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ShiHyun Kang,JongIl Lee 대한신경정신의학회 2015 PSYCHIATRY INVESTIGATION Vol.12 No.2
Objective-Atypical antipsychotic (AAP) treatment is associated with weight gain and metabolic disturbances such as dyslipidemia and dysglycemia. The metabolic disturbances are usually considered to develop secondary to weight gain. We performed the comparison of metabolic disturbances of three AAP group with different risk of metabolic side effect after adjusting for body mass to investigate whether any metabolic disturbances develop independently from body mass index (BMI). Methods-This cross-sectional study included 174 subjects with schizophrenia who were on 1) monotherapy with clozapine (CL), olanzapine (OL), or quetiapine (QT) (n=61), 2) monotherapy with risperidone (RSP) (n=89), or 3) monotherapy with aripiprizole (ARP), or ziprasidone (ZPS) (n=24) more than 1 year. Association between the prevalence of metabolic disturbances and groups were analysed using logistic regression after adjusting confounding variables including BMI. Analysese of covariance were used to compare the AAP groups in terms of the levels of metabolic parameters. Results-There were significant differences among groups in terms of the prevalence of hypertriglyceridemia (p=0.015), low HDL-cholesterol (p=0.017), and hyperglycemia (p=0.022) after adjusting for BMI. Triglyceride level (p=0.014) and the ratio of triglyceride to HDL-cholesterol (p=0.004) were significantly different among groups after adjusting for BMI. Conclusion-In conclusion, metabolic disturbances are significantly different in AAP groups even after adjusting BMI. AAPs may have direct effect on metabolic parameters. Blood lipid and glucose levels should be monitored regularly regardless of whether patients tend to gain weight.
안시현(ShiHyun Ahn),안정훈(JeongHun Ahn) 한국자동차공학회 2012 한국자동차공학회 지부 학술대회 논문집 Vol.2012 No.4
Most of countries are awaking to the need for cutting fuel consumption and greenhouse gases since 2000. There is a growing need to introduce new safe vehicles for the aged and a physically challenged person. A electric scooter and wheelchair is eco-friendly vehicle making electric battery a alternative to oil and has good features as a mobility assisting vehicle. This paper presents a new method to control Motor Speed with APS and CAN signals a electric scooter and wheelchair. A Motor Speed Control Module designed for new method is composed of MCU(dspic30f6015) and APS signal interface and CAN Transceiver and LCD Controller and switch. These are performed signal conversion from APS signal to CAN signal and motor speed control test with Accelerator Pedal Module and CANoe and MCLV Board.
Ahn, Shihyun,Iftiquar, S M,Cho, Jaehyun,Le, Anh Huy Tuan,Park, Cheolmin,Park, Jinjoo,Lee, Hyunhwa,Hong, Keunkee,Kim, Jung Soo,Bong, Sungjae,Yi, Junsin IOP 2019 Journal of Physics. D, Applied Physics Vol.52 No.3
<P>The efficient capture and absorption of light are important aspects in improving the photovoltaic conversion efficiency of a solar cell. In a two-terminal tandem device, the output current density is limited by the lowest current-generating component sub-cell. We attempted by experiment to improve the current density of both sub-cells, using an inverted pyramid-type textured glass substrate. One of the two surfaces of the glass substrates was textured by semi-anisotropic reactive ion etching (RIE) with a 100 sccm flow rate of SF<SUB>6</SUB> gas, and with 7 <I>µ</I>m × 7 <I>µ</I>m square-shaped etch masks, and obtained an optimum texture of base dimension ~7 <I>µ</I>m, height ~8.5 <I>µ</I>m, tip diameter ~75 nm and tip to tip separation between neighboring pyramids were about 9 <I>µ</I>m. Tandem solar cells that were fabricated on these textured surfaces receive light from the base of these micro-pyramids, thereby enhancing light absorption in the active layers of the device. The shape of the texture and orientation of layers of the tandem solar cell ensured a longer optical path inside the solar cell, leading to higher optical absorption and an improvement in device performance. We observed an increase in the short circuit current density from 11.52 to 14.30 mA cm<SUP>−2</SUP>, and in the device efficiency from 11.97% to 14.22%.</P>
Jian Cui,Shihyun Ahn,Nagarajan Balaji,Cheolmin Park,Junsin Yi 한국태양광발전학회 2016 Current Photovoltaic Research Vol.4 No.2
n-type PERT (passivated emitter, rear totally diffused) bifacial solar cells with boron and phosphorus diffusion as p+ emitter and n+ BSF (back surface field) have attracted significant research interest recently. In this work, the influences of wafer thickness, bulk lifetime, emitter, BSF on the photovoltaic characteristics of solar cells are discussed. The performance of the solar cell is determined by using one-dimensional solar cell simulation software PC1D. The simulation results show that the key role of the BSF is to decrease the surface doping concentration reducing the recombination and thus, increasing the cell efficiency. A lightly phosphorus doped BSF (LD BSF) was experimentally optimized to get low surface dopant concentration for n type bifacial solar cells. Pre-oxidation combined with a multi-plateau drive-in, using limited source diffusion was carried out before pre-deposition. It could reduce the surface dopant concentration with minimal impact on the sheet resistance.