• 제목/요약/키워드: 敍述

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Creating Highly Sensitive and Selective Biochip Sensors for the Detection of Organophosphorus/carbamate Pesticides (고감도 및 고선택성의 유기인계/카바메이트계 농약 검출용 바이오칩 센서)

  • Sim, Hyerim;Kim, Suhee;Lee, Jaeyoung;Lee, Hye Jin
    • Applied Chemistry for Engineering
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    • v.20 no.6
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    • pp.571-580
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    • 2009
  • Biochip sensing technologies offering in-situ, fast and real-time measurements in addition to portability can be powerfully utilized in a wide spectrum of research areas including environmental science, food science, medical diagnostics and drug development. In this article, we introduce current research trends and economic aspects of the development of various optical biochip technologies for the analysis of organophosphorus/carbamate pesticides in environmental samples, which is of global importance with serious consequences for both current and future generations. In particular, we will highlight recent efforts made in the creation of highly sensitive and selective optical biochip sensors in conjunction with nanobiotechnologies and microfabrication for the rapid detection of organophosphorus/carbamate pesticides.

Superoxide Anion Radical: Principle and Application (슈퍼옥사이드 음이온 라디칼 화학과 응용)

  • Kwon, Bum Gun;Yoon, Jeyong
    • Applied Chemistry for Engineering
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    • v.20 no.6
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    • pp.593-602
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    • 2009
  • For a long time, there is much interest in the superoxide anion radical as one of reactive oxygen species (ROS) not only in the basic research field of chemistry and physics but also in the life science (or biotechnology). Recently, it is becoming ever more vital since the toxic property of nanomaterials as well as advanced oxidation processes (AOP) frequently employed for controlling pollutants are connected with the formation of superoxide anion radicals. Despite many researches on superoxide anion radical, the quantitative information of its presence and its detailed reaction mechanism in aqueous environments remains largely unclear, causing the controversy and confusion. In this review paper, we attempted to summarize the physicochemical property, mechanisms, and applications of superoxide anion radical. In addition, we briefly incorporated the important application of superoxide anion radical in AOP, nanomaterials, and life science (or biotechnology).

Two Perspectives in Developing a Visualization Environment (시각화 환경의 개발에 대한 두 관점)

  • 고상숙
    • Journal of Educational Research in Mathematics
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    • v.8 no.2
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    • pp.745-752
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    • 1998
  • 컴퓨터의 급속한 보급으로 시각화는 수학 교육자사이의 논의에 자주 등장하는 소재가 되었다. 우리는 다양한 소프트웨어를 사용하여 준비한 수업에 학생들로 임하게는 하지만 거의 그들의 사고 발달과정에는 관심을 갖지 못하고 있다. 이 논문은 구성주의(Constructivism)와 정보처리체계(Information-Processing System)에 입각하여 수학의 시각화를 생각해보고 어떻게 시각화 환경을 준비해야하는지 논해보고자 하였다. 구성주의의 시각화에서는 반영적 추상(reflective abstraction), 반복되는 경험(repeated experience), 그리고 지식 위계성이 학습의 기능 체계를 이루므로 발견적 학습을 통해 학생 스스로 의미를 구성할 수 있도록 Thomas (1992)의 세 가지 제안을 이용하여 수업을 준비할 수 있다. 정보처리체계에서는 지식은 서술적인 것과 과정적인 것으로 나뉘어지고, 시각적 표상을 수록하고 삭제하는 과정과 조작 가능한(manipulative) 환경과의 상호작용으로 기호적 시각으로 표상을 변화하는 과정을 통해 개념을 습득하게된다. 시각화는 스키마와 개념상을 통해서 일어난다. 그래프, 애니메이션, 그리고 다른 시각적 표상 등은 이 개념상에 직접적 효과를 주므로 매우 중요하다. 이런 논란을 바탕으로 교사는 반영적 추상화를 위해 시간을 충분히 제공해야하고, 비슷한 문제를 가지고 여러번 시도를 할 수 있게 하며, 학생을 잘 관찰하여 그들의 지식 위계성을 이해하고 방향을 제시하며, 논리적이고 잘 연결된 시각적 표상을 제공하고, 상징적 사관으로 확장할 수 있게 조작할 수 있는 환경에서 시각화에 대해 학생과 많은 대화를 하도록 수업을 준비해야한다. 그한 예로 타원을 가르치기 위해 몇 가지 테크놀로지를 활용한 시각화 환경을 구성해보았다.ates of bisected bovine embryos by micromanipulator and micropipett were 29.2% and 19.1%, respectively. The rates of non-bisection embryos(46.7%) were significantly higher than those of bisection embryos. 2. The in vitro developmental rates of bisected bovine embryos by micromanipulator, micropipett and pipetting method were 32.4%, 19.4% and 25.6%, respectively.3. The in vitro developmental rates of with and without-zona pellucida of bisected bovine embryos by raicromanipulator were 30.8% and 25.0%, respectively. The rates of nonbisection embryos(53.1%) were significantly higher than those of bisection embryos.랑크톤 군집내 종 천이와 일차생산력에 크게 영향을 미칠 수 있음을 시사한다.TEX>5.2개)였으며, 등급별 회수율은 각각 GI(8.5%), GII(13.4%), GIII(43.9%), GIV(34.2%)로 나타났다.ments of that period left both in Japan and Korea. "Hyojedo" in Korea is supposed to have been influenced by the letter design. Asite- is also considered to

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20년 후 자화상 분석을 통한 과학 영재의 미래 직업에 대한 연구

  • 심규철;박상태;박종석;변두원;김여상
    • Proceedings of the Korean Society for the Gifted Conference
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    • 2003.05a
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    • pp.159-160
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    • 2003
  • 본 연구는 과학 영재들이 생각하는 "0년 후의 자화상"분석을 통해 그들이 바라는 미래 직업 또는 희망, 그 이유, 그리고 그에 대한 확신 등을 조사하고자 하였으며, K대학교 과학영재교육원 중등기초과정 수학, 물리, 화학, 생물, 지구, 정보 등 6개 분야 입학생 86명(남 56명, 여 30명)을 연구 대상으로 하였다. 분석 내용은 과학 영재들에게 20년 후의 자신의 모습을 자유 서술 방식으로 기술하도록 하였다. 과학 영재들이 자신의 미래의 꿈의 실현이나 직업에 대한 확신 또는 자신감을 갖고 있는 비율은 전체의 74% 수준이었으며, 남자 영재가 62%로 여자 영재의 88%보다 낮은 것으로 조사되었다(Pearson $X^2$=4.405, p<0.05). 또한, 과학 영재들의 미래의 희망 직업에 대한 조사에서는 자신이 속한 과학 영재분야와 관련된 직업은 29.2% 정도에 지나지 않았으며, 의사나 한의사 등 의학 계통에 종사하고자 하는 비율이 32.6%로 가장 많은 것으로 조사되었다. 이외에도 사업 경영, 교사, 법조인 및 정치인, 외교관 등 다양한 직업에 대한 희망을 갖고 있는 것으로 나타났다. 이러한 경향은 성별과 상관없이 동일한 것으로 조사되었다(Pearson $X^2$=9.570, p>0.05). 과학 영재들이 미래 직업으로 관련 과학분야에 대해 응답한 것을 수학, 물리, 화학, 생물, 지구, 정보 등 과학영재 분야별로 비교하여 보면, 수학 영재들이 54,5%로 가장 높았으며, 다음으로는 화학 분야 40% 정도를 차지하는 것으로 나타났다. 반면에, 과학 영재들이 가장 선호하였던 의학 분야에 대해서는 지구과학 영재들이 61.5%로 가장 높았으며 다음으로는 물리 영재들이 38. 9%를 차지한 것으로 조사되었다. 미래의 자신의 직업을 선택한 이유는 첫 번째가 사회 봉사와 국가 발전에 기여하기 위한 것이었으며, 다음으로는 생활의 안정을 꼽고 있었다. 이외에도 과학적 업적 달성을 위해, 자신의 꿈(이상) 실현을 위해 등의 이유를 들고 있었다. 이러한 경향은 남자 영재와 여자 영재들간에 다소 차이는 있었으나 거의 유사한 것으로 조사되었다(Pearson $X^2$=2.186, p>0.05). 우수한 능력을 소유한 영재들이 과학관련 분야를 선호하지 않는다면 우리나라의 과학 발전은 그리 낙관할 수 없을 것이다. 그러므로, 영재들을 과학 관련 분야로 이끌어 그들이 소유한 영재성을 발휘하도록 하는 것은 매우 중요한 일일 것이다. 이룰 위해서는 과학 영재들이 자신의 능력에 대한 자신감을 더욱 높여야 하며 그 능력을 과학관련 분야에 발휘하도록 하기 위한 국가적, 사회적, 교육적 노력이 필요하다. 노력이 필요하다.

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A Study of Factors Influencing the Intention of University Students to Accept Healthcare Information Technology Services (대학생의 건강정보기술서비스 수용의도에 미치는 영향요인)

  • Chung, Young-Soon;Han, Hyun-Mi
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.14 no.11
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    • pp.5698-5706
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    • 2013
  • This study presents research into the patterns that affect the understanding and acceptance of healthcare management systems as part of a healthcare information technology infrastructure targeted at university students. The participants were 623 university students in D city and K province. This study employed a descriptive and correlational cross-sectional survey and made use of the ubiquitous healthcare management services measurement scale. 48.5% of respondents had accessed healthcare-related information on the Internet. Among the independent variables of general characteristics related to perceived susceptibility was found to have adj $R^2$ of 11% while the other dependent factors reported much lower between 0.5 to 4.7%. Female respondents, medical-related majors, self-efficacy, and intention to use had significant positive effects while health beliefs and concern had a significant negative effect on the intentional acceptance of healthcare information technology systems.

Police Officers' Perception Concerning the Roles of Private Security (민간경비의 역할에 대한 경찰관의 인식연구)

  • Lee, Ju-Lak
    • Korean Security Journal
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    • no.18
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    • pp.101-118
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    • 2009
  • Despite large increases in the growth of the private security industry in the last few decades, very little empirically based information has been collected on the roles of private security within current Korean literature. Attempting to address this gap, this study examined perceptions of the roles of private security by surveying 212 police officers. In order to measure the strength of police officers' perception, not only quantitative but also qualitative methods were adopted. Overall, results of the study indicate that police officers considered private security as an adjunct to the police. However, they also believed that private security industry would grow to get square with the police in the near future. Concerning the specific roles of private security, police officers rated the roles of loss prevention and protection more highly than those of crime prevention and order maintenance. This result reveals that police officers thought private security had focused more on the roles related to the pursuit of profits than on the roles tied to its public functions.

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The Compressive Strength of Longitudinally Stiffened Plates Undergoing Local and Distortional Buckling (국부좌굴과 뒤틀림좌굴이 발생하는 종방향 보강재로 보강된 강판의 압축강도)

  • Park, Ho-Sang;Seo, Sang-Jung;Kwon, Young-Bong
    • Journal of Korean Society of Steel Construction
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    • v.22 no.3
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    • pp.219-228
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    • 2010
  • This paper describes an experimental research on the structural behavior and the ultimate strength of longitudinally stiffened plates subjected to local, distortional, or mixed-mode buckling under compression. The stiffened plate undergoes local, distortional, or interactive local-distortional buckling according to the flexural rigidity of the plate's longitudinal stiffeners and the width-thickness ratios of the sub-panels of the stiffened plate. A significant post-buckling strength in the local and distortional modes affects the ultimate strength of the longitudinally stiffened plate. Compression tests were conducted on stiffened plates that were fabricated from 4mm-thick SM400 steel plates with a nominal yield stress of 235MPa. A simple strength formula for the Direct Strength Method based on the test results was proposed. This paper proves that the Direct Strength Method can properly predict the ultimate strength of stiffened plates when the local buckling and distortional buckling occur simultaneously or nearly simultaneously.

Review of 2018 Major Medical Decisions (II) (2018년 주요 의료판결 분석 (II))

  • Lee, Dong Pil;Lee, Jung Sun;Yoo, Hyun Jung;Park, Tae Shin;Jeong, Hye Seung;Park, Noh Min
    • The Korean Society of Law and Medicine
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    • v.20 no.2
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    • pp.231-260
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    • 2019
  • Following the last issue, we summarized the major medical judgments in 2018. Especially, efforts have been made to introduce as many judgments as they relate to the obligation to explain. This is because the limits of the court's judgments were so diverse that it was unknown. Regarding the extent of damages, attention should also be paid to cases where the cost of care is recognized as a large amount, and cases where the memorandum is effective for the increased cost of treatment. The rulings related to the payment and deduction of medical expenses were the most discussed, although the description was small. The case of multi-institutional operation of medical institutions is an interim decision, but it is a case of interest in the medical community, and regarding uninsured medical expenses, cases of discretionary abuse have been reduced compared to the past, but are still significant.

Use of an Interposition Tube Graft for the Reattachment of Left Coronary Ostium to the Aortic Composite Valve Graft. -One Case- (Aortic Composite Valve Graft의 이식시 인조혈관을 이용한 좌 관상동맥의 문합술 1례 보고)

  • Kim, Chang-Nam;Choe, Jong-Beom;Choe, Hyeong-Ho
    • Journal of Chest Surgery
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    • v.29 no.6
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    • pp.646-650
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    • 1996
  • The usual methods for the re-attachment of coronary ostia to the ascending aortic conduit have several disadvantages and potential complications. A novel, straight forward technique is described that allows for tension free anastomoses to be co structed with minimal risk of blood loss and a reduced risk of reoperation for false aneurysms at the anastomoses. We performed this technique for the treatment of a 40-yrs-old male patient of acute aortic dissection (Stanford Type A, DeBakey Type I) with severe aortic re- gurgitation. The techinque comprised anastomosis of a beveled interposition tube graft to the left main coronary artery ostium, and its proximal anastomosis to the ascending aortic graft after seating the com- posite valve graft in the prepared aortic annulus. With this technique, the low-Iying or distant left main coronary ostium can be easily reattached to the ascending conduit without undue tension.

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A Study on Generation and Parsing System for MPEG-21 Broadcasting Digital Item (MPEG-21 방송 디지털 아이템을 위한 생성 및 파싱 시스템에 대한 연구)

  • 김천석;한희준;노용만;남제호;홍진우
    • Journal of Broadcast Engineering
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    • v.8 no.1
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    • pp.80-90
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    • 2003
  • Today, thanks to the spread of Internet and the development of various multimedia technologies, broadcasting environment is changing in a way to merging broadcasting and communication environment. In such a new environment, transparent delivery and interoperability between different technologies become an important issue. In ISO/IEC MPEG meeting, MPEG-21 has been established. In MPEG-21, it is discussed actively about big picture to build an infrastructure for the delivery and consumption of multimedia contents. In this paper, we have applied Digital Item in MPEG-21 to broadcasting contents. Broadcasting Digital Item is generated using MPEG-7 MDS for the description of resources as well as Digital Item Declaration, and Digital Item Identification. Furthermore, we develop Digital Item generation system and parsing system. In experiment, we verify the usefulness of Broadcasting Digital Item by generating an education video contents and consuming it at different user environments.