• 대한치과의사협회지
• /
• 제48권5호
• /
• pp.342-348
• /
• 2010

Korean dental association (KDA) intensively drives no smoking activities for a healthy life of Korean people. In this article, hazardous facts of smoking in oral system are reviewed from the point of view of dental science. Various activities against smoking including campaigns, conferences, polls, exhibitions and publications driven by KDA are introduced.

• 진공이야기
• /
• 제1권1호
• /
• pp.17-20
• /
• 2014

This article introduces the basic concepts of various soft X-ray spectroscopies in the study of surface and interface electronic structures. Especially, recent results of X-ray photoelectron spectroscopy experiments on organic/inorganic thin films and a lead-free solder alloys will be discussed. Soft X-ray spectroscopies to understand the chemical and electrical properties would be of broad interest in the vacuum science communities.

• 한국과학교육학회지
• /
• 제31권2호
• /
• pp.256-270
• /
• 2011

이 연구는 중학생들을 대상으로 비교과 동아리 활동인 과학 잡지 제작 활동을 통해 다양한 학습자의 참여 형태가 어떻게 변화하며 이에 영향을 미치는 요인은 무엇인지 알아보는 것을 목적으로 한다. 문화기술연구 방법을 활용하여 14개월 동안 수행되었으며, 연구 참여자는 과학 잡지 편집부에 자원한 중학생 24명과 연구자인 지도교사로, 학생들은 학교 주변의 동식물 관찰, 궁금했던 과학현상 탐구, 과학자 만나보기 등을 기반으로, 편집부 웹 사이트 운영 및 과학 잡지 기사쓰기 활동을 수행하였다.연구 결과 학습자의 참여는 과학 잡지 편집부라는 실행 공동체에 대한 참여의 정도에 따라 주변적 참여,이행기의 참여, 완전한 참여라고 하는 3단계를 거쳐 발달하는 것으로 나타났으며, 완전한 참여로 발달해감에 따라 과학 잡지 제작 활동에 대한 개인적 흥미발생, 가치 부여와 함께, 메타 인지적 글쓰기와 자발적 학습 증진, 과학 잡지 기자로서의 정체성 형성 등을 보였다. 학습자의 참여 발달에 영향을 미친 요인으로는 학습 환경 요인으로 제공된 과학 잡지 글쓰기의 속성, 교사 요인으로 제공된 스캐폴딩, 그리고 가장 중요한 학습자 요인으로 탐구와 글쓰기를 즐기고 가치를 부여하는 과정 등이 있음을 알 수 있었다. 또한 다양한 흥미, 호기심을 가진 학생들이 과학 잡지 글쓰기를 통해 과학에 대한 긍정적 태도를 형성하고, 반성적, 메타 인지적 사고를 경험하며 자발적 학습으로 이행하게 된다는 연구 결과를 얻을 수 있었다. 이와 같은 본 연구의 결과는 학습자의 과학적 소양을 함양시키는 것과 함께, 평생 학습 사회를 살게 될 학습자들을 위한 자발적 공동체 구성, 참여, 실행의 경험을 제공함으로써, 보다 학습자 정체성에 입각한 진정한 학습의 가능성을 제시하였다는 점에서 그 의의를 찾을 수 있다.

• FOCUS: LIFE SCIENCE
• /
• 제1호
• /
• pp.3.1-3.7
• /
• 2024

The article discusses the critical role of chromatography in the analysis and purification of proteins in biopharmaceuticals, emphasizing the importance of comprehensive characterization for ensuring their safety and efficacy. It highlights the use of Avantor® ACE® HPLC columns for the separation and purification of proteins, focusing on the analysis of intact proteins using reversed-phase liquid chromatography (RPLC) with fully porous particles. This article also details the application of different mobile phase additives, such as TFA and formic acid, and emphasizes the advantages of using type B ultra-pure silica-based columns for efficiency and peak shape in biomolecule analysis. Additionally, it addresses the challenges of analyzing intact proteins due to slow molecular diffusion and introduces the concept of solid-core (or superficially porous) particles, emphasizing their benefits over traditional porous particles for the analysis of therapeutic proteins. Furthermore, it discusses the development of Avantor® ACE® UltraCore BIO columns, specifically designed for the high-efficiency separation of large biomolecules, such as proteins, and demonstrates their effectiveness in achieving high-resolution separations, even for higher molecular weight proteins like monoclonal antibodies (mAbs). In addition, it underscores the complexity of analyzing and characterizing intact protein biopharmaceuticals, requiring a range of analytical techniques and the use of wide-pore stationary phases, operated at elevated temperatures and with relatively shallow gradients. It highlights the comprehensive range of options offered by Avantor® ACE® wide pore columns, including both fully porous and solid-core particles, bonded with a variety of complementary stationary phase chemistries to optimize selectivity during method development. The use of ultrapure and highly inert base silica is emphasized for enabling the use of lower concentrations of mobile phase modifiers without compromising analyte peak shape, particularly beneficial for LC-MS applications. Then the article concludes by emphasizing the significance of reversed-phase liquid chromatography and its compatibility with mass spectrometry as a valuable tool for the separation and analysis of intact proteins and their closely related variants in biopharmaceuticals.

• 전자통신동향분석
• /
• 제33권1호
• /
• pp.1-10
• /
• 2018

Artificial intelligence, which is based on deep learning, is emerging as a fundamental technology that will bring about future social changes. Artificial intelligence technology in IT is an essential intelligent system, and will overcome the performance limit of computing systems, and is expected to be the foundation for the development of computing environment destructively. The development of artificial intelligence technology in developed countries is a direction toward convergence with brain science. In this article, we will look at the prospect of artificial intelligence as the manifestation of imagination, as well as the technology and policy trends of artificial intelligence both at home and abroad, and discuss the direction of future technology development in terms of fusion with brain science.

• 대한치과의사협회지
• /
• 제54권7호
• /
• pp.513-520
• /
• 2016

In crossed occlusion, displacement of removable partial denture is likely to occur during function due to different characteristics of abutment and supporting tissue. It increases discomfort to the patient. In addition, adverse effect on the residual ridge and abutment can induce an unfavorable prognosis of the denture. In this case, a small number of implants can be placed in strategic locations. Attachment can be added for additional support and retention of removable partial denture assisted by implants. This article describes the rehabilitation of a crossed occlusion patient using implant-assisted removable partial denture with Locator$^{(R)}$ attachment. After 24 months, the patient was satisfied with the aesthetic and function of the prosthesis that is maintained stable.

• 한국수학사학회지
• /
• 제23권2호
• /
• pp.1-21
• /
• 2010

광무 9년(1905년) 12월5일 한국인 최초의 이학사인 유일선이 발행한 우리나라 첫 번째 수학 저널인 <수리학잡지 (數理學雜誌)> 가 사료로 최근 수학계에 그 존재를 알렸다. 이 저널은 매월 5일 발행한 정기간행물로 2년 정도 (광무10년 6월5일 제 7호까지) 발간된 후 폐간되었다. 발행은 유일선에 의해 1907년 설립된 정리사(精理舍) 가 위치한 서울 남대문 근처 상동 (尙洞) 의 '수리학잡지사' 를 통하여 이루어졌다. 그 내용은 근대수학의 기초 내용을 강론형식으로 서술한 '산술신강의' 와 '산술문제 해설' 및 '이과 (理科)' 로 구성되었다. 본 논문은 유일선이 발행한 한국 최초의 수학 저널 <수리학잡지> 의 창간호의 내용을 분석하고 그 내용을 구체적으로 소개하는데 그 목적이 있다.

• 대한치과의사협회지
• /
• 제51권6호
• /
• pp.337-345
• /
• 2013

Currently CAD/CAM technology has been used widely in dentistry. But it has mainly been focused on fabrication of fixed partial dentures and implant-supported prosthesis. DENTCA company uses new cutting edge of CAD/CAM technology to revolutionize denture production. With developing a CAD/CAM technology of DENTCA company, it is possible to make complete dentures with minimum visits to the clinic. The aim of this article is to introduce a new denture-making method by CAD/CAM.

• 대한치과의사협회지
• /
• 제48권12호
• /
• pp.868-879
• /
• 2010

Adjunctive orthodontic therapy may be required to create appropriate space, to address misalignment and tooth size discrepancy for better function and esthetics. The desired interproximal alveolar contour and gingival embrasure form can be developed during treatment. Various applications of temporary anchorage devices for pre-prosthetic tooth movement allowed clinicians to achieve high efficiency, shorter treatment time, and less discomfort of patient. Biomechanical considerations for the periodontal status of the affected teeth are required to successfully control the vertical and horizontal space. Hence, the interdisciplinary approaches have an essential role in maximizing the favorable treatment outcome. In particular, pivotal Clinical decisions such as whether to open or close the space should be made by consensus of the involved dentists. This article presents the orthodontic treatment approaches for prosthodontic works including mesiodistal and vertical space regaining specially for cases of unrestored teeth over an extended period of time.

• 진공이야기
• /
• 제2권4호
• /
• pp.16-26
• /
• 2015

Carbon nanomaterials including nanocrystalline diamond and graphene films are expected to play a core role in $21^{st}$ century industries due to their amazing physicochemical properties. To achieve their practical utilization and industrialization, the development of their mass production technologies is strongly required. Recently, a surface wave excited plasma (SWP) which is produced using microwaves has been attracting special attentions as a candidate for the mass production technology of carbon nanomaterials. SWP can allow a low-temperature large-area plasma chemical vapor deposition (CVD) system. Here, this article introduces the promising SWP-CVD technology. Plasma characteristics in a SWP will be introduced in detail to help understanding how to use and control a SWP as a plasma source for CVD applications.