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Effect of Pore Size on the High Temperature Oxidation of Ni-Fe-Cr-Al Porous Metal
Sung-Hwan Choi,Song-Yi Kim,Jung-Yeul Yun,Byoung-Kee Kim,이기안,공영민 대한금속·재료학회 2011 METALS AND MATERIALS International Vol.17 No.2
This study investigated the effect of the pore size of Ni-22.4%Fe-22%Cr-6%Al porous metal on its hightemperature oxidation. Two types of open porous metals with pore sizes of 800 μm and 580 μm were used. A 24-hour isothermal oxidation test was conducted at three different temperatures of 900 °C, 1000 °C, and 1100 °C under a 79% N_2 + 21% O2 atmosphere. The results of the BET analysis revealed that the specific surface area increased as the pore size decreased from 800 μm to 580 μm. The high- temperature oxidation results showed that porous metals exhibited far lower levels of oxidation resistance compared with bulk metals,and that the oxidation resistance of porous metals decreased with a decreasing pore size. According to the microstructural observations of the oxide layers, the 900 °C and 1000 °C oxidation layer contained Ni, Cr,and Al oxides mainly on the strut. The 800 μm porous metal strut exhibited similar oxidation behavior at 1100 °C to that found at lower temperatures. In contrast, the 580 μm porous metal strut was found to consist of Ni and Fe oxides in the upper layer and Ni, Cr, and Al oxides in the lower layer, representing a low oxidation resistance. For powders affixed to the strut inside the porous metal, a different oxide-forming behavior from that of the strut was observed. In addition, the Ni-Fe-Cr-Al porous metal high- temperature oxidation microscopic mechanism is also discussed.
Yun, Seok Joong,Min, Byung-Dal,Kang, Ho-Won,Shin, Kyung-Sub,Kim, Tae-Hwan,Kim, Won-Tae,Lee, Sang Cheol,Kim, Wun-Jae The Korean Academy of Medical Sciences 2012 JOURNAL OF KOREAN MEDICAL SCIENCE Vol.27 No.9
<P>The study was designed to investigate the effect of serum glucose, insulin and insulin resistance on the risk of prostate cancer (CaP) and on the clinicopathological characteristics in Korean men. Subjects were retrospectively recruited from 166 CaP patients underwent radical prostatectomy and 166 age-matched benign prostatic hyperplasia (BPH) patients. The serum was taken on the morning of the day of operation and insulin resistance was assessed by homeostasis model assessment insulin resistance index (HOMA-IR). Men in highest tertile of insulin was associated with 55% reduced odds of CaP than those with the lowest tertile (OR = 0.45, 95% CI = 0.23-0.89, <I>P</I> = 0.022). The patients in highest tertile of insulin had a more than 5.6 fold risk of locally advanced stage than those in the lowest tertile (OR = 5.62, 95% CI = 1.88-16.83, <I>P</I> = 0.002). Moreover, the patients in the highest tertile HOMA-IR group was associated with an increased risk of locally advanced stage than the lowest tertile group (OR = 3.10, 95% CI = 1.07-8.99, <I>P</I> = 0.037). These results suggest that elevated insulin and insulin resistance are associated with the advanced pathological stage of prostate cancer in Korean patients.</P>
Comparison of Knee Extensor and Hip Extensor Strength According to Wall Squat Performance
Sung-hoon Jung,Moon-hwan Kim,Ui-jae Hwang,Jun-hee Kim,Oh-yun Kwon 한국전문물리치료학회 2017 한국전문물리치료학회지 Vol.24 No.1
Background: The wall squat is considered an effective exercise because it can reduce the knee load and prevent excessive lumbar movement. However, the relationship between wall squat performance and strength of knee extensors and hip extensors remained unclear. Objects: The purpose of this study was to compare the strengths of the knee extensors and hip extensors between groups with low and high wall squat performance. Method: Nineteen males (low performance group: 9 subjects, high performance group: 10 subjects) participated in this study and performed wall squats. The subjects who were performing less than 30% of the average wall squat count were classified into the low wall squat performance group (less than or equal to 4 times) and the subjects who performed more than 30% of the average wall squat count were classified into the high wall squat performance group (greater than or equal to 8 times). Knee extensor and hip extensor strength were measured with a strength measurement system. An independent t-test was used to compare the strengths of the knee extensors and hip extensors between the groups with low and high wall squat performance. Results: The ratios of knee extensor and hip extensor strength to bodyweight were greater in the high wall squat performance group than in the low wall squat performance group (knee extensors: p<.001; hip extensors: p=.03). In the high- and low-performance groups, the ratios of knee extensor strength to bodyweight were 42.74±5.72 and 30.76±8.54, respectively, and the ratios of hip extensor strength to bodyweight were 31.95±10.61 and 20.66±11.25, respectively. Conclusion: Our findings suggest that knee extensor and hip extensor strength are needed for high wall squat performance. Thus, exercise to increase the knee and hip extensors strength can be recommended to improve squat performance.
( Sung Hwan Lee ),( Ho Kyoung Hwang ),( Woo Jung Lee ),( Mijin Yun ),( Chang Moo Kang ) 대한소화기기능성질환·운동학회(구 대한소화관운동학회) 2019 Gut and Liver Vol.13 No.3
Background/Aims: <sup>18</sup>F-fluorodeoxyglucose-positron emission tomography (<sup>18</sup>F-FDG-PET) reflects biological aggressiveness and predicts prognoses in various tumors. Evaluating the oncologic significance of the preoperative metabolic phenotype might be necessary for planning the surgical strategy in resectable pancreatic cancers. Methods: From January 2010 to December 2015, a total of 93 patients with pathologic T3 (pT3) pancreatic cancer were included in this study. Clinicopathological parameters and PET parameters were evaluated, and transcriptome-wide analysis was performed to identify the oncologic impact and molecular landscape of the metabolic phenotype of resectable pancreatic cancers. Results: Preoperative metabolic tumor volume (MTV)<sub>2.5</sub> was significantly higher in the pN1 group compared to the pN0 group (11.1±11.2 vs 6.5±7.8, p=0.031). Higher MTV<sub>2.5</sub> values (MTV<sub>2.5</sub> ≥4.5) were associated with multiple lymph node metastasis (p=0.003), and the lymph node ratio was also significantly higher in resected pT3 pancreatic cancer with MTV<sub>2.5</sub> ≥4.5 compared to those with MTV<sub>2.5</sub> <4.5 (0.12±0.13 vs 0.05±0.08, p=0.001). Disease-specific survival of patients with MTV<sub>2.5</sub> <4.5 was better than that of patients with MTV<sub>2.5</sub> ≥4.5 (mean, 28.8 months; 95% confidence interval [CI], 40.1 to 57.0 vs mean, 32.6 months; 95% CI, 25.5 to 39.7; p=0.026). Patients with MTV<sub>2.5</sub> ≥4.5 who received postoperative adjuvant chemotherapy showed better survival outcomes than patients with MTV<sub>2.5</sub> ≥4.5 who did not receive adjuvant treatment in resected pT3 pancreatic cancers (p<0.001). Transcriptome-wide analysis revealed that tumors with MTV<sub>2.5</sub> ≥4.5 demonstrated significantly different expression of cancer-related genes reflecting aggressive tumor biology. Conclusions: Resectable pancreatic cancer with high MTV<sub>2.5</sub> is not only associated with lymph node metastasis but also early systemic metastasis. The molecular background of resectable pancreatic cancer with high MTV<sub>2.5</sub> may be associated with aggressive biologic behavior, which might need to be considered when managing resectable pancreatic cancers. Further study is mandatory. (Gut Liver 2019;13:356-365)
Frozen Section During Medical Thoracoscopy for the Diagnosis of Tuberculous Pleurisy
( Yun Seok Kim ),( Jick Hwan Ha ),( Hyung Woo Kim ),( Yu Jin Hong ),( Joon Young Choi ),( Kyung Hoon Kim ),( Ah Young Shin ),( Ju Sang Kim ),( Joong Hyun Ahn ),( Yoo Jung Lee ) 대한결핵 및 호흡기학회 2023 대한결핵 및 호흡기학회 추계학술대회 초록집 Vol.136 No.0
Yun, Jungheum,Park, Yeon Hyun,Bae, Tae-Sung,Lee, Sunghun,Lee, Gun-Hwan American Chemical Society 2013 ACS APPLIED MATERIALS & INTERFACES Vol.5 No.1
<P>We report the fabrication of a highly flexible indium tin oxide (ITO) electrode that is completely transparent to light in the visible spectrum. The electrode was fabricated via the formation of a novel ITO nanoarray structure, consisting of discrete globular ITO nanoparticles superimposed on an agglomerated ITO layer, on a heat-sensitive polymer substrate. The ITO nanoarray spontaneously assembled on the surface of the polymer substrate by a simple sputter coating at room temperature, without nanolithographic or solution-based assembly processes being required. The ITO nanoarray exhibited a resistivity of approximately 2.3 × 10<SUP>–3</SUP> Ω cm and a specular transmission of about 99% at 550 nm, surpassing all previously reported values of these parameters in the case of transparent porous ITO electrodes synthesized via solution-based processes at elevated temperatures. This novel nanoarray structure and its fabrication methodology can be used for coating large-area transparent electrodes on heat-sensitive polymer substrates, a goal unrealizable through currently available solution-based fabrication methods.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/aamick/2013/aamick.2013.5.issue-1/am302341p/production/images/medium/am-2012-02341p_0009.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/am302341p'>ACS Electronic Supporting Info</A></P>
( Yun Nah Lee ),( Young Seok Kim ),( Sang Gyune Kim ),( Jae Pil Han ),( Sae Hwan Lee ),( Soung Won Jeong ),( Jae Young Jang ),( Hong Soo Kim ),( Boo Sung Kim ) 대한간학회 2012 춘·추계 학술대회 (KASL) Vol.2012 No.-
Background: Clinical usefulness of noninvasive diagnostic methods for the evaluation of liver fibrosis was not fully documented. We evaluated the accuracy of the FibroScan®, acoustic radiation force impulse (ARFI) and real time elastography (RTE) and the efficacy of the addition of the platelet and P2MS to the elastography for predicting liver fibrosis in nonalcoholic liver disease (NALD). Methods: FibroScan®, ARFI and RTE were performed simultaneously at the same day of liver biopsy in 70 patients with various NALD from October 2010 to March 2011. ARFI was performed with SIEMENS ACUSON S2000 ultrasound system and RTE with HITACHI HI VISION-Preirus and EUP-L52 linear probe (3-7MHz). The median values of 10 measurements in ARFI and RTE were calculated, respectively. We used platelet count and P2/MS [platelet count (109/L)]2/ [monocyte fraction(%)×segmented neutrophil fraction (%)] for predicting more accurately liver fibrosis. We defined Vs as velocity of sheer wave (m/s) in ARFI and Es as elasticity score in RTE. Results: From 70 patients, 10 had METAVIR scoring system F0, 4 had F1, 22 had F2, 12 had F3 and 22 had F4. Positive correlations between each methods and fibrosis were found in FibroScan®, ARFI, RTE, P2MS, Vs/PLT, Vs/P2MS, Es/PLT, and Es/P2MS. In the diagnosis of significanct fibrosis (≥F2), the area under the receiver-operating characteristic curve (AUROC)s by FibroScan, ARFI and RTE are 0.689, 0.687 and 0.554. The AUROCs by Vs/PLT and Es/PLT are 0.860 and 0.769. In addition, the AUROCs by P2MS, Vs/P2MS and Es/P2MS are 0.781, 0.778 and 0.746. Comparing with AUROC of each methods for predicting fibrosis (≥F2), Vs/PLT is superior to ARFI (p=0.0018) and Es/PLT is also superior to RTE (p=0.015). Es/P2MS is superior to RTE (p=0.0316), but Vs/P2MS is not significantly different to ARFI (p=0.1491). Moreover, Vs/P2MS is not superior to Vs/PLT (p=0.0084) and not significantly different to Es/PLT (p=0.5481). Conclusion: Both FibroScan® and ARFI are useful noninvasive modalities for the assessment of liver fibrosis. Vs/P2MS and Es/P2MS can be more helpful for predicting liver fibrosis in NALD than elastography alone, but are not superior to Vs/PLT and Es/PLT.
Hwan Hee Yu,Myung Wook Song,Tae-kyung Kim,Yun-sang Choi,Gyu Yong Cho,Na-kyoung Lee,Hyun-dong Paik 한국축산식품학회 2018 한국축산식품학회지 Vol.38 No.2
The objective of this study was to investigate comparison of physicochemical, microbiological, and sensory characteristics of Hanwoo eye of round by various packaging methods [wrapped packaging(WP), modified atmosphere packaging(MAP), vacuum packaging (VP) with three different vacuum films, and vacuum skin packaging (VSP)] at a small scale. Packaged Hanwoo beef samples were stored in refrigerated conditions (4±1℃) for 28 days. Packaged beefwas sampled on days0, 7, 14, 21, and 28. Physicochemical [pH, surface color, thiobarbituric acid reactive substances (TBARS), and volatilebasic nitrogen(VBN) values], microbiological, and sensory analysis of packaged beef samples were performed. VP and VSP samples showed low TBARS and VBN values, and pH and surface color did notchange substantially during the 28-dayperiod. For VSP, total viable bacteria, psychrotrophic bacteria, lactic acid bacteria, and coliform counts were lower than those for other packaging systems. Salmonella spp. and Escherichia coliO157:H7 were not detected in any packaged beef samples. A sensory analysis showed that the scores for appearance, flavor, color, and overall acceptability did not change significantly until day 7. In total, VSP was effective with respect to significantly higher a* values, physicochemical stability, and microbial safety in Hanwoo packaging (p<0.05).