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Jun‑Hyung Sim,Yungeun Ha,Min‑Kyun Kim,Min‑Joong Kim,Young‑Rae Cho 대한금속·재료학회 2022 METALS AND MATERIALS International Vol.28 No.2
Bonding properties are important for metallic multilayer composites (MMCs) comprising different materials or materialswith different mechanical properties. In this study, we fabricated 2-ply Al/stainless steel (STS) clad metals and Al/adhesive(adh)/STS joints. To manufacture samples with various mechanical properties, T6 heat treatment was performed on cladmetals, and adhesive joints of several thicknesses were prepared. For each sample, the bonding strength was characterizedvia a T-peel test and the results were analyzed using the peeling angle. For 2-ply Al/STS clad metals, the T6 heat treatmentresulted in opposite trends in the mechanical properties. The bonding strength of 2-ply Al/STS clad metals was affectedby the peeling angle, i.e., a small peeling angle provided a small bonding strength at the interface. However, for the 2-plyAl/adh/STS joints, the bonding strength of adhesives on metals depended on each adherend of the stress state. As the differencein mechanical properties between the two adherends increased, the difference in each peeling angle of Al and STSalso increased. The peeling angle of adherends reached a limiting value when the sample contacted the clamping jig head;therefore, a new term, apparent bonding strength (ABS), is necessary to differentiate this new strength from the bondingstrength obtained under non-contact conditions. We believe that the concept of peeling angle and ABS proposed herein willplay a crucial role in describing the delamination behavior and bonding strength of MMCs via the peel test.
Hyung-Joon Chi,Young-Ho Choi,Soo-Min Lee,Jae-Yoon Sim,Hong-June Park,Jong-Jin Lim,Pil-Sung Kang,Bu-Yeol Lee,Jin-Cheol Hong,Hee-Sub Lee IEEE 2011 IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS PART 2 E Vol.58 No.10
<P>A 2-Gb/s point-to-point intrapanel interface for thin-film-transistor liquid crystal display (TFT-LCD) is proposed by using only clock and data lines. Extra control lines are eliminated by sending the VSYNC code through the clock line at the start of the VBLANK time period and by sending the control commands through the data line at the end of the VBLANK time period. To reduce electromagnetic interference, the slew rate of the clock driver is reduced, and the frequency of clock signals is set to the subpixel (R/G/B) frequency (1/10 of the data rate). The clock line is cascaded between two adjacent receiver (RX) chips for a point-to-point interface. To generate an internal clock synchronized (deskewed) to the subpixel (R/G/B) boundary of incoming data at each RX, a single all-digital delay-locked loop (DLL) circuit is proposed to perform the combined operation of a DLL and a phase interpolator. This deskew operation is performed during the VBLANK period with periodic preamble data input (`1111100000'). At the RX, a multiphase DLL follows the deskew DLL to generate 20-phase clocks for data sampling. 2-Gb/s data are transmitted through a series connection of a 100-cm-long flat flexible cable and a 50-cm-long FR4 microstrip line with a bit error rate less than 1e-12. The image test was successfully performed with a 42-in full-high definition 120-Hz LCD panel at 1.5 Gbps. The area and power consumption of RX chip is 0.35 mm<SUP>2</SUP> and 52.4 mW at 2 Gbps with a 0.18- μm complementary metal-oxide-semiconductor process and a 1.8-V supply.</P>
심형준,김승희,도기승,장민수,서기석,김상태 대한피부과학회 2004 대한피부과학회지 Vol.42 No.1
Amyloidosis is a disorder of protein metabolism characterized by the extracellular deposition of abnormal protein fibrils. We report a case of macular amyloidosis due to nylon towel on his back. A 61-year-old male presented with asymptomatic hyperpigmented macules on the scapulae for 6 years. He had a habit of scrubbing his back for many years with a rough nylon towel while taking a bath. The histologic examination revealed liquefaction degeneration and homogenous eosinophilic deposition in the papillary dermis. In Congo red, amyloid material stained positively and in anti-keratin antibody staining. He had neither clinical nor laboratory evidence of systemic amyloidosis. A diagnosis of friction amyloidosis was made on histological and immunohistopathological findings. (Korean J Dermatol 2004;42(1):119~121)
Min Chul Kim,Jae Yeong Cho,Hae Chang Jeong,Ki Hong Lee,,Keun Ho Park,Doo Sun Sim,Nam Sik Yoon,Hyun Joo Youn,Kye Hun Kim,Young Joon Hong,Hyung Wook Park,Ju Han Kim,Myung Ho Jeong,Jeong Gwan Cho,Jong Ch 대한심장학회 2016 Korean Circulation Journal Vol.46 No.4
Background and Objectives: There is limited information on the transient or persistent no reflow phenomenon in patients with acute myocardial infarction (AMI) undergoing percutaneous coronary intervention (PCI). Subjects and Methods: The study analyzed 4329 patients with AMI from a Korean multicenter registry who underwent PCI using coronary stents (2668 ST-elevation and 1661 non-ST-elevation myocardial infarction [MI] patients): 4071 patients without any no reflow, 213 with transient no reflow (no reflow with final thrombolysis in myocardial infarction [TIMI] flow grade 3), and 45 with persistent no reflow (no reflow with final TIMI flow grade≤2). The primary endpoint was all-cause mortality during 3-year follow-up. We also analyzed the incidence of cardiac mortality, non-fatal MI, re-hospitalization due to heart failure, target vessel revascularization, and stent thrombosis. Results: The persistent no reflow group was associated with higher all-cause mortality (hazard ratio [HR] 1.98, 95% confidence interval [CI] 1.08-3.65, p=0.028) and cardiac mortality (HR 3.28, 95% CI 1.54-6.95, p=0.002) compared with the normal reflow group. Transient no reflow increased all-cause mortality only when compared with normal reflow group (HR 1.58, 95% CI 1.11-2.24, p=0.010). When comparing transient and persistent no reflow, persistent no reflow was associated with increased all-cause mortality (46.7 vs. 24.4%, log rank p=0.033). Conclusion: The persistent no reflow phenomenon was associated with a poor in-hospital outcome and increased long-term mortality mainly driven by increased cardiac mortality compared to the transient no reflow phenomenon or normal reflow.
A simple guide to the structural study on membrane proteins in detergents using solution NMR
Sim, Dae-Won,Lee, Yoo-sup,Seo, Min-Duk,Won, Hyung-Sik,Kim, Ji-hun Korean Magnetic Resonance Society 2015 Journal of the Korean Magnetic Resonance Society Vol.19 No.3
NMR-based structural studies on membrane proteins are appreciated quite challenging due to various reasons, generally including the narrow dispersion of NMR spectra, the severe peak broadening, and the lack of long range NOEs. In spite of the poor biophysical properties, structural studies on membrane proteins have got to go on, considering their functional importance in biological systems. In this review, we provide a simple overview of the techniques generally used in structural studies of membrane proteins by solution NMR, with experimental examples of a helical membrane protein, caveolin 3. Detergent screening is usually employed as the first step and the selection of appropriate detergent is the most important for successful approach to membrane proteins. Various tools can then be applied as specialized NMR techniques in solution that include sample deteuration, amino-acid selective isotope labeling, residual dipolar coupling, and paramagnetic relaxation enhancement.
Min Chul Kim,Youngkeun Ahn,Jae Yeong Cho,Ki Hong Lee,Doo Sun Sim,Nam Sik Yoon,Hyun Ju Yoon,Kye Hun Kim,Young Joon Hong,Hyung Wook Park,Ju Han Kim,Myung Ho Jeong,Jeong Gwan Cho,Jong Chun Park,Kiyuk Cha 대한심장학회 2019 Korean Circulation Journal Vol.49 No.5
Background and Objectives: Although current guidelines recommend early initiation of statin in patients with acute myocardial infarction (AMI), there is no consensus for optimal timing of statin initiation. Methods: A total of 3,921 statin-naïve patients undergoing percutaneous coronary intervention were analyzed, and divided into 3 groups according to statin initiation time: group 1 (statin initiation <24 hours after admission), group 2 (24–48 hours) and group 3 (≥48 hours). We also made 3 stratified models to reduce bias: model 1 (<24 hours vs. ≥24 hours), model 2 (<48 hours vs. ≥48 hours) and model 3 (<24 hours vs. 24–48 hours). The endpoint was major adverse cardiac events (MACE; composite of cardiac death, myocardial infarction and target-vessel revascularization) during median 3.8 years. Results: During follow-up, incidence of MACE was lower in early statin group in both model 1 (14.3% vs. 18.4%, hazard ratio [HR], 0.77; 95% confidence interval [CI], 0.66–0.91; p=0.002) and model 2 (14.6% vs. 19.7%, HR, 0.81; 95% CI, 0.67–0.97; p=0.022). After propensity-score matching, results remained unaltered. Statin initiation <24 hours reduced MACE compared to statin initiation ≥24 hours in model 1. Statin initiation <48 hours also reduced MACE compared to statin initiation later in model 2. However, there was no difference in incidence of MACE between statin initiation <24 hours and 24–48 hours) in model 3. Conclusions: Early statin therapy within 48 hours after admission in statin-naïve patients with AMI reduced long-term clinical outcomes compared with statin initiation later.
침염시킨 철기 유물 표면 위에 형성된 부식 생성물과 탈염처리에 대한 연구
민심근(Sim-Kun Min),이재형(Jae Hyung Lee),이재봉(Jae-Bong Lee),안병찬(Byeong-Chan An) 한국표면공학회 2007 한국표면공학회지 Vol.40 No.1
Excavated archaeological iron artifacts are usually conducted the conservation treatment for removal of chloride ions in the corrosion products. However, some iron artifacts are corroded again even after the conservation treatment due to unremoved chloride ions. Therefore, it is important to prevent desalinized artifacts from the occurrence of corrosion after the treatment. In this paper, we investigated the characteristics of corrosion products on salinized iron artifacts and evaluated the variety of desalination methods such as autoclave, intensive washing and NaOH. It was also found that β-FeOOH (Akaganeite) played an important role on the occurrence of corrosion and the treatment for removal of chloride ions. The extents of desalination were compared between the desalination methods. Results showed that the auto-clave method represented the highest efficiency for desalination while the intensive washing method was the lowest.