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Deoxyribonucleic Acid Sensitive Graphene Field-Effect Transistors
HWANG, Jongseung,KIM, Heetae,LEE, Jaehyun,WHANG, Dongmok,HWANG, Sungwoo The Institute of Electronics, Information and Comm 2011 IEICE transactions on electronics Vol. No.
<P>We have investigated the effect of deoxyribonucleic acid (DNA) adsorption on a graphene field-effect-transistor (FET) device. We have used graphene which is grown on a Ni substrate by chemical vapour deposition. The Raman spectra of our graphene indicate its high quality, and also show that it consists of only a few layers. The current-voltage characteristics of our bare graphene strip FET show a hole conduction behavior, and the gate sensitivity of 0.0034µA/V, which is reasonable with the size of the strip (5×10µm<SUP>2</SUP>). After the adsorption of 30 base pairs single-stranded poly (dT) DNA molecules, the conductance and gate operation of the graphene FET exhibit almost 11% and 18% decrease from those of the bare graphene FET device. The observed change may suggest a large sensitivity for a small enough (nm size) graphene strip with larger semiconducting property.</P>
Jongseung Hwang,David Ahn,Suheon Hong,Hyungkwon Kim,Sungwoo Hwang 대한기계학회 2005 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.19 No.11S
A novel transport measurement scheme of 60 base pairs of poly(dG)-poly(dC) DNA molecules using Au nanoparticles is devised and implemented. Thiol (-SH) terminations are synthesized at both 5’ and 3’ ends of the double stranded DNA molecules and they can be chemisorbed on the Au surface through sulfur atoms by covalent bonding. These thiol-modified ends make chemical bindings with Au nanoparticles and Au nano-gap electrodes, forming a stable electrode-DNA-nanoparticle-DNA-electrode conduction channel. This transport channel is self-formed and is stable due to robust bonding of thiol and Au. The current-voltage characteristic measured from our device shows a nonlinear behavior and the voltage gap is comparable to the result of previous experiment using the same molecules. This self-trapping method by thiol modified DNA molecules would also be a promising technique for efficient nanoparticle trapping.
황성우(Hwang, SungWoo) 한국외국어대학교 동유럽발칸연구소 2012 동유럽발칸연구 Vol.29 No.-
인문공간은 인과 문, 공간의 합성어이다. 인문공간은 인간의 활동이 개입된 곳이다. 인간의 활동이란 인간이 자연상태로부터 벗어나 무언가를 꾸며서 인공적으로 생산한 결과를 지칭한다. 그리고 공간은 문화(人文, 人紋)가 생산되고 축적되는 ‘터’로서의 의미를 갖는다. 인간의 활동은 그러한 터와 상호관계를 맺으면서 그것과 복합적으로 작용하고 역사적으로 퇴적되어 진화·발전한다. 그 결과 나타난 인문공간은 “인간이 자연상태로부터 벗어나 삶을 영위하면서 생산해 낸 모든 물질적, 정신적 가치들이 축적된 터”라고 정의내릴 수 있다. 동일한 맥락에서 러시아의 인문공간은 “고대부터 현재에 이르기까지 러시아인들이 삶을 영위하면서 생산해낸 지식, 신념, 예술, 도덕, 제도, 법률 등 모든 정치적, 경제적, 사회적 가치들이 퇴적된 총체적인 문화적 삶의 공간”이다. The term ‘human space’ is the compound word of human being, culture, and space. Human space is the place which human being’s activities intervened. Human being’s activities are said to be the sort of results which a man from the nature cultivated and artificially produced. And space is the place where such culture was made and accumulated. Natural environment in Russia has determined the definition of human space which Russians inhabited as space of life, and explained the characteristics of material, spiritual values where Russians had cultured, produced, accumulated from the ancient times. So Russians have been making shape of their characteristics by aspects of space surroundings them, and natural environment of Russia, that is to say, Russian human space has symbolized their identity. The relationships between natural environment and human space have been major internal dynamic factors which provoked the interactions of human being and nature from the time when mankind begun cultural activities. Though the scale and characteristic of human space had changed by pressures and threats from outside, natural environment of Russia nevertheless have constantly provided objective conditions of life for Russians.
Jongseung Hwang,David Ahn,Suheon Hong,Hyungkwon Kim,Sungwoo Hwang The Korean Society of Mechanical Engineers 2005 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.19 No.11
<P> A novel transport measurement scheme of 60 base pairs of poly(dG)-poly(dC) DNA molecules using Au nanoparticles is devised and implemented. Thiol (-SH) terminations are synthesized at both 5’ and 3’ ends of the double stranded DNA molecules and they can be chemisorbed on the Au surface through sulfur atoms by covalent bonding. These thiol-modified ends make chemical bindings with Au nanoparticles and Au nano-gap electrodes, forming a stable electrode-DNA-nanoparticle-DNA-electrode conduction channel. This transport channel is self-formed and is stable due to robust bonding of thiol and Au. The current-voltage characteristic measured from our device shows a nonlinear behavior and the voltage gap is comparable to the result of previous experiment using the same molecules. This self-trapping method by thiol modified DNA molecules would also be a promising technique for efficient nanoparticle trapping.</P>
박성우(Sungwoo Park),황진율(Jinyul Hwang) 대한기계학회 2022 대한기계학회 춘추학술대회 Vol.2022 No.11
Reducing carbon emissions is one of the great tasks of mankind. To achieve this sustainable energy future, we need to utilize eco-friendly fuel, and in particular, hydrogen is one of the essential energy sources. However, a transition to a hydrogen economy faces several challenges because this requires new production, storage, and transportation technologies of liquid hydrogen (LH2). The Korean government aims to produce 5.2 million hydrogens by 2030. In the present work, we focus on the development of the transportation of LH2 through a tank trailer. We conduct a numerical simulation of sloshing phenomena within an LH2 tank to estimate the wall pressure variation and the boil-off gas (BOG) during overland transport. We will examine the relationship between the sloshing phenomena and BOG in future efforts.
Recognition, classification, and prediction of the tactile sense
Chun, Sungwoo,Hwang, Inyoung,Son, Wonkyeong,Chang, Joon-Hyuk,Park, Wanjun The Royal Society of Chemistry 2018 Nanoscale Vol.10 No.22
<P>The emulation of the tactile sense is presented with the encoding of a complex surface texture through an electrical sensor device. To achieve a functional capability comparable to a human mechanoreceptor, a tactile sensor is designed by employing a naturally formed porous structure of a graphene film. The inherent tactile patterns are achievable by means of proper analysis of the electrical signals that the sensor provides during the event of touching the interacting objects. It is confirmed that the pattern-recognition method using machine learning is suitable for quantifying human tactile sensations. The classification accuracy of the tactile sensor system is better than that of human touch for the tested fabric samples, which have a delicate surface texture.</P>