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VENKATESWARAN VIVEKANANTHAN,Woo Joong Kim,Nagamalleswara Rao Alluri,Yuvasree Purusothaman,Gaurav Khandelwal,김상재 대한기계학회 2021 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.35 No.5
The increasing interest in harvesting mechanical energy from day-to-day activities is gaining huge interest among researchers. We have fabricated a triboelectric nanogenerator (TENG) made of aluminum and PDMS film acting as positive and negative triboelectric layers. The layers are arranged in an arc-shaped structure with an air gap of 1 cm between the layers of the device. The PDMS layer is made by blending the polymer solution with the hardener in an appropriate ratio and dried to make the transparent and flexible polymer film. The device shows a maximum electrical response of 110 V and 260 nA voltage and current with the power density of 2.9 mW/m 2 at 100 MΩ load resistance. Further, the device has been used for lighting green LEDs and charging commercial capacitors. An Arduino board was connected with LED and buzzer, which was triggered by the TENG device. This shows that with the proper usage of electronic components TENG can be used for self-powered sensors and with IoT applications.
A Highly Reliable Self-powered Intruder Identification System using Piezoelectric Composite Films
Venkateswaran Vivekananthan(벤카테스와란 비베카난단),Nagamalleswara Rao Alluri(나가 말레스와라 라오 알루리),Yuvasree Purusothaman(유바스리 푸루소다만),Nirmal Prashanth Maria Joseph (니르말 프라샤츠 마리아 조세프라),Arunkumar Chandrasekhar(아룬쿠마르 찬 대한기계학회 2019 대한기계학회 춘추학술대회 Vol.2019 No.2
Vivekananthan, Venkateswaran,Alluri, Nagamalleswara Rao,Purusothaman, Yuvasree,Chandrasekhar, Arunkumar,Selvarajan, Sophia,Kim, Sang-Jae American Chemical Society 2018 ACS APPLIED MATERIALS & INTERFACES Vol.10 No.22
<P>In contrast with the conventional ceramic/oxide humidity sensors (HSs), a self-powered piezoelectric biopolymer HS with reasonable sensitivity, reliability, and a nontoxic and eco-friendly nature is highly desirable. A piezoelectric nanogenerator (PNG)-driven biopolymer-based HS provides a pathway toward a sustainable and greener environment in the field of smart sensors. For that, a piezoelectric collagen nanofibril biopolymer coated on to a cotton fabric has dual functionality (energy harvesting and sensor). Collagen PNG generates a maximum of 45 V/250 nA upon 5 N and can also work as a sensor to measure various percentages of relative humidity (% RH). The HS shows a linear response with a good sensitivity (0.1287 μA/% RH) in the range of 50-90% RH. These results open a field of eco-friendly multifunctional nanomaterials toward the development of noninvasive, implantable smart bio-medical systems.</P> [FIG OMISSION]</BR>
Nisha Kavassery Venkateswaran,Kumar Ajith Uppunda 대한청각학회 2022 Journal of Audiology & Otology Vol.26 No.3
Background and Objectives: This study compared the effectiveness of two spatial training programs using real and virtual sound sources in refining spatial acuity skills in listeners with normal hearing.Subjects and Methods: The study was conducted on two groups of 10 participants each; groups I and II underwent spatial training using real and virtual sound sources, respectively. The study was conducted in three phases: pre-training, training, and post-training phases. At the pre- and post-training phases, the spatial acuity of the participants was measured using real sound sources through the localization test, and virtual sound sources through the virtual acoustic space identification (VASI) test. The thresholds of interaural time difference (ITD) and interaural level difference (ILD) were also measured. In the training phase, Group I participants underwent localization training using loudspeakers in free field, while participants in Group II were subjected to virtual acoustic space (VAS) training using virtual sound sources from headphones. Both the training methods consisted of 5-8 sessions (20 min each) of systematically presented stimuli graded according to duration and back attenuation (for real source training) or number of VAS locations (for virtual source training).Results: Results of independent t-scores comparing the spatial learning scores (pre vs. post-training) for each measure showed differences in performance between the two groups. Group II performed better than Group I on the VASI test, while the Group I out-performed Group II on the ITD. Both groups improved equally on the localization test and ILD.Conclusions: Based on the present findings, we recommend the use of VAS training as it has practical implications due to its cost effectiveness, need for minimal equipment, and end user usefulness.
Musical Aptitude as a Variable in the Assessment of Working Memory and Selective Attention Tasks
Nisha Kavassery Venkateswaran,Neelamegarajan Devi,Nayagam Nishant N.,Winston Jim Saroj,Anil Sam Publius 대한청각학회 2021 Journal of Audiology & Otology Vol.25 No.4
Background and Objectives: The influence of musical aptitude on cognitive test performance in musicians is a long-debated research question. Evidence points to the low performance of nonmusicians in visual and auditory cognitive tasks (working memory and attention) compared with musicians. This cannot be generalized to all nonmusicians, as a sub-group in this population can have innate musical abilities even without any formal musical training. The present study aimed to study the effect of musical aptitude on the working memory and selective attention. Subjects and Methods: Three groups of 20 individuals each (a total of 60 participants), including trained-musicians, nonmusicians with good musical aptitude, and nonmusicians with low musical aptitude, participated in the present study. Cognitive-based visual (Flanker’s selective attention test) and auditory (working memory tests: backward digit span and operation span) tests were administered. Results: MANOVA (followed by ANOVA) revealed a benefit of musicianship and musical aptitude on backward digit span and Flanker’s reaction time (p<0.05). Discriminant function analyses showed that the groups could be effectively (accuracy, 80%) segregated based on the backward digit span and Flanker’s selective attention test. Trained musicians and nonmusicians with good musical aptitude were distinguished as one cluster and nonmusicians with low musical aptitude formed another cluster, hinting the role of musical aptitude in working memory and selective attention. Conclusions: Nonmusicians with good musical aptitude can have enhanced working memory and selective attention skills like musicians. Hence, caution is required when these individuals are included as controls in cognitive-based visual and auditory experiments. Background and Objectives: The influence of musical aptitude on cognitive test performance in musicians is a long-debated research question. Evidence points to the low performance of nonmusicians in visual and auditory cognitive tasks (working memory and attention) compared with musicians. This cannot be generalized to all nonmusicians, as a sub-group in this population can have innate musical abilities even without any formal musical training. The present study aimed to study the effect of musical aptitude on the working memory and selective attention.Subjects and Methods: Three groups of 20 individuals each (a total of 60 participants), including trained-musicians, nonmusicians with good musical aptitude, and nonmusicians with low musical aptitude, participated in the present study. Cognitive-based visual (Flanker’s selective attention test) and auditory (working memory tests: backward digit span and operation span) tests were administered.Results: MANOVA (followed by ANOVA) revealed a benefit of musicianship and musical aptitude on backward digit span and Flanker’s reaction time (p<0.05). Discriminant function analyses showed that the groups could be effectively (accuracy, 80%) segregated based on the backward digit span and Flanker’s selective attention test. Trained musicians and nonmusicians with good musical aptitude were distinguished as one cluster and nonmusicians with low musical aptitude formed another cluster, hinting the role of musical aptitude in working memory and selective attention.Conclusions: Nonmusicians with good musical aptitude can have enhanced working memory and selective attention skills like musicians. Hence, caution is required when these individuals are included as controls in cognitive-based visual and auditory experiments.
Solvent extraction of nickel(II) ions from aqueous solutions using triethylamine as extractant
정민정,P. Venkateswaran,이영석 한국공업화학회 2008 Journal of Industrial and Engineering Chemistry Vol.14 No.1
In this study, we investigated the solvent extraction of Ni(II) from aqueous solution using triethylamine (TEA) in hexane as the diluent. We monitored the influence of the pH of the aqueous phase, the concentration of TEA, the equilibrium time, the aqueous-to-organic (A/O) ratio, and the initial Ni(II) concentration in the aqueous phase. The extraction of Ni(II) was most effective at pH 4.5. An increase in the extractant concentration from 1.0 to 4.0% in the organic phase increased the extraction efficiency toward nickel ions. The maximum extraction (99.6%) was achieved when using 5.0% TEA (extractant) in hexane (diluent) at remove 50 mg/L of Ni ions from 50 mL of the aqueous phase. The extracted Ni(II) was stripped effectively from the organic phase using 0.5 MHCl as the stripping reagent. The stripped solvent mixture (TEA/hexane), when reused, retained its ability to extract Ni ions. # 2007 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.