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( Hyunil Kim ),( Jin Woo Kim ),( Hong Jun Park ),( Su Young Kim ),( Hyun-soo Kim ),( Gwang Ho Baik ),( Sung Chul Park ),( Sang Jin Lee ),( Tae-hwa Go ) 대한소화기학회 2022 Gut and Liver Vol.16 No.1
Background/Aims: Endoscopic submucosal dissection (ESD) is a curative treatment modality for early gastric neoplasms; however, ESD can be a time-consuming process. To overcome this pitfall, we developed the one-step knife (OSK) approach, which combines an endoscopic knife and injection needle on a single sheath. We aimed to evaluate whether this approach could reduce the ESD procedure time. Methods: This single-blinded randomized multicenter trial at four tertiary hospitals from June 2019 to June 2020 included patients aged 19 to 85 years undergoing ESD. Patients were randomly assigned to two groups (OSK or conventional knife [CK]). The injection time, total procedure time, resected specimen size, submucosal fluid amount, degree of device satisfaction, and adverse events were evaluated and compared between groups. Results: Fifty-one patients were analyzed (OSK: 25 patients and CK: 26 patients). No baseline differences were observed between groups, with the exception of a higher portion of males in the OSK group. The mean injection time was significantly reduced in the OSK group (39.0 seconds) compared to that in the CK group (87.5 seconds, p<0.001). A decrease of more than 10 minutes in the total procedure time (18.0 minutes vs 28.1 minutes, p=0.055) in the OSK group compared to the CK group was observed. Second-look esophagogastroduodenoscopy revealed two delayed bleeding cases in the OSK group that were easily controlled by endoscopic hemostasis. Conclusions: OSK reduced the injection time and showed a decrease in total procedure time compared with the CK approach. OSK can be a feasible tool for ESD, especially in difficult cases. (Gut Liver 2022;16:44-52)
Hyunil Kim,Byung-Seong Suh,Won-Cheol Lee,Han-Seur Jeong,Kyung-Hun Son,Min-Woo Nam,Hyeong-Cheol Kim 대한직업환경의학회 2019 대한직업환경의학회지 Vol.31 No.-
Background: We investigated the association between long workhours and marital status change from married to divorced or separated status that might have bad health effects. Methods: A total of 40,654 participants with married status in 2014 were followed up in 2015. Weekly workhours were categorized into four groups: ≤ 40, 41–52, 53–60, and > 60 hours per week. Univariate and multivariate logistic regression analyses were performed to determine the relationship between groups of workhours and marital status change after adjusting for age, total monthly household income, working type, and depression with sex stratification. Results: The study populations consisted of 8,346 (20.5%) females and 32,308 (79.5%) males. Odd ratios (ORs) of marital status change for females working for more than 60 hours per week was 4.26 (95% confidence interval [CI]: 1.25–14.5), when working less than or equal to 40 hours per week was used as reference in the crude model. ORs of working more than 60 hours per week was 4.57 (95% CI: 1.02–20.5) in female workers when considering age, total household earning per month, working type of daytime, and depression in a dose-response manner. However, for male workers, long workhours were not significantly related to change of marriage status. Conclusions: Long workhours for more than 60 hours per week had significantly higher risk of divorce or separation in females, but not in males. Further follow-up studies are needed to evaluate long term effects of long workhours on divorce risk.
Deep learning-based cryptanalysis of blockciphers with Feistel structure
Hyunil Kim,Ongee Jeong,Youhyun Kim,Inkyu Moon 한국차세대컴퓨팅학회 2021 한국차세대컴퓨팅학회 학술대회 Vol.2021 No.11
The ciphertexts obtained by traditional encryption techniques is not totally random sequence forms. Many cryptanalytic studies based on mathematical analysis such as linear cryptanalysis and differential cryptanalysis have been conducted. Recently, deep learning-based cryptanalysis have been proposed to show more powerful attacks than the other mathematical-based approaches. In this paper, we propose a new automated deep learning-based approach to break encryption algorithms with Feistel structure.
Kim, Bongjun,Lee, Jong-Ho,Jin, Won Jong,Kim, Hong-Hee,Ha, Hyunil,Lee, Zang Hee Elsevier 2018 european journal of pharmacology Vol.823 No.-
<P>Rheumatoid arthritis (RA) is a chronic autoimmune disease that is characterized by uncontrolled joint inflammation and destruction of bone and cartilage. Previous studies have shown that C-X-C motif chemokine 10 (CXCL10) has important roles in RA development and that blocking CXCL10 expression effectively inhibits arthritis progression in animal models. However, clinical study using anti-CXCL10 monoclonal antibody (MDX-1100) to block CXCL10 expression in patients with RA did not show significant effectiveness. Therefore, we turned our attention to C-X-C motif chemokine receptor 3 (CXCR3), which is a receptor for CXCL9, CXCL10, and CXCL11, to treat RA. In the present study, administration of JN-2, our newly developed CXCR3 antagonist, ameliorated the progression of arthritis in a collagen-induced arthritis animal model. JN-2 also inhibited CXCR3-induced cell migration and pro-inflammatory cytokine expression of bone marrow-derived macrophages and CD4(+) T cells in vitro. In addition, we found that CXCL10 formed an auto-amplification loop through activation of NF kappa B. Furthermore, Phosphorylation of p65 at serine 536 played an important role in the auto-amplification of CXCL10. Overall, the present results demonstrated that JN-2 decreased inflammation by inhibiting CXCR3-enhanced cell migration and pro-inflammatory cytokine expression, which then ameliorated arthritis progression.</P>
Synthesis of Carbon Nanowalls by Microwave PECVD for Battery Electrode
Kim, Sung Yun,Shin, Seung Kwon,Kim, Hyungchul,Jung, Yeun-Ho,Kang, Hyunil,Choi, Won Seok,Kweon, Gi Back The Korean Institute of Electrical and Electronic 2015 Transactions on Electrical and Electronic Material Vol.16 No.4
The microwave plasma enhanced chemical vapor deposition (PECVD) system was used to grow a carbon nanowall (CNW) on a silicon (Si) substrate with hydrogen (H<sub>2</sub>) and methane (CH<sub>4</sub>) gases. To find the growth mechanism of CNW, we increased the growth time of CNW from 5 to 30 min. The vertical and surficial conditions of the grown CNWs according to growth time were characterized by field emission scanning electron microscopy (FE-SEM). Energy dispersive spectroscopy (EDS) measurements showed that the CNWs consisted solely of carbon.
The Designing and Realization of Digital Interactive Media Art based on Activity Theory
Hyunil C. Kim,Changyong Jung 보안공학연구지원센터 2016 International Journal of Multimedia and Ubiquitous Vol.11 No.8
Activity theory presents a broad and conceptual framework of analysis for HCI (Human Computer Interaction). As media art matures and becomes accepted as an art form, a theoretical and conceptual framework for its analysis and evaluation is needed. Activity theory studies the level of connection between the individual, community and society in a broad sense, and the connection's process of development is studied through different human practices as a philosophical base. As a branch of structuralism, activity theory analyzes the connotations of meaning in human activity and not the activity itself. Activity theory comes to researchers of interactivity, intuitively. The reason for this is that activity theory provides a common language in comprehending the delivery of meaning from an interactive art work, in the cultural and societal sense. In order to understand the activity of the participant of the artwork through activity theory is to clarify the purpose of the activity involved, pinpoint the elements of influences in the activity systems; the artist/designer can thoroughly plan the interactive art elements, and ultimately comprehend the apprehension of the participants. The pragmatics of the system transcend its uses into artist meaning and message through the participant own history of cultural and societal experiences.