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Background model for the NaI(Tl) crystals in COSINE-100
Adhikari, P.,Adhikari, G.,Souza, E. Barbosa de,Carlin, N.,Choi, S.,Choi, W. Q.,Djamal, M.,Ezeribe, A. C.,Ha, C.,Hahn, I. S.,Hubbard, A. J. F.,Jeon, E. J.,Jo, J. H.,Joo, H. W.,Kang, W. G.,Kauer, M.,Kan Springer Berlin Heidelberg 2018 European Physical Journal C Vol.78 No.6
<P>The COSINE-100 dark matter search experiment is an array of NaI(Tl) crystal detectors located in the Yangyang Underground Laboratory (Y2L). To understand measured backgrounds in the NaI(Tl) crystals we have performed Monte Carlo simulations using the Geant4 toolkit and developed background models for each crystal that consider contributions from both internal and external sources, including cosmogenic nuclides. The background models are based on comparisons of measurement data with Monte Carlo simulations that are guided by a campaign of material assays and are used to evaluate backgrounds and identify their sources. The average background level for the six crystals (70 kg total mass) that are studied is 3.5 counts/day/keV/kg in the (2–6) keV energy interval. The dominant contributors in this energy region are found to be [FORMULA OMISSION]Pb and [FORMULA OMISSION]H.</P>
Initial performance of the COSINE-100 experiment
Adhikari, G.,Adhikari, P.,de Souza, E. Barbosa,Carlin, N.,Choi, S.,Choi, W. Q.,Djamal, M.,Ezeribe, A. C.,Ha, C.,Hahn, I. S.,Hubbard, A. J. F.,Jeon, E. J.,Jo, J. H.,Joo, H. W.,Kang, W. G.,Kang, W.,Kaue Springer-Verlag 2018 European Physical Journal C Vol.78 No.2
( D. L. Salin ),( W. F. Hahn ),( A. Somwaru ) 세종대학교 경제통합연구소 (구 세종대학교 국제경제연구소) 2005 Journal of Economic Integration Vol.20 No.1
Exporting countries are concerned that sanitary standards might shield domestic industry from foreign competition. This study analyzes economic effects of changes in Western Hemisphere sanitary requirements on broiler trade in the Americas. A mathematical programming model detects that if Brazil and Mexico are allowed to export fresh, chilled, and frozen poultry meat to the United States and Canada then the United States becomes an importer of value added broiler products and looses market share to Brazil in world broiler market. Due to geographic location, Mexico expands exports to the United States.
Cho, K. H.,Cho, H. Y.,Hahn, S.,Feindel, D. Mason, F.,Blaustein, P. R.,Kim, K. W. 대한전자공학회 1991 ICVC : International Conference on VLSI and CAD Vol.2 No.1
We investigated various properties of band-pattern induced during waxless polishing process using the magic mirror method. In order to understand the origin of this pattern and it, effects upon various physical properties of the Si wafer; total thickness variation (TIV) mapping, strain/damage measurement, microsurface roughness measurement, and electrical. parameter measurements such as oxide breakdown strength and tune dependent dielectric breakdown have been performed. The data show that polishing band-pattern is a by-product of uneven polishing removal rates due to less than the ideal polishing process control and it does not affect the integrity of thermal oxides greater than 1.5 nm thick.