Effect of Cooling Rate on Mechanical and Electrical Properties of Cu-TiB₂ by Turbulent In-Situ Mixing Process

Park, J.S.,Yun, J.H,Park, Young Do,Park, Yong Ho,Cho, Kyung Mok,Park, Ik Min Scitec Publications Ltd. 2007 Solid State Phenomena Vol.119 No.-

<P>A copper matrix composite reinforced with in situ TiB2 nanoparticle was successfully fabricated by tubulent in-situ mixing process. The microstructure, mechanical and electrical properties of the in situ composite were investigated. The results showed that the in situ formed TiB2 particles, in which size varying from about 50nm to 200nm, exhibited a homogenous dispersion in the copper matrix. It is shown that the interface between the nanoscale particles and the matrix was clean without a transitional layer. Because of the reinforcement, the hardness and Young’s Modulus of the composite improved with increment of cooling rate. Moreover, the in situ Cu-TiB2 composite exhibited higher electrical conductivity with increasing of cooling rate.</P>

골든 리트리버 종의 전지 원위부에서 발생한 지방종의 수술적 치료 1례

박정희,신영지,김영실,조성환,정성목 忠南大學校 獸醫科大學 動物醫科學硏究所 2005 動物醫科學硏究誌 Vol.13 No.-

A 3-year-old intact female Golden retriever dog with a history of increasing mass on the cranial surface of the left distal forelimb was referred to Veterinary Medical Teaching Hospital of Chungnam National University. On the physical examination, the patient had normal gait and no pain associated with the mass. The mass was a little fluctuant and multilobulated on palpation. On fine needle aspiration cytology examination, it was revealed clear lipid droplets, few peripheral blood cells and large number of well-differentiated adipocytes. The mass was surgically removed beneath redial nerve and superficial cephalic vein. During surgical resection, there was no evidence of invasion into muscles or fascia. On the basis of histopathological examination, it was diagnosed as lipoma. There has no evidence of recurrence of lipoma for six months.

" The Korean Journal of Chemical Engineering " 게재 논문 요약 : Processabilities & Mechanical Properties of the Biodegradable LDPE / Modified Starch Blends

Young Jin Kim,Yong Man Lee,Hyang Mok Lee,O Ok Park 한국화학공학회 1994 NICE Vol.12 No.5

N/A An investigation of the biodegradable polymers based on starch has been accomplished. Starch needs to be modified before blending with low density polyethylene(LDPE) because of its hydrophilicity. Three kinds of modification methods were applied to obtain the compatibility to starch-LDPE blends. The first one was the esterification of the hydroxyl group of starch with acetic anhydride. The second was the copolymerization of actylonitrile and styrene onto starch. The last was the esterification reaction of the hydroxyl group of starch with three kinds of ionomers. The tensile strength, % elongation, Young`s modulus, and shear viscosities of blends of the modified starch and LDPE were examined. Ionomer-treated starch showed better compatibility with LDPE to give better performances than other blends.

作文 硏究의 最近 動向과 展望

朴泳穆 弘益大學校 敎育硏究所 1995 敎育硏究論叢 Vol.- No.12

The purpose of this study is to trace the emergence of composition studies as one partof a more general intellectual history concerning the problems of meaning in discourse, and to summarize the trends and perspectives of composition studies. The study of rhetoric generated not only an elaborate system for investigating language practices but also theoretical questions about the relationship of language to knowledge. The system of classical rhetoric was too powerful to be limited to to the few forms of public speaaking to which it was originally applied, and the questions about language ans knowledge rasied by classical rhetoricians were never to be put to rest. After the classical rhetoric period, all forms fo discourse ans symbolic communication can be reduced within its scope. The history of rhetoric is the story of long struggle to understand the relationship between discourse and knowledge, communication and its effects, language and experience. Recent developments in composition studies as well as both critical and linguistic theories have parraled each other in fundamental ways. The 1950s were largely a period of formalism. In compositon, learning to write meant learning to avoid text errors. Formalis assumed an objectivity of text elements, contending that all important issues about text and text meaning could be adressed through analysis of text elements and their inter-relationship. Evidence concerning language processes such as writing, reading, and thinking was held to be unobjective, unreliable, and spurious. In the late 1960, formalist conceptions of composition came under attack and began to wane, and scholars began to think of writing not in terms of text or products but rather in terms of the cognitive processes of writing. This view of language as a cognitive, constructive process motivated writing scholars to reconceptualize writing as dynamic processes of constructing meaning. In this constructivist view, language orders and gives shape and meaning to experience. The meaning were said to be generated and then stored as mental representation. In the 1980s, the cognitive studies supplemented by social analysis that proved the character of interpretive and discourse communities and investigated the dialogical nature of written communication. This social reorientation of the field demanded that composition scholars reevaluate sorne pet of cognitivist assumptions that had virtually swept the field by the early 1980s. Thus writing scholars began to interprete the different genres of academic writing ain terms of didcourse communities to describe the social and historical nature of writing. They suggest that individual writers compose not in isolation but as members of communities whose discourse practices constrain the way they structure meaning. Thus the problem students face in writing could be explained by their lack opf familiarity with the forms and conventions of academic discourses.

쓰기 영역 교육과정 설계의 원리와 절차

박영목 弘益大學校 敎育硏究所 1997 敎育硏究論叢 Vol.- No.14

The purpose of this study is to investigate the principle and procedure of systematic design of Korean writing program. Language is the most powerful tool we have for representing the world to ourselves to the world. Language is not only a mans of communication, it is basic instrument of thought, a defining feature of culture, and important mark of individual identity. Encouraging and enabling students to learn to use written language effectively is one of our society's most important tasks. The writing curriculum mainly contain purpose dimension, content dimension, and development dimension. The purpose dimension adresses the question of why students learn written communication skills. It considers the range of motives, reasons, and desired outcomes, or the ends to which direct our teaching writing. Students should use written language for a variety of purposes, such as to learn, to express ideas, to convey information, to pursuade others, to note things we observe, or to engage with others socially. The act of writing may involve several of these different purposes. The content dimension adresses what students should know and be able to do with writing curriculum. This includes knowledge of written texts and of the processes involved in creating such texts. The development dimension focuses on how learners develop competencies in the writing.

개에서 피지선 과형성의 진단 및 치료 증례

박희서,손화영,정성목,송근호,조종기,이영원,신상태,김명철,김덕환,박성준 충남대학교 수의과대학 동물의과학연구소 2004 動物醫科學硏究誌 Vol.12 No.-

An eleven year old castrated male Maltese was presented to the Veterinary Medical Teaching Hospital of Chungnam National University. In physical examination, approximately 0.5 cm round mass was observed on tail base. This small elevated mass has also shown alopecic and firm configuration. It was differentially diagnosed as sebaceous adenoma and hyperplasia by fine needle aspiration. After surgical removal, the sample was diagnosed as sebaceous hyperplasia by histopathological examination. It has not yet shown any signs of recurrence and prognosis has teen good.

作文活動 過程에서의 社會認知的 意味 協商

朴泳穆 弘益大學校 敎育硏究所 2001 敎育硏究論叢 Vol.- No.18

Writing is a kind of social cognitive act. Writers construct meaning within the broader context of a social and cultural context of language and discourse conventions. And also writers construct meaning within the immediate context of general purposes, specific goals, and activated knowledge linked to the task at hand. Writers build socially shaped, individually formed meanings. In some circumstances, the processes of constructing meaning grow into an active negotiation among some of the multiple forces and conflicts that shape meaning, and writers are forced to turn conscious attention to dealing with the options, constraints, and conflicts that would shape meaning. At these points of conflict and decision, meaning can be actively negotiated. The process of constructing negotiated meaning comes into play for a writer when the process of meaning making is subject to converging constraints and conflict, and when a writer turns his/her attention at some level of awareness to negotiating the problematic cognitive and social situation. In the processes of constructing meaning, negotiation begins with acts of interpretation. After interpretation with the expectations of others, the meaning of key words in an assignment, and the recognition of his/her role as a writer, writers negotiate with some of the constraints on how they select, organize, and connect ideas. After negotiation, writers reflect not only on meaning they create, but also on their own goals, assumptions, strategies, and attitudes of making meaning. The negotiation strategies can be used as effective means for collaborative writing. The collaborative writing fits for the twenty-first century classroom because it alters the traditional teaching environment and places the student in the center. With a goal of the whole being greater than the sum of its parts, cooperation and negotiation replace working alone and competition between individuals. Throughout the collaborative writing, students would learn how to determine questions and find answers, how to share their understanding, and how to negotiate with complex problems and constraints. In the processes of collaborative writing, students need to use effective negotiation strategies to resolve conflicts and to reach their goals.

사회 경제적 지위와 의식구조와의 상관 관계 : 대구지역 청소년가장과 일반고교생과의 비교분석 A comparison of Teenage Family Heads with Normal High School Students

박영목 한국복지재단 1988 동광 Vol.85 No.-

Thought, attitude, and behavior of human are always internelated one another. These must be a social and cultural product gained in the course of life. This research studied what kinds of social and environmental factors would influence the two groups: normal high school students and the teenage family heads. The survey consisted of a questionaire which was administered to 112 high school students (55 boys and 57 girls ) and to 80 teenage family heads over the age of 14 selected by Korea Children's Foundation living in Taegu. The questions of the survey were composed of 33 items. The analysis of the result of the survey shows that: 1. The monthly income of 92.9% of the teenage family heads was below 200,000 Won. Because of economic destitution, the teenage family heads seemed deprived of normal hobby life as is shown that only 31.9% of them enjoy watching television and reading books compared to the normal high school students who enjoy computer games, art, and travel (27.6%). 2. As to the health problem, 11.1% of the teenage family heads thought health was their problem while only 1.8% of the normal high school students thought health as their problem. While only 11.7% of the high school students had egony related to employment, family affair, and economy, 67.5% the teenage family heads had agony on these above matters. This indicates that the teenage family heads were severely involved in living problems and they had little concerns on their health problem. 3. Even in the teenager headed families, there was sex discrimination in oppotunity for education as shown in the rate of high school enrollment between male family heads (63%) and female family heads(57.2%). 4. In the psycho-social aspects, 34.1% of the teenage family heads judged their economic problems were due to the shortage of their effort, but 21.5% of the high school students thought that their efforts were in shortage. While 28.8% of the teenage family heads consodered social contribution or service given to society in job selection and value in human life, 35.4% of the high school students quoted economic affluence or social fame (35.4%) as their goal. 52% of the teenage family members or neighbors than that of themselves, but 27.9% of the high school students had more concern about themselves (28.4%). This shows that the high school students are generally individualism oriented but the teenage family heads are colletive and altruist. 5. In the problem of education, in spite of their desire(64.5%) to go to higher educational institutions, the teenage family heads had to give up continuing school and this must be a decisive ractors in reaching out to society. Accordingly, teenage family heads preferred to taking safe occupation such as teacher, nurse, or business firm worker(56.3%) compared with high school students who were interested in the positions available by a long-term investment such as political science, prefessor, or medical fields. This shows that the teenage family heads were reality and existence oriented rather than future concerned. It is likely that their current situation will not easily bettered.

개에서 직장탈의 수술적 치료 1례

박정희,김영실,신영지,박창식,전무형,김명철,정성목 忠南大學校 獸醫科大學 動物醫科學硏究所 2005 動物醫科學硏究誌 Vol.13 No.-

A 3-year old, male Jindo dog was referred with history of tenesmus, dyschezia and recurrent rectal prolapse. On the physical examination, the rectum was prolapsed about 10 cm, congested and necrotized. Fecal incontinence and pain were observed. Complete blood count revealed a mild leukocytosis and there were no remarkable abnormalities in serum biochemistry profiles. It was diagnosed as a rectal prolapse. Rectal resection and anastomosis was performed for necrotic tissue removal. On postoperative fecal smear, protothecosis was observed. Amphotericin B was administered. There has been no evidence of recurrence of rectal prolapse for ten months.

Coating을 시행한 뇌동맥류 파열환자의 예후

박종혁,석종식,목진호,박관,김영백,민병국,황성남,최덕영 대한신경외과학회 1995 Journal of Korean neurosurgical society Vol.24 No.6

In rare occasions in which aneurysmal neck clipping is nearly impossible, coating is employed. During the period from 1985 to 1992, 312 patients with aneurysm underwent surgery ; aneurysmal neck clipping were performed in 284 cases while coating only in 28. The reasons that coating was required were ; wide and broad neck in 13, perforators arising from the neck in 4, neck tearing during dissection in 3, very friable neck in 2, severe adhesion with surrounding structures in 3, and small aneurysm without enough room for clipping in 3. In twenty-three cases, cotton wisp and bioglue were used as coating materials. In another five cases, the aneurysmal wall was reinforced using Surgicel or Gelfoam. Patients were followed for 24 months on average of all the patients. Four had last contact Six died(4 due to rebleeding and 2 due to pneumonia). Fourteen were good and 4 were moderately disabled. There were no rebleeding incidences during first three months' follow-up after coating. We thus concluded that coating an aneurysm offers some protection from rebleeding, particularly when the rebleeding risk period is over.