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Effect of Mn and C on Age Hardening of Fe–Mn–Al–C Lightweight Steels
Sung‑Won Park,Jun Young Park,Kyong Mox Cho,Jae Hoon Jang,Seong‑Jun Park,Joonoh Moon,Tae‑Ho Lee,Jong‑Ho Shin 대한금속·재료학회 2019 METALS AND MATERIALS International Vol.25 No.3
The effects of Mn and C content on the age hardening of Fe–Mn–Al–C lightweight steels, which have austenitic or duplex(austenite and ferrite) microstructures, were investigated. An increase in Mn content induced a delay of the age hardeningthat is caused by the formation of intra-granular κ-carbides. In order to interpret the effect of Mn content, first-principlescalculations were conducted using the supercells of Fe24Al8C8,Fe24Al8C7,Fe24(Al7Mn)C8, and Fe24(Al7Mn)C7. The calculationsshowed that an increase in Mn content could be the source of the delay of the intra-granular κ-carbide formation bysuppressing C atom’ occupation of the vacancy at the body-centered site of L12. An increase in C content accelerated theformation of intra-granular κ-carbides, which induced the intense age hardening, and coarse inter-granular κ-carbides, whichresulted in significant decrease in impact absorbed energy due to inter-granular fracture.
Moon, Kyung-Man,Lee, Myung-Hoon,Kim, Ki-Joon,Park, Guen-Hyun,Koh, Sung-Cheol 韓國海洋大學校 附設 海洋科學技術硏究所 2002 硏究論文集 Vol.11 No.1
We have investigated the differences between the general corrosion and microbiological influenced corrosion (MIC) of a steel in terms of electrochemical behavior and surface phenomena. Corrosion potential of a steel in medium solution without SRB (Sulphate Reducing Bacteria) shifted to a low direction continuously as a function of submerging time. The potential caused by MIC with SRB shifted to a noble direction after 20days' incubation, indication the growth of SRB biofilm and the test metal specimens and a formation of corrosion product. In addition, the color of medium inoculated with SRB changed from grey to black., the color change was observed in the medium without SRB inoculation. Moreover, corrosion rated of a steel in MIC were higher than those is the absence of SRB. This is probably because SRB caused be associated with the increasing corrosion rates through increasing cathodic reaction which caused the reducing sulfate to sulphide as well as formation of an oxygen concentration cell. The pitting corrosion was also observed in the of SRB inoculated medium.
Moon, Cheul-Hyun,Lee, Eun-Yeol,Park, Sung-Hoon 한국생물공학회 2010 Biotechnology and Bioprocess Engineering Vol.15 No.3
A biotrickling filter (BTF) packed with porous polyurethane (PU) foam sheets was developed and operated for removal of gas-phase styrene. The specific surface area and void fraction of the PU foam sheet were determined to be 497 $m^2/m^3$ and 0.92, respectively, by using mathematical modeling and experimental measurement. The effects of gas flow direction (co-current and counter-current), styrene loading rate and empty bed residence time on the efficiency of the BTF were analyzed. The BTF achieved a high elimination capacity of 4.0 ~ 5.0 kg styrene/$m^3$day due to the high specific surface area of the PU foam. The BTF could be operated repeatedly when excessively-grown biomass was periodically removed, using circulating NaOH solution for 2 h every four days.
Moon, Kyeong-Ju,Lee, Tae Il,Lee, Sang-Hoon,Myoung, Jae-Min The Royal Society of Chemistry 2014 Chemical communications Vol.50 No.31
<P>A partial composite consisting of rough silicon nanowires and a polymer dielectric layer with sufficient Na<SUP>+</SUP> ions was used to create a field-effect transistor based memory device. Addition of Na<SUP>+</SUP> ions helped compensate for water molecule trapped charges leading to narrow hysteresis characteristics and stable memory retention stability of the resulting device.</P> <P>Graphic Abstract</P><P>A partial composite consisting of rough silicon nanowires and a polymer dielectric layer with sufficient Na<SUP>+</SUP> ions was used to create a field-effect transistor based memory device. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c4cc00749b'> </P>
Solitary fibrous tumor/hemangiopericytoma: treatment results based on the 2016 WHO classification
Sung, Kyoung Su,Moon, Ju Hyung,Kim, Eui Hyun,Kang, Seok-Gu,Kim, Se Hoon,Suh, Chang-Ok,Kim, Sun Ho,Lee, Kyu-Sung,Chang, Won Seok,Chang, Jong Hee Journal of Neurosurgery Publishing Group 2019 Journal of Neurosurgery Vol.130 No.2
<B>OBJECTIVE</B><P>Solitary fibrous tumor/hemangiopericytoma (SFT/HPC) is a new combined entity for which a soft-tissue-type grading system, ranging from grades I to III, has been introduced in the 2016 WHO classification of tumors of the CNS. The results of the treatment of this new disease entity require evaluation.</P><B>METHODS</B><P>The authors retrospectively reevaluated the pathological findings and medical records of patients with SFT/HPC. This study included 60 patients (27 men and 33 women, median age 42.5 years, range 13-69 years) treated at Severance Hospital between February 1981 and February 2016. Four, 40, and 16 patients were categorized as having SFT/HPC grades I, II, and III, respectively. Among these patients, SFTs diagnosed in 7 patients were regraded as grades I (n = 4), II (n = 2), and III (n = 1).</P><B>RESULTS</B><P>The median overall survival (OS) was 73.2 months (range 1.4-275.7 months), and the progression-free survival (PFS) after the first operation was 53.8 months (range 1.4-217.7 months). Six patients (10%) showed extracranial metastasis during a median period of 103.7 months (range 31.9-182.3 months). Nineteen patients (31.7%) presented with tumor recurrences. The patients in the grade III group had shorter PFS and OS, as well as a shorter period to extracranial metastasis, compared with patients in the grade II group. In the grade II group, patients who underwent gross-total resection showed longer PFS than those who underwent subtotal resection; however, there was no difference in OS. Patients who underwent adjuvant radiation therapy (RT) after surgery had longer PFS compared with that of patients who did not undergo adjuvant RT.</P><B>CONCLUSIONS</B><P>The SFT/HPC grade I group showed a relatively benign course compared with those of the other groups. The grade III group presented a course with a more aggressive nature than that of the grade II group. In the grade II group, the extent of resection and adjuvant RT was significantly associated with longer PFS. The long-term follow-up and periodic systemic evaluation are mandatory to detect systemic metastasis.</P>
( Sang Hyun Song ),( Choon Hyuck David Kwon ),( Jae Won Joh ),( Jong Man Kim ),( Milljae Shin ),( Sung Joo Kim ),( Suk Koo Lee ),( Tae Suk Kim ),( Hyung Hwan Moon ),( Sang Hoon Lee ) 대한간학회 2012 춘·추계 학술대회 (KASL) Vol.2012 No.1
Background: Portal vein thrombosis (PVT) is a surgical challenge in liver transplantation (LTx). Presence of PVT was considered as a contraindication for LTx in some centers due to the controversy revolving around the long term outcome of these patients. Therefore, we studied the long term outcome of adult patients with PVT in LTx in a tertiary institution with specialized transplantation unit. Methods: There were 570 cases of adult liver transplantation between 2004 and 2009 in our institution. We excluded 99 cases of deceased donor liver transplantations to facilitate incidence, outcome and surgical management. There were 56 patients with existing PVT before 471 living donor liver transplantations. Patients with PVT were divided into 2 groups according to Yerdal’s classification, mild PVT group (Yerdel group 1 & 2) 43 cases and severe PVT group (Yerdel group 3 & 4) 13 cases. Results: Patients with PVT constituted 11.8% (n=56) in our cohort. When comparing between patients without and with PVT, we did not find statistical difference in terms of age, gender, Child-Pugh score, MELD score & indication for LTx (benign vs malignancy). Rate of PV complication was 3.4% in the non-PVT group and 8.9% in PVT group (p=0.047). Duration of operation and total amount of blood transfusion were also comparable between two groups. The overall survival of PVT group was not significantly different compared to the non-PVT group (p=0.059). Demographics of 43 cases of mild PVT (76.7%) and 13 cases of severe PVT (23.3%) were not different except in severe PVT group had more malignancy cases (27 cases vs 2 cases, p=0.011). The median overall survival of mild PVT group is comparable with non-PVT group (p=0.059) and the median overall survival of severe PVT group is 32 months (1-88) and non-PVT group is 41 months (1-93) (p=0.066). 5-year survival rate of severe PVT is about 60%. Conclusions: Existing PVT prior to liver transplantation does not lead to poorer long term outcome. However in severe cases, we need more careful approach. Therefore, PVT should not be a
Rate of Endometritis in Non-pregnant Jeju Cross Breed and Jeju Horses
Sang Min Shin,Jun Kyu Son,Byoung Chul Yang,Nam Young Kim,Jae Hoon Woo,Moon Cheol Shin,Ji Hyun Yoo 한국동물생명공학회(구 한국동물번식학회) 2018 발생공학 국제심포지엄 및 학술대회 Vol.2018 No.06
Endometritis is inflammation of the endometrium. Endometritis by breeding is major cause of infertility. The incidence of bacterial uterine infections has been reported to be 25~60% in mares. Mares show acute inflammatory response by semen after mating, which is charaterized by the influx of neutrophils, which are important in the physiological defense mechanism. The normal uterine inflammatory response in mare disappears within 48 hours after mating, but if inflammation persists, this is expressed as persistent post breeding endometritis (PPBE). Chronic endometritis is caused by bacteria and although the condition may have stemmed from PPBE. The diagnosis of endometritis is used three methods (ultrasonography, cytological and bacteriological examination, histology). This study was conducted in non-pregant mares(Jeju cross breed and Jeju horses) raised at Subtrophical Livestock Research Institute between 2016 and 2017. The non-pregnant mares with endometritis was diagnosed by ultrasonography, cytological and bacteriological examination used EQUIVET uterine culture swab (KRUUSE, Denmark). The rate of non-pregnancy was 9.16% (11/120) and the percentage diagnosed with endometritis of non-pregnancy mares was 18.18% (2/11).