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정석훈,서헌덕,박범영,박재홍,박성민,정문기,정해도,김형재,Jeong, Sukhoon,Seo, Heondeok,Park, Boumyoung,Park, Jaehong,Park, Seungmin,Jeong, Moonki,Jeong, Haedo,Kim, Hyoungjae 한국전기전자재료학회 2005 전기전자재료학회논문지 Vol.18 No.9
This study introduces Electro-chemical Mechanical Deposition(ECMD) lot making Cu interconnect. ECMD is a novel technique that has ability to deposit planar conductive films on non-planar substrate surfaces. Technique involves electrochemical deposition(ECD) and mechanical sweeping of the substrate surface Preferential deposition into the cavities on the substrate surface nay be achieved through two difference mechanisms. The first mechanism is more chemical and essential. It involves enhancing deposition into the cavities where mechanical sweeping does not reach. The second mechanism involves reducing deposition onto surface that is swept. In this study, we demonstrate ECMD process and characteristic. We proceeded this experiment by changing of distribution of current density on divided water area zones and use different pad types.
조경훈,Jeong Myung Ho,Park Dae Sung,Kim Moonki,Kim JungHa,Park Jun-Kyu,Han Xiongyi,Hyun Dae Young,Kim Min Chul,Sim Doo Sun,Hong Young Joon,Kim Ju Han,Ahn Youngkeun 대한의학회 2021 Journal of Korean medical science Vol.36 No.40
Background: Titanium dioxide films exhibit good biocompatibility and may be effective as drug-binding matrices for drug-eluting stents. We conducted a mid-term evaluation of a novel polymer-free everolimus-eluting stent using nitrogen-doped titanium dioxide film deposition (TIGEREVOLUTION®) in comparison with a commercial durable polymer everolimus-eluting stent (XIENCE Alpine®) in a porcine coronary restenosis model. Methods: Twenty-eight coronary arteries from 14 mini-pigs were randomly allocated to TIGEREVOLUTION® stent and XIENCE Alpine® stent groups. The stents were implanted in the coronary artery at a 1.1–1.2:1 stent-to-artery ratio. Eleven stented coronary arteries in each group were finally analyzed using coronary angiography, optical coherence tomography, and histopathologic evaluation 6 months after stenting. Results: Quantitative coronary analysis showed no significant differences in the preprocedural, post-procedural, and 6-month lumen diameters between the groups. In the volumetric analysis of optical coherence tomography at 6 months, no significant differences were observed in stent volume, lumen volume, and percent area stenosis between the groups. There were no significant differences in injury score, inflammation score, or fibrin score between the groups, although the fibrin score was zero in the TIGEREVOLUTION® stent group (0 vs. 0.07 ± 0.11, P = 0.180). Conclusion: Preclinical evaluation, including optical coherence tomographic findings 6 months after stenting, demonstrated that the TIGEREVOLUTION® stent exhibited efficacy and safety comparable with the XIENCE Alpine® stent, supporting the need for further clinical studies on the TIGEREVOLUTION® stent.
Regulation of Beige Adipogenesis and Thermogenesis by Fatty Acid-derived Natural Substance
Suyeon YUN,In Soo PYO,Mi-Young JEONG,Moonki CHAE,Sung-Joon LEE 한국생물공학회 2021 한국생물공학회 학술대회 Vol.2021 No.10
Beige adipose tissues regulate energy homeostasis and body temperature with induction of thermogenesis. Molecular mechanisms of beiging process are not completely understood. We investigated whether fatty acid-derived natural substance, compound A, could affect beige adipogenesis and thermogenesis. The compound A, a ligand of G-protein coupled receptor K (GPCR-K), significantly activated GPCR-K signaling pathways and stimulated beige adipogenesis. Mice orally administered with compound A for 2-week showed increased beiging of subcutaneous white adipose tissues with elevated rectal temperature during cold temperature exposure. The mass of subcutaneous white adipose tissues was significantly reduced while that of brown adipose tissue was increased in mice fed with compound A. The expression levels of thermogenic genes including Ucp1 were significantly increased. The detailed mechanisms of induction of beiging process by compound A will be investigated further.
Lee, Sungcheul,Kim, Sitae,In, Woosung,Kim, Moonki,Jeong, Jay I.,Kim, Jongwon Cambridge University Press 2011 Robotica Vol.29 No.4
<B>SUMMARY</B><P>In this paper, an experimental verification of antagonistic stiffness planning is presented for a 2-DOF parallel mechanism with four actuators. With 2-DOF force redundancy, the magnitude and direction of the stiffness enhancement can be controlled by the additional actuators, where the internal torques of the mechanism exist on the two-dimensional null space. In the experiments, the passive and active stiffness are measured, respectively, during endowing the external force at the end-effector. Two stiffness assignment methods for a given pathway are suggested and are verified by the experiments.</P>
Consumable Approaches of Polysilicon MEMS CMP
Sungmin Park,박범영,정해도,김형재,Sukhoon Jeong,Moonki Jeong 한국전기전자재료학회 2006 Transactions on Electrical and Electronic Material Vol.7 No.4
Chemical-mechanical polishing (CMP), one of the dominant technology for ULSI planarization, is used to flatten the micro electro-mechanical systems (MEMS) structures. The objective of this paper is to achieve good planarization of the deposited film and to improve deposition efficiency of subsequent layer structures by using surface-micromachining process in MEMS technology. Planarization characteristic of poly-Si film deposited on thin oxide layer with MEMS structures is evaluated with different slurries. Patterns used for this research have shapes of square, density, line, hole, pillar, and micro engine part. Advantages of CMP process for MEMS structures are observed respectively by using the test patterns with structures larger than 1um line width. Preliminary tests for material selectivity of poly-Si and oxide are conducted with two types of silica slurries: ILD1300TM and Nalco2371TM. And then, the experiments were conducted based on the pretest. A selectivity and pH adjustment of slurry affected largely step heights of MEMS structures. These results would be anticipated as an important bridge stone to manufacture MEMS CMP slurry.