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노철우(Ro Cheul Woo),김경민(Kim Kyung Min),폴 무두시(Paul Muthusi) 한국콘텐츠학회 2007 한국콘텐츠학회 종합학술대회 논문집 Vol.5 No.2_1
동적 전력 관리는 서로 다른 전력소모를 갖는 전력상태들을 시스템 구성 요소에 할당하고 상황별로 전력상태를 관리함으로써 시스템의 전력 소모를 현저하게 줄여줄 수 있다. 전력관리의 주 기능은 구성요소의 상태천이를 언제 수행하느냐 이며 이를 위하여 추계적 프로세스에 기반한 동적 전력관리 모델을 개발한다. 동적 모델은 시스템 큐와 다양한 모델링 기능을 표현할 수 있는 페트리 네트의 확장형인 SRN(Stochastic Reward Nets)을 이용하여 개발되며 성능분석을 함께 수행한다. Dynamic power management reduces the power consumption of the system by switching system components into different power states, which have different power consumption levels. The main function of a power management is to decide when to perform state transitions. In this paper, a power management model based on stochastic processes is introduced. This model is developed using SRN (Stochastic Reward Nets), which has facilities to represent system queue and various modeling functions.
Study on a Ultra-light Dual Revolute Manipulator with High Joint Torque
최형식,김태형,문웅주,Paul I. Ro 한국정밀공학회 2009 International Journal of Precision Engineering and Vol.10 No.4
This paper details a study performed on a new proposed twelve degree-of-freedom dual robot arm, which is very light but capable of handling heavy loads. The proposed robot arm has a higher value for the ratio of the load capacity/robot weight than conventional robot arms, which are actuated by motors with speed reducers, such as a harmonic drives, since it adopts a new type of robot actuator based on a closed chain mechanism. Because of the high value of the ratio of the payload capacity/robot weight, it can be used as a robot arm for mobile robots and for walking robots. Analyses of the design scheme and of the mechanism of the joint actuator used for the robot arm are presented. Also, the control system developed for the robot arm is introduced. The superior characteristics of the new proposed robot arm, handling heavy payloads with light weight links compared to industrial robots, are presented through carrying out various payload capacity tests. Since the robot arm is designed with light links, it has some deflections and these deflections of the links are analyzed using the Finite Element Method (FEM). The results of performance tests are presented to check the correctness of the FEM analysis and to demonstrate the actual capability of handling heavy payloads applied to the robot arm.
( Chan Jae Park ),( Moon Young Lee ),( Paul J Park ),( Se Eun Ha ),( Robyn M Berent ),( Robert Fuchs ),( Joseph M Miano ),( Laren S Becker ),( Kenton M Sanders ),( Seung Il Ro ) 대한소화기기능성질환·운동학회 2015 Journal of Neurogastroenterology and Motility (JNM Vol.21 No.4
Background/Aims Smooth muscle cells (SMCs) characteristically express serum response factor (SRF), which regulates their development. The role of SRF in SMC plasticity in the pathophysiological conditions of gastrointestinal (GI) tract is less characterized. Methods We generated SMC-specific Srf knockout mice and characterized the prenatally lethal phenotype using ultrasound biomicroscopy and histological analysis. We used small bowel partial obstruction surgeries and primary cell culture using cell-specific enhanced green fluorescent protein (EGFP) mouse lines to study phenotypic and molecular changes of SMCs by immunofluorescence, Western blotting, and quantitative polymerase chain reaction. Finally we examined SRF change in human rectalprolapse tissue by immunofluorescence. Results Congenital SMC-specific Srf knockout mice died before birth and displayed severe GI and cardiac defects. Partial obstruction resulted in an overall increase in SRF protein expression. However, individual SMCs appeared to gradually lose SRF in the hypertrophic muscle. Cells expressing low levels of SRF also expressed low levels of platelet-derived growth factor receptor alpha (PDGFRalow) and Ki67. SMCs grown in culture recaptured the phenotypic switch from differentiated SMCs to proliferative PDGFRalow cells. The immediate and dramatic reduction of Srf and Myh11 mRNA expression confirmed the phenotypic change. Human rectal prolapse tissue also demonstrated significant loss of SRF expression. Conclusions SRF expression in SMCs is essential for prenatal development of the GI tract and heart. Following partial obstruction, SMCs down-regulate SRF to transition into proliferative PDGFRalow cells that may represent a phenotype responsible for their plasticity. These findings demonstrate that SRF also plays a critical role in the remodeling process following GI injury. (J Neurogastroenterol Motil 2015;21:589-602)
Cerebral Blood Volume Affects Blood-Brain Barrier Integrity in an Acute Transient Stroke Model
Huang, Shuning,Kim, Jeong Kon,Atochin, Dmitriy N,Farrar, Christian T,Huang, Paul L,Suh, Ji Yeon,Kwon, Seon Joo,Shim, Woo Hyun,Cho, Hyungjoon,Cho, Gyunggoo,Kim, Young Ro SAGE Publications 2013 Journal of cerebral blood flow and metabolism Vol.33 No.6
<P> Insufficient vascular reserve after an ischemic stroke may induce biochemical cascades that subsequently deteriorate the blood-brain barrier (BBB) function. However, the direct relationship between poor cerebral blood volume (CBV) restoration and BBB disruption has not been examined in acute stroke. To quantify BBB integrity at acute stages of transient stroke, in particular for cases in which extravasation of the standard contrast agent (Gd-DTPA) is not observed, we adopted the water exchange index (WEI), a novel magnetic resonance image-derived parameter to estimate the water permeability across the BBB. The apparent diffusion coefficient (ADC) and R2 relaxation rate constant were also measured for outlining the tissue abnormality, while fractional CBV and WEI were quantified for assessing vascular alterations. The significantly decreased ADC and R2 in the ischemic cortices did not correlate with the changes in CBV or WEI. In contrast, a strong negative correlation between the ipsilesional WEI and CBV was found, in which stroke mice were clustered into two groups: (1) high WEI and low CBV and (2) normal WEI and CBV. The low CBV observed for mice with a disrupted BBB, characterized by a high WEI, indicates the importance of CBV restoration for maintaining BBB stability in acute stroke. </P>