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Prof. Han-Yong Jeon Inha University, South Korea
Professor Emeritus Han-Yong Jeon is a geosynthetics/technical organic materials researcher of Inha University, Incheon, South Korea. Since 1998, he is the director of Geosynthetics Institute Korea Directory and has worked in International Geosynthetics Society as Council member (2008~2012) and the 6th president of Korean Geosynthetics Society (2011~2013) and the 32nd President of Korean Fiber Society (2014~2015). He has published more than 1,124 proceedings in the domestic and international conferences and published 228 papers including “A Study on the Radiation Shielding and Absorption Effects of Nonwoven Composites by Monte-Carlo Simulation Analysis”, applied sciences, 12, 3570, 2022 in domestic & international journals. He wrote 30 Korean and English books including 'Review of Sustainable Geosynthetics Development Trend with Environmental Adaptive and Eco-Environmental Performances Point of View’, Geopolymers and Other Geosynthetics, ISBN 978-1-78985-176-2, IntechOpen, 2020. He has awards of Marquis Who'sWho - Science and Engineering in 2003~2017 and Top 100 Scientists in the World: 2005/2011 of IBC (International Biographical Centre, UK). Also, he got the 33rd Academy Award of Korean Fiber Society in 2006 and “Excellent Paper Award of 2012” by The Korean Federation of Science and Technology Societies. Besides this, he got the 33rd Academy Award (The Korean Fiber Society), 2006 and the Best Publication Award (Korea Association of Technical Textile Industry), 2017 and the 41st Prize of Jung-Hun Textile Industry (Academy Award), 2020.
Speech Title: A Study on Radiation shielding Effect of Composite Materials in Radiation-Contaminated Soil Structure by Monte-Carlo N-Particle Transport (MCNP) Simulation
Abstract:The purpose of this study is to investigate radiation shielding effectiveness of various composite materials including nonwoven geotextiles which are installed in the soil structure for the 661.7 keV gamma-rays emitted by cesium 137Cs and it is integral to note that adsorption of cesium ions was not considered. Monte Carlo N-Particle transport (MCNP) simulation was used to simulate a composite designed under various conditions with different contents and structures of PE/concrete, PE/copper, PE/lead, and PE/tungsten composite materials and from this, the gamma-ray shielding ability of composites was analyzed.
As a result of simulations of composites with various structures, the linear attenuation coefficient of the layered composite was not significantly affected by the thickness of the inorganic material layer compared to the composite with other structures. A straight line graph that is inversely proportional to the thickness of the inorganic material layer was checked, but the proportionality constant was negligibly small and no particular trend could be confirmed.
In the analysis of the linear attenuation coefficient according to the content of inorganic materials, as expected, it was confirmed that the linear attenuation coefficient of the composite material increased as the content of the inorganic material increased in all structural composites.
As the energy of the gamma ray approached 100 MeV and the thickness of the composite increased, the difference in linear attenuation coefficient values decreased. However, in the case of fiber composites, an increase in linear attenuation coefficient due to a decrease in fiber diameter was clearly observed for composite materials excluding PE/concrete composite.
The slope at this time could be expressed as a graph of the difference in the linear attenuation coefficient of the two materials constituting the composite and it can be seen that there is a radiation attenuation effect due to the structure of the composite material.
From this, it is expected that the more complex the structure of the composite material, the greater the difference in the linear attenuation coefficient between the materials constituting the composite material, the greater the refractive attenuation effect due to the composite structure.
Therefore, in the case of radioactive cesium adsorption nonwoven fabric used for the purpose of removing radioactive cesium from radioactive contaminated water or contaminated soil, it is expected that the attenuation effect due to the structure of the adsorption nonwoven fabric can be expected.
Finally, the gamma ray blocking effect of the 4cm thickness nonwoven fabric containing 30% Prussian blue, where the adsorbed cesium ions are located in the center of the nonwoven fabric and whose pores occupy half of the volume of the nonwoven fabric, was found to be more than 50%.
From this fact, it is believed that the cesium adsorbing nonwoven fabric has such a shielding ability that it can partially weaken the intensity of the emitted radiation, thus expanding its applicability as a material for adsorption and separation of radioactive waste.
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Dr. George R. Koerner Director of the Geosynthetic Institute, United States
George R. Koerner is Director of the Geosynthetic Institute. He is in charge of laboratory accreditation, field certification and continuing education at the Institute. He also manages several research projects and has published over 300 technical papers in his 35-year association with polymers used in below ground construction. Dr. Koerner’s Ph.D. is from Drexel University in Geotechnical Engineering. He is a registered professional engineer and a certified quality auditor. George has received many awards over the years. The most notable being IFAI’s Environmental Technologies Award of Excellence 1995, ASCE’s Geotechnical Engineer of the year in 2004, the title of ASTM Fellow in 2013, GMA’s first Koerner lecturer in 2017 and the title of ASCE Fellow in 2020.
Speech Title: Geosynthetic Market Penetration after Four Decades
Abstract:This presentation will illustrate the growth of geosynthetics over the past four decades by functional category. The first text book on this subject was “Designing with Geosynthetics” by Robert M. Koerner published in the 1980s. Using this as a starting point, we will track the evolution of geosynthetic through the 2020’s and the publication of the “IGS Geosynthetic Handbook” edited by George R. Koerner.
Geosynthetics are polymeric products, which are used in connection with soil, rock or other soil-like materials to fulfill various functions in geotechnical engineering. Geosynthetics are of ever-growing importance in the construction industry. The 2023 ISO/TC 221 “IGS Strategic Business Plan” reports that the geosynthetic market worldwide is approaching ten billion US dollars annually.
Geosynthetics can be characterized by the following eleven functions.
1. Filtration - a porous media through which fluid is passed to separate out matter in suspension.
2. Drainage - the action or process of removing by transmission, surplus fluid from a system.
3. Separation- the action or state of moving or keeping apart.
4. Barrier- are obstacles that prevent movement or access. Geosynthetic barriers are used to control fluid migration in manmade systems.
5. Reinforcement - the action or process of strengthening to provide additional stability in construction.
6. Stress Relief- involves dissipating stresses in a material by reflection, absorption and attenuation.
7. Protection - denotes the relative resistance or ability of a material to inhibit the intrusion of a foreign object.
8. Stabilization - the process of making something physically more secure or stable making it unlikely to change, fail, or decline.
9. Erosion Control - the practice of preventing or controlling wind or water movement of soil in the environment.
10. Insulation - is the action of separating a conductor from conducting bodies by means of nonconductors so as to prevent transfer of electricity, heat, energy or sound.
11. Appurtenances - an accessory, fastener or other item associated with connecting geosynthetics to a variety of other construction materials.
We will give an overview of the various geosynthetic products and the application in which they are used. The various functions, which geosynthetics may fulfill are examined with case studies. The geosynthetic market is evaluated as well as the socioeconomic benefits will be discussed.
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