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( Junhong Park ),( Jongtae Lee ),( Sunmoon Kim ),( Jeongsoo Kim ),( Gunwoo Kang ) 한국폐기물자원순환학회 2023 I-CIPEC Vol.2012 No.0
Mobile air conditioning (MAC) systems of light-duty vehicles consume the most energy among auxiliary parts. Vehicle CO<sub>2</sub> reduction policies in Korea, US EPA and European Commission include the strategies for vehicle manufacturers to introduce high-efficient MAC technologies by giving CO<sub>2</sub> incentive. One of important parts in the strategies is to set up how to evaluate added CO<sub>2</sub> by MAC operation and how to differentiate advanced high-efficient MAC technologies. In this study, to evaluate CO<sub>2</sub> emission added by MAC operation, four Korean vehicles were tested on chassis dynamometer with various test modes and different load conditions to MAC system. The driving cycles are CVS-75 used in emission certification and fuel consumption tests in Korea, SC03 used in pollutant emission regulation in driving condition of MAC operation in US, NIER modes used in developing vehicle emission factors in Korea and Euro-MAC under development for evaluating CO<sub>2</sub> by MAC in European Union. The test results have shown that the higher efficient MAC technologies add the lower CO<sub>2</sub> emission in all test methods. Considerable reduction of vehicle CO<sub>2</sub> emission in MAC operation would be expected by introducing high-efficient MAC technologies.
Park Goeun,이명로,KANG JIATONG,Park Chulwhan,Min Junhong,Lee Taek 나노기술연구협의회 2022 Nano Convergence Vol.9 No.41
Zika virus is a highly infectious virus that is part of the flavivirus group. Precise diagnosis of the Zika virus is significant issue for controlling a global pandemic after the COVID-19 era. For the first time, we describe a zika virus aptamer-based electrical biosensor for detecting Zika virus in human serum. The electrical biosensor composed of a Zika virus aptamer/MXene nanoparticle heterolayer on Au micro-gap electrode (AuMGE)/print circuit board (PCB) system. The Zika virus aptamer was designed to bind the envelope protein of the Zika virus by systematic evolution of ligands by exponential enrichment (SELEX) technique. The binding affinity of the aptamer was determined by fluorescence. For improving the sensor signal sensitivity, Ti3C2Tx MXene was introduced to surface of Au micro-gap electrode (AuMGE). The immobilization process was confirmed by atomic force microscopy (AFM). The prepared aptamer/MXene immobilized on AuMGE can detect the Zika virus through capacitance change according to the target concentration. The capacitance signal from the biosensor increased linearly according to increment of envelope proteins in the human serum. The limit of detection was determined to 38.14 pM, and target proteins could be detected from 100 pM to 10 μM. Thus, the developed electrical aptabiosensor can be a useful tool for Zika virus detection.
Park Goeun,이명로,KANG JIATONG,Park Chulwhan,Min Junhong,Lee Taek 나노기술연구협의회 2022 Nano Convergence Vol.9 No.49
Zika virus is a highly infectious virus that is part of the flavivirus group. Precise diagnosis of the Zika virus is significant issue for controlling a global pandemic after the COVID-19 era. For the first time, we describe a zika virus aptamerbased electrical biosensor for detecting Zika virus in human serum. The electrical biosensor composed of a Zika virus aptamer/MXene nanoparticle heterolayer on Au micro-gap electrode (AuMGE)/print circuit board (PCB) system. The Zika virus aptamer was designed to bind the envelope protein of the Zika virus by systematic evolution of ligands by exponential enrichment (SELEX) technique. The binding affinity of the aptamer was determined by fluorescence. For improving the sensor signal sensitivity, Ti 3 C 2 T x MXene was introduced to surface of Au micro-gap electrode (AuMGE). The immobilization process was confirmed by atomic force microscopy (AFM). The prepared aptamer/MXene immobilized on AuMGE can detect the Zika virus through capacitance change according to the target concentration. The capacitance signal from the biosensor increased linearly according to increment of envelope proteins in the human serum. The limit of detection was determined to 38.14 pM, and target proteins could be detected from 100 pM to 10 μM. Thus, the developed electrical aptabiosensor can be a useful tool for Zika virus detection.
Determination of effective mass density and modulus for resonant metamaterials.
Park, Jeongwon,Park, Buhm,Kim, Deokman,Park, Junhong American Institute of Physics for the Acoustical S 2012 Journal of the Acoustical Society of America Vol.132 No.4
<P>This work presents a method to determine the effective dynamic properties of resonant metamaterials. The longitudinal vibration of a rod with periodically attached oscillators was predicted using wave propagation analysis. The effective mass density and modulus were determined from the transfer function of vibration responses. Predictions of these effective properties compared favorably with laboratory measurements. While the effective mass density showed significant frequency dependent variation near the natural frequency of the oscillators, the elastic modulus was largely unchanged for the setup considered in this study. The effective mass density became complex-numbered when the spring element of the oscillator was viscoelastic. As the real part of the effective mass density became negative, the propagating wavenumber components disappeared, and vibration transmission through the metamaterial was prohibited. The proposed method provides a consistent approach for evaluating the effective parameters of resonant metamaterials using a small number of vibration measurements.</P>