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Minchul Shin,Myunghoi Kim,Jiseong Kim,Joungho Kim,Seungyoung Ahn IEEE 2014 IEEE transactions on components, packaging, and ma Vol.4 No.1
<P>This paper proposes a wideband continuous-time passive equalizer with an embedded cavity structure that is more compact in size and enables lower-cost processing than conventional technologies. The proposed passive equalizer is composed of a lumped resistor and capacitance in a cavity structure generated by a parasitic channel parasitic component, such as a package ball pad. This equalizer design in which the capacitance is embedded in the cavity structure offers the advantages of reducing the additional occupied printed circuit board (PCB) area and of enabling a small-sized equalizer with a large capacitance for application in high-density systems. For a 40-cm transmission line on PCB with a data rate of 12.5 Gb/s, the measured eye diagram is successfully demonstrated and the eye opening significantly improved to 81.1 mV, with a timing jitter of 28.7 ps.</P>
뇌-컴퓨터 인터페이스 데이터 간 전이 학습을 위한 신호 정렬 기법
김민철(Minchul Kim),황은진(Eunjin Hwang),안민규(Minkyu Ahn) 한국HCI학회 2022 한국HCI학회 학술대회 Vol.2022 No.2
뇌파를 이용하여 의도를 인식하는 기술인 뇌-컴퓨터 인터페이스는 사람마다 다른 뇌파 특성으로 인하여 사용 시 매번 새롭게 뇌파를 측정하고 분류기 모델을 구현해야 한다. 하지만 뇌파를 매번 측정하는 것은 상당한 시간을 필요로 하기에 불필요한 뇌파 측정 및 모델 생성 시간을 줄이기 위한 방법이 필요한 상황이다. 본 연구에서는 기존에 측정된 데이터를 재사용할 시에 신호의 특성이 다른 점을 교정하여 분류기 모델을 효과적으로 구성할 수 있는 상관계수기반 신호 정렬 방법을 제안한다. 분석 결과 데이터를 사용하여 분류기 모델을 구성하는 일반적인 방식은 20.8%의 정확도를 보인 반면 제안한 방법은 58.7% 의 비교적 높은 정확도를 보였다.
정민철,정혜성,김성민,이정훈,박권필,안호근 한국공업화학회 2005 응용화학 Vol.9 No.1
We have been used for the Pt catalyst of cathode electrode in fuel cell. Weak point of Pt electrode are easily deactivated by the CO poisoning which are producing in reaction at electrode. Recent, researchers have developed cathode electrode to avoid the CO poisoning in electrode using the Pt-alloy or another novel metal. We now report Au-carbene complexes as an Au-electrode precursor derived from the reaction of the carbene with the ClAu(PPh₃) complex in THF/MeOH.
A novel role for earthworm peptide Lumbricusin as a regulator of neuroinflammation
Seo, Minchul,Lee, Joon Ha,Baek, Minhee,Kim, Mi-Ae,Ahn, Mi-Young,Kim, Seong Hyun,Yun, Eun-Young,Hwang, Jae-Sam Elsevier 2017 Biochemical and biophysical research communication Vol.490 No.3
<P><B>Abstract</B></P> <P>Recently, we reported that Lumbricusin, an antimicrobial peptide isolated from earthworm <I>Lumbricus terrestris</I>, enhanced neuronal proliferation and ameliorated motor dysfunction and dopaminergic neurodegeneration. Accumulating evidence suggests that neurodegeneration is the primary pathological feature of acute or chronic inflammation mediated by microglia, the resident macrophage of the central nervous system. Therefore, microglial activation inhibitors may be useful as therapeutic agents for neurodegenerative diseases. To determine whether Lumbricusin ameliorates neuroinflammation through inhibition of microglial activation by lipopolysaccharides (LPS), we newly synthesized 9-mer Lumbricusin analogues based on the amino acid sequence of Lumbricusin. One of these, Lumbricusin Analogue 5 (LumA5; QLICWRRFR-NH<SUB>2</SUB>), markedly reduced expression of enzymes (COX-2, iNOS), cytokines (IL-6, IL-1β, TNF-α), and signal transduction factors (AKT, MAPKs, NF-κB) involved in inflammation triggered by LPS <I>in vitro</I> and <I>in vivo</I>. In addition, LumA5 inhibited the cytotoxicity of conditioned medium prepared by LPS-activated BV-2 microglia to neuronal SH-SY5Y cells and improved cell viability. These results indicate that LumA5 may be a potential therapeutic agent for the treatment of various neuroinflammatory conditions.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Lumbricusin, an antimicrobial peptide, showed anti-inflammatory properties. </LI> <LI> LumA5, an analogue of Lumbricusin, reduced cytokines in activated microglia. </LI> <LI> LumA5 reduced the proinflammatory phosphorylation of MAPKs and AKT. </LI> <LI> LumA5 attenuated neurotoxicity <I>in vitro</I> and neuroinflammation <I>in vivo.</I> </LI> </UL> </P>
Application of the van der Pauw method for samples with holes
Oh, Donggeon,Ahn, Cheongeung,Kim, Minchul,Park, Eung-Kyu,Kim, Yong-Sang IOP Pub 2016 Measurement science & technology Vol.27 No.12
<P>Modifications of the original van der Pauw relation were suggested recently. The methods are applicable to samples with a hole, unlike the original van der Pauw relation, but it takes too much time and effort to apply the methods to samples with high randomness. So in this paper we suggest two generalizations of the van der Pauw method which are applicable for two-dimensional homogeneous systems with a finite number of holes. Both methods rely on obtaining a crucial constant of the system, <I>ν</I>. The first method involves setting the probes far from each other while conducting the experiment using a sample with a small hole, approximating a relation that gives <I>ν</I> as a linear function of the area ratio of the hole only. The second method produces an identical sample of known resistivity and thickness to obtain <I>ν</I>, which is believed to be dependent on the geometrical properties only. Unlike the earlier methods, which entailed complex procedures, little in the way of measurements and computation is needed for the new methods. The methods will be very useful in electric experiments or industries which need to measure the resistivity of samples.</P>
A Highly Selective Synthetic Method for Distyrenated Phenol
Son, Seokhwan,Kim, Jinhyun,Ahn, Hogeun,Jang, Mikyeong,Kwak, Wonbong,Jung, Sunghun,Chung, Minchul American Scientific Publishers 2017 Journal of Nanoscience and Nanotechnology Vol.17 No.4
<P>Styrenated phenol is an antioxidant synthesized by catalytic reaction of a Bronsted acid and Lewis acid Composition ratio of compound varies based on the amounts source material and catalyst. In this study the composition of the styrenated phenol of monomer, dimer, trimer product synthesized by designing on experiment for increasing selectively. These styrenated phenol were analyzed using a MALDI-TOF MS, FT/IR Spectrometer, H-1(C-13)-NMR, and Gas Chromatography (GC).</P>