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Oxidizing Capacity of Periodate Activated with Iron-Based Bimetallic Nanoparticles
Lee, Hongshin,Yoo, Ha-Young,Choi, Jihyun,Nam, In-Hyun,Lee, Sanghyup,Lee, Seunghak,Kim, Jae-Hong,Lee, Changha,Lee, Jaesang American Chemical Society 2014 Environmental science & technology Vol.48 No.14
<P>Nanosized zerovalent iron (nFe<SUP>0</SUP>) loaded with a secondary metal such as Ni or Cu on its surface was demonstrated to effectively activate periodate (IO<SUB>4</SUB><SUP>–</SUP>) and degrade selected organic compounds at neutral pH. The degradation was accompanied by a stoichiometric conversion of IO<SUB>4</SUB><SUP>–</SUP> to iodate (IO<SUB>3</SUB><SUP>–</SUP>). nFe<SUP>0</SUP> without bimetallic loading led to similar IO<SUB>4</SUB><SUP>–</SUP> reduction but no organic degradation, suggesting the production of reactive iodine intermediate only when IO<SUB>4</SUB><SUP>–</SUP> is activated by bimetallic nFe<SUP>0</SUP> (e.g., nFe<SUP>0</SUP>–Ni and nFe<SUP>0</SUP>–Cu). The organic degradation kinetics in the nFe<SUP>0</SUP>–Ni(or Cu)/IO<SUB>4</SUB><SUP>–</SUP> system was substrate dependent: 4-chlorophenol, phenol, and bisphenol A were effectively degraded, whereas little or no degradation was observed with benzoic acid, carbamazepine, and 2,4,6-trichlorophenol. The substrate specificity, further confirmed by little kinetic inhibition with background organic matter, implies the selective nature of oxidant in the nFe<SUP>0</SUP>–Ni(or Cu)/IO<SUB>4</SUB><SUP>–</SUP> system. The comparison with the photoactivated IO<SUB>4</SUB><SUP>–</SUP> system, in which iodyl radical (IO<SUB>3</SUB><SUP>•</SUP>) is a predominant oxidant in the presence of methanol, suggests IO<SUB>3</SUB><SUP>•</SUP> also as primary oxidant in the nFe<SUP>0</SUP>–Ni(or Cu)/IO<SUB>4</SUB><SUP>–</SUP> system.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/esthag/2014/esthag.2014.48.issue-14/es5002902/production/images/medium/es-2014-002902_0008.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/es5002902'>ACS Electronic Supporting Info</A></P>
Sanghyup Lee,신경호,Jun-Su Lee,이태진,Da-Min Sim,정동수,Hoon Jung,Joo-Hyung Kim 대한기계학회 2020 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.34 No.1
In this review work, energy harvesting methods for waste heat with small temperature differences between heat source and sink are discussed. At present, many methods are tried and employed to utilize this type of waste heat. A typical example is found in a conventional power generation system. By utilizing this type of waste heat, additional energy can be produced in regular power generation systems. Up to this point, two energy harvesting methods have been introduced and applied for the use with this type of waste heat. One is a method using an organic Rankine cycle (ORC) while the other is a method using a thermoelectric generation (TEG). An ORC is a Rankine cycle that can be applied to this type of waste heat using organic fluids such as refrigerants as working fluids instead of water used in a typical Ranking cycle. On the other hand, a TEG utilizes Peltier, Seebeck, and Thomson effects caused by the temperature difference between the heat source and sink for energy harvesting. In this work, various aspects associated with the use ORC and TEG for waste heat harvesting with small temperature differences between the heat source and sink.
Effects of Subcutaneous Methotrexate in Patients with Refractory Uveitis and Chorioretinitis
Sanghyup Lee,Hun Gu Choo,Oh Woong Kwon,Yong Sung You 대한안과학회 2023 Korean Journal of Ophthalmology Vol.37 No.6
Purpose: Methotrexate (MTX) is an immunosuppressive agent used to treat noninfectious inflammatory eye conditions and is generally administered orally for ocular inflammatory diseases. When used in rheumatological diseases, subcutaneous administration has been reported to show higher efficacy than oral administration. Therefore, this study aimed to evaluate the effect of subcutaneous MTX in patients with refractory uveitis or choroiditis who did not respond to other immunosuppressive agents. Methods: A retrospective case series study was performed between January and December 2018. Patients with uveitis or chorioretinitis who showed little to no treatment response for 6 months or more with conventional immunosuppressive agents were treated with MTX, administered subcutaneously. After 6 months of treatment, patients were evaluated to determine whether complete suppression of inflammation sustained for ≥28 days was achieved in both eyes and whether improvement can be confirmed by fluorescein angiography (FAG). Results: Subcutaneous MTX treatment was performed on 18 patients: 11 had intermediate uveitis and seven had posterior uveitis. In the intermediate uveitis patient group, five patients (50% of the group excluding one patient who dropped out) showed improvement in FAG and three patients (30%) showed complete suppression of inflammation. In the posterior uveitis group, two out of seven patients (excluding two patients who dropped out) showed an improvement, two patients in the group showed little change, and one patient showed aggravation of FAG findings. Conclusions: The study confirmed that in patients with uveitis or chorioretinitis who had a refractory response to treatment with other immunosuppressive agents, subcutaneous MTX showed improved treatment efficacy.
이상협(Sanghyup Lee),김지온(Jion Kim),문일경(Ilkyeong Moon) 대한산업공학회 2011 대한산업공학회지 Vol.37 No.3
At a shipyard, the efficient handling of blocks is one of the most important factors in the shipbuilding process. We consider the problem of deployment planning of blocks from storage yards. As some information of block arrangement should be considered to handle the problem, we adopt the block arrangement based on the coordinates and sizes of each block at a storage yard. Deployment planning for a block involves deciding upon its transportation route from the storage yard and searching for blocks that would obstruct its transportation along this route. A tabu search algorithm for deploying several blocks is developed to minimize the number of obstructive blocks deployed together from the storage yards at a shipyard. The results of computational experiments show that the developed algorithm is very useful in the deployment planning of multiple blocks from the storage yards.
메탄/공기 예혼합 화염의 Hydroxyl Radical을 이용한 Pyrometer 온도 보정방법에 대한 연구
이상협(Sanghyup Lee),임지환(Jihwan Lim),노관영(Kwanyoung Noh),이도형(Dohyung Lee),윤웅섭(Woongsup Yoon) 한국추진공학회 2013 한국추진공학회 학술대회논문집 Vol.2013 No.12
본 연구에서는 상용 Pyrometer를 화염온도 측정에 적용할 수 있도록 메탄/공기 예혼합 화염을 이용하여 온도 보정기법을 개발하였다. 메탄/공기 예혼합 화염의 온도는 기 개발한 OH radical을 이용한 방출 스펙트럼 비교법을 사용하여 정밀하게 측정하였고 Pyrometer 측정결과와 비교하여 보정계수를 도출하였다. 이를 이용하여 온도를 알고 있는 메탄/공기 예혼합 평면 화염 버너를 이용하여 온도 측정결과를 검증하였고 잘 일치함을 확인하였다. In this study, in order to apply the commercial pyrometer to measurement of the flame temperature, methane / air premixed flame temperature calibration method was developed. Methane / air premixed flame temperature was precisely measured by using comparison technique of OH radical emission spectra. It was compared with pyrometer measurement result and then we calculated correction factor. With this method, the temperature measurement result was verified by methane / air premixed flat-flame burner whose temperature was already known. We confirmed that both were in good agreement.