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TIGRAN BAGRAMYAN 한국산업응용수학회 2017 Journal of the Korean Society for Industrial and A Vol.21 No.1
A general optimal recovery problem is to approximate a value of a linear operator on a subset (class) in linear space from a value of another linear operator (called information), measured with an error in given metric. We use this formulation to investigate the classical computerized tomography problem of inversion of the noisy Radon transform.
Tigran, Harutyunyan,Anna, Karapetyan,Galina, Hovhannisyan,Rouben, Aroutiounian Korean Society of Environmental Biology 2013 환경생물 : 환경생물학회지 Vol.31 No.3
Mycotoxins such as aflatoxin B1 (AFB1), ochratoxin A (OTA) and zearalenone (ZEA) are widespread contaminants of food and feedstuffs. It is very likely, that humans and animals are always exposed to mixtures of mycotoxins rather than to individual compounds. Therefore, risk assessments should consider mixture toxicity data. In the present study the combination of AFB1, OTA and ZEA was tested for genotoxicity in rat bone marrow and blood leukocytes after 15, 30 and 60 days treatment. The level of DNA damage was determined by the comet assay. The tail intensity and Olive tail moment in leukocytes and bone marrow cells were significantly higher than in controls. At the same time, the level of DNA damage in bone marrow cells was higher than in leukocytes. The data suggests that prolonged exposure to mycotoxins combination through food consumption can induce DNA damage contributing to the harmful effects in vivo.
( Harutyunyan Tigran ),( Karapetyan Anna ),( Hovhannisyan Galina ),( Aroutiounian Rouben ) 한국환경생물학회 2013 환경생물 : 환경생물학회지 Vol.31 No.3
Mycotoxins such as aflatoxin B1 (AFB1), ochratoxin A (OTA) and zearalenone (ZEA) are widespread contaminants of food and feedstuffs. It is very likely, that humans and animals are always exposed to mixtures of mycotoxins rather than to individual compounds. Therefore, risk assessments should consider mixture toxicity data. In the present study the combination of AFB1, OTA and ZEA was tested for genotoxicity in rat bone marrow and blood leukocytes after 15, 30 and 60 days treatment. The level of DNA damage was determined by the comet assay. The tail intensity and Olive tail moment in leukocytes and bone marrow cells were significantly higher than in controls. At the same time, the level of DNA damage in bone marrow cells was higher than in leukocytes. The data suggests that prolonged exposure to mycotoxins combination through food consumption can induce DNA damage contributing to the harmful effects in vivo.
Torosyan Tigran,Vardanyan Arax 한양대학교 아태지역연구센터 2024 Journal of Eurasian Studies Vol.15 No.1
The article discusses the problems of the effectiveness of a comparative analysis method used for diaspora studies. Depending on their nature, diasporas can be either comparable or non-comparable. The article provides a methodology for studying diasporas as well as its paradigm and implementation algorithm. It relies on the approach that one of the key factors of comparative analysis is whether the cases compared are comparable or not. Thus, it becomes necessary to reveal the nature of diasporas and their communities. To ensure the effectiveness of the analysis of comparable diasporas, the article proposes to classify the variables defining diasporas into two groups: identity variables and institutional variables. Identity variables can be used when there is a need for more detailed assessment of the nature of diasporas. The comparative analysis of diasporas or communities with the same nature should be based on institutional variables. The article examines the cases of the Armenian community in Russia and Lebanon to test the proposed methodology. It argues that these communities have different nature and thus their comparative analysis for the purpose of disclosing the prerequisites for the preservation of identity and effective functioning of institutions is senseless.
Investigation of CdS Films Prepared by Using Chemical Bath Deposition
이기진,알센바바쟈얀,Tigran Sargsyan,차덕준 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.53 No.2
Cadmium-sulphide (CdS) films were prepared on glass substrates by using a chemical bath deposition method. The dependences of the microstructures and the morphologies of CdS films on the annealing temperatures were investigated by using X-ray diffraction, scanning electron microscopy and atomic force microscopy. The change in the sheet resistance due to dierent annealing temperatures was studied by using a near-eld microwave microprobe by measuring the reflection coefficient S11. As the annealing temperature increased from room temperature to 300 ℃, the sheet resistance of the CdS films decreased, the surface roughness and grain size decreased and the surface showed a smoother morphology.
Harutyun Melikyan,Tigran Sargsyan,Arsen Babajanyan,Seungwan Kim,Jongchel Kim,이기진 한국물리학회 2009 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.55 No.1
A near-field scanning microwave microscope (NSMM) system incorporating an atomic force microscope (AFM) cantilever probe tip was used for the direct imaging of magnetic domains The NSMM images of domain were obtained by measuring the microwave reflection coefficient S11 at an operating frequency near 4.1 GHz and were compared with the magnetic force microscope (MFM) image. The AFM cantilever probe tip with the NSMM coupled to the tuning fork distance control system provided nano-spatial resolution. The NSMM incorporating an AFM tip offers a reliable means for quantitatively measuring of magnetic domains with nano-scale resolution and high sensitivity. A near-field scanning microwave microscope (NSMM) system incorporating an atomic force microscope (AFM) cantilever probe tip was used for the direct imaging of magnetic domains The NSMM images of domain were obtained by measuring the microwave reflection coefficient S11 at an operating frequency near 4.1 GHz and were compared with the magnetic force microscope (MFM) image. The AFM cantilever probe tip with the NSMM coupled to the tuning fork distance control system provided nano-spatial resolution. The NSMM incorporating an AFM tip offers a reliable means for quantitatively measuring of magnetic domains with nano-scale resolution and high sensitivity.
Investigation of the Photovoltaic Effect in Solar Cells by Using a Near-field Microwave Microscope
Arsen Babajanyan,Tigran Sargsyan,Harutyun Melikyan,Seungwan Kim,Jongchel Kim,이기진 한국물리학회 2009 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.55 No.1
A near-field microwave microscope (NFMM) technique has been used to investigate the photovoltaic effect in solar cells. By measuring the reflection coefficient S11 at an operating frequency near 4.1 GHz, we could observe the photoconductivity changes inside the solar cells. The photoconductivity of the n-type silicon layer in a solar cell increased as the incident light’s intensity was increased due to the carrier motion through the pn junction. The photoconductivity also varied with the incident light’s wavelength. We found good agreement between the variations in the microwave reflection coefficient S11 and the IV characteristics of solar cells for different incidentlight intensities and wavelengths. A near-field microwave microscope (NFMM) technique has been used to investigate the photovoltaic effect in solar cells. By measuring the reflection coefficient S11 at an operating frequency near 4.1 GHz, we could observe the photoconductivity changes inside the solar cells. The photoconductivity of the n-type silicon layer in a solar cell increased as the incident light’s intensity was increased due to the carrier motion through the pn junction. The photoconductivity also varied with the incident light’s wavelength. We found good agreement between the variations in the microwave reflection coefficient S11 and the IV characteristics of solar cells for different incidentlight intensities and wavelengths.
Kim, Songhui,Yoon, Youngwoon,Lee, Hanju,Choi, Ah Reum,Jung, Kwang-Hwan,Babajanyan, Arsen,Abrahamyan, Tigran,Yoo, Hyungkeun,Lee, Jung-Ha,Cha, Deokjoon,Berthiau, Gerard,Friedman, Barry,Lee, Kiejin Wiley 2013 Journal of biophotonics Vol.6 No.2
<P>We study the opto-electrical properties of Natronomonas pharaonis sensory rhodopsin II (NpSRII) by using a near-field microwave microprobe (NFMM) under external light illumination. To investigate the possibility of application of NFMM to biological macromolecules, we used time dependent properties of NPSRII before/after light activation which has three distinct states - ground-state, M-state, and O-state. The diagnostic ability of NFMM is demonstrated by measuring the microwave reflection coefficient (S(11)) spectrum of NpSRII under steady-state illumination in the wavelength range of 350-650 nm. Moreover, we present microwave reflection coefficient S(11) spectra in the same wavelength range for two fast-photocycling rhodopsins: green light-absorbing proteorhodopsin (GPR) and Gloeobacter rhodopsin (GR). In addition the frequency sweep shift can be detected completely even for tiny amounts of sample (10(-3) OD of rhodopsin). Based on these results NFMM shows both very high sensitivity for detecting conformational changes and produces a good time-resolved spectrum.</P>