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Effect of Asymmetric Hot Rolling on the Texture Evolution of Fe–3%Si Steel
Tae‑Wook Na,Hyung‑Ki Park,박창수,Hyung‑Don Joo,Jong‑Tae Park,Heung Nam Han,Nong‑Moon Hwang 대한금속·재료학회 2018 METALS AND MATERIALS International Vol.24 No.6
In Fe–3%Si steel, the hot rolling process affects not only the hot rolling texture but also the primary recrystallization texture. Here, the effect of asymmetric hot rolling was studied by comparing the difference in the texture evolved between asymmetricand symmetric hot rolling. The effect of asymmetric hot rolling on the texture of primary recrystallized Fe–3%Si steel wasalso studied. The symmetric hot rolling of Fe–3%Si steel produces a rotated cube texture at the center but Goss and coppertextures near the surface. Asymmetric hot rolling tends to produce Goss and copper textures even at the center like thetexture near the surface. After primary recrystallization, the dominant texture at the center changes from {001} <210> to{111} <112> and the new texture has a higher fraction of the grains which make the low energy boundary with Goss grainsthan that of symmetric hot rolling.
법랑모세포 분화와 법랑질 형성과정에서 OD314, Apin protein의 발현 및 기능
박종태,최용석,김흥중,정문진,오현주,신인철,박주철,손호현 대한치과보존학회 2006 Restorative Dentistry & Endodontics Vol.31 No.6
본 연구에서는 법랑모세포 분화와 법랑질 형성에 연관이 있는 OD314 일명 Apin protein의 기능을 밝힐 목적으로, in-situ hybridization에 의한 OD314 mRNA 발현과 법랑모세포 세포주에서 OD314 enamel matrix protein의 발현, 그리고 OD314 유전자를 과발현/억제시킬 수 있는 construct를 제작한 후 법랑질 형성 중에 OD314의 기능을 알아보고자 RT-PCR를 시행하여 다음과 같은 결과를 얻었다. 1. OD314 mRNA는 발생중인 상아모세포보다 법랑모세포에서 강하게 발현되었다. 2. Tuftelin은 석회화 결정이 형성되는 14일까지 발현이 지속되고, 그 이후부터 점차 감소하였다. Amelogenin과enamelin은 7일부터 그 발현이 점점 감소하였다. 3. U6-OD314 siRNA construct를 이용하여 transfection한 법랑모세포 세포주는 OD314와 tuftelin,MMP2 mRNA 발현이 감소하였으며, CM-OD314를 transfection하여 OD314의 과발현을 유도한 경우에는 OD314와 MMP20 mRNA의 발현이 뚜렷이 증대되었다. 이 결과는 OD314가 법랑모세포의 분화와 법랑질의 형성 그리고 석회화 과정에 중요한 역할을 하는 새로운 인자임을 시사한다. This study was aimed to elucidate the biological function of OD314 (Apin protein), which is related to ameloblast differentiation and amelogenesis. Apin protein, calcifying epithelial odontogenic (pindborg) tumors (CEOTs)-associated amyloid, were isolated from CEOTs, and has similar nucleotide sequences to OD314. We examined expression of the OD314 mRNA using in-situ hybridization during tooth development in mice. Expression of OD314 and several enamel matrix proteins were examined in the cultured ameloblast cell line up to 28 days by reverse transcription-polymerase chain reaction (RT-PCR) amplification. After inactivation and over-expression of the OD314 gene in ameloblast cell lines using U6 vector-driven RNA interference and CMV-OD314 construct, RT-PCR were performed to evaluate the effect of the OD314 during amelogenesis. The results were as follows: 1. In in-situ hybridization, OD314 mRNAs were more strongly expressed in ameloblast than odontoblast. 2. When ameloblast cells were cultured in the differentiation and mineralization medium for 28 days, the tuftelin mRNA expression was maintained from the beginning to day 14, and then gradually decreased to day 28. The expressions of amelogenin and enamelin were gradually decreased according to the ameloblast differentiation. 3. Inactivation of OD314 by U6-OD314 siRNA construct down-regulated the expression of OD314, MMP-20, and tuftelin, whereas over-expression of OD314 by CMV-OD314 construct up-regulated the expression of OD314 and MMP-20 without change in tuftelin. These results suggest that OD314 is considered as an ameloblast-enriched gene and may play the important roles in ameloblast differentiation and mineralization.
냉간성형 금형용강(STD11)의 형조각 방전가공 특성에 관한 연구
박흥식,전태옥 동아대학교 공과대학 부설 한국자원개발연구소 1995 硏究報告 Vol.19 No.2
This study has been performed to investigate MRR(metal removal rate), REW(relative electrode wear), surface roughness, heat transmutation layer and microhardness distribution in cross-section of the machined surface varing pulse-on duration and peak pulse current to find out the best EDM condition of the heat treated STD11 which is extensively used for metallic molding steel by using the die sinking EDM.
황흥석,박태원,조규성,유진식 한국경영과학회 2000 한국경영과학회 학술대회논문집 Vol.- No.1
본 연구에서는 자동차의 차체조립공정설계를 위하여 FACTOR/AIM 및 자체 개발한 생산시스템 성능평가를 위한 시뮬레이션 프로그램을 이용하여 비교 연구하였다. 이를 위하여 먼저 자체에서 개발한 시스템성능 산정 방법으로 초기 해를 구하고 세부 생산라인의 고장 Data와 조립라인의 구성, 운반장비 등의 의 다양한 여건을 고려하기 위하여 FACTOR/AIM을 사용하였다. Data의 분석을 위하여 ExpertFit를 사용하였으며 초기 시스템 모델링 및 Data로 부터 목표 생산시스템을 만족하는 시스템을 단계별로 찾아가는 과정을 사용하여 최적 해를 구하였다. 본 연구에서 분석한 K회사의 경우 목표 생산량 70대/시간을 만족하기 위하여 4 차의 개선을 통하여 71.57대/시간의 생산라인을 구하였다. 본 연구에서 생산조립라인의 공정설계를 위한 시뮬레이션 과정을 실 예를 들어 제시하였으며 다른 제품의 생산공정분서에도 활용 가능하리라 생각된다.
오스템퍼링 처리한 구상흑연주철의 절삭시 공구마멸에 관한 연구
전태옥,박흥식,예규현,서영백 동아대학교 공과대학부설 생산기술연구소 1996 生産技術硏究所硏究論文集 Vol.1 No.-
This study was carried out to investigate the character ot cutting tool's wear by acoustic emission(AE) in machining austempered ductile iron(ADI). The following results have been obtained. (1) Ceramic tool among tools of P20, NC123K and ceramic had the best performance in machining ADI materials. (2) As cutting speed increased, the amplitude level of AE signal increased. (3) The In-process detection of cutting tool's wear in able to by use of AE signals. (4) In initial of cutting, surface roughness was large effect to the flank wear to some range.
플라이오메트릭 트레이닝이 멀리뛰기 記錄에 미치는 影響 : 남자 중학생을 중심으로
金興植,朴鍾泰 公州大學校스포츠科學硏究所 1995 스포츠科學硏究所論文集 Vol.- No.9
It is possible to improve the record of Track & Field events Which are the basis of various sport events like other sports improvement. In long-jump physical strength such as muscular strength, power and flexibility as well as inborn puality in an essential element in proving ones record. In order to strengthen such physical strength conditions, I made an experiment to find out the effect of plyometric training on long-jump on the basis of researches precedent. The subject of the experiment were the 30 seniormen selected at random in "D" middle school in Chung Chong Nam Do. They are devided into three group; group A(N=10) using 30㎝-high box, group B(N=10) using 40㎝-high box, group C(N=10) using 50㎝-high box were given box-jumps and depth-jumps and incline bound. 3 times (Mon, Wed, Fri) a week for 8 weeks. The analyzing (ANOVA) results of comparing the record of prexperiment with post-experiment was followed : 1. In case of a standing broad jump, the average of each group have improve by 2.6㎝ in group A, 3.7㎝ in group B and 11.1㎝ in group over its predecessors. The other two groups except group A showed significant results.(p<0.05) 2. In case of a standing high jump. The other two group except group A showed significant results.(p<0.05) 3. In case of 20m dash, the speed has improved 0.17 sec in group A, 0.26 sec in group B, 0.41 sec in group C. The other two groups except groups A showed signigicant results.(p<0.05) 4. In case of long jump, the average record of each group have improved by 9㎝ in group A, 13㎝ in group B, 24㎝ in group C over its predecessors. The other two groups except group A showed significant results.(p<0.05) In plyometric training, it was proved that the jumping height in the group C was the most proper of the three groups. And in the group C producing significant results the record was most increased 11.1㎝ in case of a standing broad jump, 4.5㎝ in a standing high jump, and -0.41 sec in 20m dash respectively, in case of long jump increased 24㎝ in the group C significant results.(p<0.05)