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  1. No Access

    Chapter and Conference Paper

    Efficient k-Center Algorithms for Planar Points in Convex Position

    We present an efficient algorithm for the planar k-center problem for points in convex position under the Euclidean distance. Given n points in convex position in the plane, our algorithm computes k congruent dis...

    Jongmin Choi, Jaegun Lee, Hee-Kap Ahn in Algorithms and Data Structures (2023)

  2. Article

    Open Access

    High-Performance Perovskite Quantum Dot Solar Cells Enabled by Incorporation with Dimensionally Engineered Organic Semiconductor

  3. We designed and developed a 3D star-shaped conjugated molecule (Star-TrCN) to incorporate organic semiconductor with CsPbI3 perovskite quantum dots (PQDs).

  4. Seyeong Lim, Dae Hwan Lee, Hyuntae Choi, Yelim Choi, Dong Geon Lee in Nano-Micro Letters (2022)

  5. No Access

    Article

    Maximizing Dominance in the Plane and its Applications

    Given a set P of n weighted points, a set Q of m points in the plane, and a positive integer k, we consider the optimization problem of finding a subset of Q with at most k points that dominates a subset of P wit...

    Jongmin Choi, Sergio Cabello, Hee-Kap Ahn in Algorithmica (2021)

  6. No Access

    Chapter and Conference Paper

    Covering Convex Polygons by Two Congruent Disks

    We consider the planar two-center problem for a convex polygon: given a convex polygon in the plane, find two congruent disks of minimum radius whose union contains the polygon. We present an

    Jongmin Choi, Dahye Jeong, Hee-Kap Ahn in Combinatorial Algorithms (2021)

  7. No Access

    Chapter and Conference Paper

    Intersecting Disks Using Two Congruent Disks

    We consider the Euclidean 2-center problem for a set of n disks in the plane: find two smallest congruent disks such that every disk in the set intersects at least one of the two congruent disks. We present a det...

    Byeonguk Kang, Jongmin Choi, Hee-Kap Ahn in Combinatorial Algorithms (2021)

  8. No Access

    Article

    A Feasible and Holistic Characterization of an Affordable Anti-Fog Coating Enhancing Readability

    In the interest of a science of simplicity, investigation within coating technology calls for a step towards overcoming the drawbacks of conventional methodologies, e.g., costly nanofabrication and naive trans...

    Hyeok Jung Kim, Jongmin Choi, Hyeran Noh in Macromolecular Research (2020)

  9. Article

    Open Access

    Cascade surface modification of colloidal quantum dot inks enables efficient bulk homojunction photovoltaics

    Control over carrier type and do** levels in semiconductor materials is key for optoelectronic applications. In colloidal quantum dots (CQDs), these properties can be tuned by surface chemistry modification,...

    Min-Jae Choi, F. Pelayo García de Arquer, Andrew H. Proppe in Nature Communications (2020)

  10. Article

    Open Access

    Peptidoglycan binding protein (PGBP)-modified magnetic nanobeads for efficient magnetic capturing of Staphylococcus aureus associated with sepsis in blood

    Peptidoglycan-binding protein-modified magnetic nanobeads (PGBP-MNBs) were prepared for efficient magnetic capturing of Staphylococcus aureus (S. aureus), which is associated with sepsis, using the binding aff...

    Jaewoo Lim, Jongmin Choi, Kyeonghye Guk, Seong Uk Son, Do Kyung Lee in Scientific Reports (2019)

  11. No Access

    Chapter and Conference Paper

    Maximizing Dominance in the Plane and Its Applications

    Given a set P of n points with weights (possibly negative), a set Q

    Jongmin Choi, Sergio Cabello, Hee-Kap Ahn in Algorithms and Data Structures (2019)

  12. No Access

    Chapter and Conference Paper

    Minimum-Width Annulus with Outliers: Circular, Square, and Rectangular Cases

    We study the problem of computing a minimum-width annulus with outliers. Specifically, given a set of n points in the plane and a nonnegative integer ...

    Hee-Kap Ahn, Taehoon Ahn, Sang Won Bae, Jongmin Choi in WALCOM: Algorithms and Computation (2018)

  13. No Access

    Chapter and Conference Paper

    Minimum-Width Square Annulus Intersecting Polygons

    For k (possibly overlap**) polygons of total complexity n in the plane, we present an algorithm for computing a minimum-width square annulus that intersects all input polygons in

    Hee-Kap Ahn, Taehoon Ahn, Jongmin Choi, Mincheol Kim in WALCOM: Algorithms and Computation (2018)

  14. No Access

    Article

    Research trend of cascade heat pumps

    Most commercial and industrial facilities require very low temperatures for refrigeration and high temperatures for space heating and hot water purposes. Single stage heat pumps have not been able to meet thes...

    Samuel Boahen, JongMin Choi in Science China Technological Sciences (2017)

  15. No Access

    Chapter and Conference Paper

    Bundling Two Simple Polygons to Minimize Their Convex Hull

    Given two simple polygons P and Q in the plane, we study the problem of finding a placement \(\varphi P\) o...

    Jongmin Choi, Dongwoo Park, Hee-Kap Ahn in WALCOM: Algorithms and Computation (2017)

  16. Article

    Open Access

    Pt-Free Counter Electrodes with Carbon Black and 3D Network Epoxy Polymer Composites

    Carbon black (CB) and a 3D network epoxy polymer composite, representing dual functions for conductive corrosion protective layer (CCPL) and catalytic layer (CL) by the control of CB weight ratio against polym...

    Gyeongho Kang, Jongmin Choi, Taiho Park in Scientific Reports (2016)

  17. No Access

    Article

    Improved detection of Cucumber mosaic virus coat protein (CMV-CP) in genetically modified pepper (Capsicum annuum) using a polyclonal antibody to a synthetic CP peptide

    Enormous economic losses caused by infection of peppers with Cucumber mosaic virus (CMV) have spurred the development of CMV-resistant peppers using genetic techniques. However, growing concern from the genera...

    Jongmin Choi, Chanvorleak Phat, Eunji Kim in Horticulture, Environment, and Biotechnolo… (2015)

  18. No Access

    Article

    Numerical analysis on the performance of cooling plates in a PEFC

    Among the various types of fuel cells, the polymer electrolyte fuel cell (PEFC) is one of the prospective power sources for automotive applications, stationary cogeneration systems, and mobile electronic devic...

    Jongmin Choi, Yoon-Ho Kim, Yongtaek Lee in Journal of Mechanical Science and Technolo… (2008)

  19. No Access

    Article

    Performance characteristics of a MPCM slurry cooled unit designed for telecommunication equipment

    Optimum control of the PCB surface temperature is very important in achieving high performance and operational reliability of telecommunication equipment with high power density and thermal density. In this st...

    Jongmin Choi, Jongug Jeon, Yongchan Kim in Journal of Mechanical Science and Technology (2008)