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Kim, Seunghwan,Amjadi, Morteza,Lee, Tae-Ik,Jeong, Yongrok,Kwon, Donguk,Kim, Min Seong,Kim, Kyuyoung,Kim, Taek-Soo,Oh, Yong Suk,Park, Inkyu American Chemical Society 2019 ACS APPLIED MATERIALS & INTERFACES Vol.11 No.26
<P>Flexible and wearable pressure sensors have attracted a tremendous amount of attention due to their wider applications in human interfaces and healthcare monitoring. However, achieving accurate pressure detection and stability against external stimuli (in particular, bending deformation) over a wide range of pressures from tactile to body weight levels is a great challenge. Here, we introduce an ultrawide-range, bending-insensitive, and flexible pressure sensor based on a carbon nanotube (CNT) network-coated thin porous elastomer sponge for use in human interface devices. The integration of the CNT networks into three-dimensional microporous elastomers provides high deformability and a large change in contact between the conductive CNT networks due to the presence of micropores, thereby improving the sensitivity compared with that obtained using CNT-embedded solid elastomers. As electrical pathways are continuously generated up to high compressive strain (∼80%), the pressure sensor shows an ultrawide pressure sensing range (10 Pa to 1.2 MPa) while maintaining favorable sensitivity (0.01-0.02 kPa<SUP>-1</SUP>) and linearity (<I>R</I><SUP>2</SUP> ∼ 0.98). Also, the pressure sensor exhibits excellent electromechanical stability and insensitivity to bending-induced deformations. Finally, we demonstrate that the pressure sensor can be applied in a flexible piano pad as an entertainment human interface device and a flexible foot insole as a wearable healthcare and gait monitoring device.</P> [FIG OMISSION]</BR>
Kim, Yonggyoo,Kim, Sangil,Lee, Inkyu,Jeong, Jichai IEEE 2004 IEEE journal of selected topics in quantum electro Vol.10 No.2
We analyze the transmission performance of vestigial sideband (VSB) signals with electrical dispersion compensator (EDC) by numerical simulations. Optimizing the dispersion and bandwidth of EDC, and the extinction ratio and chirp of the modulator, we can improve the dispersion tolerance of VSB signals. VSB signals with negative chirp have better transmission performance while VSB signals with positive chirp are advantageous to the implementation of EDC due to low optimum dispersion in EDC. VSB transmission with EDC can be a very cost-effective solution for 10-Gb/s single-channel systems with the maximum transmission distance of 320 km.
Kim, Kyuyoung,Park, Jaeho,Suh, Ji-hoon,Kim, Minseong,Jeong, Yongrok,Park, Inkyu Elsevier 2017 Sensors and actuators. A Physical Vol.263 No.-
<P><B>Abstract</B></P> <P>We developed a new method to directly fabricate 3D multiaxial force sensor using fused deposition modeling (FDM) 3D printing of functionalized nanocomposite filaments. Here, 3D cubic cross shaped force sensor is suggested to measure the forces from three axes (x, y and z). The sensor has two components – a structural part and a sensing part – both of which are concurrently fabricated by 3D printing with different functional filaments. The structural part is printed with thermoplastic polyurethane (TPU) filament and the sensing part is printed with carbon nanotube (CNT)/TPU nanocomposite filament with a piezoresistivity on the surface of the structural part. The resistances of the sensing part are measured in three axial directions; R<SUB>x</SUB>, R<SUB>y</SUB>, and R<SUB>z</SUB> and the force applied on each axis is measured by the resistance change. The 3D-printed multiaxial force sensor could detect the sub-millimeter scale deflection and its corresponding force on each axis. According to the sensing principle, when F<SUB>z</SUB> =4N was applied, R<SUB>z</SUB> was decreased by 2% while only 0.2% resistance change of R<SUB>y</SUB> was induced. In addition, a simultaneous resistance measurement system was developed for a real-time force sensing in three axes. With its customizability, rapid manufacturing, and economic feasibility, this manufacturing approach allows direct fabrication of multiaxial sensors without additional assembly or integration processes.</P> <P><B>Highlights</B></P> <P> <UL> <LI> FDM 3D printing of carbon nanotube/thermoplastic polyurethane nanocomposite. </LI> <LI> Monolithic manufacturing process of multiaxial force sensors (Fx, Fy, and Fz). </LI> <LI> 3D cross cubic structure is proposed for multiaxial force sensing. </LI> <LI> High sensitivity to small forces by using a piezoresistivity. </LI> </UL> </P>
Dissection of Korean landrace chamoe (Cucumis melo var. makuwa) genome
Inkyu Park,Jae-Pil Choi,Jungeun Kim,Jeongyeo Lee,Soohwan Lim,Mi-Ye Lee,Hey-Ran Kim 한국육종학회 2015 한국육종학회 심포지엄 Vol.2015 No.07
The oriental melon (C. melo var. makuwa), called ‘Chamoe’ in Korean, is a popular fruit crop cultivated mainly in Asia and a high–market value crop in Korea. To provide a genomic resource as a reference genome for the Cucurbitaceae crop improvement, we performed whole genome sequencing of Korean landrace, Gotgam chamoe. We used Illumina HiSeq2000 sequencing platform to generate 89 Gb (205X) of paired and mate pair sequence reads. The pre-processed reads were de novo assembled resulting in 4,764 scaffolds with a N50 scaffold length of 249kb. This assembly represented 379.8Mb which was 84.7% of the 448Mb of the whole genome. The assembled draft was predicted 26,634 genes of which 80% were predicted by known protein or C. melo unigene homology. Approximately 20% of predicted genes were hypothetical. A total of 1,885 non-coding RNA was detected including rRNA. The transposable elements were accounted for 21% (71.6Mb) of the total assembly. All the marker candidates including SSR, INDEL, SNP were mined and presented. The draft genome will provide a useful platform for genomic research and improvement for Cucurbitacea crops.
Dynamic Behaviors of Skewed Bridge with PSC Girders Wrapped by Steel Plate
Inkyu Rhee,Lee-Hyeon Kim,Hyun-Min Kim,Joo-Beom Lee 한국철도학회 2010 International Journal of Railway Vol.3 No.3
This paper attempts to extract the fundamental dynamic properties, i.e. natural frequencies, damping ratios of the 48 mlong, 20° skewed real bridge with PSC girders wrapped by a steel plate. The forced vibration test is achieved by mounting 12 ㎐-capacity of artificial oscillator on the top of bridge deck. The acceleration histories at the 9 different locations of deck surface are recorded using accelerometors. From this full-scaled vibration test, the two possible resonance frequencies are detected at 2.38 ㎐ and 9.86 ㎐ of the skewed bridge deck by sweeping a beating frequency up to 12 ㎐. The absolute acceleration/energy exhibits much higher in case of higher-order twist mode, 9.86 ㎐ due to the skewness of bridge deck which leads asymmetric situation of vibration. This implies the test bridge is under swinging vertically in fundamental flexure mode while the bridge is also flickered up and down laterally at 9.86 ㎐. This is probably by asymmetric geometry of skewed deck. A detailed 3D beam-shell bridge models using finite elements are performed under a series of train loads for modal dynamic analyses. Thereby, the effect of skewness is examined to clarify the lateral flickering caused by asymmetrical geometry of bridge deck.
Mechanical and electrical properties of cement paste incorporated with pitch-based carbon fiber
Inkyu Rhee,Jin Hee Kim,Sang Hee Park,Sungho Lee,Bong Ryeul Ryu,Yoong Ahm Kim 한국탄소학회 2017 Carbon Letters Vol.23 No.-
The compressive strength and electrical resistance of pitch-based carbon fiber (CF) in cementitious materials are explored to determine the feasibility of its use as a functional material in construction. The most widely used CFs are manufactured from polyacrylonitrile (PAN-based CF). Alternatively, short CFs are obtained in an economical way using pitch as a precursor in a melt-blown process (pitch-based CF), which is cheaper and more eco-friendly method because this pitch-based CF is basically recycled from petroleum residue. In the construction field, PAN-based CFs in the form of fabric are used for rehabilitation purposes to reinforce concrete slabs and piers because of their high mechanical properties. However, studies have revealed that construction materials with pitch-based CF are not popular. This study explores the compressive strength and electrical resistances of a cement paste prism using pitch-based CF.