OALib Journal期刊

ISSN: 2333-9721

費用:99美元

投稿

匹配條件: “Chaminda Egodawatta” ,找到相關結果約18條。
列表顯示的所有文章,均可免費獲取
第1頁/共18條
每頁顯示
Uncovering the Footprints of Erosion by On-Farm Maize Cultivation in a Hilly Tropical Landscape
Chaminda Egodawatta,Peter Stamp,Ravi Sangakkara
Agriculture , 2013, DOI: 10.3390/agriculture3030556
Abstract: A hilly region in Sri Lanka was considered to be degraded by erosion driven by intensive tobacco production, but what are reliable indicators of erosion? In addition to determining soil chemical and physical traits, maize was cropped with Nitrogen, Phosphorus and Potassium (NPK, PK) recommended mineral fertilization and without fertilizer (ZERO) in two major seasons(October–January in 2007/2008 and 2008/2009—Seasons 1 and 2 respectively) on 92 farms at inclinations ranging from 0% to 65%. In a subset of steep farms ( n = 21) an A horizon of 6 cm rather than of 26 cm was strong proof of erosion above 30% inclination. Below the A level, the thickness of the horizon was unaffected by inclination. Soil organic matter contents (SOM) were generally low, more so at higher inclinations, probably due to greater erosion than at lower inclination. Maize yields decreased gradually with increasing inclination; at ZERO, effects of climate and soil moisture on yield were easier determined and were probably due to long-term erosion. However, despite an initial set of 119 farms, an exact metric classification of erosion was impossible. NPK strongly boosted yield. This was a positive sign that the deficits in chemical soil fertility were overriding physical soil weaknesses. The study illustrated that chemical soil fertility in these soils is easily amenable to modifications by mineral and organic manures.
Genome-wide SNP discovery in associating with human diseases phenotypes
PH Chaminda Kumanayake
Sri Lanka Journal of Bio-Medical Informatics , 2013, DOI: http://dx.doi.org/10.4038/sljbmi.v3i1.2451
Abstract: Single Nucleotide Polymorphisms or SNPs are a most abundant, stable and simple base pair changes that occur in the genome. It is an important variation that can be used to describe many unsolved problems in modern medicine such as individual variation to disease response, differences in response to treatment, allergies to drug treatment, etc. Monogenic Mendalian diseases are very rear and most of the time the disease has complex multi-genetic involvement. With the advancement of sequencing technologies SNP discovery is becoming fast, accurate and less expensive. As a result the availability of SNP data has become more abundant and is used to create SNPmap and SNPprofile. This SNP map and SNP profile helps to locate the genes that involve some complex diseases like diabetes, vascular diseases, and mental disorders and to describe individual variation in response to treatment as well as finding a drug target in pharmacogenomics. With such developments in Bio-informatics, the dream of “individualized treatment” is becoming a reality.
Ontology Based Information Extraction for Disease Intelligence
Prabath Chaminda Abeysiriwardana,Saluka R. Kodituwakku
International Journal of Research In Computer Science , 2012,
Abstract: Disease Intelligence (DI) is based on the acquisition and aggregation of fragmented knowledge of diseases at multiple sources all over the world to provide valuable information to doctors, researchers and information seeking community. Some diseases have their own characteristics changed rapidly at different places of the world and are reported on documents as unrelated and heterogeneous information which may be going unnoticed and may not be quickly available. This research presents an Ontology based theoretical framework in the context of medical intelligence and country/region. Ontology is designed for storing information about rapidly spreading and changing diseases with incorporating existing disease taxonomies to genetic information of both humans and infectious organisms. It further maps disease symptoms to diseases and drug effects to disease symptoms. The machine understandable disease ontology represented as a website thus allows the drug effects to be evaluated on disease symptoms and exposes genetic involvements in the human diseases. Infectious agents which have no known place in an existing classification but have data on genetics would still be identified as organisms through the intelligence of this system. It will further facilitate researchers on the subject to try out different solutions for curing diseases.
Tuning the properties of complex transparent conducting oxides: role of crystal symmetry, chemical composition and carrier generation
Julia E. Medvedeva,Chaminda L. Hettiarachchi
Physics , 2010, DOI: 10.1103/PhysRevB.81.125116
Abstract: The electronic properties of single- and multi-cation transparent conducting oxides (TCOs) are investigated using first-principles density functional approach. A detailed comparison of the electronic band structure of stoichiometric and oxygen deficient In$_2$O$_3$, $\alpha$- and $\beta$-Ga$_2$O$_3$, rock salt and wurtzite ZnO, and layered InGaZnO$_4$ reveals the role of the following factors which govern the transport and optical properties of these TCO materials: (i) the crystal symmetry of the oxides, including both the oxygen coordination and the long-range structural anisotropy; (ii) the electronic configuration of the cation(s), specifically, the type of orbital(s) -- $s$, $p$ or $d$ -- which form the conduction band; and (iii) the strength of the hybridization between the cation's states and the p-states of the neighboring oxygen atoms. The results not only explain the experimentally observed trends in the electrical conductivity in the single-cation TCO, but also demonstrate that multicomponent oxides may offer a way to overcome the electron localization bottleneck which limits the charge transport in wide-bandgap main-group metal oxides. Further, the advantages of aliovalent substitutional doping -- an alternative route to generate carriers in a TCO host -- are outlined based on the electronic band structure calculations of Sn, Ga, Ti and Zr-doped InGaZnO$_4$. We show that the transition metal dopants offer a possibility to improve conductivity without compromising the optical transmittance.
A Model for Web-Intelligence Index to Evaluate the Web Intelligence Capacity of Government Web Sites of Sri Lanka
Prabath Chaminda Abeysiriwardana,S. R. Kodituwakku
Computer Science , 2015, DOI: 10.9734/BJMCS/2016/22654
Abstract: Web intelligence can be considered as a subset of Artificial Intelligence. It uses existing data in web to produce new data, knowledge and wisdom to support decision making and new predictions for web users. Artificial Intelligence is ever changing and evolving field of computer science and it is extensively used in wide array of web based business applications. Although it is used substantially in web based systems in developed countries, it is not examined whether it is being substantially used in Sri Lanka. Every Sri Lankan citizen depends on Public Service more or less throughout his/ her life time and at least more than 3 times: at birth, marriage and death. So providing most of these services to its citizen, Sri Lankan Government uses more or less of its country web portal. This paper presents a model to evaluate web intelligence capability based on weight to key functionalities with respect to web intelligence. The government websites were checked by the proposed criteria to show the potential of using web intelligent technology to provide website based services. The result indicates that the use of web intelligence techniques openly and publicly to provide web based services through government web portal to its citizens is not satisfactory. It also indicates that lack of using the technologies pertaining to web intelligence in the public service web hinders the most of the advantages that citizen and government can gain from such technological involvement.
Ontology Based Information Extraction for Disease Intelligence
Prabath Chaminda Abeysiriwardana,Saluka R Kodituwakku
Computer Science , 2012, DOI: 10.7815/ijorcs.26.2012.051
Abstract: Disease Intelligence (DI) is based on the acquisition and aggregation of fragmented knowledge of diseases at multiple sources all over the world to provide valuable information to doctors, researchers and information seeking community. Some diseases have their own characteristics changed rapidly at different places of the world and are reported on documents as unrelated and heterogeneous information which may be going unnoticed and may not be quickly available. This research presents an Ontology based theoretical framework in the context of medical intelligence and country/region. Ontology is designed for storing information about rapidly spreading and changing diseases with incorporating existing disease taxonomies to genetic information of both humans and infectious organisms. It further maps disease symptoms to diseases and drug effects to disease symptoms. The machine understandable disease ontology represented as a website thus allows the drug effects to be evaluated on disease symptoms and exposes genetic involvements in the human diseases. Infectious agents which have no known place in an existing classification but have data on genetics would still be identified as organisms through the intelligence of this system. It will further facilitate researchers on the subject to try out different solutions for curing diseases.
Flexible Macroblock Ordering for Context-Aware Ultrasound Video Transmission over Mobile WiMAX
Maria G. Martini,Chaminda T. E. R. Hewage
International Journal of Telemedicine and Applications , 2010, DOI: 10.1155/2010/127519
Abstract: The most recent network technologies are enabling a variety of new applications, thanks to the provision of increased bandwidth and better management of Quality of Service. Nevertheless, telemedical services involving multimedia data are still lagging behind, due to the concern of the end users, that is, clinicians and also patients, about the low quality provided. Indeed, emerging network technologies should be appropriately exploited by designing the transmission strategy focusing on quality provision for end users. Stemming from this principle, we propose here a context-aware transmission strategy for medical video transmission over WiMAX systems. Context, in terms of regions of interest (ROI) in a specific session, is taken into account for the identification of multiple regions of interest, and compression/transmission strategies are tailored to such context information. We present a methodology based on H.264 medical video compression and Flexible Macroblock Ordering (FMO) for ROI identification. Two different unequal error protection methodologies, providing higher protection to the most diagnostically relevant data, are presented. 1. Introduction The most recent network technologies are enabling a variety of new applications thanks to the provision of increased bandwidth and better management of Quality of Service. Nevertheless, telemedical services involving multimedia data are still lacking behind, due to the concern of the end users, that is, clinicians and also patients, about the low quality provided. This is in particular true in the case of wireless and mobile telemedicine services. Wireless and mobile telemedicine underpins applications such as the transmission of video data from an ambulance, the rapid retrieval and remote display of video data stored in hospital databases, remote (first-level) diagnosis in rural areas, for example, robotic teleultrasonography and telesurgery. One of the key challenges is the ability to stream medical video over wireless channels. Although wireless multimedia telemedicine services have been proposed before in [1–5], the application of these technologies in real scenarios has been constrained by the unacceptably poor quality of the medical multimedia data arising from the limited bandwidth. For instance, cardiac ultrasound loops require a very large bandwidth. In diagnostic cardiology it would be desirable to store approximately 30 seconds of dynamic heart images per patient (i.e., three sections of the heart and 10 seconds for each section). Even if frames are digitized with pixels with 8 bits each and
Spinning Carbon Nanotube Nanothread under a Scanning Electron Microscope
Weifeng Li,Chaminda Jayasinghe,Vesselin Shanov,Mark Schulz
Materials , 2011, DOI: 10.3390/ma4091519
Abstract: Nanothread with a diameter as small as one hundred nanometers was manufactured under a scanning electron microscope. Made directly from carbon nanotubes, and inheriting their superior electrical and mechanical properties, nanothread may be the world’s smallest man-made fiber. The smallest thread that can be spun using a bench-top spinning machine is about 5 microns in diameter. Nanothread is a new material building block that can be used at the nanoscale or plied to form yarn for applications at the micro and macro scales. Preliminary electrical and mechanical properties of nanothread were measured. The resistivity of nanothread is less than 10 ?5 ??m. The strength of nanothread is greater than 0.5 GPa. This strength was obtained from measurements using special glue that cures in an electron microscope. The glue weakened the thread, thus further work is needed to obtain more accurate measurements. Nanothread will have broad applications in enabling electrical components, circuits, sensors, and tiny machines. Yarn can be used for various macroscale applications including lightweight antennas, composites, and cables.
Using focus groups to investigate service quality determinants for customer satisfaction in selected university libraries in Sri Lanka
Chaminda Jayasundara,Patrick Ngulube,Mabel K. Minishi-Majanja
South African Journal of Libraries and Information Science , 2010, DOI: 10.7553/76-2-75
Abstract: This study aimed at establishing service quality determinants which may affect customer satisfaction in university libraries in Sri Lanka. Using the literature, 113 service quality determinants were identified. These were then reviewed by eight focus groups in four different universities. Forty of the determinants were perceived to be applicable to their context. The participants also added 14 quality requirements which they thought were not provided for in the list. Finally, the content and face validity of the 54 determinants were evaluated by a panel of experts who ultimately reduced them to 50. This study recommends the use of the identified quality determinants by library administrators and policymakers in the higher education sector in Sri Lanka to gauge the levels of customer satisfaction and assure quality of service.
A theoretical model to predict customer satisfaction in relation to service quality in selected university libraries in Sri Lanka
Chaminda Jayasundara,Patrick Ngulube,Mabel K. Minishi-Majanja
South African Journal of Libraries and Information Science , 2009, DOI: 10.7553/75-2-98
Abstract: University library administrators in Sri Lanka have begun to search for alternative ways to satisfy their clientele on the basis of service quality. This article aims at providing a theoretical model to facilitate the identification of service quality attributes and domains that may be used to predict customer satisfaction from a service quality perspective. The effectiveness of existing service quality models such as LibQUAL, SERVQUAL and SERVPREF have been questioned. In that regard, this study developed a theoretical model for academic libraries in Sri Lanka based on the disconfirmation and performance-only paradigms. These perspectives were considered by researchers to be the core mechanism to develop service quality/customer satisfaction models. The attributes and domain identification of service quality was carried out with a stratified sample of 263 participants selected from postgraduate and undergraduate students and academic staff members from the faculties of Arts in four universities in Sri Lanka. The study established that responsiveness, supportiveness, building environment, collection and access, furniture and facilities, technology, Web services and service delivery were quality domains which can be used to predict customer satisfaction. The theoretical model is unique in its domain structure compared to the existing models. The model needs to be statistically tested to make it valid and parsimonious.
第1頁/共18條
每頁顯示


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

久草在现在线中文字幕