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Hot Deformation Behavior and Recrystallization Mechanism in an As-Cast CoNi-Based Superalloy
Yong Guan,Yongchang Liu,Zongqing Ma,Huijun Li,Hongyao Yu 대한금속·재료학회 2022 METALS AND MATERIALS International Vol.28 No.6
The hot deformation behavior of as-cast CoNi-based superalloy was investigated by means of hot compression tests. Thecorresponding microstructure evolution after hot deformation was examined by optical microscope, as well as the TEMtechnique. The constitutive equation and processing map as a function of deformation temperature and strain rate were developed. Results show that the efficiency peak of the processing map is 0.38 at the temperature of 1130 °C and the strain rate of0.01 s−1. The discontinuous dynamic recrystallization (DDRX) related to the strain-induced grain boundary migration (SIBM)is the dominant recrystallization mechanism during hot working. Meanwhile, the DRX also occurs by forming sub-grainsaround MC carbides and shear band. In addition, the existence of fine γ′ precipitates are found to retard the recrystallization.
Riccardo Guanà,Salvatore Garofano,Elisabetta Teruzzi,Simona Vinardi,Giulia Carbonaro,Alessia Cerrina,Isabella Morra,Davide Montin,Alessandro Mussa,Jürgen Schleef 대한소아소화기영양학회 2014 Pediatric gastroenterology, hepatology & nutrition Vol.17 No.4
Severe combined immunodeficiency (SCID) is a life-threatening syndrome of recurrent infections and gastro-intestinal alterations due to severe compromise of T cells and B cells. Clinically, most patients present symptoms before the age of 3 months and without intervention SCID usually results in severe infections and death by the age of 2 years. Its association with intestinal anomalies as multiple intestinal atresias (MIA) is rare and worsens the prog-nosis, resulting lethal. We describe the case of a four year-old boy with SCID-MIA. He presented at birth with meco-nium peritonitis, multiple ileal atresias and underwent several intestinal resections. A targeted Sanger sequencing revealed a homozygous 4-bp deletion (c.313ΔTATC; p.Y105fs) in tetratricopeptide repeat domain 7A (TTC7A).He experienced surgical procedures including resection and stricturoplasty. Despite parenteral nutrition-associated liver disease, the patient is surviving at the time of writing the report. Precocious immune system assessment, scrutiny of TTC7A mutations and prompt surgical procedures are crucial in the management.
Riccardo Guanà,Salvatore Garofano,Elisabetta Teruzzi,Simona Vinardi,Giulia Carbonaro,Alessia Cerrina,Isabella Morra,Davide Montin,Alessandro Mussa,Jürgen Schleef 대한소아소화기영양학회 2015 Pediatric gastroenterology, hepatology & nutrition Vol.18 No.1
Severe combined immunodeficiency (SCID) is a life-threatening syndrome of recurrent infections and gastrointestinal alterations due to severe compromise of T cells and B cells. Clinically, most patients present symptoms before the age of 3 months and without intervention SCID usually results in severe infections and death by the age of 2 years. Its association with intestinal anomalies as multiple intestinal atresias (MIA) is rare and worsens the prognosis, resulting lethal. We describe the case of a four year-old boy with SCID-MIA. He presented at birth with meconium peritonitis, multiple ileal atresias and underwent several intestinal resections. A targeted Sanger sequencing revealed a homozygous 4-bp deletion (c.313ΔTATC; p.Y105fs) in tetratricopeptide repeat domain 7A (TTC7A). He experienced surgical procedures including resection and stricturoplasty. Despite parenteral nutrition-associated liver disease, the patient is surviving at the time of writing the report. Precocious immune system assessment, scrutiny of TTC7A mutations and prompt surgical procedures are crucial in the management.
조관식 인제대학교 1990 仁濟論叢 Vol.6 No.1
The threshold and the growth rate of parametric decay of laser are investigated via the throe-fluid theory of the plasma consisting of electrons, positive and negative ions. Landau dampings of electrostatic waves are taken into consideration phenomenologically. The threshold is raised, and the decay process is enhanced near the threshold, while unaffected well above the threshold, by negative ions.
Joseph Conrad의 The Secret Agent 硏究
劉琯鉉 서울産業大學校 1985 논문집 Vol.21 No.1
영국 소설이 20세기에 접어들면서 한 층 더 다양성을 띠게 되는 가운데서 Joseph Conrad의 소설만큼 독창성을 보여주는 소설도 드물다. 그는 아시아와 남북미주와 세계의 바다와 항구들에 관한 넓은 견문과 경험을 바탕으로 하여 외국인으로서 정교하고도 율동적인 영어문체로 Almayer's Folly(1985)를 비롯한 낭만적 이국 정취가 짙게 풍기는 작품들을 계속 발표하였다. 그는 생존 당시에는 물론이고, 지금도, The Nigger of the "Narcissus"(1898), Load Jim(1900), Youth(1902) 등의 작품에서 볼 수 있는 다채로운 바다와 이국 정취로 인하여, 많은 독자들을 확보하고 있다.
조관식 인제대학교 1995 仁濟論叢 Vol.11 No.2
Filamentation of an electromagnetic wave in a plasma with negative ions is treated theoretically through the collisionless three-fluid model. The threshold intensity required by the instability is raised and the growth rate above the threshold is lowered, by negative ions. After all, the filamentation instability may be said to be weakened by the presence of negative ions. However, if the pump intensity is high enough to change the plasma property, the instability growth rate may be enhanced by negative ions. The less the particle mass of negative ions relative to that of positive ions, the more prominent the enhancement.
중국인 학습자의 말하기 대회에 나타난 담화표지 사용 양상 연구
왕관교 배재대학교 주시경교양교육연구소 2017 대학교양교육연구 Vol.2 No.1
요즘 중국인 학습자의 수가 증가하여 중국어권 학습자에 대한 연구도 다른 언어권보다 더 많이 진행되고 있다. 담화표지는 의사소통에서 중요한 역할을 하기 때문에 학계에서 중국인 학습자의 담화표지 사용 양상에 대하여 관심이 많아지고 있다. 본 연구는 중국인 학습자를 대상으로 하여 말하기 대회에 나타난 담화표지 사용 양상을 파악하는 것을 목적으로 한다. 먼저, 말하기 대회의 동영상을 수집하고 전사함으로써 연구자료를 형성한다. 연구 자료에 나타난 담화표지를 조사 분석하고 출현빈도를 통계하였다. 그리고 담화표지의 유형을 형태적, 기능적으로 구분하여 사용 양상을 살펴보았다. 연구를 통하여 중국인 학습자는 화제 연결, 화제 전환과 같은 화제 층위의 담화표지를 가장 많이 사용하고 ‘-뿐만 아니라’, ‘그리고’등 전형적인 담화표지가 반복적으로 사용하였으며, 동일한 담화표지라도 다른 기능으로 사용하는 상황이 많다는 것을 밝혔다. 마지막으로, 본 연구 에서 한국어 교육에 대해 화제 연결, 화제 전환의 기능을 나타나는 담화표지를 강조하고 구어체 담화표지를 많이 도입할 것을 시사한다. Recently, the research on Chinese learners who speak Korean as foreign language has taken the top spot in comparison with other linguistic communities, due to the increasing population of such Korean-language speakers from China. Admittedly, the importance of discourse markers is known to all, which gives rise to the curiosity from academic world on how those discourse markers are employed by Chinese learners of Korean. This study focuses on Chinese learners to figure out how those discourse markers are used in speaking contests. In order to form the research materials, the frist step of this research is to collect videos of various speaking contests and transform it into files in a way of phonetic transcription. Then this study captures all those discourse markers and calculates the frequency of all kinds of discourse markers in research materials. Moreover, this study distinguishes discourse markers by form and function in the context of the communication. What this analysis find are that a) the most frequently-used type of discourse markers are topic connection one and topic transition one in the topic level; b) the frequent use some typical discourse markers such as "-뿐만 아니라”, "그리고”etc; c) one kind of discourse markers are often can be used in different situations. Finally, this study calls on the more emphasis on discourse markers of topic connection and topic transition in Korean language education, suggesting to import more colloquial discourse markers on such education.
음이온이 포함된 다이온 플라즈마의 충돌없는 삼유체 모형에서의 파동들
조관식 인제대학교 1987 仁濟論叢 Vol.3 No.2
In the collisionless three-fluid model of the multi-ion plasma composed of electrons, positive ions, and negative ions, analytical solutions of the dispersion relation are obtained using the perturbation method. Effects of the relative population ratios between negative ions and electrons on the propagations of the various waves are investigated. Thus seven solutions are shown to be peculiar to the presence of negative ions, as compared with the other multi-ion plasmas without negative ions. In particular, the usual ion acoustic wave ω=kvs is obtained even though ions and electrons have nearly the same temperatures, when the electron pupulation ratio is much less than one. Furthermore the plasma oscillation ω2= ωe2+ ω+2+ ω_2 incorporating all the three species is obtained when the electron population ratio is comparable to electron to ion mass ratio.
劉琯鉉 서울産業大學校 1990 논문집 Vol.31 No.1
This study is about Lyotard's essay “Answering the Question: What is Postmodernism?” Many definitions of postmodernism focus on its nature as the aftermath of the industrial age in the Western culture. Lyotard, in his essay, discursively observes how reality in art and literature is ebbing in the present Western society which is variously called media society, consumer society, bureaucratic society of controlled consumption, postindustrial society, etc. He puts under suspicion Habermas who demands communicative consensus, believing that it results in totality and terror. And he defends artistic experimentation of avantgardes, basing his arguments on Kant's aesthetics of the sublime.