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신경망-PID 제어기를 이용한 직류전동기의 속도제어에 관한 연구
박왈서,유인호,이성수 원광대학교 공업기술개발연구소 2003 工業技術開發硏究誌 Vol.23 No.-
Robust control for feedback control system is needed according to the highest precision of industrial automation. However, when a neural network feedback control system has an effect of disturbance, it is very difficult to guarantee the robustness of control system. As a compensation method solving this problem, in this paper, hybrid control method of neural network controller and PID controller is presented. A neural network controller is operated as a main controller, a PID controller is a assistant controller which operates only when some undesirable phenomena occur, e.q., when the error hit the boundary of constraint set. The robust control function of neural network-PID controller is demonstrated by speed control of Motor.
이소말토 올리고당의 첨가가 약과의 품질특성에 미치는 영향
김향숙,서월석,김은겸,이화영 충북대학교 교육 ·생활연구소 생활과학연구센터 2002 생활과학연구논총 Vol.6 No.2
This study was to develope low-calorie Yak-kwa by using oligosaccharides instead of honey. Sensory and instrumental textur properties of Yak-kwa were examined. The calorie of oligosaccharide Yak-kwa was 31% lower than honey Yak-kwa. Color of oligosaccharide Yak-kwa was lighter than that of honey Yak-kwa. Results of nstrumental test of texural proporties showed that hardness increased and cutting decreased as soaking time increased without significant differences between oligosaccharide Yak-kwa and honey Yak-kwa. Accepance test by sensoty panel showed no significant differences between oligosaccharid Yak-kwa and honey Yak-kwa.
박왈서(Wal-Seo Park),오훈(Hun Oh),유석주(Seok-Ju Yoo),라성훈(Seong-Hoon La) 한국조명·전기설비학회 2009 조명·전기설비학회논문지 Vol.23 No.2
PI제어기는 발전기의 전압제어 시스템에 널리 쓰이고 있다. 하지만 발전 시스템의 특성이 연속적으로 변화할 때, 새로운 PI매개변수를 결정하는 것이 쉽지 않다. 이를 해결하기 위하여 본 논문에서는 발전기의 전압제어에 신경망 자율 적응 제어를 이용하는 제어 방법을 제안하였다. 전압제어 시스템의 적절한 연속적인 궤환 제어 이득은 델타 학습 규칙에 의해서 결정된다. 제안된 제어 방법의 기능은 직류 발전기 전압제어 실험에 의해 확인하였다. PI controller is widely used as voltage control system of generator. However when a generator system has various characters of continuance, a new PI parameter decision for accurate control is a hard task. as method of solving this problem, in this paper, the method to generator voltage control using Neural Network self adaptive control is presented. A property continuous feedback control gain of voltage control system is decided by a rule of delta learning. The function of proposed control method is verified by voltage control experiment results of DC generator.
Kim, Wal Jun,Jang, Eui Yun,Seo, Dong Kyun,Kang, Tae June,Jin, Kyoung Cheol,Jeong, Dae Hong,Kim, Yong Hyup American Chemical Society 2010 Langmuir Vol.26 No.20
<P>A fabrication technique is developed for the preparation of metal oxide/CNT composites. An essential feature of the technique lies in the use of nonaqueous electrolyte in place of the usual aqueous electrolyte, which ensures well-dispersed CNTs without surfactants. After a “seed” is formed by electroplating on the anode, the seed is simply pulled up at a certain speed to grow a 1D CNT composite structure. The technique leads to a uniform distribution of metal oxide and a high weight fraction of CNT in the composite structure. Moreover, the conductivity of the composite is much higher than that of the CNT fibers fabricated with polymer.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/langd5/2010/langd5.2010.26.issue-20/la101358q/production/images/medium/la-2010-01358q_0006.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/la101358q'>ACS Electronic Supporting Info</A></P>
Better than 10 mA Field Emission from an Isolated Structure Emitter of a Metal Oxide/CNT Composite
Kim, Wal Jun,Lee, Jeong Seok,Lee, Seung Min,Song, Ki Young,Chu, Chong Nam,Kim, Yong Hyup American Chemical Society 2011 ACS NANO Vol.5 No.1
<P>An isolated structure emitter is presented that can deliver a field emission better than 10 mA, a level that is by far the highest ever reported. A composite of CNT (carbon nanotube) and WO<SUB>3</SUB> is used to grow the point emitter by a crystal-like growth technique. The head of the grown needle that is the emitter is removed by electric discharge machining (EDM). The EDM treatment not only controls the length of the emitter as desired but also makes the tip of the emitter uniform. The thermal heat due to EDM treatment leads to the formation of a tungsten carbide phase, which results in a 3 orders of magnitude reduction in contact resistance. The point emitter is robust in its stability, as evidenced by its on-time resilience against a severe bias test.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/ancac3/2011/ancac3.2011.5.issue-1/nn101956w/production/images/medium/nn-2010-01956w_0006.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nn101956w'>ACS Electronic Supporting Info</A></P>
한국 무용의 해외 진출 양상 및 활성화 방안 : 서울아트마켓(PAMS)을 중심으로
정재왈 ( Jung Jae-wal ) 한국무용예술학회 2015 무용예술학연구 Vol.56 No.5
This study has two objectives. Firstly, it examines the aspects of overseas expansion of Korean dance groups focusing on PAMS. Secondly, it discusses how Korean dance groups can advance to overseas market more positively in the future. The works selected by PAMS for 10 years from 2005 to 2014 were 150 pieces in total. Among these works, dance was the largest field with 49 pieces compared to theater and music. The researcher proposes four things for overseas expansion of Korean dance. ①Fully know the government's support system for overseas expansion. ②Concentrate on researching a network for capturing a target market. ③Get a help from an international exchange expert. ④ Have a scale of performance group suitable for overseas performance and cope sensitively with a change in international trend.
DYNAMIC CHARACTERISTICS OF CYLINDRICAL SHELLS CONSIDERING FLUID-STRUCTURE INTERACTION
정명조,WAL TAE KIM,YONG HO RYU 한국원자력학회 2009 Nuclear Engineering and Technology Vol.41 No.10
To assure the reliability of cylinders or shells with fluid-filled annulus, it is necessary to investigate the modal characteristics considering fluid-structure interaction effect. In this study, theoretical background and several finite element models are developed for cylindrical shells with fluid-filled annulus considering fluid-structure interaction. The effect of the inclusion of the fluid-filled annulus on the natural frequencies is investigated, which frequencies are used for typical dynamic analyses such as responses spectrum, power spectral density and unit load excitation. Their response characteristics are addressed with respect to the various representations of the fluid-structure interaction effect.