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( Yong Park ),( Byung Bae Park ),( Ji Yun Jeong ),( Wook Youn Kim ),( Seongsoo Jang ),( Bong Kyung Shin ),( Dong Soon Lee ),( Jae Ho Han ),( Chan-jeoung Park ),( Cheolwon Suh ),( Insun Kim ),( Hyun-so 대한내과학회 2016 The Korean Journal of Internal Medicine Vol.31 No.6
In September 2011, the Korean Society of Hematology Lymphoma Working Party held a nationwide conference to establish a consensus for assessing bone marrow (BM) involvement in patients with lymphoma. At this conference, many clinicians, hematopathologists, and diagnostic hematologists discussed various topics for a uniform consensus in the evaluation process to determine whether the BM is involved. Now that the discussion has matured suffi ciently to be published, we herein describe the consensus reached and limitations in current methods for assessing BM involvement in patients with lymphoma.
Yong Park,In Sun Koo,Dildar Ali,Erwin Buncel,양기열,David M. Wardlaw 대한화학회 2008 Bulletin of the Korean Chemical Society Vol.29 No.11
Ab initio and density functional theory (DFT) studies along with gauge-including atomic orbitals (GIAO) have been carried out on 31P NMR chemical shifts for a series of organophosphorus esters, replacing (RO)P=O by (RS)P=O, (RO)P=S and (RS)P=S functionalities, and for O,O-dimethylthiophosphorate ion (PA−) complexed with metal ions (Ag+, Hg2+). Ab initio and DFT results are in good agreement with experimental 31P NMR chemical shifts. It is shown that the major contribution of 31P NMR chemical shifts derives from the total paramagnetic tensor and variation of d orbital population at P atom by dπ-pπ bond back-donation.
Characteristics of Arc‑Induction Type DC Circuit Breaker Depending on Alteration of Induction Needle
Sang‑Yong Park,최효상 대한전기학회 2020 Journal of Electrical Engineering & Technology Vol.15 No.1
The existing DC (direct current) circuit breakers used for LVDC (low-voltage direct current) extinguish the arc by using an arc chute. The arc chute has an insulating inner barrier and cuts of the current by increasing the length of the arc and raising the arc voltage. If the arc chute fails to extinguish the arc energy by dissipating heat, the arc generation time will increase, thereby raising the possibility of damage to the cut-of contacts. Therefore, we proposed a new arc-induction type DC circuit breaker with key components like mechanical contacts, an induction needle, and a magnet. The arc generated between the contacts is guided to the induction needle and then grounded via a ground wire before being extinguished. The induction needle is a critical component of such mechanism because it induces the arc. The performance of the DC circuit breaker is determined by modifying the induction needle. In this study, the operational characteristics of the arc-induction type DC circuit breaker according to the variation of the induction needle was analyzed using the Maxwell program. The shape and position of the induction needle were changed, and the changes in the electric feld were compared via simulation. As a result, the electric feld value was confrmed to have been improved by up to about 20.5% when the two variables were applied
Molecular identification of Ca2+ channels in human sperm
Jin-YongPark,Hyun-JongAhn,Jung-GyuGu,Keun-HoLee,Jin-SungKim,Ho-WonKang,이정하 생화학분자생물학회 2003 Experimental and molecular medicine Vol.35 No.4
The acrosome reaction is a Ca2+-dependent exocytotic process that is a prerequisite step for fertilization. External calcium entry through voltage-activated Ca2+ channels is known to be essential in inducing the acrosome reaction of mammalian spermatozoa. Due to their complex geometry, however, electrophysiological identification of sperm Ca2+ channels has been limited. Here we identified Ca2+ channel mRNAs expressed in motile human sperm using RT-PCR and their levels were compared using RNase protection assays. L-type, non- L-type, and T-type Ca2+ channel mRNAs were detected by RT-PCR using degenerate primers. Cloning and sequencing of the PCR products revealed α1B, α1C, α1E, α1G, and α1H sequences. RT-PCR using specific prim ers repeatedly detected α1B, α1C, α1E, α1G, and α1H mRNAs, and additionally α1I mRNA. But α1A and α1D messages were not detected. Relative expression levels of the detected Ca2+ channel subtypes were compared by RNase protection assays. The abundance of detected mRNA messages was in the following order: α1H ≥α1G≥α1E≥α1B>α1C>α1I. These findings indicated that human motile sperm express multiple voltage-activated Ca2+ channel RNAs among which T-type and non-L-type channel messages are likely to be predominantly expressed. Based on their relative expression levels, we propose that not only T-type but also non-L-type calcium channels may be major gates for the external calcium influx, required for the acrosome reaction.
An enhanced joint transform correlator applying wavelet functions
Kim, Sung-YongPark, Se-Joon 위덕대학교 산업기술연구소 2000 산업기술연구소 논문집 Vol.4 No.1
JTC(joint transform correlator)는 VanderLugt의 4 f 광 상관시스템의 광축정렬 문제를 해결 할 수 있는 대안으로 널리 사용되어지고 있다. 그러나 전통적인 JTC는 출력 평면에 입력영상들의 자기상관 성분과 상호 상관 성분에 의해서 오인식을 유발하므로 이에 관한 연구가 활발히 진행되고 있다. 본 논문에서는 영상신호분야에 널리 사용되는 wavelet 변환을 전통적인 JTC 시스템에 적용하여 변별력을 개선하였고 인식에 어려움을 유발하는 dc 성분은 디지털 감산연산을 수행하여 제거함으로써 처리 시간을 단축하였다.