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Sameera, G,Vishnu, Vardhan R The Korean Statistical Society 2019 Communications for statistical applications and me Vol.26 No.2
Classification models pertaining to receiver operating characteristic (ROC) curve analysis have been extended from univariate to multivariate setup by linearly combining available multiple markers. One such classification model is the multivariate ROC curve analysis. However, not all markers contribute in a real scenario and may mask the contribution of other markers in classifying the individuals/objects. This paper addresses this issue by developing an algorithm that helps in identifying the important markers that are significant and true contributors. The proposed variable selection framework is supported by real datasets and a simulation study, it is shown to provide insight about the individual marker's significance in providing a classifier rule/linear combination with good extent of classification.
Deep transductive transfer learning framework for zero-day attack detection
Nerella Sameera,M. Shashi 한국통신학회 2020 ICT Express Vol.6 No.4
Zero-day attack detection in Intrusion Detection Systems is challenging due to the lack of labeled instances. This paper applies manifold alignment approach of TL that transforms the source and target domains into a common latent space to evade the problem of different feature spaces and different marginal probability distributions among the domains. On the transformed space, a method is proposed for generating target soft labels to compensate for the lack of labeled target instances by applying the cluster correspondence procedures. On top of this, DNN is applied to build a framework for the detection of zero-day attacks. Authors have conducted several experiments using NSL-KDD and CIDD datasets to evaluate the performance of the proposed framework. From the experimental results it is evident that the proposed framework could successfully detect zero-day attacks on unseen data.
K. A. Sameera Nuwan,Samiru Sudharaka Wickramasuriy,Dinesh D. Jayasena,R. M. Himali Tharangani,Zhang Song,Young-Joo Yi,Jung Min Heo 한국가금학회 2016 韓國家禽學會誌 Vol.43 No.3
An experiment was conducted to evaluate the growth performance and meat quality traits of broilers fed a diet supplemented with dry-ground curry leaves (Murraya koenigii). A total of 750 one-day-old broiler chicks (Cobbs 500) were arranged in the experiment with a completely randomized design and allotted to one of five treatments, with T1-Control and T2-T5 curry leaves powder levels (i.e., 0.3%, 0.6%, 0.9% and 1.2%, respectively). The initial body weights, final body weights and daily feed intake were measured over an experimental period of 32 days. At the conclusion of the experiment, the carcass weights and meat quality parameters were measured. The birds fed diets supplemented with curry leaves powder had a higher weight gain (P<0.05; ADG), improved feed conversion ratio (P<0.05; FCR) and lower mortality (P<0.05) rates compared to the birds in the control group. Nonetheless, there was no difference (P>0.05) in feed intake among the dietary treatments. Similarly, supplementation of curry leaves powder had no effect (P>0.05) on the proportions of the carcass, leg meat and drumstick. No differences were (P>0.05) observed in cooking loss or the pH of meat from broilers fed the curry leaves supplemented diet. However, curry leaf supplementation affected (P<0.05) the meat water holding capacity. A sensory evaluation showed higher levels of taste and tenderness in meat from broilers fed with curry leaves powder. In conclusion, our results suggested that curry leaves powder improved the growth performance of broilers, with a lower incidence of mortality and improvement of some meat qualities.
Nuwan, K.A. Sameera,Wickramasuriya, Samiru Sudharaka,Jayasena, Dinesh D.,Tharangani, R.M. Himali,Song, Zhang,Yi, Young-Joo,Heo, Jung Min The Korean Society of Poultry Science 2016 韓國家禽學會誌 Vol.43 No.3
An experiment was conducted to evaluate the growth performance and meat quality traits of broilers fed a diet supplemented with dry-ground curry leaves (Murraya koenigii). A total of 750 one-day-old broiler chicks (Cobbs 500) were arranged in the experiment with a completely randomized design and allotted to one of five treatments, with $T_1-Control$ and $T_2-T_5$ curry leaves powder levels (i.e., 0.3%, 0.6%, 0.9% and 1.2%, respectively). The initial body weights, final body weights and daily feed intake were measured over an experimental period of 32 days. At the conclusion of the experiment, the carcass weights and meat quality parameters were measured. The birds fed diets supplemented with curry leaves powder had a higher weight gain (P<0.05; ADG), improved feed conversion ratio (P<0.05; FCR) and lower mortality (P<0.05) rates compared to the birds in the control group. Nonetheless, there was no difference (P>0.05) in feed intake among the dietary treatments. Similarly, supplementation of curry leaves powder had no effect (P>0.05) on the proportions of the carcass, leg meat and drumstick. No differences were (P>0.05) observed in cooking loss or the pH of meat from broilers fed the curry leaves supplemented diet. However, curry leaf supplementation affected (P<0.05) the meat water holding capacity. A sensory evaluation showed higher levels of taste and tenderness in meat from broilers fed with curry leaves powder. In conclusion, our results suggested that curry leaves powder improved the growth performance of broilers, with a lower incidence of mortality and improvement of some meat qualities.
Masimbule Vidanalage Kasun Sameera Wickramanayake,Liyana Arachchilage Dinithi Sandunika De Silva,허강준 한국예방수의학회 2022 예방수의학회지 Vol.46 No.3
This study is intended to determine the antimicrobial resistance properties and class 1 integrons of 30 Citrobacter freundii strains isolated from pet turtles in order to determine their threat to human health. Citrobacter freundii isolates were isolated and identified by employing biochemical tests and 16SrRNA gene sequencing. Disc diffusion test and PCR amplification were employed to detect antimicrobial resistance patterns and genes, respectively. Ampicillin, amoxicillin, cephalothin and nalidixic acid resistance were observed among all isolates. Rifampicin and cefoxitin resistance was the second most prevalent and observed in 97% of the isolates, respectively. All isolates scored multiple antimicrobial resistance (MAR) indices ≥ 0.2. Aminoglycoside resistant genes were the most prevalent. aac(3')-IIa was detected in 80% of the isolates followed by aphAI-IAB and strA-strB genes in 33% and 50% of the isolates, respectively. β-lactamase encoding blaTEM, blaCTX and blaSHV genes were detected in 53%, 43% and 17% of the isolates, respectively. tetA and tetB genes were the only tetracycline resistance genes detected in 17% and 10% of the isolates, respectively. Class 1 integron integrase encoding intI1 gene (47%) and dfrA17-aadA5 gene cassette array (7%) were also detected. Pet turtle-borne multidrug-resistant C. freundii is a reservoir of antimicrobial resistance determinants in the domestic environment which poses a risk of infection.
Synthesis of Highly Crystalline Ga-doped Zinc-oxide Nanoparticles for Hybrid Polymer Solar Cells
박혜정,이강혁,Ivaturi Sameera,김상우 한국물리학회 2015 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.66 No.9
Gallium (Ga)-doped zinc-oxide (ZnO) nanoparticles (NPs) were synthesized by using a polymer pyrolysis method. The smallest size of the obtained 4-mol% Ga-doped zinc-oxide (GZO) spherical NPs was approximately 10-15 nm, and the presence of Ga was confirmed by using X-ray photoelectron spectroscopy. To examine the role of GZO NPs, fabricated hybrid polymer solar cells (HPSCs) by using blends of a conjugated polymer poly (3-hexalthiophene) as an electron donor and crystalline GZO NPs as an electron acceptor. Significant improvements in the short-circuit current density and fill factor compared to these for the undoped ZnO (UZO) NPs were achieved by using the GZO NPs. This suggests that the GZO NPs have higher electron mobility than the UZO NPs and possess great potential for use as electron acceptor in HPSCs.
Min Chang Oh,Pincha Devage Sameera Madushan Fernando,Mei Jing Piao,Kyoung Ah Kang,Herath Mudiyanselage Udari lakmini Herath,Jin Won Hyun 대한암예방학회 2023 Journal of cancer prevention Vol.28 No.2
Excessive UVB exposure causes development of both malignant and non-malignant melanoma via the secretion of α-melanocyte-stimulating hormone (α-MSH). We investigated whether baicalein (5,6,7-trihydroxyflavone) could inhibit α-MSH-stimulated melanogenesis. Baicalein prevented UVB- and α-MSH-induced melanin production and attenuated α-MSH-stimulated tyrosinase (monophenol monooxygenase) activity, and expression of tyrosinase and tyrosine-related protein-2. In addition, baicalein prevented melanogenesis and pigmentation via the p38 mitogen-activated protein kinases signaling pathway. These findings suggest that baicalein represents a natural compound for attenuating melanogenesis.
Extract of Seaweed Dictyota coriacea Scavenges Superoxide Anion and Hydroxyl Radical
MEIJING PIAO,Kyoung Ah Kang,Herath Mudiyanselage Udari Lakmini Herath,Pincha Devage Sameera Madushan Fernando,Nam Ho Lee,Jin Won Hyun 건강기능식품미래포럼 2023 건강기능식품미래포럼 학술지 Vol.3 No.2
In this study, we prepared the ethanol extract of Dictyota coriacea (DCEE) and investigated its ability, along with epiloliolide and 1,9-dihydroxycrenulide compounds derived from this seaweed, to eliminate superoxide anion (·O2 − ) and hydroxyl radical (·OH) through electron spin resonance spectrometry. The findings indicate that DCEE effectively scavenges both ·O2 − and ·OH, while the 2 compounds target ·OH only. These results support the ·OH scavenging properties of DCEE and imply the presence of substances within DCEE that can also eliminate ·O2 − . Furthermore, in order to identify ingredients with antioxidant properties and ensure their safety, we fractionated DCEE into 5 fractions using solvents of varying polarities (hexane, dichloromethane, ethyl acetate, butanol, and water) and examined these fractions for 1,1-diphenyl-2-picrylhydrazyl radical scavenging activity and cytotoxicity. Among the 5 fractions, the ethyl acetate fraction exhibited the highest activity, followed by the water and dichloromethane fractions, while the hexane and butanol fractions displayed the lowest activities. With regards to cytotoxicity, all fractions except for the water fraction exhibited varying degrees of cytotoxic effects, which correlated inversely with the polarity of the solvents used. The ethyl acetate and dichloromethane fractions demonstrated superior scavenging activity but also higher cytotoxicity, whereas the butanol fraction exhibited lower cytotoxicity but the least scavenging activity. These findings suggest that D. coriacea possesses the ability to eliminate ·O2 − and ·OH and propose that fractionating DCEE using water may yield antioxidant ingredients with minimal cytotoxicity