131,315 research outputs found
Kim Cheol-Joong
No full text학위논문(박사)--아주대학교 일반대학원 :전자공학과,2014. 8DoctoralAlthough considering the uncertainties and constraints is very important, it is very hard to consider them by using the previous control methods due to the difficulty of the controller design and analysis. On the other hand, the recently developed SOS-based control methods provided the motivation to study the systems with the uncertainties and constraints. By using the numerical analysis, SOS approach can not only construct the controller but also can show the stability for the systems with the uncertainties and constraints. With this in mind, SOS-based control methods against the uncertainties and constraints for nonlinear systems are proposed and the practical problem in the control area such as the synchronization of chaotic system, tracking control of wheeled mobile robot, and range estimation of camera system will be studied in this dissertation.
Firstly, the synchronization problem for unified chaotic system with mismatched parameters are handled. The error dynamics are expressed in the form of polynomial and the controller is designed to stabilize the error dynamics by SOS approach. The mismatched parameters which can be considered as the system uncertainties are compensated by the adaptive law.
Secondly, the range estimation problem for camera system is solved by using the camera dynamics unlike the previous linear algebraic methods. Based on the camera dynamics which can be represented as the polynomial form, SOS-based state observer is designed to estimate the distance between the camera and the object along Z axis.
Thirdly, the trajectory tracking control method of the wheeled mobile robot in presence of the input constraints are proposed. The tracking problem is transformed as the stabilization problem by dividing the control inputs as the feedforward and the feedback terms. The control inputs to stabilize the error are obtained by the SOS approach. In this procedure, the fuzzy method is employed to consider the input constraints of the wheeled mobile robot in analytic way.
Finally, the controller considering the input rate constraints in the systems are proposed. To this end, a new state variable which consists of the system states and the control input is defined and the augmented polynomial model is derived. In this augmented model, the input magnitude and rate constraints in the original system can be considered as the state and input magnitude constraints, respectively. In this way, we can consider the system state, input magnitude, and input rate constraints
Jae Won Kim, piano, Yun Jeong Kim, violin, Thursday, May 10, 2007
No full textJae Won Kim- "In partial fulfillment of the requirements for the degree of Doctor of Musical Arts"Yun Jeong Kim- "In partial fulfillment of the requirements for the degree of Doctor of Musical Arts
Cheol Woong Kim, In Search of Freedom, An Evening of Music and Conversation, October 8, 2008
No full textThis is the concert program of the In Search of Freedom, An Evening of Music and Conversation performance on Wednesday, October 8, 2008 at 7:30 p.m., at the Tsai Performance Center, 685 Commonwealth Avenue, Boston, Massachusetts. Works performed were Nocturne in C sharp minor, Op. Posth by Frédéric Chopin, Piano Concerto No. 21 in C Major, K. 467 "Elvira Madigan" by Wolfgang Amadé Mozart, Chosun is One by Dong Choon Sung, Voices Yet Unheard by Sung Eun Han-Andersen, and Arirang Sonata and In Search of Freedom by Cheol Woong Kim. Digitization for Boston University Concert Programs was supported by the Boston University Center for the Humanities Library Endowed Fund
Jae Ho Kim
No full text학위논문(박사)--아주대학교 일반대학원 :의학과,2010. 2TABLE OF CONTENTS
ABSTRACT ⅰ
TABLE OF CONTENTS ⅲ
LIST OF FIGURES ⅴ
ABBREVIATION ⅶ
Ⅰ. INTRODUCTION 1
Ⅱ. MATERIALS AND METHODS 3
1. Cell culture 3
2. In vivo protocol of experimental tumor models 3
3. In vitro and in vivo cell proliferation assays 4
4. In vivo analysis of tumor-tropism of human neural stem cells 5
5. X-gal stain 6
6. Cell count and unbiased stereology in a tumor region of rats 7
7 .Cell count and unbiased stereology in a entire brain of rats 8
8. Labeling of F3 Cells with 5-bromo-2-deoxyuridine 8
9. Hematoxylin and Eosin stain 9
10. Beta-galactosidase immunofluoresecence 9
11. Statistical Analysis 10
Ⅲ. RESULTS 11
1. Tumor-tropism pattern of NSCs 11
2. Migration rate of NSCs 19
3. NSC migration studied by stereology 23
4. Histological analysis 28
5. Proliferation of NSCs in vitro & in vivo 32
Ⅳ. DISCUSSION 37
Ⅴ. CONCLUSION 43
RFERENCES 45
국문요약 58Maste
Experience Goods, Expectations and Pricing
No full textThis paper studies a peculiar problem involved in the pricing of an ‘experience good’ whose value is not known to consumers until it is actually consumed It shows that the producer faces an expectational problem that does not arise in the framework of a ‘search good’. Noticing a link between markets in earlier and later periods due to the expectational problem, the present paper analyzes equilibrium price patterns when a producer can precommit to a certain future price path and when he cannot It also discusses social welfare implications
DURABLE GOOD MONOPOLY, FINITE DURABILITY AND TRIGGER TIME-CONSISTENT EQUILIBRIUM
No full textThis paper analyzes the problem of durable good monopoly facing linear demand function when the good decays in a one-hoss-shay fashion. It is shown that under certain conditons there can exist a time-consistent equilibrium which resembles the trigger strategy equilibrium in the repeated games.
Supplemental material for Growth rate of serous pancreatic neoplasms in vivo: a retrospective, observational study
No full textSupplemental material for Growth rate of serous pancreatic neoplasms in vivo: a retrospective, observational study by Chan Park, Hyoung Jung Kim, So Yeon Kim, Seung Soo Lee, Jae Ho Byun, Song Cheol Kim and Myung-Hwan Kim in Acta Radiologica</p
Durable good monopoly with one-hoss-shay depreciation
No full textThis paper analyzes the effects of one-hoss-shay depreciation on the equilibrium stock path in a monopoly market for a durable good. It is shown that the stock path oscillates, converging to a stationary level lower than the competitive level
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