Search Results - "Ahn, Jonghoon"

Ultrasensitive torque detection with an optically levitated nanorotor by Ahn, Jonghoon, Xu, Zhujing, Bang, Jaehoon, Ju, Peng, Gao, Xingyu, Li, Tongcang

“…Torque sensors such as the torsion balance enabled the first determination of the gravitational constant by Henri Cavendish 1 and the discovery of Coulomb’s…”
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Torsional Optomechanics of a Levitated Nonspherical Nanoparticle by Hoang, Thai M, Ma, Yue, Ahn, Jonghoon, Bang, Jaehoon, Robicheaux, F, Yin, Zhang-Qi, Li, Tongcang

“…An optically levitated nanoparticle in vacuum is a paradigm optomechanical system for sensing and studying macroscopic quantum mechanics. While its…”
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Optically Levitated Nanodumbbell Torsion Balance and GHz Nanomechanical Rotor by Ahn, Jonghoon, Xu, Zhujing, Bang, Jaehoon, Deng, Yu-Hao, Hoang, Thai M, Han, Qinkai, Ma, Ren-Min, Li, Tongcang

“…Levitated optomechanics has great potential in precision measurements, thermodynamics, macroscopic quantum mechanics, and quantum sensing. Here we synthesize…”
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Electron spin control of optically levitated nanodiamonds in vacuum by Hoang, Thai M., Ahn, Jonghoon, Bang, Jaehoon, Li, Tongcang

“…Electron spins of diamond nitrogen-vacancy (NV) centres are important quantum resources for nanoscale sensing and quantum information. Combining NV spins with…”
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Experimental Test of the Differential Fluctuation Theorem and a Generalized Jarzynski Equality for Arbitrary Initial States by Hoang, Thai M, Pan, Rui, Ahn, Jonghoon, Bang, Jaehoon, Quan, H T, Li, Tongcang

“…Nonequilibrium processes of small systems such as molecular machines are ubiquitous in biology, chemistry, and physics but are often challenging to comprehend…”
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Femtosecond Laser Writing of Spin Defects in Hexagonal Boron Nitride by Gao, Xingyu, Pandey, Siddhant, Kianinia, Mehran, Ahn, Jonghoon, Ju, Peng, Aharonovich, Igor, Shivaram, Niranjan, Li, Tongcang

“…Optically active spin defects in wide-bandgap materials have many potential applications in quantum information and quantum sensing. Spin defects in…”
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Comparative Analysis of Energy Use and Human Comfort by an Intelligent Control Model at the Change of Season by Yoon, Sung Hoon, Ahn, Jonghoon

“…For improving control methods in the thermal environment, various algorithms have been studied to satisfy the specific conditions required by the…”
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Building Space Thermal Control Model Responding to Sharp Changes in Outdoor Temperature by Kim, Sangchul, Ahn, Jonghoon

“…As computing and data-driven technologies have improved, the precision of the building thermal control models has been gradually improved, but the use of…”
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Five-dimensional cooling and nonlinear dynamics of an optically levitated nanodumbbell by Bang, Jaehoon, Seberson, T., Ju, Peng, Ahn, Jonghoon, Xu, Zhujing, Gao, Xingyu, Robicheaux, F., Li, Tongcang

“…Optically levitated nonspherical particles in vacuum are excellent candidates for torque sensing, rotational quantum mechanics, high-frequency gravitational…”
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Comparative Analyses of Energy Efficiency between on-Demand and Predictive Controls for Buildings’ Indoor Thermal Environment by Sung, Lee-Yong, Ahn, Jonghoon

“…Advanced thermal control technologies have been continuously developed to complement conventional models and algorithms to improve their performance regarding…”
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Experimental realization of Feynman's ratchet by Bang, Jaehoon, Pan, Rui, Hoang, Thai M, Ahn, Jonghoon, Jarzynski, Christopher, Quan, H T, Li, Tongcang

“…Feynman's ratchet is a microscopic machine in contact with two heat reservoirs, at temperatures TA and TB, that was proposed by Richard Feynman to illustrate…”
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Anti-logic or common sense that can hinder machine’s energy performance: Energy and comfort control models based on artificial intelligence responding to abnormal indoor environments by Ahn, Jonghoon, Cho, Soolyeon

“…•Integrated energy control model improves thermal comfort and mitigates an increase of energy consumption.•Communication between heating and cooling, thermal…”
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Development of an intelligent building controller to mitigate indoor thermal dissatisfaction and peak energy demands in a district heating system by Ahn, Jonghoon, Cho, Soolyeon

“…District heating systems were gradually improved with the development of generation, storage, distribution technologies, and the demands continued to expand…”
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Analysis of energy and control efficiencies of fuzzy logic and artificial neural network technologies in the heating energy supply system responding to the changes of user demands by Ahn, Jonghoon, Cho, Soolyeon, Chung, Dae Hun

“…•Advanced controllers are proposed to reduce control errors and energy consumption increases.•The FIS and ANN models are utilized to compare conventional…”
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Improving sustainability of ever-changing building spaces affected by users’ fickle taste: A focus on human comfort and energy use by Moon, Jin Woo, Ahn, Jonghoon

“…•A network-based model is proposed to improve indoor thermal comfort and energy efficiency in buildings.•Deterministic control strategies examine user's…”
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Development of a statistical analysis model to benchmark the energy use intensity of subway stations by Ahn, Jonghoon, Cho, Soolyeon, Chung, Dae Hun

“…•A multiple regression model for energy benchmarking subway stations is proposed.•Actual measured and simulation data are utilized to validate the…”
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Improving the quality of building spaces that are planned mainly on loads rather than residents: Human comfort and energy savings for warehouses by Park, Sung-yong, Cho, Soolyeon, Ahn, Jonghoon

“…•A study on building spaces emphasizing work efficiency only is proposed to improve both thermal comfort and energy efficiency.•New strategies are required to…”
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Dead-band vs. machine-learning control systems: Analysis of control benefits and energy efficiency by Ahn, Jonghoon, Cho, Soolyeon

“…In residential and commercial buildings, thermostat controllers have been typically utilized to maintain room temperature near desired set-point. Recently,…”
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Energy cost analysis of an intelligent building network adopting heat trading concept in a district heating model by Ahn, Jonghoon, Chung, Dae Hun, Cho, Soolyeon

“…With the help of advanced technologies, district heating systems were gradually improved to increase fuel use efficiency and reduce environmental impacts…”
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Optically Levitated Torque Sensor and Ultrafast Nanomechanical Rotor by Tongcang Li, Jonghoon Ahn, Zhujing Xu, Jaehoon Bang

“…We propose to optically levitate a nonspherical nanoparticle in vacuum to detect the quantum vacuum torque (Casimir torque). We have levitated nonspherical…”
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