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  1. Article ; Online: Ambient PM

    Kim, Na Rae / Lee, Hyung Joo

    Environmental research

    2024  Volume 252, Issue Pt 3, Page(s) 119032

    Abstract: Particulate matter with an aerodynamic diameter of ≤2.5 μm ( ... ...

    Abstract Particulate matter with an aerodynamic diameter of ≤2.5 μm (PM
    Language English
    Publishing date 2024-04-27
    Publishing country Netherlands
    Document type Journal Article
    ZDB-ID 205699-9
    ISSN 1096-0953 ; 0013-9351
    ISSN (online) 1096-0953
    ISSN 0013-9351
    DOI 10.1016/j.envres.2024.119032
    Database MEDical Literature Analysis and Retrieval System OnLINE

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    In stock of ZB MED Cologne/Königswinter

    Zs.A 726: Show issues Location:
    Je nach Verfügbarkeit (siehe Angabe bei Bestand)
    bis Jg. 1994: Bestellungen von Artikeln über das Online-Bestellformular
    Jg. 1995 - 2021: Lesesall (1.OG)
    ab Jg. 2022: Lesesaal (EG)

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  2. Article ; Online: Benefits of High Resolution PM

    Lee, Hyung Joo

    Environmental science & technology

    2019  Volume 53, Issue 21, Page(s) 12774–12783

    Abstract: This study estimated annual average ambient fine particulate matter ( ... ...

    Abstract This study estimated annual average ambient fine particulate matter (PM
    MeSH term(s) Aerosols ; Air Pollutants ; Air Pollution ; Environmental Monitoring ; Humans ; Particulate Matter ; San Francisco
    Chemical Substances Aerosols ; Air Pollutants ; Particulate Matter
    Language English
    Publishing date 2019-10-17
    Publishing country United States
    Document type Journal Article
    ISSN 1520-5851
    ISSN (online) 1520-5851
    DOI 10.1021/acs.est.9b03799
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article: Improvement of Near-Infrared Light-Emitting Diodes' Optical Efficiency Using a Broadband Distributed Bragg Reflector with an AlAs Buffer.

    Lee, Hyung-Joo / Park, Jin-Young / Kwac, Lee-Ku / Lee, Jongsu

    Nanomaterials (Basel, Switzerland)

    2024  Volume 14, Issue 4

    Abstract: This study developed an advanced 850 nm centered distributed Bragg reflector (DBR) (broadband DBR) composed of nanomaterial-based multiple structures to improve the optical efficiency of an 850 nm near-infrared light-emitting diode (NIR-LED). A combined ... ...

    Abstract This study developed an advanced 850 nm centered distributed Bragg reflector (DBR) (broadband DBR) composed of nanomaterial-based multiple structures to improve the optical efficiency of an 850 nm near-infrared light-emitting diode (NIR-LED). A combined 850 nm centered broadband DBR was fabricated by growing an 800 nm centered ten-pair DBR on a 900 nm centered ten-pair DBR (denoted as a combined DBR). The combined DBR exhibited a slightly wider peak band than conventional DBRs. Furthermore, the peak band width of the combined DBR significantly increased upon using a reflective AlAs buffer layer that reduced the overlapped reflection. The output power (20.5 mW) of NIR-LED chips using the combined DBR with an AlAs buffer layer exceeded that of a conventional 850 nm centered DBR (14.5 mW) by more than 40%. Results indicated that combining the optical conditions of wavelengths and the AlAs buffer layer effectively strengthened the broadband effect of the DBR and increased the optical efficiency of the 850 nm NIR-LED.
    Language English
    Publishing date 2024-02-12
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2662255-5
    ISSN 2079-4991
    ISSN 2079-4991
    DOI 10.3390/nano14040349
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article: Correction: Lee et al. Improved Optical Efficiency of 850-nm Infrared Light-Emitting Diode with Reflective Transparent Structure.

    Lee, Hyung-Joo / Park, Jin-Young / Kwac, Lee-Ku / Lee, Jongsu

    Micromachines

    2024  Volume 15, Issue 2

    Abstract: In the original publication [ ... ]. ...

    Abstract In the original publication [...].
    Language English
    Publishing date 2024-02-05
    Publishing country Switzerland
    Document type Published Erratum
    ZDB-ID 2620864-7
    ISSN 2072-666X
    ISSN 2072-666X
    DOI 10.3390/mi15020241
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article ; Online: Investigation of Interface Characteristics and Physisorption Mechanism in Quantum Dots/TiO

    Chon, Bumsoo / Lee, Hyung Joo / Kang, Yun / Kim, Hyun Woo / Kim, Chul Hoon / Son, Ho-Jin

    ACS applied materials & interfaces

    2024  Volume 16, Issue 7, Page(s) 9414–9427

    Abstract: Owing to their superior stability compared to those of conventional molecular dyes, as well as their high UV-visible absorption capacity, which can be tuned to cover the majority of the solar spectrum through size adjustment, quantum dot (QD)/ ... ...

    Abstract Owing to their superior stability compared to those of conventional molecular dyes, as well as their high UV-visible absorption capacity, which can be tuned to cover the majority of the solar spectrum through size adjustment, quantum dot (QD)/TiO
    Language English
    Publishing date 2024-02-09
    Publishing country United States
    Document type Journal Article
    ISSN 1944-8252
    ISSN (online) 1944-8252
    DOI 10.1021/acsami.3c16086
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article: Improved Optical Efficiency of 850-nm Infrared Light-Emitting Diode with Reflective Transparent Structure.

    Lee, Hyung-Joo / Park, Jin-Young / Kwac, Lee-Ku / Lee, Jongsu

    Micromachines

    2023  Volume 14, Issue 8

    Abstract: This study investigated a reflective transparent structure to improve the optical efficiency of 850 nm infrared light-emitting diodes (IR-LEDs), by effectively enhancing the number of extracted photons emitted from the active region. The reflective ... ...

    Abstract This study investigated a reflective transparent structure to improve the optical efficiency of 850 nm infrared light-emitting diodes (IR-LEDs), by effectively enhancing the number of extracted photons emitted from the active region. The reflective transparent structure was fabricated by combining transparent epitaxial and reflective bonding structures. The transparent epitaxial structure was grown by the liquid-phase epitaxy method, which efficiently extracted photons emitted from the active area in IR-LEDs, both in the vertical and horizontal directions. Furthermore, a reflective bonding structure was fabricated using an omnidirectional reflector and a eutectic metal, which efficiently reflected the photons emitted downwards from the active area in an upward direction. To evaluate reflective transparent IR-LED efficiency, a conventional absorbing substrate infrared light-emitting diode (AS IR-LED) and a transparent substrate infrared light-emitting diode (TS IR-LED) were fabricated, and their characteristics were analyzed. Based on the power-current (L-I) evaluation results, the output power (212 mW) of the 850 nm IR-LED with the reflective transparent structure increased by 76% and 26%, relative to those of the AS IR-LED (121 mW) and TS IR-LED (169 mW), respectively. Furthermore, the reflective transparent structure possesses both transparent and reflective properties, as confirmed by photometric and radial theta measurements. Therefore, light photons emitted from the active area of the 850 nm IR-LED were efficiently extracted upward and sideways, because of the reflective transparent structure.
    Language English
    Publishing date 2023-08-12
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2620864-7
    ISSN 2072-666X
    ISSN 2072-666X
    DOI 10.3390/mi14081586
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  7. Article ; Online: Neighborhood-scale ambient NO

    Lee, Hyung Joo / Liu, Yang / Chatfield, Robert B

    The Science of the total environment

    2022  Volume 857, Issue Pt 3, Page(s) 159342

    Abstract: This study estimated long-term average ambient ... ...

    Abstract This study estimated long-term average ambient NO
    MeSH term(s) Nitrogen Dioxide/analysis ; Air Pollution/analysis ; Air Pollutants/analysis ; Environmental Monitoring ; Los Angeles ; Particulate Matter/analysis
    Chemical Substances Nitrogen Dioxide (S7G510RUBH) ; Air Pollutants ; Particulate Matter
    Language English
    Publishing date 2022-10-09
    Publishing country Netherlands
    Document type Journal Article
    ZDB-ID 121506-1
    ISSN 1879-1026 ; 0048-9697
    ISSN (online) 1879-1026
    ISSN 0048-9697
    DOI 10.1016/j.scitotenv.2022.159342
    Database MEDical Literature Analysis and Retrieval System OnLINE

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    In stock of ZB MED Cologne/Königswinter

    Zs.A 949: Show issues Location:
    Je nach Verfügbarkeit (siehe Angabe bei Bestand)
    bis Jg. 1994: Bestellungen von Artikeln über das Online-Bestellformular
    Jg. 1995 - 2021: Lesesall (1.OG)
    ab Jg. 2022: Lesesaal (EG)

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  8. Article ; Online: Drought and ozone air quality in California: Identifying susceptible regions in the preparedness of future drought.

    Lee, Hyung Joo / Bell, Michelle L / Koutrakis, Petros

    Environmental research

    2022  Volume 216, Issue Pt 1, Page(s) 114461

    Abstract: California experienced extreme and prolonged drought conditions during the early 2010s. To date, little is known regarding the influence of drought on air quality. Our study quantified site-specific associations between drought (defined by the ... ...

    Abstract California experienced extreme and prolonged drought conditions during the early 2010s. To date, little is known regarding the influence of drought on air quality. Our study quantified site-specific associations between drought (defined by the Standardized Precipitation-Evapotranspiration Index; SPEI) and daily maximum 8-h ozone (O
    MeSH term(s) Ozone/analysis ; Droughts ; Air Pollutants/analysis ; Air Pollution/analysis ; California
    Chemical Substances Ozone (66H7ZZK23N) ; Air Pollutants
    Language English
    Publishing date 2022-09-28
    Publishing country Netherlands
    Document type Journal Article ; Research Support, U.S. Gov't, Non-P.H.S.
    ZDB-ID 205699-9
    ISSN 1096-0953 ; 0013-9351
    ISSN (online) 1096-0953
    ISSN 0013-9351
    DOI 10.1016/j.envres.2022.114461
    Database MEDical Literature Analysis and Retrieval System OnLINE

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    In stock of ZB MED Cologne/Königswinter

    Zs.A 726: Show issues Location:
    Je nach Verfügbarkeit (siehe Angabe bei Bestand)
    bis Jg. 1994: Bestellungen von Artikeln über das Online-Bestellformular
    Jg. 1995 - 2021: Lesesall (1.OG)
    ab Jg. 2022: Lesesaal (EG)

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  9. Book ; Online: Task Space Control of Hydraulic Construction Machines using Reinforcement Learning

    Lee, Hyung Joo / Brell-Cokcan, Sigrid

    2023  

    Abstract: Teleoperation is vital in the construction industry, allowing safe machine manipulation from a distance. However, controlling machines at a joint level requires extensive training due to their complex degrees of freedom. Task space control offers ... ...

    Abstract Teleoperation is vital in the construction industry, allowing safe machine manipulation from a distance. However, controlling machines at a joint level requires extensive training due to their complex degrees of freedom. Task space control offers intuitive maneuvering, but precise control often requires dynamic models, posing challenges for hydraulic machines. To address this, we use a data-driven actuator model to capture machine dynamics in real-world operations. By integrating this model into simulation and reinforcement learning, an optimal control policy for task space control is obtained. Experiments with Brokk 170 validate the framework, comparing it to a well-known Jacobian-based approach.
    Keywords Computer Science - Robotics
    Publishing date 2023-07-18
    Publishing country us
    Document type Book ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  10. Book ; Online: Reinforcement Learning-based Virtual Fixtures for Teleoperation of Hydraulic Construction Machine

    Lee, Hyung Joo / Brell-Cokcan, Sigrid

    2023  

    Abstract: The utilization of teleoperation is a crucial aspect of the construction industry, as it enables operators to control machines safely from a distance. However, remote operation of these machines at a joint level using individual joysticks necessitates ... ...

    Abstract The utilization of teleoperation is a crucial aspect of the construction industry, as it enables operators to control machines safely from a distance. However, remote operation of these machines at a joint level using individual joysticks necessitates extensive training for operators to achieve proficiency due to their multiple degrees of freedom. Additionally, verifying the machine resulting motion is only possible after execution, making optimal control challenging. In addressing this issue, this study proposes a reinforcement learning-based approach to optimize task performance. The control policy acquired through learning is used to provide instructions on efficiently controlling and coordinating multiple joints. To evaluate the effectiveness of the proposed framework, a user study is conducted with a Brokk 170 construction machine by assessing its performance in a typical construction task involving inserting a chisel into a borehole. The effectiveness of the proposed framework is evaluated by comparing the performance of participants in the presence and absence of virtual fixtures. This study results demonstrate the proposed framework potential in enhancing the teleoperation process in the construction industry.
    Keywords Computer Science - Robotics ; Computer Science - Artificial Intelligence
    Subject code 690
    Publishing date 2023-06-20
    Publishing country us
    Document type Book ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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