• Computers and Concrete
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• 제18권3호
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• pp.405-420
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• 2016

Recently laser scanning technologies become widely used in many areas of the modern economy. In the following paper authors show a potential spectrum of use Terrestrial Laser Scanning (TLS) in diagnostics of reinforced concrete elements. Based on modes of failure analysis of reinforcement concrete beam authors describe downsides and advantages of adaptation of terrestrial laser scanning to this purpose, moreover reveal under which condition this technology might be used. Research studies were conducted by Faculty of Civil and Environmental Engineering at Gdansk University of Technology. An experiment involved bending of reinforced concrete beam, the process was registered by the terrestrial laser scanner. Reinforced concrete beam was deliberately overloaded and eventually failed by shear. Whole failure process was tracing and recording by scanner Leica ScanStation C10 and verified by synchronous photographic registration supported by digital photogrammetry methods. Obtained data were post-processed in Leica Cyclone (dedicated software) and MeshLab (program on GPL license). The main goal of this paper is to prove the effectiveness of TLS in diagnostics of reinforced concrete elements. Authors propose few methods and procedures to virtually reconstruct failure process, measure geometry and assess a condition of structure.

• 음성과학
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• 제10권2호
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• pp.145-157
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• 2003

Vowels are classified by the shapes of vocal tract. These shapes form constriction points along the tract, which have an influence on such vocal tract resonance as F1, F2, F3, and so on. The formant frequency is influenced by aperture and placement of tongue and the intensity is influenced by air pressure of subglottis. The object of this study compares to characterize the spectral outputs of oral and nasal spectra for the formant frequencies and intensity of Korean oral vowels. Subjects consisted of 20 normal persons (10 male and 10 female) without laryngeal pathology. The speech sample included /a/, /e/, /i/, /o/, /u/ of Korean oral vowels. The spectrum of each vowel was analysed by Nasal View and Real Analysis Program using Dr. Speech. The result showed that nasal intensity is decreased manifestly from F1 to F2. But oral intensity and Intensity is decreased little bit from F1 to F2. The most of values of nasal formant frequency is similarity oral formant frequency and Formant frequency or little bit smaller.

• 천문학회보
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• 제43권1호
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• pp.32.4-33
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• 2018

We study the kinematical properties of the Seyfert galaxy, NGC 4051 and Mrk 79. The data used in this study had been observed with OASIS spectrometer at CFHT 3.6m telescope using O300 grism, MR1. The wavelength coverage is $4760{\AA}$ $-5558{\AA}$, which includes emission lines, $H{\beta}4861{\AA}$, $[OIII]4959{\AA}$, and $[OIII]5007{\AA}$. We observe that forbidden lines have both narrow and broad components. Radial velocity of NGC 4051 is blue-shifted, perhaps due to the z value derived by the earlier studies, 0.002336. We use the revised z, 0.002099, according to the radial velocity of the central spectrum. NGC 4051 is face-on galaxy without rotation observed. Radial velocity of Mrk 79 shows a rotation characteristic in narrow components, relative to $PA=60^{\circ}$, red-shifted to north-west, and blue-shifted to south-east. In the [OIII] broad components, blue-shifted points are observed at the place at 2 arcsec apart from the center of Mrk 79 to north-west, which are likely to be gas outflow.

• 한국정보과학회:학술대회논문집
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• 한국정보과학회 2012년도 한국컴퓨터종합학술대회논문집 Vol.39 No.1(B)
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• pp.414-416
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• 2012

고차 주성분 방법으로는 텐서 분석이 있었다. Electroencephalography(EEG) 데이터나 Social Network 데이터에 텐서 분석이 적용되어 주요한 성분들을 찾는 연구들이 있었다. 그러나 텐서 분석은 직관적으로 이해하기에 어려움이 있으며 중요한 노드를 찾는데에는 다소 어려움이 있다. 본 논문에서는 고차 하이퍼에지로 이차원 행렬을 만들고 주성분분석법을 이용하여 중요한 노드를 찾는 새로운 방법론을 제시한다. 데이터로는 Multimodal Memory Game(MMG) 수행시 촬영한 EEG 데이터를 사용하였다. MMG는 TV 드라마 기반의 기억인출게임이다. 베타파의 Power Spectrum Density(PSD)는 각 위치의 채널들의 활성도를 나타내는 지표이다. 우리는 Random Sampling을 바탕으로 PSD 상위 50%의 채널들간의 전이행렬을 구하였다. 그 후 고유치와 고유벡터를 구하였다. 가장 큰 고유치의 고유벡터는 주성분을 나타내며 고유벡터의 각 원소들은 중요도를 나타내는 centrality 이다. 세 명의 피험자에 대한 centrality 상위 30개의 중요한 채널들을 구하였고 세명에 공통적으로 포함되는 채널을 확인하였다.

• 조명전기설비학회논문지
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• 제15권4호
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• pp.1-6
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• 2001

본 논문에서는 태양광 채광시스템의 출력광의 스펙트럼을 분석하였으며, 그 결과 태양광이 갖는 자외선 분포 보다 낮음을 알 수 있었다. 또한, 출력단의 조명환경을 조명설계 프로그램을 이용하여 6$\times$6$\times$2.3[m]인 최소작업 공간의 조명 환경을 예측하였으며, 광파이버 조명시스템의 출력단의 높이를 1.3[m]에 위치하였을 경우 50$\times$50[cm]의 면적에서 500[lx] 이상의 조도값을 얻을 수 있었다. 이와 같이, 시스템의 가격문제를 개선한다면 실내 조명광 원으로서 가능하리라 본다.

• 조명전기설비학회논문지
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• 제29권12호
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• pp.1-7
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• 2015

In this paper, we propose a second-order fiber flexible comb filter based on a polarization-diversity loop(PDL). The proposed filter consists of a polarization beam splitter, four half-wave plates(HWPs), and three high birefringence fiber(HBF) segments. In the previous Solc-type second-order filter based on the PDL, HBF segments were fusion-spliced with a fixed angle offset between their principal axes with each other. But, the proposed filter implemented by inserting two HWPs between three HBF segments has a great flexibility in adjusting relative angular difference between the principal axes of two adjacent HBF segments. Owing to this flexibility, second-order transmission spectra, which had a channel spacing of ~0.8nm, could be interleaved by controlling the orientation angles of four HWPs. The output transmission spectra of the proposed filter were theoretically analyzed and experimentally verified.

• 한국전기전자재료학회논문지
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• 제17권2호
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• pp.236-241
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• 2004

New electrolytes of cubic L $a_2$M $o_2$-x Nbx $O_{9-}$$\delta$/(x=0, 0.05, 0.1, 0.2) were fabricated by a solid-state reaction method and their sintered densities were approximately 93％ of theoretical density. X-ray diffraction analysis and microstructure observation for the sintered specimens were performed. The at complex impedance were measured at 34$0^{\circ}C$ to 93$0^{\circ}C$ in air and fitted with a Solatron ZView program. Their impedance spectra showed big difference below and over the phase transition temperature (58$0^{\circ}C$). The electrical conductivity of L $a_2$M $o_2$ $O_{9}$ was 1.36${\times}$10$^{-2}$ S$cm^{-1}$ / at 817$^{\circ}C$. Comparing to undoped L $a_2$M $o_2$ $O_{9}$ , Nb-doped specimen showed the increase of electrical conductivity due to the aliovalent doping effect..

• 대한방사선기술학회지:방사선기술과학
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• 제46권1호
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• pp.37-42
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• 2023

Most of research on environmental radioactivity is conducted in areas near nuclear power plants, so basic data about the distribution of environmental radioactivity in soil in other areas are insufficient. Therefore, in this study, divide into four categories by the land development characteristics of Incheon and the purpose of development, and confirm the stability of the Incheon through soil sample collection and gamma-ray analysis based on ⁴⁰K, ¹³⁷Cs and ²²⁶Ra (²¹⁴Pb, ²¹⁴Bi). The spectrum obtained by measuring for 80,000 seconds by using the HPGe detector was analyzed by Genie 2000 program. Soil radioactivity concentrations in urban parks of Incheon area are generally within a safe range compared to the results of the Nuclear safety and security commission. However, as ¹³⁷Cs was detected in one park, which will require continuous monitoring.

• 한국전산구조공학회논문집
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• 제22권1호
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• pp.105-115
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• 2009

휨거동을 하는 전단벽을 대상으로 동일한 총 단면적을 갖는 1개의 전단벽과 마찰형 감쇠기로 연결된 전단벽의 내진성능을 수치해석을 통해 비교하였다. KBC 2005 설계스펙트럼을 근거로 축소 조절한 7개의 지진파를 입력하중으로 마찰형 감쇠기가 설치된 전단벽의 평균응답을 분석하였다. 마찰형 감쇠기의 중요한 설계변수인 기준 마찰력인 슬립하중은 각층의 마찰형 감쇠기 위치에 생기는 수직방향 전단력의 총합의 5, 10, 20, 30, 60, 90%값으로 하여 슬립이 특정한 층에 편중되지 않도록 하였다. SeismoSturct 프로그램을 이용해 비선형시간이력 해석을 수행하여 밑면 전단력, 에너지 소산량, 1층 벽체곡률, 최상층변위 측면에서 마찰 감쇠기의 제진성능을 분석하였다. 기준마찰력의 30%이하 수준의 총 마찰력을 갖는 마찰 감쇠기가 우수한 제진성능을 보였다.

• 한국지반공학회논문집
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• 제36권11호
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• pp.21-33
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• 2020

본 연구에서는 국내 내진설계기준 공통적용사항(MOIS, 2017)의 지반증폭계수를 활용하여 지표면 최대가속도를 산출하는 방법의 적절성을 검토하기 위해 포항지역 전역의 시추공을 대상으로 1차원 등가선형해석프로그램을 통해 지반응답해석을 수행하였다. 지반응답해석을 위한 지진파는 내진설계기준 공통적용사항에 따라 지진 재현주기 500년, 1000년, 2400년의 표준설계응답스펙트럼에 맞추었고, 지반데이터는 국토지반정보 포털시스템을 활용하여 확보하였다. 그 결과 내진설계기준 공통적용사항에서 제시하는 응답스펙트럼과 지반응답해석에서 얻어진 응답스펙트럼은 지반분류에 상관없이 대략적으로 일치하는 것을 알 수 있었다. 하지만, 증폭계수를 활용하여 지표면최대가속도를 산출할 경우 지반응답해석에서 얻어진 결과와 상당한 차이를 나타내는 것을 알 수 있었다.