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.

A Multi-Center Educational Research Regarding Breastfeeding for Pediatrics Residents in Korea

Yong Sung Choi,정성훈,김은선,Eun Sun Kim,Eunhee Lee,Euiseok Jung,So-Yeon Lee,이우령,Hye Sun Yoon,Yong Joo Kim,Ji Kyoung Park,Son Moon Shin,Ellen Ai-Rhan Kim 대한신생아학회 2022 Neonatal medicine Vol.29 No.1

Purpose: Pediatricians have a significant responsibility to educate mothers about the importance of breastfeeding. However, there have been minimal efforts in the courses of resident training in Korea. The purpose of this study is to evaluate the change in knowledge and attitude before and after a 4-week breastfeeding educational intervention among multicenter residents. Methods: Prospective interventional educational research was designed for residents at eight training hospitals in Korea. Institutional reviews were obtained in each hospital. The education curriculum consisted of 14 courses regarding breastfeeding theory and practice. These materials were used to teach pediatric residents for 4 weeks. Knowledge-based tests were administered before the course, and re-tests were administered after the course using different test items of similar levels. Test scores and survey responses were compared before and after the intervention. Results: A total of 73 residents (1st year 20, 2nd year 23, 3rd year 16, and 4th year residents 14) from eight training hospitals completed the intervention. Their average age was 30.3±2.9 years, 17 (23.3%) were male, 22 (30.1%) were married, and eight had more than one child of their own. The mean pre-test score was 61.8±13.4 and the mean post-test score was 78.3±7.5 (P<0.001). The inter-grade difference in the score was significant in the pre-test (P=0.005), but not significant in the post-test (P=0.155). There were more responses of obtaining confidence after the intervention (P<0.001). Conclusion: In our study, pediatric residents showed improvement in their knowledge and confidence level after 4 weeks of the breastfeeding curriculum. This will provide a basis for future policymaking in the training of pediatric residents regarding breastfeedReceived: 6 January 2022 Revised: 15 February 2022 Accepted: 15 February 2022 Correspondence to: Ellen Ai-Rhan Kim, MD Department of Pediatrics, Asan Medical Center, University of Ulsan College of Medicine, 88 Olympic-ro 43-gil, Songpa-gu, Seoul 05505, Korea Tel: +82-2-3010-3390 Fax: +82-2-3010-6978 E-mail: arkim@amc.seoul.kr A Multi-Center Educational Research Regarding Breastfeeding for Pediatrics Residents in Korea Yong-Sung Choi, MD,PhD1, Sung-Hoon Chung, MD, PhD2, Eun Sun Kim, MD, PhD3, Eun Hee Lee, MD4, Euiseok Jung, MD5, So Yeon Lee, MD, PhD5, Wooryoung Lee, MD6, Hye Sun Yoon, MD, PhD7, Yong Joo Kim, MD, PhD8, Ji Kyoung Park, MD, PhD9, Son Moon Shin, MD, PhD9, and Ellen Ai-Rhan Kim, MD, PhD5 1Department of Pediatrics, Kyung Hee University Hospital, Seoul, Korea 2Department of Pediatrics, Kyung Hee University Hospital at Gangdong, Seoul, Korea 3Department of Pediatrics, Kangwon National University Hospital, Chuncheon, Korea 4Department of Pediatrics, Korea University Anam Hospital, Seoul, Korea 5Department of Pediatrics, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea 6Department of Pediatrics, Soonchunhyang University Seoul Hospital, Seoul, Korea 7Department of Pediatrics, Nowon Eulji Medical Center, Eulji University, Seoul, Korea 8Department of Pediatrics, Hanyang University Seoul Hospital, Seoul, Korea 9Department of Pediatrics, Inje University Busan Paik Hospital, Busan, Korea Neonatal Med 2022 February;29(1):28-35 https://doi.org/10.5385/nm.2022.29.1.28 pISSN 2287-9412 . eISSN 2287-9803 Copyright(c) 2022 By Korean Society of Neonatology This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http:// creativecommons.org/licenses/by-nc/4.0), which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited. Original Article 29 Neonatal Med 2022 February;29(1):28-35 https://doi.org/10.5385/nm.2022.29.1.28 ing in Korea.

근막 결손의 복원과 자궁천골인대 고정을 통한 전자궁적출술 후 질탈출의 성공적 교정

문화숙(Hwa Sook Moon),최진국(Jin Koo Choi),김경서(Kyung Seo Kim),박근식(Kyun Sik Park),황지영(Ji Young Hwang),문성은(Sung Eun Moon),한지원(Ji Won Han),김상국(Sang Gook Kim),김상갑(Sang Gap Kim) 대한산부인과학회 2002 Obstetrics & Gynecology Science Vol.45 No.7

목적 : 본 연구는 전자궁적출술 후 질탈출을 부위-특이적인 결함의 개념에 입각하여 치골경부 근막과 직장질 격막의 연결을 통한 골반내 근막의 복원과 자궁천골인대 고정술을 이용한 질탈출의 성공적인 수술적 교정의 방법과 결과를 보고하고자 한다. 연구 방법 : 1999년부터 2001년 8월까지 자궁적출술 후 질궁탈출 증상으로 문화병원 산부인과를 내원, 탈출된 질의 근막을 재건시킨 다음, 이를 자궁천골인대에 고정시킴으로써 질의 부위-특이적인 교정술을 받은 3명의 환자를 대상으로 하였다. 3명중 1명은 개복술을 하였고 2명은 내시경 수술을 하였다. 결과 : 환자의 연령 분포는 49-67세였으며, 수술시간은 평균 113분 (105-125)이었다. 세 환자 모두 수술 후 질의 상태가 해부학 및 기능적으로 정상이었으며, 9일째 특이사항 없이 퇴원하였다. 수술 후 HRT를 시행한 1명을 포함한 3명 모두 각각 24개월, 12개월, 7개월간의 추적 검사에서도 특이한 합병증이나 재발 없이 좋은 경과를 보였다. 결론 : 골반 근막 결손의 복원과 자궁천골인대 고정술은 전자궁적출술 후 질탈출의 교정에 매우 안전하고 효과적이며, 기능적인 방법으로 사료되며, 자궁천골인대를 질탈출 교정에 이용한 연구는 본 연구가 국내에서 처음이다. Objective : To report the method and efficacy of the site specific-defects repair in the endopelvic fascia and uterosacral ligament suspension for the correction of posthysterectomy vaginal vault prolapse. Methods : This study was performed in 3 patients with posthyterectomy vaginal vault prolapse who underwent the surgery for the reconstruction of endopelvic fascia and the correction of vault prolapsed vagina by using uterosacral ligament suspension at the department of Obstetrics and Gynecology in Moon-Hwa Hospital. Among them, 1 patient was treated by laparotomy, and 2 patients were treated by laparoscope. Results : The age of patients ranged from 49 to 67 years. The mean operation time was 111 minutes (105-120 minutes). The status of postoperative vagina was normal in all 3 patients, who were discharged 9 days after operation without symptoms. No complication or recurrence were found in them despite long-term follow-up for 24 months, 12 months, 7 months, respectively after operation. One patient has been treated with HRT therapy. Conclusion : The reconstruction of the defect of endopelvic fascia and uterosacral ligament fixation may be very safe, effective, and functional in the correction of vaginal vault prolapse. This study reports the treatment of vaginal vault prolapse using uterosacral ligament within Korea for the first time.

바이모달 트램의 위치 인식 방법 및 정밀 정차 구현

서기원(Seo Ki-Won),박주연(Park Ju-Yeon),이상남(Lee Sang-Nam),류희문(Ryu Hee-Moon),변윤섭(Byun Yeun-Sub) 한국철도학회 2009 한국철도학회 학술발표대회논문집 Vol.2009 No.5월

This paper presents a method for precisely localizing and parking of bimodal trams. In order to gain an automatically driving system for bimodal trams, precise up-to-date localization, velocity recognition, distance to next station and precise parking location estimation functions are required. This paper proposes a system consisting of control device, steering device, sensor input equipment, driving system, tachometer, vehicle-side sensors, magnetic markers and magnetic sensors. The tram recognizes the precise location via magnetic markers containing information. Parking position and precise distance calculation is embodied by a tachometer. The vehicle-side sensors are used to assure safe station approaching and parking magnetic markers provide improvement of precision while tram parking. This paper provides a system realizing localization and precise parking and afterwards the automatic drive test results are reported and analyzed.

Purification and Partial Characterization of the Storage Protein-like Protein from the 5th Instar Larval Haemolymph of the Chinese Oak Silkworm, Antheraea pernyi .

Park, Nam Suk,Lee, Sang Mong,Moon, Jae Yu,Seong, Su Il 한국잠사학회 1999 한국잠사곤충학회지 Vol.41 No.2

The storage protein-like protein has been purified from the 5th instar larval haemolymph of the Chinese oak silkworm, Antheraea pernyi, and the preparation was shown to be homogeneous by 7.5% nativePAGE. The molecule was consisted of a single Submit with a molecular weight of 80K, but the number of the subunits was not determined. The protein was defined as glycoprotein by Schiffl's reagent stainting. Rabbit antibody prepared against the purified protein crossreacted with the 5th instar larval haemolymph protein of Antheraea pernyi and Anteraea yamamai, but not with those of Bombyx mori and Bombyx mandarina.

Serum Levels of IL-6 and IL-10 in Patients with Cervical Cancer

( Moon Hong Kim ),( Ju Won Roh ),( Hyun Yee Yoon ),( Jae Weon Kim ),( Noh Hyun Park ),( Yong Sang Song ),( Soon Beom Kang ),( Hyo Pyo Lee ) 대한산부인과학회 2001 대한산부인과학회 학술대회 Vol.87 No.-

Effect of immersion into solutions at various pH on the color stability of composite resins with different shades

Moon, Ji-Deok,Seon, Eun-Mi,Son, Sung-Ae,Jung, Kyoung-Hwa,Kwon, Yong-Hoon,Park, Jeong-Kil The Korean Academy of Conservative Dentistry 2015 Restorative Dentistry & Endodontics Vol.40 No.4

Objectives: This study examined the color changes of a resin composite with different shades upon exposure to water with different pH. Materials and Methods: Nanohybrid resin composites (Filtek Z350XT, 3M ESPE) with four different shades (A2, A3, B1, and B2) were immersed in water with three different pH (pH 3, 6, and 9) for 14 day. The CIE $L^*a^*b^*$ color coordinates of the specimens were evaluated before and after immersion in the solutions. The color difference (${\Delta}E^*$) and the translucency parameter (TP) were calculated using the color coordinates. Results: ${\Delta}E^*$ ranged from 0.33 to 1.58, and the values were affected significantly by the pH. The specimens immersed in a pH 6 solution showed the highest ${\Delta}E^*$ values (0.87 - 1.58). The specimens with a B1 shade showed the lowest ${\Delta}E^*$ change compared to the other shades. TP ranged from 7.01 to 9.46 depending on the pH and resin shade. The TP difference between before and after immersion in the pH solutions was less than 1.0. Conclusions: The resulting change of color of the tested specimens did not appear to be clinically problematic because the color difference was < 1.6 in the acidic, neutral, and alkaline solutions regardless of the resin shade, i.e., the color change was imperceptible.

Improvement of Mchanical Property of Indium-tin-oxide Films on Polymer Substrates by using Organic Buffer Layer

Park, Sung-Kyu,Han, Jeong-In,Moon, Dae-Gyu,Kim, Won-Keun The Korean Institute of Electrical and Electronic 2002 Transactions on Electrical and Electronic Material Vol.3 No.2

This paper gives the basic mechanical properties of indium-tin-oxide (ITO) films on polymer substrates which are exposed to externally and thermally induced bending force. By using modified Storney formula including triple layer structure and bulge test measuring the conductive changes of patterned ITO islands as a function of bending curvature, the mechanical stability of ITO films on polymer substrates was intensively investigated. The numerical analyses and experimental results show thermally and externally induced mechanical stresses in the films are responsible for the difference of thermal expansion between the ITO film and the substrate, and leer substrate material and its thickness, respectively. Therefore, a gradually ramped heating process and an organic buffer layer were employed to improve the mechanical stability, and then, the effects of the buffer layer were also quantified in terms of conductivity-strain variations. As a result, it is uncovered that a buffer layer is also a critical factor determining the magnitude of mechanical stress and the layer with the Young's modulus lower than a specific value can contribute to relieving the mechanical stress of the films.

Gender Differences in Activity and Induction of Hepatic Microsomal Cytochrome P-450 by 1-Bromopropane in Sprague-Dawley Rats

Park, Sang Shin,Kim, Ki Woong,Jeong, Hyo Seok,Moon. Young Hahn,Jeong, Jae Hwang,Kim, Hyeon Yong,Park, Sang Hoi,Lee, Jun Yeon 생화학분자생물학회 2000 BMB Reports Vol.32 No.3

Sex differences in the induction of microsomal cytochrome P-450 (CYP) and the activities of several related enzymes of Sprague-Dawley rats treated with 1bromopropane (1-BrP) were investigated. Male and female rats were exposed to 50, 300, and 1800 ppm of 1-BrP per ㎏ body weight (6 h a day, 5 days a week, 8 weeks) by inhalation. The mean body weight of 1-BrP treated groups increased according to the day elapsed, but four and five weeks respectively after the start of the exposure, the mean body weight of male and female rats had significantly reduced in the group treated with 1800 ppm 1-BrP compared with the control group (p$lt;0.01). While the relative weights of liver increased in both sexes, statistical significance in both sexes was found only in the group receiving 1800 ppm/㎏ of 1-BrP (p$lt;0.01). The total contents of CYP, b_5, NADPH-P-450 reductase, NADH b_5 reductase, ethoxyresorufin-O-deethylase (EROD), pentoxyresorufin-O-dealkylase (PROD), and p-nitrophenol hydroxylase (pNPH) activities were examined for the possible effects of 1-BrP. No significant changes in the CYP and bs contents, NADPH-P-450 reuctase, NADH b5 reductase, ethoxyresorufin-O-deethylase (EROD), and pentoxyresorufin-O-dealkylase (PROD) were observed between the control and treated groups. The activity of pNPH increased steadily with the increase in the concentration of 1-BrP in both sexes, but was significantly increased only in the 1800 ppm-treated group of male rats (p$lt;0.05). When Western blottings were carried out with three monoclonal antibodies (MAb 1-7-1, MAb 266-3, and MAb 1-98-1) which were specific against CYP1A1/2, CYP2B1/2, and CYP2E1, respectively, a strong signal corresponding to CYP2E1 was observed in microsomes obtained from rats treated with 1-BrP Glutathione S-transferase (GST) activity and the content of lipid peroxide significantly increased in the treated groups compared with the control group (p$lt;0.05). These results suggest that 1-BrP can primarily induce CYP2E1 as the major form and that GST phase II enzymes play important roles in 1-BrP metabolism, showing sex-dependence in the metabolic mechanism of 1-BrP in the rat liver.

Role of 14-3-3-beta in the migration and invasion in human malignant glioma cell line U87MG

Park, Sung-Geun,Jung, Shin,Ryu, Hyang-Hwa,Jung, Tae-Young,Moon, Kyung-Sub,Kim, In-Young,Jeong, Young-Il,Pei, Jian,Park, Seung-Jin,Kang, Sam-Suk Informa UK (TaylorFrancis) 2012 Neurological research Vol.34 No.9

<P>To assess the influence of 14-3-3-beta in modulating the migration and invasion of human glioma cells.</P>