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Copper Penetration of a Lance in a Smelting Furnace of the Mitsubishi Process
Sung‑Mi Lim,Kyung‑Woo Yi 대한금속·재료학회 2022 METALS AND MATERIALS International Vol.28 No.4
This study was aimed to determine the main cause of lance fracture in a smelting furnace of the Mitsubishi continuous processfor Cu production. Investigation of lances used in field operations, thermodynamic analysis and laboratory experiments wereconducted. By analyzing the lances, damaged surface of the lances and penetration of matte components into the lance wereobserved. The depth of damage was strongly dependent on the lance height which was related to temperature. To determinethe temperature of the lance fracture, thermodynamics calculations and laboratory experiments were conducted. Both resultsshowed that the formation of Cu liquids above 1100 °C could be the main cause of lance fracture during operation of Cusmelting furnaces of the Mitsubishi process.
Extension of Lance Life by Change of Height of Lances in the Smelting Furnace of Mitsubishi Process
Sung‑Mi Lim,Soo‑Sang Park,Kyung‑Woo Yi 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.10
A Mitsubishi process, which pertains to continuous Cu production, involves a smelting furnace, cleaning furnace, and convertingfurnace connected in series. One of the main issues pertaining to the smelting furnace is the frequent interruption ofoperations required to allow the inspection and replacement of lances, because lances are frequently fractured. The presentstudy was aimed at modifying the operating conditions of the smelting furnace to suppress lance fractures. A numericalmodel was developed to simulate the transport phenomena in the furnace, including multi-phase behaviors. The simulationresults showed that the lances were exposed to a severely erosive atmosphere with high temperatures. Further calculationindicated that raising the positions of the lances could lower the temperature of the lances, and reducing the occurrence ofsplashed melt, which contains erosive sulfides. The smelting furnace was operated under the conditions of the raised lanceheight and attentively monitored for several months. It was confirmed that by implementing such a change of the lanceheights, the occurrence of lance failures has been considerably reduced without notably affecting the reaction ability of thesmelting furnace.
Woo, Dae Gon,Ko, Chang-Yong,Kim, Han Sung,Seo, Jong Bum,Lim, Dohyung Pergamon Press [etc.] 2010 Annals of biomedical engineering Vol.38 No.7
<P>This study evaluated the possible clinical application of low-intensity ultrasound (LIUS) stimulation for preventing osteoporotic bone fracture. Eight virgin 14-week-old ICR mice (weight 24.0 +/- 0.7 g) were ovariectomized to induce osteoporosis. The right hind limbs (US limbs) were stimulated with LIUS, whereas the left hind limbs (CON limbs) were not stimulated. LIUS was applied for 20 min a day, 5 days a week over a 6-week period using the following parameters: 1.5 MHz frequency, 1.0 kHz pulse repetition, 30 mW/cm(2) intensity, and 200 mus pulse length. The effective structural modulus increased significantly (p < 0.05) in the US limbs over time with the increased bone quantity, whereas that in CON limbs remained statistically constant (p > 0.05). In addition, the elastic modulus in the US limbs was generally enhanced by an increased bone quality, compared with the CON limbs. Therefore, LIUS stimulation may effectively reduce the risk of osteoporotic bone fracture by increasing the mechanical characteristics of bone via improvements in both the effective structural and elastic modulus of the osteoporotic bone. In conclusion, LIUS may potentially prove very effective clinically for preventing osteoporotic bone fractures.</P>
Anemia after gastrectomy for early gastric cancer: long-term follow-up observational study.
Lim, Chul-Hyun,Kim, Sang Woo,Kim, Won Chul,Kim, Jin Soo,Cho, Yu Kyung,Park, Jae Myung,Lee, In Seok,Choi, Myung-Gyu,Song, Kyo-Young,Jeon, Hae Myung,Park, Cho-Hyun WJG Press 2012 WORLD JOURNAL OF GASTROENTEROLOGY Vol.18 No.42
<P>To identify the incidence and etiology of anemia after gastrectomy in patients with long-term follow-up after gastrectomy for early gastric cancer.</P>
Basic Techniques of Intraoperative Neurophysiological Monitoring
( Sang-ku Park ),( Soon-chul Hyun ),( Sung-hyuk Lim ),( Chan-woo Park ),( Jin-woo Park ),( Dong-jun Kim ),( Wan-soo Choi ),( Gi-bong Kim ) 대한임상검사과학회 2013 대한임상검사과학회지(KJCLS) Vol.45 No.2
Intraoperative Neurophysiological Monitoring (INM) is very useful in monitoring the motorsensory pathway and vascular circulation system during intraspinal, or intracranial neurosurgery. Brainstem Auditory Evoked Potentials (BAEPs) are for detecting the problems along the auditory pathways including, the eighth cranial nerve and brainstem. Motor Evoked Potentials (MEPs) is a useful adjunct to conventional monitoring of Somato-sensory Evoked Potentials (SEPs) during surgery. Visual Evoked Potentials (VEPs) has been regarded as having limited significance for the preservation of visual function during neurosurgical procedures. In this paper, we propose that the most appropriate averaging of the number of inspections in the inspection of each used in the operative field, is good and efficient, functionally.
Comparison of the Capability of proprioception perception between collegiate golfer and non-golfer
Lim, Young-Tae,Park, Jun-Sung,Lee, Jae-Woo,Kwon, Moon-Seok The Korean Society of Applied Science and Technolo 2018 한국응용과학기술학회지 Vol.35 No.3
The purpose of this study was to verify prprioception perception and compare between collegiate golfers and non-golfers using tilting platform. Thirty golfers and twenty-eight non-golfers were participated. All participants were performed perception test on the tilting platform. Frequency analysis was performed using SPSS(ver. 24.0) to determine the perception response according to the grade, and performed using independent t-test. Most participants were perceived from $1^{\circ}$ to $2^{\circ}$ of slopes and perceived left-right slope than forward-backward slope. Repeated practice such as walking on the uneven ground or standing on sloped ground might help to improve proprioception perception. Future research using a tilting platform will be to develop the training program.
Relationship between Stability Degree and Chemical Indices of Livestock Manure Composts
Lim, Sang-Sun,Choi, Woo-Jung,Ro, Hee-Myong The Korean Society for Applied Biological Chemistr 2012 Applied Biological Chemistry (Appl Biol Chem) Vol.55 No.4
Principal chemical indices of compost associated with compost stabilization were investigated using relationship between stability degree (SD) and chemical indices including pH, electrical conductivity (EC), total C, extractable C, decomposability, total N, $NH{_4}^+$, $NO{_3}^-$, molar ratio of $NH{_4}^+$ to $NO{_3}^-$, C/N, total P, and soluble P of various composts. Compost SD was positively (p<0.05) correlated with pH and C/N, and negatively (p<0.05) with EC, total N, and molar ratio of $NH{_4}^+$ to $NO{_3}^-$. However, the correlation with pH, C/N, and total N were in contradiction to other studies that reported an opposite relationship to ours, probably due to different properties of initial composting materials. Therefore, the present study in conjunction with other studies suggest that EC and the molar ratio of $NH{_4}^+$ to $NO{_3}^-$ are the chemical indices closely associated with stabilization of composts regardless of composting materials.