http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
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.
Lee, Yang-Bong,Raghavan, Sivakumar,Nam, Min-Hee,Choi, Mi-Ae,Hettiarachchy, Navam S.,Kristinsson, Hordur G.,Marshall, Maurice R. The Korean Society of Food Science and Nutrition 2009 Preventive Nutrition and Food Science Vol.14 No.4
Cryotin F could be used for hydrolyzing shrimp byproducts into bioactive ingredients, which could be used as value-added products. The objective of this study was to investigate the optimum condition for antioxidative activities of the enzymatic hydrolysate produced with Cryotin F using response surface methodology with central composite rotatable design. Shrimp byproducts (shells and heads) were hydrolyzed with Cryotin F. The experimental ranges of the independent variables for 20 experimental runs were 28.2-61.8${^{\circ}C}$ reaction temperature, pH 6-10 and 0.5-5.5% enzyme concentration. The degree of hydrolysis for the reaction products was measured. Their antioxidative activities were measured using 1,1-diphenyl-2-picryl-hydrazyl (DPPH) scavenging activity and Fe-chelating activity. The experimental method with central composite rotatable design was well designed to investigate the optimum condition for biofunctional ingredients with antioxidative activities using Cryotin F because of their high R2 values of 0.97 and 0.95 for DPPH-scavenging activity and Fe-chelating activity, respectively. Change in enzyme concentration did not significantly affect their antioxidative activities (p<0.05). Both DPPH scavenging activity and chelating activity against Fe for the enzyme hydrolysates were more affected by the pH of enzyme hydrolysis than by their action temperature. DPPH-scavenging activity was higher at acidic pH than alkali pH, while chelating activity against Few was inversely affected. Hydrolysate of shrimp byproducts showed high antioxidative activities depending on the treatment condition, so the optimum treatment of enzymatic hydrolysate with Cryotin F and other proteases can be applied to shrimp byproducts (shells) and other protein sources for biofunctional ingredients.
Yang-Bong Lee,Sivakumar Raghavan,Min-Hee Nam,Mi-Ae Choi,Navam S. Hettiarachchy,Hordur G. Kristinsson,Maurice R. Marshall 한국식품영양과학회 2009 Preventive Nutrition and Food Science Vol.14 No.4
Cryotin F could be used for hydrolyzing shrimp byproducts into bioactive ingredients, which could be used as value-added products. The objective of this study was to investigate the optimum condition for antioxidative activities of the enzymatic hydrolysate produced with Cryotin F using response surface methodology with central composite rotatable design. Shrimp byproducts (shells and heads) were hydrolyzed with Cryotin F. The experimental ranges of the independent variables for 20 experimental runs were 28.2~61.8℃ reaction temperature, pH 6~10 and 0.5~5.5% enzyme concentration. The degree of hydrolysis for the reaction products was measured. Their antioxidative activities were measured using 1,1-diphenyl-2-picryl-hydrazyl (DPPH) scavenging activity and Fe-chelating activity. The experimental method with central composite rotatable design was well designed to investigate the optimum condition for biofunctional ingredients with antioxidative activities using Cryotin F because of their high R² values of 0.97 and 0.95 for DPPH-scavenging activity and Fe-chelating activity, respectively. Change in enzyme concentration did not significantly affect their antioxidative activities (p<0.05). Both DPPH scavenging activity and chelating activity against Fe for the enzyme hydrolysates were more affected by the pH of enzyme hydrolysis than by their action temperature. DPPH-scavenging activity was higher at acidic pH than alkali pH, while chelating activity against Few was inversely affected. Hydrolysate of shrimp byproducts showed high antioxidative activities depending on the treatment condition, so the optimum treatment of enzymatic hydrolysate with Cryotin F and other proteases can be applied to shrimp byproducts (shells) and other protein sources for biofunctional ingredients.
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.
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.
( 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.
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.