용철과 제강 slag 간의 산소 및 인의 분배평형에 대한 정규용액 model 의 적용

심재동,정순효,만곡지랑 대한금속재료학회(대한금속학회) 1981 대한금속·재료학회지 Vol.19 No.3

The approximate validity of the regular solution model for canons was examined to formulate the thermodynamic properties of steelmaking slags and to express quantitatively the equilibrium reaction between slag and metal. 1) The regular solution model was satisfied for multi-component stags such as Fe_tO-SiO₂-MgO, Fe_tO-SiO₂-CaO-MgO and Fe_tO-SiO₂-CaO-MgO-P₂O_5 systems, and the following values were obtained as interaction energies between cations. α_(15)(Fe^(2+)∼Mg^(2+))=3.070㎈, α_(25)(Fe^(3+)∼Mg^(2+))=-5,620㎈, α_(35)Si^(4+)∼Mg^(2+))=-30,500㎈, α_(45)(Ca^(2+)∼Mg^(2+))=4,500㎈, α_(36)(Si^(4+)∼P^(5+))=11,000㎈, α_(46)(Ca^(2+)∼P^(5+))=-125.000㎈, α_(56)(Mg^(2+)∼P^(5+))=-85,000㎈ 2) It was confirmed that applying the values of interaction energy to the regular solution model had enough certainty to estimate the oxygen content in liquid iron within the accuracy of ±10% over the wide range of slag compositions from basic to acidic stags. 3) Simple regular solution approximation was less favorable to apply for the phosphorus distribution between liquid iron and stags. It was proposed that a further modification of the model considering composition dependence of α_(ij) should be necessary to express the phosphorus equilibrium with a mathematical formula.

회전실린더 주위 유동장에 대한 포텐셜유동 해석

박운진,심재동 한국기술교육대학교 1999 論文集 Vol.6 No.1

The flow field generated by a 2-D rotating cylinder on a fixed ground plane was analytically investigated by use of potential flow theory and the Kutta-Joukowski lift theorem to simulate aerodynamic characteristics of rotating wheels of an automobile. In the flowfield around a rotating cylinder on the wall, unique flow patterns are identified; the stream lines are asymmetrical about the horizontal axis of the cylinder center regardless of rotation rate. As the rotation rate increases, the lift force of the cylinder on the wall increases quadratically.

고체산화철의 상방첨가에 의한 용선의 탈규거동 (脫硅擧動)

심재동,송규섭,현도빈 대한금속재료학회(대한금속학회) 1984 대한금속·재료학회지 Vol.22 No.2

The behaviors of desiliconization of the hot pig iron by adding the solid iron oxide as a desiliconizing agent were studied. Even when small amount of iron oxide is added, the degree of desiliconization can be reached to 70% under the condition of slag with the basicity over 1.0. During desiliconizing treatment, the competiting reactions such as demanganization and decarburization are suppressed in the above slag condition. In (FeO) content less than 5%, the distribution ratio of silicon between slag and metal is approximately in agreement with the equilibrium value.

般若心經에 나타난 假借字와 漢文語文法的 考察

沈載東 동국대학교 불교대학원 1999 佛敎大學院 論叢 Vol.6 No.-

We are Chosen people and the Oriental. At the same time, we are a cosmopolitan and Modern man. Modern men living these days are heard the division of the east and west is meaningless. But, as the morning is morning and the evening has its mood in day, and the cat must be like cat and the puppy must be like puppy. Namely, not to lose one's natural figure is beautiful. However well we may imitate West culture, if we don't have the pulse of the East civilization, ultimately we become indecisive Korean. Therefore, our own thing is valuable to us, and we have to culture it significantly because it is important. Within merely 100 years since we has opened the door of civilization, we lost too much our thing and aren't we wandering in the emptiness of culture? As we can't image today without yesterday, we can't pledge future prosperity by burying the past. Everlasting cultural inheritance which we are succeeded to, namely the ancient's thought and ideology, experience and fact, and their customs and joys and sorrows, when we think all these are written in Chinese, it admits of no argument about the necessity of Chinese writing education for understanding the past and handing down it. But, the problem to the moderns is the trouble having to make themselves familiar with Chinese writing, and once do it, it isn't achieved fast. This treatise are made under following promise : to solve these problems, most of all the learning method of Chinese writing must be scientific and effective. Summarizing this treatise. In the 2nd chapter, the special character of Chinese letters and writing are studied, it the 3rd chapter, the original meaning of Gachaja and how much it is coincided with the primary meaning of Sanskrit are studied by selecting <the Prajn~a￣pa￣ra> as text, in the 4th chapter, < the Prajn~a￣pa￣ra> was analyzed as Chinese writing grammar : first the whole content of scripture are divided into an introduction, the main discourse, and a conclusion, second, to divide each composition into paragraphs, then, third, divide up the phrase and stanza, and analyze the structure according to it and make clear the word order, so the composing principle is to grasped in every composition. The effort of this treatise is concentrated on this part, and the grammatical analyzing method may be applied to all books as well as Buddhist scriptures.

생체의료용 티타늄합금의 연구개발 동향

심재동,석현광 한국생체재료학회 2011 생체재료학회지 Vol.15 No.4

Titanium alloys are in the spotlight for biomedical applications such as bone plates, dental implants, artificial hip and knee joints, because they have merits in biocompatibility, light weight, corrosion resistance and mechanical properties. Recent R&D issues of biomedical titanium alloys have been focused on alloy designs satisfying both non toxic biocompatibility and mechanical compatibility. Al and V in conventional Ti-6Al-4V alloys are replaced into non toxic elements such as Nb, Ta, Mo, Zr, etc., and new β-type titanium alloys with low elastic modulus are developed. The surface modification technology is also important topic for bioactive function of titanium alloys. This paper is giving an overview about recent R&D trend in biomedical titanium alloys.

마그네슘합금의 표면처리에 관한 연구개발 동향

심재동,변지영,Shim, Jae-Dong,Byun, Ji-Young 한국재료학회 2013 한국재료학회지 Vol.23 No.1

Recently, consumption of magnesium alloys has increased especially in the 3C (computer, communication, camera) and automobile industries. The structural application of magnesium alloys has many advantages due to their low densities, high specific strength, excellent damping and anti-eletromagnetic properties, and easy recycling. However, practical application of these alloys has been limited to narrow uses of mild condition, because they are inferior in corrosion resistance and wear resistance due to their high chemical reactivity and low hardness. Various wet and dry processes are being used or are under development to enhance alloy surface properties. Various conversion coating and anodizing methods have been developed in a view of eco-friendly concept. The conventional technologies, such as diffusion coating, sol-gel coating, hydrothermal treatment, and organic coating, are expected to be newly applicable to magnesium alloys. Surface treatments for metallic luster or coloring are suggested using the control of the micro roughness. This report reviews the recent R&D trends and achievements in surface treatment technologies for magnesium alloys.

소재관련(素材關聯) 출연연구소(出演硏究所)의 소개(紹介) : 한국과학기술연구원 금속연구부

심재동 대한금속학회 1996 大韓金屬學會會報 Vol.9 No.4

곡옥소종(曲沃小宗)과 상곽촌묘지(上郭村墓地): 춘추(春秋) 초(初) 진국(晉國)의 새로운 발전

심재동 中國史學會 2004 中國史硏究 Vol.33 No.-

마그네슘합금의 조직제어(組織制御)와 성형가공(成形加工) 및 스크랩 리싸이클링 기술(技術)

심재동,이동휘,Shim, Jae-Dong,Lee, Dong-Hui 한국자원리싸이클링학회 2011 資源 리싸이클링 Vol.20 No.1

마그네슘 합금은 비중이 1.74로 가벼운데다 비강도는 구조용 금속 중에서 가장 크며, 방진성, 전자파 차폐성, 저용점 용 여러 가지 장점이 있어 최근 자동차 부품과 전자산업 제품 분야에서 이용이 크게 기대되는 금속이다. 그러나 마그네슘의 결정구조는 조밀 육방정이기 때문에 소성변형이 가능한 슬립면이 한정되어 있으며 압연이나 압출가공 시에는 강한 집합조직이 형성되어 상온가공이 곤란하다. 따라서 지금까지 성형성 개선을 위한 조직제어와 성형기술 분야에서 많은 연구개발이 이루어져 왔다. 본고에서는 결정립과 집합조직에 관한 미세조직의 제어방법, 용체성형, 압연 및 압출에 관한 성형가공 기술과 마그네슘 스크랩 리싸이클링 기술에 관하여 최근의 연구개발 사례를 소개한다. Recently, magnesium alloys are in the spotlight as a promising materials in the fields of automobile parts and electronic appliances due to their merits representing light weight, high specific strength, damping property, shielding of electromagnetic wave and so on. However, magnesium alloys show a poor formability at room temperature because magnesium has HCP crystal structure with limited slip planes and strong basal texture is formed during plastic deformation process such as rolling and extrusion. Therefore, many R&D efforts have been paid for improvement of formability through grain refinement, texture control and various forming technologies. This paper is giving an overview about recent achievements on control of microstructures, forming technologies and magnesium scrap recycling.

과학교사 전문성 기준 : 포스터 발표 ; 10학년 과학 산-염기관련 주제에 대한 교과서 분석 및 WBI 학습자료 개발

심재동 한국과학교육학회 2004 한국과학교육학회 학술발표 및 세미나집 Vol.- No.-