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Baekhee Lee,Seunghoon Lee,Hayoung Jung,Jawon Lee,Teukgyu Choi,Mina Lee,Hogeun Kim,Eunha Kim,Hojun Jeon,Youngbum Cho,Seungwoo Seo,Heecheon You 대한인간공학회 2014 대한인간공학회 학술대회논문집 Vol.2014 No.11
Objective: The present study is to evaluate satisfaction of vehicle outside door handles (ODHs) by design factor for improving grip comfort. Background: Existing studies have mainly focused on size and/or shape of typical handles (e.g., cylindrical handle); therefore, a specialized research for ergonomic ODH design is needed. Method: Satisfaction (operation, shape, height, width, tilting angle, central radius (R), inside upper R, inside middle R, inside lower R, pressure distribution, and overall satisfaction) by design factor (2-level: section width; 3-level: central R, inside upper R, inside middle R, inside lower R, tilting angle, and section height) were analyzed by applying a Taguchi L18 design (2¹ × 3<SUP>6</SUP>). Design levels by design factor were determined referring to 5 existing ODHs. 18 ODHs developed in the study were relatively evaluated comparing with a reference ODH (0 point) through an 11-point bipolar scale (-5: extremely dissatisfaction, 0: no difference, +5: extremely satisfaction) by twenty participants aged 20s ~ 50s. Results: Section width and inside upper R were significant on satisfaction of ODH. Conclusion: A design guideline for ODH was established considering users’ satisfaction. Application: The design factor evaluation protocol using Taguchi method applied in the study can be applicable to the other vehicle moving handles (e.g., inside door handle, door trim grip handle, door trim pull handle).
Rare Imaging of Fat Embolism Seen on Computed Tomography in the Common Iliac Vein after Polytrauma
( Hojun Lee ),( Jonghwan Moon ),( Junsik Kwon ),( John Cook-jong Lee ) 대한외상학회 2018 大韓外傷學會誌 Vol.31 No.2
Fat embolism refers to the presence of fat droplets within the peripheral and lung microcirculation with or without clinical sequelae. However, early diagnosis of fat embolism is very difficult because the embolism usually does not show at the computed tomography as a large fat complex within vessels. Forty-eight-year-old male with pedestrian traffic accident ransferred from a local hospital by helicopter to the regional trauma center by two flight surgeons on board. At the rendezvous point, he had suffered with dyspnea without any airway obstruction sign with 90% of oxygen saturation from pulse oximetry with giving 15 L of oxygen by a reserve bag mask. The patient was intubated at the rendezvous point. The secondary survey of the patient revealed multiple pelvic bone fracture with sacrum fracture, right femur shaft fracture and right tibia head fracture. Abdominal computed tomography was performed in 191 minutes after the injury and fat embolism with Hounsfield unit of -86 in his right common iliac vein was identified. Here is a very rare case that mass of fat embolism was shown within common iliac vein detected in computed tomography. Early detection of the fat embolus and early stabilization of the fractures are essential to the prevention of sequelae such as cerebral fat embolism.
<i>Undibacterium piscinae</i> sp. nov., isolated from Korean shiner intestine
Lee, So-Yeon,Kang, Woorim,Kim, Pil Soo,Kim, Hyun Sik,Sung, Hojun,Shin, Na-Ri,Whon, Tae Woong,Yun, Ji-Hyun,Lee, Jae-Yun,Lee, June-Young,Jung, Mi-Ja,Jeong, Yun-Seok,Tak, Euon Jung,Han, Jeong Eun,Hyun, D Society for General Microbiology 2019 International journal of systematic and evolutiona Vol.69 No.10
<P> A novel Gram-stain-negative, non-spore-forming, obligate aerobic, motile, rod-shaped, and flagellated bacterium, designated S11R28<SUP>T</SUP>, was isolated from the intestinal tract of a Korean shiner, <I>Coreoleuciscus splendidus</I>. Based on 16S rRNA gene sequences, strain S11R28<SUP>T</SUP> was identified as member of the genus <I>Undibacterium</I> in class <I>Betaproteobacteria,</I> and was closely related to <I>Undibacterium parvum</I> DSM 23061<SUP>T</SUP> (98.49%). The isolate grew at 4-25℃, pH 6-9, with 0% (w/v) NaCl, and grew optimally at 20℃, pH 8, in the absence of NaCl. The main cellular fatty acids were C<SUB>16 : 0</SUB> and summed features 3 (C<SUB>16 : 1</SUB>ω7c and/or C<SUB>16 : 1</SUB>ω6c). The strain possessed diphosphatidylglycerol, phosphatidylglycerol, and phosphatidylethanolamine as predominant polar lipids, and ubiquinone Q-8 as a respiratory quinone. The polyamine profile composed of 2-hydroxyputrescine, spermidine, putrescine, and benzoic acid. A genomic DNA G+Ccontent was 51.4mol%. The average nucleotide identity between strains S11R28<SUP>T</SUP> and U. parvum DSM 23061<SUP>T</SUP> was 78.66%. Thus, <I>Undibacterium piscinae</I> can be considered a novel species within the genus <I>Undibacterium</I> with the type strain S11R28<SUP>T</SUP> (=KCTC 62668<SUP>T</SUP> =JCM 33224<SUP>T</SUP>). </P>
Splenic Autotransplantation after Blunt Spleen Injury in Children
( Hojun Lee ),( Byung Hee Kang ),( Junsik Kwon ),( John Cook-jong Lee ) 대한외상학회 2018 大韓外傷學會誌 Vol.31 No.2
Non-operative management has been preferred in blunt spleen injury. Moreover children are more susceptible to post-splenectomy infection, spleen should be preserved if possible. However, splenectomy is inevitable to patients with severe splenic injury. Therefore splenic autotransplantation could be the last chance for preserving splenic function in these patients although efficacy has not proven. Here we reported four cases of children who were underwent splenic autotransplantation successfully after blunt trauma.
Carbon layer supported nickel catalyst for sodium borohydride (NaBH<sub>4</sub>) dehydrogenation
Lee, Jaeyeong,Shin, Hojun,Choi, Kyoung Soon,Lee, Jouhahn,Choi, Jae-Young,Yu, Hak Ki Elsevier 2019 International journal of hydrogen energy Vol.44 No.5
<P><B>Abstract</B></P> <P>In this paper, a nickel (Ni) catalyst with large surface area supported by a graphitic layer is proposed. The graphitic layer is formed on a Ni foil by chemical vapor deposition (CVD) using CH<SUB>4</SUB> as a source. The Ni foil is partially etched by a chemical etchant to increase the surface to volume ratio. The H<SUB>2</SUB> generation rates of the catalysts for different Ni etching times are measured and their surfaces are observed using an optical microscope. The optimized Ni etching time is 6 h, and the catalyst prepared by 6 h of etching shows an H<SUB>2</SUB> generation rate of about 600 ml/min⋅(g metal). The 6-h etched Ni/graphitic layer (Ni/G) is reused five times to confirm durability; it shows a high performance without any degradation. The H<SUB>2</SUB> generation rate for different concentrations of NaBH<SUB>4</SUB> is measured. The reaction follows first order kinetics, which means that the higher the concentration of NaBH<SUB>4</SUB> is, the faster the H<SUB>2</SUB> generation is.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Nickel foil with increased surface area showed excellent catalytic performance. </LI> <LI> A graphitic layer prevents nickel from tearing or damaging. </LI> <LI> The rate of hydrogen generation of sodium borohydride is about 600 ml/min·(g metal). </LI> <LI> The catalyst showed excellent stability even after 5 repetitions. </LI> </UL> </P>