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Kwon, Yo Han,Woo, Sang‐,Wook,Jung, Hye‐,Ran,Yu, Hyung Kyun,Kim, Kitae,Oh, Byung Hun,Ahn, Soonho,Lee, Sang‐,Young,Song, Seung‐,Wan,Cho, Jaephil,Shin, Heon‐,Cheol,Kim, Je Y WILEY‐VCH Verlag 2012 Advanced Materials Vol.24 No.38
<P>The first ever demonstration of a cable‐type lithium ion battery architecture with outstanding omni‐directional flexibility is described by Je Young Kim, Heon‐Cheol Shin, and co‐workers on page 5192. The Front Cover image illustrates the unique battery architecture comprising a skeleton frame surrounding an empty space, that is, a hollow‐spiral anode with a multi‐helical structure. This design enables the battery to reliably power an LED screen or an MP3 player even under severe mechanical twisting and bending. </P>
裵炳烈(Byung-Yeol Bae),李知憲(Ji-Heon Lee),李慧姸(Hye-Yeon Lee),朱永雅(Young-Ah Ju),韓炳文(Byung-Moon Han),朴炳柱(Byung-Ju Park),尹同哲(Dong-Chul Yoon) 대한전기학회 2008 전기학회논문지 Vol.57 No.5
This paper describes a single-phase active power filter based on a newly developed digital controller. The developed controller utilizes FFT(Fast Fourier Transform) algorithm to extract the reference signal from the load current, considering the phase-angle delay of each order of harmonics. Optimized technique was applied for whole control algorithm to implement the real-time operation of developed controller. The performance of developed controller for a single-phase active power filter was verified through computer simulations with PSCAD/EMTDC. The feasibility of hardware implementation was confirmed by building and testing a prototype. The developed digital controller for a single-phase active power filter can compensate the harmonic current generated by the power supply for digital equipment.
수분에 의한 Zr계 에너지 물질의 화학적/물리적 노화 및 연소 성능 저하
한병헌(Byung Heon, Han),박윤식(Yoonsik Park),여재익(Jack J Yoh) 한국추진공학회 2019 한국추진공학회 학술대회논문집 Vol.2019 No.11
Zr을 원료로하는 점화제와 ZrNi를 원료로 하는 지연제로 구성된 지연관의 노화현상과, 노화로 인한 절심현상(Ignition failure)을 열적/화학적으로 분석하였다. 열적 분석에는 Differential Scanning Calorimetry(DSC) 와 Thermogravimetry Analysis(TGA)가 사용되었고, 화학적 분석에는 X-ray Photoelectron Spectroscopy(XPS)를 사용하였다. DSC에서 나온 Kinetics를 통해 Modeling and Simulation을 수행하였으며, 절심현상의 원인을 극명하게 보여주었다. 수분에 대한 산화제의 안정성이 노화 현상에 크게 영향을 미쳤으며, 에너지 물질의 열 생성률이 주변 케이스로 열 발산률보다 낮아질 때 절심현상이 발생하는 것으로 나타나, 열 성능 저하가 절심현상의 가장 큰 원인임을 규명하였다.
Yoon Kyung Jang(Yoon Kyung Jang),Eui Jun Choi(Eui Jun Choi),Dong Ook Son(Dong Ook Son),Byung Heon Ahn(Byung Heon Ahn),Jong Chul Han(Jong Chul Han) 대한안과학회 2023 Korean Journal of Ophthalmology Vol.37 No.1
Purpose: To investigate whether postoperative filtering bleb size affects the surgical outcome after trabeculectomy. Methods: In this study, we retrospectively reviewed 145 medically uncontrolled glaucoma patients with intraocular pressure (IOP) values >21 mmHg before surgery and data from ≥2 years of follow-up. Postoperative IOP, filtering bleb size including extent and height, and other clinical factors were measured after trabeculectomy. We divided bleb extent into quadrants and bleb height by 0.5 intervals of corneal thickness. The main outcome measure was surgical success. We confirmed complete success when the IOP was ≤21 mmHg and decreased by >20% from baseline without medication or additional procedures. Qualified success used the same criteria but allowed for medication or additional procedures. Cases with reoperation or two consecutive IOP measurements <6 mmHg were considered failures. Results: A total of 145 eyes of 145 patients was included. The average observation period was 30.8 ± 10.9 months. During multivariate Cox regression analysis, a larger extent of filtering bleb revealed significantly low hazard ratios in both complete and surgical success (0.509 and 0.494, respectively); however, there was no significant relationship between bleb height and surgical outcome. Conclusions: The extent of the filtering bleb was associated with surgical outcomes of trabeculectomy in glaucoma patients.
Byung-Yeol Bae,Jong-Kyou Jeong,Ji-Heon Lee,Byung-Moon Han 전력전자학회 2010 JOURNAL OF POWER ELECTRONICS Vol.10 No.6
This paper describes the development of a new islanding detection method for inverter-based distributed generation systems, which uses a signal cross-correlation scheme between the injected reactive current and the power frequency deviation. The proposed method injects 1% of the reactive current to the rated current which brings about a negligible degradation of the power quality. It discriminates the islanding state, when the calculated cross-correlation index is larger than 0.5. The operational feasibility was verified through computer simulations with PSCAD/EMTDC software and experimental research with a hardware prototype. The proposed method can detect the islanding state without degrading the power quality at the point of common connection. Further study is required to overcome the cancellation of the injected reactive current from multiple distributed generation units interconnected with the utility grid.