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Effect of Temperature and Gamma-Ray Irradiation on Optical Characteristics of Fiber Bragg Grating Inscribed Radiation-Resistant Optical Fiber

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Photonic Sensors 2020年第1期10卷 16-33页

作者： Seongmin JU Youngwoong KIM Kadathala LINGANNA Yune Hyoun KIM won-taek han School of Electrical Engineering and Computer Science Gwangju Institute of Science and TechnologyGwangju 61005South Korea Smart Photonics Research Center/Advanced Optical Lens Research Center/Laser Research Center Korea Photonics Technology InstituteGwangju 61007South Korea

A new radiation-hard germano-silicate glass optical fiber with a pure silica glass buffer and a boron-doped silica glass inner cladding was fabricated for temperature sensor application based on the fiber Bragg grating(FBG)underg-ray irradiation *** temperature dependences of optical attenuation at 1550.5 nm and Bragg reflection wavelength shift from 18℃to 40℃before theγ-ray irradiation were about 4.57´10^(-4)dB/℃and 5.48 pm/℃,*** radiation-induced optical attenuation at 1550.5 nm and the radiation-induced Bragg reflection wavelength shift under theγ-ray irradiation with the total dose of 22.85 kGy at 35℃were about 0.03 dB/m and 0.12 nm,respectively,with theγ-ray irradiation sensitivity of 5.25´10^(-3)pm/*** temperature and theγ-ray irradiation dependence of optical attenuation at 1550.5 nm in the FBG written fiber with boron-doped silica glass inner cladding were about 6 times and 4 times lower than that in the FBG written fiber without boron-doped silica glass inner cladding under a temperature change from 18℃to 40℃and theγ-ray irradiation with the total dose of 22.85 kGy at 35℃,***,the effect of temperature increase on the Bragg reflection wavelength of the FBG written fiber with boron-doped silica inner cladding was much larger about 1000 times than that of theγ-ray ***,no influence on the reflection power of the Bragg wavelengths and the full width at half maximum(FWHM)bandwidth under temperature and theγ-ray irradiation change was ***,after theγ-ray irradiation with the dose of 22.85 kGy,no significant change in the refractive index was found but the residual stresses developed in the fiber were slightly relaxed or retained.

关键词： Optical fiber radiation resistance temperature sensor fiber Bragg grating radiation-induced attenuation

Thermal Stabilization of EDFA gain by hybrid concatenation of antimony-doped silica EDF

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光学学报 2003年第S1期23卷 419-420页

作者： Young-Eun Im Uh-Chan Ryu P. Babu won-taek han K. Oh David J. DiGiovanni Baishi Wang Anand Hariharan Department of Information and Communications K-JIST Kwangju 500712 Rep. of Korea OFS Laboratories 700 Moutain Ave. Murray Hill NJ 07974 USA OFS Fitel SPD 19 Schoolhouse Road Somerset NJ 08873 USA

Sb-doped silica EDF showed an opposite temperature dependent gain profile compared to Al-doped silica EDF. Concatenation of those two EDFs showed a gain variation less than ?0.4 dB over 40nm of C-band with the 15dB ga... 详细信息

关键词： range of

Effect of Radiant Spectral Characteristics on Performance of a Near-Infra-Red Heating Module

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Journal of Thermal Science 2011年第6期20卷 510-515页

作者： Ju-Hyun Kim won-taek Choi Minsub han School of Mechanical System Engineering University of Incheon Araytech IncheonKorea

We simulated the heat transfer phenomena of the heating module that is primarily based on the radiant energy in the near-infra-red(NIR) *** the module,the power emitted by the lamp filament is distributed to the lamp glass,reflector,and the target medium,which are cooled by an air *** radiant heat transfer is simulated by using the ray-tracing scheme,in which the spectral characteristics of the emission and the materials are *** heat transport from the lamp glass to the cooling air is analyzed by using the finite volume *** the lamp-filament temperature rises in the range of 3000-3400K,the NIR radiant power on the target medium ***,the lamp-glass temperature also rises,and the proportion of the NIR power to the entire radiation has a peak in the temperature *** spectral distributions of the absorbed energies in all the components in the module are highly non-uniform,and a monochromatic model of the radiant heat transfer may result in a significant discrepancy.

关键词： Computational Fluid Dynamics(CFD) Curing Drying Coating process

Fe_(3)GeTe_(2):a site-differentiated Hund metal

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npj Computational Materials 2022年第1期8卷 2355-2360页

作者： taek Jung Kim Siheon Ryee Myung Joon han Department of Physics KAISTDaejeon34141Republic of Korea I.Institute of Theoretical Physics University of HamburgNotkestrasse 9-11Hamburg22607Germany

Magnetism in two-dimensional(2D)van der Waals(vdW)materials has lately attracted considerable attention from the point of view of both fundamental science and device ***,establishing a detailed and solid understanding of their magnetism is the key first step toward various *** Fe_(3)GeTe_(2)is a representative ferromagnetic(FM)metal in this family,many aspects of its magnetic and electronic behaviors still remain ***,we report our new finding that Fe_(3)GeTe_(2)is a special type of correlated metal known as“Hund metal”.Furthermore,we demonstrate that Hund metallicity in this material is quite unique by exhibiting remarkable site dependence of Hund correlation strength,hereby dubbed“site-differentiated Hund metal”.Within this new picture,many of the previous experiments can be clearly understood,including the ones that were seemingly contradictory to one another.

关键词： strength establishing metallic

Prediction of high thermoelectric performance in the lowdimensional metal halide Cs_(3)Cu_(2)I_(5)

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npj Computational Materials 2021年第1期7卷 476-481页

作者： Young-Kwang Jung In taek han Yong Churl Kim Aron Walsh Department of Materials Science and Engineering Yonsei UniversitySeoulSouth Korea Samsung Advanced Institute of Technology(SAIT) Samsung Electronics Materials Research ComplexYoungtongSuwonSouth Korea Department of Materials Imperial College LondonLondonUK

Metal halides have emerged as a new generation of semiconductors with applications ranging from solar cells to chemical *** assess the thermoelectric potential of Cs_(3)Cu_(2)I_(5),which has a crystal structure formed of zero-dimensional[Cu_(2)I_(5)]3−anionic clusters that are separated by Cs+counter *** find the compound exhibits the characteristics of a phonon-glass electroncrystal with a large imbalance in the conduction of heat and electrons predicted from first-principles transport *** anharmonic phonon–phonon scattering results in short-lived acoustic vibrations and an ultra-low lattice thermal conductivity(10 cm^(2)V^(−1)s^(−1)).For an n-type crystal at 600 K,a thermoelectric figure-of-merit ZT of 2.6 is found to be accessible,which for a cold source of 300 K corresponds to a thermodynamic heat-to-electricity conversion efficiency of 15%.

关键词： theory phonon crystal

Neuroprotective effects of tadalafil on gerbil dopaminergic neurons following cerebral ischemia

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Neural Regeneration Research 2013年第8期8卷 693-701页

作者： Kwang taek Kim Kyung Jin Chung han Sae Lee Il Gyu Ko Chang Ju Kim Yong Gil Na Khae Hawn Kim Department of Urology Gachon University Gil Medical CenterGachon University Department of Physiology College of MedicineKyung Hee University Department of Urology Chungnam National University HospitalChungnam National University School of Medicine

Impairment of dopamine function, which is known to have major effects on behaviors and cognition, is one of the main problems associated with cerebral ischemia. Tadalafil, a long-acting phosphodiesterase type-5 inhibitor, is known to ameliorate neurologic impairment induced by brain injury, but not in dopaminergic regions. We investigated the neuroprotective effects of treatment with tadalafil on cyclic guanosine monophosphate level and dopamine function following cerebral ischemia. Forty adult Mongolian gerbils were randomly and evenly divided into five groups （n = 8 in each group）： Sham-operation group, cerebral ischemia-induced and 0, 0.1, 1, and 10 mg/kg tadalafil-treated groups, respectively. Tadalafil dissolved in distilled water was administered orally for 7 consecutive days, starting 1 day after surgery. Cyclic guanosine monophosphate assay and immunohistochemistry were performed for thyrosine hydroxylase expression and western blot analysis for dopamine D2 receptor expression. A decrease in cyclic guanosine monophosphate level following cerebral ischemia was found with an increase in thyrosine hydroxylase activity and a decrease in dopamine D2 receptor expression in the striatum and substantia nigra region. However, treatment with tadalafil increased cyclic guanosine monophosphate expression, suppressed thyrosine hydroxylase expression and increased dopamine 92 receptor expression in the striatum and substantia nigra region in a dose-dependent manner. Tadalafil might ameliorate cerebral ischemia-induced dopaminergic neuron injury. Therefore, tadalafil has the potential as a new neuroprotective treatment strategy for cerebral ischemic injury.

关键词： neural regeneration brain injury cerebral ischemia Tadalafil phosphodiesterase type-5 inhibitor dopamine dopamine D2 receptor cyclic guanosine monophosphate grants-supported paper photographs-containing paper neuroregneration

Sprinkle formulations——A review of commercially available products

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Asian Journal of Pharmaceutical Sciences 2020年第3期15卷 292-310页

作者： han Sol Lee Jeong-Jun Lee Myeong-Gyu Kim Ki-taek Kim Cheong-Weon Cho Dae-Duk Kim Jae-Young Lee College of Pharmacy Chungnam National UniversityDaejeon 34134Republic of Korea Graduate School of Clinical Pharmacy CHA UniversityPocheon 11160Republic of Korea College of Pharmacy and Natural Medicine Research Institute Mokpo National UniversityJeonnam 58554Republic of Korea College of Pharmacy and Research Institute of Pharmaceutical Sciences Seoul National UniversitySeoul 08826Republic of Korea

Currently, sixty-five original sprinkle drug products are available in various dosage forms including tablets, powders, granules, immediate-release capsules, extended-release capsules, delayed-release capsules, and multiparticulate drug delivery systems. By sprinkling on soft food vehicles, these products provide dosing flexibility and convenience of administration, which potentially improve the compliance of patients with *** to these advantages, the growth of sprinkle products picked up since the 1990s, and several regulatory issues regarding this dosage form have been raised and *** this article, the types of sprinkle formulations were discussed by dividing them into seven categories, and the commercial products were summarized in terms of the drug substance, pharmaceutical excipients, storage conditions and administration methods. In addition, several US Food and Drug Administration guidelines related to the regulatory issues of sprinkle formulations were reviewed, which led to the conclusion that the future development of this promising dosage form demands integrated guidance for industry rather than scattered information in various documents.

关键词： Sprinkle formulation Soft food Geriatric Pediatric Dysphagia Guidance for industry

Magnesium citrate with a single dose of sodium phosphate for colonoscopy bowel preparation

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World Journal of Gastroenterology 2011年第2期17卷 242-248页

作者： Yong Sung Choi Jung Pil Suh Jong Kyu Kim In taek Lee Eui Gon Youk Doo Seok Lee Do Sun Kim Doo han Lee Department of Gastroenterology Daehang Hospital Department of Surgery Daehang Hospital

AIM:To evaluate the efficacy and acceptability of magnesium citrate and a single dose of oral sodium phosphate(45 mL) solution for morning colonoscopy bowel preparation. METHODS:A total of 159 patients were randomly assigned to receive two split doses of 90 mg of sodium phosphate(GroupⅠ,n=79) or magnesium citrate(250 mL,the day before the procedure) followed by 45 mL of sodium phosphate(the day of procedure,GroupⅡ,n= 80) .The quality of bowel cleansing and the acceptability of each regimen were compared,including the satisfaction,taste,willing to repeat and adverse effects of each regimen. RESULTS:The quality of bowel cleansing of GroupⅡ was as good as that of GroupⅠ(An Aronchick scale score of good or excellent:70.9%vs 81.0%,respectively,P=0.34;the Ottawa system score:4.4±2.6 vs 3.8 ±3.0,respectively,P=0.76) .There was no statisticallysignificant difference between both groups with regard to acceptability,including the satisfaction,taste and willingness to repeat the regimen.A significantly greater number of older patients(over 65 years old) in Group Ⅱgraded the overall satisfaction as satisfactory(48.1% vs 78.1%,respectively;GroupⅠvs GroupⅡ,P=0.01) . There were no significant adverse reactions. CONCLUSION:Magnesium citrate and a single dose of sodium phosphate was as effective and tolerable as the conventional sodium phosphate regimen and is a satisfactory option.

关键词： Colonoscopy Bowel preparation Efficacy Acceptability Magnesium citrate Sodium phosphate

Two-photon interference between continuous-wave coherent photons temporally separated by a day

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Photonics Research 2020年第3期8卷 338-342页

作者： DANBI KIM JIHO PARK taek JEONG HEONOH KIM han SEB MOON Department of Physics Pusan National UniversityGeumjeong-GuBusan 46241South Korea

An understanding of the phenomenon of light interference forms the kernel underlying the discovery of the nature of light from the viewpoints of both classical physics and quantum *** we report on two-photon interference with temporally separated continuous-wave coherent photons by using a temporal post-selection method with an arbitrary time *** the temporal separation of a day between the photons is considerably longer than the coherence time of the light source,we observe the Hong–Ou–Mandel(HOM)interference of the pairwise two-photon ***,we experimentally demonstrate the HOM interference observed in one of the interferometer-output modes by using only one single-photon detector for a large temporal separation.

关键词： separated coherent photon