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RISS 인기검색어
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- 저자 : Ramesh, R. (검색결과 780 건)
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Fixed point theorems for weak contraction in Intuitionistic fuzzy metric space
Ramesh Kumar Vats,Ramesh Kumar Vats 호남수학회 2016 호남수학학술지 Vol.38 No.2
The notion of weak contraction in intuitionistic fuzzy metric space is well known and its study is well entrenched in the literature. This paper introduces the notion of $(\psi,\alpha,\beta)$-weak contraction in intuitionistic fuzzy metric space. In this contrast, we prove certain coincidence point results in partially ordered intuitionistic fuzzy metric spaces for functions which satisfy a certain inequality involving three control functions. In the course of investigation, we found that by imposing some additional conditions on the mappings, coincidence point turns out to be a fixed point. Moreover, we establish a theorem as an application of our results.
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Reduction of Blocking Artifact using Edge Information
Ramesh Kumar Lama,Il-Chul Park,Jae-Young Pyun,Goo-Rak Kwon 대한전자공학회 2010 ICEIC:International Conference on Electronics, Inf Vol.1 No.1
A new method of reducing the blocking artifact in low bit rate coded image is presented in this paper. The proposed algorithm operates being based on the edge pixel residing across the block. The strength of deblocking filter is determined according the number of edge pixel in corresponding block. Proposed algorithm removes the blocking artifact in coded image with good subjective and objective result.
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An Adaptive Interpolation Algorithm using Two Separate Modes
Ramesh Kumar Lama,Goo-Rak Kwon 한국멀티미디어학회 2010 한국멀티미디어학회 국제학술대회 Vol.2010 No.-
This paper presents an adaptive interpolation algorithm for an image resizing based on two separate modes in terms of activity of pixel in an image. First mode corresponds to smooth region and interpolation operation is performed by the conventional nearest neighbor method because this method is more computationally efficient and gives good quality result for pixels having neighboring pixels with pixel intensity in close proximity to each other. Second mode corresponds to complex region. The target pixel is computed based on Newton interpolation method. To preserve the edge details and to reduce the aliasing effect in scaled image, consecutive pixels are separated into two groups. Group with highly relative pixels is selected for effective interpolation. The simulation results show that the proposed algorithm outperforms the conventional methods even though the computational complexity is low.
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Ramesh, T.,Kim, S.W.,Sung, J.H.,Hwang, S.Y.,Sohn, S.H.,Yoo, S.K.,Kim, S.K. Pergamon Press ; Elsevier Science Ltd 2012 Experimental Gerontology Vol.47 No.1
The intracellular levels of oxidant and antioxidant balances are gradually distorted during the aging process. An age associated elevation of oxidative stress occurring throughout the lifetime is hypothesized to be the major cause of aging. The present study was undertaken to evaluate the putative antioxidant activity of the fermented Panax ginseng extract (GINST) on lipid peroxidation and antioxidant status of major organs of aged rats compared to young rats. Increased levels of aspartate aminotransferase (AST), alanine aminotransferase (ALT), urea and creatinine were observed in the serum of aged rats. Increased levels of malondialdehyde (MDA) and significantly lowered activities of superoxide dismutase (SOD), catalase (CAT), glutathione peroxidase (GPx), glutathione reductase (GR) and glutathione-S-transferase (GST) were observed in the liver, kidneys, heart and lungs of aged rats, when compared with those in young rats. Quantitative analysis of the non-enzymatic antioxidants such as reduced glutathione (GSH), ascorbic acid and α-tocopherol levels showed significantly lower values in the liver, kidneys, heart and lungs of aged rats. On the other hand, administration of the fermented Panax ginseng extract (GINST) to aged rats resulted in increased activities of SOD, CAT, GPx, GR and GST as well as elevation in GSH, ascorbic acid and α-tocopherol levels. Besides, the level of MDA, AST, ALT, urea and creatinine were reduced on administration of GINST to aged rats. These results suggested that treatment of GINST can improve the antioxidant status during aging, thereby minimizing the oxidative stress and occurrence of age-related disorders associated with free radicals.
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Ramesh, T.,Yoo, S.K.,Kim, S.W.,Hwang, S.Y.,Sohn, S.H.,Kim, I.W.,Kim, S.K. Pergamon Press ; Elsevier Science Ltd 2012 Experimental Gerontology Vol.47 No.12
Free radical-induced oxidative damage is considered to be the most important consequence of the aging process. The activities and capacities of antioxidant systems of cells decline with increased age, leading to the gradual loss of pro-oxidant/antioxidant balance and resulting in increased oxidative stress. Our investigation was focused on the effects of cordycepin (3'-deoxyadenosine) on lipid peroxidation and antioxidation in aged rats. Age-associated decline in the activities of superoxide dismutase (SOD), catalase (CAT), glutathione peroxidase (GPx), glutathione reductase (GR), glutathione-S-transferase (GST), reduced glutathione (GSH), vitamin C and vitamin E, and elevated levels of malondialdehyde (MDA) were observed in the liver, kidneys, heart and lungs of aged rats, when compared to young rats. Furthermore, serum aspartate aminotransferase (AST), alanine aminotransferase (ALT), urea, and creatinine were found to be significantly elevated in aged rats compared to young rats. Aged rats receiving cordycepin treatment show increased activity of SOD, CAT, GPx, GR and GST, and elevated levels of GSH, and vitamins C and E such that the values of most of these parameters did not differ significantly from those found in young rats. In addition, the levels of MDA, AST, ALT, urea and creatinine became reduced upon administration of cordycepin to aged rats. These results suggest that cordycepin is effective for restoring antioxidant status and decreasing lipid peroxidation in aged rats.
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Ramesh Dod,Goutam Banerjee,S. Saini 한국생물공학회 2012 Biotechnology and Bioprocess Engineering Vol.17 No.4
Methylene blue (MB), a common toxic dye, is largely discharged from dyeing processes for acrylic,nylon, silk, and woolen fabrics in textile industries. While application of conventional removal processes like chemical precipitation, ion exchange, commercial activated carbon adsorption, etc often become cost-prohibitive, the adsorption of MB by abundantly available green pea peel (GPP: Pisum sativum) derived and acid-treated carbon (GPP-AC) has proved to be a cost-attractive option in the present study. The physicochemical and morphological characteristics of GPP-AC were examined with the help of XRD, BET surface area, SEM, and Fourier transform infrared spectrophotometry ((FT-IR) analysis. The influences of such adsorption parameters as initial dye concentration, pH, contact time,adsorbent dosage, agitation speed, particle size, and temperature were evaluated and optimized. The equilibrium contact time for maximum adsorption of MB on to GPPAC was found to be 7 h. The equilibrium data of the adsorption process were modeled by using the Langmuir,Freundlich, Temkin, and Dubinin-Raduskevich (D-R)isotherms. However, the adsorption equilibrium data were best described by the Langmuir Isotherm model, with a maximum adsorption capacity of 163.94 mg MB/g GPPAC at 30℃. Methylene blue (MB), a common toxic dye, is largely discharged from dyeing processes for acrylic,nylon, silk, and woolen fabrics in textile industries. While application of conventional removal processes like chemical precipitation, ion exchange, commercial activated carbon adsorption, etc often become cost-prohibitive, the adsorption of MB by abundantly available green pea peel (GPP: Pisum sativum) derived and acid-treated carbon (GPP-AC) has proved to be a cost-attractive option in the present study. The physicochemical and morphological characteristics of GPP-AC were examined with the help of XRD, BET surface area, SEM, and Fourier transform infrared spectrophotometry ((FT-IR) analysis. The influences of such adsorption parameters as initial dye concentration, pH, contact time,adsorbent dosage, agitation speed, particle size, and temperature were evaluated and optimized. The equilibrium contact time for maximum adsorption of MB on to GPPAC was found to be 7 h. The equilibrium data of the adsorption process were modeled by using the Langmuir,Freundlich, Temkin, and Dubinin-Raduskevich (D-R)isotherms. However, the adsorption equilibrium data were best described by the Langmuir Isotherm model, with a maximum adsorption capacity of 163.94 mg MB/g GPPAC at 30℃.
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( Ramesh T ),이재욱,심왕근,문희 한국화학공학회 2007 화학공학의이론과응용 Vol.10 No.2
The use of low- pressure-driven membranes with powdered activated carbon (PAC) is gaining greater importance for the wastewater reuse. Submerged hollow fiber membrane allows PACs to be added directly into the tank containing the immersed membrane. However, this study highlights the importance of the method of application of PAC, which determines the organic removability and the permeate flux pattern by the hybrid system. Three different scenarios, namely, PAC addition in the tank, PAC in the presence of calcium chloride and a novel method of PAC coating as a secondary membrane, were evaluated. The results indicated that, when PAC was used along with CaCl2, the amount of PAC requirement could be reduced up to 70 %, depending on the type of PAC used. However, the PAC coated membrane proved to be far more superior to adding PAC in the tank, in terms of organic removal efficiency and preventing membrane fouling. This study is significant in order to understand and carefully select the method of using PAC for membrane hybrid system, so that PAC dose can be minimized and achieve enhanced performance.
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