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| 1 | Predicting the Rainfall-Triggered Landslides in a Forested Mountain Region Using TRIGRS Model显示文摘Landslides are natural disasters which can pose a serious threat to human and property in many areas around the world. The Transient Rainfall Infiltration and Grid-based Regional Slope-stability (TRIGRS) model was used to investigate the rainfall-induced shallow landslides in a forested mountain region, Korea. Various input data for TRIGRS model include time-varying rainfall, topographic characteristics, soil depth, material strength, and hydraulic properties. A series of calculations were conducted in determining the slope stability over the Jangheung region in Korea during the storm occurred on August 6, 1998. The results show that TRIGRS model captured about 64.1% of landslides that were extracted from the IKONOS2 imageries. The model demonstrated how the factor of safety changed with time during a storm considering both the transient and spatial responses of pore water pressure in its slope stability calculation. | Dongyeob KIM Sangjun IM Sang Ho LEE Youngjoo HONG Kyung-Sub CHA | 2010 | Journal of Mountain Science2010，7，1： | 10 |
| 2 | Assessing the impacts of land use changes on watershed hydrology using MIKE SHE显示文摘 | Sangjun Im Hyeonjun Kim Chulgyum Kim | | 0，，： | 1 |
| 3 | Robust SOI Process without Footing and Its Application to Ultra High-Performmlce Micro- gyroscopes显示文摘 | Jongpal Kim Sangjun Park Donghun Kwak | 2004 | Sens Actuators A2004，114，： | 1 |
| 4 | An x-Axis Single-Crystalline Silicon Microgyroscope Fabricated by the Extended SBM Process显示文摘 | Jongpal Kim Sangjun Park Donghun Kwak | 2005 | J-MEMS2005，14，： | 1 |
| 5 | Real-time porosity reduction during metal directed energy deposition using a pulse laser显示文摘Porosity is a challenging issue in additive manufacturing and is detrimental to the quality of the additively manufactured products.In this study,a real-time porosity reduction technique was developed by incorporating a pulse laser into a laser metal powder directed energy deposition(DED)system.The incorporated pulse laser can accelerate fluid flow within the melt pool and facilitate the escape of pores before complete solidification.It achieves this real-time porosity reduction by inducing accelerated and turbulent Marangoni flow,ultrasonic waves,and shock waves into the melt pool.The uniqueness and advantages of the proposed technique include the following:(1)For a laser metal powder DED process,this study proposed a noncontact,nondestructive,and real-time porosity reduction technique at the melt pool level.(2)It was experimentally and numerically validated that the developed technique did not alter the geometry and the grain structure of the manufactured Ti-6Al-4V samples.(3)Because the porosity reduction is accomplished at the melt pool level,its application is not limited by the size,shape,or complexity of the printing target.(4)The developed technique can be readily incorporated into the existing DED systems without any modification of the original tool-path design.The experimental results showed that the pore volume fraction decreased from 0.132%to 0.005%,no pores larger than 6×10^(4)μm^(3) were observed,and a 91%reduction in the total pore number was achieved when the pulse laser energy reached 11.5 mJ. | Hoon Sohn Peipei Liu Hansol Yoon Kiyoon Yi Liu Yang Sangjun Kim | 2022 | Journal of Materials Science & Technology2022，，21： | 0 |
| 6 | Formation of sub-100-nm suspended nanowires with various materials using thermally adjusted electrospun nanofibers as templates显示文摘The air suspension and location specification properties of nanowires are crucial factors for optimizing nanowires in electronic devices and suppressing undesirable interactions with substrates.Although various strategies have been proposed to fabricate suspended nanowires,placing a nanowire in desired microstructures without material constraints or high-temperature processes remains a challenge.In this study,suspended nanowires were formed using a thermally aggregated electrospun polymer as a template.An elaborately designed microstructure enables an electrospun fiber template to be formed at the desired location during thermal treatment.Moreover,the desired thickness of the nanowires is easily controlled with the electrospun fiber templates,resulting in the parallel formation of suspended nanowires that are less than 100 nm thick.Furthermore,this approach facilitates the formation of suspended nanowires with various materials.This is accomplished by evaporating various materials onto the electrospun fiber template and by removing the template.Palladium,copper,tungsten oxide(WO3),and tin oxide nanowires are formed as examples to demonstrate the advantage of this approach in terms of nanowire material selection.Hydrogen(H2)and nitrogen dioxide(NO2)gas sensors comprising palladium and tungsten oxide,respectively,are demonstrated as exemplary devices of the proposed method. | Yongkeun Oh Dae-Sung Kwon Eunhwan Jo Yunsung Kang Sangjun Sim Jongbaeg Kim | 2023 | Microsystems & Nanoengineering2023，9，1： | 0 |
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