A Comparative Analysis of Impulse Noise Removal Techniques on Gray Scale Images

V. Murugan,T. Avudaiappan,Dr. R. Balasubramanian 보안공학연구지원센터 2014 International Journal of Signal Processing, Image Vol.7 No.5

Various kinds of images and pictures are required as sources of information for analysis and interpretation. When an image is converted from one form to another such as scanning, transmitting, digitizing, storing etc., degradation occurs to the output image. Hence, the output image needs to be enhanced in order to be better analyzed. Denoising is the one of the pre processing technique in digital image processing. This paper investigates the performance of four denoising methods for removing the High Density Impulse Noise. They are Adaptive Bilateral Filter (ABF), Fuzzy Peer Group Filter (FPGF), Switching Bilateral Filter (SBF), and Boundary Discriminative Noise Detection Filter (BDND).The performance of the above four filters is compared by using five performance metrics. They are Peak-Signal-to-Noise-Ratio, Mean Square Error and Root Mean Square Error. The Experimental results show that the BDND filter based denoising method performs well than the other three methods.

Experimental analysis of treated waste foundry and waste ceramics sand by replacement of fine aggregate in concrete

K.V. Boobala Krishnan,K. Nirmalkumar,V. Sampathkumar,P.C. Murugan 한양대학교 청정에너지연구소 2023 Journal of Ceramic Processing Research Vol.24 No.4

Due to rapid urbanization and industrialization, excessive exploitation of natural resources like river sand and gravels is amajor concern. This study investigated the use of waste foundry sand and waste ceramics as partial replacements for M-sandin concrete. M25 grade concrete with a 1:1.1:2.2 ratio and a water-to-cement ratio of 0.45 was used. Waste foundry sandunderwent pre-treatment with sodium silicate to improve its applicability. Treated waste foundry sand (TWFCS) and 10%powdered waste ceramics were combined to partially replace M-sand in different proportions (0%, 10%, 15%, and 20%). Mechanical tests, including compressive, tensile, and flexural strength assessments, were conducted after 7, 14, and 28 daysof curing. The concrete samples were exposed to a marine and acidic environment for 60 days. TWFCS 3 exhibited the lowestcompressive strength (26.39 N/mm2) after exposure to an alkaline environment, while TWFCS 1 showed the highestcompressive strength (28.63 N/mm2). Treated foundry sand showed superior mechanical properties, surpassing M-sand by15% in terms of compressive, split tensile, and flexural strength. SEM and XRD analysis were used to evaluate the concretecontaining treated waste foundry and ceramics sand.

Establishment of Structural Similitude for Elastic Models and Validation of Scaling Laws

Murugan Ramu,V. Prabhu Raja,P. R. Thyla 대한토목학회 2013 KSCE JOURNAL OF CIVIL ENGINEERING Vol.17 No.1

Scaled down models are widely used for experimental investigations on huge structures due to the limitation in the capacities of testing facilities, and, moreover, the experimentation on scaled models is less expensive. Also small scale models are often built with materials dissimilar to those of the prototype. However, only few studies have been carried out on the similitude laws for the prototype structures with small scale models built with a different material. In the present study, an attempt has been made to develop a scaling law for models to carry out the free vibration analysis of structures, based on the similitude requirement. The established scaling laws are validated analytically using simple test problems. The similitude relationship between the prototype and the model is validated with the aid of a case study using finite element analysis software.

Some congruence properties for -regular partitions, where l ∈ {4, 8, 13, 17, 19, 25, 40, 55}

P. Murugan,V. S. Veena,S. N. Fathima 장전수학회 2023 Proceedings of the Jangjeon mathematical society Vol.26 No.2

Some congruence properties for -regular partitions, where l ∈ {4, 8, 13, 17, 19, 25, 40, 55}

Infusing the axioms of clinical reasoning while designing clinical anatomy case vignettes teaching for novice medical students: a randomised cross over study

Dinesh Kumar,V,Rajprasath R,N,A,Priyadharshini,Magi Murugan,Rema Devi 대한해부학회 2020 Anatomy & Cell Biology Vol.53 No.2

The clinical reasoning skills is often gained when the biomedical knowledge is broadened and deepened alongside exposure to patients. The ‘ideal’ blend of axioms of clinical reasoning and case based learning would establish the pedagogical bridges right from the first year of medical education. So this study aimed to investigate the perceived importance and efficacy of teaching clinical reasoning skills among first year medical students, as this has not previously been described. As a priori, two clinical reasoning skill sessions were conducted using clinico-anatomical case vignettes designed according to the literature regarding clinical reasoning (‘serial cue’ approach and hypothetico-deduction). Students were divided into intervention and control group and crossed over in subsequent sessions. Analysis was done by mixed method approach including measuring proof of benefit using post-test comparison, quantitative survey and qualitative analysis by nominal group discussion. Post test scores were compared using student’s t-test. Feedbacks were analysed using descriptive statistics. The results showed that post test scores were significantly higher in intervention group than the control group in both sessions (P<0.001, 0.016). A total of 66% students felt, diagnostic skills and lateral thinking abilities were improved and It helped in developing problem-solving abilities for 67% students. clinico-anatomical case vignettes helped in understanding anatomical basis of clinical conditions for 61% students. To conclude, introducing clinical reasoning has considerable effect in improving the decision making ability of the students and if incorporated right from the first year, would better prepare the students in successful transition to clinical learning environment.

EXPERIMENTAL VALIDATION OF A MATHEMATICAL MODEL OF A REED-VALVE RECIPROCATING AIR COMPRESSOR FROM AN AUTOMOTIVE-BRAKING SYSTEM

J. VENKATESAN,G. NAGARAJAN,R. V. SEENIRAJ,R. MURUGAN 한국자동차공학회 2010 International journal of automotive technology Vol.11 No.3

Mathematical simulation is the process of designing a model of a real system and then conducting experiments with the simulation to understand the system’s behavior. Mathematical simulation is widely used for investigating and designing compressors, and with a minimal number of simplifying assumptions, mathematical models can be used in conjunction with modern computing tools to solve complicated problems. A considerable amount of previous research has focused on the mathematical modeling of reciprocating air compressors used in automotive braking. The aim of the present work was to experimentally validate the mathematical model for such compressors. We present a simplified and effective mathematical model for estimating compressor performance, and this model can easily be executed using personal computers. Parameters such as compressor speed, discharge pressure and clearance volume were evaluated in terms of their effect on the thermodynamic behavior of compressors. The model can predict cylinder pressure, cylinder volume, cylinder temperature, valve lift and resultant torque at different crank angles; it can also predict the free air delivered and the indicated power of the compressor. Therefore, the model has been validated using experimental results.

Conceptual Aerodynamic Design of Pintle Nozzle for Variable-Thrust Propulsion

Vignesh Saravanan,고정우,이수갑,Nijanthan Murugan,V. R. Sanal Kumar 한국항공우주학회 2020 International Journal of Aeronautical and Space Sc Vol.21 No.1

Comprehensive theoretical studies have been carried out for the geometry optimization of a pintle nozzle for variable-thrust propulsion. We designed the pintle such that, at the final pintle position, the integrated shape facilitates the scaled-down version of the shockless main nozzle. Numerical studies have been carried out using a validated two-dimensional transient, an implicit Reynolds-averaged Navier–Stokes equations (RANS) solver with a k–ω Menter’s shear stress transport (SST) turbulence model. At the quasi-steady and dynamic conditions, the numerical results have shown excellent agreement with the theoretical results. In the dynamic condition, the effects of shock train, shock impinging, and the shock location on the overall thrust are studied, and we observed a monotonic increase in thrust during the pintle movement toward the exit and achieved the maximum thrust at the highest area ratio (nozzle exit area to throat area) position. The diminishing of the shock–strength pattern and the movement of the shock-impinging point towards the nozzle exit are captured in the numerical simulation and reported herein. We concluded that the prudent aerodynamic shape optimization of the external surface contour of the pintle and the inner surface contour of its associated nozzle ensures improved performance for the variable-thrust propulsion of aerospace vehicles.