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Reduction of efficiency droop in GaInN/GaN light-emitting diodes with thick AlGaN cladding layers
An Mao,조제희,E. Fred Schubert,Joong Kon Son,Cheolsoo Sone,하우진,Sunyong Hwang,김종규 대한금속·재료학회 2012 ELECTRONIC MATERIALS LETTERS Vol.8 No.1
GaInN/GaN multiple-quantum-well light-emitting diodes (LEDs) with 0.4 µm-thick AlGaN cladding layers and two quantum wells (QWs), designed for investigating the origin of efficiency droop, are demonstrated to have a lower efficiency droop than typical GaInN/GaN LEDs with 5 QWs. Considering the much less electron leakage over the active region, and the larger carrier density due to the smaller active volume of the LED with AlGaN cladding layers than those of the typical LED, it is suggested that the dominant mechanism responsible for the efficiency droop is electron leakage rather than the Auger recombination which scales with the cubic power of the carrier density.
전모모(Tian, Mao Mao),조명은(Cho, Myung Eun),김미정(Kim, Mi Jeong) 한국실내디자인학회 2016 한국실내디자인학회논문집 Vol.25 No.6
China has already entered the aging society and is predicted to become a super-aged society in 2020. The recent studies identified that the elderly has more interest in ‘Aging-in-Place’ which emphasizes deinstitutionalization since welfare facilities such as care homes and silver towns have separated the elderly from their local communities where they used to live in. The aim of this research is to propose a promising way for smart housing services who support the elderly’s living in their homes, China. This research is to investigate the elderly’s life and to identify their demands on housings for implementing such smart services. The elderly’s living in apartments in Luoyang city, China, were investigated through interviews using a questionnaire survey. The results show that smart housing services should be provided to support the elderly’s health, safety, leisure activities, comfortable living, and social relationships sustainably. In addition, such smart housing services should be intuitive since the elderly need to use easily smart services for their autonomous life in their homes. The smart housing services should be developed in the direction of enhancing the elderly’s healthy and desirable life, and lessening their discomforts due to aging.
Aging-In-Place개념을 적용한 중국 스마트홈 개발에 관한 연구
전모모(Tian, Mao Mao),조명은(Cho, Myung Eun ),김미정(Kim, Mi Jeong) 한국실내디자인학회 2016 한국실내디자인학회 학술대회논문집 Vol.2016 No.10
China has faced various elderly problems relating to housing and health care services because many people in the Chinese society became over sixties. The previous studies show that the concept of Aging-In-Place has not been established in the housing market although the Chinese government presented "a proposal of December 5" emphasizing the adoption of Aging-In-Place in the development of housing for the elderly in China. This research is to investigate the current states of the elderly housings and their demand on smart homes in China. In addition this research is to analyze carers" difficulties and desires in assisting the elderly as a supplementary data. The questionnaire survey was done with fifty old people and fifty carers such as families and friends in apartment complexes to identify their demands respectively on future housings, smart homes. The result show that most respondents do not want to leave their home and move into care facilities as they ages. That is, most of the elderly prefer the realization of Aging-In-Place to care homes, thus the development of smart homes enabling the elderly"s autonomous living in their own housings should be desirable and encouraged. In conclusion, this research will propose a future direction on smart homes for the elderly in China.
Mao, Ying-Ying,Jing, Fang-Yuan,Jin, Ming-Juan,Li, Ying-Jun,Ding, Ye,Guo, Jing,Wang, Fen-Juan,Jiang, Long-Fang,Chen, Kun Asian Pacific Journal of Cancer Prevention 2013 Asian Pacific journal of cancer prevention Vol.14 No.9
Accumulated evidence has indicated that Ephrin A1 (EFNA1) is associated with angiogenesis and tumorigenesis in various types of malignancies, including colorectal cancer (CRC). In the current study, we performed an online search using the public microarray database to investigate whether EFNA1 expression might be altered in CRC tissues. We then conducted a case-control study including 306 subjects (102 cases and 204 well-matched controls) in Xiaoshan County to assess any association between genetic polymorphisms in EFNA1 and CRC susceptibility. Searches in the Oncomine expression profiling database revealed EFNA1 to be overexpressed in CRC tissue compared with adjacent normal tissue. The rs12904 G-A variant located in the 3' untranslated region (UTR) of EFNA1 was observed to be associated with CRC susceptibility. Compared with the AA homozygous genotype, those carrying GA genotype had a decreased risk of developing CRC (odds ratio (OR)=0.469, 95% confidence interval (CI): 0.225-0.977, and P=0.043). The association was stronger among smokers and tea drinkers, however, no statistical evidence of interaction between rs12904 polymorphism and smoking or tea drinking on CRC risk was found. Our results suggest that EFNA1 is involved in colorectal tumorigenesis, and rs12904 A>G polymorphism in the 3' UTR of EFNA1 is associated with CRC susceptibility. Larger studies and further mechanistic investigations are warranted to confirm our findings.
Mao, H.L.,Wang, J.K.,Lin, J.,Liu, J.X. Asian Australasian Association of Animal Productio 2012 Animal Bioscience Vol.25 No.5
This study was conducted to determine the effects of dietary addition of tea saponins (TS) and soybean oil (SO) on fatty acid profile and gene expression of stearoyl-CoA desaturase (SCD) in longissimus dorsi (LD) muscle of growing lambs. Thirty-two Huzhou lambs were assigned to four dietary treatments in a $2{\times}2$ factorial arrangement with main effects of TS (0 or 3 g/d) and SO (0 or 30 g/kg of diet DM). The diet without additives was considered as NTNS (no TS or SO). After a feeding trial for 60 d, four lambs of each treatment were slaughtered to collect the samples of LD muscle. Percentage of trans-11 vaccenic acid was enhanced (p<0.05) in muscle of lambs fed TS and SO. The proportion of total conjugated linoleic acid (CLA) was increased (p<0.05) by SO, but decreased (p<0.05) by TS in LD muscle. The percentage of total saturated fatty acids in muscle was decreased (p<0.05) by addition of TS and SO, while addition of SO increased (p<0.05) the percentage of total polyunsaturated fatty acids. The ratio of cis-9, trans-11 CLA to tran-11 vaccenic acid was decreased (p<0.05) by TS, but increased (p<0.05) by SO. The same effects were observed in SCD mRNA expression. From these results it is indicated that including TS and SO in the diet of growing lambs affect the fatty acid profiles of LD muscle and that the proportion of cis-9, trans-11 CLA in the muscle influenced by TS and SO may be related to the SCD gene expression.
Mao, Aiming,Park, Jong-Hyeok,Han, Gui-Young 한국신재생에너지학회 2009 한국신재생에너지학회 학술대회논문집 Vol.2009 No.06
TiO₂ nanotube arraysdecorated with {alpha}-Fe₂O₃ were prepared by forming a nanotube-like TiO₂ film on a Ti sheet using an anodization process, followed by electrochemical deposition treatment to decorate hematite ({alpha}-Fe₂O₃) nanoparticles on the TiO₂ nanotube arrays. The SEM and XRD results revealed that the {alpha}-Fe₂O₃ nanoparticles were homogeneously embedded on the surface of the TiO₂ nanotube arrays. The activity of hydrogen production by photocatalytic water decomposition for the {alpha}-Fe₂O₃/TiO₂ nanotube array composite was examined under visible light irradiation.
Molecular Analysis Associated with Early Flowering Mutant in Brassica napus
Mao Jiawang 한국식물학회 2021 Journal of Plant Biology Vol.64 No.3
Flowering time in crops is an important agronomic character and is closely related to yield. However, the molecular mechanisms of flowering regulation in rapeseed remain elusive. In the current study, we report a rapeseed mutant with an early flowering (eaf) phenotype. The results of field observation showed that the flowering time of the mutant was about 18 days earlier than that of the wild type (WT, Zhongshuang 11), but there were no significant differences in other agronomic characters. Proteomic and transcriptomic analyses revealed that flowering and hormone-related proteins and genes were significantly differentially expressed between WT and eaf, indicating that the differential expression of flowering and hormone-related genes may be the main reason for early flowering in the mutant. Besides, the up-regulation of stress-related genes in the eaf mutant may be another possible reason of the mutant’s early flowering. Taken together, our findings provide a clue for dissecting the molecular mechanisms of early flowering in the mutant, and also potential materials for rapeseed molecular biology research.
Mao, Zhu,Liu, Zhuo,Chen, Lei,Yang, Jin,Zhao, Bing,Jung, Young Mee,Wang, Xu,Zhao, Chun American Chemical Society 2013 ANALYTICAL CHEMISTRY - Vol.85 No.15
<P>SERRS (surface-enhanced resonance Raman scattering) has been used to develop and optimize a novel and quantitative MTT assay for living cell viability. This highly sensitive method derives from two factors for formazan signal enhancing: the addition of Au nanoparticles and the resonance effect by 632.8 nm of excitation. The results show that the background elements, such as excessive MTT residues, serum, and the drug, did not interfere with the detection of formazan. Moreover, the detection limit of formazan is as low as 1 ng/mL. With the use of this method to quantify metabolically viable cells, dose–response curves of treated and untreated cells with the drug were constructed on the human lung cancer cell A549. The results also show that the Raman signal generated is dependent on the degree of activation of the cells. In comparison to the traditional method, the main advantages of this method are its rapidity (30 min), high-selectivity, high-precision, and cost-effectiveness (0.1 mg/mL MTT) without time-consuming steps and any modifying or labeling procedure. This work reports on an improved research tool that may help researchers apply this method for in situ cell assays.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/ancham/2013/ancham.2013.85.issue-15/ac401254s/production/images/medium/ac-2013-01254s_0010.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/ac401254s'>ACS Electronic Supporting Info</A></P>