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Electropulsing Treatment on Enhancement of Electrical Conductivity of Screen-Printed Ag Wire
Ju‑Won Park,Howook Choi,Hwangsun Kim,Simoon Sung,Hye‑Jin Jeong,Il Kim,Jaeseok Gong,Sung‑Tae Hong,Heung Nam Han 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.5
The effect of high electric current density on the sintering of Ag wires manufactured by screen printing is evaluated throughelectrical resistivity analysis and microstructure observation. Different forms (continuous and pulsed) of electric currentwith different current densities are applied to the specimens. Conventional heat treatment is also performed as a controlgroup to examine the athermal effect of electropulsing treatment. Compared to the conventional heat treatment, the resistivityis reduced more under the electropulsing treatment with continuous current for the same temperature and treatment time.Also, the process time of electropulsing treatment can be reduced by applying a pulse form of high density current insteadof continuous current without losing the benefit of enhanced reduction of resistivity. The microstructural observationsobtained from high angle annular dark field scanning transmission electron microscope and a digital precession instrumentclearly show that necking connecting the crystals is formed more firmly under electric current. In addition, the temperaturechange of Ag wire and substrate is calculated according to the change of the resistivity when the electric current is appliedto confirm the reliability.
BLDC Motor Cogging Torque Calculation with the Moving Material Method in the Finite Element Method
Won, Sung-Hong,Choi, Jae-Hoon,Lee, Ju The Korean Institute of IIIuminating and Electrica 2008 조명·전기설비학회논문지 Vol.22 No.3
Conventionally, when we need to know about the dynamic characteristics of motors, the moving band method has been the first considerable technique. In this paper, we have investigated the moving material method that moves the property of the material in moving area elements of BLDC motors, instead of moving mesh elements of the rotor. From this method, we can reduce the demanded HDD memory for FEM analysis and the calculation time with same results.
TIARA: a database for accurate analysis of multiple personal genomes based on cross-technology
Hong, Dongwan,Park, Sung-Soo,Ju, Young Seok,Kim, Sheehyun,Shin, Jong-Yeon,Kim, Sujung,Yu, Saet-Byeol,Lee, Won-Chul,Lee, Seungbok,Park, Hansoo,Kim, Jong-Il,Seo, Jeong-Sun Oxford University Press 2011 Nucleic acids research Vol.39 No.1
<P>High-throughput genomic technologies have been used to explore personal human genomes for the past few years. Although the integration of technologies is important for high-accuracy detection of personal genomic variations, no databases have been prepared to systematically archive genomes and to facilitate the comparison of personal genomic data sets prepared using a variety of experimental platforms. We describe here the Total Integrated Archive of Short-Read and Array (TIARA; http://tiara.gmi.ac.kr) database, which contains personal genomic information obtained from next generation sequencing (NGS) techniques and ultra-high-resolution comparative genomic hybridization (CGH) arrays. This database improves the accuracy of detecting personal genomic variations, such as SNPs, short indels and structural variants (SVs). At present, 36 individual genomes have been archived and may be displayed in the database. TIARA supports a user-friendly genome browser, which retrieves read-depths (RDs) and log2 ratios from NGS and CGH arrays, respectively. In addition, this database provides information on all genomic variants and the raw data, including short reads and feature-level CGH data, through anonymous file transfer protocol. More personal genomes will be archived as more individuals are analyzed by NGS or CGH array. TIARA provides a new approach to the accurate interpretation of personal genomes for genome research.</P>
Won-Jung Kim,Sung-Chang Hong,Eun-Ju Do,Kyungho Suk,윤익진,이원하 한국통합생물학회 2009 Animal cells and systems Vol.13 No.2
Extracts derived from various medical mushrooms have been reported to have antitumor and immunomodulatory properties. In order to investigate the antitumor activity of keumsa Linteusan, the water extract of Phellinus limteus, HT1080 cells, a human fibrosarcoma cell line, were treated with it and changes in cellular migration potential was tested in vitro. At a concentration range below 1,000 µg/ mL, Linteusan blocked, in a dose dependent manner, the migration of cells through Matrigel as well as Boyden chamber without affecting the viability of the cells. Prolonged treatment of HT1080 cells with Linteusan suppressed TNF- α induced production of matrix metalloproteinase (MMP)-9 as well as basal level expression of MMP-2. Linteusan also affected the adhesion of the cells to fibronectin-coated surfaces. The effect of Linteusan on cell signaling pathways was also tested. Linteusan specifically affected TNF-α induced phosphorylation of AKT in a dose-dependent manner, while phosphorylation levels of ERK remained unaffected. These data indicate that Linteusan blocks the migration of HT1080 cells by affecting various processes associated with cell migration such as the expression of matrix degrading enzymes, cell adhesion, and AKT-medicated cellular signaling pathways.
Is Weight Change after Acute Myocardial Infarction Beneficial?
( Won Yu Kang ),( Seung Hwan Hwang ),( Sun Ho Hwang ),( Wan Kim ),( Keun Ho Park ),( Young Joon Hong ),( Ju Han Kim ),( Youngkeun Ahn ),( Myung Ho Jeong ) 대한내과학회 2011 대한내과학회 추계학술대회 Vol.2011 No.1
Background: Obesity is a well-established risk factor for many chronic disorders. However, the effect of weight change after acute myocardial infarction (AMI) is not well known. Methods: Among consecutive patients who underwent percutaneous coronary intervention (PCI) between November 2005 and November 2007 due to acute myocardial infarction (AMI), patients who were overweight (23.0≤BMI<27.5 kg/㎡, n=341) and obese (BMI≥27.5 kg/㎡, n=80) were selected for analysis. According to weight change, patients were divided into 4 groups: Group I (weight loss>5%, n=61), Group II (0% weight loss≤5%, n=133), Group III (0%≤weight gain<5%, n=181), and Group IV (weight gain≥5%, n=46). We assessed association between weight change and major cardiac adverse events (MACE). Results: Greater weight loss was more frequent among older individuals (Group I: 64.1±12.4, II: 60.6±12.1, III: 59.0±11.9, IV: 61.4±10.6 years, p=0.028) and diabetics (Group I: 34.4%, II: 27.1%, III: 21.2%, IV: 15.2%, p=0.009). However, there were no significant differences in distributions of other baseline characteristics including hypertension, dyslipidemia, smoking, and gender among groups, or in angiographic and procedural factors including lesion characteristics, procedural success, target lesion location, number of stents used, and stent size, except for proportions of patients with three-vessel disease, which were higher in patients with weight loss (Group I: 20.8%, II: 23.0%, III: 12.5%, IV: 11.6%, p=0.005). The group with greater weight loss had the highest MACE rate at 12 month clinical follow-up (Group I: 36.9%, II: 25.0%, III: 25.9%, IV: 17.3%, p=0.020). Conclusions: Although weight loss after MI appears to be associated with worse outcomes, it remains unclear whether the effect is of cardiac origin. Further prospective study is needed to elucidate the effect of intentional weight reduction after MI.
Hong, Ji-Young,Jung, Ji-Ye,Kang, Young-Ae,Park, Byung-Hoon,Jung, Won-Jai,Lee, Su-Hwan,Kim, Song-Yee,Lee, Sang-Kook,Chung, Kyung-Soo,Park, Seon-Cheol,Kim, Eun-Young,Lim, Ju-Eun,Kim, Se-Kyu,Chang, Joon The Korean Academy of Tuberculosis and Respiratory 2011 Tuberculosis and Respiratory Diseases Vol.71 No.6
Background: Endobronchial ultrasound-guided transbronchial needle aspiration (EBUS-TBNA) is a technique developed to allow mediastinal staging of lung cancer and also to evaluate intrathoracic lymphadenopathy. In a tuberculosis-endemic area, tuberculosis should be considered as an etiology of mediastinal lymphadenopathy. The aim of this study was to investigate the utility of the routine culture for tuberculosis from specimens of EBUS-TBNA. Methods: We prospectively performed routine culture for tuberculosis from aspiration or core biopsy specimens got from 86 patients who had undergone EBUS-TBNA due to mediastinal lymphadenopathy between March 2010 and March 2011. Results: A total of 135 lymph node aspiration and 118 core biopsy specimens were included in this analysis. We confirmed the malignancy in 62 (72.9%), tuberculosis in 7 (8.1%), sarcoidosis in 7 (8.1%), asperogillosis in 2 (2.3%) and pneumoconiosis in 2 (2.3%) patients. One lung cancer patient had pulmonary tuberculosis coincidentally and 5 patients had unknown lymphadenopathy. The number of positive culture for Mycobacterium tuberculsosis by EBUS-TBNA is 2 (1.5%) from 135 lymph node aspiration specimens and 2 (1.7%) from 118 core biopsy specimens. Out of eight patients confirmed with tuberculosis, only one patient had positive mycobacterial culture of aspiration specimen from EBUS-TBNA without histopathologic diagnosis. Conclusion: These results propose that routine culture for tuberculosis from EBUS-TBNA may not provide additional information for the diagnosis of coincident tuberculous lymphadenitis. However, if there is any possibility of tuberculous lymphadenopathy or pulmonary tuberculosis, it should be considered to perform EBUS-TBNA in patients who have negative sputum AFB smears or no sputum production.