OCT에 의한 다층 박막의 Spot Marking 분석

신용진(Yongjin Shin),김현진(Hyunjin Kim),김영섭(Youngseop Kim),박소희(Sohee Park) 한국레이저가공학회 2004 한국레이저가공학회지 Vol.7 No.2

  We propose a novel application of optical coherence tomography (OCT) to monitor pit formation in laser irradiated optical storage materials. A multilayer optical storage recordable compact disk, is composed of multiple layers, each of different structure. Disks were irradiated with aQ-Switched Nd:YAG laser with an energy of 373 mJ. Post-irradiated disks were evaluated by OCT and those images were compared with optical microscopy. Our results indicate that OCT is a useful instrument to investigate pit formation in multilayer optical storage disks and might also provide information to optimize optical memory technology.

클라우드 컴퓨팅 기반의 U-City 서비스 프로비저닝

신용진(Yongjin Shin),김학배(Hagbae Kim),이성표(Sungpyo Lee),남의석(Euiseok Nahm),이영훈(Younghun Lee) 한국정보기술학회 2009 한국정보기술학회논문지 Vol.7 No.3

Information Technology, which is already the key factor in various parts of our society, is changing the way of our urban life in the form of U-City (Ubiquitous-City). U-City provides its residents with many new services in the large, complex area by gathering and integrating data from the various sources. However, since data are influenced by time, context and other related factors, it is very difficult either to predict the size of data, or to process data. Thus reliable and flexible IT resources are necessary in U-City service models. In this paper, we propose “the Cloud Computing based U-City Service Architecture” which helps us to get and expand IT resources easily, whenever and wherever to meet the business requirements. We also analyze the current U-City architectures and the virtual technologies. The new architecture is aiming the vision of “Low Carbon, Green Growth” by sharing of computing resources and saving energy.

Virtual-Constructive 시뮬레이션 연동을 활용한 공중전 전투 실험

김동준(Dongjun Kim),신용진(Yongjin Shin),안경수(Kyeong-Soo An),김영곤(Young-Gon Kim),문일철(Il-Chul Moon),배장원(Jang Won Bae) 한국시뮬레이션학회 2021 한국시뮬레이션학회 논문지 Vol.30 No.1

시뮬레이션을 통하여 경험하기 어려운 사건을 가상적으로 체험할 수도 있으며, 분석을 수행할 수도 있다. 국방시뮬레이션 분야에서 이런 체험을 기반으로 Virtual 시뮬레이션이 연구 개발되고 있으며, 분석을 위하여 Constructive 시뮬레이션이 연구 개발되고 있다. 이런 시뮬레이션을 연동하여, VC(Virtual-Constructive) 시뮬레이션 환경을 구성할 수 있고, VC 시뮬레이션 환경은 전투 환경의 가상적인 경험과 교전개체의 지능적인 전술을 동시에 시험할 수 있는 환경이다. 또한, 최근의 인공지능 연구를 위해, 사람의 행동을 학습하는 이미테이션 학습 혹은 역강화학습 분야는 VC 환경에서 수집된 인간 행동 데이터를 필요로 한다. 제시된 연구는 공중전 분야에 VC 시뮬레이션 환경의 사례를 보여주며, 이를 통해 수집된 인간 행동 데이터의 특징을 분석하고 있다. 본 논문을 통하여, 공중전 분야 VC 시뮬레이션 환경이 어떻게 구축될 수 있으며, 인공지능 학습을 위하여 어떻게 활용될 수 있는지 보여준다. Simulations enable virtually experiencing rare events as well as analytically analyzing such events. Defense modeling and simulation research and develops the virtual and the constructive simulations to support these utilizations. These virtual and constructive(VC) simulations can interoperate to simultaneously virtual combat experience as well as evaluations on tactics and intelligence of combat entities. Moreover, recently, for artificial intelligence researches, it is necessary to retrieve human behavior data to proceed the imitation learning and the inverse reinforcement learning. The presented work illustrates a case study of VC interoperations in the aircombat scenario, and the work analyze the collected human behavior data from the VC interoperations. Through this case study, we discuss how to build the VC simulation in the aircombat area and how to utilize the collected human behavior data.

딥러닝 기반 특허 도면 검색 연구

한재석(Han Jaeseok),이윤신(Lee Yunshin),김홍기(Kim Hongki),신용진(Shin Yongjin) 한국정보과학회 2023 한국정보과학회 학술발표논문집 Vol.2023 No.6

분류기 불일치 기반 비감독 도메인 적응 기법을 통한 회전체 고장 진단 기술

이진욱(Jinwook Lee),김명연(Myungyon Kim),고진욱(Jin Uk Ko),신용진(Yongjin Shin),윤병동(Byeng D. Youn) 대한기계학회 2020 대한기계학회 춘추학술대회 Vol.2020 No.12

Recently, deep learning-based fault diagnosis has been studied in many fields because of its superiority compared to existing data-driven method. However, it requires assumption that training and test data are drawn from same distribution which is generally not satisfied in real industry field. In order to address this problem, called domain shift, alleviating discrepancy between marginal distributions is widely utilized in existing methods. While performance is enhanced, there is limitation that these methods cannot consider the relation between target samples and decision boundaries. This can cause performance degradation compared to not using domain adaptation, called negative transfer. To solve this problem, we propose to maximize the discrepancy between two classifiers’ probability outputs to detect target samples that are far from the source samples. A feature extractor learns to generate target features near the source samples to minimize the discrepancy. Two bearing datasets are utilized to validate the effectiveness of proposed method. The results show that proposed method outperforms existing marginal distribution matching method.

幼兒前期의 韓國語 習得에 關한 硏究

申鎔鎭 서울大學校 語學硏究所 1975 應用 言語學 Vol.7 No.1

The present paper purposes to research the process of language acquisition of the part of a two-year-old child who is normally grown. Main concerns in the treatment of this was to see 1) whether or not a child learns language by imitation and 2) how the construction of the language is established at the beginning stage of the child. Behaviorists draw in learning by imitation when they explain how a child acquires a language whereas cognists do not. Chomsky(1964) said that 'learning by imitation' could was that 'learning by imitation' could not be true not only on the level of sentence formation, but also on the level of the words, at least on the language use of a two-year-old child. Telegraphic sentences which a child uses consist of 'topic+modifier' mainly, and sometimes it was observed that such patterns as 'topic' and 'modifier+topic' were used. He has a definite concept of tenses, that is, he uses present, past, and future tense rather freely. But he has low frequency in the use of future tense. In the formation of negation he puts 'A' and 'AN' before the verb, in particular, 'AN' before the transitive verb, and 'A' before the intransitive and transitive verbs. And also 'A' and 'AN' equivalents of English 'NO' are used differently. As a result he seems to acquire a language by self-correction through cognitive development on the basis of mature experience, and so forth rather than by imitation, and he also seems to have an egocentric component of language as Piaget said. Finally it should be pointed out that child's language has been developed on the three stages; hierarchy, regularization, and transformations.

영어 교과서 개발을 위한 방법론적 제언

신용진 全北大學校 敎育大學院 1992 敎育論叢 Vol.12 No.-

This thesis is to suggest a number of ways to develop the effective, scientific and reasonable English textbooks for middle and high school students. In the past most of English textbooks have been developed and used in the middle and high schools. Here the most important thing is that they were written in terms of grammatical syllabus, not notional and functional syllabus. In this thesis notional and functional syllabus was focused on strongly. And the qualification of writing and screening English textbooks and the contents of student-centered instruction, not teacher-centered instruction were emphasized on.

레이저 가공된 내부 및 표면패턴을 가지는 도광판 성능 분석

최영희,신용진,최은서 한국레이저가공학회 2008 한국레이저가공학회지 Vol.11 No.1

We proposed new light guide panel (LGP) fabrication method exploiting laser-processed inner scatterers and surface pattern. The proposed method has achieved LGP performance improvement in both brightness and uniformity. The inner scatterers and surface pattern of grid type were fabricated with a 2nd harmonic Nd:YAG pulse laser engraving system and a CO_(2) laser scanning system, respectively. In the implementation of LGP, inner scatterers was arranged in accordance with linear or curved pattern with changing density and surface pattern was engraved on the surface of an inner-scatterers embedded LGP. The increase of scatterers' density and the use of surface patterns in both linear and curved pattern provided high luminance and uniformity enhancement. While thecurved pattern incorporated with increased scatterers' density and surface patterns yielded brightness improvement with preserving good uniformity, the linear pattern showed highly localized brightness near the light entrance of the LGP. We can also observe that the uniformity was mainly determined by pattern of inner scatterers, and the brightness was improved by the higher density and the utilization of surface patterns. From the results, the use of laser-processed inner and surface patterns can be a potential alternative for efficient and simple LGP fabrication method.

CO₂레이저빔 조사량에 따른 플라스틱 Dent 형성에 관한 연구

조새련,김영섭,양경승,박영신,신용진,이상열,박영식 조선대학교 기초과학연구소 2001 自然科學硏究 Vol.24 No.-

We studied the interactions of Gaussian CO₂ laser beam with two kinds of plastics. polymethyl methacrylate(Acryl) and acrylonitrile-butadiene-styrene(ABS) by examining the profiles of the holes which were perforated by focused irradiations on samples A rim around hole was observed on the ABS sample while only a melt zone was observed on the Acrylic sample. This difference may be explained in terms of the most dominant drilling process among three different mechanisms; melt ejection, vaporization, and chemical degradation. The hole profiles on the ABS and acrylic sample are fitted well to a Gaussian and complementary error function respectively. The volumes of the holes drilled by laser beams are proportional to the total irradiated energy on the samples, which may indicate that only the fixes portion of absorbed laser power is used to form the holes through ranges of irradiated beam energy, the diameters of holes on both samples are gradually approaching differently, to a certain value with increasing irradiated beam energy. On the ABS sample, the width of the rim exhibits a variation with irradiated energy in the same way as the diameter of the hole does and the height of the rim is increasing linearly with increasing beam energy. The width of the melt zone on Acrylic sample is also approaching to a certain value gradually with irradiated energy.

FT NMR의 고 분해능에 관한 연구

박소희,양경승,김영섭,신용진,장차익 조선대학교 기초과학연구소 2001 自然科學硏究 Vol.24 No.-

FT NMR Spectroscopy is the method of obtaining the spectrum by Fourier transform(FT) of a time varying signal called the free induction decay(FID) signal Usually, Resolution of spectrum are decided by Fourier transform. It's hard to distinguish those nuclei with close frequency at low external magnetic field. So we are going to use simulation which is corresponding to a lot of the variable parameters In this study frequencies were provided to the four nuclei with high natural abundance and the high NMR frequency, and the intensities corresponding to the frequencies were applies. We verified that the unidentical intensity was provided and the signal has been amassed for two nuclei. Also We scrutinized that the nuclei of the analogous frequencies have constituted resolution of two peaks as shown in Fourier transform. Resolution with FT is determined by FID data points when the range of measurement in NMR is given and then we made a vigorous examination method for high resolution through simulation for two real nuclei of close. From this research, we can understand NMR and apply experimental method. Therefore, these high resolution method was willing to applied many experimental NMR.