Journal of the University of Ruhuna最新文献

{"title":"Effect of Ownership Concentration on Firm Performance: Evidence from Sri Lankan Financial Sector","authors":"D. Samarawickrama, M. Wanniarachchige, K. Weerasinghe","doi":"10.4038/jur.v9i1.7968","DOIUrl":"https://doi.org/10.4038/jur.v9i1.7968","url":null,"abstract":"","PeriodicalId":158329,"journal":{"name":"Journal of the University of Ruhuna","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124737168","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A Layered Approach for Merging Application Ontologies: A Case Study from Agriculture Domain","authors":"S. Amarasinghe, W. A. Indika, Jeevani Goonetilake","doi":"10.4038/JUR.V8I1.7961","DOIUrl":"https://doi.org/10.4038/JUR.V8I1.7961","url":null,"abstract":"Ontology is a machine interpretable way of representing knowledge in a precise and complete way favorable to solve many problems in the field of knowledge engineering. Different knowledge areas evolve with the time and the applications which use ontologies should be updated with new knowledge accordingly. It is more effective to combine the ontologies with new knowledge with the existing application ontologies rather than designing a new ontology from scratch. When combining ontologies, keeping the original usability of the initial ontologies and the heterogeneity of the components of the ontologies are the main obstacles. As there are no universal standard for naming of ontology components, this is a major reason for the heterogeneity problem. Methods for overcoming these problems are needed. In this research, we have proposed two algorithms to overcome the aforementioned problems. These algorithms for finding correspondences of ontology concepts and merging domain specific application ontologies keeping the original usability of the initial ontologies are the main outcomes of this research. The proposed algorithms are evaluated in terms of accuracy by comparing the resultant ontology merged using the proposed algorithm and the resultant ontology merged by an expert. The evaluation results prove that the proposed methodology merges the domain specific application ontologies very similar to the ontology merged by human intervention.","PeriodicalId":158329,"journal":{"name":"Journal of the University of Ruhuna","volume":"74 9","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134426866","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effects of fertilization levels on growth performance of micro-propagated Cryptocoryne wendtii (Water Trumpet)","authors":"W. M. S. Harshani, V. Pahalawattaarachchi, K. Radampola, S. Herath","doi":"10.4038/JUR.V8I1.7962","DOIUrl":"https://doi.org/10.4038/JUR.V8I1.7962","url":null,"abstract":"This study was conducted to evaluate the effects of different fertilization levels on growth performance of micro propagated water trumpet, Cryptocoryne wendtii to find the most suitable hardening medium. Micro-propagated ninety-six individual plants potted in the commonly used substrate of coir particles were used for the experiment and subjected to different fertilization levels of Albert’s solution. Plants were potted just after being taken from the vessels and eight plant pots kept in the tanks (25.5 L water) containing 0.5 gL–1, 1.0 gL–1, and 2.0 gL–1 of Albert’s solution, and fertilizer was not added into the control. Each treatment and control had three replicates and the experiment was conducted for nine weeks under natural light and temperature conditions. At the end of the experiment, plant growth performance in terms of plant height, root height, number of leaves etc. and water quality parameters were compared in One Way Analysis of Variance using SPSS (16.0). The electrical conductivity (EC) of the 0, 0.5, 1.0, 2.0 gL–1 treatments were 0.075, 0.75, 1.5, 3.0 µS/m, respectively. At the end of the experiment, plants grown in 0.5 gL–1 showed the best growth performance giving significantly highest plant height (11.77 ± 0.40 cm), root height (5.77 ± 0.03 cm), number of leaves (10.0 ± 0.3), number of roots (8.3 ± 0.3), wet weight of whole plant (0.3180 ± 0.0200 g), dry weight of whole plant (0.0206 ± 0.0003 g) and the largest leaf area (2.54 ± 0.01 cm2) in compared to other two treatments and control. In contrast, the uptake of Albert’s solution significantly increased with the increasing EC level. The results of this study revealed that, 0.5 gL–1 Albert’s solution is the most suitable fertilization level among tested three fertilization levels for the hardening process of micro-propagated C. wendtii.","PeriodicalId":158329,"journal":{"name":"Journal of the University of Ruhuna","volume":"63 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122013821","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Review article on Alternanthera philoxeroides (Mart.) Griseb (alligator weed); an invasive plant species in Sri Lanka and its control measures","authors":"N. Dissanayake","doi":"10.4038/jur.v8i2.7937","DOIUrl":"https://doi.org/10.4038/jur.v8i2.7937","url":null,"abstract":"","PeriodicalId":158329,"journal":{"name":"Journal of the University of Ruhuna","volume":"119 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133422650","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Trophic status and diversity of fish species in selected tributaries of Bentota River","authors":"W. Guruge","doi":"10.4038/jur.v8i2.7958","DOIUrl":"https://doi.org/10.4038/jur.v8i2.7958","url":null,"abstract":"Present study was carried out to investigate the, abundance and trophic status of fishes inhabiting tributaries of the Bentota River. Fish were sampled using gill nets, seine nets, cast nets and some were also collected from fishermen’s catches harvested at the tributaries of the Benthota River in Katapola, Ganegoda, Avitthawa, Yagirala and Galatara. To investigate the trophic status, stomach contents were analyzed and quantified using the Point method based on the percentage of bio volume per food category. Ten species of fish were recorded from all five sites, including two endemic species, Clarias brachysoma, Channa orientalis and one invasive alien fish Chitala ornata. Some indigenous species such as Puntius vittatus (n=400), Rasbora daniconius (n=134), Puntius dorsalis (n = 42) and Trichogaster pectoralis (n=71) were also caught in reasonable number. Parts of fish (scales, fins and flesh), mollusks, adult insects, insects larvae, macrophytes and digested/detritus matters were identified as main food categories in the stomach. Based on the gut content analysis, three feeding guilds i.e. piscivorous, herbivorous and zooplanktivorous, were identified. High diet overlap values were recorded in species pairs belonged to the same feeding guild i.e. Chitala.ornata- Channa orientalis while low diet overlap values were recorded in species belonged to different feeding guilds. Remains of fins of Channa orientalis, and Rasbora daniconius and some invertebrates observed in stomach contents of C. ornata, indicated its negative impacts on biodiversity in study sites. Therefore urgent attention should be paid to population control of C.ornata and to prevent its further invasion into new habitats.","PeriodicalId":158329,"journal":{"name":"Journal of the University of Ruhuna","volume":"49 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117169334","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Relapse profile and recurrence free survival of breast cancer patients – bridging the gap in Sri Lanka","authors":"Harshini Peiris, L. Mudduwa, N. Thalagala, Kamani Jayathilaka","doi":"10.4038/jur.v8i2.7934","DOIUrl":"https://doi.org/10.4038/jur.v8i2.7934","url":null,"abstract":"This study was designed to determine the profile of recurrences, recurrence free survival (RFS) and the impact of the clinico-pathological features on the RFS of breast cancer (BC) patients in the Southern Sri Lanka. This retro-prospective study included BC patients presented to our unit from May 2006 to December 2012. Tumour grading and scoring for estrogen receptor (ER), progesterone receptor (PR) and Her2 were done by principle investigator. The Chi-square test, Kaplan-Meier model and the Cox-regression model were used for data analysis using SPSS. A total of 923 BC patients were included. Of 923, 188 had at least one recurrence (local-34, distant-154) during a mean follow up period of 45 months. Five year RFS was 74% (local- 94%, distance-78%). The RFS decreased with the increasing tumour size (p=0.002), Nottingham grade (p=0.002), lymph-node stage (p<0.001), pathological stage (p<0.001), NPI (p=<0.001) and with lympho-vascular invasion (p=0.011). ER positive (p=0.032), PR positive (p=0.008) and Her2 negative (p=0.025) tumours had an increased RFS. In the multivariate analysis, lymph node stage1-3 (p<0.001), Nottingham grade 3 (p=0.006) and expression of PR (p=0.024) became significant. \u0000Lymph node stage, Nottingham Grade and expression of PR have an independent effect on the RFS of BC patients in Southern Sri Lanka. Lymph node stage is the best predictor of recurrent breast cancer.","PeriodicalId":158329,"journal":{"name":"Journal of the University of Ruhuna","volume":"73 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124641465","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The 16S rRNA gene and cyanobacterial taxonomy; current problems and future prospects","authors":"Shirani M. K. Widana Gamage","doi":"10.4038/jur.v8i2.7945","DOIUrl":"https://doi.org/10.4038/jur.v8i2.7945","url":null,"abstract":"Research into cyanobacterial diversity dates back to more than 150 years. Advancement in modern molecular, ultrastructural, ecophysiological and in vitro culture techniques broadened our understanding in the cyanobacterial diversity. Molecular data, especially 16S rRNA gene sequence provide basic criteria for present day cyanobacterial taxonomy. As more DNA sequence data become available it came into notice that morphology-based taxonomic classification is unreliable and it could not infer evolutionary relationships. Some strains belonging to the previously assembled taxa which were classified based on traditional morphological distinctness appeared phylogenetically unrelated when their 16S rRNA gene was sequenced. Therefore, this editorial note was written with the objective of highlighting the necessity in revising present system of cyanobacterial classification and importance in establishment of universal criteria for future taxonomic proposals for cyanobacteria. A cyanobacterial phylogenetic tree was reconstructed using past and present 16S rRNA sequence assemblages from the database and from our studies. Phylogenetic tree revealed polyphyletic origin of unicellular order Chroococcales and filamentous order Oscillatoriales. Strains in the genera Pseudanabaena from the present study were phylogenetically more distant from rest of the Oscillatorialeans in the database and may have independently diverged from the common ancestor at an early stage in the evolution. On the other hand, two Leptolyngbya strains from the present study clustered with Leptolyngbya accessions from the database, although two strains shared only 89% sequence identity. It appears that those two strains could be distinct species belong to the genera of Leptolyngbya and each may have independent evolutionary history. This hypothesis was supported by distinct morphological characters shown in axenic cultures. Present study highlight the importance in understanding that molecular data alone could only provide insights into genetic variability and phylogenetic relatedness, but could not recognize phenotypic variability and their ecological importance and ongoing diversification of strains etc. Thus, construction of an accurate taxonomic classification system requires a ‘polyphasic’ approach that combines molecular data with phenotypic, biochemical and ecophysiological data. Also it is necessary to revisit all past assemblages of taxa available in the database in order to avoid future taxonomic mislabelling.","PeriodicalId":158329,"journal":{"name":"Journal of the University of Ruhuna","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121435485","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Guidance from the Senior Engineers during the Undergraduate Training-A Case Study","authors":"Praneeth Wijesinghe, T. Jayawardane","doi":"10.4038/jur.v8i2.7941","DOIUrl":"https://doi.org/10.4038/jur.v8i2.7941","url":null,"abstract":"Senior Engineers have an ethical responsibility to enhance the engineering knowledge and professional experience of trainee engineers who work under their authority through proper supervision and guidance. This research paper investigates the incidents where senior engineers have neglected such kinds of responsibilities as perceived by final year engineering students of a state university in Sri Lanka during their industrial training period as a case study followed with a qualitative survey. An open-ended question was given to 200 final year engineering undergraduates of a state university in Sri Lanka as per the convenient sampling strategy to describe any ethical violation observed or experienced by them during their industrial training. Only 30% had reported such incidents while the rest of the incidents belong to the violation of health and safety practices and integrity issues in engineering practice. Incidents which only belong to less supportive behaviour of senior engineers were selected and analyzed following inductive thematic analysis. This study reveals the emergence of 4 major themes. They are the senior engineers’ unwillingness to guide, assigning inappropriate tasks, unnecessarily blaming and negligence of training schedules. One-sided data collection is the major drawback of this research and further investigations can be done to identify the possible causes for the less supportive behaviour by having a few interviews with selected senior engineers in the industry. The outcomes of this case study will raise the awareness of senior engineers regarding their ethical responsibilities in guiding and supervision of trainee engineers to ensure proper professional development.","PeriodicalId":158329,"journal":{"name":"Journal of the University of Ruhuna","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129374977","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Microplastics and their fate in Marine Environment: A review","authors":"N. Kalutharage","doi":"10.4038/jur.v7i2.7940","DOIUrl":"https://doi.org/10.4038/jur.v7i2.7940","url":null,"abstract":"","PeriodicalId":158329,"journal":{"name":"Journal of the University of Ruhuna","volume":"1 3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126029025","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Air Pollution Tolerance Index (APTI) and Anticipated Performance Index (API) of plants found in Matara city area, Sri Lanka: An approach for recommending plants for landscaping city areas","authors":"R. Rajakaruna, K. Masakorala","doi":"10.4038/jur.v7i2.7950","DOIUrl":"https://doi.org/10.4038/jur.v7i2.7950","url":null,"abstract":"","PeriodicalId":158329,"journal":{"name":"Journal of the University of Ruhuna","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115551965","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}