motor is estimated by using the system identification. And, the efficiency of the fault detector design is verified by using experiments.
CAN 시간지연에 대한 아라고 진자의 위치제어 성능분석
박태동(Taedong Park),이재호(Jeaho Lee),윤수진(Sujin Youn),박기헌(Kiheon Park) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.10
In this paper, the position control performance of networked control systems is analyzed when time delay through the network is considered. Integrating a control system into a network has great advantages over the traditional control system which uses point to point connection: it allows remarkable reduction in wiring, makes it easy to install and maintain the system, and improves compability. However, a networked control system has the critical defect that network uncertainties. such as time delay, can degrade the control system's performance. Therefore, the major concern of a networked control system is analyzing the effect of network uncertainties. This paper is concerned with PID controller performance for stability region, critical stability region and unstability region under the time delay in the Controller Area Network.
( Taedong Han ),( Byoung Moon Lee ),( Yoo Hoi Park ),( Dong Hoon Lee ),( Hyun Ho Choi ),( Taehoon Lee ),( Hakwon Kim ) 한국응용약물학회 2018 Biomolecules & Therapeutics(구 응용약물학회지) Vol.26 No.2
G protein-coupled receptor 119 (GPR119) is expressed in the pancreas and gastrointestinal tract, and its activation promotes insulin secretion in the beta cells of the pancreatic islets as well as the secretion of glucagon-like peptide-1 (GLP-1) in intestinal L cells, consequently improving glucose-stimulated insulin secretion. Due to this dual mechanism of action, the development of small-molecule GPR119 agonists has received significant interest for the treatment of type 2 diabetes. We newly synthesized 1,2,4-triazolone derivatives of GPR119 agonists, which demonstrated excellent outcomes in a cyclic adenosine monophosphate (cAMP) assay. Among the synthesized derivatives, YH18968 showed cAMP=2.8 nM; in GLUTag cell, GLP-1secretion=2.3 fold; in the HIT-T15 cell, and insulin secretion=1.9 fold. Single oral administration of YH18968 improved glucose tolerance and combined treatment with a dipeptidyl peptidase 4 (DPP-4) inhibitor augmented the glucose lowering effect as well as the plasma level of active GLP-1 in normal mice. Single oral administration of YH18968 improved glucose tolerance in a diet induced obese mice model. This effect was maintained after repeated dosing for 4 weeks. The results indicate that YH18968 combined with a DPP-4 inhibitor may be an effective therapeutic candidate for the treatment of type 2 diabetes.
Han, Taedong,Lee, Byoung Moon,Park, Yoo Hoi,Lee, Dong Hoon,Choi, Hyun Ho,Lee, Taehoon,Kim, Hakwon The Korean Society of Applied Pharmacology 2018 Biomolecules & Therapeutics(구 응용약물학회지) Vol.26 No.2
G protein-coupled receptor 119 (GPR119) is expressed in the pancreas and gastrointestinal tract, and its activation promotes insulin secretion in the beta cells of the pancreatic islets as well as the secretion of glucagon-like peptide-1 (GLP-1) in intestinal L cells, consequently improving glucose-stimulated insulin secretion. Due to this dual mechanism of action, the development of small-molecule GPR119 agonists has received significant interest for the treatment of type 2 diabetes. We newly synthesized 1,2,4-triazolone derivatives of GPR119 agonists, which demonstrated excellent outcomes in a cyclic adenosine monophosphate (cAMP) assay. Among the synthesized derivatives, YH18968 showed cAMP=2.8 nM; in GLUTag cell, GLP-1secretion=2.3 fold; in the HIT-T15 cell, and insulin secretion=1.9 fold. Single oral administration of YH18968 improved glucose tolerance and combined treatment with a dipeptidyl peptidase 4 (DPP-4) inhibitor augmented the glucose lowering effect as well as the plasma level of active GLP-1 in normal mice. Single oral administration of YH18968 improved glucose tolerance in a diet induced obese mice model. This effect was maintained after repeated dosing for 4 weeks. The results indicate that YH18968 combined with a DPP-4 inhibitor may be an effective therapeutic candidate for the treatment of type 2 diabetes.