Fe-0.7%C-2.3%Si강의 미세조직과 기계적 성질에 미치는 잔류 오스테나이트 변태 거동

손제영 ( Je Young Son ),권도영 ( Do Young Kwon ),김지훈 ( Ji Hun Kim ),김원배 ( Won Bae Kim ),예병준 ( Byung Joon Ye ) 한국주조공학회 2012 한국주조공학회지 Vol.32 No.3

This steel has been synthesized integrating concepts from Austempering Ductile Cast Iron (ADI) technology. While ADI has excellent mechanical and physical properties, the Young`s modules of ADI is approximately 20% lower than steel. In addition, the presence of graphite nodules in ADI can be sites of crack initiation, where fracture takes place at graphite matrix interface. Because of this limitations of ADI, there has been a growing interest in austempered steels as structural materials in resent years. In this investigation, a new steel with microstructure composed of ferrite and austenite and with simultaneous high tensile strength (1,150MPa) and high ductility (33%) was developed. The goal of this investigation is to obtain a better understanding of deformation and transformation behaviour in high carbon retained austenite(γHC) and over-saturated ferrite(α) during the plastic deformation. A detailed study of the microstructure of this steel was carried out by means of X-ray diffraction (XRD) and electron back scattering diffraction (EBSD) technic. In this way it was shown that BCC phase (BCC) took up the larger part of the nominal strain whereas the a part of retained austenite responded to the mechanincal load by partial martensite transformation, and misorientation change in the retained austenite after plastic strain could be attributed to the large elongation.

장기간 항갑상선제 투여 후 임의 중단 뒤 재복용시 발생한 무과립구증 1 예

김승만;김태영;박수영;배영환;서영경 정은주;김태균;권민정;박정현;이순희 인제대학교 2011 仁濟醫學 Vol.32 No.-

Agranulocytosis, one of the major side effects of antithyroid a gents, probably occurs in less than 0.25% of cases treated with antithyroid agents. It usually occurs within the first several weeks or months after the initiation of therapy, when drug dosage is higher. Most reported cases of agranulocytosis have occurred during the first 3 months of therapy. We describe here a rare case that did not experience the side effect for 6 years of antithyroid agent treatment but presented with agranulocytosis in one month after re-exposure. It suggests that the major side effect such as agranulocytosis can occur in patients who had undergone prior uneventful antithyroid drug therapy.

중ㆍ고년여성의 하지 근 기능과 요부 및 대퇴근 횡단면적의 상관관계

김창근,이수경,권영우,박정배 한국체육대학교 체육과학연구소 2001 국제학술대회논문집 Vol.20 No.1

The purpose of the present study was to investigate the relationship between isokinetic muscle function and muscle cross-sectional area (CSA). Twelve women participated in the present study, divided young (n=6, 23.7±1.9 year) and elderly women (n=6, 60.3±6.8 year). Isokinetic strength (power, strength, endurance) and CSA (psoas major and thigh muscles) measured with dynamometer and computerized tomograph, respectively. Cross-sectional area of psoas major muscle in elderly group revealed markedly smaller than in young group, but thigh muscle was not the case. Muscle CSA in young women correlated between power and endurance and psoas major muscle, as well as between muscle strength and CSA of thigh muscle. But no correlation occurred between strength and cross sectional area, except endurance which was highly correlated between CSA and endurance. In conclusion, aging decreases muscle function and CSA. Partially muscle strength correlated with muscle CSA in young women, but no correlation occurred in elderly women. Further study needed to elucidate the exact mechanism related to aging muscle with muscle density and neuromuscular function.

Direct effectiveness of pneumococcal polysaccharide vaccine against invasive pneumococcal disease and non-bacteremic pneumococcal pneumonia in elderly population in the era of pneumococcal conjugate vaccine: A case-control study

Kim, Jong Hun,Chun, Byung Chul,Song, Joon Young,Kim, Hyo Youl,Bae, In-Gyu,Kim, Dong-Min,Choi, Young Hwa,Jun, Yoon Hee,Choi, Won Suk,Kang, Seong Hee,Kwon, Hyun Hee,Jeong, Hye Won,Kee, Sae Yoon,Hur, Jia Elsevier Ltd. 2019 Vaccine Vol. No.

<P><B>Abstract</B></P> <P><B>Background</B></P> <P>While herd effects and serotype replacement by childhood pneumococcal protein conjugated vaccines (PCVs) continues to accumulate worldwide, direct effectiveness of 23-valent pneumococcal polysaccharide vaccine (PPV23) against pneumococcal diseases in the elderly has been challenged. We estimated the direct effectiveness of PPV23 in the elderly population.</P> <P><B>Methods</B></P> <P>For a hospital-based case-control study, cases of invasive pneumococcal disease (IPD) and non-bacteremic pneumococcal pneumonia (NBPP) (adults ≥ 65 years) were identified in 14 hospitals participated in the pneumococcal surveillance program from March 2013 to October 2015, following implementation of PPV23 national immunization program (NIP) for the elderly in the Republic of Korea. Controls matched by age, sex, and hospital were selected at ratios of 1:2 (IPD) or 1:1 (NBPP). Clinical data and vaccination records were collected. Vaccine effectiveness was calculated as (1-adjusted odds ratio) × 100.</P> <P><B>Results</B></P> <P>We enrolled 148 IPD and 557 NBPP cases, and 295 IPD and 557 NBPP controls for analyses. Overall effectiveness of PPV23 against IPD was 28.5% [95% confidence interval (CI) −5.8%–51.6%] and against NBPP was 10.2% (-15.1-30.6) in all patients ≥ 65 years. However, in subgroup analysis of patients aged 65–74 years, PPV23 was protective against IPD [effectiveness 57.4% (19.4–77.5)] and against NBPP [effectiveness 35.0% (2.3–56.7)]. Furthermore, serotype-specific effectiveness of PPV23 against IPD was 90.6% (27.6–98.8) for PPV23-unique serotypes and 81.3% (38.6–94.3) for PPV23 serotypes excluding serotype 3.</P> <P><B>Conclusions</B></P> <P>This study indicates that PPV23 with broad serotype coverage might be beneficial in preventing IPD and NBPP due to non-PCV13 serotypes in the young-elderly, with potentially increasing effectiveness in the setting of childhood PCV NIP.</P> <P><B>Highlights</B></P> <P> <UL> <LI> National immunization program for PPV23 for the elderly was implemented in Korea. </LI> <LI> PPV23 was effective against IPD and NBPP for young elderly patients aged 65–74. </LI> <LI> Effectiveness of PPV23 against IPD was higher for PPV23 unique serotypes. </LI> <LI> PPV23 was non-protective against IPD caused by PCV13 serotypes. </LI> </UL> </P>

STAD 학습모형에 기반한 대학 프로그래밍 수업모형 개발

배영권 이화여자대학교 교육과학연구소 2007 교육과학연구 Vol.38 No.3

본 연구는 대학교 프로그래밍 수업에서 학생들의 문제해결력을 신장시키기 위한STAD 학습모형에 기반한 프로그래밍 수업모형을 제시하는 데 목적이 있다. 이를 위해 본 연구에서는 먼저 대학수업에서 프로그래밍 수업이 갖는 의미를 살펴보고 그 문제점을 탐색하고자 하였다. 이를 통해 기존 대학의 프로그래밍 수업은 단순한 예제를따라하는 방식이나 프로그래밍의 단순한 형식과 구조를 배우는 등 교육 내용과 방법상의 문제점을 가지고 있음을 알 수 있었다. 이에 본 프로그래밍 수업모형에서는 프로그래밍 학습경험에 기초한 그룹형성과 동료 교수, 교수자의 지속적인 평가와 피드백을강조하여 모형을 제시하였고 궁극적으로는 제시된 수업모형을 통해 학생들의 문제해결력을 신장시킬 수 있는 가능성을 탐색하였다. 그리고 본 연구에서 제안한 수업모형을 대학교에서 1학기 동안 적용하여 본 결과 제시된 수업모형이 기존 프로그래밍 수업의 문제점을 극복하는 데 도움을 준 것으로 평가되었다. This study purposed to propose a programming instruction model based onSTAD learning model in order to enhance university students’ problem solvingabilities in programming class. For this purpose, we reviewed the meanings ofprogramming instruction in university, and examined problems in programminginstruction. Through this study, it was found that existing programminginstruction in university have problems in the contents and methods of education,following simple exercises, learning simple forms and structures of programming,etc. Thus, we proposed a programming instruction model that forms groups basedon experience in programming learning and emphasizes continuous evaluation andfeedback by peer teaching and teachers, and explored the possibility of the modelin enhancing students’ problem solving abilities. What is more, when theproposed instruction model was applied to students at University for asemester, it was found helpful to overcome problems in existing programminginstruction.

거대 난소 종양의 염전 1예

김미영,이해혁,유애리,박정희,이임순,정수호,고은석,레앙소팥,배동한,김태희,이권해 순천향의학연구소 2008 Journal of Soonchunhyang Medical Science Vol.14 No.1

..

노인틀니 보험급여를 위한 건강보험재정추계연구

권호근,김영남,정기호,송근배,박덕영 대한구강보건학회 2003 大韓口腔保健學會誌 Vol.27 No.3

The purpose of this study is to estimate the National Health Insurance budget needed for the Korean elderly's denture service coverage. For more exact estimating the budget, denture need and demand were calculated by using 2000 National Oral Health Survey data. The results were summarized as follows ; 1. Over 65 years old, full denture and partial denture need per arch were each 8.5% and 16.8%. And over 70 years old, those were each 11.3% and 17.8%. 2. Over 65 years old, full denture and partial denture demand per arch were each 22.8% and 21.2%. And over 70 years old, those were each 27.%% and 21.1%. 3. Based on the denture need, the health insurance budget needed in the first operative year was about 955.4 billion won, over 65 years old and about 644.2 billion won, over 70 years old. 4. Based on the denture demand(wear), the health insurance budget needed in the first operative year was about 207.5 billion won, over 65 years old and was about 151.6 billion won, over 70 years old. If health insurance policy of elderly's denture service coverage is performed, actual denture wear rate is going to increase, and the budget needed is also increasing. Because current National Health Insurance budget status is poor, it is difficult to execute health insurance coverage for elderly's denture service. Therefore we suggest that health insurance coverage for preventive service is to be considered in order to reducing denture need in the long term view.

은행잎 추출물이 협심증 환자의 내피 세포 기능에 미치는 장단기 효과

배장호,김기식,이인규,김여희,김민수,김기영,남창욱,김윤년,김권배,정시전 대한순환기학회 1999 Korean Circulation Journal Vol.29 No.9

SOI 특성분석을 위한 SIS 커패시터의 CV 해석

배영호,권영규 위덕대학교 부설 전자기술연구소 1997 전자기술연구소 논문집 : 위덕대 Vol.1 No.1

SIS 구조의 CV 특성을 해석하고 이를 이용하여 SOI의 특성을 분석하는 방법을 제안하였다. SIS 구조의 CV 기본 방정식으로부터 매몰산화층의 두께, 계면트랩밀도, 도핑농도를 계산하는 식을 유도하였다. 특히 미드갭 커패시턴스의 개념을 도입함으로써 평탄대역전압이 정의되지 않아서 현재까지 분석하기 어려웠던 매몰산화층 내의 유효산화막전하를 분석할 수 있는 방법을 제시하였다. 산소이온주입법으로 제조된 SIMOX SOI 웨이퍼를 이용하여 실제로 SIS 커패시터를 제조하고 이것의 고주파 및 저주파의 CV 특성을 측정하고 이 결과를 이용하여 각종 파라미터를 추출하였다. The characterization method of SOI structure using SIS CV characteristics was proposed. The parameters of SOI structure were extracted by analyzing the capacitance voltage model of SIS structure. The real SIS capacitor was fabricated using SIMOX SOI wafer. High frequency and low frequency CV characteristics was measured. Analyzing the results, thickness of buried oxide, interface trap densities, doping concentration was obtained. Oxide charges in the buried oxide layer, such as mobile charge, were easily calculated by introducing the midgap voltage concepts.

지식관리시스템의 설계 및 구축

배재학,김영권,남철기,신필순 울산대학교 2000 공학연구논문집 Vol.31 No.1

기업의 지적자산을 직접적인 경영 대상으로 보는 새로운 인식이, 최근 지식경영이라는 이름으로 확산되고 있다. 이에 본 논문에서는, 실제 중소기업에서 지식관리와 재사용에 활용할 정보시스템의 설계 및 구축을 시도하였다. 구체적으로는, 지식관리 시스템 개발시 고려해야 할 사항, 개발방향 설정, 그리고 개발 방법론 등을 검토하였다. 이를 토대로 지식관리 시스템의 원형을 구현하였다. There is growing recognition by the name of knowlege management that tintellectual assets are the management objects that should be directly managed. In this paper, we try to design and implement an information system for knowledge management and reuse in small-to-medium-sized enterprises. In doing this, we study initial considerations, development directions ans methodology for knowledge management systems. Based on the study, a prototype of the knowledge management system is constructed and described here.