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박용범,한지수,정동근,이인식,김암,민원기,지현숙,목정은 울산대학교 의과대학 1993 울산의대학술지 Vol.2 No.1
The purpose of this retrospective study was to define platelet indices in severe preeclampsia(N=98) and to compare them to normal nonpregnant values(N=93) during the years 1990-1993 in the Department of Obstetrics and Gynecology, College of medicine, University of Ulsan, Asan Medical Center. Indices evaluated included platelet count, mean platelet volume, and platelet distribution width. Means platelet volume was statistically different between two groups, however mean platelet count was significantly decreased(p=0.029) and platelet distribution width was significantly increased(p=0.0001) and platelet distribution width was significantly increased(p=0.0001) in severe preeclampria. Mean platelet volume versus platelet count in normal pregnancy showed a significant inverse nonlinear relationship(r=-0.39, 9<0.001) and that in preeclampsia was congruent with notmal nonpregnant valus. With same mean platelet volume, platelet distribution width showed tendency to shift to right in severe preeclampsia. These findings support the concept of severe preeclampsia as a compensated state of increased platelet comsumption comparing with normal pregnancy. We concluded from above results that quantification of platelet indices may have some value in screening for and following severe preeclampsia.
Facile Synthesis of CoNi/MgAl₂O₄ Catalyst for Efficient Dry Reforming of Methane
Dong Hyun Kim(김동현),Ahmed Eissa Ahmed Al-Shahat(아흐메드이사),Jae Hwan Jung(정재환),Kyubock Lee(이규복) 한국신재생에너지학회 2021 한국신재생에너지학회 학술대회논문집 Vol.2021 No.7
Nickel-based catalysts have been widely used for catalyzing the dry reforming of methane (DRM), due to their high catalytic activity and low-cost. However, they suffer from the deactivation process as a result of the carbon deposition, especially under long-term operating condition. As a result, the design of highly active and durable Ni-based catalysts for the DRM still is a great challenge. In this study, we report a facile strategy for fabricating CoNi/MgAl<sub>2</sub>O<sub>4</sub> catalyst by one-pot evaporation induced self-assembly (EISA) method. Our results demonstrated that the formation of nickel-cobalt alloy is an important factor for maintaining the catalyst’s durability under long-term DRM reaction conditions, and that catalytic activity varies greatly depending on the nickel content. At Co:Ni ratio of 1:4, the catalyst showed a surface area of 175 m<sup>2</sup>/g, and a particle size of 12 – 14 nm. When applied for the DRM reaction a 800℃, CH<sub>4</sub>/CO<sub>2</sub> of 1.0, and gas hourly space velocity (GHSV) of 36,000 h-1, it exhibited CO<sub>2</sub> and CH<sub>4</sub>conversion efficiencies of 98 and 92%, correspondingly. After 100 h, the catalyst performance maintained conversion efficiencies of 94 and 85% for CO<sub>2</sub> and CH<sub>4</sub>, respectively, indicating the excellent durability of the herein synthesized catalyst. Moreover, a small quantity of carbon (3.1%) was observed on the catalyst’s surface after the long-term reaction test, indicating the high resistance for carbon deposition.
Ahmed Abdullah Alzeyadi,Yang-Soo Kim,Hyo-Jin Lee,Sung-Ryeoll Park,Gwang Young Sung,Dong-Jin Kim,Ji-Hwan Jung,Jong-Ho Kim 대한견주관절의학회 2017 대한견주관절학회지 Vol.20 No.3
Background: To compare the clinical outcomes of arthroscopic capsular release in patients with and without inferior capsular release for shoulder stiffness. Methods: Between January 2010 and December 2015, 39 patients who underwent arthroscopic capsular release for shoulder stiffness were enrolled and randomized into two groups. In group I, 19 patients underwent arthroscopic capsular release of the rotator interval and anterior capsule. In group II, 20 patients underwent arthroscopic capsular release of the anterior to inferior capsule, including the rotator interval. The American Shoulder and Elbow Surgeons score, Constant scoring system, Simple Shoulder Test, visual analogue scale for pain, and range of motion (ROM) were used for evaluation before surgery, at 3, 6, and 12 months after surgery and on the last follow-up. Results: Preoperative demographic data revealed no significant differences (p>0.05). The average follow-up was 16.07 months. Both groups showed significantly increased ROM at the last follow-up compared with preoperative (p<0.05). At the last follow-up, no statistical differences were found (p>0.05) between groups I and II in functional scores and ROM (forward flexion, p=0.91; side external rotation, p=0.17; abduction external rotation, p=0.72; internal rotation, p=0.61). But we found that group II gained more flexion compared to group I at 3 months and 6 months (p<0.05) after the surgery. Conclusions: Both techniques of capsular release are effective for stiffness shoulder. However, the extended inferior capsular release shows superiority in forward flexion over anterior capsular release alone during 6 months of follows-up (level of evidence: Level I, therapeutic randomized controlled trial).
Ahmed, Hafiz Furqan,Honnyong Cha,Su-Han Kim,Dong-Hun Kim,Heung-Geun Kim IEEE 2015 IEEE transactions on industry applications Vol.51 No.4
<P>High-power-density bidirectional dc-dc converters consisting of buck-and-boost converters are widely used in hybrid electric vehicles due to their smaller size and low cost. With a conventional constant-value inductor, the light-load efficiency of these converters is greatly reduced because of the large constant peak-to-peak current swing and relatively constant conduction losses that result in the entire load range. This paper proposes a new type of nonlinear inductor using magnetorheological (MR) fluid to improve the intermediate- and light-load efficiencies of these converters. The use of the proposed inductor does not require any additional circuit or complex control, and yet, it has benefits of decreasing conduction losses and improving efficiency due to its increasing inductance when the load is changed from heavy to light. A 3.7-kW prototype converter is built, and the efficiency from heavy to light load is measured separately using the proposed MR fluid-gap inductor and conventional air-gap inductor, which validates the advantages of the proposed MR fluid-gap inductor.</P>
Doo Won Kim,Kyu-Kwan Im,Hee Jou Kim,DONG-HUN LEE,Yoong Ahm Kim,Jisu Choi,Kap Seung Yang 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.82 No.-
We examined the effects of different energies of electromagnetic irradiation on the molecular sizeincrease in the low-molecular-weight fraction offluidized catalytic cracking decant oil (LMFD), whichwas fractionated from the originalfluidized catalytic cracking decant oil. Microwave (MW) radiation wasemployed as a relatively low-energy source, and an electron beam (EB) was employed as a high-energysource. Variations in viscosity, color, molecular weight, and functional groups of the LMFD wereexamined before and after irradiation to illuminate the LMFD reaction mechanism. The viscosityincreased from 43.17 cP for LMFD to 3978 cP after 3 h of MW irradiation (MW3h) and to 1136 cP after1000 kGy EB irradiation (EB1000). The reddish-brown color of the LMFD changed to black for the MW3hsample, whereas the EB1000 sample changed to a dark brown. As evaluated by matrix-assisted laserdesorption ionization time-of-flight mass spectrometry, the molecular weights of the MW-irradiatedsamples increased more than those of the EB samples. The results can be related to the activation energiesfor radical formation and recombination. MW irradiation is considered to have an effective energy sourcefor both radical formation and recombination, whereas EB irradiation exhibits an energy too high forradical recombination.
Cultivation of Gracilaria chorda (Gracilariales, Rhodophyta) by Vegetative Regeneration
Kim, Ji-Hwan,Lee, Sa-Dong,Choi, Sung-Je,Chung, Ik-Kyo,Shin, Jong-Ahm The Korean Society of Phycology 2005 ALGAE Vol.20 No.2
To make a preliminary identification of the gracilarioid plant attached to cultivation ropes of Undaria pinnatifida and establish a method of cultivating this plant, the first taxonomic and cultivation studies on this species in Korea were conducted. This gracilarioid plant was identified from its morphological and anatomical features, as Gracilaria chorda. Growth tests using the 10, 20, and 30 cm cuttings of axes of G. chorda were performed twice, from May 3 to August 21, 2002 and from December 15, 2002 to April 3, 2003 in Ihoijin aquafarm, Hoijin, Jangheung, Jeollanamdo, Korea. In the first growing test, the thallus length of the 10, 20, and 30 cm cuttings increased twelve-fold, ten-fold, and seven-fold; the wet weight increased 81-fold, 60-fold, and 41-fold; the numbers of more than 10 cm-long branches increased 3.8-fold, 5.2-fold, and 6.1-fold, respectively. In the second growth test, the thallus length of the 10, 20, and 30 cm cuttings increased seven-fold, 5.5-fold, and four-fold; the wet weight increased 81-fold, 53-fold and 36-fold; the number of branches increased 3.8-fold, 7.3-fold, and 6.6-fold, respectively. The cultivation of G. chorda by vegetative regeneration using cuttings of thallus axes was successful for the first time in Korea.
Exsolution-based Co/Ni bimetallic Catalysts for Dry Reforming of Methane
Dong Hyun Kim(김동현),Ahmed Al-Shahat Eissa(아흐메드 알사하트 이사),Kyubock Lee(이규복) 한국에너지기후변화학회 2021 한국에너지기후변화학회 학술대회 Vol.2021 No.11
Ni-based catalysts are widely used for dry reforming of methane (DRM), due to their high catalytic activity and low-cost. However, Ni-based catalysts suffer from deactivation, especially under long-term operating conditions, because of carbon deposition and catalyst sintering. As a result, the design of efficient noble-metal-free catalysts for the DRM still a great challenge. Incorporating another element with Ni has been reported to promote the catalytic activity and coke resistance of catalyst. In this study, we report a facile strategy for fabricating CoNi/MgAl₂O₄ catalyst by one-pot evaporation induced self-assembly combine with exsolution method. During the reduction process, the active metals were successfully exsolved on the catalyst surface, and it was confirmed that CoNi alloy was formed. Our results demonstrate that the formation of a stable exsolved CoNi alloy is an important factor for maintaining the catalyst durability under long-term DRM reaction conditions, and the catalytic activity varies greatly depending on the nickel content. At Co:Ni ratio of 1:4, the catalyst showed a surface area of 175 ㎡/g, and particles size of 12 - 14 nm. When applied for the DRM reaction at 800 ℃ and gas hourly space velocity of 36,000 h<SUP>-1</SUP>, it exhibited CO₂ and CH₄ conversions of 98 and 92%, respectively. After serving for the DRM reaction for 100 h, the catalyst displayed CO₂ and CH₄ conversions of 94 and 85%, respectively, indicating the excellent durability of the herein synthesized catalyst. In addition, a small amount of carbon (3.1%) was deposited on the catalyst’s surface after the long-term reaction test. The insights obtained from this study may have broad applications in developing highly stable CoNi bimetallic catalysts for methane reforming reactions.