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A remotely steerable Janus micromotor adsorbent for the active remediation of Cs-contaminated water
Hwang, Juri,Yang, Hee-Man,Lee, Kune-Woo,Jung, Yang-Il,Lee, Kyung Jin,Park, Chan Woo Elsevier 2019 Journal of hazardous materials Vol.369 No.-
<P><B>Abstract</B></P> <P>We report the development of magnetically steerable self-propelled micromotors that selectively remove radioactive Cs from contaminated water. Mesoporous silica microspheres were functionalized with the highly Cs-selective copper ferrocyanide, and half of the adsorptive particle surface was then coated with ferromagnetic Ni and catalytic Pt layers to fabricate Janus micromotors. The micromotor adsorbent displayed random propulsion in an H<SUB>2</SUB>O<SUB>2</SUB> solution via catalytic bubble evolution from the Pt surface, and the micromotor adsorbent self-propulsion resulted in an 8-fold higher Cs removal compared to the stationary adsorbent within one hour. The ferromagnetism of the Ni layer allowed the micromotor adsorbent to be magnetically and remotely steerable, and the propulsion speed under a magnetic field was ˜11-fold greater than it was in the absence of the magnetophoretic force. The adsorption of Cs by the self-propelling micromotor adsorbent and the subsequent magnetic recovery of the adsorbent enabled the successful removal of radioactive <SUP>137</SUP>Cs from aqueous solutions. More than 98% of the radioactive <SUP>137</SUP>Cs ions were removed from solution, even in the presence of competing ions, such as Na<SUP>+</SUP> (1000 ppm).</P> <P><B>Highlights</B></P> <P> <UL> <LI> Self-propelled micromotor adsorbent was developed for selective adsorption of radioactive Cs. </LI> <LI> The random movement of the micromotor adsorbent significantly reduced the Cs cleanup time. </LI> <LI> The micromotor adsorbent was remotely steerable and collectable using a magnetic field. </LI> <LI> More than 98% of the radioactive <SUP>137</SUP>Cs ions were removed from solution containing competing ions. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Juri Lee,Hyung Gu Park,In Seong Kim,YoungGun Pu,Keum Cheol Hwang,Youngoo Yang,Kang-Yoon Lee,Munkyo Seo 대한전자공학회 2015 Journal of semiconductor technology and science Vol.15 No.1
This paper presents a 6 Gb/s 4-channel arrayed transimpedance amplifiers (TIA) with the gain control for 4-channel passive optical network in 0.13 ㎜ complementary metal oxide semiconductor (CMOS) technology. A regulated cascode input stage and inductive-series peaking are proposed in order to increase the bandwidth. Also, a variable gain control is implemented to provide flexibility to the overall system. The TIA has a maximum 98.1 ㏈Ω gain and an input current noise level of about 37.8 ㎀/㎐. The die area of the fabricated TIA is 1.9 ㎜ x 2.2 ㎜ for 4-channel. The power dissipation is 47.64 ㎽/1ch.
Lee, Juri,Park, Hyung Gu,Kim, In Seong,Pu, YoungGun,Hwang, Keum Cheol,Yang, Youngoo,Lee, Kang-Yoon,Seo, Munkyo The Institute of Electronics and Information Engin 2015 Journal of semiconductor technology and science Vol.15 No.1
This paper presents a 6 Gb/s 4-channel arrayed transimpedance amplifiers (TIA) with the gain control for 4-channel passive optical network in $0.13{\mu}m$ complementary metal oxide semiconductor (CMOS) technology. A regulated cascode input stage and inductive-series peaking are proposed in order to increase the bandwidth. Also, a variable gain control is implemented to provide flexibility to the overall system. The TIA has a maximum $98.1dB{\Omega}$ gain and an input current noise level of about 37.8 pA/Hz. The die area of the fabricated TIA is $1.9mm{\times}2.2mm$ for 4-channel. The power dissipation is 47.64 mW/1ch.
Ma, Juri,Lee, Kwangmin,Ban, Jaesam,Son, Hyeju,Koh, Jeongtae,Hwang, Gabwoon,Kim, Hyunseung,Lee, Kyungku,Vang, Mongsook,Yang, Hongso,Lim, Hyunpil,Oh, Gyejeong,Park, Sangwon,Yun, Kwidug American Scientific Publishers 2013 Journal of Nanoscience and Nanotechnology Vol.13 No.6
<P>An effective loading method of the recombinant human Bone Morphogenetic Protein-2 (rhBMP-2) on the implant surface is essential for promoting bone formation. However, the studies comparing the effectiveness of loading methods for rhBMP-2 are insufficient. The objective of this study was to investigate the sustained rhBMP-2 delivery on the functionalized nanotubular surface. rhBMP-2 loading method on functionalized nanotubular surface was divided into 3 groups; coating and dry method, vacuum method, lyophilization method. A total of 10 ug rhBMP-2 was loaded into functionalized nanotubular titanium implant surfaces (3.75 mm in diameter and 7 mm in length). The releasing time of rhBMP-2 was evaluated at 1, 5, 7 days. The data were statistically analyzed with one-way ANOVA and a Post Hoc Bonferroni test. A sustained release pattern was observed in each groups and the amount of rhBMP-2 loaded was the highest in the lyophilization group. The results suggest that lyophilization method is effective method to load rhBMP-2 on the functionalized nanotubular surface and the functionalized nanotubular surface could be a sustainable useful carrier of rhBMP-2.</P>
DongSoo Lee,Juri Lee,Hyung-Gu Park,JinWook Choi,SangHyeon Park,InSeong Kim,YoungGun Pu,JaeYoung Kim,Keum Cheol Hwang,Youngoo Yang,Munkyo Seo,Kang-Yoon Lee 대한전자공학회 2016 Journal of semiconductor technology and science Vol.16 No.1
This paper presents a wide-frequencyrange, low-power transceiver with an automatic impedance-matching calibration for TV-white-space (TVWS) application. The wide-range automatic impedance matching calibration (AIMC) is proposed for the Drive Amplifier (DA) and LNA. The optimal S22 and S11 matching capacitances are selected in the DA and LNA, respectively. Also, the Single Pole Double Throw (SPDT) switch is integrated to share the antenna and matching network between the transmitter and receiver, thereby minimizing the systemic cost. An N-path filter is proposed to reject the large interferers in the TVWS frequency band. The current-driven mixer with a 25% duty LO generator is designed to achieve the high-gain and low-noise figures; also, the frequency synthesizer is designed to generate the wide-range LO signals, and it is used to implement the FSK modulation with a programmable loop bandwidth for multi-rate communication. The TVWS transceiver is implemented in 0.13 μm, 1-poly, 6-metal CMOS technology. The die area of the transceiver is 4 mm x 3 mm. The power consumption levels of the transmitter and receiver are 64.35 mW and 39.8 mW, respectively, when the output-power level of the transmitter is +10 dBm at a supply voltage of 3.3 V. The phase noise of the PLL output at Band 2 is -128.3 dBc/Hz with a 1 MHz offset.
Sunghun Cho,DongSoo Lee,Juri Lee,Hyung-Gu Park,YoungGun Pu,Sang-Sun Yoo,Keum Cheol Hwang,Youngoo Yang,Cheon-Seok Park,Kang?Yoon Lee 대한전자공학회 2016 Journal of semiconductor technology and science Vol.16 No.3
This paper presents a 4-channel multi-rate vertical-cavity surface-emitting laser (VCSEL) driver. In order to keep the output power constant with respect to the process, voltage, temperature (PVT) variations, this research proposes automatic power and magnitude. For the fast settling time, the high-speed 10-bit time-interleaved Flash-successive approximation analog to digital converter (Flash-SAR ADC) is proposed and shared for automatic power and magnitude calibration to reduce the die area and power consumption. This chip is fabricated using 0.13-μm CMOS technology and the die area is 4.2 mm². The power consumption is 117.84 mW per channel from a 3.3 V supply voltage at 10 Gbps. The measured resolution of bias /modulation current for APC/AMC is 0.015 mA.
Lee, DongSoo,Lee, Juri,Park, Hyung-Gu,Choi, JinWook,Park, SangHyeon,Kim, InSeong,Pu, YoungGun,Kim, JaeYoung,Hwang, Keum Cheol,Yang, Youngoo,Seo, Munkyo,Lee, Kang-Yoon The Institute of Electronics and Information Engin 2016 Journal of semiconductor technology and science Vol.16 No.1
This paper presents a wide-frequency-range, low-power transceiver with an automatic impedance-matching calibration for TV-white-space (TVWS) application. The wide-range automatic impedance matching calibration (AIMC) is proposed for the Drive Amplifier (DA) and LNA. The optimal $S_{22}$ and $S_{11}$ matching capacitances are selected in the DA and LNA, respectively. Also, the Single Pole Double Throw (SPDT) switch is integrated to share the antenna and matching network between the transmitter and receiver, thereby minimizing the systemic cost. An N-path filter is proposed to reject the large interferers in the TVWS frequency band. The current-driven mixer with a 25% duty LO generator is designed to achieve the high-gain and low-noise figures; also, the frequency synthesizer is designed to generate the wide-range LO signals, and it is used to implement the FSK modulation with a programmable loop bandwidth for multi-rate communication. The TVWS transceiver is implemented in $0.13{\mu}m$, 1-poly, 6-metal CMOS technology. The die area of the transceiver is $4mm{\times}3mm$. The power consumption levels of the transmitter and receiver are 64.35 mW and 39.8 mW, respectively, when the output-power level of the transmitter is +10 dBm at a supply voltage of 3.3 V. The phase noise of the PLL output at Band 2 is -128.3 dBc/Hz with a 1 MHz offset.
Lee Jin Hyung,Hwang Hyunchan,Yun Juri,Kim Hee Jun,Yoo Seo-Koo,Chung Un Sun,Han Doug Hyun 대한의학회 2023 Journal of Korean medical science Vol.38 No.29
Background: Music is regarded as a beneficial tool for assessing the clinical symptoms and communication skills in individuals with autism spectrum disorder (ASD) or autism. The present study developed a music-based attention test (MAT) for individuals with autism using music parameters and the algorithm of the comprehensive attention test (CAT). Methods: We recruited 51 autistic individuals and 50 neurotypical individuals to participate in the CAT, MAT, and social intelligence tests. The reliability and validity of the MAT were assessed using exploratory factor analysis, concurrent validity, and criterion-related validity. Results: The MAT had sound internal consistency (high Cronbach’s α = 0.948). In addition, the MAT had suitable concurrent validity in the correlation between CAT and MAT, as well as good criterion validity when attention was measured using the MAT and was compared between autistic individuals and neurotypical individuals. Attention evaluated using the MAT was associated with the social quotient in individuals with autism. Conclusions: The MAT could be a relevant tool for gauging attention in individuals with ASD. Furthermore, attention determined using the MAT may be correlated with social quotient in autistic individuals. Future studies should consider that using music in the field of attention could improve the social quotient of individuals with autism.