• Title/Summary/Keyword: r-closure

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A Study on the Analysis of Stochastic Dynamic System (확률적 동적계의 해석에 관한 연구)

  • Nam, S.H.;Kim, H.R.
    • Journal of the Korean Society for Precision Engineering
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    • v.12 no.4
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    • pp.127-134
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    • 1995
  • The dynamic characteristics of a system can be critically influenced by system uncertainty, so the dynamic system must be analyzed stochastically in consideration of system uncertainty. This study presents a generalized stochastic model of dynamic system subjected to bot external and parametric nonstationary stochastic input. And this stochastic system is analyzed by a new stochastic process closure method and moment equation method. The first moment equation is numerically evaluated by Runge-Kutta method. But the second moment equation is founded to constitute an infinite coupled set of differential equations, so this equations are numerically evaluated by cumulant neglect closure method and Runge-Kutta method. Finally the accuracy of the present method is verified by Monte Carlo simulation.

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Transcatheter Closure of a Residual Shunt after Surgical Repair of Traumatic Ventricular Septal Defect (외상성 심실중격결손 수술 후 잔존하는 심실중격결손에 대한 중재적 심도자술을 이용한 폐쇄)

  • Jeong, Hee Jeong;Lim, Han Hyuk;Yu, Jae Hyun;Lee, Jae Hwan;Kil, Hong Ryang
    • Clinical and Experimental Pediatrics
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    • v.48 no.10
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    • pp.1143-1143
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    • 2005
  • The traumatic ventricular septal defect (VSD) is a rare but potentially life threatening complication of chest wall injury. The traumatic VSD occurs in up to 4.5% of penetrating cardiac trauma. Most of the patients are usually operated on because of heart failure and/or significant left-to-right shunt. The feasibility of surgical repair under cardiopulmonary bypass may be affected by coexisting pulmonary, cerebral or other vascular injuries. Transcatheter closure of VSD is being considered as an alternative therapeutic modality to surgery in order to avoid the potential risk of cardiopulmonary bypass. We report a patient who underwent a successful transcatheter closure of VSD with an $Amplatzer^{(R)}$ VSD occluder. The patient had a residual VSD with significant left-to-right shunt after surgical repair of post-traumatic VSD using cardiopulmonary bypass.

APPLICATION OF ARTIFICIAL DERMIS($Terudermis^{(R)}$) AND SPLIT THICKNESS SKIN GRAFT ON THE DONOR SITE OF RADIAL FOREARM FLAP (인공진피($Terudermis^{(R)}$)와 부분층 피부이식을 이용한 전완피판 공여부 수복)

  • Oh, Jung-Hwan
    • Maxillofacial Plastic and Reconstructive Surgery
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    • v.29 no.3
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    • pp.227-232
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    • 2007
  • The radial forearm fasciocutaneous flap(RFFF) is a well-known flap for the reconstruction of oral and maxillofacial defects. It was first described by Yang et al. in 1981 and Soutar et al. developed it for the reconstruction of intraoral defect. RFFF provides a reliable, thin, and pliable soft tissue/skin paddle that is amenable to sensate reconstruction. It also has a long vascular pedicle that can be anastomosed to any vessel in either the ipsilateral or contralateral neck. However, split thickness skin graft(STSG) is most commonly used to cover the donor site, and a variety of donor site complications have been reported, including delayed healing, swelling of the hand, persistent wrist stiffness, reduced hand strength, and partial loss of the graft with exposure of the forearm flexor tendon. Various methods for donor site repair in addition to STSG have been developed and practiced to minimize both functional and esthetic morbidity, such as direct closure, V-Y closure, full thickness skin graft, tissue expansion, acellular dermal graft. We got a good result of using artificial dermis($Terudermis^{(R)}$) and secondary STSG for the repair of RFFF donor site defect esthetically and report with a review of literature.

ON RELATIONSHIPS AMONG INTUITIONISTIC FUZZY APPROXIMATION OPERATORS, INTUITIONISTIC FUZZY TOPOLOGY AND INTUITIONISTIC FUZZY AUTOMATA

  • Tiwari, S.P.
    • Journal of applied mathematics & informatics
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    • v.28 no.1_2
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    • pp.99-107
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    • 2010
  • This paper is a study about the relationships among topologies and intuitionistic fuzzy topology induced, respectively, by approximation operators and an intuitionistic fuzzy approximation operator associated with an approximation space (X, R), when the relation R on X is precisely reflexive and transitive. In particular, we consider an intuitionistic fuzzy approximation operator on an approximation space X (i.e., a set X with a reflexive and transitive relation on it), which turns out to be an intuitionistic fuzzy closure operator. This intuitionistic fuzzy closure operator gives rise to two saturated fuzzy topologies on X and it turns out that all the level topologies of one of the fuzzy topology coincide and equal to the topology analogously induced on X by a crisp approximation operator. These observations are then applied to intuitionistic fuzzy automata.

Extracellular Polymeric Substances of Pseudomonas chlororaphis O6 Induce Systemic Drought Tolerance in Plants

  • Cho, Song Mi;Anderson, Anne J.;Kim, Young Cheol
    • Research in Plant Disease
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    • v.24 no.3
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    • pp.242-247
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    • 2018
  • Pseudomonas chlororaphis O6 induces systemic tolerance in plants against drought stress. A volatile, 2R, 3R-butanediol, produced by the bacterium causes partial stomatal closure, thus, limiting water loss from the plant. In this study, we report that applications of extracellular polymeric substances (EPS) from P. chlororaphis O6 to epidermal peels of leaves of Arabidopsis thaliana also reduce the size of stomatal openings. Growth of A. thaliana seedlings with applications of the EPS from P. chlororaphis O6 reduced the extent of wilting when water was withheld from the plants. Fluorescence measurements showed photosystem II was protected in the A. thaliana leaves in the water stressed EPS-exposed plants. These findings indicate that P. chlororaphis O6 has redundancy in traits associated with induction of mechanisms to limit water stress in plants.

Development of Database and QA Systems for Post Closure Performance Assessment on A Potential HLW Repository

  • Hwang, Y-S;Kim, S-G;Kang, C-H
    • Nuclear Engineering and Technology
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    • v.34 no.4
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    • pp.406-414
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    • 2002
  • In TSPA of long-term post closure radiological safety on permanent disposal of HLW in Korea, appropriate management of input and output data through QA is necessary. The robust QA system is developed using the T2R3 principles applicable for five major steps in R&D's. The proposed system is implemented in the web-based system so that all participants in TSPA are able to access the system. In addition, the internet based input database for TSPA is developed. Currently data from literature surveys, domestic laboratory and field experiments as well as expert elicitation are applied for TSPA.

The effects of 3.5% NaCl solution on the corrosion fatigue crack propagation characteristics of SS41 steel (SS41강의 부식피로 균열 전파특성에 미치는 3.5% NaCl수용액의 영향)

  • 오세욱;김재철;최영수
    • Journal of Ocean Engineering and Technology
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    • v.1 no.1
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    • pp.111-119
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    • 1987
  • The corrosion fatigue crack propagation characteristics of SS41 steel in 3.5% NaCl solution have been evaluated for loading frequencies of 1Hz and 0.2Hz. A sine wave loading profile was used for fatigue testing. Each test was carried out at a constant stress ratio, R(0.1). The main results are summarized as follows; 1. Fatigue crack propagation rate was higher in 3.5% NaCl solution than in air, higher in the base metal than in the weld metal, and higher at f =0.2Hz than at f =1Hz. 2. The crack closure level of the base metal was not influenced by cyclic frequencies, but that of the weld metal was much influenced. 3. When the crack closure effect was eliminated in the evaluation of crack propagation characteristics by using $\Delta K_{eff}$, the envirommental influence was distinctly observed. At the base metal, crack propagation rate was enhanced by the hydrogen embrittlement, and the weld metal was reduced by the crac closure. 4. There was clearly observed hydrogen embrittlement and severely corroded aspect at fracture surface of lower frequency than that of higher frequency, and at that of base metal than that of the weld metal.

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JORDAN ALGEBRAS ASSOCIATED TO T-ALGEBARS

  • Jang, Young-Ho
    • Bulletin of the Korean Mathematical Society
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    • v.32 no.2
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    • pp.179-189
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    • 1995
  • Let $V \subset R^n$ be a convex homogeneous cone which does not contain straight lines, so that the automorphism group $$ G = Aut(R^n, V)^\circ = { g \in GL(R^n) $\mid$ gV = V}^\circ $$ ($\circ$ denoting the identity component) acts transitively on V. A convex cone V is called "self-dual" if V coincides with its dual $$ (1.1) V' = { x' \in R^n $\mid$ < x, x' > > 0 for all x \in \bar{V} - {0}} $$ where $\bar{V}$ denotes the closure of V.sure of V.

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SOME ONE-DIMENSIONAL NOETHERIAN DOMAINS AND G-PROJECTIVE MODULES

  • Kui Hu;Hwankoo Kim;Dechuan Zhou
    • Bulletin of the Korean Mathematical Society
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    • v.60 no.6
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    • pp.1453-1461
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    • 2023
  • Let R be a one-dimensional Noetherian domain with quotient field K and T be the integral closure of R in K. In this note we prove that if the conductor ideal (R :K T) is a nonzero prime ideal, then every finitely generated reflexive (and hence finitely generated G-projective) R-module is isomorphic to a direct sum of some ideals.

Clinical Experience of $VNUS^{(R)}Closure$ fast in Treatment of Varicose Vein: Comparison with Traditional Radiofrequency Ablation (하지정맥류 치료를 위한 2세대 고주파 열폐쇄술($VNUS^{(R)}Colosure$ fast)과 기존의 고주파 열폐쇄술($VNUS^{(R)}Closure$ plus)의 임상치험 비교 분석)

  • Kim, Woo-Shik;Lee, Jeong-Sang;Jeong, Seong-Cheol;Shin, Vong-Chul
    • Journal of Chest Surgery
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    • v.43 no.6
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    • pp.635-641
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    • 2010
  • Background: Radiofrequency endovenous ablation of incompetent saphenous vein has gaining popularity over the conventional ligation and stripping as a minimally invasive technique. The latest version of radiofrequency endovenous catheter, $VNUS^{\circledR}Colosure$ fast VNUS medical Technologies, San Jose, CA, adopted a segmental ablation system, instead of continous pullback, is designed to reduce treatment time in comparison with the previous model $VNUS^{\circledR}Colosure$ plus VNUS medical Technologies, San Jose, CA. The purpose of this study is to compare the difference between two endovenous radiofrequency ablation systems in terms of treatment efficacy and complication rates. We analyze the initial efficacy and complication rates of $VNUS^{\circledR}Colosure$ fast with $VNUS^{\circledR}Colosure$ plus. Material and Method: Between June 2006 and August 2009, $VNUS^{\circledR}Colosure$ plus was performed to treat varicose vein on 59 limbs in 41. patients and $VNUS^{\circledR}Colosure$ fast was performed on 76 limbs in 67 patients. We retrospectively compared in both group with sex, mean treatment time, mean treatment diameter, conjugated treatment, and complications after the procedure. Result: All patient were symptomatic and diagnosed as varicose vein and underwent level 2 clinical classification with color duplex scan. The mean treatment time for the great saphenous vein was significantly less with $VNUS^{\circledR}Colosure$ fast ($17.0{\pm}6.5min$) than $VNUS^{\circledR}Colosure$ plus ($62.7{\pm}9.8min$). There was no significant difference in 1 yr closure rate between groups (p=0.32). Minor complications such as skin burn, thrombophlebitis, ecchymosis, hematoma, cellulitis, tenderness, and there were not different between the groups. Conclusion: Both $VNUS^{\circledR}Colosure$ fast and $VNUS^{\circledR}Colosure$ plus are effective methods of endovenous saphenous ablation. $VNUS^{\circledR}Colosure$ fast is superior to the previous model with less treatment time preserving compatible efficacy and complications. The efficacy of $VNUS^{\circledR}Colosure$ fast for long term closure rate remains to be established.