Hyung-Il Kim's research while affiliated with Seoul National University and other places
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Publications (46)
Most existing approaches to developing robotic manipulators or artificial hands have used rigid components, with joints, linkages, gears, and motors. Rigid robotic systems can perform tasks with precise and articulated motion, but require complex integrated feedback-based control systems. Soft robotics is an emerging research field that uses deform...
Morphing technology is inspired by biological motion for implementation in missions in a variety of areas without shape-change device. This study investigates the aerodynamic performance of a self-contained morphing winglet for an unmanned aerial vehicle (UAV) that mimics the wing-tip feathers of gliding birds. A smart soft composite (SSC), formed...
Intricate deflection requires many conventional actuators (motors, pistons etc.), which can be financially and spatially wasteful. Novel smart soft composite (SSC) actuators have been suggested, but fabrication complexity restricts their widespread use as general-purpose actuators. In this study, a hybrid manufacturing process comprising 3-D printi...
Head-and-neck cancer is often treated with intensive irradiation focused on the tumor, while delivering the minimum amount of irradiation to normal cells. Since a course of radiotherapy can take 5–6 weeks or more, the repeatability of the patient posture and the fastening method during treatment are important determinants of the success of radiothe...
There are a lot of low head sites in isolated areas, especially in third world countries, where pico and micro hydropower are realistic energy option as national grid extension to those places are unlikely because of sparse population and high transmission cost. While implementing pico hydro system in developing countries turbine manufacturing cost...
Pressure sensitive adhesives (PSAs) with higher thermal stability were synthesized by crosslinking acrylic copolymer with naphthyl curing agent. The acrylic copolymer was synthesized for a base resin of PSAs by solution polymerization of 2-ethylhexyl acrylate, ethyl acrylate, and acrylic acid with N,N '-azobisisobutyronitrile as an initiator. The a...
Objectives
To identify possible clinical differences between male, premenopausal, and postmenopausal female patients with burning mouth symptoms.Background
Burning mouth symptoms are known to occur predominantly in postmenopausal women. In some rare cases, however, such symptoms may also appear in men and younger premenopausal women. There is no in...
Pressure sensitive adhesives (PSAs) with higher thermal stability were successfully prepared by forming composite with the silica nanoparticles modified via reaction with 3-methacryloxypropyltrimethoxysilane. The acrylic copolymer was synthesized as a base resin for PSAs by solution polymerization of 2-EHA, EA, and AA with AIBN as an initiator. The...
Acrylic pressure sensitive adhesives (PSAs) with higher thermal
stability for thin wafer handling were successfully prepared by forming
composite with the graphene oxide (GO) nanoparticles modified to have
vinyl groups via subsequent reaction with isophorone diisocyanate and
2-hydroxyethyl methacrylate. The acrylic copolymer was synthesized as a
ba...
To improve the mechanical properties of polypropylene (PP) biocomposites reinforced with sulfuric acidtreated green algae (SGA), SGA/graphite nanoplatelets (GNP)/PP biocomposites were prepared and their properties were evaluated depending on the particle size and content of GNP. The flexural and impact strength of SGA/GNP/PP biocomposites decreased...
Acrylic pressure-sensitive adhesives (PSAs) need to show proper adhesion and improved wettability on the silicon wafer as the wafer becomes thinner. The acrylic copolymers were synthesized by solution radical polymerization of 2-ethylhexyl acrylate, ethyl acrylate, and acrylic acid with AIBN as an initiator. Adhesion performance and wettability of...
The seaweed (SW) reinforced polypropylene (PP) biocomposites were prepared to investigated the SW species and pretreatment effect on the characteristics of biocomposites. The SW was derived from residue obtained during bioenergy production processing. Laminaria japonica in the form of brown algae (BA) and Enteromorpha crinite in the form of green a...
Acrylic pressure-sensitive adhesives (PSAs) have many applications in the processes of electronic industry. As the silicon wafers become thinner, the acrylic PSAs need to show proper adhesion and better wettability on the thin wafer. The acrylic copolymers were synthesized by solution polymerization of 2-ethylhexyl acrylate, ethyl acrylate, and acr...
Photo-crosslinkable acrylic copolymer pressure-sensitive adhesives (PSAs) have many applications in the process of electronic industry. As the silicon wafers become thinner, PSAs need to show proper adhesion performance and better debonding characteristics. The acrylic copolymers were prepared with 2-ethylhexyl acrylate, ethyl acrylate, and acrylic...
Ultra violet (UV) curable pressure sensitive adhesives (PSA) were prepared by controlling both the structure of acryl copolymer and the functionality and content of multi-functional monomers. Acryl copolymer worked as the base polymer for giving the tackiness. Multi-functional monomers were used to vary the crosslinked structure and the degree of c...
UV-curable acrylic pressure-sensitive adhesives (acrylic PSAs) have many applications in industry. As the Si-wafers become thinner, the acrylic PSAs for MCP need to show proper adhesion and leave little residue on the Si-wafer after UV irradiation when released from the dicing tapes. Strong adhesion is required in the dicing process to hold the Si-...
As the refractive index of the prism layer becomes higher, the optical performance of the prism sheet gets better and the efficiency of the LCD backlight unit is improved. In order to increase the refractive index of the prism layer, the ultraviolet curing type resins were prepared by mixing high refractive index materials containing aromatic group...
Gastric cancer has the highest incidence rate among cancers in Asia. The advanced type of signet ring cell carcinoma has poor prognosis compared to other types of gastric cancer. The immuno-gene therapy with cytokine-based tumor vaccines has not yet been investigated for gastric cancer. The granulocyte macrophage colony-stimulating factor (GM-CSF)-...
Environmentally friendly biocomposites were made using plant-based natural fibers, such as henequen and kenaf. The natural fiber reinforced polypropylene (PP) and unsaturated polyester (UP) biocomposites were examined in terms of the reinforcing effect of natural fibers on thermoplastic and thermosetting polymers. Kenaf (KE) and henequen (HQ) fiber...
Thermal and dynamic mechanical properties of kenaf natural fiber reinforced polypropylene (PP) biocomposites were examined to compare the effects of natural fiber treatment by electron beam irradiation (EBI) and alkalization. The alpha cellulose contents, the functional groups on the surfaces and the thermal stability of the untreated and treated k...
Henequen natural fiber reinforced unsaturated polyester biocomposites were fabricated and characterized. Henequen fibers were treated with various electron beam irradiation (EBI) dose or different concentrations of alkali solution. The effects of EBI or alkali treatments on the both henequen fiber and the properties of biocomposites made of unsatur...
Copper electrochemical deposition on titanium with a ruthenium seed layer was investigated. The chemicals for the acid-bath ruthenium electrochemical deposition were ruthenium(III) chloride hydrate (RuCl3·3H2O), hydrochloric acid (HCl), sulfamic acid (NH2SO3H), and polyethylene glycol. The chemicals for the acid-bath copper electrochemical depositi...
Immobilization of avidin was carried out by functionalizing the multi-wall carbon nanotubes (MWCNTs). Treatment with nitric acid and sulfuric acid mixture (1:3, optimized ratio) leads to the functionalization of nanotubes as observed from Fourier transform infrared absorption spectroscopy (FTIR) measurements. Avidin was coupled with the solution of...
Electroless Cu was investigated on refractory metal, W and TaNX, and Ir noble metal substrates with a plasma-assisted atomic layer deposited palladium layer for the potential back-end-of-the-line (BEOL) metallization of advanced integrated devices. The sodium and potassium-free Cu electroless bath consisted of: ethylenediamine tetraacetic acid (EDT...
Electrochemical deposition of ruthenium as a seed layer was investigated on Ti and TiN as barrier layers for Cu interconnects. The aqueous electrolyte, the N-bridged complex of ruthenium(IV) nitrosyl chloride (RuNC), for ruthenium electrochemical deposition was formed in situ. Electrochemical deposition of copper on the Ru seeded barrier layers was...
Diamond films on the p-type Si(111) and p-type(100) substrates were prepared by microwave plasma chemical vapor deposition
(MWCVD) and hot-filament chemical vapor deposition (HFCVD) by using a mixture of methane CH4 and hydrogen H2 as gas feed. The structure and composition of the films have been investigated by X-ray Diffraction, Raman Spectroscop...
The microstructure of Sn-37Pb and Sn-8Zn-3Bi solders and the full strength of these solders with an Au/Ni/Cu pad under isothermal aging conditions were investigated. The full strengths tended to decrease as the aging temperature and time increased, regardless of the properties of the solders. The Sn-8Zn-3Bi had higher full strength than Sn-37Pb. In...
We developed a new phagemid system for the generation of combinatorial antibody libraries. This system allows the recombination efficiency to be estimated easily, which aids the accurate measurement of the antibody library size. Two phagemids were constructed. pRTCB bears the structural tetracycline-resistant gene (tetR) and pRTCA bears its promote...
We applied a ribosome display technique to a mouse scFv library to select single chain variable fragments (scFvs) specific for the terminal protein (TP) of hepatitis B virus (HBV) DNA polymerase. Synthetic TP-peptide was used as an antigen to obtain scFvs that recognize specific epitopes within the TP domain, the priming site of HBV DNA polymerase....
We previously cloned an antigenic gene (named nfa1) from a cDNA library of Naegleria fowleri by immunoscreening. The nfa1 gene had a coding nucleotide sequence consisting of 357 bases and produced a recombinant 13.1-kDa protein (Nfa1). In this
study, to get more information regarding the recombinant Nfa1 protein (rNfa1), we produced an anti-Nfa1 po...
Diversity in phage antibody libraries is important for obtaining useful high-affinity antibodies. The Cre-lox system is generally employed to increase the size of phage antibody libraries. However, estimation of library sizes after Cre-mediated recombination is difficult, since time-consuming nucleotide sequence analyses are required. We have devel...
Tumor necrosis factor-related apoptosis-inducing ligand (TRAIL) has been shown to exert potent cytotoxic activity against many tumor cells but not normal cells. However, some tumor cells are resistant to TRAIL, and it has not been determined how this occurs. In the present study, we obtained three subgroups of Jurkat clones with TRAIL-sensitive, -p...
Intracellular antibody specific to hepatitis B virus X protein (HBx) might be useful for studying the role of HBx in hepatocellular carcinogenesis and HBV replication.
One of the important factors in the prognosis of chronic hepatitis B patient is the degree of replication of hepatitis B virus (HBV). It has been known that HBV DNA polymerase plays the essential role in the replication of HBV. HBV DNA polymerase is composed of four domains, TP (Terminal protein), spacer, RT (Reverse transcriptase) and RNaseH. Amon...
Phage display is the most widely used technique among display methods to produce monoclonal antibody fragment with a specific binding activity. Having a large library for efficient antibody display/selection is quite laborious process to have more than 109 members of transformants. To overcome these limitations, several in vitro selection approache...
An antigen-related gene was cloned from a cDNA expression library of Naegleria fowleri by immunoscreening with sera obtained from mice that were either immunized with an amoebic lysate or infected with trophozoites. The coding nucleotide sequence of the cloned gene consisted of 357 bases that were translated into 119 amino acids. This gene was desi...
To determine whether pathogenic Acanthamoeba culbertsoni trophozoites and lysate can induce cytopathic changes in primary-culture microglial cells, morphological changes were observed by transmission electron microscopy (TEM). In addition, the secretion of two kinds of cytokines, tumor necrosis factor alpha (TNF-alpha) and interleukin-1beta (IL-1be...
In order to observe the cytotoxicity of Acanthamoeba spp., which were isolated from contact lens containers as ethiological agents for the probable amoebic keratitis in Korea, the crystal violet staining method and LDH release assay were carried out. In the crystal violet staining method, among eight contact lens container isolates, isolate 3 (Acan...
To determine whether trophozoites and lysates of pathogenicAcanthamoeba spp. induce apoptosis in primary-culture microglial cells, transmission electron microscopic (TEM) examinations, assessment
of DNA fragmentation by agarose gel electrophoresis, and the TdT-mediated dUTP nick-end labeling assay were performed. When
a trophozoite of pathogenic Ac...
The hepatis B virus X protein (HBx) has been thought to be implicated in the development of hepatocellular carcinoma. Although many functions of HBx have been reported, it is not clear which of HBx functions is important in hepatocellular carcinogenesis. To study HBx function, we produced a monoclonal anti-HBx Ab secreted by hybridoma cell clone H7...
We have developed a centrifugal blood pump with thick impeller blades (60% of pitch) to obtain a small tip clearance. An unshrouded impeller with 6 backward curved thick blades was used to reduce the dead zone between the shroud and upper casing. A streamline angle in volute was uniform in circumferential direction by continuity and angular momentu...
We examined dopaminergic neurons in the guinea pig retina; antisera against tyrosine hydroxylase (TH), dopamine beta-hydroxylase (DBH), phenylethanolamine N-methyltransferase (PNMT) and an antiserum against gamma-aminobutyric acid (GABA) were used. In the present study, two types of amacrine cells were labeled with an anti-TH antiserum. However, no...
Immunocytochemical methods with an antiserum against neuronal nitric oxide synthase (NOS) were applied to identify the morphology and synaptic connectivity of NOS-like immunoreactive neurons in the guinea pig retina. In the present study, two types of amacrine cells were labeled with anti-NOS antisera. Type 1 cells had large somata located in the i...
Citations
... Their unique properties are also being utilized in the aerospace sector, such as with morphing concepts [10,11], vibration dampers, release mechanisms, etc. SMAs have a considerable amount of recoverable strains. This spiked interest in the research community to use SMAs with soft elastomer and bio-inspired materials, which contribute to better flexibility when compared with conventional actuators [12]. There have been many developments pertaining to the use of SMA in robotics. ...
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... Cafe 2 1 Santinato et al. (2016); Aristizábal et al. (2000) Raspberry 2 1 Patzlaff (1971), Patzlaff (1972) Berries Blueberry 2 1 Richard (1982), 2 Navas et al. (2023) Grape 1,3 1 Shaulis et al. (1966); Shepardson et al. (1969); Studer and Olmo (1969); Pezzi and Caprara (2009) 2Application of a mechanical force directly onto the fruit or its peduncle. 3Direct mechanical motion or an alternative cutting approach implemented directly on the stem. ...
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... A robotic hand using SMA springs was developed [99] and by actuating the SMA springs, the fingers can bend or open. The soft robotic hand designed [100] using shape memory alloy (SMA) and woven type smart soft composite (SSC), used 7 DOF in total. Additionally, 11 woven SSC actuators are integrated with soft material as the united structure. ...
... It adapts to software and hardware, adapts to function, reliability, cost and capacity. This is a special purpose computer system that can be adapted to applications related to power consumption strictly required [13]. It can realize the control, monitoring, management, and other functions of other equipment. ...
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... Material experiments have been conducted for desired morphing shapes, such as laser processing [12], heat treatments [13], and "pre-training" [14]. Innovative designs of active jet engine chevrons [11,15] and smart morphing wings [16][17][18] have also been proposed. ...
... Previous studies have demonstrated that the introduction of rigid structures, such as the naphthyl group, into the molecular chains can effectively enhance thermal stability [9,[18][19][20]. The UV-curable, acrylic pressure-sensitive adhesives (PSAs) possess a cross-linked network structure comprising acrylic polymer links and a curing-agent component [21]. The adhesive properties of the acrylic component are closely associated with its flexibility. ...
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... Various SMPs are used in cancer treatments. An automated head-and-neck immobilizer that can be used during radiotherapy and evaluated the positioning reproducibility in a phantom experiment [103] is an important determinant of the success of radiotherapy. Studies have been completed for applications such as magnetic resonance imaging contrast agents and hyperthermia procedures for cancer treatment [65,104,105]. ...
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... The peel strength exhibited a similar behavior to the tack, indicating that the mobility of the polymeric molecules in acrylic PSAs played a significant role in determining the peel strength. Several studies investigated the correlation between increasing PSA cross-linking levels and peel strength [32][33][34][35]. During the peel strength test, the critical features of the PSAs resulted in interfacial failure, influenced by the structure and cross-linking of the copolymer. ...
... Acrylic PSAs are commonly employed in various industrial products, including mounting tapes, packing tapes, labels, and protective films [5]. One specific application of PSAs involves their use as a protective coating for electronic chemical materials [6][7][8]. The protective PSA film serves to safeguard the electronic components from external factors. ...
... After UV curing, this PSA network is interpenetrated with another polymer network formed by photo-polymerization of reactive multifunctional acrylate monomer (or oligomer). The residual adhesive can also be greatly reduced, and the peel performance is easy to control [21][22][23][24][25][26][27]. ...
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