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Development Array Module of Phased Array Radars for Space Debris Monitoring
Andrew Chung,위진우,이성재,하성재 한국산업기술융합학회 2023 산업기술연구논문지 (JITR) Vol.28 No.3
This study examines the results of the array modules corresponding to the transceivers of phased array radars utilized for space debris monitoring. The phased array radar for space debris surveillance examined in this study utilizes the S-band radar frequency and is a digital radar system. However, the transmitter-receiver module is power-consuming and generates heat to satisfy the long distance of the radar. The array modules in this study utilized a common water-elongation path to increase the power supply efficiency such that the full digital radar can be fabricated. The measured characteristics of the single array modules of space debris radar were within an output frequency range of 2.9 to 3.35 GHz and power of at least 56 dBm in 300 µs with a pulse flatness of less than 0.5 dB in this frequency band. The maximum duty of 10% was satisfied. The noise figure of the receiver satisfied the characteristics of at most 3.21 dB.
Effect of Dopamine on a Voltage-Gated Potassium Channel in a Jellyfish Motor Neuron
Chung, Jun-mo,Spencer, Andrew N. 이화여자대학교 생명과학연구소 1996 생명과학연구논문집 Vol.7 No.-
To swimming motor neurons(SMNs)of Polyorchis penicillatus, a hydrozoan medusae, dopamine(DA)acts as an inhibitory neurotransmitter by hyperpolarizing its membrane potential and decreasing its firing rate as well. Such an inhibitory action of DA is caused by an increased pemeability to potassium(K)ions. To investigate whether voltage-gated K channels are directly responsible for the membrane hyperpolarization induced by DA, we employed whole-cell voltage clamp configuration. One μM DA applied to SMNs increased the peak and rear values of voltage-gated K currents by 37 and 54%, respectively, in a reversible manner. Combined with subtraction analysis, this result suggests that the outflux of K ions by DA in SMNs occurs mainly through rectifier-like K channels.
Effect of Dopamine on a Voltage-Gated Potassium Channel in a Jellyfish Motor Neuron
Chung, Jun-Mo,Spencer, Andrew N. Korean Society for Biochemistry and Molecular Biol 1996 Journal of biochemistry and molecular biology Vol.29 No.2
To swimming motor neurons (SMNs) of Polyorchis penicillatus, a hydrozoan medusae, dopamine (DA) acts as an inhibitory neurotransmitter by hyperpolarizing its membrane potential and decreasing its firing rate as well. Such an inhibitory action of DA is caused by an increased permeability to potassium (K) ions. To investigate whether voltage-gated K channels are directly responsible for the membrane hyperpolarization induced by DA, we employed whole-cell voltage clamp configuration. One ${\mu}M$ DA applied to SMNs increased the peak and rear values of voltage-gated K currents by 37 and 54%, respectively, in a reversible manner. Combined with subtraction analysis, this result suggests that the outflux of K ions by DA in SMNs occurs mainly through rectifier-like K channels.
Action of Dopamine as Inhibitory Neuromodulator in Jellyfish Synapse
Chung, Jun-mo,Spencert, Andrew N. Korean Society for Biochemistry and Molecular Biol 1998 Journal of biochemistry and molecular biology Vol.31 No.3
Dopamine (DA) acts on swimming motor neurons (SMNs) of Polyorchis penicillatus as an inhibitory neurotransmitter by hyperpolarizing their membrane potentials, which results from the activation of voltagesensitive potassium channels mediated through a $D_2-type$ receptor. In addition, DA, and not the hyperpolarized membrane potential, directly decreased the input resistance of SMNs by ca. 50% from 1.42 to 0.68 $G{\Omega}$. It strongly indicates that DA can shunt other excitatory synaptic signals onto SMNs where DA usually elicited much greater responses in their neurites than soma. All these evidences suggest that DA may operate in this primitive nervous system in dual modes as an inhibitory neurotransmitter and neuromodulator as well.