Correlation Between Primary Si and Silicide Refinement Induced by Ultrasonic Treatment of Multicomponent Al–Si Alloy Containing Ti, Zr, V, and P

Jae‑Gil Jung,Young‑Hee Cho,Tae‑Young Ahn,Jae‑Hee Yoon,Sang‑Hwa Lee,Jung‑Moo Lee 대한금속·재료학회 2019 METALS AND MATERIALS International Vol.25 No.5

The correlation between primary Si and silicide refinement induced by ultrasonic treatment (UST) of multicomponent Al–Sialloy containing Ti, Zr, V, and P was investigated. UST significantly refined the primary Si phase owing to cavitation-inducedwetting and deagglomeration of MgAl2O4particles. Lowering the UST finish temperature caused deterioration of the degreeof primary Si refinement, instead leading to silicide refinement. Cavitation-induced silicide nucleation on wetted MgAl2O4consumed the MgAl2O4particles, particularly in the case of primary Si nucleation. Similarly, the formation of an AlP phaseon the silicide phase reduced the nucleation efficiency of the AlP phase. Poisoning of the MgAl2O4and AlP phases by thesilicide phase was responsible for the deterioration in primary Si refinement. Room-temperature tensile strength and hightemperatureelongation were increased by UST and were dependent on the size of primary Si.

보수 및 진보 정부 시기별 정부예산에 관한 사회적 인식과 언론의 프레임 비교 분석

이재무 ( Jae Moo Lee ) 고려대학교 정부학연구소 2021 정부학연구 Vol.27 No.3

본 연구는 사회연결망서비스(SNS)를 중심으로 한 사회적 인식과 언론의 뉴스기사 속 프레임 사이의 차이 여부, 집권 정부의 지향 이념에 따른 양상의 차이가 있는지 확인하기 위해 수행되었다. 그에 보수적인 박근혜 정부, 진보적인 문재인 정부 각 시기를 대상으로 빅데이터 자료를 추출하여 텍스트 마이닝 분석을 실시하였다. 분석결과, 박근혜 정부 시기 SNS에서는 간접적 영역에 대한 관심, 부정감성어 선호 등의 특성이 파악되었고, 처우 개선과 효율성 지향에 긍정감성어, 부적절한 처리과정과 태도 비판, 거부감 표현에 부정감성어가 각각 사용되었다. 언론에서는 정치적 행위자와 예산 처리 과정에 집중, 부정감성어 선호 등의 특성이 파악되었고, 처우 개선과 합리성 지향에 긍정감성어, 부적절한 처리과정과 태도, 처리결과에 대한 비판에 부정감성어가 각각 사용되었다. 반면, 문재인 정부 시기 SNS에서는 정부예산에 관한 민감한 반응, 간접적 영역에 대한 관심, 부정감성어 선호 등이 특징으로 확인되었고, 당위성 지향에 긍정감성어, 불법적 행위, 예산 처리 과정과 결과에 대한 비판에 부정감성어가 각각 활용되었다. 언론에서는 정치적 행위자와 예산 처리 과정에 집중, 긍정감성어 선호 등이 특징으로 확인되었고, 일부 관계자의 태도 평가, 효율성 지향에 긍정감성어, 불법적 행위, 일부 관계자의 태도 비판에 부정감성어가 활용되었다. In this study we investigate whether there is a difference between the social perception centered on social networking services (SNS) and the frame of news articles in the media and whether they differ according to the ideology of the ruling government. By text mining using big data, we found that mainly negative emotional words were preferred in SNS during the Park Geun-hye administration, positive emotional words were used for efficiency, and negative emotional words were used to express rejection. In the media, we identified a preference for negative sentiment words, positive sentiment words were used for rationality, and negative sentiment words were used for various kinds of criticism. On the other hand, SNS during the Moon Jae-in government mainly preferred negative emotional words, positive emotional words for justification, and negative emotional words for various kinds of criticism. In the media, we identified a preference for positive sentiment words, which were used for efficiency, and negative sentiment words were used for various kinds of criticism.

지역사회획득 폐렴의 치료지침 권고안

송재훈,정기석,강문원,김도진,배현주,서지영,심태선,안중현,안철민,우준희,이남용,이동건,이미숙,이상무,이영선,이혁민,정두련,지역사회획득 폐렴 치료지침 제정위원회 대한감염학회 2009 감염과 화학요법 Vol.41 No.3

A successful therapy of community-acquired pneumonia requires appropriate empirical antimicrobial therapy. Etiology and antimicrobial susceptibility of major pathogens of pneumonia can differ by country. Therefore, an ideal treatment guideline of community-acquired pneumonia should be based on the studies performed in each country. We developed a treatment guideline for community-acquired pneumonia in immunocompetent adults in Korea. This guideline was developed by the joint committee of the Korean Society for Chemotherapy, the Korean Society of Infectious Diseases, and the Korean Academy of Tuberculosis and Respiratory diseases.

정책사업가로서 한국 대통령의 자질 및 전략 형태에 따른 정책의 결정 양상과 집행 결과에 대한 탐색적 고찰

이재무 ( Jae Moo Lee ) 서울대학교 한국행정연구소 2015 行政論叢 Vol.53 No.2

This study was conducted to determine the relationship between coupled logic and decision methods, which are direct factors of policy making, and political connections, qualifications such as consistency of negotiation skill, and strategies such as structuralization, graded solutions, use of symbolism, coping with conflict coalitions and situations, all of which are greatly needed by the president as the nation’s policy entrepreneur. Accordingly, President Roh Moo-hyun, President Lee Myung-bak, and President Park Geun-hye, who each led changes in policy showing policy succession types, were evaluated and analyzed. The analysis showed that the presidents were negative from the perspective of consistency in combining and accepting differing attributes. In addition, policy entrepreneur structuralization strategies focused on highlighting social interests, but such strategies as graded solutions or use of symbolism have been relatively less used. Besides, coping with conflict coalitions and saw negative behavior, and decision-making was carried out recklessly with the intent of combining political decision-making logic in a combination of different characteristics or states that do not accept the opinion. Therefore, policies determined in accordance with policy implementation both showed negative results. Based on this, this study suggested the need for such presidential efforts as communication and consultation with citizens, setting problem-shooting-oriented policy making according to continued persuasion and by leading through voluntary cooperation.

저장 온도 및 상대습도가 비타민 정제 중 지용성 비타민 함량의 변화에 미치는 영향

김동섭,이재황,김세곤,이동언,박석준,이진희,이강표,최성원,백무열 경희대학교식량자원개발연구소 2007 硏究論文集 Vol.26 No.1

동물원에서 사육중인 Japanese Macaque (Macaca fuscata)에서 Zoletil 마취에 관한 연구

이재일,이수진,홍성혁,신남식,김덕환,박창식,전무형,조종민,김영석,김명철 충남대학교 형질전환복제돼지연구센터 2004 논문집 Vol. No.8

To evaluate the effects of Zoletil (tiletamine-zolazepam) that have been widely used for the chemical restraint and anesthesia of primates, on physiologic alteration, blood gas analysis and anesthetic duration in the Japanese macaque(Macaca fuscata), this study was carried out. Zoleril was administered by intramuscular injection, Evaluation of temperature, heart rate, respiration rate and blood gas analysis were performed before administration ancl at 1,10, 20, 30, 40, 50 and 60 min after administration, and induction and maintenance time was recorded. There was no significant difference in heart rate, PCO₂PO₂after Zolcril administration and temperature, respration rate, pH were significant difference compared with those of before administration, The induction time was 2.5±l.Omin and maintenance time was 86±23.2min. It was considered that Zoletil could he usefully used for the sedation and immobilization of Japanese macaque reared in zoological garden.

운동거리이상의 정량적 평가

이경무,김재욱,이태수,김헌,황준,이주연 大韓再活醫學會 1998 Annals of Rehabilitation Medicine Vol.22 No.2

薄肉鑄物의 硬度및組織에 미치는 鑄物砂의 影響

李載元,權赫茂 충남대학교 공업기술개발연구소 1975 工業技術開發硏究所論文集 Vol.2 No.2

The effects of molding sand permeability on the graphite structure and the hardness in the thin casting ranging from one to ten milimeters in thickness molded with several kinds of carbon equivalent of cast iron were studied and the following results are obtained; (1) In accordance with the increasing of molding sand permeability in the thin casting. (a) the graphite sizes were refined in every specimen experimented (b) the hardnesses of the thin castings ranging from two to ten milimeters in thickness were increased. (2) It is recommendable to use the hypereutectic melt for the thin cast about one milimeter in thickness because of both eutectic and hypoeutectic melt cause the chilled cast and the increase of hardness regardless of the changes in molding sand permeability.

BaTiO₃에서 2차 비정상 입성장

이호용,김재석,허태무,이종봉 선문대학교 1998 공과대학논문집 Vol.1 No.1

Ti-excess BaTiO_(3)를 1360℃와 1370℃ 사이 온도에서 열처리하였을 때, 비정상 입자들이 수 ㎜까지 성장하였다. 이러한 비정상 입자들은 1차 비정상 입성장이 끝난 후에 다시 나타나 이를 2차 비정상 입성장이라고 하였다. 대부분의 2차 비정상 입자들에서 수 십 ㎛ 두께의 (111) 쌍정이 관찰되며, 2차 비정상 입성장은 1360℃와 1370℃ 사이의 온도 범위에서만 일어났다. 이러한 2차 비정상 입성장을 Twin-Plane Re-entrant Edge (TPRE) 성장기구로 설명하였다. When undoped BaTiO_(3) powder of Ti-excess composition was sintered, some abnormal grains appeared and grew to several millimeters at temperatures between 1360℃ and 1370℃. Since it occurred after completion of the first abnormal grain growth, it is called the secondary abnormal grain growth (SAGG). Almost all secondary abnormal grains were observed to contain the (111) double twins of about several tens ㎛ spacing. The SAGG was observed to occur on]y at temperatures between 1360℃ and 1370℃. The SAGG was explained in terms of Twin-Plane Re-entrant Edge (TPRE) growth mechanism.

섬유종류 및 잔골재용적비에 따른 HPFRCC의 공학적 특성에 관한 실험적 연구

이의배,이동혁,나철성,조봉석,김재환,김무한 대한건축학회 2004 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.24 No.1(구조계)

In general, concrete showed brittle fracture but HPFRCC(High Performance fiber reinforced cementitious composite) showed ultra high ductile behavior in the hardened state, because of the fiber bridging properties. So a variety of experiments have being performed to access the performance of HPFRCC recently. In this study, to develope HPFRCC with high ductility and strain capacity, effects of fiber types and sand volume fraction were investigated. And results of this study were as follows; · HPFRCC reinforced with PVA or hybrid fiber were superior to PP or singleness. · Effect of sand volume fraction on HPFRCC reinforced with PP was insignificant.