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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.
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.
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.
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
Activities of Antioxidant Enzymes in Neutrophils from Patients with Diabetes Mellitus
Lee, Hung Gwan,Mun, Kyo Cheol 啓明大學校 醫科大學 2002 계명의대학술지 Vol.21 No.1
To know the mechanism of impaired bactericidal function, especially impaired hydrogen peroxide production, in neutrophils from patients with diabetes mellitus. the activities of antioxidant enzymes such as superoxide dismutase, catalase, and glutathione peroxidase were determined in neutrophils from 12 patients with diabetes mellitus. Catalase activity in the neutrophils from the patients with diabetes mellitus were higher than that from healthy controls (P<0.05). Glutathione peroxidase activity in the neutrophils was higher without significance. Superoxide dismutase activity in the neutrophils was lower without significance. These results suggest that the production of hydrogen peroxide exerting a direct germicidal ability is impaired in patients with diabetes mellitus due to the decrease in dismutation of superoxide radicals by superoxide dismutase and the increase in dismutation of hydrogen peroxide by catalase and glutathione peroxidase, and these alterations might affect microbicidal activity of neutrophils in patients with diabetes mellitus.
Development of Eco-friendly Electric Transmission Towers in KEPCO
Lee, Won-kyo,Mun, Sung-Duk,Shin, Kooyong Korea Electric Power Corporation 2019 KEPCO Journal on electric power and energy Vol.5 No.3
Lattice towers and tubular steel poles have been commonly used for electrical power transmission in Korea. They are durable, structurally stable, simple and can easily be constructed in limited spaces. However, residents are opposed to construct transmission lattice towers in their areas because they are not visually attractive, and electrical field occur at the transmission lines. Underground transmissions have been used instead of the traditional towers to resolve these problems, however they are not cost effective to construct and run. Therefore, we have developed eco-friendly towers that are more attractive, well blending into the surrounding environment, and much more economical than underground transmissions. There are four categories of the eco-friendly electric transmission towers about design aspects. Firstly, there is decoration type such as tree tower and ensemble tower. Tree tower looks like actual trees with leaves and branches so it blends into surroundings. Ensemble towers were designed after pair of crane birds. Those towers have decoration features and art works. Structural examination and manufacturing this type would be very similar to the conventional transmission towers. Secondly, there is arm design type such as traditional tower. Design features are added to the existing towers. As partial design can be adoptable on these types, it can easily meet height regulations and attach to conventional lattice towers and tubular steel poles. Also, these towers are more economical than others. Third category is multipurpose type such as Sail Tower. These towers have simple pole or tubular structure with features which can be used as information message board, public relations and much more. This type will face greater wind pressure because of the area of the board, also visibility must take into consideration. Lastly, there is moulding type such as arc pylon. It is different shape to the conventional towers - lattice towers and tubular steel poles. Dramatic design changes have been adapted - from a hard and static tower to a soft and curved tower. These towers will well stand out in the field. However, structural examination and manufacturing this type would be difficult and costly. Also certain towers of this type would require scaffolding or false work to construct, which will result in limitations of the construction area. This paper shows KEPCO 154 kV Sail tower in detail. KEPCO 154 kV Sail tower that is included in fabrication of sample tower and tower testing has developed and the results are presented in this paper. We hope that sail tower is also considered as a solution to have public acceptance or to create a familiar atmosphere among towers and people in coastal area.