http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
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.
Sang‑Wook Kim,Hyeon‑Woo Son,Taek‑Kyun Jung,Young‑Bum Chun,Yi‑Hyun Park,Ji‑Woon Lee,Soong‑Keun Hyun 대한금속·재료학회 2019 METALS AND MATERIALS International Vol.25 No.4
The hot deformation behavior of advanced reduced-activation alloy (ARAA) was investigated using hot torsion tests. Thefl ow stress decreased as deformation temperature increased and as strain rate decreased. The fl ow behavior demonstratedthe typical dynamic recrystallization (DRX). Based on the constitutive analysis of peak stress, the activation energy for hotdeformation was found to be 330.3 kJ mol −1 . Peak stress was analyzed as a function of the Zener–Hollomon parameter, andcalculated and experimental values were in good agreement. A DRX kinetic model for ARAA was derived with deformationconditions based on the Avrami-type model. It was confi rmed that the volume fraction of dynamically recrystallized grainsincreased as deformation temperature increased and as strain rate decreased. The necklace structure and grain boundarybulging were observed in the deformed microstructure of ARAA. The suggested DRX mechanism for ARAA during hotworking is discontinuous DRX.
Sang-Duk Yi,Si-Ho Woo,Jae-Seung Yang 한국식품영양과학회 2001 Preventive Nutrition and Food Science Vol.6 No.3
Accumulated photon counts in immediate measurement after irradiation of marjoram, basil and thyme were shown to he below 625±162, 577±178 and 126±640 Pc, respectively. The accumulated photon counts increased linearly with increasing irradiation doses up to 5 k㏉ and slightly increased from 5 k㏉ to 10 k㏉. This trend was similar after storage periods. According to storage conditions, the difference of the accumulated photon counts was not clearly observed. The accumulated photon counts of irradiated spice samples decreased with increasing storage periods. The rate of decrease was higher in 5 and 10 k㏉ irradiated samples than that in 1 k㏉, and in room conditions than that in darkroom conditions. The photon counts of the irradiated spice samples measured for 120 s were higher than those measured for 60 s. The irradiated spice samples showed higher photon counts than those of unirradiated samples in both room and darkroom conditions during all the storage periods. These results indicate that detection of irradiation was still possible after 24 weeks, although the PPSL signal of all spice samples decreased with increasing storage times.
A New Structure and Driving Scheme of PDP for High Luminous Efficacy
Yi, Jeong-Doo,Kim, Joon-Yeon,Chae, Su-Yong,Kim, Tae-Woo,Cho, Sung-Chun,Chun, Byoung-Min,Kim, Jeong-Nam,Cho, Yoon-Hyoung The Korean Infomation Display Society 2004 Journal of information display Vol.5 No.2
We have developed a new PDP cell structure called MARI(Multi Anode for Reduction of Ionic effect) and new driving scheme achieving a high luminous efficacy. The MARI PDP has middle electrode inserted between X and Y main electrodes. In the MARI PDP, reset and scan voltage is applied to middle electrode and sustain voltage is applied to X and Y electrode. Using a long gap sustain discharge we accomplished a high luminous efficacy. And we developed 42"full panel adopting MARI structure and new driving scheme and attained luminous efficacy of 2.35 lm/W.
Yi, Ha Woo,Kim, Su Mi,Kim, Sang Hyun,Shim, Jung Ho,Choi, Min Gew,Lee, Jun Ho,Noh, Jae Hyung,Sohn, Tae Sung,Bae, Jae Moon,Kim, Sung The Korean Gastric Cancer Association 2013 Journal of gastric cancer Vol.13 No.4
Purpose: Reoperations after gastrectomy for gastric cancer are performed for many types of complications. Unexpected reoperations may cause mental, physical, and financial problems for patients. The aim of the present study was to evaluate the causes of reoperations and to develop a strategic decision-making process for these reoperations. Materials and Methods: From September 2002 through August 2010, 6,131 patients underwent open conventional gastrectomy operations at Samsung Medical Center. Of these, 129 patients (2.1%) required reoperation because of postoperative complications. We performed a retrospective analysis of the patients using an electronic medical record review. Statistical data were analyzed to compare age, sex, stage, type of gastrectomy, length of operation, size of tumor, and number of lymph node metastasis between patients who had been operated and those who had not. Results: The variables of age, sex, tumor stage, type of gastrectomy, length of operation, and number of lymph node metastases did not differ between the 2 groups. However, the mean tumor size in the reoperation group was greater than that in the non-reoperation group ($5.0{\pm}3.7$ [standard deviation] versus $4.1{\pm}2.9$, P=0.007). The leading cause of reoperation was surgical-site infection (n=49, 0.79%). Patients with intra-abdominal bleeding were operated on again in the shortest period after the initial gastrectomy ($6.3{\pm}4.2$ days). Patients with incisional hernia were not reoperated on until after $208.3{\pm}81.0$ days, the longest postoperative period. Conclusions: Tumor size was the major variable leading to reoperation after gastrectomy for gastric cancer. The most common complication requiring the reoperation was a surgical site-related complication.
Sung, Yun-Hee,Chang, Hyun-Kyung,Kim, Sung-Eun,Kim, You-Mi,Seo, Jin-Hee,Shin, Min-Chul,Shin, Mal-Soon,Yi, Jae-Woo,Shin, Dong-Hoon,Kim, Hong,Kim, Chang-Ju The Korean Society of Food Science and Nutrition 2009 Journal of medicinal food Vol.12 No.4
Corni fructus is the fruit of Cornus officinalis Sieb. et Zucc, which is classified into the dogwood family of Cornaceae. Corni fructus has antineoplastic, antioxidative, and antidiabetic effects, but its anti-inflammatory and analgesic effects are unknown. Here, we investigated the anti-inflammatory and analgesic effects of an aqueous extract of corni fructus using murine RAW 264.7 macrophage cells. For this study, we used the 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide assay, western blot analysis, prostaglandin (PG) $E_2$ immunoassay, and nitric oxide (NO) detection. In addition, the analgesic effect of corni fructus was assessed by the acetic acid-induced writhing response in mice. The aqueous extract of corni fructus suppressed $PGE_2$ synthesis and NO production by inhibiting the lipopolysaccharide-induced expression of cyclooxygenase (COX)-2 and inducible NO synthase (iNOS) in murine RAW 264.7 macrophage cells. The extract also suppressed increases in nuclear factor-${\kappa}B$ (NF-${\kappa}B$) levels in the nucleus. In vivo study showed that the extract suppressed the acetic acid-induced writhing response in mice. The aqueous extract of corni fructus exerts anti-inflammatory and analgesic effects by suppressing COX-2 and iNOS expression through the down-regulation of NF-${\kappa}B$ binding activity.