Browsing by Author "Dissanayake, A"

Now showing 1 - 8 of 8

item: Conference-Full-text
169 Invisible Architecture; Integrating Subterranean Brussels in Active Neighbourhood Revitalization
(2015-10-02) Dissanayake, A
Brussels is a city with immense potentials and opportunities. Being at the heart of Europe, it is coherently connected with rest of the world both physically and figuratively. However, these opportunities and connections constantly attract people from around the world; giving way to a heterogenic society of diverse ethnicities and cultures. This heterogenic society creates a strong tension in some quarters of Brussels – especially when there is a prominent arrival magnet as with the case of neighbourhood Fountains with Brussels south railway station in close proximity. As with any infrastructure project, the proposed metro and tram station of Lemonier, is a potential for not only the neighbourhood of Fountains but also for entire metropolis of Brussels. The proposed MetCom program incorporating the Brussels underground gives these commonly mono-functional mobility infrastructure projects a new meaning; transforming them into effective urban public spaces. Introduction of this proposed novel logistic system for urban freight transportation allows new possibilities for the use of existing unused space within the metro stations as well as in the adjoining gray buildings. The project not only helps revitalize the neighbourhood by introducing a new economy but also encourages better interaction of the heterogenic society by providing a place for activity. The project however does not create an architectural object; on the contrary, it creates an invisible architecture
item: Thesis-Abstract
A JDBC middle-ware for data replication
Dissanayake, A; Perera, AS
Data is an important part of today's IT infrastructure: both companies and state institutions rely on database systems to store most of their important data. As companies move toward systems that are distributed, research and development in data-replication is becoming increasingly important. In simple terms, replication is a form of distributing copies of data to other machines Data replication is a widely used approach for providing high availability, fault tolerance and better performance (w.r.t reads). With the data being redundantly available from more than one source user can be shielded from network failures, delays and data source failures. One of the major goals in replication is maintaining data consistency amongst the various replicas. However achieving consistency is a complex problem and it can adversely undermine its advantages. Therefore building an efficient, consistent replicated database is still an open research topic, though both the database community and the distributed systems community have been utilizing replication for nearly three decades. Moreover, if two updates happen concurrently, it is often also required each copy is updated in the same order. This is very expensive in practi can degrade performance of the end application. Hence the choic^vofthe consistency model mostly depends on the application using the replication scheme. For instance mission critical applications need high consistency while ni J mobile applications are willing to trade off consistency, for availability and performance. Most of the researches have therefore focused on a specific application domain and interns implement a particular consistency model, which does not suit everyone. Moreover both the industry and research community seem to favour relaxed consistency models like sequential consistency, because higher consistent models are more restrictive. In this research we propose a novel replication scheme that can be tuned to match varying degrees of consistency requirements, of a wider user community. We implement this replication scheme as a JDBC middleware. Our JDBC implementation can replicate update/insert requests across a large number of nodes (data sources/replicas). The JDBC interface hides the complexity of distribution and replication while providing a consistent and transparent view of the data store to the application developers. I
item: Conference-Abstract
Anomaly detection in complex trading systems
(2017) Ranaweera, L; Vithanage, R; Dissanayake, A; Prabodha, C; Ranathunga, S; classification; feature selection; trading systems
System availability is one of the major requirements expected from systems in the trading domain. In order to prevent system outages that can deteriorate system availability, anomaly detection must be able to assess the status of the system and detect anomalies that can lead to failures on a real-time basis. This paper presents a framework for anomaly detection for complex trading systems based on supervised learning approaches. Multiple feature reduction techniques were experimented with, in order to eliminate the noisy features that were initially derived from the system parameters. A classification technique based on Radial Basis Function (RBF) kernel Support Vector Machine (SVM) along with a feature selection technique built on a tree-based ensemble displayed the most promising results.
item: Thesis-Abstract
Computer aider cost modelling at briefng stagelinked to smm
Dissanayake, A; Kodikara, G
Involvement of the cost advisers -in the early stage of the building design process (briefing stage) for the forecasting of probable cost of projects is often minimal. The traditional pre tender estimating techniques such as unit method, cost per unit floor area method, cube method, approximate quantities method and the like used to forecast the probable cost of projects are not satisfactory. This bars the cost adviser to make the fullest contribution in the early design stage decisions. The surveys conducted in this research revealed the fact that local design practice with respect to design stage estimating is limited to unit method, cost per unit floor area method and later stage approximate quantities method and elemental cost method. The use of computer facility to automate tasks in local practice is very low. Quantity surveyors in design offices use spreadsheet software for calculations. Use of database software or other programming languages in the process of cost advice was not evidenced. This research is, thus, aimed at establishing a computer aided cost model based on bill of approximate quantities properly linked to Standard Method of Measurement (SMM) with the flexibility in application during briefing, sketch plan and working drawing stages. Being linked to SMM, the proposed model ensures transformation of design and cost data into a BOQ prepared in accordance with SMM. The current practice of using bill of approximate quantities for cost forecasting is limited to later stages of the design process since the method requires design information to work upon. This difficulty has been overcome in the proposed model by incorporating design and cost data libraries with computer manipulation. .. A case study was used to generate quantities, compile historical design data, and provide causal relationships to the model. These data coupled with solution neutral design information were used to develop design data library and cost data library of the model which provide sufficient information to make professional judgements at the briefing stage.
item: Conference-Full-text
Invisible architecture; integrating subterranean Brussels in active neighborhood revitalization
(Department of Architecture University of Moratuwa, 2014) Dissanayake, A; Dayaratne, R; Wijesundara, J
Brussels is a city with immense potentials and opportunities. Being at the heart of Europe, it is coherently connected with rest of the world both physically and figuratively. However, these opportunities and connections constantly attract people from around the world; giving way to a heterogenic society of diverse ethnicities and cultures. This heterogenic society creates a strong tension in some quarters of Brussels – especially when there is a prominent arrival magnet as with the case of neighbourhood Fountains with Brussels south railway station in close proximity. As with any infrastructure project, the proposed metro and tram station of Lemonier, is a potential for not only the neighbourhood of Fountains but also for entire metropolis of Brussels. The proposed MetCom program incorporating the Brussels underground gives these commonly mono-functional mobility infrastructure projects a new meaning; transforming them into effective urban public spaces. Introduction of this proposed novel logistic system for urban freight transportation allows new possibilities for the use of existing unused space within the metro stations as well as in the adjoining gray buildings. The project not only helps revitalize the neighbourhood by introducing a new economy but also encourages better interaction of the heterogenic society by providing a place for activity. The project however does not create an architectural object; on the contrary, it creates an invisible architecture.
item: Conference-Full-text
Place with (out) space: the tale of brussels and Colombo
(Department of Architecture, University of Moratuwa, 2013-10-15) Dissanayake, A; Dayarathne, R; Wijesundara, J
Architecture of the west is engaged in an extravagant spatial discourse, sweating to design the perfect buildings and cities; spaces where humans can thrive. The extensive attention given to production and utilization of space, however, has distanced architecture from the fundamentals of the practice; making problems – thus the solutions – single dimensional. This paper revisits the fundamentals of western architecture, questioning the significance of space in its education. The notion of ‘space’ is then critically discussed with regard to ‘place’, where space is metaphorically identified as a stage for the drama – the place – to unfold. The main actors of this drama are the events – further elaborated as a sequence of moments – which enchant the audience – the people – in a seamless suspense. Ultimately, two cities, Brussels and Colombo, where similarities are far apart, are compared with each other, using a thought experiment which provides insight into understanding the urban public space (place) as an intertwined and interrelated – though independent- combination of events.
item: Conference-Full-text
The Relationship between family supportive supervisor behavior and the work-family-conflicts of employees in logistics sector Sri Lanka
(Business Research Unit (BRU), 2021-12-03) Dilathmika, L; Randika, C; Dilantha, N; Wickramaarachchi, G; Dissanayake, A
Work-family conflict has been shown/highlighted in numerous studies to have a negative impact on both physical and psychological health with many consequences. Most jobs in the logistics sector requires working round the clock and involve high job pressure. Under these grounds, the employees in this sector require committing themselves more to work, therefore face work-life conflict which consequently this leads to family conflicts. This is mainly due to lack of time for family matters and subsequently leading to poor outcomes at the workplace as well. The purpose of this study is to identify the relationship between Family Supportive Supervisors Behavior and the Work-Family-Conflicts of employees in logistics sector Sri Lanka, thereby to provide them with the required level of assistance to overcome their Work-Family-Conflicts. This is a quantitative research and a total of 250 employees belonging to various sections of the logistics sector such as procurement, shipping, warehousing, customer service was surveyed using convenient sampling method. A questionnaire method was deployed as the data collection technique. Since excessive working hours and high work pressure are mostly associated with the logistics’ sector operations employees, the questionnaire was distributed mainly among them. The results suggest that employees in the logistics sector of Sri Lanka experience high level of Work-Family-Conflicts, as a result of not having the required level of assistance and attention from their immediate supervisors. Subsequently, results reveal that there is a negative relationship between Family Supportive Supervisors Behavior and the Work-Family-Conflicts of employees in logistics sector Sri Lanka. The study findings can provide the Logistics sector managers with a better understanding of the required relationship between their supervisors’ behaviors, to overcome the work-family-conflicts of the employees in the logistics sector.
item: Conference-Abstract
Rhythmanalysis as a tool for understanding shifting urban life and settings exploratory research in brussels and Colombo
(Department of Architecture, University of Moratuwa, 2013-10-15) Wandeler, KD; Dissanayake, A; Dayarathne, R; Wijesundara, J
This paper deals with the transience of urban realities. It posits that urban planning and design practices have been overwhelmingly concerned with permanence, while often underestimating the impact of time on urban reality and complexity. In view of the emergence and multiplication of various forms of ‘temporary urbanism’ (Bishop and Williams, 2012), the authors explore drivers and conditions for this phenomenon and seek to clarify the relevance of this trend for architectural and planning theory and practice. They then present an exploratory urban research project that explicitly takes time into account as a fourth dimension of urban life. Drawing on the theory of rhythm analysis (Lefebvre, 1995[1962], 2004 [1992]) the project adopted a methodological orientation that was not ‘analytic’ in a strictly positivistic or scientific sense of term, but rather sided with the ‘lived experience’ comparable to participant observation in anthropology (Highmore 2005: 150). This approach is illustrated through fieldwork which the main author devised for students of his course in urban anthropology at the LUCA School of Arts in Brussels. The outputs offer a variety of graphic translations that link ‘lived experience’ to the built environment. A preliminary analysis of these case studies is complemented with a thought- experiment that the second author conducted about Colombo.