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Lee, Seongjoo,Lee, Jangwoo,Lee, Mun-Kyo,Nah, Sun-Phil,Song, Minkyu The Institute of Electronics and Information Engin 2013 Journal of semiconductor technology and science Vol.13 No.5
A fractional folding analog-to-digital converter (ADC) with a novel arithmetic digital encoding technique is discussed. In order to reduce the asymmetry errors of the boundary conditions for the conventional folding ADC, a structure using an odd number of folding blocks and fractional folding rate is proposed. To implement the fractional technique, a new arithmetic digital encoding technique composed of a memory and an adder is described. Further, the coding errors generated by device mismatching and other external factors are minimized, since an iterating offset self-calibration technique is adopted with a digital error correction logic. A prototype 8-bit 1GS/s ADC has been fabricated using an 1.2V 0.13 um 1-poly 6-metal CMOS process. The effective chip area is $2.1mm^2$(ADC core : $1.4mm^2$, calibration engine : $0.7mm^2$), and the power consumption is 88 mW. The measured SNDR is 46.22 dB at the conversion rate of 1 GS/s. Both values of INL and DNL are within 1 LSB.
이문교(Mun-Kyo Lee),장유신(YuShin Chang),정상원(Sang-Won Jung) 제어로봇시스템학회 2012 제어로봇시스템학회 합동학술대회 논문집 Vol.2012 No.7
본 논문에서는 라디오미터 기술을 이용하여 사람의 옷 속에 은닉된 플라스틱이나 금속, 폭발물 등을 투시 영상화 할 수 있는 밀리미터파 수동 이미징 시스템을 설계 및 제작하였다. 설계된 시스템은 기계적 주사 방식을 통해, 3차원 공간의 물체로부터 자체 방사되는 밀리미터파 에너지를 각 픽셀별 전기신호로 바꾸어 2차원 영상화하였다. 제작된 시스템은 물리적 검색없이 3m 거리에 있는 은닉물체를 영상화할 수 있다.
Eun Kyo Ko,Han Gyeol Lee,Sangmin Lee,Junsik Mun,Jinkwon Kim,Ji Hye Lee,Tae Heon Kim,Jin-Seok Chung,Suk Bum Chung,Miyoung Kim,Seo Hyoung Chang,Tae Won Noh 한국자기학회 2021 한국자기학회 학술연구발표회 논문개요집 Vol.31 No.1
In the field of oxide heterostructure engineering, there have been extensive efforts to couple the various functionalities of each material. The Berry curvature-driven magnetotransport of SrRuO3 ultrathin films is currently receiving a great deal of attention because it is extremely sensitive to extensive physical parameters. Although this is beneficial in terms of heterostructure engineering, it renders transport behavior vulnerable to nanoscale inhomogeneity, resulting in artifacts called “hump anomalies”. Here, we develop a method to tune the magnetotransport properties of SrRuO3 ultrathin films capped by LaAlO3 layers. We systematically controlled the kinetic process by varying the pressure during LaAlO3 layer deposition and investigated the effects on nanoscale inhomogeneity in SrRuO3 films. We found that the high-kinetic energy of the capping layer adatoms induces stoichiometric modification and nano-scale lattice deformation of the underlying SrRuO3 layer. The control of kinetics provides us a way to modulate magnetization and the associated magnetotransport of the SrRuO3 layer.
Seongjoo Lee,Jangwoo Lee,Mun-Kyo Lee,Sun-Phil Nah,Minkyu Song 대한전자공학회 2013 Journal of semiconductor technology and science Vol.13 No.5
A fractional folding analog-to-digital converter (ADC) with a novel arithmetic digital encoding technique is discussed. In order to reduce the asymmetry errors of the boundary conditions for the conventional folding ADC, a structure using an odd number of folding blocks and fractional folding rate is proposed. To implement the fractional technique, a new arithmetic digital encoding technique composed of a memory and an adder is described. Further, the coding errors generated by device mismatching and other external factors are minimized, since an iterating offset self-calibration technique is adopted with a digital error correction logic. A prototype 8-bit 1GS/s ADC has been fabricated using an 1.2V 0.13 um 1-poly 6-metal CMOS process. The effective chip area is 2.1 mm²(ADC core : 1.4 mm² , calibration engine : 0.7 mm²), and the power consumption is 88 mW. The measured SNDR is 46.22 dB at the conversion rate of 1 GS/s. Both values of INL and DNL are within 1 LSB.
이상인산칼슘 스캐폴드의 3차원적으로 상호 연결된 미세 기공이 골아세포 거동에 미치는 영향
이문환(Mun-Hwan Lee),유창국(Changkook You),이효진(Hyo-Jin Lee),권태엽(Tae-Yub Kwon),김교한(Kyo-Han Kim) 대한치과재료학회 2013 대한치과재료학회지 Vol.40 No.4
The objective of this study was to evaluate the effect of interconnective micropore on osteoblast proliferation and spreading. The micropores of scaffold were observed by field emission scanning electron microscope. Surface roughness of slurry coated surface was determined by the atomic force microscope. Contact angle goniometer was used to evaluate differences in contact angle between surfaces. MTT (3-[4,5-dimethylthiazol-2-yl]-2,5-diphenyl tetrazolium bromide) assay was used to measure the cell proliferation. The surface roughness of microporous specimens was higher than that of non-microporous specimen. The contact angles of microporous specimens were lower than that of non-microporous specimen. Cell spread was greater on microporous scaffolds than non-microporous scaffolds. In addition, cell proliferation was increased when cells were cultured on microporous scaffold. The result demonstrated that interconnective micropores of biphasic calcium phosphate scaffold generally improved the response of osteoblast in-vitro. This behavior could be explained by surface roughness and hydrophilicity.
Design and fabrication of the low conversion loss Self Oscillating Mixer for Q-band
Sang-Jin Lee,Dan An,Mun-Kyo Lee,Jin-Man Jin,Du-Hyun Ko,Chang-Sik Cho,Seong-Dae Lee,Tae-Jong Baek,Seong-Chan Kim,Hyung-Moo Park,Jin-Koo Rhee 대한전자공학회 2005 ITC-CSCC :International Technical Conference on Ci Vol.2005 No.1
흰쥐 재생간의 Glutathione S-Transferase 및 Glutathione Reductase의 활성치
이숙형,문교철,김여희,곽춘식 啓明大學校 醫科大學 1989 계명의대학술지 Vol.8 No.1
Changes in the activities of the following enzymes have been studied over a period of ten days after 70% (median and left lateral loves) partial hepatectomy in rats: cytosolic, mitochondrial and microsomal glutathione S-transferase, cytosolic glutathione reductase and cvtosolic glutathione peroxidase of regenerating liver. The activity of cytosolic glutathione S-transferase in the regenerating rat liver significantly diminished between the second and sixth days after the partial hepatectomy and that of mitochondrial glutathione S-transferase slightly decreased between the second and the thrid days after operation. However, the microsomal glutathion S-transferase activity in the regenerating rat liver showed a slight increase between the thrid and sixth days after operation. The cytosolic glutathione reductase activity in the regenerating rat liver slightly decreased between the first and thrid days after operation and the cytosolic glutathione peroxidase activity in the regenerating rat liver had a significant diminution between the second and the tenth days after the partial hepatectomy.