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Cho, Joon-Hyung,Jeon, Soo-Bin,Kang, Min-Kyoung,Kim, Jin-Seop,Cho, Sang-Won,Oh, Kwang-Joong Elsevier 2017 Separation and purification technology Vol.184 No.-
<P><B>Abstract</B></P> <P>Ion exchange technology is the most effective and economical to remove heat stable salts (HSS) in CO<SUB>2</SUB> absorption processes. However, the disadvantage of high waste generation remains an unsolved problem. This study attempted to reduce the amount of waste generated during the Zr(OH)<SUB>5</SUB> <SUP>−</SUP> regeneration process through resource recovery by using ZrCl<SUB>4</SUB> coagulant, then recycling the recovered Zr(OH)<SUB>4</SUB> precipitate to produce Zr(OH)<SUB>5</SUB> <SUP>−</SUP> regenerant. The experimental results showed a waste coagulant efficiency of about 75%. The coagulation mechanism was suggested based on the conductivity and zeta potential analysis. The recovered Zr(OH)<SUB>4</SUB> had no differences in terms of chemical composition and regeneration efficiency, when compared with virgin material. These results indicate that the recovery and recycling of Zr(OH)<SUB>4</SUB> from the waste stream using ZrCl<SUB>4</SUB> as a coagulant reduced a large amount of the waste generated from the ion exchange process.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Reduction efficiency using ZrCl<SUB>4</SUB> coagulant from ion exchange waste is about 75.0%. </LI> <LI> Coagulation mechanism of four stages with respect to the coagulant dose is proposed. </LI> <LI> Recovery efficiency of hydroxide, as Zr(OH)<SUB>4</SUB>, from the waste is about 99.2%. </LI> <LI> The recovered Zr(OH)<SUB>4</SUB> has no difference in regeneration efficiency of virgin material. </LI> </UL> </P>
Oh, Jungkyun,Lee, Jun Seop,Jun, Jaemoon,Kim, Sung Gun,Jang, Jyongsik American Chemical Society 2017 ACS APPLIED MATERIALS & INTERFACES Vol.9 No.45
<P>Dopamine (DA), a catecholamine hormone, is an important neurotransmitter that controls renal and cardiovascular organizations and regulates physiological activities. Abnormal concentrations of DA cause unfavorable neuronal illnesses such as Parkinson's disease, schizophrenia, and attention deficit hyperactivity disorder/attention deficit disorder. However, the DA concentration is exceedingly low in patients and difficult to detect with existing biosensors. In this study, we developed an organic field-effect transistor-type (OFET) nonenzyme biosensor using platinum nanoparticle-decorated reduced graphene oxide (Pt_rGO) for ultrasensitive and selective DA detection. The Pt_rGOs were fabricated by reducing GO aqueous solution-containing Pt precursors (PtCl4) with a chemical reducing agent. The Pt_rGOs were immobilized on a graphene substrate by pi-pi interactions and a conducting-polymer source-drain electrode was patterned on the substrate to form the DA sensor. The resulting OFET sensor showed a high sensitivity to remarkably low DA concentrations (100 X 10(-18) M) and selectivity among interfering molecules. Good stability was expected for the OFET sensor because it was fabricated without an enzymatic receptor, and pi-pi conjugation is a part of the immobilization process. Furthermore, the OFET sensors are flexible and offer the possibility of wide application as wearable and portable sensors.</P>
Oh, Chang Ho,Lee, Ji Ho,Lee, Sung Min,Yi, Hyun Jik,Hong, Chang Seop WILEY-VCH Verlag 2009 Chemistry Vol.15 No.1
<B>Graphic Abstract</B> <P>Good fusion: We describe the reactivity of Pt–carbene B, derived from enynals 1 via A, with Pt catalysts to afford fused cyclopropanes 2, which are obtained by insertion into the C&n.bond;H bond of the β position. Acid-catalyzed rearrangement of the cyclopropanes 2 smoothly occurred to form spiranes 3 (see scheme). <img src='wiley_img/09476539-2009-15-1-CHEM200801887-content.gif' alt='wiley_img/09476539-2009-15-1-CHEM200801887-content'> </P>
Processing of Nano-Sized Metal Alloy Dispersed Nanocomposites
Oh Sung-Tag,Seok Namkung,Lee Jai-Sung,Kim Hyoung-Seop,Tohru Sekino 한국분말야금학회 2001 한국분말야금학회지 Vol.8 No.3
An optimum route to fabricate the ferrous alloy dispersed nanocomposites such as /Fe-Ni and /Fe-Co with sound microstructure and desired properties was investigated. The composites were fabricated by the sintering of powder mixtures of and nano-sized ferrous alloy, in which the alloy was prepared by solution-chemistry routes using metal nitrates powders and a subsequent hydorgen reduction process. Microstructural observation of reduced powder mixture revealed that the Fe-Ni or Fe-Co alloy particles of about 20 nm in size homogeneously surrounded , forming nanocomposite powder. The sintered /Fe-Ni composite showed the formation of Fe phase, while the reaction phases were not observed in /Fe-Co composite. Hot-pressed /Fe-Ni composite showed improved mechanical properties and magnetic response. The properties are discussed in terms of microstructural characteristics such as the distribution and size of alloy particles.
Design of Fully Automatic Hydraulic Control Unit for Water Lever Harvesting System
Sang Min Oh(오상민),Sangu Kim(김상우),Sam Seop Song(송삼섭),Amarnathvarma(아마르나스바르마 앙가니),Kyoo jae Shin(신규재) 대한전자공학회 2019 대한전자공학회 학술대회 Vol.2019 No.6
Nowadays most peoples are used to collect a laver harvesting by human, it is very difficult working, due to wind, waves, and the weather conditions which is hard to stand on the ship and holding the seaweed nets it can be injured human, this is the reason we are developing an automatic harvesting method, in this project we proposed automatic harvesting collect method which is operated without human. Mainly we design and developed automated ship, This ship is divided in to three parts first part is supporting roller, second part is drum screener, third part is lifting mechanism. These are operated with hydro pneumatic equipment, this device are control with micro controller.
Oh, Ji Seop,Yu, Ho-Sung,Kang, Chang-Jong,Sinn, Soobin,Han, Moonsup,Chang, Young Jun,Park, Byeong-Gyu,Lee, Kimoon,Min, Byung Il,Kim, Sung Wng,Kim, Hyeong-Do,Noh, Tae Won American Chemical Society 2016 Chemistry of materials Vol.28 No.21
<P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/cmatex/2016/cmatex.2016.28.issue-21/acs.chemmater.6b03357/production/images/medium/cm-2016-033576_0006.gif'></P>
Non-deep physiological dormancy in seeds of Euphorbia jolkinii Boiss. native to Korea
Oh, Hye Jin,Shin, Un Seop,Lee, Seung Youn,Kim, Sang Yong,Jeong, Mi Jin The Ecological Society of Korea 2021 Journal of Ecology and Environment Vol.45 No.1
Background: Euphorbia jolkinii Boiss. is a perennial species native to Jeju Island and the southern coastal area of Korea. Particularly on Jeju Island, the yellow flowers of E. jolkinii Boiss. have a high ornamental value because of their contrast with basalt. This study was conducted to investigate the effects of different temperatures (5, 15, 20, and 25 ℃) and gibberellic acid (GA<sub>3</sub>) concentrations (0, 10, 100, or 1000 mg/L) on seed dormancy and germination of E. jolkinii. In addition, we classified the seed dormancy type and compared types with those of other species in the same genus. Results: The number of seeds with viable embryos and endosperms was approximately 66%. The final germination percentages at 5, 15, 20, and 25 ℃ were 51.7%, 83.5%, 2.6%, and 0.0%, respectively. In GA<sub>3</sub> concentration experiments, the final germination percentages of 0, 10, 100, and 1000 mg/L were 83.5%, 91.7%, 79.1%, and 83.4%, respectively, at 15 ℃ conditions, and 0.0%, 6.9%, 13.2%, and 27.3%, respectively, at 25 ℃. Conclusions: Germination improved at temperatures of 15 ℃ or lower. Furthermore, GA<sub>3</sub> treatment effectively reduced germination times. Thus, the seeds of E. jolkinni were classified as having non-deep physiological dormancy.
Oh, Sang Youn,Yoo, Dong Il,Shin, Younsook,Lee, Wha Seop,Jo, Seong Mu The Korean Fiber Society 2002 Fibers and polymers Vol.3 No.1
Cellulose carbonate was prepared by the reaction of cellulose pulp and $CO_2$ with treatment reagents, such as aqueous $Zncl_2$ (20-40 wt%) solution, acetone or ethyl acetate, at -5-$0^{\circ}C$ and 30-40 bar ($CO_2$) for 2 hr. Among the treatment reagents, ethyl acetate was the most effective. Cellulose carbonate was dissolved in 10% sodium hydroxide solution containing zinc oxide up to 3 wt% at -5-$0^{\circ}C$. Intrinsic viscosities of raw cellulose and cellulose carbonate were measured with an Ubbelohde viscometer using 0.5 M cupriethylenediamine hydroxide (cuen) as a solvent at $20^{\circ}C$ according to ASTM D1795 method. The molecular weight of cellulose was rarely changed by carbonation. Solubility of cellulose carbonate was tested by optical microscopic observation, UV absorbance and viscosity measurement. Phase diagram of cellulose carbonate was obtained by combining the results of solubility evaluation. Maximum concentration of cellulose carbonate for soluble zone was increased with increasing zinc oxide content. Cellulose carbonate solution in good soluble zone was transparent and showed the lowest absorbance and the highest viscosity. The cellulose carbonate and its solution were stable in refrigerator (-$5^{\circ}C$ and atmospheric pressure).
A case of Sweet`s syndrome associated with abdominal tuberculous lymphadenitis
( Sang-min Oh ),( Chang-seop Lee ),( Jeong-hwan Hwang ) 대한내과학회 2015 대한내과학회 추계학술대회 Vol.2015 No.1
Introduction: Sweet’s syndrome has been reported following infections of the upper respiratory tract and the gastrointestinal tract. However, association of tuberculosis (TB) with Sweet’s syndrome is extremely rare. Here we present a case of Sweet’s syndrome associated with abdominal tuberculous lymphadenitis. Case Report: A 76-year-old woman was admitted at emergency department because of fever and abdominal pain. On physical examination by emergency medical services personnel, she did not exhibit any unusual features, and the other vital signs were normal except for body temperature of 39.0℃. Abdominal computed tomography was performed, and the result revealed multiple lymphadenitis showing central low density and peripheral rim enhancement in retroperitoneum and both iliac chain. Therefore, she was diagnosed with tuberculous lymphadenitis using laparoscopic excisional biopsy. We started rifampin, ethambutol, isoniazid, and pyrazinamide for TB management, but rifampin was changed ciprofloxacin five days after the onset of antituberculous drugs because of increased serum creatinine and abnormal liver function test. Fourteen days after initiation of antituberculous drugs, fever up to 39.0℃and painful, purple nodules in trunk, both arms and legs developed newly.Laboratory findings showed a white blood cell of 17,100/mm3 (87% neutrophils), C-reactive protein of 145 mg/L. Skin biopsy was performed, and the result revealed the histopathologic findings accordant with Sweet’s syndrome. To exclude the malignancy, positron emission tomography-computed tomography was performed, and there was no evidence of malignancy except the findings of lymphadenopathy. Topical steroid cream was used maintaining tuberculosis treatment. About ten days later, skin lesion disappeared, and fever became alleviated. Two weeks after discharge, she was stable. Conclusions: We report a rare case of Sweet’s syndrome associated with abdominal tuberculous lymphadenitis. TB is associated with a variety of skin lesions. The clinicians should consider Sweet’s syndrome one among cutaneous manifestations of TB when leukocytosis, abrupt onset of fever, and tender erythematous nodule were observed.