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Enhancing PV modules efficiency and output power by applied laser patterned glass
Kim Minje,Jeon Youngwoo,Kim Hong-Il,Park Jinjoo 한국물리학회 2023 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.82 No.11
The power of a PV module afects the amount of incident light collected by the cells. It causes optical loss in the process of modularizing solar cells. Optical loss in the PV module is refected due to refractive index mismatch at the air/glass interface. To reduce the optical loss, we form periodic patterns using a femtosecond laser, which is a non-thermal process and form various patterns through a chemical etching process. The laser patterned glass having a light-trapping structure with a periodic pattern improved transmittance of 1.59% in the visible ray region (380–780 nm) and haze ratio of 55% at 550 nm. Laser patterned glass was applied to the module, and the power was improved by 1.56% with a current gain of 1.56% due to the light-trapping structure.
To develop the classification method of Agricultural by-productions for biogas production
Minjee Kim,Sanghun Kim 한국인터넷방송통신학회 2015 International Journal of Internet, Broadcasting an Vol.7 No.2
The objective of this study was to develop the classification method of various organic wastes. Specifically, the effects of proximate composition on the biogas production and degradation rates of agricultural by-production was investigated and a new standards for mixture of various organic wastes based on proximate composition combination was developed. Agricultural by-products (ABPs) with medium total carbohydrate, medium crude protein and low fat contents demonstrated the single step digestion process. ABPs with low total carbohydrate, high crude protein and high fat contents demonstrated the two step digestion process of Diauxic growth. The single ABP (Class No. 15) and the mixed ABPs (Class No. 12+18, 6+12+22, 9+12+18) after 10days showed the similar biogas yield pattern. We can use the classification method for the more ABPs and organic wastes from factory and municipal waste treatment plant for the high efficient biogas production.
To develop the classification method of Agricultural by-productions for biogas production
Kim, Minjee,Kim, Sanghun The Institute of Internet 2015 International Journal of Internet, Broadcasting an Vol.7 No.2
The objective of this study was to develop the classification method of various organic wastes. Specifically, the effects of proximate composition on the biogas production and degradation rates of agricultural by-production was investigated and a new standards for mixture of various organic wastes based on proximate composition combination was developed. Agricultural by-products (ABPs) with medium total carbohydrate, medium crude protein and low fat contents demonstrated the single step digestion process. ABPs with low total carbohydrate, high crude protein and high fat contents demonstrated the two step digestion process of Diauxic growth. The single ABP (Class No. 15) and the mixed ABPs (Class No. 12+18, 6+12+22, 9+12+18) after 10days showed the similar biogas yield pattern. We can use the classification method for the more ABPs and organic wastes from factory and municipal waste treatment plant for the high efficient biogas production.
Akt3 knockdown induces mitochondrial dysfunction in human cancer cells
Kim, Minjee,Kim, Young Yeon,Jee, Hye Jin,Bae, Sun Sik,Jeong, Na Young,Um, Jee-Hyun,Yun, Jeanho Oxford University Press 2016 Acta biochimica et biophysica Sinica Vol.48 No.5
<P>Akt/PKB plays a pivotal role in cell proliferation and survival. However, the isotype-specific roles of Akt in mitochondrial function have not been fully addressed. In this study, we explored the role of Akt in mitochondrial function after stable knockdown of the Akt isoforms in EJ human bladder cancer cells. We found that the mitochondrial mass was significantly increased in the Akt1-and Akt3-knockdown cells, and this increase was accompanied by an increase in TFAM and NRF1. Akt2 knockdown did not cause a similar effect. Interestingly, Akt3 knockdown also led to severe structural defects in the mitochondria, an increase in doxorubicin-induced senescence, and impairment of cell proliferation in galactose medium. Consistent with these observations, the mitochondrial oxygen consumption rate was significantly reduced in the Akt3-knockdown cells. An Akt3 deficiency-induced decrease in mitochondrial respiration was also observed in A549 lung cancer cells. Collectively, these results suggest that the Akt isoforms play distinct roles in mitochondrial function and that Akt3 is critical for proper mitochondrial respiration in human cancer cells.</P>
Effects of ICT Ability of the Elderly People for the Acceptability of Conversational Agent
Minjee Kim,Na Kyoung You,Yoonki Kim,Sowon Hahn,Myung Hwan Yun 대한인간공학회 2017 대한인간공학회 학술대회논문집 Vol.2017 No.4
Objective: This research is an analysis of how ICT ability are affected in each acceptance of factors in conversational agent, to invigorate the use of conversational agent for elderly people. Background: With the rapid increase in the population of elderly people, the ability of having independence and participating in social activities are one of the main issues to provide solutions for the problems of the aged. The control method for conversational agent is intuitive as it does not require an input device. This allows easier adaptation of interaction method even for the elderly people with less experience with ICT. Method: We recorded eight different conversation scenarios formulated for this research in advance, using the text-to-speech program. The laboratory was set to allow conversational interaction by transmitting the voice converted to the speaker through computer, upon hearing the articulations of the participants over a partition. The ICT ability of the participants, and acceptance of conversational agent was measured through a survey by seven-point Likert scale. Results: In order to enhance the acceptance of conversational agent among elderly people, it is required to develop a new design technique allowing elderly people to form trust towards conversational agent by perceiving it as a social presence. Moreover, it is necessary to consider the importance of elderly people to acknowledge the sociability and usefulness of conversational agent. Conclusion: In this research we compared various factors of acceptance among elderly people, utilizing conversational agent. Conversational agent would henceforth function as an opportunity not only for elderly people, but also for the context and users with difficulty controlling devices with certain body parts.