Jeong‐Hyun Cho

Creation of a Special-Purpose Drone Industrial Ecosystem and Testing Facilities

Sung-Phil Heo, Bong Gu Kang, Jeong‐Min Kim, Jeong‐Hyun Cho

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Self‐Assembly for Creating Vertically‐Aligned Graphene Micro Helices with Monolayer Graphene as Chiral Metamaterials (Adv. Mater. 27/2024)

Zihao Lin, Carol Mikhael, Chunhui Dai, Jeong‐Hyun Cho

Vertically-Aligned Graphene Micro Helices In article number 2401451, Jeong-Hyun Cho and co-workers introduce a dual-component self-assembly method that facilitates the creation of vertically-aligned monolayer graphene micro helices with heights in the millimeter range. The vertically aligned graphene helices enhance light interactions beyond …

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Self‐Assembly for Creating Vertically‐Aligned Graphene Micro Helices with Monolayer Graphene as Chiral Metamaterials

Zihao Lin, Carol Mikhael, Chunhui Dai, Jeong‐Hyun Cho

Graphene's emergence enables creating chiral metamaterials in helical shapes for terahertz (THz) applications, overcoming material limitations. However, practical implementation remains theoretical due to fabrication challenges. This paper introduces a dual-component self-assembly technique that enables creating vertically-aligned continuous monolayer graphene helices at microscale …

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14.10 34.7A/mm2 Scalable Distributed All-Digital 6×6 Dot-LDOs Featuring Freely Linkable Current-Sharing Network: A Fine-Grained On-Chip Power Delivery Solution in 28nm CMOS

Yong-Jin Lee, Woojin Jang, Hong-Hyun Bae, Jeong‐Hyun Cho et autres

As modern SoCs become more power-intensive, the distributed LDO architecture is emerging as a solution for on-chip power delivery [1] –[6]. Multiple digital LDO (D-LDO) units cooperate inside this framework to regulate supply voltage via a shared power grid network. By evenly …

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Towards cost-effective and sustainable III-V solar cells fabrication

Alexandre Chapotot, Bouraoui Ilahi, Tadeáš Hanuš, Gwénaëlle Hamon et autres

International audience

fr, ca (code pays fourni par la source)

A Fully Integrated Multi-Phase Buck Converter With On-Chip Capacitor Dynamic Re-Allocation and Fine-Grained Phase-Shedding Techniques

Jeong‐Hyun Cho, Dong-Kyu Kim, Hong-Hyun Bae, Yong-Jin Lee et autres

This article presents a fully integrated multi-phase (MP) buck converter for on-chip power management units. A peak-and-valley differential sensing (PVDS) scheme based on a flying capacitor is proposed to evenly balance the multiple inductor currents without significant power overhead even under mismatches …

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A 97.6%-Efficient 1-2MHz Hysteretic Buck Converter with 7V/μs DVS-Rate Enabled by Isosceles-Triangular Shunt Current Push-Pull Technique

Hong-Hyun Bae, Jeong‐Hyun Cho, Gyeong-Gu Kang, Yousung Park et autres

This paper presents a fast dynamic voltage scaling (DVS) buck converter without losing high efficiency. The proposed isosceles-triangular shunt current (ITSC) push-pull technique allows a turning-point for optimal DVS to be independent of passive components while supplying sufficient current of 35A/μs. Current-tailing …

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Realization of Curved Circular Nanotubes Using In Situ Monitored Self-Assembly

Zihao Lin, Chunhui Dai, Jeong‐Hyun Cho

Curved fluidic channels with a circular cross-section play an important role in biology, chemistry, and medicine. However, in nanofluidics, a problem that is largely unsolved is the lack of an effective fabrication method for curved circular nanotubes (10-1000 nm). In this work, …

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A 50.7-dB-DR Finger-Resistance Extracting Multi-Touch Sensor IC for Soft Classification of Fingers Contacted on 6.7-in Capacitive Touch Screen Panel

Tae-Gyun Song, Dong-Kyu Kim, Jeong‐Hyun Cho, Ji-Hun Lee et autres

This article presents multi-touch readout IC embedding finger-resistance extraction (FRE) on a capacitive touch screen panel (TSP). The proposed FRE mode is aimed to have the ability to tell users apart while sensing touch input by utilizing a unique finger’s resistance due …

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Forward bending of silicon nanowires induced by strain distribution in asymmetric growth

Yongkang Xu, Lianbi Li, Yuan Zang, Jichao Hu et autres

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Hybridized Radial and Edge Coupled 3D Plasmon Modes in Self‐Assembled Graphene Nanocylinders

Chunhui Dai, Kriti Agarwal, Hans A. Bechtel, Chao Liu et autres

Current graphene-based plasmonic devices are restricted to 2D patterns defined on planar substrates; thus, they suffer from spatially limited 2D plasmon fields. Here, 3D graphene forming freestanding nanocylinders realized by a plasma-triggered self-assembly process are introduced. The graphene-based nanocylinders induce hybridized edge …

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Electron Beam Maneuvering of a Single Polymer Layer for Reversible 3D Self-Assembly

Chunhui Dai, Jeong‐Hyun Cho

Reversible self-assembly that allows materials to switch between structural configurations has triggered innovation in various applications, especially for reconfigurable devices and robotics. However, reversible motion with nanoscale controllability remains challenging. This paper introduces a reversible self-assembly using stress generated by electron irradiation …

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