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Kim, Sung-Bock,Ro, Jeong-Rae,Lee, El-Hang Electronics and Telecommunications Research Instit 1998 ETRI Journal Vol.20 No.2
We report, for the first time, the fabrication of vertically stacked InGaAs/GaAs quantum wires (QWRs) on V-grooved substrates by chemical beam epitaxy (CBE). To fabricate the vertically stacked QWRs structure, we have grown the GaAs resharpening barrier layers on V-grooves with (100)-(322) facet configuration instead of (100)-(111) base at 450 $^{\circ}C$. Under the conditions of low growth temperature, the growth rate of GaAs on the (322) sidewall is higher than that at the (100) bottom. Transmission electron microscopy verifies that the vertically stacked InGaAs QWRs were formed in sizes of about $200{\AA} {\times} 500{\sim}600 {\AA}$. Three distinct photoluminescence peaks related with side-quantum wells (QWLs), top-QWLs and QWRs were observed even at 200 K due to sufficient carrier and optical confinement. These results strongly suggest the existence of the quantized state in the vertically stacked InGaAs/GaAs QWRs grown by CBE.
Kim, Chang Hoon,Bang, Seungmin,Song, Kyung Ho,Park, Jeong Youp,Jeon, Tae Joo,Hong, Sung Pil,Chung, Jae Bock,Park, Seung Woo,Song, Si Young Editorial Office of Gut and Liver 2007 Gut and Liver Vol.1 No.1
Background/Aims: Obstruction of the main pancreatic duct (MPD) has been considered one of the major causes for pain in chronic pancreatitis (CP). In this study, we evaluated the efficacy of MPD stenting in painful CP, and tried to determine a guideline for stent removal. Methods: Sixteen patients with painful CP who underwent MPD stenting were included. Follow up ERCP was performed 3 months after stenting in all patients. Stents were removed in patients who achieved pain relief, complete stone clearance, and decreased MPD diameter after 3 months. Re-sults: Before stenting, ERCP showed MPD stricture in 11 cases, MPD dilatation by stone in 1 case, concomitant stricture and stone in 4 cases. After stenting, complete pain relief was achieved in 13 patients (81.3%) and partial pain relief was achieved in 3 patient (18.7%). There was no patient whose pain was not relieved. Stents were removed in 7 patients who achieved pain relief, complete stone clearance, and decreased MPD diameter after 3 months. Decrease of MPD diameter was significantly greater in patient who could remove stent than those who could not (72.9% vs. 127.9% of initial MPD diameter, p=0.008). Conclusions: If partial or full pain relief is achieved after MPD stenting and follow up ERCP after 3 months shows decreased MPD diameter compared to the initial one, stent removal might be considered.
Kim, Sang Hoon,Nam, Onyou,Jin, EonSeon,Gu, Man Bock Elsevier 2019 Biosensors & bioelectronics Vol.123 No.-
<P><B>Abstract</B></P> <P>In this study, we report a cognate pair of the aptamer-based sandwich-type electrochemical biosensor for type 2 diabetes biomarker (Vaspin) using coccolith modified electrodeposited on the screen-printed gold electrode (CME-SPGE). The coccolith derived from E. huxleyi used in this study were known to be highly-structured microparticles with many nano-sized pores. The CME-SPGE was successfully fabricated by drop-casting coccoliths, followed by Au sputtering and electrodeposition of Au. On this CME-SPGE electrode, the sandwich-type electrochemical aptasensor was fabricated by using a cognate pair of aptamers. The morphological, electrochemical characteristics and the performances of both the CME-SPGE and the completely fabricated sandwich-type aptasensor were investigated by SEM, EDAX, cyclic voltammetry, and chronoamperometry. Due to the synergic effect of a cognate pair of aptamers on CME-SPGE, this newly developed sandwich-type electrochemical biosensor for Vaspin showed high specificity, and good sensitivity with a limit of detection (LOD) of 298 pM, along with more widen the linear range. To the best of our knowledge, this is the first report about the use of a coccolith modified electrode with a cognate pair aptamer resulting in sandwich-type binding in an electrochemical biosensor. With the advantages of using highly-structured biomineral microparticles and a cognate pair of aptamers, this new study may pave the innovative way to design a novel sandwich-type electrochemical aptasensor platform.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The original SPGE surface was successfully modified uniformly with the highly-structured coccolith microparticles. </LI> <LI> A cognate pair of aptamers was applied to fabricate sandwich-type electrochemical aptasensor successfully. </LI> <LI> This newly developed sandwich-type electrochemical biosensor was highly sensitive to type 2 diabetes biomarker, Vaspin. </LI> </UL> </P>
Fabrication Process for a High Strength 9Cr-2W Steel Sheet
Kim, Tae Kyu,Han, Chang Hee,Kim, Sung Ho,Lee, Chan Bock Trans Tech Publications, Ltd. 2010 Materials science forum Vol.638 No.-
<P>This study deals with the fabrication of high strength ferritic/martensitic steels by a control of both the carbon concentration and the fabrication process parameters. The 9Cr-2W steels containing a carbon concentration of 0.05, 0.07 and 0.11 wt% were normalized at 1050oC for 1 h, followed by a tempering at 550 and 750oC for 2 h, respectively. The results of the tensile tests at room temperature indicated that the tensile strengths were increased with an increase of the carbon concentration from 0.05 wt% to 0.07 wt%, but no more increase was observed when the carbon concentration was increased further up to 0.11%. After a cold rolling from a 4 mm to a 1 mm thickness without/with an intermediate heat treatment and a final heat treatment, the results of the tensile tests exhibited that superior tensile properties were obtained when the fabrication processes were composed of a tempering at 550oC, and a cold rolling with several intermediate heat treatments. These results could be attributed to the finely distributed precipitates in the partially recrystallized matrix. The optimized carbon concentration and the controlled fabrication process parameters are thus suggested to fabricate a high strength 9Cr-2W steel sheet. </P>