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Lee, Minwoong,Cho, Seongik,Lee, Namho,Kim, Jongyeol Elsevier 2018 MICROELECTRONIC ENGINEERING Vol.200 No.-
<P><B>Abstract</B></P> <P>The n-type metal-oxide-semiconductor field-effect transistor (n-MOSFET) produced in the widely used CMOS bulk process takes radiation damage by the total ionizing dose (TID) effects in radiation environments, so the radiation-tolerant properties of semiconductor integrated-circuits (ICs) used in high-radiation environments is a critical issue. The formation method of the isolation oxide module (IOM), which induces the radiation-induced leakage currents, differs depending on the chip density of the CMOS bulk process. In this paper, we designed and fabricated I-gate n-MOSFETs for bulk process and analyzed the radiation-tolerant characteristics according to IOM. The I-gate n-MOSFET chips are fabricated using the shallow trench isolation (STI) 0.18um and local oxidation of silicon (LOCOS) 0.35um processes of the CMOS bulk process. Tests and evaluation of the TID effects on the chips are carried out by irradiating a total cumulative dose up to 2 Mrad(Si). As the results, in the standard n-MOSFET, the leakage currents of the LOCOS and STI processes are 27.7uA and 16.4uA, and in I-gate n-MOSEFT, are 1.1uA and 0.7uA. The leakage currents of standard n-MOSFET increased by about 25 times before and after irradiation, but the electric characteristics of I-gate n-MOSFET is maintained regardless of the process. Therefore, the process versatility of the I-gate n-MOSFET with the radiation-tolerant performance has been verified.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Radiation-induced TID effects that forms the leakage current of the electronic device. </LI> <LI> Implementation of n-MOSFET with I-gate structure to block leakage current. </LI> <LI> Verification of radiation-tolerance characteristics in LOCOS and STI process through TID effect test. </LI> <LI> Process versatility for designing radiation integrated circuits. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Lee, Hyunah,Shahbaz, Hafiz Muhammad,Ha, Namho,Kim, Jeong Un,Lee, Sang Jun,Park, Jiyong The Korean Society of Ginseng 2020 Journal of Ginseng Research Vol.44 No.1
Background: Korean ginseng (Panax ginseng Meyer) powder is in rising demand because powder forms of foods are convenient to handle and are highly preservable. However, ginseng powder (GP) manufactured using the conventional process of air drying and dry milling suffers nutrient destruction and a lack of microbiological safety. The objective of this study was to prepare GP using a novel process comprised of UV-TiO<sub>2</sub> photocatalysis (UVTP) as a prewashing step, wet grinding, high hydrostatic pressure (HHP), and freeze-drying treatments. Methods: The effects of UVTP and HHP treatments on the microbial population, ginsenoside concentration, and physiological characteristics of GP were evaluated. Results: When UVTP for 10 min and HHP at 600 MPa for 5 min were combined, initial 4.95 log CFU/g-fw counts of total aerobes in fresh ginseng were reduced to lower than the detection limit. The levels of 7 major ginsenosides in UVTP-HHP-treated GP were significantly higher than in untreated control samples. Stronger inhibitory effects against inflammatory mediator production and antioxidant activity were observed in UVTP-HHP-treated GP than in untreated samples. There were also no significant differences in CIELAB color values of UVTP-HHP-treated GP compared with untreated control samples. Conclusion: Combined processing of UVTP and HHP increased ginsenoside levels and enhanced the microbiological safety and physiological activity of GP.
Microscopic Stereo Camera with Simultaneous Vergence and Focus Control
Namho Lee,Jaekyoung Moon,Soon-Yong Park 대한전자공학회 2008 ITC-CSCC :International Technical Conference on Ci Vol.2008 No.7
This paper introduces a stereoscopic stereo camera which equipped with two microscopic video sensors, a micro motor, and a linear stage. Mechanism of simultaneously controlling both vergence and focus of the camera is presented. Parallel-axis design of two video sensors enables the stereo camera to converge and focus on an interesting object simultaneously. Calibration of the camera is done to reconstruct 3D models of real objects using the camera. Experimental results show that the vergence and focus of the camera change with respect to the motion of an object.
3DTV Broadcasting and Distribution Systems
Hur, Namho,Hyun Lee,Gwang Soon Lee,Sang Jin Lee,Gotchev, A,Sang-Il Park IEEE 2011 IEEE transactions on broadcasting Vol.57 No.2
<P>In this paper, the authors present three-dimensional television (3DTV) broadcasting and distribution systems that are employed to deliver a pair of stereoscopic images to mobile users, as well as users at home. First, mobile 3DTV systems and services based on DMB and DVB-H are respectively introduced. Second, fixed and high-definition 3DTV systems and services based on terrestrial digital broadcasting are described along with an introduction of experimental 3DTV services in Korea. To be specific, the authors summarize 3DTV systems from the viewpoints of target services, system and user requirements, system configurations, broadcasting trials, related standards, and technical challenges.</P>
연료 특성이 가솔린 직분사식 멀티홀 인젝터의 분무 특성에 미치는 영향에 대한 연구
김남호(Namho Kim),이준용(Junyong Lee),이경현(Kyeongheyon Lee),민경덕(Kyoungdoug Min) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
Higher specific power and thermal efficiency of DISI system compared to those of MPI system has led to wide adoption of DISI system for SI engines. Since DISI system injects fuel directly into the cylinder, wall wetting may occur and it must be prevented to reduce HC emission. In order to prevent wall wetting, spray characteristics of multi-hole injector must be studied more carefully. Previous studies have focused on the measurement of multi-hole injector performance using single fuel but only a few studies have been done on the multi-hole injector performance using a variety of fuels Although gasoline sold in other countries have similar components, they have different properties such as volatility. It is reported that the use of low volatility gasoline leads to increase in HC emission. Therefore, in this study, the effect of fuel properties on the spray penetration length and spray width was studied by injecting various fuels at the various injection pressure and ambient pressure, and taking images of fuel injection using high speed CCD camera. The obtained images were analyzed by the image processing code and spray penetration length and spray area of various fuels were compared.