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Semi-blind Source Separation via Sparse Representations and Online Dictionary Learning
Sirisha Rambhatla,Jarvis D. Haupt
Computer Science , 2012, DOI: 10.1109/ACSSC.2013.6810587
Abstract: This work examines a semi-blind single-channel source separation problem. Our specific aim is to separate one source whose local structure is approximately known, from another a priori unspecified background source, given only a single linear combination of the two sources. We propose a separation technique based on local sparse approximations along the lines of recent efforts in sparse representations and dictionary learning. A key feature of our procedure is the online learning of dictionaries (using only the data itself) to sparsely model the background source, which facilitates its separation from the partially-known source. Our approach is applicable to source separation problems in various application domains; here, we demonstrate the performance of our proposed approach via simulation on a stylized audio source separation task.
Controlling SO2 by Using Low Cost Adsorbents
Nenavath Gandhi,V. Mary Priyanka,D. Sirisha
Environmental Research, Engineering and Management , 2013, DOI: 10.5755/j01.erem.62.4.1947
Abstract: Sulphur oxides are formed during high temperature combustion processes from the oxidation of sulphur in the air. The principal source of sulphur oxides is sulphur oxide (SO) and sulphur dioxide (SO2), collectively known as SOx. SO and SO2 concentrations are therefore the highest in industrial area. Other important sources are power stations, heating plants, and industrial processes. Long-term exposure to sulphur dioxide may affect lung function, and that exposure to sulphur dioxide enhances the response to allergens in sensitized individuals. The feasibility of using waste materials as adsorbent for air pollutant SOx was evaluated in the present study. The experiments were carried out in laboratory on certain waste materials like Neem leaf powder, orange peel powder, custard apple leaf powder, Horse gram seed powder, Ragi seed powder, mango bark dust, mixed algae, and Neem bark dust. The experimental investigations were carried out by traditional adsorption studies, and they showed that all substances had certain capacity to adsorb SOx from aqueous solution of SOx. The order of adsorption by different low cost materials is Mango bark dust > Orange peel powder >Custard apple leaf powder> Neem leaf powder> Horse gram seed powder> Ragi seed powder> Neem bark powder, mixed algae by 98%>95%>88%>82%>80%>78%>77%>74%, respectively. At lower concentration the adsorption is more compared to higher concentration. It is found that the adsorption increases with an increase in surface area. DOI: http://dx.doi.org/10.5755/j01.erem.62.4.1947
Seasonal changes of biochemical composition of green algae Ulva fasciata Delile, 1813 and Caulerpa racemosa Agardh, 1873 from coastal waters of Visakhapatnam, east coast of India
Naga Krishna Veni D.,Rukmini Sirisha I.,Sudha Rani D.
- , 2015,
Abstract: Biochemical constituents such as protein, carbohydrate, lipid and ash in the dry tissue of green algae Ulva fasciata and Caulerpa racemosa have been reported from coastal waters of Visakhapatnam during February, 2006 - January, 2008. The mean values of protein, carbohydrate, lipid and ash in U. fasciata were 25.15%, 60.28%, 9.15% and 5.41% respectively. The mean values of protein, carbohydrate, lipid and ash in C. racemosa were 26.52%, 53.02%, 10.88% and 9.58% respectively. The percentage composition of protein, lipid, carbohydrate and ash contents showed variations in their abundance in different seasons. Seasonally highest protein content (27.09%) was noticed in summer, carbohydrate (65.19%) in monsoon, lipid (12.12%) in post-monsoon and ash (12.53%) in summer in U. fasciata. The highest protein content (30.88%) was noticed in post-monsoon, carbohydrate (55.78%) in monsoon, lipid (12.91%) in monsoon and ash (15.34%) in summer in C. racemosa. The protein content in two seaweed species studied were almost similar, but carbohydrate content noticed in U. fasciata little higher than that of carbohydrate content in C. racemosa. Tsunami (2004) did not affect the biochemical constituents of U. fasciata and C. racemosa distributed along the coastal waters of Visakhapatnam
Germination, Seedling Growth and Biochemical Responses of Amaranthus (Amaranthus tricolour L.) and Sesame (Sesamum indicum L.) at Varying Chromium Concentrations
D. Sirisha,I. Prudhvi Raj,M. Maheshwar,N. G,hi
- , 2017, DOI: 10.9734/IJPSS/2017/38228
Abstract:
KNOW MORE ABOUT PROPITIOUS SEED-FLAX
Sirisha M*
International Journal of Pharmacy and Technology , 2010,
Abstract: Linseed, linum usitatissimum is used in Ayuveda for many Vata, Pitta related disorders. The lipid content of the seed contains more than 55% of omega – 3 fatty acid responsible for hypolipidaemic,anticancer, anti inflammatory, anti burn, anti rheumatic, antithrombic and proven useful in atherosclerosis, arrhythmias, cardiac disorders, also in autoimmune diseases. Lignan content contains cyanogenic glucosides and phyto oestrogens. The whole seed is very useful and is known from the ancient times for its activities.Recent years, again people has realized about the valuable therapeutic activities and immense research work already been started. The use of seed is recommended for its omega-3, omega-6 and omega-9, phytoestrogens and cyanogenic glucosides. All these ingredients with diverse pharmacotherapeutic activities make it a propitious seed.
McAfee SecurityCenter Evaluation under DDoS Attack Traffic  [PDF]
Sirisha Surisetty, Student Member, Sanjeev Kumar
Journal of Information Security (JIS) , 2011, DOI: 10.4236/jis.2011.23011
Abstract: During the Distributed Denial of Service (DDoS) attacks, computers are made to attack other computers. Newer Firewalls now days are providing prevention against such attack traffics. McAfee SecurityCenter Firewall is one of the most popular security software installed on millions of Internet connected computers worldwide. “McAfee claims that if you have installed McAfee SecurityCentre with anti-virus and antispyware and Firewall then you always have the most current security to combat the ever-evolving threats on the Internet for the duration of the subscription”. In this paper, we present our findings regarding the effectiveness of McAfee SecurityCentre software against some of the popular Distributed Denial Of Service (DDoS) attacks, namely ARP Flood, Ping-flood, ICMP Land, TCP-SYN Flood and UDP Flood attacks on the computer which has McAfee SecurityCentre installed. The McAfee SecurityCentre software has an in built firewall which can be activated to control and filter the Inbound/Outbound traffic. It can also block the Ping Requests in order to stop or subside the Ping based DDoS Attacks. To test the McAfee Security Centre software, we created the corresponding attack traffic in a controlled lab environment. It was found that the McAfee Firewall software itself was incurring DoS (Denial of Service) by completely exhausting the available memory resources of the host computer during its operation to stop the external DDoS Attacks.
Success of banking ombudsmen scheme: Myth or reality
Malyadri, Pacha,Sirisha, S.
International Journal of Research Studies in Management , 2012,
Abstract: In the present banking system, excellence in customer service is the most important tool for sustained business growth. Customer complaints are part of the business life of any corporate entity. This is more so for banks because they are service organizations. Over a period of time, the number of complaints against banks with regard to deficiency of their services has been increasing in spite of several efforts taken by the banks on the advice of the Reserve Bank of India. Since the role of banks has changed from ‘Class Bank’ to ‘Mass Bank’, there is a tremendous pressure on the part of banks to satisfy the various needs of the customers. The load of work is increasing day by day on banks taking into account The Banking Ombudsman (BO) Scheme was established by the Reserve Bank of India (RBI) in 1995 to provide speedy solutions to grievances faced by bank customers. Although the number of complaints received through this forum has increased in recent times, the lack of awareness among the customers was a big concern. Through some proactive measures taken by the RBI and awareness campaigns conducted by the Ombudsman, the scenario looks much brighter today. Even then, a lot needs to be done to make the Scheme function more effectively. Against this backdrop, an attempt has been made to analyze the performance of Banking Ombudsman Scheme. Hence, the purpose of the present paper is to analyses the performance of the Banking Ombudsmen.
Efficient Synthesis of Dispiropyrrolidines Linked to Sugars
Sirisha Nallamala,Raghavachary Raghunathan
International Journal of Carbohydrate Chemistry , 2013, DOI: 10.1155/2013/340546
Abstract: An expedient method for the synthesis of glyco-dispiropyrrolidines is reported through 1,3-dipolar cycloaddition reaction (1,3 DC reaction). The novel glycosyl dipolarophiles derived from D-glucose underwent neat [3+2] cycloaddition reaction with the azomethine ylides generated from 1,2-diketones and sarcosine to give the corresponding glycosidic heterocycles in good yields. 1. Introduction Carbohydrates and their derivatives which are potential useful substrates in chemical and biological fields [1, 2] are present in natural products [3, 4]. Recent studies on these glycomolecules [5, 6], such as proteoglycans, glycoproteins [7, 8], glycolipids [9, 10], and antibiotics, have shed light on the significance of carbohydrate parts (glycons) in molecular recognition for the transmission of biological information [11, 12]. Therefore, it is now recognized that carbohydrates are at the heart of a multitude of biological events. With this stimulating biological background, efficient synthesis of not only carbohydrates themselves but also carbohydrate-containing heterocycles is becoming more and more important in the field of organic chemistry and chemical biology [13]. Hence there has been renewed interest in the synthesis of carbohydrate-based heterocycles. Heterocyclic compounds, particularly five and six membered ring compounds, have occupied a prominent place among the organic compounds in view of their diverse biological activities [14–18]. The spiropyrrolidine ring systems [19, 20] have acquired a prominent place among various heterocyclic compounds owing to their presence in many pharmacologically relevant alkaloids, as typified by rhyncophylline, corynoxeine, mitraphylline, horsifiline, and spirotryprostatins [21–23]. Synthesis and bioactivities of some of the spiropyrrolidines were reported by us recently [24]. Multicomponent intermolecular 1,3-dipolar cycloaddition reaction is an efficient method for the construction of heterocyclic units in a highly region- and stereoselective manner [25, 26]. In particular, the chemistry of azomethine ylides has gained significance in recent years as it serves as an expedient route for the construction of nitrogen-containing five membered heterocycles [27, 28]. This method is widely used for the synthesis of natural products such as alkaloids and pharmaceuticals [29, 30]. Continuing our interest in the area of 1,3-dipolar cycloaddition reaction [31, 32] and prompted by reports on the structural features and biological activity of carbohydrates and spiropyrrolidines, we contemplated fusing structurally unique
Regioselective Synthesis of Dispiro Pyrrolizidines as Potent Antimicrobial Agents for Human Pathogens
N. Sirisha,R. Raghunathan
ISRN Medicinal Chemistry , 2013, DOI: 10.1155/2013/492604
Abstract: Synthesis of a series of novel dispiro pyrrolizidines has been accomplished by 1,3-dipolar cycloaddition reaction of azomethine ylide generated from secondary amino acids and diketones with bischalcones. These compounds were evaluated for their antibacterial activity. Most of the synthetic compounds exhibited good antibacterial activity against microorganisms. 1. Introduction 1,3-dipolar cycloaddition is one of the important tools for the construction of five membered heterocycles [1], and many important natural products have been synthesized by this method [2, 3]. Pyrrolidine-based natural products are very useful in preventing and treating rheumatoid arthritis, asthma, and allergies and also possess anti-influenza virus and anticonvulsant activities [4]. The azomethine ylide represents one of the most reactive and versatile classes of 1,3-dipoles and is readily trapped by a range of dipolarophiles forming substituted pyrrolidines [5]. Spiro compounds represent an important class of naturally occurring substances characterized by highly pronounced biological properties [6, 7]. Chalcones belong to the broad class of compounds present in almost all vascular plants, not only in their terrestrial parts but also in roots, as well as in flakes and seeds. Chalcones are precursors of flavonoids and play a crucial role in their biosynthesis [8, 9]. Depending on the substitution pattern on the two aromatic rings, a wide range of pharmacological activities has been identified for various chalcones [10, 11]. These include among others cytotoxic, antiprotozoal [12], antibacterial, antifungal [13], and antitumor activities [14, 15]. More recently, there has been strong interest in the antimalarial activity of chalcones and bischalcones [16]. As a part of the ongoing research program on the synthesis of complex novel spiro heterocycles [17], herein we report for the first time an expeditious protocol for the synthesis of novel dispiro pyrrolizidines through 1,3-dipolar cycloaddition reaction of azomethine ylide generated from various diketones and secondary amino acids with bischalcones derived from terephthalaldehyde and substituted acetophenones as dipolarophiles. The synthesized compounds were screened for antimicrobial activity, and the results are presented in this paper. 2. Materials and Methods 2.1. General Procedure for the Synthesis of Bischalcones 3a–c A solution of substituted acetophenone (2 equiv) and terephthalaldehyde (1 equiv) in methanolic solution of NaOH (60%) was stirred for 20？h at room temperature. The solution was poured into ice-cold water at
COMPOUND RAYLEIGH LIFETIME DISTRIBUTION-I
G Sirisha,Jayasree G.
- , 2018,
Abstract:
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