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Kang, Seok,Yoon, Joon Shik,Lee, Chung Ho,Kim, Guk-Han,Choi, Hyuk,Kim, Jae Do,Park, Hong Seok Williams & Wilkins Co 2018 Medicine Vol.97 No.51
<▼1><P>Supplemental Digital Content is available in the text</P></▼1><▼2><P><B>Abstract</B></P><P>Intermittent catheterization is an effective bladder management strategy for patients with incomplete bladder emptying. For self-catheterization, sufficient hand function in both hands is necessary. We have developed a novel automatic urinary catheterization device to induce self-IC for patients with bladder dysfunction and upper extremity disability. The aim of this study was to investigate the feasibility of this novel automatic catheterization device.</P><P>This study was performed using 4 fresh cadavers. First, 400 mL of normal saline was filled into the cadaver bladder. Then, the catheter was inserted using the newly developed device. The catheter insertion was performed 3 times for each cadaver, with the penis positioned at 45°, 90°, and 135°, respectively. A transrectal ultrasonography was performed during the catheterization. We evaluated whether the catheter was successfully inserted into the bladder at each position of penis and whether the urethrovesical junction was injured when inserting the catheter. We also measured the volume of normal saline evacuated from the bladder after successful catheterization.</P><P>With the penis positioned at 45° and 90°, catheter insertion was successful without any damage to the urethrovesical junction. However, when the penis was at 135°, the catheter could not be inserted into the bladder. When the automatic catheter insertion was successful, the bladder was successfully emptied. On average, 81.56 ± 3.26% of normal saline was discharged from the bladder and 11.13 ± 2.09% was remained.</P><P>The newly developed automatic urinary catheterization device could insert the catheter effectively and safely. This device would be a useful tool for the urinary catheterization of bladder dysfunction patients with upper extremity disability.</P></▼2>
Framing North Korea on Twitter: Is Network Strength Related to Sentiment?
Kang, Seok World Association for Triple Helix and Future Stra 2021 Journal of Contemporary Eastern Asia Vol.20 No.2
Research on the news coverage of North Korea has been paying less attention to social media platforms than to legacy media. An increasing number of social media users post, retweet, share, interpret, and set agendas on North Korea. The accessibility of international users and North Korea's publicity purposes make social media a venue for expression, news diversity, and framing about the nation. This study examined the sentiment of Twitter posts on North Korea from a framing perspective and the relationship between network strengths and sentiment from a social network perspective. Data were collected using two tools: Jupyter Notebook with Python 3.6 for preliminary analysis and NodeXL for main analysis. A total of 11,957 tweets, 10,000 of which were collected using Python and 1,957 tweets using NodeXL, about North Korea between June 20-21, 2020 were collected. Results demonstrated that there was more negative sentiment than positive sentiment about North Korea in the sampled Twitter posts. Some users belonging to small network sizes reached out to others on Twitter to build networks and spread positive information about North Korea. Influential users tended to be impartial to sentiment about North Korea, while some Twitter users with a small network exhibited high percentages of positive words about North Korea. Overall, marginalized populations with network bonding were more likely to express positive sentiment about North Korea than were influencers at the center of networks.
( Kangseok Lee ),( Sang Eun Shim ) 한국고무학회 2015 엘라스토머 및 콤포지트 Vol.50 No.4
Polyvinylacetate (PVAc) was prepared using thermal initiation and redox initiation via emulsion polymerization at 80℃. The polymerization conditions had a significant effect on the properties of the synthesized PVAc. When hydrogen peroxide and tartaric acid as the initiator for redox polymerization were used, the synthesized PVAc had a low molecular weight. In comparison with thermal polymerization, smaller PVAc particles were formed during the redox polymerization due to relatively faster polymerization rate, which in turn resulted in improved adhesion property. It is considered that the rapid generation of smaller particles induces the formation of a large surface area.
Synthesis of Alkoxy Modified Silicone Using Alkali Catalyst
( Kangseok Lee ),( Sang Eun Shim ) 한국고무학회 2016 엘라스토머 및 콤포지트 Vol.51 No.2
Alkoxy modified silicone (PAMS) was synthesized from hydroxyl-terminated polydimethylsiloxane (OHPDMS) and vinyltrimethoxysilane (VTMO) under alkali catalyst (NaOH and KOH) at room temperature (25℃) via condensation polymerization. Then, the structural verification of the synthesized PAMS was confirmed using 1H-NMR and FTIR spectroscopy. The reaction rate of PAMSs was studied in terms of the concentration variation of alkali catalyst. The reaction rate increased with the concentration of alkali catalyst, but no correlation between conversion and concentration of alkali catalyst was observed.
Estimation of Load torque for Motorized Seat Belt System with Reduced-order Observer
Kangseok Lee,Chinchul Choi,Wootaik Lee 제어로봇시스템학회 2011 제어로봇시스템학회 국제학술대회 논문집 Vol.2011 No.10
This paper describes design and verification of reduced-order state observer to estimate state information such as angular velocity and load torque of a dc-motor for generating tension of the motorized seat belt (MSB) system. The MSB system provides functions to protect passengers and improve passenger’s convenience. To generate the exact tension to passenger, angular velocity and load torque should be measured or estimated. State information for MSB operations can be estimated without sensors by use of the reduced-order observer. The reduced-order observer is designed by the developed state space model. Designed reduced-order observer and retraction control algorithm are verified by experiments on the test bench.
Effect of Monomers in Vinyl Urethane Macromonomers on Dispersion Polymerization of Polystyrene
( Kangseok Lee ),( Sang Eun Shim ) 한국고무학회 2016 엘라스토머 및 콤포지트 Vol.51 No.2
The four different vinyl monomers in the reaction of isocyanate-terminated polyurethane prepolymer were used for the preparation of macromonomers and successfully employed in the dispersion polymerization of styrene. The chemical structures of vinyl monomer in macromonomers influenced on the polystyrene particle characteristics, such as the conversion, weight average molecular weights (Mw), polydispersity index (PDI), weight average diameter (Dw), and uniformity. The conversion of polystyrene increased with amounts of methyl group in vinyl monomer. Also the uniformity of polystyrene particles increased with amounts of methyl group in vinyl monomer.
The role of mucosal barriers in human gut health
Kangseok Seo,Jeongmi Seo,Jiyoun Yeun,Haebin Choi,Young-In Kim,장선영 대한약학회 2021 Archives of Pharmacal Research Vol.44 No.4
The intestinal mucosa is continuously exposedto a large number of commensal or pathogenic microbiotaand foreign food antigens. The intestinal epithelium formsa dynamic physicochemical barrier to maintain immunehomeostasis. To effi ciently absorb nutrients from food, theepithelium in the small intestine has thin, permeable layersspread over a vast surface area. Epithelial cells are renewedfrom the crypt toward the villi, accompanying epithelial celldeath and shedding, to control bacterial colonization. Tightjunction and adherens junction proteins provide epithelialcell–cell integrity. Microbial signals are recognized by epithelialcells via toll-like receptors. Environmental signalsfrom short-chain fatty acids derived from commensal microbiotametabolites, aryl hydrocarbon receptors, and hypoxiainducedfactors fortify gut barrier function. Here we summarizerecent fi ndings regarding various environmental factorsfor gut barrier function. Further, we discuss the role of gutbarriers in the pathogenesis of human intestinal disease andthe challenges of therapeutic strategies targeting gut barrierrestoration.