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.

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.

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.

아시아 12개국의 응급의학 실태에 대한 연구 조사

정제명,왕순주,안무업,박재형,유기철,박준석,강재구,제프리 아놀드 대한응급의학회 1999 대한응급의학회지 Vol.10 No.4

Background : To assess the current level of development of emergency medicine (EM) systems in Asia. Method : Survey of EM professionals from 12 Asian countries during a 90-day period from August to November 1998. 12 EM professionals from 12 Asian countries completed the survey. All participants were physicians. 7 participants (58%) gave presentations at an international EM conference during the study period. Respondents completed a 103 question questionnaire about the status of EM specialty, academic, patient care, information and management systems and the factors influencing the future of EM in their countries. Results : 92% of respondents stated that their countries have hospital-based emergency departments (ED). More than 80% of respondents reported that their countries have EMS systems and ED systems for trauma care and patient transfer. More than 70% stated that their countries have national EM organizations, EM research, national EMS activation phone numbers, ED systems for pediatric emergency care, emergency physician (EP) training in ACLS and ATLS and peer review. More than 60% reported official recognition of EM as an independent specialty status, ED triage systems and systems for customer service. More than 50% reported EM residency training programs, EM journals and EP ability to perform rapid sequence intubation (RSI). 50% reported EP ability to perform thrombolysis for acute MI and 33% reported EP ultrasonography. 92% felt that a lack of funding posed a moderate or great obstacle to the future development of EM in their countries. Conclusions : Many essential systems of EM now exist throughout Asia. In the systems of administration and emergency medical information in many countries, there are some parts to be developed further.

레이저 클래딩 중첩도가 표면특성에 미치는 영향

이제훈, 서무홍, 한유희 한국레이저가공학회 2000 한국레이저가공학회지 Vol.3 No.1

A 4kW RS840 CO2 laser with a powder auto-feeding apparatus has been used to deposit multiple overlapping tracks of Ni-base superalloy on to low carbon steel. It was found that the surface roughness(turbulence) of an overlapped cladding layer decreased with the increase of the overlapping ratio in an oscillating manner. When the overlapping ratio had values of 0.62, the surface turbulence was lowest. Overlapping ratio offer significant potential for improvement of materials surface properties such as corrosion performance and wear resistance. This paper reports that the overlapping ratio shows best corrosion resistance. The tensile residual stresses generated at the higher overlapping ratio(>0.45) and the element concentration of Fe increased in the surface layer at the lower overlapping ratio(<0.45) may lead to worse corrosion resistance.

뇌 자기공명영상상 뇌량 병변의 호전을 보인 Marchiafava-Bignami병 1예

정재훈,성기범,안무영,신현길,박형국 대한신경과학회 1999 대한신경과학회지 Vol.17 No.5

시상출혈 환자의 지연 순목반사

박종무,김호진,윤창호,이용석,노재규,이광우 대한신경과학회 1999 대한신경과학회지 Vol.17 No.5

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

석회 흔입 점토의 강도 특성

여재호,권무남,구정민,김현기 경북대학교 농업과학기술연구소 2000 慶北大農學誌 Vol.18 No.-

This study was conducted to investigate most effective the optimum lime content for lime-clay modification. To achieve the aim, characteristics of compaction and compressive strength were tested by adding of 0, 5, 10, 15 and 20% lime (Hydrated lime) of dry weight of the clay. Distilled water was added 10, 15, 20 and 25% of dry weight of lime-clay mixture. In this test, the compressive strength of the specimens was measured according to the following curing period : 7, 21, 28, 35 and 49 days. The results are as follows. (1) As lime additive increased, the optimum moisture content of lime-clay mixture was increased and the maximum dry density was decreased. (2) the soil mixture of 20% of the moisture content and 10% of lime additive was shown the maximum compressive strength. (3) As curing period longer, the compressive strength was increased but after 21 curing days, the increasing rate of compressive strength was low as compared with earlier its value. (4) In the range of 20% of the moisture content, compressive strength of mixture of 10% lime additive increased twice compared with that of mixture of 0% lime additive. (5) All of the lime-clay are possible to use for an sub-base material and 20% of moisture content of lime-clay mixture is possible to use for a base material.

Vibrio vulnificus에 의한 패혈증 3예

김신무,김유현,신상희,오재세,강숙희,윤여안,이화재,김영옥 대한임상병리사협회 1986 임상병리사회지 Vol.18 No.1