oalib

OALib Journal期刊

ISSN: 2333-9721

费用:99美元

投稿

匹配条件: “ Kusal Rathnayake” ,找到相关结果约30条。
列表显示的所有文章,均可免费获取
第1页/共30条
每页显示
Cointegration Based Regression to Analyse Linkage between Share Price Index and Macroeconomic Variables: Evidence from Colombo Stock Exchange  [PDF]
Gayani Thalagoda, Kusal Rathnayake, Sachith Abeysundara
Open Access Library Journal (OALib Journal) , 2018, DOI: 10.4236/oalib.1104955
Abstract:
The main objective of the study is to investigate the long run performance of the All Share Price Index (ASPI) of the Colombo Stock Exchange, based on the economic activities of Sri Lanka using cointegration and auto regressive time series. The cointegration test illustrates that share price index is cointegrated with a specific set of macroeconomic variables, i.e. exchange rate (USD/LKR), money supply, wage rates, wet foreign assets, currency in circulation, imports and exports with 95% confidence. The study also proposes a regression model using Eigen Vector coefficients to predict the behavior of ASPI index in the long run. The model performance, evaluated using the residuals of the test data, represents a random behavior indicating a valid long-run cointegration regression relationship between ASPI and other macroeconomic variables. Future studies involve analysis of the short-run relationship among the macroeconomic variables using Vector Error Correlation Model.
A Comprehensive Review on Nickel (II) And Chromium VI Toxicities - Possible Antioxidant (Allium Sativum Linn) Defenses
Kusal K.Das
Al Ameen Journal of Medical Sciences , 2009,
Abstract: The toxicity associated with nickel (II) and chromium (VI) is mainly due to generation of reactive oxygen species (ROS) with subsequent oxidative deterioration of biological macromolecules. Both nickel and chromium can generate free radicals (FR) directly from molecular oxygen in a two step process to produce superoxide anion and in continued process, produce highly toxic hydroxyl radical. The pro-oxidative effects are compounded by fact that they also inhibit antioxidant enzymes and deplete intracellular glutathione. Garlic (Allium sativum) has played an important dietary and medicinal role throughout the history of mankind. Garlic has the potential to enhance the endogenous antioxidant status in nickel as well as hexavalent chromium induced lipid peroxidation in normal and diabetic rats.
Metal Toxicity and Health
Kusal K.Das
Al Ameen Journal of Medical Sciences , 2009,
Abstract:
GUEST EDITORIAL-The Editorial Policy on Conflict of Interest- A Major Issue for the Indian Medical Journals
Kusal K. Das
Journal of Krishna Institute of Medical Sciences University , 2012,
Abstract:
Regular Expression Matching and Operational Semantics
Asiri Rathnayake,Hayo Thielecke
Electronic Proceedings in Theoretical Computer Science , 2011, DOI: 10.4204/eptcs.62.3
Abstract: Many programming languages and tools, ranging from grep to the Java String library, contain regular expression matchers. Rather than first translating a regular expression into a deterministic finite automaton, such implementations typically match the regular expression on the fly. Thus they can be seen as virtual machines interpreting the regular expression much as if it were a program with some non-deterministic constructs such as the Kleene star. We formalize this implementation technique for regular expression matching using operational semantics. Specifically, we derive a series of abstract machines, moving from the abstract definition of matching to increasingly realistic machines. First a continuation is added to the operational semantics to describe what remains to be matched after the current expression. Next, we represent the expression as a data structure using pointers, which enables redundant searches to be eliminated via testing for pointer equality. From there, we arrive both at Thompson's lockstep construction and a machine that performs some operations in parallel, suitable for implementation on a large number of cores, such as a GPU. We formalize the parallel machine using process algebra and report some preliminary experiments with an implementation on a graphics processor using CUDA.
Static Analysis for Regular Expression Exponential Runtime via Substructural Logics
Asiri Rathnayake,Hayo Thielecke
Computer Science , 2014,
Abstract: Regular expression matching using backtracking can have exponential runtime, leading to an algorithmic complexity attack known as REDoS in the systems security literature. In this paper, we build on a recently published static analysis that detects whether a given regular expression can have exponential runtime for some inputs. We systematically construct a more accurate analysis by forming powers and products of transition relations and thereby reducing the REDoS problem to reachability. The correctness of the analysis is proved using a substructural calculus of search trees, where the branching of the tree causing exponential blowup is characterized as a form of non-linearity.
Testing the Link between Inflation and Economic Growth: Evidence from Asia  [PDF]
Pradana M. Bandula Jayathileke, Rathnayaka M. Kapila Tharanga Rathnayake
Modern Economy (ME) , 2013, DOI: 10.4236/me.2013.42011
Abstract:

The link between inflation and economic growth is one of the most important controversies in the economic literature. This paper investigates the short-run and the long-run relationship between the economic growth and the inflation of three Asian courtiers over the period 1980-2010. The methodology used in the study is cointegration and causality test. Johansen’s cointegration test and bound test approach were performed on the variables which have been tested for the stationary property using Augmented Dickey-Fuller and Phillips and Perron tests in order to examine the cointegration between the economic growth and the inflation. Vector error correction and Granger Causality test were further performed to discover the short run dynamics of the relationship between the variables and identify the direction of causality. The results reveal that there is a long run negative and significant relationship between the economic growth and inflation in Sri Lanka. Whereas no statistically significant relationships were found between the variables in China and in India, a negative and significant short run relationship was found for China. The causality results reveal that there is a unidirectional causality that runs from the economic growth to the inflation in China. The paper discusses the important policy implications of the results.

Use of dietary diversity score as a proxy indicator of nutrient adequacy of rural elderly people in Sri Lanka
Kumari Rathnayake, PAE Madushani, KDRR Silva
BMC Research Notes , 2012, DOI: 10.1186/1756-0500-5-469
Abstract: A sample of 200 apparently healthy elderly people >60y of age were studied. A single 24?h recall was performed to compute dietary diversity indicators. Pearson’s correlation was used to assess the utility of FVS, DDS and DSS as indicators of nutrient adequacy. Sensitivity (Se) and specificity (Spe) analysis were done to determine the most appropriate cut-off points for using FVS and DDS to categorize elderly people with adequate nutrient intake. The average (standard deviation) of the food variety score, dietary diversity score and dietary serving score was 8.4 (2), 4.4 (0.9) and 11.4 (2.5), respectively. Mean adequacy ratio (MAR) of 12 nutrients was 0.39 (39%). Pearson’s correlation coefficients between MAR and FVS was 0.45 (P?<?0.01), for DDS it was 0.48 ( P?<?0.01) and for DSS it was 0.58 ( P?<?0.01). When maximizing sensitivity and specificity, the best cut-off point for achieving 50% of MAR was about 9 and 4.5 for FVS and DDS, respectively.In conclusion, FVS, DDS and DSS were useful proxy indicators of nutrient adequacy of rural elderly people in Sri Lanka. Indeed, the performance of the indicators is improved when considering the quantities of food consumed.Dietary diversity (DD) has been universally identified as a key element of high quality diets. As dietary factors are associated with increased risk of chronic diseases and undernutrition, local and international dietary guidelines recommend to improve the diversity of the diet. Macro and micro nutrient deficiencies are public health concerns in most developing counties including Sri Lanka, due to monotonous, cereal-based diet that lacks diversity [1]. Furthermore, diverse diet reflects the nutrient adequacy of the diet [2]. Several studies have also shown that the overall nutritional quality of the diet is improved with diverse diet [3-5]. Therefore, diversity in the diet is important to meet the requirements for energy and other essential nutrients especially for those who are in the risk of nutrition def
SNP diversity of Enterococcus faecalis and Enterococcus faecium in a South East Queensland waterway, Australia, and associated antibiotic resistance gene profiles
Irani Rathnayake, Megan Hargreaves, Flavia Huygens
BMC Microbiology , 2011, DOI: 10.1186/1471-2180-11-201
Abstract: Total enterococcal counts (cfu/ml) for three/six sampling sites were above the United States Environmental Protection Agency (USEPA) recommended level during rainfall periods and fall into categories B and C of the Australian National Health and Medical Research Council (NHMRC) guidelines (with a 1-10% gastrointestinal illness risk). E. faecalis and E. faecium isolates were grouped into 29 and 23 SNP profiles (validated by MLST analysis) respectively. This study showed the high diversity of E. faecalis and E. faecium over a period of two years and both human-related and human-specific SNP profiles were identified. 81.8% of E. faecalis and 70.21% of E. faecium SNP profiles were associated with genotypic and phenotypic antibiotic resistance. Gentamicin resistance was higher in E. faecalis (47% resistant) and harboured the aac(6')-aph(2') gene. Ciprofloxacin resistance was more common in E. faecium (12.7% resistant) and gyrA gene mutations were detected in these isolates. Tetracycline resistance was less common in both species while tet(L) and tet(M) genes were more prevalent. Ampicillin resistance was only found in E. faecium isolates with mutations in the pbp5 gene. Vancomycin resistance was not detected in any of the isolates. We found that antibiotic resistance profiles further sub-divided the SNP profiles of both E. faecalis and E. faecium.The distribution of E. faecalis and E. faecium genotypes is highly diverse in the Coomera River. The SNP genotyping method is rapid and robust and can be applied to study the diversity of E. faecalis and E. faecium in waterways. It can also be used to test for human-related and human-specific enterococci in water. The resolving power can be increased by including antibiotic-resistant profiles which can be used as a possible source tracking tool. This warrants further investigation.Poor microbiological quality of water results from contamination by microorganisms of human or animal origin and leads to the risk of gastro-enteritis
High Quality DNA Obtained from a Single Seed of Vitis vinifera L. Using Rapid DNA Extraction Method  [PDF]
Ajith Samantha Rathnayake, Josep Allué, Mercè Llugany, Anna Puig-Pujol, Kshanika Hirimburegama, Charlotte Poschenrieder
American Journal of Plant Sciences (AJPS) , 2014, DOI: 10.4236/ajps.2014.513217
Abstract:

Use of a single seed is very useful for genetic studies on Vitis vinifera. However, molecular markers require a fair amount of high purity DNA. Grapevine contains high concentrations of polysaccharides, polyphenols, tannins and other secondary metabolites. These compounds may hamper the DNA isolation processes and subsequent analysis. In this study we have compared two DNA isolation methods: the NucleoSpin Plant II method and a modified protocol from Doyle and Doyle. The average value of 260/280 nm absorption ratio, which is used to assess the purity of DNA and RNA was 1.8 (accepted as “pure” DNA) and 0.9 (presence of protein or other contaminants) for the first and second method, respectively. Using the NucleoSpin protocol, from a single seed (20 - 35 mg) we obtained an average yield of extracted DNA of 24.8 ± 5.2 to 38.4 ± 11.5 ng·mg-1 dry weight. Among the two protocols examined, the NucleoSpin method was more efficient and gave better quality of DNA values compared to those from the modified Doyle and Doyle procedures.

第1页/共30条
每页显示


Home
Copyright © 2008-2017 Open Access Library. All rights reserved.