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김진용,김성열,이금원 한국융합신호처리학회 2003 융합신호처리학회 논문지 (JISPS) Vol.4 No.4
Due to the asymptotic property, deadbeat control which is well used in digital control system can not be applied to the continuous time system. But recently by use of the finite Laplace Transform to transfer function and establishment of some settling conditions, CDBC(Continuous time Deadbeat Control) is studied. For CDBC design, transfer function is constituted with delay elements and then order and interpolation conditions are derived. In other way, digital deadbeat controller is implemented and it's output is changed to continuous type by smoothing elements. In this paper multirate sampling is used and so inner controller is sampled faster than output feedback loop. And End order smoothing elements is placed to the output of digital deadbeat controller. By the multirate sampling overall output response is improved. The controller is impleneted as a serial integral compensator in the forward path and a local feedback compensator introduced into the outpute feedback loop. Matlab Simulink is used for simulation. 디지털제어에 잘 사용되어 온 유한정정제어를 연속계에 적용하기는 연속계의 점근성 때문에 어려운 것으로 알려져 있다. 그러나 유한 Laplace변환을 전달함수에 적용하고 여기에 정정조건을 적용하여 제어기를 설계한 연속계 유한정정제어기(CDBC, Continuous-time Deadbeat Controller)에 대해서 연구가 되고 있다. 이에 따라 지연요소가 전달함수에 사용되어 정정을 위한 차수 및 보간조건이 유도되어 제어기가 설계되거나, 디지털 유한정정제어기를 설계하고 이를 연속계 제어기로 변환하기 위해 평활요소로 사용하여 CDBC를 구성하기도 한다. 본 논문에서는 다중 샘플링을 적용하여 제어기와 출력귀환루프의 샘플링 속도를 달리하였으며, 2차 평활요소를 디지털 유한정정제어기에 사용한 CDBC를 연구한다. 이러한 다중 샘플링은 샘플링 주기 동안에 제어루프를 또 샘플링하여 전체적인 출력응답을 개선할 수 있다. 제어기는 직렬 적분 보상기를 전향경로에 배치하고 지역 귀환보상기를 귀환 루프에 도입한다. Matlab Simulink을 사용하여 시뮬레이션을 한다.
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김진용,김성열,이금원 한국융합신호처리학회 2002 융합신호처리학회 논문지 (JISPS) Vol.3 No.1
본 논문은 2차 평활요소를 사용한 최적 연속계 유한정정 서보시스템의 새로운 설계법을 제시한다. 직렬 적분 보상기와 지역 귀환보상기를 상태귀환 루프에 도입하여 연속유한정정제어기를 만든다. 평활요소의 감쇄비와 고유 각주파 수의 결정법을 서술한다. 입출력 특성이 어떻게 개선되는지를 수치예제를 통하여 보인다. 특히 임의의 시간에 인가되는 외란 및 가변 입력에 대한 CDBC를 설계하는 방법을 제시한다. This paper presents a new design method of optimal continuous deadbeat controller by using second-order smoothing elements. The continuous deadbeat controller is made of a serial integral compensator and a local feedback compensator introduced into the state feedback loop. The decision method of the damping factor and the natural angular frequency of the smoothing element is described. A numerical example is given to show how well input-output characteristics are improved. Especially according to the variable input and disturbance, corresponding CDBC design method is suggested. By computer simulations, control inputs and system outputs are shown to have desirable property such as smoothness.
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Compomer의 치면처리방법에 따른 전단 결합 강도에 관한 연구
김진용,홍찬의 大韓齒科保存學會 1998 Restorative Dentistry & Endodontics Vol.23 No.1
To evalutate the change in shear bond strength according to dentin surface treatment, 4 materials were divided into control group(A) and experimental group(B). Group A was treated according to the instruction of manufacture. Group B was treated with 32% phosphoric acid. After dentin surface treatment, each material was bonded and stored in 100% humidity during 7 days, and then, the shear bond strength was evaluated. The results were as follows : 1. In the case of treatment according to the instruction of manufacture, the shear bond strength according to material showed Z-100 to be highest with 12.42 MPa, Compoglass had the lowest shear bond strength with 4.23 MPa and there was significant difference between Compoglass and Z-100, Dyract (p<0.01). 2. The group treated with 32% phosphoric acid showed lower shear bond strength than that of the group treated according to the instruction of manufacture but there was no statistical significance. 3. As a result of observation under SEM, the fracture pattern was a mixture of cohesive and adhesive failure in group 1, and there was more adhesive failure in group 2, and in group 3 and 4 there was cohesive failure of material or tooth structure. From the results above Dyract showed shear bond strength levels between resin and resin-modified glass ionomer but Compoglass showed much lower shear bond strength than that of resin-modified glass ionomer thus indicating that even though they are the same type of material they show evident differences in physical properties. And it is thought that the treatment of dentin surface with phosphoric acid did not increase the shear bond strength, unlike enamel.
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EPDM계 내열재의 Al(OH)3와 Sb2O3 함량에 따른 난연 효과 연구
김진용,임대현,이원복 항공우주시스템공학회 2013 항공우주시스템공학회지 Vol.7 No.4
In order to improve incombustibility of EPDM(Ethylene propylene diene monomer)-based rubber, inorganic materials as Al(OH)3 and Sb2O3 were added. The mechanical and thermal properties have been measured for vulcanized rubber loaded with different concentrations of Al(OH)3 and Sb2O3. As inorganic material contents increases from 5phr to 30phr, the specific gravity and hardness increase while elongation at break decreases. This study performed incombustibility test and thermal analysis through TGA(Thermogravimetric Analyzer). As a results, incombustible and thermal properties of EPDM-based rubber were improved as Al(OH)3 and Sb2O3 contents increase.
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정신증 환자의 증상과 기능에 대한 간략형 평가 척도의 타당도 및 신뢰도
김진용,강시현,김수정,곽경현,김창윤 大韓神經精神醫學會 2007 신경정신의학 Vol.46 No.5
Objective : This study aimed to validate the Clinical Global Impression 5-factor (CGI-5 factor) scale and Personal and Social Performance scale (PSP), which are brief clinical global scales to assess the psychological symptoms and psychosocial fun-ctioning in patients with psychosis. Methods : The CGI-5 factor scale is composed of 5 items : CGI-Positive, Negative, Depressive, Excitement, and Cognitive. Concurrent validity and sensitivity to change were evaluated by comparing the CGI-5 factor scale with Positive and Negative syndrome Scale (PANSS) 5-dimension. Concurrent validity of PSP was compared with Global Assessment of Functioning (GAF) score and Psychosocial functioning (PSF) scales composed of selected items from Quality ofLife Scale (QLS), Fun-ctional Analysis of Care Environments (FACE), and Social-Adaptive Functioning Evaluation (SAFE). A total of 63 inpatients were enrolled in this study. To evaluate inter-rater reliability, 20 patients were assessed by two investigators. Results : The correlations between the CGI-5 factor scale and PANSS were significant on admission (0.507<r<0.814). The changes in CGI-5 factor scale from admission to discharge correlated with the changes in PANSS (0.530<r<0.882). PSP Sig-nificantly correlated with PSF and GAF (-0.804 <r<-0.408). Inter-rater reliability for CGI-5 factor scale (0.67<ICC<0.72) and for PSP (ICC>0.86) were in moderate to substantial range. Conclusion : This study confirmed the validity and reliability of the CGI-5 factor scale and PSP. Given its simplicity and brevity, these can be used to evaluate global symptoms and psychosocial functioning of psychotic patients in routine clinical practice.
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