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Ju, Minkyu,Mallem, Kumar,Dutta, Subhajit,Balaji, Nagarajan,Oh, Donghyun,Cho, Eun-Chel,Cho, Young Hyun,Kim, Youngkuk,Yi, Junsin Elsevier 2018 Materials science in semiconductor processing Vol.85 No.-
<P><B>Abstract</B></P> <P>Front side textured random pyramids are widely utilized in major industries for the performance enhancement of crystalline silicon (c-Si) solar cells. Random pyramids not only reduce the surface reflectance but also improve the light trapping effect. Therefore, it is necessary to understand the pyramid height affecting the cell performance, further improving cell efficiency. In this work, we present an experimental study to investigate the influence of pyramids size on the contact shading loss mechanism of silver (Ag) screen-printed p-type c-Si solar cells. Three alkaline texture solutions with sodium silicate additives were optimized to develop the small pyramid (0.5–2.0 µm) size, middle pyramid (5.0–9.0 µm) size and large pyramid (10–15 µm) size on the c-Si surface, respectively. It was noticed that screen-printed finger width strongly depends on pyramid size. Even though, same mesh patterns and screen printing conditions resulted in 20 µm widening of metal finger width on the large pyramids as compared to the small pyramids. This was attributed to the increase in the size of cell surface pyramids that not only varied the gap between the screen mesh and cell surface while screen-printing but also hindered the contraction of metal electrodes during the firing process. The c-Si solar cells with large pyramids suffered from an extra shading loss during fabrication, thus, led to the reduction of the short circuit current density (~0.7 mA/cm<SUP>2</SUP>) resulting in lower efficiency (~17.72%) as compared to efficiency (~18.60%) of small pyramid based cells.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Random textured pyramid size effect on the Ag-printed Si solar cells is investigated. </LI> <LI> Anisotropic etching and pyramid size was controlled with NaOH-IPA additive of Na<SUB>2</SUB>SiO<SUB>3</SUB>. </LI> <LI> Improved performance of small pyramid archived of ~0.7 mA/cm<SUP>2</SUP> higher than large pyramid. </LI> <LI> Textured pyramid height and figure contact roughness was confirmed by SEM images. </LI> <LI> Contact widening and shading loss analysis of small to large pyramid cells are studied. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Ju, Minkyu,Lee, Youn-Jung,Balaji, Nagarajan,Cho, Young Hyun,Yi, Junsin Korea Photovoltaic Society 2018 Current Photovoltaic Research Vol.6 No.1
Current major photovoltaic (PV) market share (> 60%) is being occupied by the multicrystalline (mc)-silicon solar cells despite of low efficiency compared to single crystalline silicon solar cells. The diamond wire sawing technology reduces the production cost of crystalline silicon solar cells, it increases the optical loss for the existing mc-silicon solar cells and hence its efficiency is low in the current mass production line. To overcome the optical loss in the mc-crystalline silicon, caused by the diamond wire sawing, next generation texturing process is being investigated by various research groups for the PV industry. In this review, the limitation of surface structure and optical loss due to the reflectivity of conventional mc-silicon solar cells are explained by the typical texturing mechanism. Various texturing technologies that could minimize the optical loss of mc-silicon solar cells are explained. Finally, next generation texturing technology to survive in the fierce cost competition of photovoltaic market is discussed.
Minkyu Ju,Youn-Jung Lee,Nagarajan Balaji,Young Hyun Cho,Junsin Yi 한국태양광발전학회 2018 Current Photovoltaic Research Vol.6 No.1
Current major photovoltaic (PV) market share (> 60%) is being occupied by the multicrystalline (mc)-silicon solar cells despite of low efficiency compared to single crystalline silicon solar cells. The diamond wire sawing technology reduces the production cost of crystalline silicon solar cells, it increases the optical loss for the existing mc-silicon solar cells and hence its efficiency is low in the current mass production line. To overcome the optical loss in the mc-crystalline silicon, caused by the diamond wire sawing, next generation texturing process is being investigated by various research groups for the PV industry. In this review, the limitation of surface structure and optical loss due to the reflectivity of conventional mc-silicon solar cells are explained by the typical texturing mechanism. Various texturing technologies that could minimize the optical loss of mc-silicon solar cells are explained. Finally, next generation texturing technology to survive in the fierce cost competition of photovoltaic market is discussed.
Kim, MinKyu,Ju, Sang Gyu,Chung, Kwangzoo,Hong, Chae-Seon,Kim, Jungkuk,Kim, Jinsung,Ahn, Sung Hwan,Jung, Sang Hoon,Han, Youngyih,Chung, Yoonsun,Cho, Sungkoo,Shin, Dongho,Choi, Doo Ho Published for the American Association of Physicis 2015 Medical physics Vol.42 No.2
<P>A new automatic quality assurance (AutoRCQA) system using a three-dimensional scanner (3DS) with system automation was developed to improve the accuracy and efficiency of the quality assurance (QA) procedure for proton range compensators (RCs). The system performance was evaluated for clinical implementation.</P>
정민규(Minkyu Jung),주재환(Jaehwan Ju),김채원(Chae Won Kim),이창건(Changkun Lee),김용석(Yongsuk Kim) 한국자동차공학회 2013 한국자동차공학회 부문종합 학술대회 Vol.2013 No.5
Manufacturers are making every effort to reduce new car development period, in order to meet customer requests in time of need. To reduced development period, CAE method is used in most fields of vehicle performance. Especially, as for durability performance of body structure, it takes generally long time to finish physical validation using RLDA obtained from proving ground considering time of hardware vehicle building and testing. Also, there are many difficulties in prediction fatigue life of body structure because it is hard to get account fatigue parameter of material and accurate loads on body structure before physical RLDA test. However, CAE method has strong benefits to predict before physical test, under the condition that there is well-correlated CAE model including dynamic loads calculated from virtual dynamic loads. This paper shows the durability CAE method explaining how to use virtual loads and to correlate with multi-channel durability LAB test. And this paper is trying to propose virtual validation methods to predict specific part of body structure fatigue life using virtual loads.
SooHyun Bae,Minkyu Han,Changyoung Kim,Hyeji Lee,안종준,김진형,Byung Ju Kang 대한의학회 2020 Journal of Korean medical science Vol.35 No.10
Background: Usually, high-flow nasal cannula (HFNC) therapy is indicated for de novo acute hypoxemic respiratory failure (AHRF). Although only a few researches have examined the effectiveness of HFNC therapy for respiratory failure with hypercapnia, this therapy is often performed under such conditions for various reasons. We investigated the effectiveness of HFNC therapy for AHRF patients with hypercapnia compared to those without hypercapnia. Methods: All consecutive patients receiving HFNC therapy between January 2012 and June 2018 at a university hospital were enrolled and classified into nonhypercapnic and hypercapnic groups. We compared the outcomes of both groups and adjusted the outcomes with propensity score matching. Results: A total of 862 patients were enrolled, of which 202 were included in the hypercapnic group. HFNC weaning success rates were higher, and intensive care unit (ICU) and hospital mortality was lower in the hypercapnic group than in the nonhypercapnic group (all P < 0.05). However, no statistical differences in HFNC weaning success (adjusted P = 0.623, matched P = 0.593), ICU mortality (adjusted P = 0.463, matched P = 0.195), and hospital mortality (adjusted P = 0.602, matched P = 0.579) were noted from the propensity- adjusted and propensity-matched analyses. Additionally, in the propensity score-matched subgroup analysis (according to chronic lung diseases and causes of HFNC application), there was also no significant difference in outcomes between the two groups. Conclusion: In AHRF with underlying conditions, HFNC therapy might be helpful for patients with hypercapnia. Large prospective and randomized controlled trials are required for firm conclusions.
기능성식품의 구매 및 섭취 실태와 아로니아 첨가식품 개발에 대한 소비자의 인식
박민규(Park, Minkyu),주신윤(Ju, Shinyun),허남주(Heo, Namjoo),이홍미(Lee, Hongmie) 충북대학교 생활과학연구소 2020 생활과학연구논총 Vol.24 No.2
This study was conducted to provide the basic information in order to develop the aronia added functional foods by determining the consumers’s needs and status of consuming functional foods and those with aronia. The subjects were 43 men and 142 women over 20 years of age who had regular income residing Seoul and Gyeonggi area. The information were obtained by using self-administered questionnaire and data were analysed by SPSS 25.0. The proportion of the subjects who had experienced eating aronia and aronia added foods were only 64.9% and 35.1%, suggesting insufficient supply to market yet as of 2019. The subjects evaluated the importance of 8 factors when they purchase the functional foods; physiological active function and easiness to consume the highest (4.19, respectively); patent or certification (4.03), price (3.79), recommendation (3.65), brand (3.61), advertisement or broadcasting (2.75), and design (2.64). More over, ‘physiological function’ was evaluated higher by women, by those graduated with food and nutrition major, by those with more concern of their own health and by those who buy functional foods for their own or family members’ health; ‘the easiness to consume’ by the subjects who had experience of purchasing functional foods; ‘price’ by younger subjects under 30 years of age; ‘brand’ by those with experience of buying the functional foods than by their counterparts, respectively (p<0.05). The most answered reason for dissatisfaction with the foods with aronia was ‘unsatisfactory taste’ (52.4%) and followed by ‘unsatisfactory effectiveness’ (33.3%) and the most wanted type of foods with aronia was beverage (41.8%) followed by jam (26.9%), jelly (11.5%), bakery (10.4%), and sauce such as gochujang (7.1%), which should be reflected in developing new functional foods with aronia.