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Hettiarachchi, Ranga,Yokoyama, Mitsuo,Uehara, Hideyuki 통신위성우주산업연구회 2006 Joint Conference on Satellite Communications Vol.2006 No.-
In this paper, we propose a new interference cancellation technique of DS-CDMA for improving communication quality and increasing the number of simultaneous communication users for satellite communications. The DS-CDMA transmitter multiplies each user's signal by a distinct code. The detector receives a signal composed of the sum of all user's signals, which overlap in time and frequency. In a conventional DS-CDMA system, a user’s signal is detected by correlating the entire received signal with that user's code. However, multiple access interference (MAI) is a factor which limits the capacity and performance of the DS-CDMA system. Therefore, this paper proposes a new interference cancellation technique for DS-CDMA based on discovery of spreading codes of interference signals and maximum correlation detection.
( Shyamani Hettiarachchi ),( Lasanthi Daskon-attanayake ),( Dilini Walisundara ) 대구대학교 한국특수교육문제연구소 2018 Asia-Pacific Journal of Intellectual Disabilities Vol.5 No.1
Although symbolically through the ratification of the United Nations Convention on the Rights of Persons with Disabilities (UNCRPD) in February 2016, the Sri Lanka government has pledged support for equal access to employment, the number of persons with disabilities accessing the workforce at present is negligible. In spite of the aim to ‘leave no one behind’, arguably the persons with intellectual disabilities remain the most disadvantaged even within the community of persons with disabilities, and continue to be ‘left behind’ from accessing education and employment. This study aimed to explore and document the perceptions of adults with learning disabilities on accessing and maintaining employment. Unstructured in-depth qualitative interviews were conducted with 16 adults with intellectual disabilities. A qualitative analysis of the interview data was undertaken using the key principles of Framework Analysis to uncover emergent themes. One key theme to emerge was of restricted opportunities to access employment of any form, whether volunteer or paid, or sheltered or mainstream. The only participant in part-time employment was in an unpaid volunteer position arguably reflecting a charity model of disability. When opportunities were available to engage in paid work, in the case of two participants, they reflected contentment, even if appearing vulnerable to exploitation. All the participants not in employment at present, shared ‘dreams’ of accessing to employment in the future, some in realistic fields and some in currently unrealistic fields, often wanting to emulate their siblings. Adults with intellectual disabilities share similar hopes and dreams of employment, in the face of limited frameworks to support transition from education to employment. In order to achieve ‘employment for all’, national inclusive employment frameworks need to be developed at a policy level, which encourage the ‘supported employment model’4 of job-matching and on-the-job training.
Connectivity of Collaborative Robots in Partially Observable Domains
Suranga Hettiarachchi,PaulM. Maxim,William M. Spears,Diana F. Spears 제어로봇시스템학회 2008 제어로봇시스템학회 국제학술대회 논문집 Vol.2008 No.10
Collaborative information processing is vital for a swarm of robots tasked with many different applications. Swarm connectivity is necessary for achieving good collaboration. Our approach to this is a physics-based autonomous robot framework that acts as a distributed mobile sensor network that is capable of maintaining high connectivity during self-organization and movement. The framework, called Physicomimetics, is a robust control scheme built on local interactions between the robots, making it highly scalable, adaptive, and cost effective. This paper presents connectivity results of mobile sensor networks on two partially observable domains ?formation movement through obstacle fields and the self-organization of chain formations.
An Evolutionary Approach to Swarm Adaptation in Dense Environments
Suranga Hettiarachchi 제어로봇시스템학회 2010 제어로봇시스템학회 국제학술대회 논문집 Vol.2010 No.10
The ability for a swarm of mobile agents to quickly adapt in unknown environments and reach a goal while avoiding obstacles and maintaining a formation is extremely important in time critical tasks. We utilize a physics-based autonomous agent framework combined with our DAEDALUS paradigm which allows the agents to learn from the neighboring agents. In traditional approaches, a swarm of agents learn the task in simulation(offline) combined with an evolutionary/genetic algorithm, and a global observer optimizes the swarm performance. In real world(online), the swarm of agents may have to rapidly adapt in unfamiliar environments. When there is no global observer and the online(real world) environment is dense with obstacles compared to offline environment, the performance feedback may be delayed or perturbed by noise, and the rules learned in simulation(offline) may not be sufficient to overcome the navigational difficulties, leaving the swarm to rapidly adapt in new environment. DAEDALUS is a paradigm designed to address these issues, by mimicking more closely the actual dynamics of populations of agents moving and interacting in a task environment. This paper presents an analysis of swarm adaptation using DAEDALUS in high obstacle density environments where agent interactions could be obstructed by obstacles.
A Rapid and Efficient Screening Method for Antibacterial Compound-Producing Bacteria
( Sachithra Amarin Hettiarachchi ),( Su-jin Lee ),( Youngdeuk Lee ),( Young-kyung Kwon ),( Mahanama De Zoysa ),( Song Moon ),( Eunyoung Jo ),( Taeho Kim ),( Do-hyung Kang ),( Soo-jin Heo ),( Chulhong 한국미생물생명공학회(구 한국산업미생물학회) 2017 Journal of microbiology and biotechnology Vol.27 No.8
Antibacterial compounds are widely used in the treatment of human and animal diseases. The overuse of antibiotics has led to a rapid rise in the prevalence of drug-resistant bacteria, making the development of new antibacterial compounds essential. This study focused on developing a fast and easy method for identifying marine bacteria that produce antibiotic compounds. Eight randomly selected marine target bacterial species (Agrococcus terreus, Bacillus algicola, Mesoflavibacter zeaxanthinifaciens, Pseudoalteromonas flavipulchra, P. peptidolytica, P. piscicida, P. rubra, and Zunongwangia atlantica) were tested for production of antibacterial compounds against four strains of test bacteria (B. cereus, B. subtilis, Halomonas smyrnensis, and Vibrio alginolyticus). Colony picking was used as the primary screening method. Clear zones were observed around colonies of P. flavipulchra, P. peptidolytica, P. piscicida, and P. rubra tested against B. cereus, B. subtilis, and H. smyrnensis. The efficiency of colony scraping and broth culture methods for antimicrobial compound extraction was also compared using a disk diffusion assay. P. peptidolytica, P. piscicida, and P. rubra showed antagonistic activity against H. smyrnensis, B. cereus, and B. subtilis, respectively, only in the colony scraping method. Our results show that colony picking and colony scraping are effective, quick, and easy methods of screening for antibacterial compound-producing bacteria.
Phenolics and Antioxidant Activity of Saskatoon Berry (Amelanchier alnifolia) Pomace Extract
Ruiqi Li,Navam Hettiarachchy,Srinivas Rayaprolu,Satchithanandam Eswaranandam,Bruce Howe,Mike Davis,Alok Jha 한국식품영양과학회 2014 Journal of medicinal food Vol.17 No.3
Saskatoon berries (Amelanchier alnifolia Nutt.) have significantly higher levels of anthocyanins (ACY) among berries with potential health benefits. The pomace is a by-product of juice extracted from berries and is a potential source of inexpensive polyphenols. The objectives of this study were to extract the maximum amount of total phenolics from saskatoon pomace, to determine the antioxidant activity, and to identify individual phenolic components. Pomace extracts showed high content of total phenolics, total ACY, and total flavonoids of 43.3, 2.8, and 10.3 g/kg of dried weight (DW) of pomace. A high oxygen radical absorbing capacity value of 119.4 lmol Trolox equivalents/g DW and free radical scavenging activity of pomace extract (200 ppm, 86.8%) were observed. Five major ACY, two flavonols, and three chlorogenic acids were identified and quantified in pomace extracts. This study shows that saskatoon berries pomace rich in antioxidant phenolics could be extracted by ‘‘green’’ solvents (water and ethanol) and used as suitable food product applications.