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Investigation on Optimization of AlOx Passivation Layer for High-performance p-PERC Solar Cells
Minsoo Jeong(정민수),Yong-jin Kim(김용진),Sang Hee Lee(이상희),Yunae Cho(조윤애),Kyung Taek Jeong(정경택),Hee-eun Song(송희은),Min Gu Kang(강민구),Sungeun Park(박성은),Yoonmook Kang(강윤묵) 한국태양에너지학회 2024 한국태양에너지학회 학술대회논문집 Vol.2024 No.4
Research on the Power Drop of Photovoltaic Module’s Aging Through the Thermal Shock Test
Kang, MinSoo,Jeon, YuJae,Kim, DoSeok,Shin, YoungEui The Korean Institute of Electrical and Electronic 2015 Transactions on Electrical and Electronic Material Vol.16 No.5
While analyzing the specimens before and after the thermal shock test, we found that the power drop rate of the bare cell was 5.08%, while the power drop rate of the ribboned cell was 16.49%. In comparative terms, the efficiency was lower at the ribboned cell than at the bare cell. While analyzing through EL (Electroluminescence) shots and cross sections, we tried to decipher the exact cause of the power drop. Although mere color change of the cell was observed at the surface of the bare cell, no abnormality could be found inside the cell. On the surface of the ribboned cell, the short circuit of gridfinger extended from the front part of the front electrode of the ribboned cells. Therefore, cracks occurred on the surface of the cell. Cracks also appeared inside the cell. While analyzing the I-V curve, we determined an increase in the leakage current and an increase of resistances in series in the bare cell. In the ribboned cell, the resistances in parallel reduced remarkably. An increase of resistances in series could also be verified. Conclusively, we deduced that the power drop rate in the bare cell is a life span of the cell itself; aging is the cause of power drop rate in cells. In case of ribboned cell, the power drop rate was directly influenced by internal cracks and an intermetallic compound layer joining the ribbon at the front electrode.
A PRIVACY MODEL IN UBIQUITOUS ENVIRONMENTS
Minsoo Kang,Hee-Cheol Kim 한국멀티미디어학회 2006 한국멀티미디어학회 국제학술대회 Vol.2006 No.-
In the era of ubiquitous computing, various databases contain a lot of personal information to be shared publicly with others. While it implies much convenience for our daily lives, it also damages privacy. As a matter of fact, many engineers have paid little attention to a problem of privacy until now. In this paper, we propose a privacy model with two flows of information. This model shows that privacy is understood through the flow of information explicated by the relationship between 'self and 'other'. Self information is the one as an object to protect for the sake of ourselves. Other's information concerns if we ourselves select the information about others or not for some kinds of reason. We explain this model through describing scenarios. We finally believe that the proposed model could be a basis to help designers build systems with a balanced view between efficiency and privacy.
HRTF Measurement and Its Application for 3-D Soung Localization
Kang, Kyeong Ok,Kang, Dong-Gyu,Hahn, Minsoo,Jho, Moon Jae,Jeong, Dae-Gwon The Acoustical Society of Korea 1997 韓國音響學會誌 Vol.16 No.e3
Based on the anthropometric data of Korea male adults, a head and torso simulator(HATS) is constructed to measure its head related transfer functions (HRTFs) which can be used for three dimensional (3-D) sound localization. The HRTFs binaural impulse responses, are measured in an anechoic chamber using a burst maximum length sequence (MLS) signal of 65,535 samples and 32,768 samples acquisition at the sampling rate of 75.47kHz. Also measured are the impulse responses of a driving loudspeaker and some headphones for sound reproduction to get the exact HRTF of the HATS-alone. Through a post-processing procedure, the impulse-version HRTFs at the sampling frequency of 44.1 kHz, which have filter lengths of 512 points, are finally obtained. As an application of the measured HRTFs, a 3-D sound processor for headphone reproduction has been developed. The signal intervals to be processed can be selected and each interval is manipulated to have its diretionality and distance information by using corresponding HRTF and energy control.