Hyoseok Kim - Academia.edu (original) (raw)

Papers by Hyoseok Kim

Nature Communications

Because organic molecules and materials are generally insensitive or weakly sensitive to magnetic... more Because organic molecules and materials are generally insensitive or weakly sensitive to magnetic fields, a certain means to enhance their magnetic responsiveness needs to be exploited. Here we show a strategy to amplify the magnetic responsiveness of self-assembled peptide nanostructures by synergistically combining the concepts of perfect α-helix and rod-coil supramolecular building blocks. Firstly, we develop a monomeric, nonpolar, and perfect α-helix (MNP-helix). Then, we employ the MNP-helix as the rod block of rod-coil amphiphiles (rod-coils) because rod-coils are well-suited for fabricating responsive assemblies. We show that the self-assembly processes of the designed rod-coils and disassembly of rod-coil/DNA complexes can be controlled in a magnetically responsive manner using the relatively weak magnetic field provided by the ordinary neodymium magnet [0.07 ~ 0.25 Tesla (T)]. These results demonstrate that magnetically responsive organic assemblies usable under practical c...

Advanced Materials Interfaces, 2019

In this work, operationally and mechanically stable organic field‐effect transistors (OFETs) are ... more In this work, operationally and mechanically stable organic field‐effect transistors (OFETs) are demonstrated on aramid fiber‐based paper enabled by a simple and universal surface planarization method. By employing a nanoimprint lithography‐inspired surface smoothening method, rough aramid paper is successfully smoothened from a scale of several tens of micrometers to a sub‐nanometer‐scale surface roughness. Owing to the sub‐nanometer‐scale surface roughness of the aramid paper, the OFETs fabricated on the aramid paper exhibit decent field‐effect mobility (0.25 cm2 V−1 s−1) with a high current on‐to‐off ratio (>107), both of which are comparable with those of OFETs fabricated on rigid silicon substrates. Moreover, the OFETs fabricated on the aramid paper exhibit both high operational and mechanical stability; this is indicated by a bias‐stress‐induced threshold voltage shift (∆VTH ≈ 4.27 V under an excessive gate bias stress of 1.7 MV cm−1 for 1 h 30 min) comparable to that of OF...

The method includes setting gamma data including red gamma data, green gamma data, and blue gamma... more The method includes setting gamma data including red gamma data, green gamma data, and blue gamma data, setting a target luminance and a target color coordinate of a first reference gradation, setting red, green And displaying the image on a display device based on a blue input image signal, measuring a first luminance and a first color coordinate from a screen of the display device, calculating a coordinate difference between the first color coordinate and the target color coordinate, 1 brightness and the target brightness are within an allowable tolerance range, and when the coordinate difference and the brightness difference are out of the error range, the first brightness and the first color coordinate are converted into a first coordinate of a CIE XYZ coordinate system Transforming the target brightness and the target color coordinate into target coordinates in a CIE XYZ coordinate system, Comparing the target coordinates to be related to the gamma data generating method and system of the display device including the step of determining the red brightness, green brightness, and blue brightness of the screen to be changed. Gamma data, gamma voltage, luminance, color coordinate, gradation, CIE color coordinate system

An organic light emitting display device and a manufacturing method thereof are provided to preve... more An organic light emitting display device and a manufacturing method thereof are provided to prevent ultraviolet rays from influencing on a semiconductor layer and an organic light emitting element by forming a non-transmission layer on a substrate. An organic light emitting display device(101) includes a substrate(110), a non-transmission layer(210), a semiconductor layer(130), an organic light emitting element(190), an encapsulation material(240), an encapsulation substrate(250), and a bonding agent(260). The non-transmission layer is formed on a bottom surface of the substrate. The semiconductor layer is formed on a top surface of the substrate. The organic light emitting element is formed on the semiconductor layer. The encapsulation material is formed on a circumference of the top surface of the substrate as an outer circumference of the semiconductor and the organic light emitting element. The encapsulation substrate is attached to the encapsulation material. The bonding agent is formed on the non-transmission layer.

SPIE Proceedings, 2013

ABSTRACT World’s first commercialized 55-inch WRGB OLED TV has been developed and launched recent... more ABSTRACT World’s first commercialized 55-inch WRGB OLED TV has been developed and launched recently. Large-sized OLED displays require novel technologies to realize mass production. We will introduce commercialized 55-inch WRGB OLED TV and its novel technologies including oxide TFT, WOLED, solid phase encapsulation, and compensation technologies.

Chemistry – A European Journal, 2009

Showing their true colors? Full emission color tuning in the visible region can be achieved with ... more Showing their true colors? Full emission color tuning in the visible region can be achieved with salen–aluminum complexes that are electronically modulated at C5 of the phenoxide ring in the salen moiety. Emission spectra for various substituents R5 are shown (EWG: electron‐withdrawing group, EDG: electron‐donating group).magnified imageA series of salen–aluminum complexes, [{(R5)2‐salen(3‐tBu)2}Al(OC6H4‐p‐C6H5)] (salen=N,N′‐bis(salicylidene)ethylenediamine; R5=H (1), tBu (2), Br (3), Ph (4), OMe (5), NMe2 (6)) and [{5,5′‐(NMe3)2‐salen(3‐tBu)2}Al(OC6H4‐p‐C6H5)][OTf]2 (7; OTf=CF3SO3) that are electronically modulated directly at C5 of the phenoxide ring in the salen moiety has been prepared. The crystal structures of 1, 4, 6, and 7 determined by X‐ray diffraction reveal distorted square‐pyramidal geometries around the Al atoms. Complexes 1–7 are all air‐stable in both the solid and solution states and have high thermal stability (decomp 313–338 °C). Differential scanning calorimetric...

Carbohydrate Research, 1989

Copolycarbonates with flexible spacers have been prepared by melt condensation of 4,4'-bis[(2-hyd... more Copolycarbonates with flexible spacers have been prepared by melt condensation of 4,4'-bis[(2-hydroxyethyl)oxy]biphenyl, 1,5-bis[(2-hydroxyethyl)oxy]naphthalene and pentarespectively octamethylene diphenyl dicarbonate in varying concentrations. These random copolycarbonates show liquid crystalline behavior, with the formation of a nematic phase over a temperature range of maximum 22 "C respectively 47 "C, this for at least 75 mol-% of biphenyl units. Incorporation of 1,5-bis[(6-hydroxyhexyl)oxy]naphthalene does not lead to liquid crystallinity. Copolymers with 2,6-bis[(6-hydroxyhexyl)oxy]naphthalene and 4,4'-bis[(6-hydroxyhexyl)oxy]biphenyl show mesomorphic behavior, with the formation of a mesophase with a maximum width of 20 "C, for incorporation up to 75 mol-% of either of the mesogenic units. Copolycarbonates which contain only biphenyl mesogenic units and which differ in the length of the flexible spacers were also obtained; they behave liquid crystalline over the entire composition range with maximum 34 "C for the nematic phase region.

Advanced Materials Interfaces, 2019

Nano Letters, 2019

Table of Content Section S1: Fabrication of silicon micropillar array (SiMPA) Section S2: Biocomp... more Table of Content Section S1: Fabrication of silicon micropillar array (SiMPA) Section S2: Biocompatibility test of SiMPA for a skin (mouse & human skins) Section S3: Synthesis of the self-assembled artificial peptide (SAP) Section S4: Synthesis of gold nanoparticles and analysis of fluorescence quenching Section S5: Sodium dodecyl sulfate-polyacrylamide gel electrophoresis analysis Section S6: Synthesis of the dendritic peptide for mercury ion binding

Electronics Letters, 2018

With the rapid spread of image editing software, anyone can easily create, distribute, and forge ... more With the rapid spread of image editing software, anyone can easily create, distribute, and forge images. Although techniques to detect image forgery have been widely studied, current techniques have significant limitations, such as specific file formats, manipulations, or compression qualities. Although deep learning techniques have been introduced to detect various manipulations, such as blurring, median filtering, and Gaussian noise, these techniques are only suitable to detect forgeries of uncompressed images, and are difficult to apply in practice because most images are compressed for distribution. Therefore, a twostream neural network approach for image forensics that is robust to compression is proposed. The two-stream neural network is based on constrained convolutional neural network and Markov characteristics to consider compression. Experimental results show that the proposed method overcomes current technique limitations.

J. Mater. Chem. C, 2017

Highly luminescent blue-emitting CdZnS/ZnS nanorods were demonstrated. A study on the electric fi... more Highly luminescent blue-emitting CdZnS/ZnS nanorods were demonstrated. A study on the electric field-induced fluorescence switching property was presented.

Bulletin of the Korean Chemical Society, 2014

The importance of including spin-orbit interactions for the correct description of structures and... more The importance of including spin-orbit interactions for the correct description of structures and vibrational frequencies of haloiodomethanes is demonstrated by density functional theory calculations with spin-orbit relativistic effective core potentials (SO-DFT). The vibrational frequencies and the molecular geometries obtained by SO-DFT calculations do not match with the experimental results as well as for other cations without significant relativistic effects. In this sense, the present data can be considered as a guideline in the development of the relativistic quantum chemical methods. The influence of spin-orbit effects on the bending frequency of the cation could well be recognized by comparing the experimental and calculated results for CH 2 BrI and CH 2 ClI cations. Spin-orbit effects on the geometries and vibrational frequencies of CH 2 XI (X=F, Cl, Br, and I) neutral are negligible except that C-I bond lengths of haloiodomethane neutral is slightly increased by the inclusion of spin-orbit effects. The 2 A' and 2 A'' states were found in the cations of haloiodomethanes and mix due to the spin-orbit interactions and generate two 2 E 1/2 fine-structure states. The geometries of CH 2 XI + (X=F and Cl) from SO-DFT calculations are roughly in the middle of two cation geometries from DFT calculations since two cation states of CH 2 XI (X=F and Cl) from DFT calculations are energetically close enough to mix two cation states. The geometries of CH 2 XI + (X=Br and I) from SO-DFT calculations are close to that of the most stable cation from DFT calculations since two cation states of CH 2 XI (X=Br and I) from DFT calculations are energetically well separated near the fine-structure state minimum.

The present invention relates to an organic light emitting display panel and a method of manufact... more The present invention relates to an organic light emitting display panel and a method of manufacturing the same. In accordance with a coating mucous membrane, there is provided a display panel. The display panel in one example includes a light shielding layer electrically connected to a driving power line on a substrate, and storage capacitors formed on an oxide semiconductor in parallel, insulated from the oxide semiconductor, and overlapped a gate.

Bioconjugate chemistry, Jan 16, 2016

Although there has been substantial advancement in the development of nanostructures, the develop... more Although there has been substantial advancement in the development of nanostructures, the development of self-assembled nanostructures that can selectively recognize multivalent targets has been very difficult. Here we show the proof of concept that topology-controlled peptide nanoassemblies can selectively recognize and detect a multivalent RNA target. We compared the differential behaviors of peptides in a linear or cyclic topology in terms of peptide-gold nanoparticle hybrid nanostructure formation, conformational stabilization, monovalent and multivalent RNA binding in vitro, and multivalent RNA recognition in live cells. When the topology-dependent selectivity amplification of the cyclic peptide hybrids is combined with the noninvasive nature of dark-field microscopy, the cellular localization of the viral Rev response element (RRE) RNA can be monitored in situ. Because intracellular interactions are often mediated by overlapping binding partners with weak affinity, the topolog...

Nanoscale, 2016

The formation of fullerene carbon nanobuds (CNBs) on carbon nanotube (CNT) caps is energetically ... more The formation of fullerene carbon nanobuds (CNBs) on carbon nanotube (CNT) caps is energetically more favorable than that on CNT sidewalls. Generally, CNBs based on CNT ends can induce resonant transmissions near the Fermi level.

Nature Communications

Because organic molecules and materials are generally insensitive or weakly sensitive to magnetic... more Because organic molecules and materials are generally insensitive or weakly sensitive to magnetic fields, a certain means to enhance their magnetic responsiveness needs to be exploited. Here we show a strategy to amplify the magnetic responsiveness of self-assembled peptide nanostructures by synergistically combining the concepts of perfect α-helix and rod-coil supramolecular building blocks. Firstly, we develop a monomeric, nonpolar, and perfect α-helix (MNP-helix). Then, we employ the MNP-helix as the rod block of rod-coil amphiphiles (rod-coils) because rod-coils are well-suited for fabricating responsive assemblies. We show that the self-assembly processes of the designed rod-coils and disassembly of rod-coil/DNA complexes can be controlled in a magnetically responsive manner using the relatively weak magnetic field provided by the ordinary neodymium magnet [0.07 ~ 0.25 Tesla (T)]. These results demonstrate that magnetically responsive organic assemblies usable under practical c...

Advanced Materials Interfaces, 2019

In this work, operationally and mechanically stable organic field‐effect transistors (OFETs) are ... more In this work, operationally and mechanically stable organic field‐effect transistors (OFETs) are demonstrated on aramid fiber‐based paper enabled by a simple and universal surface planarization method. By employing a nanoimprint lithography‐inspired surface smoothening method, rough aramid paper is successfully smoothened from a scale of several tens of micrometers to a sub‐nanometer‐scale surface roughness. Owing to the sub‐nanometer‐scale surface roughness of the aramid paper, the OFETs fabricated on the aramid paper exhibit decent field‐effect mobility (0.25 cm2 V−1 s−1) with a high current on‐to‐off ratio (>107), both of which are comparable with those of OFETs fabricated on rigid silicon substrates. Moreover, the OFETs fabricated on the aramid paper exhibit both high operational and mechanical stability; this is indicated by a bias‐stress‐induced threshold voltage shift (∆VTH ≈ 4.27 V under an excessive gate bias stress of 1.7 MV cm−1 for 1 h 30 min) comparable to that of OF...

The method includes setting gamma data including red gamma data, green gamma data, and blue gamma... more The method includes setting gamma data including red gamma data, green gamma data, and blue gamma data, setting a target luminance and a target color coordinate of a first reference gradation, setting red, green And displaying the image on a display device based on a blue input image signal, measuring a first luminance and a first color coordinate from a screen of the display device, calculating a coordinate difference between the first color coordinate and the target color coordinate, 1 brightness and the target brightness are within an allowable tolerance range, and when the coordinate difference and the brightness difference are out of the error range, the first brightness and the first color coordinate are converted into a first coordinate of a CIE XYZ coordinate system Transforming the target brightness and the target color coordinate into target coordinates in a CIE XYZ coordinate system, Comparing the target coordinates to be related to the gamma data generating method and system of the display device including the step of determining the red brightness, green brightness, and blue brightness of the screen to be changed. Gamma data, gamma voltage, luminance, color coordinate, gradation, CIE color coordinate system

An organic light emitting display device and a manufacturing method thereof are provided to preve... more An organic light emitting display device and a manufacturing method thereof are provided to prevent ultraviolet rays from influencing on a semiconductor layer and an organic light emitting element by forming a non-transmission layer on a substrate. An organic light emitting display device(101) includes a substrate(110), a non-transmission layer(210), a semiconductor layer(130), an organic light emitting element(190), an encapsulation material(240), an encapsulation substrate(250), and a bonding agent(260). The non-transmission layer is formed on a bottom surface of the substrate. The semiconductor layer is formed on a top surface of the substrate. The organic light emitting element is formed on the semiconductor layer. The encapsulation material is formed on a circumference of the top surface of the substrate as an outer circumference of the semiconductor and the organic light emitting element. The encapsulation substrate is attached to the encapsulation material. The bonding agent is formed on the non-transmission layer.

SPIE Proceedings, 2013

ABSTRACT World’s first commercialized 55-inch WRGB OLED TV has been developed and launched recent... more ABSTRACT World’s first commercialized 55-inch WRGB OLED TV has been developed and launched recently. Large-sized OLED displays require novel technologies to realize mass production. We will introduce commercialized 55-inch WRGB OLED TV and its novel technologies including oxide TFT, WOLED, solid phase encapsulation, and compensation technologies.

Chemistry – A European Journal, 2009

Showing their true colors? Full emission color tuning in the visible region can be achieved with ... more Showing their true colors? Full emission color tuning in the visible region can be achieved with salen–aluminum complexes that are electronically modulated at C5 of the phenoxide ring in the salen moiety. Emission spectra for various substituents R5 are shown (EWG: electron‐withdrawing group, EDG: electron‐donating group).magnified imageA series of salen–aluminum complexes, [{(R5)2‐salen(3‐tBu)2}Al(OC6H4‐p‐C6H5)] (salen=N,N′‐bis(salicylidene)ethylenediamine; R5=H (1), tBu (2), Br (3), Ph (4), OMe (5), NMe2 (6)) and [{5,5′‐(NMe3)2‐salen(3‐tBu)2}Al(OC6H4‐p‐C6H5)][OTf]2 (7; OTf=CF3SO3) that are electronically modulated directly at C5 of the phenoxide ring in the salen moiety has been prepared. The crystal structures of 1, 4, 6, and 7 determined by X‐ray diffraction reveal distorted square‐pyramidal geometries around the Al atoms. Complexes 1–7 are all air‐stable in both the solid and solution states and have high thermal stability (decomp 313–338 °C). Differential scanning calorimetric...

Carbohydrate Research, 1989

Copolycarbonates with flexible spacers have been prepared by melt condensation of 4,4'-bis[(2-hyd... more Copolycarbonates with flexible spacers have been prepared by melt condensation of 4,4'-bis[(2-hydroxyethyl)oxy]biphenyl, 1,5-bis[(2-hydroxyethyl)oxy]naphthalene and pentarespectively octamethylene diphenyl dicarbonate in varying concentrations. These random copolycarbonates show liquid crystalline behavior, with the formation of a nematic phase over a temperature range of maximum 22 "C respectively 47 "C, this for at least 75 mol-% of biphenyl units. Incorporation of 1,5-bis[(6-hydroxyhexyl)oxy]naphthalene does not lead to liquid crystallinity. Copolymers with 2,6-bis[(6-hydroxyhexyl)oxy]naphthalene and 4,4'-bis[(6-hydroxyhexyl)oxy]biphenyl show mesomorphic behavior, with the formation of a mesophase with a maximum width of 20 "C, for incorporation up to 75 mol-% of either of the mesogenic units. Copolycarbonates which contain only biphenyl mesogenic units and which differ in the length of the flexible spacers were also obtained; they behave liquid crystalline over the entire composition range with maximum 34 "C for the nematic phase region.

Advanced Materials Interfaces, 2019

Nano Letters, 2019

Table of Content Section S1: Fabrication of silicon micropillar array (SiMPA) Section S2: Biocomp... more Table of Content Section S1: Fabrication of silicon micropillar array (SiMPA) Section S2: Biocompatibility test of SiMPA for a skin (mouse & human skins) Section S3: Synthesis of the self-assembled artificial peptide (SAP) Section S4: Synthesis of gold nanoparticles and analysis of fluorescence quenching Section S5: Sodium dodecyl sulfate-polyacrylamide gel electrophoresis analysis Section S6: Synthesis of the dendritic peptide for mercury ion binding

Electronics Letters, 2018

With the rapid spread of image editing software, anyone can easily create, distribute, and forge ... more With the rapid spread of image editing software, anyone can easily create, distribute, and forge images. Although techniques to detect image forgery have been widely studied, current techniques have significant limitations, such as specific file formats, manipulations, or compression qualities. Although deep learning techniques have been introduced to detect various manipulations, such as blurring, median filtering, and Gaussian noise, these techniques are only suitable to detect forgeries of uncompressed images, and are difficult to apply in practice because most images are compressed for distribution. Therefore, a twostream neural network approach for image forensics that is robust to compression is proposed. The two-stream neural network is based on constrained convolutional neural network and Markov characteristics to consider compression. Experimental results show that the proposed method overcomes current technique limitations.

J. Mater. Chem. C, 2017

Highly luminescent blue-emitting CdZnS/ZnS nanorods were demonstrated. A study on the electric fi... more Highly luminescent blue-emitting CdZnS/ZnS nanorods were demonstrated. A study on the electric field-induced fluorescence switching property was presented.

Bulletin of the Korean Chemical Society, 2014

The importance of including spin-orbit interactions for the correct description of structures and... more The importance of including spin-orbit interactions for the correct description of structures and vibrational frequencies of haloiodomethanes is demonstrated by density functional theory calculations with spin-orbit relativistic effective core potentials (SO-DFT). The vibrational frequencies and the molecular geometries obtained by SO-DFT calculations do not match with the experimental results as well as for other cations without significant relativistic effects. In this sense, the present data can be considered as a guideline in the development of the relativistic quantum chemical methods. The influence of spin-orbit effects on the bending frequency of the cation could well be recognized by comparing the experimental and calculated results for CH 2 BrI and CH 2 ClI cations. Spin-orbit effects on the geometries and vibrational frequencies of CH 2 XI (X=F, Cl, Br, and I) neutral are negligible except that C-I bond lengths of haloiodomethane neutral is slightly increased by the inclusion of spin-orbit effects. The 2 A' and 2 A'' states were found in the cations of haloiodomethanes and mix due to the spin-orbit interactions and generate two 2 E 1/2 fine-structure states. The geometries of CH 2 XI + (X=F and Cl) from SO-DFT calculations are roughly in the middle of two cation geometries from DFT calculations since two cation states of CH 2 XI (X=F and Cl) from DFT calculations are energetically close enough to mix two cation states. The geometries of CH 2 XI + (X=Br and I) from SO-DFT calculations are close to that of the most stable cation from DFT calculations since two cation states of CH 2 XI (X=Br and I) from DFT calculations are energetically well separated near the fine-structure state minimum.

The present invention relates to an organic light emitting display panel and a method of manufact... more The present invention relates to an organic light emitting display panel and a method of manufacturing the same. In accordance with a coating mucous membrane, there is provided a display panel. The display panel in one example includes a light shielding layer electrically connected to a driving power line on a substrate, and storage capacitors formed on an oxide semiconductor in parallel, insulated from the oxide semiconductor, and overlapped a gate.

Bioconjugate chemistry, Jan 16, 2016

Although there has been substantial advancement in the development of nanostructures, the develop... more Although there has been substantial advancement in the development of nanostructures, the development of self-assembled nanostructures that can selectively recognize multivalent targets has been very difficult. Here we show the proof of concept that topology-controlled peptide nanoassemblies can selectively recognize and detect a multivalent RNA target. We compared the differential behaviors of peptides in a linear or cyclic topology in terms of peptide-gold nanoparticle hybrid nanostructure formation, conformational stabilization, monovalent and multivalent RNA binding in vitro, and multivalent RNA recognition in live cells. When the topology-dependent selectivity amplification of the cyclic peptide hybrids is combined with the noninvasive nature of dark-field microscopy, the cellular localization of the viral Rev response element (RRE) RNA can be monitored in situ. Because intracellular interactions are often mediated by overlapping binding partners with weak affinity, the topolog...

Nanoscale, 2016

The formation of fullerene carbon nanobuds (CNBs) on carbon nanotube (CNT) caps is energetically ... more The formation of fullerene carbon nanobuds (CNBs) on carbon nanotube (CNT) caps is energetically more favorable than that on CNT sidewalls. Generally, CNBs based on CNT ends can induce resonant transmissions near the Fermi level.