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.

치료경험이 있는 A형 혈우병 환자에서 그린모노^�의 약동학 및 안전성 : 전향적 다기관 공동 임상시험

윤휘중,이순용,황태주,손영택 德成女子大學校 藥學硏究所 2001 藥學論文誌 Vol.12 No.1

배 경 : 최근 국내에서 사용 가능해 진 단클론항체를 이용한 고순도의 제 8응고인자 그린모노^R에 대하여, 제품의 약동학적 측면을 관찰하고, 급성 이상반응 발생 측면의 안전성을 관찰하고자 하였다. 방 법 : 과거 응고인자 치료경험이 있는 제 8응고인자치 5% 미만의 A 형 혈우병 환자를 대상으로, 그린모노를 체중 1kg당 50units 정맥주사한 후 약물역동학적 분석을 시행하였다. 약물 투여 후 48시간까지 이상반응을 관찰하고, 약물투여 전 및 48시간 까지 이상반응을 관찰하고, 약물투여 전 및 48시간 후에 일반혈액 검사, 혈액생화학검사, 요검사 등을 측정하여 비교하였다. 제8응고인자 억제인자를 Bethesda assay를 이용하여 투여 전 및 투여 3~7일 후 검사하였다. 결 과 : 15명의 환자중 연구를 완료한 13명의 자료를 분석하였다. Recovery rate는 99±22%(범위, 71~ 136%) 였으며, 2-compartment model을 이용한 beta phase의 반감기는 15.7±6.6시간(범위, 9.7~35.9시간)이었다. 그린모노^ R 투여후 의미있는 이상반응은 없었으며, 검사성적의 의미있는 변화도 발견할 수 없었다. 제8응고인자 억제인자는 시험약 투여 전후 모두 0.6 BU 미만으로 유지되었다. 결 론: 그린모노^R는 약동학적으로 유효하고, 급성이상 반응이 없어, 임상 이용에유용하리라 생각한다.

Paraquat 중독환자의 초기검사로서 sodium dithionite를 이용한 소변내 paraquat검출의 임상적 의의

윤갑준,임경수,이진웅,김영식,이부수,박덕우,김선만,이강현,황성오,안무업 대한응급의학회 1995 대한응급의학회지 Vol.6 No.1

Background : Mortality from paraquat intoxication depends upon plasma paraquat concentration. To know the severity of paraquat intoxication is important for directing therapeutic modality and predicting prognosis. Sodium dithionite test for urinary paraquat provides an easy and simple method to determine the severity of paraquat intoxication in emergency department. purpose : To determine whether the result urinary paraquat test by sodium dithionite can predict outcome in patients with paraquat intoxication in emergency department. Subjects : 48 patients(male 31, female 17, mean age 37 years) who had exposure to paraquat and presented within 24 hours after exposure. Result : Thirty five patients were positive in paraquat urine test and thirteen patients were negative. Clinical manifestations were more severe in positive patients than in negatives. Complication was much more in positives than in negatives. 28 of 35 patients(80%) in positives and 2 of 13 patients(15%) in negatives died. Conclusion : Positive test for urinary paraquat is associated with high mortality and morbidity from paraquat intoxication, and qualitative test for urinary paraquat by sodium dithionite is an useful method to determine the severity of paraquat intoxication in emergency department.

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.

관동맥질환에서 각종 지질 및 지단백의 변화

황석순,김권배,손수인,서영숙,김기식,김윤년 啓明大學校 醫科大學 1990 계명의대학술지 Vol.9 No.3

To evaluate the relationship between coronary artery disease(CAD) and the various levels of lipid and lipoproteins, we performed coronary angiography to the patient, who were suspected coronary artery disease from January 1988 to August 1989. And compared it with normal control group. The number of control group were 41(21 men, 20 women), and the patient group were 52(42 men, 10 women). The age was not differ between two groups. The results were as follows; 1. In CAD group, the plasma concentration of total lipid, triglyceride, total cholesterol, phosphlipid, and TC/HDL ratio were significantly higher than in control group. But, though, the concentration of HDL was lower in CAD group, had no significant difference between two groups. 2. The severity of CAD were well correlated with total lipid, cholesterol, LDL, trigylceride, phospholipid, TC/HDL, LDL/HDL levels. HDL level didnt's show significant correlation with the degree of CAD. We concluded that total lipid, cholesterol, trigylceride TC/LDL ratio were valuable markers of CAD in Korean, but futhur studies of lipoproteiins and other risk factors in the large population will be recommended.

두가지 혈류 유발방법에 의한 새로운 심폐소생술(이중 혈류 유발 심폐소생술)장치의 개발

황성오,김현,조준휘,오범진,임종천,최경훈,윤정한,이승환,김영식,이강현,이윤선 大韓應急醫學會 1999 대한응급의학회지 Vol.10 No.2

Background: There have been many efforts to augment blood flow during cardiopulmonary resuscitation. These efforts have focused on maximizing the effect of cardiac pump or thoracic pump alone. However, considering that the heart is the biggest blood reservoir and increase of intrathoracic pressure can generate blood flow, simultaneous exploitation of both mechanisms may have synergistic effect. We hypothesized that simultaneous chest constriction in addition to sternal compression by standard CPR may have additive hemodynamic effects by preventing deformation of the chest and increase of intrathoracic pressure. Methods and results: we built a new mechanical device to perform compression and thoracic constriction simultaneously. The device consists of two main elements. Piston in the center is to depress the sternum. Strap is to constrict the thorax circumferentially. Strap is attached to both sides of the piston. When the piston is pushed down, it depresses the sternum and pulls on the thoracic strap. To determine strap width to produce optimal hemodynamic effect, we measured hemodynamic parameters with variable widths of strap in two dogs after induction of ventricular fibrillation. Result of the experiment showed that 10cm wide strap was determined to be most effective. We also determined optimal depth of compression to produce maximal hemodynamic effect with animal experiments using two dogs. Animal experiments showed that the highest aortic pressure could be generated when the stemum was depressed to 5 cm. Cardiopulmonary resusciation using a new device could generate higher systolic aortic pressure, coronary perfusion pressure and end-tidal carbon dioxide tension in comparison with standard cardiopulmonary resuscitation in a pilot animal study using two dogs. Conclusion: New cardiopulmonary resuscitation method using a mechanical device designed by us could perform sternal compression and simultaneous thoracic constriction, and generate better hemodynamic effects than standard cardiopulmonary resuscitation in pilot animal experiments.

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.