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Small target detection using cross product based on temporal profile in infrared image sequences
Bae, T.W.,Kim, B.I.,Kim, Y.C.,Sohng, K.I. Pergamon Press ; Elsevier Science Ltd 2010 Computers & electrical engineering Vol.36 No.6
This paper presents a new small target detection method using cross product of temporal pixels based on temporal profiles in infrared (IR) image sequences. Temporal characteristics of small targets and various backgrounds are different. A new algorithm classifies target pixels and background pixels through hypothesis testing using the cross product of pixels on temporal profile and predicts the temporal backgrounds based on the results. Small target pixels are detected by subtracting the predicted temporal background profile from the original temporal profile. For performance comparison between the proposed method and the conventional methods, the receiver operating characteristics (ROC) curves were computed experimentally. Experimental results show that the proposed algorithm has better discrimination of target and clutter pixels and lower false alarm rates than conventional methods.
DEEP INFRARED SURVEYS OF STAR FORMING REGIONS IN THE MWG AND LMC
NAKAJIMA YASUSHI The Korean Astronomical Society 2005 Journal of The Korean Astronomical Society Vol.38 No.2
On behalf of the IRSF/SIRIUS group, I introduce some recent results from our deep near-infrared surveys (J, Hand Ks bands, limiting magnitude of Ks=17) toward star forming regions in the Milky Way Galaxy (MWG) and Large Magellanic Cloud (LMC) with the near-infrared camera SIRIUS. We discovered a rich population of low-mass young stellar objects associated with the W3 and NGC 7538 regions in the MWG based on the near-infrared colors arid magnitudes. The high sensitivity of our survey enables us to detect intermediate-mass pre-main sequence stars, i.e. HAEBE stars, even in the LMC. We detected many HAEBE candidate stars in the N159/N160 complex star forming region in the LMC with the IRSF 1.4-m telescope. Spatial distributions of the young stellar objects indicate the sequential cluster formation in each star forming region in the complex and large scale (a few ${\times}$ 100 pc) sequential cluster formation over the entire complex.
AKARI INFRARED OBSERVATIONS OF EMBEDDED YSOs IN THE MAGELLANIC CLOUDS
Shimonishi, T.,Onaka, T.,Kato, D.,Sakon, I.,Ita, Y.,Kawamura, A.,Kaneda, H. The Korean Astronomical Society 2012 天文學論叢 Vol.27 No.4
Spectroscopic studies of extragalactic YSOs have shown a great progress in the last few years. Infrared observations with AKARI made significant contributions to that progress. In this proceeding, we are going to introduce our current research on the infrared observations of ices and dust around embedded YSOs in the Magellanic Clouds.
NEAR-IR PHOTOMETRIC STUDY OF THE FU ORIONIS OBJECT HBC 722
성현일,박원기,양유나,이상각,윤태석,이정은,강원석,박근홍,조동환,박선경 한국천문학회 2013 Journal of The Korean Astronomical Society Vol.46 No.6
We present near-infrared light curves of HBC 722 after its the September 2010 outburst. We have been monitoring its near-infrared light curves since November 2010 with Korean Astronomy and Space Science Institute Infrared Camera System (KASINICS). HBC 722 exhibits large changes in optical and near-infrared brightness since its outburst. The $J$, $H$, and $K_s$ light curves over about 2.5 years show that in all observed bands HBC 722 progressively became fainter until around April 2011, down to $J \sim$10.7, $H \sim$9.9, $K_s\sim$9.3, but it is getting brighter again. Large scatter in the obtained light curve prevents us from finding whether there is any short timescale variation as reported in other optical observations. The near-infrared color of HBC 722 is becoming bluer since its outburst. The pre-outburst Spectral Energy Distribution (SED) of HBC 722 is consistent with that of a slightly reddened Class II YSO with the exception of the extraordinary IR-excess in the far-infrared region.
Jun Son Young,Kim Young Ah,Lee Suk-Jun,Jung Woon-Won,Kim Hyun-Sook,Kim Sung-Soo,Kim Hyunsoo,Yong Dongeun,Lee Kyungwon 대한진단검사의학회 2023 Annals of Laboratory Medicine Vol.43 No.2
Background: Development of an accessible method to routinely evaluate the clonality of strains is needed in microbiology laboratories. We compared the discriminatory power of the Fourier-transform infrared (FTIR) spectroscopy–based IR Biotyper (Bruker Daltonics GmbH, Bremen, Germany) to matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF MS), using whole-genome sequencing (WGS) as the reference method. Methods: Eighty-three extended-spectrum β-lactamase–producing Escherichia coli isolates were tested using WGS, MALDI-TOF MS, and IR Biotyper. Simpson’s diversity index (SDI), a statistical analysis for testing the homogeneity of a dendrogram, and the adjusted Rand index (aRI) were used to compare the discriminatory ability between typing tests. Results: The SDI (95% confidence interval) was 0.969 (0.952–0.985) for WGS, 0.865 (0.807–0.924) for MALDI-TOF MS, and 0.974 (0.965–0.983) for IR Biotyper. Compared with WGS, IR Biotyper showed compatible diversity, whereas MALDI-TOF MS did not. The concordance and aRI improved from 66.3% to 84.3% and from 0.173 to 0.538, respectively, for IR Biotyper versus MALDI-TOF MS with WGS as the reference method. IR Biotyper showed substantially improved performance in strain typing compared with MALDI-TOF MS. Conclusions: IR Biotyper is useful for diversity analysis with improved discriminatory power over MALDI-TOF MS in comparison with WGS as a reference method. IR Biotyper is an accessible method to evaluate the clonality of strains and could be applied in epidemiological analysis during an outbreak of a health care facility, as well as for research on the transmission of resistant bacteria in community settings.
웨이블렛 적외선열화상에 의한 결함 탐상 메커니즘의 위상대비 정량화 분석
이효원(Hyowon Lee),김원태(Wontae Kim) 한국비파괴검사학회 2020 한국비파괴검사학회지 Vol.40 No.2
능동 적외선열화상 기법은 다양한 재료, 구조물의 비파괴검사 방법으로 신뢰할 수 있는 기법으로 평가받고 있다. 그러나 불균일한 가열, 낮은 공간 분해능, 환경 노이즈와 적외선 카메라의 낮은 해상도, 낮은 이미지 획득 수와 같은 제한으로 인해 결함의 정량화에 어려움이 발생하고 있다. 결함 정량화 개선을 위해 신호 처리 기법이 요구되고 있다. 본 논문에서는 결함 정량화 개선을 위한 웨이블렛 변환 기법을 연구하였다. 알루미늄 시험편에 다양한 크기와 직경의 정사각형 결함이 고려되었으며, 펄스 적외선열화상 기법을 이용하여 얻은 열화상 이미지 시퀀스에 웨이블렛 변환을 적용하여 위상 각 데이터를 얻었다. 웨이블렛 파라미터인 스케일과 시프트의 영향을 분석하여 건전부와 결함부의 위상 대비를 통해 결함 검출능을 개선하였다. Active infrared thermography has been proved as a reliable method for nondestructive testing of various materials and structures. However, limitations such as uneven heating, low spatial resolution, environmental noise and low resolution of infrared cameras, and low number of acquired images make it difficult to quantify defects. Signal processing techniques are required to improve defect quantification. In this paper, a wavelet transform method for defect quantification is studied. Square defects of various sizes and diameters were considered for aluminum specimens. Phase angle data were collected by applying wavelet transform to the thermal image sequence obtained using pulsed thermography. Conclusively, defect detection was evaluated by the phase contrast between sound and defect region, and then the effects of wavelet parameters scale and shift were studied.
SUBARU EXPLORATIONS OF EXO-SOLAR PLANETS AND DISKS
TAMURA MOTOHIDE The Korean Astronomical Society 2005 Journal of The Korean Astronomical Society Vol.38 No.2
To date, more than 150 exo-solar planets have been observed by various methods such as spectroscopic, photometric, astrometric, gravitational lensing, pulsar timing methods. However, all these are indirect methods; they do not directly image the planets. Only free-floating planets or their 'ana-log' have been directly detected so far. Thus the next milestone is the direct imaging of any kinds of planetary mass objects orbiting around normal (young) stars, which might have been associated with protoplanetary disks, the sites of planet formation. I will describe some SUBARU efforts to detect self-luminous young giant planets as companions as well as direct imaging of the protoplanetary disks of ${\~}$100 AU size. The results of near-infrared coronagraphic imaging with adaptive optics are briefly presented on AB Aur, HD 142527, T Tau, and DH Tau. Our results demonstrate the importance of high-resolution (${\~}$0.1 arcsec) direct imaging over indirect observations such as modeling based on spectral energy distributions. The SUBARU observations are a prelude to ALMA from the morphological point of view.
FTIR을 이용한 아크릴레이트 단량체의 광-열 복합경화 거동 연구
김석현(Seok Hyeon Kim),왕혁식(Hyuck Sik Wang),이승혁(Seung Hyuk Lee),부석형(Seok Hyung Bu),송기국(Kigook Song) 한국고분자학회 2018 폴리머 Vol.42 No.4
우레탄 열반응이 가능한 아크릴레이트 단량체의 UV 광경화 거동을 in-situ로 시분해 푸리에 변환 적외선 분광법(FTIR) 실험과 광 DSC 실험을 수행하여 조사하였다. 아크릴레이트 단량체 사이의 우레탄 열반응을 먼저 진행한 후 UV를 쪼여 아크릴레이트 광반응을 유도한 열-광 복합경화 공정이 UV 광경화만 진행한 경우보다 아크릴레이트 반응은 더 빠르게 진행되었지만, 아크릴레이트의 최종 경화율은 약간 감소하였다. 이와 같은 아크릴레이트 단량체 시스템에 긴 사슬의 아크릴레이트 올리고머를 첨가한 시스템에서도 복합경화 공정이 UV 광경화만 진행한 경우 보다 반응은 더 빠르게 진행되었고, 아크릴레이트 경화 정도는 큰 차이 없이 끝까지 진행되었다. The photo-curing behaviors of acrylate monomers capable of urethane thermal reaction were investigated using time-resolved Fourier transform infrared spectroscopy and photo-differential scanning calorimetry. Faster photo-reaction and lower conversion of acrylate reactions were observed in the thermal-photo dual curing process compared to the photo-curing only process. In the case of the acrylate system with long chain oligomers, faster photo-reaction was also observed in the dual curing process although no difference was found in the degree of conversion for acrylates between two photo-curing processes.