Hyung Keun Lee

Korea Aerospace University

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Pravin G. Ingole

North East Institute of Science and Technology

Won Kil Choi

Korea Institute of Energy Research

Jae-Deok Jeon

Korea Institute of Energy Research

Kwang Ho Choi

Pusan National University Yangsan Hospital

La Woo Kim

Korea Aerospace University

Won Jae Yoo

Korea Aerospace University

Yu Dam Lee

Korea Aerospace University

Hee Sung Kim

Gyeongsang National University

JoonHoo Lim

Korea Aerospace University

Muhammad Irshad Baig

University of Twente

Cooperative Institutions

Korea Institute of Energy Research

Government of the Republic of Korea

Seoul National University

Yonsei University

Korea Aerospace University

Daejeon University

Korea University

Korea University of Science and Technology

Korea Advanced Institute of Science and Technology

Chungnam National University

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Influence of nitrogen/phosphorus-doped carbon dots on polyamide thin film membranes for water vapor/N₂ mixture gas separation

RSC Advances (2019)

Yogita M. Shirke Ali M. Abou-Elanwar Won-Kil Choi Hyojin Lee Seong Uk Hong

Nanoparticles have been attracting attention because they can significantly improve the performance of membranes when added in small amounts. In this study, the effect of polyamide membranes incorporating hydrophilic nitrogen/phosphorus-doped carbon dots (NP-CDs) to enhance water vapor/N2 separation has been investigated. NP-CD nanoparticles with many hydrophilic functional groups are synthesized from chitosan by a one-pot green method and introduced to the surface of the polysulfone (PSf) substrates by interfacial polymerization reaction. The mean particle diameter of NP-CDs, estimated from transmission electron microscopy images, is 2.6 nm. By adding NP-CDs (0-1.5 wt%) to the polyamide layer, the contact angles of the membranes dramatically decreased from 65° (PSf) to <9° (thin film nanocomposite (TFN)), which means that the TFN membranes become significantly hydrophilic. From the water vapor separation results, the addition of NP-CDs in the polyamide layer improves the water vapor permeance from 1511 (thin film composite (TFC) without nanoparticles) to 2448 GPU (TFN with 1.0 wt% NP-CD loading, CD-TFN(1.0)) and the water vapor/N2 selectivity from 73 (TFC) to 854 (CD-TFN(1.0)). To our knowledge, this is the first study of highly functionalized NP-CD-incorporated polyamide membranes to enhance water vapor separation.

Permeance

Interfacial polymerization

Polysulfone

Carbon fibers

10.1039/c9ra06300e

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Citations (18)

Synthesis and characterization of polyamide/polyester thin-film nanocomposite membranes achieved by functionalized TiO₂ nanoparticles for water vapor separation

Journal of Materials Chemistry A (2016)

Pravin G. Ingole Muhammad Irshad Baig Won Kil Choi Hyung Keun Lee

In this study, we report the synthesis of thin film nanocomposite (TFN) membranes by interfacial polymerization (IP) on porous polysulfone (PSf) hollow fiber membrane supports.

Characterization

10.1039/c6ta00100a

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Citations (78)

Tightly-Coupled GPS/INS/Ultrasonic-Speedometer/Barometer Integrated Positioning for GPS-Denied Environments

Journal of Positioning Navigation and Timing (2020)

Bu-Sung Choi Won-Jae Yoo La Woo Kim Yu Dam Lee Hyung Keun Lee

Barometer

GPS disciplined oscillator

10.11003/jpnt.2020.9.4.387

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Citations (0)

Synthesis of superhydrophilic Nafion based nanocomposite hollow fiber membranes for water vapor separation

Process Safety and Environmental Protection (2017)

Pravin G. Ingole Muhammad Irshad Baig Wook Choi Xinghai An Won Kil Choi

Permeance

Polysulfone

Nafion

10.1016/j.cherd.2017.09.003

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Citations (26)

Estimation of Angular Acceleration By a Monocular Vision Sensor

Journal of Positioning Navigation and Timing (2014)

JoonHoo Lim Hee Sung Kim Je Young Lee Kwang Ho Choi Sung Jin Kang

Recently, monitoring of two-body ground vehicles carrying extremely hazardous materials has been considered as one of the most important national issues. This issue induces large cost in terms of national economy and social benefit. To monitor and counteract accidents promptly, an efficient methodology is required. For accident monitoring, GPS can be utilized in most cases. However, it is widely known that GPS cannot provide sufficient continuity in urban cannons and tunnels. To complement the weakness of GPS, this paper proposes an accident monitoring method based on a monocular vision sensor. The proposed method estimates angular acceleration from a sequence of image frames captured by a monocular vision sensor. The possibility of using angular acceleration is investigated to determine the occurrence of accidents such as jackknifing and rollover. By an experiment based on actual measurements, the feasibility of the proposed method is evaluated.

Monocular vision

Monocular

Angular acceleration

10.11003/jpnt.2014.3.1.001

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Citations (0)

Feasibility of Integrated GNSS/OBD-II/IMU as a Prerequisite for Virtual Reality

Communications in computer and information science (2017)

Jung-Hwan Lim Kwang Ho Choi Won Jae Yoo L. Kim Y. Lee

10.1007/978-3-319-58753-0_8

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Citations (1)

Experimental investigation and simulation of hollow fiber membrane process for SF₆ recovery from GIS

Polymers for Advanced Technologies (2013)

Kee Hong Kim Pravin G. Ingole Jong Hak Kim Hyung Keun Lee

In this present study, polyethersulfone hollow fiber membrane was used to recover sulfur hexafluoride (SF 6 ) from gas‐insulated switchgear (GIS). SF 6 , N 2 pure gas and mixed gas (12.5 vol.% of SF 6 ) experiment was initiated to observe permeation behavior according to temperature and pressure difference and retentate flow rate. Scanning electron microscopy was used to investigate the morphological characteristics and the structure of asymmetric hollow fibers. The permeation rates of SF 6 and N 2 were measured by the variable pressure method. As a result, permeance of N 2 was 9.5–16.3 GPU, and selectivity of N 2 /SF 6 was 10.5–13.3. Moreover, the concentration of SF 6 in the retentate stream reached to 99.2% by the control of the operating condition. Based on the experimental results, tree‐stage membrane process was designed using simulation program. As a result, demanded membrane area reduced about 74% according to operating condition difference. Copyright © 2013 John Wiley & Sons, Ltd.

Permeance

Sulfur hexafluoride

Switchgear

Hollow fiber membrane

10.1002/pat.3175

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Citations (16)

Development of carboxylated TiO2 incorporated thin film nanocomposite hollow fiber membranes for flue gas dehydration

Journal of Membrane Science (2016)

Muhammad Irshad Baig Pravin G. Ingole Won Kil Choi Seong Ryong Park Eun Chul Kang

Permeance

Polysulfone