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Maintenance of gut microbiome stability for optimum intestinal health in pigs——a review

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Journal of Animal Science and Biotechnology 2023年第3期14卷 853-863页

作者： Santi Devi Upadhaya In ho kim Department of Animal Resource and Science Dankook UniversityNo.29 AnseodongCheonan31116ChoongnamSouth Korea

Pigs are exposed to various challenges such as weaning,environmental stressors,unhealthy diet,diseases and infections during their lifetime which adversely affects the gut *** inability of the pig microbiome to return to the pre-challenge baseline may lead to dysbiosis resulting in the outbreak of ***,the maintenance of gut microbiome diversity,robustness and stability has been influential for optimum intestinal health after *** human and animal researches have focused on more holistic approaches to obtain a robust gut microbiota that provides protection against pathogens and improves the digestive physiology and the immune *** this review,we present an overview of the swine gut microbiota,factors affecting the gut microbiome and the importance of microbial stability in promoting optimal intestinal ***,we discussed the current understanding of nutritional interventions using fibers and pre/probiotics supplementation as non-antibiotic alternatives to maintain microbiota resilience to replace diminished species.

关键词： Microbial diversity Nutritional intervention Perturbation Resilience Swine gut microbiome stability

Exergetical Analysis of Organic Flash Cycle with Two-Phase Expander for Recovery of Finite Thermal Reservoirs

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Journal of Thermal Science 2014年第6期23卷 572-579页

作者： Chul ho Han Kyoung hoon kim Department of Intelligent Mechanical Engineering Kumoh National Institute of TechnologyDaehakro 61GumiGyeongbuk 730-701Korea Department of Mechanical Engineering Kumoh National Institute of TechnologyDaehakro 61GumiGyeongbuk 730-701Korea

In this work exergetical performance analysis is carried out based on the second law of thermodynamics for organic flash cycle(OFC) using a two-phase expander instead of throttle expansion in order to recover efficiently finite thermal *** exergy destructions(anergies) at various components of the system are theoretically investigated as well as the exergy *** show that the anergy of heat exchanger or two-phase expander decreases while the anergy of throttle valve increases with increasing flash temperature,and the exergy efficiency has an optimum value with respect to the flash *** the optimal conditions with respect to the flash temperature,exergy efficiency increases with the heating temperature and the component having the largest exergy destruction varies with the flash temperature or heating temperature.

关键词： organic flash cycle(OFC) low grade heat source exergy anecgy

Improved formaldehyde gas sensing properties of well-controlled Au nanoparticle-decorated In2O3 nanofibers integrated on low power MEMS platform

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Journal of Materials Science & Technology 2020年第3期38卷 56-63页

作者： Dongha Im Donghyun kim Dasol Jeong Woon Ik Park Myoungpyo Chun Joon-shik Park Hyunjung kim Hyunsung Jung Nano Materials&Nano Technology Center Korea Institute of Ceramic Engineering&TechnologyJinju 52851Republic of Korea Department of Mineral Resources and Energy Engineering Chonbuk National UniversityJeonju 54896Republic of Korea Smart Sensor Research Center Korea Electronic Technology InstituteSeongnam 13509Republic of Korea

Approaches for the fabrication of a low power-operable formaldehyde(HCho)gas sensor with high sensitivity and selectivity were performed by the utilization of an effective micro-structured platform with a micro-heater to reach high temperature with low heating power as well as by the integration of indium oxide(In2O3)nanofibers decorated with well-dispersed Au nanoparticles as a sensing *** In2O3 nanofibers with the large specific surface area were prepared by the electrospinning following by calcination *** nanoparticles with the well-controlled size as a catalyst were synthesized on the surface of In2O3 *** Au-decorated In2O3 nanofibers were reliably integrated as sensing materials on the bridge-type micro-platform including micro-heaters and *** micro-platform designed to maintain high temperature with low power consumption was fabricated by a microelectromechanical system(MEMS)*** micro-platform gas sensor consisting with Au-In2O3 nanofibers were fabricated effectively to detect HCho gases with high sensitivity and *** HCho gas sensing behaviors were schematically studied as a function of the gas concentration,the size of the adsorbed Au nanoparticles,the applied power to raise the temperature of a sensing part and the kind of target gases.

关键词： Gold nanoparticle In2O3 nanofiber Formaldehyde Gas sensor Low power Micro-platform

Shear deformable finite beam elements for composite box beams

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Acta Mechanica Sinica 2014年第2期30卷 223-240页

作者： Nam-Il kim Dong-ho Choi Department of Architectural Engineering Sejong University Department of Civil and Environmental Engineering Hanyang University

The shear deformable thin-walled composite beams with closed cross-sections have been developed for coupled flexural, torsional, and buckling analyses. A theoretical model applicable to the thin-walled laminated composite box beams is presented by taking into account all the structural couplings coming from the material anisotropy and the shear deformation effects. The current composite beam includes the transverse shear and the restrained warping induced shear deformation by using the first-order shear deformation beam theory. Seven governing equations are derived for the coupled axial-flexural-torsional-shearing buckling based on the principle of minimum total potential energy. Based on the present analytical model, three different types of finite composite beam elements, namely, linear, quadratic and cubic elements are developed to analyze the flexural, torsional, and buckling problems. In order to demonstrate the accuracy and superiority of the beam theory and the finite beam elements developed by this study,numerical solutions are presented and compared with the results obtained by other researchers and the detailed threedimensional analysis results using the shell elements of ABAQUS. Especially, the influences of the modulus ratio and the simplified assumptions in stress-strain relations on the deflection, twisting angle, and critical buckling loads of composite box beams are investigated.

关键词： Thin-walled Composite box beam Deflection Twisting angle Buckling load Shear deformation

Entransy and Exergy Analyses for Optimizations of Heat-Work Conversion with Carnot Cycle

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Journal of Thermal Science 2016年第3期25卷 242-249页

作者： Chul ho Han Kyoung hoon kim Department of Mechanical System Engineering Kumoh National Institute of Technology Department of Mechanical Engineering Kumoh National Institute of Technology

The concept of entransy has been newly proposed in terms of the analogy between heat and electrical conduction and could bc useful in analyzing and optimizing the heat-work conversion systems. This work presents comparative analyses of entransy and exergy for optimizations of heat-work conversion. The work production and heat transfer processes in Carnot cycle system are investigated with the formulations of exergy destruction, entransy loss, work entransy, entransy dissipation, and cfficiencics for both cases of dumping and non-dumping of used source fluid. The effects of source and condensation temperatures on the system performance arc systematically investigated for optimal condition of producing maximum work or work cntransy.

关键词： entransy exergy heat-work conversion Carnot cycle efficiency

REVIEW 6G and Internet of Things:a survey

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Journal of Management Analytics 2021年第2期8卷 316-332页

作者： Jin ho kim College of Business Lewis UniversityRomeovilleILUSA

The 5G networks which have begun to spread worldwide are expected to contribute to an increase in the use of Internet of Things(IoT)technologies and applications,which require massive connectivity,security,and ultra-low ***,it is known that 5G alone is not sufficient for many IoT devices to exchange various types of data in real *** constraints promote the emergence of 6G technologies which can support higher network capacity,lower latency,and faster data transmission than 5G *** understand the current trends in 6G research and their relation to IoT,this paper introduces the main drivers of 6G technology,describes 6G’s enabling technologies,summarizes current 6G research,and introduces the possible applications of 6G to IoT technologies and service areas.

关键词： 6G Internet of Things IoT terahertz extended reality

Lactic Acid Fermentation from Coffee Ground Waste Hydrolysate by Lactobacillus rhamnosus

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Journal of Renewable Materials 2019年第4期7卷 365-372页

作者： Ja-Ryong Koo Hye Min Park Se Kyung kim Hyun shik Yun Department of Biological Engineering Inha UniversityIncheon 22212Korea Institute of Industrial Biotechnology Inha University Research and Business FoundationIncheon 22212Korea

Lactic acid is an important organic acid that is widely used in the food,pharmaceutical,and cosmetic *** acid was produced from coffee ground waste which contains fermentable sugars and is increasingly generated from our daily dietary *** 114 strains of Lactobacillus species,Lactobacillus rhamnosus ATCC 10863 was selected for the production of lactic acid from coffee ground *** alkali pretreatment and saccharification,cellulose and hemicellulose in coffee ground waste were converted into fermentable *** experiments were conducted at various alkali solution,concentrations,and *** pretreatment with 35 g/L of KOH at 121oC for 60 min,the highest concentration of fermentable sugars was *** optimum concentration of Viscozyme L was 2%when saccharification was proceeded at 55oC for 7 *** productivity of lactic acid fermentation was the highest(0.59 g/L/h)at 100 g of coffee ground waste(1x concentration),whereas the lactic acid concentration was the highest at 600 g of coffee ground waste(6x concentration).As the concentration of coffee ground increased,the lactic acid concentration was also increased,however,the amount was not proportional to the coffee ground waste *** this study,it was found that coffee ground waste could be used as a culture medium for Lactobacillus rhamnosus ATCC 10863 through pretreatment and saccharification for the production of lactic acid.

关键词： Coffee ground waste Lactobacillus rhamnosus lactic acid fermentable sugars saccharification alkali pretreatment

High-temperature Oxidation Behavior of Zircaloy-4 and Zirlo in Steam Ambient

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Journal of Materials Science & Technology 2010年第9期26卷 827-832页

作者： Hyung hoon kim Jun ho kim Jin Young Moon ho Seong Lee Jeong Joo kim Young Suck Chai School of Materials Science and Engineering Kyungpook National University School of Mechanical Engineering Yeungnam University214-1 Dae-dongGyeongsan-si

The oxidation characteristics for Zircaloy-4 and Zirlo in the temperature range of 700-1200°C under steam supply condition were investigated by using a modified thermo-gravimetric *** specimens were oxidized for 3600 s at each temperature and then quenched in a *** oxidation rate constants were measured from the weight gains to evaluate the oxidation behavior in Zircaloy-4 and *** weight gain rates of Zirlo were lower than those of Zircaloy-4,leading to the low rate *** different oxidation behaviors between both cladding materials were considered to be due to the difference in their chemical compositions.

关键词： Zircaloy-4 Zirlo Oxidation

Microstructure and Mechanical Properties of Hyper-eutectic Al-Si Alloys Fabricated by Spray Casting

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Journal of Materials Science & Technology 2008年第1期24卷 48-50页

作者： Min Ryou Chul-Hyun kim Myung-ho kim School of Materials Science and Engineering Inha University 253 Yonghyun-DongNam-GuIncheon 402-751Korea Dong Yang Piston Co. LTD 1050Singil-DongDonwon-GuAnsanKyungki-DoKorea

Microstructure and mechanical properties of hyper-eutectic Al-Si alloy fabricated by spray casting were in- vestigated and then these results were compared with those by squeeze *** spray-cast specimen was found to have finer Si particles （～5μm） compared to the squeeze-cast specimen （10-25μm）.The tensile strength and elongation of the spray-cast specimen are also higher than those of the squeeze cast *** was considered that the increased mechanical properties of the spray-cast specimen were mainly due to finer size of the Si particles distributed in Al matrix.

关键词： Hyper-eutectic Al-Si alloy Squeeze casting Spray casting