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4 papers found.
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A GPS Sensing Strategy for Accurate and Energy-Efficient Outdoor-to-Indoor Handover in Seamless Localization Systems

Mobile Information Systems A GPS sensing strategy for accurate and energy-efficient outdoor-to-indoor handover in seamless localization systems Yungeun Kim 0 Songhee Lee 0 Seokjoon Lee 0 Hojung Cha ... received his B.Sc. degree in computer science from Yonsei University in 2008. His research interests include mobile and ubiquitous computing, and smartphone-based localization system. Songhee Lee is an

Modeling of Bond Stress–Slip Relationships of a Strand in Concrete during Steam Curing

The restrained thermal expansion of a pretensioned strand causes thermal prestress loss during steam curing until sufficient bond strength develops. The amount of thermal prestress loss is directly related to the characteristics of the interfacial bond stress–slip relationship at different maturity phases of concrete. For a rational assessment, the bond stress–slip relationship...

Modeling of Compressive Strength Development of High-Early-Strength-Concrete at Different Curing Temperatures

Songhee Lee Ngocchien Nguyen High-early-strength-concrete (HESC) made of Type III cement reaches approximately 50-70 % of its design compressive strength in a day in ambient conditions. Experimental

Optimization of Curing Regimes for Precast Prestressed Members with Early-Strength Concrete

Early-strength-concrete (ESC) made of Type I cement with a high Blaine value of 500 m2/kg reaches approximately 60 % of its compressive strength in 1 day at ambient temperature. Based on the 210 compressive test results, a generalized rate-constant material model was presented to predict the development of compressive strengths of ESC at different equivalent ages (9, 12, 18, 24...