Superconducting MgB2 Wire Drawing Considering Anisotropic Hardening Behavior and Hydrostatic Effect

Young‑Seok Oh,Ho Won Lee,Kook‑Chae Chung,Duck‑Young Hwang,Seong‑Hoon Kang,Jeong Whan Yoon 대한금속·재료학회 2022 METALS AND MATERIALS International Vol.28 No.7

Numerical modeling was conducted to investigate the deformation behavior of powder mixture during multi-pass drawingprocesses for multi-filamentary MgB2wire. A modified Drucker-Prager Cap (DPC) model with an elliptical cap surface usingthe new material characterization method was developed to capture the anisotropic hardening behavior and hydrostatic effectof the powder mixture. A number of uniaxial die compaction, cold isostatic pressing, diametrical compression, and uniaxialcompression tests were conducted using different powder densities to characterize the modified DPC model. A commercialfinite element software ABAQUS with a user subroutine was used to simulate the drawing of the MgB2wire. The densityand area fraction of the powder mixture during the wire-drawing process were verified with experimental results. The differencein packing density at the inner and outer filaments of the MgB2wire was successfully captured by simulation. Inaddition, the effect of the initial packing density on the superconducting properties of MgB2wire was numerically studied. It is shown that the increase in the superconducting area, which results from a high initial packing density, should be moreeffective compared to the increase in the grain connectivity in enhancing the critical current properties for the MgB2wirewhen the final packing density is saturated after a number of drawing processes.

유아 언어영재 판별에서 프로젝트 스펙트럼(Project Spectrum)의 활용에 대한 기초연구

장영숙,황윤세 한국영유아보육학회 2003 한국영유아보육학 Vol.0 No.33

The identification of verbally gifted children during early childhood is very important for developing their potential in the society. Nonetheless, most researchers preferred to study the gifted of mathematics and science in the primary and secondary levels where reliable predictions of gifted may be made. Comparatively little work has been done in this area. Verbal Giftedness of young children is still developing and less stable than that of older children, and this prevents us from making firm and accurate identification. Project Spectrum can be used for the alternative assessment for the identification of verbally gifted children. The advantages of the Project Spectrum approach for the identification of verbally gifted children are as follows: First, the Spectrum approach can provide a useful means for assessing young verbally gifted children who have not demonstrated high ability on traditional identification method. Second, the Spectrum approach can blur the line dividing curriculum and assessment and thus can assess the learning process of young children.. Third, the Spectrum approach can embed assessments in meaningful, real-world activities Fourth, the Spectrum approach can be a more accurate predictor of potential by linking diagnosis and instruction. Thus, it can make us provide an educational treatment effectively for young verbally gifted children. Fifth, the Spectrum approach can lead individualized education by the early identification of young verbally gifted children.

연구논문 : 대학생들의 인터넷 중독에 영향을 미치는 요인에 대한 연구

권미영 ( Mi Young Kwon ),황지영 ( Ji Young Hwang ),정혜윤 ( Hye Yoon Jung ),송시형 ( Shi Hyeong Song ) 극동대학교 사회복지연구소 2013 글로벌사회복지연구 Vol.3 No.2

본 논문의 목적은 대학생의 인터넷 중독에 영향을 주는 요인에 대한 분석을 통해 대학생의 정신건강을 위한 공적프로그램 도입에 대한 함의를 제공하는 것이다. 분석자료는 을지대학교 강남 을지 병원 중독연구소에서 대학생 453명을 대상으로한 설문지이다. 설문조사에 사용된 설문지는 인터넷 중독을 측정하는 인터넷 중독 척도(Young척도), 불안을 측정하는 불안척도(STAI)와 우울을 측정하는 Beck의 우울척도(BDI)로 구성되었다. 분석결과 첫째, 연령 및 학년은 인터넷 중독에 유의미한 영향을 미쳤다. 둘째, 나이가 어릴수록, 학년이 낮을수록 불안과 우울에 빠지기 쉬웠다. 셋째, 무엇보다 불안이 대학생의 인터넷 중독에 가장 큰 영향을 미치는 요인이었다. The purpose of this research to suggest implications on introduction of public-program for college students` mental health through analysing the factors which impact on internet addiction of college students. The analysing data is questionnaire intended to 453 college students in Kang- Nam Eulji hospital addiction institute. The questionnaire consisted of internet addiction scale (Young-scale), anxiety scale (STAI) and depression scale (BDI). This study reveals three main findings. Firstly, age and grade have an effect on internet addiction. Second, the younger, the lower grade, they are likely to be depressed and anxiety. Third, most of all, the anxiety has the most effect on internet addiction of college students.

强風의 發生成因別 時間的 變化에 관한 硏究

황진득,하영철,곽윤근 金烏工科大學校 1994 論文集 Vol.15 No.-

The wind resistant design of building generally used up to data has been based on the value of an extreme speed. The extreme speed is normally estimated from wind data observed for the return periods of last 50 years or 100 years on the basis of the importance of building to be constructed. However, it is essential to consider the time variance of wind action because strong winds originated by Typhoon or others are occationally coming for attack. This study is to examine the origin of occurence and the action time of strong wind, and to understand the time variance characteristics. Strong winds are divided into 3 parts such as the regional condition of Korea, namely Typhoon, Frontal system storm, and Monsoon. The areas reflecting the origin of 3 kinds of the strong winds are also devided are selected as such as Seoul-Kyongki, Jungbu, and South-seashore. The representative cities are selected as Seoul fro, Uljin and Kunsan for, and Busan and Yeosu for. Observed wind data of past 20 years will be employed to estimate duration and propability of wind velocity. The observed wind data are recorded with duration of 96 hours at the center that annual extreme wind speed takes place, and with the mean value of wind velocity during 10 minutes at 1 hour interval. Based on these investigations, the duration and probability of wind velocity should be estimated. Generalized probability distribution function of wind velocity will be proposed. Duration of strong winds presented as a function of its maximum wind velocity. From these results, multipling generalized distribution function by generalized number of (wind velocity) samples, approximate equation of wind-duration will be derived. Approximate equation of wind-duration proposed in this study should be useful for analysing fatigue damage of structures and time dependent analysis of structure under strong wind in Korea.

Vygotsky 이론에 입각한 유아 도덕교육의 방향 탐색

황윤세,장영숙 한국영유아보육학회 2003 한국영유아보육학 Vol.0 No.34

The study for early childhood moral education divides into two streams. One is the social approach(moral socialization) which emphasizes the internalization of morality by socialization. Another is the developmental approach(moral development) which focuses on the development of moral judgment. But the moral education can not be prescribed to be only one side. This study would like to overcome these problems through Vygotsky's theory. The moral development happens between the two levels, which become the boundary of ZPD in the Vygotsky's theory. Vygosky points out the importance of delivering the educational content by teachers(or scaffolders). He argues that teaching leads child's development. In light of Vygotsky's theory, desirable moral education during early childhood can be achieved by the appropriate teaching and learning process through shared activity between a teacher and a child. Both the social approach and the developmental approach for moral education ignored the content or the method of the moral education. These two approaches will overcome the problem by discussing the teaching and learning method which is derived from Vygotsky's theory.

GIS을 이용한 釜山市 公共的 土地利用패턴 分析

황영우,윤철현 동아대학교 법학연구소 1999 硏究報告 Vol.22 No.2

This study tries to analyze land use pattern by zoning through urban spatial structure. Land uses in Pusan are mixed using in spite of zoning operation. New residential area is made like a frog leaping to the outer of the City. The efficiency of existing residential area is very low to compare with newly developed area cause of delayed regeneration. Especially the existing built-up area of Pusan in insufficient in adaptability and preperation going with the change of urban spatial structure, particularly with the zoning system. Therefore, detailed and scientific feasible plan should be established to have reasonable residential environment.

CAS 세멘트 제조에 관한 기초연구

황용길,윤한중 東亞大學校 1998 東亞論叢 Vol.35 No.-

The experimental results of synthesized expansive sttringites with aqueous solution of aluminumsulphate and milk of lime are as follows. 1) The synthesized reactions are progressed toward exothermic reaction rapidly. 2) Compared to crystallizing H₂O content of the synthesized 3Cao·Al₂O₃·3CaSO₄·xH₂O, diluted aqueous solutions is less than conc aqueous solution. 3) The crystal forms of synthetic ettringite are observed to spherical and column forms by SEM. 4) By the results of XRD analysis, ettringites contained below 6 mols CaO appeared to CaSO₄ but in the 7 and 8 mols CaO contained ettringites obtained CaSO₄and free CaO. 5) The expansibility and water absorption rate of 6 and 7 mols CaO contained ettringites are excellent.

경관 Simulation을 통한 수영강 연접지역의 건축물 고도규제 방안

윤시운,이광국,황영우 東亞大學校 建設技術硏究所 1999 硏究論文集 Vol.23 No.1

This study analyzes the future landscape assesment of Suyoung-River and adjacent areas. Computer Simulation method is used for these purposes. It is expected that the high buildings and high density in Suyoung Information Site might cover the Jang-Mountain view. Therefore this study analyzes the expectations by the experiment of the change of the heights of buildings and the view-point so that Suyoung Information Site can secure the feelings of openness and can be harmonious with natural landscape and skyline. If the high dense buildings are going to be constructed, the optimum condition of development should be between 1.5 and 2.0 of evaluation indicator. The minimum indicator 1.5 would be appropriate as the standard of regulation. The results show that the buildings along the riverside road in the west need to be regulated under the height of 30m(about 10 stories) and the buildings along the Chungryul-Street in the east under the height of 90m(about 30 stories). 하천은 산과 구릉지 등과 함께 도시의 아름다운 경관을 형성하는 중요한 경관요소이다. 도시내 하천변에 나타나는 경관문제는 대부분 대규모 건축물에 의한 경관 훼손에서 비롯된다. 부산의 대부분 하천은 시가지를 통하여 바다로 유입되고 있으나 대부분 복개되었거나 주변지역의 고층건물 입지로 인해 하천 자체가 시민에게 주는 정 (正)의 경관적 요소는 점점 감소하고 있다. 본 연구의 대상지인 수영강은 현재 시가지내를 흐르고 있어 시민에게 주요한 openspace로 기능하고 있다. 주변지역은 지금까지 수영 비행장이라는 기능으로 연해 개발이 유보되어 오다 최근 수영정보단지의 개발계획 등으로 인해 개발압력을 강하게 받고 있다. 향후개발이 진행된다면 수영강변에서 조망할 수있는 주변 자연경관과 시가지 경관은 차폐될 뿐만 아니라, 그 자체의 규모가 크고 형태도 단조로와 위압적이고 획일적인 경관이 형성되게 될 것이다. 현재에도 수영강변의 구릉지에는 아파트 가 입지하여 조망을 차폐하고 있을 뿐 아니라 녹지를 잠식하고 있다. 이러한 현상은 향후 개발압력에 빌려 수영강변의 어느 지역 에서나 발생하는 공통적인 현상이 될 것이다. 이러한 조망차폐, 획일성, 위압감의 조성, 지형의 훼손 및 잠식 등으로 대표되는 수영강의 경관문제는 현행법상 건축심의 시 받는 경관심의로 해결하기에는 한계가 있다. 따라서 본 연구는 수영강과 연접지역, 그리고 배경녹지축인 주변산을 공간적 범위로 하여 첫째, 수영강 연접지역의 범위를 설정하고 연접지역을 몇 개의 경관구역으로 나누어 각 경관구역별 경관의 문제점과 특성을 살펴본다. 둘째, 경관분석을 위하여 Computer를 이용한 수영강변 주요 조망점 에서 사람의 눈에 보이는 대로 주변 경관을 연출해 낼 수 있는 가상의 경관 Simulation을 실시한다. 셋째,이를 바탕으로 수영강 연접지역의 건축물 고도규제 를 위한 기준설정과 고도규제 방안을 제안하는데 목적이 있다.

테니스 포핸드시 밀어치기와 때려치기 타법의 운동학적 분석

윤양진,정미라,서국웅,이훈식,황명숙,강영택,윤길환 釜山大學校 附設 體育科學硏究所 1999 體育科學硏究所 論文集 Vol.15 No.-

This study consists in clarifying the meaning of various angles and velocity, and two types of the stroke of a pushing shot and hitting shot through the three-dimensional image analyses among the factors of exercise. To attain the purpose of such studies, the result of experiment and analysis for each of three athletes of boys and girls in high school and three persons in general came to the conclusion as follows; 1. The last motion of a group of A having a command of a follow shot showed greatly, compared with two groups of B and C, and this showed that a group of A took a rectilinear motion greatly to gain power and two group of B and C took a rotary motion greatly to gain speed. 2. A group of A having a command of a pushing shot move body weight forward from behind and give the first consideration to a rectilinear motion, and two groups of B and C having a command of the stroke of hitting shot used the turning of the shoulder and the waist and gave much weight to a rotary motion than a rectilinear one. 3. The position of the hitting point of a group of A having a command of a pushing shot turned out to be the waist, and that of the hitting point of two groups of B and C, the chest, and namely this showed that the position of the hitting point was decided according to the form of the stroke and pictures of various kinds. 4. In impacting, the speed decreased, for the power was controled to keep an accurate timing of stroke just before impacting

급성 골수성 백혈병 환자에서 관해 유도 항암 화학요법 후 발생한 베르니케 뇌증

황진원,정재현,서광원,최병진,송영진,김종윤,이은지,임홍규,이상민 인제대학교 2009 仁濟醫學 Vol.30 No.-

Wernicke's encephalopathy is characterized by the triad of ocular symptoms, ataxia, and mental confusion and neuropsychiatric condition generally caused by acute thiamine deficiency. Although it is common in the severe alcoholics, several other causes also have been identified, such as total parenteral nutrition (TPN) use, hyperemesis gravidarum, anorexia nervosa, hemodialysis, uremia, and acquired immunodeficiency syndrome(AIDS). Chemotherapy in patient with malignanacy and long term total parenteral nutrition following bone marrow transplantation are related with Wernicke's encephalopathy. A 48-year-old woman had been treated with Daunorubicin and Cytarabine for remission induction chemotherapy of acute myeloblastic leukemia and intravenous hyperalimentation due to persistent hematochezia and ileus caused by infiltration of leukemic cell in terminal ileum. She suddenly complained of diplopia, tremor, and mental confusion at 32th day after chemotherapy and generalized tonic-clonic seizure at 34th day after chemotherapy. The diagnosis of Wernicke's encephalopathy was made with clinical presentations and brain MRI. Brain MR T2-weighted & Flair image revealed a high signal intensity lesions bilaterally at the medial thalamus and peri-acueductal grey matter of the midbrain. The patient was successfully treated with vitamin B1. We presented a case of acute Wernicke's encephalopathy developed after remission induction chemotherapy followed by intravenous hyperalirnentation in a patient with acute myeloblastic leukemia.