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A Systematic Experimental Study on the Group Effect of Dragloads in Pile Foundations
Dong Su,Zhiyao Gao,Waiman Yan,Xiaochao Pang 대한토목학회 2020 KSCE JOURNAL OF CIVIL ENGINEERING Vol.24 No.7
There is a paucity of systematic experimental studies on the group effect of dragloads in pile foundations. This paper reports on a series of 1-g model tests that were conducted on single piles as well as 2 × 2 and 3 × 3 pile groups with various pile spacings to investigate the influence of soil compressibility, pile installation method, pile end constraint, and pile spacing on dragload development in the piles. The results indicate that soil compressibility significantly influences the magnitude of dragloads developed in single piles and piles in a group. However, the effect of soil compressibility on the group effect (a measure of dragload reduction) is negligible. Pile spacing is the most significant factor that influences group effect, followed by the number and position of piles. The group effect can reach 50% for a spacing of 3D (where D denotes pile diameter), but becomes negligible for a spacing of 7D. The influence of pile end constraint and pile installation method on group effect is comparatively insignificant. Although group effects of the suspending piles are marginally lower than those of end-bearing piles under otherwise identical conditions, the dragloads on the suspending piles correspond to tensile forces and are detrimental to concrete piles.
박동수 ( Park¸ Dong-su ) 한국구조물진단유지관리공학회 2009 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.13 No.2
Recently a number of researches about mobile communication with wireless modem have been studied to apply with structural monitoring system. In this study structural monitoring system by mobile communication with wireless modem is applied to power station structure to measure the fluctuation of Crack width. The field application shows that CDMA is useful method for structural health monitoring system which installed long distance away.
박동수 ( Park¸ Dong-su ) 한국구조물진단유지관리공학회 2009 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.13 No.2
Recently a number of researches about mechanical splice have been studied to apply with a large diameter reinforcing bars of spliced sleeves. In this study the structural performance of large diameter reinforcing bars with spliced sleeves in low temperature was evaluated. For the application of nuclear power plant structures, two different types of existing splices with #11, 14 rebars were fabricated and static and dynamic test were performed on the basis of ASME SEC III DIV.2 CC-4330.
Dongsu Park 대한골대사학회 2023 대한골대사학회지 Vol.30 No.3
Dental pulp stem cells (DPSCs) have garnered significant interest in dental research for their unique characteristics and potential in tooth development and regeneration. While there were many studies to define their stem cell-like characteristics and osteogenic differentiation functions that are considered ideal candidates for regenerating damaged dental pulp tissue, how endogenous DPSCs respond to dental pulp injury and supply new dentin-forming cells has not been extensively investigated in vivo. Here, we review the recent progress in identity, function, and regulation of endogenous DPSCs and their clinical potential for pulp injury and regeneration. In addition, we discuss current advances in new mouse models, imaging techniques, and its practical uses and limitations in the analysis of DPSCs in pulp injury and regeneration in vivo.
Dongsu Kim,Gu Seomun,Jongho Yoon,Heejin Cho 대한설비공학회 2022 대한설비공학회 학술발표대회논문집 Vol.2022 No.11
This study develops an optimized HVAC control framework using the whole building energy simulation program (i.e., EnerguPlus) and functional mock-up unit (FMU) in the Python environment. To develop and implement this framwork, a building energy model using EnergyPlus was developed based on the existing test facility. The model was initially validated using measured data (e.g., indoor air temperature comparison) before implementing the co-simulation framework. For the co-simulation framework using EnergyPlus and FMU, there are four (4) steps: 1) a real-time weather file modification by FMU, 2) an optimization process (i.e., GenOpt application) based on one hour ahead prediction weather data, 3) an optimized signal point application to EnergyPlus IDF file, and 4) output extraction from the completed simulation within the functional mock-up interface (FMI) with Python. The weather file modification was performed based on onsite measured and obtained weather data values. This study adopted some weather data from the public weather station API. The GenOpt application was also implemented within the Python environment under a developed GUI automated workflow by modifying the GenOpt source code. The PMV-based control scheme is considered in this study to determine the optimized signal point. Based on such framework development. This study identifies that the co-simulation environment can predict hour-ahead loads by considering optimized thermal comfort and real-time weather data. Such predicted outputs (e.g., thermal loads and setpoints) can be expected to use for further building energy management, such as BEMS, by applying an HVAC control scheme. Additionally, the developed framework techniques will help to be a key solution to implement the digital twins of smart homes and buildings.
Dongsu Heo,Georyong Lee,Eunju Jang,Woonsil Ko J-INSTITUTE 2021 Regulations Vol.6 No.3
Purpose: This study examines the wave energy relationship between the chakra system and aromatherapy and explains that aromatherapy has an organic relationship as a holistic therapy of the chakra system. It is also in-tended to identify the possibility of use as wave medicine through the energy mechanisms of chakra and aroma. Method: For the purposes of this study, we examined the principles of the chakra system and aromatherapy and integrated literature theorem and examination to explore how the two systems interact organically with wave energy. Results: In terms of wave energy, our bodies are energy structures based on chakra and aura as energy sys-tems in addition to physiological and chemical aspects. This energy structure is influencing and influenced by thoughts and emotions and affects the chemical structure and cells of our bodies. Human beings are alive be-cause their vitality flows through the body, which is controlled by an energy center called chakra. Each chakra has a constant motion and resonates with aroma essential oil at a particular frequency. Most healing mechanisms involve the exchange of energy. Chakra acts as an information receiver that draws wave energy directly from the surroundings when the surrounding waves become suitable for each individual s frequency. Aroma is associated with healing applications to the human body depending on the part of extraction off a plant. Plants receive the information energy of the earth and spread it to the world, and humans receive the energy and give the energy of the sky to the earth. Conclusion: These wave energy aspects of chakra systems and aromatherapy can be expected to harmonize with physical, psychological, spiritual balance and are of sufficient value in wave medicine.
Highly Efficient Dual-Switch Hybrid Switching Supply Modulator for Envelope Tracking Power Amplifier
Dongsu Kim,Daehyun Kang,Jooseung Kim,Yunsung Cho,Bumman Kim IEEE 2012 IEEE microwave and wireless components letters Vol.22 No.6
<P>This letter describes a highly efficient dual-switch hybrid switching supply modulator for an envelope tracking power amplifier (PA). The supply modulator has a combined structure of a linear amplifier and a switching amplifier. For an improved efficiency, the switching amplifier employs two buck converters and realizes an adaptive slew rate control of the switching amplifier's current. An implemented envelope tracking PA delivers an efficiency of 39.1% at an output power of 27 dBm for long term evolution signal with 10 MHz channel bandwidth.</P>