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Degradation diagnosis system of photovoltaic panels with mobile application
Beomseok Lee,Jinsung Byun,Myeong-in Choi,Byeongkwan Kang,Sehyun Park IEEE 2014 IEEE transactions on consumer electronics Vol.60 No.3
<P>Recently, the number of buildings and houses in which photovoltaic (PV) systems are installed has increased. However, an issue with the efficiency of the PV system and the degradation phenomenon has been revealed. Consumers who benefit from the PV system experience difficulties monitoring and controlling it because a PV diagnosis system is heavy and expensive to install at home. Furthermore, the existing diagnosis system is not coordinated with a home energy management system. In addition, the accurate performance evaluation of the PV system is required for energy management. Therefore, a new degradation diagnosis system for PV panels for household consumers is proposed in this paper. Additionally, a mobile-type home gateway that has various management applications is proposed. It is demonstrated that, with this mobile-type home gateway applied to the proposed system, consumers can monitor the degradation of the PV system, analyze the efficiency of the PV panels, and save energy at home by using a mobile-type home gateway.</P>
Lee, Hyejin,Shin, Dong Wook,Lee, Tae Hoon,Yang, Hyung-Kook,Ahn, Eunmi,Yoon, Jae-Moon,Lee, Hyun-Ki,Suh, Beomseok,Son, Ki Young,Kim, Jun Suk,Cho, BeLong Wolters Kluwer Health 2016 Medicine Vol.95 No.12
<P><B>Abstract</B></P><P>There is little information on how the change in serum aminotransferase affects mortality. We investigated the association between changes in serum aminotransferase levels and mortality from all causes, cardiovascular disease (CVD), and liver disease.</P><P>Three percent of men from the Korean National Health Insurance database were sampled randomly at the end of 2002. After excluding patients with cancer, CVD, CVD risk factors, or liver disease, those who participated in 2 consecutive rounds of the national health screening examination were included (n = 68,431). The primary outcome was CVD mortality. Secondary outcomes were liver disease mortality and all-cause mortality. Change in metabolic profiles was analyzed based on changes in liver enzyme levels. Elevated levels of serum aminotransferase were associated with CVD, liver disease, and all-cause mortality. Men who had sustained elevation of serum aminotransferase during 2 subsequent liver enzyme tests showed a significantly higher risk of CVD mortality (adjusted hazard ratio [aHR] 1.95; 95% confidence interval [CI] 1.07–3.56, 2.29; 1.27–4.12) than the sustained normal group. In contrast, the normalization group (aHR 1.52, 95% CI 0.82–2.81 for aspartate aminotransferase [AST]; aHR 1.35, 95% CI 0.70–2.61 for alanine aminotransferase [ALT]) and the new elevation group (aHR 1.27, 0.66–2.44 for AST; aHR 0.99, 95% CI 0.49–2.20 for ALT) were not different from the sustained normal group in CVD mortality.</P><P>Individuals with serum aminotransferase elevation, particularly when sustained, are at higher risk of mortality, and should receive appropriate medical attention.</P>
3-D Stereo PIV에 의한 비정상 델타윙 유동특성에 대한 연구
김범석(BeomSeok Kim),이현(Hyun Lee),김정환(JeongHwan Kim),이영호(YoungHo Lee) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.4
Leading edge extension(LEX) in a highly swept shape applied to a delta wing features the modern air-fighters. The LEX vortices generated upon the upper surface of the wing at high angle of attack enhance the lift force of the delta wing by way of increased negative suction pressure over the surfaces. The present 3-D stereo PLY includes the Identification of 2-D cross-correlation equation, stereo matching of 2-D velocity vectors of two cameras, accurate calculation of 3-D velocity vectors by homogeneous coordinate system, removal of error vectors by a statistical method followed by a continuity equation criterion and so on. A delta wing model with or without LEX was immersed in a circulating water channel. Two high-resolution, high-speed digital cameras(1280pixel×1024pixel) were used to allow the time-resolved animation work. The present dynamic stereo pry represents the complicated vortex behavior, especially, in terms of time-dependent characteristics of the vortices at given measuring sections. Quantities such as three velocity vector components, vorticity and other flow information can be easily visualized via the 3D time-resolved post-processing to make the easy understanding of the LEX effect or vortex emerging and collapse which are important phenomena occurring in the field of delia wing aerodynamics.