http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
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, Ye-Qing,Xu, Xin,Lin, Yi-Wei,Chen, Hong,Hu, Zheng-Hui,Xu, Xiang-Lai,Zhu, Yi,Wu, Jian,Zheng, Xiang-Yi,Qin, Jie,Xie, Li-Ping Asian Pacific Journal of Cancer Prevention 2012 Asian Pacific journal of cancer prevention Vol.13 No.12
Insulin-like growth factor-binding protein-3 (IGFBP3) has been identified as a putative tumor suppressor with multifunctional roles in the IGF axis. Recently, there have been a growing body of studies investigating the relation between the IGFBP3 A-202C polymorphism, circulating IGFBP3 and prostate cancer risk, but their outcomes varied leading to controversy. Hence, it is necessary to perform a meta-analysis covering all eligible studies to shed a light on the association of IGFBP3 A-202C and cancer risk. Finally, we included a total of 11 relevant articles between 2003 and 2010 covering 14 case-control studies including 9,238 cases and 8,741 controls for our analysis. Our results showed that A-202C was a marginal risk factor of prostate cancer (allele contrast: OR=1.08, 95% CI :1.01-1.16; dominant model: OR=1.11, 95% CI :1.01-1.22; heterozygote codominant model: OR=1.11, 95% CI :1.03-1.18; homozygote contrast: OR=1.19, 95% CI :1.03-1.37). Stratification analysis revealed that sample size and control source were two major heterogeneous meta-factors especially in the recessive model (source: Population-based control group :p=0.30,I2=16.7%, Hospital-based control group: p=0.20, I2=30.3%; sample size: Small: p=0.22,I2= 32.8%, Medium: p=0.09,I2=48%, Large p=0.60,I2=0.0%); However, contrary to previous findings, no significance was found in racial subgroups. No significant publication bias was found in our analysis. Considering the robustness of the results and the discrepancy among some studies, there might be some unsolved confounding factors, and further more critical large studies are needed for confirmation.
ON THE EVOLUTION OF HIGH-REDSHIFT ACTIVE GALACTIC NUCLEI
Mao, Jirong,Kim, Minsun American Astronomical Society 2016 The Astrophysical journal Vol.828 No.2
<P>We build a simple physical model to study the high-redshift active galactic nucleus (AGN) evolution within the coevolution framework of central black holes (BHs) and their host galaxies. The correlation between the circular velocity of a dark halo V-c and the velocity dispersion of a galaxy sigma is used to link the dark matter halo mass and BH mass. The dark matter halo mass function is converted to the BH mass function for any given redshift. The high-redshift optical AGN luminosity functions (LFs) are constructed. At z similar to 4, the flattening feature is not shown at the faint end of the optical AGN LF. This is consistent with observational results. If the optical AGN LF at z similar to 6 can be reproduced in the case in which central BHs have the Eddington-limited accretion, it is possible for the AGN lifetime to have a small value of 2 x 10(5) years. The X-ray AGN LFs and X-ray AGN number counts are also calculated at 2.0 < z < 5.0 and z > 3, respectively, using the same parameters adopted in the calculation for the optical AGN LF at z similar to 4. It is estimated that about 30 AGNs per deg(2) at z > 6 can be detected with a flux limit of 3 x 10(-17) erg cm(-2) s(-1) in the 0.5-2 keV band. Additionally, the cosmic reionization is also investigated. The ultraviolet photons emitted from the high-redshift AGNs mainly contribute to the cosmic reionization, and the central BHs of the high-redshift AGNs have a mass range of 10(6)-10(8)M(circle dot). We also discuss some uncertainties in both the AGN LFs and AGN number counts originating from the M-BH-sigma relation, Eddington ratio, AGN lifetime, and X-ray attenuation in our model.</P>
Numerical study of 10-year-old child forearm injury
Mao, Haojie,Cai, Yun,Yang, King H. Techno-Press 2014 Advances in biomechanics & applications Vol.1 No.3
Forearm fractures in children are very common among all pediatric fractures. However, biomechanical investigations on the pediatric forearm are rather scarce, partially due to the complex anatomy, closely situated, interrelated structures, highly dynamic movement patterns, and lack of appropriate tools. The purpose of this study is to develop a computational tool for child forearm investigation and characterize the mechanical responses of a backward fall using the computational model. A three-dimensional 10-year-old child forearm finite element (FE) model, which includes the ulna, radius, carpal bones, metacarpals, phalanges, cartilages and ligaments, was developed. The high-quality hexahedral FE meshes were created using a multi-block approach to ensure computational accuracy. The material properties of the FE model were obtained by scaling reported adult experimental data. The design of computational experiments was performed to investigate material sensitivity and the effects of relevant parameters in backward fall. Numerical results provided a spectrum of child forearm responses with various effective masses and forearm angles. In addition, a conceptual L-shape wrist guard design was simulated and found to be able to reduce child distal radius fracture.
Ground effects on wind-induced responses of a closed box girder
Mao, Wenhao,Zhou, Zhiyong Techno-Press 2017 Wind and Structures, An International Journal (WAS Vol.25 No.4
When bridges are constructed with lower heights from the ground, the formed channel between the deck and the ground will inevitably hinder or accelerate the air flow. This in turn will have an impact on the aerodynamic forces on the deck, which may result in unexpected wind-induced responses of bridges. This phenomenon can be referred to "ground effects." So far, no systematic studies into ground effects on the wind-induced responses of closed box girders have been performed. In this paper, wind tunnel tests have been adopted to study the ground effects on the aerodynamic force coefficients and the wind-induced responses of a closed box girder. In correlation with the heights from the ground in two ground roughness, the aerodynamic force coefficients, the Strouhal number ($S_t$), the vortex-induced vibration (VIV) lock-in phenomena over a range of wind velocities, the VIV maximum amplitudes, the system torsional damping ratio, the flutter derivatives, the critical flutter wind speeds and their variation laws correlated with the heights from the ground of a closed box girder have been presented through wind tunnel tests. The outcomes show that the ground effects make the vortex-induced phenomena occur in advance and adversely affect the flutter stability.