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Development of an Indoor Positioning System for Greenhouse Flying Robot
( Ming-jhe He ),( Suming Chen ),( Chao-yin Tsai ),( Chieh-yu Lin ) 한국농업기계학회 2018 한국농업기계학회 학술발표논문집 Vol.23 No.1
Precision cultivation is a new trend in agricultural production nowadays. The current greenhouse cultivation only uses a few of sensors to represent the overall state of the greenhouse. That couldn’t get the entire environmental conditions of greenhouse and make it difficult to implement precise cultivation in greenhouse. To utilize a quadrotor equipped with sensors to collect the environmental information in greenhouse; and locating the quadrotor is the primary task. Since the Global Positioning System cannot be used in the greenhouse, an indoor-positioning system to locate the quadrotor has to be studied. Lin (2017) has developed an indoor-positioning system which is based on UWB (Ultra-Wideband) technology but has not been able to extend to whole greenhouse. In this study, the number of anchors was increased by SPI (Serial Peripheral Interface bus) technology to extend the UWB indoor-positioning system to whole greenhouse. At present, the error of the absolute distance in the indoor positioning system is about 0.08 m. In the flight test, the quadrotor could fly on the scheduled paths and collect the environmental information.
Coherent control of 171Yb+ ion qubit states and thermometry using motional decoherence
Jeon Honggi,Park Nojun,Yu Jiyong,Kwon Yeong-Dae,염다현,Jhe Wonho 한국물리학회 2021 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.78 No.4
171Yb+ions were trapped in a quadrupole ion trap. A mode-locked pulse laser at 355 nm was used to generate a frequency comb to drive a Raman transition between the ground hyperfine qubit states of the Doppler cooled ion. Qubit transitions were driven in co-propagating and counter propagating laser beam geometries. In the co-propagating geometry, the coherence time and the fidelity of gate operations were obtained. By taking advantage of the phonon number sensitivity of the Rabi frequency in the counter-propagating geometry, we measured the center of mass temperature of the trapped ion near the Doppler limit which can be used for general thermometry in the ion trap experiment.
Scour depth evaluation of a bridge with a complex pier foundation
Kuo-Wei Liao,Yasunori Muto,Jhe-Yu Lin 대한토목학회 2018 KSCE JOURNAL OF CIVIL ENGINEERING Vol.22 No.7
A scour depth prediction formula for a river bridge is established using experimental data in which the effects of the pier, pile-capand pile group are considered. More than 170 experimental data entries, including different pier structural sizes, flow depths and soilcovering depths, are collected and verified by existing formulae, which failed to deliver a promising prediction. A machine learningprediction model was then developed to enhance the accuracy. For application purpose, a sequential quadratic programmingoptimization was adopted to construct an explicit prediction formula. The MAPE was significantly improved from 102.8 to 28.9. Theresults indicate that the proposed formula can simultaneously satisfy the requirements of accuracy and simplicity. The proposedformula has the advantages of being conceptually consistent with observed scour behaviors and provides a solid scour depthprediction, which is an important and critical step in the bridge safety evaluation if floods are considered.
Self-assembled (In1-xMnx)As diluted magnetic semiconductor quantum dots with high Tc
Hee Chang Jeon,Kwang Jo Chung,Kwang Jae Chung,Tae Won Kang,Tae Whan Kim,Young Jun Yu,Wonho Jhe,Se Ahn Song 한국물리학회 2004 Current Applied Physics Vol.4 No.2-4
Self assembled (In1-xMnx)As diluted magnetic semiconductor quantum dots (QDs) were grown on GaAs(1 0 0)substrates by using molecular beam epitaxy with a goal of producing (In1-xMnx)As QDs with a semiconductor phase and a high ferromagnetic transition temperature(Tc). High-resolution transmission electron microscopy measurements showed that crystalline (In0:84-Mn0:16)As QDs were formed on GaAs substrates. Magnetic force microscopy images showed that the formed QDs were symmetric single-domain particles. The magnetization curve as a function of the magnetic field at 5 Kindicated that the (In0:84Mn0:16)As QDs were ferromagnetic, and the magnetization curve as a function of the temperature showed that the Tc was as high as 400 K. These results indicate that (In0:84Mn0:16)As QDs grown on GaAs(1 0 0) substrates hold promise for potential applications in quantum bit devices operating at room temperature.