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Can the Southern Annular Mode Influence the Korean Summer Monsoon Rainfall?
Amita Prabhu,Ramesh Kripalani,오재호,Bhaskar Preethi 한국기상학회 2017 Asia-Pacific Journal of Atmospheric Sciences Vol.53 No.2
We demonstrate that a large-scale longitudinally symmetric global phenomenon in the Southern Hemisphere sub-polar region can transmit its influence over a remote local region of the Northern Hemisphere traveling more than 100o of latitudes (from ~70oS to ~40oN). This is illustrated by examining the relationship between the Southern Annular Mode (SAM) and the Korean Monsoon Rainfall (KMR) based on the data period 1983-2013. Results reveal that the May-June SAM (MJSAM) has a significant in-phase relationship with the subsequent KMR. A positive MJSAM is favorable for the summer monsoon rainfall over the Korean peninsula. The impact is relayed through the central Pacific Ocean. When a negative phase of MJSAM occurs, it gives rise to an anomalous meridional circulation in a longitudinally locked air-sea coupled system over the central Pacific that propagates from subpolar to equatorial latitudes and is associated with the central Pacific warming. The ascending motion over the central Pacific descends over the Korean peninsula during peak-boreal summer resulting in weakening of monsoon rainfall. The opposite features prevail during a positive phase of SAM. Thus, the extreme modes of MJSAM could possibly serve as a predictor for ensuing Korean summer monsoon rainfall.
Amita Shinde,Amol Rahulkar,Chetankumar Patil 대한의용생체공학회 2019 Biomedical Engineering Letters (BMEL) Vol.9 No.3
This paper presents a new class of local neighborhood based wavelet feature descriptor (LNWFD) for content based medicalimage retrieval (CBMIR). To retrieve images eff ectively from large medical databases is backbone of diagnosis. Existingwavelet transform based medical image retrieval methods suff er from high length feature vector with confi ned retrieval performance. Triplet half-band fi lter bank (THFB) enhanced the properties of wavelet fi lters using three kernels. The infl uenceof THFB has employed in the proposed method. First, triplet half-band fi lter bank (THFB) is used for single level waveletdecomposition to obtain four sub-bands. Next, the relationship among wavelet coeffi cients is exploited at each sub-bandusing 3 × 3 neighborhood window to form LNWFD pattern. The novelty of the proposed descriptor lies in exploring relationbetween wavelet transform values of pixels rather than intensity values which gives more detail local information in waveletsub-bands. Thus, proposed feature descriptor is robust against illumination. Manhattan distance is used to compute similaritybetween query feature vector and feature vector of database. The proposed method is tested for medical image retrieval usingOASIS-MRI, NEMA-CT, and Emphysema-CT databases. The average retrieval precisions achieved are 71.45%, 99.51% ofOASIS-MRI and NEMA-CT databases for top ten matches considered respectively and 55.51% of Emphysema-CT databasefor top 50 matches. The superiority in terms of performance of the proposed method is confi rmed by the experimental resultsover the well-known existing descriptors.
An Enhanced Distributed Energy-Efficient Clustering (DEEC) Protocol for Wireless Sensor Networks
Amita Yadav,Suresh Kumar 보안공학연구지원센터 2016 International Journal of Future Generation Communi Vol.9 No.11
Wireless Sensor Networks (WSNs) is a warm area of research. WSNs consist of large number of sensor nodes deployed randomly in the sensor field. But, it suffers with several shortcomings such as energy imbalance, processing power, storage, transmission range and mitigates energy hole problems. Therefore it’s a tough task to design and develop an optimized routing protocol for WSNs. Hence, this research paper mainly focuses on the energy consumption and network lifespan issues of WSNs and presents an improved version of Distributed Energy-Efficient Clustering (DEEC) protocol. To enhance the network lifetime and reliability of DEEC protocol, three improvements are incorporated in the algorithm and the proposed algorithm named as improved DEEC (IDEEC). From experiment section, it is stated that proposed improvements make protocol more robust and efficient in terms of lifetime of nodes, stability and energy consumption in comparison to other algorithm being compared.
Amita Sarwal,Gurpreet Singh,Shilpa Singh,Kirti Singh,V. R. Sinha 한국약제학회 2019 Journal of Pharmaceutical Investigation Vol.49 No.1
The main objective of the present work was to develop and evaluate a mucoadhesive in-situ based gel for the vaginal delivery of Fluconazole (FLZ). The formulation was developed using the cold method and evaluated for various physicodynamic and aesthetic properties. The gelling agents used were evaluated for their potential to gel FLZ without affecting its structure. The bioadhesive potential and antifungal activity of the FLZ in-situ gel was determined in comparison to the marketed antifungal topical cream, FLUCOS ®. The drug content varied from 95.3 to 98.01% and pH values were found to be slightly acidic (4.2–4.5), as normal for the vaginal milieu. The FLZ in-situ gel showed significantly higher in-vitro bioadhesion of 0.277 and antifungal activity as compared to the marketed formulation with a bioadhesion of 0.281, and did not show any signs of vaginal irritation. Thus, it can be concluded that the developed intravaginal in-situ gel formulation can be used for effective targeted treatment of vulvovaginal candidiasis (VVC) in comparison to FLUCOS ® with better mucoadhesion, drug release, permeability and drug retention characteristics with more acceptable patient compliance.
Bhatia, Amita,Gupta, Rahul K.,Bhattacharya, Sati. N.,Choi, H.J. The Korean Society of Rheology 2007 Korea-Australia rheology journal Vol.19 No.3
Biodegradable polymeric blends are expected to be widely used by industry due to their environmental friendliness and comparable mechanical and thermal properties. Poly (lactic acid) (PLA) and poly (butylene succinate) (PBS) are such biodegradable polymers which aim to replace commodity polymers in future applications. Since cost and brittleness of PLA is quite high, it is not economically feasible to use it alone for day to day use as a packaging material without blending. In this study, blends of PLA and PBS with various compositions were prepared by using a laboratory-scale twin-screw extruder at $180^{\circ}C$. Morphological, thermal, rheological and mechanical properties were investigated on the samples obtained by compression molding to explore suitability of these compositions for packaging applications. Morphology of the blends was investigated by scanning electron microscopy (SEM). Morphology showed a clear phase difference trend depending on blend composition. Modulated differential scanning calorimetry (MDSC) thermograms of the blends indicated that the glass transition temperature ($T_g$) of PLA did not change much with the addition of PBS, but analysis showed that for PLA/PBS blend of up to 80/20 composition there is partial miscibility between the two polymers. The tensile strength and modulus were measured by the Instron Universal Testing Machine. Tensile strength, modulus and percentage (%) elongation at break of the blends decreased with PBS content. However, tensile strength and modulus values of PLA/PBS blend for up to 80/20 composition nearly follow the mixing rule. Rheological results also show miscibility between the two polymers for PBS composition less than 20% by weight. PBS reduced the brittleness of PLA, thus making it a contender to replace plastics for packaging applications. This work found a partial miscibility between PBS and PLA by investigating thermal, mechanical and morphological properties.