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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>
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.
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.
Hyunah Lee,Hafiz Muhammad Shahbaz,Namho Ha,Jeong Un Kim,Sang Jun Lee,Jiyong Park 고려인삼학회 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-TiO₂ 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.
기업용 S/W 판매전략 공유를 위한 인지지도 기반의 암묵지 관리 접근법
정남호(Namho Chung),이남호(Namho Lee),이건창(Kun Chang Lee) 한국경영과학회 2007 韓國經營科學會誌 Vol.32 No.4
Dramatic development of information technology requires new type of sales strategy to enterprise S/W dealers. That is, one should thoroughly consider diversified types of enterprise S/W and more elaborated consumer needs to establish successful sales strategy. However, various factors that should be considered in establishing enterprise S/W sales strategy are different according to types of enterprise S/W and hard to be managed systematically which led to the current situation where they have not been discussed enough. Therefore, this study introduced the relationship between the factors that affect selection of enterprise S/W using the concept of cognitive map on various enterprise S/W sales cases. Through this process, this study grouped the cognitive maps of similar cases to introduce their characteristics and made this result to be practically useful to enterprise S/W sales strategy.
유전자 알고리즘을 이용한 퍼지인식도 생성 메커니즘의 의사결정 효과성에 관한 실증연구
정남호(Namho Chung),이남호(Namho Lee),이건창(Kun Chang Lee) 한국경영과학회 2007 經營 科學 Vol.24 No.2
Fuzzy cognitive map (FCM) has long been used as an effective way of constructing the human's decision making process explicitly. By taking advantage of this feature, FCM has been extensively used in providing what-if solutions to a wide variety of business decision making problems. In contrast, the goal-seeking analysis mechanism by using the FCM is rarely observed in literature, which remains a research void in the fields of FCM. In this sense, this study proposes a new type of the FCM-based goal-seeking analysis which is based on utilizing the genetic algorithm. Its main recipe lies in the fact that the what-if analysis as well as goal-seeking analysis are enabled very effectively by incorporating the genetic algorithm into the FCM-driven inference process. To prove the empirical validity of the proposed approach, valid questionnaires were gathered from a number of experts on software sales, and analyzed statistically. Results showed that the proposed approach is robust and significant.