• Title/Summary/Keyword: Near infrared

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A Review of Neural Networks in Near Infrared Spectroscopy

  • R.James Berry
    • Near Infrared Analysis
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    • v.2 no.1
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    • pp.25-28
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    • 2001
  • The purpose of this paper is to review the advances in combining near infrared spectroscopy (NIR) with artificial neural networks (NNs). The paper briefly introduces NNs, explains why they are of particular use in NIR research, then reviews their presence in published research.

Classification of Cultivation Years of Ginseng using Near-Infrared(NIR) Reflectance Spectroscopy

  • Woo, Young-Ah;Cho, Chang-Hee;Kim, Hyo-Jin;Kim, Su-Jeong;Lee, Nam-Yun;Kim, Kyung-Doo;Seong, Ki-Yong
    • Near Infrared Analysis
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    • v.1 no.1
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    • pp.19-22
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    • 2000
  • The application of near infrared reflectance spectroscopy to determine the cultivation years of ginseng is reported. The objective of this study is to develop a nondestructive and accurate method using near infrared (NIR) reflectance spectroscopy and pattern recognition techniques. Four 5, and 6-year-old ginseng samples are studied. Though there are no serious difference in the NIR spectra according to cultivation years, the spectra were moderately differentiated based on cultivation years using pattern recognition method based on principal component analysis. It is shown that there are qualitative differences according to cultivation years. In order to develop classification rules, two pattern recognition techniques such as discriminant partial least squares (PLS2) method and soft independent modeling of class analogies (SIMCA) have been carried out. As a result, near infrared reflectance spectroscopy using pattern recognition is shown to have significant potential as a rapid and nondestructive method for the determination of cultivation years of ginseng.

JK PHOTOMETRY OF BRIGHT GIANTS IN NGC6712

  • KYEONG JAE-MANN;BYUN YONG-IK
    • Journal of The Korean Astronomical Society
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    • v.31 no.2
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    • pp.127-140
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    • 1998
  • With a large format near-infrared camera at the 2.2-m telescope on Mauna Kea Observatory, we performed J K near-infrared observations for the metal rich globular cluster NGC6712. This cluster lies near the galactic plane and therefore suffers heavy reddening. We present the near-infrared color-magnitude diagram and also derive the metallicity ([Fe/H] ${\~}-0.96{\pm}0.27$) as well as its distance modulus ((m - M) ${\~}13.42{\pm}0.12$).

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Near-infrared face recognition by fusion of E-GV-LBP and FKNN

  • Li, Weisheng;Wang, Lidou
    • KSII Transactions on Internet and Information Systems (TIIS)
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    • v.9 no.1
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    • pp.208-223
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    • 2015
  • To solve the problem of face recognition with complex changes and further improve the efficiency, a new near-infrared face recognition algorithm which fuses E-GV-LBP and FKNN algorithm is proposed. Firstly, it transforms near infrared face image by Gabor wavelet. Then, it extracts LBP coding feature that contains space, scale and direction information. Finally, this paper introduces an improved FKNN algorithm which is based on spatial domain. The proposed approach has brought face recognition more quickly and accurately. The experiment results show that the new algorithm has improved the recognition accuracy and computing time under the near-infrared light and other complex changes. In addition, this method can be used for face recognition under visible light as well.

Near Infrared Diffuse Reflectance Spectroscopy to Measure Pulmonary Edema

  • Larry Leonardi;David H.Burns;Luis Openheimer;Rene P.Michel
    • Near Infrared Analysis
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    • v.2 no.1
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    • pp.43-53
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    • 2001
  • A non-invasive spectroscopic method is presented for the measurement of pulmonary edema. Both early diagnosis and quantitative edema estimates were investigated. The spectroscopic determination of pulmonary edema involved the acquisition of diffuse reflectance spectra in the near-infrared (NIR) region with change in water concentration - water is the main constituent of edema fluid. Pulmonary edema was induced into the excised perfused lungs of seven animals by elevating the hydrostatic pressure. Estimates of edema were ascertained from a partial least squares regression of the measured spectral response. Actual edema was determined from the change (increase) in total lung weight. Estimates in relative lung weight increases due to in vitro edema were made with the near infrared spectra. The results revealed that fluid accumulation produced spectral changes in the O-H and C-H absorptions as well as scattering changes in the spectra. Histology of the lung was used to verify the presence or absence of interstitial and alveolar edema. Results demonstrated that near infrared spectroscopy might provide a new tool for clinical assessment of pulmonary edema.

Clinical Application of Near-Infrared Spectroscopy in Neonates

  • Jeon, Ga Won
    • Neonatal Medicine
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    • v.26 no.3
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    • pp.121-127
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    • 2019
  • The incidence of cerebral palsy has not decreased despite advances in neonatal care. Preterm infants are at a high risk of cerebral palsy. Moreover, preterm infants might experience permanent neurological sequelae due to injury in the preterm brain. Although the etiology of preterm brain injury is not fully understood, preterm brain injury is strongly associated with abnormal cerebral perfusion and oxygenation. Monitoring systemic blood pressure or arterial oxygen saturation using pulse oximetry is not enough to guarantee proper cerebral perfusion or oxygenation. Early detection of improper cerebral perfusion can prevent irreversible cerebral damage. To decrease brain injury through the early detection of under-perfusion and deoxygenation, other diagnostic modalities are needed. Near-infrared spectroscopy can continuously and noninvasively monitor regional oxygen saturation (rSO2), which reflects the perfusion and oxygenation status of tissues at bedside. Near-infrared spectroscopy represents a balance between tissue oxygen supply and demand. Cerebral rSO2 monitoring has been used most frequently in neonatal cardiac surgery to monitor cerebral oxygenation and prevent hypoxic damage or shock. Recently, cerebral, renal, or splanchnic rSO2 in neonates is frequently monitored. The progression of a disease, brain injury, and death can be prevented by detecting changes in rSO2 values using near-infrared spectroscopy. In this article, the basic principles, usefulness, and applications of near-infrared spectroscopy in neonates are discussed.