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Kim, Eugene,Kim, Hyun-Chang,Lim, Young-Jin,Kim, Chi-Heon,Sohn, Seil,Chung, Chun-Kee,Kim, Hyoung-Jun,Kang, Hyun,Park, Hee-Pyoung RAVEN PRESS PUBLISHERS 2017 JOURNAL OF NEUROSURGICAL ANESTHESIOLOGY Vol.29 No.1
<P>Conclusions: The IAP in the prone position was significantly lower using the Jackson table compared with the Wilson frame and chest rolls. A PEEP up to 9 cm H2O can be safely used in healthy euvolemic patients undergoing prone spinal surgery without a clinically significant increase in IAP, irrespective of the type of prone positional apparatus.</P>
Kim Jaehwan,Kim Chai Yoon,Kim Jeong Gyun,Kim Hakyung,Sheen Seung Hun,Han In-bo,Sohn Seil 대한말초신경학회 2023 The Nerve Vol.9 No.1
Objective: This nationally matched longitudinal study aimed to investigate the relationship between acute myocardial infarction (AMI) and ossification of the posterior longitudinal ligament (OPLL) in Korea.Methods: We collected patient data from January 1, 2004 to December 31, 2015 from the National Health Insurance Service Health Screening Cohort. Patients with OPLL were defined as patients with the International Classification of Diseases, Tenth Revision code M48.8 (other specified spondylopathies) and were newly diagnosed through computed tomography imaging. The OPLL group had a total of 1,289 patients. The control group included 6,445 people. Utilizing the Kaplan-Meier technique, The incidence of AMI in both groups was estimated. A Cox proportional-hazards regression analysis was used to compute the AMI hazard ratio.Results: After controlling for age and sex, the hazard ratio of AMI in the OPLL group was 2.065 (95% confidence interval [CI], 1.228-3.474). The adjusted hazard ratio in the OPLL group was 2.209 after restricting the sample for demographics and concomitant medical conditions (95% CI, 1.311-3.721). In a subgroup analysis, the incidence of AMI was substantially greater in the OPLL group, which included women younger than 65 years and without hypertension, diabetes, or dyslipidemia.Conclusion: This nationwide longitudinal study found that patients with OPLL were at higher risk of AMI.
Single‑Walled Carbon Nanotube‑Based Chemi‑Capacitive Sensor for Hexane and Ammonia
Seil Kim,Kyu-Hwan Lee,Ju-Yul Lee,Kyoung-Kook Kim,Yong-Ho Choa,Jae-Hong Lim 대한금속·재료학회 2019 ELECTRONIC MATERIALS LETTERS Vol.15 No.6
Two configurations of single-walled carbon nanotube-based chemi-capacitive gas sensors were fabricated, i.e., horizontaland vertical. Further, their sensing properties for hexane and ammonia (NH3) vapor were characterized and compared withchemi-resistive-type sensing properties. Upon exposure to hexane and NH3vapor, both capacitance and resistance variedas the analyte concentration increased. The sensing sensitivity measured along the horizontal direction increased with thedevice resistance. However, the capacitive sensing response along the vertical direction was independent of the number andfraction of semi-conductive single-walled carbon nanotubes. Furthermore, the vertical chemi-capacitive sensing responsewas dependent on the dipole moment of analytes.
Kim, Seil,Song, Yoseb,Hwang, Tae-Yeon,Lim, Jae-Hong,Choa, Yong-Ho Pergamon Press 2019 International journal of hydrogen energy Vol.44 No.21
<P><B>Abstract</B></P> <P>A novel method for fabrication of a thermochemical hydrogen (TCH) gas sensor composed of platinum (Pt)-decorated graphene sheets and a thermoelectric (TE) polymer nanocomposite was investigated. The hydrogen sensing characterization for the device included gas response, response time (T<SUB>90</SUB>), recovery time (D<SUB>10</SUB>), and reliability testing, which were systematically conducted at room temperature with a relative humidity of 55%. Here, the Pt-decorated graphene sheets act as both an effective hydrogen oxidation surface and a heat-transfer TE polymer nanocomposite having low thermal conductivity. This property plays an important role in generating output voltage signal with a temperature difference between the top and bottom surfaces of the nanocomposite. As a result, our TCH gas sensor can detect the range of hydrogen from 100 ppm to percentage level with good linearity. The best response and recovery time revealed for the optimized TCH gas sensor were 23 s and 17 s under 1000 ppm H<SUB>2</SUB>/air, respectively. This type of sensor can provide an important component for fabricating thermoelectric-based gas sensors with favorable gas sensing performance.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A novel-type of TE composite-based hydrogen gas sensor was fabricated. </LI> <LI> Gas response of the sensor was considerably linear at low- and high concentrations. </LI> <LI> The sensor has a detection limit of 100 ppm with high signal to noise ratio. </LI> <LI> The response/recovery times were 23 s and 17 s under 1000 ppm H<SUB>2</SUB>/air, respectively. </LI> </UL> </P>
Outside Directors’ Insider Trading Around Board Meetings
( Seil Kim ),( Seungjoon Oh ) 한국금융연구원 2022 금융연구 working paper Vol.2022 No.15
Using a novel dataset containing U.S. companies’ regular board meeting schedules, we find evidence of informed trading by outside directors prior to board meetings. In the days prior to board meetings, when outside directors possess private information, they make purchases that yield higher abnormal returns and are larger than those made during periods distant from board meetings. We find no such pattern for inside directors who possess private information regardless of the timing of board meetings. Moreover, we find that these patterns are especially exhibited by trades made by more sophisticated directors, trades made prior to board meetings that result in news disclosures, and nonroutine trades. Our results suggest that outside directors trade based on information they obtain in preparation for board meetings.
Fabrication and characterization of thermochemical hydrogen sensor with laminated structure
Kim, Seil,Song, Yoseb,Lim, Hyo-Ryoung,Kwon, Young-Tae,Hwang, Tae-Yeon,Song, Eunpil,Lee, Songjun,Lee, Young-In,Cho, Hong-Baek,Choa, Yong-Ho Elsevier 2017 International journal of hydrogen energy Vol.42 No.1
<P><B>Abstract</B></P> <P>In this study, we reported the simple and cost-effective fabrication of thermochemical hydrogen (TCH) sensors composed of chalcogenide thin films and Pt/Al<SUB>2</SUB>O<SUB>3</SUB> powders. Chalcogenide thin films of two types, composed of Bi<SUB>2</SUB>Te<SUB>3</SUB> (monomorphic-type) and Bi<SUB>2</SUB>Te<SUB>3</SUB> Sb<SUB>2</SUB>Te<SUB>3</SUB> (four-leg PN junction-type), were prepared by electrochemical deposition. The Pt/Al<SUB>2</SUB>O<SUB>3</SUB> powder, which acts as a heating catalyst, was synthesized by impregnation of an Al<SUB>2</SUB>O<SUB>3</SUB> powder with an aqueous solution of platinum (IV) chloride pentahydrate. Its heating process was optimized via a hydrogen-sensing evaluation to control the size of the Pt particles. The monomorphic-type TCH sensor showed an output signal of 14.2 μV in response to 10 vol% hydrogen gas, whereas an output signal of 39.6 μV was obtained from a four-leg PN junction–type TCH sensor. Even though the n–p junction-type had the same deposition area as that of the monomorphic-type, the output signal of the n–p junction TCH sensor was greater by a factor of 2.8. In addition, the monomorphic-type TCH sensor had an inferior response time (T<SUB>90</SUB>) of 31 s and a longer recovery time (D<SUB>10</SUB>) of 38 s; the four-leg PN junction-type TCH sensor had a lowest response time of 27 s and a fastest recovery time of 9 s (in 3% H<SUB>2</SUB>/air at room temperature).</P> <P><B>Highlights</B></P> <P> <UL> <LI> Thermochemical hydrogen sensor composed of chalcogenide thin film and Pt/Al<SUB>2</SUB>O<SUB>3</SUB> catalyst was fabricated. </LI> <LI> Voltage signal of the n–p junction type sensor was higher than monomorphic type sensor. </LI> <LI> Heat dissipation of n–p junction type sensor was superior to that of monomorphic type one. </LI> <LI> Response and recovery time of n–p junction type sensor were 27.4 and 9.6 s in 3% H<SUB>2</SUB>/air. </LI> </UL> </P>
<i>Asticcacaulis</i> <i>solisilvae</i> sp. nov., isolated from forest soil
Kim, Seil,Gong, Gyeongtaek,Park, Tai Hyun,Um, Youngsoon International Union of Microbiological Societies 2013 International journal of systematic and evolutiona Vol.63 No.10
<P>An obligately aerobic, chemoheterotrophic, mesophilic prosthecate bacterium, designated strain CGM1-3EN<SUP>T</SUP>, was isolated from the enrichment cultures of forest soil from Cheonggyesan Mountain, Republic of Korea. Cells were Gram-reaction-negative, motile rods (1.3–2.4 µm long by 0.30–0.75 µm wide) with single flagella. The strain grew at 10–37 °C (optimum 25–30 °C) and at pH 4.5–9.5 (optimum 5.0–7.0). The major cellular fatty acids were C<SUB>16 : 0</SUB>, C<SUB>18 : 1</SUB>ω7<I>c</I> 11-methyl, C<SUB>12 : 1</SUB> 3-OH and summed feature 8 (comprising C<SUB>18 : 1</SUB>ω7<I>c</I>/C<SUB>18 : 1</SUB>ω6<I>c</I>). The genomic DNA G+C content of strain CGM1-3EN<SUP>T</SUP> was 63.7 mol%. The closest phylogenetic neighbour to strain CGM1-3EN<SUP>T</SUP> was identified as <I>Asticcacaulis biprosthecium</I> DSM 4723<SUP>T</SUP> (97.2 % 16S rRNA gene sequence similarity) and the DNA–DNA hybridization value between strain CGM1-3EN<SUP>T</SUP> and <I>A. biprosthecium</I> DSM 4723<SUP>T</SUP> was less than 24.5 %. Strain CGM1-3EN<SUP>T</SUP> used <SMALL>d</SMALL>-glucose, <SMALL>d</SMALL>-fructose, sucrose, maltose, trehalose, <SMALL>d</SMALL>-mannose, <SMALL>d</SMALL>-mannitol, <SMALL>d</SMALL>-sorbitol, <SMALL>d</SMALL>-galactose, cellobiose, lactose, raffinose, fumarate, pyruvate, <SMALL>dl</SMALL>-alanine and glycerol as carbon sources. Based on data from the present polyphasic study, the forest soil isolate CGM1-3EN<SUP>T</SUP> is considered to represent a novel species of the genus <I>Asticcacaulis</I>, for which the name <I>Asticcacaulis</I> <I>solisilvae</I> sp. nov. is proposed. The type strain is CGM1-3EN<SUP>T</SUP> ( = AIM0088<SUP>T</SUP> = KCTC 32102<SUP>T</SUP> = JCM 18544<SUP>T</SUP>).</P>
Kim, Seil,Song, Yoseb,Ryu, Seung Han,Hwang, Tae-Yeon,Lee, Youngsuk,Lim, Jae-Hong,Lee, Joo-Yul,Lee, Kyu-Hwan,Choa, Yong-Ho Elsevier Sequoia 2019 Synthetic metals Vol.254 No.-
<P><B>Abstract</B></P> <P>A three-dimensional thermoelectric (TE) nanocomposite based on functionalized single-walled carbon nanotubes (f-SWCNTs), tellurium nanowires (Te NWs), and polymethyl methacrylate (PMMA) microbeads was fabricated by a hot compaction via solvent casting. We chose a minimum content of f-SWCNTs of 1 wt% for fabricating the nanocomposite based on percolation threshold. The nanocomposite containing 2 wt% f-SWCNTs and 48 wt% Te NWs exhibited an electrical conductivity of 0.93 S/cm, a Seebeck coefficient of 303 μV/K, a thermal conductivity of 0.23 W/mK and a figure-of-merit (<I>ZT</I>) of 0.01 at RT. The electrical conductivity of the nanocomposite were higher than that of the Te NW/PMMA nanocomposite. In contrast, the thermal conductivity value showed a trend opposite to that of the electrical conductivity. This is because the f-SWCNTs formed bridges between the Te NWs into the nanocomposite, resulting in heterostructured interfaces. We believe that this-type nanocomposite can be widely used for thermoelectric generators at low temperature.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A hybrid TE nanocomposite was fabricated by hot compaction via solvent casting. </LI> <LI> Functionalized-SWCNTs formed bridges between the Te NWs in the TE nanocomposite. </LI> <LI> The thermal conductivity is insensitive to f-SWCNT density due to poor thermal transfer between Te NW and f-SWCNTs. </LI> <LI> The hybrid nanocomposite exhibited a figure-of-merit (<I>ZT</I>) of 0.01 at room temperature. </LI> </UL> </P>