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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.
Solution to Some Key Problems of Self-exciting Electronic Ballast
Mao, Peng,Zhang, Weiping,Zhang, Mao The Korean Institute of Electrical and Electronic 2014 Transactions on Electrical and Electronic Material Vol.15 No.1
Self-exciting electronic ballast, of small size, and low cost, and high power, with no stroboscopic effect, no noise, is widely used in the general lighting market. This paper describes the cause of high switching loss of self-exciting electronic ballast, based on its operational principle; then, to reduce the switch temperature and increase the reliability of the product, the drive circuit has been improved, to achieve soft-switching. The theory analysis, simulation and experimental result prove the feasibility and compatibility of this new method in practice. Finally, the design procedure and winding method of the self-exciting current transformer are introduced.
Mao, Peng,Zhang, Mao,Zhang, Weiping The Korean Institute of Power Electronics 2014 JOURNAL OF POWER ELECTRONICS Vol.14 No.5
Phase-locked loops (PLL) based on the synchronous reference frame (SRF-PLL) have recently become the most widely-used for grid synchronization in three phase grid-connected inverters. However, it is difficult to study their performance since they are nonlinear systems. To estimate the performances of a SRF-PLL, a canonical small-signal linearized model has been developed in this paper. Based on the proposed model, several significant specifications of a SRF-PLL, such as the capture time, capture rang, bandwidth, the product of capture time and bandwidth, and steady-state error have been investigated. Finally, a noise model of a SRF-PLL has been put forward to analyze the noise rejection ability by computing the SNR (signal-to-noise ratio) of a SRF-PLL. Several simulation and experimental results have been provided to verify and validate the obtained conclusions. Although the proposed model and analysis method are based on a SRF-PLL, they are also suitable for analyzing other types of PLLs.
Cytogenetical Identification in Seven Species of Elytrigia Desv.
Mao Peisheng,Wang Xinguo,Huang Ying,Meng Lin,Mao Peichun 한국초지조사료학회 2009 한국초지조사료학회 학술대회논문집 Vol.2009 No.08
The ploid level of 46 germplasms of Elytrigia Desv. were observed and determined with the microscope, which are from 21 countries and areas that United States of America offered. The results showed these accessions were grouped into three distinct ploid levels including diploidy, tetraploidy and hexaploidy in E. intermedia, E. repens, E. elongata, E. pontica, E. caespitosa, E. juncea, E. alatavica. There were 24 diploid accessions, 1 tetraploidy and 1 hexaploidy in E. intermedia; 4 diploid accessions and 3 tetraploidy in E. repens, 6 texaploidy and 1 hexaploidy in E. elongata, 1 diploidy and 2 tetraploidy in E. pontica, all of E. caespitosa, E. juncea and E. alatavica were diploidy.
The Design and Realization of a Popular Science Long Corridor Based on 3D Stereo Technology
Aiying Mao,Pengxiang Gao,Airu Mao,Yuanyuan Song,Jinxia Yu 보안공학연구지원센터 2016 International Journal of Multimedia and Ubiquitous Vol.11 No.6
Through the design and technical realization of a popular science long corridor based on 3D stereo technology, three hot applications of 3D technology including 3D folding technology, 3D holographic imaging technology and 3D printing technology were introduced in the paper. The three techniques as a whole in the popular science long corridor display the method to decrease the realization cost of the popular science long corridor. The interactive part of the two-dimensional animation was added into the popular science long corridor to reflect truly the effect of the computer technology integrating application.
Solution to Some Key Problems of Self-exciting Electronic Ballast
Peng Mao,Weiping Zhang,Mao Zhang 한국전기전자재료학회 2014 Transactions on Electrical and Electronic Material Vol.15 No.1
Self-exciting electronic ballast, of small size, and low cost, and high power, with no stroboscopic effect, no noise,is widely used in the general lighting market. This paper describes the cause of high switching loss of self-excitingelectronic ballast, based on its operational principle; then, to reduce the switch temperature and increase thereliability of the product, the drive circuit has been improved, to achieve soft-switching. The theory analysis,simulation and experimental result prove the feasibility and compatibility of this new method in practice. Finally, thedesign procedure and winding method of the self-exciting current transformer are introduced.