• 천문학회보
• /
• 제40권1호
• /
• pp.53.2-53.2
• /
• 2015

Fiber Bragg gratings (FBGs) are the most compact and reliable method of suppressing atmospheric emission lines in the infrared for ground-based telescopes. It has been proved that real FBGs based filters were able to eliminate 63 bright sky lines with minimal interline losses in 2011 (GNOSIS). Inscribing FBGs on multi-core fibers offers advantages. Compared to arrays of individual SMFs, the multi-core fiber Bragg grating (MCFBG) is greatly reduced in size, resistant to damage, simple to fabricate, and easy to taper into a photonics lantern (PRAXIS). Multi-mode fibers should be used and the number of modes has to be large enough to capture a sufficient amount of light from the telescope. However, the fiber Bragg gratings can only be inscribed in the single-mode fiber. A photonic lantern bi-directionally converts multi-mode to single-mode. The number of cores in MCFBGs corresponds to the mode. For a writing system consisting of a single ultra-violet (UV) laser and phase mask, the standard writing method is insufficient to produce uniform MCFBGs due to the spatial variations of the field at each core within the fiber. Most significant technical challenges are consequences of the side-on illumination of the fiber. Firstly, the fiber cladding acts as a cylindrical lens, narrowing the incident beam as it passes through the air-cladding interface. Consequently, cores receive reduced or zero illumination, while the focusing induces variations in the power at those that are exposed. The second effect is the shadowing of the furthest cores by the cores nearest to the light source. Due to a higher refractive index of cores than the cladding, diffraction occurs at each core-cladding interface as well as cores absorb the light. As a result, any core that is located directly behind another in the beam path is underexposed or exposed to a distorted interference pattern from what phase mask originally generates. Technologies are discussed to overcome the problems and recent experimental results are presented as well as simulation results.

• 한국전자통신학회논문지
• /
• 제12권1호
• /
• pp.75-84
• /
• 2017

초고속 환경에서 대용량 데이터에 대한 안정적 기록 및 효율적인 데이터 접근의 필요성은 갈수록 높아지고 있다. 이와 관련된 기초과학의 한 분야로 방대한 천체 관측 데이터를 생산하는 VLBI(: Very Long Baseline Interferometer)가 있는데 고분해능, 고감도 관측 연구를 수행하기 위해서는 고성능의 데이터 저장 시스템이 요구된다. 하지만 시장에 출시된 대다수 클라우드 기반 스토리지는 일반 IT, 금융, 행정 서비스 지원을 위한 저용량, 복수 스트림의 비정형 데이터에 최적화되어 있기 때문에 빅 스트림 데이터 기록을 위한 최적의 대안이 될 수 없다. 본 논문에서는 이를 극복하기 위한 방안으로 데이터 입출력 처리에 있어 고성능, 동시성에 최적화된 데이터 저장 시스템을 설계하고자 한다. 이를 위해 멀티 코어 CPU 환경에서 libpcap, pf_ring 등의 API 호출을 통해 패킷 입출력 모듈을 구현하였고 외부로부터 유입되는 데이터를 효율적으로 처리할 수 있도록 소프트웨어 RAID(: Redundant Array of Inexpensive Disks) 기반의 확장성 있는 스토리지를 구축하였다.

• 융합정보논문지
• /
• 제10권6호
• /
• pp.147-155
• /
• 2020

이 연구는 언어를 학습하는데 있어서의 학습자의 성격특성이 어떤 역할을 하여 어떤 관계를 가지고 있는지를 알아보는데 그 목적이 있다. 이를 위해서 기존의 연구를 분석하여 제시하였다. 즉, 최근의 연구들을 검토하기 위해서 언어학습과 성격특성에 관련된 연구들을 ProQuest, Google Scholar, 그리고 EBSCO 등의 데이터베이스를 통하여 추출하였다. 추출된 연구들을 검토하고 선정 및 정리하여 언어학습의 영역 즉 쓰기, 듣기, 말하기의 영역에서 성격특성이 어떤 역할을 하고 있는지를 문헌별로 정리하고 그 의미를 도출하였다. 문헌연구의 결과 외향성 및 개방성의 특성은 언어의 학습을 성공적으로 이끄는 데에 기여를 하고 있음을 확인하였다. 또한 외향성은 말하기에, 개방성은 듣기에 연관되어 있음을 연구들은 보고하고 있었다. 또한 학습자의 성격특성은 개인의 언어학습의 전략에도 관계되어 있고 전략수립에 영향을 미치고 있음이 확인되었다. 이같은 결과를 바탕으로 앞으로의 연구 방향에 대한 제언을 하였다.

• 한국자기학회지
• /
• 제16권3호
• /
• pp.186-191
• /
• 2006

자기터널접합 기반의 MRAM(magnetic random access memory)은 자기저항효과를 응용하는 메모리소자로서 비휘발성과 고속 정보처리가 가능할 뿐만 아니라 고집적화 할 수 있는 차세대 통합형 비휘발성 메모리이다. 그러나 기존의 메모리 소자들에 비해 스위칭 산포가 크고, 기록마진(writing margin)이 확보되지 않아 아직까지는 고집적화가 어려운 실정이다. 최근 포화자화가 낮은 NiFeSiB 및 CoFeSiB과 같은 비정질 강자성체를 자기터널접합의 자유층 재료로 사용하여 스위칭 자기장의 거대화를 크게 감소시켜 MRAM의 기록마진을 높이는 연구결과에 관해 정리하여 보았다. 그리고 이러한 물질을 이용하여 자기터널접합의 재생마진(reading margin)과 관련된 터널자기저항비의 인가전압의존성을 저감시킬 수 있었다. 본고에서는 나노자기소자 기술의 중요한 분야인 MRAM의 기술발전 방향과 연구사례를 소개하고자 한다.

• 융합보안논문지
• /
• 제17권2호
• /
• pp.165-171
• /
• 2017

이 연구의 목적은 부사관과 학생들의 의사소통 능력 향상을 위해 사고도구어를 선정하고 이를 활용한 글쓰기 교육방안을 고찰하는 것이다. 전문대학 부사관과에 적합한 사고도구어 선정은 다음과 같은 3단계를 거쳐 목록화 하였다. 첫째, 최근 3년간 부사관과 의사소통과 교육방안에 관련된 논문에서 사고도구어를 추출한다. 둘째, 기존 연구에서 고등학교 수준의 사고도구어와 비교한다. 셋째, 전문대학 부사관과 글쓰기 교육방안에서 활용 가능한 사고도구어를 선정한다. 이 연구에서 선정된 사고도구어는 전문대학 부사관과의 글쓰기 교육과 밀접하게 관련된 것으로 한정된 의미를 지니고 있다. 선정된 사고도구어는 협력학습 글쓰기 교육에 응용하여 학습자의 학술적 의사소통 능력을 향상시키는 방안을 모색하는데 활용하였다. 마지막으로 향후 연구를 위한 제언을 하였다.

• 비교문화연구
• /
• 제25권
• /
• pp.421-452
• /
• 2011

This writing is about an effort to try to preserve and transmit the materials related to Jing-Ju(京劇) who is the Chinese traditional theatrical art. The plan to preserve the materials of performing arts is very important because its collection and preservation about them are much more particular than other genres. China got the great results in this field because of China Jing-Ju Yinpeixiang (中國京劇音配像) project. Jing-Ju Yinpeixiang project is a kind of project to restore and preserve the materials which reproduced Jing-Ju repertoire by inserting the performance method of Yinpeixiang (音配像: put together images to sounds) by later actors and actresses of Jing-Ju in recordings of 1950s to 1960s by remained famous ones. Also, this is the large scale culture project that more than 170 institutions and more than 3000 persons participated in during the total 21 years that it first started in 1985 and was completed in the end of 2006. Thanks to this project, China got to have the almost perfect materials which reproduced live performances to add the images of junior actors and actresses who accurately imitated performances of 115 famous actors and actresses including each type of role, schools and great actors from 1907 to the end of 20th century in their voices. This is the only method to restore the materials in this world and very creative. It's been 15 years since TV broadcasting first showed its fruition to Chinese people. The Chinese government gave the positive judgement on this project and prepared to hold the big event which celebrated itself this year. But very little is known of this process and there is no any study in Korea. This writing tried to clarify what Jing-Ju Yinpeixiang project is, what it has meant to Chinese people and what results it has gotten after it's been 15 years since the first show was on TV.

• Archives of Plastic Surgery
• /
• 제49권4호
• /
• pp.538-542
• /
• 2022

Performing the first peer review of a plastic surgical research article can be an overwhelming task. However, it is an essential scholarly skill and peer review is used in a multitude of settings: evaluation of journal articles, conference abstracts, and research proposals. Furthermore, peer reviewing provides more than just the opportunity to read and help improve other's work: peer reviewing can improve your own scientific writing. A structured approach is possible and recommended. In these ten tips, we provide guidance on how to successfully conduct the first peer reviews. The ten tips on peer reviewing concern: 1) Appropriateness: are you qualified and prepared to perform the peer review? 2) Familiarization with the journal and its reviewing guidelines; 3) Gathering first impressions of the paper followed by specific tips for reviewing; 4) the abstract and introduction; 5) Materials, methods, and results (including statistical considerations); and 6) discussion, conclusion, and references. Tip 7 concerns writing and structuring the review; Tips 7 and 8 describe how to provide constructive criticism and understanding the limits of your expertise. Finally, Tip 10 details why-and how-you become a peer reviewer. Peer review can be done by any plastic surgeon, not just those interested in an academic career. These ten tips provide useful insights for both the aspiring and the experienced peer reviewer. In conclusion, a systematic approach to peer reviewing is possible and recommended, and can help you getting started to provide quality peer reviews that contribute to moving the field of plastic surgery forward.

• 대한안전경영과학회지
• /
• 제26권1호
• /
• pp.75-89
• /
• 2024

The objective of this study was to conduct research and analysis using Group Focus Interview to survey the between construction site workers and managers implementing for the Severe Accident Punishment Act. Focused on measures to improve safety management effectiveness for the effectiveness of establishing a safety management system. A plan to improve the efficient safety management system was presented to 50 construction industrial managers and workers. In order to ensure the industrial accident prevention policies appropriately, it is necessary to be aware of safety obligations for workers as well as business operators. In addition, despite the existence of a commentary on the Serious Accident Punishment Act, confusion in the field still persists, so in the event of a major accidents, the obligation to take safety and health education is strengthened, and effective case education is proposed by teaching actual accident cases suitable for actual working sites. It is necessary to make all training mandatory, and it is necessary to reconsider awareness through writing a daily safety log, awareness of risk factors, etc., and writing down risk information. Above all, at the construction ordering stage, it is necessary to keep the construction safety, request corrections and supplements for problems issues that arise, and consult between the orderer and the construction company about the problems issues. Rather than having only the construction company correct or supplement the safety management plan, the contents should be shared with supervisors and workers to establish a more practical solution. Results of this study will contribute to improving the effectiveness of the serious accident and construction safety management system.

• 한국보건간호학회지
• /
• 제19권1호
• /
• pp.74-94
• /
• 2005

The purpose of this study was to compare the effect of education between CAI(Computer Assisted Instruction) and lectures for smoking cessation among male students who attended vocational high schools. Conducted from February 24th to April 26th, 2003, the study design was quasi-experimental with nonequivalent control group pretest-posttest design. The study subjects were 60 male students in K vocational high school in Daegu city, who were present smokers and had more than 7.0 ppm concentration level of carbon monoxide. Thirty students were randomly chosen as the experimental group which applied CAI education method for smoking cessation. The other 30 students served as the control group which received lecture education method of 40 minutes on four consecutive days. CAI education for smoking cessation was composed of ready-made individual learning contents, counseling by using cyber-communication, writing a letter to stop smoking, and writing a written agreement for smoking cessation. Lecture education for smoking cessation was composed of a ready-prepared lecture for the group, writing a letter to stop smoking, and writing a written agreement for smoking cessation. To measure smoking related knowledge, Jeong Ree Roh(1996)'s smoking related knowledge scale$(Cronbach's\;{\alpha}=0.84)$ was modified and used by the researcher. To measure smoking related attitude, Jeong Ree Roh(1996)'s smoking related attitude scale$(Cronbach's\;{\alpha}=0.91)$ was modified and used by the researcher. Smoking related knowledge scale's Cronbach's $\alpha$ was 0.83 in the pilot study and 0.93 in this study. Smoking related attitude scale's Cronbach's a was 0.80 in the pilot study and 0.98 in this study. To determine the smoking amount, the number of cigarettes smoked per day was checked. The concentration level of CO in the exhaled breath was measured (Micro CO Cat. No. MCO2, UK). Data was analyzed by $x^2-test$, t-test, repeated measures ANOVA. simple main effects, and time contrast test with SPSS/Win 11.0 program. The results of this study were as follows: 1. The first hypothesis. that 'Smoking-related knowledge score in the experimental group by using CAI education for smoking cessation will be higher than that in the control group by using lecture education for smoking cessation', was not supported. 2. The second hypothesis, that 'Smoking-related attitude in the experimental group by using CAI education for smoking cessation will be higher than that in the control group by using lecture education for smoking cessation'. was supported(F=6490.79. p=0.000). 3. The third hypothesis. that 'Smoking amount in the experimental group by using CAI education for smoking cessation will be less than that in the control group by using lecture education for smoking cessation'. was supported. 1) The third-1st sub-hypothesis. that 'The number of cigarettes smoked per day in the experimental group by using CAI education for smoking cessation will be less than that in the control group by using lecture education for smoking cessation'. was supported(F=134.19. p=0.000). 2) The third-2nd sub-hypothesis. that 'The concentration level of CO by ppm per one exhaled breath in the experimental group by using CAI education for smoking cessation will be lower than that in the control group by using lecture education for smoking cessation"' was supported(F=268.55. p=0.000). From the above results. CAI education can be an effective intervention to improve smoking-related knowledge and attitude. and to reduce the number of cigarettes smoked per day and the concentration level of CO by ppm per one exhaled breath. Lecture education can be effective to improve smoking-related knowledge. In the future, when CAI education and lecture education for smoking cessation are applied on the school nursing field. the students can gain a comprehensive understanding of smoking cessation, changes in smoking-related knowledge. smoking-related attitude and reducing smoking amount. Furthermore, CAI education for smoking cessation could be developed as an individual self initiative program and could give a guideline to apply CAI education for smoking cessation in other field.

• 수완나부미
• /
• 제10권1호
• /
• pp.63-91
• /
• 2018

One of the goals of this article is to continue the momentum begun by emerging scholarship on theory and practice of writing about visual culture of and in Southeast Asia. I hope to offer culturally sensitive and embodied ways of looking at images and objects as sites/sights of cultural knowledge as further theoretical intervention. The argument put forward in my essay is three-fold: first, I critique the prevailing logocentric approach in the field of Southeast Asian Studies and I argue that in a postcolonial, global, and transnational period, it is important to be inclusive of other objects as sites/sights of social, political and cultural analysis beyond written and oral texts. Second, I argue that although it has its own political and theoretical problems, the evolving field of Visual Studies as it is practiced in the United States is one of many ways to decolonize the prevailing logocentric approach to Southeast Asian Studies. Third, I argue that if one reads these Euro-American derived theories of vision and visuality through the lens of what Walter Mignolo calls "colonial difference(s)," then Visual Studies as an evolving field has the potential to offer more nuanced local ways of looking at and understanding objects, vision, and visuality. Last, I point out that unlike in the West where there is an understanding of pure, objective and empirical vision, local Southeast Asian perspectives on objects and visions are more embodied and multi-sensorial. I argue that if one is ethically mindful of the local cultural ways of seeing and knowing objects, then the evolving field of Visual Studies offers a much-needed intervention to the privileged, lingering logocentric approach to Southeast Asian Studies. Moreover, these alternative methods might help to decolonize method and theory in academic disciplines that were invented during the colonial period.